JP2013188788A - Casting mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a casting mold that has a small and simple configuration, with which a hollow section is accurately formed by means of a core.SOLUTION: A casting mold includes: a core 20 having a support part 26 and supported in a cavity 15 by the support part 26; an upper mold 41; a lateral mold 51 having a drive key 56, combined with the upper mold 41 to form the cavity 15, and supporting the support part 26 from below; a presser weight 61 provided at the upper mold 41; and a counter weight 71 coupled to the presser weight 61 via a link mechanism 66 and having a greater weight than that of the presser weight 61. The drive key 56 lifts up the counter weight 71 while the upper mold 41 and the lateral mold 51 are combined with each other, thus the presser weight 61 is positioned where the presser weight presses the support part 26 from above.

Description

  The present invention generally relates to a casting mold, and more particularly to a casting mold including a core for manufacturing a casting having a hollow portion.

  Regarding a conventional casting mold, for example, Japanese Patent Application Laid-Open No. 5-253663 discloses a cylinder head casting apparatus for the purpose of preventing lift and displacement of a port core for an intake port. (Patent Document 1).

  The cylinder head casting apparatus disclosed in Patent Document 1 includes a clamp member for pressing and positioning a port core against a lower mold. The clamp member is provided in a horizontal shape. The rod member is pushed in according to the clamping operation between the pair of horizontal molds, and the slide displacement of the rod member is converted into the vertical movement displacement and transmitted to the clamp member. Thereby, a clamp member moves to the position which presses a port core.

JP-A-5-253663

  A method of manufacturing a casting having a hollow portion by providing a core in a cavity in a mold is known. In such a casting method, if the position of the core is shifted due to buoyancy generated when molten metal is injected into the cavity, the position accuracy of the hollow portion to be obtained is not sufficiently ensured.

  As a means for solving such a problem, in the cylinder head casting apparatus disclosed in Patent Document 1 described above, a movable clamp member is provided in a horizontal type. However, in a casting apparatus having such a structure, since a mechanism for pressing the core is built in the horizontal type, the mechanism tends to be large and complicated. In particular, when casting a cylinder head of a direct injection engine, since the intake port formed using the core has a raised shape, the size of the mechanism becomes significant.

  Accordingly, an object of the present invention is to solve the above-described problems, and to provide a casting mold in which a hollow portion by a core is accurately formed with a small and simple configuration.

  A casting mold according to the present invention includes a core, an upper mold, a horizontal mold, a first weight member, and a second weight member. The core has a support portion and is supported in the cavity by the support portion. The horizontal mold has a key member. The horizontal mold is combined with the upper mold to form a cavity, and supports the support portion from below. The first weight member is provided in the upper mold. The second weight member is connected to the first weight member via a link mechanism. The second weight member has a weight greater than that of the first weight member. In a state where the upper mold and the horizontal mold are combined, the key member lifts the second weight member, so that the first weight member is positioned at a position for pressing the support portion from above.

  According to the casting mold configured in this manner, the support portion is pressed from above by the first weight member in a state where the upper mold and the horizontal mold are combined. Positional displacement can be prevented, and the hollow portion formed by the core can be formed with high accuracy. At this time, since the mechanism for pressing the support portion is realized by a structure interlocked with the operation of combining the upper mold and the horizontal mold, the mechanism can be made small and simple.

  Preferably, when the horizontal mold is detached from the upper mold, the first weight member is positioned at a position separated from the support portion by the weight of the second weight member. According to the casting mold configured as described above, the first weight member does not press the support portion from above in a state in which the horizontal die that supports the support portion from below is detached. Thereby, it can prevent that a support part is damaged at the time of detachment | leave of a horizontal metal mold | die.

  Preferably, a through hole is formed in the upper mold. The first weight member is disposed in the through hole so as to be movable up and down. According to the casting mold configured as described above, the first weight member is not built in the upper mold, and therefore the mold can be downsized.

  Preferably, the cavity has a shape corresponding to a cylinder head of a direct injection engine. An intake port is formed by the core. According to the casting mold configured as described above, any of the effects described above can be achieved in the casting mold for manufacturing the cylinder head of the direct injection engine.

  As described above, according to the present invention, it is possible to provide a casting mold in which a hollow portion by a core is accurately formed with a small and simple configuration.

It is an exploded assembly figure which shows the metal mold | die for casting in embodiment of this invention. It is sectional drawing which shows the metal mold | die for casting along the II-II line | wire in FIG. It is sectional drawing for demonstrating the flow of the casting process using the metal mold | die for casting in FIG. It is another sectional view for demonstrating the flow of the casting process using the metal mold | die for casting in FIG. FIG. 6 is still another cross-sectional view for explaining the flow of a casting process using the casting mold in FIG. 1.

  Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are denoted by the same reference numerals.

  FIG. 1 is an exploded view showing a casting mold according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a casting mold along the line II-II in FIG. Referring to FIGS. 1 and 2, a casting mold 10 in the present embodiment is a mold for producing a cylinder head of an engine by casting. The casting mold 10 is a mold for producing, in particular, a cylinder head of a direct injection engine by casting.

