JP4850206B2 - Vacuum die casting mold and vacuum die casting method - Google Patents

Description

  The present invention relates to a vacuum die casting mold and a vacuum die casting method.

  As the vacuum die casting mold, a fixed mold having a fixed holder and a fixed die, a movable mold that can move forward and backward with respect to the fixed mold, and a movable holder and a movable die, and a direction that intersects the moving direction of the movable mold 2. Description of the Related Art A structure having a slide core including a core holder and a core die is known.

  In the case of the vacuum die casting mold having the slide core as described above, the sealing member cannot make a round around the cavity and seal it, and it is difficult to make the cavity vacuum. In order to overcome this, for example, a vacuum die casting mold as described in JP-A-8-57623 (Patent Document 1) has been proposed.

  In the die for vacuum die casting described in Patent Document 1, the fixed die and the movable die each have a movable die contact surface and a fixed die contact surface that can face each other, and the fixed die has a fixed die. A convex portion protruding from the movable die contact surface is provided, and a through hole is formed in the convex portion. A core die is inserted into the through hole to penetrate the through hole. Moreover, the recessed part which can engage the convex part of a fixed die | dye is formed in the fixed die contact surface of a movable die | dye. With the core die inserted into the through hole and passing through the through hole, the movable die abutting surface and the fixed die abutting surface come into contact with each other so that clamping is performed, and the fixed die and the movable die A cavity is defined by the child die.

In addition, a seal member is disposed between the movable die contact surface and the fixed die contact surface so as to surround the cavity, and when the inside of the cavity is in a vacuum state when performing vacuum die casting, It is configured so that air in the atmosphere can be prevented from flowing in.
JP-A-8-57623

  However, the vacuum die casting mold of Patent Document 1 described above employs a configuration in which a through hole is formed in a convex portion provided on either the fixed die or the movable die, and a core die is inserted into the through hole. In addition, since the fixed die or the movable die is provided with a convex portion in which such a through-hole is formed or a concave portion corresponding to the convex portion, it is necessary to make the fixed die and the movable die large, and the design and Processing also takes time.

  In addition, it is necessary to prevent the molten metal from entering from the cavity between the through hole of the convex portion provided in the fixed die or the movable die and the core die inserted into the through hole. High accuracy is required for the insertion state of the core die into the hole. If the accuracy is low, the core die cannot be inserted into the through hole, or when the molten metal enters and burrs are generated and the core die is slid, that is, when the core die is advanced or retracted with respect to the through hole, There arises a problem that it becomes an obstacle of the slide.

  In addition, as described above, one of the fixed die and the movable die is provided with a convex portion in which a through hole is formed, and the other is formed with a concave portion. When a plurality of slide cores are provided, such a convex portion is provided. A plurality of parts and recesses are provided around the cavity. Although cooling systems such as cooling holes for flowing cooling water are often arranged around the cavities, it is difficult to arrange the cooling system when such convex parts and concave parts exist around the cavity.

  Therefore, the present invention provides a die for vacuum die casting that can seal the cavity and vacuum the cavity without special processing of the fixed die and the movable die even when the slide core is provided. It is another object of the present invention to provide a vacuum die casting method.

