JP2015155113A - Casting method, and casting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a casting method capable of surely forming a metal member having a desired shape.

SOLUTION: An insert pin 13 and a casting die-release agent feeding part 30 are arranged in a first casting die part 11 of a casting device. In an end part of the insert pin 13 projecting to an inner space 100, a plurality of discharge holes 131 capable of discharging a casting die-release agent into the inner space 100 are provided. The casting die-release agent feeding part 30 is equipped with a first valving element 31, a valve member 40 or the like. When a molten metal is fed into the inner space 100, the casting die-release agent feeding part 30 discharges the casting die-release agent in a passage 130 into the inner space 100 via the discharge holes 131. Thereby, a film of the casting die-release agent is formed between the molten metal in the inner space 100 and an outer wall 132 of the insert pin 13 to surely cut off the molten metal from the outer wall 132. Accordingly, when the formed metal member is separated from a casting die of the casting apparatus after the molten metal is consolidated, the metal member can be surely separated from the casting die without generating a problem such as deformation of the metal member.

COPYRIGHT: (C)2015,JPO&INPIT

Description

  The present invention relates to a casting method and a casting apparatus.

  In a casting method in which a metal member having a desired shape is formed by filling and solidifying a molten metal, which is a metal having a temperature higher than the melting point, in the mold, the mold is formed and contacted with the molten metal. A mold release agent that secures lubrication between the metal mold and the molten metal is applied to the metal member molding surface that may be in danger. For example, Patent Document 1 includes a mold release agent supply unit that is connected to a runner formed between a sleeve of a metal melt supply unit that supplies metal melt to the inside of the mold and the mold, A casting apparatus is described in which a release agent is supplied into the mold in a closed state, and then a molten metal is supplied into the sleeve.

JP 2001-105112 A

  However, in the casting apparatus described in Patent Document 1, the application of the release agent to the metal member molding surface is completed before the molten metal is supplied into the mold, and the molten metal is supplied into the mold. Then, there exists a possibility that the mold release agent adhering to the metal member molding surface may be washed away. For this reason, when the molded metal member is separated from the mold, the metal member is deformed, or a metal compound is generated between the metal member and the metal member molding surface, so that the molded metal member is defective.

  An object of the present invention is to provide a casting method for reliably forming a metal member having a desired shape.

  The present invention is a casting method for solidifying a molten metal filled in a mold to form a metal member having a desired shape, between the metal member forming surface forming the interior of the mold and the molten metal. It includes a molten metal filling step of filling the molten metal into the mold while supplying the mold release agent.

  In the casting method of the present invention, the molten metal is supplied into the mold while supplying the release agent between the metal member forming surface and the molten metal. Thereby, the film | membrane of a mold release agent is formed between a metallic member shaping | molding surface and a molten metal, and it can interrupt | block the molten metal and a metallic member shaping | molding surface reliably. Therefore, when the metal member molded from the inside of the mold is removed after the molten metal is solidified, the metal member can be reliably separated from the mold without causing problems such as deformation of the metal member.

  The present invention is also a casting apparatus, a mold having a supply hole for supplying a mold release agent on a metal member molding surface in contact with the molten metal, and a molten metal supply unit for supplying the molten metal into the mold. And a release agent supply unit that has a first communication chamber that communicates with the supply hole and supplies the release agent to the supply hole through the first communication chamber.

  In the casting apparatus of this invention, it has the supply hole which can supply a mold release agent inside a metal mold | die in a metal member molding surface. When the molten metal is supplied into the mold, a release agent is supplied into the mold. Thereby, the film | membrane of a mold release agent is formed between a metal molten metal and a metal member shaping | molding surface, and it can interrupt | block reliably a metal member shaping | molding surface and a metal molten metal. Therefore, when the metal member molded from the inside of the mold is removed after the molten metal is solidified, the metal member can be reliably separated from the mold without causing problems such as deformation of the metal member.

It is a schematic diagram of the casting apparatus by 1st Embodiment of this invention. It is sectional drawing of the II section of FIG. It is the III section enlarged view of FIG. It is a flowchart of the casting method by 1st Embodiment of this invention. It is a characteristic view which shows the time change of the hot_water | molten_metal supply pressure of a molten metal, and the discharge pressure of a mold release agent in the casting method by 1st Embodiment of this invention. It is a schematic diagram explaining the process of the casting method by 1st Embodiment of this invention. It is a schematic diagram explaining the process of the casting method by 1st Embodiment of this invention, Comprising: It is a schematic diagram explaining the process different from FIG. It is a schematic diagram explaining the process of the casting method by 1st Embodiment of this invention, Comprising: It is a schematic diagram explaining the process different from FIG. It is a schematic diagram explaining the process of the casting method by 1st Embodiment of this invention, Comprising: It is a schematic diagram explaining the process different from FIG. It is a schematic diagram explaining the process of the casting method by 1st Embodiment of this invention, Comprising: It is a schematic diagram explaining the process different from FIG. It is sectional drawing of the mold release agent supply part which the casting apparatus by 2nd Embodiment of this invention has. It is the XII section enlarged view of FIG. It is a flowchart of the casting method by 2nd Embodiment of this invention. It is a schematic diagram explaining the process of the casting method by 2nd Embodiment of this invention.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
A casting method and casting apparatus according to a first embodiment of the present invention will be described with reference to FIGS.
In FIG. 1, the schematic diagram of the casting apparatus 1 by 1st Embodiment is shown. The casting apparatus 1 has a space in which a molten metal can be filled. The space is formed so that the molten metal to be filled has a desired shape, and a metal member having a desired shape is obtained by solidifying the supplied molten metal. The casting method according to the first embodiment is so-called die casting, and a molten metal is press-fitted into the casting apparatus 1 to form a metal member. The casting apparatus 1 includes a mold 10, a molten metal supply unit 20, a release agent supply unit 30, and the like. In FIG. 1, the upper side of the page is the “top” side, and the lower side of the page is the “ground” side.

