KR20230126806A - Apparatus for manufacturing heat resisting small-diameter steel tube by centrifugal casting - Google Patents

Abstract

An apparatus for manufacturing small-diameter heat-resistant steel tubes using centrifugal casting according to the present invention may comprise: a mold in which molten metal is injected into an inner circumferential surface and rotates centrifugally; a plurality of support rollers supporting first and second sides of the mold; a pressurizing unit that includes at least one pressure roller that is in contact with a third side, which is an upper part of the mold, and rotates together with the rotation of the mold, and presses the mold; and a mold temperature control unit that covers a portion of an outer circumferential surface of the mold and provides heat to the mold. Thus, the present invention can provide the small-diameter heat-resistant steel tube manufacturing apparatus using centrifugal casting, including the mold temperature control unit that covers a portion of the outer surface of the mold, and the pressurizing unit that pressurizes the mold in one direction to prevent vibration of the mold.

Description

Apparatus for manufacturing heat resisting small-diameter steel tube by centrifugal casting}

The present invention relates to a small-diameter heat-resistant steel tube manufacturing apparatus using centrifugal casting, and more particularly, to a heat-resistant steel tube manufacturing apparatus using centrifugal casting for manufacturing a small-diameter heat-resistant steel tube having a small diameter.

Heat-resistant steel tubes, which are generally used in oil refineries and petrochemical plants, are a key component of heating furnaces, and heat the fluid by conducting heat supplied from a burner to the fluid inside the heat-resistant steel tube to improve the physical and chemical properties of the fluid. It is used for change purposes. Illustratively, components constituting the fluid flowing inside the heat-resistant steel tube may form or break chemical bonds by supplied heat, and as the fluid flows inside the heat-resistant steel tube, petrochemical products having required properties are produced. It can be.

The heat-resistant steel tube has been manufactured by drawing or extruding, but when the inner diameter of the heat-resistant steel tube is formed to be very small compared to the outer diameter, the thickness between the outer and inner circumferences of the heat-resistant steel tube is thick. In addition to being difficult to manufacture, when the heat-resistant steel tube is manufactured by the drawing or compression method, there is a problem in that the heat-resistant steel tube shrinks as the outer and inner circumferential surfaces of the heat-resistant steel tube solidify toward the center of the product. A heat-resistant steel tube manufacturing apparatus using centrifugal casting has been developed.

A heat-resistant steel tube manufacturing apparatus using centrifugal casting according to the prior art can manufacture a heat-resistant steel tube by injecting molten metal into a horizontally long cylindrical mold using an injection basin and rotating the mold. More specifically, in the apparatus for manufacturing a heat-resistant steel tube using centrifugal casting, when a worker pours molten metal contained in a ladle drawn from a melting furnace into the pouring basin while rotating the mold at a predetermined speed, the molten metal is poured into the pouring basin at a slope inside the pouring basin. The molten metal flows along the flow path and is injected into the mold through an injection port formed at one end of the mold, and the molten metal introduced into the mold is moved to the inner circumferential surface of the mold by the centrifugal force of the mold to change the shape of the heat-resistant steel tube. It is cooled while being equipped to produce the heat-resistant steel tube.

However, as the molten metal comes into contact with external air from the moment it comes out of the melting furnace and starts cooling, the fluidity decreases. In the prior art, due to the low fluidity of the molten metal, the molten metal moves from one end inside the mold to the other end. It is not spread evenly, so there is a problem that the thickness of one end and the other end of the manufactured heat-resistant steel tube is different from each other, and in order to make the thickness of the heat-resistant steel tube uniform, the length of the heat-resistant steel tube must eventually be manufactured short. There was a problem.

Practically, the length of the heat-resistant steel tube manufactured according to the prior art is only 2 m, so that when a 12-m heat-resistant steel tube is required, six 2-m heat-resistant steel tubes must be welded and used. At a welded portion where heat-resistant steel tubes are welded, there is a possibility that the characteristics of the heat-resistant steel tube may change, and stability of an assembly manufactured by welding and assembling heat-resistant steel tubes may deteriorate as the welded portion of the heat-resistant steel tube increases. Therefore, when centrifugally casting one heat-resistant steel tube, it is advantageous to cast a product having a long length (eg, 3 m) in the axial direction.

In addition, in the prior art, in order to heat the temperature of the mold to a target temperature for centrifugal casting, a worker manually heated the mold using a torch. In such a mold heating method, the mold cannot be uniformly heated, and the quality of a heat-resistant steel tube cast through an unevenly heated mold may deteriorate.

In addition, in the process of centrifugal casting of the heat-resistant steel tube, the mold generally receives force in the direction of gravity due to its own weight. However, despite its own weight, the mold can vibrate radially while rotating in one direction. Illustratively, the mold may vibrate in a vertical direction, and the process of cooling the molten metal rotating inside the mold may be affected by the vibration of the mold. Accordingly, the quality of the cast heat-resistant steel tube may deteriorate.

10-1109884 B1

In order to solve the above problems, the present invention is a small-diameter heat-resistant steel using centrifugal casting including a mold temperature control unit covering a part of the outer surface of the mold and a pressurizing unit that presses the mold in one direction to prevent vibration of the mold. A tube manufacturing apparatus is provided.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

In order to achieve the above object, an apparatus for manufacturing a small-diameter heat-resistant steel tube using centrifugal casting according to the present invention includes a mold in which molten metal is injected into an inner circumferential surface to rotate centrifugally, and a first side and a second side of the mold are supported. a plurality of support rollers, a pressure unit including at least one pressure roller that rotates along with the rotation of the mold by contacting a portion of the outer circumferential surface with a third side, which is an upper portion of the mold, and pressurizing the mold; and the mold It covers a part of the outer circumferential surface of the mold and includes a mold temperature control unit providing heat to the mold.

In addition, the plurality of support rollers include a plurality of first support rollers supporting the first side of the mold and a plurality of second support rollers supporting the second side of the mold, and the plurality of At least one of the first support rollers and the plurality of second support rollers rotates in one direction by receiving a driving force.

In addition, a first radial support force in which the first support rollers radially support the mold, a second radial support force in which the second support rollers support the mold in a radial direction, and a pressure roller support the mold in a radial direction. The resultant force of the pressing force pressing in the radial direction is perpendicular to the ground.

Also, the pressure roller is disposed at the axial center of the mold.

In addition, the pressure unit may include a first pressure roller disposed in the axial center of the mold on the third side, which is an upper portion of the mold, spaced apart from the first pressure roller by a predetermined distance in a first direction, and the third side It includes a second pressure roller disposed on, and a third pressure roller disposed on the third side spaced apart from the first pressure roller by a predetermined distance in a direction opposite to the first direction.

