CN1932707A - Involute straight-teeth conical gear shaping method - Google Patents
Involute straight-teeth conical gear shaping method Download PDFInfo
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- CN1932707A CN1932707A CN 200610124642 CN200610124642A CN1932707A CN 1932707 A CN1932707 A CN 1932707A CN 200610124642 CN200610124642 CN 200610124642 CN 200610124642 A CN200610124642 A CN 200610124642A CN 1932707 A CN1932707 A CN 1932707A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000010862 gear shaping Methods 0.000 title claims description 10
- 230000004048 modification Effects 0.000 claims abstract description 27
- 238000012986 modification Methods 0.000 claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 238000012937 correction Methods 0.000 claims description 28
- 238000005242 forging Methods 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 3
- 125000000174 L-prolyl group Chemical group [H]N1C([H])([H])C([H])([H])C([H])([H])[C@@]1([H])C(*)=O 0.000 claims description 2
- 230000009471 action Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 11
- 238000012545 processing Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000003754 machining Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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Abstract
渐开线直齿圆锥齿轮修形方法，属于齿轮的制造方法，克服现有技术的不足，直接通过数控机床加工出修形后的齿轮，不需要再对齿轮进行后续加工。其步骤是：采用三维造型CAD软件建立齿轮理论渐开线；确定齿向鼓形量和齿廓最大修形量；对共轭齿轮中的任意一个齿轮进行齿向修形，共轭齿轮中另一个齿轮齿向不修形；对上述共轭齿轮三维模型都进行齿廓修形；将修形三维齿轮模型转化为数控代码输入数控机床，由数控机床将毛坯直接加工。本发明可简化传统的圆锥齿轮加工成形方法，降低圆锥齿轮副啮合过程中的振动和噪声，同时减少载荷集中或者消除由于一对啮合的齿轮齿宽不等而造成的棱边效应。
The invention relates to a method for modifying an involute spur bevel gear, which belongs to a gear manufacturing method, overcomes the shortcomings of the prior art, and directly processes the modified gear through a numerical control machine tool without further processing the gear. The steps are: use the three-dimensional modeling CAD software to establish the theoretical involute of the gear; determine the crowning amount of the tooth direction and the maximum modification amount of the tooth profile; modify the tooth direction of any gear in the conjugate gear, and modify the tooth direction of the other gear in the conjugate gear. The tooth direction of one gear is not modified; the three-dimensional model of the above-mentioned conjugate gear is modified; the modified three-dimensional gear model is converted into numerical control code and input into the CNC machine tool, and the blank is directly processed by the CNC machine tool. The invention can simplify the traditional bevel gear machining and forming method, reduce the vibration and noise during the meshing process of the bevel gear pair, reduce the load concentration or eliminate the edge effect caused by the unequal tooth width of a pair of meshing gears.
Description
Technical field
The invention belongs to the manufacture method of gear, particularly involute straight-teeth conical gear shaping method.
Background technology
The flank of tooth of working standard gear is theoretical involute urve, because elastic deformation or local elasticity's distortion make actual mesh tooth face depart from theoretical involute urve, causes producing vibration and noise thus when engagement; In addition, because gear pair can't avoid producing error when processing and installation, be difficult to guarantee dimensional accuracy and installation accuracy, can cause the mesh regional of gear pair not to be in the middle part of the flank of tooth, also have the gear tooth width of pair of meshing not wait, produce the seamed edge effect, also directly influence the raising and the serviceable life of gear capacity.By gear modification, convex shape is accomplished at the middle part of the flank of tooth, mesh regional just can be in the middle part of the flank of tooth.
The job operation of traditional spur bevel gear mainly adopts gear shaper to obtain by mach method, or process the gear electrode by gear shaper and make gear die with electrode then, at last blank is adopted the method for forging to produce gear in gear die.Gear shaper is difficult to process the correction of the flank shape conical gear.Said method all needs the gear of completion of processing is carried out following process again, could realize correction of the flank shape.The methods of mending gear of publication number CN1480291A is applied on the straight spur gear, and this method is to process theoretical gear part earlier, adopts the method for rolling, shaving or grinding to repair drum then on the basis of the part that has processed.Publication number CN85102760B carries out the galvanic corrosion correction of the flank shape to the harmonic gear part that has processed.
