JP2007130706A - Gear machining method using machining center - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the need of machining a clearance groove in a work for a pinion cutter, to restrain increase in machining man-hours, and to smoothly machine a gear from one end of the work to the middle part without the lowering of work rigidity. <P>SOLUTION: X and Y control axes of a machining center are controlled, a spindle on which the pinion cutter T is mounted is revolved along a circle taking the axis of a gear H to be machine in the work W on a table as the center, and simultaneously the C control axis is controlled to rotate the spindle at a fixed ratio corresponding to the revolution amount. After that, Z control axis is controlled to give a cutting feed in the Z-axis direction to the pinion cutter T, whereby in forming a tooth profile of the machined gear H in the work W, after a cutting blade Tc reaches a midway position (forming terminal position of the tooth profile) k2 in the Z-axis direction, the pinion cutter T is moved toward the straight line direction connecting the axis of the machined gear H and the center of the pinion cutter T under the control of the X and Y control axes to continue cutting feed until the cutting blade Tc leaves the work W. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a gear processing method using a machining center that processes a gear with a pinion cutter attached to a main shaft.

Conventionally, a pinion cutter is mounted on a spindle of a machining center whose respective control axes are controlled by a numerical controller, and a workpiece is mounted on a table. The spindle is used to control the center of a gear to be machined by controlling the X and Y control axes of the table. At the same time as moving along the circumferential direction of the center circle, after rotating the main shaft around the C axis at a constant rate according to the amount of movement in the circumferential direction, the pinion cutter is controlled by the Z control axis A gear machining method using a machining center in which a tooth shape of a machining gear is formed on the workpiece by giving a cutting feed in the Z-axis direction by relative movement between the spindle and the table is known (for example, Patent Document 1). , See Patent Document 2).
Japanese Patent No. 3556161 JP 2002-137119 A

In the gear machining method using the conventional machining center, when the gear is machined over the entire length of the workpiece in the Z-axis direction, the pinion cutter penetrates the workpiece in the Z-axis direction and then retracts from the tooth profile surface to the cutting start position. By returning, the tooth profile can be formed without inconvenience and the gear can be machined.
However, when machining a product having a gear from one end to the middle in the Z-axis direction of the workpiece, the pinion cutter stops cutting feed at the end position of the tooth profile at the middle to form the tooth profile. Although it is necessary to evacuate promptly from the surface, it is practically difficult to always stop the pinion cutter accurately at the end position of the tooth profile, and there is a possibility that damage to the pinion cutter or the workpiece occurs due to the occurrence of an impact or the like.
For this reason, when machining the gear up to the middle part of the workpiece, the tooth profile having a predetermined width in the Z-axis direction is usually located at the tip position in the cutting feed direction of the formation end position of the workpiece tooth profile. An annular relief groove deeper than the tooth groove is formed, and the cutting edge of the pinion cutter that has finished cutting feed is penetrated into the relief groove and then retracted from the tooth form forming surface. In this case, it is necessary to process the clearance groove on the workpiece, which increases the number of processing steps and causes a problem that the rigidity of the workpiece decreases due to the clearance groove.

  The present invention has been made in view of the above circumstances, and it is possible to suppress the increase in the number of processing steps of the workpiece by eliminating the processing of the relief groove for the pinion cutter in the workpiece, and to reduce the rigidity of the workpiece. An object of the present invention is to provide a machining method of a gear by a machining center capable of smoothly machining a gear from one end portion to a middle portion of a workpiece.

The present invention controls the X and Y control axes of a machining center by a numerical control device, and the center of the spindle on which the pinion cutter is mounted is a circle centered on the axis of the machining gear to be machined into a workpiece fixed to a table. At the same time, the C control axis is controlled to rotate the main shaft around the axis at a constant rate according to the amount of movement in the circumferential direction, and then the Z control axis is controlled to In a machining method of a gear by a machining center that forms a tooth shape of a machining gear on the workpiece by giving a cutting feed in the Z-axis direction to the pinion cutter,
The pinion cutter is a straight line connecting the axis of the machining gear and the center of the pinion cutter by controlling the X and Y control axes after the cutting edge reaches the formation end position of the tooth profile in the Z-axis direction of the machining gear. The cutting feed is continued until the cutting edge moves away from the workpiece.