In addition, the pressing unit is formed parallel to the axial direction of the mold, and rotates in one direction to contact or separate the pressing roller from the outer circumferential surface of the mold, and the pressing unit hinge is formed extending from the outer surface of the hinge and a pressure unit hinge extension portion connecting the rotation center of the pressure roller and the pressure unit hinge.

In addition, the pressing unit hinge extension portion is formed in an arch shape having a predetermined radius of curvature.

In addition, the mold temperature control unit includes a mold cover that covers a part of the outer circumferential surface of the mold and is spaced apart from the outer circumferential surface of the mold by a predetermined distance, and the mold cover has the pressure roller on the third side of the mold. and at least one cover slit for accommodating at least a portion of the pressure roller in contact, wherein the thickness of the cover slit is greater than the thickness of the pressure roller.

In addition, the mold temperature control unit further includes a plurality of heating nozzles arranged in a direction parallel to the rotational axis of the mold and directing the mold to the inner circumferential surface of the mold cover, the plurality of heating nozzles are disposed at one end of the mold cover. The mold is heated through a combustion source supplied through a combustion source supply unit formed in the.

In addition, the mold temperature control unit further includes a plurality of cooling nozzles spaced apart from the plurality of heating nozzles, oriented to the mold on the inner circumferential surface of the mold cover and arranged in a direction parallel to the rotational axis of the mold, The plurality of cooling nozzles are spaced apart from the combustion source supply unit and spray a cooling source supplied through a cooling source supply unit formed at one end of the mold cover to cool the mold.

The cooling unit may further include a plurality of upward cooling nozzles that are formed from a lower side of the mold upward to face the mold and are arranged in a direction parallel to a rotational axis of the mold.

The mold temperature control unit may further include a heating cable buried in at least a partial area of the mold cover, and the heating cable uses power supplied through a power supply unit formed at one end of the mold cover to form the mold cover. heat up

In addition, the mold temperature control unit includes a plurality of mold covers that cover a part of the outer circumferential surface of the mold and are spaced apart from the outer circumferential surface of the mold by a predetermined distance, and the distance between the mold covers is greater than the thickness of the pressure roller. Formed large, the pressure roller contacts the third side of the mold.

Also, the heights of the centers of rotation of the first support rollers may be different from the heights of the centers of rotation of the second support rollers.

By using the small-diameter heat-resistant steel tube manufacturing apparatus using centrifugal casting according to the present invention, there is an advantage in that the quality of the small-diameter heat-resistant steel tube manufactured by minimizing vertical vibration of the mold can be improved.

In addition, by using the small-diameter heat-resistant steel tube manufacturing apparatus using centrifugal casting according to the present invention, the temperature drop of the mold during heating of the mold can be minimized and the mold can be cooled quickly, thereby improving the productivity of the small-diameter heat-resistant steel tube. There are advantages to doing so.

1 is a schematic diagram schematically showing an apparatus for manufacturing a small-diameter heat-resistant steel tube using centrifugal casting according to an embodiment of the present invention.
Figure 2 is a longitudinal cross-sectional view of Figure 1;
3 is for explaining the correlation between the pressure roller, the support rollers, and the mold.
4 is a schematic diagram schematically showing an apparatus for manufacturing a small-diameter heat-resistant steel tube using centrifugal casting according to another embodiment of the present invention.
5 is a longitudinal cross-sectional view of a small-diameter heat-resistant steel tube manufacturing apparatus using centrifugal casting according to another embodiment of the present invention or another embodiment of the present invention.
6 is a schematic diagram schematically showing an apparatus for manufacturing a small-diameter heat-resistant steel tube using centrifugal casting according to a fourth embodiment of the present invention.
7 is a longitudinal cross-sectional view of a small-diameter heat-resistant steel tube manufacturing apparatus using centrifugal casting according to a fifth embodiment of the present invention.
8 is a schematic block diagram illustrating a centrifugal casting process including temperature sensing, mold heating, and mold cooling of a small-diameter heat-resistant steel tube manufacturing apparatus using centrifugal casting according to various embodiments of the present invention.
9 is a schematic flowchart of a method for manufacturing a small-diameter heat-resistant steel tube of a small-diameter heat-resistant steel tube manufacturing apparatus using centrifugal casting according to various embodiments of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to components of each drawing, it should be noted that the same components have the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing an embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function hinders understanding of the embodiment of the present invention, the detailed description will be omitted.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, order, or order of the corresponding component is not limited by the term. In addition, unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

Meanwhile, the small-diameter heat-resistant steel tube described in the present invention may mean a heat-resistant steel tube having a relatively small outer diameter, and the small-diameter heat-resistant steel tube may exemplarily be a heat-resistant steel tube having a diameter of 55φ or less.

1 is a schematic diagram schematically showing a small-diameter heat-resistant steel tube manufacturing apparatus 1 using centrifugal casting according to an embodiment of the present invention, and FIG. 2 is a longitudinal cross-sectional view of FIG.

Referring to FIGS. 1 and 2 , an apparatus 1 for manufacturing a small-diameter heat-resistant steel tube using centrifugal casting according to an embodiment of the present invention includes a mold 100, a plurality of support rollers 200, and a pressing unit 300 , and a mold temperature control unit 400 .

The mold 100 may be formed in a cylindrical shape. The mold 100 may be disposed elongated horizontally (eg, in a direction parallel to the y-axis). The mold 100 may be rotatable in the circumferential direction. The mold 100 may be rotatably disposed about a virtual horizontal axis passing through the center of the radial direction of the mold 100 in the axial direction as a rotation center. A cavity, which is a space into which molten metal is injected, may be formed inside the mold 100 . The inner circumferential surface of the mold 100 may be a surface surrounding the cavity. Illustratively, the mold 100 may have a hollow structure, and a heat-resistant steel tube may be manufactured by injecting molten metal into an inner circumferential surface of the mold 100 and rotating the mold 100 centrifugally.

The mold 100 may include one end of the mold 101 into which molten metal is injected and another end of the mold 102 formed at a position opposite to the one end of the mold 101 . At one end of the mold 101, application of the release agent by the release agent applicator and injection of molten metal by the automatic injector of molten metal can be performed, and at the other end of the mold 102, the cast small-diameter heat-resistant steel tube is taken out by centrifugal rotation of the mold 100. this can be done

Although not shown in detail in the present invention, the mold 100 can move in the axial direction while rotating in one direction by the support rollers 200 described later, and the mold 100 escapes the support rollers 200 while rotating. Failure to do so may damage the small-diameter heat-resistant steel tube manufacturing equipment or threaten the safety of workers. Accordingly, a pair of guide rings that can contact the front or rear surfaces of the support rollers 200 may be formed on the outer circumferential surface of the mold 100 . The guide ring interferes with the support rollers 200 when the mold 100 moves in the axial direction, so that the mold 100 does not move in the axial direction more than a predetermined distance. Although the guide ring structure is not shown in the accompanying drawings of the present invention, it should be understood that the guide ring structure is applied to prevent the mold 100 from moving away in the axial direction.