In order to achieve the above object, the present invention provides a fixed mold having a fixed holder 30 and a fixed die, a movable mold that can move forward and backward with respect to the fixed mold, and has a movable holder 10 and a movable die, and the movable mold. The slide has a core holder 20 and a core die that can be advanced and retracted in a direction crossing the advancing and retracting direction of the mold, and a cavity is defined by the fixed die, the movable die, and the core die. in the vacuum die casting mold which, movable holder 10 has a convex portion 12 that protrudes toward the fixed holder facing surface 11A and the fixing frame facing surface 11A in the forward direction of the movable type, the movable holder one the portions a part convex portion 12 is provided a through hole 10c penetrating the moving direction of the slide core is formed, the said fixing frame facing surface 11A before the slide core A slide groove 10d extending from one end opening of the through hole 10c in the direction is formed, the other end of the through hole 10c in the retracting direction of the slide core opens at the outer surface of the movable holder 10, and the fixed holder 30 is The movable holder 10 has a movable holder facing surface 31A that abuts against the fixed holder facing surface 11A of the movable holder 10 when the cavity is defined, and the movable holder facing surface 31A has a protrusion engaging recess 30c and the movable holder 10 when the cavity is defined. And the core holder 20 is accommodated in the through hole 10c and the slide groove 10d, and is accommodated in the through hole 10c and the slide groove 10d. A base 21 having a base surface 21A that is flush with the fixed holder facing surface 11A and faces the movable holder facing surface 31A. A protrusion 23 protruding from the base surface 21A in the forward direction of the movable mold and engaged with the protrusion engaging recess 30c when the cavity is defined, and an end of the base 21 in the retracting direction of the slide core And a flange-shaped lid portion 22 having a flat surface 22A that abuts around the other end opening of the through hole 10c in the retracting direction of the slide core when the cavity is defined. The portion on the side of the portion 22 and the portion on the side of the projecting portion 23 are configured to be separable, and between the movable holder facing surface 31A and the fixed holder facing surface 11A and the convex portion 12 so as to surround the cavity. And the portion of the fixed holder 30 that defines the recess 30a, and the movable holder 10 is provided so as to surround the other end opening of the through hole 10c in the retracting direction of the slide core. And the lid A vacuum die casting mold provided with a second seal member between the portions 22 is provided.
The present invention also includes a fixed mold having a fixed holder 30 and a fixed die, a movable mold that can move forward and backward with respect to the fixed mold, a movable holder 10 and a movable die, and a crossing direction of the movable mold. A die for vacuum die casting, which has a slide core including a core holder 20 and a core die, and which defines a cavity by the fixed die, the movable die and the core die. The movable holder 10 has a fixed holder facing surface 11A and a convex portion 12 projecting from the fixed holder facing surface 11A in the forward direction of the movable mold, and the movable holder is moved forward and backward. A through hole 10c penetrating in the direction is formed, and a slide groove 10 extending from one end opening of the through hole 10c in the forward direction of the slide core is formed on the fixed holder facing surface 11A. There is formed, the other end of the through hole 10c in the backward direction of the slide core is open at the movable holder 10 the outer surface, the convex portion is detachable from the said fixing frame facing surface, the movable holder The through hole is formed by connecting to the fixed holder facing surface so as to cover the slide groove portion in the vicinity of the outer surface, and the fixed holder 30 is fixed to the fixed holder facing surface of the movable holder 10 when the cavity is defined. 11A has a movable holder facing surface 31A that abuts on the movable holder facing surface 31A, and a projecting portion engaging recess 30c and a recess 30a in which the projecting portion 12 of the movable holder 10 can be engaged when the cavity is defined. When formed, the core holder 20 is accommodated in the through hole 10c and the slide groove 10d, and is accommodated in the through hole 10c and the slide groove 10d. A base portion 21 having a base surface 21A that is flush with the fixed holder facing surface 11A and faces the movable holder facing surface 31A, and projects from the base surface 21A in the forward direction of the movable mold, and the projecting portion is engaged when the cavity is defined. A protrusion 23 that engages with the joint recess 30c and an opening at the other end of the through hole 10c that is provided at the end of the base 21 in the retracting direction of the slide core and in the retracting direction of the slide core when defining the cavity A flange-shaped lid portion 22 having a flat surface 22A that contacts the periphery of the movable holder, and between the movable holder facing surface 31A and the fixed holder facing surface 11A and the convex portion 12 so as to surround the cavity. A first seal member is provided between the portion of the fixed holder 30 that defines the recess 30a, and surrounds the other end opening of the through hole 10c in the retracting direction of the slide core. In addition, a vacuum die casting mold is provided in which a second seal member is provided between the movable holder 10 and the lid portion 22.

  The present invention also provides a vacuum die casting method in which vacuum die casting is performed using the vacuum die casting mold.

