JP2009226455A - Molding die, and method for molding molded product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding die and a method for molding a molded product, wherein the molding die and the molded product are prevented from being broken due to the shrinkage, with respect to the molding die where an insert such as a core pin is moved to a direction crossing the shrinkage direction of the molded product. <P>SOLUTION: The molding die comprises: a fixed die 1 and a movable die 2 arranged openably/closably so as to be confronted each other and forming a cavity 10 with a shape in accordance with the molded product at the inside; a core insert 3 which projects to the inside of the cavity 10 and is provided so as to move forward relatively to the axial direction to the movable die 2 on and after the opening of the fixed die 1 and the movable die 2; and an insert positioning-moving mechanism 5 positioning the core insert 3 to the movable die 2 when the fixed die 1 and the movable die 2 are closed and allowing the moving of the core insert 3 to the shrinkage S direction of the molded part P on and after the die opening. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a molding die and a molding method of a molded product.

  As a molding die, for example, in a casting die, as disclosed in Patent Document 1, a casting die with an operation mechanism for operating an insert such as a core pin or a moving core is known. . In Patent Document 1, a moving core that can be moved forward and backward into a cavity is attached to a mold body (hereinafter simply referred to as a mold), and a cast pin is formed in the cavity and pulled out from a molded product by a cylinder. Etc. are described.

JP-A-5-92237

  By the way, in such a conventional mold, as shown by the arrow S shown in FIG. 2B and FIG. 5B, the molding is completed and the mold is opened. When the molded product (P) is released from the mold (2), the solidified molded product (P) contracts. At this time, if the cast insert (3) is arranged in a direction crossing the shrinkage S direction of the molded product (P), the cast insert (3) is caused by the shrinkage S of the molded product (P). Is pressed against the hole of the mold (2) supporting this, and friction is caused, so that the cast insert (3), the hole of the mold (2) supporting this, the cast of the molded product (P) There was a problem that the hole (Ph) was broken.

  The present invention has been made in view of the above-described problems, and in a molding die in which an insert such as a core pin is moved in a direction crossing the shrinking direction of the molded product, the molding die or the molded product is damaged due to the shrinkage. It is an object of the present invention to provide a molding die and a molding method for a molded product that can prevent the above.

In order to achieve the above object, the invention according to the first aspect of the present invention provides a first and second cavity in which a cavity having a shape corresponding to a molded product is formed in a closed state so as to be opened and closed opposite to each other. A mold projecting into the cavity, and a nesting provided to move forward relative to one mold after the mold opening of the first and second molds, and the first and second molds When the second mold is closed, the insert is positioned with respect to the one mold, and the insert moves in the contraction direction of the molded product after the first and second molds are opened. And a nesting positioning-moving mechanism that permits the above.
Further, in order to achieve the above object, the invention according to the molding method of the molded product of claim 2 has a predetermined shape by the cavity formed so that the first and second molds are closed and the insert protrudes inside. The molded product is molded, the first and second molds are opened, the molded product is released from one mold, and the insert that is in close contact with the molded product is axially relative to the one mold. And moving the insert in the contraction direction of the molded product.

According to the first aspect of the present invention, when the first and second molds are closed, the nest is positioned with respect to the one mold, and the molds are opened after the first and second molds are opened. Equipped with a nest positioning-moving mechanism that allows the nest to move in the shrinking direction of the molded product, so that the nest is positioned at a predetermined position in the cavity during molding so that the molded product with a predetermined shape can be accurately It can be molded well, and after the mold is opened, it allows the nest to move in the shrinking direction of the molded product, preventing the molded product and the molded product itself from being damaged by the shrinkage of the molded product. A mold that can be provided can be provided.
According to the second aspect of the present invention, the molded product is opened by opening the first and second molds and released from one of the molds. Advancing and moving relative to the mold in the axial direction, and allowing the nest to move in the shrinking direction of the molded product prevents the molded product and the molded product itself from being damaged by the shrinkage of the molded product. It is possible to provide a molding method of a molded product that can be performed.

