JP7161807B1 - Grinder - Google Patents

Abstract

A grinder capable of grinding both a hob and a pinion cutter, suppressing an increase in purchase cost for a user, and suppressing expansion of installation space is provided. A grindstone driving motor (16) for rotating a spindle (36) to which a first grindstone (39) or a second grindstone is selectively attached around a first imaginary line (C1), and either a pinion cutter (17) or a hob are selectively attached. A grinding target support portion 19, a first mount portion 14 that supports the grindstone drive motor 16 at a first support position, a second mount portion 15 that supports the grindstone drive motor 16 at a second support position, a first A first servomotor 24 that reciprocates the mount portion 14 in a direction along the first virtual line C1, a second servomotor that rotates the grinding object support portion 19 around the second virtual line A1, and a grinding object support portion. A grinding machine 10 having a third servomotor for reciprocating and stopping 19 in the direction along the second imaginary line A1 was constructed. [Selection drawing] Fig. 1

Description

The present disclosure relates to grinders for grinding hob cutting tooth rake faces and pinion cutter cutting tooth rake faces.

Gear cutting machines that cut gears include hobbing machines that machine gears by rotating a hob, and shaping machines (gear shapers) that machine gears by reciprocating a pinion cutter. Of the hobbing machines, vertical hobbing machines support a cylindrical hob with a plurality of cutting teeth along the outer peripheral surface so that the center line is vertical, and the work material is cut. Gears are produced by rotating the hob with the center line horizontal and moving the hob in the radial direction of a circle centered on the center line to cut the outer peripheral surface of the workpiece. .

The cutting machine cuts the outer peripheral surface or the inner peripheral surface of the workpiece by reciprocating a cylindrical pinion cutter with cutting teeth on the tip surface in a direction along the center line. It manufactures gears. Grinding machines for grinding the cutting teeth of a hob for precision finishing are described in Patent Documents 1 and 2. Further, Patent Documents 3 and 4 describe a grinder that grinds the cutting teeth of a cylindrical pinion cutter for precision finishing.

Japanese Patent No. 6693290 Japanese Patent No. 6110930 Japanese Patent No. 4763611 Japanese Patent No. 3080824

According to the grinders described in Patent Documents 1 to 4, the inventor of the present application separately provided a grinder for grinding the cutting teeth of the pinion cutter and a grinder for grinding the cutting teeth of the bob. , the user must purchase both a grinder for grinding the pinion cutter and a grinder for grinding the hob, which increases the user's cost and expands the installation space of the grinder. did.

An object of the present disclosure is to provide a grinder capable of grinding both a hob and a pinion cutter, suppressing an increase in purchase cost for a user, and suppressing expansion of installation space.

The present disclosure rotates a spindle about a first imaginary line to which is selectively mounted a first wheel for grinding the rake face of the cutting tooth of a pinion cutter and a second wheel for grinding the rake face of the cutting tooth of a hob. A grindstone drive motor, any one of the pinion cutter ground by the first grindstone and the hob ground by the second grindstone are selectively mounted, and a second virtual plane is mounted in a first vertical plane. A grinding object support portion rotated about a line and the grinding wheel drive motor are supported at a first support position that places the second virtual line on the first virtual line within a horizontal second plane, and a first mounting portion capable of reciprocating in a direction along the first imaginary line with respect to the grinding target support portion; A second support position where a first virtual line intersects the first virtual line when the grindstone drive motor is supported by the first mount and is a position off the second virtual line and a second mount portion that holds the supported grindstone drive motor at a predetermined position in the direction along the first imaginary line of the spindle corresponding to the second support position; The first mount portion that supports the grindstone drive motor to which the grindstone is attached at the first position is positioned along the first imaginary line of the spindle corresponding to the first support position within the second plane. a first servomotor for reciprocating in the direction of the first servomotor; a second servomotor for rotating the object-to-be-grounded support portion about the second imaginary line; It has a first state in which it reciprocates in the direction along the virtual line, and a second state in which the grinding object support portion to which the pinion cutter is attached is held at a predetermined position in the direction along the second virtual line. and a third servomotor.

According to the present disclosure, in addition to being able to grind both the hob and the pinion cutter, it is possible to suppress an increase in the cost for the user to purchase the grinding machine, and to suppress the expansion of the installation space of the grinding machine.

