JP4671554B2 - Mold with temperature-controlling fluid passage and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold having a temperature control fluid passage and a manufacturing method thereof, and more particularly, a molding die having a passage through which a heating fluid or a cooling fluid flows, a manufacturing method thereof, and such a molding die and the molding thereof. The present invention relates to a combination body with a mold base material that accommodates a mold.
[0002]
In order to adjust the temperature of a mold such as a plastic mold, a rubber mold, a glass mold or a die cast mold, a fluid passage is formed in the main body of the mold, and a cooling fluid or a heating fluid is allowed to flow in the fluid passage. This has been known for some time. In such a known mold and its manufacturing method, as shown in FIG. 15, the fluid passage is formed in the body 2 of the mold 1 so that a plurality of through holes 3 intersect each other from the outer peripheral surface, and the through holes are formed. Some of the openings on the outer peripheral surface are closed with plugs 4 and the rest are used as an inlet port 5 and an outlet port 6, and a cooling liquid or a heating liquid is allowed to flow in a fluid passage defined by a plurality of through holes. The temperature is adjusted. The fluid may be liquid or gas.
[Problems to be solved by the invention]
[0003]
However, in such a conventional mold, since the fluid passage is composed of a combination of a plurality of straight through holes, the shape of the fluid circuit is limited, and an optimum pattern fluid circuit is formed according to the molded product. Not only is it extremely difficult to do this, but there is also a problem that the number of steps in the manufacturing process increases and the cost increases. Furthermore, in a conventional mold with a fluid passage, a through hole is formed in the center of the mold, and at least one molding core that defines a mold cavity is removably inserted into the through hole. Since it is difficult to form a cooling passage in the mold itself, as shown in FIG. 16, a plurality of molds connected to a rectangular mold base material 7a that defines a cavity Cv into which the mold is inserted, are connected. The through hole 3a was formed linearly, and a part of the through hole 3a was closed with a plug 4a to form a passage. For this reason, it is difficult to accurately control the heating and cooling temperatures by bringing the mold close to the shape in the vicinity of the molded product, and it is difficult to control the temperature appropriately. There was a limit.
[0004]
One problem to be solved by the present invention is a joining technique (pulsed sintering) applying a pulsed current sintering method (pulsed current pressure sintering method) such as discharge plasma sintering, discharge sintering, plasma activated sintering method, etc. The present invention is to provide a novel mold having a temperature adjusting fluid passage and a method for manufacturing the same, which eliminates the disadvantages of the conventional mold and the method for manufacturing the same.
Another problem to be solved by the present invention is to provide a mold having a temperature adjusting fluid passage and a method of manufacturing the same which can design a circuit pattern of the temperature adjusting fluid passage in an arbitrary pattern. is there.
Another problem to be solved by the present invention is to provide a molding die with a temperature adjusting fluid passage and a method for manufacturing the same, in which a circuit for the temperature adjusting fluid passage can be provided over a plurality of layers at a low cost.
Still another problem to be solved by the present invention is to provide a novel combination of a mold with a temperature adjusting fluid passage and a mold base material defining a cavity for accommodating such a mold. It is.
[0005]
[Means for Solving the Problems]
One invention of the present application is a molding die with a temperature adjusting fluid passage capable of adjusting a temperature by flowing a fluid, at least two members arranged substantially coaxially on the inside and outside, and adjacent to both ends of the two members. And an end member joined at the end surface of the member, and a fluid passage for flowing the fluid is formed between the outer peripheral surface of the inner member and the inner peripheral surface of the outer member. , At least one of the end member is formed with at least one of an inlet port and an outlet port respectively communicating with the fluid passage, and at least the member and the end member are Applied pulsed current pressure sintering method At least one forming core that is temporarily bonded by a pulse current bonding method and then heat-treated to complete the bonding, and in the shaft hole formed in the inner member, defines a mold cavity in the shaft hole. Is configured to be detachably inserted.
In one embodiment of the above mold, the opposing surfaces of the members stacked on the inside and outside, and the member and the end member may be temporarily joined by a pulse current joining method, and the shaft may be The hole is a through-hole penetrating in the axial direction, and the molded core is composed of a plurality of core members that cooperatively define the cavity, and at least one of the core members is detachably inserted into the shaft hole. Also good.
