JP2006255776A - Apparatus and method for producing cast product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for casting a cast product by which molten metal running performance and yield rate are improved by charging the molten metal into every corner in a cavity. <P>SOLUTION: A metallic mold 6 is formed with an upper-side mold plate 6a and a lower-side mold plate 6b, and the cavity 13 is formed in the metallic mold 6. In the lower-side mold plate 6b, a mold plate movable part 6c by which a part of the cavity surface can be moved in the direction changing the cavity volume to the rest cavity surface, is arranged. When the molten metal 17 is cast, the mold plate movable part 6c is moved in the direction for increasing the cavity volume, and after pouring the molten metal, the volume in the cavity is returned back to the volume corresponding to the size of the cast product to the volume in the cavity by moving to the direction for reducing the volume of the cavity 13 before solidifying. In this way, the excessive molten metal once poured into the cavity 13, is discharged, and the molten metal 17 in the cavity at this time is pressurized and spread into every corners in the cavity 13. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a casting product manufacturing apparatus and a manufacturing method for forming a cast product by casting a molten metal or alloy into a cavity formed in a mold.

  An apparatus that forms a casting by casting a molten metal or alloy into a metal mold (hereinafter referred to as a mold) is called a casting apparatus. In particular, the casting is performed by casting the molten metal into the mold by gravity without applying pressure. The apparatus for manufacturing the is called a gravity casting apparatus. FIGS. 5A to 5E are views showing a method for manufacturing a cast product using such a gravity casting apparatus.

  In FIG. 5A, a casting cavity 43 is formed by joining an upper mold plate 36a and a lower mold plate 36b. In the cavity 43, for example, three enlarged diameter portions 43a and three reduced diameter portions 43b are alternately formed from the left side to the right side in the drawing, and the tip of the left enlarged diameter portion 43a is tapered. Tapered to. On the other hand, the diameter-reduced portion 43b at the right end has a cylindrical portion 43c that is thinner than the reduced-diameter portion 43b that extends toward the right side in the drawing, and this cylindrical portion 43c communicates with the gate. A molten metal reservoir 46 for temporarily storing the molten metal is provided at the gate of the mold 36. This cavity 43 is for rod casting, for example.

  Two extrusion pins 45 and one return pin 44 are provided so as to penetrate the upper mold plate 36a and the lower mold plate 36b, respectively. The push pin 45 and the return pin 44 are provided on the upper side of the upper mold plate 36a. And a double structure extrusion plate 49 disposed on the lower side of the lower mold plate 36b, respectively.

  After the upper mold plate 36 a and the lower mold plate 36 b are joined to form the cavity 43, a molten metal 47 of, for example, aluminum or an aluminum alloy (hereinafter simply referred to as aluminum) is placed in the molten metal storage portion 46 attached to the gate portion of the cavity 43. Inject. After injecting the molten aluminum 47 into the molten metal reservoir 46, when the mold 36 is inclined about 30 degrees with respect to the horizontal, as shown in FIG. 5B, for example, the molten aluminum in the molten metal reservoir 46 When the injection of 47 into the cavity 43 is started and then the mold 36 is further tilted, the molten metal 47 in the molten metal reservoir 46 is injected into the cavity 43. Finally, the mold 36 is placed in a vertical state, and casting of the molten aluminum 47 into the cavity 43 is completed (FIG. 5C).

  In this state, the molten aluminum 47 cast into the cavity 43 is solidified. After the molten metal is solidified, the mold 36 is returned to the horizontal state as shown in FIG.

  Thereafter, when the upper and lower mold plates 36a, 36b are moved along the return pin 44 in the direction of opening the parting line and the casting 48 is pushed out by the pushing pin 45, as shown in FIG. 5 (e). The mold 36 is opened and the casting 48 is collected.

  As a conventional technique related to such a gravity casting method, for example, JP-A-6-47517 (Patent Document 1) can be cited.

  6 (a) and 6 (b) are explanatory views showing a casting product manufacturing method in the prior art, FIG. 6 (a) is a cross-sectional view along the parting line of the mold, and FIG. It is sectional drawing orthogonal to a parting line. 6 (a) and 6 (b), the cast product is manufactured as follows.