The methods of mending gear of publication number CN1614526 then is directly to processing the gear of repairing behind the drum by numerically-controlled machine, and does not need again gear to be carried out following process.This method is that 2 gears are all repaiied drum aspect teeth directional, and this brings great difficulty can for the processing of repairing drum gear.Profile modification is to revise theoretical involute urve with the means of spline-fitting on the back cone plane of conical gear, and does not adopt theoretical involute urve, and this is little for modulus, the car spur bevel gear that contour dimension is little, out of true, and correction method complexity do not have parametrization yet.
Summary of the invention
The invention provides a kind of involute straight-teeth conical gear shaping method, overcome the deficiencies in the prior art, directly process gear after the correction of the flank shape, and do not need again gear to be carried out following process by numerically-controlled machine.Radius arc correction of the flank shape, flank profils such as teeth directional of the present invention is are the tooth top correction of the flank shape, and promptly gear teeth is the tooth top correction of the flank shape to radius arc shape, flank profil such as accomplishing, another gear teeth that is meshed to do not practice Buddhism or Taoism, only flank profil is carried out the tooth top correction of the flank shape.
A kind of involute straight-teeth conical gear shaping method of the present invention comprises the steps:
(1) adopt earlier 3D sculpting software to set up the theoretical involute urve of the different spur bevel gear of two spherical radius, as theoretical involute urve of big end and the theoretical involute urve of small end;
(2) determine the maximum profiling quantity of teeth directional cydariform amount and flank profil: teeth directional cydariform amount is 10≤C by iso standard
c≤ 40um, manufacturing tolerance 5um; By the AGMA standard is 5≤C
c≤ 25um, manufacturing tolerance 5um;
The maximum profiling quantity of flank profil is 20～40um;
(3) the theory locus line of any one gear in the conjugate tooth carries out axial modification, and another gear teeth is to not correction of the flank shape in the conjugate tooth; Two theoretical involute urves of axial modification gear rotate around central gear axis respectively, sense of rotation is a deflection gear teeth entities, the anglec of rotation is determined according to teeth directional cydariform amount, radius arc such as then the initial end points of two postrotational curves of theoretical involute urve is linked to be, as sweep trace, teeth directional cydariform amount 10～40um;
(4) the theoretical involute urve of profile modifying gear carries out variable cross section scanning along sweep trace and obtains the flank of tooth, thereby obtains axial modification gear three-dimensional model; Teeth directional not two starting points of two theoretical involute urves of profile modifying gear to be linked to be straight line be the theory locus line, obtain the theoretical flank of tooth of spur bevel gear along the theory locus line sweep, obtain the not theoretical spur bevel gear three-dimensional model of profile modifying gear by this theory flank of tooth;
(5) above-mentioned conjugate tooth three-dimensional model all carries out profile modification: promptly the theoretical involute urve of conjugate tooth is carried out correction of the flank shape near tooth top, with cut-point two theoretical involute urves of each gear all are divided into two partly, cut-point is that bidentate is to being engaged to the transfer point of monodentate to engagement, curved portion near tooth top is rotated around cut-point, sense of rotation deflection wheel body is determined the anglec of rotation according to the maximum profiling quantity of flank profil; The face of forming near the postrotational curve of the curved portion of tooth top with theoretical involute urve of big end and the theoretical involute urve of small end partly removes the gear entity to the outside, obtains the axial modification and the profile modification entity three-dimensional model of spur bevel gear;
(6) the three-dimensional model of gear of correction of the flank shape is converted into numerical control code input numerically-controlled machine, blank directly is processed into gear, the gear electrode after the correction of the flank shape or is used for the gear die of forging and molding by numerically-controlled machine.
