JPS59192455A - Neumerical controlled tool grinding machine - Google Patents

Abstract

PURPOSE:To mount a grindstone wheel accurately by providing a grindstone wheel lifter for fitting the grindstone wheel into a female tapered hole on grindstone shaft with constant face pressure and a distance setting means for setting predetermined interval between the referential faces of spindle head and grindstone wheel. CONSTITUTION:A contact detector 80 which is a component of a distance setting means is fixed at the lower end of a case 12a for a grinding spindle head 12 where a grindstone shaft 16 formed with a male tapered shaft 16a for mounting a grindstone is formed at the lower end. Said contact detector 80 is provided such that the distance between the referential faces 86 and 90 of the end face of the casing 12a and the end face of a grindstone sleeve 88 of a grindstone wheel 14 is set to predetermined level through displacement in F-axis direction of the grindstone shaft 16. While an arm 72 extending laterally is fixed at the lower end of a rotary shaft 58 of an automatic grindstone replacer 50 where a grindstone lifter 40 containing a motor MP is provided at the outer end of said arm 72 to fit the female tapered hole of the grindstone wheel 14 tightly over the male tapered shaft 16a of the grindstone shaft 16.

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a numerically controlled tool grinder that performs tool grinding according to control commands from a numerical control device, and in particular, a plurality of grinding wheels stored in a grinding wheel magazine are sequentially moved to the tip of the grinding wheel shaft of the spindle head. This invention relates to a numerically controlled tool grinding machine with an automatic grindstone exchange device that automatically performs tool grinding by replacing and attaching a male grinding wheel formed in the shaft.

Prior art tool grinding machines, especially numerically controlled tool grinding machines (hereinafter referred to as
NC tool grinders) are widely used. When grinding tools with this NC tool grinder, the grinding wheel is often shaped into a complicated shape, for example, into a boat-shaped cutter, due to the complexity of grinding the tool cutting edge. With the advent of granular grindstones, it has become difficult to shape (truing) the grindstone directly on the grinding machine, and moreover, the tool grinding operation is interrupted during shaping, which reduces the work efficiency of the NC tool grinder. There are inconveniences such as being a contributing factor. In order to eliminate this inconvenience, it has already been done to provide a separate grinding wheel truing device and use this truing device to shape the grinding wheels in advance. Application of this technology to realize an automatic grinding wheel exchange device has not yet been implemented. Therefore, the present inventor has realized and embodied an NC tool grinder with an automatic grinding wheel exchange device, but when grinding a tool, when automatically changing the grinding wheel, the mounting accuracy of the grinding wheel on the grinding wheel shaft is We found that reproducibility was a major problem. In other words, unless the reproducibility of the axial positioning accuracy and the reproducibility of the centering accuracy of the grinding wheel on the grinding wheel axis are ensured, it is impossible to improve the accuracy of tool grinding, which ultimately affects the machining accuracy of the workpiece. This also results in limitations. In this case, as for the accuracy of tool grinding, in recent years, a depth of cut of several microns at most is sometimes set during finish grinding, and therefore it is extremely important to ensure the positioning accuracy of the grinding wheel on the grinding wheel axis.

According to the object of the invention, an object of the present invention is to provide an automatic grinding wheel that can ensure reproducibility of positioning accuracy and high centering accuracy even when grinding wheels are sequentially replaced and installed on the grinding wheel shaft of an NC tool grinder. The present invention aims to provide an NC tool grinder with an exchanger.

Structure and operation of the invention In view of the above-mentioned objects, according to the present invention, d number of grinding wheels stored in a grinding wheel magazine are sequentially replaced with a male tip of 9 grinding wheel shafts held in the main spindle head, In a numerically controlled tool grinder equipped with an automatic grinding wheel changer that performs tool grinding by mounting, each of the grinding wheels is provided with nine female holes that are complementary to the male teeth and nine holes at the tip of the grinding wheel shaft. , and a grinding wheel pushing means for closely fitting the nine male teeth and the female teeth holes of each grinding wheel with a constant surface pressure, and a reference formed on the main spindle head by the axial movement of the grinding wheel shaft. There is provided a numerically controlled tool grinding machine with an automatic grinding wheel exchange device, characterized in that it is equipped with a distance setting means for setting the surface and a reference surface provided on each of the grinding wheels at a constant interval. . By means of the grinding wheel pushing means and distance setting means, each grinding wheel is always mounted at a fixed position on the grinding wheel shaft without center runout or eccentricity. Note that a pressurized oil supply means is usually provided for supplying pressurized lubricating oil to the bearing portion of the grindstone shaft, so that the axial movement (axial movement) of the grindstone shaft can be achieved smoothly and easily. In the above and following explanations, the present invention has been explained as relating to an NC tool grinder, but it is expected that the same operation and effect will be obtained even if the same technical idea is applied to an NC grinder for normal workpiece machining. Is possible.

