JP2002079442A - Grinding method and device for rotary saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly grind each tooth of a rotary saw with high accuracy. SOLUTION: This grinding device comprises a pitch measuring device 10 for measuring and storing a pitch of each tooth 5 of the rotary saw 3, a tooth sending device 6 for indexing and rotating the rotary saw 3 on the basis of a measured value, a grinding wheel 21 for grinding the tooth 5 sent to a predetermined position, and a grinding wheel attitude changing device 24 for changing the direction of the grinding wheel 21 to locate its grinding face oppositely to a predetermined face of the tooth 5, the rotary saw 3 is repeatedly rotated by the tooth sending device 6 on the basis of the data from the pitch measuring device 10 obtained in the initial rotation of the rotary saw 3, and the direction of the grinding wheel 21 is changed by the grinding wheel attitude changing device 24 every rotation of the rotary saw 3 to grind corresponding faces 5a, 5b of the tooth 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary saw grinding method and a grinding apparatus for grinding a flank, a rake face and the like of teeth of a rotary saw.

[0002]

2. Description of the Related Art In general, the teeth of a rotary saw have various kinds of surfaces such as a rake face and a flank face for forming cutting teeth. Conventionally, when grinding (polishing) these surfaces, the reference pins are protruded and retracted toward the teeth until all the types of surfaces of the teeth are completely ground, and the teeth are positioned on the reference pins for each tooth. Then, the rake face, flank face and the like of the positioned teeth are ground.

[0003]

In the above prior art, the teeth are positioned one by one with the reference pins until the grinding of each type of tooth is completed, so that the grinding time is extended. At the same time, the reference pin is easily worn. The present invention solves the above problem by storing each pitch of the teeth in the first rotation of the rotary saw, repeatedly rotating the rotary saw based on the stored data, and grinding each surface of the teeth of the rotary saw. It is intended to be. In addition, by detecting the teeth with a laser sensor and feeding the rotary saw to the teeth, the tooth feeder can be simplified and highly accurate grinding can be performed without being affected by the size of the lateral rake angle of the teeth. It is an object of the present invention to obtain a novel rotary saw grinding method and a new grinding apparatus.

[0004]

Means for Solving the Problems The present invention is configured as follows to achieve the above object. That is, the invention according to claim 1 includes a pitch measuring device that measures and stores the pitch of each tooth of a rotating saw to be rotated, and a tooth feed device that indexes and rotates the rotating saw based on the measured value. A grinding wheel for grinding a tooth fed to a predetermined position by the tooth feeding device, and a grinding wheel attitude changing device for changing the direction of the grinding wheel so that the grinding surface faces the predetermined surface of the tooth; The rotary saw is repeatedly rotated by the tooth feeder based on the data of the pitch measuring device obtained in the first rotation of the first time, and the direction of the grinding wheel is changed by the grinding wheel attitude changing device every time the rotary saw is rotated once. In this configuration, a ground surface faces a corresponding surface of the tooth. According to a second aspect of the present invention, in the pitch measuring device, a driving amount of a servo motor of the gear feed device for rotating the rotary saw and a laser sensor for irradiating a laser beam toward the teeth of the rotary saw arriving at the grindstone portion. , The pitch of each tooth of the rotary saw is measured and stored. Also,
The invention according to claim 3 is provided with a gear feed device for indexing and rotating a rotary saw on a frame, and rotating the frame about a grinding center parallel to a rotation axis of the rotary saw at a predetermined tooth portion of the rotary saw. A rotating table that moves, an X-axis moving base that moves in a radial direction with respect to a rotating circle of the rotating table, and the X-axis moving base rotates around a moving axis of the rotating table. The turning table is provided with a grindstone head that rotates about an axis orthogonal to the center of rotation of the turning table, and the tooth feed device irradiates a laser beam toward the teeth of the rotary saw arriving at the grinding center. A laser sensor is provided, and a servomotor for inputting a signal from the laser sensor and indexing and rotating the rotary saw is provided.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is a side view of a main part of a rotary saw grinding apparatus showing an embodiment of the present invention, FIG. 2 is a front view showing a flank grinding state according to the present invention, and FIG. 3 is a rake face grinding according to the present invention. FIG. 4 is a front view showing a state where the flank is ground, FIG. 5 is an enlarged view of a main part of FIG. 2, and FIG. 6 is an enlarged view of a main part of FIG. 1 to 3, 1
Is a rotary saw grinding device, and 2 is its frame. A rotary saw 3 is provided on the frame 2, and the rotary saw 3 is
For example, index rotation is performed for each tooth. As shown in FIG. 5, the rotary saw 3 has a number of teeth 5 made of carbide tips at a predetermined pitch on the outer periphery of a disk-shaped substrate 5.