(Aspect of the Invention)
In the following, the invention that is claimed to be claimable in the present application (hereinafter referred to as “claimable invention”. The claimable invention is at least the “present invention” to the invention described in the claims. Some aspects of the present invention, including subordinate concept inventions of the present invention, superordinate concepts of the present invention, or inventions of different concepts) will be illustrated and described. As with the claims, each aspect is divided into sections, each section is numbered, and is described in a form that cites the numbers of other sections as necessary. This is for the purpose of facilitating the understanding of the claimable invention, and is not intended to limit the combinations of the constituent elements constituting the claimable invention to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiments, etc., and as long as the interpretation is followed, another aspect is added to the form of each section. In addition, an aspect in which constituent elements are deleted from the aspect of each item can be an aspect of the claimable invention. In each of the following items, item (1) corresponds to claim 1 and item (5) corresponds to claim 2.

(1) First and second molds that are arranged so as to be openable and closable opposite to each other and in which a cavity having a shape corresponding to a molded product is formed inside;
A nest that protrudes into the cavity and is provided to move forward in the axial direction relative to one mold after the mold opening of the first and second molds;
The insert is positioned relative to the one mold when the first and second molds are closed, and the insert is inserted in the contraction direction of the molded product after the mold opening of the first and second molds. A mold having a nesting positioning-moving mechanism that allows movement of the mold.

  In the invention described in item (1), since the nest positioning / moving mechanism is provided, when the first mold and the second mold are closed and molded, the nest is inserted into one mold. By positioning, the molded product can be accurately molded, and after the first mold and the second mold are opened to take out the molded product, the released molded product contracts. Accordingly, it is possible to prevent the molded product itself and the mold from being damaged by contraction of the molded product.

  (2) The insert positioning / moving mechanism is tapered such that a through hole formed in one mold and a shaft portion of the insert inserted through the through hole gradually expand toward the other mold. The mold according to item (1), wherein the mold is formed into a shape.

  In the invention of the item (2), in the invention described in the item (1), a through hole formed in one of the first and second molds, and a shaft of a nest inserted into the through hole The part is formed in a tapered shape so that the diameter gradually increases toward the other mold, so that the insert positioning / moving mechanism can be easily configured. The tapered shaft part of the nesting is fitted into the tapered through hole, so that not only positioning in the direction perpendicular to the axial direction of the nesting but also the axial retreat limit of the nesting with respect to one mold is possible. Regulated and positioned. Then, after opening the first mold and the second mold to take out the molded product, the nest moves forward relative to the through hole of one mold, so that An insert having a tapered shaft portion is allowed to move with respect to the taper-shaped through-hole according to the shrinkage of the released molded product.

  (3) The nest positioning-moving mechanism has a size in which a through hole is formed in one mold with a predetermined size, and a shaft front portion of the nest inserted through the through hole is fitted into the through hole. Now, the rear part of the shaft part is formed in such a size as to be loosely fitted into the through-hole, and the position of the shaft part front of the nest that has moved in response to the shrinkage of the molded product is aligned with the through-hole. The mold according to item (1), further comprising a position returning mechanism for returning the position.

  In the invention of item (3), in the invention described in item (1), a through-hole having a predetermined size formed in one of the first and second molds is inserted during molding. By positioning the front part of the child shaft part, it is positioned in a state of protruding into the cavity. And since the shaft part rear of the insert is formed smaller than the through hole, the insert moves relatively forward after the first mold and the second mold are opened to take out the molded product. The rear part of the shaft part is loosely fitted into the through hole, and the nest is allowed to move in accordance with the contraction of the released molded product. After that, when the next molding cycle is performed, the position in front of the shaft portion of the nest moved in response to the contraction of the molded product is returned by the position return mechanism to be aligned with the through hole, and the nest is retracted with respect to the through hole. Then, the shaft portion front is fitted into the through hole.

  (4) The plurality of inserts are held in a state in which each base end portion is allowed to move in the shrinking direction of the molded product with the insert extrusion plate (1) to The molding die according to any one of (3).

  In the invention of the item (4), in the invention described in any one of the items (1) to (3), when a plurality of nesting elements are provided, the base end portions of the nesting elements are respectively By holding the insert extrusion plate in a state in which it is allowed to move in the shrinking direction of the molded product, it is prevented that the insert moves in the shrinking direction of the molded product with respect to the through hole. There is no.

(5) The first and second molds are closed, and a molded product having a predetermined shape is formed by a cavity formed so that the nest protrudes inside.
Opening the first and second molds to release the molded product from one of the molds, moving the nest in close contact with the molded product forward in the axial direction relative to the one mold, A molding method for a molded product, which allows the nest to move in a shrinking direction of the molded product.

