JPH06218629A - Working method for gear shape - Google Patents

Abstract

PURPOSE:To improve working precision by allowing a tuff shaped electrode having a gear tooth shape to approach to a workpiece in revolution, synchronously moving both in a meshing supposed state, and carrying out electric discharge machining, under the application of the cut-in quantity control between both the axes of the workpiece and the electrode. CONSTITUTION:A tuff shaped electrode 4a having a gear tooth shape is allowed to approach to a workpiece 14 revolved by a servomotor 28 which is held on a chuck 16, and the workpiece 14 and the tuff shaped electrode 4a are synchronously driven, in meshing supposition. The worked part with the electrode 4a of the workpiece 14 is formed always to a linear shape, and sludge is discharged, and the part between the axes of the workpiece 14 and the electrode 4a is applied with the prescribed cut-in quantity control, and electric discharge is carried out. Accordingly, the electrode 4a is turned in the L1 direction, carrying out the electric discharge for the inner peripheral part of the workpiece 14, and the workpiece 14 is turned in the L2 direction in synchronization, and the position of the chuck and the detection signal of a speed detection part 26 are feedback-inputted into the servomotor 28 for revolving the workpiece, and synchronously drive is carried out, and electric discharge machining is carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear-shaped machining method, and more particularly to a gear-shaped machining method for machining a workpiece into a gear-shaped finished product by electric discharge machining using a forming electrode.

[0002]

BACKGROUND OF THE INVENTION Gears are an important component of machines that transmit motion by successive meshing teeth. In particular, since it is possible to efficiently transmit a rotational motion with an accurate speed ratio and a large amount of power with an extremely small structure, small gears such as meters and clocks to transmission gears for medium-sized automobiles and large gears can be used. It is used in an extremely wide range of fields, from tens of thousands of horsepower to marine turbine reduction gears.

Generally, since the magnitude of vibration and noise of a gear depends on whether the machining accuracy is good or bad, it is desired to improve the machining accuracy. Particularly in the field of automobiles where habitability is important recently, it is required to improve the machining accuracy of gears in order to eliminate the causes of vibration and noise.

Conventionally, gears have been formed by a machining method using a gear cutting machine, a forging method, an electric discharge machining method, etc. In consideration of productivity, a forging method that can be mass-produced relatively easily at low cost ( Extrusion forging method and sintering forging method) are adopted. In the case of forging, the accuracy of the forging die directly affects the accuracy of the gear, so it is important to obtain a highly accurate die. For the processing of this die, it is possible to perform processing regardless of the mechanical strength of the substance that is the material of the die, and electric discharge machining that can perform highly accurate machining is used. Then, various methods have been tried to improve the processing accuracy. For example, in Japanese Utility Model Publication No. 61-5528,
Disclosed is an electrode for electric discharge machining in which a rough machining electrode and a finishing machining electrode are provided on one common electrode shaft to improve the precision of completion machining of a gear shape. In addition, JP-A-4
No. 152025 discloses a discharge of a forging die capable of coping with various specification changes of a gear by changing the thickness of an electrode portion formed on the tooth tip of the electric discharge machining electrode to a spur gear shape. Processing methods are disclosed.

In the conventional gear-shaped electric discharge machining, an electric discharge machining electrode having the same shape as a gear-shaped tooth profile formed on a material (work) is formed in the axial direction of the work, that is, a gear-shaped shaft formed. Electric discharge machining is performed while moving in the direction to form a gear shape. At this time, a female gear shape is formed when the electric discharge machining electrode has a male gear shape, and a male gear shape is formed when the electric discharge machining electrode has a female gear shape.

