JP2000094247A - Deflection removing device and deflection removing method of cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflection removing device of cutting tool to remove the deflection of the cutting tool of a cutting device which cuts a work by bringing the cutting tool rotating being installed to a rotary shaft into contact with the work, and to realize the rotation of the cutting tool without generating a deflection securely constantly. SOLUTION: This deflection removing device of cutting tool is provided with a grinding wheel 12 fixed to the work table 51 of a cutting device, and moving integrally; a deflection amount detecting sensor 13 to detect the deflection amount of a cutting tool 54; and a contact detecting sensor to detect the abutting of the cutting tool 64 and the grinding wheel 12. In this case, the deflection amount is detected by the deflection amount detecting sensor 13 by rotating the cutting tool 64 installed to a rotary shaft, and the grinding wheel 12 is advanced to the cutting tool side by moving the work table 51. After the cutting tool 64 and the grinding wheel 12 are contacted, the grinding wheel 12 is advanced to the cutting tool 64 side further, as the deflection amount part, so as to grind off the deflection part of the cutting tool 64.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a run-out device for a cutting tool, which removes the run-out of a cutting tool of a cutting device which cuts a rotating cutting tool attached to a rotating shaft against a workpiece. The present invention relates to a tool run-out method.

[0002]

2. Description of the Related Art Heretofore, cutting apparatuses for performing various cutting processes such as milling and drilling by attaching a cutting tool such as an end mill or a drill to a tip of a rotating shaft such as a spindle and rotating the cutting tool have been widely used. In such a cutting device, when the cutting tool oscillates during the rotation drive, the processing surface of the work (workpiece) may be roughened or a large residual stress may be generated. Further, since the load applied to the cutting tool is uneven, the life of the cutting tool may be shortened. Therefore, it is important to reduce the run-out of the cutting tool as much as possible from the viewpoint of improving the quality of the cutting process, improving the durability of the cutting tool, and reducing the cost.

Conventionally, in order to reduce the run-out of the cutting tool, the rotational accuracy of the rotating shaft, the machining accuracy of the cutting tool, the mounting accuracy of the cutting tool on the rotating shaft, and the like have been individually improved. Was.

[0004]

However, there is a limit in improving the rotation accuracy of the rotating shaft, the machining accuracy of the cutting tool, and the mounting accuracy of the cutting tool on the rotating shaft. Cannot be eliminated. In addition, since the mounting accuracy of the cutting tool to the rotating shaft depends on the individual's skill at the time of mounting, the mounting operation may be repeated many times until an appropriate mounting accuracy is obtained.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is intended to reduce the run-out of a cutting tool of a cutting device which cuts a rotating cutting tool attached to a rotating shaft against a workpiece. An object of the present invention is to provide a cutting tool run-out device and a cutting tool run-out method that always allow a cutting tool to rotate without deflection.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a cutting apparatus for cutting a workpiece by bringing a rotating cutting tool attached to a rotating shaft into contact with a workpiece.
A cutting tool run-out device for taking the run-out of the cutting tool, a grinding wheel, a grinding wheel contact means for contacting the grinding wheel with a processing portion peripheral surface of the cutting tool that rotates with the rotation axis, The object is achieved by providing a cutting tool run-out device including a grindstone detaching unit that releases contact between the grindstone and the cutting tool.

[0007] In order to achieve the above object, the present invention provides a cutting device for cutting a run-out of a cutting tool of a cutting device which cuts a rotating cutting tool attached to a rotating shaft against a workpiece. A tool run-out method, wherein a run-out amount detecting step of detecting a run-out amount of the rotating cutting tool, and after the run-out amount detecting step, a processing portion peripheral surface of the cutting tool attached to the rotating shaft and rotating. And a grinding stone contacting step of advancing the grinding stone in the direction of the grinding tool by the runout amount, and after the grinding stone contacting step, releasing the contact between the grinding stone and the grinding tool. The object is achieved by providing a method for removing a cutting tool including a grinding wheel detachment step.

In the cutting tool runout apparatus of the present invention and the cutting tool runout method of the present invention, a whetstone is brought into contact with a rotating cutting tool which is already mounted on a rotating shaft of the cutting apparatus, and a cutting tool runout is performed. By shaving off, it is possible to completely eliminate run-out of the cutting tool during rotation. In addition, because the run-out is taken with the cutting tool attached to the rotating shaft, even if the allowable range of the rotating accuracy of the rotating shaft and the processing accuracy of the cutting tool is set widely, the accuracy error is corrected in the cutting device as the final product. Therefore, it is possible to eliminate the runout of the cutting tool during rotation.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a first embodiment of a cutting tool runout device of the present invention, together with a cutting device including a cutting tool that removes runout by the cutting tool runout device.