In another embodiment of the mold, the inlet port and the outlet port are formed on one of the end members, and the passage is formed on at least one of an outer peripheral surface of the inner member and an inner peripheral surface of the outer member. A plurality of annular grooves formed in the circumferential direction and spaced apart in the axial direction; and at least one of the outer peripheral surface of the inner member and the inner peripheral surface of the outer member; A first axial passage that communicates with the inlet port is formed, and at least one of the outer peripheral surface of the inner member and the inner peripheral surface of the outer member is the circumferential direction of the first axial passage. Even if a second axial passage that communicates the annular groove and the outlet port is formed at different positions, the passage is at least of the outer peripheral surface of the inner member and the inner peripheral surface of the outer member. Little formed on one side Both are constituted by a single spiral groove, and at least one of the inner member and the outer member is formed with a first axial passage that communicates one end of the spiral groove and the inlet port. At least one of the member and the outer member is formed with a second axial passage that communicates the other end of the spiral groove and the outlet port at a position different from the first axial passage in the circumferential direction. Alternatively, the passage is formed in at least one of the outer peripheral surface of the inner member and the inner peripheral surface of the outer member, and extends in the axial direction and is separated in the circumferential direction. The both end members are formed with a passage that communicates with the axial groove, and one of the passages can communicate with the inlet port, and the other of the passages can communicate with the outlet port. May be .
[0006]
Another invention of the present application is a method of manufacturing a mold with a temperature adjusting fluid passage capable of adjusting a temperature by flowing a fluid.
Providing at least two members having both end faces and being arranged substantially coaxially inside and outside, and two end members joined to the both end faces;
Forming the fluid passageway between faces facing each other when overlapped inside and outside;
Forming at least one of an inlet port and an outlet port respectively communicating with the passage in at least one of the end members;
The end surface of the member and one surface of the end member are brought into contact with each other, and at least the end surface and the surface of the end member Applied pulsed current pressure sintering method Temporary bonding by pulse current bonding method, then heat treatment to complete the bonding and make the base material,
Machining the base material to form a shaft hole for inserting a core member;
Inserting at least one core member defining a cavity of the mold into the hole;
It is comprised including.
In one embodiment of the manufacturing method, the joining surface may be processed into a mirror surface. In another embodiment, the heat treatment may be performed in a temperature range of 55 to 85% of the melting temperature of the block material in a vacuum atmosphere.
[0007]
Another invention of the present application is a combination of a mold having a temperature adjusting fluid passage capable of adjusting a temperature by flowing a fluid, and a mold base material defining a storage space for storing the mold,
The mold includes at least two members arranged substantially coaxially on the inside and outside, and an end member arranged adjacent to both ends of the two members and joined at the end surfaces of the members; A fluid passage for flowing the fluid is formed between the outer peripheral surface of the inner member and the inner peripheral surface of the outer member, and at least one of the end members communicates with the fluid passage. At least one of an inlet port and an outlet port is formed, and at least the member and the end member are Applied pulsed current pressure sintering method At least one forming core that is temporarily bonded by a pulse current bonding method and then heat-treated to complete the bonding, and in the shaft hole formed in the inner member, defines a mold cavity in the shaft hole. Is formed detachably inserted,
A heat insulating layer is provided between the mold base material and the mold.
In the above combination, the heat insulating layer may be at least one of a heat insulating space layer and a heat insulating material layer.
[0008]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, in FIG. 1 to FIG. 6, an embodiment of a molding die and a manufacturing method thereof according to the present invention is shown as a plastic gear molding die and a manufacturing method thereof. A plurality of members (four in this embodiment) divided in advance to prepare a fluid passage for flowing a coolant such as water and oil in the mold of this embodiment are prepared, and one of the members is prepared. Alternatively, after forming fluid passages in two pieces, the members are joined by a joining method (pulse current joining method) applying a pulse current sintering method such as discharge plasma sintering, discharge sintering, or plasma activated sintering method. Then, it is integrated as a base material 11 for a molding die, and thereafter, the core material is subjected to mechanics and the like, and then a core member is attached to form a plastic gear molding die 10. The mold base material 11 is made of a material suitable as a mold material, for example, SUS420J2 (stainless steel), and has two cylindrical members 20 and 30 arranged coaxially on the inside and outside. And two annular end members 40 and 50 disposed at both ends of the members. The members 20 and 30 have the same axial direction (vertical direction in FIGS. 1 and 3) length. One surface (upper surface in FIG. 2) 41 of the lower end member 40 (in FIG. 1) is processed into a flat surface (preferably a mirror surface). Further, both end surfaces 21 and 31 (upper end surface in FIG. 2) and 22 and 32 (lower end surface in FIG. 2) of the inner and outer members 20 and 30 are also processed into flat surfaces (preferably mirror surfaces). Further, the lower surface (in FIG. 2) 52 of the upper end member 50 (in FIG. 1) is also processed into a flat surface (preferably a mirror surface). Further, the surfaces of the members 20 and 30 facing each other, that is, the outer peripheral surface 24 of the member 20 and the inner peripheral surface 33 of the member 30 are also processed into mirror surfaces. In addition, although the numerical range about a mirror surface is not necessarily clear, here, it says the surface processing state which has the smoothness of the numerical value below Ra0.3 (a smoothness becomes high when a numerical value becomes small). A plurality (5 in this embodiment) of annular grooves 25 extending in the circumferential direction are formed on the outer circumferential surface 24 of the inner member 20 so as to be spaced apart in the axial direction. The outer diameter of the inner member 20 and the diameter (inner diameter) of the inner peripheral surface 33 of the outer member 30 are dimensions that allow the member 20 to fit snugly within the shaft hole of the member 30 (for example, the inner diameter of the outer member). And the outer dimension of the inner member is determined to be 2 to 50 μm. The outer peripheral surface 24 of the member 20 further includes two axial grooves 26 and 26 'extending in the axial direction from one end surface (the upper end surface in FIG. 2) to the annular groove 25 farthest from the end surface. Is formed. The axial grooves 26, 26 'form an axial passage. The annular groove and the axial groove may be formed by machining such as lathe processing or milling, or may be formed by casting. In this embodiment, the diameter (inner diameter) of the inner peripheral surface 23 of the inner member 20 and the diameter (inner diameter) of the inner peripheral surfaces of the end members 40 and 50 are formed to be the same. The diameter (outer diameter) of the outer peripheral surface 34 is the same as the diameter (outer diameter) of the outer peripheral surfaces of the end members 40 and 50. Note that the outer shape of the end member may be made larger than that of the outer member, and the dimensions may be adjusted later by machining as necessary. Further, the end surfaces of the members 20 and 30 and the surface of the end member in contact with the end surfaces do not necessarily have to be flat, and may be curved surfaces if both have the same curvature.