[0006]

However, in the conventional gear-shaped electric discharge machining method, the total shape of the electric discharge machining electrode and the work piece are 0.02 to 0.08 through the machining liquid (insulating liquid such as kerosene or pure water).
The electrodes move in the direction of the gear axis while advancing while machining with a distance of 0.05 mm, which makes it difficult to discharge and eliminate sludge, and sludge is for machining surfaces and electrical discharge machining. There is a problem that the processing accuracy is lowered due to adhesion to the electrode or deterioration of the insulating property of the processing liquid. Further, immediately after the start of electric discharge machining and immediately before the end of electric discharge machining, that is, when only a part of the electric discharge machining electrode is close to the work, the electric discharge is concentrated in a part of the vicinity of the work and the electric discharge machining electrode, The discharge conditions are different immediately after the start of electric discharge machining and immediately before the end of electric discharge machining, and during steady machining, that is, when the entire electric discharge machining electrode and the workpiece are uniformly approaching each other. As a result, near the entrance / exit of the EDM electrode, the area of the EDM electrode close to the work is small, so the discharge is concentrated and the work is melted a lot, and the machining surface fluctuates due to excessive melting of the machining surface. As a result, there is a problem that the accuracy of the gear shape is reduced.

Further, generally, as a post-process, machining such as grinding and lapping is required, but the work is fixed (chucking) again in each process, and a setup error is caused in addition to a mechanical machining error. However, there is a problem in that the accuracy of the gear shape is further reduced.

In view of the above, the present invention improves the machining accuracy of the gear shape by performing electric discharge machining and discharging and removing sludge easily while synchronously moving the workpiece and the forming electrode in the gear shape machining method. It is an object of the present invention to provide a gear-shaped processing method capable of achieving the above.

Another object is to perform consistent machining from the material to the completion of the gear shape in the gear shape machining method while the workpiece and various tools are engaged and synchronized with each other while the workpiece is chucked. It is therefore an object of the present invention to provide a gear shape machining method capable of easily discharging and eliminating sludge and eliminating setup errors to improve the machining accuracy of gear gears.

[0010]

In order to solve the above-mentioned problems, the present invention is as follows. First, a gear-shaped forming electrode is brought close to a work rotatably supported, and the work and the electrode are Assuming that the workpieces are synchronized with each other and the cutting amount is controlled between the shafts of the workpiece and the electrode, the workpiece is subjected to electric discharge machining by the electrode to obtain a desired gear shape. In the first gear shape machining method, while the electric discharge machined work is fixed to the work shaft,
The workpiece is ground by the grinding wheel while the gear-shaped full-form grinding wheel is brought into contact with the work piece, and the work piece and the grinding wheel are engaged in synchronous movement, and the grinding amount is controlled between both axes of the work piece and the grinding wheel. As a third feature, in the second gear shape machining method, a relative reciprocating motion is performed between the workpiece and the grinding wheel in the tooth trace direction of the gear shape. It is characterized by giving and grinding to obtain a desired gear shape. Fourthly,
In the first or second gear-shaped machining method, a workpiece, which has been electric discharge machined or ground, is fixed to a workpiece shaft, and a gear-shaped full-form lapping wheel is brought into contact with the workpiece to separate the workpiece and the lapping wheel. While making the meshing synchronous movement and giving the control of the cutting amount between both axes of the work and the lapping stone,
A fifth aspect of the present invention is characterized in that a desired gear shape is obtained by lapping a work with a lap grindstone. Fifthly, in the fourth gear shape machining method, gear-shaped teeth are provided between the work and the lap grindstone. The present invention is characterized in that a desired gear shape is obtained by applying relative reciprocating motion in a muscle direction to obtain a desired gear shape. As a sixth feature, in the machining method of the gear shape of the fourth or fifth aspect, the work and the lap grindstone are used. And a high-frequency vibration is applied in the tooth trace direction of the gear shape to obtain a desired gear shape by lapping, and the seventh is the first, second, third, or fourth. Or fifth
Alternatively, in the sixth gear shape machining method, the workpiece and the master gear are meshed with the workpiece master gear for measuring tooth profile of a gear shape while the workpiece machined by electrical discharge machining, grinding or lapping is fixed to the workpiece shaft. It is characterized by measuring the shape error between and.