  That is, after the mold A is closed together with the fixed mold a and the movable mold b, the gas in the cavity 52 is sucked from the vent hole 51 to decompress the inside of the cavity 52, and in this state, the molten metal is injected from the gate 53. To do. The molten metal is cast into the cavity 52 by gravity through the runner.

  After casting the molten metal, the pressure cylinder 54 is operated to apply pressure to the molten metal in the cavity 52 by the pressurizer 55, and in this state, the molten metal is solidified and left to stand until the product is cast. According to such a conventional technique, a cast product with higher dimensional accuracy can be obtained by a pressurizing effect on the cast product.

JP-A-6-47517

  However, the above prior art has the following problems. That is, when manufacturing a thin cast product, since the cooling rate of the molten metal cast into the mold is high, the molten metal can be sufficiently filled into the narrowed portion of the cavity or the corners of the thick portion. However, there is a problem that the hot water circulation performance and the yield rate are lowered.

  FIG. 4 shows a cooling rate curve of the molten metal cast in the cavity in the casting apparatus. In FIG. 4, when the thickness of the cast product is 30 mm, it takes about 60 seconds until the molten metal temperature reaches 570 ° C. after casting the molten metal, and after that, 570 ° C. is maintained for about 20 seconds. Yes. On the other hand, when the wall thickness is 20 mm, after casting the molten metal, the temperature falls to 570 ° C. in about 40 seconds, and then maintained at 570 ° C. for 15 seconds, and then the temperature is rapidly lowered to cast the molten metal. After 70 seconds, the temperature dropped to 500 ° C. On the other hand, when the wall thickness is 10 mm, the temperature drops to 570 ° C. in 20 seconds after the casting of the melt, and the melt temperature decreases to 500 ° C. after 40 seconds. Thus, when manufacturing a thin cast product, since the molten metal temperature falls rapidly, it becomes difficult to fill a molten metal especially to the narrow part in a cavity or the corners of a thick part.

  The present invention has been made in view of such a problem, and fills up the corners of the narrowed portion or the end of the thick portion of the cavity to improve the meltability and improve the yield rate of the melt. An object of the present invention is to provide an apparatus and a method for manufacturing a cast product that can be produced.

  The casting product manufacturing apparatus according to the present invention is a casting product manufacturing apparatus that forms a casting product by casting a molten metal or alloy into a cavity formed in a mold formed by joining a pair of mold plates. The mold plate has a cavity surface that forms the cavity, and at least one of the mold plates has a mold plate movable portion that moves in a direction in which a part of the cavity surface changes the volume of the cavity with respect to the remaining portion. It is characterized by having.

  In this case, it is preferable that the template moving part is supported on an extrusion plate different from the extrusion plate on which an extrusion pin for extruding a cast product is supported.

  Moreover, it is preferable that the said template movable part and the template which has this template movable part are formed so that a movement with respect to the other template is possible.

  Furthermore, the molten metal can be cast into the cavity by gravity.

  Furthermore, it is preferable that the mold plate movable part is provided on a mold plate which is a lower side when casting a molten metal.

  Furthermore, the molten metal can be a molten aluminum or aluminum alloy.

  The method for producing a cast product according to the present invention is a method for producing a cast product in which a molten metal or alloy is cast into a cavity formed in a mold formed by joining a pair of mold plates, and the cast product is formed. The mold plate has a cavity surface that forms the cavity, and at least one of the mold plates has a mold plate movable portion that moves in a direction in which a part of the cavity surface changes the volume of the cavity with respect to the remaining portion. The mold volume moving part is moved after the molten metal is poured and before solidification to change the cavity volume.

  In this case, the step of moving the mold plate movable part before the molten metal injection to increase the cavity volume than the volume of the cast product, the step of changing the cavity volume before solidification after the molten metal injection, It is preferable that the cavity volume be returned to the casting volume.

  Moreover, it is preferable to have the process of taking out a cast product by moving the said mold plate movable part and the template which has this mold plate movable part in the direction separated from the other mold plate, after shape | molding the said cast product.

  Furthermore, the molten metal can be cast into the cavity by gravity.

