KR102362129B1 - Apparatus for forming casting core - Google Patents

Abstract

The present invention relates to an apparatus for forming a casting core, which can prevent damage to a core and increase work convenience through easy extraction of the core, and can form a core so that a hollow portion is formed along therewith when forming the core, thereby increasing productivity and ensuring uniform quality. The apparatus comprises: a hopper in an upper portion of which a caster is stored; an apparatus frame in which a caster supply unit for receiving the caster sand from the hopper and transferring the same is installed; a front frame fixed and installed on the front of the apparatus frame in the shape of a rim with an opening; a rear frame fixed to the rear of the apparatus frame; a front rotating frame which is installed so that a lower portion can rotate toward an inner side of the opening of the front frame, and which rotates to have a vertical state in which an upper end faces the top and a horizontal state in which the upper end faces the front; a rear moving frame installed at the rear of the front rotating frame to move back and forth so that the rear moving frame is close to or spaced apart from the front rotating frame; a front core mold fixed and installed on the rear surface of the front rotating frame to rotate together with the front rotating frame; and a rear core mold fixed and installed on the front of the rear moving frame to move back and forth together with the rear moving frame, and for receiving the caster from the caster supply unit and forming the core when the front of the rear core mold and the rear of the front core mold are not shaped while the front and the rear are shaped or not.

Description

Core forming device for casting {APPARATUS FOR FORMING CASTING CORE}

The present invention relates to a core forming apparatus for casting for forming a core that is inserted into a mold to make an internal shape of the casting during casting.

In general, casting uses the flow of a liquid, and it is a kind of material processing method in which a molten metal material is put into a prepared mold to fill and solidify the mold, and various methods are used depending on the shape and injection method of the mold. is becoming

Such casting has the advantage of being able to make a complex shape using a molten material, and specifically consists of a mold making process, a melting process, an injection process, and a mold separation process. In the mold manufacturing process, the shape and size of the mold suitable for the desired casting can be manufactured, and it must have an allowance suitable for the shrinkage of the solidified material. In the melting process, after heating the metal to an appropriate temperature to make it a liquid, hydrogen gas in the molten metal should be removed. After that, the mold is separated, and after separation, the casting process is finished through cutting, washing, heat treatment, and inspection of the inlet and sprue.

On the other hand, what is inserted into the mold to make the inner shape of the casting is called a core. The core is used to manufacture hollow products, and must have sufficient mechanical strength to withstand the heat and pressure of the molten metal during casting and maintain its shape, while at the same time being relatively easily broken or damaged so that it can be easily removed from the casting after casting. Or it should be able to be dissolved by other substances.

As a material for such a core, sand, thermosetting resin, or salt is usually used. In the case of using sand, it is called casting sand and forms a core together with a binder. After casting a desired structure around the core, the casting sand supporting the core is removed to complete the casting. For example, there are 'a mold and a casting method using the same' of Korean Patent Publication No. 10-1340890 and 'EGR valve housing casting core and a casting mold using the core' of Korean Patent Publication No. 10-2014-0105215.

In order to mold a core through the molding sand, a mold for manufacturing the molding sand is used. The molding sand is filled in a mold having a cavity corresponding to the shape of the core, and then heat is applied to the mold to sinter the molding sand.

In order to heat the mold, heat was applied from the outside of the mold through a gas torch. In this external heating method, it is difficult to uniformly heat the mold, so the molding sand filled in the cavity of the mold also has uniform heat transfer. Failure to do so may cause defects such as cracks.

Accordingly, there is a method of forming a core by directly heating the molding sand loaded in the mold through high-temperature air, such as 'A device and method for manufacturing a core using resin-coated sand' in Patent Registration No. 10-1963857, but the device is complicated. There is a problem such as taking a long time for sintering. Therefore, core molding transfers heat by planting a hot wire inside the mold to facilitate uniform heat transfer with the simplification of the device, as in 'Casting Sand Core Forming Apparatus and Casting Sand Core Forming Method' in Korean Patent Registration No. 10-2131382 The heat transfer method is widely used.

Looking more specifically at the core molding apparatus for casting according to the prior art using the heat transfer type mold as described above, the left and right heat transfer coils installed inside each are like the 'Core molding apparatus for casting' in Korean Patent Publication No. 10-0871359. It comprises a pair of middle molds, a mold operation part for opening or closing the middle molds, and a molding sand supply part for supplying molding sand to the inside when closing between the middle molds. In addition, in order to naturally fall a part of a product in which the core itself has a hollow part such as a pipe shape, that is, a part of the molding sand that is not hardened during shape molding such as a manifold, and maintains the particle state, etc. There are features available.

However, in the case of the core forming apparatus for casting according to the prior art having the configuration as described above, it is difficult for the operator in the front to take out the molded core because the pair of middle metal molds are closed and molded left and right with respect to the operator in front. , especially when taking out the molded core from the metal mold, there is a problem in that the erected core is not properly gripped and dropped or damaged due to excessive force.

