JP2008519699A - Grinding equipment - Google Patents

Abstract

A precision grinding apparatus for grinding a front gear is driven in a controlled state so as to rotate around a central axis, and is controlled in a controlled state so as to rotate around a central axis. And a gear table portion movable in a vertical plane along the axis. The apparatus further includes a face-hardened front gear mounted to the gear table portion. The grinding wheel mounted on the apparatus performs a controlled rotation around the central axis C and has a grinding surface of a predetermined shape. The grinding wheel can move back and forth with respect to the gear in a controlled manner along the feed axis V, the grinding wheel being tangential to the gear and along the tangential feed axis in a direction perpendicular to the feed axis. The movement of the grinding wheel in the C, V, TF axes and the movement of the gears in the B, W axes are controlled by the central control means.
[Selection] Figure 9

Description

  The present invention relates generally to a method and apparatus for the development of a face gear, and more particularly to a method and apparatus for the development of a face gear suitable for high power transmission.

  The development of front gears for high power transmission is relatively recent. Historically, power transmission through a front gear set has been limited to a relatively low level due to two factors: These factors are 1) that the tooth profile of the gears that mesh with each other can be obtained by shaper cutting, and 2) that an acceptable tooth profile can be formed, but that the teeth created by shaping do not have a hard surface. . The tooth profile created by shaping required the resulting front gear set to be kept in almost perfect alignment. In the past, any work performed on the front gear set to harden the shaped tooth surface has tended to distort the shape of the front gear set during the hardening operation.

Previous manufacturing methods for face gears have been developed by the Fellows Corporation. The method uses a gear shaper device and the finished product can be used for low power applications.
The Applicant has previously developed a new method and apparatus for producing a face gear set suitable for high power transmission applications, which method and apparatus are described in US Pat. No. 6,390,894. This document is hereby incorporated by reference in its entirety.
US Pat. No. 6,390,894

  The Fellows method uses a metal cutting process to shape the teeth of the front gear. This process can only be applied to materials with suitable hardness and metal cutting properties. If the material is too hard, the shaper tool cannot cut effectively. This shaping process can only be used effectively to finish cut gear teeth from metal suitable for low power applications. This process does not provide the accuracy and surface finish required for high power applications.

  The present invention relates to a precision grinding apparatus for grinding face gears, which is driven in a controlled manner to rotate about a central axis and moves in a controlled manner in a vertical plane along the axis. It has a gear table portion that can. The apparatus further includes a face-hardened front gear mounted to the gear table portion. A grinding wheel mounted on the apparatus is controlled to rotate around a central axis C and has a grinding surface of a predetermined shape. The grinding wheel can move back and forth with respect to the gear along the feed axis V in a controlled manner, and the grinding wheel can be controlled with respect to the gear in the tangential direction perpendicular to the feed axis V along the tangential feed axis TF. In this case, the movement of the grinding wheel in the C, V, TF axes and the movement of the gears in the B, W axes are controlled by the central control means.

  In an alternative embodiment of the present invention, the apparatus further comprises a feed mechanism for forming teeth on the face gear, such that the face gear traverses the full width of the face face of the face gear. The front gear is moved in the vertical and horizontal compound directions.

  In yet another embodiment, the present invention provides a grinding apparatus for a tapered pinion gear, the apparatus comprising a base with a grinding portion mounted thereon for forming teeth on a gear by polishing. And a gear drive part mounted on the base so as to be juxtaposed to and co-operate with the grinding part, and a surface having pre-formed teeth of a predetermined size and shape attached to the gear drive part. And a tapered pinion gear. In this embodiment, the gear drive portion has the ability to rotate the pinion gear in such a manner that it is controlled by the first CNC control portion in the central axis indicated by B1, and is controlled by the second CNC control portion. In this manner, it has the ability to move the pinion gear up and down on the vertical axis indicated by W. The grinding part has a grinding wheel with a grinding surface with a grinding surface thereon and is rotationally driven by a third CNC control part so as to control the rotation of the grinding wheel in the central axis indicated by C, Be controlled. The grinding wheel also has a fourth CNC control part for controlling the advancing and retracting movement of the grinding wheel relative to the pinion gear along the V-axis, and the grinding wheel movement in the tangential direction with respect to the pinion gear perpendicular to the V-axis along the TF axis. And a fifth CNC control part for controlling. The CNC control parts work together to engage the worm with the teeth of the pinion gear to form teeth on the gears in successive grinding operations.