  The casting mold 10 includes a lower mold 31, an upper mold 41, and a horizontal mold 51. The lower mold 31, the upper mold 41, and the horizontal mold 51 are combined with each other to form a cavity 15 into which a molten metal such as an aluminum alloy is injected.

  The upper mold 41 and the lower mold 31 are arranged to face each other in the vertical direction. As shown by an arrow 101 in FIG. 1, the upper mold 41 is combined with the lower mold 31 from above. As shown by the arrow 102 in FIG. 1, the horizontal mold 51 is combined with the lower mold 31 from the side (horizontal direction). The combination direction of the upper mold 41 and the combination direction of the horizontal mold 51 are orthogonal to each other.

  The casting mold 10 further has a core 20. The core 20 is provided to form an intake port that is a hollow portion in the cylinder head. The core 20 is disposed in the cavity 15. The core 20 includes an intake port core 21 as a core main body, an intake port baseboard 27, and a baseboard support leg 28.

  The intake port core 21 has a shape corresponding to the intake port formed in the cylinder head. The lower mold 31 has a top surface 31a. The intake port core 21 has a shape that rises from the top surface 31 a and extends toward the horizontal mold 51. The intake port core 21 has a shape extending in a vertically upward oblique direction from the top surface 31a.

  The intake port skirting board 27 and the skirting board support leg 28 constitute a support part 26 for supporting the intake port core 21 at a predetermined position in the cavity 15 where the intake port is to be formed. More specifically, the intake port baseboard 27 extends like a bowl at a position spaced from the top surface 31a. The baseboard support legs 26 extend upward from the top surface 31 a and are connected to the intake port baseboard 27. The intake port skirting board 27 and the skirting board support leg 26 are combined in a gate shape on the top surface 31a. The intake port core 21 is connected to the intake port baseboard 27 at the point where it rises from the top surface 31a. The intake port core 21 is supported at both ends by a lower mold 31 and an intake port baseboard 27.

  The horizontal mold 51 has a drive key 56 and a baseboard mounting table 52. The baseboard mounting table 52 functions as a mounting table on which the intake port core 21 is mounted and supports the intake port core 21 from below. The baseboard mounting table 52 is arranged closer to the cavity 15 than the drive key 56 in the direction in which the horizontal mold 51 is combined. The baseboard mounting table 52 is formed integrally with the horizontal mold 51. The drive key 56 functions as a key member for operating the presser weight 61 described later in conjunction with the operation of combining the upper mold 41 and the horizontal mold 51. The drive key 56 may be formed integrally with the horizontal mold 51, or may be provided as a separate component from the horizontal mold 51 and attached to the horizontal mold 51 with a bolt or the like.

  The casting mold 10 further includes a presser weight 61, a link mechanism 66, and a counter weight 71. The presser weight 61, the link mechanism 66, and the counter weight 71 are provided on the upper mold 41. The presser weight 61, the link mechanism 66, and the counter weight 71 together with the drive key 56 provided on the horizontal mold 51 constitute a mechanism for pressing the baseboard mounting table 52 from above during casting.

  A through hole 42 is formed in the upper mold 41. The through hole 42 is formed so as to penetrate the upper mold 41 in the vertical direction. The pressing weight 61 is disposed in the through hole 42 so as to be movable up and down. The pressing weight 61 has a column shape extending in the vertical direction. The counter weight 71 has a weight larger than that of the presser weight 61.

  The link mechanism 66 has an arm shape extending in one direction, and a presser weight 61 and a counterweight 71 are connected to one end and the other end, respectively. The link mechanism 66 has a rotation shaft 67. The link mechanism 66 is rotatably supported with respect to the upper mold 41 on the rotation shaft 67. In the present embodiment, the rotating shaft 67 is provided between the connection position with the presser weight 61 and the connection position with the counter weight 71. With such a configuration, the presser weight 61 and the counterweight 71 move in the opposite directions as the link mechanism 66 rotates.

  3 to 6 are sectional views for explaining the flow of a casting process using the casting mold in FIG. Next, the operation of the casting mold 10 will be described.

  With reference to FIG. 2, first, the core 20 including the intake port core 21, the intake port baseboard 27 and the baseboard support leg 26 is set to the lower mold 31. At this time, both the upper mold 41 and the horizontal mold 51 are separated from the lower mold 31.

  Referring to FIG. 3, next, in order to start casting, the horizontal mold 51 is slid in the horizontal direction and combined with the lower mold 31. At this time, the baseboard mounting table 52 provided in the horizontal mold 51 is positioned directly below the intake port baseboard 27. As a result, the intake port skirting board 27 is supported from below by the skirting board mounting table 52.

  Next, referring to FIG. 4, the upper mold 41 is lowered and combined with the horizontal mold 51 and the lower mold 31.