FIG. 4 is a plan view of the grinder of the present disclosure, showing an example of grinding a pinion cutter with a grindstone. It is a grinder and is a front view which shows the example which grinds a pinion cutter with a whetstone. It is a top view which shows the example which grinds a hob with the whetstone of a grinder. It is a front view which shows the example which grinds a hob with the whetstone of a grinder. It is a front view which shows a 2nd drive mechanism and a 3rd drive mechanism. It is a bottom view which shows a 2nd drive mechanism. (A) is a cross-sectional view of a pinion cutter, and (B) is a front view of a hob. . (A) is a partially enlarged view of FIG. 2, and (B) is a partially enlarged view of FIG.

Hereinafter, embodiments of the grinder of the present disclosure will be described in detail based on the drawings. In principle, the same parts are denoted by the same reference numerals in all the drawings for explaining the grinding machine, and the repeated description thereof will be omitted.

[Outline of grinding machine]
As shown in FIGS. 1, 2, 3, 4, 5, and 6, the grinder 10 includes a bed 11, a motor die 12 movably provided with respect to the bed 11, and the motor die 12 on the bed 11. A first drive mechanism 13 that moves relative to the motor die 12, a first mount portion 14 and a second mount portion 15 provided on the motor die 12, and can be selectively attached and detached to the first mount portion 14 and the second mount portion 15. and a grindstone drive motor 16 .

In addition, the grinding machine 10 includes a grinding target support portion 19 that supports the pinion cutter 17 and the hob 18 that are grinding targets, a second drive mechanism 20 that rotates the grinding target support portion 19 around a second virtual line A1, and a third drive mechanism 21 for reciprocating the grinding object support portion 19 in a direction along the second imaginary line A1. 1 and 3 show a second plane in which the grinding machine 10 is viewed in plan. 2 and 4 represent a vertical first plane of the grinder 10 viewed from the front.

The bed 11 is installed on the floor in the factory. The bed 11 supports the motor die 12 , the first mount section 14 and the second mount section 15 . As shown in FIG. 1, a plurality of guide rails 22 are provided parallel to each other and horizontally on the upper surface of the bed 11 . The motor die 12 supports the first mount portion 14 and the second mount portion 15 . The motor die 12 is a plate-shaped member provided on a guide rail 22 , and a plurality of sliders 23 are fixed to the lower surface of the motor die 12 . As shown in FIG. 2, the slider 23 is placed on the guide rail 22, and the slider 23 can horizontally reciprocate along the guide rail 22. As shown in FIG. Therefore, the motor die 12 can reciprocate horizontally on the bed 11, that is, horizontally in FIG.

The first drive mechanism 13 is a mechanism for horizontally moving the motor die 12 with respect to the bed 11 . The first drive mechanism 13 has a first servomotor 24 , a drive shaft 25 connected to the rotating shaft of the first servomotor 24 , and a nut 26 attached to the lower surface of the motor die 12 . The first servomotor 24 can rotate the rotating shaft in the first direction and the second direction, and finely adjust the rotation angle of the rotating shaft within a range of less than 360 degrees. A male screw is provided on the outer peripheral surface of the drive shaft 25, and the drive shaft 25 and the nut 26 are connected by a screw mechanism.

Therefore, when the rotary shaft of the first servomotor 24 is rotated, the motor die 12 is horizontally moved on the bed 11 . Further, when the rotating direction of the rotating shaft of the first servomotor 24 is switched between the first direction and the second direction, the motor die 12 is reciprocated on the bed 11 . Thus, when the first servomotor 24 is driven, the motor die 12 and the first mount portion 14 are reciprocated in the direction along the first imaginary line C1 within the plane shown in FIG.

The first mount portion 14 supports the grindstone drive motor 16 at the first support position shown in FIG. When the grindstone drive motor 16 is supported at the first position, the second virtual line A1 is arranged on the first virtual line C1. Further, the first mount portion 14 can reciprocate in the direction along the first imaginary line C1 while supporting the grindstone drive motor 16 . The first mount portion 14 has a lower base 27 fixed to the motor die 12 and a clamp 28 provided on the lower base 27 . Clamp 28 has support holes 30 . A center line B<b>1 of the support hole 30 is horizontal and arranged along the longitudinal direction of the guide rail 22 . When the grinder 10 is viewed from above as shown in FIG. 1 , the first mount portion 14 is arranged from inside the arrangement area of the motor die 12 to outside the arrangement area of the motor die 12 . The support holes 30 are located outside the area where the motor die 12 is arranged.