According to the vacuum die casting mold of claim 1 of the present invention and the vacuum die casting method of claim 3, the movable holder has a fixed holder facing surface and a convex protruding from the fixed holder facing surface in the forward direction of the movable mold. A part of the movable holder that is provided with a convex portion is formed with a through-hole penetrating in the advancing and retreating direction of the slide core. A slide groove extending from one end opening of the through hole in the forward direction is formed, the other end of the through hole in the backward direction of the slide core opens at the outer surface of the movable holder, and the fixed holder is a fixed holder of the movable holder when the cavity is defined There is a movable holder facing surface that abuts the facing surface, and the movable holder facing surface has a protrusion engaging concave portion and a concave portion with which the convex portion of the movable holder can be engaged when the cavity is defined. The core holder is housed in the through hole and the slide groove, and has a base surface that is flush with the fixed holder facing surface and faces the movable holder facing surface when housed in the through hole and the slide groove. A base, a protrusion protruding from the base surface in the forward direction of the movable mold and engaging the protrusion engaging recess when defining the cavity, and provided at the end of the base in the retracting direction of the slide core and sliding while defining the cavity A flange-shaped lid portion having a flat surface that contacts the periphery of the other end opening of the through hole in the retracted direction of the child, and the base portion is configured to be divided into a portion on the lid portion side and a portion on the protruding portion side. A first seal member is provided between the movable holder facing surface and the fixed holder facing surface so as to surround the cavity, and between the fixed holder portion that defines the convex portion and the concave portion, and the slide core is moved backward. Direction Since the second seal member is provided between the movable holder and the lid so as to surround the other end opening of the through hole in the fixed hole, the fixed die, the movable die and the core die need not be specially processed. . Moreover, since a high precision is not required when forming a through-hole in a movable holder, a movable holder can be manufactured easily.
In addition, since it is not necessary to perform special processing on the movable die and the fixed die, the degree of freedom in arranging a cooling system such as a cooling hole for flowing cooling water can be increased.

According to the vacuum die casting mold of claim 2 of the present invention and the vacuum die casting method of claim 3, of the vacuum die casting mold of claim 1 of the present invention, the vacuum die casting method of claim 2 of the present invention. For example, the movable holder has a fixed holder facing surface and a convex portion protruding from the fixed holder facing surface toward the movable forward movement direction, and the movable holder has a through-hole penetrating in the forward and backward direction of the slide core. A slide groove extending from one end opening of the through hole in the forward direction of the slide core is formed on the surface facing the fixed holder, and the other end of the through hole in the backward direction of the slide core is opened on the outer surface of the movable holder, The protrusion is detachable from the fixed holder facing surface, and is connected to the fixed holder facing surface so as to cover the slide groove near the outer surface of the movable holder. The fixed holder has a movable holder facing surface that abuts against the fixed holder facing surface of the movable holder when the cavity is defined, and the projecting portion engaging concave portion and the convex portion of the movable holder are engaged with the movable holder facing surface when the cavity is defined. A core holder is accommodated in the through hole and the slide groove, and is flush with the fixed holder facing surface when the core holder is accommodated in the through hole and the slide groove. A base having opposing base surfaces, a protrusion protruding from the base surface in the movable forward direction and engaging the protrusion engaging recess when defining the cavity, and an end of the base in the retracting direction of the slide core A flange-shaped lid portion having a flat surface that abuts the periphery of the other end opening of the through hole in the retracting direction of the slide core when defining the cavity so as to surround the cavity The first seal member is provided between the movable holder facing surface and the fixed holder facing surface, and between the fixed holder portion defining the convex portion and the concave portion, and the other end of the through hole in the retracting direction of the slide core Since the second seal member is provided between the movable holder and the lid so as to surround the opening, it is not necessary to perform special processing on the fixed die, the movable die, and the core die. Moreover, since a high precision is not required when forming a through-hole in a movable holder, a movable holder can be manufactured easily.

  A vacuum die casting mold according to an embodiment of the present invention will be described with reference to FIG. The vacuum die casting mold includes a fixed mold (not shown), a movable mold (not shown), and a slide core (not shown). A cavity is defined in a vacuum die casting mold by a fixed die (not shown), a movable die (not shown), and a core die (not shown) of a slide core, which will be described later. Yes.

  The movable mold (not shown) includes a movable holder 10 and a movable die (not shown) as shown in FIG. 1, and is movable so as to face the movable mold (not shown) and to be in contact with a fixed mold dividing surface 31 described later. A mold dividing surface 11 is provided. The movable dividing surface 11 is oriented substantially in the left-right direction in FIG. 1, and the movable dividing surface 11 is fixed to a fixed holder facing surface 11A capable of facing and abutting against a movable holder facing surface 31A of a fixed holder 30 described later. It is constituted by a fixed die facing surface (not shown) of a movable die (not shown) that is flush with the holder facing surface 11A. In FIG. 1, the core holder 20 and the fixed holder 30 are disposed above the movable holder 10 for convenience of explanation, but in actuality, the lower left in FIG. 1 coincides with the vertically lower side, and the upper right in FIG. The direction is aligned vertically upward, and the direction connecting the upper left and lower right in FIG. 1 corresponds to the horizontal direction.