  Any of the above-described embodiments of the present invention can further include a high pressure temperature coolant device to prevent gear tooth combustion during grinding.

  Returning to the figures where like parts are indicated by like numerals, numeral 10 generally designates a conventional spur gear grinding apparatus. The machine 2 (partially shown) comprises a movable carriage 14 capable of producing a linear movement as indicated by a double-headed arrow 16. The carriage 14 includes a gear drive head 18 connected to the lead shaft 20. The end of the shaft 20 remote from the drive head 18 is centered in a tailstock 22 to stabilize the shaft 20. The spur gear 24 is mounted on the shaft 20 and is rotated in a state controlled by the drive head 18.

  Spur gear grinding wheel 26 is shown engaged with the peripheral surface of spur gear 24. The grinding wheel 26 has the same shape as the grinding wheel 36 shown in FIG. 3 and must be able to move back and forth relative to the gear 24 as indicated by the double-headed arrow 8. The rotation of the grinding wheel functions in harmony with the rotation of the spur gear.

To produce a ground spur gear, the grinding wheel 26 is advanced toward the gear 24, while the gear 24 is ground until the grinding wheel 26 is advanced into the selected region of the spur gear to the desired depth. Synchronously with the “worm” profile on the wheel 26, it is rotated in a step-by-step manner. At this time, the spur gear gradually moves in the axial direction, allowing the grinding wheel 26 to complete grinding along the gear tooth length. Until the tooth dimensions and profile are achieved
This process is repeated for increasing material removal.

FIG. 2 shows a conventional grinding wheel 30 before being dressed to have a grinding profile.
FIG. 3 shows a grinding wheel 36 including a worm profile 38 (used to grind the spur gear teeth as described above), which profile is a specially shaped dressing disc to provide a worm profile. Formed by a dressing tool 40 carrying 42. As the grinding wheel 36 rotates, the dressing tool 40 moves across the surface of the grinding wheel 36. The disk 42 is advanced into the surface of the wheel 36 until the desired tooth shape is achieved. The shape of the profile 38 on the surface of the wheel 36 is formed by the shape of the profile of the grinding disk 42 (i.e. the axis of rotation of the disk 42 is normally parallel to the axis of rotation of the wheel 36).
FIG. 4 shows a plain front gear 50 and a pinion 52 that counters with it. The teeth 54 on the front gear 50 extend radially; the teeth 56 on the pinion 52 are parallel to the axis of rotation of the pinion 52.

FIG. 5 shows the front gear 50 and the pinion in cross section. Teeth 54 and 56 are shown in an engaged state.
FIG. 6 shows a conventional method of shaping the teeth of the front gear 50 by the shaper cutter 60. The shaper cutter 60 reciprocates in the axial direction (as indicated by arrow 62), during which time the front gear 50 and the shaper cutter 60 continuously move in a simulated meshing engagement until the desired tooth shape is obtained. .

  FIG. 7 illustrates a face gear working head 68 and a face gear grinding head 100 constructed in accordance with the teachings of the present invention. The embodiment shown in FIG. 7 is used to grind the teeth of a normal, convex or concave front gear. In the figure, the convex front gear 70 is shown mounted on a turntable 72 that can be controlled to rotate about an axis 74. The rotary table 72 is directly attached to the CNC drive motor 80. The motor 80 acts to drive the rotary table 72 and is directly attached to the base 76. The front gear working head 68 can pivot about a pivot axis 78. The degree of turning of the front gear working head 68 is strictly controlled by the turning selector 108 shown in FIG. The entire rotating face gear head 68 is preferably capable of a controlled movement in the vertical direction during the tooth grinding operation, as indicated by arrow 90. CNC control allows controlled movement in the vertical axis. In the example shown, the rotational axis of the gear is maintained in a horizontal orientation during grinding.

