JP7623987B2 - Die Casting Molds - Google Patents

Description

The present invention relates to a die casting mold equipped with a core.

Pressure acts on the front of the core from the molten metal injected into the cavity. This pressure causes the core to move backwards. If the core moves, the precision of the product will deteriorate. Therefore, a mechanism is provided in die casting dies to prevent the core from moving backwards.

In the mold described in Patent Document 1 below, a stopper portion is provided on the wall surface of the recess of the fixed mold, and a protrusion is provided on the core that protrudes toward the fixed mold in the mold clamping direction. When the mold is clamped, the stopper portion of the fixed mold abuts against the back surface of the protrusion of the core, thereby preventing the core from retracting.

However, if a large pressure acts on the front surface of the core, the core may move. In addition, a rotational moment is likely to occur in the core with the stopper part as the fulcrum.

Patent No. 4330646

The objective of the present invention is to reliably prevent the core from retracting.

The die-casting die according to the present invention is a die-casting die in which a fixed die is provided with a core support surface for preventing the core from retracting, and a core mating surface where the core abuts against the fixed die in the mold clamping direction, rearward of the core support surface in the core fore-and-aft direction. The fixed die has a protruding portion that protrudes toward the movable die in the mold clamping direction beyond the core mating surface, and the protruding portion is provided with an extended support surface that extends the core support surface toward the movable die in the mold clamping direction. Note that the core fore-and-aft direction is the direction in which the core slides relative to the movable die, with the direction approaching the movable die being the front side and the direction away from the movable die being the rear side.

According to this configuration, the fixed mold has a protrusion, and an extended support surface is provided on the protrusion. Therefore, the core is supported by the core support surface, which includes the extended support surface. Since the extended support surface is located on the movable mold side in the mold clamping direction relative to the core mating surface, the extended support surface effectively absorbs the pressure acting on the core by the molten metal.

In particular, it is preferable that the protrusion reach the movable die, and that both the fixed die and the movable die prevent the core from retracting. With this configuration, the fixed die and the movable die work together to prevent the core from retracting from both sides in the die clamping direction, so the core is prevented from retracting more reliably. This further improves the precision of the product.

The protrusion preferably has an extended support surface and a support wall that supports the core from the rear side in the fore-and-aft direction of the core, and a side wall that extends from one edge of the support wall to the front side in the fore-and-aft direction of the core. With this configuration, the side wall is provided on one edge of the support wall, improving the strength of the protrusion and enabling it to firmly support the core.

It is also preferable that a pair of extended support surfaces are provided at both ends of the core support surface in the left-right direction of the core. The left-right direction of the core is a direction perpendicular to the front-rear direction of the core and the mold clamping direction. With this configuration, the core can be prevented from retreating evenly in the left-right direction of the core. It also makes it easier to arrange piping for cooling the mold.

The fixed mold preferably comprises a fixed mold body having a mating recess, and a columnar support member having a protruding portion and removably attached to the fixed mold body with its base portion fitting into the mating recess. With this configuration, the support member fits into the mating recess, so that the support member can be firmly fixed to the fixed mold body, and the core can be firmly supported by the support member. In addition, the support member can be replaced, which provides excellent maintainability for the mold.

As described above, the extended support surface effectively prevents the core from retracting.

FIG. 2 is a perspective view showing a fixed mold of a die casting mold according to an embodiment of the present invention. FIG. FIG. 4 is a front view of the fixed mold as viewed from the movable mold side in the mold clamping direction. FIG. 4 is a perspective view showing a movable die of the die casting die. FIG. 4 is a perspective view showing a support member of the die casting die. 4A and 4B are perspective views showing a support member of the die casting die in a die-open state and a die-closed state, respectively. FIG. 4 is a cross-sectional view showing the die casting mold in an open state. FIG. 4 is a cross-sectional view showing the die-casting die in a clamped state.

The die-casting mold according to one embodiment of the present invention will be described below with reference to Figures 1 to 8. Hereinafter, the die-casting mold will be simply referred to as the mold.

