Needle rod eccentric pin of sewing machine and manufacturing method thereof

An eccentric pin and sewing machine technology, applied in the field of mechanical processing, can solve the problems of high processing cost and unstable quality, and achieve the effects of low cost, stable product quality and convenient operation

Inactive Publication Date: 2013-05-15
NINGBO RUIMING MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the needle bar eccentric pin made of steel needs to go through multiple processing procedures, the processing cost is high, and the quality is unstable

Method used

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  • Needle rod eccentric pin of sewing machine and manufacturing method thereof
  • Needle rod eccentric pin of sewing machine and manufacturing method thereof
  • Needle rod eccentric pin of sewing machine and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Put the zinc alloy whose composition is shown in Example 1 in Table 1 into the melting furnace, and raise the temperature to 315° C. in the atmosphere to melt the zinc alloy into molten metal. At room temperature, the zinc alloy metal is hydraulically injected into an existing common mold for producing eccentric pins and left to stand, and then the metal is hydraulically cast into an eccentric pin blank at a pressure of 98Mpa. The blank is then vibrated and ground into a needle bar eccentric pin.

Embodiment 2

[0029] Put the zinc alloy whose composition is shown in Example 2 in Table 1 into the melting furnace, and raise the temperature to 325° C. in the atmosphere to melt the zinc alloy into molten metal. At room temperature, the zinc alloy metal is hydraulically injected into the existing common mold for manufacturing eccentric pins and left to stand, and then the metal is hydraulically cast into a needle bar eccentric pin blank at a pressure of 103Mpa. The blank is then vibrated and ground into a needle bar eccentric pin.

Embodiment 3

[0031] Put the zinc alloy whose composition is shown in Example 3 in Table 1 into the melting furnace, and raise the temperature to 310° C. in the atmosphere to melt the zinc alloy into molten metal. At room temperature, the zinc alloy metal is hydraulically injected into an existing common mold for manufacturing eccentric pins and left to stand, and then the metal is hydraulically cast into a needle bar eccentric pin blank at a pressure of 95Mpa. The blank is then vibrated and ground into a needle bar eccentric pin.

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PUM

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Abstract

The invention provides a needle rod eccentric pin of a sewing machine and a manufacturing method thereof. The needle rod guide eccentric pin is made of zinc alloy, wherein the zinc alloy comprises the following components in percentage by weight: 3.90%-4.30% of aluminum, 0.03%-0.06% of magnesium, 0.20%-0.50% of copper, not more than 0.035% of iron, not more than 0.004% of lead, not more than 0.003% of cadmium not more than 0.001% of tin, and the balance of zinc. The invention further provides the manufacturing method of the needle rod eccentric pin. The needle rod eccentric pin provided by the invention is convenient to machine and operate, less in processes, capable of improving the production efficiency, easy for realization of mechanization and automation, stable in quality and low in cost.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and relates to an eccentric pin of a sewing machine needle bar and a preparation method thereof. Background technique [0002] The needle bar is an important part of the household multifunctional sewing machine. Needle bars on industrial sewing machines are made of carbon steel or stainless steel, requiring good surface treatment, free from cracks, damage, burrs, rust and other defects. The radial roundness of the needle bar is required to be less than 0.005mm. The straightness of the needle bar is required to be less than 0.01mm for every 100mm between the fulcrums and the center. The eccentricity of the needle hole or the needle groove on the needle bar to the axis must be Below 0.05mm. Due to the good requirements of the needle bar, the eccentric pin, which is an important part of the needle bar, also has high requirements. At present, the commonly used material of the eccentri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C18/04B22D17/22
Inventor 冯光松
Owner NINGBO RUIMING MACHINERY
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