  The grinding head 100 has a grinding wheel 102 rotatably mounted thereon. The grinding head 100 is accurately positioned with respect to the front gear working head 68 and the grinding wheel 102. The entire grinding head 100 must be able to perform a controlled movement in the horizontal direction during the tooth grinding operation, as indicated by arrow 210. CNC control allows controlled movement in the horizontal axis.

  The grinding wheel 102 has a special worm profile 268 (see, eg, FIGS. 10 and 15), and the grinding operation involves the meshing of the grinding wheel profile 268 and the front gear precisely (ie, the worm of the grinding wheel 102 is in front of the front gear 70). This is carried out by advancing the grinding wheel 102 towards the front gear 70 so that it has a profile that meshes with the other teeth. The feed mechanism for generating the teeth of the front gear 70 slowly moves the front gear 70 in the vertical and horizontal compound directions until the grinding wheel has traversed the entire width of the tooth surface 71 of the front gear 70. The grinding wheel 102 is progressively advanced into the surface of the tooth surface 71 of the face gear 70 in each successive pass until the desired tooth profile is obtained.

  FIG. 8 shows an example of the shape of a front gear that can be ground by the present invention. Normal face gear 50, convex face gear 70 and concave face gear 106 can all be ground using the teachings of the present invention. The criteria used to determine the face gear type include an angle measurement between the gear tooth surface 71 and the gear rotation axis 82. Although not shown in this drawing, the present invention can also grind a pinion gear described in detail later.

  FIG. 9 shows a complete grinding machine 200 constructed in accordance with the teachings of the present invention. A base 202 is provided and the front gear working head 68 can be mounted on the base in a predetermined manner. This device drives a rotary table 72 with a front gear 70 mounted thereon in a controlled manner about its axis (axis indicated by “B”). The rotary table 72 is directly attached to the CNC drive motor 80. The motor 80 drives the rotary table 72 and is directly attached to the base 76. The base 76 is mounted on a work table 214 that allows the front gear work head 68 to pivot about the work table 214 mounting point. This allows the front gear to have a manually adjustable angular swivel setting shown as the “WTS” axis. The work table 214 is forcibly moved by the drive motor 222 along the rail 216 in a vertical plane. This vertical axis is shown as the “W” axis.

  The grinding head 100 on which the grinding wheel 102 is mounted is such that the grinding wheel 102 can move forward and backward with respect to the front gear working head 68, and the grinding wheel 102 can likewise move tangentially with respect to the working head 68. Then, it is attached to the base 202. The grinding head 100 can move along the rail 259 to cause the carriage 254 to move back and forth relative to the front gear working head 68. This is the free axis and is shown as the “V” axis. The carriage 254 is also mounted on the rail 252 so as to cause movement of the grinding wheel 102 in a tangential direction with respect to the front gear 70. This axis is shown as the “TF” axis. The grinding table 258 can pivot the carriage 254 about the pivot axis 260. This is the grinding wheel pivot axis and is shown as the “WT” axis. Grinding wheel 102 rotates about an axis indicated as axis “C” and is driven by a motor 262 mounted integrally with carriage 254. The grinding wheel 102 has a predetermined profile drawn on its surface as shown in FIG. Another view of the grinding machine of FIG. 9 is provided in FIGS.