  The mold 10 has an internal space 100 as “inside of the mold” filled with molten metal. In the mold 10 provided in the casting apparatus 1 according to the first embodiment, the internal space 100 is formed in a substantially rectangular parallelepiped shape. A telescopic pin 13 to be described later protrudes into the internal space 100. The internal space 100 communicates with a communication path 101 as “inside of the mold” communicating with the inside of the molten metal supply unit 20. Thereby, the casting apparatus 1 forms a substantially rectangular parallelepiped metal member having a depression at a portion corresponding to the insert pin 13 and having a protrusion formed at a portion corresponding to the communication path 101. However, the shape of the metal member formed in the casting apparatus of the present invention is not limited to this. The mold 10 includes a first mold part 11, a second mold part 12, a telescopic pin 13, and the like.

  The first mold part 11 is a metal member having a substantially U-shaped cross section so as to form a part of the internal space 100. The first mold part 11 has an insertion hole 111 through which the insertion pin 13 is inserted. On the ground side of the first mold part 11, there is provided a groove-like part that becomes a part of the inner wall of the communication path 101 formed when the first mold part 11 and the second mold part 12 are combined. ing.

  The second mold part 12 is a metal member having a substantially U-shaped cross section so as to form a part of the internal space 100. An insertion hole 121 into which the molten metal supply unit 20 is inserted is formed on the ground side of the second mold part 12.

  As shown in FIG. 2, the telescopic pin 13 is a metal member formed in a bottomed cylindrical shape. The insert pin 13 is inserted through the insertion hole 111 of the first mold part 11. The telescopic pin 13 has a passage 130 having a bottom surface at the end on the side protruding into the internal space 100 (see FIG. 2). The passage 130 can communicate with the inside of the release agent supply unit 30. A plurality of discharge holes 131 serving as “supply holes” that communicate with the passage 130 and the outside, that is, the internal space 100, are provided at the end on the side protruding into the internal space 100.

  The molten metal supply unit 20 supplies the molten metal into the mold 10. The molten metal supply unit 20 is formed of a sleeve 21, a plunger 22, and the like.

  The sleeve 21 is formed in a cylindrical shape. One end of the sleeve 21 is inserted into the insertion hole 121 of the second mold part 12 and fixed to the second mold part 12. The other end of the sleeve 21 has an opening 211 through which the plunger 22 is inserted. The side wall of the sleeve 21 has a supply port 212 through which the molten metal supplied into the sleeve 21 passes.

  The plunger 22 is provided on the inner wall of the sleeve 21 so as to be slidable. The plunger 22 pressurizes the molten metal supplied into the sleeve 21 and press-fits the molten metal into the internal space 100 and the communication path 101 of the mold 10.

  The release agent supply unit 30 supplies the release agent pressurized through the plurality of discharge holes 131 of the insert pin 13 into the mold 10. The release agent supply unit 30 includes a first valve body 31, a second valve body 32, a valve member 40, a drive unit 34, a release agent tank 35 as a “release agent storage unit”, and the like.

  The first valve body 31 is formed in a substantially cylindrical shape. The 1st valve body 31 is formed from the cylinder part 311 and the connection part 312 grade | etc.,. The first valve body 31 is fixed to the outer wall 112 of the first mold part 11 so as to be connected to the telescopic pin 13.

  The tubular portion 311 is formed in a tubular shape and has a through hole that penetrates the first valve body 31 in the direction of the central axis CA31 of the first valve body 31. The through hole communicates with the passage 130 of the telescopic pin 13. An intermediate member 316 is provided between the cylindrical portion 311 and the telescopic pin 13.

  The intermediate member 316 is formed in an annular shape, and connects the cylindrical portion 311 and the telescopic pin 13 via the seal members 314 and 315. The intermediate member 316 is formed with a through hole 318 that communicates the through hole of the cylindrical portion 311 and the passage 130 of the telescopic pin 13 at substantially the center.

  The connecting portion 312 is provided on the radially outer side of the cylindrical portion 311 so as to protrude radially outward. The connection portion 312 has a supply passage 303 as a “second communication passage” communicating with the through hole of the first valve body 31.

  The second valve body 32 is slidably accommodated on the inner wall 313 of the first valve body 31 via the seal member 326. The second valve body 32 is provided so as to partition the through hole of the first valve body 31 into a pressurizing chamber 301 as a “first communication chamber” on the telescopic pin 13 side and a valve chamber 302 on the drive unit 34 side. ing. The second valve body 32 is formed of a large inner diameter portion 321, a small inner diameter portion 322, and the like. The large inner diameter portion 321 and the small inner diameter portion 322 have a through hole 323 that penetrates in the direction of the central axis CA31 of the first valve body 31.

  The large inner diameter portion 321 is provided on the drive portion 34 side of the second valve body 32 and is formed in a substantially annular shape. The through hole 323 on the large inner diameter portion 321 side is formed so that the inner diameter is larger than the inner diameter of the through hole 323 on the small inner diameter portion 322 side. The inner wall 324 forming the through hole 323 on the large inner diameter portion 321 side is formed to be inclined with respect to the central axis CA31 of the first valve body 31.

