JP2011042148A - Molding mold device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin molding mold device constructed in such a manner that an upright dowel piece does not rotate to a fixed side mold, even when the upright dowel piece circularly engages with a connection shaft sliding hole. <P>SOLUTION: In order to transmit a push-up motion of an ejector plate 6 to an upright dowel piece 7, the connection shaft 8 having one end connected to the upright dowel piece 7 and another end connected to the ejector plate 6 slidably engages with a connection shaft sliding hole 10 formed on the fixed side mold 1. A pair of guide rods 9 and 9 are protrusively mounted parallel to the connection shaft 8 on the upright dowel piece 7, and a guide lock sliding hole 11 through which the guide rods 9 and 9 slidably move in accordance with the push-up motion of the upright dowel piece 7 is formed on the fixed side mold 1. Even when a rotation force is given to the upright dowel piece 7, both the guide rods 9 and 9 contact and prop up the hole walls of the guide lock sliding holes 11 and 11 to absorb the rotation force and prevent the rotation of the upright dowel piece 7 to the fixed side mold 7. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a molding die apparatus for molding a resin molded product such as an automobile door trim.

  In order to mold a resin molded product such as a door trim of an automobile, an injection molding method or a molding method that is excellent in mass productivity and moldability is usually used frequently.

  In such an injection molding method or a molding method, etc., all use a molding die apparatus constituted by a fixed side mold and a moving side mold, and the moving side mold is moved with respect to the fixed side mold. Then, a cavity having a predetermined shape is formed between both molds, and a resin molded product is molded by introducing molten resin into the cavity.

  After molding the resin molded product, it is necessary to take out the molded resin molded product by releasing the moving mold from the fixed mold. Since it is fitted on the mold side, the fixed side mold side is usually equipped with an ejector plate, and the ejector plate causes the moving side mold to release the fixed side mold side. By attaching the resin molded product fitted into the mold to the moving side mold side, the resin molded product can be taken out from the fixed side mold.

  In view of this point, conventionally, for example, an ejection mechanism shown in FIG. 7 has been provided in a stationary mold (see Patent Document 1).

Japanese Patent Laid-Open No. 10-16014 (refer to ejector plate 6, guide pin 11, straight-up core 12, etc.)

  7 and FIG. 8, the eject mechanism in the conventional resin mold apparatus has one end connected to a fixed mold a and an ejector plate (not shown) via a connecting shaft (guide pin) d and the other end. The provided straight-up piece piece (straight-up core) c is pushed up toward the moving mold b, and the resin molded product fitted in the fixed mold a is released from the moving mold b. Along with this, the moving side mold b is pushed up and taken out.

  In order to ensure that the resin molded product is pushed up, the straight-up piece piece c is formed such that, for example, both the upper and lower pieces (in the front and back direction in the drawing) are longer than the left and right pieces in plan view in FIG. In order to accommodate such a shape, the fixed-side mold a is formed so that the piece piece storage portion f fits the shape of the straight piece piece c in order to house the straight piece piece c when the mold is opened. The straight-up piece piece c stored in the piece piece storage portion f is flush with the molding surface g of the fixed mold a.

  According to the conventional resin mold apparatus having such a configuration, the connection shaft d that connects the ejector plate and the straight-up piece c is broken due to some factors while the molding operation of the resin molded product is repeated. If the breakage point e is formed in this way, the connecting shaft d is ejected from the breakage point e even if the ejector plate is returned to the original position after taking out the resin molded product. Just by pulling the plate side back to the ejector plate and returning, the connecting shaft d on the straight-up piece piece c side from the breakage point e causes breakage X, and the straight-up piece piece c remains in the pushed-up state. It will not be stored in the piece piece storage part f.

  Then, the connecting shaft d is formed in a round bar and is fitted into a circular shaft fitting hole having a circular cross section on the fixed mold a side. Is configured to slide.

  For this reason, when the moving side mold b is moved to the fixed side mold a side to mold the next resin molded product and the mold is clamped to form the cavity, the straight-up piece c Will not be stored in the piece storage section f, but will be displaced and will remain in the raised state, and will collide with the moving side mold b.

  At this time, it is only necessary for the moving side mold b to exert a collision force in the axial direction with respect to the straight-up piece piece c. However, if the impact force is exerted on the straight-up piece piece c from the eccentric direction. In this case, as shown in FIG. 8, the rotational force j is generated in the connecting shaft sliding hole h in the connecting shaft d, and the straight-up piece c is vertically moved in the horizontal direction as shown in FIG. It will rotate in the direction that the direction is switched.