The second mount portion 15 is a mechanism that supports the grindstone drive motor 16 at the second support position shown in FIG. The first imaginary line C1 (C1B) when the grindstone drive motor 16 is supported at the second support position is the first imaginary line C1 (C1A) when the grindstone drive motor 16 is supported at the first support position. , and the first imaginary line C1 is arranged at a position deviated from the second imaginary line A1. FIG. 3 shows an example in which the predetermined angle is 90 degrees. Further, the grindstone drive motor 16 supported at the second support position by the second mount portion 15 is held at a predetermined position in the direction along the first imaginary line C1, that is, stopped.

As shown in FIG. 4 , the second mount portion 15 has a slide guide 31 fixed to the motor die 12 , a clamp 32 attached to the slide guide 31 , and a support hole 34 provided in the clamp 32 . The center line B2 of the support hole 34 shown in FIG. 3 is horizontal, and when the grinder 10 is viewed from above, the center line B1 and the center line B2 are arranged to intersect at a predetermined angle, for example, intersect at 90 degrees. It is When the grinder 10 is viewed from above, the second mount portion 15 is arranged within the arrangement area of the motor die 12 . Furthermore, the clamp 32 can move relative to the slide guide 31 in the direction along the center line B2. A position adjusting mechanism 70 is provided on the slide guide 31 . The position adjustment mechanism 70 has a screw mechanism 71 and a dial 72 , and when the operator operates the dial 72 , the clamp 32 is moved along the slide guide 31 .

The grindstone drive motor 16 is an electric motor and has a spindle 36 . The grindstone drive motor 16 is connected to a control unit, for example an amplifier, via wiring 37 as shown in FIGS. The operator can control the rotation, stop, rotation direction, and rotation speed of the grindstone drive motor 16 by operating the amplifier. A nut 38 is attached to the spindle 36, and by tightening or loosening the nut 38, two types of first grindstone 39 and second grindstone 40 can be selectively attached and detached. The grindstone drive motor 16 rotates the spindle 36 around the first imaginary line C1.

The grindstone drive motor 16 has a cylindrical cylinder. By inserting the cylinder into either one of the two support holes 30 or 34, the operator can change the mounting location of the grinding wheel drive motor 16 between the first mount portion 14 and the second mount portion 15. can. As shown in FIG. 1, when the grindstone drive motor 16 is inserted into the support hole 30 and fixed to the clamp 28, the first imaginary line C1 (C1A) indicating the rotation center of the spindle 36 is drawn as shown in FIG. is horizontal to Also, the center line B1 of the support hole 30 and the first imaginary line C1 of the spindle 36 are coaxial, that is, located on the same line. On the other hand, as shown in FIG. 3, when the grindstone drive motor 16 is inserted into the support hole 34 of the clamp 32 and fixed, the first imaginary line C1 (C1B) of the spindle 36 is arranged horizontally. Also, the center line B2 of the support hole 34 and the first imaginary line C1 of the spindle 36 are coaxial, that is, located on the same line.

Either the pinion cutter 17 or the hob 18 is selectively attached to the grinding target support portion 19 . The grinding target support portion 19 includes a housing 41, a main shaft 42 supported by the housing 41 so as to be rotatable around the second imaginary line A1, and two types of mounting arbors 43 and 44 that can be attached to and removed from the main shaft 42. , have A second virtual line A1 is a virtual line indicating the center of rotation of the main shaft 42 . When the grinder 10 is viewed from the front as shown in FIG. 2, the second imaginary line A1 is inclined at a predetermined angle α1 with respect to the vertical line G1. The predetermined angle α1 is in the range of 4.9 degrees to 5.1 degrees, specifically 5.0 degrees. The meaning of setting the predetermined angle α1 will be described later.

The mounting arbors 43 , 44 are separate members, and the mounting arbors 43 , 44 are separately mounted and removed from the main shaft 42 . The pinion cutter 17 can be attached to and removed from the attachment arbor 43 shown in FIG. A mounting arbor 44, shown in FIG. 4, allows the hob 18 to be mounted and removed.