  According to the gear machining method by the machining center according to the present invention, the cutting edge of the pinion cutter is moved away from the work while moving the cutting edge of the tooth shape of the machining gear in the cutting feed direction, and the tooth shape of the machining gear is thereby removed. Since it is possible to smoothly evacuate from the forming surface, it is not necessary to process a clearance groove for a pinion cutter on the workpiece even when the tooth shape cannot be formed by penetrating the workpiece in the Z-axis direction. Thus, an increase in the work man-hours of the workpiece can be suppressed, and the gear from one end portion to the middle portion of the workpiece can be smoothly machined without reducing the rigidity of the workpiece.

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an example of a machining center used for carrying out the present invention and a numerical control device for operating the machining center. In FIG. 1, 1 is a general-purpose machining center, and a column 3 is fixed on one side of a bed 2 and a saddle 4 is moved in the Y-axis direction by a Y-axis servo motor 4a on the other side of the bed 2 as in the prior art. The positioning is provided. A table 5 is provided on the saddle 4 so as to be moved and positioned in the X-axis direction by an X-axis servomotor 5a. At the center of the table 5, an indexing table 6 is provided around its central axis so that it can be rotated and indexed by an indexing servomotor 6a. On the index table 6, a workpiece W to be machined is placed.
A spindle head 7 is provided on the front surface of the column 3 so that the spindle head 7 can be moved and positioned in the Z-axis direction by a Z-axis servomotor 7a. The spindle 8 has a spindle 8 that rotates around its axis by a C-axis servomotor 8a. And a pinion cutter T is attached to the main shaft 8.

  A numerical control device 9 for operating the machining center 1 includes a microprocessor 10, and a ROM 12, a RAM 13, a nonvolatile memory 14, an input device 15, and a display device 16 are connected to the microprocessor 10 via a bus 11. The microprocessor 10 controls the rotation of the X-axis, Y-axis, Z-axis, and C-axis servomotors 5a, 4a, 7a, and 8a and the indexing servomotor 6a via the I / O interface 17. The axis position control circuit 18, the Y axis position control circuit 19, the Z axis position control circuit 20, the C axis position control circuit 21 and the index position control circuit 22 are connected to each other.

  The ROM 12 stores a system program for operating the machining center 1 and others, and the microprocessor 10 controls the overall operation of the machining center 1 and the numerical controller 9 according to this system program. The RAM 13 is used as a work area for the microprocessor 10 for processing such as temporary storage of various data. The nonvolatile memory 14 stores an NC machining program for machining gears on the workpiece W by the pinion cutter T, various parameters necessary for the machining, and the like.

  As the above-mentioned various parameters, when machining the internal gear on the workpiece W, as basic items, the number of teeth and pitch circle diameter of the gear (machining gear) H and the pinion cutter T to be machined on the workpiece W, the machining gear 1 The number of times of machining per tooth (number of times of cutting) is set. Further, as other items, the diameter and valley diameter of the machining gear H, the module, the Z-axis feed speed during cutting, and the pinion cutter T escape ( The Z-axis feed speed (at the time of retreating to the machining start position in the Z-axis direction), the angle of the gear cutting start position P1, the machining depth, absolute coordinates, and the like are set.

Next, a method for machining the internal gear (machining gear) H on the workpiece W by the pinion cutter T will be described. 2 and 3 show that a cylindrical workpiece W having a height L is placed on the indexing table 6 of the machining center 1 with its axial direction parallel to the Z axis of the control axis, and the pinion cutter T Is attached to the main shaft 8 so that it coincides with the axis of the main shaft 8 of the machining center 1, the pinion cutter T is reciprocated in the Z-axis direction, and the inner periphery of the workpiece W is cut by the cutting edge Tc on the outer periphery of the pinion cutter T. The surface shows a state in which an internal gear coaxial with the workpiece W is processed over a range of a length L1 extending from the upper end (one end) k1 to a midway position (gear formation end position) k2.
Note that the inner circumferential portion of the workpiece W is not provided with an annular groove J that allows the lower end (tip) of the cutting blade Tc of the pinion cutter T to penetrate through as shown by a broken line on the gear forming terminal side A.

