Injection molding method of carbon fiber composite

A technology of injection molding and carbon fiber, which is applied in the field of chemical mechanical polishing of wafers, can solve the problems of low wear resistance, inconsistent performance, etc., and achieve the effect of consistent wear, uniform performance and high crystallinity

Inactive Publication Date: 2012-05-30
DALIAN CHUANGDA TECH TRADE MARKET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings of inconsistent performance, low or inconsistent wear resistance, and fusion marks when forming CF/PEEK composite retaining rings by traditional injection molding methods, the present invention discloses an injection molding carbon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0014] Example 1:

[0015] l) The volume of the barrel is twice the volume of the plastic parts and flow channel materials, and it is cleaned by disassembly.

[0016] 2) The mold material is made of martensitic chromium tool steel and is polished with high precision. The film gate is adopted, the gate thickness is lmm and the length is 3mm.

[0017] 3) Dry the raw materials at 150 ℃ for at least 3 hours, without adding recycled materials.

[0018] 4) Inject at a barrel temperature of 385 ℃, the injection pressure is 120 MPa, the mold temperature is 185 ℃, and the temperature and pressure are kept for 30 seconds to form.

Example Embodiment

[0019] Example 2:

[0020] l) The volume of the barrel is twice the volume of the plastic parts and flow channel materials, and it is cleaned by disassembly.

[0021] 2) The mold material is made of martensitic chromium tool steel and is polished with high precision. The film gate is adopted, the gate thickness is lmm and the length is 3mm.

[0022] 3) Dry the raw materials at 150 ℃ for at least 3 hours without adding recycled materials.

[0023] 4) Inject at a barrel temperature of 385 ℃, the injection pressure is 120 MPa, the mold temperature is 185 ℃, and the temperature and pressure are kept for 30 seconds to form.

[0024] 5) The interruption delay time of the production process is 2 hours, and the process continues after increasing the barrel temperature and mold temperature to the requirements of the fourth step.

Example Embodiment

[0025] Example 3:

[0026] l) The volume of the barrel is 5 times the volume of materials such as plastic parts and runners. Use polyetherphthalimide with a melting temperature of 380 ℃ to clean.

[0027] 2) The mold material is made of chrome alloy tool steel, and it is polished with high precision. The film gate is adopted, the gate thickness is 2mm and the length is 4mm.

[0028] 3) Dry the raw materials at 160 ℃ for 2 hours without adding recycled materials.

[0029] 4) Inject at a barrel temperature of 395 ℃, the injection pressure is 140 MPa, the mold temperature is 220 ℃, and the temperature and pressure are kept for 30 seconds to form.

[0030] 5) If the production is interrupted for more than 3 hours, empty the glue cylinder, refill, and restart from the first step.

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Abstract

The invention discloses an injection molding method of a carbon fiber composite; an injection machine is cleaned with the proviso that a material cylinder volume of the injection machine is ensured to be 2-5 times of the material volume of a plastic part and a flow channel; a mold is made of heat-resistant tool steel, and the mold is polished with high precision; gating is performed by a mold type, and the gate has a thickness of 1-2 mm and a length of 3-4 mm; raw materials are dried at 150 DEG C for at least 3 hours, or dried at 160 DEG C for 2 hours, and then are injected at a material cylinder temperature of 385 DEG C-395 DEG C with an injection pressure of 120-140 MPa and a mold temperature of 185-220 DEG C, and molding is completed after heat preservation and pressure preservation for 30 seconds. Retaining rings prepared by the invention has consistent mechanical properties, no molten joint mark, and consistent abrasion resistance.

Description

technical field [0001] The invention belongs to the field of wafer chemical mechanical polishing processing, and in particular relates to a carbon fiber composite injection molding method. Background technique [0002] In wafer chemical mechanical polishing (CMP), due to the inhomogeneity of the force on the wafer surface, it is difficult to achieve the ideal precision on the polished wafer surface, especially the edge of the wafer due to the stress concentration, there will be edge "overgrinding" "Phenomenon, which reduces the quality of wafer polishing and wafer utilization. The larger the diameter of the wafer, the more serious the phenomenon of "overgrinding" on the edge of the wafer. At present, in order to solve the "over-grinding" phenomenon on the edge of the wafer, a retaining ring is added to the periphery of the wafer, which can hold the wafer when the wafer is planarized, determine the position of the wafer, produce a low grinding speed, and at the same time be a...

Claims

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Application Information

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IPC IPC(8): B29C45/76B29C45/27B29B13/06B29K71/00
Inventor 王爽
Owner DALIAN CHUANGDA TECH TRADE MARKET
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