CN104816047A - Face gear grinding tool design method - Google Patents

Abstract

The invention relates to a face gear grinding tool design method for prominently improving the face gear grinding efficiency and surface quality. A face gear grinding tool structure determination method determines a face gear shovel-shaped wheel tooth number based on a face gear spreading principle and a point contact surface gear transmission principle. A face gear grinding tool profile structure, a groove parameter and a spiral angle are determined according to a face gear shovel-shaped basic parameter, a face gear processing precision grade and a processing environment to design a face gear grinding tool engineering drawing. The invention builds one set of complete face gear grinding tool design method; a designed grinding tool can prominently improve the face gear grinding efficiency and surface quality, and adopts a steel-based electroplating CBN abrasive particle form to improve the grinding tool durability; and the technology lays the foundation for the processing of shape-corrected face gears.

Description

A kind of face gear grinding devising method of cutting tool

Technical field

The present invention relates to the technical field of gear grinding Tool Design, be specifically related to a kind of face gear grinding devising method of cutting tool, be applicable to the design of special grinding knife tool in the gear precision roll flute processing of face.

Background technology

The display of state external gear investigative technique data, face gear can adopt the processing method of gear shaping, gear hobbing, mill teeth and roll flute.Because external opposite gear machining technology carries out strict maintaining secrecy, face gear machining technology and Tool Design technology is caused also to fail at home to grasp.Domesticly have recognized that the gear-driven advantage in face and wide application prospect, some basic theoretical researches are carried out, process technology research for face gear is mainly also in the Gear Shaping stage, have part to achieve the Gear Milling of face gear, but current processing method make the machining accuracy of face gear and working (machining) efficiency lower.And the research of face gear grinding process technology significantly improves the surface quality of tooth surface of face gear while can improving face Gear Processing precision, but domesticly the method for designing of related data opposite gear grinding cutter is not also had to be described.

Therefore, still lack a kind of face gear Special grinding cutting knife tool method for designing at present, to solve the design problem of grinding knife tool in the gear precision roll flute processing of face.The present invention is the method for designing that the development of face gear grinding cutter provides complete set.

Summary of the invention

The technical problem to be solved in the present invention is: the problem such as lower and surface quality is not high for the machining accuracy of the existing processing method of face gear, working (machining) efficiency, how design surface gear precision roll flute process tool is to improve the technical barrier of face Gear Processing precision and surface quality, provides a kind of face gear grinding devising method of cutting tool.The method according to face gear basic design parameters and spade wheel basic design parameters, can design gear precision roll flute processing dedicated tool of appearing, improves face Gear Processing precision and surface quality, simultaneously also for the processing of correction of the flank shape face gear lays the foundation.

The technical solution used in the present invention is: a kind of face gear grinding devising method of cutting tool, and its method flow is as follows:

Step (1), determine face gear and spade wheel basic design parameters, comprise modulus, pressure angle, the face gear number of teeth, spade tooth number.

Step (2), according to point cantact face gear drive principle, determine the theoretical number of teeth of face gear grinding cutter, many 1 ~ 3 of grinding knife tool theoretical gear ratio spade tooth number.

Step (3), according to face gear grinding process principle, set up face gear grinding Cutter coordinate system, comprise face gear movement coordinate system, spade wheel kinetic coordinate system, grinding knife tool kinetic coordinate system.

Step (4), according to face gear spade wheel tooth surface equation, and obtain the profile equation of face gear grinding cutter from the transformation matrix of coordinates that spade wheel coordinate is tied to grinding knife tool coordinate system.

Step (5), by profile parameter discretization in span of face gear grinding cutter, by choosing certain step size increments value, calculate corresponding face gear grinding cutter profile discrete point coordinate respectively.

Step (6), determine groove number and the helical angle of grinding knife tool according to groove theory, by 3 d modeling software, the face gear grinding cutter profile point coordinates calculated is passed through the genesis sequence of point, line, surface, body, set up face gear grinding cutter cutter hub model.

Step (7), set up face gear grinding cutter cutter hub model basis on, determine electroplating CBN abrasive machining mode, according to parameters such as face gear surface quality requirement determination wear particle size and blade widths; According to the accuracy class of face gear grinding cutter, determine the manufacturing tolerance such as the depth of parallelism of cutter both ends of the surface, profile of tooth tolerance, set up face gear grinding cutter drawing.