On the other hand, the turbine housing for a turbocharger of a vehicle, such as 'Gravity casting mold for producing a turbine housing for a turbocharger' of Patent Registration No. 10-1807690 and 'Gravity casting core' of Korean Patent Publication No. 10-1610077 A core is also used during casting for manufacturing, and it can be seen that recently, a turbine housing is manufactured integrally with a manifold. In the drawing, the exhaust runner part of the core corresponding to the manifold is shown in a blocked shape, but recently, as shown in FIG. 19 for gas emission generated during casting, when manufacturing the core 20 for casting the turbine housing, it is placed on the manifold. The interior of the corresponding exhaust runner 22 is manufactured by working with the hollow part 22a.

Therefore, there is a need for a core forming apparatus for casting in which the hollow part can be formed together during the core molding without the need to separately process the hollow part for the core molding required for the casting of the manifold-integrated turbine housing.

An object of the present invention, devised to solve the above problems, is to prevent damage of the core and improve the convenience of work by configuring so that the molded core can be easily taken out from the middle metal mold for the operator in front, and in particular, An object of the present invention is to provide a core forming apparatus for casting that can improve productivity and ensure uniformity of quality by forming a core so that a hollow part is formed together without performing a separate hollow part operation when forming an additionally formed core.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings.

In order to achieve the above object, an apparatus for forming a core for casting according to the present invention is provided with a hopper in which the molding sand is stored, and a molding sand supply unit for receiving and transferring the molding sand from the hopper is installed. A front frame fixedly installed on the front side of the device frame in a rim shape, a rear frame fixedly installed on the rear side of the device frame, a lower portion is rotatably installed inside the opening of the front frame, and a vertical state with the upper end facing upward; A front rotating frame rotating so that the upper end has a horizontal state toward the front; A front middle mold fixedly installed on the rear surface of the front rotating frame to rotate with, and a fixed installation on the front surface of the rear moving frame so as to move forward and backward together with the rear moving frame, the front surface is mold closed with the rear surface of the front middle mold Or it comprises a rear middle mold for molding the core by receiving the molding sand from the molding sand supply unit when the mold is closed while opening the mold.

In addition, the hopper is fixedly installed on the rear upper portion of the device frame, and the molding sand supply unit is installed movably back and forth on the upper portion of the device frame, and receives the molding sand from the hopper when moving backward. It is fixedly installed on the upper part of the device frame in front of the hopper so as to correspond to the position where the front middle mold and the rear middle mold are molded, and when the casting transfer part moves forward, the casting sand supplied to the inside of the casting sand transfer part is said It is characterized in that it includes a molding sand injection part for injecting by pressing into the mold-closed interior of the front middle mold and the rear middle mold.

In addition, the molding sand supply unit is installed in front of the casting sand transfer unit, and among the molding sand injected by pressing into the molded interior of the front middle mold and the rear middle mold through the molding sand supply part, the front middle mold and It characterized in that it further comprises a scraper for sweeping away the excess molding sand remaining on the mold-closed upper surface of the rear middle mold.

In addition, further comprising a rotation operation unit for rotating the front rotation frame in a vertical state and a horizontal state, the rotation operation unit, coaxially on the lower left and right sides of the front rotation frame so as to be rotatable on the left and right sides of the opening of the front frame A pair of rotational center shafts respectively installed as a rotatable pin-coupled rotational cylinder through a bracket on the lower part of the front frame, and an exposed end operable to be drawn in and out of the rotational cylinder, of the front rotation frame A cylinder rod that is pin-coupled rotatably through the central lower part, rotates the front rotating frame in a vertical state when withdrawing from the rotating cylinder, and rotates the front rotating frame in a horizontal state when entering the rotating cylinder characterized in that

In addition, the rotation operation unit further comprises a vertical state fixing portion for fixing the position of the front rotation frame in a vertical state when the front rotation frame is in a vertical state by the operation of the rotation cylinder, the vertical state fixing portion, once It is fixedly coupled to the left front surface of the front rotation frame, and the other end protrudes in the left direction of the front rotation frame to include a rotation limiting member contacting the left front surface of the front frame when the front rotation frame is in a vertical state. characterized in that

In addition, the vertical state fixing part is fixedly installed along the circumferential surface of the front rotating frame, and is inserted into the position fixing groove recessed in the inner surface of the front frame when the position fixing pin which operates to be drawn in and out is withdrawn. It characterized in that it further comprises a fixing pin cylinder for fixing the position of the rotating frame in a vertical state with respect to the front frame.

In addition, the core is a manifold-integrated turbine housing casting core, and includes a scroll part corresponding to the turbine housing and a plurality of exhaust runner parts corresponding to the manifold, and each of the exhaust runner parts has a pipe shape. It is characterized in that the hollow part is formed.

In addition, in the front middle mold, the upper cavity connected to the upper molding sand inlet corresponds to the scroll part of the core, the lower cavity corresponds to the exhaust runner part of the core, and the pipe shape when forming the exhaust runner part of the core It is characterized in that it includes a hollow part forming part for forming a hollow part therein.

