JP2012166221A - Casting die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily exhaust the gas from a cavity of a casting die, and to easily discharge a powdery burr.SOLUTION: A vent 54 for the exhausting gas from the cavity 16 is formed through a second half-die 38 constituting a movable die 34 of the casting die. The vent 54 continues to a cavity defining recess 44, and includes first grooves 56a-56d so extended as inclined by a predetermined angle from a vertical direction, and second grooves 58a and 58b that continue to the first grooves 56a-56d and open at both the lower end surface and the upper end surface of the movable die 34. The second grooves 58a and 58b are preferred to be supplied with a gas for blowing, such as compressed air.

Description

  The present invention relates to a casting mold for filling a cavity with a molten metal to obtain a cast product.

  The casting is produced by cooling and solidifying the molten metal filled in the cavity of the casting mold. Here, the atmosphere remains in the cavity before the molten metal is filled. Under the situation where the atmosphere is not exhausted, it is difficult to fill the molten metal. Moreover, when much air | atmosphere remains, a molten metal will entrain air | atmosphere and a cavity will be formed resulting from this.

  In order to avoid such inconvenience, a vent communicating with the cavity is formed in the casting mold. When the molten metal is introduced into the cavity, the air present in the cavity is exhausted to the outside of the casting mold through the vent.

  Exhaust becomes easier as the sectional area of the vent is increased. When the dust burrs block the vent, it becomes difficult to discharge the atmosphere in the cavity. For this reason, the cross-sectional area of the vent is set in consideration of whether to facilitate exhausting or to prevent generation of dust burrs as shown in Patent Document 1. It is common.

  Therefore, it is considered that it is effective to increase the cross-sectional area of the vent to facilitate exhaust and to remove the generated powder burrs from the vent. For example, Patent Document 2 proposes that compressed air is supplied in the vicinity of the opening of the vent, thereby sucking powder burrs in the vent under a negative pressure.

Japanese Patent Laid-Open No. 7-116807 JP-A-10-328805

  As shown in FIG. 1 of Patent Document 1 and FIG. 1 of Patent Document 2, this type of vent is generally directed from the cavity to above the casting mold, in other words, vertically upward. It is formed to extend in the direction. That is, the vent opening is provided on the upper end surface of the casting mold. When a sliding mold is disposed on the upper end surface, there is a concern that powder burrs may be caught between the casting mold and the sliding mold. When such a situation occurs, the sliding mold is damaged.

  In addition, if the amount of powder burrs discharged from the vent is large, the sliding type may cause malfunction.

  The present invention has been made to solve the above-mentioned problems, and provides a casting mold in which a vent is formed in which gas can be easily exhausted from a cavity and powder burr can be easily exhausted. The purpose is to do.

In order to achieve the above object, the present invention provides a casting mold in which a vent for exhausting gas from the cavity is formed when the cavity is filled with molten metal,
The vent communicates with the cavity and has a first groove having a portion extending in a direction other than the vertical direction;
A second groove that communicates with the first groove and opens at both a lower end surface and an upper end surface of the casting mold;
It is characterized by comprising.

  In the prior art, the vent was formed so as to extend vertically upward from the cavity, and the powder burr was sent vertically upward to be discharged from the opening above the vent. In the present invention to be used, even if powder burrs are generated, the powder burrs are fed in a direction other than the vertical direction through the first groove, and further, a casting mold is formed through the second groove connected to the first groove. It is made to discharge from the opening formed below. Therefore, it is prevented that the powder burr rises.

  Moreover, the distance from the outlet of the first groove (communication port with the second groove) to the upper end surface of the casting mold is longer than that of the vent extending vertically upward from the cavity. This also makes it difficult for the powder burrs to rise.

  For the above reasons, it is possible to prevent powder burrs from reaching the upper end surface of the casting mold. For this reason, for example, it is prevented that the powder burr is bitten into the mating surface of the casting mold and the sliding mold. As a result, it is possible to prevent the sliding mold from being damaged and the sliding mold from malfunctioning.

