JP4837652B2 - Injection mold for insert molding - Google Patents

Description

  The present invention relates to an injection mold for insert molding provided with holding pins on the upper and lower surfaces of a cavity so as to freely enter and exit.

In this type of mold, a required number of holding pins are provided on both sides of a cavity formed by a pair of divided molds so that the holding pins can be moved in and out, and the driving means for the holding pins are provided in both divided molds.
JP 2003-170467 A

  In the conventional mold described above, since the holding means is provided in both the split molds in the hydraulic cylinder and the air cylinder, the structure is more complicated than that in the normal mold, and the incidental device related to the driving means is provided. And a control are required, and there is a problem that a means for operating both driving means simultaneously is also required.

  The present invention has been conceived in order to solve the problems of the above injection mold for insert molding, and its purpose is used as a rotating means for a slide core of a mold and a screw core of a screw mold. By adopting the rack and pinion as an interlocking device for the holding pins in the upper and lower molds, a new insert that can be operated simultaneously with the extrusion rod provided in the injection device without providing the holding pin drive means in the mold The object is to provide an injection mold for molding.

  According to the above-described object, the present invention provides a lower die and an upper die, which are provided in the upper and lower surfaces of the cavity so as to be freely inserted and removed, and are connected to the holding pins and elastically pressed in the anti-cavity direction inside the cavity plate. Connected to the holding plate through the upper mold cavity plate, the protruding plate in the lower mold provided, the holding plate in the upper mold connected to the holding pin and pressed inside the cavity plate in the cavity direction It consists of an interlocking rod that protrudes from the parting surface by the holding stroke of the holding pin, and an interlocking device that meshes the drive rack and the driven rack that reciprocates in the case on both sides of the pinion in the case. Install the driven rack on the cavity plate directly below the interlocking cage, and connect the drive rack to the protruding plate. It is intended to become. In addition, the protruding plate is pressed in the anti-cavity direction.

  In the above configuration, the upper and lower holding pins provided on the lower mold and the upper mold are operated by the operation of the protruding plate by the interlocking device by the rack and pinion on the lower mold side and the interlocking hook on the upper mold side operated by the interlocking device. Because it moves in and out of the cavity surface, the simultaneous operation of the upper and lower holding pins can be performed reliably only by operating the protruding plate with the pressing rod provided in the mold clamping device, so that both the lower mold and the upper mold can be operated as before. Since a driving device for the holding pin is not required, the structure of the mold is simplified. Further, since a driving circuit for the holding pin is not required, it can be easily attached to the mold clamping device as in the case of a normal mold.

  In addition, associating the upper mold side interlocking rod with the driven rack of the lower mold interlocking device, the vertical movement of the driven rack moves the interlocking rod in the mold closed state up and down with the parting surface as a boundary. Since the holding pin can be put in and out at the same time as the holding pin in the lower mold, the insert can be reliably held at the set position in the cavity without any means for mutual holding of the holding pins.

  In addition, the holding pin attached to the protruding plate in the lower mold can be used as a protruding pin after molding, so the protruding pin is omitted and the tip of the pin can be retracted into the cavity surface when the mold is opened, so that the insert is protruding Since it is set on the cavity surface of the lower mold without being placed on the pin, the robot can easily perform the insert.

  In the figure, 1 is a lower mold, 2 is an upper mold, and both molds shown in the figure are composed of cavity plates 11 and 21, mold mounting plates 12 and 22, and spacer blocks 13 and 23. A space 14 is formed inside, and a space 24 is formed inside the upper mold. Further, a rod hole 12a opened in the space 14 is formed in the center of the die mounting plate 12 of the lower die 1.

  Reference numeral 3 denotes a cavity of a plate-like molded product formed on the parting surface by closing the lower mold 1 and the upper mold 2, and the cavity plates 11 and 21 are located at five locations at opposite positions of the center of the cavity upper and lower surfaces and the four corners. The holding pins 15 and 25 in the lower mold 1 and the upper mold 2 are respectively provided through and through. Note that the position and number of holding pins vary depending on the size and shape of the insert.

The holding pins 15 and 15 in the lower mold 1 are connected to a protruding plate 17 inside the cavity plate 11 provided in the space 14 by being elastically pressed in the anti-cavity direction by a spring member 16. The projecting plate 17 is always in pressure contact with the mold mounting plate 12 to maintain the tip positions of the holding pins 15 and 15 on the same plane as the cavity surface.
When the protruding plate 17 is connected to the extrusion rod 6 on the mold clamping device (not shown) side, the protruding plate 17 can be advanced and retracted by the extrusion rod 6, so that the spring member 16 is elastic in the anti-cavity direction. Is no longer necessary.