In addition, the hollow portion forming portion, a fixed plate fixedly installed to be spaced apart from the lower portion of the front middle mold, and a movable plate movably installed to approach or separate from the lower surface of the front middle mold with respect to the fixed plate; Each end is fixedly coupled to the moving plate so as to move together with the moving plate, and the other end is inserted when the moving plate is close to the lower surface of the front middle mold, and the movable plate is of the front middle mold. It is characterized in that it comprises a plurality of hollow forming rods exposed to the outside when spaced apart from the lower surface, and a movable cylinder installed on the fixed plate and moving the movable plate.

The core forming apparatus for casting according to the present invention is configured so that the molded core can be easily taken out from the front middle metal mold for the operator in the front through the front rotating frame and the rotating operation part, thereby preventing damage to the core and improving the convenience of operation In particular, there is an effect of improving productivity and guaranteeing uniformity of quality by forming the core so that the hollow part is formed together without performing a separate hollow part operation when forming the core in which the hollow part is formed through the hollow part forming part.

1 is a front view showing an embodiment of a core forming apparatus for casting according to the present invention;
Figure 2 is a side view of the embodiment of Figure 1,
3 is a side view showing a state in which the front rotating frame is rotated from a vertical state to a horizontal state by the operation of the rotation operation unit from the embodiment of FIG. 2;
4 is a side view of the main part showing a state in which the casting sand transfer unit of the molding sand supply unit receives the molding sand from the hopper in the embodiment of FIG. 2;
5 is a side view of the main part showing a state in which the front rotation frame is rotated from a horizontal state to a vertical state by the operation of the rotation operation part from the embodiment of FIG. 3;
Figure 6 is a front view of the embodiment of Figure 5,
7 is a side view showing a state in which the front of the rear middle mold is molded to the rear of the front middle mold by the forward movement of the rear moving frame from the embodiment of FIG. 5;
FIG. 8 is a side view showing the main part of the hollow forming rod of the hollow forming part when the front middle mold and the rear middle mold are closed in the embodiment of FIG. 7;
9 shows the molding sand supplied to the inside of the casting sand transfer unit by the operation of the casting sand injection unit after the casting sand transfer unit of the molding sand supply unit moves forward from the embodiment of FIGS. 4 and 7 in the molded interior of the front middle mold and the rear middle mold. It is a side view of the main part showing the process of injection by pressing with
Figure 10 is a side view showing the process of the return operation between the casting and the casting sand injection unit from the embodiment of Fig. 9,
11 and 12 are side views illustrating the process of sweeping away the excess casting sand remaining on the molded upper surfaces of the front middle mold and rear middle mold while the scraper part moves backward from the embodiment of FIG. 10;
13 is a side view illustrating a process in which the casting sand transfer unit moves backward from the embodiment of FIG. 12 to receive the molding sand from the hopper, and the molding sand injected into the front middle mold and the rear middle mold is molded into a core,
14 is a side view showing the main part of the hollow forming rod of the hollow forming part descending after the molding sand injected into the inside of the front middle mold and the rear middle mold in the embodiment of FIG. 13 is completed,
15 is a side view showing a state in which the front of the rear middle mold is opened from the rear of the front middle mold by the rear movement of the rear moving frame from the embodiment of FIG. 13;
16 is a front view of the embodiment of FIG. 15;
17 is a side view showing a state in which the front rotation frame is rotated from a vertical state to a horizontal state by the operation of the rotation operation unit from the embodiment of FIG. 15;
18 is a perspective view of a main part showing a process of taking out a molded core from a front rotating frame in a horizontal state in the embodiment of FIG. 17;
FIG. 19 is a perspective view of a main part showing a core having a molded hollow part formed in the embodiment of FIG. 18 .

Hereinafter, a preferred embodiment of a core forming apparatus for casting according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figs. 1 to 3, the core forming apparatus for casting according to the present invention is a device frame 100, a front frame 200, a rear frame 300, a front rotating frame 400, a rear moving frame 500 ), is made including the front middle mold 600 and the rear middle mold 700 , and may further include a rotation operation part 800 and a hollow part forming part 900 .

As can be seen from the name, the device frame 100 is a framework of the device, and each component to be described later is attached and coupled. As shown in FIGS. 1 to 3 , the device frame 100 is provided with a hopper 110 in which the molding sand 10 is stored, and a molding sand supply unit that receives and transports the molding sand 10 from the hopper 110 . (120) is installed. The specific position, operation relationship and configuration of the hopper 110 and the molding sand supply unit 120 installed in the device frame 100 will be described later.

The front frame 200 is fixedly installed on the front surface of the device frame 100 in the shape of a border in which an opening 210 is formed as shown in FIGS. 1 to 3 and 6 . The opening 210 of the front frame 200 is a characteristic configuration of the present invention, and a front rotation frame 400 to be described later is rotatably installed in the opening 210 of the front frame 200, and the opening ( 210) is rotated to have a vertical and horizontal state to open and close.