[0011]

In the gear shape machining method of the present invention, the gear-shaped forming electrode is brought close to the work piece rotatably supported, and the work piece and the electrode are assumed to move in a synchronized manner.
While controlling the depth of cut between the work and electrode axes,
Electric discharge machining is performed on the work with electrodes. Therefore, the relative positional relationship between the work and the gear-shaped forming electrode is constantly changing, and the approaching portions of the two are always linear, so that sludge can be easily discharged and removed. Further, the amount of approach between the work and the gear-shaped forming electrode can be made constant at all times. Therefore, the processing conditions are always constant regardless of external factors. In addition, even in the case of grinding and lapping, the contact portion between each tool and the work is linear, and it is possible to easily discharge and remove sludge, which enables stable processing.

Furthermore, since the grindstone is relatively reciprocated in the tooth trace direction during grinding or lapping, the gear shape is made uniform and the tooth contact of the gear shape can be adjusted.

Further, it is possible to carry out grinding, lapping and accuracy measurement following the electric discharge machining while chucking the work, and it is possible to eliminate setup errors.

[0014]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic view of a processing apparatus for carrying out the gear-shaped processing method according to the present invention. The machining apparatus 1 sequentially replaces a plurality of machining tools, for example, an electrode for electric discharge machining, a grinding wheel for grinding, a lapping wheel for lapping, etc., while the workpiece is chucked, to change the shape of the gear from the material. A series of machining (electric discharge machining, grinding, lapping, etc.) and accuracy measurement are performed until the completion of. That is, the tool 4 supplied by the automatic tool changer 2 having the robot arm 2a (the electrode 4a in the case of electric discharge machining, the grinding stone in the case of grinding, the lapping stone in the case of lapping, the measurement jig in the case of accuracy measurement). (Equipment etc.)
It is held by a holder 8 that interlocks with an indexing and rotating device 6 having an indexing and positioning device. Further, the holder 8 and the indexing / rotating device 6 are built in the rotary head portion 12 which moves up and down along the column 10. The workpiece 14, which is a workpiece, has a plurality of nails 1.
It is fixed by a chuck 16 which has a rotating mechanism (not shown) such as a servo motor and which has 6a. This chuck 16 is a base 1 having a built-in chuck rotating mechanism.
8 is rotatably mounted, and the base 18 is held by a saddle table 20 having a drive mechanism that can move in the X-axis and Y-axis directions. Further, on the upper surface of the saddle table 20, the work 14, the chuck 16, the base 1
8 is provided with a processing tank 22 for ensuring the safety of the processing operator during processing and temporarily storing the processing liquid sprayed / supplied to the work 14. A working liquid according to the working is supplied to the working tank 22 from a working liquid supply device 24. In addition, this machining fluid supply device 24 stores the machining fluid
It also has the function of performing precipitation and filtration. In addition to this, the processing apparatus 1 is provided with a centralized control device, a control device, and the like.

As a first embodiment of the machining apparatus 1 having the above structure, an internal gear-shaped electric discharge machining method is shown in FIG.
This will be described with reference to FIG.

The first feature of the present invention is that a gear-shaped forming electrode 4a as a tool 4 is brought close to a work 14 rotatably supported, and the work and the electrode 4a are assumed to be in mesh with each other. This is to obtain a desired gear shape by electrical discharge machining while moving and controlling the depth of cut between both axes of the work 14 and the electrode 4a.

The work 14 and the electrode 4a perform a synchronous movement as if the planet pinion gear of the planetary gear mechanism and the internal gear move while meshing with each other. That is, the electrode 4a attached to the holder 8 at the machine center of the processing apparatus 1 and having a predetermined gear shape is provided on the inner peripheral portion of the work 14 held by the plurality of claws 16a of the chuck 16 as shown in FIG. While performing electric discharge machining, it rotates in the direction of arrow L _{1 in the} figure. At this time, the work 14 is rotatably attached to the base 18, and is synchronized with the rotation of the electrode 4a as shown in FIG.
Rotate in the direction of the middle arrow L ₂ . At this time, the chuck 16 has a chuck rotation position / speed detection unit 26,
The rotation speed and position of the workpiece are rotationally driven by a work rotation servomotor 28 capable of feedback control. At the time of electric discharge machining, as in the case of normal electric discharge machining, the machining tank 22 (see FIG. 1) is filled with a machining liquid (kerosene or pure water), the work 14 and the electrode 4a are put into the machining liquid, and then the electric discharge machining is performed. The conditions are determined, and the workpiece 14 and the electrode 4a are caused to move in synchronization with each other assuming engagement. At this time, the saddle table 20 equipped with the base 18
(See FIG. 1) is, for example, continuously and continuously fed in the direction of arrow X in FIG. Therefore, work 1
4 and the electrode 4a are supposed to mesh with each other gradually becoming deeper and the electrode 4
The portion through which a has passed is removed, and a gear shape can be formed on the inner peripheral portion of the work 14.

