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Powder material and machining method for metal injection molding

A metal powder, injection molding technology, used in metal processing equipment, transportation and packaging, etc., can solve the problems of low efficiency of CNC processing methods, unable to meet environmental protection requirements, difficult to produce circulators, etc., to increase corrosion resistance and ductility. , The effect of improving product organization, increasing density and static particle size

Pending Publication Date: 2020-10-16
深圳市泛海统联精密制造股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Manufacturers of existing circulator chambers at home and abroad usually use CNC (computer numerical control machine tool) to process circulators. However, since 5G base stations are more miniaturized than the original 4G and 3G base stations, the size of the circulators used is also smaller
The CNC processing method has low efficiency, high cost, low material utilization rate, and cannot meet environmental protection requirements
And magnetism is an important indicator that affects the stability of circulator signal transmission. Therefore, traditional MIM (Metal Injection Molding) is also difficult to produce qualified circulators due to the limitations of raw materials and processes. New MIM materials and processes

Method used

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  • Powder material and machining method for metal injection molding
  • Powder material and machining method for metal injection molding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Select a nearly spherical iron powder with powder particle size D90<15μm, C content<0.05%, O content<3500ppm, and configure metal powder according to the weight ratio of 87.8% Fe, 10% Ni, 2% Mo and 0.2% P.

[0056] Add binder (5% EVA, 6% HDPE, 3% stearic acid, 1% antioxidant, 85% POM (polyoxymethylene) to the metal powder at a weight ratio of 9:1, of which the antioxidant is B900) , uniformly granulated through a honey mixer to obtain metal powder injection feed.

[0057] Put the granulated metal powder injection feed into the metal powder injection molding machine, inject the metal powder feed into the mold cavity under the conditions of mold temperature 100°C, material temperature 185°C, and injection pressure 60MPa, and then hold the pressure for 2s , cooled for 5s to obtain a green body.

[0058] Put the green body into the degreasing furnace for degreasing. During the degreasing process, the amount of nitric acid added is 2ml / min, and nitrogen gas is filled at 80L...

Embodiment 2

[0066] Select a nearly spherical iron powder with powder particle size D90<15μm, C content<0.05%, O content<3500ppm, and configure metal powder according to the weight ratio of 87.8% Fe, 10% Ni, 2% Mo and 0.2% P.

[0067] Add binder (EVA 5%, HDPE 6%, stearic acid 3%, antioxidant 1%, POM 85% in metal powder with the weight ratio of 9:1, wherein, antioxidant is antioxidant 1010), Uniform granulation through honey mixer to obtain metal powder injection feed.

[0068] Put the granulated metal powder injection feed into the metal powder injection molding machine, inject the metal powder feed into the mold cavity under the conditions of mold temperature 120°C, material temperature 190°C, and injection pressure 100MPa, and then hold the pressure for 3s , cooled for 8s to obtain a green body.

[0069] Put the green body into the degreasing furnace for degreasing. During the degreasing process, the amount of nitric acid added is 3ml / min, and nitrogen gas is filled at 85L / min for flush...

Embodiment 3

[0077] Select a nearly spherical iron powder with powder particle size D90<15μm, C content<0.05%, O content<3500ppm, and configure metal powder according to the weight ratio of 87.8% Fe, 10% Ni, 2% Mo and 0.2% P.

[0078] Add binder (EVA 5%, HDPE 6%, stearic acid 3%, antioxidant 1%, POM 85% to metal powder with the weight ratio of 9:1, wherein, antioxidant is BHT), through honey smelting Machine uniform granulation to obtain metal powder injection feeding.

[0079] Put the granulated metal powder injection feed into the metal powder injection molding machine, inject the metal powder feed into the mold cavity under the conditions of mold temperature 125°C, material temperature 200°C, and injection pressure 150MPa, and then hold the pressure for 4s , cooled for 15s to obtain a green body.

[0080] Put the green body into the degreasing furnace for degreasing. During the degreasing process, the amount of nitric acid added is 4ml / min, and nitrogen gas is filled at 80L / min for was...

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Abstract

The invention discloses a machining method for metal injection molding, and belongs to the technical field of metal machining. The method comprises the following steps: preparing metal powder, whereinthe metal powder comprises the following components in percentage by mass: 87.8% of iron, 10% of nickel, 2% of molybdenum and 0.2% of phosphorus; adding a binder into the prepared metal powder, and carrying out mixing and granulating to obtain a metal powder injection feed; putting the metal powder injection feed into a metal powder injection molding machine to obtain a green body; degreasing thegreen body at the temperature of 100-140 DEG C for 3-5 hours, wherein nitric acid is added at the speed of 2-4 ml / min in the degreasing process, nitrogen is introduced at the speed of 80-90 L / min, and thus a degreased green body is obtained; and sintering the degreased green body at 1200-1350 DEG C, then carrying out cooling to 500-600 DEG C, and carrying out annealing. With the technical scheme,the magnetic permeability of the product can be improved, and the magnetic stability can be improved.

Description

technical field [0001] The invention relates to the technical field of metal processing, in particular to a powder material for metal injection molding and a processing method. Background technique [0002] With the rise, use and promotion of 5G, there has been an upsurge in building 5G base stations around the world. In the process of building a 5G base station, a large number of circulators are required for signal processing. The circulator is a multi-port device that transmits the incident wave entering any port to the next port in sequence according to the direction determined by the static bias magnetic field. In order to ensure good transmission of 5G signals, the circulator has high performance requirements. [0003] Existing circulator cavity manufacturers at home and abroad usually use CNC (Computer Numerical Control Machine Tool) to process circulators. However, since 5G base stations are more miniaturized than the original 4G and 3G base stations, the size of th...

Claims

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Application Information

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IPC IPC(8): B22F3/22B22F1/00B22F3/10C22C38/08C22C38/12
CPCB22F1/0003B22F3/225B22F3/1025C22C38/08C22C38/12C22C38/002B22F1/108B22F1/107
Inventor 严新华杨虎候春伟陈勇
Owner 深圳市泛海统联精密制造股份有限公司
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