The mold comprises a fixed mold 1, a movable mold 2, and a core 3. In this embodiment, as an example, the core 3 is provided in one location, but the number of cores 3 is arbitrary. The fixed mold 1 and the movable mold 2 are arranged opposite each other. The movable mold 2 approaches and moves away from the fixed mold 1 in the mold clamping direction. The movable mold 2 approaches the fixed mold 1 when the mold is clamped, and moves away from the fixed mold 1 when the mold is opened. The mold clamping direction is the direction in which the movable mold 2 approaches and moves away from the fixed mold 1. The mold clamping direction is, for example, a horizontal direction. In the figure, the mold clamping direction is indicated by the symbol Z, the core front-to-rear direction, which is the sliding direction of the core 3, is indicated by the symbol X, and the core left-to-right direction, which is the direction perpendicular to the mold clamping direction Z and the core front-to-rear direction X, is indicated by the symbol Y.

<Fixed type 1>
1 to 3 show the fixed die 1. Note that the left side of the entire fixed die 1 as viewed from the page surface is omitted from the illustration. In other words, the left side of the fixed die 1 is shown in a cut-away state. The same is true for the movable die 2.

The fixed mold 1 is equipped with a fixed die 1a that defines a cavity for forming a product, and a fixed holder 1b to which the fixed die 1a is attached and which holds the fixed die 1a. In Figs. 1 to 3, the fixed die 1a is indicated by a number of dots. The front view of the fixed mold 1 is taken from the movable mold 2 side in the mold clamping direction Z. The front of the fixed holder 1b is the end face of the fixed holder 1b on the movable mold 2 side in the mold clamping direction Z. The front of the fixed holder 1b is provided with a first main mating surface 10 on which the movable holder 2b described below overlaps in the mold clamping direction Z when the mold is clamped, and a first core mating surface 11 on which the core holder 3b described below overlaps in the mold clamping direction Z when the mold is clamped. The first core mating surface 11 is provided with a number of piping grooves 12 through which cooling piping (not shown) for cooling the mold passes.

The fixed holder 1b is provided with an engagement recess 13. The engagement recess 13 is located between the first core mating surface 11 and the fixed die 1a. As shown in Figs. 7 and 8, the engagement recess 13 engages with the engagement protrusion 32 of the core 3 described below in the mold clamping direction Z. The engagement recess 13 is recessed in the mold clamping direction Z from the first core mating surface 11, and is also recessed in the mold clamping direction Z from the first main mating surface 10. The engagement recess 13 is recessed from the front toward the fixed die 1 side in the mold clamping direction Z, that is, toward the back side of the fixed die 1 and away from the movable die 2, and opens toward the movable die 2 side in the mold clamping direction Z. The opening shape of the engagement recess 13 is a rectangle that is long in the core left-right direction Y when viewed from the front. The first core mating surface 11 is adjacent to the rear side of the engagement recess 13 in the core front-rear direction X, and the fixed die 1a is adjacent to the front side of the engagement recess 13 in the core front-rear direction X.

A core support surface 14 for stopping the core 3 from retracting is provided on the wall surface of the engagement recess 13. The core support surface 14 is provided on the fixed holder 1b. The core support surface 14 constitutes the rear wall surface of the engagement recess 13 in the core front-rear direction X. In other words, the entire rear wall surface of the engagement recess 13 in the core front-rear direction X serves as the core support surface 14. The core support surface 14 has a length covering the entire length of the engagement recess 13 in the core left-right direction Y. The core support surface 14 is inclined in the core front-rear direction X with respect to the mold clamping direction Z. The core support surface 14 is inclined so as to gradually move toward the rear side of the core front-rear direction X from the fixed mold 1 toward the movable mold 2 in the mold clamping direction Z.

The core support surface 14 is composed of a base support surface 14a and an extended support surface 14b. The base support surface 14a is a part that constitutes the wall surface of the engagement recess 13, and its upper end is at the same height as the first core mating surface 11. In other words, the base support surface 14a is the part of the core support surface 14 that is in the range from the height of the bottom surface of the engagement recess 13 to the height of the first core mating surface 11. The extended support surface 14b is extended from the base support surface 14a to the movable mold 2 side in the mold clamping direction Z. The extended support surface 14b and the base support surface 14a are the same inclined surface, and the extended support surface 14b is continuous with the base support surface 14a. The extended support surface 14b is a part of the core support surface 14 that protrudes toward the movable mold 2 side in the mold clamping direction Z beyond the first core mating surface 11. The configuration of the core support surface 14 will be described in more detail below.

