KR100733871B1 - Mold for retainer forming of rivet bolt - Google Patents

Abstract

A mold for forming a retainer of a rivet bolt is provided to improve productivity by reducing molding time through quick ejecting of frames using an ejecting pin. A mold for forming a retainer of a rivet bolt includes a plurality of forming chambers(2a,4a), and a supporting board(7). The forming chambers face each other at a facing surface of top and bottom forming frames(2,4). Each of the forming chambers at the bottom forming frame includes an ejector pin(6) connected to the supporting board to be projected into the forming chamber by a spring and a guiding pin(8) exposed to the top surface. Each of the forming chambers at the top forming frame includes an ejector pin(12) connected to an elevating panel(10).

Description

Mold for retainer molding of rivet bolt {MOLD FOR RETAINER FORMING OF RIVET BOLT}

1 is a side configuration diagram showing the separation of the present invention

2 is a side configuration diagram showing the combination of the present invention

3 is a sectional view showing the main parts of the present invention during molding

4 is a main cross-sectional configuration of the present invention demould

5: Retainer and bolt perspective view molded by the present invention

<Description of the symbols for the main parts of the drawings>

(2)-upper brother (4)-lower brother

(2a) (4a)-molding chamber (6) (12)-milpin

(8) (16)-Guide Pin (10)-Lamp Plate

(14)-Retainer

The present invention relates to a mold for forming a retainer constituting a rivet bolt, and in particular, to prevent a defect caused by the air pressure remaining in the molding process.

The rivet bolt is composed of a retainer having several extension parts and bolts for engaging and securing the coupling member by extending the extension part when tightening deeply by tightening the retainer, as in Utility Model No. 0386889.

Therefore, the rivet bolt is molded separately from the retainer and the bolt. When looking at the structure of the mold for forming the retainer, a plurality of molding grooves are formed in the upper mold and formed into a plurality of molding grooves for forming the head in the lower mold. When a plurality of forming grooves are formed deeply and the upper and lower molds contact each other to form a fully formed molding chamber, the molten synthetic resin is injected into each molding chamber through an injection path formed between the upper and lower contact surfaces. When the mold is formed and the upper mold is raised after the molding, the pin of the lower mold is configured to protrude into the molding chamber by a spring to be demolded.

Therefore, in the process of injecting the synthetic resin, the synthetic resin is injected from the lower inlet in the deep molding chamber of the upper mold, and when the inlet is blocked, no gas or residual air can be discharged thereafter. In this case, it is difficult to obtain a retainer of a perfect shape because the injection amount of the synthetic resin is insufficient (unformed), so that a defect is generated, which leads to a decrease in productivity due to a high defect rate, and to a mold release from a lower mold having a milpin. However, from the upper mold, which is deep in the molding chamber, demoulding cannot be performed properly, and thus, productivity is further reduced as the demolding time is delayed.

The present invention can prevent the occurrence of defects due to the air (heat gas) remaining in the upper mold chamber in consideration of the problems of the prior art described above, and can be made to be demolded smoothly to bring productivity improvement A mold for retainer molding of bolts is provided.

The object of the present invention described above is to have a mill pin in the upper mold so that the mill pin is retracted together with the retraction of the guide pin which protrudes during the lowering of the upper mold to open the molding chamber, and remains through the gap having the mill pin when the molten synthetic resin is injected. It is achieved by the retainer molding mold of the rivet bolt that allows the air to be discharged and the mill pin is protruded by its own weight when demolding by the rise of the upper mold so that the mold can be smoothly demolded.

Figure 1 is a side view of the present invention, the present invention is formed on the lower surface (4) formed side by side so that a plurality of molding chamber (2a) (4a) respectively facing each other on the opposite surface of the upper, lower mold (2) (4) The mill pins 6 of each of the molding chambers 4a are configured to be projected into the molding chamber 4a by a guide pin 8 connected to the support plate 7 and exposed to the spring and its upper surface. Each mold chamber (2a) of the) is configured to have a mill pin 12, which is connected to the lifting plate 10, respectively, and operate together.

The molding chamber 2a of the upper mold 2 is the number corresponding to the number of several extension portions 14b independently protruding from the head portion 14a of the retainer 14, and the pins 12 are also each. It is to be independently in the molding chamber, but is connected to the lifting plate 10 as a whole to operate at the same time and the guide pin 16 is formed to connect to the lifting plate to protrude to the bottom of the upper mold (2) has a lower mold (4) It is configured to face the guide pin (8).

In the present invention, as shown in FIG. 2, when the upper die 2 is raised, the mill pin 6 of the lower die 4 protrudes into the molding chamber 4a by the repulsive force of the spring (not shown), and the upper die 2 has the The mil pin 12 protrudes into the molding chamber 2a by the weight of the elevating plate 10.

When the upper and lower molds 2 and 4 come into contact with the lowering of the upper mold 2 for forming, the guide pin 16 partially protrudes into the bottom of the upper mold 2 is the guide pin 8 of the lower mold 4. Since each of the upper and lower molds (2) and (4) has a mill pin (6) (12) retreat along the guide pins (8) (16), respectively, the molding chamber (2a) (4a) The molding is then performed by allowing molten synthetic resin to be injected into the priming chamber through an injection path formed between the upper and lower contact surfaces.

However, at this time, the deep molding chamber 2a of the upper mold 2 is introduced from the lower inlet, and when the inlet is blocked, the pressure is generated by residual air and gas, but this is a gap between the pin 12 and the upper body. Since it is properly discharged through the molten synthetic resin can be filled in the molding chamber without affecting the gas or air pressure.

When the upper die 2 is raised for demoulding after molding, the mill pin 6 of the lower die 4 protrudes into the forming chamber 4a by a spring, and the mill pin 12 of the upper die 2 is the lifting plate 10. The mold retainer 14 protrudes into the molding chamber 2a by its own weight, thereby demolding the molded retainer 14.

As described above, in the present invention, when the molten synthetic resin is injected, the air remaining in the deep molding chamber 2a of the upper mold 2 is properly discharged through the gap between the pin 12 and the upper body so that the synthetic resin is molded. Since it can be filled in the room, there is no fear of defects caused by insufficient injection amount of synthetic resin, and it can reduce the molding time by rapid demolding by allowing the milling pins (6) (12) to operate smoothly from the upper and lower molds. There is an effect such as to be able to bring productivity improvement.

Claims (1)

In the mold for forming the retainer of the rivet bolt having a deep molding chamber for forming the head portion formed on the lower mold side to form the head portion of the upper and lower molds and spring-actuated milling pins, and forming the expansion portion on the upper mold side, The mill pin 12 connected to the elevating plate 10 is also installed in the deep molding chamber 2a of the upper die 2, and the elevating plate 10 partially protrudes into the bottom of the upper die 2. Retainer molding of the rivet bolt to have a (16), characterized in that the guide pin 16 is configured to face the guide pin (8) of the support plate (7) for connecting the mill pin (6) of the lower mold (4) Mold.

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