JPH0726111U - Manifold in resin mold - Google Patents

Abstract

(57) [Abstract] [Purpose] Resin molding capable of suppressing the flow resistance of the molten resin at the branch portion of the molten resin passage as much as possible, and allowing the molten resin to smoothly flow along the inside of the molten resin passage. An object is to provide a manifold in a mold. [Structure] A recess 25e of a manifold body 25d forming a wall surface of the molten resin passage 25b and a fitting body 25f are fitted to each other, and the manifold body 25d and the fitting body 25 are fitted together.
By joining the surfaces facing each other with f, a molten resin passage 25b is formed inside.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a manifold in a resin molding die in which a molten resin passage is formed.

[0002]

[Prior art]

 Conventionally, in this type of manifold, as shown in FIG. 5, a hole is drilled from the outside to form a large number of holes 1 intersecting with each other. A molten resin passage 3 is formed inside by closing an object (reference numeral 2 indicates a closed portion).

[0003]

[Problems to be solved by the device]

 However, when the molten resin passage 3 that branches inside is formed by drilling as described above, since the branched portions 4 of the molten resin passage 3 intersect at a right angle, these branched portions 4 In the above, there is a problem that the flow resistance of the molten resin becomes large and the molten resin does not flow smoothly.

The present invention has been made in view of the above circumstances. An object of the present invention is to prevent flow resistance of the molten resin in the branch portion of the molten resin passage as much as possible, It is an object of the present invention to provide a manifold in a resin molding die, which allows a molten resin to smoothly flow along it.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is a manifold in a resin molding die having a molten resin passage formed therein, wherein a fitting body is fitted in a recess formed in the manifold body, and the manifold is The wall surface of the molten resin passage is constituted by the main body and the fitting body, and the facing surfaces of the manifold main body and the fitting body are joined together.

[0006]

[Action]

 In the manifold of the resin molding die of the present invention, the concave portion of the manifold main body forming the wall surface of the molten resin passage and the fitting body are fitted to each other, and the opposing surfaces of the manifold body and the fitting body are joined together. As a result, a molten resin passage is formed inside.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS.

In the figure, reference numeral 10 is a fixed mold plate, and a cavity mold 11 is incorporated in this fixed mold plate 10. The fixed mold plate 10 is attached to the fixed attachment plate 15 via the first and second fixed receiving plates 12 and 13 and the spacer block 14. Further, a movable mold plate 17 having a core mold 16 assembled therein is provided so as to be opposed to the fixed mold plate 10 so as to be able to come into contact with and separate from the fixed mold plate 10. Then, a cavity 18 is formed between the cavity mold 11 and the core mold 16. Further, the movable mold plate 17 is attached to the movable mounting plate 21 via the movable receiving plate 19 and the spacer block 20. Further, a locate ring 22 and a sprue bush 23 are attached to the fixed mounting plate 15, and a manifold is provided between the fixed mounting plate 15 and the second fixed receiving plate 13 via a distance piece 24. 25 are installed. A runner bush 26 is installed in the second and first fixed receiving plates 13 and 12, and the cavity mold 11. The molten resin supplied from the injection molding machine is sprue bush 23, manifold 25, runner bush. It is configured to be injected from the gate into the cavity 18 through the inside of each of 26. Further, first and second projecting plates 27 and 28 are movably provided between the movable receiving plate 19 and the movable mounting plate 21, and the base ends are fixed to these projecting plates 27 and 28. The ejector pin 29 penetrates the movable receiving plate 19 and the core mold 16 and projects into the cavity 18. Reference numeral 30 is a stopper that supports the first and second projecting plates 27 and 28.

As shown in FIGS. 1 to 3, molten resin passages 25 a, 25 b, 25 c extending from the sprue bush 23 side to each runner bush 26 are formed inside the manifold 25. The molten resin passages 25a, 25b, 25c are formed in the manifold main body 25d and the fitting body 25f fitted in the H-shaped recess 25e formed in the manifold main body 25d. 25a, 25b, 25c and the branched portion of the molten resin passage 25b communicate with each other in an arc R. Further, the interval between the facing surfaces of the manifold body 25d and the fitting body 25f is set to 30 to 50 μm, and these facing surfaces are joined by a brazing material 31 such as silver solder or Ni solder. Here, the reason why the gap between the facing surfaces of the manifold body 25d and the fitting body 25f is set to 30 to 50 μ is that if the gap is smaller than 30 μ, the brazing material 31 melted during brazing will slip smoothly. This is because, if the space does not penetrate between the opposed surfaces, but the space exceeds 50 μ, the bonding strength decreases and the bonding is not ensured.

In the manifold 25, an H-shaped recess 25 e is formed in the manifold body 25 d in advance, and half of the H-shaped molten resin passage 25 b is carved into the recess 25 e and four molten While forming the resin passage 25c, an H-shaped fitting body 25f that fits into the recess 25e of the manifold body 25d is formed, and the remaining half of the H-shaped molten resin passage 25b is formed in the fitting body 25f. After engraving and drilling one molten resin passage 25a, with the manifold body 25d and the fitting body 25f fitted together, as shown in FIG. 3, a cutout 25g formed in the manifold body 25d. It is completed by charging the brazing material 31 into the, and quenching at 1100 ° C., and at the same time, brazing and bonding. In this case, the raw material 31 melted by the heat at the time of quenching easily penetrates between the facing surfaces of the manifold body 25d and the fitting body 25f and spreads evenly over the entire facing surface, so that it fits with the manifold body 25d. While the surfaces facing the united body 25f are reliably joined together, the molten brazing material 31 does not exude into the molten resin passage 25b, so that the molten resin passages 25a, 25b, 25c are formed smoothly. It

In the injection molding die in which the manifold 25 formed in this manner is incorporated, the molten resin injected from the injection molding machine after completion of the mold clamping is spoiled by the sprue bush 23, the manifold 25, and It is supplied from the gate into the cavity 18 through the inside of the runner bush 26. In this case, since the melted resin passages 25a, 25b, 25c in the manifold 25 are communicated with each other in a circular arc R at their branch portions, the melted resin passages 25a, 25b, 25c Flow resistance can be reduced, and molten resin can be smoothly circulated. Then, after the resin filled in the cavity 18 is cooled and solidified, the mold is opened and the molded product in the cavity 18 is released by the ejector pin 29.

[0012]

[Effect of device]

 As described above, the present invention is a manifold in a resin molding die in which a molten resin passage is formed, wherein the fitting body is fitted in the recess formed in the manifold body, and Since the wall surface of the molten resin passage is formed by the fitting body and the facing surfaces of the manifold body and the fitting body are joined together, the branch portion of the molten resin passage formed inside is formed. By smoothly branching, the flow resistance of the molten resin can be suppressed as much as possible, and the molten resin can be smoothly circulated along the molten resin passage.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

3 is a cross-sectional view taken along the line III-III in FIG.

FIG. 4 is a cross-sectional view showing an example of an injection molding die.

FIG. 5 is a perspective view showing a conventional manifold.

[Explanation of symbols]

 25 Manifold 25a / 25b / 25c Molten Resin Passage 25d Manifold Main Body 25e Recess 25f Fitting

Claims (1)

[Scope of utility model registration request] 1. A manifold in a resin molding die in which a molten resin passage is formed, wherein a fitting body is fitted in a recess formed in the manifold body, and the manifold body and the fitting body form the fitting body. A manifold in a resin molding die, characterized in that a wall surface of a molten resin passage is constituted, and opposing surfaces of the manifold body and the fitting body are joined to each other.