  In machining the internal gear H, for example, the position on the straight line S that is displaced by an angle θ from the X axis of the X and Y coordinate axes passing through the center (axis of the machining gear) c1 of the workpiece W and having the center c1 as the origin. The pinion cutter T with the center c2 positioned along the straight line S so that the outer peripheral part (cutting edge) of the cutting edge Tc is separated from the inner peripheral surface of the work W by a small distance e inward (near the center c1). The lower end of the cutting edge Tc is retracted to the cutting start position z1 separated from the upper surface of the workpiece W in the Z-axis direction by a distance L2. At this time, the pinion cutter T is positioned and fixed around the axis so that the center of the cutting edge of one cutting edge Tc close to the workpiece W is positioned on the straight line S.

  When a machining start command is issued from this state, the cutting edge Tc of the pinion cutter T is moved toward the inner peripheral surface of the workpiece W along the straight line S, and the pitch circle of the pinion cutter T is changed to the inner gear H. After being given a notch f up to a position inscribed in the pitch circle, the pinion cutter T is given a cutting feed motion in the Z-axis direction, and the workpiece W is formed with a tooth profile forming surface based on the notch f by the cutting edge Tc. . When the lower end of the cutting edge Tc is lowered to the midway position k2 of the workpiece W, the pinion cutter T continues the cutting feed to the cutter escape position k3 set at the lower distance L3 while the cutting edge Tc is moved to the straight line. The cutter is moved away from the workpiece W by moving in the direction of the center c1 on S, and then the cutting edge Tc is retracted by a distance e from the top surface of the teeth of the internal gear H (the inner peripheral surface of the workpiece W). To move upward in the Z-axis direction and return the lower end of the cutting edge Tc to the cutting start position z1.

According to the cutter clearance operation during the formation of the tooth profile by the pinion cutter T, the tooth bottom of the internal gear H is located at the lower end side (the front side in the Z-axis direction) at the tooth formation end portion A below the intermediate position k2. It is formed on the slope Q that gradually becomes shallower as it goes to. The inclined surface Q can be formed into a linear inclined surface as shown in the figure or an arcuate concave surface by appropriately selecting the moving speed in the direction of the straight line S with respect to the cutting feed speed of the pinion cutter T. .
It should be noted that, at the cutting start angle position (first processing position) P1 in the circumferential direction of the workpiece W starting from the straight line S displaced by the angle θ, the tooth height (tooth) is obtained by one cut f. Cutting), the cutting resistance becomes too large, so that the cutting f per cutting in the direction of the straight line S is reduced, and the cutting operation is repeated a plurality of times so as to reach the cutting depth for the tooth height. To. In this case, the pinion cutter T repeats the movement of the cutting edge Tc along the inclined surface Q for each cutting operation by the notches f in the tooth-form formation end portion A.

  When the tooth surface is processed at the processing start angle position P1 as described above, the center c2 of the pinion cutter T at the cutting start position z1 in the Z-axis direction is the pitch circle radius of the internal gear H and the pinion cutter T. A pitch angle of the internal gear H (an angle obtained by dividing 360 degrees by the number of teeth n of the internal gear H) α along the circle G centered on the center c1 having a radius corresponding to the difference from the pitch circle radius of It is positioned at the machining angle position (second machining position) P2 (the coordinates (X1, Y1) of the X, Y coordinate axes) moved in the arrow direction. At this time, if the pinion cutter T has a pitch angle (an angle obtained by dividing 360 degrees by the number of teeth m of the pinion cutter T) β, the machining starts by an angle difference between β and α (hereinafter referred to as “angle δ”). From the rotational positioning angle at the angular position P1, the positioning is performed by rotating (spinning) in the direction of the arrow around its own axis.

  Thus, when the cutting position of the cutting edge Tc of the pinion cutter T at the next machining angle position P2 is set by the revolution around the center c1 of the pinion cutter and the rotation around the center c2, the pinion cutter T A cutting f for the height of the teeth of the internal gear H and a cutting feed in the Z-axis direction are given, and the next tooth surface of the internal gear H is cut. In the same manner, each time the pinion cutter T sequentially revolves around the center c1 and is positioned at each processing angle position (each processing position) P1, P2, P3. Then, the cutting of the tooth surface of the internal gear H is repeated, and when the pinion cutter T revolves around the center c1 once, the processing of the internal gear H is completed.