EXAMPLES Hereinafter, the present invention will be explained in detail based on examples shown in the accompanying drawings.

FIG. 1 is a partial perspective view showing the main parts of an embodiment of an NC tool grinder with an automatic grindstone changer according to the present invention.

In FIG. 1, the NC tool grinding machine includes a grindstone head 10, an automatic grindstone exchange device 50, and a work table 100 on a bed 8. The grinding wheel head 10 has a grinding spindle head 12, and the grinding spindle head 12 is equipped with a grinding wheel spindle on which a grinding wheel 14 is replaced and mounted, so that it can rotate at high and low speeds and can slide in the axial direction (F'''). The grinding spindle head 12 is configured to be able to move back and forth in a direction perpendicular to the grinding wheel axis by a ram device 18, and a drive (not shown) is provided in place of an axis m (D axis) parallel to the forward and backward movement axis (Y axis). Furthermore, the grinding spindle head 12 is configured to be rotatable about a vertical axis (C axis) with respect to a swivel table 20 together with a ram device 18. The grinding spindle head 12 is ultimately movable in the upward and downward (two-axis) directions.The various axes of movement of the grinding spindle head 12 described above are Conventional N
This is a configuration that is included in C grinding machines and NC tool grinding machines.
In the following description, parts that are not directly related to the present invention may be understood to be equivalent to these parts.

On the other hand, the automatic grinding wheel exchange device 50 has a grinding wheel storage magazine 52.
The magazine 52 has a vertical axis (E axis) -! with respect to the magazine pace 54. It is formed to be able to turn in both left and right directions and to be movable in the upper and lower axis (s-axis) directions. The magazine 52 has a plurality of grinding wheel holders 56, which will be described later, arranged at approximately equal intervals on the circumference. Also,
The magazine pace 54 is on the guide rail 57.5 on the R drive 8.
7, it is formed so that it can be moved toward or away from the grindstone head 10, and in FIG.
Illustrated as the t T w axis. In addition, the work table 10
0 has a configuration similar to that in a conventional NC tool grinding machine, and therefore, as shown, for ped 8, ° “X”
It has axes of motion such as a ``L'' axis, a ``P'' axis, and a ``P'' axis. Note that the work head (not shown) on the work stand 100 further has a movement axis such as a work rotation axis.

FIG. 2 is a sectional view showing the detailed structure of the grinding spindle head 12 and automatic grindstone exchange device 50 in the NC tool grinder shown in FIG. In the grinding spindle head 12 shown in the same figure, the grinding wheel spindle 16 is supported by a sliding sill bearing 22 and a thrust bearing 24, the former sliding sill bearing 22 being held in the spindle head case 12a, and the latter thrust bearing 24 being It is assembled into a bearing box 26 held within the case 12a, and a predetermined preload is applied in advance by a tightening nut 28 and a series load spring 30. The grinding wheel shaft 16 is provided with a male jaw/nine shaft 16a for mounting the grinding wheel at its lower end, and a male thread 16b, which will be described later, is further formed at the lower end of the male tooth/nine shaft 16m. A pulley 32a having a sedge line groove 32b is provided at the upper end of the grindstone shaft 16, and is rotated at high and low speeds by a rotational driving force transmitted from a drive motor (not shown) via a belt 34. The grindstone shaft 16 has a goal screw nut 38 formed on an arm 36 fixedly attached to the bearing box 26 of the thrust bearing 24, which is screwed into the goal screw 40, and the sol screw 40 is connected to a transmission mechanism consisting of a gear mechanism or a belt pulley mechanism. By driving a drive motor MH consisting of a servo motor via 42, the grinding wheel is moved in the axial direction of the grindstone shaft, that is, in the direction of the F axis (FIG. 1). In addition,
This displacement in the axial direction of the grindstone shaft 160F is caused by the displacement of the ball screw nut 38 via the thrust bearing 24.
This is caused by being transmitted to the object, and a relatively small displacement width is sufficient for the moving displacement amount. In addition, the grindstone shaft 16
The radial bearing 22 and thrust bearing 24 are configured to be supplied with pressurized lubricating oil through oil supply ports 44 and 46 formed in the spindle head case 11&, and the pressurized lubricant is supplied to the spindle head case 12a. The oil is discharged from the formed return port 48. A contact detector 80 is attached to the lower end of the spindle head case 12a as a component of distance setting means, which will be described later.
2 and a switch-type gap sensor 84 attached to the tip of the arm 82.