Described step (2) mid point contact surface gear drive principle refers to: if the theoretical number of teeth of the grinding knife tool of machined surface gear is identical with spade tooth number, then Gear Processing process in face is the meshed transmission gear process of simulation reality, and face gear drive can be made in theory to realize linear contact lay.But in actual engaged transmission process, the situation of this linear contact lay is impossible.Owing to installing and the impact of mismachining tolerance, tooth surface of face gear contact zone can offset, thus generation EDGE CONTACT, the meshing performance of influence surface gear and strength character.In order to avoid producing EDGE CONTACT, many 2 of the number of teeth that the theoretical number of teeth of face gear grinding cutter is taken turns than spade, to make tooth surface of face gear contact zone localize, becomes the gear drive of point cantact face.

In described step (3), face gear grinding Cutter coordinate system refers to: spade wheel rest frame and kinetic coordinate system, grinding knife tool rest frame and kinetic coordinate system.

In described step (4), face gear grinding cutter profile equation refers to the profile equation for the knife edge part of accurate grinding machined surface gear on cutter.

In described step (5) face gear grinding cutter profile discrete point coordinate refer to the profile equation of cutter blade part discrete after each discrete point coordinate value.

In described step (6), face gear grinding cutter cutter hub model refers to: cutter is after determining groove and helical angle, but basic configuration when not having electroplating CBN abrasive particle.

In described step (7), gear grinding cutter drawing in face refers to: under the condition determining face gear grinding cutter cutter hub moulded dimension, standard is manufactured and designed according to the machining accuracy of face gear, surface quality requirements and cutter, determine the design parameter of face gear grinding cutter, complete the design of cutter.

Principle of the present invention: according to face gear grinding process principle and the space curved surface theory of engagement, set up face gear, spade wheel with grinding knife tool three between meshing relation, be tied to the transformation matrix of coordinates of grinding knife tool coordinate system by spade wheel profile equation and spade wheel coordinate, obtain face gear grinding cutter profile equation.Utilize quantize fitting theory and groove of discrete point theoretical, set up face gear grinding cutter cutter hub threedimensional model, determine face gear grinding Tool Design engineering drawing according to the face accuracy of gear, surface quality requirements and Tool Design manufacturer's standard.

The present invention's beneficial effect is compared with prior art:

The domestic method for designing for face gear precision roll flute processing dedicated tool does not also have related description at present; External because technical know-how, also not relevant technical literature data is introduced.Therefore, the present invention well solves the technical barrier of face gear grinding Tool Design, designed face gear Special grinding cutting knife tool can not only improve face Gear Processing precision, working (machining) efficiency and surface quality, and adopt base steel electroplating CBN structure, improve cutting wear, this technology is also for the accurate roll flute processing of correction of the flank shape face gear is laid a good foundation.

Accompanying drawing explanation

Fig. 1 is method flow diagram of the present invention;

Fig. 2 is spade wheel, face gear, grinding knife tool engagement figure schematic diagram;

Fig. 3 is face gear grinding tool sharpening coordinate system schematic diagram;

Fig. 4 is spade wheel tooth surface parameters schematic diagram;

Fig. 5 is grinding knife tool profile discrete point coordinate schematic diagram;

Fig. 6 is grinding knife tool cutter hub model schematic;

Fig. 7 is face gear grinding Tool Design engineering drawing schematic diagram;

Fig. 8 is face gear grinding cutter pictorial diagram schematic diagram.

Detailed description of the invention

The present invention is further illustrated below in conjunction with drawings and the specific embodiments.

Detailed description of the invention one: composition graphs 1 to Fig. 7 illustrates embodiment of the present invention, the face gear grinding devising method of cutting tool of present embodiment is as follows:

Step one, choose face gear and spade wheel basic design parameters.Wherein gear basic design parameters in face refers to the face gear number of teeth, modulus, pressure angle; Spade wheel basic design parameters refers to spade tooth number, modulus, pressure angle.

Step 2, to determine the theoretical number of teeth of face gear grinding cutter according to point cantact face gear drive principle, the theoretical number of teeth of grinding knife tool equals spade tooth number and adds 1 ~ 3.

Step 3, according to face gear grinding process principle and the space curved surface theory of engagement, set up face gear grinding Cutter coordinate system.

