Support-matched large component powder injection molding method

A technology of powder injection molding and parts, applied in the field of powder metallurgy, can solve problems such as deformation, cracks in finished products, failure to form, etc., and achieve the effect of improving the pass rate, consistent shrinkage rate, and improving the quality of finished products

Inactive Publication Date: 2017-11-28
江苏理成科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a powder injection molding method for large-scale parts with support, so as to overcome the problems in the existing production process that the finished product is cracked, deformed or even unable to be molded due to its own weight

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] To prepare a lock with a weight of 900g, mix 90% stainless steel powder by weight and 10% binder by weight evenly, the mixing temperature is 180°C, and the mixing time is 30 minutes. After the mixing is completed, prepare a feed and inject it into a billet Then take the reduced iron powder that is 98.5% by weight, the paraffin wax that is 1% by weight and the aluminum stearate that is 0.5% by weight and press and form it as support under the pressure of 10Mpa, the surface of support and blank The parts are matched to each other. After brushing the separation coating on the support surface, the blank is placed on the support. The shape of the support matches the blank. After sintering for 2 hours, the final product has a density of 99.8% and no cracks.

Embodiment 2

[0027] Prepare a lock with a weight of 600g. Mix Fe2Ni metal powder with a weight of 89% and a binder with a weight of 11% evenly. The mixing temperature is 160°C and the mixing time is 40 minutes. Blank; then take the reduced iron powder that is 98.25% by weight, the paraffin wax that is 1.2% by weight and the aluminum stearate that is 0.55% by weight and press molding under the pressure of 8Mpa to support, the surface of support and The blank is matched to each other. After brushing the separation coating on the support surface, the blank is placed on the support. The support matches the shape of the blank, and the joints are connected to each other. Then they are put into the sintering furnace for degreasing and sintering. After sintering at high temperature for 2 hours, the final product has a density of 99.8% and no cracks.

Embodiment 3

[0029] To prepare the clock case, mix 88% Fe2Ni metal powder by weight and 12% binder by weight evenly, the mixing temperature is 190°C, and the mixing time is 45 minutes. After the mixing is completed, it is prepared as a feed and injection molded into a blank Then take the reduced iron powder that is 98.4% by weight, the paraffin wax that is 1.1% by weight and the aluminum stearate that is 0.5% by weight and press molding under the pressure of 12Mpa to support, the surface of support and blank To match, brush the separation coating on the support surface and place the blank on the support. The support matches the shape of the blank, and the joints are connected to each other. Then they are put into the sintering furnace together for degreasing and sintering. After sintering for 2 hours, the final product has a density of 99.7% and no cracks.

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Abstract

The invention discloses a support-matched large component powder injection molding method. The method comprises the following steps that a, metal powder and a binder are mixed uniformly and then prepared into feed particles; b, an injection molding machine is utilized for injecting the feed particles into a mold to form a blank; c, a support matched with the shape of the blank is pressed and molded, and a separation coating is brushed on the surface of the support; and d, after the blank is put on the surface of the support, the blank and the support are put in a sintering furnace together for degreasing and sintering, and sintering is completed to obtain a finished product. In the sintering step in the injection molding process, the blank is put on the support, the separation coating is brushed between the blank and the support, feed parameters and molding parameters are adjusted, then the blank and the support are sintered together, and it is guaranteed that the shrinking rates of the blank, the separation coating and the support during sintering are consistent; and meanwhile, the blank, the separation coating and the support are combined closely, the shapes are matched, no clearance exists between the blank, the separation coating and the support, no crack is generated to the blank during sintering, and the percent of pass and quality of the finished product are effectively improved.

Description

technical field [0001] The invention relates to the field of powder metallurgy, in particular to a method for powder injection molding of large-scale parts with supports. Background technique [0002] Metal Injection Molding (MIM for short) is a new powder metallurgy molding technology derived from the plastic injection molding industry. As we all know, the production price of plastic injection molding technology is low, and it can produce products with various complex shapes, but the strength of plastic products is not high. In order to improve its performance, the strength and durability of products can be improved by adding metal or ceramic powder to plastic raw materials. Abrasive. In recent years, this idea has been developed to maximize the content of solid particles and completely remove the binder in the subsequent sintering process to densify the formed blank, that is, metal injection molding technology. The basic process steps of metal injection molding are: firs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22B22F3/10
CPCB22F3/10B22F3/225B22F2003/1046B22F2998/10B22F1/10B22F3/1021
Inventor 黄平梁爱民
Owner 江苏理成科技有限公司
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