First, a description will be given of a cutting device including a cutting tool for removing runout by the cutting tool runout device of the present embodiment. As shown in FIG. 1, the cutting device 50 places a workpiece and places it in three XYZ directions (arrows A in the drawing).
Direction, direction B, and the front and back sides of the drawing), and a fixedly arranged spindle motor 60
And a control unit (not shown).

The spindle motor 60 includes a casing 61
And a rotating shaft 62 rotated by the motor. The rotating shaft 62 has a grip 63 at one end on the work table 51 side, and the grip 63 is exposed from the casing 61. Then, the cutting tool 64 is held by the holding portion 63, and the cutting tool 64 rotates together with the rotating shaft 62. The workpiece is processed by rotating the cutting tool 64 mounted on the grip 63 while moving the work table 51 based on the control from the control unit.

The run-out device 10 for a cutting tool according to the present embodiment.
Is a support member 11 fixed on a work table 51.
And a stick whetstone 12 supported by the support member 11
And a shake amount detection sensor 13. By moving the work table 51 based on the control of the control unit, the stick whetstone 12 advances and retreats with respect to the cutting tool 64, and comes into contact with and separates from the cutting tool 64. Further, the cutting tool run-out device 10 according to the present embodiment is used.
Has a contact type or non-contact type displacement sensor (not shown).

The material of the stick whetstone 12 is not particularly limited, and can be appropriately selected according to the cutting tool 64, such as a diamond whetstone or a CBN whetstone. The run-out amount detection sensor 13 is a contact-type or non-contact-type displacement sensor that detects the amount of run-out of the rotating cutting tool 64. The shake amount detection sensor 13 and the control unit
When the control unit determines whether the shake amount detected by the shake amount detection sensor 13 is 0, the control unit also functions as a shake detection unit that detects shake. As the shake amount detection sensor 13, a laser displacement meter, a capacitance type sensor, an eddy current type sensor, or the like can be used. The contact detection sensor is a sensor that detects contact between the cutting tool 64 and the stick whetstone 12, and a non-contact sensor such as an AE (Acoustic Emission) sensor can be used. Also,
It can also be constituted by a voltage generating means for generating a very small voltage between the cutting tool 64 and the stick whetstone 12, and a galvanometer, an AE sensor, a displacement sensor or the like which detects conduction due to contact.

The control unit moves the work table 51 based on signals from the shake amount detection sensor 13 and the contact detection sensor. Then, by moving the work table, the stick grindstone 12 is advanced in the direction of the cutting tool 64 (left direction in FIG. 1), and the stick grindstone 12 is brought into contact with the cutting tool 64, whereby the cutting tool 12 is attached to the stick grindstone 12. Let them sharpen. In addition, stick whetstone 12
Is retracted from the cutting tool 64 to release the contact between the stick whetstone 12 and the grinding tool 64.

Next, an embodiment of the cutting tool runout method of the present invention, which is an operation of the cutting tool runout apparatus having the above-described configuration, will be described. FIG. 2 is a flowchart illustrating a control flow of the cutting tool run-out device of the present embodiment. When performing the run-out by the run-out device of the cutting tool having the above-described configuration, the operator first fixes the support member 11, the stick grindstone 12, and the run-out amount detection sensor to the work table 51, and After the gripper 63 grips the cutting tool 64, the spindle motor 60 is driven to rotate the cutting tool 64 (step S11). And the control part acquires the run-out amount a of the cutting tool 64 based on the signal from the run-out amount detection sensor 13 (step S13).

Subsequently, the work table 51 is moved to advance the stick grindstone 12 at a predetermined speed in the direction of the cutting tool 64 (step S15). When the stick whetstone 12 and the cutting tool 64 come into contact with each other and obtain a predetermined signal indicating the contact from the contact detection sensor (step S17), the control unit decreases the speed from this position and further reduces the speed in the same direction. The work table 51 is moved to (step S19). As a result, the stick grindstone 12 comes into contact with the rotating cutting tool 64, and the cutting tool 64 advances while sharpening and shaking off the portion of the cutting tool 64 that comes into contact with the surface of the stick grindstone 12.

When the work table is further moved from the position where the signal is output from the contact detection sensor, the stick grindstone 1 is moved.
2 is moved by the shake amount a detected by the shake amount detection sensor 13 (Step S21; Y), the control unit temporarily stops the movement of the work table 51, retreats the grindstone from the cutting tool 64, and shakes again. The run-out amount of the cutting tool 64 is obtained based on the signal from the amount detection sensor 13 (step S2).
3).

