Drawing forming device and method for tin-bismuth alloy welding wire

A tin-bismuth alloy, stretching forming technology, applied in wire drawing dies and other directions, can solve the problems of single-pass deformation increase, stretching cannot be carried out, and instability probability increases, so as to reduce secondary deformation, optimize reasonable distance, The effect of increased deformation

Active Publication Date: 2016-05-25
JIANGXI UNIV OF SCI & TECH
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  • Abstract
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  • 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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  • Drawing forming device and method for tin-bismuth alloy welding wire

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Embodiment 1

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

[0050] First, install the above-mentioned stretch forming device for the tin-bismuth alloy welding wire, and install the stretching die 2 with a diameter of Φ2.0 mm in the die base 1; at the entrance of the tin-bismuth alloy blank 9 into the die base 1, Gently plug with a soft plug from the inside to the outside; at the exit of the tin-bismuth alloy welding wire product 11, gently plug it with a soft plug from the outside to the inside; the cooler 6 uses a hair dryer; the drawing machine 4 is far from the drawing die 2 The distance to the exit is 120mm. Pour tap water 3 into the die base 1 so that the liquid level is always 20 mm higher than the die entr...

Embodiment 2

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

[0054] Install four drawing dies 2 with a diameter of 1.0 mm on a horizontal line on the die base 1, and enter the four rolls of tin-bismuth alloy blanks 9 into the four inlets on the same horizontal line of the die base 1, and use soft plugs to lighten them from the inside to the outside. Lightly plug; at the exit of the four tin-bismuth alloy welding wire products 11, gently plug 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 exit of the drawing die 2 is 100mm ; Four drawing grooves corresponding to the die outlet are engraved in the drawing machine; four winding machines are set behind the drawing machine. Pour the oil 3 with high volatilization point into the die base 1 so that the liquid level is a...

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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 Applications(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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