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Improved powder injection molding shot, product manufactured therefrom, and product manufacturing method

An injection molding and powder technology, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems of reducing the quality of injection molding products, increasing the viscosity of injection materials, and decreasing fluidity, so as to maintain strength and quality, reduce difficulty, The effect of increasing density

Active Publication Date: 2020-12-11
CHENMING MOLD IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the viscosity inversion phenomenon occurs in the high shear strain rate region, the viscosity of the injection material will increase and the fluidity will decrease, resulting in the separation of the binder in the injection material from the metal powder or ceramic powder, thereby reducing the viscosity of the injection molded product. quality
If the high shear strain rate region where the viscosity inversion phenomenon occurs is avoided in order to maintain product quality, the product yield will decrease due to too low shear strain rate

Method used

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  • Improved powder injection molding shot, product manufactured therefrom, and product manufacturing method
  • Improved powder injection molding shot, product manufactured therefrom, and product manufacturing method
  • Improved powder injection molding shot, product manufactured therefrom, and product manufacturing method

Examples

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Effect test

example 1

[0040] Maleic anhydride modified low-density polyethylene, maleic anhydride modified low-density polyethylene, 18302N, the density is 0.912g / cm 3 ), the density is 0.955g / cm 3 high-density polyethylene, polyoxymethylene, stearic acid, paraffin wax and microcrystalline wax at a weight ratio of 2:1, and polyurethane (purchased from Asahi Denka Industry Co., Ltd., model UH-462), with a ratio of about 1: 20:7:2:30:11 weight ratio, uniformly mixed at about 180°C for about 120 minutes to form a binder, and then mixed the above binder with a volume ratio of binder: metal powder of 40:60 Metal powder (Mitsubishi 17-4PH), can obtain the shot material of example 1 of the present invention. The relationship between the viscosity and the shear strain rate of the injection material of Example 1 at 155°C and 190°C is as follows image 3 shown.

example 2

[0042] Maleic anhydride modified low-density polyethylene, maleic anhydride modified low-density polyethylene, 18302N, the density is 0.912g / cm 3 ), the density is 0.955g / cm 3 High-density polyethylene, polyoxymethylene, stearic acid, paraffin wax, and carnauba wax, in a weight ratio of about 1:20:7:2:20:11, were uniformly mixed at about 180°C for about 120 minutes to form a bond agent, and then mix the above-mentioned binder and metal powder (Mitsubishi 17-4PH) at a volume ratio of binder: metal powder of 40:60 to obtain the shot of Example 2 of the present invention. The relationship between the viscosity and the shear strain rate of the shot material of Example 2 at 155°C and 190°C is as follows Figure 4 shown.

example 3

[0044] Maleic anhydride modified low-density polyethylene, maleic anhydride modified low-density polyethylene, 18302N, the density is 0.912g / cm 3 ), the density is 0.955g / cm 3 High-density polyethylene, polyoxymethylene, stearic acid, paraffin wax and microcrystalline wax with a weight ratio of 2:1, and diallyl phthalate prepolymer (purchased from Japan Dasao Co., Ltd., model DAISO DAP-A), with a weight ratio of about 1:10:3:1:15:6, uniformly mixed at about 180°C for about 120 minutes to form a binder, and then use a binder:metal powder ratio of 40:60 The volume ratio of the above binder and metal powder (Mitsubishi 17-4PH) is mixed to obtain the shot material of Example 3 of the present invention. The relationship between the viscosity and the shear strain rate of the shot material of Example 3 at 155°C and 190°C is as follows Figure 5 shown.

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Abstract

The invention provides an improved powder injection molding shot, its manufactured product and product manufacturing method, wherein the improved powder injection molding shot includes: sinterable powder and a binder, the binder includes a hydrocarbon wax, a surfactant, Polyolefin compounds, polyoxymethylene, and rheology modifiers. The powder injection molding shot of the present invention contains a rheological modifier to reduce the powder injection molding shot from becoming an expansion fluid in the high shear strain rate (high shear rate) region, thereby maintaining a high injection rate. In the case of speed, increase the quality of the product.

Description

technical field [0001] The present invention relates to an improved powder injection molding shot, and more specifically, to an improved rheological behavior obtained by using the PIM injection molding shot improvement method of modifying an expansive fluid into a pseudoplastic fluid. A powder injection molding shot, a product made using it, and a method for manufacturing the product. Background technique [0002] Powder injection molding is a part manufacturing technology that combines plastic injection molding and powder technology, which can be divided into metal powder injection molding (Metal Injection Molding, MIM) and ceramic powder injection molding (Ceramic Injection Molding, CIM) These technologies have the advantages of good surface condition, fast molding cycle, high precision and uniform quality, suitable for mass production of complex shapes and can reduce subsequent processing, etc., so they are widely valued by the industry. The basic steps of powder injecti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/22B22F3/10B22F1/00
CPCB22F3/1021B22F3/225B22F1/103B22F1/10
Inventor 谢曙旭
Owner CHENMING MOLD IND CORP
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