JPH0516250U - Injection mold - Google Patents

Abstract

(57) [Summary] [Structure] Ribs 35 are provided corresponding to the product shape to be obtained on the molding surface of the core 20, and the portions 31 and 32 provided with the ribs 35 are removable from the other portions 22. It [Effect] When the rib 35 is worn or damaged, the portions 31 and 32 where the rib 35 is provided are replaced with other portions 22.
It can be removed from and replaced with a new one. Therefore, it is not necessary to replace the entire core 20, and the maintenance cost of the molding die can be kept low.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an injection molding die in which a concave portion or a convex portion is provided corresponding to a product shape to be obtained on a molding surface for injection molding a molten resin in a cavity.

[0002]

[Prior Art]

 When the product to be obtained needs convex portions, concave portions, through holes, etc., the concave surface or convex portion is integrally provided on the molding surface of the mold. In this case, the flow of the raw material (molten resin) at the time of molding tends to cause abrasion or damage to the concave portion or the convex portion.

[0003]

[Problems to be solved by the device]

 However, even if the recesses or protrusions are worn or damaged as described above, it is difficult to repair such parts, especially fine parts such as a large number of ribs arranged side by side. If it takes a long time, even if there are no problems in other parts, the entire mold is replaced, which is uneconomical and the maintenance cost of the molding die is high.

In view of the above point, the present invention can solve such a problem even if the concave portion or the convex portion is worn or damaged, without replacing the entire mold, thereby reducing the maintenance cost of the molding die. It is an object of the present invention to provide an injection molding die that can be held down.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the injection molding die according to the present invention is provided with a concave portion or a convex portion corresponding to the product shape to be obtained on the molding surface for injecting the molten resin in the cavity. Alternatively, it is characterized in that the portion provided with the convex portion is removable from other portions.

In this case, the recessed portion or the protruding portion provided on the molding surface of the mold includes through holes, holes, steps, ribs, protrusions and the like, and the removable portion is the recessed portion or the protruding portion. It is desirable that a plurality of concave portions or convex portions including the base portion side can be simultaneously removed.

[0007]

[Action]

 In the injection molding die according to the present invention configured as described above, when wear or damage is caused to the concave portion or the convex portion, the portion provided with the concave portion or the convex portion is replaced with another portion. It can be removed from and replaced with a new one. Therefore, it is not necessary to replace the entire mold, and the maintenance cost of the molding mold can be kept low.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a main part of an embodiment of an injection molding die according to the present invention. In FIG. 1, a core 20 of the die has a core main body portion 22 and a base portion on which a plurality of ribs 35 are projected. The rib base parts 31 and 32 are made of a resin and the molten resin filled in the cavity 15 provided between the mold 10 and the mold 10 is injection-molded.

As shown in detail in FIG. 2, the rib base portions 31 and 32 are fitted into the holes 25 provided in the core body portion 22 and are provided on the rib base portions 31 and 32. The set bolt 40 inserted into the diameter hole 36 and the small diameter hole 39 is screwed into the female screw portion 27 provided in the core body portion 22 to be fixed to the core body portion 22. In the fixed state, the upper surface of the base portion 34 and the molding surface of the core main body portion 22 are flush with each other.

When the stop bolt 40 is screwed, a space is formed above the large-diameter hole 36, so that the filling member 42 is fitted to fill the space. Therefore, the rib bases 31 and 32 are flush with the molding surface of the core body 22 except for the ribs 35. In the core 20 having the above-described structure, when the rib 35 is worn or damaged, the filling member 42 and the fixing bolt 40 are pulled out to remove the rib base portions 31 and 32 from the other portions, and a new one is obtained. Can be exchanged for things. Therefore, it is not necessary to replace the entire core, and the maintenance cost of the molding die can be kept low.

[0011]

[Effect of the device]

 As is clear from the above description, in the injection molding die according to the present invention, when the concave portion or the convex portion is worn or damaged, the portion provided with the concave portion or the convex portion is removed from the other portion. Since new parts can be replaced with new parts, there is no need to replace the entire mold, and the advantage is that maintenance costs for the mold can be kept low.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part of an embodiment of an injection molding die according to the present invention.

FIG. 2 is an exploded perspective view showing in detail a main part of the core shown in FIG.

[Explanation of symbols]

 20-Core 31, 32-Rib base 35-Rib 40-Bolt 42-Packing member

Claims (1)

[Scope of utility model registration request] 1. A recess or a protrusion is provided corresponding to a product shape to be obtained on a molding surface for injection-molding a molten resin in a cavity, and the region where the recess or the protrusion is provided can be removed from other regions. A mold for injection molding, characterized in that