The second drive mechanism 20 rotates the grinding target support portion 19 around the second imaginary line A1. The second drive mechanism 20 shown in FIGS. 5 and 6 includes a second servomotor 46 having a rotating shaft 45, a worm 48 which is a shaft member connected to the rotating shaft 45 via a coupling 47, and a and a worm gear 49 to be meshed with. The second servomotor 46 can rotate the rotating shaft 45 in the first direction and the second direction around the center line D2, and finely adjust the rotation angle of the rotating shaft 45 within a range of less than 360 degrees. A center line D2 is an imaginary line passing through the center of the rotation shaft 45 . The worm gear 49 is rotatable around the second virtual line A1. A transmission shaft 53 is provided to connect the worm gear 49 and the main shaft 42 so as to transmit power. The transmission shaft 53 is rotatable around the second imaginary line A1. The second servomotor 46 can rotate and stop the grinding target support portion 19 around the second virtual line A1.

The third drive mechanism 21 shown in FIG. 5 reciprocates and stops the grinding target support portion 19 and the second drive mechanism 20 in the direction along the second imaginary line A1. The third drive mechanism 21 has a third servomotor 51 having a rotating shaft 50 and a drive shaft 52 connected to the rotating shaft 50 of the third servomotor 51 . The third servo motor 51 can rotate the rotating shaft 50 in the first direction and the second direction, and finely adjust the rotation angle of the rotating shaft 50 within a range of less than 360 degrees. The rotating shaft 50 and the driving shaft 52 are coaxially arranged so as to be rotatable around the third imaginary line D1. The third virtual line D1 and the second virtual line A1 are parallel.

A male thread is provided on the outer peripheral surface of the drive shaft 52 . A unit base 29 that supports the second drive mechanism 20 and the main shaft 42 is provided, and a nut 54 is provided on the unit base 29 . A nut 54 and the drive shaft 52 are connected by a ball screw. Therefore, when the drive shaft 52 is rotated, the unit base 29 is actuated along the third imaginary line D1, and the main shaft 42 and mounting arbor 44 are actuated along the second imaginary line A1. be. The control state of the third servomotor 51 includes a first state in which the grinding object support portion 19 shown in FIGS. and a second state in which it is held in place in a direction along line A1. When the grinding object support portion 19 is held at a predetermined position, for example, the standby position, the upper end of the hob 18 is positioned below the first imaginary line C1. A control panel for controlling the first servomotor 24, the second servomotor 46, and the third servomotor 51 is provided. , and the third servomotor 51 can be controlled separately.

[Configuration example of pinion cutter and hob]
A configuration example of the pinion cutter 17 and the hob 18 that are ground by the grinder 10 will be described. As shown in FIG. 7A, the pinion cutter 17 has a large number of cutting teeth 55 provided at regular intervals along the circumferential direction on the outer peripheral surface of an annular body centered on the center line E1. The pinion cutter 17 is attached to the rotating shaft of the gear cutting machine, and by moving the pinion cutter 17 in the direction along the center line E1, the pinion cutter 17 can cut the workpiece to manufacture a gear.

The pinion cutter 17 has an acute rake angle α2 between the rake face 56 provided at the tip of the cutting tooth 55 and a straight line E2 perpendicular to the center line E1. The rake angle α2 is set within the range of 4.9 degrees to 5.1 degrees, specifically at 5.0 degrees. This 5.0 degrees is a value defined by Japanese Industrial Standards (JIS). The meaning of the range of 4.9 degrees to 5.1 degrees is that processing errors and dimensional errors of the pinion cutter 17 are considered. Then, as shown in FIG. 8A, the predetermined angle α1 and the rake angle α2 are set to be the same. The rake face 56 of the cutting tooth 55 of the pinion cutter 17 is worn and deformed by use. can be maintained.

As shown in FIG. 7B, the hob 18 has a large number of cutting teeth 74 provided at regular intervals along the circumferential direction on the outer peripheral surface of an annular body centered on the center line F1. The hob 18 is attached to the rotary shaft of the gear cutting machine, and by rotating the hob 18 and moving the hob 18 radially around the center line F1, the workpiece can be cut to manufacture a gear. . Since the rake face 57 of the cutting tooth 74 of the hob 18 is worn and deformed by use, the shape accuracy of the cutting tooth 74 is maintained by removing the hob 18 from the gear cutting machine and grinding the rake face 57 with the grinder 10. be able to. Materials of the pinion cutter 17 and the hob 18 are general steel, tool steel, aluminum, copper, cemented carbide, and the like, respectively. The first whetstone 39 and the second whetstone 40 are both annular or disk-shaped, and may be diamond whetstones, vitrified whetstones, resinoid whetstones, or the like. The abrasive grains of the first grindstone 39 and the second grindstone 40 are determined according to the materials of the pinion cutter 17 and the hob 18 .