FIG. 4 is a schematic view showing an example of the structure for realizing the meshing assumed synchronous motion of the gear shape machining method of the present invention. The electrode 4a is attached to the holder 8 and has a tool rotation position / speed detection unit 30 and a tool rotation servomotor 32.
It is held by the rotary head unit 12 including.

On the other hand, the work 14 is rotatably mounted on a base 18 and has a chuck 16 having a plurality of claws 16a.
And a chuck rotation position / speed detection unit 26, and a workpiece rotation servomotor 28 capable of feedback controlling the rotation speed and the position of the chuck 16 is rotationally driven in synchronization with the rotation of the electrode 4a.

Further, the base 1 on which the chuck 16 is mounted
8 is driven in the left-right direction by an X-direction feed mechanism. X
When the direction feed mechanism is composed of, for example, a ball screw 44, the base 18 fixed to the female screw portion 42 is engaged with the bed 50 and is moved by the base driving servomotor 48 having the base rotation position / speed detecting portion 46 to move the base 18 to the X direction. Driving with high accuracy in the direction (left-right direction in the figure). Further, the saddle table 20 on which the base 18 is mounted is driven in the front-rear direction by the Y-direction feed mechanism. When the Y-direction feed mechanism is composed of, for example, a ball screw, the saddle table 20 fixed to the female screw portion 52 has the saddle table rotation position / speed detection unit 5
The saddle table driving servomotor 56 having the number 4 drives the saddle table 20 in the Y direction (front-back direction in the drawing) with high accuracy. By combining the driving in the X direction and the driving in the Y direction, the eccentric direction and the eccentric amount of the rotational movement of the work 14 can be freely changed.

Further, each of the servo motors 28, 32, 4
8, 56 and the like are controlled by the NC controller 58 so that the associated servo motors perform predetermined operations. Especially at the time of electrical discharge machining, the NC controller 58 is used to
The rotation speed of the tool rotation servo motor 32 that drives a is precisely maintained, and the work rotation servo motor 28 that operates so as to follow the electrode constantly detects and feeds back the rotation position and rotation speed of the work 14. The rotation speed is controlled by the position / speed control unit 60 which controls while performing comparative calculation, and the machining is performed by the electric discharge machining condition control unit 62 which controls the electric discharge machining condition while interlocking with the signals of the NC controller 58 and the position / speed control unit 60. Can be advanced. In this way, the workpiece 14 and the electrode 4a rotate in relation to each other while performing the assumed synchronous movement, so that the relative positional relationship between the workpiece 14 and the electrode 4a constantly changes, and the approaching portion between the workpiece 14 and the electrode 4a is always linear.
The sludge can be easily discharged and removed, and the working fluid can be circulated smoothly. Further, the amount of approach between the workpiece and the gear-shaped forming electrode can be made constant at all times, and fluctuations in the machining conditions of electric discharge machining due to external factors can be eliminated. Therefore, it is possible to perform highly accurate electric discharge machining of the gear shape.

By the same machining method, it is possible to easily perform electric discharge machining, for example, even in the case of a stepped gear having internal teeth and the bottom surface side has a larger inner diameter.

Further, in the embodiment, the rotary head portion 12 is driven in the vertical direction by the Z-direction feed mechanism in order to give the relative motion in the tooth trace direction between the work 14 and the electrode 4a. When the Z-direction feed mechanism is composed of, for example, a ball screw 36, the rotary head portion 12 fixed to the female screw portion 34 is engaged with the column 10 and has a head portion rotational position / speed detection portion 38. The rotary head unit 12 is smoothly driven in the Z direction (vertical direction in the figure) by.