[0006] As shown in FIG.
The rotary saw 3 is indexed and rotated in accordance with the pitch of each tooth 5 by a tooth feed motor (servo motor) 7 whose rotation is controlled by a pitch measuring device 10.
That is, as shown in FIG.
The emitter 11a and the light receiver 11b of the laser sensor 11 are arranged on both sides of the teeth 5 of the rotary saw 3 arriving at the grinding reference point O, and the rotary saw 3 is rotated by the tooth feed motor 7 to rotate the respective teeth 5a. Is passed between the emitter 11a and the light receiver 11b, the signal of the laser sensor 10a and the signal of the tooth feed motor 7 are input, and the pitch of each tooth 5 is calculated (measured) and stored. It has become. When grinding the teeth 5 of the rotary saw 3, the signal of the pitch measuring device 10 is input to control the rotation of the tooth feed motor 7, and the rotary saw 3 is made to correspond to the pitch of each tooth 5. Rotate indexing.

A grinding wheel head 20 is provided on the frame 2 via a grinding wheel attitude changing device 24. The grindstone attitude changing device 24 is configured such that the direction of the grinding surface of the grindstone 21 provided on the grindstone head 20 is a predetermined surface of the tooth 5, for example, the flank 5a or the rake surface 5.
It is changed so as to face b and the like, and is as follows. That is, the turntable 15 is rotatably mounted on the frame 2 via the fulcrum shaft 15 a parallel to the rotation axis of the rotary saw 3 on the grinding reference point O, and the turntable 15 is turned by the turning device 16. Rotate. The rotation device 16 has a rotation motor 18 composed of a servomotor mounted on the frame 2 side, and a worm 18a mounted on an output shaft of the rotation motor 18 meshed with a worm wheel 18b mounted on the fulcrum shaft 15a. By rotating the rotating motor 18 in the forward and reverse directions, the rotating table 15 is rotated forward and backward in the direction of arrow M shown in FIG. Reference numeral 17 denotes a guide rail for guiding the turntable 15, which extends in an arc shape centered on the fulcrum shaft 15 a and slidably connects the outer peripheral portion of the turntable 15 to the frame 2 side.

[0008] As shown in FIG.
The main shaft 20a is arranged in the direction of the arrow Y axis which is tangential to the rotation circle of the rotation table 15, and the head moving device 2
5, the rotary table 15 is moved in the X-axis direction and the Y-axis direction, which are the radial directions of the turning circle, and is turned by the turning device 33 about the axis L parallel to the X axis. The head moving device 25 includes an X-axis head moving device 26 that moves the grindstone head 20 on the turntable 15 in the radial direction (X-axis direction) of the turning circle, and moves the grindstone head 20 on the turntable 15. And a Y-axis head moving device 30 for moving in the tangential direction (Y-axis direction) of the rotating circle.

The X-axis head moving device 26 includes a rotary table 1
5, an X-axis moving base 27 is slidably mounted in the radial direction of the turning circle of the turntable 15, and the X-axis moving base 27 is controlled to move by an X-axis motor 28 comprising a servomotor. , The Y-axis head moving device 30
A Y-axis motor consisting of a servomotor is mounted on the axis-moving base 27 so that the Y-axis moving base 31 is slidable in a direction perpendicular to the moving direction of the X-axis moving base 27 (tangential direction of the turning circle of the turntable 15). 32 (FIG. 3).
In FIG. 1, reference numeral 29 denotes a sensor for detecting the movement of the X-axis movement base 27. The turning device 33 fixes a bracket 37 to the Y-axis moving base 31 in an upright position, and a turning motor (servo motor) 3
6 is controlled to rotate about the X axis
Is rotatably mounted, and a revolving base 35 bent in a U-shape is fixed to the revolving shaft 34.