[Example of grinding a pinion cutter]
An example of grinding the pinion cutter 17 with the grinder 10 will be described. As shown in FIGS. 1 and 2, the operator inserts the grindstone drive motor 16 into the support hole 30 of the clamp 28 and fixes it. A disk-shaped first whetstone 39 is attached to the tip of the spindle 36, and a nut 38 is tightened. Note that the grindstone drive motor 16 is not attached to the second mount portion 15 . Further, a mounting arbor 43 is mounted on the main shaft 42 as shown in FIG. Then, the operator attaches the pinion cutter 17 to the tip of the mounting arbor 43 and tightens the nut 58 as shown in FIG. That is, the plurality of cutting teeth 55 of the pinion cutter 17 are arranged at regular intervals on the same circumference around the second imaginary line A1.

When the operator operates the control panel to rotate the second servomotor 46 in a certain direction, the rotational force of the rotating shaft 45 is transmitted to the main shaft 42 via the worm 48, the worm gear 49, and the transmission shaft 53. be. Therefore, the main shaft 42 shown in FIG. 1 is continuously rotated clockwise at a low speed, and the pinion cutter 17 is rotated clockwise. In this way, the plurality of cutting teeth 55 of the pinion cutter 17 revolve around the center line E1. As shown in FIG. 8A, since the predetermined angle α1 is set between the second virtual line A1 and the vertical line G1, the rake face of each cutting tooth 55 is rotated while the pinion cutter 17 rotates once. 56 is displaced in height in the direction along the vertical line G1.

Since the predetermined angle α1 and the rake angle α2 are the same, the rake face 56 of the cutting tooth 55 passing through the lowest position in the direction along the vertical line G1 is horizontal. Here, as shown in FIG. 8A, the rake face 56 of the cutting tooth 55 is ground by the outer peripheral face 75 of the first grindstone 39 . Then, in the direction along the vertical line G1, the height of the rake face 56 of the cutting tooth 55 passing through the lowest position, and the lowest point in the direction along the vertical line G1 among the outer peripheral surface 75 of the first grindstone 39 , the grinding depth of the rake face 56 is determined. The height of the rake face 56 of the cutting tooth 55 passing through the lowest position in the direction along the vertical line G1 can be adjusted by controlling the rotation angle and stop position of the third servomotor 51 .

On the other hand, as shown in FIG. 1, when the grinder 10 is viewed from above, the first imaginary line C1 of the spindle 36 and the second imaginary line A1 of the mounting arbor 43 intersect. The operator operates the amplifier to drive the first servomotor 24, and the rotation direction of the drive shaft 25 is alternately switched between the first direction and the second direction. Therefore, the motor die 12 reciprocates along the guide rails 22 on the bed 11 in the horizontal direction in FIGS. The range in which the motor die 12 reciprocates along the guide rail 22 is determined according to the angle of rotation of the drive shaft 25 in the first direction and the angle of rotation in the second direction.

As described above, when the motor die 12 reciprocates along the guide rail 22, the grindstone drive motor 16 reciprocates in the direction along the first imaginary line C1. That is, as shown in FIG. 1 , a part of the first grindstone 39 alternately repeats the action of entering the arrangement range of the pinion cutter 17 and retreating out of the arrangement range of the pinion cutter 17 . Therefore, the lowest point in the direction along the vertical line G1 on the outer peripheral surface of the first grindstone 39 shown in FIG. 56 and the rake face 56 is ground by the first grindstone 39 . Since the pinion cutter 17 is rotated around the second imaginary line A1, the rake faces 56 of all the cutting teeth 55 are ground by the first grindstone 39 .

[Example of grinding a hob]
An example of grinding the hob 18 with the grinder 10 will be described. The operator inserts the grindstone drive motor 16 into the support hole 34 of the clamp 32 and fixes the grindstone drive motor 16 to the clamp 32 as shown in FIG. A second whetstone 40 is attached to the tip of the spindle 36 and a nut 38 is tightened. Further, the operator operates the dial 72 to move the clamp 32 with respect to the slide guide 31 in the direction along the first imaginary line C1. Then, as shown in FIG. 8B, the clamp 32 is stopped with respect to the slide guide 31 at the position where the extension line H1 of the tip surface 73 of the second whetstone 40 intersects with the second imaginary line A1. That is, the grindstone drive motor 16 supporting the second grindstone 40 is stopped at a predetermined position in the direction along the first imaginary line C1. Note that the grindstone drive motor 16 is not attached to the first mount portion 14 .