  Furthermore, it is preferable that the mold plate movable part is provided on a mold plate which is a lower side when casting a molten metal.

  Furthermore, the molten metal can be a molten aluminum or aluminum alloy.

  According to the casting product manufacturing apparatus according to claim 1 of the present invention, since the mold plate movable portion that changes the cavity volume is provided, for example, before the molten metal is poured, the mold plate movable portion is moved to increase the cavity volume. For example, after injecting molten metal, by moving the movable part of the template before solidification to reduce the cavity volume, once the molten metal more than the required amount is injected into the cavity, the excess molten metal can be pushed out of the cavity. When the molten metal is extruded, the molten metal can be distributed to the narrowed portion or the end of the thick portion of the cavity, so that the hot water supply performance and the yield rate are improved.

  According to the casting product manufacturing apparatus according to claim 2 of the present application, it is possible to change the cavity volume by moving only the template moving part without operating the extrusion pin for extruding the casting product.

  According to the apparatus for manufacturing a cast product according to claim 3 of the present application, after casting the cast product, the mold plate movable portion and the template plate provided with the template plate movable portion are moved away from the other template plate. Since the parting line can be opened, the cast product can be easily taken out.

  According to the apparatus for manufacturing a cast product according to claim 4 of the present application, when the excess molten metal once injected into the cavity is pushed out of the cavity, the molten metal reaches every corner of the cavity. Even if it is a gravity casting machine that does not, the hot water performance is improved.

  According to the apparatus for manufacturing a cast product according to claim 5 of the present application, when the excess molten metal cast into the cavity is pushed upward and discharged out of the cavity, the molten metal is easily spread to every corner of the cavity. Rotation improves.

  According to the apparatus for manufacturing a cast product according to claim 6 of the present application, the castability of aluminum or aluminum alloy can be improved, and a cast product made of aluminum or aluminum alloy can be manufactured with a high yield.

  According to the method for manufacturing a cast product according to claim 7 of the present invention, for example, after casting the molten metal, by reducing the cavity volume before solidification, when the molten metal once cast into the cavity is pushed out of the cavity, Since the molten metal can be spread to the narrowed part or the thick part end of the cavity, the hot water circulation property and the yield rate are improved.

  According to the casting product manufacturing method according to claim 8 of the present application, the mold plate movable part is moved before pouring the molten metal to increase the cavity volume from the casting volume, and after the molten metal is poured, the cavity volume is cast before solidification. By returning to the volume of the product, the molten metal can be spread to the narrowed part or the end of the thick part of the cavity when the excess molten metal exceeding the volume of the casting once injected into the cavity is pushed out of the cavity. Therefore, the hot water circulation and the yield rate are improved.

  The casting product manufacturing method according to claims 9 to 12 of the present application relates to a casting product manufacturing method using the casting product manufacturing device according to claims 3 to 6, respectively, and a corresponding casting product manufacturing device. Has the same effect as.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 and 2 are explanatory views showing a gravity casting apparatus according to the present embodiment, in which FIG. 1A is a front view and FIG. 1B is a left side view of FIG. 2 (a) to 2 (e) are views showing the main part of FIG. 1, and are cross-sectional views showing mold parts along the casting process.

  In FIG. 1A, a casting machine main body 1 of this gravity casting apparatus is placed on a gantry 2 and configured to be tiltable from an upright state to a horizontal state. A rectangular movable side mounting plate 3 and a fixed side mounting plate 4 are respectively disposed at the upper and lower ends of the casting machine body 1, and the movable side mounting plate 3 and the fixed side mounting plate 4 are respectively disposed at the four corners. The four tie bars 5 are connected.

  An upper mold plate 6 a and a lower mold plate 6 b are provided between the movable side mounting plate 3 and the fixed side mounting plate 4. Through holes are respectively formed at four corners of the upper mold plate 6a and the lower mold plate 6b, and four tie bars 5 are inserted into the through holes, respectively. The upper mold plate 6 a and the lower mold plate 6 b are provided so as to be movable up and down along the tie bar 5.

