Continuous hobbing method for straight bevel gear

A straight-toothed bevel gear and processing method technology, which is applied to components with teeth, belts/chains/gears, gear teeth, etc., can solve the problem of not being able to meet the needs of flexible production and increasingly small batches of single pieces, Problems such as poor processing versatility and low processing accuracy

Active Publication Date: 2015-10-21
WUHAN UNIV OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Forging is only suitable for mass production, and cannot well meet the needs of flexible production and increasingly small batches of sin

Method used

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  • Continuous hobbing method for straight bevel gear
  • Continuous hobbing method for straight bevel gear
  • Continuous hobbing method for straight bevel gear

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Embodiment Construction

[0055] Such as figure 1 As shown, the basic principle of the present invention is based on a special hypocycloid approximating a straight line, and the cutter head is ω t The speed rotates, and the gear rotates at ω gThe speed of rotation, at this time the relative movement of the gear and the tool is equivalent to the tool rolling 1 (radius R v ) and gear rounding 7 (radius R g ) for pure rolling meshing motion. When the tool rounds 1 radius and the reference radius r v When consistent and equal to half the radius of the gear rolling circle 7, that is, R v = r v = R g / 2, the trajectory formed by the tip of the cutter tooth on the gear is an approximate straight line, which can be used for continuous hobbing of straight bevel gears.

[0056] In actual processing, since the cutter head, gear and number of teeth cannot strictly meet the above theoretical requirements, it is difficult to achieve an absolute straight line for the processed tooth profile. In fact, this abs...

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Abstract

The invention discloses a continuous hobbing method for a straight bevel gear. The continuous hobbing method is based on a special hypocycloid approximating a straight line. A cutterhead rotates at the speed being omega t, a gear rotates at the speed being omega g, and at the moment, relative movement of the gear and a cutter is equivalent to pure rolling engagement movement of cutter rolling and gear rolling. When the rolling radius and the reference radius of the cutter are the same or equal to one half of the gear rolling radius, the track formed by cutter noses of cutter teeth on the gear is an approximate straight line, and therefore the cutter and the gear can be used for continuous hobbing of the straight bevel gear. The continuous hobbing method has the advantages that the continuous hobbing technology is adopted, and therefore production efficiency and precision are high; both wet hobbing and dry hobbing can be achieved, the dry hobbing efficiency is higher, the tooth surface finish degree is better, the requirement for the cutter and a machine tool is higher, and wet hobbing just gets the opposite results; the machined straight bevel gear is in a slight drum shape instead of a strict straight line shape in the tooth length direction. The drum-shaped size can be controlled by adjusting machine tool parameters, so that the contact area of the gear is changed to enable the gear to have the better transmission performance, and gears with constant-depth teeth and shrinkage teeth can be machined.

Description

technical field [0001] The invention relates to a processing method of a straight bevel gear, in particular to a continuous hobbing processing method of a straight bevel gear. Background technique [0002] Straight bevel gears are widely used in various industries due to their advantages of convenient design and installation and good transmission performance. The current processing methods include forging, gear planing, double cutter head milling and so on. [0003] Forging is only suitable for mass production, and cannot well meet the needs of flexible production and increasingly small batches of single pieces. Gear planing process and double-cutter milling have low processing efficiency, low processing accuracy, and poor processing versatility. Therefore, there is an urgent need for a processing method with high processing efficiency and good versatility. Contents of the invention [0004] The purpose of this invention is to provide a milling process for straight beve...

Claims

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Application Information

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IPC IPC(8): B23F5/24
Inventor 华林郑方焱韩星会
Owner WUHAN UNIV OF TECH
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