JP2015016479A - Mold release device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold release device capable of facilitating mold release of a molding product such as a casting product from a slide mold.SOLUTION: A mold release device 10 incorporated in a slide mold 12 includes a support board 22, and extrusion pins 26 supported by the support board 22 and inserted in insertion holes 28 of the slide mold 12. On the other hand, a guide member 32 is provided in the slide mold 12, and coil springs 44 are held between the support board 22 and the guide member 32. Since positions of the support board 22 and the extrusion pins 26 are maintained due to extension of the coil springs 44 when the slide mold 12 moves back, the extrusion pins 26 are projected from the slide mold 12. A casting product 52 being the molding product is pressed by the projected extrusion pins 26, and the mold release of the casting product 52 from the slide mold 12 is facilitated.

Description

  The present invention relates to a mold release device for releasing a molded product when a mold is opened.

  In the casting processing apparatus, an extrusion pin for releasing the cast product from the mold is provided. Here, the cast product has a product part made of molten metal solidified in the cavity and a design part made of molten metal solidified by a runner extending from the gate to the cavity, for example. Patent Document 1 proposes an extrusion mechanism including an extrusion pin that extrudes the design part in order to release the product part and the design part in a balanced manner.

  Generally, a casting processing apparatus includes a fixed mold that is positioned and fixed, a movable mold that approaches or separates from the fixed mold, and a sliding mold that forms a cavity together with the fixed mold and the movable mold. . The extrusion mechanism described in Patent Document 1 is provided in a fixed mold, and presses a cast product toward the movable mold side.

JP 2007-83273 A

  When the casting is a polyhedron, the mold release resistance of the casting varies depending on the surface. That is, the mold release resistance of one surface is large, and the mold release resistance of another surface is small.

  In such a case, it is desirable to arrange the extrusion pin so that a surface having a large release resistance can be extruded. For example, when the release resistance of the surface facing the sliding mold is large, it is preferable to provide an extrusion pin on the sliding mold.

  However, almost all surfaces facing the sliding cavity are molding surfaces. For example, the fixed mold and the movable mold have room for providing a return pin on the surface (mold matching surface) with which they abut each other, but the sliding mold does not have such a space.

  As described above, even if it is preferable to provide the extrusion pin on the sliding mold, it is actually difficult to do so.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a release device that can be provided compactly with respect to a sliding mold.

In order to achieve the above object, the present invention is a mold release apparatus that is provided in a sliding mold constituting a mold forming apparatus and releases a molded product when the mold is opened.
An extrusion pin for applying a pressing force to the molded product;
A support plate for supporting the extrusion pin;
A guide member that is provided in the sliding mold and guides the support plate that is displaced following the displacement of the sliding mold;
A resilient member that is sandwiched between the support plate and the guide member, and that urges and pushes the push pin toward the molded product;
A stopper for restricting displacement of the support plate when the sliding mold is displaced by a predetermined distance during mold clamping;
It is characterized by providing.

  In the sliding mold in which the mold release device configured as described above is incorporated, when the sliding mold is retracted when the mold is opened, the positions of the support plate and the extrusion pin are maintained by the elastic member. For this reason, an extrusion pin protrudes from the sliding type | mold which reverse | retreats. When the protruding extrusion pin presses the molded product, release of the molded product from the sliding mold is promoted.

  In addition, the mold release device can be configured simply and compactly by floatingly supporting the support plate in a sliding manner via the guide member and the resilient member. That is, according to the present invention, it is possible to easily release the molded product while reducing the size of the release device.

  The stopper may be constituted by, for example, a side key provided on a fixed mold or a movable mold into which the sliding mold enters during mold clamping. In this case, since an existing member can function as a stopper, it is not necessary to newly provide a stopper. For this reason, a mold release apparatus can be comprised more simply.

  As a suitable example of the mold forming apparatus incorporating the mold release device, a casting processing device having a large mold release resistance of a molded product (cast product) can be cited, but the mold release device has a mold release resistance. Even a small mold forming apparatus can be applied. That is, for example, an injection molding device or a forging device may be used.

  According to the present invention, when the sliding mold moves backward during the mold opening, the positions of the support plate and the extrusion pin are maintained by the elastic member. That is, the sliding mold is retracted in a state where the push pin is not displaced. As a result, the extruding pin protrudes from the retreating sliding mold, and the protruding extruding pin presses the molded product. This pressing promotes release of the molded product from the sliding mold.

  In addition, the mold release device can be made compact by a simple configuration in which the support plate is floatingly supported in a sliding manner via the guide member and the elastic member.