  In addition, since it is difficult for the powder burrs to rise, it is easy to drop the powder burrs and thus to discharge from the opening on the lower side of the casting mold.

  Thus, in the present invention, it is easy to discharge the powder burrs. Therefore, the cross-sectional area of the first groove can be increased so that the air can easily pass therethrough. In general, dust burrs are likely to occur in such a first groove. However, in the present invention, even if dust burrs are generated as described above, it is easy to discharge them. This is because there is no problem even if burrs occur.

  And it becomes easy to exhaust air | atmosphere from a cavity by setting a 1st groove | channel to a predetermined | prescribed cross-sectional area in this way.

  In the above configuration, it is preferable to provide a gas supply means for supplying a blowing gas to the second groove. In this case, since the vicinity of the communication port between the first groove and the second groove becomes negative pressure, dust burrs and air are sucked to the second groove side. Moreover, the powder burrs and the air that have reached the second groove are transported to the opening of the casting mold along with the gas flowing through the second groove. For this reason, discharge of powder burrs and exhaust of air becomes easier.

  A plurality of first grooves may be formed. In this case, if a plurality of first grooves communicate with one second groove, it is not necessary to form more second grooves than necessary. Therefore, the degree of freedom of the layout layout of the second grooves is improved.

  In addition, it is preferable that the extending direction of the second groove is a vertical direction. In this case, when powder burrs, air, or a blowing gas is supplied, the gas easily flows through the second groove. Therefore, the discharge of powder burrs and the exhaust of air become easier.

  In the present invention, the first groove having a portion that communicates with the cavity and extends in a direction other than the vertical direction, the first groove communicates with the first groove, and the lower end surface and the upper end surface of the casting mold. Since a vent having a second groove opened on both sides is formed, even if powder burrs are generated, it becomes difficult for the powder burrs to reach the upper end surface of the casting mold, It becomes easy to discharge the powder burrs. Therefore, even if the cross-sectional area of the first groove is increased to facilitate the exhaust of the atmosphere from the cavity, the powder burrs can be easily discharged.

  That is, according to the present invention, it becomes easy to discharge the powder burrs and exhaust the air from the cavity.

It is a principal part schematic perspective view of the casting apparatus comprised including the metal mold | die for casting (movable type | mold) which concerns on embodiment of this invention. It is a principal part schematic front view of the metal mold | die for casting (movable type | mold) which concerns on embodiment of this invention.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a casting mold according to the present invention will be described in detail with reference to the accompanying drawings by giving preferred embodiments in relation to a casting apparatus including the casting mold.

  FIG. 1 is a schematic perspective view of a main part of the casting apparatus 10. The casting apparatus 10 includes a fixed plate 12 that is positioned and fixed, a movable plate 14 that is displaced so as to approach or separate from the fixed plate 12, and a first cavity 16 that forms a cavity 16 together with the fixed plate 12 and the movable plate 14. A first sliding mold 18, a second sliding mold 20, and a third sliding mold 22. In FIG. 1, the cavity 16 is shown as an open space for easy understanding, but the actual cavity 16 is of course a closed space.

  The fixed platen 12 includes a fixed-side main body 24 and a fixed mold 26 that is detachably supported by the fixed-side main body 24. Among these, a pouring port 28 is formed in the stationary-side main body 24, while a runner 30 is formed in the stationary mold 26. As will be described later, the molten metal passes through the pouring port 28 and the runner 30 and is introduced into the cavity 16. The fixed mold 26 is housed in a housing recess (not shown) formed on the end surface of the stationary main body 24 facing the movable platen 14 side.

  The movable platen 14 includes a movable side main body 32 and a movable mold 34 that is detachably supported by the movable side main body 32. The movable mold 34 is constituted by a first split mold 36 and a second split mold 38 as a casting mold according to the present embodiment being integrally supported by a support board 40. A bottomed receiving recess 42 is formed in the end face of the movable side body 32 facing the fixed platen 12, and the support plate 40 is received in the receiving recess 42.