Further, the operator attaches the attachment arbor 44 to the main shaft 42 as shown in FIG. The hob 18 is then attached to the tip of the mounting arbor 44 and the nut 58 is tightened. Therefore, as shown in FIG. 8(B), the plurality of cutting teeth 74 of the hob 18 are arranged at equal intervals on the same circumference around the second imaginary line A1.

As shown in FIG. 4, when the second grindstone 40 is attached to the spindle 36 and the hob 18 is attached to the attachment arbor 44, the hob 18 is separated from the outer peripheral surface of the second grindstone 40 and the hob 18 is at the standby position below the first virtual line C1. Further, the grindstone drive motor 16 is stopped at a predetermined position in the direction along the first imaginary line C1. For this reason, when the grinder 10 is viewed from above, as shown in FIG. 2 servo motor 46 is stopped. Further, the third servomotor 51 is stopped while the upper end of the hob 18 is at the standby position below the first imaginary line C1.

When the operator operates the amplifier to rotate the spindle 36 of the grindstone drive motor 16, the second grindstone 40 is rotated clockwise in FIG. When the operator operates the control panel to rotate the third servomotor 51 in the first direction, the main shaft 42 and the mounting arbor 44 move in the direction along the second imaginary line A1 as shown in FIG. It is raised and the third servomotor 51 is temporarily stopped. Next, the third servomotor 51 is rotated in the second direction, and the main shaft 42 and the mounting arbor 44 are lowered in the direction along the second imaginary line A1. Then, when the hob 18 reaches the standby position, the third servomotor 51 is stopped. In this way, the hob 18 is raised in the direction along the second imaginary line A1 and stopped, and the hob 18 is lowered in the direction along the second imaginary line A1. , the rake face 57 of the cutting tooth 74 closest to the second grindstone 40 is ground by the tip end face 73 of the second grindstone 40 .

Further, when the descending hob 18 reaches the standby position and the third servomotor 51 is stopped, the second servomotor 46 is rotated by a predetermined angle in a predetermined direction and then stopped. Therefore, the main shaft 42 and the mounting arbor 44 are rotated in a predetermined direction by a predetermined angle, and in FIG. 8B, the hob 18 is rotated clockwise by a predetermined angle θ1 and stopped. The predetermined angle θ1 is a value at which the rake face 57 of the cutting tooth 74 positioned one piece downstream from the ground cutting tooth 74 in the rotational direction of the hob 18 reaches the extension line H1. That is, the predetermined angle by which the second servomotor 46 rotates in the predetermined direction is a value corresponding to the predetermined angle θ1.

Thereafter, the third servomotor 51 is rotated in a first direction and stopped, and the third servomotor 51 is rotated in a second direction and stopped, and the second servomotor 46 is rotated in a predetermined direction by a predetermined angle. The operation of starting and stopping is repeated alternately. Thus, the rake faces 57 of all the cutting teeth 74 provided on the outer peripheral surface of the hob 18 can be ground by the second grindstone 40 . In addition, when grinding the hob 18 with the second grindstone 40, the position of the tip surface 73 of the second grindstone 40 in the direction along the first virtual line C1 is adjusted, and the grinding depth of the cutting teeth 74 with respect to the rake surface 57 is adjusted. Adjustable. Furthermore, when grinding the hob 18 with the second grindstone 40, the first servomotor 24 in FIG. 1 is stopped. That is, the motor die 12 is stopped without moving in the horizontal direction in FIG.

[effect]
According to the grinder 10 of the present disclosure, the operator selectively attaches either the pinion cutter 17 or the hob 18 to the grinding target support portion 19, and attaches the grindstone drive motor 16 to the first mount portion 14 or the second mount portion 14. Either the first grindstone 39 or the second grindstone 40 can be selectively attached to the mount portion 15 and attached to the spindle 36 . Therefore, the pinion cutter 17 and the hob 18 can be separately ground by one grinding machine 10 . Therefore, it is possible to suppress an increase in the cost for the user to purchase the grinder 10 and to suppress an increase in the installation space of the grinder 10 .

