Method and device for producing gear together with clamping means
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A clamping mechanism and gear technology, applied in gears, applications, household appliances, etc., can solve problems such as the quality reduction of teeth, and achieve the effects of ensuring positioning, reducing production costs, and reliable clamping
Active Publication Date: 2016-11-23
GKN POWDER METALLURGY ENG GMBH
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[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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[0045] figure 1 An exemplary rolling device is shown schematically. The first rolling tool 10 with the first toothing 12 is rotatably supported in the direction of rotation 16 about the first axis 14. During rolling, the direction of rotation can be changed once or multiple times. The first rotational orientation may also be indicated in a direction opposite to that shown. The first tooth part 12 is in engagement with the second tooth part 18 of the gear blank 20. The gear blank 20 is rotatably supported around the second axis 22. Accordingly, the second direction of rotation 24 is formed. In addition, the second tooth portion 18 is in engagement with the third tooth portion 26 of the second tool 28. The second tool 28 is rotatably supported along a third rotation direction 32 about a third axis 30. With this type of rolling equipment, for example, in the area of machining allowance, at least the surrounding tools 10 and 28 having mating teeth 12 and 26 engaged in the te...
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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...
Claims
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