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Die pressing and forming method for polytetrafluoroethylene thin wall crustose products flexible die

A polytetrafluoroethylene and compression molding technology, applied in the field of soft molding, can solve the problems of difficult conditions, leakage of sealed bags, contamination of products, complicated production equipment and processes, etc., and achieves high production efficiency, uniform internal quality, and product quality The effect of quality and yield improvement

Active Publication Date: 2004-11-10
中国航天科技集团公司第一研究院第七〇三研究所
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Problems solved by technology

The PTFE products formed by hydraulic method are uniformly compressed, stable in size and good in quality, but require autoclave or high-pressure pump, high-pressure sealed bag and pressure transmission medium, and it is easy for the sealed bag to leak and pollute the product, and the production equipment and process are complicated , the general condition is difficult to achieve

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  • Die pressing and forming method for polytetrafluoroethylene thin wall crustose products flexible die
  • Die pressing and forming method for polytetrafluoroethylene thin wall crustose products flexible die
  • Die pressing and forming method for polytetrafluoroethylene thin wall crustose products flexible die

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with accompanying drawing:

[0025] Such as Figure 1 to Figure 6 Shown is the first embodiment of the present invention---external pressure method, and concrete steps are as follows: (1) design and manufacture rigid mould, charging frock and appropriate thickness according to product size and the shrinkage rate of polytetrafluoroethylene (PTFE) The rubber or elastomer soft mold 1, the rigid mold includes product forming male mold 2, soft mold forming male mold 3, guide ring 4 and female mold 5, and the charging tooling includes charging core 6 and uniformly distributed 120° Three mold core positioning blocks 7; (2) according to product base thickness: base material ≈ 1: 5 (compression ratio) paving PTFE base material 8, three mold core positioning blocks 7-1, 7-2, 7-3 Place it on the guide ring 4 at 120°, put the charging core 6 in the center formed by them and touch the PTFE base material 8, and then...

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Abstract

The invention is a soft mode die forming method of teflon thin-wall shell product, using a definitely elastic soft mode to regulate and transfer molding pressure between a rigid mould and teflon powder, thus able to primely remedy inevitable nonuniformity during charging materials of teflon special-shaped pieces, overcoming the defect in molding teflon thin-wall shell products, radically improving product quality and yield, and unnecessary to add any new devices, liquid mediums and sealing bags.

Description

technical field [0001] The invention relates to a soft mold compression molding method, in particular to a soft mold compression molding method for polytetrafluoroethylene (abbreviated as PTFE) thin-wall shell-shaped products. Background technique [0002] At present, the common compression molding method for polytetrafluoroethylene thin-walled shell-shaped products is to pour polytetrafluoroethylene molding powder into a rigid cavity for compression. The size of the rigid cavity is usually designed according to the size of the product and the compression ratio of the material, but complex products bring great difficulties to the cavity design and loading process. Due to the poor fluidity of the material, the uniformity of the pressure distribution during the pressing process cannot be adjusted by the flow of the material, but can only be guaranteed by the uniformity of the charge. Therefore, the conventional molding method cannot adjust the pressure distribution and size of...

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Application Information

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IPC IPC(8): B29C43/12B29C67/04
Inventor 姜卫陵郦江涛罗苹李德利
Owner 中国航天科技集团公司第一研究院第七〇三研究所
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