Hereinafter, the plurality of support rollers 200 will be described.

3 is for explaining the relationship between the pressure roller 330, the support rollers 200, and the mold 100. 3 , in order to explain the relationship between the pressure roller 330, the support rollers 200, and the mold 100, the mold temperature control unit 400 and some components of the pressure unit 300 are omitted.

Referring to FIGS. 1 to 3 , an apparatus 1 for manufacturing a small-diameter heat-resistant steel tube using centrifugal casting according to an embodiment of the present invention includes a plurality of support rollers 200 . A plurality of support rollers 200 may support the lower side of the mold 100 . More specifically, the plurality of support rollers 200 may support the first side of the mold 100, which is the lower side of the mold 100, and the second side of the mold 100. In this case, the lower side of the mold 100 may refer to an outer side of the mold 100 located below a horizontal line passing through the mold rotation center 100C in a state in which the mold 100 is stopped. Illustratively, the plurality of support rollers 200 include a plurality of first support rollers 210 and 230 supporting the first side of the mold 100 and a plurality of supporting rollers 210 and 230 supporting the second side of the mold 100. Of the second support rollers (220, 240) may include. More specifically, the first support rollers 210 and 230 include a front first support roller 210 disposed on one end of the mold 101 and a rear first support roller 230 disposed on the other end 102 of the mold. ), and the second support rollers 220 and 240 include a front second support roller 220 disposed at one end of the mold 101 and a second rear support roller disposed at the other end 102 of the mold. (240). The front support rollers 210 and 220 and the rear support rollers 230 and 240 may be spaced apart from each other by a predetermined distance. The front support rollers 210 and 220 and the rear support rollers 230 and 240 are spaced apart from each other so as to have a distance capable of stably supporting the mold 100 . Meanwhile, the plurality of first support rollers 210 and 230 are described as two, and the plurality of second support rollers 220 and 240 are also described as two, but are not necessarily limited to the described number. Illustratively, the plurality of first support rollers may be three or more, and the plurality of second support rollers may also be three or more. However, for stable support of the small-diameter heat-resistant steel tube manufacturing apparatus 1 using centrifugal casting, the number of first support rollers and the number of second support rollers may be the same.

At least one of the plurality of first support rollers 210 and 230 and the plurality of second support rollers 220 and 240 may be supplied with a driving force from a centrifugal actuator to rotate in one direction. The centrifugal drive may be a drive motor. Illustratively, the plurality of first support rollers 210 and 230 may rotate in one direction by receiving driving force from a centrifugal driver. In this case, the plurality of first support rollers 210 and 230 may be connected to the rotating shaft of the centrifugal actuator through a belt pulley. However, the connection method between the rotating shaft of the centrifugal actuator and the first support rollers 210 and 230 is not limited to the belt pulley. Meanwhile, in order for the first support rollers 210 and 230 to function as driving rollers by the centrifugal driver, the front first support roller 210 and the rear first support roller 230 are provided with a first support roller shaft (not shown). ) and can rotate together.

When the plurality of first support rollers 210 and 230 receive driving force from the centrifugal actuator and rotate, the plurality of second support rollers 220 and 240 function as free rollers. That is, when the plurality of first support rollers 210 and 230 operate as driving rollers, the plurality of second support rollers 220 and 240 operate as driven rollers. Conversely, when the plurality of first support rollers 220 and 240 operate as driving rollers, the plurality of first support rollers 210 and 230 operate as driven rollers.

Hereinafter, the pressure unit 300 including the pressure roller 330 will be described in detail.

A small-diameter heat-resistant steel tube manufacturing apparatus 1 using centrifugal casting according to an embodiment of the present invention includes a pressurizing unit 300 for pressurizing a mold 100. The pressing unit 300 may press the mold 100 in a downward direction (direction toward the ground) from a third side different from the first and second sides of the mold 100 . More specifically, the press unit 300 may include a press unit hinge 310 . The press unit hinge 310 may be formed parallel to the axial direction of the mold. Also, the pressure unit hinge 310 may rotate in one direction. Illustratively, the pressing unit hinge 310 may rotate counterclockwise with respect to the XZ plane to pressurize the mold 100, and rotate clockwise to release the pressurization of the mold 100.

In addition, the pressurization unit 300 includes a pressurization unit hinge extension part 320 extending from the outer surface of the pressurization unit hinge 310 . The press unit hinge extension 320 may be formed in an arch shape having a predetermined radius of curvature, and vertical vibration of the mold 100 may be easily prevented by the arch shape of the press unit hinge extension 320. . However, the press unit hinge extension 320 does not necessarily have to be formed in an arch shape, and may have a shape other than an arch shape such as a straight bar shape.

In addition, the pressure unit 300 includes at least one pressure roller 330 . Illustratively, a part of the outer circumferential surface of the pressure roller 330 may come into contact with the third side, which is the upper part of the mold 100, to rotate together with the centrifugal rotation of the mold 100. More specifically, the rotation center of the pressure roller 330 may be connected to the pressure unit hinge 310 by the pressure unit hinge extension 320 . Accordingly, as the pressure unit hinge 310 rotates in one direction or the other direction, a portion of the outer circumferential surface of the pressure roller 330 may contact or be spaced apart from the third outer circumferential surface of the mold 100 . Illustratively, when the pressure unit hinge 310 rotates counterclockwise with respect to the XZ plane, the pressure roller 330 may come into pressure contact with the third outer peripheral surface of the mold 100 . In addition, when the pressure unit hinge 310 rotates clockwise with respect to the XZ plane, the pressure roller 330 may be spaced apart from the third side of the outer circumferential surface of the mold 100 . In this way, the pressing unit 300 may press the upper part of the mold 100 by the pressing roller 330, and vibration of the mold 100 in a vertical direction may be minimized.

Meanwhile, at least one pressure roller 330 may be included. Illustratively, the pressure unit 300 may include one pressure roller 330 . The pressure roller 330 may be disposed at the center of the mold 100 in the axial direction. More specifically, when the axial length of the mold 100 is L, the pressure roller 330 may be disposed at the axial center of the mold 100 at a distance of 0.5L from the mold end 101. Accordingly, the support rollers 200 and the pressure roller 330 described above can stably support and press the mold 100 .