  Here, the principal part enlarged front view of the 2nd division | segmentation type | mold 38 is shown in FIG. The second split mold 38 includes a cavity defining portion 46 in which a cavity defining recess 44 for forming the cavity 16 is depressed, and the left and right end portions of the cavity defining portion 46 in FIG. The first protrusion 48 and the second protrusion 50 are formed and protrude so as to extend toward the fixed mold 26.

  Among these, the cavity defining recess 44 is recessed in the direction toward the movable main body 32 from the end surface of the cavity defining portion 46 facing the fixed mold 26. The same applies to the sinking directions of the overflow portions 52a to 52d and the vent 54 described below.

  Overflow shoulders 52 a to 52 d communicating with the cavity defining recess 44 are recessed and formed at the upper left shoulder, substantially upper center, right side, and lower right of the cavity defining recess 44. These overflow portions 52 a to 52 d form a chamber for storing the molten metal leaked from the cavity 16.

  The first grooves 56a to 56d constituting the vent 54 communicate with each of the overflow portions 52a to 52d. The first grooves 56a to 56d are formed to be recessed so that each depth is smaller than that of the overflow portions 52a to 52d. That is, the distance from the surface of the second split mold 38 to the bottom surfaces of the first grooves 56a to 56d is smaller than the distance from the surface of the second split mold 38 to the bottom surfaces of the overflow portions 52a to 52d. Is set.

  As can be understood from FIG. 2, the first grooves 56 a to 56 d are bent into a substantially “<” shape. For this reason, the downstream end portions (end portions on the side away from the cavity 16) of the first grooves 56a to 56d extend so as to be inclined at a predetermined angle with respect to the vertical direction. Specifically, the first grooves 56a, 56b, and 56d are inclined by approximately 90 ° with respect to the vertical direction, and the first groove 56c is inclined by approximately 45 ° with respect to the vertical direction. The angles θ1 to θ4 in the first grooves 56a to 56d are all about 135 °.

  The vent 54 includes, in addition to the first grooves 56a to 56d, second grooves 58a and 58b formed at the first projecting portion 48 and the starting end portion of the second projecting portion 50. That is, the second grooves 58 a and 58 b are located at the boundary between the cavity defining portion 46, the first projecting portion 48, and the second projecting portion 50.

  The second grooves 58 a and 58 b extend along the vertical direction and open at the lower end surface and the upper end surface of the second split mold 38. In the following description, the opening on the lower end surface side is referred to as a lower opening, the opening on the upper end surface side is referred to as an upper opening, reference numerals for the lower opening are 60a and 60b, and reference numerals for the upper opening are 62a and 62b.

  The first grooves 56a and 56b are connected to the second groove 58a, and the first grooves 56c and 56d are connected to the second groove 58b. That is, the first grooves 56a and 56b communicate with the outside air via the second groove 58a, and the first grooves 56c and 56d communicate with the outside air via the second groove 58b. Accordingly, the cavity defining recess 44 is connected to the outside air via the overflow portions 52a to 52d and the vent 54 (the first grooves 56a to 56d and the second grooves 58a and 58b).

  Air nozzles 64a and 64b (gas supply means) for discharging compressed air as blowing gas are disposed above the second grooves 58a and 58b, respectively. The air nozzles 64a and 64b are connected to the upper openings 62a and 62b of the second grooves 58a and 58b through a guide tube (not shown). Therefore, the second grooves 58a and 58b are blown by the compressed air discharged from the air nozzles 64a and 64b.

  Further, the second protrusion 50 is formed with an entry recess 66 into which the second sliding mold 20 enters.

  In the above configuration, the movable body 32 is provided with a drive mechanism such as a cylinder (not shown). The movable platen 14 is displaced so as to approach or separate from the fixed platen 12 under the action of this drive mechanism.