Described involute straight-teeth conical gear shaping method is characterized in that: described theoretical involute urve is a spherical involute, and its equation is:
In the formula: l-gear start radius; θ-cone generating angle; Angle on -field of conjugate action between initial segment and the instantaneous revolving shaft is zero for the initial point of involute urve on the base cone;
When using iso standard, to high precision, the described teeth directional cydariform of the high speed power gear transmission amount of high reliability is 10≤C
c≤ 25um, manufacturing tolerance 5um.
Described involute straight-teeth conical gear shaping method is characterized in that: described three-dimensional modeling CAD software is Pro/Engineer, UG or CATIA.
The present invention directly obtains the model of gear of parametrization correction of the flank shape in 3D sculpting software, only need to revise parameter: cydariform amount, the maximum profiling quantity of flank profil, cut-point position, spherical radius, number of teeth or the like just can generate a pair of model of gear of correction of the flank shape.After the correct assembling, the flank of tooth of a pair of gear is tangent, illustrates that model is correct in the CAD modeling software, because be spur bevel gear, the flank of tooth of the gear of pair of meshing is tangent.The gear that processes by numerically-controlled machine behind the generation numerical control code just has been the gear after the correction of the flank shape, and do not need again gear to be carried out following process, be used for the shaping of Involute Straight-teeth Bevel Gear, gear electrode and gear die of correction of the flank shape, can solve the problems such as engagement contact, noise and vibrations reduction of conical gear.
Description of drawings
Fig. 1 is theoretical involute urve and theoretical sweep trace.
Fig. 2 represents the theoretical flank of tooth that obtains with the variable cross section method.
Fig. 3 represents pair of engaged gears axial modification synoptic diagram.
Its separated into two parts of naming a person for a particular job on Fig. 4 representation theory involute urve.
Fig. 5 is the theoretical involute urve rotation of a tooth top synoptic diagram.
Fig. 6 is a gear teeth tips correction of the flank shape enlarged diagram.
Embodiment
As Fig. 1-shown in Figure 2, the theoretical involute urve 1 of big end, the theoretical involute urve starting point 2 of big end, the theoretical involute urve 4 of small end, the theoretical involute urve starting point 5 of small end, the straight line that big end and the same direction starting point 2,5 of the theoretical involute urve of small end are linked to be is a theory locus line 3, any theoretical involute urve is as initial track (Origin Trajectory), an other theoretical involute urve obtains the theoretical flank of tooth 6 as control track (X-Trajectory) with the variable cross section scan method.
As shown in Figure 3, the theory locus line of any one gear in the conjugate tooth is carried out axial modification, another gear teeth is to not correction of the flank shape in the conjugate tooth; Two theoretical involute urves of axial modification gear are respectively around central gear axis 11 rotations, sense of rotation is a deflection gear teeth entities, the anglec of rotation is determined according to teeth directional cydariform amount, radius arc such as then the initial end points of two postrotational curves of theoretical involute urve is linked to be, as sweep trace, teeth directional cydariform amount 30～40um; These radius arc curves are sweep traces 8; Cydariform amount 7; Curve 9 after the theoretical involute urve rotation of big end; Curve 10 after the theoretical involute urve rotation of small end; Central gear axis 11; Gear teeth end face 12; The entity 13 that teeth directional cuts.
As shown in Figure 4, theoretical involute urve 1 with the big end of gear is an example, with cut-point 14 two theoretical involute urves of each gear all are divided into two partly, cut-point is that bidentate is to being engaged to the transfer point of monodentate to engagement, as shown in Figure 5, part 16 below the part 15 above the theoretical involute urve cut-point, theoretical involute urve cut-point; Curved portion near tooth top is rotated, sense of rotation deflection wheel body, the curve 17 after the partial rotation above the theoretical involute urve cut-point, the angle 18 that the part above the theoretical involute urve cut-point is rotated around cut-point.As shown in Figure 6, the face of forming near the postrotational curve of the curved portion of tooth top with theoretical involute urve of big end and the theoretical involute urve of small end partly removes the gear entity to the outside, the maximum profiling quantity 19 of flank profil, correction of the flank shape normal direction length 20 obtains the axial modification and the profile modification entity three-dimensional model of spur bevel gear.