This contact detector 80 forms a means for always maintaining a constant distance between the grinding wheel spindle head 12 and the grinding wheel 14 mounted on the male tenor 4 shaft 16a of the grinding wheel shaft 16, and for setting the distance. For example, the reference surface 86 formed on the end face of the spindle head case 12a and the grinding wheel sleeve 8 of each grinding wheel 14 are elements.
8 is set to a constant value by displacement of the grindstone shaft 16 in the F-axis direction.

When the pick and gap sensor 84 comes into contact with the reference surface of each grinding wheel 140 and detects this, the displacement in the axial direction of the grinding wheel shaft 160F is stopped, and the above-mentioned distance setting is thereby performed.

Note that the oil supply port 44 of the spindle head case 12a mentioned above.
46 is a well-known oil temperature automatic regulator 122 from the pump 120.
, oil feed 'tx2s via the switching valve 124 and the throttle 126,
At t3o, a configuration is adopted in which pressurized oil is fed through a well-known fluid resistor 134, and oil is supplied from either the oil feed pipe 128 or 130 according to the switching of the switching valve 124.

135 is a thermistor for oil temperature detection, oil temperature automatic regulator 1
The detected oil temperature is fed back to 22 via the signal line 132 to control the automatic oil temperature regulator 122. 136 is the return oil "r-) 4 g from the oil tank 138.
This is the return oil pipe that leads to the

On the other hand, the grinding wheel magazine 52 of the automatic grinding wheel changing device 50 is attached to the upper end of the rotating shaft 58 and formed as an elliptical plate member, and a plurality of grinding wheel boulders 56 are attached to the outer periphery thereof. The grinding wheel holder 56 is formed of an arc-shaped fork member having a grinding wheel receiving hole 56a in the center thereof, and is fixedly held on the outer peripheral edge of the magazine 52 by fixing means such as screws. Now, the rotating shaft 58 is held in the magazine space 54 so as to be rotatable and movable in the axial direction.The rotational movement is driven by the motor MW, and the axial movement is driven by the cylinder 6o. It is the source. Now, the rotational driving force of the motor Mw is transmitted via a gear wheel 66 to a rotating sleeve shaft 64 attached to the magazine pace 54 via bearings 62, 62.
The power is transmitted to the rotating shaft 58 through a key 58a of the rotating shaft 58 that is slidably engaged with a linear groove 64a formed on the inner peripheral surface of the rotary shaft 58. In this case, the motor Mw is formed by a servo motor, and can rotate the rotating shaft 58 over a desired rotation angle according to commands from the NC device. Note that the rotating sleeve shaft 64 and the gear wheel 66 transmit rotational force by slidingly engaging a key 64b of the rotating sleeve shaft 64 with a key groove 66a formed on the inner circumferential surface of the gear wheel 66. is configured so that it is carried out. Further, the axial displacement of the rotary shaft 58 is activated by the cylinder 60 as described above, and therefore the upper end of the piston rod 68 of the cylinder 6o is connected to the lower end of the rotary shaft 58. An arm 72 that extends laterally is also attached to the lower end of the rotating shaft 58 via a rotating bearing 70, and this arm 72 moves up and down as the rotating shaft 58 moves in the axial direction. It is configured so that it does not occur. The outer end of the arm 72 projects outward from the magazine pace 54, and a grinding wheel pushing means 140 is attached to the outer end. This grinding wheel pushing means 140 is composed of a motor MP, a well-known torque limiter 142 attached to the output shaft of the motor MP, and a rotary ring 144 held at one end of the torque limiter 142. It consists of a tool commonly known as a wrench for rotating a bolt or nut with a hexagonal hole, and the head has a large surface formed on the surface of a sphere to engage with the hexagonal hole.
Its spherical shape allows it to be easily fitted into a hexagonal hole. The torque limiter 142 is the motor MP
If a resistance torque of a certain value or more is applied when rotating the rotor 144 by the rotational driving force of the rotation drive force, the rotor is provided to prevent the rotation force from being transmitted, which may result in idling. When loosening, the torque for removal can be set in that direction.