  During the initial assembly of the machine 200, the axes “TF” and “WT” are set and locked with respect to the tooth shape already present on the face gear 70. (The front gear 70 has already undergone tooth shaping and surface hardening operations before being mounted on the machine 200.) During the initial approach of the grinding wheel 102 to the front gear 70, the motor 262 grinds about the axis "C". The wheel 102 is rotated, and the motor 80 rotates the front gear 70 around the axis B. The rotation of the axes “C” and “B” takes place in a defined and synchronized manner. Carriage 254 is fed along the “V” axis to carry grinding wheel 102 toward face gear 70 until the desired grinding position is reached. During grinding, the front gear table 214 is controlled along the feed axis “W” until the grinding wheel has moved enough for the entire tooth surface 71 of the front gear 70 to be traversed by the grinding wheel 102. In response, the grinding head 100 undergoes a controlled movement along the feed axis “V”. The grinding wheel 102 is then moved slightly toward the table 214 until the desired depth of the tooth profile and shape is obtained, and the search operation is repeated.

  The rotating diamond dressing tool assembly 264 is also mounted on the grinding table 258 along the rail 256. The assembly 264 has a rotating device 266 that rotates a disk 280 (see FIG. 10) impregnated with diamond. The disk 280 is used (by polishing) to generate a defined shape on the grinding wheel 102. The device 266 can be adjusted in height and angle on and around the post 270 fitted with the device 266. The entire dresser assembly 264 is mounted on the table 258 for controlled movement in three axes. The first motion axis allows the dresser assembly mounted on the feed table 274 to move back and forth relative to the grinding wheel 102 along the rail 272. This axis is shown as the “Y” axis.

  Translational movement of the dressing tool assembly 264 along the rail 256 (parallel to the axis of the grinding wheel 102) is shown as the "X" axis. The angular manner movement of the dresser wheel 280 about the post 270 defines an angular axis “A”. The grinding wheel profile is such that the movement of the feed table assembly 274 for the dresser assembly 264 is synchronized with the rotation of the grinding wheel 102 so that the disk 280 of the dresser assembly 264 properly engages the profile of the grinding wheel 102. Request.

The grinding operation of the partially completed and hardened face gear 70 is as follows:
The turntable 72 is manually set to have a predetermined tilt (WTT) and turn (WTS) setting, and these positions are locked. The partially finished gear is mounted on the rotary table 72 so as to have a predetermined angular position on the axis “B”. The grinding wheel carriage 254 is then set at an appropriate angle on the pivot axis WT and locked. The carriage 254 moves along the rail 252 until the grinding wheel 102 is set to a predetermined position on the “TF” axis with respect to the front gear 70.

  At this time, the rotating grinding wheel 102 is moved along the “V” “feed” axis so as to move toward the rotating front gear 70 partially finished in the horizontal direction. The rotating front gear 70 is then moved along the “W” “feed” axis towards the point of engagement with the rotating grinding wheel in the vertical direction. These linear axes can be moved independently or simultaneously under CNC control to achieve an initial face gear grinding position.

  The work table 214 then moves vertically along the rails 216 to perform the grinding of the front gear 70 and allow the grinding wheel 102 to traverse the full width of the tooth surface 71 of the gear 70. As will be apparent to those skilled in the art having read this disclosure, the combined CNC motion of the “V” and “W” feed axes causes the face gear manufacturing equipment to grind various face gear shapes (from concave to convex). It can be so. This process is repeated as a series of grinding passes until the desired dimensions and tooth shapes are obtained in the face gear 70.

  During the grinding operation, the profile of the grinding wheel 102 must be restored periodically. When this is necessary, the grinding wheel 102 is pulled back from the face gear 70 and the dresser assembly 264 engages the grinding wheel 102 to restore the wheel 102 profile to its original profile, 256 to the right place. The grinding disk 280 is engaged with the grinding wheel 102 according to CNC control to move in a controlled manner to restore the profile 268 of the wheel 102 to the required size and shape.

