Method for manufacturing outer shuttle of rotating shuttle by injection molding

A technology of injection molding and manufacturing method, which is applied in the field of sewing machine accessories, can solve the problems of low utilization rate of metal materials, cumbersome manufacturing and processing procedures, and inability to produce on a large scale, so as to achieve good sintering shrinkage consistency, high utilization rate of metal materials, and eliminate The effect of compositional segregation

Active Publication Date: 2013-02-27
ZHEJIANG YIHUO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The outer shuttle has a complex structure and is finely made
The existing production methods are generally produced by cold extrusion and turning and milling mechanical processing methods.

Method used

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  • Method for manufacturing outer shuttle of rotating shuttle by injection molding
  • Method for manufacturing outer shuttle of rotating shuttle by injection molding
  • Method for manufacturing outer shuttle of rotating shuttle by injection molding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The alloy material is Fe2NiMo, and its raw material composition is: 2% carbonyl nickel powder, 0.25% Mo powder, the remaining powder is carbonyl iron powder, and the particle size of the raw material is 0.5-80 microns. First, the alloy powder is mixed without segregation, and then the alloy powder is placed in a furnace for alloying treatment under a protective atmosphere. The treatment temperature is 200~800℃, and the alloying time is 0.2~6 hours. The alloying treatment adopts a vacuum furnace, a continuous furnace or a batch furnace with a protective gas (inert gas, reducing gas). After alloying, the powder is milled and sieved. The particle size of the raw material alloy powder obtained after grinding and sieving is 0.5-80 microns. Then the raw material alloy powder is prepared for feeding, and then the feeding is injection molded; after molding, the outer shuttle of the rotary hook is sintered.

[0039] The comparative example of embodiment 1 is injected with the ...

Embodiment 2

[0041] The alloy material is FeCrMo, and its raw material composition is: 1% Cr powder, 0.25% Mo powder, and the rest is carbonyl iron powder, and the raw material particle size is 0.5-80 microns. Firstly, segregation-free mixing is carried out, and then the raw material alloy powder is placed in a furnace for alloying treatment under a protective atmosphere. The treatment temperature is 200~800℃, and the alloying time is 0.2~6 hours. After alloying, the powder is milled and sieved. The particle size of the raw material alloy powder obtained after grinding and sieving is 0.5-80 microns. Then the raw material alloy powder is prepared for feeding, and then the feeding is injection molded; after molding, the outer shuttle of the rotary hook is sintered.

[0042] The comparative example of embodiment 2, the atomized 20Cr material of equal particle size is injected; Under the same condition, after sintering, Fe2Ni material material size one-time pass rate is 92%, 20Cr material, o...

Embodiment 3

[0044] The alloy material is FeCr, and its raw material composition is: 1% Cr powder, the rest is carbonyl iron powder, and the particle size of the raw material is 0.5-80 microns. Firstly, segregation-free mixing is carried out, and then the raw material alloy powder is placed in a furnace for alloying treatment under a protective atmosphere. The alloying treatment temperature is 200~800℃, and the alloying time is 0.2~6 hours. After alloying, the powder is milled and sieved. The particle size of the raw material alloy powder obtained after grinding and sieving is 0.5-80 microns. Then the raw material alloy powder is prepared for feeding, and then the feeding is injection molded; after molding, the outer shuttle of the rotary hook is sintered.

[0045] In the comparative example of embodiment 3, the atomized 20Cr material of the same particle size is injected; under the same conditions, after sintering, the first pass rate of FeCr material size is 90.2%, and the first pass r...

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Abstract

The invention discloses a method for manufacturing an outer shuttle of a rotating shuttle by injection molding. The outer shuttle of the rotating shuttle is made of alloy materials including Fe2Ni, Mo, FeCrMo or FeCr. The method for manufacturing the outer shuttle of the rotating shuttle includes the steps: (1) mixing raw alloy powder in a segregation-free manner; (2) alloying the raw alloy powder; (3) screening the raw alloy powder; (4) preparing feed with the raw alloy powder; (5) performing injection molding of the feed; (6) sintering the molded outer shuttle of the rotating shuttle; (7) shaping the surface of the outer shuttle to reach needed size; and (8) performing sand blasting or polishing for the surface of the outer shuttle. The Fe2Ni, the Mo, the FeCrMo or the FeCr is used as raw materials, composition segregation and unnecessary internal impurities are eliminated, the outer shuttle is fine in sintering shrinkage uniformity, the granularity of the raw material powder is proportionally adjusted within the range of nanometers to 80 micrometer as needed, the cost of raw materials is greatly reduced, and the density and the performance of the outer shuttle meet requirements.

Description

technical field [0001] The invention relates to a sewing machine accessory, in particular to an outer hook of a rotary hook in the sewing machine. Background technique [0002] The outer hook of the hook is one of the main accessories in the hook. The outer shuttle has a complex structure and is finely made. The existing production methods are generally produced by cold extrusion and turning and milling mechanical processing methods. The production and processing procedures are cumbersome and complicated (up to more than 300 procedures), which cannot be mass-produced and the utilization rate of metal materials is low. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for manufacturing the outer hook of the rotary hook by using the injection molding method, the process is simple, the production efficiency is high, and the metal material utilization rate is high. [0004] In order to solve the above techni...

Claims

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Application Information

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IPC IPC(8): B22F3/22B22F5/00D05B57/14C22C38/12
Inventor 申建中
Owner ZHEJIANG YIHUO TECH
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