  In a movable mold having a movable holder (not shown), the movable holder 10 and a movable die (not shown) are integrally formed in a direction perpendicular to the movable mold dividing surface 11 and a fixed mold dividing surface 31 described later, that is, in the vertical direction in FIG. The movable mold (not shown) advances upward in FIG. 1 and the movable mold dividing surface 11 and a fixed mold dividing surface 31 (to be described later) are brought into contact with each other. A new cavity is defined. Further, the movable mold including the movable holder is configured to be opened by retreating downward in FIG. 1 so that the movable mold dividing surface 11 and a fixed mold dividing surface 31 described later are separated from each other. In FIG. 1, only half of the movable holder 10 is shown, and the remaining half corresponding to the upper left position in the drawing is omitted for convenience of explanation.

  On the fixed holder facing surface 11 </ b> A of the movable holder 10, a movable die accommodating portion 10 a capable of accommodating a movable die (not shown) is formed. The movable die housing portion 10a is formed of a recess recessed from the fixed holder facing surface 11A, and when the movable die (not shown) is housed, the fixed die facing surface and the fixed holder facing surface 11A (not shown) of the movable die (not shown). And become the same as described above.

  Further, on the fixed holder facing surface 11 </ b> A of the movable holder 10, a convex portion 12 is provided at the edge of the movable holder 10 that protrudes in the movable forward direction, that is, upward in FIG. 1. The convex portion 12 protrudes in a substantially trapezoidal shape from the fixed holder facing surface 11A, and the first extends across the protruding end surface 12A and the protruding end surface 12A and the pair of inclined surfaces 12B and 12B connecting the fixed holder facing surface 11A. A seal groove 10b is formed. The first seal groove 10b extends from the slope 12B to the fixed holder facing surface 11A, and is formed so as to surround a cavity (not shown) on the fixed holder facing surface 11A as it is. In the first seal groove 10b, a movable holder facing surface 31A and a fixed holder facing surface 11A, which will be described later, and a portion of the fixed holder 30 that defines a convex portion 12 and a concave portion 30a of the fixed holder 30, which will be described later. A first seal member (not shown) that seals the gap is provided.

  Further, a through hole 10c is formed in a portion of the movable holder 10 where the convex portion 12 is provided. The through-hole 10c is formed so as to penetrate a portion where the convex portion 12 of the movable holder 10 is provided so as to be directed in the advancing / retreating direction of the slide core, which will be described later, that is, the direction connecting the convex portion 12 and the movable die housing portion 10a. Has been. One end of a through-hole 10c in the forward direction of a slide core (not shown), which will be described later, is open to communicate with a slide groove 10d formed on the fixed holder facing surface 11A so as to communicate with the movable die housing portion 10a. . The other end of the through hole 10c in the backward direction of the slide core described later opens at the outer surface of the movable holder 10.

  A second seal groove 10e is formed around the opening at the other end of the through hole 10c in the retracting direction of the slide core, which will be described later, and is not shown in the second seal groove 10e. A second seal member is provided. The second seal member (not shown) is configured to seal around the opening by abutting against the lid portion 22 of the core holder 20 as will be described later. A movable recess (not shown) made of a recess is formed on the surface of the movable die (not shown) facing the fixed die (not shown).

  In addition, the movable mold (not shown) is provided with an extrusion pin (not shown). An unillustrated extrusion pin can project from the surface of a movable die (not shown) that defines a cavity (not shown). When the mold is clamped and a cavity (not shown) is defined, the front end surface of the extrusion pin (not shown) is flush with the surface of the movable die part that defines the cavity, and the mold is opened to move from the movable mold (not shown). When the cast product is taken out, it is configured to protrude from the surface of the movable die.

  In addition, a diverter (not shown) is provided in the movable type (not shown). A diverter (not shown) is arranged to face one end of a sleeve (not shown) described later, and this position forms one end of a runway (not shown). The other end of the runner (not shown) communicates with a cavity (not shown) through a gate (not shown).