An indexing plate 150 is also provided at the bottom of the grinding wheel shaft 58, and a plurality of indexing grooves 152 are formed in the circumferential direction on the outer periphery of the indexing plate 150. 154
When the magazine 52 is inserted, the magazine 52 is stopped via the rotating shaft 58, and a desired one of the plurality of grinding wheels 14 stored in the magazine 52 is indexed and stopped at a grinding wheel exchange position with respect to the spindle head 12.

Incidentally, the index bin 154 is inserted into an appropriate one of the magazine paces 54.
The indexing plate 150 is formed to engage or retreat into the indexing groove 152 of the indexing plate 150 by the action of an indexing cylinder 156 attached to the position, and the indexing plate 150 is fixed to the lower surface of the gear wheel 66 by screws. A configuration is adopted in which the rotation shaft 58 rotates or stops together with the rotating shaft 58 depending on the rotation. Also, index groove 1
52 is provided corresponding to the number and position of the 140 grinding wheels held in the magazine 52, and is arranged to index any one of the grinding wheels 14 to the grinding wheel replacement position as described above.

Furthermore, the magazine pace 54 is connected to the guide rail 57 as described above.
．． 57 in the T-axis direction, this is a cylinder 74 attached to the lower end of the magazine pace 54.
is caused by Of course, instead of the cylinder 74, the well-known d? - The magazine pace 54 may be moved along the guide rail 57.
If necessary, the vertical movement mechanism of 8 can also be equipped with ball screws,
6. A linear movement mechanism such as a cut mechanism may also be used.

The cylinders 60, 74, and 156 used in the operation of the automatic grinding wheel exchanger 50 described above each use pressure oil supplied from a single fluid operation source, for example, a hydraulic I pump, and a solenoid valve and a pressure regulating valve, respectively. The configuration may be such that the control is performed by a well-known hydraulic circuit introduced through the solenoid valve, and the switching control of the solenoid valve may be controlled by a control command from the NC control device.

Next, the structure of each grinding wheel 14 will be explained with reference to FIG. 6
As described above, the grinding wheel 14 is constructed by attaching the grinding wheel 14a having various desired shapes to the grinding wheel sleeve 88, and the reference surface described above is formed on one end surface 90 of this grinding wheel sleeve 88. A female tooth hole 88a is formed in the center of the first shaft to complementarily fit into the male tooth shaft 16a of the grinding wheel shaft 16. There is also a bracket (19) at the bottom of the grinding wheel sleeve 88.
075 with screws, and this bracket 1
A nut member 192 is held in the blind hole inside 90 so as to be able to move slightly upward and downward. In other words, there is a whetstone on the top side of this nut part scoop 192! 1111116 male Qi 9
A female threaded hole 194 is formed to be screwed into the male thread 16b formed at the tip of the shaft 16a, and a hexagonal hole 194 into which the grinding wheel pushing means 1400 and the rotary ring 144 are fitted is formed on the downwardly projecting lower end surface of the bracket 190. A hole 196 is formed.

Next, the operation of the NC tool grinder equipped with an automatic grindstone exchanger configured as described above will be explained below.

First, a plurality of grinding wheels 14 each having a grinding wheel 14a formed into a desired shape by a truing device are stored in the magazine 52 of the automatic grinding wheel changing device 50 via a grinding wheel holder 56. In the wheel 14, the distance between the reference surface of the grindstone sleeve 88 and one end plane of the grindstone 14IL is also measured, and the measured data is input to the NC control device. As the above-mentioned distance measuring method, for example, the method disclosed in Japanese Patent Application No. 146235/1983 filed by the present applicant may be used.