That is, the front rotating frame 400 is rotatably installed at a lower portion inside the opening of the front frame 200, and rotates to have a vertical state with an upper end facing upward and a horizontal state with the upper end facing forward. A front middle mold 600, which will be described later, is installed in the front rotating frame 400 for the front frame 200. After the core 20 is molded, it rotates forward together with the front rotating frame 400 and becomes a horizontal state. It is configured so that the operator in the front can easily take out the molded core 20 from the front middle metal mold 600 .

The rear frame 300 is fixedly installed on the rear surface of the device frame 100 in parallel to the front frame 200 as shown in FIGS. 2 and 3 . The front frame 200 and the rear frame 300 are fixedly installed on the front and rear surfaces of the device frame 100, respectively, and guide rods (reference numerals not shown) are provided to enable the forward and backward movement of the rear moving frame 500 to be described later. Long installed front and rear.

That is, the rear moving frame 500 is installed at the rear of the front rotating frame 400 to be movable back and forth so as to be close to or spaced apart from the front rotating frame 400 . Specifically, as shown in FIGS. 7 and 10 , the rear moving frame 500 is installed to be movable back and forth between the front frame 200 and the rear frame 300 along the guide rod, and installed on the rear frame 300 . It reciprocates by the operation of the forward/backward movement cylinder (not shown). This rear moving frame 500, the rear middle mold 700, which will be described later, is installed on the front of the rear moving frame 500 and moves back and forth together with the front middle mold 600 to be described later. to be.

The front middle mold 600 is fixedly installed on the rear surface of the front rotation frame 400 so as to rotate together with the front rotation frame 400 . Therefore, when the front middle mold 600 is molded with the rear middle mold 700 to be described later and the molding of the core 20 is completed, as shown in FIGS. 17 and 18 , it is The middle mold 600 rotates forward to become a horizontal state, and the operator in the front can easily take out the molded core 20 from the front middle mold 600 .

The rear middle mold 700 is fixedly installed on the front of the rear moving frame 500 to move forward and backward together with the rear moving frame 500 as shown in FIGS. 7 and 15 , and the front is the front middle mold As shown in FIG. 9 during mold closing or mold opening with the rear surface of 600 , the molding sand 10 is injected from the molding sand supply unit 120 to form the core 20 .

A heating wire (not shown) is provided inside the front middle mold 600 and the rear middle mold 700 to harden the core 20 by applying heat to the molding sand 10 injected inside by electrical resistance. to mold At this time, in the front middle mold 600, as shown in FIG. 18, a molding sand inlet 610 is formed on the upper surface so that the molding sand 10 injected from the molding sand supply unit 120 can be injected into the inside, and there is a core inside. Cavities 620 and 630 corresponding to the shape of 20 are formed. The rear middle mold 700 is not shown separately, but a cavity shape corresponding to the shape of the core 20 will be formed with reference to the front middle mold 600 .

On the other hand, the hopper 110 and the molding sand supply unit 120 installed in the apparatus frame 100 for supplying, transporting, and injecting the molding sand 10 will be described in detail. That is, as is widely known, the hopper 110 has a funnel shape of upper and lower halves, and although not shown in the drawing, a fixed quantity supply motor is provided at the lower portion to supply the molding sand 10 by a set amount. The hopper 110 is fixedly installed on the rear upper portion of the device frame 100 as shown in FIGS. 2 to 4 .

In addition, the molding sand supply unit 120 receives and transports the molding sand 10 by the amount set from the hopper 110 as shown in FIGS. 4 and 9, and the front middle mold 600 and the rear middle mold ( The molding sand 10 is injected into the molded interior of the front middle mold 600 and the rear middle mold 700 so that the core 20 can be molded when the 700 is closed. Specifically, the molding sand supply unit 120 includes a casting sand transfer unit 121 and a molding sand injection unit 122 , and may further include a scraper unit 123 .

As shown in FIGS. 4 and 13 , the casting transfer unit 121 is installed to be movable back and forth on the upper portion of the apparatus frame 100 , and receives the molding sand 10 from the hopper 110 when moving backward. In addition, as shown in FIGS. 9 and 10 , the molding sand injection part 122 moves toward the front of the hopper 110 to correspond to the position where the front middle mold 600 and the rear middle mold 700 are molded closed. It is fixedly installed on the upper part of the device frame 100, and when the casting transmission unit 121 moves forward, the casting sand 10 supplied to the inside of the casting transmission unit 121 is transferred to the front middle mold 600 and the rear. It is injected by pressing into the mold-closed inside of the middle mold 700 .

More specifically, the casting transfer unit 121 is provided with a transfer cylinder (not shown) which is installed so as to be able to move up and down inside and stores the mass of the casting sand 10 by a fixed amount, and the upper end of the device frame 100 is the upper part. A linear motor (not shown) is provided for moving forward and backward on a reciprocating rail (not shown) installed along the front and rear longitudinal directions, and for moving the casting intervening unit 121 back and forth.

