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MIM manufacturing process for non-magnetic 17-4P stainless steel parts

A manufacturing process, stainless steel technology, applied in the field of MIM manufacturing process, MIM manufacturing process of non-magnetic 17-4PH stainless steel parts, can solve the problems of low density, poor corrosion resistance and strength, low strength and hardness, and achieve tensile strength. And the effect of high yield and good corrosion resistance

Inactive Publication Date: 2016-05-04
SHANGHAI FUTURE HIGH-TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 17-4PH precipitation hardening stainless steel, 316L stainless steel and 304L stainless steel are several types of stainless steel materials commonly used in metal powder injection molding (MIM for short). 17-4PH precipitation hardening stainless steel has high strength, good corrosion resistance, and magnetic properties. Structural parts without requirements; 316L and 304L stainless steel have good corrosion resistance and no magnetism, but their strength and hardness are lower than 17-4PH, especially the yield strength is very low; they meet the requirements of tensile strength, high yield strength and good corrosion resistance. Non-magnetic materials are generally high-nitrogen stainless steel, and 17-4PH and 316L solid solution nitrogen can also be used to improve material properties, but low density, poor corrosion resistance and strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Manufacture of non-magnetic 17-4PH stainless steel injection powder:

[0018] (1), 17-4PH stainless steel powder with a diameter of 7 microns and 8% binder by total weight are placed in a kneader, and mixed for 40 minutes at a temperature range of 175 ° C;

[0019] (2), after the mixture prepared in the step (1) is cooled to room temperature, it is broken with a crusher, and the broken material is extruded and granulated at 160 ° C in an injection machine, which is convenient for injection molding;

[0020] (3), injection molding: process the feed prepared in step (2) into a blank in an injection molding machine at 160°C, injection pressure 60Mpa, and mold temperature 70°C;

[0021] (4) Place the blank processed in step (3) in a catalytic degreasing furnace at 110°C for catalytic degreasing for 2 hours, and remove the polyoxymethylene in the injection blank;

[0022] (5) Put the blank that has been catalyzed and degreased in step (4) into a vacuum furnace fo...

Embodiment 2

[0025] (1), 17-4PH stainless steel powder with a diameter of 9 microns and 11% binder by total weight are placed in a kneader, and mixed for 120 minutes at a temperature range of 195° C.;

[0026] (2), after the mixture prepared in the step (1) is cooled to room temperature, it is crushed with a crusher, and the crushed material is extruded and granulated at 180 ° C in an injection machine, which is convenient for injection molding;

[0027] (3), injection molding: process the feed prepared in step (2) into a blank in an injection molding machine at 180°C, injection pressure 100Mpa, and mold temperature 100°C;

[0028] (4) Place the blank processed in the step (3) in a catalytic degreasing furnace at 110°C for catalytic degreasing for 4 hours, and remove the polyoxymethylene in the injection blank;

[0029] (5) Put the blank that has been catalyzed and degreased in step (4) into a vacuum furnace for degreasing and sintering. The sintering process is: heating from room temperat...

Embodiment 3

[0032] (1), 17-4PH stainless steel powder with a diameter of 10 microns and 11% of the total weight of the binder are placed in a kneader, and mixed for 120 minutes at a temperature range of 195 ° C;

[0033] (2), after the mixture prepared in step (1) is cooled to room temperature, it is crushed with a crusher, and the crushed material is extruded and granulated at 190 ° C in an injection machine, which is convenient for injection molding;

[0034] (3), injection molding: process the feed prepared in step (2) into a blank in an injection molding machine at 210°C, injection pressure 140Mpa, and mold temperature 150°C;

[0035] (4) Place the blank processed in the step (3) in a catalytic degreasing furnace at 140°C for catalytic degreasing for 4 hours, and remove the polyoxymethylene in the injection blank;

[0036] (5) Put the blank that has been catalyzed and degreased in step (4) into a vacuum furnace for degreasing and sintering. The sintering process is: heating from room ...

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Abstract

The invention discloses an MIM manufacturing process for non-magnetic 17-4P stainless steel parts. The MIM manufacturing process comprises the following steps: putting a 17-4PH stainless steel powder and a binder into a kneading machine for mixing; cooling to a room temperature and then crushing by using a crusher, and then extruding a crushed material for pelletizing in an injection molding machine; processing a prepared feeding material in the injection molding machine into blanks; then catalyzing, debinding and removing polyformaldehyde from the injection blanks in a catalytic debinding furnace; putting well catalyzed and debound blanks into a vacuum furnace for debinding and sintering; and carrying out solution treatment on well sintered parts in a shielding gas protected continuous furnace or the vacuum furnace. The MIM manufacturing process provided by the invention adopts an MIM process and uses a 17-4PH powder sintered through nitrogen, and then the non-magnetic MIM metal parts with good compactness and corrosion resistance, and high tensile strength and yield can be obtained after solution treatment.

Description

technical field [0001] The invention discloses a MIM manufacturing process, in particular to a MIM manufacturing process of non-magnetic 17-4PH stainless steel parts. The invention belongs to the technical field of metal injection molding. Background technique [0002] Metal injection molding (Metalinjection Molding, MIM) is a molding method that injects a plasticized mixture of metal powder and its binder into a model. It is the shape required by first mixing the selected powder with a binder, then granulating the mixture and then injection molding. The polymer imparts its viscous flow characteristics to the compound, which aids in forming, cavity filling and uniformity of powder loading. After forming, the binder is removed, and then the degreased body is sintered. Some sintered products may require further densification, heat treatment or machining. Sintered products not only have the same complex shape and high precision as products obtained by plastic injection mold...

Claims

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Application Information

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IPC IPC(8): B22F3/22B22F3/10B22F3/24
CPCB22F3/225B22F3/1007B22F3/24B22F2003/248B22F2201/02
Inventor 段满堂
Owner SHANGHAI FUTURE HIGH-TECH CO LTD
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