  In the invention of (5), the first and second molds are closed, and a molded product having a predetermined shape is formed by the cavity formed so that the nest protrudes inside, and then the first and second molds are formed. When the mold is opened and the molded product is released from one mold, the nest that is in close contact with the molded product is moved forward in the axial direction relative to one mold, and the molded product is inserted in the shrinking direction of the molded product. By allowing the child to move, the molded product itself or the mold can be prevented from being damaged by contraction of the molded product.

(6) First and second molds that are arranged so as to be openable and closable opposite to each other and are closed to form a cavity having a shape corresponding to a molded product, and a nest protruding into the cavity. A method of molding a molded product of a predetermined shape with a mold,
The nest is positioned with respect to the one mold when the first and second molds are closed, and the shaft with respect to the one mold after the mold opening of the first and second molds. Provided to move forward in the direction and allow movement of the molded product in the shrinking direction,
Positioning the nesting relative to the one mold by closing the first and second molds;
Fill the melted material into the cavity and solidify it to form a molded product of a predetermined shape,
A molding method characterized by allowing the insert to move forward in the axial direction relative to the one mold after the mold is opened and allowing the molded article to move in the contraction direction.

  In the invention of item (6), prior to molding, the nest is positioned with respect to one mold when the first and second molds are closed, and after the mold opening of the first and second molds. The mold is provided so as to move forward relative to one mold in the axial direction and allow the molded article to move in the contraction direction. When molding, the insert is positioned in one of the first and second molds, and the mold is closed to form a cavity with a predetermined shape from which the insert protrudes, and the inside is filled with a molten material and solidified. Thus, a molded product having a predetermined shape is formed. Thereafter, the first and second molds are opened to release the molded product from one mold, and the insert is moved forward relative to the one mold simultaneously with or after the mold release. . At this time, the insert is allowed to move in the contraction direction of the molded product. Therefore, damage to the molded product itself or the mold can be prevented by contraction of the molded product.

First, a first embodiment of a molding die according to the present invention will be described in detail mainly with reference to FIG. 1 in the case of a casting mold for molding a molded product P having a cast hole Ph. . The same reference numerals indicate similar or corresponding parts.
The mold according to the present invention is roughly a fixed mold 1 as a first mold in which a cavity 10 having a shape corresponding to the molded product P is formed inside in a closed state arranged opposite to each other so as to be opened and closed, and A movable mold 2 as a second mold and a protrusion projecting into the cavity 10 are provided so as to move forward relative to one mold 1 or 2 in the axial direction after the fixed mold 1 and the movable mold 2 are opened. When the mold insert (hereinafter referred to as cast insert) 3 and the fixed mold 1 and the movable mold 2 are closed, the cast insert 3 is positioned with respect to one mold 1 or 2, and the fixed mold 1 And an insert positioning / moving mechanism 5 that allows the cast insert 3 to move in the shrinking S direction of the molded product P after the mold 2 is opened. The insert positioning / moving mechanism 5 according to this embodiment includes a through hole 50 formed in one mold 1 or 2 and a shaft portion 31 of the core insert 3 inserted into the through hole 50. The taper shape is formed so as to gradually expand the diameter toward the other mold 2 or 1. Further, in this embodiment, a plurality of through holes 50, 50... Are formed in one mold 1 or 2, and the cast inserts 3 are respectively inserted into the respective through holes 50. A cast-in insert holder holding plate 40 for holding each base end portion 33 of the child 3 is provided, and each base end portion 33 of the cast-in insert 3 with respect to the shot insert insert holding plate 40 is a molded product P. It is held in a state where it is allowed to move in the contraction S direction.

  The fixed mold 1 is attached to a fixed plate of a casting machine, and connected to hot water supply means such as a plunger device for injecting and filling molten metal (molten metal) into the cavity 10. The movable mold 2 is attached to a movable plate connected to a mold clamping device of a casting machine. The opposing surfaces of the fixed mold 1 and the movable mold 2 are carved according to the shape of the molded product P to be molded. In this embodiment, as shown in FIG. 3, a plurality of concave portions 2a are formed corresponding to the plurality of convex portions Pa formed on the molded product P by engraving the movable mold 2. A cast insert 3 for forming a cast hole Ph in each convex portion Pa of the product P is inserted into a through hole 50 formed so as to open to each concave portion 2a.