  The upper mold plate 6a is supported by an upper mold clamping cylinder 8 that extends upward through the movable mounting plate 3, and the lower mold plate 6b extends through the fixed mounting plate 4 and extends downward. It is supported by the cylinder 9. The upper mold clamping cylinder 8 moves the upper mold plate 6 a up and down along the tie bar 5, and the lower mold clamping cylinder 9 moves the lower mold plate 6 b up and down along the diver 5.

  A cavity for molding a cast product is formed on the joint surface between the upper mold plate 6a and the lower mold plate 6b, and a cast product is manufactured by casting molten metal into the cavity.

  The casting machine main body 1 is rotatably supported by a tilting shaft 12 supported by a pair of bearings 11 provided at one end of a gantry 2. The central portion of the casting machine body 1 in the longitudinal direction and the gantry 2 are connected by a tilting cylinder 10, and the connecting portion between the tilting cylinder 10 and the casting machine main body 1 and the connecting portion between the tilting cylinder 10 and the gantry 2 are respectively provided. Thus, the casting machine body 1 rotates about the tilting shaft 12 as the tilting cylinder 10 expands and contracts, and tilts between the vertical state and the horizontal state with respect to the gantry 2. It is configured.

  In FIG. 1B, the tilt shaft 12 is supported by bearings 11 on both the left and right sides, and the fixed side mounting plate 4 of the casting machine body 1 is rotatably supported by the tilt shaft 12. Four tie bars 5 are arranged at the four corners of the fixed side mounting plate 4, and the fixed side mounting plate 4 is connected to the upper fixed side mounting plate 3 (not shown) via the four tie bars 5. Yes. A lower mold clamping cylinder 9 is provided at substantially the center of the fixed side mounting plate 4 so as to penetrate the fixed side mounting plate 4.

  As shown in FIG. 2A, the mold part of the casting machine main body 1 is formed by the upper mold plate 6a and the lower mold plate 6b, and the cavity 13 is formed in the mold 6. Is done. In the cavity 13, for example, three enlarged diameter portions and three reduced diameter portions are alternately formed from the left side to the right side in the drawing, and the distal end portion of the left enlarged diameter portion is tapered. ing. On the other hand, the reduced diameter portion at the right end has a runner as a cylindrical portion that is thinner than the reduced diameter portion extending toward the right side in the figure, and this runner is in communication with the gate 21.

  The lower mold plate 6b is a double-structured mold. In this lower mold plate 6b, a part of the cavity surface is changed in the direction in which the internal volume of the cavity 13 is changed with respect to the remaining cavity surface, that is, A template movable portion 6c formed so as to be movable in the vertical direction in FIG. 2A is provided.

  The template movable portion 6c is supported by a second extrusion plate 20 that is different from a first extrusion plate 19 described later, on which an extrusion pin 15 that extrudes the cast product after molding is supported. The mold plate movable portion 6c is configured to slide in the lower mold plate 6b in the vertical direction in FIG. 2A by moving the second push plate 20 by, for example, a hydraulic cylinder (not shown).

  For example, two extruding pins 15 are provided in the upper mold plate 6a and the template movable section 6c so as to penetrate the mold plate portion vertically, and the upper mold plate 6a and the lower mold plate 6b are respectively arranged in the upper and lower directions. For example, a single return pin 14 is provided so as to penetrate through. The upper push pin 15 and the return pin 14 are fixed to a double structure push plate 19 disposed on the upper side of the upper mold plate 6a. On the other hand, the lower extruding pin 15 and the return pin 14 are fixed to an extruding plate 19 having a double structure disposed further below the second extruding plate 20 disposed below the lower mold plate 6. . The lower extrusion plate 19 is supported by the pressure plate 22. In the present embodiment, the pressing plate 22 is fixed to the lower extrusion plate 19.

  A molten metal storage portion 16 for temporarily storing the molten metal is provided at the pouring gate 21 portion of the cavity 13, and, for example, a molten metal 17 of aluminum is poured into the molten metal storage portion 16. The molten metal 17 is injected into the cavity 13 by inclining the mold 6. The cavity 13 is for rod casting, for example.