With spur bevel gear used on the car differential mechanism is example, and the gear wheel number of teeth is 14, and the pinion wheel number of teeth is 10; Pressure angle is 22.5 °; Start radius is 34mm; θ-cone generating angle: pinion wheel is 35.5377 °, and gear wheel is 54.4623 °; Parametric modeling in three-dimensional modeling CAD software Pro/E.Carry out axial modification earlier, teeth directional is repaiied drum; Carry out profile modification then, tooth top is repaiied exterior feature.
With pinion gear teeth to repair drum be flank profil repair the top and not correction of the flank shape of gear wheel teeth directional flank profil is repaiied the top, the big end spherical involute of pinion wheel equation is:
Pinion wheel small end spherical involute equation is:
Teeth directional is repaiied drum: draw the flank of tooth by the variable cross section scan method, radius arc such as scanning pattern is, two theoretical involute urves of axial modification pinion wheel rotate around central gear axis respectively, sense of rotation is a deflection gear teeth entities, the anglec of rotation determines that according to teeth directional cydariform amount the teeth directional cydariform is measured and is 20um.Radius arc such as then the initial end points of two postrotational curves of theoretical involute urve is linked to be, as sweep trace; These radius arc curves are sweep traces.The scanning pattern of the gear wheel of not correction of the flank shape of teeth directional is a straight line.Determining of cydariform center, pinion wheel is repaiied the centre that bulging cydariform center is selected at the facewidth; Teeth directional is repaiied bulging definite principle: topmost purpose is to guarantee that the end points contact does not take place gear intermeshing gear teeth under the condition of maximum engagement skewness---tangent and do not cut mutually, reduce the seamed edge effect; Also should guarantee simultaneously under the situation that does not tilt or tilt on a small quantity, reduce the load on the unit tooth length to greatest extent.
Profile modification:, only need tooth top correction of the flank shape to a pair of conjugate tooth for ease of profile modification.Cut-point is that bidentate holds the cut-point on the theoretical involute urve to be divided into 2 sections greatly to being engaged to the transfer point of monodentate to engagement, using, and rotates around cut-point near tip curve, and sense of rotation is towards the gear teeth, and the profiling quantity of flank profil maximum is 30um; Be divided into 2 sections with the cut-point on the theoretical involute urve of small end, around a rotation, sense of rotation is towards the gear teeth near tip curve, and the profiling quantity of flank profil maximum is 30um; To form faces near two curves of the rotation of tooth top the gear-profile profiling quantity will be cut away, thereby obtain the gear of axial modification and profile modification.
At last, to in 3D sculpting software, construct complete spur bevel gear correction of the flank shape figure, be converted into numerical control code and be input in the numerically-controlled machine, blank directly is processed into the gear die of repairing gear, the gear electrode after rousing or being used for forging and molding by numerically-controlled machine.