[0009]
One end member (upper end member in FIGS. 1 and 2) 50 has two ports 56 having one end opened on the lower surface (in FIGS. 1 and 2) 52 of the end member 50 and the other end opened on the outer peripheral surface 54. And 56 '. One of these ports functions as an inlet port and the other functions as an outlet port. The radial positions of the open ends on the lower surface side of the two ports 56 and 56 ′ are positions aligned with the axial grooves 26 and 26 ′ formed in the inner member 20. A pair of positioning holes 27 for positioning pins are formed on both end faces 21 and 22 of the member 20 so as to be separated from each other in the diameter direction. In addition, a pair of positioning holes 57 that align with the positioning holes 27 are formed in the lower surface 52 of the end member 50 that contacts the end surface 21, and a pair that aligns with the positioning holes 27 in the upper surface 41 of the end member 40 that contacts the end surface 22. Positioning hole 47 is formed.
[0010]
The member 30 is mounted on the outside of the member 20 that has been machined in advance as described above, and the end members 40 and 50 are disposed at both ends of the members 20 and 30. The member 20 and the end members 40 and 50 are positioned by positioning pins inserted into the positioning holes 27, 47 and 57. In this state, the lower surface side open ends of the pair of ports 46 and 46 ′ formed in the end member 40 are aligned with the open ends of the upper surface 21 of the axial grooves 26 and 26 ′ formed in the member 20. Therefore, in this embodiment, the upper surface 21 of the member 20, the upper surface 31 of the member 30, and the lower surface 42 of the end member 40 are joined to each other, and the lower surface 22 of the member 20 and the lower surface 32 of the member 30. And the upper surface 52 of the end member 50 form a pair of joint surfaces. In this state, as shown in FIG. 7, it is arranged between a pair of energized electrodes of a pulse energization joining apparatus 100 to which a pulse energization sintering method such as a discharge plasma sintering method is applied. The base material 11 is formed by joining and integrating the joint surfaces of each pair.
[0011]
The pulse energization bonding apparatus 100 includes, for example, an energization bonding unit 110 and a heat treatment unit 120. The current-carrying joint 110 is mounted on the base 111 through an insulating member and electrically insulated from the base by a known method and fixed to the lower conductive electrode 113. A fixed fluid pressure cylinder 114 and an upper energizing electrode fixed electrically insulated from the piston rod 115 by a known method via an insulating member at the tip (lower end in the figure) of the piston rod 115 of the fluid pressure cylinder 114 116. The fluid pressure cylinder functions as a pressurizing device that presses the material to be joined. As the pressurizing device, the upper energizing electrode may be moved up and down by an electric motor and a screw mechanism instead of the fluid pressure cylinder. The upper and lower energization electrodes are electrically connected to the power supply device 117. The power supply device can supply a DC pulse current. The power supply device 117 has a built-in switch mechanism (not shown) that electrically connects and disconnects the power supply and the energizing electrode. The power that can be supplied by the power supply device is a large current with a voltage of 100 V or less and a current of 2000 to 8000 A, for example. In the above example, the lower energizing electrode is fixed and the upper energizing electrode is moved. However, the opposite is also possible, or both may be moved. The heat treatment unit 120 may be a vacuum heat treatment furnace having a known structure capable of heat treatment in a vacuum atmosphere or a gas atmosphere furnace capable of heat treatment in an inert gas atmosphere. In addition, the pulse energization joining device 110 and the heat treatment unit 120 are integrally structured, and a product transport robot device is disposed between them, and a plurality of temporarily joined base materials are collectively heat treated in a batch manner. Alternatively, they may be arranged separately. In the above embodiment, the upper energizing electrode is fixed by, for example, a plurality of columns (not shown), and a pressurizing device such as a fluid pressure cylinder is arranged on the table 111, and the lower energizing electrode is used by the pressurizing device. You may make it move up and down.