  When casting the molten metal 17 into the cavity 13, the second extrusion plate 20 is previously moved downward in FIG. 2A by a hydraulic cylinder (not shown), whereby the mold plate movable portion 6 c of the lower mold plate 6 b is moved. The cavity 13 is moved downward to make the inner volume of the cavity 13 larger than the volume corresponding to the casting 18. In this state, as shown in FIG. 2B, for example, when the mold 6 is inclined about 30 degrees with respect to the horizontal, injection of the molten aluminum 17 into the cavity 13 starts.

  Thereafter, when the mold 6 is further tilted, the molten metal 17 in the molten metal reservoir 16 is poured into the cavity 13. Finally, the mold 6 is placed in a vertical state, and the casting of the molten aluminum 17 into the cavity 13 is completed (FIG. 2C).

  After the injection of the molten metal 17 into the cavity 13 is completed, the second pushing plate 20 is operated before the molten metal 17 is solidified, so that the inner volume of the cavity 13 decreases in the mold plate movable portion 6c, that is, FIG. c) Move in the middle left direction to return the internal volume of the cavity 13 to the volume corresponding to the size of the casting 18. At this time, the 2nd extrusion board 20 which supports the template movable part 6c will be in the state contact | abutted to the edge part of the lower mold plate 6b.

  When the inner volume of the cavity 13 is returned to a size corresponding to the size of the cast product 18 by moving the template moving part 6c, the cavity 13 is once injected into the cavity 13 having a volume larger than the volume corresponding to the cast product 18. The molten metal is pressed by the template moving part 6c that moves in the direction of decreasing the internal volume of the cavity 13, and the excess molten metal is further pushed out to receive the excessive molten metal provided separately from the product casting cavity. Is stored in a cavity (not shown). At this time, the molten metal 17 in the cavity is pressurized by the movement of the template movable part 6c, and the molten metal 17 reaches every corner of the molding cavity.

  After casting the molten metal 17 into the cavity 13 in this way, the mold is allowed to stand, and after the molten metal has solidified, the mold 6 is returned to the horizontal state as shown in FIG. 6b is lowered together with the mold plate movable part 6c, and when the pressing plate 22 is raised and the pushing pin 15 supported by the lower pushing plate 19 is pushed out, the cast product 18 is released from the lower die plate 6b.

  Thereafter, when the push pin 15 of the upper mold plate 6a is pushed downward in the figure, the cast product 18 is completely released as shown in FIG. 2 (e) and collected as a product.

  Hereinafter, the operation of the casting apparatus for the cast product of the present embodiment configured as described above will be described. When starting casting, first, the tilting cylinder 10 of FIG. 1 is extended to return the casting machine body 1 to the vertical initial state. In this state, the cavity 13 is formed by bringing the upper mold plate 6a and the lower mold plate 6b into contact with each other.

  In this embodiment, after the molten metal is injected and before the solidification, the template movable portion 6c is moved to change the volume of the cavity 13. First, before the molten metal 17 is injected into the cavity 13, FIG. As shown, the second pushing plate 20 is operated to move the template moving portion 6c downward relative to the lower die plate 6b, so that the internal volume of the cavity 13 is larger than the size corresponding to the casting 18. Use a large volume. Next, molten aluminum 17 is poured into the molten metal storage section 16. At this time, the molten aluminum 17 has a sufficient amount to fill the cavity 13 whose internal volume is increased.

  When the mold 6 having a volume larger than the size corresponding to the casting 18 is inclined by 30 ° with respect to the horizontal state as shown in FIG. Injection into the body begins.

  Thereafter, when the mold 6 is further tilted, the molten metal 17 in the molten metal reservoir 16 is further injected into the cavity 13. Finally, the mold 6 is placed in a vertical state, and the casting of the molten aluminum 17 into the cavity 13 is completed (FIG. 2C).

  After the injection of the molten metal 17 into the cavity 13 is completed, the mold plate movable portion 6c is slightly moved toward the upper mold plate 6a to change the volume of the cavity 13 before the molten metal 17 is solidified. That is, the second pushing plate 20 is operated to move the template movable portion 6c in the direction in which the inner volume of the cavity 13 decreases, so that the inner volume of the cavity 13 is returned to the volume corresponding to the size of the casting 18 (FIG. 2). (C)).