  On the back surface of the movable mold 2 (left side in FIG. 1), a cast insert holding plate 40 and a molded product extrusion plate 60 are arranged. The movable die 2 includes a cast insert return pin 42 connected to the cast insert holding plate 40, a molded product push pin 61 and a molded product push plate return pin 62 connected to the molded product push plate 60. Each hole is formed so as to penetrate therethrough. In the case of this embodiment, the cast-in insert 3 is arranged so that its axis is parallel to the opening / closing direction of the movable mold 2 relative to the fixed mold 1.

  As shown in FIG. 1, the through hole 50 of the movable mold 2 is tapered so that the diameter gradually increases from the rear to the front (from left to right in FIG. 1), that is, toward the fixed mold 1. Is formed. On the other hand, the tip portion 30 projecting into the cavity 10 of the cast insert 3 has a shape corresponding to the cast hole Ph formed in the molded product P and is formed with a predetermined draft. Further, on the rear side of the tip portion 30 of the core 3, a taper shape is formed so that the diameter gradually increases from the rear toward the front, corresponding to the tapered through hole 50 of the movable die 2. It has the taper-shaped part 31 formed in this. Further, an engaging portion 33 that is engaged with a cover member 41 described later is provided as a base end portion at the rear end (base end) of the shaft portion 32 of the core 3.

  A cover member 41 that houses and holds the engaging portion 32 at the base end of the cored insert 3 is attached to the front surface of the cored insert holding plate 40 facing the movable die 2. The cover member 41 is formed with a slit or hole (hereinafter simply referred to as a slit) 43 through which the shaft portion 32 of the core 3 is inserted. As will be described later, the housing portion of the cover member 41 is arranged so that the cast insert 3 can move in a direction intersecting the axial direction with the shrinkage S of the molded product P after the mold opening. It is sufficiently larger than the engaging portion 33, and the size of the slit 43 of the cover member 41 is also larger than the shaft portion 32 of the cored insert 3. The movable die 2 includes a cast insert return pin 42 provided on the cast insert holding plate 40, a molded product push pin 61 and a molded product push plate return pin 62 connected to the molded product push plate 60. Each hole is formed so as to penetrate therethrough. The holes through which the cast insert return pin 42 and the molded product extrusion plate return pin 62 of the movable mold 2 are inserted are the peripheral edges of the fixed die 1 at the tips of the cast insert return pin 42 and the molded product extrusion plate return pin 62, respectively. It is arrange | positioned so that it may contact | abut. The hole through which the molded product push-out pin 61 of the movable mold 2 is inserted is disposed so as to correspond to a predetermined position of the molded product P. In a state where the molded product extrusion plate 60 is retracted relative to the movable mold 2, that is, in a state where the molded product extrusion plate return pin 62 is in contact with the peripheral edge of the fixed mold 1, the molded product extrusion pin 61 is The surface is set so as to partially form the surface of the cavity 10.

Next, the first embodiment of the molding method of the molded product P according to the present invention will be described in detail with reference to FIGS. 1 to 3 together with the operation depending on the case where the molding die configured as described above is used. .
The molded product of the present invention is generally molded in such a manner that the fixed mold 1 as the first mold and the movable mold 2 as the second mold are closed to form the punched hole Ph in the molded product P. A cavity 10 is formed so that the insertion / removal element 3 protrudes, and a molded product P having a predetermined shape is formed by filling the cavity 10 with a material of a molten molded product P such as molten metal. 1 and the movable mold 2 are opened, the molded product P is released from one of the molds 1 or 2, and the cast insert 3 in a state of being in close contact with the cast hole Ph of the molded product P While moving forward relative to the mold 1 or 2 in the axial direction, the cast insert 3 is allowed to move in the shrinking S direction of the molded product P.

  Prior to molding the molded product P, first, as described above, the stationary mold 1 is formed so that the cavity 10 having a shape corresponding to the molded product P is formed inside in a closed state that is disposed so as to be openable and closable. And the movable die 2, the cast insert 3 protruding into the cavity 10, and the fixed insert 1 and the movable die 2 are closed when the cast insert 3 is positioned with respect to one die 1 or 2, After the opening of the fixed mold 1 and the movable mold 2, the core 3 is moved forward relative to the mold 1 or 2 in the axial direction and allowed to move in the contraction S direction of the molded product P. A forming die provided with a nested positioning and moving mechanism 5 is prepared. In the embodiment described above, the cored insert 3 is arranged with respect to the movable mold 2 such that its axis is parallel to the mold opening / closing direction, and is configured to move forward and backward in the axial direction. Yes. Further, when the molded product P is opened and released, the molded product P tends to shrink mainly in the direction toward the center (see arrow S in FIG. 3). Therefore, the core insert 3 is disposed in a direction intersecting the shrinkage S direction of the molded product P.

