JP5217080B2 - Resin mold with slide core - Google Patents

Description

  The present invention relates to a resin molding mold with a slide core for forming various molded products using various molding resin materials.

  A conventional resin mold with a slide core has a slide core that is provided with a cavity and is slidably movable, and is composed of an upper mold and a lower mold that can be opened and closed. On the surface, a cold slug reservoir is provided so that cold slug in resin molding does not interfere with the molded product.

As prior art document information relating to this application, for example, Patent Document 1 is known.
JP 2004-50577 A

  However, in the conventional resin mold with a slide core, when a cold slug reservoir is provided on the upper surface of the slide core, a part of the slide core is pulled to the cold slug reservoir when the slide core is opened and closed. Problems such as hooking and tearing off the runner part occur.

  Therefore, it is not possible to provide a cold slug reservoir on the upper surface of the slide core, and the cold slug in the nozzle and sprue of the resin molding equipment flows into the gate, which is the flow path of the molding resin, attached to the molded product. In addition, the fluidity of the molding resin is hindered by closing the gate, and the molding resin is not filled in the molded product, so that stable resin molding, that is, a molded product cannot be performed.

  Also, since the cold slug reservoir cannot be provided on the upper surface of the slide core, it is not possible to take the method of releasing the runner from the sprue bushing by providing an undercut shape in the cold slug reservoir. There was a problem of lowering the efficiency for continuous production, such as following the movement of the upper mold of the molding die, that is, the runner damaged and separated the molded product.

  The present invention is intended to solve the above-mentioned problems, and at one end of the spigot block, the flow of the molding resin in the pool portion of the sprung bush made of the relief shape is prevented, and the upper mold of the resin mold is opened and closed. When the spigot block rises and the slide core is slid and moved to open, the slide core can slide and move without interfering with the sprue bushing reservoir and part of the slide core. It is an object of the present invention to provide a resin mold with a slide core that improves the efficiency for continuous production without the runner portion being torn off from the molded product.

  In order to achieve the above object, the present invention has the following configuration.

According to the first aspect of the present invention, an upper die and a lower die that can be opened and closed with their parting surfaces facing each other, and the upper die and the lower die are disposed between the upper die and the lower die to form a molded product. A pair of slide cores having a cavity portion and having a fitting groove and a cold slug reservoir on either one of the upper surfaces, provided on one surface of the upper mold, and having a tip fitted into the fitting groove, It consists of an inlay block that allows sliding movement, and by making the cold slug reservoir part an undercut shape, the sliding movement of the slide core is free, and cold slug can flow into the molded product part. In addition, the molded product and the accessory formed at the time of molding are not damaged, and there is an effect that a highly accurate and stable resin molding can be performed.

A resin molding die with a slide core according to the present invention is disposed between an upper die and a lower die that are openable and closable with the parting surfaces facing each other, and for forming a molded product. A pair of slide cores having a cavity portion and having a fitting groove and a cold slug reservoir on either one of the upper surfaces, provided on one surface of the upper mold, and having a tip fitted into the fitting groove, It is made up of an inlay block that allows sliding movement, and the cold slug reservoir has an undercut shape , so that even if a spool bush is provided on the slide core, the runner can move when the slide core slides. There is no damage to the molded product due to tearing, etc., and the cold slug reservoir can be installed in an appropriate place, so cold slug There is no flow into the portion of the molded product, those having an effect of stable resin molding with high accuracy.

Hereinafter, with reference to the embodiment, it will be described with reference to FIG surface.

  FIG. 1 is a cross-sectional view of a main part showing the structure of a resin molding die in an embodiment of the present invention, FIG. 2 is a plan view of the main part showing the structure of the resin molding die, and FIG. FIG. 4 is a cross-sectional view of the main part for explaining the operation process in the same type open state, FIG. 5 is a cross-sectional view of the main part for explaining the operation process in the open / close state of the slide core, and FIG. FIG. 7 is a fragmentary plan view and partial sectional view showing an undercut shape of a reservoir portion of the cold slug.

  First, in FIG. 1, 1 is a slide core A made of steel, super steel, or the like. One or a plurality of reservoirs 6 for storing cold slug generated during injection of molding resin and molding are provided on one side. It can slide and move freely.

  2 is a slide core B made of a steel material or a super steel material, which is slidable and movable horizontally facing the slide core A1 and the parting surface 3, and is made of a steel material or a super steel material and can be freely opened and closed. The mold 12 and the lower mold 13 are movable in parallel to the parting surface 3 of the pair of molding dies.

  Reference numeral 4 denotes a cavity portion in which a hollow portion for obtaining a molded product 14 having a desired shape is formed. The molded product 14 having a desired shape is formed by setting and arranging the slide core A1 and the slide core B2. Is a sprue which is a passage for injection and flow of molding resin, and 8 is a runner.

  As described above, 6 is a reservoir portion for storing cold slug provided in the vicinity of the cavity portion 4 on the upper surface of the slide core A1, and 5 is an inlay block made of steel or the like, which is attached to the upper die 12 and has a lower tip. Is fitted in a fitting groove 10 provided at the edge of the reservoir portion 6, and the cavity portion 4 and the reservoir portion 6 are cut off and separated, and injection of molding resin into the reservoir portion 6 of the cold slug or injection of molding resin is performed. It prevents flow.