FIGS. 5 and 6 show an external gear-shaped electric discharge machining method as a second embodiment. This external gear shape machining method can be realized by the same machining apparatus and the same control method as the internal gear shape electric discharge machining method of the first embodiment. The difference from the first embodiment is that, as shown in FIGS. 5 and 6, the electrode 4a-1 for electric discharge machining has the outer peripheral portion of the work 14-1 in the opposite direction to the work 14-1 (the electrode 4a-1 is 6 in the L direction, and the workpiece 14-1 is performing the assumed meshing synchronous motion while rotating in the R direction in FIG. In this case, the chuck 16 sequentially and continuously feeds a predetermined amount as an electric discharge machining allowance in the direction of the arrow X'in FIG. 6, so that the expected meshing position between the work 14-1 and the electrode 4a-1 becomes gradually deeper. The portion where -1 has passed is removed, and a gear shape can be formed on the outer peripheral portion of the work 14-1.

7 and 8 show a bevel gear-shaped electric discharge machining method as a third embodiment. This bevel gear-shaped machining method can also be realized by a machining apparatus having substantially the same configuration as the external gear-shaped electric discharge machining method of the second embodiment and by a similar control method. When performing bevel gear shape electrical discharge machining,
The difference from the first and second embodiments is that, as shown in FIGS. 7 and 8, the work 14-2 is tilted by an angle θ with respect to the electrode 4a-2 in accordance with the axial angle θ of the bevel gear shape. It is the point that is arranged. In other words, chuck 16, base 18, saddle
The rotation driving means for the work 14 such as the table 20 is the electrode 4a.
Is inclined by an angle θ with respect to the rotation axis. In this case, the chuck 16 is moved continuously in the direction of arrow Z in FIG. 7 by a predetermined amount as an electric discharge machining allowance, whereby the position where the workpiece 14-2 and the electrode 4a-2 are meshed is gradually deepened, and the electrode 4a is gradually deepened. -The passed part of -2 is removed and the work 14
A bevel gear shape can be formed on the outer peripheral portion of -2. In this case, the electrode 4a-2 is moved by the tool rotation servomotor 32 (see FIG. 4) having a Z-direction feed mechanism to the arrow Z'in the figure.
Similar processing can be performed by sequentially and continuously moving in the direction by a predetermined amount.

As described above, the positional relationship between the electrode and the work is established by intersecting the respective rotary axes of the electrode and the work at an arbitrary angle θ, offsetting the respective rotary axes, or both. By changing according to the desired gear shape, and by performing an assumed synchronized movement of the electrode and the work formed in the shape of the desired gear specifications, the spur gear, the helical gear, the helical gear, etc. Bevel gears such as bevel gears, Zellore bevel gears and hypoid gears can be processed.

A second feature of the present invention is that a tool is supplied by an automatic tool changer having a robot arm in a state where the work is fixed to the work shaft, that is, a work is chucked. It is possible to perform grinding, lapping, and accuracy measurement following electrical discharge machining by (grinding stone for grinding, lapping stone for lapping, measuring jig for accuracy measurement, etc.). .

Also in this case, as in the electric discharge machining, the workpiece is brought into contact with a gear-shaped full-form grinding wheel or a lapping wheel,
A desired gear shape is obtained by grinding or lapping while controlling the amount of shaving between the work and the grindstone while causing the work and the grindstone to move in synchronism with each other. Therefore, since the grindstone revolves around the workpiece while rotating, and the grindstone grinds and laps the actual meshing portion of the workpiece, it is possible to obtain a gear shape in the same contact state as when meshing. Further, although grinding and lapping can be sufficiently performed by the meshing synchronous movement, the cutting grindstone, the lapping grindstone, and the like are in a direction parallel to the rotation axis of the grindstone, that is, the rotary head portion holding the grindstone is the Z-direction feed mechanism. It is possible to perform more effective and highly accurate grinding and lapping by driving the grinding wheel up and down to relatively reciprocate along the gear-shaped tooth trace to be processed. Further, by giving the relative reciprocating motion by high frequency vibration, more effective processing can be performed.

