Production method of tightening device oil cylinder

Abstract

The invention relates to a production method of a tightening device oil cylinder. The method includes the following steps that (1) material preparation is performed, specifically, blank materials of acylinder barrel and a flange are prepared in advance according to the size of the oil cylinder; (2) cleaning of the welding surface is performed; (3) pre-heating is performed; (4) friction welding isperformed, specifically, the blank materials of the cylinder barrel and the flange are clamped on friction welding equipment separately, the welding rotating speed is 800-1200 r / min, the upsetting force is 80-150 T, the welding depth is 3-5 mm, and the welding time is 0.2-3 min; (5) heat treatment is performed, a finished product obtained after friction welding is finished is put in a heating furnace to be heated to 150-250 DEG C, and thermal insulation is performed for 2 h; (6) semi-finishing is performed; and (7) finish machining is performed. By means of the production method of the tightening device oil cylinder, the production of a tightening oil cylinder is performed in a friction welding mode, the material cost and the machining cost are reduced, and the production efficiency is improved; and besides, during friction welding, a welded material is usually not molten, and thus the phenomena of welding defects and welding embrittlement which are relevant to melting and solidification cannot occur.

Description

technical field [0001] The invention relates to a production method of an oil cylinder of a tensioning device, which belongs to the technical field of engineering machinery. Background technique [0002] Due to the rapid development of the construction machinery industry in China in recent years, the country has vigorously promoted the development of the construction machinery manufacturing industry. At the same time, because the level of my country's construction machinery manufacturing industry is still relatively backward compared with foreign countries, foreign construction machinery giants firmly grasp key technologies , to curb the development of domestic manufacturing level. With the increase of domestic demand for construction machinery, the contradiction between supply and demand has gradually increased. Among them, the excavator has the advantages of large traction, strong climbing ability, and small turning radius, so it has been widely used in engineering constru...

AI Technical Summary

Problems solved by technology

Due to the shape of the cylinder (including cylinder and flange, the diameter of the flange is larger than the cylinder), it needs to consume a large amount of aluminum billet to form it, resulting in nearly 72% waste of aluminum billet

Moreover, the blank for processing the oil cylinder is an extruded bar, which has poor isotropy, and the structure and mechanical properties are not uniform enough, which affects the performance of the product.

And due to the complexity of the CNC equipment system, the operators require high quality and high maintenance costs

[0005] The invention patent with the application number 201710426823.4 discloses a production method of an oil cylinder, which makes the internal structure of the metal flow dense and uniform through forging, which improves the performance of the original extruded material, reduces the amount of raw materials, and improves the utilization rate of the material, but its production process is extremely Complicated, low production efficiency, and high production costs

Later, there is also a process of producing oil cylinders by welding in the market, but the welding process used is fusion welding. During the welding process, some welding defects and welding embrittlement related to melting and solidification metallurgy will appear, such as thick columnar crystals, segregation, inclusions, cracks and pores, etc.

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