As shown in FIGS. 4 and 13, when the casting sand transfer unit 121 moves backward, the molding sand 10 is supplied into the transfer cylinder from the hopper 110, and as shown in FIG. 9, the casting sand injection unit ( 122), the molding sand 10 stored in a fixed amount inside the transfer cylinder is injected by pressing into the molded interior of the front middle mold 600 and the rear middle mold 700. Here, the molding sand injection unit 122 is a compression cylinder installed so as to be able to move up and down, and when descending, compressed air is injected into the conveying cylinder of the casting inter-casting unit 121, and the casting sand 10 stored in the inside of the casting inter-casting unit 121 by a fixed amount. is to be injected by pressing into the mold-closed interior of the front middle mold 600 and the rear middle mold 700 .

At this time, the amount of the molding sand 10 supplied from the hopper 110 to the casting transfer unit 121 and the front middle mold ( Although the amount of the molding sand 10 injected by pressurizing into the molded interior of the 600) and the rear middle mold 700 is almost the same although there is some loss, the amount of the molding sand 20 that is actually molded with the core 20 is small. will be. Because, the molding sand 10 completely injected into the mold-closed interior of the front middle mold 600 and the rear middle mold 700 is eventually molded into the core 20. This is because the proper shape cannot come out when the ramen core 20 is molded. Accordingly, in consideration of the loss during the supply, transfer, and injection of the molding sand 10 , it will inevitably be supplied, transferred, and injected more than the amount injected during the actual molding of the core 20 .

Therefore, as shown in FIGS. 10 and 11 from FIG. 9 , the molding sand 10 transferred through the casting interim transfer unit 121 is transferred to the front middle mold 600 and the rear middle mold through the molding sand injection part 122 . After the injection is pressurized into the mold closed mold 700 , the extra molding sand 10 is left on the molded upper surfaces of the front middle mold 600 and the rear middle mold 700 . These extra molding sand 10 must be cleaned by sweeping, because the core 20 is heated to a high temperature during molding, and the extra molding sand 10 is the front middle mold 600 and the rear middle mold 700. This is because it may harden and harden by remaining on the molded upper surface of the Accordingly, a scraper unit 123 may be further included to clean the extra molding sand 10 .

As shown in FIGS. 11 and 12, the scraper part 123 is installed in front of the casting intermediary transfer part 121, and the front middle mold 600 and the rear middle mold mold (600) through the molding sand supply part 120 ( The excess molding sand 10 remaining on the molded upper surfaces of the front middle mold 600 and the rear middle mold 700 among the molding sand 10 injected by pressing into the molded interior of 700 is wiped out. Although the reference numerals are not shown in the drawings for the specific configuration of the scraper unit 123, the casting transfer unit 121 moves forward through the lifting cylinder for raising and lowering the scraper. It will be possible to clean by sweeping away the excess molding sand (10) left over.

On the other hand, as shown in FIGS. 2 and 3 , it may include a rotation operation unit 800 for rotating the front rotation frame 400 in a vertical state and a horizontal state, and this rotation operation unit 800 is illustrated in FIG. 5 . , 6 and 15 to 17, including a pair of rotation center shaft 810, the rotation cylinder 820 and the cylinder rod 830, and may further include a vertical state fixing portion (840).

That is, as shown in FIGS. 6 and 16 , the pair of rotational center shafts 810 are rotatable on the left and right sides of the opening 210 of the front frame 200 on the lower left and right sides of the front rotation frame 400 . Each is installed coaxially. Accordingly, the front rotation frame 400 rotates with respect to the front frame 200 based on a pair of rotation center axes 810 .

In addition, the rotary cylinder 820 is rotatably pin-coupled to the lower portion of the front frame 200 through a bracket 821 , and a cylinder rod 830 is installed in the rotary cylinder 820 to be retractable. That is, the cylinder rod 830 is rotatably pin-coupled through the central lower portion of the front rotating frame 400 with the exposed end operating in and out of the rotating cylinder 820 , and the rotating cylinder 820 . ), the front rotating frame 400 is rotated in a vertical state as shown in FIG. 5, and when it is drawn into the rotating cylinder 820, the front rotating frame 400 is horizontally rotated as shown in FIG. rotate to state.

At this time, the vertical state of the front rotation frame 400 rotated by the rotation operation unit 800 is not shaken and must be fixed at an accurate position. The position can be fixed in a vertical state, and accordingly, precise molding of the core 20 can be made without twisting when closing the mold with the rear middle mold 700 . Accordingly, the rotation operation unit 800 is a vertical state fixing unit for fixing the position of the front rotation frame 400 in a vertical state when the front rotation frame 400 is in a vertical state due to the operation of the rotation cylinder 820 . 840 may be further included.

