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A kind of drawing forming device and method of tin-bismuth alloy welding wire

A tin-bismuth alloy, stretching forming technology, applied in the direction of drawing dies, etc., can solve the problems of increased single-pass deformation, increased probability of instability, and inability to stretch, and achieves reduction of secondary deformation, increased deformation, Optimize the effect of reasonable distance

Active Publication Date: 2018-08-07
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] On the other hand, although the plasticity of the tin-bismuth eutectic alloy is greatly enhanced at a slower deformation rate, which increases its single-pass deformation, the probability of instability under greater stress is also greatly reduced. Increase
During the stretching process of the alloy, the alloy wire still bears the tensile stress for a long time after it is released from the mold, and has creep conditions, which leads to its "neck shrinkage", secondary deformation after the mold is released, and the size is reduced, which seriously causes break, causing stretching to fail
Under the current conditions of traditional stretching equipment and stretching methods, this problem cannot be solved

Method used

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  • A kind of drawing forming device and method of tin-bismuth alloy welding wire

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Embodiment 1

[0049] The stretch forming device of the present invention is mainly composed of a mold base 1, a mold 2, a stretching liquid 3, a drawing machine 4, a constant temperature heater 5, a cooler 6, a winder 7, and an overflow circulation device 8, and is used for preparing Sn-57wt%Bi alloy wire with a diameter of 2.0 mm.

[0050] At first, the drawing forming device of above-mentioned a kind of tin-bismuth alloy welding wire is installed, and the drawing die 2 that sizing is Φ 2.0mm is installed in the mold base 1; Plug gently from the inside to the outside with a soft plug; at the outlet of the tin-bismuth alloy welding wire product 11 out of the mold, plug it gently from the outside to the inside with a soft plug; the cooler 6 uses a blower; the distance between the drawing machine 4 and the stretching mold 2 The distance of the outlet is 120mm. Pour tap water 3 into the middle of the mold base 1 so that the liquid level is always 20mm higher than the entrance and exit of the ...

Embodiment 2

[0053] The difference between this embodiment and Example 1 is that four Sn-57wt%Bi alloy welding wires with a diameter of 1.0 mm were simultaneously prepared on the device of the present invention.

[0054] Install four Φ1.0mm drawing dies 2 on the horizontal line on the mold base 1, and enter the four entrances on the same horizontal line of the mold base 1 on the four volumes of tin-bismuth alloy blanks 9 respectively, and lightly press them from the inside to the outside with a soft plug. Lightly plugged; at the outlet of the four pieces of tin-bismuth alloy welding wire products 11 out of the mold, gently plugged with a soft plug from the outside to the inside; the cooler 6 uses a blower; the distance between the drawing machine 4 and the outlet of the drawing die 2 is 100mm ; The drawing machine is engraved with four stretching grooves corresponding to the die opening; four winding machines are set behind the drawing machine. Pour oil 3 with a high volatility point into ...

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Abstract

The invention discloses a drawing forming device and method for a tin-bismuth alloy welding wire. A tin-bismuth alloy blank enters from an inlet of a die base, then penetrates through a drawing die assembled in the die base, and extends from an outlet of the die base, and a drawing machine is used for achieving drawing forming. Drawing liquid heated in a temperature-control mode is contained in the die base, and the liquid level is always higher than the die inlet and the die outlet of the drawing die. The tin-bismuth alloy welding wire difficult to form is drawn to be formed in a large-deformation mode, and the production working procedures are reduced remarkably.

Description

technical field [0001] The invention relates to the field of welding wire manufacturing, in particular to a stretching forming device and method for tin-bismuth alloy welding wire. Background technique [0002] Tin-bismuth alloy welding wire is a low-temperature alloy welding wire. Its composition ratio (mass percentage) is 43% tin and 57% bismuth. It is a binary eutectic alloy with a melting point of only 139°C under normal pressure. It has good fluidity and outstanding anti-oxidation performance. Therefore, it has excellent low-temperature brazing performance and has good application prospects in the field of low-temperature brazing. [0003] However, tin-bismuth alloy is also a very poorly ductile metal. Since the alloy is a eutectic alloy, its alloy structure is a mechanical mixture of tin and bismuth, and its phase composition is tin phase and bismuth phase. The mutual solid solubility between the two is very low, and the plasticity of bismuth is extremely low. Under ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C1/02B21C3/14B21C9/00
CPCB21C1/003B21C1/02B21C3/14B21C9/00
Inventor 李明茂陈辉明杨斌肖翔鹏
Owner JIANGXI UNIV OF SCI & TECH
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