  Note that in the gear machining method, each time it is positioned at a machining angle position (movement position of one tooth of the internal gear H) P1, P2, P3,... Moved by the pitch angle α of the internal gear H, In the above description, the tooth surface is formed by one cutting feed in the Z-axis direction. However, in actuality, each time the internal gear H moves by one tooth, the tooth surface is smoothed by one cutting feed. It cannot be processed into a shape. Therefore, every time the pitch angle α of the internal gear H is subdivided into a plurality of n and the pinion cutter T is revolved and positioned at the machining angle positions p1, p2, p3... Of the subdivided pitch angle Δα, Assuming that the pinion cutter T has a pitch angle Δβ obtained by subdividing the pitch angle β into a plurality of n, the pinion cutter T is rotated and positioned by rotation by an angle difference of Δβ−Δα (hereinafter referred to as “angle Δδ”), and the cutting of each tooth surface is performed by the number of times of cutting. Repeat for n times.

  That is, in this case, each time the pinion cutter T is revolved and positioned at a machining angle position (machining position) corresponding to an n multiple of the number N of teeth of the internal gear H, (β−α) / n Rotational positioning is performed by rotation by an angle, and tooth surface cutting is repeated to process the internal gear H. As a result, each tooth surface of the internal gear H is finished smoothly. Even in this case, according to the relief operation from the workpiece W when each tooth profile is formed by the pinion cutter T, the tooth of the machining gear H is formed at the tooth profile formation terminal side A below the intermediate position k2 of the workpiece W. It is formed on the slope Q that gradually becomes shallower as the bottom goes to the lower end side (the front side in the Z-axis direction).

  Next, a method for processing the gears by controlling the machining center 1 with the numerical controller 9 will be described. The numerical controller 9 is operated, and the input device 15 includes the various parameters, the cutter escape position k3, the moving speed of the pinion cutter T along the straight line S during the escape operation from the workpiece W, and the like. After registering various data to be commanded by the machining program in the nonvolatile memory 14, the machining center 1 is operated. In the numerical controller 9, the microprocessor 10 reads various parameters and data registered in the non-volatile memory 14, and calculates the diameter of the circle G that becomes a trajectory of revolving around the center c1 of the pinion cutter T. Further, the subdivided pitch angle Δα of the internal gear H considering the number of times of cutting n and the subdivided pitch angle (rotation angle) Δβ of the pinion cutter T are subdivided from the subdivided pitch angle Δα and the diameter of the circle G. The coordinates (X1, Y1), (X2, Y2), (X3, Y3) of the center c2 of the pinion cutter T corresponding to the machining angle positions p1, p2, p3,. Is calculated for one round from the angle θ of the gear cutting machining start angle position P1 until machining is completed.

Based on this calculation result and various parameters, the microprocessor 10 commands each axis position control circuit 18, 19, 20, 21 to the movement position with respect to each axis via the I / O interface 17 in accordance with the NC machining program. The shaft position control circuits 18, 19, 20, and 21 operate the X-axis, Y-axis, Z-axis, and C-axis servomotors 5a, 4a, 7a, and 8a.
As a result, the X-axis and Y-axis servo motors 5a and 4a rotate to move and position the table 5 in the X-axis and Y-axis directions, and the X passes through the center c1 of the workpiece W on the indexing table 6. , The center of the main shaft 8 (center c2 of the pinion cutter T) in the Y coordinate system is positioned. When the pinion cutter T is at the machining start angle P1 at the angle θ of the straight line S, first, the pinion cutter T is such that its cutting edge Tc is close to the center c1 by a slight distance e from the inner peripheral surface of the workpiece W. The center c2 is positioned at the machining standby position c (X, Y) on the straight line S. Further, the C-axis servo motor 8a is rotated and the main shaft 8 is rotated and positioned around the axis, and the pinion cutter T is moved to an angular position displaced by an angle φ from the x-axis in the x, y coordinate system passing through the center c2. The cutting blade Tc is positioned.