[0012]
After a plurality of members 20, 30, 40, and 50, which are superimposed and positioned on each other, are set between the pair of energizing electrodes 113 and 116 of the joining device 100, a predetermined pressure, for example, 0 to 50 is applied by the pressurizing device. When a DC pulse current of a predetermined current is applied at a predetermined voltage between current-carrying electrodes according to the volume, cross-sectional area, material, shape, size, etc. of the object to be joined in a state where the pressure is in the megapascal range. The contact interface portion having a high contact resistance is heated to a high temperature by Joule heating. Further, the whole is Joule-heated by the resistance value of the material itself. In addition, high pressure is generated at the contact interface between the members stacked on the inside and outside due to plastic deformation and thermal expansion caused by the vertical uniaxial pressure. Furthermore, an electric field is generated along the direction of on-off pulse current flow, and electric field diffusion occurs. It is considered that this electric field diffusion effect and the aforementioned mechanical pressure of thermal diffusion contribute to solid phase diffusion bonding and derive the orientation of the metal crystal structure. For this reason, these members are between the pair of joining surfaces, that is, between the contact surfaces facing each other of the members 20 and 30, between the upper surfaces 21 and 31 of the members 20 and 30, and the lower surface 52 of the member 50, and between the lower surfaces 22 and 32. The upper surface 41 of the member 40 is joined to each other. It has been found from the joining experiment results that this joining has a higher densification rate than the conventional hot press sintering method. As a result, the bonding between adjacent blocks in this state is not perfect when viewed from the viewpoint of bonding strength because the diffusion layer is shallow in terms of energy, but the metal lattice arrangement at the bonding interface is more diffused. It is thought that they are easily aligned. Therefore, this bonded state is called temporary bonding, and the temporarily bonded member is called a temporary bonded body. The temporary joined body constituted by the temporarily joined members 20, 30, 40 and 50 is then subjected to heat treatment in a heat treatment furnace of the heat treatment section 120. As described above, the temporary bonding process and the heat treatment are performed, and therefore, this is referred to as a two-stage process. Although the heat treatment temperature and time vary depending on the material and size of the member, the heat treatment temperature and time are significantly reduced to 1/10 to 1/20 compared to the time required for solid phase diffusion bonding by conventional heat treatment alone. The joint between the joint surfaces temporarily bonded by performing this heat treatment becomes a complete joined body in a short time due to a fast densification diffusion speed, and the joined strength of the joined body is a member. The value is comparable to the strength of the material. Thereby, manufacture of the base material 11 is completed. The pressure applied by the above-mentioned pulse energization joining, the voltage and current of the pulse current, the heat treatment temperature and time, etc. vary depending on the material and size of the block, but SUS420J2 is used as the material of the member, the inner diameter of the member 20 is 40 mm, and the outer diameter is 70 mm. The inner diameter of the member 30 is 70 mm, the outer diameter is 110 mm, the axial length of both is 30 mm, the inner diameter of the end members 40 and 50 is 40 mm, the outer diameter is 110 mm, and the thickness of the end members 40 and 50 is further increased. When the thickness is 5 mm and 25 mm, respectively, the pressure is 30 megapascal, the voltage is 3 to 10 V, the current value is 5000 to 6000 amperes, the vacuum heat treatment temperature and time are 950 to 1100 ° C. and 60 to 120 minutes, respectively. It is preferred to obtain good results.
During heating, when the outer peripheral surface of the member 20 tries to expand outward from the central axis, the outer periphery with the member 30 expands outward from the central axis, and the inner peripheral surface tends to expand in the direction of the central axis. As a result, even if the member 20 is not fitted into the member 30 by an interference fit, the gap ring between the contact surfaces of both members becomes smaller. Furthermore, since the member 30 is cooled first at the time of cooling, and the member 20 is further tightened by contraction, even if no pressure is applied from the outside at the time of energization joining, the state is the same as the pressurized state, and the joining becomes more complete. The inner peripheral surface of the member 30 may expand outward depending on the shape, but the thickness of both members is set so that the difference from the thermal expansion to the outer side of the outer peripheral surface of the member 20 works in the direction of reducing the gap. It is preferable to make the gap range where the gap disappears due to thermal expansion and contraction and the thickness of the member.