As another example, the pressure unit 300 may include a plurality of pressure rollers 331 , 332 , and 333 . More specifically, the pressure unit 300 may include a first pressure roller 331 , a second pressure roller 332 , and a third pressure roller 333 . The first pressure roller 331 may be disposed to press the third side, which is the upper part of the mold 100, at the center of the mold 100 in the axial direction. The second pressure roller 332 may be spaced apart from the first pressure roller 331 by a predetermined distance in a first direction (eg, a positive y-axis direction parallel to the axial direction of the mold 100). In this case, the second pressure roller 332 may be spaced apart from the first pressure roller 331 by a first separation distance D1. The second pressure roller 332 is also arranged to press the third side of the mold 100 . The third pressure roller 333 is spaced apart from the first pressure roller 331 by a predetermined distance in a direction opposite to the first direction (eg, a negative y-axis direction parallel to the axial direction of the mold 100). can In this case, the third pressure roller 333 may be spaced apart from the first pressure roller 331 by a second separation distance D2. A third pressure roller 333 is also arranged to press the third side of the mold 100 . Meanwhile, the first separation distance D1 and the second separation distance D2 may be the same. When the first separation distance D1 and the second separation distance D2 are the same, the plurality of pressure rollers 331, 332, and 333 are symmetrically disposed with respect to the first pressure roller 331, so that the mold 100 It has the advantage of being able to press more uniformly.

Meanwhile, the first pressure roller 331 is connected to the pressure unit hinge 310 by a pair of first pressure unit hinge extensions 320a and 320b, and the second pressure roller 332 is connected to the pair of second pressure unit hinge extensions 320a and 320b. It is connected to the pressure unit hinge 310 by the pressure unit hinge extensions 320c and 320d, and the third pressure roller 333 is connected to the pressure unit hinge by a pair of third pressure unit hinge extensions 320e and 320f. (310) can be connected.

However, the number of pressure rollers 330 is not limited to one or three, and an appropriate number may be selected and applied as needed. Meanwhile, when the number of pressure rollers 330 is even, the pressure rollers 330 may be disposed at appropriate positions to uniformly press the mold 100 from the third side.

Hereinafter, the arrangement relationship between the plurality of support rollers 200 and the pressure roller 330 will be described.

1 and 3, the support force of the first support rollers 210 and 230 supporting the mold 100, the support force of the second support rollers 220 and 240 supporting the mold 100, and The resultant force of the pressure roller 330 presses the mold 100 may be in a direction perpendicular to the ground.

Illustratively, among the first support rollers 210 and 230, the front first support roller 210 supports the first side of the mold 100 from the front first support roller rotation center 210C to the mold rotation center 100C. ) to support the mold 100 in the radial direction to generate a first radial supporting force (F1). In addition, among the second support rollers 220 and 240, the front second support roller 220 supports the second side of the mold 100 to move the mold rotation center 100C from the front second support roller rotation center 220C. A second radial supporting force F2 may be generated by supporting the mold 100 in the radial direction toward the mold 100 . In addition, the pressure roller 330 supports the third side of the mold 100 and presses the mold 100 in the radial direction from the pressure roller rotation center 330C toward the mold rotation center 100C to generate a pressure F3. can do. At this time, the resultant force (F1+F2+F3) of the first radial support force F1, the second radial support force F2, and the pressing force F3 may be perpendicular to the ground. In addition, the first radial support force (F1), the second radial support force (F2), the pressing force (F3), and the resultant force (F1+F2+F3+W) of the self-weight of the mold 100 are directed toward the ground may be perpendicular to or zero. In this way, by the resultant force of the support force of the first support rollers 210 and 230, the support force of the second support rollers 220 and 240, and the pressing force of the pressure roller 330, the mold 100 vibrates in the vertical direction. This can be prevented, and vibration that may occur when the mold 100 rotates in one direction during the centrifugal casting process can be minimized. Accordingly, the user has the advantage of being able to improve the quality of the product (that is, the small-diameter heat-resistant steel tube) manufactured using the small-diameter heat-resistant steel tube manufacturing apparatus 1 using centrifugal casting according to an embodiment of the present invention. .

Hereinafter, the mold temperature control unit 400 for heating or cooling the mold 100 will be described.

Referring to FIGS. 1 and 2 , an apparatus 1 for manufacturing a small-diameter heat-resistant steel tube using centrifugal casting according to an embodiment of the present invention includes a mold temperature control unit 400 . The mold temperature control unit 400 is disposed to cover a portion of the outer circumferential surface of the mold 100 to heat or cool the mold 100 . More specifically, the mold temperature control unit 400 provides heat to the mold 100 so that the mold 100 reaches a target temperature during centrifugal casting by applying a release agent to the inner circumferential surface of the mold 100 or injecting molten metal. can In addition, the mold temperature control unit 400 may cool the mold 100 so that the molten metal is quickly solidified on the inner circumferential surface of the mold 100 and taken out.

The mold temperature control unit 400 may include a mold temperature control unit hinge 410 . The mold temperature control unit hinge 410 may be formed parallel to the axial direction of the mold. In addition, the mold temperature control unit hinge 410 may rotate in one direction. Illustratively, the mold temperature control unit hinge 410 may cover a part of the outer circumferential surface of the mold 100 with the mold cover 420 by rotating clockwise with respect to the XZ plane, and rotates counterclockwise to cover the mold cover 420 may not cover a part of the outer circumferential surface of the mold 100.

In addition, the mold temperature control unit 400 includes a mold cover 420 connected to the mold temperature control unit hinge 410 and spaced apart from the outer circumferential surface of the mold 100 by a predetermined distance. The mold cover 420 may cover a portion of the outer circumferential surface of the mold 100 . More specifically, the mold cover 420 may cover the upper portion (upper semicircle) of the entire outer circumferential surface of the mold 100 . The mold cover 420 may serve as a barrier to prevent the temperature of the mold 100 from being lowered due to heat generated by the mold 100 .

In addition, the mold cover 420 includes at least one cover slit 421 . The cover slit 421 may accommodate at least a portion of the pressure roller 330 so that the pressure roller 330 contacts the third side of the mold 100 . The number of cover slits 421 corresponding to the number of pressure rollers 330 may be provided. Illustratively, when the pressure roller 330 includes a first pressure roller 331, a second pressure roller 332, and a third pressure roller 333, the cover slit 421 is a first cover slit ( 421a), a second cover slit 421b, and a third cover slit 421c.

In addition, the slit thickness S of the cover slit 421 may be greater than that of the pressure roller 330 . Since the slit thickness (S) of the cover slit 421 is formed to be larger than the thickness of the pressure roller 330, the mold cover 420 is molded in a state where the pressure roller 330 presses the third side of the mold 100. There is an advantage that it can be separated from (100). That is, there is an advantage in that the pressure unit 300 and the mold temperature control unit 400 can operate independently, and mutual operations of the pressure unit 300 and the mold temperature control unit 400 do not interfere.

