Forming method of high-toughness bent sub-needle

A forming method and technology for folding sub-needles, which are applied in welding equipment, auxiliary devices, arc welding equipment, etc., can solve the problems of unusability, high rejection rate, brittleness of sub-pins, and improve production efficiency without scratches. , The effect of simplifying the molding method

Active Publication Date: 2020-08-28
上海亚尔精密零件制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tungsten and molybdenum-based bent sub-pins produced by the conventional micro-arc welding process were found during the processing process. Since the materials such as tungsten and molybdenum are relatively brittle, the temperature during micro-arc welding is very high. Near the micro-arc melting position, the inside of the material The crystal lattice changes and crystallization occurs, resulting in brittle fracture of the rear needle during the bending process, the reject rate is as high as 70%, and it is basically unusable

Method used

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  • Forming method of high-toughness bent sub-needle

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Effect test

Embodiment 1

[0024] A method for forming a high-toughness bent sub-needle, the sub-needle in this embodiment includes a sub-needle head and a sub-needle wire, such as figure 1 As shown, the sub-needle head and the sub-needle wire are integrally formed, and the sub-needle head is directly formed on the top of the sub-needle wire by micro-arc welding.

[0025] In the micro-arc welding process, the tip of the welding electrode is arc-shaped, the angle of the tip is 40 degrees, and the arc of the tip is 0.1; the pulse width used in the micro-arc welding process is 1150ms, and the welding current is 1.4W; The interval between adjacent pulses used is 5ms. The inert gas is used as the shielding gas in the micro-arc welding process. The pressure of the inert gas is 0.8Mpa, the flow rate is 0.2L / min, and the purity of the inert gas is 99.99%. The welding electrodes used in the micro-arc welding process are pure tungsten or activated tungsten rods. The invention ensures the central alignment of the...

Embodiment 2

[0029] A method for forming a high-toughness bent sub-needle, the sub-needle in this embodiment includes a sub-needle head and a sub-needle wire, such as figure 1 As shown, the sub-needle head and the sub-needle wire are integrally formed, and the sub-needle head is directly formed on the top of the sub-needle wire by micro-arc welding.

[0030] In the micro-arc welding process, the tip of the welding electrode is arc-shaped, the angle of the tip is 50 degrees, and the arc of the tip is 0.3; the pulse width used in the micro-arc welding process is 1400ms, and the welding current is 1.8A; The interval between adjacent pulses is 10ms. The inert gas is used as the shielding gas in the micro-arc welding process. The pressure of the inert gas is 2.5Mpa, the flow rate is 2L / min, and the purity of the inert gas is 99.999%. The welding electrodes used in the micro-arc welding process are pure tungsten or activated tungsten rods. The invention ensures the central alignment of the prod...

Embodiment 3

[0033] A method for forming a high-toughness bent sub-needle, the sub-needle in this embodiment includes a sub-needle head and a sub-needle wire, such as figure 1 As shown, the sub-needle head and the sub-needle wire are integrally formed, and the sub-needle head is directly formed on the top of the sub-needle wire by micro-arc welding.

[0034]In the micro-arc welding process, the tip of the welding electrode is arc-shaped, the angle of the tip is 45 degrees, and the arc of the tip is 0.15; the pulse width used in the micro-arc welding process is 1200ms, and the welding current is 1.5A; The interval between adjacent pulses is 6ms. The inert gas is used as the shielding gas in the micro-arc welding process. The pressure of the inert gas is 1.5Mpa, the flow rate is 1L / min, and the purity of the inert gas is 99.999%. The welding electrodes used in the micro-arc welding process are pure tungsten or activated tungsten rods. The invention ensures the central alignment of the produ...

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Abstract

The invention relates to a forming method of a high-toughness bent sub-needle. The sub-needle comprises a sub-needle head and a sub-needle wire, wherein the sub-needle head and the sub-needle wire areof an integrally formed structure, and the sub-needle head is directly formed at the top of the sub-needle wire by utilizing micro-arc welding; the tip of a welding electrode in the micro-arc weldingprocess is arc-shaped, the angle of the tip is 40-50 degrees, and the radian of the tip is 0.1-0.3; and the pulse width adopted by the micro-arc welding process is 1150ms-1400ms, and the welding power is 1.4W-1.8W. Compared with the prior art, the forming method has the advantages that the product percent of pass is high, the production efficiency is high, the cost is low, and the produced sub-needle is good in appearance quality, smooth in sphere, free of scratches and bruises, smooth in surface and the like.

Description

technical field [0001] The invention relates to a welding method, in particular to a forming method of a high-toughness bent sub-pin. Background technique [0002] Medical sub-needles are widely used in the medical minimally invasive surgery industry. Stainless steel, titanium, nickel-titanium and other materials are mostly used. The main structure of the product includes the sub-needle wire for conductive connection and the top sub-needle of the main part of the operation. However, due to the poor high temperature resistance of materials such as stainless steel and titanium, during the actual operation, it was found that adhesions and other phenomena often appeared after heating with electricity, which affected the effect. Therefore, biocompatible tungsten and molybdenum are currently used. The material is used as the material of the sub needle for processing and production, and it is bent and used in the subsequent assembly process. [0003] There are two existing sub-nee...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B23K9/167B23K9/32B23K37/00
CPCB23K9/167B23K9/32B23K37/003
Inventor盛誉盛冬梅严永原
Owner上海亚尔精密零件制造有限公司