The fixed holder 1b comprises a fixed holder main body 20 and a support member attached to the fixed holder main body 20 in a detachable, i.e. replaceable, manner. In this embodiment, the fixed holder main body 20 constitutes the fixed mold main body. The support member has a core support surface 14. When the mold is closed, the support member abuts against the core 3 to support the core 3 from the rear side in the core front-rear direction X. The support member is divided into multiple parts in the core left-right direction Y. The support member consists of multiple, specifically three, plate-shaped first support members 21 arranged in the center of the engagement recess 13 in the core left-right direction Y, and a pair of columnar second support members 22 arranged at both ends of the engagement recess 13 in the core left-right direction Y.

The three first support members 21 are arranged in line in the left-right direction Y of the core. The three first support members 21 are arranged between a pair of second support members 22. The upper end of the first support member 21 (the end on the movable mold 2 side in the mold clamping direction Z) is located at the height of the first core mating surface 11, and the upper surface of the first support member 21 and the first core mating surface 11 are flush with each other. The above-mentioned piping groove 12 is continuous with the upper surface of the first support member 21. The front surface of the first support member 21 is the front surface in the core front-rear direction X. A first inclined surface 23 is provided on the front surface of the first support member 21. The first inclined surface 23 is the base support surface 14a. The first inclined surface 23 occupies the majority of the base support surface 14a. The first inclined surface 23 extends from the bottom surface of the engagement recess 13 to the upper surface of the first support member 21. The thickness of the first support member 21 in the core front-rear direction X gradually becomes thinner toward the upper side, that is, from the bottom surface of the engagement recess 13 toward the first core mating surface 11.

The second support members 22 are located on both sides of the first support member 21 in the left-right direction Y of the core. The pair of second support members 22 are arranged symmetrically with respect to each other in the left-right direction Y of the core. The pair of second support members 22 have approximately symmetrical shapes with respect to each other. One of the second support members 22 is shown in Figures 5 and 6. The second support member 22 has a shape that is elongated in the mold clamping direction Z. The mold clamping direction Z will be described as the up-down direction.

The second support member 22 has a longer vertical dimension than the first support member 21. The second support member 22 has a base portion 24 that is generally rectangular in plan view, and a support wall portion 25 and a side wall portion 26 that extend upward from the base portion 24. The base portion 24 is located at the lower end of the second support member 22. The base portion 24 is embedded in the fixed holder body 20 when the second support member 22 is attached to the fixed holder body 20. The height of the upper end of the base portion 24 is generally the same as the height of the bottom surface of the engagement recess 13.

The support wall portion 25 supports the core 3 from the rear side in the core front-rear direction X. The support wall portion 25 is aligned with the first support member 21. The support wall portion 25 has a second inclined surface 27 on its front surface. The second inclined surface 27 constitutes the core support surface 14 together with the first inclined surface 23 of the first support member 21. The second inclined surface 27 is the same inclined surface as the first inclined surface 23. By providing the second inclined surface 27 on the front surface of the support wall portion 25, the thickness of the support wall portion 25 in the core front-rear direction X gradually becomes thinner toward the upper side. The thickness of the support wall portion 25 in the core front-rear direction X is the thinnest at its upper end. The support wall portion 25 is wedge-shaped as a whole. The second inclined surface 27 is provided over the entire length of the support wall portion 25 in the vertical direction, and reaches the upper end of the support wall portion 25, i.e., the upper end of the second support member 22.