Referring to FIG. 2 , the mold temperature control unit 400 further includes a plurality of heating nozzles 430 . A plurality of heating nozzles 430 are arranged to direct the mold 100 to the inner circumferential surface of the mold cover 420 . In addition, the plurality of heating nozzles 430 may be arranged at regular intervals in a direction parallel to the rotational axis of the mold 100 in order to uniformly heat the entire mold 100 . Illustratively, the plurality of heating nozzles 430 may be arranged in a line along the y-axis direction. As another example, the plurality of heating nozzles 430 may be arranged in a plurality of rows along the y-axis direction.

On the other hand, the supply unit 500 is formed at one end (more specifically, the side adjacent to the other end of the mold) of the mold cover 420, and the supply unit 500 may be connected to the inside of the mold cover 420. More specifically, the supply unit 500 may include a combustion source supply unit 510 . The combustion source supply unit 510 may supply a combustion source (eg, gas) to the plurality of heating nozzles 430 . The plurality of heating nozzles 430 may heat the mold 100 through a combustion source supplied through the combustion source supply unit 510 . More specifically, the plurality of heating nozzles 430 may burn a combustion source to inject flames toward the outer circumferential surface of the mold 100, and the plurality of heating nozzles 430 may inject flames into the mold ( 100) may be heated. In this way, the plurality of heating nozzles 430 disposed on the inner circumferential surface of the mold cover 420 heat the mold 100, so that the mold 100 can be heated uniformly and quickly. ) has the advantage of safely protecting the worker who heated it.

Meanwhile, the mold temperature control unit 430 may cool the mold 100 . Illustratively, the mold temperature control unit 430 may further include a plurality of cooling nozzles 440 . The plurality of cooling nozzles 440 may be spaced apart from the plurality of heating nozzles 430 and disposed on the inner surface of the mold cover 420 in a direction toward the mold 100 . In addition, the plurality of cooling nozzles 440 may be arranged at regular intervals in a direction parallel to the rotational axis of the mold 100 to uniformly cool the entire mold 100 . Illustratively, the plurality of cooling nozzles 440 may be arranged in a line along the y-axis direction. As another example, the plurality of cooling nozzles 440 may be arranged in a plurality of rows along the y-axis direction.

Meanwhile, a supply unit 500 and a cooling source supply unit 520 formed at one end (more specifically, a side adjacent to the other end of the mold) of the mold cover 420 may be further included. The cooling source supply unit 520 may supply a cooling source (eg, cooling water) to the plurality of cooling nozzles 440 . The plurality of cooling nozzles 440 may cool the mold 100 through a combustion source supplied through a cooling source supply unit 520 spaced apart from the combustion source supply unit 510 . More specifically, the plurality of cooling nozzles 440 may spray cooling water toward the outer circumferential surface of the mold 100, and the mold 100 may be cooled by the cooling water sprayed by the plurality of cooling nozzles 440. can As such, the plurality of cooling nozzles 440 disposed on the inner circumferential surface of the mold cover 420 cool the mold 100, thereby providing an advantage of uniformly and quickly cooling the mold 100.

In addition, since the plurality of cooling nozzles 440 are spaced apart from the plurality of heating nozzles 430 to minimize the influence between the plurality of heating nozzles 430 and the plurality of cooling nozzles 440, the heating process and cooling There is an advantage that the process can be performed safely.

Hereinafter, a small-diameter heat-resistant steel tube manufacturing apparatus 2 using centrifugal casting according to another embodiment of the present invention will be described.

4 is a schematic view schematically showing a small-diameter heat-resistant steel tube manufacturing apparatus 2 using centrifugal casting according to another embodiment of the present invention, and FIG. 5 is another embodiment of the present invention or another embodiment of the present invention. It is a longitudinal cross-sectional view of the small-diameter heat-resistant steel tube manufacturing apparatus 2 and 3 using centrifugal casting according to FIG.

4 and 5, a small-diameter heat-resistant steel tube manufacturing apparatus 2 using centrifugal casting according to another embodiment of the present invention includes the same mold 100 as the aforementioned small-diameter heat-resistant steel tube manufacturing apparatus 1, a plurality of It may include support rollers 200 and a pressure unit 300. However, the mold temperature control unit 400' included in the small-diameter heat-resistant steel tube manufacturing apparatus 2 using centrifugal casting according to another embodiment of the present invention is instead of one mold cover 420 having a cover slit 421. A plurality of mold covers 420a, 420b, 420c, and 420d may be included.

Illustratively, when one pressure roller 330 is disposed, one mold cover 420 may be provided in front and rear of the pressure roller 330, respectively (two in total). As another example, when three pressure rollers (331, 332, 333) are disposed, the mold cover 420 is one (420a) in front of the second pressure roller 332, the first pressure roller 331 and One 420b between the second pressure roller 332, one 420c between the first pressure roller 331 and the third pressure roller 333, and one 420d behind the third pressure roller 333 ) can be provided.

Meanwhile, the plurality of mold covers 420a, 420b, 420c, and 420d cover a portion of the outer circumferential surface of the mold 100 and are spaced apart from the outer circumferential surface of the mold 100 by a predetermined distance. In addition, a portion of the outer circumferential surface of the mold 100 may be exposed between the plurality of mold covers 420a, 420b, 420c, and 420d, and the pressure roller 330 may be exposed between the plurality of mold covers 420a, 420b, 420c, and 420d. ) can be in contact with the third side of the mold 100 exposed between. In order for the pressure roller 330 to stably contact the third side of the mold 100, the distance S between the plurality of mold covers 420a, 420b, 420c, 420d is greater than the thickness of the pressure roller 330. can be made large. In this way, by using the plurality of mold covers 420a, 420b, 420c, and 420d instead of the cover slit, the operator presses the fourth side of the mold 100 as needed, using a pressure roller to remove the mold 100. A pressure roller that presses the 5 side can be additionally applied to the mold 100, and various modifications can be made to improve the quality of the small-diameter heat-resistant steel tube manufactured by the small-diameter heat-resistant steel tube manufacturing apparatus 2 using centrifugal casting. There is an advantage to doing it.

Hereinafter, a small-diameter heat-resistant steel tube manufacturing apparatus 3 using centrifugal casting according to another embodiment of the present invention will be described.

