Method for manufacturing rotating shuttle inner shuttle through injection molding method

A technology of injection molding and manufacturing method, which is applied in the field of rotary hook and inner shuttle, can solve the problems of low utilization rate of metal materials, cumbersome manufacturing and processing procedures, and inability to large-scale production, and achieves good sintering shrinkage consistency and high utilization rate of metal materials. , the effect of eliminating component segregation

Active Publication Date: 2013-03-13
ZHEJIANG YIHUO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inner 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 rotating shuttle inner shuttle through injection molding method
  • Method for manufacturing rotating shuttle inner shuttle through injection molding method
  • Method for manufacturing rotating shuttle inner shuttle through injection molding method

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 as feed material, and then the feed material is injection molded; after molding, the inner shuttle of the rotary hook is sintered.

[0039] The comparative example of embodiment 1 is injecte...

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 as feed material, and then the feed material is injection molded; after molding, the inner 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 ...

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 as feed material, and then the feed material is injection molded; after molding, the inner 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 f...

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Abstract

The invention discloses a method for manufacturing a rotating shuttle inner shuttle through an injection molding method. The rotating shuttle inner shuttle adopts the following alloy material: Fe2NiMo, FeCrMo or FeCr; and the manufacturing method of the rotating shuttle inner shuttle comprises the following steps: firstly, performing segregation-free mixing on raw material alloy powder, secondly, performing alloying treatment on the raw material alloy powder, thirdly, grinding and screening the raw material alloy powder, fourthly, performing feed preparation on the raw material alloy powder, fifthly, performing injection molding on feed, sixthly, sintering a molded rotating shuttle inner shuttle, seventhly, performing surface shaping treatment, so as to achieve the required size, and eighthly, performing sandblasting or polishing treatment on the surface of the rotating shuttle inner shuttle. The method has the advantages that Fe2NiMo, FeCrMo or FeCr is adopted as raw material, so that composition segregation and unnecessary internal impurities are eliminated, and the sintering and shrinkage uniformity of the product is good.

Description

technical field [0001] The invention relates to sewing machine accessories, in particular to an inner hook of a rotary hook in the sewing machine. Background technique [0002] The inner hook of the hook is one of the main accessories in the hook. The inner 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 inner shuttle of the rotary hook by using the injection molding method, which has simple process, high production efficiency and high utilization rate of metal materials. [0004] In order to solve the above technical p...

Claims

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Application Information

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IPC IPC(8): B22F3/22B22F5/00B22F3/16D05B57/14D05B57/26
Inventor 申建中
Owner ZHEJIANG YIHUO TECH
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