Step 4, according to face gear spade wheel basic design parameters and spade wheel tooth surface equation, and derive from the transformation matrix of coordinates that spade wheel coordinate is tied to grinding knife tool coordinate system and to appear gear grinding cutter profile equation.

Step 5, by face gear grinding cutter profile parameter discretization in span, according to grinding knife tool profile equation, calculate face gear grinding cutter profile point coordinates corresponding when cutter profile parameter gets different value.

Step 6, by 3 d modeling software, grinding knife tool profile point coordinates is become line by spline curve fitting, then line is coupled together generation face cutter for gear wheel profile, face gear grinding cutter profile is sewed up by curved surface, fills, theoretical according to groove again, set up groove and helical angle, finally obtain grinding knife tool cutter hub threedimensional model.

Step 7, according to parameters such as face gear surface quality requirement determination electroplating CBN abrasive machining mode, wear particle size and blade widths; According to the accuracy class of face gear grinding cutter, determine the manufacturing tolerance such as the depth of parallelism of cutter both ends of the surface, profile of tooth tolerance, set up face gear grinding cutter drawing.

Detailed description of the invention two: in order to realize the gear drive of point cantact face in the step 2 of present embodiment, avoid because installation and Gear Contact district, foozle opposite have an impact, the serviceability of guarantee face gear, many 2 teeth of theoretical gear ratio spade tooth number of face gear grinding cutter.Other step is identical with detailed description of the invention one.

Detailed description of the invention three: composition graphs 2 and Fig. 3 illustrate present embodiment, in the step 3 of present embodiment, the foundation of face gear grinding Cutter coordinate system is based on face gear, spade wheel, is intermeshing between grinding knife tool three, and the shape of grinding knife tool end section is identical with the shape that spade takes turns shaft section.Can generate tooth surface of face gear due to spade wheel and face gear to rolling motion, in like manner, grinding knife tool and face gear rotate, and grinding knife tool cutter remakes radial and axial feed motion just can process identical tooth surface of face gear.Face gear grinding machining coordinate is: take turns with spade the coordinate system S connected firmly _s(x _s, y _s, z _s), the coordinate system S connected firmly with face gear grinding cutter _m(x _m, y _m, z _m), auxiliary coordinates S _a(x _a, y _a, z _a).Coordinate origin O _m, O _aoverlap; x _mand x _acoaxially, be the pivot center of cutter, z _sfor the pivot center of cutter; y _sand y _aon same straight line.Other step is identical with detailed description of the invention one.

Detailed description of the invention four: composition graphs 3 and Fig. 4 illustrate present embodiment, in the step 4 of present embodiment, spade wheel tooth surface equation is:

$r_s(u_s,{\mathrm{\θ}}_s)=\left[\begin{array}{c}{\±r}_{\mathrm{bs}}[\sin ({\mathrm{\θ}}_{\mathrm{os}}+{\mathrm{\θ}}_s)-{\mathrm{\θ}}_s\cos ({\mathrm{\θ}}_{\mathrm{os}}+{\mathrm{\θ}}_s)]\\ -r_{\mathrm{bs}}[\cos ({\mathrm{\θ}}_{\mathrm{os}}+{\mathrm{\θ}}_s)+{\mathrm{\θ}}_s\sin ({\mathrm{\θ}}_{\mathrm{os}}+{\mathrm{\θ}}_s)]\\ u_s\\ 1\end{array}\right]---\left(1\right)$

Wherein: r _bsfor spade wheel flank of tooth involute base radius, r _psfor spade wheel flank of tooth involute reference radius, u _sfor any axial parameter on the spade wheel flank of tooth, θ _osfor any angle parameter on spade wheel flank of tooth involute, θ _sfor spade wheel flank of tooth involute parameter; z ₁for spade tooth number, α ₁for spade wheel pressure angle.

The coordinate conversion matrix M of face gear grinding tool coordinate system is tied to from spade wheel coordinate _ms(Φ _m) be:

$M_{\mathrm{ms}}\left({\mathrm{\Φ}}_m\right)=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& \cos {\mathrm{\Φ}}_m& \sin {\mathrm{\Φ}}_m& -E_m\cos {\mathrm{\Φ}}_m\\ 0& -\sin {\mathrm{\Φ}}_m& \cos {\mathrm{\Φ}}_m& E_m\sin {\mathrm{\Φ}}_m\\ 0& 0& 0& 0\end{array}\right]---\left(2\right)$

Can obtain grinding knife tool profile equation by principle of coordinate transformation as follows, other step is identical with detailed description of the invention one.