The side wall portion 26 extends from one side edge of the support wall portion 25 in the left-right direction Y of the core toward the front side of the core front-rear direction X. The side wall portion 26 is provided on only one of the two side edges of the support wall portion 25 in the left-right direction Y of the core. The side wall portion 26 extends at a right angle to the support wall portion 25. That is, the side wall portion 26 is perpendicular to the support wall portion 25 in a plan view, and the support wall portion 25 and the side wall portion 26 are L-shaped in a plan view. When the second support member 22 is attached to the fixed holder body 20, the side wall portion 26 is located on the opposite side of the core left-right direction Y to the first support member 21. The side wall portions 26 of the pair of second support members 22 face each other in the left-right direction Y of the core. The length of the side wall portion 26 in the core front-rear direction X of the core gradually increases from the lower end to the upper end, and is longest at the upper end of the second support member 22. The side wall portion 26 is in an inverted triangular shape. The thickness of the side wall portion 26 in the left-right direction Y of the core is approximately constant and the side wall portion 26 is plate-shaped. The inner surface of the side wall portion 26 of the second support member 22 is connected to the second inclined surface 27 and is bent at a right angle to the second inclined surface 27.

The fixed holder body 20 is provided with a fitting recess 28 into which the root portion 22a of the second support member 22 fits. The fitting recess 28 has a shape corresponding to the second support member 22 in a front view, specifically a rectangular shape. The root portion 22a of the second support member 22 is the lower portion of the second support member 22, and is approximately half of the total length in the vertical direction. The fitting recess 28 is located behind the engagement recess 13 in the core front-rear direction X and adjacent to both ends in the core left-right direction Y. The fitting recess 28 opens to the movable mold 2 side in the mold clamping direction Z. A portion of the fitting recess 28 extends from the engagement recess 13 to the outside in the core left-right direction Y in a front view. The lateral extension portion 28a of the fitting recess 28 is formed to cut out the first main mating surface 10 in the core left-right direction Y in a rectangular shape. By fitting the base portion 22a of the second support member 22 into the fitting recess 28, the second support member 22 is supported by the fixed holder body 20 in two directions, the core front-rear direction X and the core left-right direction Y. In particular, the side wall portion 26 of the second support member 22 fits into the lateral extension portion 28a of the fitting recess 28. By fitting the side wall portion 26 into the lateral extension portion 28a, the second support member 22 is held by the fixed holder body 20 in the core front-rear direction X. The inner surface of the side wall portion 26 of the second support member 22 is flush with the wall surface of the engagement recess 13 in the core left-right direction Y.

The upper part of the second support member 22 protrudes toward the movable mold 2 in the mold clamping direction Z beyond the first core mating surface 11. The upper part of the second support member 22 is a protruding portion 22b that protrudes beyond the first core mating surface 11. The upper region of the second inclined surface 27 at the protruding portion 22b is the extended support surface 14b. The lower region of the second inclined surface 27 other than the protruding portion 22b is the base support surface 14a. The first inclined surface 23 of the first support member 21 and the lower region of the second inclined surface 27 constitute the base support surface 14a.

<Movable mold 2 and core 3>
4 shows the movable die 2 and the core 3 approaching the movable die 2. The movable die 2 includes a movable die 2a that defines a cavity together with the fixed die 1a, and a movable holder 2b to which the movable die 2a is attached and which holds the movable die 2a. The front view shows the movable die 2 as viewed from the fixed die 1 side in the mold clamping direction Z. The front of the movable holder 2b is the end face of the movable holder 2b on the fixed die 1 side in the mold clamping direction Z. The front of the movable holder 2b is provided with a second main mating surface 30 that overlaps with the first main mating surface 10 of the fixed holder 1b in the mold clamping direction Z when the mold is clamped.

The core 3 slides toward and away from the movable die 2. The direction in which the core 3 approaches and moves away is the core front-rear direction X. In this embodiment, the core front-rear direction X is a direction perpendicular to the mold clamping direction Z, but it may be a direction intersecting the mold clamping direction Z. The core 3 includes a core die 3a that defines a cavity together with the fixed die 1a and the movable die 2a, and a core holder 3b to which the core die 3a is attached and which holds the core die 3a. In FIG. 4, the core die 3a is indicated by a number of dots. The front of the core holder 3b is the end face of the core holder 3b on the fixed die 1 side in the mold clamping direction Z. The front of the core holder 3b is provided with a second core mating surface 31 that overlaps the first core mating surface 11 of the fixed holder 1b in the mold clamping direction Z when the mold is clamped.