  FIG. 14 shows the apparatus of FIG. 9 modified to allow finish grinding of the pinion gear 300. In this example, the pinion 300 is a tapered spur gear. Here, the grinding wheel 302 carries a profile that is significantly different from the profile drawn on the surface of the grinding wheel 102 for face gear grinding. The profile drawn on the surface of the wheel 302 is similar to that shown in FIG.

The front gear working head 68 of FIG. 9 is replaced by a work table 304, which supports and rotates the pinion 300 during grinding.
Tapered pinion 300 rotates about an axis indicated as “B1” in an angular motion synchronized with grinding wheel 302. The work table assembly 304 can perform a vertical translation along a rail 216 shown as a “W” axis as previously described with respect to FIG. The movement of the grinding wheel 302 along the “V” axis is CNC controlled, similar to the movement of the pinion 300 along the “W” axis. As will be appreciated by those skilled in the art, the movement of the grinding wheel 302 in the “V” axis must be carefully coordinated with the movement of the table 304 along the rail 216 to produce the tapered spur gear pinion 300.

The dresser device for grinding wheel 302 needs to be as described above, but is omitted from FIG. 14 for clarity.
It is further contemplated that any front gear grinding apparatus of the present invention can include a high pressure temperature controlled coolant device to prevent burning of the gear teeth during grinding.

  The axes defined here are:

Basic Operation of a Face Gear Grinding Machine FIG. 11 provides a top view of a face gear grinding machine constructed in accordance with the teachings of the present invention. The machine 200 utilizes a CNC device that can move the axis under its control in a predetermined manner through a series of instructions in the program. A number of programs are used to control the dressing cycle and gear grinding cycle of machine 200 for different gear shapes. The CNC control can continuously synchronize the motion axis even when the dressing cycle and the grinding cycle are switched.

Manual setting The swivel “WTS” of the work table 212 is normally set in the vertical position and locked for the gears described here. This feature is incorporated for the requirement of a helical gear shape. The inclination “WT” of the grinding wheel 102 is set for lead angle compensation. Grinding wheel tangential feed "TF" positions the wheel with respect to the central axis of the gear in the horizontal plane. When CNC controlled, this feature is incorporated for helical gear shape requirements. The tilt of the dresser rotator 266 is set for the angular clearance “DT” and the centerline height “DH” of the diamond disk 280 grinding wheel 102.

CNC controlled grinding wheel dressing A CNC program stored in a CNC controlled memory is selected to control this process. These programs command the movement of the dresser axes X, Y, A and the axis C of the grinding wheel 102 in a defined manner so as to generate the required shape on the grinding wheel. These programs control the rotational speed and direction of the grinding wheel 102 with respect to the movement speed and direction of the axes X, Y, A of the dresser assembly 264.

Via the CNC and the selected program, the rotational speed of the grinding wheel 102 (axis C) with respect to the rotational speed of the gear 70 (axis B) being ground is controlled. This relationship is controlled via an electronic gearbox, which is a feature of CNC. This is an important feature for a grinding process that simulates the meshing between a worm gear, which is the grinding wheel 102, and a face gear, such as 70, which is the gear being finish ground. The following functions are also controlled via the program and the CNC:
The depth of cutting (axis V), which is the feeding of the grinding wheel 102 to the workpiece (front gear 70);
Vertical feed of the workpiece across the grinding wheel 102 (axis W);
Tangential feed (TF), which is the positioning of the grinding wheel 102 with respect to the workpiece (front gear 70);
The speed of the dresser diamond disk 280;
Control of the X, Y, A axes of the movement of the dresser for initial and periodic redressing of the grinding wheel 102;
Dimensional offset and adjustment; and coolant on / off and machine lubrication.