It is a schematic longitudinal cross-sectional view of the sliding type in which the mold release apparatus which concerns on this Embodiment was integrated. FIG. 2 is a schematic longitudinal sectional view showing a state in which the sliding mold and the support plate constituting the release device are displaced in the mold clamping direction (arrow X1 direction) following FIG. 1. FIG. 3 is a schematic longitudinal sectional view showing a state in which the support board is dammed by a side key (stopper) and the sliding mold has reached the forward end, following FIG. 2. It is a schematic longitudinal cross-sectional view which shows the state by which the casting (molded product) was pressed with the extrusion pin which comprises the said mold release apparatus in the middle of mold opening from FIG. It is a schematic longitudinal cross-sectional view which shows the state which mold opening advanced and the said extrusion pin was spaced apart from the cast product.

  Hereinafter, preferred embodiments of a release apparatus according to the present invention will be described and described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic longitudinal sectional view of a sliding mold 12 in which a release device 10 according to the present embodiment is incorporated. The sliding mold 12 forms a cavity 16 together with a movable mold 14 and a fixed mold (not shown) constituting a mold forming apparatus (not shown).

  A rod 20 of a hydraulic cylinder 18 is connected to the sliding mold 12. As the hydraulic cylinder 18 is energized and the rod 20 moves forward in the direction of the arrow X1 in FIG. 1, the mold is clamped. On the other hand, when performing mold opening, the rod 20 moves backward in the direction of the arrow X2 in FIG.

  The mold release device 10 has a support plate 22 provided on the mold opening side (back side) of the sliding mold 12. A notch for passing the rod 20 is formed in a substantially central portion of the support board 22.

  An extrusion pin 26 is press-fitted into the bottomed press-fitting hole 24 formed in the support plate 22. In other words, the extrusion pin 26 is supported by the support board 22 by being press-fitted into the press-fitting hole 24. For example, three extrusion pins 26 are provided so as to be at the apex positions of equilateral triangles. FIG. 1 shows two of them.

  The push-out pin 26 is passed through an insertion hole 28 formed through the sliding mold 12 and protrudes from the front end surface of the sliding mold 12 toward the cavity 16 in the middle of the clamping.

  A screw hole 30 is formed on the back side of the sliding mold 12, and a screw portion 36 protruding from the tip of the spacer portion 34 of the guide member 32 is screwed into the screw hole 30. By this screwing, the guide member 32 is provided on the back side of the sliding mold 12.

  The longitudinal dimension of the spacer portion 34 corresponds to the separation distance between the sliding mold 12 and the support board 22. Therefore, the distance between the sliding mold 12 and the support board 22 can be variously changed by replacing the spacer portion 34 with one having a different longitudinal dimension. Thereby, it is possible to change the protrusion length of the extrusion pin 26.

  A guide rod portion 38 having a smaller diameter than that of the spacer portion 34 is connected to the spacer portion 34. The guide rod portion 38 is passed through an insertion hole 40 formed in the support plate 22 and protrudes to the back side of the support plate 22.

  A head 42 having a diameter larger than that of the guide rod 38 is provided at the tip of the guide rod 38. The guide rod portion 38 is passed through the hollow portion of the coil spring 44 (elastic member), and one end portion of the coil spring 44 is seated on the head portion 42. The other end is seated on the support board 22. The support plate 22 is elastically biased toward the movable mold 14 by the coil spring 44.

  Two side keys 46 are provided on the movable die 14 into which the sliding die 12 enters. As will be described later, the side key 46 functions as a stopper that prevents the support board 22 from being further advanced.

  The mold release apparatus 10 according to the present embodiment is basically configured as described above. Next, the function and effect will be described.

  When performing mold clamping, for example, the movable mold 14 is brought close to the fixed mold, and the mold matching surfaces are brought into contact with each other. Next, the hydraulic cylinder 18 is energized to advance the rod 20 in the direction of the arrow X1 (clamping direction) in FIG. 1, and thereby the sliding die 12 is advanced.

  As described above, the guide member 32 is provided on the back side of the sliding mold 12 by screwing the screw portion 36 into the screw hole 30. Accordingly, the guide member 32 is displaced following the sliding mold 12.

  Here, the coil spring 44 through which the guide rod portion 38 of the guide member 32 is passed is sandwiched between the head portion 42 of the guide member 32 and the support plate 22. For this reason, when the guide member 32 is displaced, the coil spring 44 is also displaced. As a result, the support plate 22 is pressed by the coil spring 44 and displaced while being guided by the guide member 32. That is, the support plate 22 is displaced following the sliding mold 12.

