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Method and device for friction spot welding of titanium alloy/ultra-high molecular weight polyethylene overlap

An ultra-high molecular weight, titanium alloy technology, used in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of ineffective control of temperature and down pressure, inability to achieve effective connection of titanium alloys, poor melt flow ability, etc. , to facilitate the connection parameters, improve the quality and strength of the joint, and achieve the effect of small size

Active Publication Date: 2020-11-10
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does realize the connection between titanium alloy and ultra-high molecular weight, but the effect is not good. The main reason is that the interface temperature during the connection process is low, which is only higher than the melting temperature of ultra-high molecular weight polyethylene (136°C).
Although ultra-high molecular weight polyethylene is in a molten state at this temperature, its melt flow ability is extremely poor, and it cannot be effectively connected with titanium alloys.
At the same time, the temperature and downforce in the connection process are not effectively controlled, and the yield is too low

Method used

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  • Method and device for friction spot welding of titanium alloy/ultra-high molecular weight polyethylene overlap
  • Method and device for friction spot welding of titanium alloy/ultra-high molecular weight polyethylene overlap
  • Method and device for friction spot welding of titanium alloy/ultra-high molecular weight polyethylene overlap

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Such as figure 2 , using the method of the present invention, design and manufacture a double-layer titanium alloy structure with three-dimensional printing technology, the lower layer rough layer 6 is a solid block part, and its surface average roughness (Ra) is 100-500 μm, and the upper layer titanium alloy 5 is a diamond type Complex porous structure with a porous diameter of 0.6mm–1.2mm. Both layers have a thickness of 2 mm. The dimensions of metal and UHMWPE sheets are 4mm×20mm×60mm and 6mm×25mm×60mm (height×width×length), respectively. The melting point of the polymer plate is 136° C., and an opening 12 for inserting a thermocouple is provided on the side of the metal.

[0051] Such as figure 1 , put pressure sensor 8 through The thick thread of the thick thread is fixed on the lower end of the workbench 9, the three-dimensionally printed titanium alloy porous structure rough layer 6 is placed downwards, and placed in an overlapping connection with the ultra...

Embodiment 2

[0058] According to the method in Embodiment 1, the titanium alloy and ultra-high molecular weight polyethylene sheet with the same parameters were clamped on the workbench, and preheated with a heat gun. Start the rotary tool 1 and rotate it at a speed of 555rpm to press down on the surface of the titanium alloy 5, firstly press down at a pressing speed of 0.04mm / s for 20s, and when it reaches the pressing amount of 0.8mm, adjust the pressing speed to 0.013mm / s Continue to press down for 30 seconds, and stop rotating and pressing down to 1.2mm. Wait for 3 minutes until the interface temperature drops to 50°C and lift the rotary tool 1, and the connection process ends.

[0059] In this example, the temperature at the center of the interface reached 340°C. At the same time, the peak pressure reached 1700N, and the pressure increase at the peak pressure at the connection end was significantly reduced, which proved that the softening degree of the polymer was obvious. The streng...

Embodiment 3

[0062] According to the method in Embodiment 1, the titanium alloy and ultra-high molecular weight polyethylene sheet with the same parameters were clamped on the workbench, and preheated with a heat gun. Start the rotary tool 1 and rotate it at a speed of 555rpm to press down on the surface of the titanium alloy 5, firstly press down at a pressing speed of 0.04mm / s for 20s, and when it reaches the pressing amount of 0.8mm, adjust the pressing speed to 0.02mm / s Continue to press down for 30 seconds until the 1.4mm press down, stop turning and press down. Wait for 3 minutes until the interface temperature drops to 50°C and lift the rotary tool 1, and the connection process ends.

[0063] The temperature at the center of the interface measured in this embodiment reaches 400° C., which has reached the temperature of severe thermal degradation of polymers. At the same time, the peak downforce reached 1600N, and the pressure growth rate decreased to a negative value at the end of ...

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Abstract

The invention relates to a method and a device for lap joint friction spot welding of a titanium alloy / an ultra high molecular weight polyethylene. The method for the lap joint friction spot welding of the titanium alloy / the ultra high molecular weight polyethylene includes the following steps that (1) the titanium alloy is enabled to make contact with the ultra high molecular weight polyethylenein a lap-joint mode, and fixed to a worktable by a clamping device; (2) the lap joint contact area is preheated to make ultra high molecular weight polyethylene block materials be softened; and (3) the metal surface is pressed down through a rotary tool, the friction between the rotary tool and the metal surface can generate heat, the rotating speed of the rotary tool is controlled between 500 rpm / min and 4000 rpm / min, the pressing-down speed is between 0.5 mm / min and 6 mm / min, the maximum temperature at the interface position during the connection process is controlled at 230 DEG C-400 DEG C,so that the titanium alloy is connected with the ultra high molecular weight polyethylene. The device consists of the rotary tool, a clamping tool, a worktable main body, a thermocouple and temperature measuring device and a pressure sensor. Compared with the prior art, the method and the device for the lap joint friction spot welding of the titanium alloy / the ultra high molecular weight polyethylene is simple and portable in design, effective and reliable, and can meet the preparation of joints with high strength and connection quality between the titanium alloy and the ultra high molecularweight polyethylene.

Description

technical field [0001] The invention relates to welding of dissimilar materials, in particular to a method and device for friction spot welding of titanium alloy / ultra-high molecular weight polyethylene overlap. Background technique [0002] The combination of metals and polymers is in great demand in the automotive industry, aerospace, biomedicine and other fields. However, the large differences in mechanical, thermal, and chemical properties make metal / polymer connections more difficult. Adhesive bonding, mechanical connection and new welding processes are common metal / polymer material connection processes. [0003] Although the cost of mechanical connection is low and the disassembly and assembly are convenient, problems such as stress concentration, loose connection, and large residual stress are prone to occur in the joint. At the same time, the use of rivets will also increase the weight and cost of the overall structure. Adhesive bonding can realize the connection w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12
Inventor 蒋沐阳陈科单爱党张善勇杨驰
Owner SHANGHAI JIAO TONG UNIV
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