The core holder 3b is provided with an engagement protrusion 32. The engagement protrusion 32 protrudes in the mold clamping direction Z beyond the second core mating surface 31, and also protrudes in the mold clamping direction Z beyond the second main mating surface 30. The engagement protrusion 32 is located between the second core mating surface 31 and the core die 3a. The second core mating surface 31 is adjacent to the rear side of the engagement protrusion 32 in the core front-rear direction X, and the core die 3a is adjacent to the front side of the engagement protrusion 32 in the core front-rear direction X. The engagement protrusion 32 engages with the engagement recess 13 of the fixed holder 1b in the mold clamping direction Z during mold clamping. The shape of the engagement protrusion 32 in a front view corresponds to the shape of the engagement recess 13 in a front view. Behind the engaging protrusion 32 in the core front-rear direction X and on both sides of the second core mating surface 31 in the core left-right direction Y, there are gaps 33 recessed in the mold clamping direction Z from the second core mating surface 31. The gaps 33 are the space between the core holder 3b and the movable holder 2b. When the mold is clamped, the protrusions 22b of the second support member 22 enter the pair of left and right gaps 33 in the mold clamping direction Z.

An abutment surface 34 is provided on the rear surface of the engaging protrusion 32, which is the rear surface in the core front-rear direction X. The abutment surface 34 abuts against the core support surface 14 of the engaging recess 13 when the mold is closed. The entire rear surface of the engaging protrusion 32 serves as the abutment surface 34. The abutment surface 34 has a length that covers the entire length of the engaging protrusion 32 in the core left-right direction Y. The abutment surface 34 is inclined to correspond to the core support surface 14. In other words, the abutment surface 34 is inclined in the core front-rear direction X with respect to the mold closing direction Z. The abutment surface 34 is inclined so as to gradually move toward the front side of the core front-rear direction X from the movable mold 2 toward the fixed mold 1 in the mold closing direction Z.

The abutment surface 34 consists of a base abutment surface 34a and an extended abutment surface 34b. During mold clamping, the base abutment surface 34a abuts against the base support surface 14a of the fixed mold 1, and the extended abutment surface 34b abuts against the extended support surface 14b of the fixed mold 1. The base abutment surface 34a is made up of the rear surface of the engaging protrusion 32, and its upper end is at the same height as the upper end of the engaging protrusion 32, and its lower end is at the same height as the second core mating surface 31. In other words, the base abutment surface 34a is the range of the abutment surface 34 from the upper end of the engaging protrusion 32 to the second core mating surface 31. The extended abutment surface 34b extends from the base abutment surface 34a to the movable mold 2 side in the mold clamping direction Z, that is, to the back side of the movable mold 2. The extended abutment surface 34b and the base abutment surface 34a form the same inclined surface. The extended abutment surface 34b is a portion of the abutment surface 34 that extends toward the rear surface of the movable die 2 beyond the second core mating surface 31. The configuration of the abutment surface 34 will be described in more detail below.

The core holder 3b is provided with a removably, i.e. replaceably, attached abutment members. The abutment members have abutment surfaces 34. When the mold is closed, the abutment members abut against the support members of the fixed mold 1. The abutment members are divided into a plurality of parts in the left-right direction Y of the core, and are also divided in the mold closing direction Z. In this embodiment, the abutment members are composed of a plurality of, specifically three, plate-shaped first abutment members 41 arranged on the rear surface of the engaging protrusion 32, and a pair of left and right plate-shaped second abutment members 42 arranged facing the pair of gaps 33.

The three first abutment members 41 are arranged side by side in the left-right direction Y of the core. The three first abutment members 41 constitute the entire rear surface of the engagement protrusion 32. A third inclined surface 43 is provided on the entire rear surface of the first abutment member 41. The third inclined surface 43 is the base abutment surface 34a. The third inclined surface 43 is inclined corresponding to the first inclined surface 23. The thickness of the first abutment member 41 in the core front-rear direction X gradually becomes thinner toward the upper side. The second abutment member 42 is arranged on the rear side of the movable mold 2 with respect to the first abutment members 41 located at both ends. The pair of second abutment members 42 are arranged symmetrically with each other in the core left-right direction Y. The pair of second abutment members 42 have approximately symmetric shapes with each other. The width of the second abutment member 42 in the core left-right direction Y is narrower than that of the first abutment member 41. A fourth inclined surface 44 is provided on the rear surface of the second abutment member 42. The fourth inclined surface 44 is the extended abutment surface 34b. The fourth inclined surface 44 is inclined to correspond to the second inclined surface 27. The fourth inclined surface 44 is flush with the third inclined surface 43. The fourth inclined surface 44 continues from the third inclined surface 43 to the rear surface side of the movable mold 2.