  As shown in FIG. 1, the first sliding mold 18, the second sliding mold 20, and the third sliding mold 22 are fixed to the fixed mold 26 and the movable mold 34 on the lower, right, and upper sides of the second divided mold 38. It is arrange | positioned so that it can approach / separate with respect to. This approach / separation is also performed by a drive mechanism (not shown). During so-called mold clamping, the movable mold 34, the first sliding mold 18, the second sliding mold 20, and the third sliding mold 22 abut against the fixed mold 26, thereby forming the cavity 16. The The lower openings 60 a and 60 b of the second grooves 58 a and 58 b are formed at positions where the second grooves 58 a and 58 b are not blocked by the first sliding mold 18.

  And in the vicinity of the lower openings 60a and 60b, a capture container 68 for capturing powder burrs is arranged.

  The casting apparatus 10 including the movable mold 34 (casting mold) according to the present embodiment is basically configured as described above. Next, the function and effect will be described.

  When performing the casting operation, as described above, the movable mold 34, the first sliding mold 18, the second sliding mold 20, and the third sliding mold 22 are displaced so as to approach the fixed mold 26. Touch. That is, so-called mold clamping is performed, and thereby the cavity 16 is defined. The second sliding mold 20 enters the entry recess 66 formed in the second protrusion 50 of the movable mold 34.

  At this time, compressed air is discharged from the air nozzles 64a and 64b. The discharged compressed air is guided by the guide tube and is introduced into the second grooves 58a and 58b from the upper openings of the second grooves 58a and 58b. At this time, the atmosphere as gas exists in the cavity 16.

  Molten metal is introduced into the cavity 16 formed in this way from a pouring port 28 formed in the stationary-side main body 24. The molten metal passes through the runner 30 formed in the fixed mold 26 and reaches the cavity 16, and begins to fill the cavity 16.

  As the molten metal is introduced into the cavity 16, the atmosphere present in the cavity 16 is pressed. The pressed air reaches the first grooves 56 a to 56 d and further the second grooves 58 a and 58 b via the overflow parts 52 a to 52 d communicating with the cavity 16. The gas that has reached the second grooves 58a and 58b moves along with the compressed air introduced into the second grooves 58a and 58b as described above and moves to the lower openings 60a and 60b. From 60b, the air is exhausted to the outside of the second split mold 38, that is, into the outside air.

  The molten metal is filled in the cavity 16 and the molten metal overflows and is stored in the overflow portions 52a to 52d, so that all of the air existing in the cavity 16 is exhausted through the vent 54, or , Remaining in the first grooves 56a to 56d.

  The molten metal filling the cavity 16 is cooled and solidified as a predetermined time elapses. Thereby, the cast product 70 is obtained.

  While the molten metal is cooled and solidified, powder burrs are generated by the fine granular molten metal that has entered the first grooves 56a to 56d through the overflow portions 52a to 52d. Since compressed air circulates through the second grooves 58a and 58b, the outlets of the first grooves 56a to 56d, that is, the vicinity of the communication port that joins the second grooves 58a and 58b have a negative pressure. For this reason, dust burrs are sucked into the second grooves 58a and 58b and introduced into the second grooves 58a and 58b, and are further accompanied by the compressed air flowing through the second grooves 58a and 58b, and the lower openings 60a and 60b. Discharged from. In addition, when the powder burr | flash generate | occur | produces not in the 1st groove | channels 56a-56d but 2nd groove | channel 58a, 58b, this powder burr | flash is accompanied by the compressed air which distribute | circulates to the 2nd groove | channel 58a, 58b, lower opening 60a, It is discharged from 60b. As described above, the powder burrs are discharged to the outside of the casting apparatus 10 through the vent 54, that is, to the outside air.

  In the prior art, the vent is formed so as to extend vertically upward from the cavity, and the powder burr is sent vertically upward to be discharged from the opening above the vent. As described above, the powder burrs are fed to the second grooves 58a and 58b through the first grooves 56a to 56d bent in a "<" shape, and then vertically along the second grooves 58a and 58b. I'm trying to send it down. Accordingly, the powder burr is prevented from rising toward the third sliding mold 22.

