Sand bottom technique and mold thereof

A process and mold technology, applied in the field of production process and mold, sand bottom process and mold field, can solve the problems of pilling, high price, waste, etc., and achieves the goal of not easy to break, low cost, and simple and easy processing. effect of operation

Active Publication Date: 2009-06-10
ZHEJIANG HUAYA MACHINE PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The price of titanium alloy is very expensive. In order to solve the problems of thread pilling and fraying in the process of using the sewing machine, it seems too wasteful and extravagant to use such an expensive metal to solve this problem.

Method used

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  • Sand bottom technique and mold thereof
  • Sand bottom technique and mold thereof
  • Sand bottom technique and mold thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1, such as figure 1 , figure 2 As shown, there is a circular cylinder 3 coaxial with it in the middle of the annular fixed support 1, the circular cylinder 3 is a hollow annular cylinder, and there are fixed bars 4 at the bottom of the fixed support 1, and the fixed bars 4 The two ends are in contact with the fixed support 1, the circular cylinder 3 is installed on the fixed bar 4, there is a semi-circular fixed bar 2 on the side wall of the fixed support 1, and the semi-circular fixed bar 2 and the annular fixed support 1 The axes are parallel; if image 3 Shown, turning head 6 is made of rubber, and its diameter is identical or approximate with the diameter of sewing machine bobbin case, and the center of turning head 6 has a through hole 7, and the diameter of through hole 7 is identical with rotating shaft 5 or approximates.

[0029] When used, such as image 3 , Figure 4 As shown, when the mold is working, it is mixed with sandpaper, contacts with the...

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PUM

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Abstract

The present invention relates to sewing machine producing technology, and is especially bobbin case sanding process and mold for smoothening the bottom and side wall of bobbin case to reduce damage to sewing thread. The technological scheme of the present invention includes the following steps: 1. fixing bobbin case on a seat and fixing one rotating head with sleeved abrasive paper onto a drilling machine; 2. inserting the rotating head into the bobbin case and rotating to polishing the bobbin case for 1-10 sec; and taking out the rotating head with abrasive paper.

Description

technical field [0001] The invention relates to a production process in the field of sewing machines and a mold thereof, in particular to a sand bottom process and a mold thereof. Background technique [0002] The bobbin case of the sewing machine is one of the important parts of the sewing machine. Its quality determines the stability of the sewing machine, the quality of production, and the efficiency of production; the shape of the bobbin case is a ring with one side closed. When the inner surface is processed by hand, the processing is difficult and the effect is not good. The processed surface is still relatively rough. When the bobbin case rotates, it will cause great wear to other parts, and it will also affect the sewing thread. Sometimes the thread or its ball may be worn off. Although it can be barely used, it has a great impact on production. [0003] At present, the existing sand bottom technology adopts manual grinding, which has backward technology, low produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24D17/00B24D99/00
Inventor 徐凤南应江宝
Owner ZHEJIANG HUAYA MACHINE PARTS
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