  As a result, when the movable mold b is moved to the fixed mold a side to mold the next resin molded product, the mold is not stored in the piece storage section f. The moving mold b that has moved collides with the raising piece c, and by the impact force of the moving mold b, the straight raising piece c forcibly moves and collides with the fixed mold a side. As a result, the molding surface g of the fixed mold a, the molding surface k of the movable mold b, or the straight-up piece c is severely damaged, and the connecting shaft d is slid by the connecting shaft d along with the damage of the connecting shaft d. This will cause galling of the moving holes h.

  In view of this point, conventionally, as shown in FIGS. 9 and 10, the connecting shaft d is formed of a polygonal bar such as a square, and the connecting shaft sliding hole h is formed into a polygonal hole corresponding to this. By forming it, a square hole fitting method in which the connecting shaft d cannot rotate in the connecting shaft sliding hole h is taken so that the straight-up piece piece c does not rotate.

  However, in order to adopt the square hole fitting method, it is necessary to form a polygonal connecting shaft sliding hole h in the fixed mold a, and the connecting shaft sliding hole h is formed in a polygonal shape. First, after forming the circular hole, it is necessary to form it into a polygonal hole using a method such as wire cutting, which increases the number of processing steps for the connecting shaft sliding hole h.

  In addition, the fitting of the polygonal connecting shaft d to the polygonal connecting shaft sliding hole h is more likely to cause galling compared to the circular fitting, and to repair this when galling deformation occurs. However, unlike the case of circular hole fitting, it is not possible to correct the caulking portion using a tool such as a reamer, which increases the number of correction work steps.

  Therefore, the present invention is configured so that the straight-up piece piece does not rotate with respect to the fixed-side mold even if the straight-up piece piece is configured to be fitted with a round hole between the connecting shaft sliding holes. An object of the present invention is to provide a molded resin mold apparatus.

The resin molding die apparatus according to the present invention forms a cavity having a predetermined shape by moving the moving side mold to the fixed side mold and clamping the mold, and injecting molten resin into the cavity to form the resin After the molding of the resin molded product, the resin molded product is formed by a straight piece piece pushed up by an ejector plate installed on the fixed side mold side with the mold release operation of the moving side mold. A molding die apparatus configured to be removed from a fixed die, wherein one end side is connected to the straight-up piece piece to transmit the pushing-up operation of the ejector plate to the straight-up piece piece, and the like. A connecting shaft whose end side is connected to the ejector plate side is slidably fitted into a connecting shaft sliding hole formed in the fixed side mold, and is parallel to the connecting shaft to the straight-up piece. As described above, at least one guide rod is protruded, and a guide rod sliding hole is formed in the fixed-side mold so that the guide rod slides in accordance with the pushing-up operation of the straight raising piece. .

  According to the present invention configured as described above, in addition to the connecting shaft that transmits the pushing-up operation of the ejector plate to the straight-up piece piece, at least one guide is parallel to the straight-up piece piece and parallel to the connecting shaft. By forming the guide rod sliding hole in the fixed die, the rod is projecting and the guide rod slides in accordance with the push-up operation of the straight-up piece, even if the connecting shaft and the connecting shaft sliding hole are fitted in round holes. Even if the connecting shaft breaks due to some reason, even if the directly raised piece collides with the fixed side mold, even if a rotational force is applied to the directly raised piece, The guide rod abuts against the hole wall of the guide rod sliding hole so that the rotational force does not rotate, and as a result, the molding surface of the fixed die and the moving die or the straight raising piece does not rotate. A heavy breakage of a piece It is possible to stop, so that the occurrence of galling or the like of the connecting shaft sliding hole of the stationary mold side due to damage or connecting shaft of the connecting shaft can be prevented.

It is a schematic longitudinal cross-sectional view of the resin molding die apparatus which employ | adopted one Example in this invention. It is principal part sectional drawing which drawn the mold opening state in the resin mold apparatus in FIG. FIG. 2 is a cross-sectional view of a main part in which a state in which a movable side mold in the middle of mold clamping is in contact with a straight-up piece piece is in a split state due to breakage of a connecting shaft in FIG. 1; It is AA sectional drawing of FIG. It is principal part sectional drawing which drawn the mold opening state in the resin molding die apparatus which employ | adopted the other Example in this invention. It is BB sectional drawing of FIG. It is principal part sectional drawing which drawn the mold opening state in one conventional resin molding die apparatus. Similarly, it is the principal part sectional drawing which drew the state which became the division | segmentation state by breakage of a connection shaft, and the movement side metal mold | die in the middle of mold clamping contact | abutted to the straight-up piece piece. It is principal part sectional drawing which drew the state which became the division | segmentation state by the breakage of the connection shaft in the other conventional resin molding die apparatus, and the movement side metal mold | die in the middle of mold clamping contact | abutted to the straight raising piece. It is CC sectional drawing of FIG.