  A core holder 20 that is connected to a core die (not shown) and forms a slide core together with a core die (not shown) is accommodated in the slide groove 10d. As shown in FIG. 1, the core holder 20 has a base portion 21, a lid portion 22, and a protruding portion 23. The base portion 21 has a substantially rectangular parallelepiped shape and is substantially the same shape as the groove portion. The base portion 21 moves forward and backward in the longitudinal direction of the base portion 21 along the slide groove 10d and in a direction intersecting with a movable advance / retreat direction (not shown). Is possible. More specifically, the base 21 of the core holder 20 that is integral with a core die (not shown) can move forward in the slide groove 10d in a direction from the through hole 10c toward the movable die housing portion 10a, The inside of the slide groove 10d can be retracted in the direction from the 12 movable die accommodating portions 10a toward the through hole 10c.

  The upper surface 21A shown in FIG. 1 of the base 21 in the slide groove 10d is flush with the fixed holder facing surface 11A of the movable holder 10. The upper surface 21A corresponds to a base surface. A portion near the end of the base portion 21 in the retracting direction of the core holder 20 is inserted into the through hole 10c of the movable holder 10 and penetrates the through hole 10c. The base 21 is configured to be split into two at a split position 21B in the vicinity of the center in the longitudinal direction, and is connected to each other by a bolt or the like (not shown). Therefore, the core holder 20 includes a part composed of one part of the base part 21 divided into two parts and a protrusion provided integrally with the one part, the other part of the base part 21 divided into two parts, and the other part. It is comprised by the part which consists of the cover part 22 mentioned later provided integrally in this part.

  The lid portion 22 is provided at one end portion of the base portion 21 of the core holder 20 in the retracting direction of the core holder 20. The lid portion 22 is provided so as to protrude in a flange shape at the one end portion, and the end surface 22A on the base side in the advancing / retreating direction of the core holder 20 forms a flat surface. The end surface 22A on the base side is not shown when the core holder 20 advances and a core die (not shown) forms a cavity (not shown) together with a fixed die (not shown) and a movable die (not shown). The slide core is configured to abut around the opening at the end of the through hole 10c in the retracting direction of the slide core through a second seal member (not shown).

  A connecting rod (not shown) is connected to the end surface of the lid 22 opposite to the base, and the connecting rod (not shown) is connected to a piston rod of a cylinder (not shown) via a coupling (not shown). The core holder 20 is configured to advance and retract when a cylinder (not shown) is driven.

  The protrusion 23 is provided at one end of the base 21 of the core holder 20 in the forward direction of the core holder 20. The projecting portion 23 is provided so as to project from the upper surface 21A shown in FIG. 1 of the base portion 21 in the forward direction of the movable holder 10, and when the mold is clamped and a cavity (not shown) is defined, It is configured to engage with a protrusion engaging recess 30c of a fixed holder 30 to be described later, and to prevent a slide core (not shown) from retreating. More specifically, the end surface of the protrusion 23 in the retracting direction of the core holder 20 forms a protrusion inclined surface 23A, and the protrusion 23 protrudes when engaged with the protrusion engaging recess 30c of the fixed holder 30. A concave portion inclined surface 30B parallel to the protruding portion inclined surface 23A is formed in the portion of the protruding portion engaging concave portion 30c facing the partial inclined surface 23A. When the protruding portion inclined surface 23A and the recessed portion inclined surface 30B are in surface contact with each other, a slide core (not shown) is prevented from moving backward.

  A core die (not shown) is connected and fixed to the tip of the core holder 20 in the forward direction of the slide core (not shown) by a bolt or the like (not shown). Further, when the core holder 20 moves forward, the tip of the core holder 20 comes into contact with a part of a movable die (not shown) so that the core die (not shown) is positioned.

  The fixed mold (not shown) includes a fixed holder 30 and a fixed die (not shown), and has a fixed mold dividing surface 31 that faces the movable mold and can contact the movable mold dividing surface 11. The fixed mold dividing surface 31 is oriented substantially in the left-right direction in FIG. 1, and the fixed mold dividing surface 31 is opposed to the movable holder facing surface 31 </ b> A capable of facing and contacting the fixed holder facing surface 11 </ b> A of the movable holder 10. The surface 31A and a fixed die (not shown) that are flush with each other are configured with a movable die facing surface (not shown). In FIG. 1, only half of the fixing holder 30 is shown, and the remaining half corresponding to the upper left position in the figure is not shown for convenience of explanation.