Examples of basic material compositions for the gear 70 that can be successfully used to practice the present invention are as follows:
(A) SAE9310 having the following components
Iron 94.765%
Nickel 3.25%
Chrome 1.20%
Manganese 0.55%
Molybdenum 0.11%
Carbon 0.10%
PYROWEAR Alloy 53 with up to 0.045% silicon; or (b)
Iron 90.2%
Molybdenum 3.25%
Copper 2.00%
Nickel 2.00%
Chromium 1.00%
Silicon 1.00%
Carbon 0.1%
Vanadium 0.1%
The foregoing descriptions of the embodiments of the present invention have been presented for purposes of illustration and description, and are not exhaustive or limit the invention to the precise forms disclosed. Not a thing. The description is provided to illustrate the principles of the invention and the practical application of the principles so that others skilled in the art can best utilize the invention in various embodiments and with modifications suitable for a particular use. Was chosen to best explain. The gist of the present invention is not limited by the specification, but is defined by the claims.

It is an elevation view of a conventional spur gear cutting machine. FIG. 2 is a partial view of a conventional material grinding wheel (before the wheel is shaped). FIG. 2 is a partial view of a spur gear grinding wheel showing a dressing tool used to provide a cutting profile. It is a perspective view of a front gear and a pinion gear which counters with this. It is sectional drawing of the pinion and front gear which meet. It is sectional drawing of the conventional front gear shaping apparatus. 1 is an elevational view of a grinding apparatus of the present invention adapted to grind the teeth of ordinary, concave and convex front gears. FIG. 6 is an illustration of an exemplary average concave and convex face gear. 1 is a perspective view of a completed grinding machine for grinding concave face gear teeth constructed in accordance with the teachings of the present invention. FIG. FIG. 3 is a plan view of the grinding wheel of the present invention showing the movement of the associated dressing device. 1 is a plan view of a grinding machine constructed in accordance with the teachings of the present invention. FIG. 3 is a spatial layout of three major elements of a face gear machine constructed in accordance with the teachings of the present invention to more clearly show the axes of the various elements. FIG. 3 is a spatial layout of the three main elements of a face gear machine constructed in accordance with the teachings of the present invention, adapted to produce pinion gear teeth. It is a perspective view of the front gear grinding apparatus which came to manufacture the tooth | gear of a pinion gear. 1 is an elevational view of a grinding wheel showing a typical front gear shape used in the present invention. FIG. 10 is an end view of the machine of FIG. 9. FIG. 10 is an elevational view of the machine of FIG. 9.

Claims (18)

