A method for rough cutting with step feed of herringbone gear with narrow empty sipes

A technology of herringbone gears and empty knife grooves, which is applied in the directions of belts/chains/gears, gear teeth, components with teeth, etc., can solve the problems of poor tooth surface accuracy and low processing efficiency of herringbone gears, and achieves the scope of application. Wide, improve processing efficiency, reduce the effect of manufacturing cost

Active Publication Date: 2022-04-22
XI AN JIAOTONG UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of low processing efficiency and poor tooth surface precision of herringbone gears in the prior art, and provide a step-feed rough cutting method for herringbone gears with narrow and empty sipe

Method used

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  • A method for rough cutting with step feed of herringbone gear with narrow empty sipes
  • A method for rough cutting with step feed of herringbone gear with narrow empty sipes
  • A method for rough cutting with step feed of herringbone gear with narrow empty sipes

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Embodiment

[0069] Gear parameters: number of teeth z=34, modulus m=10mm, pressure angle α=20°, helix angle β=34.5°, tooth width b=330mm, undercut width 30mm, normal tooth thickness S pn =14.08mm, graduation circle diameter d p =340mm, addendum circle diameter d a =360.122mm, involute starting diameter d f =328.067mm, rough machining allowance Δ f = 0.15 mm.

[0070] Determine the normal groove width of the rough cutting addendum of the herringbone gear:

[0071] 1) Alveolar half angle of base circle: σ b =1.561°

[0072] 2) Groove width in the normal direction of tooth top: S rdna '=19.612mm;

[0073] (2) Determine the rough cutting normal groove width of the starting point of the tooth root involute: S rdnf '=8.172mm

[0074] (3) Determine the number and diameter of rough cutting cylindrical end mill cutters:

[0075] Firstly, two benchmark values ​​d max =9.806mm, d min =4.085mm:

[0076] 1) Determine RT1 tool diameter d RT1 = 10mm;

[0077] 2) Determine RT3 tool diamete...

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Abstract

The invention discloses a step-feed rough cutting method of a herringbone gear with narrow empty sipes, belonging to the field of herringbone gear processing. A step-feed rough cutting method for a narrow empty sipe herringbone gear, comprising: 1) calculating the half-angle σ of the base circular tooth groove based on the parameters of the herringbone gear b ; 2) Based on σ b Calculate the normal slot width S of the tooth top of the herringbone gear rdna ′, and the normal slot width S of the starting point of the involute line of the herringbone gear rdnf '; 3) based on S rdna ' and S rdnf ’, select the rough cutting cylindrical end mill tool; 4) The tool is stepped into the tool along the radial direction of the gear, and the tool cuts along one side of the tooth groove in the tooth width direction and then returns along the other side of the tooth groove to complete a cutting cycle, that is, complete Single-layer cutting; repeat the step feed until the width of the rough cutting groove is smaller than the diameter of the tool, and complete the maximum cutting depth of the tool; use the tool for tooth division processing until all the tooth grooves are cut to the maximum cutting depth of the tool; replace the next tool Carry out cutting, the cutting method is the same as that of the last tool, until all the tools are cut and the rough cutting is completed.

Description

technical field [0001] The invention belongs to the field of herringbone gear processing, in particular to a step-feed rough cutting method of a herringbone gear with a narrow hollow sipe. Background technique [0002] The bearing capacity and motion stability of helical gears are significantly better than those of spur gears, but as the helix angle increases, the axial meshing force increases rapidly, so it is necessary to choose a larger size that can bear radial and axial forces at the same time. At the same time, the design of the box should consider the axial force and increase the ribs, etc., which will inevitably increase the weight of the transmission system, reduce the power density, and increase the cost. [0003] In order to overcome this shortcoming of the helical gear, the two gears with the opposite helix angle and the same parameters are connected together on the same axis, and used as a gear, which is called a herringbone gear. This kind of gear retains the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23F7/00
CPCB23F7/00
Inventor 郭文超毛世民
Owner XI AN JIAOTONG UNIV
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