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Forging Process Improvement of Precision Cylinder Steel Tubes
Views: 0 Author: Site Editor Publish Time: 2025-09-25 Origin: Site
Forging Method and Process Improvement of Precision Cylinder Steel Tubes
The forging method of precision cylinder steel tubes usually adopts free forging. To reduce the machining allowance of the precision cylinder steel tube head, the piston head is forged first and then welded to the precision cylinder steel tube.
This process uses the combined forming of free forging and rotary forging to process precision cylindrical steel tubes. It not only shapes the head of the precision cylindrical steel tube but also realizes the integration of the head and rod of the precision cylindrical steel tube. Meanwhile, this process can produce products of several different specifications with a single set of dies.
Keywords: Precision Cylindrical Steel Tubes; Forging; Free Forging; Die Forging
With the accelerated pace of construction in central and western China, the market for large excavators has become increasingly active [1]. Large excavators mainly rely on working cylinders to drive the operation of equipment. The working cylinder of an excavator is a Class A component (important component or safety component) in engineering excavators [2], and precision cylinder steel tubes are key components of various working cylinders.
Precision cylinder steel tubes are in an alternating state of tensile and compressive stress, and this alternation occurs instantaneously, resulting in large impact loads. The close contact with fillers and frictional heat generation cause their temperature to rise. Such working conditions require the blank to be a forging, with high machining accuracy and strong comprehensive mechanical properties. At the working temperature, the hardness of the part in contact with the filler should be high, and the roughness should be between Ra 0.16μm and Ra 0.32μm [3].
If the design of the precision cylinder steel tube is unreasonable, or its manufacturing, use, and maintenance are improper, it may lead to early fracture of the precision cylinder steel tube, damage to other parts, and in severe cases, damage to the entire equipment [4]. Based on production conditions, engineers and technicians have conducted research on the material selection, heat treatment, and machining of precision cylinder steel tubes, but there is little research on rough machining. Combining with actual production, this paper studies the forging blank process.
1 Original Machining Process and Existing Problems
1.1 Free Forging Machining Technology
Free forging machining technology can fully meet the actual production needs when the batch size is small. However, for mass production, its shortcomings are exposed. The free forging process is as follows: Heating → Forging (2t free forging hammer) → Normalizing → Rough Machining → Heat Treatment → Finish Machining.(1) The labor intensity of machining is high, and it is very difficult to machine the head of precision cylinder steel tubes with complex shapes entirely by hand.