[0013]
In the mold base material 11 thus formed, a fluid passage through which a temperature adjusting fluid defined by a plurality of annular grooves 25 and axial grooves 26 and 26 ′ formed in the member 20 flows. Is formed. When one port 46 communicating with the axial groove 26 is an inlet port and the port 46 ′ communicating with the axial groove 26 ′ is an outlet port, fluid flows in parallel from the axial groove 26 into the plurality of annular grooves 25. Flows out of outlet port 46 'via axial groove 26'. In addition, since the mirror surface processing is performed in advance between each pair of joining surfaces, dense joining is performed, and the fluid does not flow out from the fluid passage through the joining surfaces. In the base material 11, a through hole 12 is formed in the center portion (a position radially inward of the circular groove and does not interfere with the groove) as shown in FIG. 11 '. In this embodiment, the through hole 12 is intermediate between the portion 13 having a circular cross section of the diameter D1, the portion 14 having a circular cross section of the diameter D2 (D2> D1), and the portions 13 and 14. And a portion 15 in which a large number of irregularities are formed in a spline shape. The unevenness formed on the inner periphery of the portion 15 is a portion that forms a plurality of teeth of a plastic gear that is a molded product, and is therefore formed in accordance with the shape and dimensions of the plastic gear.
When a cylindrical member is used as the inner member 20 and an annular member is used as the end member as in the above embodiment, the inner diameter thereof is smaller than the minimum diameter of the portion processed as described above. It is necessary to use materials with small values. By using a cylindrical member and an annular end member in advance, it is possible to reduce the labor of machining as described above. However, a solid cylindrical body is used as the member 20 and a disc-shaped end member is used. May be. In the case where the plastic gear has a helical gear instead of a straight gear, it is needless to say that the irregularities formed in the portion 15 have a shape corresponding to the helical gear.
[0014]
On the other hand, a core member that defines a cavity (a cavity into which a plastic material is poured) required for plastic molding in the through hole is manufactured in a separate manufacturing process. The core member of this embodiment is composed of two core members 60 and 70 shown in FIGS. One core member 60 includes a large-diameter portion 63 having an outer diameter that is closely fitted to a portion having a diameter D1 of the through-hole 12 formed in the main body 11 ′, and a portion 15 of the main body 11 in the through-hole 12. A small diameter portion 64 having a diameter d1 is formed which cooperates to define an annular cavity. Further, a stepped core hole 65 penetrating from one surface 61 (the surface that is the upper surface in FIG. 4 and that is inside the through hole 12 of the main body) 61 to the other surface 62 of the axis OO of the core member 60. Is formed. A circular recess 66 having a diameter d2 is formed at the center of the surface 61. Furthermore, a plurality of through holes 67 and 68 are formed in the core member 60 at positions on the circumferences of the radii r1 and r2 from the axis OO in the circumferential direction. Extrusion pins 82 and 83 for extruding the molded product are inserted into these through holes. The other core member 70 has a large-diameter portion 73 having an outer diameter that is tightly fitted in a portion of the through hole 12 formed in the body 11 and having a diameter D2, and an annular shape in cooperation with the body 11 in the through hole 12. A small-diameter portion 74 having a diameter d1 that defines a cavity is formed. Further, the core member 70 is formed with a molding material injection port 75 penetrating from one surface 71 (the surface which is the upper surface in FIG. 5 and becomes the inside of the through hole 12 of the main body) 71 to the other surface 72. A circular recess 76 having a diameter d2 is formed at the center of the surface 71. The core members 60 and 70 as described above are inserted together with the shaft 81 into the through hole 12 of the main body 11 ′ as shown in FIG. The through hole portion 14 may be a tapered hole that widens toward the outside of the main body. In that case, the outer periphery of the portion 73 of the core member 70 is also tapered.
[0015]
In the above embodiment, the annular groove 25 is formed in the outer peripheral surface 24 of the inner member 20 among the two members arranged inside and outside, and the fluid passage is configured. (1) The inner peripheral surface 33 of the outer member 30 (2) An annular groove that is aligned with the outer peripheral surface of the member 20 and the inner peripheral surface of the member 30 is formed, and the fluid passage is configured by these annular grooves. May be. In the case of (1), the axial groove is formed on the inner peripheral surface 33 of the member 30, and in the case of (2), the axial groove is formed on both the outer peripheral surface of the member 20 and the inner peripheral surface of the member 30. Is preferred. Further, the groove extending in the circumferential direction is not an annular groove, but is formed on the spiral groove 25a formed on the outer peripheral surface 24a of the inner member 20a or the inner peripheral surface 33b of the outer member 30b as shown in FIG. The spiral groove 35b is formed, and one end (the upper end in FIG. 8) of the spiral groove is connected to one port 56a, 56b formed in the end member 50a, 50b via the axial passage 26a, 26b, and the other end. (The lower end in FIG. 8) may be connected to the other ports 56a 'and 56b' via the axial passages 26a 'and 26b'. Further, the spiral groove may be a plurality of strips instead of a single strip so that the fluid can flow separately.
