Production of frame tube of bicycle with magnesium alloy, frame tube and frame

A production method and magnesium alloy technology, applied in bicycle frames, bicycle accessories, transportation and packaging, etc., can solve problems such as difficulties in producing non-motor vehicle frame tubes and frames, affecting product quality, and overburning of weld grains , to achieve the effect of bright and beautiful color, uniform comprehensive performance and high pass rate

Inactive Publication Date: 2009-03-18
于克儒
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Experiments have found that welding process parameters have a great influence on the shape of the weld surface. If the current is too small, the base metal will not melt, and it is prone to incomplete fusion and incomplete penetration; if the current is too large, the base metal will be deformed and burn through easily. , the weld has defects such as grain overburning, pores, cracks, etc. Sometimes although a weld with a smooth surface can be formed, there are pores inside
Seriously affect the quality of products after welding
Therefore, it is very difficult to produce non-motor vehicle frame tubes and frames with magnesium alloys.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The cut-off magnesium-aluminum series alloy bar with a weight percentage of 6% Al is subjected to surface peeling treatment, then placed in an electric heating furnace and heated to 400° C., and kept for 24 hours for homogenization annealing treatment. Take it out of the oven and air cool to room temperature, then put it into an electric heating furnace and heat it to 355°C±5°C, and keep it warm for 3 hours. When heating, use 4 sections to control the furnace temperature and force the gas to circulate. At the same time, the extrusion die is heated to 340°C±10°C, and the extrusion barrel is heated to 340°C±10°C. The above-mentioned heated magnesium alloy rods are put into an extruder and extruded into frame tube profiles at an extrusion speed of 3-4m / min. During the extrusion process, the temperature should not be too high to melt the magnesium rod and cause burning, or the temperature is too low to be extruded or the mold will be damaged. After extrusion, according to...

Embodiment 2

[0060] The production weight percentage is the magnesium-aluminum series alloy frame pipe and the vehicle frame of 3% Al, and the production method, the requirements of bending, smashing flat, welding process, and welding wire impurities are the same as in Example 1, except that the extruding process is the bar heating temperature 395°C ± 5°C, keep warm for 3 hours. At the same time, the extrusion die is heated to 380°C±10°C, and the extrusion barrel is heated to 380°C±10°C. The extrusion speed is 6-7m / min. The composition of the welding wire is basically the same as that of the alloy to be welded.

[0061] The frame of this composition alloy can be subjected to stress relief annealing heat treatment, that is, the above frame is put into an aging furnace to be heated for stress relief annealing. The heating temperature is 190°C±10°C, kept for 1-2 hours, and then taken out of the furnace and air cooled to room temperature.

[0062] The tensile strength of the magnesium alloy ...

Embodiment 3

[0064] To produce magnesium-aluminum series alloy frame tubes and frames with 10% Al by weight, the production methods of bending, flattening, welding process, and welding wire impurities are the same as in Example 1. The extrusion process is that the heating temperature of the rod is 310°C±10°C and the temperature is kept for 2 hours. At the same time, the extrusion die is heated to 310°C±10°C, and the extrusion barrel is heated to 310°C±10°C. The extrusion speed is 2-3m / min. The composition of the welding wire is basically the same as that of the alloy to be welded.

[0065] The frame of this composition alloy can be subjected to T6 heat treatment, that is, first put the above frame into a heating furnace and heat it to 530°C, keep it warm for 4-12 hours, water-cool, then heat it to 200-220°C, and keep it warm for 12-16 hours , air cooling for artificial aging treatment.

[0066] The tensile strength of the magnesium alloy frame with this composition can reach 310Mpa, the...

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Abstract

A Mg-alloy frame made of Mg-alloy tubes and with high mechanical performance, light weight and low cost is disclosed. Said Mg-alloy tube is made up of Mg-alloy rod through removing peel, heating at 400 deg.C for 24 hr, cooling in air, heating at 300-400 deg.C for 3 hr, and hot die pressing.

Description

technical field [0001] The invention relates to a non-motor vehicle part, in particular to a non-motor vehicle frame tube and frame made of magnesium alloy and a method for producing the frame tube and frame by an extrusion method. Background technique [0002] At present, the possession of non-motor vehicles (such as bicycles, electric bicycles, tricycles, etc.) in China is very large. For bicycles, there are about 500 million bicycles in my country, and the number of people using bicycles as a means of transportation is about 600 million. But along with the improvement of people's quality of life and the transformation of life concepts, bicycles have become the best tool for sports and leisure activities while acting as a means of transportation. At present, 20 million people in the United States ride bicycles for fitness; in Europe, cycling "one-day tour" has also become one of the most fashionable fashion sports. [0003] In the selection of materials for bicycle frames...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B62K19/04C22C23/02
Inventor 于克儒
Owner 于克儒
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