  The timing at which the mold plate movable portion 6c is moved to return the internal volume of the cavity 13 to the volume corresponding to the size of the casting 18 is an elapsed time from the start of the molten metal casting to the completion of the casting, for example, molten metal casting. The time is 10 seconds after the start. In this case, after casting the molten metal, when the mold surface temperature of the fastest cooled portion reaches about 560 ° C., the mold plate movable portion 6c is moved so that the inner volume of the cavity 13 corresponds to the casting 18. You may make it become.

  The mold temperature at the time of casting the molten metal is usually 300 to 400 ° C. However, in the case of a cast product in which the thick part and the thin part are adjacent, in order to prioritize cooling of the thick part, for example, The mold temperature may be 250 ° C. or lower. Further, when the molten metal flows in the vicinity of the surface of the mold and is injected into the tip of the mold, the rate of decrease in the molten metal temperature is increased. In consideration of such a situation, as described above, the mold temperature is set to about 560 ° C. as a timing other than the time when the mold movable portion 6c is moved and the inner volume of the cavity 13 is made to correspond to the casting 18. The time when it became. However, the timing of returning the inner volume of the cavity 13 to the volume corresponding to the size of the casting product 18 by moving the template moving part 6c after the molten metal is poured is not particularly limited, and is cast into the cavity 13. It may be performed before the molten metal 17 is solidified.

  As described above, after the injection of the molten metal 17 into the cavity 13 is started, the interval from when the mold plate movable portion 6c is moved to return the internal volume of the cavity 13 to the size corresponding to the cast product 18 is defined as time. The melt 17 does not solidify during this time, and the melt 17 maintains a liquid or semi-solid state.

  Therefore, when the inner volume of the cavity 13 is returned to a size corresponding to the size of the cast product 18, the excess molten metal once injected into the cavity 13 having a volume larger than the volume corresponding to the cast product 18 is pushed out. And stored in a cavity (not shown) for receiving excess molten metal provided separately from the product casting cavity. At this time, the molten metal 17 in the cavity 13 is pressurized by the movement of the template moving part 6 c to reduce the internal volume of the cavity 13, and the molten metal 17 reaches every corner of the cavity 13.

  The molten metal 17 is allowed to stand in a state where it is spread over every corner of the cavity 13, and the molten aluminum 17 cast into the cavity 13 is solidified to obtain a cast product 18. After the molten metal 17 has solidified, as shown in FIG. 2D, the mold 6 is returned to the horizontal state, the lower mold plate 6b is lowered together with the template movable portion 6c, and the extrusion corresponding to the template movable portion 6c is performed. When the extrusion pin 15 supported by the plate 19 is pushed out, the cast product 18 is released from the lower mold plate 6b and the template movable portion 6c.

  Thereafter, the extrusion plate 19 corresponding to the upper mold plate 6a is moved to push the extrusion pin 15 downward in the figure, and as shown in FIG. 2 (e), the cast product 18 is completely released and recovered as a product. .

  According to the present embodiment, the lower mold plate 6b is provided with the mold plate movable portion 6c that can move a part of the cavity surface in the direction in which the volume of the cavity 13 changes. After the casting of the molten metal is finished, the mold plate movable portion 6c is returned before the molten metal is solidified, and the internal volume of the cavity 13 is returned to a size corresponding to the casting 18. Since it did in this way, the molten metal 17 reaches every corner of the cavity 13 by the applied pressure when the excessive molten metal 17 once injected into the cavity 13 is pushed out. Accordingly, the hot-rollability is improved, the yield rate of the molten metal is improved, and the internal nest in the molten metal is reduced, so that a good cast product can be obtained.

  Moreover, according to this embodiment, since the template movable part 6c was supported by the 2nd extrusion board 20 different from the 1st extrusion board 19 with which the extrusion pin 15 which extrudes a casting is supported, the extrusion pin 15 and Separately, only the template movable part 6c is moved to adjust the inner volume of the cavity 13, thereby improving the hot water supply.