  The counter weight 71 has a weight larger than that of the presser weight 61. Therefore, before the upper mold 41 is combined with the horizontal mold 51 and the lower mold 31, the counter weight 71 is disposed below the rotation shaft 67, and the presser weight 61 is disposed above the rotation shaft 67. Has been placed.

  As the upper mold is lowered, the counter weight 71 is lifted upward by coming into contact with the drive key 56 provided on the horizontal mold 51. Along with this, the presser weight 61 connected to the counter weight 71 via the link mechanism 66 moves downward and is positioned directly above the intake port baseboard 27. Thus, the intake port skirting board 27 is supported from below by the skirting board mounting table 52 and is pressed from above by the presser weight 61.

  Casting is performed with the upper mold 41 and the horizontal mold 51 combined with the lower mold 31. At this time, since the suction port skirting board 27 is pressed by the pressing weight 61 from above, the core 20 does not rise due to buoyancy when the molten metal is injected into the cavity 15. Further, since the intake port skirting board 27 is supported by the skirting table mounting base 52 from below, the intake port skirting board 27 is not damaged by the pressing force from the presser weight 61. For this reason, the position shift of the core 20 at the time of casting can be prevented reliably.

  Referring to FIG. 5, after the casting is completed, the horizontal mold 51 is moved in the horizontal direction and separated from the upper mold 41 and the lower mold 31.

  At this time, the counterweight 71 is lowered as the drive key 56 is removed along with the detachment of the horizontal mold 51. As a result, the presser weight 61 moves upward and is positioned at a position away from the intake port baseboard 27. As a result, since the suction port base 27 is eliminated from the pressing force from the presser weight 61, it is possible to avoid damage to the intake port base 27 that has lost its support by the base support 52.

  In the casting mold 10 according to the present embodiment, the mechanism for pressing the baseboard mounting table 52 including the pressing weight 61, the link mechanism 66, the counter weight 71, and the drive key 56 includes the upper mold 41 and the horizontal mold. This is realized by a structure linked with the operation of combining the mold 51. For this reason, the mechanism for pressing the baseboard mounting table 52 can be made small and simple.

  The structure of the casting mold according to the embodiment of the present invention described above will be described together. The casting mold according to the present embodiment has a support portion 26, and the support portion 26 enters the cavity 15. A horizontal die having a core 20 to be supported, an upper die 41, and a drive key 56 as a key member, which is combined with the upper die 41 to form the cavity 15, and supports the support portion 26 from below. 51, a presser weight 61 as a first weight member provided in the upper mold 41, and a second weight member connected to the presser weight 61 via the link mechanism 66 and having a weight larger than that of the presser weight 61. The counter weight 71 is provided. In a state where the upper mold 41 and the horizontal mold 51 are combined, the drive key 56 lifts the counter weight 71, whereby the presser weight 61 is positioned at a position to press the support portion 26 from above.

  According to the casting mold 10 configured as described above, the core 20 is prevented from being displaced by pressing the suction port base 27 with the pressing weight 61 during casting. Thereby, the intake port can be formed in the cylinder head with high positional accuracy. Further, the casting die 10 can be reduced in size and cost by making the mechanism for pressing the baseboard mounting table 52 small and simple. In particular, in the case of a cylinder head of a direct injection engine, since the intake port has a raised shape, the mold tends to be tall. For this reason, the casting mold 10 in the present embodiment is used more effectively.

  In this embodiment, the casting mold 10 for manufacturing the cylinder head of the engine has been described. However, the present invention is not limited to this, and can be applied to various casting molds having a core. It is.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention is mainly applied to a casting mold having a core for producing a casting having a hollow portion.

  10 casting molds, 15 cavities, 20 cores, 21 intake port cores, 26 baseboard support legs, 26 support parts, 27 intake port baseboards, 28 baseboard support legs, 31 lower molds, 31a top surface, 41 Upper mold, 42 Through-hole, 51 Horizontal mold, 52 Baseboard mounting table, 56 Drive key, 61 Presser weight, 66 Link mechanism, 67 Rotating shaft, 71 Counterweight

Claims (4)

A core having a support and supported in the cavity by the support;
Upper mold,
A horizontal mold that has a key member, is combined with the upper mold to form the cavity, and supports the support portion from below;
A first weight member provided in the upper mold;
A second weight member connected to the first weight member via a link mechanism and having a weight greater than that of the first weight member;
In a state where the upper mold and the horizontal mold are combined, the key member lifts the second weight member, so that the first weight member is positioned at a position for pressing the support portion from above. Mold.   2. The casting according to claim 1, wherein when the horizontal mold is detached from the upper mold, the first weight member is positioned at a position separated from the support portion by its own weight of the second weight member. Mold. A through hole is formed in the upper mold,
The casting mold according to claim 1, wherein the first weight member is disposed in the through hole so as to be movable up and down. The cavity has a shape corresponding to a cylinder head of a direct injection engine,
The casting mold according to any one of claims 1 to 3, wherein an intake port is formed by the core.

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