  A part of the movable holder facing surface 31 </ b> A that is opposed to the convex part 12 of the movable holder 10 is formed with a concave part 30 a that matches the shape of the convex part 12 and can be engaged with the convex part 12. When the core holder 20 moves forward and is clamped, and the core die (not shown) forms a cavity (not shown) together with a fixed die (not shown) and a movable die (not shown), the convex portion 12 is formed in the concave portion 30a. Engage.

  Further, a fixed die housing portion 30b that is recessed upward from the movable holder facing surface 31A in FIG. 1 is formed in a portion of the movable holder facing surface 31A that faces the movable die housing portion 10a of the movable holder 10. ing. The fixed die accommodating portion 30b can accommodate a fixed die (not shown), and when the fixed die (not shown) is accommodated, the movable die facing surface and the movable holder facing surface of the fixed die (not shown). 31A is configured to be flush with each other.

  Further, a part of the movable holder facing surface 31A, the core holder 20 is advanced and the mold is clamped, and a core die (not shown) opens a cavity (not shown) together with a fixed die (not shown) and a movable die (not shown). A protrusion engaging recess 30c that matches the shape of the protrusion 23 and that can be engaged with the protrusion 23 is formed in the portion of the core holder 20 that faces the protrusion 23 when formed. A fixed die recess (not shown) formed of a recess is formed on the movable die facing surface of the fixed die (not shown). A groove (not shown) is formed by a part of the fixed mold recess (not shown) and a part of the movable mold recess (not shown) at the time of clamping, and a core die (not shown) is inserted into the groove (not shown). A cavity (not shown) is defined by the fixed mold recess, the aforementioned movable mold recess (not shown), and a part of the core die (not shown).

  In addition, a fixed mold (not shown) is provided with a sleeve (not shown) in which a hot water supply port (not shown) is formed and a plunger tip (not shown) that can slide in the sleeve (not shown). It is possible to supply molten metal such as molten aluminum alloy.

  In addition, a not-shown dividing surface recess is formed in the fixed mold dividing surface 31, and a not-shown vacuum valve that forms a passage for exhausting air in the cavity (not shown) is formed in the not-shown dividing surface recess. It is inset. In a state where a vacuum valve (not shown) is fitted in a not-shown split surface recess, a part of the vacuum valve (not shown) that faces the movable split surface 11 is flush with the fixed split surface 31. It is comprised so that it may become. A vacuum tank (not shown) connected to a vacuum measuring sensor (not shown) is connected to a vacuum valve (not shown) via a pipe member (not shown) and a valve (not shown). A vacuum tank for vacuum die casting (not shown) can be used to evacuate a cavity (not shown).

  With the above configuration, the cavity can be sealed and the cavity can be evacuated without special processing of the fixed die, the movable die, and the core die. Moreover, since the high precision is not requested | required when forming the convex part 12 and the through-hole 10c in the movable holder 10, the movable holder 10 can be manufactured easily.

  In addition, since it is not necessary to perform special processing on the movable die and the fixed die, the degree of freedom in arranging a cooling system such as a cooling hole for flowing cooling water can be increased.

  Next, the vacuum die casting method will be described. In the vacuum die casting method, first, one part constituting the base part 21 of the core holder 20 that can be divided into two is inserted into the through hole 10c of the movable holder 10, and the one part and the other part of the base part 21 are inserted. Are connected to each other so that the base 21 penetrates the through hole 10c and the base 21 is accommodated in the slide groove 10d, whereby the slide core is set in the movable holder 10.

  Next, with respect to the movable die (not shown) of the vacuum die casting mold with the die opened, the cylinder holder (not shown) is driven to advance the core holder 20 to advance the slide core (not shown). . As a result, the tip end of the core holder 20 contacts a part of a movable die (not shown) and is positioned, and the end surface 22A on the base side of the lid portion 22 is in the retracting direction of the slide core (not shown). It abuts around the opening at the end of the through hole 10c via a second seal member (not shown).

  Next, the movable mold / movable holder 10 and the slide core / core holder 20 are moved toward the fixed mold / fixed holder 30 to bring the movable mold dividing surface 11 closer to the fixed mold dividing surface 31. The mold 12 is brought into contact with the mold, and the convex portion 12 of the movable holder 10 is engaged with the concave portion 30a of the fixed holder 30, and the protruding portion 23 of the core holder 20 is engaged with the protruding portion engaging concave portion 30c. Further, a first seal member (not shown) is provided between the movable holder facing surface 31A and the fixed holder facing surface 11A and between the convex portion 12 and a portion of the fixed holder 30 that defines a concave portion 30a of the fixed holder 30 described later. Seal with.

