Precise forming method for large and medium-sized hollow disc-shaped forgings with complex structures

Abstract

According to the precise forming method for the large and medium-sized hollow disc-shaped forge piece with the complex structure, the die forging pressure needed by the hollow disc-shaped forge piece with the complex structure is effectively reduced through the integrated forming technology of medium-frequency induction heating, free upsetting / ring rolling finishing cogging, die forging forming and waste heat correction; precise forming is achieved through the complex concave-convex structure of the disc face, and the mechanical property of a formed forging is excellent. The method is suitable for precise forming of large and medium-sized hollow disc-shaped forgings with complex structures.

Description

Technical Field

[0001] The present invention relates to a forming method, in particular to a precision forming method for large and medium-sized complex-structured hollow disk forgings. Background Art

[0002] For large and medium-sized complex-structured hollow disk forgings, traditional forming methods often adopt segmented forging and finally welding into a whole ring. However, this method is prone to causing deformation of the disk blank and welding defects, and is likely to undergo aging behaviors such as fracture under alternating stress or harsh working conditions, affecting the service life and safety of equipment. The patent document with the publication number CN 200910102905.9 discloses a rolling and cutting forming method for large and medium-sized stainless steel hollow disk forgings. This method first upsets, shapes, and punches a stainless steel bar into a hollow disk blank, and then installs the disk blank into a rolling mill for rolling forming. This method can effectively eliminate defects such as overheating, burning, and microstructure variation during the rolling process of stainless steel hollow disk forgings, and prevent defects such as incomplete filling of the ring angle, effectively improving the production efficiency of stainless steel hollow disk forgings. However, this method is only applicable to hollow disk-shaped parts without special structures on the disk surface. For the integrated production process of large and medium-sized hollow disk forgings with complex convex structures on the disk surface, there is no such mature technology in our country. Therefore, it is necessary to propose a method that can effectively reduce the die forging pressure required for complex-structured hollow disk-shaped parts, achieve precision forming of complex concave and convex structures on the disk surface, and the forged parts have excellent mechanical properties after forming. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a precision forming method for large and medium-sized complex-structured hollow disk forgings. Through the integrated forming technology of "medium-frequency induction heating - free upsetting / ring rolling finishing for blanking - die forging forming - residual heat correction", the die forging pressure required for complex-structured hollow disk-shaped parts can be effectively reduced, the complex concave and convex structures on the disk surface can be precisely formed, and the forged parts have excellent mechanical properties after forming.

[0004] To solve the above technical problem, the technical solution of the precision forming method for large and medium-sized complex-structured hollow disk forgings of the present invention includes the following steps:

[0005] Step 1: Heat the bar blank to 1050°C to 1250°C using medium-frequency induction heating, and use a process combining free upsetting and punching to prepare the blank, with the final forging temperature being 950°C to 1150°C;

[0006] Step 2: Perform diameter-axial ring rolling finishing on the blank obtained in Step 1, with the working temperature being 1050°C to 1150°C;

[0007] Step 3: Perform surface shot peening on the blank obtained in Step 2, heat it to 1000°C - 1200°C by medium-frequency induction heating, and perform net forming by die forging. The final forging temperature is 900°C - 1150°C;

[0008] Step 4: Use the forging residual heat to flatten and straighten the forging obtained in Step 3, and perform secondary processing through micro forging and pressing to generate strain hardening to improve the mechanical properties of the forging, thereby obtaining a large and medium-sized complex-structured hollow disk-shaped forging.

[0009] In particular, one side of the disk surface of the complex-structured hollow disk-shaped forging is provided with a complex convex rib structure.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0011] In the precision forming method of the large and medium-sized complex-structured hollow disk-shaped forging of the present invention, the upsetting / ring rolling finishing and blanking are matched with die forging forming. The hollow disk-shaped blank can significantly reduce the required pressure tonnage for die forging forming, improve the forming efficiency of the complex structure on the disk surface, and significantly reduce the equipment investment and production cost. Specific Embodiments

[0012] Implementing the precision forming method of the large and medium-sized complex-structured hollow disk-shaped forging of the present invention includes the following steps:

[0013] Step 1: Heat the bar blank to 1050°C - 1250°C by medium-frequency induction heating, and perform blanking by using a process combining free upsetting and punching. The final forging temperature is 950°C - 1150°C;

[0014] Step 2: Perform diameter-axial ring rolling finishing on the blank obtained in Step 1, and the working temperature is 1050°C - 1150°C;

[0015] Step 3: Perform surface shot peening on the blank obtained in Step 2, heat it to 1000°C - 1200°C by medium-frequency induction heating, and perform net forming by die forging. The final forging temperature is 900°C - 1150°C;

[0016] Step 4: Use the forging residual heat to flatten and straighten the forging obtained in Step 3, and perform secondary processing through micro forging and pressing to generate strain hardening to improve the mechanical properties of the forging, thereby obtaining a complex-structured hollow disk-shaped forging.

[0017] In particular, one side of the disk surface of the complex-structured hollow disk-shaped forging is provided with a complex convex rib structure.

Claims

1. A precision forming method for large and medium-sized complex structure hollow disk-shaped forgings, characterized in that, Including the following steps: Step 1: Heat the bar blank to 1050°C - 1250°C using medium-frequency induction heating, and perform blank making by the combined process of free upsetting and punching. The final forging temperature is 950°C - 1150°C; Step 2: Perform radial-axial ring rolling finishing on the blank obtained in Step 1, with the working temperature being 1050°C - 1150°C; Step 3: Perform surface shot peening on the blank obtained in Step 2, heat it to 1000°C - 1200°C using medium-frequency induction heating, and perform net forming by die forging. The final forging temperature is 900°C - 1150°C; Step 4: Use the forging residual heat to flatten and straighten the forging obtained in Step 3, and perform secondary processing through micro forging and pressing to generate strain hardening to improve the mechanical properties of the forging, thereby obtaining a large and medium-sized complex structure hollow disc-shaped forging with a complex structure.

2. The precision forming method of the large and medium-sized complex structure hollow disc-shaped forging according to claim 1, characterized in that, One side of the disc surface of the complex structure hollow disc-shaped forging is provided with a complex raised rib structure.