  Next, embodiments according to the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic longitudinal sectional view of a resin molding die apparatus adopting the first embodiment of the present invention, and FIG. 2 is a cross-sectional view of a main part in which the mold opening state of the resin molding mold apparatus in FIG. FIG. 3 is a fragmentary cross-sectional view depicting a state in which the connecting shaft in FIG. It is A sectional drawing.

  First, in FIG. 1, a vacuum forming apparatus according to the present invention includes a fixed mold 1 and a moving mold 2, and the moving mold 2 is moved with respect to the fixed mold 1. A cavity 3 having a predetermined shape is formed by clamping the mold, and a molten resin is poured into the cavity 3 and solidified to mold a resin molded product 4 such as a door trim.

  The fixed-side mold 1 is attached to a holder plate 5 installed on a factory floor or the like, while an ejector plate that constitutes an eject mechanism on the upper part of the holder plate 5 so as to be parallel to the holder plate 5. 6 is provided.

  The ejector plate 6 has an ejector rod 6a attached to the lower surface side thereof, and is configured to be movable in the vertical direction with respect to the fixed mold 1.

  On the upper surface side of the ejector plate 6, the other end side of the connecting shaft 8 on which the straight-up piece piece 7 is mounted on one end side is mounted.

  Further, a pair of guide rods 9 and 9 facing each other are mounted on the straight-up piece 7 so as to be parallel to the connection shaft 8 on the outside of the connection shaft 8.

  The fixed-side mold 1 is formed with a connecting shaft sliding hole 10 through which the connecting shaft 8 slides and guide rod sliding holes 11, 11 through which the guide rods 9, 9 slide.

  Further, the fixed-side mold 1 is provided with a recessed piece storage portion 12 that opens to the molding surface 1a side and stores the straight-up piece piece 7. The piece-piece storage portion 12 includes a straight-up piece piece. 7 is configured to be accommodated in a flush state with respect to the molding surface 1 a of the fixed mold 1.

  The moving side mold 2 is connected to the elevating cylinder 13 and is configured to move up and down a predetermined stroke with respect to the fixed side mold 1 by driving the elevating cylinder 13.

  In the embodiment according to the present invention configured as described above, as shown in FIG. 1, the moving-side mold 2 is lowered to the fixed-side mold 1 side by driving the elevating cylinder 13, and the fixed-side mold. A cavity 3 is formed by the molding surface 1 a of 1 and the molding surface 2 a of the moving mold 2, and molten resin is poured into the cavity 3 to solidify, thereby molding a resin molded product 4 having a predetermined shape.

  Thereafter, the movable mold 2 is raised by driving the elevating cylinder 13 with respect to the fixed mold 1 to release the resin molded product 4. Along with this release operation, the ejector plate 6 pushes up the connecting shaft 8 while slidingly guiding the connecting shaft 8 in the connecting shaft sliding hole 10, and this push-up operation is transmitted to the upright piece piece 7. Pushes up the resin molded product 4 fitted on the molding surface 2a of the fixed mold 1 and removes the mold (state shown in FIG. 2). At this time, the guide rod 9 also slides in the guide rod sliding hole 11 to guide the pushing-up operation of the connecting shaft 8.

  In such a series of operations, the connecting shaft 8 may break at a place as indicated by reference numeral 14 for some reason.

  If the broken portion 14 is formed in the connecting shaft 8 in this way, when the next resin molded product 4 is molded from the state shown in FIG. 2, first, the ejector plate 6 is operated to move the connecting shaft 8. The straight-up piece piece 7 is housed in the piece piece storage portion 12 through the above-described structure. As shown in FIG. 2, when the broken portion 14 is formed on the connecting shaft 8, the ejector plate 6 is operated. However, as shown in FIG. 3, only the lower end portion of the connecting shaft 8 moves down in conjunction with the ejector plate 6, and the upper end portion is separated from the lower end portion by the dimension Z, and as a result. The straight piece 7 will be left behind.

  In such a state, when the moving mold 2 is moved downward by driving the lifting cylinder 13 to form the cavity 3, the moving mold 2 collides with the straight piece piece 7. Therefore, for example, the rotational force in the direction of the arrow in FIG.

  However, even if a rotational force is applied to the straight-up piece 7, as shown in FIGS. 3 and 4, the pair of guide rods 9 and 9 are fitted in the guide rod sliding holes 11 and 11. Therefore, the rotational force applied to the straight-up piece piece 7 is absorbed by the guide rods 9, 9 coming into contact with the hole walls of the guide rod sliding holes 11, 11, and stretching. The straight-up piece piece 7 can prevent the connecting shaft 8 from rotating with respect to the stationary mold 1 in the connecting shaft sliding hole 10.

