A method for forming high-toughness bent sub-pins

A forming method and technology of folding sub-needles, which are applied in auxiliary welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of high scrap rate, brittleness of sub-pins, and unusability, so as to achieve no scratches and simplify the molding method. , the effect of improving production efficiency

Active Publication Date: 2021-12-21
上海亚尔精密零件制造有限公司
View PDF6 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for forming high-toughness bent sub-pins

Examples

Experimental program
Comparison scheme
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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
angleaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for forming a high-toughness bent sub-needle. The sub-needle includes a sub-needle head and a sub-needle wire. The sub-needle head and the sub-needle wire are integrally formed, and are welded on the top of the sub-needle wire by micro-arc welding. The sub-needle is obtained by direct molding; the tip of the welding electrode in the micro-arc welding process is arc-shaped, the angle of the tip is 40-50 degrees, and the radian of the tip is 0.1-0.3; the pulse width used in the micro-arc welding process is The welding power is 1150ms‑1400ms, and the welding power is 1.4W‑1.8W. Compared with the prior art, the present invention has the advantages of high qualified rate of products, high production efficiency and low cost, and the produced sub-needles have good appearance quality, smooth spheres, no scratches, bruises, and smooth surfaces.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityPatents(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