Claims (3)
1. an involute straight-teeth conical gear shaping method comprises the steps:
(1) at first adopt 3D sculpting software to set up the theoretical involute urve of the different spur bevel gear of two spherical radius, as theoretical involute urve of big end and the theoretical involute urve of small end;
(2) determine the maximum profiling quantity of teeth directional cydariform amount and flank profil: teeth directional cydariform amount is 10≤C by iso standard
c≤ 40um, manufacturing tolerance 5um; By the AGMA standard is 5≤C
c≤ 25um, manufacturing tolerance 5um; The maximum profiling quantity of flank profil is 20～40um;
(3) the theory locus line to any one gear in the conjugate tooth carries out axial modification, and another gear teeth is to not correction of the flank shape in the conjugate tooth; Two theoretical involute urves of axial modification gear rotate around central gear axis respectively, sense of rotation is a deflection gear teeth entities, the anglec of rotation is determined according to teeth directional cydariform amount, radius arc such as then the initial end points of two postrotational curves of theoretical involute urve is linked to be, as sweep trace, teeth directional cydariform amount 30～40um;
(4) the theoretical involute urve of profile modifying gear is carried out variable cross section scanning along sweep trace and obtain the flank of tooth, thereby obtain axial modification gear three-dimensional model; Teeth directional not two starting points of two theoretical involute urves of profile modifying gear to be linked to be straight line be the theory locus line, obtain the theoretical flank of tooth of spur bevel gear along the theory locus line sweep, obtain the not theoretical spur bevel gear three-dimensional model of profile modifying gear by this theory flank of tooth;
(5) above-mentioned conjugate tooth three-dimensional model is all carried out profile modification: promptly the theoretical involute urve of conjugate tooth is carried out correction of the flank shape near tooth top, with cut-point two theoretical involute urves of each gear all are divided into two partly, cut-point is that bidentate is to being engaged to the transfer point of monodentate to engagement, curved portion near tooth top is rotated around cut-point, sense of rotation deflection wheel body is determined the anglec of rotation according to the maximum profiling quantity of flank profil; The face of forming near the postrotational curve of the curved portion of tooth top with theoretical involute urve of big end and the theoretical involute urve of small end partly removes the gear entity to the outside, obtains the axial modification and the profile modification entity three-dimensional model of spur bevel gear;
(6) the three-dimensional model of gear of correction of the flank shape is converted into numerical control code input numerically-controlled machine, blank directly is processed into gear, the gear electrode after the correction of the flank shape or is used for the gear die of forging and molding by numerically-controlled machine.
2. involute straight-teeth conical gear shaping method as claimed in claim 1 is characterized in that: described theoretical involute urve is a spherical involute, and its equation is:
In the formula: l-gear start radius; θ-cone generating angle; Angle on -field of conjugate action between initial segment and the instantaneous revolving shaft is zero for the initial point of involute urve on the base cone;
When using iso standard, to high precision, the described teeth directional cydariform of the high speed power gear transmission amount of high reliability is 10≤C
c≤ 25um, manufacturing tolerance 5um.
3. involute straight-teeth conical gear shaping method as claimed in claim 1 or 2 is characterized in that: described three-dimensional modeling CAD software is Pro/Engineer, UG or CATIA.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101246428A CN100414464C (en) | 2006-09-27 | 2006-09-27 | Modification method of involute straight bevel gear |
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|---|---|---|---|
| CNB2006101246428A CN100414464C (en) | 2006-09-27 | 2006-09-27 | Modification method of involute straight bevel gear |
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| CN1932707A true CN1932707A (en) | 2007-03-21 |
| CN100414464C CN100414464C (en) | 2008-08-27 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100462190C (en) * | 2007-04-06 | 2009-02-18 | 中国计量学院 | The modification method of the external thread of the clamping jaw of the drill chuck |