A second Y-axis moving base 41 is mounted on the swivel base 35.
Is mounted so as to be slidable in the Y-axis direction, and the above-mentioned grindstone head 20 is disposed on the second Y-axis moving base 41 such that the lower end thereof is located on the grinding reference point O of the turntable 15 in FIG. Attach. The second Y-axis moving base 41 is moved by a second Y-axis motor 42 (FIG. 2) composed of a servomotor.
It is moved in the axial direction, and as shown in FIG.
The eccentricity R of the a, 23a with respect to the turning axis L is adjusted.
The main shaft 20a of the grindstone head 20 is provided at the rear side of the turntable 35.
Is mounted, and the main shaft 20a is rotated via a belt and a pulley by the grinding wheel motor 20b.

The grinding stone 21 attached to the spindle 20a is
As shown in FIGS. 5 and 6, a large-diameter and dish-shaped first grindstone 22 expanding outward in the axial direction, and a small-diameter and cylindrical-shaped superimposed on the axially outer surface side of the first grindstone 22. A second grindstone 23. The first grindstone 22 is for grinding the rake face 5b of the teeth 24. The first grindstone 22 is formed in a thin disk shape on its outer periphery, and abrasive grains are fixed to its axially outer end face to form a main spindle 20b.
A first grinding surface 22a is formed, which is a surface orthogonal to the rotation axis of a. The second grinding stone 23 is provided on the flank 5 of the tooth 5.
The second grinding surface 23a is formed by fixing abrasive grains to the outer end in the axial direction.

The above-described tooth feeder 6 and the grindstone attitude changing device 24, that is, the rotating device 16, the grindstone head 20, the head moving device 25, and the turning device 33 are driven and controlled by a control device 50 shown in FIG. You. In FIG. 9, 51
Is a grinding mode setting section stored in a memory section of the microcomputer, for example, a flank grinding mode for grinding the flank 5a of the tooth 5, a rake face grinding mode for grinding the rake face 5b, the flank 5a or the rake A surface grinding mode in which the surface 5b is ground into a plane, a curved surface grinding mode in which the flank 5a or the rake surface 5b is ground into an arc shape, and the like are set. This setting is performed by an operator operating a keyboard or the like.

Reference numeral 52 denotes a grinding command section, which issues drive commands in a predetermined order to each drive section in accordance with a predetermined grinding mode set by the grinding mode setting section 51. Reference numeral 53 denotes a tooth pitch measuring unit which operates the pitch measuring device 10 according to a command from the grinding command unit 52 to measure and store the pitch of each tooth 5 of the rotary saw 3 rotated by the tooth feed motor 7. Reference numeral 54 denotes a tooth feed unit. When the command from the grinding command unit 52 is a tooth pitch measuring step, the tooth feed motor 7 is rotated at a speed suitable for pitch measurement. Is a grinding process, the tooth feed motor 7 is connected to each tooth 5.
Is intermittently rotated at a rotation angle that is the pitch measured (stored) by the tooth pitch measuring unit 53. Reference numeral 55 denotes a grindstone attitude changing unit which controls the driving of the rotation motor 18, the X-axis motor 28, the Y-axis motor 32, the turning motor 36, the second Y-axis motor 42, and the like according to a command from the grinding command unit 52.
Face the flank 5a or the rake face 5b.

FIG. 10 is a flowchart showing an example of the operation of the control device 50. This will be described with reference to FIGS. In FIG. 10, P1 to P23 indicate each step in the flowchart. In FIG. 10, when the process is started in step P1, the gear feed motor 7 is rotated at a predetermined speed in P2, and the pitch measuring device 10 is operated in P3. That is, each tooth 5 of the rotary saw 3 passing between the emitter 11a and the light receiver 11b of the laser sensor 11 is detected, and the pitch of each tooth 5 is measured (calculated) from this and the driving amount of the tooth feed motor 7. I do. And each tooth 5 measured above at P4
Is stored.

