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Convex-angle type hobbing cutter and manufacturing method thereof

A hob and lobe technology, which is applied in the direction of manufacturing tools, gear tooth manufacturing tools, gear tooth manufacturing devices, etc., can solve the problem that the manufacturing method of lobe-type involute hobs cannot effectively guarantee SAP, Df and tooth root thickness at the same time and other problems, to achieve the effect of ensuring the bending strength of the design tooth root and the bending strength of the tooth root

Pending Publication Date: 2019-02-05
XIAN FASHITE AUTOMOBILE TRANSMISSION CO LTD
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing production method of the lobe-type involute hob cannot effectively guarantee the thickness of SAP, Df and dedendum at the same time, and to provide a lobe that calculates the design parameters according to the known gear parameter requirements. type hob, and the manufacturing method of the lobe type hob

Method used

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  • Convex-angle type hobbing cutter and manufacturing method thereof
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  • Convex-angle type hobbing cutter and manufacturing method thereof

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Embodiment Construction

[0061] Below in conjunction with accompanying drawing and specific embodiment the content of the present invention is described in further detail:

[0062] According to the generating principle of gear hobbing, the present invention adds a section of linear cutting edge parallel to the main cutting edge of the hob in the lobe structure of the hob, and completes most of the shape cutting of the transition curve by this section of straight line. The product processed by this kind of hob structure can keep the SAP, Df and tooth root thickness required by the gear design at the same time, and does not reduce the transition curve length of the product, so as to ensure that the tooth root bending strength of the gear does not decrease.

[0063] The upper end of the added straight cutting edge is tangent to the arc of the addendum, and the lower end extends to the position corresponding to the starting circle of the hobbing involute required by the product. Using this type of hob can...

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Abstract

The invention relates to a convex-angle type hobbing cutter and a manufacturing method thereof, and mainly aims to solve the problem that when the difference value between an SAP circle and a Df circle in gear parameters is too big, an existing convex-angle type hobbing cutter manufacturing method cannot effectively guarantee the thickness of SAP, Df and tooth roots. The convex-angle type hobbingcutter comprises a tooth tip circular arc, a linear cutting blade, a transition cutting blade and a main cutting blade arranged sequentially, wherein the linear cutting blade and the main cutting blade are arranged in parallel; and the linear cutting blade and the tooth tip circular arc are tangentially arranged. Meanwhile, the inventio further provides the convex-angle type hobbing cutter manufacturing method which comprises the steps of (1) acquiring known parameters of a gear; (2) calculating parameters of the convex-angle type hobbing cutter according to the parameters in the step (1); and(3) processing the convex-angle type hobbing cutter according to the parameters acquired through the step (2).

Description

technical field [0001] The invention relates to a hob technology, in particular to a lobe-shaped hob and a manufacturing method thereof. Background technique [0002] In the design of the lobe-type involute hob, the parameter design of the lobe part must at the same time ensure that the product has the hobbing involute starting circle diameter (SAP) and dedendum circle diameter (Df ) and root thickness. When the difference between SAP and Df required in the product parameters is too large, exceeding 20% ​​of the total tooth height, it is impossible to ensure SAP, Df and tooth root thickness at the same time according to the traditional hob manufacturing method. There are two commonly used compromise production methods: one such as figure 1 , figure 2 As shown, reduce the SAP diameter to ensure Df and tooth root thickness. This method will reduce the length of the product transition curve, increase the curvature, and increase the risk of stress concentration, which is inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23F21/16B23F5/20
CPCB23F5/20B23F21/16
Inventor 唐永鹏金伟峰杨平
Owner XIAN FASHITE AUTOMOBILE TRANSMISSION CO LTD
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