When the shake amount is 0 (step S25; Y)
Then, the work table 51 is moved in the opposite direction to the above, the stick whetstone 12 is retracted from the cutting tool 64 (step S27), and then the work table 51 is arranged at the initial position to complete the run-out processing. Let it. If the shake amount is not 0 (step S25; N), the process returns to step S15 and replaces the shake amount with the shake amount b acquired in step 23. Thereafter, the operations in steps S15 to S25 are performed until the shake amount becomes 0. repeat.

According to the present embodiment, the stick grindstone 12 is brought into contact with the rotating cutting tool 64 which is already mounted on the rotating shaft of the cutting device 50 to cut off the run-out of the cutting tool 64, so that the cutting tool 64 during rotation is rotated. Swing can be minimized. According to this embodiment, since the run-out is taken in a state where the cutting tool 64 is attached to the rotary shaft, the cutting device 50 as a final product can be used even if the allowable range of the rotational accuracy of the rotary shaft and the processing accuracy of the cutting tool is set wide. , The accuracy error is corrected, and it is possible to minimize the runout of the cutting tool 64 during rotation. And the cutting device 5
By eliminating run-out of the cutting tool 64 during rotation,
The durability of the cutting tool 64 can be improved, and the quality of the cutting process can be improved. According to the present embodiment, since the shake amount is detected in advance by the shake amount detection sensor 13 and the shake amount is removed, the shake can be efficiently eliminated. According to the present embodiment, since the shake is removed by the shake amount detection sensor 13 until the shake amount becomes zero, the shake can be reliably eliminated.

Next, a description will be given of a second embodiment of a cutting tool run-out device according to the present invention. Note that, in the present embodiment, the same reference numerals are given to the same devices and members as those in the first embodiment shown in FIG. FIG.
FIG. 2 is a schematic configuration diagram showing a second embodiment of a cutting tool runout device of the present invention, together with a cutting device including a cutting tool that takes off runout by the cutting tool runout device.

In the cutting tool run-out device of the present embodiment, as shown in FIG. 3, a rotating grindstone 12 'is supported on a support member 11, and the support member 11 is supported by a mechanism (not shown) using a motor or the like. The cutting tool 64 comes into contact with the cutting tool 64 while being rotated. The cutting tool 64 is supported by the second support member 11 ′ on the work table 51 at a height at which the run-out of the cutting tool 64 can be detected. The material of the rotary grindstone 12 'is not particularly limited, and can be appropriately selected according to a cutting tool, such as a diamond grindstone or a CBN grindstone. A rotating whetstone 12 'is provided in place of the stick whetstone, and the runout amount detection sensor 1
3 is supported by the second support member 11 ′, and is the same as the above-described first embodiment. Although not shown in the present embodiment, the same contact as in the first embodiment is performed. A detection sensor is provided.

As described above, the same operation and effect as those of the first embodiment can be obtained even if the rotary whetstone 12 'is used as a whetstone and the runout amount detection sensor 13 is supported separately from the whetstone.

The present invention is not limited to the above embodiment, and the shape, size, material, etc. of each member can be appropriately changed without departing from the spirit of the present invention. For example, in each of the above-described embodiments, the grindstone (the stick grindstone 12 and the rotating grindstone 12 ′) is supported by the support members 11 and 11 ′ fixed to the work table 51, and the movement of the work table 51 causes the cutting tool 64 to move. Although it is designed to reciprocate, in any of the embodiments, an advancing / retreating mechanism for advancing / retreating the grindstone with respect to the cutting tool 64 can be provided separately from the work table 51. At this time, the control means for controlling the advance / retreat mechanism includes the cutting device 50
Can be provided separately from the control unit. In each of the above-described embodiments, the whetstone (stick whetstone 12, rotating whetstone 12 ')
The grindstone is brought into and out of contact with the cutting tool 64 by bringing the cutting tool 64 into and out of contact with the cutting tool 64, but in any of the embodiments, the grindstone is fixed and the cutting tool side (spindle motor 60) is moved. It is also possible to make the whetstone advance and retreat.

The direction of rotation of the cutting tool 64 is not particularly limited. However, by rotating the cutting tool 64 in a direction opposite to the direction of rotation during cutting, the cutting edge of the cutting tool 64 becomes a grindstone (stick grindstone 12, rotating grindstone 12 '). ) Can be avoided as much as possible. Further, in the second embodiment, even if the cutting tool 64 is rotated in the same direction as during cutting, the rotation speed of the
By controlling each rotation so as to be slower than the rotation speed 2 ′, it is possible to prevent the blade tip from hitting the rotating grindstone 12 ′ and causing the blade to spill as much as possible.

