Sheet forming die and method of helical cylinder gear

Abstract

The invention discloses a sheet forming die and method of a helical cylinder gear. The method comprises the following two major steps: 1) cold and precision forming of a sheet, namely, feeding a metal sheet to be processed between a first concave die and a first convex die, pressing a V-shaped ring blank holder into the metal sheet to be processed, pressing the first convex die into the metal sheet to be processed, keeping the first convex die and a reverse ejecting plate rotating at the same rate and in the same direction until the first convex die is in a certain distance from the first concave die so as to realize the cold and precision forming of the sheet; 2) rotating blanking, namely, blanking to remove the residues together with coating of the metal sheet subjected to the cold and precision forming, so as to obtain the helical cylinder gear. With the adoption of the sheet forming die and method, the cold and precision forming of the helical cylinder gear is realized, the corner collapse is reduced, the highlight zone is expanded, the part quality is improved, and the production cost is decreased.

Description

technical field [0001] The invention belongs to the field of helical cylindrical gear processing, and in particular relates to a sheet metal forming die and method for helical cylindrical gears. Background technique [0002] As an important transmission device, the helical spur gear is widely used in mechanical transmission and other fields. Compared with spur gears, helical gears have better transmission performance, and its compact center distance can be used for high-speed and heavy loads, and it has the characteristics of smooth meshing, low impact and low noise. At present, the most common processing method is cutting, followed by precision forging. The cutting method has disadvantages such as low material utilization rate, low production efficiency, and short gear life; the precision forging method has problems such as corner filling difficulties and strict requirements for mold design and manufacturing accuracy. As a high-quality, high-efficiency, low-consumption pr...

AI Technical Summary

Problems solved by technology

The cutting method has disadvantages such as low material utilization rate, low production efficiency, and short gear life; the precision forging forming method has problems such as corner filling difficulties, strict requirements for mold design and manufacturing accuracy, etc.

As a high-quality, high-efficiency, low-consumption precision forming technology, strong blanking fine blanking cannot be applied to the forming of helical cylindrical gears with a certain helix angle due to the linear motion of the mold, which limits the application of fine blanking technology scope

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