Referring to FIG. 5, a small-diameter heat-resistant steel tube manufacturing apparatus 3 using centrifugal casting according to another embodiment of the present invention is the same mold as the small-diameter heat-resistant steel tube manufacturing apparatus 1 and 2 using centrifugal casting described above ( 100), a plurality of support rollers 200, and a pressure unit 300. However, the small-diameter heat-resistant steel tube manufacturing apparatus 3 using centrifugal casting according to another embodiment of the present invention may include a separate cooling unit 600 that is not formed on the inner circumferential surface of the mold cover 420 . More specifically, the cooling unit 600 is a cooling pipe 610 formed in a direction parallel to the rotational axis of the mold 100 at the lower side of the mold 100, extending from the cooling pipe 610, and forming the mold 100 ) may include a plurality of upward cooling nozzles 620 formed upwardly so as to direct the mold from the lower side. A plurality of upward cooling nozzles 620 may be arranged at regular intervals in a direction parallel to the rotation axis including the mold rotation center 100C. Illustratively, the plurality of upward cooling nozzles 620 may be arranged in a line along the y-axis direction. Bongsu's upward cooling nozzles 620 can rapidly cool the mold 100 by spraying a cooling source supplied through the cooling pipe 610 to the mold 100 . Since the cooling unit 600 is formed separately from the mold temperature control units 400 and 400', even if the mold cover 420 of the mold temperature control units 400 and 400' is completely separated from the mold 100, the mold 100 ) can be cooled. Accordingly, when the mold 100 is cooled, heat dissipation of the mold 100 can be prevented from being delayed by the mold cover 420, and manufacturing and taking out of the small-diameter heat-resistant steel tube can be accelerated, thereby increasing the productivity of the small-diameter heat-resistant steel tube. There are benefits to improving.

Hereinafter, a small-diameter heat-resistant steel tube manufacturing apparatus 4 using centrifugal casting according to a fourth embodiment of the present invention will be described.

6 is a schematic diagram schematically showing an apparatus 4 for manufacturing a small-diameter heat-resistant steel tube using centrifugal casting according to a fourth embodiment of the present invention.

Referring to FIG. 6, a small diameter heat-resistant steel tube manufacturing apparatus 4 using centrifugal casting according to a fourth embodiment of the present invention is the same as the small diameter heat-resistant steel tube manufacturing apparatus 1, 2, 3 using centrifugal casting described above. It may include a mold 100 , a plurality of roller units 200 , and a press unit 300 . However, the mold temperature control unit 400'' of the small-diameter heat-resistant steel tube manufacturing apparatus 4 using centrifugal casting according to the fourth embodiment of the present invention uses a heating cable 431 instead of a plurality of heating nozzles 430. can include Illustratively, the mold temperature control unit 400″ may include a heating cable 431 buried in at least a partial area of the mold cover 420 . The heating cable 431 may be formed of a material that generates heat when power is supplied. More specifically, the heating cable 431 can receive power through the power supply unit 511 of the supply unit 500' formed at one end of the mold cover 420, and the heating cable 431 converts electrical energy into thermal energy. can be converted to heat. Heat generated by the heating cable 431 can be transferred to the mold 100, and the mold 100 can be heated to a temperature suitable for manufacturing a small-diameter heat-resistant steel tube by centrifugally casting molten metal.

Meanwhile, the heating cable 431 may be operated in an induction heating method using a coil. When the heating cable 431 is operated in an induction heating method, the heating cable 431 can quickly generate heat at a high temperature, and the mold 100 can also be heated to a temperature suitable for manufacturing a small-diameter heat-resistant steel tube by centrifugally casting molten metal. It can heat up quickly.

Hereinafter, a small-diameter heat-resistant steel tube manufacturing apparatus 5 using centrifugal casting according to a fifth embodiment of the present invention will be described.

7 is a longitudinal cross-sectional view of a small-diameter heat-resistant steel tube manufacturing apparatus 5 using centrifugal casting according to a fifth embodiment of the present invention.

Referring to FIG. 7, the small-diameter heat-resistant steel tube manufacturing apparatus 5 using centrifugal casting according to the fifth embodiment of the present invention is the small-diameter heat-resistant steel tube manufacturing apparatus 1, 2, 3, 4 using the centrifugal casting described above. It may include the same mold 100 as. However, in the small-diameter heat-resistant steel tube manufacturing apparatus 5 using centrifugal casting according to the fifth embodiment of the present invention, the arrangement positions between the plurality of support rollers 200 may be slightly different. That is, the first support rollers 210 and 230 and the second support rollers 220 and 240 may be disposed to have different heights.

The height of the rotation center 210C of the first support rollers 210 and 230 and the height of the rotation center 220C of the second support rollers 220 and 240 may be formed to be different. Illustratively, the height of the rotation center 210C of the first support rollers 210 and 230 may be higher than the rotation center 220C of the second support rollers 220 and 240 by h. At this time, the support rollers 200 formed at a relatively low height may function as main rollers. More specifically, the first support rollers 210 and 230 may function as driven rollers, and the second support rollers 220 and 240 may function as driving rollers. In this way, when the main roller is disposed at a lower position than the driven roller, the outer circumferential surface of the mold 100 may be in close contact with the main roller. Since the outer circumferential surface of the mold 100 is in close contact with the driving roller, the transmission efficiency of the driving force transmitted to the mold 100 by the centrifugal actuator can be increased, and the power consumption efficiency for manufacturing a small diameter heat-resistant steel tube can be maximized. there is.

Meanwhile, when the height of the center of rotation 210C of the first support rollers 210 and 230 and the height of the center of rotation 220C of the second support rollers 220 and 240 are formed differently, the first support roller The first radial support force F1′ in which the s 210 and 230 support the outer circumferential surface of the mold 100 and the second support rollers 220 and 240 support the outer circumferential surface of the mold 100 in the second radial direction The pressure roller 330 may be disposed to correspond to the direction of the support force F2'. Illustratively, the pressure roller 330 may be disposed at a position biased by a predetermined angle from the uppermost side of the outer circumferential surface of the mold 100 to a direction in which a support roller serving as a driving roller is disposed to press the mold 100 . Accordingly, the resultant force (F1'+) of the first radial supporting force (F1'), the second radial supporting force (F2'), and the pressing force (F3') for which the pressure roller 330 presses the outer circumferential surface of the mold 100. F2'+F3') may have a direction perpendicular to the ground. The pressure roller 330 is disposed on an appropriate upper side of the mold 100 according to the position where the plurality of support rollers 200 are disposed, and the mold 100 can be effectively prevented from vibrating in the vertical direction or radial direction. there is.

Hereinafter, a small-diameter heat-resistant steel tube manufacturing method using the small-diameter heat-resistant steel tube manufacturing apparatuses 1, 2, 3, 4, and 5 using centrifugal casting according to various embodiments of the present invention will be described.