| CN101937211A (en) * | 2010-07-08 | 2011-01-05 | 济南大学 | Modification method of involute straight bevel gear |
| CN103034751A (en) * | 2012-11-09 | 2013-04-10 | 济南大学 | Method for conveniently realizing variable curvature accurate drum correcting of parameterized involute straight bevel gear |
| CN103440371A (en) * | 2013-08-22 | 2013-12-11 | 江苏森威精锻有限公司 | Method for modifying forging tooth profile |
| CN106704543A (en) * | 2016-12-05 | 2017-05-24 | 贵州群建精密机械有限公司 | Method for reducing noise of engine by shaping timing gear of engine |
| CN108679196A (en) * | 2018-07-23 | 2018-10-19 | 江苏太平洋齿轮传动有限公司 | A kind of spherical involute straight bevel gear is secondary and its profile modification method |
| CN108953549A (en) * | 2018-08-01 | 2018-12-07 | 中南大学 | The modification design method of spur gear surface |
| CN109238200A (en) * | 2018-09-12 | 2019-01-18 | 中国航发哈尔滨东安发动机有限公司 | A method of detection bevel gear root bores parameter |
| WO2020020074A1 (en) * | 2018-07-23 | 2020-01-30 | 江苏太平洋精锻科技股份有限公司 | Straight bevel gear pair and axial modification method therefor |
| CN113798602A (en) * | 2021-09-26 | 2021-12-17 | 大连理工大学 | Method for machining crowned profile modification teeth based on large-plane grinding wheel gear grinding machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3484879B2 (en) * | 1995-06-05 | 2004-01-06 | 株式会社豊田中央研究所 | Gear design method, gear and gear measurement method |
| US6602115B2 (en) * | 2001-01-03 | 2003-08-05 | The Boeing Company | Tool and method for precision grinding of a conical face gear that meshes with a conical involute pinion |
| CN1480291A (en) * | 2003-06-28 | 2004-03-10 | 贵州群建齿轮有限公司 | Method for modifying shape of involute gear |
| CN1614526A (en) * | 2004-11-18 | 2005-05-11 | 华中科技大学 | Method for profiling involute straight teeth conical gear |
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2006
- 2006-09-27 CN CNB2006101246428A patent/CN100414464C/en not_active Expired - Fee Related
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100462190C (en) * | 2007-04-06 | 2009-02-18 | 中国计量学院 | The modification method of the external thread of the clamping jaw of the drill chuck |
| CN101937211A (en) * | 2010-07-08 | 2011-01-05 | 济南大学 | Modification method of involute straight bevel gear |
| CN101937211B (en) * | 2010-07-08 | 2012-06-27 | 济南大学 | Involute straight tooth cone gear trimming method |
| CN103034751A (en) * | 2012-11-09 | 2013-04-10 | 济南大学 | Method for conveniently realizing variable curvature accurate drum correcting of parameterized involute straight bevel gear |
| CN103034751B (en) * | 2012-11-09 | 2015-09-16 | 济南大学 | One is convenient to realize parameterized involute bevel gears variable curvature and is accurately repaiied bulging method |
| CN103440371A (en) * | 2013-08-22 | 2013-12-11 | 江苏森威精锻有限公司 | Method for modifying forging tooth profile |
| CN103440371B (en) * | 2013-08-22 | 2016-02-24 | 江苏森威精锻有限公司 | A kind of forging flank profil correction method |
| CN106704543B (en) * | 2016-12-05 | 2019-04-02 | 贵州群建精密机械有限公司 | A method of by reducing engine noise to engine timing gear correction of the flank shape |
| CN106704543A (en) * | 2016-12-05 | 2017-05-24 | 贵州群建精密机械有限公司 | Method for reducing noise of engine by shaping timing gear of engine |
| CN108679196A (en) * | 2018-07-23 | 2018-10-19 | 江苏太平洋齿轮传动有限公司 | A kind of spherical involute straight bevel gear is secondary and its profile modification method |
| WO2020019625A1 (en) * | 2018-07-23 | 2020-01-30 | 江苏太平洋精锻科技股份有限公司 | Spherical involute spur bevel gear pair and method for reshaping gear profile thereof |
| WO2020020074A1 (en) * | 2018-07-23 | 2020-01-30 | 江苏太平洋精锻科技股份有限公司 | Straight bevel gear pair and axial modification method therefor |
| CN108679196B (en) * | 2018-07-23 | 2020-10-16 | 江苏太平洋齿轮传动有限公司 | Spherical involute straight-tooth bevel gear pair and tooth profile modification method thereof |
| CN108953549A (en) * | 2018-08-01 | 2018-12-07 | 中南大学 | The modification design method of spur gear surface |
| CN109238200A (en) * | 2018-09-12 | 2019-01-18 | 中国航发哈尔滨东安发动机有限公司 | A method of detection bevel gear root bores parameter |
| CN109238200B (en) * | 2018-09-12 | 2021-04-27 | 中国航发哈尔滨东安发动机有限公司 | Method for detecting bevel gear root cone parameters |
| CN113798602A (en) * | 2021-09-26 | 2021-12-17 | 大连理工大学 | Method for machining crowned profile modification teeth based on large-plane grinding wheel gear grinding machine |
| CN113798602B (en) * | 2021-09-26 | 2023-10-13 | 大连理工大学 | Processing method of drum-shaped modification teeth based on tooth profile of large-plane grinding wheel tooth grinding machine |
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