During mold clamping, the third inclined surface 43 of the core holder 3b abuts against the first inclined surface 23 of the first support member 21 of the fixed holder 1b and the lower region of the second inclined surface 27 of the second support member 22. The fourth inclined surface 44 of the core holder 3b abuts against the upper region of the second inclined surface 27 of the second support member 22 of the fixed holder 1b.

As shown in FIG. 8, when the mold is closed, the protruding portion 22b of the second support member 22 passes through the core 3 in the mold closing direction Z and reaches the movable mold 2. Specifically, the tip of the protruding portion 22b reaches the movable holder 2b. The movable holder 2b is provided with a receiving recess 45 that communicates with the above-mentioned gap 33. When the core holder 3b slides in the core front-rear direction X, the core holder 3b slides on the core sliding surface 46 of the movable holder 2b. The receiving recess 45 is provided on the core sliding surface 46 of the movable holder 2b and opens to the fixed mold 1 side in the mold closing direction Z. When the mold is closed, the tip of the protruding portion 22b of the second support member 22 enters the receiving recess 45.

A receiving member 47 is disposed on the wall surface of the receiving recess 45 of the movable holder 2b so as to be detachable, i.e. replaceable. As shown in FIG. 6, the receiving member 47 is plate-shaped. When the mold is closed, the receiving member 47 abuts against the tip of the protruding portion 22b of the second support member 22 from the rear side in the core front-rear direction X, and supports the second support member 22 from the rear side. The receiving member 47 has a vertical piece 47a extending in the mold closing direction Z (the up-down direction of the second support member 22) and a horizontal piece 47b extending in the core left-right direction Y, and is formed in an L-shape. The receiving member 47 is formed in an L-shape so that the core 3 can pass when the core 3 advances and retreats in the core front-rear direction X relative to the movable mold 2 when the mold is opened. In Figures 7 and 8, the vertical piece 47a is shown by a two-dot chain line because it is on the front side of the paper, and similarly, the side wall portion 26 of the second support member 22 is also shown by a two-dot chain line because it is on the front side of the paper.

Figure 8 shows the mold clamping state. A large pressure is applied from the molten metal to the front surface of the core die 3a (the surface that defines the cavity). In Figure 8, the arrow P indicates the case where the pressure is a concentrated load. The pressure is directed toward the rear side of the core front-rear direction X, and causes the core 3 to move backward. Furthermore, the point of application of this pressure as a concentrated load (the position of the arrow P) is located on the movable mold 2 side in the mold clamping direction Z rather than the first and second core mating surfaces 11, 31. Therefore, a moment acts on the core 3 with the corners 48 of the engagement recess 13 and engagement protrusion 32 as the fulcrum, as indicated by the arrow M.

In response to this, the core 3 is supported not only by the base support surface 14a, but also by the extended support surface 14b of the second support member 22. Therefore, even if pressure acts on the core 3, the core 3 is reliably prevented from moving backward, and the core 3 is also prevented from rotating or tilting due to moment M. In addition, because a pair of second support members 22 are provided on the left and right, the core 3 can be supported evenly in the left-right direction Y of the core.

In particular, the second support member 22 reaches the movable holder 2b and is supported from the rear side of the core in the front-rear direction X by the receiving member 47 of the movable holder 2b. Therefore, the fixed holder 1b and the movable holder 2b are connected by a pair of second support members 22 on the left and right, and the core 3 is supported by both the fixed holder 1b and the movable holder 2b via the second support members 22. This reliably prevents the core 3 from moving backward.