Furthermore, as shown in FIG. 9, a plurality of axial directions in which the fluid passage formed between the two members arranged inside and outside extends in the axial direction to the outer periphery 24c of the inner member 20c. For example, the groove 25c may be formed by being separated in the circumferential direction like a spline and configured by the axial groove. Of course, although not shown, an axial groove may be formed on the inner peripheral surface of the outer member, thereby forming a fluid passage. When the fluid passage is formed by the axial passage, as shown in FIG. 10, annular grooves 47c and 57c communicating with the axial groove are provided on the upper surface 41c of the end member 40c and the lower surface 52c of the end member 50c, respectively. The groove 57c may be connected to the port 56c, and the groove 47c may be connected to another port 57c 'through the communication hole 26c formed in the inner member 20c.
[0016]
The mold 10 produced as described above is inserted into a cavity for mounting a mold base material. In this case, as shown in FIG. A heat insulating space Ic is formed between the outer periphery of the member 30d outside the mold 10d and the inner periphery of the cavity. For this reason, as in the mold 10d, the inside diameter of the cavity 201 is made larger than the outside diameter of the member 30d so that a heat insulating space is formed between them, and the outside diameters of the end members 40d and 50d are closely fitted in the cavity. (For example, the dimensional difference between the inner diameter of the outer member and the outer shape of the inner member is 2 to 50 μm). Instead of increasing the outer diameter of the end member, heat insulation may be performed by fitting a ring made of a heat insulating material to an end member having the same outer diameter as that of the member 30d. Also, as shown in FIG. 12, a sleeve 80 is fitted to the outside of the end members 40e and 50e having a larger outer diameter of the mold 10e and fixed by welding or the like, and between the sleeve and the outer member 30e. A vacuum cavity Vc maintained in a vacuum state (negative pressure state) may be provided, thereby enhancing the heat insulation effect. Reference numeral 81 denotes a reinforcing rib. Further, as shown in FIG. 13, the outer diameters of the end members 40f and 50f of the mold 10f are made larger than the outer diameter of the member 30f, and a heat insulating sleeve 85 is fixed to the outer side of the end member to form a heat insulating sleeve. A mold may be inserted. In this way, by forming a heat insulating layer of at least one of the heat insulating space and the heat insulating material between the mold and the mold base material, the temperature control of the mold can be performed more easily and efficiently, and at a high temperature. Molding with a resin material (for example, 300 ° C. or higher) that requires this molding becomes possible.
[0017]
In FIG. 14, yet another embodiment of the mold of the present application is shown. In the previous embodiment, an example in which there are two members stacked on the inside and outside has been shown, but in this embodiment, three members are heated and cooled so that the temperature can be controlled. In the figure, another cylindrical member 90g is arranged between two cylindrical members 20g and 30g arranged coaxially inside and outside. These members have the same axial length, and end members 40g and 50g are arranged at both ends. In the following, description of the same parts as those in the embodiment of FIGS. 1 to 6 will be omitted. A plurality (six in this embodiment) of annular grooves 25g extending in the circumferential direction are formed on the outer circumferential surface 24g of the member 20g so as to be spaced apart in the axial direction. The outer peripheral surface 24g of the member 20g is further formed with two axial grooves 26g and 26g 'extending in the axial direction from one end surface (the upper end surface in FIG. 2) to the other end surface, spaced apart in the diametrical direction. The axial grooves 26g and 26g 'form an axial passage. A plurality (three in this embodiment) of annular grooves 95g extending in the circumferential direction are formed on the outer peripheral surface 94g of the member 90g in the axially central portion of the member 90g so as to be separated in the axial direction. The outer peripheral surface 94g of the member 90g further includes an axial groove 96g extending in the axial direction from one end face (upper end face in FIG. 14) to the annular groove 95g farthest from the end face, and the other end face (upper face in FIG. 14). An axial groove 96g 'extending in the axial direction from the end face) to the annular groove 95g farthest from the end face is formed in a diametrically spaced manner. The axial grooves 96g, 96g 'form an axial passage. The axial grooves 26g, 26g ′ formed in the member 2 and the axial grooves 96g, 96g ′ formed in the member 90 are when the members 20, 90, 30 and the end members 40, 50 are joined together. The axial grooves 26g, 26g 'and 96g, 96g' are shifted 90 degrees in the circumferential direction.
[0018]
One end member (upper end member in FIGS. 1 and 2) 50g has two pairs of ports 56g, 56g ′, 59g, and 59g, one end opening on the lower surface 52g of the end member 50g and the other end opening on the outer peripheral surface 54. 'Is formed. One of these ports functions as an inlet port and the other functions as an outlet port. The two ports 56g and 56g ′ are formed to be separated from each other in the diametrical direction (180 ° in the circumferential direction). Similarly, the two ports 59g and 59g ′ are also formed to be separated from each other in the diametrical direction. As shown in FIG. 14B, the radial position of the opening end on the lower surface side of the port 56g is a position aligned with the axial groove 26 formed in the inner member 20, and the port 56g ′. The radial position of the opening end on the lower surface side of the groove 36g ′ is formed through the member 30 in the axial direction and communicates with the other axial groove 26g ′ through the groove 46g formed in the end member. It is a position that matches. As shown in FIG. 14B, the radial position of the opening end on the lower surface side of the port 59g is a position aligned with the axial groove 96g formed in the inner member 90g, and the port 59g ′ The radial position of the opening end on the lower surface side is a passage 39g 'formed through the member 30 in the axial direction and communicating with the other axial groove 59g' via a groove 49g formed in the end member. It is a position that matches. Thus, by providing three cylindrical members, it is possible to provide two different fluid passages, and to adjust the range of heating and cooling by changing the positions thereof.