$\begin{array}{c}{r}_m(u_s,{\mathrm{\θ}}_s,{\mathrm{\Φ}}_m)=M_{\mathrm{ms}}\left({\mathrm{\Φ}}_m\right)r_s(u_s,{\mathrm{\θ}}_{\mathrm{ks}})\\ =\left[\begin{array}{c}\±r_{\mathrm{bs}}[\sin ({\mathrm{\θ}}_{\mathrm{os}}+{\mathrm{\θ}}_{\mathrm{ks}})-{\mathrm{\θ}}_{\mathrm{ks}}\cos ({\mathrm{\θ}}_{\mathrm{os}}+{\mathrm{\θ}}_{\mathrm{ks}})]\\ -r_{\mathrm{bs}}\cos {\mathrm{\Φ}}_m[\cos ({\mathrm{\θ}}_{\mathrm{os}}+{\mathrm{\θ}}_{\mathrm{ks}})+{\mathrm{\θ}}_{\mathrm{ks}}\sin ({\mathrm{\θ}}_{\mathrm{os}}+{\mathrm{\θ}}_{\mathrm{ks}})]+u_s\sin {\mathrm{\Φ}}_m-E_m\cos {\mathrm{\Φ}}_m\\ r_{\mathrm{bs}}\sin {\mathrm{\Φ}}_m[\cos ({\mathrm{\θ}}_{\mathrm{os}}+{\mathrm{\θ}}_{\mathrm{ks}})+{\mathrm{\θ}}_{\mathrm{ks}}\sin ({\mathrm{\θ}}_{\mathrm{os}}+{\mathrm{\θ}}_{\mathrm{ks}})]+u_s\cos {\mathrm{\Φ}}_m+E_m\sin {\mathrm{\Φ}}_m\\ 1\end{array}\right]\end{array}---\left(3\right)$

Detailed description of the invention five: composition graphs 5 illustrates present embodiment, in the step 5 of present embodiment, the profile parameter of grinding knife tool refers to spade wheel flank of tooth involute parameter θ _s, its value excursion is wherein r _asfor spade wheel flank of tooth involute teeth tip circle radius.Other step is identical with detailed description of the invention one.

Detailed description of the invention six: composition graphs 6 illustrates present embodiment, adopts CATIA 3 d modeling software to set up face gear grinding cutter cutter hub threedimensional model in the step 6 of present embodiment.First face gear grinding cutter profile discrete points data file is imported in CATIA software and set up SPL, then SPL is coupled together generation face gear grinding cutter profile, 3D solid is set up finally by functions such as curved surface rotation, stitching, fillings, determine groove number and helical angle according to groove theory, finally determine face gear grinding cutter cutter hub model.Other step is identical with detailed description of the invention one.

Detailed description of the invention seven: composition graphs 7 illustrates present embodiment, face gear grinding cutter module m=4mm, pressure angle α in the step 7 of present embodiment ₁=20 °, theoretical tooth number Z=23 of grinding knife tool, cutter outer diameter D _a=139.25mm, groove number Z=20, blade widths B=11.1mm, helixangleβ=30 °.Tool precision hierarchical selection AA level.Other step is identical with detailed description of the invention one.

The present invention is further illustrated below in conjunction with example.

The present invention be directed to the specific side gear grinding cutter of face gear precision roll flute processing and design, if certain profile gear number of teeth is 42, modulus is 4mm, and pressure angle is 20 °; Spade tooth number is 21, and modulus is 4mm, and pressure angle is 20 °.

Below according to the inventive method flow process, progressively application example procedure of the present invention:

Step one, choose face gear tooth number Z ₂=42, modulus m ₂=4mm, pressure angle α ₂=20 °; Spade tooth number Z ₁=21, modulus m ₁=4mm, pressure angle α ₁=20 °, machining accuracy grade is 6 grades, roughness Ra≤0.8.

Step 2, according to point cantact face gear drive principle, determine that the theoretical number of teeth of face gear grinding cutter is Z=23.