Now, when attaching one desired grinding wheel 14 on the magazine 52 to the grinding wheel shaft 16 of the grinding spindle head 12,
2 is rotated around the b-axis in FIG. is parallel to the axis of the magazine 52, and the spindle head 12 itself is parallel to the axis of the magazine 52.
reach a position facing the Magazine pace 5 at the same time
4 is brought close to the spindle head 12 by moving and displacing it along the guide rails 57.57. If a used grinding wheel 14 is already attached to the grinding wheel shaft 16 of the spindle head 12, first return the used grinding wheel 14 to the empty grinding wheel holder 56 of the magazine 52, and then insert a new one. A desired grinding wheel 14 must be mounted on the grinding wheel shaft 16. For this purpose, the empty grinding wheel holder 56 of the magazine 52 is indexed to a grinding wheel exchange position below the grinding wheel shaft 16 by rotation of the magazine 52 about the E axis. Next, the magazine 52 is moved and displaced upward on the S axis, and the grinding wheel shaft 1 is placed in the empty grinding wheel holder 56.
The used grinding wheel 14 on 6 is received.

At this time, since the grinding wheel push-up means 140 and the rotary ring 144 are set in advance to be directly below the grinding wheel shaft 16, as the magazine 52 is displaced in the upward direction of the S axis, the ring wheel 144
4 is the nut member 192 in the used grinding wheel 14
The hexagonal hole 196 is inserted into the hexagonal hole 196. In this state, turner 14
4 in the nut release direction using the motor Mp, the threaded engagement between the nut member 192 and the threaded shaft 16b of the grinding wheel shaft 16 is released, and the pushing up force acting on the grinding wheel 14 is released. The female chi hole 88a of the whetstone 14 is the whetstone shaft 16.
The grinding wheel 14 is disengaged from the male gear shaft 16a, and the grinding wheel 14 is received in the grinding wheel holder 56. Therefore, when the magazine 52 is moved downward in the S-axis direction, the used grinding wheel 14 is completely detached from the grinding wheel shaft 16 and stored in the magazine 52.

Next, a desired new grinding wheel 14 to be newly installed on the male fourth shaft 16a of the grinding wheel shaft 16 is indexed to a grinding wheel replacement position directly below the grinding wheel shaft 16. This indexing action is performed by motor M
The magazine 5 is rotated by the rotation of w (Fig. 2) and the protrusion of the index pin 154 driven by the cylinder 156.
By applying index rotation to 2, the desired grinding wheel 1
This is achieved by rotating the grinding wheel holder 56 holding the wheel holder 1 to a position directly below the grinding wheel shaft 16 and stopping it, as in the case of the empty holder. Next, when the magazine 52 is moved and displaced again in the upward direction of the S axis, the female chi/nine holes 88a (FIG. 3) formed in the grindstone sleeve 88 of the new grinding wheel 14 are aligned with the male chi/g shaft of the grindstone shaft 16. 16a. When both are fitted, the rotary ring 144 of the grindstone pushing means 140 engages with the hexagonal hole 196 of the nut member 192. Next, the rotating metal 144
When the nut member 192 is rotated by the motor MP, the female thread 194 of the nut member 192 is screwed into the male thread 16b of the grindstone shaft 16, and then the nut member 192 is screwed to rotate the grindstone sleeve 8.
8 to tightly fit the fitting part into the Q. At this time, the rotation of the nut member 192 by the rotary ring 144 is as follows.
Since the torque is always maintained up to a certain upper limit torque value regulated by the torque limiter 142 (FIG. 2), the close fitting pressure at the tapered fitting portion is also always set at a constant level.

Therefore, each grinding wheel 4 is always attached to the grinding wheel shaft 16 in a fixed position. Moreover, the taper fitting allows the grinding wheel 14 to be mounted on the grinding wheel shaft 16 without any deviation. That is, one feature of the present invention is that the grindstone shaft 16
Even if the grinding wheel 14 mounted on the grinding wheel 14 is replaced, a constant mounting state is always guaranteed to be reproduced between the two.

