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An injection molding process for eyeglass parts

A technology for components and glasses, applied in the field of glasses, can solve the problems of low injection molding accuracy and high defective product rate, and achieve the effects of simple and convenient positioning, high yield rate and high precision

Active Publication Date: 2019-07-26
广东凯岚光学科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the stress formed during high-pressure injection of plastic and the inconsistent thermal shrinkage ratio of plastic and metal, the metal will separate from the plastic after injection molding, and a mark similar to watercolor patterns will be formed inside, resulting in low injection molding accuracy and a high rate of defective products.

Method used

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  • An injection molding process for eyeglass parts
  • An injection molding process for eyeglass parts
  • An injection molding process for eyeglass parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as Figure 1 to Figure 5 A schematic structural view of the mold used in the present invention is shown.

[0033] This mold comprises metal mold 1 and silica gel mold 2, and metal mold 1 comprises first fixed mold part 11 and first movable mold part 12, and silicone mold 2 comprises second fixed mold part 21 and second movable mold part 22, and the second fixed mold part The mold part 21 is fixedly connected with the first fixed mold part 11, and the second movable mold part 22 is fixedly connected with the first movable mold part 12. After covering, a mold is formed between the second fixed mold part 21 and the second movable mold part 22. The mold cavity, the first fixed mold part 11 and the first movable mold part 12 are fixedly connected by two guide pillars 3, and the two guide pillars 3 are respectively arranged at diagonal positions of the first fixed mold part 11. The second fixed mold part 21 is provided with a main channel 23 , and the second movable mol...

Embodiment 2

[0046] The difference from Example 1 is that in the first step, the shrinkage of the silica gel is amplified by 1.5% on the metal mold in advance; in the third step, the epoxy resin at 22° C. is poured from the gate at normal pressure.

[0047] In parts by weight, the silica gel in the first step includes the following components:

[0048]

[0049] The preparation method of the silica gel is as follows: put the silica gel raw material, vulcanizing agent, silicon micropowder and short glass fiber into a silica gel mixer and knead together to obtain a well-kneaded silica gel mixture, put the silica gel mixture into the mold, pass through the plate The silicone mold is made after heating and vulcanizing by the vulcanizing machine.

[0050] The average particle size of silica powder is 1μm, and the specific surface area is 26m2 / g.

[0051] The spectacle part is a spectacle frame, and the shape of the cavity is also different from that of embodiment 1 because the spectacle fram...

Embodiment 3

[0054] The difference from Example 1 is that in the first step, the shrinkage of the silica gel is amplified by 2.5% on the metal mold in advance; in the third step, the epoxy resin at 28° C. is poured from the gate at normal pressure.

[0055] In parts by weight, the silica gel in the first step includes the following components:

[0056]

[0057] The preparation method of the silica gel is as follows: put the silica gel raw material, vulcanizing agent, silicon micropowder and short glass fiber into a silica gel mixer and knead together to obtain a well-kneaded silica gel mixture, put the silica gel mixture into the mold, pass through the plate The silicone mold is made after heating and vulcanizing by the vulcanizing machine.

[0058] The average particle size of silica powder is 2μm, and the specific surface area is 24m 2 / g.

[0059] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of eyeglasses and particularly relates to an injection molding technology for an eyeglass part. The injection molding technology at least comprises the following steps that a metal die is used for pressing silica gel to form a silica gel die; a front half section of a metal part of the eyeglass part is placed into a cavity of a fixed die part of the silica gel die, epoxy resin is poured from a sprue, and the epoxy resin flows into the cavity from a runner and is wrapped on the front half section of the metal part; and a rear half section of the metal part is placed in the cavity of the fixed die part of the silica gel die again, epoxy resin is poured from the sprue, the epoxy resin flows into the cavity from the runner and is wrapped on the rearhalf section of the metal part, and the epoxy resin is wrapped by the metla part. Compared with the prior art, the precision of a silica gel product begins to be taken into consideration from designof the metal die, the product precision is further improved from the angle of controlling over silica gel thermal expansion, a two-time segmented injection molding technology is adopted in the aspectof metal assembling and positioning, the installation precision is further improved, and the installation speed is increased.

Description

technical field [0001] The invention belongs to the technical field of eyeglasses, in particular to an injection molding process for eyeglass parts. Background technique [0002] In the traditional injection molding process, the injection temperature is relatively high, generally above 100°C, so only simple electroplated metal can be injected into the plastic body. When making glasses legs, the specific process is: first place the metal in the mold cavity, then heat the plastic and inject it into the mold cavity under high pressure, so that the plastic wraps around the metal to form the glasses legs. However, due to the stress formed during high-pressure injection of plastic and the inconsistent thermal shrinkage ratio of plastic and metal, the metal will separate from the plastic after injection molding, forming a mark similar to watercolor patterns inside, resulting in low injection molding accuracy and high defective product rate. [0003] In view of this, it is necessar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C39/10B29C39/26B29C39/44B29C33/38C08L83/04C08K7/14C08K3/34
CPCB29C33/3842B29C39/10B29C39/26B29C39/44C08K3/34C08K7/14C08L83/04
Inventor 李成龙唐仲平
Owner 广东凯岚光学科技有限公司