Step 3, according to face gear grinding process principle and the space curved surface theory of engagement, the process setting up face gear grinding Cutter coordinate system is as follows: be intermeshing (as shown in Figure 2) between face gear, spade wheel, grinding knife tool three.Wherein, the shape of grinding knife tool end section is identical with the shape that spade takes turns shaft section.Can generate tooth surface of face gear due to spade wheel and face gear to rolling motion, in like manner, grinding knife tool and face gear rotate, and cutter remakes radial and axial feed motion just can process identical tooth surface of face gear.Set up the Cutter coordinate system of spade wheel and face gear grinding cutter as shown in Figure 3 for this reason.In figure: E _mthe distance at-face gear grinding cutter and spade wheel center; Φ _mthe corner of-face gear grinding cutter.

Face gear grinding processing can adopt following 3 coordinate systems: take turns with spade the coordinate system S connected firmly _s(x _s, y _s, z _s), the coordinate system S connected firmly with face gear grinding cutter _m(x _m, y _m, z _m), auxiliary coordinates S _a(x _a, y _a, z _a).Coordinate origin O _m, O _aoverlap; x _mand x _acoaxially, z _sfor the pivot center of cutter; y _sand y _aon same straight line.

Step 4, face gear spade wheel tooth surface equation is:

$r_s(u_s,{\mathrm{\θ}}_s)=\left[\begin{array}{c}{\±r}_{\mathrm{bs}}[\sin ({\mathrm{\θ}}_{\mathrm{os}}+{\mathrm{\θ}}_s)-{\mathrm{\θ}}_s\cos ({\mathrm{\θ}}_{\mathrm{os}}+{\mathrm{\θ}}_s)]\\ -r_{\mathrm{bs}}[\cos ({\mathrm{\θ}}_{\mathrm{os}}+{\mathrm{\θ}}_s)+{\mathrm{\θ}}_s\sin ({\mathrm{\θ}}_{\mathrm{os}}+{\mathrm{\θ}}_s)]\\ u_s\\ 1\end{array}\right]---\left(4\right)$

Wherein: r _bsfor spade wheel flank of tooth involute base radius, r _psfor spade wheel flank of tooth involute reference radius, u _sfor any axial parameter on the spade wheel flank of tooth, θ _osfor any angle parameter on spade wheel flank of tooth involute, θ _sfor spade wheel flank of tooth involute parameter; z ₁for spade tooth number, α ₁for spade wheel pressure angle.

The coordinate conversion matrix M being tied to gear grinding tool coordinate system in face from spade wheel coordinate is obtained according to Fig. 3 _ms(Φ _m) as follows:

$M_{\mathrm{ms}}\left({\mathrm{\Φ}}_m\right)=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& \cos {\mathrm{\Φ}}_m& \sin {\mathrm{\Φ}}_m& -E_m\cos {\mathrm{\Φ}}_m\\ 0& -\sin {\mathrm{\Φ}}_m& \cos {\mathrm{\Φ}}_m& E_m\sin {\mathrm{\Φ}}_m\\ 0& 0& 0& 0\end{array}\right]---\left(6\right)$

Known spade wheel involute flank equation and the face gear grinding Cutter coordinate system set up, can obtain grinding knife tool profile equation by principle of coordinate transformation:

$\begin{array}{c}{r}_m(u_s,{\mathrm{\θ}}_s,{\mathrm{\Φ}}_m)=M_{\mathrm{ms}}\left({\mathrm{\Φ}}_m\right)r_s(u_s,{\mathrm{\θ}}_{\mathrm{ks}})\\ =\left[\begin{array}{c}\±r_{\mathrm{bs}}[\sin ({\mathrm{\θ}}_{\mathrm{os}}+{\mathrm{\θ}}_{\mathrm{ks}})-{\mathrm{\θ}}_{\mathrm{ks}}\cos ({\mathrm{\θ}}_{\mathrm{os}}+{\mathrm{\θ}}_{\mathrm{ks}})]\\ -r_{\mathrm{bs}}\cos {\mathrm{\Φ}}_m[\cos ({\mathrm{\θ}}_{\mathrm{os}}+{\mathrm{\θ}}_{\mathrm{ks}})+{\mathrm{\θ}}_{\mathrm{ks}}\sin ({\mathrm{\θ}}_{\mathrm{os}}+{\mathrm{\θ}}_{\mathrm{ks}})]+u_s\sin {\mathrm{\Φ}}_m-E_m\cos {\mathrm{\Φ}}_m\\ r_{\mathrm{bs}}\sin {\mathrm{\Φ}}_m[\cos ({\mathrm{\θ}}_{\mathrm{os}}+{\mathrm{\θ}}_{\mathrm{ks}})+{\mathrm{\θ}}_{\mathrm{ks}}\sin ({\mathrm{\θ}}_{\mathrm{os}}+{\mathrm{\θ}}_{\mathrm{ks}})]+u_s\cos {\mathrm{\Φ}}_m+E_m\sin {\mathrm{\Φ}}_m\\ 1\end{array}\right]\end{array}---\left(7\right)$