In the above embodiment, an example is shown in which grooves are formed on at least one of the outer peripheral surface of the inner member and the inner peripheral surface of the outer member, and further on at least one of the inner peripheral surface and the outer peripheral surface of the intermediate member. No gaps are formed on the inner and outer peripheral surfaces of the members, and a gap is provided between the surfaces of the members stacked inside and outside (so that the members stacked inside and outside are not joined). The fluid for adjusting the temperature may flow there.
[0019]
【effect】
According to the present invention, the following effects can be obtained.
(A) A joining method (pulse current joining method) in which a groove defining a fluid passage is formed in the outer periphery of a cylindrical member or a columnar member or the inner periphery of the cylindrical member, and the member is applied with a pulse current sintering method. ), It is possible to connect a large area of the joint interface over the entire area compared to the conventional brazing and welding methods, so that there is no gap and it can be joined so that there is no leakage in the high quality. Thus, the circuit pattern of the temperature adjusting fluid passage can be accurately formed inside the forming die, and the temperature adjusting efficiency of the forming die can be improved.
(B) Since the blocks in which the grooves defining the fluid passages are formed on the surface are joined by the joining method applying the pulse current sintering method, there is a conventional method in which an O-ring groove is provided and the blocks are sealed with an O-ring. Eliminates the need for a simple circuit pattern for the desired fluid path, and allows the design of a structure that approximates the thermal distribution simulation result based on the finite element method based on thermal conductivity. A cooling and heating structure is provided, and the manufacturing cost can be reduced.
(C) Since a plurality of fluid passages can be defined, partial temperature adjustment is possible, and the quality of the molded product can be improved.
(D) With the same concept, a fluid passage can be defined inside the convex mold, and more detailed temperature control can be performed.
(E) The temperature of the mold can be controlled easily and more precisely.
[Brief description of the drawings]
FIG. 1 is a perspective view of a base material used in an embodiment of a mold with a temperature control passage of the present invention.
2 is a perspective view showing each member of the mold shown in FIG. 1 in an exploded state, and is a diagram showing an arrangement relationship of grooves, positioning holes and the like formed in each member. FIG.
FIG. 3 is a cross-sectional view of a main body of a mold formed by machining the base material of FIG.
4 is a perspective view of one core member inserted into the main body of FIG. 3;
FIG. 5 is a perspective view of the other core member inserted into the main body of FIG. 3; .
FIG. 6 is a cross-sectional view of a mold.
FIG. 7 is a diagram showing a schematic configuration of a pulse energization bonding apparatus.
FIG. 8 is a cross-sectional view showing a modification of a groove formed in a member.
FIG. 9 is a cross-sectional view showing another modified example of the groove formed in the member.
10 is a cross-sectional view illustrating a method of connecting a groove and a port in a base material having the groove of FIG.
FIG. 11 is a diagram illustrating a state in which a mold base material of a mold is attached in a cavity.
FIG. 12 is a view for explaining another attachment state of the mold base material of the mold into the cavity.
FIG. 13 is a view for explaining still another attachment state of the mold base material of the mold into the cavity.
FIG. 14 is a cross-sectional view of still another embodiment of the mold of the present invention.
FIG. 15 is a view showing an example of a conventional mold with a fluid passage.
FIG. 16 is a view showing an example of a conventional mold base material with a fluid passage.