  The small inner diameter portion 322 is provided on the pressurizing chamber 301 side of the second valve body 32 and is formed in a substantially annular shape. The small inner diameter portion 322 is provided so as to face the second small diameter portion 422 included in the pull-back rod 42 of the valve member 40.

The inner diameter of the pressurizing chamber 301 is larger than the inner diameter of the through hole 318 included in the intermediate member 316 as shown in FIG. Thereby, the end surface 317 of the intermediate member 316 on the pressurizing chamber 301 side is exposed on the telescopic pin 13 side of the pressurizing chamber 301.
Most of the valve member 40 is accommodated in the valve chamber 302 so as to be reciprocally movable.

  The valve member 40 reciprocates between the valve chamber 302 and the pressurizing chamber 301 by the driving force generated by the driving unit 34. The valve member 40 includes a pressurizing rod 41 and a pullback rod 42.

The pressure rod 41 is formed in a substantially rod shape. The pressure rod 41 is integrally formed with a shaft portion 411 and a contact portion 412.
The shaft portion 411 is formed so as to be guided by the inner wall 313 of the first valve body 31. An end portion of the shaft portion 411 on the pressure chamber 301 side is connected to the pull-back rod 42.
The contact part 412 is provided on the side of the pressure chamber 301 of the shaft part 411. The contact part 412 is formed so that the outer diameter is smaller than the outer diameter of the shaft part 411. A radially outer side wall 413 of the contact portion 412 is inclined with respect to the central axis CA31 of the first valve body 31. The side wall 413 is provided so as to be in contact with the inner wall 324 of the second valve body 32.
The end of the shaft portion 411 on the side where the contact portion 412 is provided and the contact portion 412 have an insertion hole 414 into which the pullback rod 42 is inserted.

  The pull-back rod 42 is formed in a substantially rod shape whose outer diameter is smaller than the outer diameter of the pressure rod 41. The pull-back rod 42 is integrally formed with a first small diameter part 421, a second small diameter part 422, and a large diameter part 423. The pull-back rod 42 is provided in the order of the first small diameter portion 421, the second small diameter portion 422, and the large diameter portion 423 from the drive unit 34 side.

  The first small diameter portion 421 is inserted into the insertion hole 414 of the pressure rod 41. Thereby, the pullback rod 42 is fixed to the pressure rod 41. The first small diameter portion 421 is formed so that the outer diameter is smaller than the inner diameter of the through hole 323 of the second valve body 32.

  The second small diameter portion 422 is inserted through the through hole 323 of the second valve body 32. The second small diameter portion 422 is formed so that the outer diameter is smaller than the outer diameter of the first small diameter portion 421. On the radially outer side of the second small diameter portion 422, a plurality of grooves 424 formed along the direction of the central axis CA31 are provided.

  The large diameter portion 423 is accommodated in the pressurizing chamber 301. The large diameter part 423 is formed so that the outer diameter is larger than the inner diameter of the through hole 323 on the small inner diameter part 322 side of the second valve body 32. The large diameter portion 423 can abut the end surface 425 on the side connected to the second small diameter portion 422 to the end surface 325 on the pressurizing chamber 301 side of the second valve body 32.

  The drive unit 34 is connected to the shaft portion 411 of the pressure rod 41. The drive unit 34 drives the pressure rod 41 to reciprocate in the direction of the central axis CA31.

  The release agent tank 35 stores a release agent supplied to the inside of the mold 10. The release agent tank 35 is connected to the connection portion 312 of the first valve body 31. The release agent stored in the release agent tank 35 passes through the supply passage 303 of the connecting portion 312, the valve chamber 302 of the cylindrical portion 311, the pressurizing chamber 301, the passage 130 of the telescopic pin 13, and the discharge hole 131. It is discharged into the mold 10.

  Next, the casting method by 1st Embodiment using the casting apparatus 1 is demonstrated. FIG. 4 shows a flowchart of the casting process. In FIG. 5, the time change of the supply pressure of the molten metal in the casting method by 1st Embodiment and the discharge pressure to the inside of the metal mold | die 10 of a mold release agent is shown. In FIG. 5, the supply pressure of the molten metal is indicated by a dotted line L1, and the discharge pressure of the release agent is indicated by a solid line L2. FIGS. 6 to 10 are schematic views for explaining different processes in the casting method according to the first embodiment. 6 to 10, the left side of FIGS. 6 to 10 is the “drive unit direction”, the right side of FIGS. 6 to 10 is the “nesting pin direction”, and the movement direction of the valve member 40 and the second valve body 32 is the same. explain.

  First, in step (hereinafter abbreviated as “S”) 101, a mold release agent is applied to the inner wall of the mold 10 where the molten metal may come into contact. In the casting apparatus according to the first embodiment, before the first mold part 11 and the second mold part 12 are combined, the inner wall 110 that forms the internal space 100 and the inner wall that forms the communication path 101 in the first mold part 11. 113, a mold release agent is applied to the inner wall 120 forming the inner space 100 in the second mold part 12, the inner wall 122 forming the communication path 101, and the outer wall 132 of the portion protruding from the inner space 100 of the insert pin 13. Apply (see FIG. 1). The inner walls 110, 113, 120, 122 and the outer wall 132 correspond to a “metal member forming surface” recited in the claims.