Step 5, according to step 4, get spade wheel flank of tooth involute parameter θ _sspan be [0, θ _max], θ _maxsize be:

Wherein: r _asfor spade wheel flank of tooth involute teeth tip circle radius.

Through calculating face gear grinding cutter profile discrete point coordinate as shown in Figure 5.

It is as follows that step 6, this example set up face gear grinding cutter cutter hub model process by three-dimensional software CATIA:

1) according to the data file of face gear grinding cutter profile discrete point, open CATIA software, Modling model document, enter the importing data pattern of CATIA software, import profile point, then in part pattern, set up curve according to profile point.

2) after setting up SPL, by line being coupled together generation face gear grinding cutter profile.

3) after obtaining grinding knife tool profile, carry out d solid modeling, obtain 3D solid by functions such as curved surface rotation, stitching, fillings, determine groove number and helical angle according to groove theory, finally obtain face gear grinding cutter cutter hub model as shown in Figure 6.

Step 7, machining accuracy, surface quality requirements and cutter according to face gear manufacture and design standard, other parameter determination process of face gear grinding cutter are as follows:

1) the overall structure size of face gear grinding cutter

Grinding knife tool modulus m=4mm, pressure angle α ₁=20 °, theoretical tooth number Z=23 of grinding knife tool, cutter external diameter groove number Z=20, blade widths B=11.1mm, helixangleβ=30 °.Tool precision hierarchical selection AA level.

2) face gear grinding tool-tooth profile size

Height of teeth root wherein: for height of teeth root coefficient, get 1; C' is tip clearance coefficient, gets 0.25.

Height of teeth top $h_a=h_a^{*}\·m=1\×4=4\mathrm{mm}.$

Fully teeth height h ₀=h _a+ h _f=9mm.

3) other sizes of grinding knife tool

A. abrasive particle is selected

Abrasive particle selects electroplating CBN abrasive particle, and according to the face accuracy of gear and roughness requirements, granularity gets 200#.

B. groove Selecting parameter

Theoretical according to groove, groove factor η=0.7, groove number Z=20, helixangleβ=30 °.

C. capacity chip slot depth

Grinding knife tool capacity chip slot depth H=h ₀+ K+ (0.5 ~ 1)=9+2+0.5=11.5.

To sum up, gear grinding cutter drawing of appearing can be designed, as shown in Figure 7.

In Fig. 7, technical requirement is:

1, the radial run-out of the internal empty axis of circumference sword: adjacent teeth 0.07mm, cutter one turn of 0.10mm;

2, the oblique circle of side edge is beated 0.10mm;

3, the depth of parallelism 0.01mm of both ends of the surface;

4, cutter two ends are to the range difference 0.25mm of same diametrically any profile of tooth point;

5, profile of tooth tolerance: involute part 0.10mm, tooth top and fillet part 0.16mm;

6, cutter plating abrasive particle thickness is no more than 0.06mm;

7, cutter cutter hub cutting tip hardness is HRC65-67;

8, tool surface must not have the defect of the other influences serviceabilities such as crackle.

Wherein face gear grinding cutter basic design parameters is as table 1.

A table 1 gear grinding cutter basic design parameters

Grinding knife tool pictorial diagram as shown in Figure 8.

The present invention is based on face gear grinding process principle and the space curved surface theory of engagement, establish the face gear grinding devising method of cutting tool of complete set.The grinding knife tool of application the present invention design, can improve face Gear Processing precision, working (machining) efficiency and surface quality, and grinding knife tool adopts the mode of electroplating CBN abrasive particle, improves tool life.The present invention is applicable to the design of grinding knife tool in the gear precision roll flute processing of face, for face Gear Processing provides a kind of dedicated tool method for designing.

