Manufacture method of needle bar connecting rod on two-needle sewing machine

A production method and sewing machine technology, applied in the direction of sewing machine needle holders, sewing machine components, sewing equipment, etc., can solve problems such as easy deformation, achieve the effects of reducing deformation and cracks, reducing stress concentration, and preventing strain and seizure

Inactive Publication Date: 2013-01-23
ANXIANG KAISI MECHANICAL PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcoming that the needle bar hole on the needle bar hole is retracted after nitrocarburizing and the notch is easily deformed during carburizing and quenching, the present invention proposes a production method of the needle bar link

Method used

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  • Manufacture method of needle bar connecting rod on two-needle sewing machine
  • Manufacture method of needle bar connecting rod on two-needle sewing machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment one, such as figure 1 The two ends of the needle bar hole 1 are processed into a tapered shape with a large outside and a small inside with a taper of 0.01:1 on a length of 0.5 mm.

Embodiment 2

[0023] Embodiment two, such as figure 1 , on the basis of Embodiment 1, and slightly increase the diameter of the middle section of the needle bar hole 1 by 0.005 mm.

Embodiment 3

[0024] Embodiment 3, as shown in Fig. 2, when the needle bar connecting rod is semi-finishing, the rectangular notch 4 and the six connecting points 5 of the two needle bar holes 1 are small arc transitions, and the small arc radius R=1.2mm.

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PUM

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Abstract

The invention provides a manufacture method of a needle bar connecting rod on a two-needle sewing machine, sequentially comprising the following steps of: rough machining, semifinishing, carburizing and quenching, finish machining and soft nitriding. The needle bar connecting rod comprises needle rod holes, a base seat and a handle part, which are connected into one body; the middle of the needlebar is provided with a rectangular gap; and after the rough machining, the finish machining and the finish machining, before the soft nitriding, the needle rod holes are minimally enlarged according to the size of the minim retracted quantity. The two ends of the needle rod holes are enlarged to be taper which has large outer part and smaller inner part, and when semifinishing, the rectangular gap and the six connection points of the two needle rod holes are machined to be small transition. Or when the semifinishing, the rectangular gap and three longitudinal edges intersect with the two needle rod holes are machined to be large arc. The method can effectively prevent the surface of the needle rod from being badly pulled and deadly occluded, machines a gap right angle of the needle bar connecting rod into a proper arc, obviously reduces stress concentration during heat treatment, and effectively reduces the deformation and the cracks of the needle bar connecting rod.

Description

technical field [0001] The invention relates to an industrial sewing machine, namely a production method of a needle bar connecting rod of a double-needle sewing machine. Background technique [0002] The needle bar connecting rod is a key part in the double needle sewing machine. The 2 needle bars move up and down relative to each other in the 2 holes of the needle bar link. It is required that the needle bar and the needle bar link have sufficient matching precision. The hole wall must have a reliable and uniform nitrocarburized layer, and because the force is concentrated, the needle bar connecting rod is required to have sufficient strength. [0003] The design requirements of the needle bar connecting rod are: carburizing and quenching after rough and fine machining, then processing to the drawing design requirements, and finally soft nitriding treatment, and no further processing after soft nitriding is allowed. [0004] After the nitrocarburizing treatment, the shap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D05B55/00D05B55/10
Inventor 申建春李才俊刘军
Owner ANXIANG KAISI MECHANICAL PARTS
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