  Reference numeral 7 in FIG. 2 denotes a relief portion, which is provided on the upper surface of the slide core A1 so as to be connected to the fitting groove 10. When the slide core A1 slides, for example, when the slide core B2 is opened and closed, the pool portion 6 and the slide The interference with the core A1 and the trouble that the cold slug is caught on a part of the slide core A1, that is, the damage of the molding resin in the molded product 14 are prevented.

  As shown in FIGS. 1 to 3, the molding resin flows through the sprue 11, the cold slug reservoir 6, the runner 8, and the gate 9, and is injected into the cavity 4 to form a molded product 14.

  FIG. 3 shows a state of the resin molding die immediately after predetermined resin molding. The lower tip of the inlay block 5 is inserted into the fitting groove 10 of the slide core A1 from the upper mold 12, and molding in the cold slug reservoir 6 is performed. This prevents unnecessary flow of resin.

  Reference numeral 18 denotes an ejector pin that can be fixed and moved up and down to maintain the molded product 14 at one end when the lower mold 17 is moved (downward).

  FIG. 4 shows a state in which the upper mold 12 is lifted and separated from the slide core A1 and the slide core B2, and the molded resin portion in the sprue 11 and the product upper part 15 of the molded product 14 are formed on the slide core A1 and the slide core B2. It is exposed on the top surface.

FIG. 5 shows a state in which the slide core A1 and the slide core B2 are opened by sliding in the horizontal direction. At this time, the cold slug reservoir 6 slides without interfering with or catching on the slide core A1. it is possible to open and close the core A1 and the slide core B2, molded resin portion of the sprue 11, the product top 15 of the molded product 14, the molded resin portion of the reservoir 6 and the escape and section 7, and a product bottom 16 in the forming product 14 Exposed.

  FIG. 6 shows a state in which after the slide core is opened, the lower mold 17 is fixed, the ejector pin 18 is raised, and the molded product 14 is released from the resin mold, and the lower part 16 is included. The molded resin portion of the molded product 14 and the accompanying sprue 11, the molded resin portion of the runner 8 and the gate 9, etc. are exposed, and the ejector pin 18 is lowered in a state where a series of resin molding processes have been completed. The molded product 14 is moved to the next process while being attached.

  In contrast to the above, the ejector pin 18 may be fixed and the lower mold 17 may be lowered to release the molded product 14 from the resin mold.

  FIG. 7 is an enlarged view of the main part shape of the cold slug reservoir 6, and the shape of the cold slug reservoir 6 is obtained by following the sprue 11 when the upper mold 12 is raised. In order to prevent the molded product 14 from being damaged or the like, it is necessary to make the lower tip portion undercut.

  That is, as shown in FIG. 7, the sprue 11 is caused by the movement of the upper mold 12 by providing a structure in which a predetermined angle, such as an angle of 30 to 60 degrees, is formed on the three surfaces A, B and C. The occurrence of follow-up, that is, damage to the molded product 14 due to forced separation of the sprue 11 from the molded product 14 main body can be prevented.

  The undercut of this shape is not provided with an undercut in the opening / closing direction of the slide core A1 and the slide core B2, that is, the part (surface) that obstructs the sliding movement, and the opening and closing of the slide core is smooth without difficulty. Can be operated.

  The resin molding die with a slide core according to the present invention is such that even if a sprue bush is provided on the slide core, the runner is not torn off when the slide core slides, and the cold slug does not flow into the molded product part. It has the effect of being able to perform highly accurate and stable molding, and is useful as a resin molding die for resin molding various molded members and products.

Sectional drawing which shows the principal part which shows the structure of the resin molding die in embodiment of this invention Plan view of the main part showing the structure of the resin mold Cross-sectional view of the main part explaining the operation process in the same type closed state Cross-sectional view of the main part explaining the operation process in the same mold open state Cross-sectional view of the main part explaining the operation process in the open / close state of the slide core Cross-sectional view of the main part configuration explaining the operation process in the state of protruding the molded product Main part plane and partial sectional view showing the undercut shape of the reservoir of the cold slug

1 Slide core A
2 Slide core B
DESCRIPTION OF SYMBOLS 3 Parting surface 4 Cavity part 5 Inner block 6 Reservoir part 7 Relief part 8 Runner 9 Gate 10 Fitting groove 11 Spru 12 Upper mold 13 Lower mold 14 Molded product 15 Product upper part 16 Product lower part 17 Lower mold 18 Ejector pin

Claims (1)

The upper mold and the lower mold that can be opened and closed with the parting surfaces facing each other, and a cavity for forming a molded product are provided between the upper mold and the lower mold, and on either one of the upper surfaces and the slide core pairs having a reservoir portion of the groove and the cold slug fitted, provided on one surface of said upper die, and a spigot block tip to allow sliding movement of said slide core fitted into the fitted groove, from A resin mold with a slide core in which the cold slug reservoir is undercut .

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