8 illustrates a centrifugal casting process including temperature sensing, mold heating, and mold cooling of small-diameter heat-resistant steel tube manufacturing apparatuses 1, 2, 3, 4, and 5 using centrifugal casting according to various embodiments of the present invention. Figure 9 is a schematic block diagram of a small-diameter heat-resistant steel tube manufacturing method of the small-diameter heat-resistant steel tube manufacturing apparatus (1, 2, 3, 4, 5) using centrifugal casting according to various embodiments of the present invention. am.

Referring to FIGS. 8 and 9 , a small-diameter heat-resistant steel tube manufacturing process of the small-diameter heat-resistant steel tube manufacturing apparatus 1, 2, 3, 4, and 5 using centrifugal casting according to various embodiments of the present invention will be described.

First, the temperature sensor 1100 may measure the temperature of the mold 100 . The temperature of the mold 100 may be measured in a non-contact method, but is not necessarily limited to the non-contact method. The controller 1200 may set a time to heat or cool the mold 100 according to the temperature of the mold 100 detected by the temperature sensor 1100 .

Thereafter, a first heating step (S110) may be performed. In the first heating step ( S110 ), the controller 1200 controls the centrifugal actuator 1300 so that the centrifugal actuator 1300 transmits a driving force to the plurality of support rollers 200 . The centrifugal driver 1300 transmits a driving force to a main roller among the plurality of support rollers 200, and the mold 100 may also centrifugally rotate by the rotation of the plurality of support rollers 200.

Meanwhile, the controller 1200 controls the pressure roller 330 to press the third side of the upper part of the mold through the pressure unit driver 1900 in order to minimize vertical vibration caused by the rotation of the mold 100. (300) can be controlled. In addition, the controller 1200 may control the mold temperature control unit 400 so that the mold cover 420 of the mold temperature control unit 400 covers a part of the outer circumferential surface of the mold 100 through the heating unit driver 1800. there is. In addition, the controller 1200 controls the combustion source supplier 1600 to spray flame toward the mold 100 from the plurality of heating nozzles 430 included in the mold temperature control unit 400, and the supply unit 500 A combustion source may be supplied to the plurality of heating nozzles 430 through the medium combustion source supply unit 510 . Alternatively, in the controller 1200, the heating cable 431 included in the mold temperature control unit 400 can heat the mold 100, and power is supplied through the power supply unit 511 of the supply unit 500' to the heating cable. (431).

Then, when the mold 100 reaches the first target temperature for applying the release agent by the temperature sensor 1100, the release agent application step (S120) may be performed. The controller 1200 may control the release agent applicator 1400 so that the release agent applicator 1400 is inserted at one end of the mold 101 and moves linearly along the axial direction of the mold 100 . For example, the release agent applicator 1400 uniformly sprays the release agent on the inner circumferential surface of the mold 100 so that the small-diameter heat-resistant steel tube manufactured by solidifying the molten metal can be easily taken out of the mold 100 .

Meanwhile, after the release agent is applied, a second heating step (S130) may be performed. In the second heating step ( S130 ), the controller 1200 controls the centrifugal actuator 1300 so that the centrifugal actuator 1300 transmits a driving force to the plurality of support rollers 200 . The centrifugal driver 1300 transmits a driving force to a main roller among the plurality of support rollers 200, and the mold 100 may also centrifugally rotate by the rotation of the plurality of support rollers 200. In the second heating step ( S130 ), the outer circumferential surface of the mold 100 may be heated to reach a second target temperature higher than the first target temperature of the first heating step ( S110 ). Means for heating the mold 100 in the second heating step ( S130 ) may be the same plurality of heating nozzles 430 or heating cables 431 as in the first heating step ( S110 ).

Meanwhile, in the first heating step (S110) and the second heating step (S130), since the mold cover 420 is disposed to cover a part of the outer circumferential surface of the mold 100, heat loss emitted while the mold 100 is heated is minimized. can do.

In addition, a pressure roller pressing step (S140) of pressing the upper side of the outer circumferential surface of the mold 100 may be performed. In the step of pressing the pressure roller ( S140 ), the controller 1200 may control the pressure unit driver 1900 . The controller 1200 may bring the pressure roller 330 into contact with the outer circumferential surface of the mold 100 so that the pressure roller 330, which is one component of the pressure unit 300, presses a portion of the outer circumferential surface of the mold 100. The controller 1200 may control the pressure unit actuator 1900 to rotate the pressure unit hinge 310 in one direction, and accordingly, the pressure roller 330 may press and contact the outer circumferential surface of the mold 100 .

Meanwhile, the pressure roller pressing step (S140) is illustrated as being performed after the second heating step (S130), but is not necessarily limited thereto. That is, if the pressure roller pressing step (S140) is a process in which the mold 100 rotates centrifugally, it is performed together with the corresponding process to minimize vertical vibration of the mold 100.

Thereafter, a molten metal injection step (S150) may be performed. In the molten metal injection step ( S150 ), the controller 1200 may control the molten metal automatic injector 1500 to inject molten metal from one end of the mold 101 to the inner circumferential surface of the mold 100 .

Then, when the molten metal is injected into the mold 100, a centrifugal casting step (S160) may be performed. In the centrifugal casting step (S160), the controller 1200 controls the centrifugal driver 1300 so that the mold 100 rotates at a higher rotational speed than the rotational speed of the mold 100 rotated in the release agent application step (S120). can Meanwhile, the driving force generated by the centrifugal driver 1300 is transmitted to the plurality of support rollers 200 through a belt pulley or the like, and the mold 100 may rotate at a rotational speed suitable for centrifugal casting of molten metal.

After the centrifugal casting step (S160), a cooling step (S170) may be performed. The controller 1200 may supply a cooling source to the plurality of cooling nozzles 440 or the cooling unit 600 by controlling the cooling source supplier 1700 . In addition, for more rapid cooling of the mold 100, the controller 1200 controls the heating unit driver 1800 so that the mold temperature control unit hinge 410 rotates counterclockwise to move the mold cover 420 to the mold ( 100) can be spaced from the outer circumferential surface. Accordingly, heat emitted from the outer circumferential surface of the mold 100 can be easily released without being hindered by the mold cover 420 .

Also, in the cooling step ( S170 ), the controller 1200 may control the cooling source supplier 1700 so that the cooling source (eg, cooling water) is supplied to the cooling source supply unit 520 among the supply units 500 . The cooling source is supplied to the plurality of cooling nozzles 440 or the plurality of upper cooling nozzles 620 of the cooling unit 600, and the cooling source is supplied to the plurality of cooling nozzles 440 or the plurality of upper cooling nozzles ( 620 may be sprayed toward the mold 100 . The mold 100 may be cooled by sprayed cooling water, and the molten metal may be solidified to be a small-diameter heat-resistant steel tube separated from the mold 100 .