  Next, in S <b> 102 as the “hot water supply process”, the molten metal is supplied to the molten metal supply unit 20. After combining the first mold part 11 and the second mold part 12, the molten metal is poured into the sleeve 21 in which the plunger 22 is located on the opening 211 side with respect to the supply port 212 via the supply port 212. Hot water.

In parallel with S102, the release agent supply unit 30 supplies the release agent to the insert pin 13 in S103.
FIG. 6 shows the positional relationship between the valve member 40 and the first valve body 31 and the second valve body 32 when the release agent is supplied to the insert pin 13 in S102. When the release agent is supplied to the telescopic pin 13, as shown in FIG. 6, the inner wall 324 of the second valve body 32 and the side wall 413 of the pressure rod 41 are separated from each other, and the second valve body. The end face 325 of 32 and the end face 425 of the pull-back rod 42 are separated from each other. Thereby, the release agent passing through the supply passage 303 is located between the valve chamber 302, the inner wall 324 of the second valve body 32, and the side wall 413 of the pressurizing rod 41, as indicated by a two-dot chain line arrow F1 shown in FIG. It is supplied to the passage 130 of the telescopic pin 13 through the gap, the groove 424 of the pullback rod 42, the gap between the end surface 325 of the second valve body 32 and the end surface 425 of the pullback rod 42, and the pressurizing chamber 301.

Next, in S104, the valve member 40 is moved toward the telescoping pin, and in S105, the valve member 40 and the second valve body 32 are brought into contact with each other.
FIG. 7 shows the positional relationship between the valve member 40, the first valve body 31, and the second valve body 32 when the valve member 40 and the second valve body 32 are brought into contact with each other. When the valve member 40 is moved in the telescoping pin direction, the side wall 413 of the pressure rod 41 and the inner wall 324 of the second valve body 32 come into contact with each other as shown in FIG. Thereby, the valve chamber 302 and the pressurizing chamber 301 are shut off.
When the valve member 40 further moves in the direction of the telescopic pin, the second valve body 32 moves in the direction of the telescopic pin together with the valve member 40. As a result, the volume of the pressurizing chamber 301 is reduced, and pressurization of the release agent supplied to the pressurizing chamber 301 and the passage 130 of the telescopic pin 13 is started (time t1 in FIG. 5).

  The pressurized release agent is discharged into the mold 10 from the discharge hole 131 of the insert pin 13 (S106 in FIG. 4). Thus, the release agent is further applied to the outer wall 132 of the insert pin 13 (between time t1 and time t3 in FIG. 5). At this time, the release agent is prevented from being excessively discharged from the discharge hole 131. As shown in FIG. 5, the valve member 40 is moved so as to keep the pressure of the release agent constant (between time t2 and time t3 in FIG. 5).

  Next, in S <b> 107 as the “metal melt filling step”, the metal melt is filled into the mold 10 while discharging the release agent from the discharge holes 131. In the molten metal supply unit 20, the molten metal in the sleeve 21 is pressurized and supplied to the internal space 100 and the communication path 101 by moving the plunger 22. At this time, in the release agent supply unit 30, the second valve body 32 is further moved in the direction of the telescoping pin via the valve member 40, and the pressure of the release agent discharged from the discharge hole 131 is increased inside the mold 10. The pressure is increased so as to be higher than the pressure of the molten metal supplied to (between time t3 and time t4 in FIG. 5). In the casting apparatus 1 according to the first embodiment, the second valve body 32 is movable until it comes into contact with the end surface 317 of the intermediate member 316 as shown in FIG. In the release agent supply unit 30, the release agent continues to be pressurized as the second valve body 32 continues to move in the direction of the telescoping pin.

  After the pressure of the molten metal filled in the mold 10 reaches a predetermined casting pressure P1 (pressure at time t4 in FIG. 5), the molten metal is solidified in S108 as a “solidification step”. After the supply of the molten metal by the molten metal supply unit 20 is stopped, the molten metal filled in the mold 10 is solidified using, for example, cooling water. While the molten metal is solidified, the release agent supply unit 30 continues to discharge the release agent from the discharge hole 131 at a pressure P2 higher than the casting pressure P1 (between time t4 and time t5 in FIG. 5).

  After solidification of the molten metal proceeds to a certain extent, the discharge of the release agent from the discharge hole 131 is stopped in S109. Specifically, when the movement of the pressure rod 41 in the direction of the telescoping pin is stopped and the movement of the pressure rod 41 in the direction of the drive unit is started, as shown in FIG. The inner wall 324 of the second valve body 32 is separated. When the side wall 413 and the inner wall 324 are separated from each other, the release agent in the supply passage 303 is changed between the valve chamber 302, the inner wall 324 of the second valve body 32, and the pressure rod 41 as indicated by a two-dot chain arrow F2 shown in FIG. The gap 130 between the side wall 413, the groove 424 of the pullback rod 42, the gap between the end surface 325 of the second valve body 32 and the end surface 425 of the pullback rod 42, the passage 130 of the telescopic pin 13 through the pressure chamber 301. Will be supplied again.

  Further, when the pressure rod 41 is moved in the direction of the drive unit, the end surface 325 of the second valve body 32 and the end surface 425 of the pull-back rod 42 come into contact with each other as shown in FIG. When the pressure rod 41 further moves in the direction of the drive unit from this state, the second valve body 32 moves integrally with the valve member 40 in the direction of the drive unit. Thereby, the 2nd valve body 32 returns to the position of the state shown in FIG.

  Next, in S110, the mold 10 is opened, and the formed metal member is removed from the casting apparatus 1. The combination of the first mold part 11 and the second mold part 12 is released, and the molded metal member is taken out from the mold 10.