First, the vertical state fixing unit 840 is a rotation limiting member capable of restricting the rear rotation of the front rotation frame 400 so that the front rotation frame 400 is not pushed backward when it rotates in a vertical state, and is precisely in a vertical state. (841). That is, the rotation limiting member 841 has one end fixedly coupled to the left front side of the front rotation frame 400 as shown in FIGS. 5 and 6 , and the other end protruding from the left side of the front rotation frame 400 , When the front rotating frame 400 is in a vertical state, it is in contact with the front left side of the front frame 200 .

Although the rear rotation of the front rotation frame 400 is restricted through the rotation limiting member 841, the front of the rear middle mold 700 is front according to the forward movement of the rear moving frame 500 as shown in FIG. While being molded on the back of the middle mold 600, the front rotating frame 400 is pushed forward. Of course, the operation of the rotating cylinder 820 of the rotating operation unit 800, the cylinder rod 830 is receiving force in the drawn out state, but if the front rotating frame 400 rotates forward even a little, the mold closing surface is displaced. A problem occurs in the precise molding of the core 20 .

Accordingly, the vertical state fixing unit 840 is fixedly installed along the circumferential surface of the front rotating frame 400 as shown in FIGS. 6 and 16 , and the position fixing pin 842a that operates so as to be retractable is drawn out. A fixing pin cylinder 842 inserted into the position fixing groove 842b recessed in the inner surface of the front frame 200 to fix the front rotation frame 400 in a vertical state with respect to the front frame 200. may include more. Even if the rear middle mold 700 moves backward to close the front middle mold 600 through the fixing pin cylinder 842, the front rotation frame 400 is limited in forward rotation so that the position can be fixed in a vertical state. there will be

On the other hand, the above description is not limited by the shape of the core 20 to be molded, and in any shape, when the core 20 is molded, it is easy to take out the molded core 20 and precise core 20 molding is possible. to do However, in the case of the core 20 including the hollow part 22a as shown in FIG. 19 , in particular, in the case of forming the manifold-integrated turbine housing casting core 20, the hollow part 22a is added together. It may further include a hollow part forming part 900 to be formed.

That is, the core 20 is a manifold-integrated turbine housing casting core as shown in FIGS. 18 and 19 , and a scroll part 21 corresponding to the turbine housing and a plurality of exhaust runner parts corresponding to the manifold (22). At this time, each of the exhaust runner parts 22 has a hollow part 22a formed therein in a pipe shape. Although the figure shows that the exhaust runner part 22 is four, it may be one, two, or three. The number of the exhaust runner parts 22 corresponds to the number of manifolds to be cast, and is determined according to the engine displacement of the vehicle, that is, the number of engine cylinders. Originally, turbochargers were mainly installed in high-displacement vehicles, but recently, there is a trend to increase output by adding turbochargers to low-displacement vehicles.

When forming the core 20 as described above, the front middle mold 600 has an upper cavity 620 connected to an upper molding sand inlet 610 as shown in FIG. 18, and the scroll part ( 21), and the lower cavity 630 corresponds to the exhaust runner part 22 of the core 20. That is, the casting burr injected into the molding sand inlet 610 has a structure connected to the scroll part 21 of the core 20 , and the exhaust runner part of the core 20 to the lower part of the front middle mold 600 . (22) is a molded structure.

Accordingly, the molding sand 10 is put into the upper part of the front middle mold 600 through the molding sand inlet 610 , but the exhaust runner part 22 is located in the lower part of the front middle mold 600 , and the front A hollow part forming part 900 for forming the hollow part 22a of the exhaust runner part 22 may be installed in the lower part of the middle metal mold 600 . That is, the hollow part forming part 900 forms a hollow part 22a therein so as to have a pipe shape when the exhaust runner part 22 of the core 20 is molded.

Specifically, as shown in FIGS. 8, 14 and 18, the hollow part forming part 900 includes a fixing plate 910 fixedly installed to be spaced apart from the lower portion of the front middle mold 600, and the fixing plate 910. A moving plate 920 installed movably to move closer to or spaced apart from the lower surface of the front middle mold 600, and one end of each of the moving plates 920 to move together with the moving plate 920 It is fixedly coupled, and each other end is inserted when the movable plate 920 is close to the lower surface of the front middle mold 600 , and the movable plate 920 is spaced apart from the lower surface of the front middle mold 600 . It includes a plurality of hollow forming rods 930 exposed to the outside when installed, and a moving cylinder 940 installed on the fixed plate 910 and moving the moving plate 920 .

That is, by the operation of the moving cylinder 940, the moving plate 920 moves toward or away from the lower surface of the front middle mold 600 with respect to the fixed plate 910 while the hollow forming rod 930 moves the moving plate. Penetrating through the lower surface of the front middle mold 600 so that the hollow portion 22a of the exhaust runner part 22 is formed with the movement of 920 to be inserted or released into the interior of the front middle mold 600 will be. Through this hollow part forming part 900, the hollow part 22a is formed together when the core 20 is formed without the need to perform a work such as drilling or high pressure injection to form the hollow part 22a of the conventional exhaust runner part 22. Molding can be completed so as to be formed, and in particular, there is an effect of saving as much as the amount of the molding sand 10 in which the hollow portion 22a is formed.