After the cooling step (S170) is performed, a product taking out step (S180) may be performed. When the mold 100 reaches a certain temperature or less in the temperature sensor 1100, the controller 1200 may stop the cooling source supplier 1700 from operating. In addition, the controller 1200 may take out the manufactured small-diameter heat-resistant steel tube in one direction by controlling the product take-out machine.

Meanwhile, when the mold 100 needs to be replaced, the controller 1200 controls the heating unit driver 1800 and the pressurization unit driver 1900 to rotate the pressurization unit hinge 310 of the pressurization unit 300 clockwise. and the mold temperature control unit hinge 410 of the mold temperature control unit 400 may be rotated counterclockwise. Accordingly, the mold 100 is released from the pressure state by the pressure roller 330 and the cover state by the mold cover 420, and the mold 100 can be easily replaced.

The small-diameter heat-resistant steel tube produced by such a series of processes has an advantage of having improved quality because it is centrifugally cast in a state in which the vibration of the mold 100 is minimized. In addition, since the process of heating and cooling the mold 100 is automatically performed, the heating and cooling process of the mold 100 is safely performed than when the operator manually heats and cools the mold 100 in the prior art, and the mold (100) has the advantage of being able to uniformly heat or cool.

In addition, since the mold 100 is rapidly cooled and the product can be taken out, there is an advantage in that productivity of the small-diameter heat-resistant steel tube is improved.

In addition, since the mold cover 420 of the mold temperature control unit 400 may cover a part of the outer circumferential surface of the mold 100 or be spaced apart from the mold 100 while the pressure roller 330 presses the mold 100, the mold 100 There is an advantage in that the mold 100 can be heated and cooled in this stably supported and pressed state.

The above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

1, 2, 3, 4, 5: Small diameter heat-resistant steel tube manufacturing device using centrifugal casting
100: mold 200: support rollers
300: pressurization unit 400: mold temperature control unit
500: supply unit 600: cooling unit

Claims (14)

A mold in which molten metal is injected into the inner circumferential surface and rotates centrifugally;
a plurality of support rollers supporting first and second sides of the mold;
a pressure unit including at least one pressure roller that rotates along with the rotation of the mold by contacting a portion of the outer circumferential surface with a third side, which is an upper portion of the mold, and pressurizes the mold; and
A small diameter heat-resistant steel tube manufacturing apparatus using centrifugal casting, characterized in that it comprises a; mold temperature control unit covering a part of the outer circumferential surface of the mold and providing heat to the mold. The method of claim 1,
The plurality of support rollers
a plurality of first support rollers supporting the first side of the mold; and
A plurality of second support rollers supporting the second side of the mold; includes,
Small diameter heat-resistant steel tube manufacturing apparatus using centrifugal casting, characterized in that at least one of the plurality of first support rollers and the plurality of second support rollers rotates in one direction by receiving a driving force. The method of claim 2,
A first radial support force in which the first support rollers radially support the mold, a second radial support force in which the second support rollers radially support the mold, and a pressure roller support the mold in a radial direction Small-diameter heat-resistant steel tube manufacturing apparatus using centrifugal casting, characterized in that the resultant force of the pressing force to press is perpendicular to the ground. The method of claim 1,
The pressure roller is a small diameter heat-resistant steel tube manufacturing apparatus using centrifugal casting, characterized in that disposed in the axial center of the mold. The method of claim 1,
The pressurization unit,
a first pressure roller disposed at the axial center of the mold at the third side as an upper portion of the mold;
a second pressure roller spaced apart from the first pressure roller by a predetermined distance in a first direction and disposed on the third side; and
A small diameter heat-resistant steel tube manufacturing apparatus using centrifugal casting, characterized in that it comprises a; third pressure roller spaced apart from the first pressure roller by a predetermined distance in a direction opposite to the first direction and disposed on the third side. The method of claim 1,
The pressurization unit,
a pressure unit hinge formed in parallel with the axial direction of the mold and rotating in one direction to contact or separate the pressure roller from the outer circumferential surface of the mold; and
A pressure unit hinge extension portion extending from an outer surface of the pressure unit hinge and connecting the rotation center of the pressure roller and the pressure unit hinge; Small diameter heat-resistant steel tube manufacturing apparatus using centrifugal casting. The method of claim 6,
The pressure unit hinge extension portion is a small diameter heat-resistant steel tube manufacturing apparatus using centrifugal casting, characterized in that formed in an arch shape having a predetermined radius of curvature. The method of claim 1,
The mold temperature control unit,
A mold cover covering a part of the outer circumferential surface of the mold and spaced apart from the outer circumferential surface of the mold by a predetermined distance;
The mold cover includes at least one cover slit accommodating at least a part of the pressure roller so that the pressure roller contacts the third side of the mold,
A small diameter heat-resistant steel tube device using centrifugal casting, characterized in that the thickness of the cover slit is greater than the thickness of the pressure roller. The method of claim 8,
The mold temperature control unit,
A plurality of heating nozzles directed to the mold on the inner circumferential surface of the mold cover and arranged in a direction parallel to the rotational axis of the mold; further comprising,
The plurality of heating nozzles heat the mold through a combustion source supplied through a combustion source supply unit formed at one end of the mold cover. The method of claim 9,
The mold temperature control unit,
A plurality of cooling nozzles spaced apart from the plurality of heating nozzles, oriented to the mold on the inner circumferential surface of the mold cover and arranged in a direction parallel to the rotational axis of the mold; further comprising,
The plurality of cooling nozzles are spaced apart from the combustion source supply unit and spray a cooling source supplied through a cooling source supply unit formed at one end of the mold cover to cool the mold. Device. The method of claim 1,
A cooling unit including a plurality of upward cooling nozzles formed from the lower side of the mold upward to face the mold and arranged in a direction parallel to the rotational axis of the mold; Caliber heat-resistant steel tube device. The method of claim 8,
The mold temperature control unit,
It further includes a heating cable formed to be buried in at least a portion of the mold cover,
The heating cable heats the mold through power supplied through a power supply formed at one end of the mold cover. The method of claim 1,
The mold temperature control unit,
A plurality of mold covers covering a part of the outer circumferential surface of the mold and spaced apart from the outer circumferential surface of the mold by a predetermined distance;
A small diameter heat-resistant steel tube device using centrifugal casting, characterized in that the gap between the mold covers is formed larger than the thickness of the pressure roller, so that the pressure roller contacts the third side of the mold. The method of claim 2,
Small diameter heat-resistant steel tube device using centrifugal casting, characterized in that the height of the center of rotation of the first support rollers and the height of the center of rotation of the second support rollers are different.

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