Powder injection molding technology for producing micro-size hinged parts

A technology of powder injection molding and injection molding, which is applied in the field of powder injection molding technology, can solve problems such as the inability to guarantee the overall strength of the mechanism, increase the connection volume, and difficulty in assembling parts, and achieve large production batches, lower overall costs, and simple production processes. Effect

Inactive Publication Date: 2014-10-29
CHANGSHA UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of social science and technology, the development of micro-electro-mechanical systems requires more and more micro-sized components for hinge joints, but how to produce micro-sized powder injection molded hinge joints without increasing the volume and ensuring joint strength? Parts have always been a technical bottleneck that is difficult to overcome
If the traditional joint parts are produced separately, and then connected with micro-bolts or hinges, it not only increases the volume of the joint, but also cannot guarantee the overall strength of the mechanism due to the increase in the number of parts and the consideration of installing the joint system or assembling the joint system. National standard ultra-fine bolts and nuts also greatly increase the cost
[0003] Since the size of the connection structure of powder injection molding products is often less than 1mm, and some are even only a few hundred microns, this brings great difficulties to the assembly of parts

Method used

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  • Powder injection molding technology for producing micro-size hinged parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: 316L stainless steel powder is used to feed and inject two metal parts connected by a hinge.

[0018] (1) The powder feed adopts stainless steel 316L with an average particle diameter of 22um from BASF, with a melting temperature of 190°C, a mold temperature of 140°C, a holding pressure of 300bar, an injection speed of 250mm / s, and a cooling time of 10s. Injection molding is performed by the injection process. The injection molding machine can use the Microsystem 50 micro-injection molding machine of Battenfeld Company to obtain the injection base of the first part. After the injection base is taken out from the mold, the gating system is cut off with a knife.

[0019] (2) Overmolding is used for secondary molding, and polyoxymethylene (POM) is injected with a melting temperature of 190°C, a mold temperature of 100°C, a holding pressure of 300bar, an injection speed of 250mm / s, and a cooling time of 10s. To the cavity containing the injection base of the fir...

Embodiment 2

[0023] Example 2: Two ceramic parts connected by a hinge are formed by feeding injection with zirconia ceramic powder.

[0024] (1) The powder adopts zirconia powder particles with an average particle diameter of 7um, and the binder adopts an oil-based binder. First, add the binder into the internal mixer to heat and melt, then add zirconia powder particles, the loading amount is 55%, mix for 150 minutes, and the mixing temperature is 160°C. Use an extruder to extrude sheets three times and extrude strips three times. The extrusion temperatures are 120°C, 135°C, and 130°C respectively, and the rotation speed is 800r / min to obtain strip-shaped feed.

[0025] (2) Injection molding is then performed at an injection process with a melting temperature of 160°C, a mold temperature of 60°C, a holding pressure of 200bar, an injection speed of 250mm / s, and a cooling time of 10s. The injection molding machine can use the Microsystem 50 micro-injection molding machine of Battenfeld Comp...

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Abstract

The invention relates to a powder injection molding technology for producing micro-size hinged parts. According to the technology, a polymer cladding layer which can be catalytically decomposed is formed in an injection molding mode on the surface of the first injection molding part or the interface of the first part and the second part which are hinged by adopting a first rubber coating mold, injection molding is performed again on a mold cavity containing an injection blank through a second rubber coating mold, powder of the second part is fed in an injected mode, an interlayer part set with a middle polymer capable of being catalytically decomposed is finally obtained, and no contact point exists between the first part and the second part. The middle polymer cladding layer which can be catalytically decomposed is completely removed in the following-up degreasing stage, a gap where the first part and the second part move relatively is formed, and therefore the inseparable hinged parts with the size controllable are manufactured. The technology is simple in production process, it is avoided that a linkage system is assembled additionally, overall cost is reduced, production efficiency is high, and the powder injection molding technology can be widely used in the fields of production of micro electro mechanical system, manufacturing of medical instruments and artificial limbs and the like.

Description

technical field [0001] The invention relates to a powder injection molding process for producing micro-sized hinged parts. Background technique [0002] Powder injection molding is a new near-net-shaping technology developed on the basis of plastic injection molding. It is suitable for batch production of metal or ceramic parts with complex geometry, small size and excellent performance. With the development of social science and technology, the development of micro-electro-mechanical systems requires more and more micro-sized components for hinge joints, but how to produce micro-sized powder injection molded hinge joints without increasing the volume and ensuring joint strength? Parts have always been a technical bottleneck that is difficult to overcome. If the traditional joint parts are produced separately, and then connected with micro-bolts or hinges, it not only increases the volume of the joint, but also cannot guarantee the overall strength of the mechanism due to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22B28B1/24
Inventor 刘煜夏卿坤谢邵辉梁亮高全芹何航敏江峻肖燕芳
Owner CHANGSHA UNIVERSITY
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