  In addition, the distance from the outlets of the first grooves 56a to 56d (communication ports joining the second grooves 58a and 58b) to the upper end surface of the second split mold 38 (the contact surface with respect to the third sliding mold 22) is This is longer than when a vent extending vertically upward from the cavity 16 toward the upper end surface of the second split mold 38 is formed. Combined with this, it becomes difficult for the powder burr to rise toward the third sliding mold 22.

  For this reason, it is avoided that a powder burr is interposed between the second divided mold 38 and the third sliding mold 22 that contacts the upper end surface of the second divided mold 38. It is possible to prevent the powder burr from biting into the mating surface with the third sliding mold 22. Therefore, it is possible to avoid the third sliding mold 22 from being damaged or the third sliding mold 22 from malfunctioning.

  For this reason, it is possible to increase the cross-sectional area of the first grooves 56a to 56d so that the air easily passes therethrough. Even if dust burrs occur in the first grooves 56a to 56d, it is difficult for the dust burrs to reach the mating surfaces of the second split mold 38 and the third sliding mold 22 for the reasons described above. is there. Therefore, according to the movable mold | type 34 which concerns on this Embodiment, it becomes easy to exhaust air | atmosphere.

  Even if compressed air is not supplied to the second grooves 58a and 58b, the powder burrs generated in the first grooves 56a to 56d are transferred to the second grooves 58a and 58b via the first grooves 56a to 56d. Then, it falls toward the lower openings 60a and 60b of the second grooves 58a and 58b under the action of gravity. That is, also in this case, it is possible to discharge the powder burr to the outside air.

  The powder burrs discharged from the lower openings 60 a and 60 b may be captured by the capture container 68. This prevents powder burrs from being scattered in the outside air, so that the working environment can be kept clean.

  Then, mold opening is performed. That is, the first sliding mold 18, the second sliding mold 20, and the third sliding mold 22 are separated from the fixed mold 26 and the movable mold 34, and the movable mold 34 is separated from the fixed mold 26. The product 70 is exposed.

  In the above-described embodiment, the second grooves 58a and 58b extend along the vertical direction. However, the second grooves 58a and 58b may be inclined as long as the powder burr can fall by its own weight.

  Of course, the casting apparatus 10 is not particularly limited to the one for obtaining a cast product having the shape shown in FIG.

  Furthermore, you may make it form a 1st groove | channel as a straight line which inclines at a predetermined angle with respect to a perpendicular direction, and goes to the 2nd groove | channels 58a and 58b from the overflow parts 52a-52d.

  Furthermore, the blowing gas supplied to the second grooves 58a and 58b is not limited to compressed air, and may be other gases such as compressed nitrogen.

DESCRIPTION OF SYMBOLS 10 ... Casting apparatus 12 ... Fixed platen 14 ... Movable platen 16 ... Cavity 18 ... 1st sliding type 20 ... 2nd sliding type 22 ... 3rd sliding type 26 ... Fixed type 34 ... Movable type 36 ... 1st division type 38 ... 2nd division type 44 ... Cavity definition recessed part 46 ... Cavity definition part 52a-52d ... Overflow part 54 ... Vent 56a-56d ... 1st groove | channel 58a, 58b ... 2nd groove | channel 60a, 60b ... Lower opening 62a, 62b ... Upper opening 64a, 64b ... Air nozzle 68 ... Capture vessel 70 ... Cast product

Claims (4)

A casting mold in which a vent for exhausting gas from the cavity when filling the cavity with molten metal,
The vent communicates with the cavity and has a first groove having a portion extending in a direction other than the vertical direction;
A second groove that communicates with the first groove and opens at both a lower end surface and an upper end surface of the casting mold;
A casting mold characterized by comprising:   2. The casting mold according to claim 1, further comprising a gas supply means for supplying a blowing gas to the second groove.   3. The mold according to claim 1, wherein a plurality of the first grooves are formed, a single second groove is formed, and the plurality of first grooves communicate with the one second groove. A casting mold characterized by that.   The mold according to any one of claims 1 to 3, wherein the second groove extends along a vertical direction.

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