  (A) The casting apparatus 1 according to the first embodiment has a discharge hole 131 capable of discharging a release agent inside the mold 10. In the “metal melt filling process” in which the molten metal is supplied into the mold 10, the casting apparatus 1 continues to supply the mold release agent between the outer wall 132 and the molten metal. Thereby, the film | membrane of a mold release agent is formed between the outer wall 132 and a molten metal, and it can interrupt | block the outer wall 132 and a molten metal reliably. Therefore, it is possible to prevent problems such as generation and deformation of an intermetallic compound between the metal member and the mold 10.

(B) Conventionally, the release agent is applied to the metal member molding surface before filling the molten metal into the mold. However, if the molten metal is supplied into the mold coated with the release agent, the release agent film formed on the molding surface of the metal member may be washed away. For this reason, for example, when the material of the molten metal is an aluminum alloy, an intermetallic compound is generated due to the affinity with the material forming the mold, for example, iron, and the metal member molding surface is damaged. Shorter.
In the casting method according to the first embodiment, the mold release agent is supplied to the outer wall 132 of the insert pin 13 while the molten metal is being supplied into the mold 10. Thereby, a film of a release agent is formed between the outer wall 132 and the molten metal, and for example, damage such as generation of an intermetallic compound by reaction with the molten metal can be prevented. Therefore, since the life of the mold can be extended, the manufacturing cost of the metal member can be reduced.

  (C) Moreover, since it becomes difficult to damage a metal member molding surface, the time required for the repair process when the metal member molding surface is damaged can be shortened. Thereby, the manufacturing cost of a metal member can further be reduced.

  (D) In addition, conventionally, in order to extend the life of the mold, the metal member forming surface is specially treated. However, by performing a surface treatment different from usual, the cost of the mold increases and the manufacturing cost increases. In the casting method according to the first embodiment, such a surface treatment is not necessary, so that the manufacturing cost of the mold can be reduced. Thereby, the manufacturing cost of a metal member can further be reduced.

  (E) In the casting apparatus 1 according to the first embodiment, after stopping the discharge of the release agent from the discharge hole 131 of the insert pin 13, when the pressure rod 41 is moved in the direction of the drive unit, The side wall 413 and the inner wall 324 of the second valve body 32 are separated from each other. When the side wall 413 and the inner wall 324 are separated from each other, the volume of the passage 130 of the pressurizing chamber 301 and the insertion pin 13 does not change, and the release agent of the supply passage 303 is changed as indicated by a two-dot chain line arrow F2 shown in FIG. Then, it is supplied again to the passage 130 of the telescopic pin 13 and the pressurizing chamber 301. As a result, the molten metal filled in the mold 10 can be prevented from flowing into the passage 130 via the discharge hole 131. Therefore, insufficient supply of the release agent in the next casting process can be prevented, and defects of the metal member can be prevented.

(Second Embodiment)
Next, the casting apparatus by 2nd Embodiment of this invention is demonstrated based on FIGS. The second embodiment differs from the first embodiment in that the mold has a discharge hole opening / closing part. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 1st Embodiment, and description is abbreviate | omitted.

  In the casting apparatus 2 according to the second embodiment, the mold 10 includes a first mold part 11, a second mold part 12, a telescopic pin 14 as a “projection part”, and a discharge hole as a “supply hole opening / closing part”. It is composed of an opening / closing part 15 and the like.

  As shown in FIG. 11, the insertion pin 14 is a metal member formed in a cylindrical shape. The insertion pin 14 is inserted through the insertion hole 111 of the first mold part 11. The insert pin 14 has a through hole 140 that penetrates the insert pin 14 in the direction in which the insert pin 14 is inserted. The through hole 140 can communicate with the inside of the release agent supply unit 30. A discharge hole serving as a “supply hole” capable of communicating the through hole 140 and the internal space 100 is provided at an end on the side protruding into the internal space 100. In the second embodiment, as shown in FIG. 11, three discharge holes are formed so as to be arranged in the direction of the central axis CA <b> 14 of the insert pin 14. Here, for convenience, the discharge holes 141, 142, and 143 are sequentially formed from the end of the telescopic pin 14 that protrudes into the internal space 100.

  The discharge hole opening / closing part 15 is provided so as to cover the end part of the insertion pin 14 on the side protruding into the internal space 100. The discharge hole opening / closing part 15 includes a regulating member 151 as a “regulating part”, a first annular member 16, a second annular member 17, a third annular member 18, a spring 152 as a “biasing member”, a positioning member 153, and the like. Have. The 1st annular member 16, the 2nd annular member 17, and the 3rd annular member 18 are equivalent to the "annular member" as described in a claim.

  The restricting member 151 is provided so as to close the opening on the inner space 100 side of the through hole 140 of the telescopic pin 14. The outer diameter of the restricting member 151 is larger than the outer diameter of the end portion of the telescopic pin 14 on the side protruding into the internal space 100. The restriction member 151 restricts the movement in the direction of the internal space 100 so that the first annular member 16, the second annular member 17, and the third annular member 18 do not drop into the internal space 100.

  The first annular member 16, the second annular member 17 and the third annular member 18 are substantially annular members provided on the radially outer side of the telescopic pin 14. The first annular member 16, the second annular member 17, and the third annular member 18 are provided so as to reciprocate in the direction of the central axis CA 14 along the outer wall 144 of the telescopic pin 14. The first annular member 16, the second annular member 17, and the third annular member 18 are arranged in this order from the regulating member 151 side.