The thickness of the support wall portion 25 of the second support member 22 gradually becomes thinner toward the movable mold 2, but the side wall portion 26 is provided and reinforces the support wall portion 25. Therefore, the strength of the protruding portion 22b of the second support member 22 can be sufficiently ensured. In particular, the width of the side wall portion 26 in the core front-rear direction X gradually increases toward the movable mold 2, and is widest at the tip of the second support member 22, so that the strength of the tip of the second support member 22 can be sufficiently ensured.

Furthermore, since the second support member 22 fits into the fitting recess 28, the second support member 22 can be firmly attached to the fixed holder 1b. In particular, since the side wall portion 26 of the second support member 22 fits into the lateral extension portion 28a of the fitting recess 28, the second support member 22 is less likely to swing in the core front-rear direction X, and is firmly held in the fixed holder body 20.

In this embodiment, the fixed holder 1b is provided with a separate first support member 21 and a separate second support member 22, but the core support surface 14 may be provided integrally with the fixed holder 1b. Similarly, the core holder 3b is provided with a separate first abutment member 41 and a separate second abutment member 42, but the abutment surface 34 may be provided integrally with the core holder 3b. Also, the movable holder 2b is provided with a separate receiving member 47, but the movable holder 2b may directly support the second support member 22.

REFERENCE SIGNS LIST 1 Fixed mold 1a Fixed die 1b Fixed holder 2 Movable mold 2a Movable die 2b Movable holder 3 Core 3a Core die 3b Core holder 10 First main mating surface 11 First core mating surface 12 Groove 13 Engagement recess 14 Core support surface 14a Base support surface 14b Extended support surface 20 Fixed holder body (fixed mold body)
21 First support member 22 Second support member 22a Root portion 22b Protruding portion 23 First inclined surface 24 Base portion 25 Support wall portion 26 Side wall portion 27 Second inclined surface 28 Fitting recess 28a Lateral extension portion 30 Second main mating surface 31 Second core mating surface 32 Engaging protrusion portion 33 Gap 34 Abutment surface 34a Base abutment surface 34b Extended abutment surface 41 First abutment member 42 Second abutment member 43 Third inclined surface 44 Fourth inclined surface 45 Receiving recess 46 Core sliding surface 47 Receiving member 47a Vertical piece portion 47b Horizontal piece portion 48 Angle X Core front-rear direction Y Core left-right direction Z Mold clamping direction

Claims (5)

A die casting mold in which a fixed mold is provided with a core support surface for preventing a core from moving backward, and a core mating surface where the core abuts against the fixed mold in a mold clamping direction, the core being located rearward of the core support surface in a front-rear direction of the core,
The core support surface has a base support surface and an extended support surface extended from the base support surface toward the movable mold side in the mold fastening direction,
the fixed die has an engagement recess that is recessed toward the fixed die in a mold fastening direction relative to the core mating surface and engages with the engagement protrusion of the core, and a protrusion that protrudes toward the movable die in the mold fastening direction relative to the core mating surface,
The core mating surface is adjacent to the rear side of the engagement recess in the front-rear direction of the core,
The base support surface constitutes a rear wall surface of the engagement recess in the front-rear direction of the core, and the extended support surface is provided on the protrusion,
When the die is closed, the tip of the protrusion reaches the movable die, and the movable die supports the tip of the protrusion from the rear side in the front-to-rear direction of the core, thereby preventing the core from retracting together with the fixed die. 2. The die casting mold according to claim 1, wherein the movable mold has a receiving recess into which the tip of the protrusion fits when the mold is closed, and a receiving member is replaceably arranged on a wall surface of the receiving recess to support the tip of the protrusion from the rear side in the fore-and-aft direction of the core when the mold is closed . The die casting mold according to claim 1 or 2, wherein the protrusion has an extended support surface, a support wall portion that supports the core from the rear side in the fore-and-aft direction of the core, and a side wall portion that extends from one side edge of the support wall portion to the front side in the fore-and-aft direction of the core. The die casting mold according to claim 1 or 2, wherein a pair of extended support surfaces are provided at both ends of the core support surface in the left-right direction of the core. The die casting mold according to claim 1 or 2, wherein the fixed mold comprises a fixed mold body having a fitting recess, and a columnar support member having a protrusion and removably attached to the fixed mold body such that the base portion fits into the fitting recess.

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