Non-elaborated part of the present invention belongs to techniques well known.The technical scheme that all employing equivalents or equivalence are replaced and formed, all drops within rights protection scope of the present invention.

Claims (8)

1. a face gear grinding devising method of cutting tool, is characterized in that step is as follows:

Step (1), determine face gear and basic design parameters that the spade that is meshed with face gear is taken turns;

Step (2), according to point cantact face gear drive principle, determine the theoretical number of teeth of face gear grinding cutter;

Step (3), analysis face gear grinding process principle, set up face gear grinding Cutter coordinate system;

Step (4), according to face gear spade wheel basic design parameters and spade wheel tooth surface equation, set up face gear grinding cutter profile equation;

Step (5), according to face gear grinding cutter profile equation, by face gear grinding cutter profile equation discretization, determine the profile point coordinates of face gear grinding cutter;

Step (6), theoretical according to the groove of abrasive grinding wheel, by grinding knife tool profile discrete point coordinate is carried out matching, set up the cutter hub model of face gear grinding cutter;

Step (7), according to face gear basic design parameters and Gear shape process precision and electroplating CBN abrasive machining principle, determine structural parameters and the manufacturing tolerance of face gear grinding cutter, devise grinding knife tool engineering drawing.

2. a kind of face gear grinding devising method of cutting tool according to claim 1, it is characterized in that: in described step (1), face gear basic design parameters refers to the face gear number of teeth, modulus, pressure angle, spade wheel basic design parameters refers to spade tooth number, modulus, pressure angle.

3. a kind of face gear grinding devising method of cutting tool according to claim 1, it is characterized in that: described step (2) mid point contact surface gear drive principle refers to: face gear and spade wheel are linear contact lay in theory, installation and foozle make Gear Contact district, face offset, produce EDGE CONTACT, thus the serviceability of influence surface gear, in order to avoid this situation, the theoretical number of teeth of face gear grinding cutter needs 1 ~ 3 tooth more than spade tooth number, to make circular tooth contact localize, form the gear drive of point cantact face.

4. a kind of face gear grinding devising method of cutting tool according to claim 1, it is characterized in that: in described step (3), face gear grinding process principle refers to: face gear, intermeshing between spade wheel and grinding knife tool three, internal messing between spade wheel and grinding knife tool, namely the contrate tooth profile of face gear grinding cutter is identical with the contrate tooth profile that spade is taken turns, because spade wheel and the generating motion of face gear can forming surface gear teeth faces, therefore, grinding knife tool and face gear are rotated according to gearratio relation, grinding knife tool makes axial feed motion simultaneously, radial feed moves and adds translation and just can process identical tooth surface of face gear by generate, face gear grinding Cutter coordinate system refers to the face gear grinding Cutter coordinate system set up based on face gear grinding process principle.

5. a kind of face gear grinding devising method of cutting tool according to claim 1, it is characterized in that: in described step (4), face gear spade wheel basic design parameters refers to modulus, the number of teeth, the pressure angle of designed involute profile, spade wheel profile equation refers to involute spur gearing tooth surface equation, and face gear grinding cutter profile equation is the function of these parameters above.

6. a kind of face gear grinding devising method of cutting tool according to claim 1, it is characterized in that: in described step (5), face gear grinding cutter profile equation discretization refers to: grinding knife tool profile parameter is discrete in span, the discrete point coordinate of corresponding face of asking for gear grinding cutter profile.

7. a kind of face gear grinding devising method of cutting tool according to claim 1, it is characterized in that: in described step (6), gear grinding cutter model in face refers to groove number and the helical angle of determining cutter according to groove theory, and grinding knife tool profile discrete point is formed SPL by curve, then grinding face is generated, last simultaneous groove number and helical angle, generate grinding knife tool cutter hub model further.

8. a kind of face gear grinding devising method of cutting tool according to claim 1, it is characterized in that: in described step (7), tool structure parameter refers to: blade widths, groove number, helical angle, CBN wear particle size etc., cutter manufacture tolerance refers to: the depth of parallelism, profile of tooth tolerance etc. of cutter both ends of the surface.