  Furthermore, according to the present embodiment, the mold temperature can be lowered by, for example, 20 to 30 ° C. from the conventional 300 to 400 ° C. by improving the hot water circulating property, and the molten metal temperature is 5 to 10 ° C. Can be lowered. As a result, the lead time until the casting production, which has conventionally required about 5 minutes, can be shortened, for example, by 10 to 20 seconds. Further, since the casting cooling rate is relatively high, the DAS (dent light arm spacing) of the internal structure becomes dense and the product strength is improved.

  Furthermore, according to the present embodiment, as a countermeasure against hot water, it is possible to eliminate the need for a heat insulating material such as ceramic that has been conventionally disposed in a mold portion corresponding to a thin portion or a narrow portion of a cavity.

  FIG. 3 is a cross-sectional view showing a modification of the above-described embodiment, and shows a process corresponding to FIG. In the above-described embodiment, the pressing plate 22 that supports the extrusion plate 19 that is downward in FIG. 2A is fixed to the extrusion plate 19, but in the modification shown in FIG. The pressing plate 22 is provided so as to be movable in the moving direction of the template movable portion 6c via a protruding portion protruding outward of the second extrusion plate 20 that supports the template movable portion 6c. It can be moved separately from 19.

  Then, as shown in FIG. 2 (b), after pouring of the molten metal is started, the mold is brought into a vertical state as shown in FIG. 3, and the second extrusion plate 20 together with the first extrusion plate 19 is placed on the lower mold plate. The second extrusion plate 20 is brought into contact with the lower mold plate 6b. The pressing plate 22 remains in its original position. As a result, the movable mold plate 6c moves toward the upper mold plate 6a, and the first extruding plate 19 also moves toward the lower mold plate 6b, so that the extruding pin 15 and the return pin 14 also move into the cavity 13. Move towards. As a result, the movable mold plate 6c moves while the tip of the push pin 15 is flush with the surface of the movable mold plate 6c, so that the molten metal is inserted into the push mold pin 15 in the movable mold plate 6c as the movable mold plate 6c moves. Intrusion into the hole can be prevented. Also in this modified example, the volume of the cavity 13 decreases due to the movement of the movable mold plate 6c toward the upper mold plate 6a, so that the hot metal effect acts on the molten metal and a high quality ingot can be obtained.

  After the molten metal is solidified, as shown in FIG. 2 (d), the mold is placed in a horizontal state, the lower mold plate 6b and the movable mold plate 6c are lowered, and the pressing plate 22 is moved to the lower mold plate 6b and the movable mold plate 6c. The first pusher plate 19 is raised until it abuts on the second pusher plate 20 or the vicinity thereof by raising it relatively, and the pusher pin 15 and the return pin 14 are moved to the movable die plate 6c and the lower die, respectively. The casting product 18 is extruded from the movable mold plate 6c and the lower mold plate 6b by the extrusion pin 15 so as to protrude relatively upward from the plate 6b. Thereby, the casting 18 is released. Thus, in this modified example, in addition to the same effects as those of the above embodiment, it is possible to prevent the molten metal from entering the hole of the movable mold plate 6c into which the push pin 15 is inserted. There is an effect.

  In each of the above embodiments and modifications, when casting the molten metal 17 into the cavity 13, the mold plate movable portion 6 c of the lower mold plate 6 b is moved downward in advance so that the internal volume of the cavity 13 corresponds to the cast product 18. However, the present invention is not limited to this, and at the same time as the molten metal 17 starts to be cast into the cavity 13, the mold plate movable portion 6 c of the lower mold plate 6 b is moved downward. Thus, the inner volume of the cavity 13 can be made larger than the volume corresponding to the casting 18.

  Moreover, in the said embodiment, although the case where the molten metal receiving cavity (illustration omitted) for receiving the excess molten metal 17 once inject | poured in the cavity 13 was provided in the metal mold | die was demonstrated, this invention is limited to this. Instead of providing a molten metal receiving cavity, the runner portion connecting the cavity 13 and the molten metal storage portion 16 is thickened, and excess molten metal pushed out of the cavity 13 by the movement of the template movable portion 6c is heated. You may make it store in a road part.

