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Pre-grinding hob for machining micro-segment gears

A micro-segment and gear technology, which is applied in the direction of gear tooth manufacturing tools, components with teeth, metal processing equipment, etc., can solve the problem of inability to ensure the smooth connection between the contact section of the micro-segment gear tooth profile and the arc of the addendum, and the inability to adapt Problems such as pre-grinding of micro-segment gears and inability to produce undercuts

Inactive Publication Date: 2014-02-05
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pre-grinding hob currently used to process conventional involute gears does not match the profile of the micro-segment gear because the shape of the cutting edge does not match the tooth profile of the micro-segment gear. In addition, the micro-segment gear hob proposed in the Chinese patent CN200820034342. No grinding allowance is left, proper undercutting cannot be produced, and the smooth connection between the contact section of the tooth profile of the micro-segment gear and the arc of the addendum cannot be guaranteed after grinding, and it is not suitable for the pre-grinding processing of the micro-segment gear

Method used

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  • Pre-grinding hob for machining micro-segment gears
  • Pre-grinding hob for machining micro-segment gears
  • Pre-grinding hob for machining micro-segment gears

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0161] Table 3 Parameters of processed micro-segment gears

[0162] Modulus / mm

Number of teeth

Initial pressure angle / degree

Pressure angle increment / degree

Initial base circle / mm

Addendum height factor

Headspace coefficient

3

30

10.6

0.00085

818611.14

1.05

0.375

[0163] It is assumed that the basic parameters of the micro-segment gear to be processed are shown in Table 3 above.

[0164] Such as figure 1 As shown, the pre-grinding hob used for micro-segment gear processing, the base cylinder of the pre-grinding hob is evenly distributed with cutter teeth, and each cutter tooth is respectively provided with a rake face 1, a top edge 2, and a right edge 3. The left side edge 4, the back of the back shovel top 5, the right side flank 6 and the left side flank 7, in which the right side 3 and the left side 4 are the main cutting edges, and the top side 2 and the flanks on both sides There are characteristic...

Embodiment 2

[0176] Table 5 Parameters of processed micro-segment gears

[0177] Modulus / mm

Number of teeth

Initial pressure angle / degree

Pressure angle increment / degree

Initial base circle / mm

Addendum height factor

Headspace coefficient

2.0

23

10.329

0.00065

796385.14

1.0

0.25

[0178] It is assumed that the basic parameters of the micro-segment gear to be processed are shown in Table 5 above.

[0179] Table 6 Hob parameters before grinding

[0180]

[0181] The parameters of the correspondingly designed pre-grinding hob are shown in Table 6 above.

Embodiment 3

[0183] Table 7 Parameters of processed micro-segment gears

[0184] Modulus / mm

Number of teeth

Initial pressure angle / degree

Pressure angle increment / degree

Initial base circle / mm

Addendum height factor

Headspace coefficient

1.15

19

10.178

0.000632

812568.32

1.0

0.25

[0185] It is assumed that the basic parameters of the micro-segment gear to be processed are shown in Table 7 above.

[0186] Table 8 Hob parameters before grinding

[0187]

[0188] The parameters of the correspondingly designed pre-grinding hob are shown in Table 8 above.

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Abstract

The invention relates to a pre-grinding hob for machining micro-segment gears. A cutting edge normal tooth profile of the pre-grinding hob comprises a main cutting edge segment, an addendum arc segment and a characteristic curve connecting segment, the main cutting edge segment is a normal engagement contacting tooth profile curve segment for machining the micro-segment gears, micro-segment curved lines or micro-segment straight lines are smoothly connected to form the main cutting edge segment, the length of the main cutting edge segment is not larger than 1 micrometer, the characteristic curve connecting segment is a connecting curve segment of a pre-grinding hob tooth addendum arc segment and a micro-segment tooth profile segment, and the trend and the length of the characteristic curve connecting segment are related to the modulus, the initial pressure angle, the pressure angle increment, the grinding allowance, the distribution form of the grinding allowance and the like of the micro-segment gears to be machined. The high-precision micro-segment gears can meet specific use requirements and mass production conditions as far as possible according to theoretical calculation and experience of the trends and the lengths of an undercutting arc segment and a characteristic transition curve segment.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing tools, and in particular relates to a pre-grinding hobbing tool for micro-segment gears, in particular to a hobbing tool for pre-grinding micro-segment gears with a hard tooth surface by adopting a forming grinding wheel grinding method. Background technique [0002] As an important transmission mode in mechanical transmission, gear transmission is widely used in practical engineering. Micro-segment gears (Patent No. ZL2004100656163.3) have better tooth root bending strength and tooth surface contact strength than involute gears, but because the tooth profile is different from ordinary involute tooth profiles, it cannot be processed by existing The method of involute gear is processed. In addition, the hob for micro-segment gears proposed in CN200820034342.5 utility model patent can only process micro-segment gears with general precision, and cannot be used for high-precision micro-...

Claims

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Application Information

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IPC IPC(8): B23F21/16
Inventor 黄康周志红赵韩刘鹏熊杨寿
Owner HEFEI UNIV OF TECH
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