  When the sliding mold 12 is displaced by a predetermined distance, the support board 22 comes into contact with the side key 46 as shown in FIG. The support board 22 is blocked by this contact, and further advancement (displacement) of the support board 22 is further prevented.

  On the other hand, the forward movement of the rod 20 is continued. For this reason, the sliding mold 12 and the guide member 32 are further displaced. At this time, the guide rod portion 38 slides in the insertion hole 40 and the coil spring 44 is compressed by the head portion 42 that moves forward. Further, the push pin 26 slides in the insertion hole 28.

  Finally, as shown in FIG. 3, the sliding mold 12 is positioned at the forward end, thereby forming the cavity 16. At this time, the front end surface of the push pin 26 is substantially flush with the molding surface of the sliding die 12.

  Next, the molten metal 50 is introduced into the cavity 16 to perform casting. When the molten metal 50 is cooled and solidified while the mold clamping is maintained, a cast product 52 as a molded product is obtained. The casting 52 has a molded part having a shape corresponding to the shape of the cavity 16. In the present embodiment, the mold release resistance of the cast product 52 is larger on the surface facing the molding surface of the sliding mold 12 than on the surface facing the molding surface of the movable die 14.

  Next, mold opening is performed to take out the cast product 52. That is, in order to displace the sliding mold 12 in the arrow X2 direction (mold opening direction), the rod 20 moves backward in the arrow X2 direction under the action of the hydraulic cylinder 18. During the retreat, the coil spring 44 is extended, so that the state in which the support board 22 is in contact with the side key 46 is maintained. For this reason, the push pin 26 is not displaced. That is, only the sliding die 12 is retracted relative to the push pin 26, and as a result, the tip of the push pin 26 protrudes from the molding surface of the slide die 12 as shown in FIG. The protruding end of the extrusion pin 26 presses the cast product 52.

  When the mold release resistance of the surface facing the sliding mold 12 is larger than the surface facing the molding surface of the movable mold 14, the casting 52 adheres to the sliding mold 12 when the push pin 26 is not present. May follow displacement. Even in such a case where the mold release resistance is large, the extrusion pin 26 protrudes from the molding surface of the sliding mold 12, so that the casting 52 can be easily removed from the sliding mold 12 as shown in FIGS. Can be released.

  Thus, according to the mold release apparatus 10 according to the present embodiment, even the casting 52 having a large mold release resistance on the surface facing the molding surface of the slide mold 12 is released from the slide mold 12. Is easy. Moreover, the mold release device 10 is compact enough to be provided on the sliding mold 12. That is, it is possible to easily release the cast product 52 while reducing the size.

  The support plate 22 abuts on the spacer portion 34 by the extended coil spring 44. Thereafter, as shown in FIG. 5, the support plate 22 moves backward integrally with the mold opening operation of the sliding mold 12. Following this, the push pin 26 moves backward relative to the sliding die 12.

  The present invention is not particularly limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

  For example, the mold molding apparatus may be an injection molding apparatus that obtains a resin molded product from a molten resin. Alternatively, a forging device may be used.

  Further, in this embodiment, the case where the release device 10 is provided on the sliding die 12 entering the movable die 14 is illustrated, but the release device 10 is provided on the sliding die entering the fixed die. Of course, it may be.

DESCRIPTION OF SYMBOLS 10 ... Mold release apparatus 12 ... Sliding mold 14 ... Movable type 16 ... Cavity 18 ... Hydraulic cylinder 20 ... Rod 22 ... Supporting board 26 ... Extrusion pin 32 ... Guide member 34 ... Spacer part 38 ... Guide rod part 42 ... Head 44 ... coil spring 46 ... side key 50 ... molten metal 52 ... cast product

Claims (3)

A mold release device that is provided in a sliding mold that constitutes a mold forming apparatus and releases a molded product when the mold is opened,
An extrusion pin for applying a pressing force to the molded product;
A support plate for supporting the extrusion pin;
A guide member that is provided in the sliding mold and guides the support plate that is displaced following the displacement of the sliding mold;
A resilient member that is sandwiched between the support plate and the guide member, and that urges and pushes the push pin toward the molded product;
A stopper for restricting displacement of the support plate when the sliding mold is displaced by a predetermined distance during mold clamping;
A mold release apparatus comprising:   2. The mold release apparatus according to claim 1, wherein the stopper is a side key provided on a fixed mold or a movable mold into which the sliding mold enters during mold clamping.   3. The mold release apparatus according to claim 1, wherein the mold release apparatus is provided in a casting apparatus to release a cast product.

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