The process of forming the core 20 of FIG. 19 is sequentially shown in the chronological order of FIGS. 4 to 18 from FIG. 3 .

Briefly, as shown in FIG. 4 , the casting sand transfer unit 121 of the molding sand supply unit 120 moves backward to receive the molding sand 10 from the hopper 110 by a fixed amount, and as shown in FIG. 5 , FIG. 3 The horizontal state of the front rotation frame 400 is rotated backward by operating the rotation operation unit 800 to be in a vertical state, and at this time, the rotation limiting member 841 of the vertical state fixing unit 840 as shown in FIG. 6 . The rear rotation of the front rotation frame 400 is limited through the, and the vertical state of the front rotation frame 400 is fixed through the fixing pin cylinder 842 .

As shown in FIG. 7 , as the rear moving frame 500 moves forward, the rear middle mold 700 also moves forward, and the front of the rear middle mold 700 is the rear of the front middle mold 600 and be imprisoned As shown in FIG. 8 , the hollow forming rod 930 penetrates the molded lower surface of the front middle mold 600 and the rear middle mold 700 by the operation of the moving cylinder 940 of the hollow part forming part 900 . to be inserted into the interior, and then to form the hollow portion (22a) of the core (200).

As shown in FIG. 9 , the casting transfer unit 121 supplied with a fixed amount of the molding sand 10 from the hopper 110 moves forward, and by the operation of the molding sand injection unit 122 , the front middle mold 600 and Referring to the molded upper surface of the rear middle mold 700 , that is, FIG. 18 , it is injected into the upper cavity 620 and the lower cavity 630 through the molding sand inlet 610 . As shown in FIG. 10 , when the injection of the molding sand 10 is completed, the extra molding sand 10 is left on the upper surfaces of the front middle mold 600 and the rear middle mold 700 , and in FIGS. 11 and 12 , As shown, the scraper unit 123 sweeps away the excess sand (10) and cleans it. At this time, although the reference numerals are not shown, a collection box or a collection conveyor for collecting the excess casting sand 10 swept away from the scraper unit 123 may be installed in the lower portion of the device frame 100 .

As shown in FIG. 13 , the casting sand transfer unit 121 in which the injection of the molding sand 10 is completed moves to the rear to recharge the molding sand 10 from the hopper 110 , and the mold-closed front middle mold 600 and the rear The core mold 700 completes the molding of the core 20 by applying heat to the molding sand 10 injected therein. As shown in FIG. 14 , when the forming of the core 20 is completed, the hollow forming rod 930 is formed by the operation of the moving cylinder 940 of the hollow part forming part 900 to the front middle metal mold 600 and the rear middle metal mold 600 . The insert is released from the mold-closed lower surface of the mold 700 and is exposed to the outside.

As shown in FIG. 15 , as the rear moving frame 500 moves backward, the rear middle mold 700 also moves backward, and the front of the rear middle mold 700 is the rear of the front middle mold 600 and it's cracked At this time, the molded core 20 is positioned in the front middle mold 600 , and the front rotating frame 400 together with the front middle mold 600 to take out the core 20 is moved forward so as to be in a horizontal state. As shown in FIG. 16, the fixing pin cylinder 842 of the vertical state fixing part 840 must be released before rotating it.

As shown in FIG. 17, the front rotating frame 400, which is in the vertical state of FIG. 15, is rotated forward by operating the rotation operation unit 800 to be in a horizontal state, and accordingly, the front middle mold 600 is also rotated forward. becomes horizontal. As shown in FIGS. 17 and 18 , the operator in the front can easily take out the molded core 20 from the front middle mold 600 that has been rotated forward to become a horizontal state, and as shown in FIG. 19 , It is possible to manufacture the molded core 20 in which the hollow part 22a is formed.

As described above, the core forming apparatus for casting according to the present invention includes the core 20 molded from the front middle metal mold 400 with respect to the operator in the front through the front rotating frame 400 and the rotating operation unit 800 . It is configured to be easily taken out to prevent damage to the core 20 and improve the convenience of work, and in particular, a separate hollow part ( 22a) There is an effect of improving productivity and guaranteeing uniformity of quality by molding the core 20 so that the hollow portion 22a is formed together without performing an operation.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical spirit of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can improve and change the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the protection scope of the present invention as long as they are apparent to those of ordinary skill in the art.