  Therefore, even if the connecting shaft 8 and the connecting shaft sliding hole 10 have a round hole fitting relationship, even if the connecting shaft 8 is broken for some reason, Even if it collides with the fixed mold 1, the straight-up piece 7 does not rotate by the action of the guide rod 9, and as a result, the molding surfaces 1 a of the fixed mold 1 and the movable mold 2. 2a or the straight-up piece piece 7 can be prevented from being severely damaged, and the connection shaft 8 can be prevented from being damaged, and the connection shaft sliding hole 10 on the fixed mold side caused by the connection shaft 8 can be prevented from being generated. Become.

  5 and 6 show another embodiment according to the present invention.

  In the above embodiment, the straight-up piece 7 is configured to move up and down in the vertical direction similar to the up-and-down movement direction of the moving-side mold 2 with respect to the fixed-side mold 1, whereas FIG. 6 is configured to move up and down while being inclined at a predetermined angle with respect to the vertical direction.

  For this purpose, the connecting shaft sliding hole 10 and the guide rod sliding hole 11 are formed so as to incline at a predetermined angle with respect to the vertical direction of the fixed mold 1, In addition, an inclined surface 7a is formed, and correspondingly, an inclined inner wall 12a is formed in the piece piece storage portion 12, and the upright piece piece 7 is inclined along the inclined inner wall 12a. It is accommodated in the part 12.

  Even if the straight-up piece piece 7 is stored in the piece-piece storage portion 12 in an oblique direction, the straight-up piece piece 7 is flush with the molding surface 1 a of the fixed mold 1. A stepped portion 7b is formed by engraving the side facing the inclined surface 7a into a substantially right-angled shape so as to be housed in the piece housing portion 12, and in the piece piece housing portion 12 on the fixed mold 1 side. The side facing the inclined inner wall 12a is attached to a concave step 12b formed in a substantially right-angle shape.

  Further, the connecting shaft 8 and the pair of guide rods 9 positioned so as to sandwich the connecting shaft 8 are arranged in the vertical direction in plan view as shown in FIG.

  Therefore, in another embodiment of the present invention configured as described above, even if the connecting shaft 8 is broken, the connecting shaft 8 is fixed to the fixed side metal in the connecting shaft sliding hole 10 by the action of the guide rod 9. It does not rotate with respect to the mold 1, and as a result, the straight-up piece piece 7 does not rotate due to the collision of the moving side mold, and as a result, the molding surface 1a of the fixed side mold 1 and the moving side mold 2 2a or the straight-up piece piece 7 can be prevented from being severely damaged, and the connection shaft 8 can be prevented from being damaged, and the connection shaft sliding hole 10 on the fixed mold side caused by the connection shaft 8 can be prevented from being generated. Become.

  In the above embodiment, a pair of guide rods 9 are provided. However, the guide rods 9 are not limited to this, and may be three or more. However, if at least one guide rod 9 is provided, It can stop rotation.

  As described above, the present invention is such that even if the straight-up piece piece is configured to be fitted into a round hole between the connecting shaft sliding holes, the straight-up piece piece rotates with respect to the fixed mold. By configuring so as not to cause heavy damage to the molding surfaces of the fixed side mold and the moving side mold or the straight up piece, the connection shaft slide on the fixed side mold side due to the connection shaft breakage or the connection shaft is prevented. Since it is possible to prevent galling of the moving holes, it is suitable for a molding die apparatus for molding a resin molded product such as an interior part such as an automobile door trim.

DESCRIPTION OF SYMBOLS 1 Fixed side metal mold | die 1a Molding surface 2 Movement side metal mold | die 2a Molding surface 3 Cavity 4 Resin molded product 6 Ejector plate 7 Straight raising piece piece 8 Connection shaft 9 Guide rod 10 Connection shaft sliding hole 11 Guide rod sliding hole 12 Piece Single storage

Claims (1)

  A cavity having a predetermined shape is formed by moving the moving side mold to the fixed side mold and clamping the mold, and a molten resin is injected into the cavity to mold a resin molded product, and then molding the resin molded product A configuration in which the resin molded product is removed from the fixed-side mold by a straight piece piece pushed up by an ejector plate installed on the fixed-side mold side in accordance with the release operation of the moving-side mold. In order to transmit the pushing-up operation of the ejector plate to the straight-up piece piece, one end side is connected to the straight-up piece piece and the other end side is connected to the ejector plate side. A shaft is slidably fitted in a connecting shaft sliding hole formed in the fixed mold, and at least one guide is parallel to the straightening piece so as to be parallel to the connecting shaft. Projecting rod, molding die apparatus characterized by said guide rod to form a guide rod sliding hole for sliding according to the push-up operation of the straight-up piece piece to the fixed mold.