Powder metallurgy injection molding process

An injection molding and powder metallurgy technology, applied in the field of powder metallurgy, can solve the problems of uneven stirring and poor product stability, and achieve the effect of reducing the amount of cutting, uniform distribution, and improving labor productivity.

Inactive Publication Date: 2013-03-13
LANZHOU JINHAO MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the defects of uneven stirring and poor product stability in the prior art, and provide a pulsating periodic vibration mixing method, which solves the weaknesses of raw material fluidity and poor mixing type in the injection molding process , high product density, uniform distribution

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  • Powder metallurgy injection molding process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Such as figure 1 As shown, a powder metallurgy injection molding process, the steps are as follows: 1. Metal powder and binder are mixed evenly, wherein the metal powder accounts for 70% of the weight of the mixed material, and the binder mainly contains the following components by weight: paraffin wax 35, polypropylene 10, zinc stearate 7.5, high-density polyethylene 37.5, graphite 10.

[0019] 2. Make the designed product into a mold; 3. Feed the material, first put the metal powder and binder that meet the particle size requirements (the relative density of the particles required in this embodiment is 95-99%) into the final product 4. Injection molding, that is, heating to 130°C under the protection of ammonia gas and then warm pressing. During the process, the screw of the injection machine is in a state of vibration at the same cycle. , The molds are connected in turn to make the screw vibrate in the circumferential direction in the barrel. 5. Degrease, heat the ...

Embodiment 2

[0023] Such as figure 1 As shown, a powder metallurgy injection molding process, the steps are as follows: 1. Metal powder and binder are mixed evenly, wherein the metal powder accounts for 60% of the weight of the mixed material, and the binder mainly consists of the following components by weight: Paraffin wax 30, polypropylene 12, stearic acid 5, high-density polyethylene 45; 2, carry out mold manufacturing with the product designed; The relative density is 95-99%) and the binder is put into the mold cavity with the shape of the final product; 4. Injection molding, that is, heating to 120°C under the protection of ammonia gas and then warm pressing. The screw of the injection machine is in the state of vibration of the same period. The method of use is to connect the motor, vibrator and mold in sequence to make the screw vibrate in the circumferential direction in the barrel. 5. Degrease and clean the paraffin in the binder. 6. Sintering, sintering is carried out in a vac...

Embodiment 3

[0026] Such as figure 1 As shown, a powder metallurgy injection molding process, the steps are as follows: 1. Metal powder and binder are mixed, wherein the metal powder accounts for 80% of the weight of the mixed material, and the binder mainly consists of the following components by weight: paraffin wax 40 , polypropylene 8, zinc stearate 10, high-density polyethylene 30, graphite 10. 2. Make molds for the designed products; 3. Feeding, first mix metal powder and binder that meet the particle size requirements The homogeneous material (the relative density of the particles required in this example is 95-99%) is put into the mold cavity with the shape of the final product; 4. Injection molding, that is, heating to 140°C under the protection of ammonia gas and then warm pressing molding , In the process, the screw of the injection machine is in the same cycle vibration state. The method of use is to connect the motor, vibrator and mold in sequence, so that the screw vibrates i...

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Abstract

The invention provides a powder metallurgy injection molding process, belonging to the technical field of powder metallurgy. The powder metallurgy injection molding process comprises the following steps of: 1), mixing metal powder and a bonding agent according to a ratio; 2), feeding: putting a mixture of the metal powder and the bonding agent into a pre-designed and manufactured mould cavity; heating to 120-140 DEG C under the protection of ammonia gas to carry out warm pressing molding; and in a molding process, vibrating the mould cavity; 3), degreasing: after de-molding, heating a molded product to 250-300 DEG C; and 4), sintering: sintering at a vacuum state, wherein the sintering temperature is 850-1000 DEG C and the heat-preservation time is 1-2.5 hours. The invention provides a pulse periodic vibration mixing method aiming to solve the technical problems of defects of the prior art that the agitation is not uniform and the product stability is poor; and the disadvantages of poor mobility and mixing performance of raw materials in an injection molding process are overcome, the product density is high and the distribution is uniform.

Description

technical field [0001] The invention relates to a powder metallurgy injection molding process, which belongs to the technical field of powder metallurgy. Background technique [0002] Powder metallurgy injection molding (linjection moulding, referred to as MIM) is a new manufacturing process technology that combines powder metallurgy and plastic injection molding. This process is suitable for mass production of small precision metal parts with complex three-dimensional shapes and special performance requirements. The sintered product not only has the same complex shape and high precision as the product obtained by plastic injection molding, but also has the physical, chemical and mechanical properties close to the forged part. It can produce most refractory metals and their compounds, porous materials, it has fewer blanks than casting process products, and does not require or seldom require subsequent machining, so it can greatly save metal materials and reduce product costs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22
Inventor 付占忠
Owner LANZHOU JINHAO MACHINERY MFG
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