  The holding pins 25, 25 in the upper mold 2 are connected to a holding plate 27 inside the cavity plate 21 provided in the space 24 by being elastically pressed in the cavity direction by a spring member 26. The holding plate 27 is always in pressure contact with the cavity plate 21, and maintains the tips of the holding pins 25, 25 at a position protruding from the cavity surface by the holding stroke.

  4 is an interlocking rod for moving the holding pin 25 of the upper die 2 in and out simultaneously with the holding pin 15 of the lower die 1, and is connected to the holding plate 27 through the cavity plate 21, and its tip is connected to the holding pin 25 from the parting surface. Only the holding stroke protrudes.

  Reference numeral 5 denotes an interlocking device for holding pins 15 and 25, a case 51 whose inner surfaces on both sides serve as rack guides, a pinion 52 that is rotatably supported in the center of the case, and a guide that is guided by the inner surface of the case to mesh with both sides of the pinion 52. The long drive rack 53 and the short driven rack 54 are formed.

  In this interlocking device 5, a case 51 is attached to the cavity plate 13 and attached to the lower mold 1. The case 51 is attached to the plate with the upper edge the same as the parting surface, and the upper end of the driven rack 54 is positioned on the upper edge to connect the drive rack 53 to the protruding plate 17. Since the protruding plate 17 is always pressed against the die mounting plate 12 by the spring member 16, the driven rack 54 is maintained with the upper edge position of the case 51 as the upper limit position by the connection.

  In the driven rack 54, when the protruding plate 17 is pushed up by the push rod 6 inserted through the rod hole 12a of the die mounting plate 12, the drive rack 53 moves upward together with the protruding plate 17, and the pinion 52 is rotated counterclockwise. Since it rotates, it moves downward. As a result, a receiving space for the tip of the interlocking rod 4 is created in the case at the upper end of the rack.

  In the mold open state shown in FIG. 1, since the protruding plate 17 of the lower mold 1 is pressed against the mold mounting plate 12, the tips of the holding pins 15, 15 do not protrude from the plate and are positioned in the cavity surface. Yes. Accordingly, the insert 7 is set by being inserted by a robot or the like into the cavity surface of the lower mold 1 where the holding pins 15 and 15 do not protrude.

  Further, since the holding plate 27 of the upper die 2 is pressed against the cavity plate 11, the holding pins 25, 25 have their tips set from the cavity surface and the tips of the interlocking rod 4 set from the parting surface. Only protruding.

  As shown in FIGS. 2 and 6, when both molds are closed, the interlocking rack 4 protruding from the parting surface of the cavity plate 21 is positioned on the same surface as the parting surface of the lower mold 1. It hits the top of the. The driven rack 54 is maintained by the drive rack 53 so that the position thereof is not lowered, so that the interlocking rod 4 can be pushed into the plate by the mold closing force and the holding plate 27 comes into contact with the mold mounting plate 22. Push back against the spring member 26. As a result, the tip of the holding pin 25 is retracted into the plate and positioned on the cavity surface.

  3 and 7, when the protruding plate 17 is pushed upward by the push rod 6 as shown in FIGS. 3 and 7, the protruding plate 17 moves upward together with the holding pins 15 and 15 and the drive rack 53. The tip protrudes from the cavity surface, and the lower surface of the insert 7 inserted in advance is held and pushed up by the pin tip. As a result, a resin filling gap is formed between the lower surface of the insert and the cavity surface. At the same time, the drive rack 53 rotates the pinion 52 counterclockwise and pushes down the driven rack 54.

  Since the leading end of the connecting rod 4 is pressed against the upper end of the driven rack 53 by the spring member 26 of the holding plate 27, the leading end of the connecting rod 4 is pushed into the case as the driven rack 54 moves downward. The holding plate 27 moves downward until it comes into contact with the cavity plate 21. As a result, the tips of the holding pins 25, 25 protrude again from the cavity surface and come into contact with the upper surface of the insert 7 whose lower surface is held by the holding pins 15, 15 of the lower mold 1. A filling gap is formed.

  The resin around the insert in the cavity is filled with the protruding plate 17 pressed by the extrusion rod 6. By this pressing, the insert 7 is fixed in the cavity by the upper and lower holding pins 15 and 25, but as shown in the figure, gates 3a and 3a provided at opposite positions on both sides of the cavity as shown in FIG. It is preferable to charge the resin.