According to the present invention, when the replacement and mounting of the grinding wheel 14 is completed as described above, the distance between the reference surface 86 of the spindle head 12 and the reference surface 90 of the mounted grinding wheel 14 is set. . By moving and displacing the grindstone shaft 16 in the axial direction (F axis in FIG. 1) with respect to the spindle head 12 using the motor Ml, the gap sensor 84 of the distance setting means 80 is set.
Therefore, the distance between the two reference planes 86 and 90 mentioned above is always set to a constant value. If a constant distance setting is always guaranteed no matter which grinding wheel 14 is attached, the distance between the reference surface 90 of each grinding wheel 14 and the cutting surface of the grinding wheel can be determined by shaping the grinding wheel in advance as described above. Since the measurement data is known at the same time, even before and after the grinding wheel 14 is replaced, the influence thereof will not affect the subsequent tool grinding work. In other words, the axial position of the grinding wheel 14 attached to the male chie=44++16a of the grinding wheel shaft 16 of the spindle head 12 is always guaranteed to be reproducible even before and after replacement. As a result, when grinding a tool, the cutting depth of the grinding wheel can be set as small as several microns even before and after replacing the grinding wheel, and highly accurate grinding work is guaranteed. The distance setting means 80 described above is comprised of a switch type contact detection device, and FIG. 4 shows its control circuit.

When the gap sensor 84 detects the reference surface 90 of the grinding wheel 14, the contact 484a in FIG. , 9NC control device is configured to turn off and stop the drive circuit of motor M, and when motor M stops, movement of the grindstone shaft 16 in the F-axis direction stops.

Further, in setting the distance described above, the grindstone shaft 16 is moved in the axial direction. Moreover, in this axial direction, the grindstone shaft 16 slides on the sliding radial bearing 22 in a non-rotating state, so there is a risk of metal contact between the grindstone shaft 16 and the inner surface of the bearing 22. However, according to the present invention, pressurized lubricating oil can be fed to the sliding radial bearing 22 and the thrust bearing 24 through the oil supply port 44, 46, so that the grindstone shaft 16 and these bearings 22, 24 By forming a film of lubricating oil in advance between the metal parts and the metal parts, it is possible to prevent the above-mentioned metal contact and achieve smooth sliding displacement. In this case, the pressurized lubricating oil is supplied to the I pump 120 by the solenoid switching valve 124 in FIG.
The oil pressure is controlled to be constant and regulated by the throttle 126 through the oil passage 130.

On the other hand, the oil passage 128 is used to supply lubricating oil during the cutting operation of the tool, and the lubricating oil whose pressure is regulated by the passage resistance 134 is supplied to each of the bearings 22 and 24. Moreover, an important condition that these sliding bearings 22 and 24 must have is that the temperature of the lubricating oil must be adjusted according to the rotational speed in order to maintain constant lubrication conditions even when the rotational speed of the grindstone shaft 16 fluctuates. There is a mantle wall. However, in the present invention, the oil temperature is detected by the thermistor 35 provided in the oil passage, and the temperature of the lubricating oil is adjusted by the automatic temperature regulator 122. Set it to warm.

In addition, in the embodiment described above, the grindstone shaft 16 using a sliding bearing is
However, if a tile-type grindstone shaft with a gable bearing is adopted for the spindle head 12, the tile can be moved by a motor, a goal screw, and a nut mechanism in the same way as in the above embodiment. If the grinding wheel 14 is configured to be able to be moved and displaced in the axial direction, it is possible to easily set the distance described above when replacing the grinding wheel 14 and installing it.

When the replacement and installation of the grinding wheel is completed, the automatic grinding wheel changing device 50
pull down the grinding wheel magazine 52 from the grinding wheel exchange position,
Then, it moves backward along the guide rails 57, 57 in a direction away from the υ grinding spindle head 12 by the operation of the cylinder 74. Therefore, the grinding spindle head 12 with the desired grinding wheel 14 mounted on the grinding wheel shaft 16 resumes the tool grinding action.