In precision grinding equipment for grinding front gears,
A suitable gear table portion which is driven in a controlled manner to rotate about a central axis and which can be moved in a controlled manner in the vertical plane V along the axis;
A face-hardened front gear mounted to the gear table portion and having a series of gear teeth formed therein;
It is mounted on the device, performs a controlled rotation around the central axis C, has a grinding surface of a predetermined shape, and moves forward and backward with respect to the gear in a controlled manner along the feed axis V. A grinding wheel capable of being moved in a controlled manner in a controlled manner in a direction tangentially towards the gear and with respect to the gear in the direction perpendicular to the feed axis V along the tangential feed axis TF;
Have
A precision grinding apparatus characterized in that the movement of the grinding wheel in the C, V and TF axes and the movement of the gear in the B and W axes are controlled by a central control means. A dressing device is mounted on the device in a predetermined relationship to the grinding wheel, the dressing device comprising:
A driven grinding disc having a second predetermined shape for controlled movement back and forth relative to the grinding surface of the grinding wheel along the Y axis, the disc being Mounted on the apparatus for movement along an axis X substantially parallel to the C axis;
The X axis is perpendicular to the Y axis, and the disk can also make an angular motion about a central dressing axis A;
The movement in the X, Y, A axes being interlocked by and below the central control means to produce the grinding surface of the grinding wheel and to restore the surface to the predetermined shape. The precision grinding apparatus according to claim 1, wherein the precision grinding apparatus is characterized.   2. The precision grinding according to claim 1, wherein the grinding surface meshes with a gear tooth existing on the gear, and is shaped as a worm shape for grinding the gear tooth into a predetermined finish shape. apparatus.   2. The grinding wheel is movable in a direction tangential to the gear and along an axis TF perpendicular to the V-axis, and the grinding wheel can be tilted about a tilt axis WT. The grinding apparatus described in 1.   5. The grinding apparatus according to claim 4, further comprising dressing means for generating and restoring the worm profile of the grinding wheel.   The grinding apparatus according to claim 1, wherein the grinding wheel is movable along an axis TF tangential to the gear, and the grinding wheel can be tilted about a pivot axis WT.   A feed mechanism for generating teeth on the front gear, the feed mechanism in a combined vertical and horizontal direction so that the front gear traverses the entire width of the tooth face of the front gear; The grinding apparatus according to claim 1, wherein the grinding apparatus is moved.   2. The grinding apparatus according to claim 1, wherein the central control means is computer numerical control (CNC).   2. The grinding apparatus according to claim 1, wherein the apparatus is arranged to generate gear teeth having a shape selected from a group consisting of a concave shape and a convex shape.   The grinding device according to claim 1, further comprising a coolant device.   11. The grinding apparatus according to claim 10, wherein the coolant apparatus is a high-pressure temperature controlled coolant apparatus configured to prevent combustion of the teeth during grinding. In precision grinding equipment for tapered pinion gears,
A base having grinding portions mounted thereon for generating teeth on the gear by polishing;
A gear drive means mounted on the base in juxtaposition with the grinding part and cooperating with the grinding part;
A hardened surface tapered pinion gear mounted on the gear drive and having pre-formed teeth of a predetermined size and shape;
Have
The gear drive part has the ability to rotate the pinion gear in such a manner that it is controlled by the first CNC control part in the central axis indicated by B1, and the gear drive part is also controlled by the second CNC control part. In the vertical axis indicated by W in such a manner, the ability to move the pinion gear up and down,
The grinding part has a grinding wheel on it with a grinding surface on which a worm of a predetermined shape is generated, said grinding wheel controlling the rotation of the grinding wheel at its central axis indicated by C Is driven and controlled by a third CNC control portion, and the grinding wheel is further operative to control the forward and backward movement of the grinding wheel relative to the pinion gear along the X axis. A fourth CNC control portion associated with the grinding wheel, wherein the grinding wheel further controls movement of the grinding wheel in a direction tangential to the pinion gear along the TF axis and perpendicular to the V axis. A fifth CNC control portion operatively associated;
Grinding apparatus characterized in that the CNC control parts work together to engage the worm with the teeth of the pinion gear to form teeth in the gear in a continuous grinding operation.   13. The grinding wheel portion can move along an axis indicated by TF that is tangential to the gear, and the grinding wheel portion can be tilted about a pivot axis indicated by WT. The grinding apparatus described in 1.   In a manner that is controlled by three additional CNC control parts to generate the worm and to restore the worm to its predetermined shape when there is a predetermined amount of distortion in the worm. 14. The grinding apparatus of claim 13, further comprising a grinding wheel dressing portion mounted in a cooperative relationship with the grinding portion so as to engage the grinding surface. The above three additional CNC control parts are:
A sixth CNC control portion operatively associated with the dressing portion to control the advancement and retraction of the dressing portion relative to the grinding surface along the axis indicated by Y;
A seventh CNC control portion operatively associated with the dressing portion to control movement of the dressing portion along an axis indicated by an X substantially parallel to the C axis;
An eighth CNC control portion operatively associated with the dressing portion to control the angular movement of the dressing portion about the pivot axis indicated as A;
The grinding apparatus according to claim 14, comprising:   15. The disk of claim 14, wherein the dressing portion comprises a disk with a predetermined shape that is adapted to engage the surface of the grinding wheel to restore the shape of the worm by polishing. Grinding equipment.   The grinding device according to claim 12, further comprising a coolant device.   18. The grinding apparatus according to claim 17, wherein the coolant apparatus is a high pressure temperature sensitive coolant apparatus configured to prevent burning of the teeth during grinding.

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