  When molding the molded product P, as shown in FIG. 1, when the fixed mold 1 and the movable mold 2 are closed, the cast insert return pin 42 and the molded product extrusion plate return pin with respect to the peripheral edge of the fixed mold 1. The cast insert 3 held by the cast insert holding plate 40 and the molded product push pin 61 held by the molded product push plate 60 are moved backward relative to the movable die 2. It becomes a state. At this time, the taper portion 31 of the cast insert 3 retracts from the through hole 50 formed in the taper shape of the movable die 2 constituting the insert positioning / moving mechanism 5. Thus, the tip 30 of the cast insert 3 is accurately and reliably positioned and protrudes into the cavity 10. Further, the tip end surface of the molded product extrusion pin 61 partially forms the surface of the cavity 10. In this state, as shown in FIG. 2 (a), the material melted by the hot water supply means is filled into the cavity 10 and solidified to form a molded product P having a predetermined shape. At this time, the molded product P tends to shrink by solidifying, but cannot be shrunk because it is held in the cavity 10 with the mold closed.

  When the material filled in the cavity 10 is solidified and the molded product P is molded, the movable mold 2 is moved backward by the mold clamping device so as to be separated from the fixed mold 1 as shown in FIG. Open the mold. At this time, the molded product P is held by the fixed mold 1 and is released from the movable mold 2. Then, the molded product P held in the cavity 10 is released by opening and releasing the mold, and in this embodiment, as shown by an arrow S, the molded product P contracts toward the center of the molded product P. It becomes. Further, the core 3 is in close contact with the core hole Ph formed in the convex portion Pa of the molded product P. Therefore, in this state, the cast insert holder holding plate 40 does not move backward, and the movable mold 2 moves backward with respect to the cast insert 3 as shown by an arrow B in FIG. Therefore, the cast-in insert 3 moves forward relative to 2. Accordingly, the tapered portion 31 of the cast insert 3 is pulled out from the through hole 50 of the movable die 2, and in this embodiment, in the direction substantially orthogonal to the axis of the cast insert 3 with the shrinkage S of the molded product P. Movement (arrow T in FIG. 3) is allowed. Further, the engaging portion 33 formed at the base end portion of the core insert 3 moves in the same manner within the housing portion of the cover member 41 attached to the core insert holding plate 40, and the engagement portion 3 is engaged. The shaft portion 32 in the vicinity of the joint portion 33 can similarly move within the slit 43.

  Further, when the movable mold 2 is moved backward, as shown in FIG. 2 (c), the cast-in insert holder holding plate 40 is moved back together by being brought into contact with the movable mold 2 to be cast-in. The child 3 is extracted from the cast hole Ph of the molded product P. Thereafter, the molded product P is removed from the fixed mold 1 and one molding cycle is completed.

Next, a second embodiment of the mold according to the present invention will be described in detail with reference to FIG. In this embodiment, parts that are the same as or correspond to those in the first embodiment described above are denoted by the same reference numerals, description thereof is omitted, and only different configurations are described.
The molding die in this embodiment is roughly the insertion positioning / moving mechanism 5 in which the through hole 51 is formed in one die 1 or 2 with a predetermined size, and the cast-in / insertion through which the through hole 51 is inserted. The shaft portion front 35 of the child 3 is sized to be fitted into the through hole 51, and the shaft portion rear portion 36 is formed to be loosely fitted into the through hole 51, and further accommodates contraction of the molded product P. A position returning mechanism 70 is provided for returning the position of the shaft front part 35 of the cast-in insert 3 in a moved state to align with the through hole 51 in the mold opening / closing direction.

  As shown in FIG. 4, the through-hole 51 of the movable mold 2 has a predetermined size and is formed in a straight shape having a uniform size from the rear to the front. On the other hand, a portion 35 (located forward in the shaft portion) 35 from the tip portion 30 of the cored insert 3 is continuous from the tip portion 30 over a length corresponding to the thickness of the movable die 2. The cross section is formed to be relatively large so as to be fitted into the straight through hole 51 formed in the movable mold 2 (hereinafter, this portion is referred to as a large diameter portion 35). Further, a portion of the cored insert 3 behind the large-diameter portion 35 has a relatively smaller cross section than the size of the through hole 51 of the movable die 2 (hereinafter, this portion is referred to as a small-diameter portion 36).