  Next, the table 5 and the saddle 4 are simultaneously operated by the X-axis and Y-axis servomotors 5a, 4a, and the spindle 8 moves relative to the workpiece W, so that the center c2 of the spindle 8 becomes the center c2. Is moved toward the outer periphery of the workpiece W along the straight line S connecting the workpiece C and the center c1 of the workpiece W, and is positioned at the coordinate position (X1, Y1). It becomes inscribed. Thus, when the cutting edge Tc of the pinion cutter T is provided with a cutting f corresponding to the height of the tooth of the internal gear H with respect to the workpiece W, the Z-axis servo motor 7a is operated, and the spindle 8 Since cutting feed is given at a required cutting speed downward in the Z-axis direction, the tooth profile of the internal gear H from the upper end k1 of the workpiece W to the midway position k2 is formed by one or a plurality of cutting edges Tc.

  When the lower surface of the cutting edge Tc of the pinion cutter T is lowered to an intermediate position k2 of the workpiece W to form a tooth profile, the cutting feed of the pinion cutter T is continued, and the X and Y axis servo motors 5a and 4a are simultaneously operated. When actuated, the axis of the main shaft 8 is moved on the straight line S so as to move away from the workpiece W toward the center c1, so that the tip of the cutting edge Tc of the pinion cutter T changes from the midway position k2 to the cutter escape position k3. It is moved along the inclined surface Q until it is separated from the inner peripheral surface of the workpiece W at the formation end side portion A of the leading tooth profile. Then, when the cutting edge Tc reaches the cutter escape position k3, the cutting edge Tc moves back along the straight line S to the retreat position c3 that is separated from the inner peripheral surface of the workpiece W by the distance e, and then the Z-axis servomotor 7a. Is reversed and the spindle 8 is raised in the Z-axis direction, the pinion cutter T returns to the original cutting start position z1. Thereafter, the X and Y-axis servomotors 5a and 4a are simultaneously operated again, whereby the center c2 of the pinion cutter T is revolved and positioned by the subdivided pitch angle Δα to the next machining angle position p2, The pinion cutter T is rotated and positioned by rotation by Δδ, the cut f is given, the cutting feed is given in the Z-axis direction, and the tooth profile of the internal gear H with respect to the workpiece W is formed in the same manner as described above. .

  In this way, by the operation of the X and Y axis servo motors 4a and 5a, the workpiece W is moved relative to the main shaft 8 at the cutting start position z1 in the Z-axis direction, and the center c2 of the main shaft 8 is set to the center c1. A revolving movement positioning operation is performed for each pitch angle Δα subdivided around the internal gear H, and the pinion cutter of the main shaft 8 at each machining angle position p1, p2, p3... Positioned for each revolving movement. A rotation positioning operation by rotation corresponding to Δδ of T, a cutting feed operation in the Z-axis direction, and a cutter escape operation by movement along the inclined surface Q in the formation end side portion A of the tooth profile of the workpiece W are performed, The cutting of the tooth profile of the internal gear H is repeated, and the cutting of the tooth profile of the internal gear H is completed when the main shaft 8 makes one turn around the center c1.

In the gear machining method by the machining center, when the gear is cut by the cutting edge Tc of the pinion cutter T over the length L1 from the upper end k1 of the workpiece W to the midway position (tooth formation end position) k2, Without stopping the cutting feed of the pinion cutter T at k2, the cutting blade Tc is moved away from the workpiece W while continuing the cutting feed and retracted from the tooth profile surface, so that the pinion cutter T penetrates the workpiece W. Thus, the pinion cutter T does not run in the cutting feed direction and the feed stop position at the tip of the cutting edge Tc in the cutting feed direction does not become unstable as when processing the gear.
Therefore, even if there is no escape groove J for penetrating the pinion cutter T, as shown by a broken line in FIG. The tooth profile can be formed safely and smoothly without generating a workpiece W impact or the like. In addition, as described above, the cutter escape operation in which the cutting edge Tc of the pinion cutter T is moved away from the workpiece W and retracted from the tooth formation surface at the side A of the tooth formation is the command value of the X, Y, and Z control axes. It can be easily executed by appropriately setting the NC machining program.

