KR940007325Y1 - Ejecting device for undercut articles - Google Patents

Abstract

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Description

Extraction device for products with undercut shape of injection molding machine

Figure 1 (a) is an embodiment of the present invention at the time of product molding, (b) is an embodiment of the invention at the time of extraction of the molded product.

2 is an enlarged view of a portion “A” of FIG. 1.

* Explanation of symbols for main parts of the drawings

12, 22: upper and lower mold 50: platform

80: slide core 81: undercut groove

85: through hole 83: one side inner surface

90: slide pin 91: one side

121, 221: guide part

The present invention relates to an injection molding machine, an apparatus for extracting an article having an undercut shape formed so that the product can be safely extracted after forming an undercut shape inside the product.

Conventionally, when forming an undercut shape inside a product, since the slide structure of the mold is formed to be divided into inner and outer slides and other structures, the structure of the mold becomes very complicated and difficult. There have been many problems in forming the undercut shape, such that the product shape is greatly restricted and the required product shape cannot be obtained.

The present invention was devised to solve these problems in the related art, and the molded product is formed by installing the undercut-shaped slide core of the undercut shape on the side of the upper surface of the lower mold coupled to the inner upper portion of the lower disk by the eject pin. Since the slide core is horizontally moved inward by the eject pin when vertically upwardly extracted, the undercut formation is to safely extract the molded product.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings as follows.

1 is a view showing the molding and extraction state of the product 101 according to the embodiment of the present invention, the upper and lower fixing plates (10, 20) on the bottom and upper surfaces respectively installed And an image coupled to the intermediate positions of the surfaces of the discs 11 and 21 in contact with each other. The lower die 12, 22, the stripper plate 30 and the push pin 31 and eject pin 32, which pushes out when the molded product 101 is extracted, the lower ends of the push pin and eject pin In the injection molding machine consisting of a support plate 40 for supporting, a platform 50 for elevating the support plate, a safety pin 60 and an ejection guide pin 70, the above image. On one side of the lower dies 12 and 22 in contact with each other, the guide portions 121 and 221 of the appropriate spaces are formed to face each other so that the undercut grooves 81 are formed at the appropriate angles on the outer surfaces of the guide portions. The slide core 80 having the lower one side inner surface 83 of the through hole 82 and the outer surface 84 corresponding thereto formed at an angle with the undercut groove 81 at an angle with the undercut groove 81 to be inclined to form a concave indentation. Horizontally coupled to the left and right to move, the lower end is fixed and installed on one side of the support plate 40 and the upper part through the lower disc 21 and the lower mold 22 vertically through the through hole of the slide core 80 At the same time as being coupled to the 82 is provided with a slide pin 90 formed to be inclined at the same inclination angle as the lower one side inner surface 83 of the through hole 82 at one side 91.

The present invention constituted as described above, the upper fixing plate 10 is lowered in the state in which the lifting platform 50 is lowered as shown in FIG. When the lower molds 12 and 22 are in close contact with each other, the slide core 80 has an outer surface in which the inner end surface of the guide portion 121 is inclined in the guide portions 121 and 221 which are recessed to face each other. 84) is in close contact with the slide core 80 to move to the right, so that the inclined inner surface 83 is in close contact with the upper inclined side surface 91 of the slide pin 90 and the outer surface of the slide core 80 Undercut grooves 81 formed in the upper. It is connected to the inside of one side of the product molding space 100 is formed between the lower mold (12, 22).

In this state, when the raw material is injected through the injection hole 13 of the upper fixing plate 10, the raw material is introduced into the product forming space part 100 to form the product 101. In this process, a part of the raw material is undercut groove ( 81 is also introduced into the product 101, the undercut shape 102 is integrally formed.

After a certain time has elapsed since the upper fixing plate 10 and the platform 50 will rise at the same time. Lower molds 12 and 22 are separated from each other and pushed apart from the lower mold 22 by pushing the finished product 101 by the push pin 31 and the eject pin 32, wherein the push rod Since the slide pin 90 also rises together with the pin 31 and the eject pin 32, one side inner surface 83 of the slide core 80 inclined at the same angle with one side 91 of the top sloped at the same angle. The slide core 80 is moved to the left in the guide part 221 because it is pushed up into the through hole 82.

Therefore, according to the present invention, when the upper mold 12 is vertically raised, the slice core 80 is horizontally moved to the left, so that the molded product 101 is horizontally moved when the molded product 101 is vertically lifted out of the lower mold 22. The undercut shape 102 contained in the undercut groove 81 recessed inclined to its outer surface by the slide core 80 is easily attached as it is integrally attached without falling off from the product 101 which is vertically lifted off. It will be extracted.

The present invention operating in this manner has the same inclination angle as the undercut grooves formed to be inclined to the outer surface by installing a slide core and a slide pin formed on the lower one side of the through hole and the upper one side thereof in contact with the inclined surface, and their action It is a very useful design that makes it possible to easily extract from the mold together with the product so as not to break the shape while forming undercut formation on the product.

Claims (2)

The upper and lower dies 12 and 22 are formed with concave and convex guides 121 and 221 in a proper space on one side of the surfaces in contact with each other, and an undercut groove 81 on the outer surface in the guide portion 221. The slide pins 80 are formed to be inclined to be inclined so that the slide pins 90 and the upper dies 12 are fixed to be lifted vertically by the lifting platform 50. An apparatus for extracting a product in which an undercut shape of an injection molding machine is formed, which is configured to be moved left and right. According to claim 1, One side inner surface 83 of the through hole 82 is vertically drilled through the upper end of the slide pin 90 in the undercut groove 81 and the slide core 80, the inner surface in contact with The upper one side surface 91 of the slide pin 90 is formed to be inclined at the same inclination angle to each other, the extraction device of the molded product undercut shape of the injection molding machine.