  As shown in FIG. 12, the first annular member 16 and the second annular member 17 are formed so that the cross-sectional shape including the central axis CA14 is a hexagon. The inner walls 161 and 171 on the radially inner side of the first annular member 16 and the second annular member 17 are formed to be slidable on the outer wall 144 of the telescopic pin 14. Of the side walls 162 and 163 that are substantially perpendicular to the central axis CA 14 of the first annular member 16, the side wall 162 is formed so as to be able to contact the outer wall 154 of the regulating member 151 on the first annular member 16 side. The side wall 163 is formed so as to be able to contact the side wall 172 substantially perpendicular to the central axis CA14 of the second annular member 17. Further, the side wall 173 substantially perpendicular to the central axis CA14 of the second annular member 17 is formed so as to be able to contact the side wall 183 substantially perpendicular to the central axis CA14 of the third annular member 18.

In the first annular member 16, the connection wall 164 that connects the inner wall 161 and the side wall 162 is formed so as to be inclined in a direction away from the central axis CA 41 toward the regulating member 151 with respect to the central axis CA 14. Further, the connection wall 165 that connects the inner wall 161 and the side wall 163 is formed so as to be inclined toward the central axis CA41 toward the regulating member 151 with respect to the central axis CA14.
In the second annular member 17, the connecting wall 174 that connects the inner wall 171 and the side wall 172 is formed so as to be inclined in a direction away from the central axis CA 41 toward the regulating member 151 with respect to the central axis CA 14. Further, the connection wall 175 that connects the inner wall 171 and the side wall 173 is formed so as to incline toward the central axis CA41 toward the regulating member 151 with respect to the central axis CA14.

The third annular member 18 has an annular part 181 and a guide part 182.
The annular portion 181 is provided on the regulating member 151 side of the third annular member 18, and is formed so that the cross-sectional shape including the central axis CA14 is a hexagon. An inner wall 184 on the radially inner side of the annular portion 181 is slidably formed on the outer wall 144 of the telescopic pin 14. The connecting wall 185 that connects the inner wall 184 and the side wall 183 is formed so as to be inclined in a direction away from the central axis CA41 toward the regulating member 151 with respect to the central axis CA14.

  The guide part 182 is provided so as to extend from the annular part 181 to the side opposite to the internal space 100. The cylindrical guide portion 182 is formed so that the outer diameter is smaller than the outer diameter of the annular portion 181. An inner wall 186 on the radially inner side of the guide portion 182 is formed to be slidable on the outer wall 144 of the telescopic pin 14. The guide part 182 guides the reciprocating movement of the third annular member 18 in the direction of the central axis CA41.

  When the side wall 162 of the first annular member 16 and the outer wall 154 of the regulating member 151 are in contact with each other, the first annular member 16 and the regulating member 151 block the discharge hole 141. When the side wall 163 of the first annular member 16 and the side wall 172 of the second annular member 17 are in contact with each other, the first annular member 16 and the second annular member 17 close the discharge hole 142. When the side wall 173 of the second annular member 17 and the side wall 183 of the third annular member 18 are in contact with each other, the second annular member 17 and the third annular member 18 close the discharge hole 143. At this time, the side wall 187 of the guide portion 182 opposite to the annular portion 181 is separated from the positioning member 153.

  The spring 152 is provided between the annular portion 181 and the positioning member 153. The spring 152 biases the third annular member 18 in the direction of the restricting member 151.

  The positioning member 153 is a cylindrical member provided between the telescopic pin 14 and the first mold part 11. The side wall 155 of the positioning member 153 on the inner space 100 side is formed such that one end of the spring 152 is in contact with the side wall 187 of the third annular member 18.

  Next, the casting method in 2nd Embodiment using the casting apparatus 2 is demonstrated. FIG. 13 shows a flowchart of the casting process. 12 and 14, the left side of FIGS. 12 and 14 is the “release agent supply unit direction”, and the right side of FIG. 12 and 14 is the “regulating member direction”, and the first annular member 16 and the second annular member 17. The moving direction of the third annular member 18 will be described.

First, in S201, a mold release agent is applied to the inner wall of the mold 10 where the molten metal may come into contact as in S101 of the first embodiment.
Next, in S202, the molten metal is supplied to the molten metal supply unit 20 as in S102 of the first embodiment. Moreover, in S203, a mold release agent is supplied to the insertion pin 13 similarly to S103 of 1st Embodiment.

Next, in S <b> 204, the metal melt is filled into the mold 10 while discharging the release agent from the discharge holes 131 as in S <b> 107 of the first embodiment.
Next, in S205, a part of the molten metal filled in the mold 10 is solidified. At this time, the molten metal inside the mold 10 solidifies from the region MS2 in contact with the inner walls 110, 113, 120, 122 of the mold 10 and the outer wall 144 of the telescopic pin 14 (see FIG. 14).

  Next, in S206, the valve member 40 is moved in the direction of the restricting member as in S104 of the first embodiment, and in S207, the valve member 40 and the second valve body 32 are brought into contact with each other as in S105 of the first embodiment. . Furthermore, when the valve member 40 moves in the direction of the regulating member, the volume of the pressurizing chamber 301 decreases, and pressurization of the release agent supplied to the pressurizing chamber 301 and the passage 130 of the telescopic pin 13 is started.

