Advantages and Disadvantages of Production Stainless Steel Pipe by the Spinning Method

Spinning stainless steel and production is a high-quality, precise, economical and flexible forming method. It uses stainless steel plates or stainless steel pipe as blanks, fixes the blanks on the mandrel, makes it rotate with the mandrel, and the spinning roller rolls along the mandrel to roll the blank into a shell with the same shape as the mandrel. Since the deformation only occurs in a very small area in contact with the spinning roller during spinning, the deformation force is small. In this way, not only can the accuracy of the product be improved, but also the equipment with a smaller tonnage can be used to process larger products of various materials. This feature has aroused the interest and attention of pressure processing personnel and made the spinning method Get continuous development. To sum up, the spin forming method has the following advantages:

1) The product produced by the spinning method has a smooth surface and high precision. For example, the shell with a diameter of 150mm can have a precision of + -0.005mm; the tolerance of the spacecraft shell is + -0.4mm, and it is easy to meet the requirements by the spinning method. Usually under the condition of strong spinning, the rebound of metal is also very small. As long as the proper spinning roller type and a certain viscosity of lubricant are selected, the surface finish of the product can be almost comparable to the surface quality of the product after surface grinding.

2) After spinning the metal material, the grains are redistributed in the metal flow direction, which greatly improves the fatigue strength of the material; and its yield point, strength and hardness have also been improved, but the plastic index has decreased.

3) The spin forming method can produce products of various metals and their alloys such as lead, copper, magnesium, titanium, zirconium, tungsten, molybdenum, etc., as well as products of stainless steel, alloy steel and various low plastic materials.

4) The spin forming method can be used to produce a variety of complex thin-walled products with a wide range of specifications. It can be used to manufacture structural parts or mechanical parts, such as aircraft or rocket shells or engine parts, which can greatly reduce the weight and saving of the machine. metallic material.

5) The tool consumption of spin forming is low. Compared with the deep drawing method, the tool consumption is only one tenth of that of deep drawing.

6) The metal consumption is low, and it is a chipless processing. It is a product rotated by Angang Seamless Factory, which can increase the material utilization rate of the original chip processing from 3.6% to 54.2%. Increased to! 81.2%. Short processing cycle and low production cost.

7) It is easy to realize automatic operation. Because the relative motion of tools and processed parts is similar to ordinary machine tools, various program control, numerical control and automation technologies achieved in machine tool production can be transplanted into spinning production. And the spinning operation technology and process are much simpler than the lathe processing.

8) The production process of the spinning method is flexible, which is convenient for the production of small batches and multiple varieties. The main disadvantage of the spin forming method is that it can only produce rotary, symmetrical shell-shaped products, and the plasticity of the product is reduced, and the internal stress is large. Especially when welding the spinned products into an assembly, more attention should be paid.