In each of the above-described embodiments, the run-out amount detection sensor 13 is provided, and the run-out amount is detected for each cutting tool to determine the sharpening amount by the grindstone (the advance amount of the grindstone). The detection sensor 13 may not be provided, and a predetermined sharpening amount obtained from experience values may be set in advance. However, the method of detecting the shake amount and determining the sharpening amount based on the obtained shake amount has an advantage that the shake does not remain or the shaving is not excessively performed. In each of the embodiments described above, the grinding wheel advances and is controlled by the control unit.
Although the vehicle is retracted, advance and retreat may be performed manually by an operator.

In the first embodiment, the stick grindstone 12 and the shake amount detection sensor 13 are supported by the same support member 11. However, as in the second embodiment, the stick grindstone 12 and the shake amount sensor 13 are supported. 13 may be supported by different support members. The cutting tool that can perform run-out according to the present invention can be an end mill, a drill, and other various cutting tools by selecting a grindstone, and the material thereof is also carbide, cermet, ceramics, carbon tool steel, and the like.
There is no particular limitation.

In the above embodiment, if the runout is not zero, the process returns to step S15 to sharpen the cutting tool based on the new runout. It is also possible to advance the grindstone (stick grindstone 12, rotating grindstone 12 ') by a predetermined minute amount to make a correction and end the operation, or to repeat this correction until the runout becomes zero.

[0028]

As described above, according to the cutting tool runout apparatus and the cutting tool runout method of the present invention, the runout of the cutting tool is minimized as much as possible, and the cutting tool is always used in the cutting apparatus. It is possible to rotate without rotational vibration.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of a cutting tool run-out device of the present invention, together with a cutting device including a cutting tool that removes run-out by the cutting tool run-out device.

FIG. 2 is a flowchart showing a flow of control of a cutting tool run-out device of the present embodiment.

FIG. 3 is a schematic configuration diagram showing a second embodiment of a cutting tool run-out device of the present invention, together with a cutting device including a cutting tool that removes run-out by the cutting tool run-out device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cutting tool run-out device 11 Support member 11 'Second support member 12 Stick grindstone 12' Rotating grindstone 13 Runout amount detection sensor 50 Cutting device 51 Work table 60 Spindle motor 61 Casing 62 Rotating shaft 63 Gripping portion 64 Cutting tool

Claims (5)

[Claims] 1. A cutting tool run-out device for removing run-out of a cutting tool in a cutting device mounted on a rotary shaft, the cutting tool rotating and abutting on a workpiece to cut the workpiece. A grinding wheel contacting means for bringing the grinding stone into contact with a processing portion peripheral surface of the cutting tool which rotates together with the rotating shaft; and a grinding stone detaching means for releasing the contact between the grinding stone and the cutting tool. Cutting tool runout device. 2. The method according to claim 1, further comprising: a run-out amount detecting unit that detects a run-out amount of the rotating cutting tool; and a contact detecting unit that detects contact between the grinding wheel and the cutting tool. The grindstone is advanced in the cutting tool direction from the position where the contact between the grinding stone and the cutting tool is detected by the contact detecting means in the direction of the cutting tool by the runout amount detected by the runout amount detecting means, The cutting according to claim 1, wherein after the grinding wheel contacting means advances the grinding wheel with respect to the grinding tool by the amount of run-out, the contact between the grinding wheel and the grinding tool is released. Tool run-out device. 3. A wobble detecting means for detecting run-out of the rotating cutting tool, wherein the whetstone detaching means is configured to detect the whetstone and the cutting tool when the run-out of the cutting tool is no longer detected by the run-out detecting means. 2. The contact with the device is released.
Or a runout device for a cutting tool according to claim 2. 4. A cutting tool run-out method for taking the run-out of said cutting tool of a cutting device, wherein said cutting tool is mounted on a rotating shaft and abuts a rotating cutting tool against a workpiece. A run-out amount detecting step of detecting a run-out amount of the cutting tool, and after the run-out amount detecting step, a grinding wheel is brought into contact with a processing portion peripheral surface of the rotating cutting tool attached to the rotating shaft,
A grinding wheel contacting step of causing the whetstone to advance in the direction of the grinding tool by the runout amount; and after the grinding stone contacting step, a grinding stone detaching step of releasing the contact between the grinding stone and the grinding tool. A runout method for a cutting tool, characterized in that: 5. A cutting tool run-out method for taking the run-out of the cutting tool of a cutting device which cuts a cutting tool which is attached to a rotary shaft and rotates so as to abut on a workpiece, wherein the rotary shaft comprises: A grinding wheel contacting step of bringing a grinding stone into contact with a processing portion peripheral surface of the cutting tool which is attached to and rotating; a deflection detection step of detecting a deflection of the rotating cutting tool in the grinding stone contacting step; and a deflection detection step. A grinding wheel detaching step of releasing contact between the grinding wheel and the cutting tool when the deflection of the cutting tool is no longer detected.