  As described above, the machining method of the gears by the machining center according to the above-described embodiment controls the X and Y control axes of the machining center 1 by the numerical control device 9, and the axis of the spindle 8 on which the pinion cutter T is mounted is adjusted. The workpiece 8 fixed to the table 5 is moved along the circumferential direction of a circle centered on the axis of the machining gear H to be machined, and at the same time, the C control axis is controlled to move the main shaft 8 in the circumferential direction. By rotating (spinning) around the axis at a constant rate according to the amount (revolution amount of the main shaft 8), the Z control axis is controlled to give the pinion cutter T cutting feed in the Z axis direction, When forming the tooth profile of the machining gear H on the workpiece W, after the pinion cutter T has reached its halfway position in the Z-axis direction of the machining gear H (tooth formation end position) k2, X, By the control of the control shaft, the workpiece is moved in the direction of a straight line S connecting the axis of the machining gear H (the center c1 of the workpiece W) and the center c2 of the pinion cutter T until the cutting edge Tc is separated from the workpiece W. The cutting feed is continued.

  Therefore, according to the gear machining method by the machining center according to the embodiment, the cutting edge Tc of the pinion cutter T is moved away from the workpiece W while being moved in the cutting feed direction from the gear tooth profile formation end position k2, so that the cutting Since the blade Tc can be smoothly retracted from the tooth profile surface of the processed gear H, even if the tooth profile cannot be formed by penetrating the workpiece W in the Z-axis direction, the workpiece W is used for the pinion cutter T. Processing of the annular relief groove J is not necessary, and an increase in the number of processing steps of the workpiece W can be suppressed, and the rigidity of the workpiece W is not reduced, and the gear from the upper end k1 of the workpiece W to the midway position k2 is prevented. Can be processed smoothly.

In the above-described embodiment, the pinion cutter T attached to the main shaft 8 is rotated and positioned around the axis by the C-axis servomotor 8a to process the gear. The present invention can also be applied to processing a gear by rotating and positioning the indexing table 6 on which the workpiece W is placed around the axis of the workpiece W while the motor is stopped. Further, while the relative circular interpolation motion of the spindle 8 relative to the workpiece W and the rotational speed of the spindle 8 are synchronized with a certain common ratio by controlling the X and Y control axes, the spindle 8 is reciprocated in the Z-axis direction at the same time. Therefore, the present invention can also be applied to processing gears with the pinion cutter T.
Moreover, in the said embodiment, although the example applied when processing a gearwheel to the inner periphery of the workpiece | work W was shown, this invention is not limited to this, As shown in FIG. When the gear H1 is machined by forming the inclined surface Q on the side A of the tooth profile formation by the cutter escape operation, when forming the rack on the linear part of the workpiece, when machining the spline groove or spline shaft part Of course, it can also be applied.

It is a systematic diagram which shows the structure of the machining center which implements the gear processing method by the machining center which concerns on embodiment of this invention, and its numerical control apparatus. It is a top view which shows the processing method of the gearwheel by the machining center which concerns on one embodiment of this invention. It is a longitudinal cross-sectional view similarly. It is a longitudinal cross-sectional view which shows the case where an external gear is processed into a workpiece | work with the processing method of the gear by the machining center which concerns on one embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Machining center 4 Saddle 4a Y-axis servo motor 5 Table 5a X-axis servo motor 7 Spindle head 7a Z-axis servo motor 8 Spindle 8a C-axis servo motor 9 Numerical control device 18 X-axis position control circuit 19 Y-axis position control circuit 20 Z-axis Position control circuit 21 C-axis position control circuit A Tooth profile formation end side H, H1 Machining gear Q Slope T Pinion cutter Tc Cutting blade W Work g2 Intermediate position (Tooth profile formation end position)
g3 Cutter escape position

Claims (1)

The X and Y control axes of the machining center are controlled by a numerical controller, and the axis of the spindle with the pinion cutter is placed in the circumferential direction of a circle centering on the axis of the machining gear to be machined on the workpiece fixed to the table. At the same time, the C control axis is controlled to rotate the main shaft around the axis at a constant rate according to the amount of movement in the circumferential direction, and then the Z control axis is controlled to allow the pinion cutter to In a method of machining a gear by a machining center that forms a tooth shape of a machining gear on the workpiece by giving an axial cutting feed,
The pinion cutter is a straight line connecting the axis of the machining gear and the center of the pinion cutter by controlling the X and Y control axes after the cutting edge reaches the tooth forming end position in the Z-axis direction of the machining gear. A machining method of a gear by a machining center, wherein the cutting feed is continued until the cutting blade moves away from the workpiece.

Images