Method and device for producing gear together with clamping means

Abstract

The invention relates to a method for producing at least one gear, in particular a helically toothed gear, wherein the gear is produced from a gear blank (20, 38, 50, 52, 62, 72, 80, 82, 84) pressed and sintered with an oversize in the region of the set of teeth (18), wherein the gear blank (20, 38, 50, 52, 62, 72, 80, 82, 84) has two opposite end faces and a circumference. In the method, the gear blank (20, 38, 50, 52, 62, 72, 80, 82, 84) is clamped in a clamping means (42). The gear blank (20, 38, 50, 52, 62, 72, 80, 82, 84) is compressed in the region of the oversize by means of the engagement of at least one circumferential tool (10, 28) having a set of mating teeth (12, 26) that engages with the set of teeth (18) of the gear blank (20, 38, 50, 52, 62, 72, 80, 82, 84), wherein the gear blank (20, 38, 50, 52, 62, 72, 80, 82, 84) is radially clamped over the circumference by the clamping means (42) at both end faces during the compression of the gear blank, wherein each individual tooth (56, 66) of the set of teeth (18) of the gear blank (20, 38, 50, 52, 62, 72, 80, 82, 84) is supported by the clamping means (42) substantially over the entire tooth height. In this way, the quality of the set of teeth can be improved. The invention further relates to a device and to a clamping means.

Description

Technical field [0001] The invention relates to a method for manufacturing at least one gear, a device for manufacturing at least one gear, and a clamping mechanism for the same. Background technique [0002] European patent EP 1 694 452 B1 describes a method for manufacturing gears. In order to avoid the lower bending fatigue strength in the area of ​​the tooth root and the lower wear resistance in the gear manufactured by the powder metallurgy method, it is known to compress the sintered powder of the gear in the side area and the root area Metallurgical blanks, thereby obtaining a largely pore-free surface layer, which significantly increases the allowable load capacity in the joint area of ​​the gear. The compression of the surface layer is achieved by at least one pressing tool in the form of a gear, which either has an external toothing portion that engages in the teeth of the powder metallurgy blank or has a tooth flank and pressing tool by which the powder metallurgy bla...

AI Technical Summary

Problems solved by technology

[0003] However, said method is not suitable for sufficiently supporting the ends of the teeth which are thinner in the direction of force to ensure sufficient compression and to prevent springback of the tooth ends when rolling gears with especially helical teeth

Due to the only elastic deformation during the recompression, the tooth flanks are staggered and thus lead to a reduction in the quality of the toothing or an increased hardness finish due to undesired additional machining allowances.

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