A 00cr22ni5mo3n lock ring processing method that can eliminate deformation and reduce material consumption

Abstract

The invention relates to a 00Cr22Ni5Mo3N lock ring processing method capable of eliminating deformation and reducing material consumption, belonging to the lock ring production process. Solution treatment, artificial aging treatment and machining, using the method of double-foot continuous forging for forging, using the three-fire rolling ring formed by the ring rolling machine, after the solution treatment and artificial aging treatment of the supersaturated solid solution inside the stainless steel, the final lock is obtained. Finished circle. Strictly control the heating temperature, heating rate and holding time of the billet in the forming process of the lock ring section steel, and control the temperature of the solution treatment and artificial aging treatment to reduce the deformation of the product; the lock ring is forged by the method of double-length continuous rolling. Cancel the welding process to reduce the deformation caused by welding and the waste of cutting materials; use the forming process of the ring rolling machine to make special spindle molds and mandrel molds, and roll out the beveled edges inside and outside the lock ring to reduce material waste.

Description

technical field [0001] The invention belongs to a production process of a lock ring, in particular to a process method for a 00Cr22Ni5Mo3N lock ring capable of eliminating deformation and reducing material consumption. Background technique [0002] In the present invention, the 00Cr22Ni5Mo3N lock ring is a component that cooperates with the flange connection, but in actual production, it is found that the 00Cr22Ni5Mo3N duplex stainless steel lock ring has two major problems. First, the lock ring is deformed: due to the characteristics of the lock ring itself, the diameter is large. , The height is small and the wall is thin. Because the height is too small, it is inconvenient for turning tools. Therefore, during production, the lock ring should be welded to a common steel blind plate for processing. However, during the processing process, the product size will change with time. After all processing is completed and the blind plate is cut, the size will change again, and ther...

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Problems solved by technology

[0008] 4. Unbalanced tightness of fixed tool clamps: for large-diameter thin-walled workpieces, if the clamps used to fix the workpiece are unevenly tightened, it will cause a certain amount of elastic deformation of the workpiece during processing. After the workpiece is processed, remove the clamp Tool, elastic deformation recovery, when the dimensional accuracy requirements of the workpiece are relatively strict, there will inevitably be unqualified dimensions

[0009] 5. Solution treatment stress: The temperature of the solution treatment 00Cr22Ni5Mo3N lock ring is 1050 ° C, and it is cooled rapidly in the water pool, that is, it is cooled to room temperature within 10 minutes at 1050 ° C. This process produces various ferrite phases inside the workpiece. There are many and complex internal tissues, which will inevitably produce a lot of stress, but there is no aging treatment after that, and it will take at least three months to be completely released only by natural aging. Deformation occurs during the process, especially for such large-diameter thin-walled rings

[0011] 1. The forging temperature is unreasonable: the forging temperature of 00Cr22Ni5Mo3N is the same as that of ordinary carbon steel at 1200°C, and the stop forging temperature is also the same as that of ordinary carbon steel at 800-850°C, while duplex stainless steel will appear δ-phase ferrite above 1300°C , it is a brittle phase at high temperature, and α-phase ferrite will be precipitated at 950°C, which is a brittle phase at low temperature. If the temperature control is not accurate and the forging temperature is slightly higher or lower, the surface of the lock ring will appear. A large number of cracks, if there are cracks, only increase the machining allowance, and the material utilization rate will inevitably decrease

[0012] 2. The forging forming method is not suitable: the company produces the 00Cr22Ni5Mo3N lock ring by using a forging hammer to make a billet, and the forging hammer horse bar expands the hole to form, but because there is a bevel on the inside and outside of the lock ring, using this method can only make the product Forged into a cylindrical tube, the wall thickness of the finished product is relatively thin, and the material used for the two bevels on the inner and outer sides even exceeds the material used in the finished product, which greatly increases the consumption of materials

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