  Next, a molten metal such as an aluminum alloy is supplied to a hot water supply port (not shown) of a sleeve (not shown). Then, a plunger tip (not shown) is advanced at a low speed, and the hot water inlet is closed by the plunger tip.

  Next, the vacuum die casting vacuum tank evacuates a cavity (not shown) through a vacuum valve (not shown), a pipe member (not shown), and a valve (not shown). Next, the forward speed of the plunger tip (not shown) is switched to a high speed, and the molten metal is injected and filled into a cavity (not shown) through a runner and a gate (not shown).

  Next, after the molten metal in the cavity is cooled and solidified, the movable mold (not shown), the slide core (not shown), and the cast product (not shown) attached thereto are separated from the fixed mold (not shown). Open. Next, the core holder 20 is moved backward by driving a cylinder (not shown). Then, the product is pushed out from a movable die (not shown) by an extrusion pin (not shown). The above is the vacuum die casting method.

  The die for vacuum die casting and the vacuum die casting method according to the present invention are not limited to the above-described embodiments, and various modifications and improvements can be made within the scope described in the claims. For example, the configuration of the movable holder and the core holder is not limited to the configuration according to the present embodiment.

  More specifically, as shown in FIG. 2, the convex portion 112 may be provided on the movable holder 110 by connecting the convex portion 112 having a substantially trapezoidal shape at a position to be the through hole 10 c. That is, the slide groove 10d is formed to reach the outer surface of the movable holder 110 in the retracting direction of the core holder 120 (FIG. 3), and is shown in the opening in the fixed holder facing surface 11A of the portion of the slide groove 10d near the outer surface. The projection 112 is connected so as to cover from above, so that the portion of the slide groove 10d near the outer surface forms a through-hole 10c that penetrates the core holder 120 in the forward and backward direction at the portion of the projection 112. May be.

  By doing so, the base 121 of the core holder 120 is not required to be divided into two parts. For example, as shown in FIG. 3, the base part 121 can be divided into the cover part 122, the base part 121, and the protruding part 23. It can be. Here, the cover part 122 and the other end with respect to one end of the base part 121 provided with the protruding part 23 are connected by a bolt or the like (not shown).

  That is, after the movable die is accommodated in the movable die accommodating portion 10a, the tip of the core holder 120 comes into contact with the movable die, so that when the base 121 is long in the longitudinal direction as shown in FIG. The core holder 120 cannot be moved in a long distance in the slide groove 10d in the direction of the movable die housing portion 10a. For this reason, in the movable holder 10 provided with the convex portion 12 of the present embodiment as shown in FIG. 1, in the case of a long configuration in which the base 121 cannot be divided into two as shown in FIG. The base 121 cannot be inserted into 10c.

  However, as shown in FIG. 2, by forming the convex portion 112 separately from the movable holder 110, the base portion 121 of the core holder 120 is previously accommodated in the slide groove 10 d and then the convex portion 112. Can be fixed to the movable holder 110 and the base 121 can be passed through the through-hole 10c. Moreover, the cover part 122, the base part 121, and the protrusion part 23 have made comparatively simple shapes, respectively, and can manufacture these easily.

  In the present embodiment, the first seal groove 10b and the second seal groove 10e for disposing the first seal member and the second seal member (not shown) are formed in the movable holder 10, respectively. However, the present invention is not limited to this. For example, the first seal groove for arranging the first seal member may be formed in the fixed holder, and the second seal groove for arranging the second seal member is formed on the lid portion of the core holder. You may form in. Further, the shapes of the fixed holder, the movable holder, and the core holder are not limited to the shapes of the present embodiment.

  The die casting method of the present invention is extremely useful in the field of vacuum die casting.

1 is a schematic perspective view showing a fixed holder, a core holder, and a movable holder of a vacuum die casting mold according to an embodiment of the present invention. The schematic perspective view which shows the modification of the movable holder of the metal mold | die for vacuum die casting by embodiment of this invention. The schematic perspective view which shows the modification of the core holder of the metal mold | die for vacuum die casting by embodiment of this invention.