  As the position return mechanism 70 in this embodiment, relative advancement of the caster insert 3 with respect to the movable die 2 and the actuator 71 made of a cylinder or the like is restricted on the rear surface of the cast insert holder holding plate 40. A forward restricting member 44 is provided. A hole 45 larger than the cross section of the small diameter portion 36 is formed in the core holder 40 so that the small diameter portion 36 of the core 3 can move in a direction substantially perpendicular to the axis. . Further, the advance restricting member 44 is larger than the cross section of the small diameter portion 36 so that the small diameter portion 36 of the core 3 can move in a direction substantially orthogonal to the axis thereof, and the core 3 The hole 46 is formed in such a size that the engaging portion 33 is not pulled out. The actuator 71 is provided with a bush 72 at the tip of an operating rod that extends and retracts with respect to the main body, and the small diameter portion 36 of the cored insert 3 is slidably inserted into the bush 72. Yes.

  For example, an air cylinder or a hydraulic cylinder can be used as the actuator 71. In the embodiment shown in FIG. 4, when the operating rod of the actuator 71 is in the retreat limit position, the large-diameter portion 35 of the core 3 with the shaft portion held by the bush 72 passes through the movable die 2. It is arranged so as to align with the hole 51 and is driven so as to allow the core 3 to move in a direction substantially perpendicular to its axis as the molded product P contracts after the mold is opened as will be described later. It is controlled to a free state so as to expand. That is, in the position return mechanism 70 of the insert positioning / moving mechanism 5 in this embodiment, the bush 71 provided on the operating rod is inserted into the shaft portion of the core insert 3 and the actuator 71 moves and holds it. It is comprised by.

  Next, the second embodiment of the molding method of the molded product according to the present invention is shown in FIGS. 4 to 6 together with the operation thereof depending on the case of using the molding die in the second embodiment configured as described above. This will be described in detail. In addition, the same code | symbol is attached | subjected about the part which is the same as that of 1st Embodiment of the shaping | molding method method of the molded article P mentioned above, or it corresponds, and the description is abbreviate | omitted, and only a different part will be demonstrated.

  Prior to molding the molded product P, first, a molding die provided with the nesting positioning-moving mechanism 5 in the second embodiment configured as described above is prepared.

  When the molded product P is molded, as shown in FIG. 4, when the fixed mold 1 and the movable mold 2 are closed, the cast insert return pin 42 and the molded product extrusion plate return pin with respect to the peripheral edge of the fixed mold 1. 62 is brought into contact with each other, and the core insert holding plate 40 and the molded product pushing plate 60 are moved backward relative to the movable mold 2. At this time, the core 3 is positioned by the actuator 71 so as to be aligned with the through hole 51 of the movable mold 2. Therefore, as the cast-in insert holder holding plate 42 retreats, the cast-in insert 3 is moved backward relative to the movable mold 2, and the large-diameter portion 35 located in front of the shaft portion is movable. The tip portion 30 is fitted into the through hole 51 of the mold 2 and protrudes into the cavity 10. In this state, as shown in FIG. 5A, the material melted by the hot water supply means is filled in the cavity 10 and solidified to form a molded product P having a predetermined shape. At this time, the molded product P tends to shrink by solidifying, but cannot be shrunk because it is held in the cavity 10 with the mold closed.

  When the material filled in the cavity 10 is solidified and the molded product P is molded, as shown in FIG. 5 (b), the movable mold 2 is moved backward so as to be separated from the fixed mold 1 by a mold clamping device. Open the mold. At this time, the molded product P is held by the fixed mold 1 and is released from the movable mold 2. Then, the molded product P held in the cavity 10 is released by opening and releasing the mold, and in this embodiment, as shown by an arrow S in FIG. 6, toward the center of the molded product P. It will shrink. Further, the core 3 is in close contact with the core hole Ph formed in the convex portion Pa of the molded product P. Therefore, in this state, the cast insert holder holding plate 40 does not move backward, and the movable mold 2 moves backward with respect to the cast insert 3 as shown by an arrow B in FIG. Therefore, the cast-in insert 3 moves forward relative to 2. Therefore, the large-diameter portion 35 of the cast insert 3 is pulled out from the through hole 51 of the movable mold 2, and the small diameter portion 36 of the cast insert 3 has a gap in the through hole 51 of the movable mold 2, that is, It is inserted in a loosely fitted state. Therefore, movement (arrow T in FIG. 6) in a direction substantially orthogonal to the axis of the core 3 is allowed with the shrinkage S of the molded product P. Further, the small diameter portion 36 of the core insert 3 can move in the holes 45 and 46 of the core insert holding plate 40 and the advance restriction member 44, and the engaging portion 33 formed at the base end portion. This prevents the advance restricting member 44 from coming out of the hole 46.

