Method for manufacturing rotating shuttle through injection molding method

An injection molding and manufacturing method technology, applied in the field of sewing machine accessories, can solve the problems of poor size controllability, poor product consistency, and easy segregation in the sintering process, and achieve good sintering shrinkage consistency, eliminate component segregation, and injection product consistency Good results

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

Moreover, composition segregation leads to poor dimensional controllability in the sintering process
In addition, the injection process of the rotary hook inner shuttle in the above invention patent is prone to segregation, resulting in poor product consistency

Method used

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  • Method for manufacturing rotating shuttle through injection molding method
  • Method for manufacturing rotating shuttle through injection molding method
  • Method for manufacturing rotating 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 rotary hook is sintered.

[0039] The comparative example of embodiment 1 is injected with the atomized 2...

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 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, one-time pa...

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 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 rate of 20C...

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Abstract

The invention discloses a method for manufacturing a rotating shuttle through an injection molding method. The rotating shuttle adopts the following alloy material: Fe2NiMo, FeCrMo or FeCr; and the manufacturing method of the rotating 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, and sixthly, sintering a molded rotating shuttle. The method has the advantages that a product raw material formula is improved, iron powder spherical powder produced through a carbonyl process is taken as main raw material, 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 a rotary hook in the sewing machine. Background technique [0002] The rotary hook is an important part of the sewing machine. Among the sewing equipment, the sewing machine with lock stitch is the most common. These sewing machine great majority are to adopt rotary hook, hook thread loop with its shuttle tip, expand thread loop simultaneously, and guide thread loop to circle bobbin and form lock stitch. [0003] The metal material used in the existing rotary hook is generally 20Cr or 20CrMo material, the raw material is usually produced by atomization, and the particle size of the raw material is generally 5-20 microns. [0004] The Chinese invention patent with the publication number CN102500757A disclosed on June 20, 2012 a method for manufacturing the inner shuttle of the rotary hook, including injection molding steps, sintering steps and sandblasting steps. and 20Cr or 20CrMo ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22B22F5/00
Inventor 申建中
Owner ZHEJIANG YIHUO TECH
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