Explanation of symbols

10, 110 Movable holder 10b First seal groove 10c Through hole 10d Slide groove 10e Second seal groove 11A Fixed holder facing surface 12, 112 Convex portion 20, 120 Core holder 21, 121 Base 21A Upper surface 22, 122 Lid 22A End face 23 Protruding part 30 Fixed holder 30a Recessed part 30b Fixed die accommodating part 30c Protruding part engaging recessed part 31A Movable holder facing surface

Claims (3)

A fixed mold comprising a fixed holder and a fixed die;
A movable mold that is movable relative to the fixed mold and includes a movable holder and a movable die;
The slide has a core holder and a core die that can be advanced and retracted in a direction crossing the movable reciprocating direction, and a cavity is defined by the fixed die, the movable die, and the core die. In the die for vacuum die casting,
The movable holder has a fixed holder facing surface and a convex portion projecting from the fixed holder facing surface in the forward direction of the movable mold, and the convex portion is provided as a part of the movable holder . through hole penetrating the moving direction of the slide core is formed in a portion, a slide groove extending from one end opening of the through hole in the advancement direction of the slide core is formed on the fixing frame facing surface, The other end of the through hole in the retracting direction of the slide core opens at the outer surface of the movable holder,
The fixed holder has a movable holder facing surface that abuts against the fixed holder facing surface of the movable holder when the cavity is defined, and the movable holder facing surface has a protrusion engaging recess and the movable holder when the cavity is defined. A concave portion with which the convex portion can be engaged is formed,
The core holder is accommodated in the through hole and the slide groove, and is flush with the fixed holder facing surface and is opposed to the movable holder facing surface when housed in the through hole and the slide groove. A base having a base surface; a protrusion protruding from the base surface in the forward direction of the movable mold and engaging the protrusion engaging recess when the cavity is defined; and an end of the base in the retracting direction of the slide core And a flange-shaped lid portion having a flat surface that contacts the periphery of the other end opening of the through-hole in the retracting direction of the slide core when the cavity is defined, and the base portion is on the lid portion side. And can be divided into a portion on the protruding portion side,
A first seal member is provided between the movable holder facing surface and the fixed holder facing surface so as to surround the cavity, and between the convex portion and the portion of the fixed holder that defines the concave portion,
A die for vacuum die casting, wherein a second seal member is provided between the movable holder and the lid so as to surround the other end opening of the through hole in the retreat direction of the slide core . A fixed mold comprising a fixed holder and a fixed die;
A movable mold that is movable relative to the fixed mold and includes a movable holder and a movable die;
The slide has a core holder and a core die that can be advanced and retracted in a direction crossing the movable reciprocating direction, and a cavity is defined by the fixed die, the movable die, and the core die. In the die for vacuum die casting,
The movable holder has a fixed holder facing surface and a convex portion projecting from the fixed holder facing surface in the forward direction of the movable mold, and the movable holder has a through-hole penetrating in the forward and backward direction of the slide core. A slide groove extending from one end opening of the through hole in the forward direction of the slide core is formed on the surface facing the fixed holder, and the other end of the through hole in the backward direction of the slide core is An opening is formed on the outer surface of the movable holder, and the convex portion is detachable with respect to the surface facing the fixed holder, and covers the portion of the slide groove near the outer surface of the movable holder so as to cover the surface facing the fixed holder. Connected to form the through hole,
The fixed holder has a movable holder facing surface that abuts against the fixed holder facing surface of the movable holder when the cavity is defined, and the movable holder facing surface has a protrusion engaging recess and the movable holder when the cavity is defined. A concave portion with which the convex portion can be engaged is formed,
The core holder is accommodated in the through hole and the slide groove, and is flush with the fixed holder facing surface and is opposed to the movable holder facing surface when housed in the through hole and the slide groove. A base having a base surface; a protrusion protruding from the base surface in the forward direction of the movable mold and engaging the protrusion engaging recess when the cavity is defined; and an end of the base in the retracting direction of the slide core Provided with a flange-shaped lid portion having a flat surface that comes into contact with the periphery of the other end opening of the through hole in the retracting direction of the slide core when the cavity is defined,
A first seal member is provided between the movable holder facing surface and the fixed holder facing surface so as to surround the cavity, and between the convex portion and the portion of the fixed holder that defines the concave portion,
A die for vacuum die casting, wherein a second seal member is provided between the movable holder and the lid so as to surround the other end opening of the through hole in the retreat direction of the slide core . A vacuum die casting method comprising performing vacuum die casting using the vacuum die casting mold according to claim 1 .

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