On the other hand, when grinding or lapping a gear shape having a complicated shape such as a bevel gear,
It is necessary to avoid interference between the work other than the processing part and the grindstone, but by providing every other tooth of the grindstone 64 as shown in FIG. 9, machining without interference between the work 14 and the grindstone 64 is possible. Become. Further, as shown in FIG. 10, a desired gear shape can be processed with higher accuracy by changing the shape of the grindstone and partially processing the gear shape. That is, the tooth thickness of the grindstone 64a shown in FIG.
The grindstones 64b and 64c shown in FIGS. 0 (b) and (c) have a low tooth height to process the tip portion of the work 14. In addition, it is possible to form a highly accurate gear shape with good tooth contact by matching the shapes of the grindstones as needed, such as the shape for processing only the tooth surface.

11 and 12, a series of electric discharge machining, grinding and lapping are completed in a state where the work is chucked in the machining apparatus 1 shown in FIG. 1 and processed into a desired gear shape. The outline of the meshing measurement jig for measuring the shape error between the workpiece and the master gear is shown.

The engagement measuring jig 90 has gear characteristics of a desired gear shape, and is rotated by the rotational force of the work while meshing with the processed work of the gear shape.
have. The master gear 66 is rotatably attached to a slide holder 72 by a retainer 70 via a bearing 68. Further, the slide holder 72 has a U groove 74 formed in the center of the upper surface. The main shaft 76 held by the holder 8 of the processing apparatus 1 is engaged with the slide holder 72 via the U groove 74. That is, the slide holder 72 has the slide neck 78 of the main shaft 76.
Is engaged with the rotation axis of the master gear 66 so as to be slidable in the vertical direction. Further, a thrust receiver 80 is fixed to the slide holder 72, and the slide holder 72 is
A pair of springs 82 are arranged with the main shaft 76 interposed therebetween in the sliding direction of the slide holder 72.
Is always biased toward the center. Further, a minute displacement amount detection sensor 86 is provided on a sensor mounting base 84 mounted on a part of the slide holder 72 so as to have a surface parallel to the rotation axis of the master gear 66.

The meshing measurement jig 9 having the above structure
The zero master gear 66 rotates by the rotational force of the work while meshing with the processed gear-shaped work. At this time, if there is a shape error between the master gear 66 and the work, the work displaces the master gear 66 in the direction of arrow A in FIG. 12 together with the slide holder 72 against the biasing force of the spring 82. This displacement amount is detected by the minute displacement amount detection sensor 86.
The machining accuracy such as the meshing accuracy of the gear shape of the workpiece that is detected and processed by the measurement is measured.

[0034]

According to the method of machining a gear shape according to the present invention, a gear-shaped forming electrode is brought close to a work piece rotatably supported, and the work piece and the electrode are moved synchronously with each other. By controlling the depth of cut between the work and the electrode and performing the electric discharge machining of the work with the electrode, the relative positional relationship between the work and the gear-shaped forming electrode is constantly changing, and the approaching parts of both Is always linear. As a result,
It becomes possible to easily discharge and remove sludge.
Further, the amount of approach between the work and the gear-shaped forming electrode can be made constant at all times. Therefore, the machining conditions are always constant without being influenced by external factors, highly accurate electric discharge machining can be performed, and a highly accurate gear shape can be obtained.

Also, in the case of grinding and lapping, the contact portion between each tool and the work is linear, so that sludge can be easily discharged and removed, and stable machining can be performed.

Furthermore, since the grindstone is relatively reciprocated in the tooth trace direction during grinding or lapping, the gear shape is made uniform and the tooth contact of the gear shape can be adjusted.

Further, it is possible to carry out grinding, lapping and accuracy measurement following electrical discharge machining while chucking the work, and it is possible to eliminate setup errors. Therefore, the processing conditions are always constant without being influenced by external factors, and a gear shape with high processing accuracy can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic view of a processing apparatus that carries out a gear-shaped processing method according to the present invention.