Next, in S208, the release agent is discharged from the discharge holes 141, 142, and 143. The operation of the discharge hole opening / closing part 15 at this time will be described with reference to FIGS.
Before the volume of the pressurizing chamber 301 decreases in S207, the through hole 140 of the telescopic pin 14 is filled with a release agent (state shown in FIG. 12). The pressure of the release agent filled in the through hole 140 acts on the connection walls 164 and 165 of the first annular member 16, the connection walls 174 and 175 of the second annular member 17, and the connection wall 185 of the third annular member 18. Then, it is converted into an acting force in the direction of the central axis CA14. When the pressure of the release agent in the through-hole 140 becomes “predetermined pressure” or more and the acting force in the direction of the central axis CA14 becomes larger than the urging force of the spring 152, the first annular member closing the discharge holes 141, 142, 143 16, the 2nd annular member 17 and the 3rd annular member 18 move to a mold release agent supply part direction. As a result, as shown in FIG. 14, the discharge holes 141, 142, and 143 are opened, and the release agent is discharged between the molten metal region MS2 and the outer wall 144 of the insert pin 14 (see FIG. 14). Solid line arrow F3 in FIG. At this time, the side wall 187 of the third annular member 18 comes into contact with the side wall 155 of the positioning member 153, and the discharge holes 141, 142, 143 are prevented from being excessively opened.

Returning to the flowchart of FIG. 13, next, in step S <b> 209, all of the molten metal filled in the mold 10 is solidified.
Next, in S210, the discharge of the release agent from the discharge holes 141, 142, 143 is stopped. Specifically, when the valve member 40 is operated in the driving direction and the contact with the second valve body 32 is released, the pressure of the release agent filled in the pressurizing chamber 301 and the through hole 140 is reduced. The first annular member 16, the second annular member 17, and the third annular member 18 move in the direction of the regulating member by the biasing force of the spring 152. Thereby, the regulating member 151 and the first annular member 16, the first annular member 16 and the second annular member 17, the second annular member 17 and the third annular member 18 come into contact with each other, and the discharge holes 141, 142, and 143 are formed. Blocking occurs and the discharge of the release agent stops.

  Next, in S211, the mold 10 is opened as in S110 of the first embodiment, and the molded metal member is removed from the casting apparatus 1.

  The casting apparatus 2 according to the second embodiment has a discharge hole 141 capable of discharging a release agent inside the mold 10. Thereby, in the casting apparatus 2, the film | membrane of a mold release agent is formed between the outer wall 144 and a molten metal, and can interrupt | block the outer wall 144 and a molten metal reliably. Therefore, the second embodiment has the effects (a) to (d) of the first embodiment.

  Further, the mold 10 of the casting apparatus 2 according to the second embodiment has a discharge hole opening / closing part 15 that can open and close the discharge holes 141, 142, and 143. The discharge hole opening / closing part 15 closes the discharge holes 141, 142, 143 when the release agent is not supplied into the mold 10, and the molten metal filled in the mold 10 is discharged from the discharge holes 141, 142, It is possible to reliably prevent the liquid from flowing into 143 and being blocked. Therefore, as compared with the first embodiment, the casting apparatus 2 can reliably prevent insufficient supply of the release agent in the next casting process, and can reliably prevent defects in the metal member.

  The discharge hole opening / closing unit 15 opens and closes the discharge holes 141, 142, and 143 according to the pressure of the release agent supplied by the release agent supply unit 30. Thereby, it is possible to prevent the molten metal from flowing into the through hole 140 with a simple configuration.

(Other embodiments)
(A) In the above-described embodiment, the metal member is formed by die casting. However, the casting method of the present invention is not limited to this. Any casting method may be used as long as a metal having a temperature higher than the melting point is poured into the mold to obtain a metal member having a desired shape.

  (A) In the first embodiment, the outer wall of the nesting pin is a “metal member molding surface”, and the outer wall of the nesting pin has a discharge hole for discharging the release agent. However, the “metal member forming surface” is not limited to this. A discharge hole may be provided as the “metal member forming surface” as long as the molten metal filled in the mold may come into contact therewith.

  (C) In the above-described embodiment, the release agent is discharged into the mold in the “hot water supply step” and the “solidification step”. However, it is not necessary to discharge the release agent in the “hot water supply process” and the “coagulation process”.

  (D) In the above-described embodiment, the mold release agent is discharged into the mold at a pressure higher than the casting pressure. The pressure at which the mold release agent is discharged is not limited to this, but it is desirable that the pressure at which the mold release agent is discharged from the discharge hole is higher than the casting pressure in order to prevent the molten metal from flowing back into the discharge hole and passage of the insert pin. .

  (E) In the above-described embodiment, the release agent supply unit includes a valve member, a first valve body that slidably accommodates the valve member, and a slidably accommodated inside the first valve body. It is assumed that it is composed of a second valve body that pressurizes the release agent by contact. However, the configuration of the release agent supply unit is not limited to this.

  (F) In the second embodiment, the discharge hole opening / closing portion includes a regulating member, a first annular member, a second annular member, a third annular member, a spring, a positioning member, and the like. However, the configuration of the discharge hole opening / closing part is not limited to this.

  (G) In the second embodiment, three discharge holes are formed so as to be arranged in the direction of the central axis of the insert pin. In accordance with this, three “annular members” for opening and closing the discharge holes are provided. However, the number of discharge holes and the number of annular members are not limited to this. Only one discharge hole may be provided, or two or four or more may be provided. When only one discharge hole is provided, one annular member may be provided. Further, for example, when four discharge holes are provided, four annular members may be provided.