  When the movable mold 2 is further moved backward, as shown in FIG. 5C, the cast insert holder holding plate 40 is moved back together by contacting the movable mold 2, and the cast insert is inserted. The child 3 is extracted from the cast hole Ph of the molded product P. Thereafter, the molded product P is removed from the fixed mold 1 and one molding cycle is completed.

  As shown in FIG. 7, the molding die in the second embodiment is provided with an actuator 71 on the back surface of the movable die 2, and without the advance restricting member 44 provided on the cast-in insert holding plate 40. A hole 45 may be formed in the insert holding plate 40 to directly engage the engaging portion 33 of the core insert 3.

Furthermore, the present invention is not limited to any one of the above-described embodiments, and the cored insert 3 can be provided so as to be movable forward relative to the fixed mold 1. In this case, the molded product P is held by the movable mold 2 and released from the fixed mold 1 when the mold is opened.
Further, the axial movement of the core 3 is not limited in parallel with the mold opening / closing direction, and the movement of the core 3 due to the shrinkage S of the molded product P It is not limited to the direction orthogonal to the 3 axis. In the present invention, the direction allowing the movement of the cast insert 3 may be the shrinkage S direction of the molded product P.
Furthermore, in the present invention, the present invention is not limited to the case where the punched hole Ph is formed, that is, the case where the insert 3 is a cast insert.
And this invention is not limited to casting of a metal etc., It can apply also to injection molding of resin etc.

It is sectional drawing which shows 1st Embodiment of the shaping | molding die of this invention. For explaining the state (a) in which the material is filled in the cavity of the mold shown in FIG. 1, the state (b) in which the mold is opened, and the state (c) in which the cast insert is extracted from the molded product. It is principal part sectional drawing shown in FIG. In 1st Embodiment, it is the partial expanded sectional view shown in order to demonstrate the state in which the molded article contracted by mold release and it was permitted that a casting insert moves with it. It is sectional drawing which shows 2nd Embodiment of the shaping | molding die of this invention. For explaining the state (a) in which the material is filled in the cavity of the mold shown in FIG. 4, the state (b) in which the mold is opened, and the state (c) in which the cast insert is extracted from the molded product. It is principal part sectional drawing shown in FIG. In 2nd Embodiment, it is the fragmentary expanded sectional view shown in order to demonstrate the state in which the molded article contracted by mold release and it was permitted that a cast-in insert moves with it. It is sectional drawing shown in order to demonstrate the modification of 2nd Embodiment of the shaping | molding die shown in FIG.

Explanation of symbols

P: molded product, Ph: cast hole, 1: fixed mold (first mold), 2: movable mold (second mold), 3: cast insert (nested), 5: insert positioning 50: Tapered through hole, 51: Straight through hole, S: Direction of shrinkage of the molded product, T: Direction of movement of the core insert as the molded product shrinks

Claims (2)

A first mold and a second mold which are arranged so as to be openable and closable in opposition to each other and form a cavity having a shape corresponding to a molded product in a closed state;
A nest that protrudes into the cavity and is provided to move forward in the axial direction relative to one mold after the mold opening of the first and second molds;
The insert is positioned relative to the one mold when the first and second molds are closed, and the insert is inserted in the contraction direction of the molded product after the mold opening of the first and second molds. A mold having a nesting positioning-moving mechanism that allows movement of the mold. The first and second molds are closed, and a molded product having a predetermined shape is formed by a cavity formed so that the nest protrudes inside,
Opening the first and second molds to release the molded product from one of the molds, moving the nest in close contact with the molded product forward in the axial direction relative to the one mold, A molding method for a molded product, which allows the nest to move in a shrinking direction of the molded product.

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