FIG. 2 is a side sectional view for explaining the positional relationship between the work and the electrode in the first embodiment of the gear shape machining method according to the present invention.

FIG. 3 is an explanatory view for explaining the positional relationship between the work and the electrode in the first embodiment of the gear-shaped machining method according to the present invention.

FIG. 4 is an explanatory diagram for explaining a configuration for realizing a meshing assumed synchronous motion of the gear shape processing method according to the present invention.

FIG. 5 is a side sectional view for explaining the positional relationship between the work and the electrode in the second embodiment of the gear shape machining method according to the present invention.

FIG. 6 is an explanatory view for explaining the positional relationship between the work and the electrode in the second embodiment of the gear shape machining method according to the present invention.

FIG. 7 is a side sectional view for explaining the positional relationship between the work and the electrode in the third embodiment of the gear-shaped machining method according to the present invention.

FIG. 8 is an explanatory view for explaining the positional relationship between the work and the electrode in the third embodiment of the gear shape machining method according to the present invention.

FIG. 9 is an explanatory diagram for explaining an example of the shape of a grinding wheel or a lapping wheel used in the gear shape processing method according to the present invention.

FIG. 10 is an explanatory view for explaining another example of the shape of a grinding wheel or a lapping wheel used in the gear shape processing method according to the present invention.

FIG. 11 is a cross-sectional view illustrating a meshing measurement jig of a gear shape processing method according to the present invention.

FIG. 12 is a low end view for explaining a meshing measurement jig of a gear shape processing method according to the present invention.

[Explanation of symbols]

 1 processing device 2 automatic tool changing device 4 tool 4a electrode 14 work 16 chuck 20 saddle table

Claims (7)

[Claims] 1. A gear-shaped forming electrode is brought close to a rotatably rotatably supported work, and the work and the electrode are synchronously moved in an assumed engagement manner to control a depth of cut between both shafts of the work and the electrode. A method for machining a gear shape, characterized in that a desired gear shape is obtained by performing an electric discharge machining of a work with an electrode while applying. 2. The method for machining a gear shape according to claim 1, wherein the workpiece, which has been subjected to the electric discharge machining, is fixed to the workpiece shaft, and the workpiece is brought into contact with a gear-shaped full-form grinding wheel, whereby the workpiece and the grinding wheel are A method for machining a gear shape, characterized in that a desired gear shape is obtained by grinding a workpiece with a grinding wheel while performing a meshing synchronous movement of the workpiece and controlling the amount of cutting between both axes of the workpiece and the grinding wheel. 3. The gear shape machining method according to claim 2, wherein a desired gear shape is obtained by applying relative reciprocating motion between the workpiece and the grinding wheel in the tooth trace direction of the gear shape to perform grinding. Gear shape processing method. 4. The gear-shaped machining method according to claim 1 or 2, wherein the workpiece, which has been electric discharge machined or ground, is fixed to the workpiece shaft, and the workpiece is brought into contact with a gear-shaped full-form lapping grindstone. It is characterized in that the work and the lap grindstone are engaged in synchronous movement, and while the shaving amount control is applied between both shafts of the work and the lap grindstone, the work is lapped by the lap grindstone to obtain a desired gear shape. Gear shape processing method. 5. The method for machining a gear shape according to claim 4, wherein a relative reciprocating motion is applied between the workpiece and the lapping grindstone in a tooth trace direction of the gear shape to obtain a desired gear shape. Characteristic gear shape processing method. 6. The method for machining a gear shape according to claim 4 or 5, wherein a high-frequency vibration is applied between the work and the lapping wheel in the tooth trace direction of the gear shape to perform lapping to obtain a desired gear shape. A method for machining a gear shape, which is characterized in that it is obtained. 7. Claim 1 or claim 2 or claim 3.
Alternatively, in the gear shape machining method according to claim 4 or claim 5 or claim 6, the workpiece, which has been subjected to electrical discharge machining, grinding, or lapping, is fixed to the workpiece shaft, and the workpiece is a gear shape tooth profile measuring die. A method for machining a gear shape, which comprises engaging a master gear and measuring a shape error between the work and the master gear.