As described above, while sequentially replacing and installing the grinding wheels, the @NC tool grinder with the automatic grinding wheel changing device according to the present invention performs the desired grinding action on the tool to be ground (not shown) of the work head 100 (FIG. 1). It is given to

Effects of the Invention The present invention has been described based on the most preferred embodiment.According to the present invention, an NC tool grinding machine is equipped with an automatic grinding wheel changer, and a plurality of grinding wheels are sequentially changed to the grinding spindle head. Attached to the grinding wheel shaft, it is possible to grind complex tool shapes with high efficiency, and when replacing the grinding wheel, the reproducibility of the attachment accuracy of the grinding wheel to the grinding wheel shaft and the setting reproducibility of the grinding wheel cutting surface are fully guaranteed. In addition, since the female chi and the nine holes of the grinding wheel are fitted complementary to the male chi and the shaft at the tip of the grinding wheel, the prevention of runout is completely guaranteed. Furthermore, by supplying pressurized lubricating oil, rotation and axial displacement of the grinding wheel shaft can be achieved under appropriate lubrication conditions not only when replacing or installing the grinding wheel, but also during grinding operations.

[Brief explanation of the drawing]

FIG. 1 shows an N with an automatic grinding wheel changing device according to an embodiment of the present invention.
A perspective view of the main parts of the C tool grinder, Figure 2 is a partial sectional view of the automatic grinding wheel changer and spindle head of the same grinder, Figure 3 is a sectional view of the grinding wheel, and Figure 4 is the circuit of the distance setting means. figure. 8... Bed, 1o... Grinding wheel head, 12... Grinding spindle head, 14... Grinding wheel, 16... Grinding wheel shaft, 50...
・Automatic grinding wheel exchange device, 52... Grinding wheel magazine, 56
... Grinding wheel holder, 80... Contact detector, 84...
- Gap sensor, 140... Grinding wheel pushing means, 1
44... Rotary money. Patent applicant: Makino Milling Seiki Co., Ltd. Patent agent: Patent attorney: Akira Aomizu, patent attorney: Kazuyuki Nishidate, patent attorney: Takashi Nakayama, patent attorney: Akira Yamaguchi, patent attorney

Claims (1)

[Scope of Claims] 1. Automatic grinding wheel exchange in which tool grinding is performed by sequentially replacing and attaching a plurality of grinding wheels stored in a grinding wheel magazine to a male tooth shaft (9 shafts) at the tip of a grinding wheel shaft held in a spindle head. In a numerically controlled tool grinding machine equipped with a device, female teeth/4' holes are formed in each of the grinding wheels to be complementary fitted to the male teeth 9 at the tip of the grinding wheel shaft, and the male teeth 74 and the respective A grinding wheel pushing means for tightly fitting female teeth and holes of the grinding wheel with a constant surface pressure, a reference surface formed on the spindle head by the axial movement of the grinding wheel shaft, and a reference surface provided on each of the grinding wheels. 1. A numerically controlled tool grinding machine with an automatic grindstone exchange device, characterized in that it is configured to include distance setting means for setting the distance between and at constant intervals. 2. The grinding wheel pushing means is configured to raise the front male tip by screwing together a male screw formed at the tip of the male tapered shaft, a nut loosely provided on each of the grinding wheels, and screwing the male screw and the nut together with a constant torque. A numerically controlled tool grinding machine with an automatic grinding wheel changing device according to claim 1, further comprising a screw tightening device for tightly fitting the grinding wheel onto the grinding shaft. 3. The numerically controlled tool grinding machine with an automatic grinding wheel exchange device according to claim 1, wherein the distance setting means comprises a detection device fixed to the spindle head and detecting contact with a reference surface of each grinding wheel. 4. A numerically controlled tool grinding machine with an automatic grinding wheel exchange device that performs tool grinding by sequentially replacing multiple grinding wheels stored in a grinding wheel magazine with the male taper shaft at the tip of the grinding wheel held in the spindle head. In the J disk, a female tapered hole is formed in each of the grinding wheels to complementarily fit into the male chi Δ axis at the tip of the grinding wheel shaft, and the male chi 9 shaft and the female chi 9 hole of each grinding wheel are connected to each other. a means for pushing up a grinding wheel for closely fitting the two wheels with a constant surface pressure, and distance setting for setting a reference surface formed on the spindle head by the axial movement of the grinding wheel shaft and a reference surface provided on each of the grinding wheels at a constant interval. 1. A numerically controlled tool grinding machine with an automatic grinding wheel exchange device, characterized in that the grinding machine comprises a means for supplying pressurized lubricating oil to a bearing portion of the grinding wheel shaft.