When the measurement of the pitch of each tooth 5 is completed in P5, it is determined in P6 whether surface grinding or curved surface grinding (P22). In the case of surface grinding, flank grinding or rake surface grinding (P17) is performed in P7. ) Judge. P8 for flank grinding
And the grindstone attitude changing device 24 is operated. That is,
The rotation motor 34 is activated to rotate the rotation table 15 to the position shown in FIGS. 2 and 5, and the second Y-axis motor 42
To move the grindstone head 20 in the Y-axis direction (grindstone 2
The second grinding surface 23a is offset by a predetermined amount with respect to the turning shaft 34), and the grinding wheel 21 is moved to the second grinding surface 23 at P9.
At a position where the angle of a corresponds to the predetermined tip clearance angle C required for the flank 5a (FIG. 7) of the teeth 5, and at P10, the cut amount of the second ground surface 23a becomes the predetermined cut amount H1. Move to position.

Next, at step P11, the grinding wheel 21 is rotated via the grinding wheel motor 20b, and at steps P12 and P13, the tooth feed motor 7 is rotated.
Is started by a predetermined amount and index rotation is performed so that the tooth 5 to be ground reaches the position of the grinding reference point O. Then, at step P14, the tooth feed motor 7 is stopped, and a braking device (not shown) is operated. The rotary saw 3 is fixed to the frame 2 side.
Next, at P15, the X-axis motor 28 is started to grind the teeth 5. Next, at P16, the flank 5 of each tooth 5 of the rotary saw 3
It is determined whether or not the grinding of a is completed. If NO (No), the process jumps to P12, and if YES, the process proceeds to P21. Here, the surface grinding, that is, the flank 5a of each tooth 5, and the rake It is determined whether the grinding of the surface 5b has been completed.

If NO in P21, the process jumps to P7 and proceeds to P17. If YES, the process proceeds to P23 to terminate the surface grinding. When proceeding to P17, the grindstone attitude changing device 24 is operated at P18, that is, the turning motor 34 is started to rotate the turning table 15 to the position shown in FIGS. 3 and 6, and the second Y-axis motor 42 is turned on. Upon activation, the grinding wheel head 20 is moved in the Y-axis direction (the first grinding surface 22a of the grinding wheel 21 is offset by a predetermined amount with respect to the turning shaft 34), and the grinding wheel 21 is moved to the first grinding surface 22a at P19.
At a position corresponding to a predetermined rake angle A required for the rake face 5b (FIG. 7) of the tooth 5, and at P20, the first
The grinding surface 22a is moved to a position where the cutting amount becomes a predetermined cutting amount H2. Next, the process proceeds to P11, and P12 to P1
6, the same operation as described above is performed, and the rake face 5b of each tooth 5 is formed.
Grinding.

When the operation proceeds from P6 to the curved surface grinding mode of P22, the grinding of the flank 5a and the rake face 5b by P15 is performed in addition to the forward / reverse rotation of the X-axis motor 28 and the rotation motor 36. Is rotated forward and backward at a predetermined angle, and as shown in FIG. 8, the grindstone 21 is reciprocated at a predetermined angle about the rotation axis L (the rotation axis 34) to make the flank 5a and the rake face 5b into an arc shape. Grind. Also,
P21 is changed from completion of surface grinding to completion of curved surface grinding. Other operations are substantially the same as those of P7 to P21 described above.

[0019]

As is apparent from the above description, claim 1
According to the invention, the pitch of each tooth of the rotary saw is measured and stored, and the rotary saw is repeatedly rotated based on the stored data to grind the flank, rake face, etc. of each tooth. Therefore, each tooth can be ground quickly and with high precision. In the invention according to claim 2, the pitch of each tooth is measured by a driving amount of a servo motor for rotating a rotary saw and a signal of a laser sensor for detecting a tooth arriving at a grindstone portion. The need for a reference pin for positioning the teeth for each tooth is eliminated, and the structure is simplified, and the pitch of each tooth can be measured with high precision and speed even if the rake face has a large lateral rake angle. be able to. The invention according to claim 3 simplifies the structure of the tooth feed portion by omitting a reference pin for positioning a tooth for each tooth, and performs flank, rake face surface grinding and curved surface grinding with high precision. Can be done quickly.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a rotary tooth grinding device showing an embodiment of the present invention.

FIG. 2 is a front view showing a grinding state of a flank according to the present invention.