[Explanation of symbols]
10, 10a, 10d, 10e, 10f Mold
11, 11a, 11b, 11c, 11g
12 Through hole
20, 20a, 20b, 20c member
30, 30a, 30b, 30c, 30d, 30e, 30f, member
40, 40a, 40b, 40c, 40d, 40e, 40f, end member
50, 50a, 50b, 50c, 50d, 50e, 50f, member
24, 24a, 24b, 24c
25, 25a, 25c groove 35b groove
56, 56 ', 56a, 56a', 56b, 56b ', 56c, 56c' ports
60, 70 Core member
90g member

Claims (12)

In a mold with a temperature adjusting fluid passage capable of adjusting a temperature by flowing a fluid, at least two members arranged substantially coaxially on the inside and outside, and arranged adjacent to both ends of the two members, An end member joined at an end surface of the member, and a fluid passage is formed between the outer peripheral surface of the inner member and the inner peripheral surface of the outer member, and at least of the end members. One end member is formed with at least one of an inlet port and an outlet port respectively communicating with the fluid passage, and at least the member and the end member are temporarily formed by a pulse current joining method using a pulse current pressure sintering method. At least one forming core that is heat-treated after joining and has been joined, and in the shaft hole formed in the inner member, defines a mold cavity in the shaft hole. Removably inserted temperature adjusting fluid passage with the mold being. The temperature control according to claim 1, wherein the opposing surfaces of the members stacked inside and outside and the member and the end member are temporarily joined by a pulse current joining method. Mold with flow channel. 3. The mold with a temperature control fluid passage according to claim 1, wherein the shaft hole is a through-hole penetrating in the axial direction, and the molding core cooperates to define the cavity. A molding die in which at least one of the core members is detachably inserted into the shaft hole. 4. The mold with a temperature adjusting fluid passage according to claim 1, 2, or 3, wherein the inlet port and the outlet port are formed in one of the end members, and the passage includes the outer peripheral surface of the inner member and the outer side. Formed on at least one of the inner peripheral surfaces of the member, and is constituted by a plurality of annular grooves extending in the circumferential direction and spaced apart in the axial direction, the outer peripheral surface of the inner member and the inner periphery of the outer member A first axial passage that communicates the annular groove and the inlet port is formed in at least one of the surfaces, and at least one of the outer peripheral surface of the inner member and the inner peripheral surface of the outer member is the first axial passage. A molding die in which a second axial passage that communicates the annular groove and the outlet port is formed at a position different from the one axial passage in the circumferential direction. 4. The mold with a temperature adjusting fluid passage according to claim 1, wherein the passage is formed on at least one of an outer peripheral surface of the inner member and an inner peripheral surface of the outer member. A first axial passage that communicates one end of the spiral groove and the inlet port is formed in at least one of the inner member and the outer member, and the inner member and the outer member At least one of the outer members is formed with a second axial passage that communicates the other end of the spiral groove and the outlet port at a position different from the first axial passage in the circumferential direction. . The mold with a temperature adjusting fluid passage according to claim 1, 2, or 3, wherein the passage is formed on at least one of an outer peripheral surface of the inner member and an inner peripheral surface of the outer member, A plurality of axial grooves extending in the direction and separated in the circumferential direction, the both end members are formed with a passage communicating with the axial groove, and one of the passages can communicate with the inlet port. A molding die in which the other of the passages and the outlet port can communicate with each other. In a method of manufacturing a mold with a temperature adjusting fluid passage capable of adjusting a temperature by flowing a fluid,
Providing at least two members having both end faces and being arranged substantially coaxially inside and outside, and two end members joined to the both end faces;
Forming the fluid passageway between faces facing each other when overlapped inside and outside;
Forming at least one of an inlet port and an outlet port respectively communicating with the passage in at least one of the end members;
The end surface of the member and one surface of the end member are brought into contact with each other, and at least the end surface and the surface of the end member are temporarily joined by a pulse energization bonding method applying a pulse energization pressure sintering method , Then heat treatment to complete the joining and make the base material,
Machining the base material to form a shaft hole for inserting a core member;
Inserting at least one core member defining a cavity of the mold into the hole;
The manufacturing method of the shaping | molding die containing. 7. The method for producing a mold with a temperature adjusting fluid passage according to claim 6, wherein the end surface and the surface of the end member and the opposing surfaces of the members stacked inside and outside are temporarily formed by a pulse current joining method. Manufacturing method to join. 9. The method for manufacturing a molding die with a temperature adjusting fluid passage according to claim 7 or 8, wherein the opposing surface of the member, the end surface of the member, and the surface of the end member are processed into a mirror surface. 9. The method for producing a mold with a temperature adjusting fluid passage according to claim 6, 7 or 8, wherein said heat treatment is performed in a desired atmosphere in a temperature range of 55 to 85% of a melting temperature of said block material. Mold manufacturing method. In a combination of a mold having a temperature adjusting fluid passage capable of adjusting the temperature by flowing a fluid, and a mold base material defining a storage space for storing the mold,
The molding die includes at least two members arranged substantially coaxially on the inside and outside, and an end member arranged adjacent to both ends of the two members and joined at an end surface of the member; A fluid passage for flowing the fluid is formed between the outer peripheral surface of the inner member and the inner peripheral surface of the outer member, and at least one of the end members communicates with the fluid passage. At least one of an inlet port and an outlet port is formed, and at least the member and the end member are temporarily joined by a pulsed current joining method using a pulsed current pressure sintering method, and then heat-treated, thereby completing the joining. In the shaft hole formed in the inner member, at least one molding core that defines a mold cavity in the shaft hole is detachably inserted, and is formed.
A heat insulating layer is provided between the mold base and the mold,
A combination of a mold having a temperature adjusting fluid passage and a mold base material. 12. The combination according to claim 11, wherein the heat insulating layer is at least one of a heat insulating space layer and a heat insulating material layer.

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