  (H) In the second embodiment, the mold release agent is supplied into the mold after filling the mold with the molten metal. However, as in the first embodiment, the molten metal may be filled while supplying the release agent into the mold.

  As mentioned above, this invention is not limited to such embodiment, It can implement with a various form in the range which does not deviate from the summary.

1, 2 ... Casting equipment,
10 ... mold,
100 ・ ・ ・ Internal space (inside the mold),
101 ・ ・ ・ Communication passage (inside the mold),
110 ・ ・ ・ Inner wall (metal member molding surface),
113 ... Inner wall (metal member molding surface),
120 ... inner wall (metal member molding surface),
122 ... inner wall (metal member molding surface),
131, 141 ... discharge holes (supply holes),
132, 142 ... outer wall (metal member molding surface),
20 ... Molten metal supply section,
30 ... release agent supply section,
301: Pressurizing chamber (first communication chamber).

Claims (10)

A casting method for solidifying a molten metal filled in a mold (10) (100, 101) to form a metal member having a desired shape,
Molten metal that fills the inside of the mold with the metal melt while supplying a mold release agent between the metal member molding surface (110, 113, 120, 122, 132) that forms the inside of the mold and the molten metal. A casting method comprising a filling step.   In the molten metal filling step, the mold release agent is supplied into the mold at a pressure (P2) higher than a casting pressure (P1) at which the molten metal is filled in the mold. The casting method according to claim 1.   The method according to claim 1, further comprising a solidification step of solidifying the molten metal filled in the mold while supplying a release agent into the mold after the molten metal filling step. The casting method described.   4. The hot water supplying step of supplying hot water to the molten metal supply unit (20) while supplying a mold release agent to the inside of the mold before the molten metal filling step. The casting method according to any one of the above. A casting apparatus (1, 2) for solidifying a molten metal and forming a metal member of a desired shape,
A mold (10) having a supply hole (131, 141, 142, 143) for supplying a release agent on a metal member molding surface (110, 113, 120, 122, 132) in contact with the molten metal;
A molten metal supply section (20) for supplying a molten metal into the mold,
A release agent supply section (30) having a first communication chamber (301) communicating with the supply hole, and supplying a release agent to the supply hole via the first communication chamber;
A casting apparatus comprising: The release agent supply unit is
The first communication chamber whose volume can be changed, the second communication chamber (303) through which a release agent supplied from the outside passes, and a valve provided so as to allow communication between the first communication chamber and the second communication chamber A first valve body (31) having a chamber (302);
A cylindrical second valve body (32) slidably provided on the inner wall (313) of the first valve body;
The second valve body is slidably provided on the inner wall of the first valve body on the side opposite to the first communication chamber, and has an outer diameter larger than the inner diameter of the through hole (323) of the second valve body. A length of the first valve body in the direction of the central axis (CA31) provided at an end of the shaft part (411) and the shaft part on the first communication chamber side is a length of the second valve body in the direction of the central axis. A small-diameter portion (421, 422) that is formed to be longer than the through-hole and inserted into the through-hole, and an end portion on the first communication chamber side of the small-diameter portion that is provided to be accommodated in the first communication chamber. A valve member (40) having a large diameter portion (423) having an outer diameter larger than the inner diameter of the through hole, and reciprocatingly moving inside the first valve body;
A drive unit (34) capable of reciprocating the valve member with respect to the first valve body;
A release agent reservoir (35) for storing a release agent supplied to the second communication chamber;
Have
When the shaft portion, the large diameter portion and the second valve body are separated from each other, the first communication chamber and the second communication chamber communicate with each other through the through hole. When the one and the second valve body come into contact with each other, the first communication chamber and the second communication chamber are cut off, and the shaft portion in contact with the second valve body is in the direction of the first communication chamber. The second valve body moves so as to reduce the volume of the first communication chamber, and the large diameter portion in contact with the second valve body moves in a direction opposite to the first communication chamber. Then, the second valve body moves so as to increase the volume of the first communication chamber.   The mold release agent supply unit supplies the mold release agent into the mold at a pressure higher than a casting pressure at which the molten metal is filled into the mold. The casting apparatus described in 1.   The casting apparatus according to any one of claims 5 to 7, wherein the mold has a supply hole opening / closing part (15) capable of closing or opening the supply hole. The mold has a cylindrical protrusion (14) protruding into the mold,
The protrusion has the supply hole that communicates the inside and the outside of the protrusion in the radial direction of the protrusion,
The supply hole opening and closing part is
A plurality of annular members (16, 17, 18) provided on the radially outer side of the protrusion along the outer wall (144) of the protrusion, and provided at one end of the protrusion. A restricting portion (151) for restricting movement of the annular member in the direction of one end of the protruding portion, and a plurality of the annular members and the restricting portion provided on the radially outer side of the protruding portion so as to contact each other. A biasing member (152) for biasing the annular member toward one end of the protruding portion;
Have
The plurality of annular members are in contact with each other and the supply holes are closed when the annular members are in contact with the restricting portion, and the supply holes are opened when the plurality of annular members are separated from each other. The casting apparatus according to 8. Connection walls (164, 165, 174, 175, 185) connecting the inner walls (161, 171, 184) on the radially inner side of the annular member and the side walls (162, 163, 172, 173, 183) of the annular member Is formed to be inclined with respect to the central axis (CA14) direction of the protrusion,
10. The casting apparatus according to claim 9, wherein the supply hole opening / closing portion separates the plurality of annular members from each other when a pressure of the release agent acting on the connection wall becomes equal to or higher than a predetermined pressure.

Images