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Method for producing low-pressure oil injection nozzle of automobile by using MIM (metal injection moulding) technique

A fuel injector and automobile technology, applied in the field of parts processing, can solve the problems of high material loss, high manufacturing cost, and low efficiency of parts, and achieve the effects of increased production efficiency, high manufacturing cost, and low efficiency

Inactive Publication Date: 2017-08-18
SHANGHAI FUTURE HIGH-TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention discloses a method for producing low-pressure fuel injectors for automobiles using MIM technology to solve the problems of high part material loss, high energy consumption, low efficiency and high manufacturing cost in the existing production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) By weight percentage, weigh the following raw materials: 17-4PH powder 90%, resin-based multi-component binder 0%;

[0026] (2) Feeding: Use a mold to inject a blank into a plastic injection molding machine, wherein, mold temperature: 110°C, material temperature: 190°C, injection pressure 0.8Bar;

[0027] (3) Degreasing: Use high temperature to remove most of the organic substances in the injection billet under the protection of the atmosphere. Among them, the degreasing temperature is 130°C, and the degreasing protective atmosphere is NH 3 , the degreasing time is 3 hours;

[0028] (4) Sintering: Sinter in a batch vacuum furnace under a hydrogen protective atmosphere to form the final part state; use an ordinary batch vacuum sintering furnace, sintering protective atmosphere: Ar 2 , the highest sintering temperature is 1300°C; the entire sintering cycle is 20-22 hours;

[0029] (5) Assembling: Use a jig to press the insert into the fuel injector to complete the a...

Embodiment 2

[0032] (1) By weight percentage, weigh the following raw materials: 17-4PH powder 95%, resin-based multi-component binder 5%;

[0033] (2) Feeding: Use a mold to inject a blank into a plastic injection molding machine, wherein, mold temperature: 110°C, material temperature: 210°C, injection pressure 0.9Bar;

[0034] (3) Degreasing: Use high temperature to remove most of the organic substances in the injection billet under the protection of the atmosphere. Among them, the degreasing temperature is 130°C, and the degreasing protective atmosphere is NH 3 , the degreasing time is 5 hours;

[0035] (4) Sintering: Sinter in a batch vacuum furnace under a hydrogen protective atmosphere to form the final part state; use an ordinary batch vacuum sintering furnace, sintering protective atmosphere: Ar 2 , the highest sintering temperature is 1300°C; the entire sintering cycle is 20-22 hours;

[0036] (5) Assembling: Use a jig to press the insert into the fuel injector to complete the a...

Embodiment 3

[0039] (1) By weight percentage, weigh the following raw materials: 17-4PH powder 90-95%, resin-based multi-component binder 5-10%;

[0040] (2) Feeding: Use a mold to inject a blank into a plastic injection molding machine, wherein, mold temperature: 100°C, material temperature: 200°C, injection pressure 0.7Bar;

[0041] (3) Degreasing: Use high temperature to remove most of the organic substances in the injection billet under the protection of the atmosphere. Among them, the degreasing temperature is 130°C, and the degreasing protective atmosphere is NH 3 , the degreasing time is 4 hours;

[0042] (4) Sintering: Sinter in a batch vacuum furnace under a hydrogen protective atmosphere to form the final part state; use an ordinary batch vacuum sintering furnace, sintering protective atmosphere: Ar 2 , the highest sintering temperature is 1300°C; the entire sintering cycle is 20-22 hours;

[0043] (5) Assembling: Use a jig to press the insert into the fuel injector to complete...

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PUM

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Abstract

The invention discloses a method for producing a low-pressure oil injection nozzle of an automobile by using an MIM (metal injection moulding) technique. The method comprises the following steps of (1) weighing the following raw materials according to weight percent: 90 to 95% of 430 stainless steel powder and 5 to 10% of resin-based multi-component adhesives; injecting into blanks on a plastic injection moulding machine by using a die, wherein the temperature of the die is 90 to 110 DEG C, the temperature of the materials is 180 to 210 DEG C, and the injection pressure is 0.7 to 0.9 Bar; removing most organic substances from injected blanks under the protection of atmosphere by utilizing high temperature, wherein the derosination temperature is 130 DEG C, the derosination protection atmosphere is NH3, and the derosination time is 3 to 5 hours; sintering into the final part state in an intermittent vacuum furnace at the protective atmosphere of hydrogen, wherein the intermittent vacuum furnace is a common intermittent vacuum sintering furnace, the sintering protection atmosphere is Ar2, the highest sintering temperature is 1300 DEG C, and the whole sintering cycle is 20 to 22 hours; and pressing an insert into the oil injection nozzle by using a jig so as to complete assembly. According to the method, the MIM technique is adopted, so that the production efficiency is improved, the batch cost is only 50% of that of a traditional technique, no material is wasted in the whole production process, and the dimensional accuracy fully satisfies drawing requirements.

Description

technical field [0001] The patent of the present invention relates to a method for processing parts, specifically, using MIM (Metal Powder Injection Molding) method to produce low-pressure fuel injectors for automobiles Background technique [0002] The traditional manufacturing method of low-pressure fuel injectors for automobiles is generally to decompose the fuel injector into two structural parts, which are processed by CNC respectively, and then welded into the fuel injector assembly by welding the two structural parts. The traditional manufacturing method has high material loss, High energy consumption, low efficiency, high manufacturing costs and other disadvantages, and the use of MIM (metal powder injection molding) technology can be integrated into the injection nozzle assembly, saving machining, welding and other processes, can achieve 100% utilization of materials, with a processing cycle Short, low energy consumption, safe and pollution-free manufacturing proces...

Claims

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Application Information

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IPC IPC(8): B22F3/115B22F5/10
CPCB22F3/115B22F5/10
Inventor 唐飞
Owner SHANGHAI FUTURE HIGH-TECH CO LTD
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