  The apparatus and method for manufacturing a cast product according to the present invention can fill the molten metal into every corner of the narrowed part or the thick part end in the cavity, thereby improving the hot-rollability and the yield rate of the molten metal. And is useful in the casting field, particularly in the gravity casting field.

It is a figure which shows the gravity casting apparatus which concerns on embodiment of this invention. It is sectional drawing which shows the metal mold | die part of the gravity casting apparatus which concerns on embodiment of this invention, and shows operation | movement of embodiment. It is sectional drawing which shows the modification in operation | movement of the gravity casting apparatus which concerns on embodiment of this invention. It is a figure which shows the relationship between the thickness of a casting, and the temperature fall of a molten metal. It is explanatory drawing of a prior art. It is explanatory drawing of a prior art.

Explanation of symbols

1: Casting machine main body 2: Stand 3: Movable side mounting plate 4: Fixed side mounting plate 5: Tie bar 6: Mold 6a: Upper die plate 6b: Lower die plate 6c: Mold plate movable portion 8: Upper die clamping cylinder 9: Lower clamping cylinder 10: Tilt cylinder 11: Bearing 12: Tilt shaft 13: Cavity 14: Return pin 15: Extrusion pin 16: Molten reservoir 17: Molten metal 18: Cast product 19: First extruded plate 20: No. 2 Extruding plate 21: Pouring gate 36: Mold 36a: Upper die plate 36b: Lower die plate 43: Cavity 43a: Expanded portion 43b: Reduced diameter portion 43c: Cylindrical portion 44: Return pin 45: Extruding pin 46: Molten metal storage Portion 47: Molten metal 48: Cast product 49: Extruded plate 51: Vent hole 52: Cavity 53: Pouring gate 54: Pressure cylinder 55: Pressurizer

Claims (12)

  In a casting production apparatus for casting a molten metal or alloy into a cavity formed in a mold formed by joining a pair of mold plates, the mold plate has a cavity surface that forms the cavity. And at least one mold plate has a mold plate movable portion in which a part of the cavity surface moves in a direction to change the volume of the cavity with respect to the remaining portion. .   The apparatus for manufacturing a cast product according to claim 1, wherein the template moving part is supported by an extruding plate different from the extruding plate on which an extruding pin for extruding the cast product is supported.   The apparatus for manufacturing a cast product according to claim 1 or 2, wherein the mold plate movable portion and the mold plate having the mold plate movable portion are formed to be movable with respect to the other mold plate.   The said molten metal is cast in a cavity by gravity, The manufacturing apparatus of the cast goods of any one of the Claims 1 thru | or 3 characterized by the above-mentioned.   The said template moving part is provided in the template which becomes the lower side at the time of molten metal casting, The manufacturing apparatus of the cast product of Claim 4 characterized by the above-mentioned.   The apparatus for producing a cast product according to any one of claims 1 to 5, wherein the molten metal is a molten metal of aluminum or an aluminum alloy.   In a method for manufacturing a cast product, in which a molten metal or alloy is cast into a cavity formed in a mold formed by joining a pair of mold plates, a cast product is formed. The mold plate has a cavity surface that forms the cavity. And at least one of the mold plates has a mold plate movable portion in which a part of the cavity surface moves in a direction to change the volume of the cavity with respect to the remaining portion. A method for producing a cast product, wherein the cavity volume is changed by moving the template moving part.   The step of moving the mold plate moving part before pouring the molten metal to increase the cavity volume to be larger than the volume of the cast product, and the step of changing the cavity volume before solidification after pouring the molten metal, 8. The method for producing a cast product according to claim 7, wherein the method is a step of returning to the volume of the cast product.   2. The method according to claim 1, further comprising a step of removing the cast product by moving the mold plate movable part and the mold plate having the mold plate movable part in a direction away from the other mold plate after forming the cast product. A method for producing a cast product according to 7 or 8.   The method for manufacturing a cast product according to claim 7, wherein the molten metal is cast into the cavity by gravity.   The method for manufacturing a cast product according to claim 10, wherein the mold plate movable portion is provided on a mold plate which is a lower side when casting a molten metal. The method for producing a cast product according to any one of claims 7 to 11, wherein the molten metal is a molten aluminum or aluminum alloy.

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