[supplementary explanation]
An example of the technical meaning of the items described in this embodiment is as follows. Grinding machine 10 is an example of a grinding machine. The pinion cutter 17 is an example of a pinion cutter. Cutting teeth 55 are an example of cutting teeth of a pinion cutter. Rake face 56 is an example of a cutting tooth rake face of a pinion cutter. The first whetstone 39 is an example of a first whetstone. Hob 18 is an example of a hob. Cutting teeth 74 are an example of hob cutting teeth. Rake face 57 is an example of a hob cutting tooth rake face. The second whetstone 40 is an example of a second whetstone. Spindle 36 is an example of a spindle. The first virtual lines C1, C1A, and C1B are examples of first virtual lines. The grindstone drive motor 16 is an example of a grindstone drive motor. The second virtual line A1 is an example of a second virtual line. The grinding target support portion 19 is an example of a grinding target support portion.

The first mount portion 14 is an example of a first mount portion. The second mount portion 15 is an example of a second mount portion. The first servomotor 24 is an example of a first servomotor. The second servomotor 46 is an example of a second servomotor. The third servomotor 51 is an example of a third servomotor. The plumb line G1 is an example of a plumb line. 2 and 4, which are front views of the grinding machine 10, are examples of the first plane along the vertical line . 1, 3, and 8B, which are plan views of the grinding machine 10, are examples of the second plane perpendicular to the vertical line. In this disclosure, horizontal includes substantially horizontal as well as perfectly horizontal. In this disclosure, vertical includes nearly vertical as well as perfectly vertical. That is, the horizontal and vertical include the range of machining error, dimensional error, and assembly error of parts, respectively.

The grinder of this embodiment is not limited to what is disclosed with reference to the drawings, and can be modified in various ways without departing from the scope of the invention. For example, in the present embodiment, the outer diameter of the pinion cutter to be ground and the number of cutting teeth do not matter. The outer diameter of the hob and the number of cutting teeth are irrelevant.

This embodiment can be used as a grinder capable of grinding both hobs and pinion cutters.

DESCRIPTION OF SYMBOLS 10... Grinding machine 14... 1st mount part 15... 2nd mount part 16... Grindstone drive motor 17... Pinion cutter 18... Hob 19... Grinding object support part 24... First servo motor 39... First grindstone 36 Spindle 40 Second grindstone 46 Second servo motor 51 Third servo motor 55, 74 Cutting tooth 56, 57 Rake face A1 Second virtual line C1 , C1A, C1B... first virtual line, G1... plumb line

Claims (4)

a grindstone driving motor for rotating a spindle about a first imaginary line to which a first grindstone for grinding the rake face of the cutting tooth of the pinion cutter and a second grindstone for grinding the rake face of the cutting tooth of the hob are selectively attached; ,
Either the pinion cutter ground by the first grindstone or the hob ground by the second grindstone is selectively attached, and the second virtual line is set in the first plane along the vertical line. a grinding object support rotated about a center;
The grindstone drive motor is supported at a first support position where the first virtual line and the second virtual line intersect within a second plane perpendicular to the vertical line , and the object to be ground is supported. a first mount portion capable of reciprocating in a direction along the first virtual line with respect to the portion;
The grindstone drive motor, in which the second grindstone is attached to the spindle, is aligned with the first virtual line in the second plane when the grindstone drive motor is supported by the first mount. and supported at a second support position that intersects with the second phantom line and is located outside the second phantom line, and supports the grindstone drive motor of the spindle corresponding to the second support position. a second mount held at a predetermined position in the direction along the first imaginary line;
The first mounting portion, which supports the grinding wheel drive motor to which the first grinding wheel is mounted, at the first supporting position, is positioned within the second plane at the first mounting portion of the spindle corresponding to the first supporting position. a first servo motor that reciprocates in a direction along the virtual line;
a second servomotor that rotates the grinding target support portion around the second virtual line;
A first state in which the object-to-be-grounded support portion to which the hob is attached is reciprocated in a direction along the second virtual line; a third servomotor having a second state for holding at a predetermined position in a direction along the
A grinding machine. The grinding machine of claim 1, wherein
The grinder, wherein within the first plane, the second imaginary line is inclined 5.0 degrees with respect to the vertical line. The grinder according to claim 1 or 2,
The grinder, wherein when the pinion cutter is attached to the grinding target support portion, a plurality of cutting teeth of the pinion cutter are arranged at equal intervals on the same circumference around the second imaginary line. The grinder according to claim 1 or 2,
The grinder, wherein when the hob is attached to the grinding target support portion, a plurality of cutting teeth of the hob are arranged at equal intervals on the same circumference around the second imaginary line.

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