FIG. 3 is a front view showing a grinding state of a rake face according to the present invention.

FIG. 4 is a front view showing a state in which a flank is ground by a curved surface according to the present invention;

FIG. 5 is an enlarged view of a main part of FIG. 2;

FIG. 6 is an enlarged view of a main part of FIG. 3;

FIG. 7 is a side view of a tooth whose flank and rake face are ground.

FIG. 8 is an explanatory view of a principal part showing a state where a flank is ground on a curved surface;

FIG. 9 is a block diagram of a control device according to the present invention.

FIG. 10 is a flowchart illustrating an example of a grinding operation of the control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grinding device 2 Frame 3 Rotating saw 4 Substrate 5 Teeth 5a Relief surface 5b Rake surface 5c Tip cutting teeth 6 Tooth feed device 7 Tooth feed motor (servo motor) 10 Pitch measuring device 11 Laser sensor 11a Emitter 11b Light receiver 15 Rotation Table 15a Support shaft O Grinding reference point (center of rotation) 16 Rotating device 17 Guide rail 18 Rotating motor (servo motor) 18a Worm 18b Worm wheel 20 Wheel head 20a Main shaft 20b Wheel motor 21 Wheel 22 First wheel 22a First Grinding surface 23 Second grinding stone 23a Second grinding surface 24 Grinding stone attitude changing device 25 Head moving device 26 X-axis head moving device 27 X-axis moving base 28 X-axis motor (servo motor) 29 Sensor 30 Y-axis head moving device 31 Y-axis Moving base 32 Y-axis motor (servo motor) 33 rotation Rotating device 34 Revolving axis 35 Revolving table 36 Revolving motor (servo motor) 37 Bracket 40 Second head moving device 41 Second Y-axis moving base 42 Second Y-axis motor (servo motor) 50 Control device 51 Grinding mode setting unit 52 Grinding command unit 53 Tooth pitch measuring unit 54 Tooth feed unit 55 Grinding stone posture changing unit

Claims (3)

[Claims] A pitch measuring device (1) for measuring and storing a pitch of each tooth (5) of a rotating saw (3) to be rotated.
0), a tooth feeder (6) for indexing and rotating the rotary saw (3) based on the measured value, and the tooth feeder (6).
A grinding wheel (21) for grinding the tooth (5) sent to a predetermined position by the above, and a grinding wheel posture change for changing the direction of the grinding wheel (21) such that the grinding surface faces the predetermined surface of the tooth (5). Device (24), and the rotary saw (3) is repeatedly rotated by the tooth feeder (6) based on the data of the pitch measuring device (10) obtained by the first rotation of the rotary saw (3);
Each time the rotary saw (3) is rotated once, the direction of the grindstone (21) is changed by the grindstone attitude changing device (24), and the ground surface (22a, 23a) is changed to the corresponding surface (5) of the tooth (5). 5
a, 5b), a method for grinding a rotary saw. The pitch measuring device (10) includes a rotary saw (3).
And a laser sensor (11) for irradiating a laser beam toward the teeth (5) of the rotary saw (3) arriving at the grindstone (21), and the driving amount of the servomotor (7) of the tooth feeder (6) for rotating the teeth. 2. The method for grinding a rotary saw according to claim 1, wherein the pitch of each tooth of the rotary saw is measured based on the signal of (1) and stored. 3. A frame feeder (6) for indexing and rotating a rotary saw (3) is provided on a frame (2).
A rotary table (15) is provided at a predetermined tooth (5) portion of the rotary saw (3) to rotate about a grinding center (O) parallel to the rotation axis of the rotary saw (3). An X-axis moving base (2) that moves in a radial direction with respect to its
7), the X-axis moving base (27) is provided with a revolving base (35) for revolving around the moving axis thereof, and the revolving base (35) is provided with an axis perpendicular to the revolving center (L). A grinding wheel head (20) that rotates as a center is provided, and the tooth feeder (6) is provided with a laser sensor (11) that irradiates a laser beam toward a tooth (5) of a rotary saw (3) arriving at the grinding center. ), And the laser sensor (1)
A grinding machine for a rotary saw, comprising a servomotor (7) for inputting the signal of 1) and indexing and rotating the rotary saw (3).