  As shown in FIG. 4, the upper and lower holding pins 15 and 25 protruding into the cavity are pulled back into the plate around the end of the resin filling. When the pushing rod 6 is returned to the original position and the pressing force against the protruding plate 17 is removed, the protruding plate 17 is pushed back to the die mounting plate 12 by the spring member 16, and the holding pins 15 and 15 are also returned together with the drive rack 53, and the tip of the pin Retracts to the cavity surface. At the same time, the driven rack 54 moves upward by the clockwise rotation of the pinion 52 due to the downward movement of the drive rack 53, and pushes the interlocking rod 4 back to the parting surface. As a result, the holding plate 27 is pushed up to the die mounting plate 22 against the spring member 26, and the holding pins 25, 25 are retracted into the cavity surface. When the upper and lower pressure-holding pins 15 and 25 are retracted, the traces are filled by the resin filling and the pressure-holding, so that no pin marks remain in the resin layer around the insert.

  When shifting to mold opening after molding, the pressing force on the interlocking rod 4 is removed as the parting surface of the upper die 2 is separated, and the holding plate 27 is constantly pressed by the spring member 26. At the same time, the tips of the holding pins 25, 25 protrude from the cavity surface from the parting surface to the original state. Further, the upper surface of the product 8 that is insert-molded by the protrusion of the holding pin 2425 is released from the cavity surface of the upper mold 2, and the molded product remains in the cavity of the lower mold 1.

  As shown in FIG. 5, when the protruding plate 17 is pressed again by the extrusion rod 6 after opening the mold, the holding pins 15 and 15 protrude from the cavity surface, and the lower surface of the product 8 is released from the cavity surface of the lower mold 1. This re-pressing can be performed by setting the movement stroke of the drive rack 53 to be long because the upper mold 2 is separated by the mold opening and does not become an obstacle to the upward movement of the drive rack 53. 15 and 15 function as projecting pins that project the product 8 from the lower mold 1.

  As described above, in the injection molding die for insert molding having the above-described configuration, due to the related operation of the interlock device on the lower mold side by the rack and pinion operated by the protruding plate and the interlock rod on the upper mold side operated by the interlock device. Since the upper and lower holding pins that can be freely inserted into and removed from the cavity surfaces of the lower mold and the upper mold operate simultaneously, there is no need to provide a driving device for the holding pins in the lower mold and the upper mold. Since it functions as a protruding pin, a protruding pin is also unnecessary.

  The above embodiment is intended for a plate-like insert, but it is also possible to insert-mold a sphere or a rectangular parallelepiped with the same configuration. Therefore, the present invention is applicable to any insert that can be held by the upper and lower holding pins, and is not limited to an injection mold for insert molding of a specific form product.

It is a vertical front view at the time of mold opening of the injection mold for insert molding concerning this invention. It is a longitudinal front view at the time of a mold closing. It is a vertical front view at the time of a holding pin protrusion. It is a vertical front view at the time of holding pin pullback. It is the vertical front view which abbreviate | omitted one part at the time of product protrusion. It is a side view at the time of mold closing. It is operation | movement explanatory drawing which shows a part of rack and pinion in a cross section.

Explanation of symbols

1 Lower mold 2 Upper mold 3 Cavity 4 Interlocking rod 5 Interlocking device 6 Extrusion rod 7 Insert 8 Product 11, 21 Cavity plate 12, 22 Mold mounting plate 15, 25 Holding pin 16, 26 Spring member 17 Projection plate 27 Holding plate 51 Case 52 Pinion 53 Drive rack 54 Drive rack

Claims (2)

A holding pin in the lower mold and the upper mold provided so as to be freely accessible through the cavity plate at positions opposite to the upper and lower surfaces of the cavity,
A protruding plate in the lower mold connected to the holding pin and provided inside the cavity plate;
A holding plate in the upper mold that is connected to the holding pin and elastically pressed in the cavity direction inside the cavity plate;
Linked to the holding plate through the cavity plate of the upper mold, the interlocking rod with the tip protruding from the parting surface by the holding stroke of the holding pin,
It consists of an interlocking device that meshes a drive rack and a driven rack that reciprocates in the case on both sides of the pinion in the case,
An injection mold for insert molding, wherein the interlocking device is mounted on a cavity plate of a lower mold, a driven rack is installed immediately below the interlocking rod, and a drive rack is connected to the protruding plate.   2. The injection mold for insert molding according to claim 1, wherein the protruding plate is pressed in the anti-cavity direction.

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