10 : Caster
20: middle character 21: scroll part
22: exhaust runner part 22a: hollow part
100: device frame 110: hopper
120: casting sand supply part 121: casting sand sending part
122: casting sand injection part 123: scraper part
200: front frame 210: opening
300: rear frame
400: forward rotation frame
500: rear moving frame
600: front middle fund type 610: casting sand inlet
620: upper cavity 630: lower cavity
700: rear middle fund type
800: rotation operation unit 810: rotation center shaft
820: rotating cylinder 821: bracket
830: cylinder rod 840: vertical state fixing part
841: rotation limiting member 842: fixing pin cylinder
842a: position fixing pin 842b: position fixing groove
900: hollow part forming part 910: fixed plate
920: moving plate 930: hollow forming rod
940: moving cylinder

Claims (9)

A device frame having a hopper in which the molding sand is stored thereon, a molding sand supply unit for receiving and transporting the molding sand from the hopper is installed, a front frame fixed to the front of the device frame in the shape of a rim having an opening, and the device frame A rear frame fixed to the rear side, a lower portion is rotatably installed inside the opening of the front frame, and a front rotation frame that rotates to have a vertical state with an upper end facing upward and a horizontal state with the upper end facing forward; A rear moving frame installed at the rear of the front rotating frame so as to be movable back and forth so as to be close to or spaced apart from the front rotating frame, and a front middle mold fixedly installed on the rear side of the front rotating frame to rotate together with the front rotating frame; It is fixedly installed on the front surface of the rear moving frame so as to move forward and backward together with the rear moving frame, and the front is molded with the rear of the front middle mold when the mold is closed or molded while the molding sand is injected from the molding sand supply unit. It includes a money mold and a rotation operation unit for rotating the front rotation frame in a vertical state and a horizontal state,
The rotating operation unit,
A pair of rotational central axes coaxially installed on the lower left and right sides of the front frame so as to be rotatable on the left and right sides of the opening of the front frame, and a rotatably pin-coupled rotation at the lower portion of the front frame through a bracket A cylinder and an exposed end operable to be drawn in and out of the rotary cylinder are rotatably pin-coupled through the central lower portion of the front rotary frame, and when drawn out from the rotary cylinder, the front rotary frame is rotated in a vertical state , A cylinder rod for rotating the front rotating frame in a horizontal state when entering into the rotating cylinder, and a vertical state for fixing the position of the front rotating frame in a vertical state when the front rotating frame becomes vertical by the operation of the rotating cylinder including a fixing part;
The vertical state fixing part,
A rotation limiting member having one end fixedly coupled to the left front side of the front rotating frame, and the other end protruding in the left direction of the front rotating frame to contact the left front surface of the front frame when the front rotating frame is in a vertical state;
A position fixing pin which is fixedly installed along the circumferential surface of the front rotation frame and operates so as to be retractable is inserted into the position fixing groove recessed in the inner surface of the front frame when withdrawing the front rotation frame with respect to the front frame. A core forming apparatus for casting, characterized in that it comprises a fixing pin cylinder for fixing the position in a vertical state.
According to claim 1,
The hopper is
It is fixedly installed on the rear upper part of the device frame,
The casting sand supply unit,
a casting intermission unit which is installed movably back and forth on the upper part of the device frame and receives the molding sand from the hopper when moving backward;
It is fixedly installed on the upper part of the device frame in front of the hopper so as to correspond to the position where the front middle mold and the rear middle mold are molded, and when the casting transfer part moves forward, the casting sand supplied to the inside of the casting sand transfer part The core molding apparatus for casting, characterized in that it comprises a molding sand injection part for injecting by pressing into the mold-closed inside of the front middle mold and the rear middle mold.
3. The method of claim 2,
The casting sand supply unit,
It is installed in front of the casting sand transfer part, and the front middle mold and the rear middle mold mold are molded among the molding sands which are injected by pressing into the molded inside of the front middle mold and the rear middle mold through the molding sand supply part. Core forming apparatus for casting, characterized in that it further comprises a scraper for sweeping away the excess casting sand remaining on the upper surface.
delete delete delete According to claim 1,
The middle is
A manifold-integrated turbine housing casting core, comprising a scroll unit corresponding to the turbine housing and a plurality of exhaust runner units corresponding to the manifold,
Each of the exhaust runner parts,
A core forming apparatus for casting, characterized in that a hollow part is formed inside in the shape of a pipe.
8. The method of claim 7,
The front middle money type is,
The upper cavity connected to the upper molding sand inlet corresponds to the scroll part of the core, and the lower cavity corresponds to the exhaust runner part of the core,
A core forming apparatus for casting, characterized in that it comprises a hollow part forming part for forming a hollow part therein so as to have a pipe shape when the exhaust runner part of the core is molded.
9. The method of claim 8,
The hollow part forming part,
a fixed plate fixedly installed to be spaced apart from the lower part of the front middle mold;
a movable plate installed movably to approach or spaced apart toward the lower surface of the front middle mold with respect to the fixed plate;
Each end is fixedly coupled to the moving plate so as to move together with the moving plate, and the other end is inserted when the moving plate is close to the lower surface of the front middle mold, and the movable plate is of the front middle mold. A plurality of hollow forming rods exposed to the outside when spaced apart from the lower surface,
A core forming apparatus for casting, which is installed on the fixed plate and includes a moving cylinder for moving the moving plate.

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