Short-flow continuous forming device for tin-bismuth alloy welding wire and forming method

A tin-bismuth alloy and forming device technology, applied in metal rolling and other directions, can solve the problems of large casting traction resistance, insufficient elongation, long production process, etc., achieve easy installation and production operation, improve axial deformation capacity, and cast The effect of shrinking process space

Inactive Publication Date: 2016-05-25
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the plasticity of tin-bismuth alloy is extremely poor under general conditions, and the elongation is less than 0.5%. Under the current welding wire production technology and equipment conditions, it cannot be plastically formed
At present, the casting technology is designed with a crystallizer, resulting in a large casting traction resistance, and it is impossible to continuously cast rods below Ф6mm; the production of tin-bismuth alloy wire by extrusion method also has poor plasticity and cannot achieve large deformation extrusion.
In addition, due to the extremely poor plasticity of tin-bismuth alloys, it is more difficult to achieve continuous tensile deformation, so it is currently difficult to produce such welding wires smoothly
It has to rely on multi-pass extrusion and multi-pass stretching with extremely small deformation for production. There are too many passes, the production process is long, and the production efficiency is extremely low.

Method used

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  • Short-flow continuous forming device for tin-bismuth alloy welding wire and forming method

Examples

Experimental program
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Effect test

Embodiment 1

[0049] like figure 1 As shown, the device of the present invention is a tin-bismuth alloy continuous casting and rolling system composed of a melt holding furnace 1, a heat insulating plate 3 with a casting hole 2, a lead rod 5, a guide wheel 6, a sprinkler 4, and a rolling mill 7. Used to prepare Sn-58wt%Bi alloy wire with a diameter of 3.0mm.

[0050] First, process the casting hole 2 of the mica-based insulation board 3 to a diameter of 3.6mm, and install and fix it at the corresponding position of the melt holding furnace 1, and use asbestos to plug the casting hole tightly. Select the pass type of the roll 8 in the rolling mill 7 as Ф3.0mm, and at the same time select the size of the groove of the guide wheel to the corresponding range, and determine the vertical distance between the center of the roll and the casting hole as 300-600mm. The smelted Sn-58wt% Bi alloy melt 9 with acceptable composition is transferred into the melt holding furnace 1, so that the liquid leve...

Embodiment 2

[0052] The difference between this embodiment and Example 1 is that five Sn-58wt%Bi alloy welding wires with a diameter of 2.5 mm were simultaneously prepared on one device of the present invention.

[0053] combine figure 1 , 5 casting positions are processed on one side of the melt holding furnace 1, and the 5 casting positions are uniformly and compactly arranged in a horizontal line, and guide wheels 6 and sprinklers 4 of corresponding sizes are installed correspondingly behind each casting position. Design the rolling mill 7 and roll 8 with sufficient length, and cut out 5 Ф2.5mm pass patterns on the roll 8, the position between each pass pattern corresponds to the corresponding 5 casting positions, and the corresponding guide wheel 5 on the same straight line. Select a 5mm thick graphite plate as the material of the insulation board 3, process the casting holes 2 of the five insulation boards 3 into a diameter of 3.1mm, and install and fix them in 5 corresponding positi...

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Abstract

The invention discloses a short-flow continuous forming device for a tin-bismuth alloy welding wire. The short-flow continuous forming device comprises a melt heat-preserving furnace, a heat-preserving plate with a casting hole, a guide wheel, a water atomizer, a guide rod and a rolling mill, wherein the heat-preserving plate with the casting hole is fixedly connected to the side face of the melt heat-preserving furnace; the water atomizer is arranged on an upper part behind the casting hole; the rolling mill is positioned behind the casting hole; the guide rod is inserted into the casting hole, and is arranged on a traction machine; the guide rod passes through the guide wheel. By adopting the short-flow continuous forming device for the tin-bismuth alloy welding wire and a forming method provided by the invention, show-flow machining of the tin-bismuth alloy welding wire which is difficult to form is realized, and the production process is shortened remarkably.

Description

technical field [0001] The invention relates to the field of metal processing, in particular to a short-flow continuous forming device and a forming 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 poorly plastic 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. ...

Claims

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Application Information

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IPC IPC(8): B21B1/46
CPCB21B1/463
Inventor 李明茂肖翔鹏陈辉明
Owner JIANGXI UNIV OF SCI & TECH
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