JPS6248407A - Cutting tool setting device - Google Patents

Abstract

PURPOSE:To shorten the time required for cutting tool setting by measuring the tool set angles of a front cutting edge of a flat cutting tool to a feed direction in particular and automatically correcting the tool set angle in cutting tool setting devices. CONSTITUTION:An adjusting table 9 for correcting the angles of a flat cutting tool 11 is rotated around a rotary pin 21 on a tool rest 8. the drive of this rotation is performed by an adjusting screw 14 moved by a motor 24. In rotating the adjusting table 9, a clamp bolt 22 is unclamped, and then clamped after adjusting it. On the other hand, a pick-up 10 is fixed on the pick-up base 20 moving parallel to the moving direction of the tool rest 8. And cutting tool setting operation is performed in the order of face cutting, flange cutting, measuring, and cutting angle correction. The detection of the setting angle of the flat cutting tool 11 and automatic correction in a cutting machine by this device shortens cutting tool setting time.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a cutting tool setting device, and in particular, to a cutting tool setting device that measures the tool setting angle formed between a 1,000-bit front cutting edge and the cutting feed direction on a processing machine. This invention relates to a cutting tool setting device suitable for automatically correcting this.

[Background of the invention]

Conventional devices, such as a cutting tool edge position and shape detection device, generally include a shape detection means that traces the surface of the cutting tool to detect the shape of the surface, and a position that detects the position of the shape detection means. It consists of a detection means and a wear amount of the tool cutting edge.

It was a device that detects the position and shape of the tool cutting edge and detects the front cutting edge angle of the tool.

However, from measuring the front flank of the bite.

The chipping of the cutting edge occurs because the setting angle of a flat cutting tool with a complicated shape, such as the diamond cutting tool described in Japanese Patent Publication No. 58-58162, is measured and the cutting edge is directly traced with a stylus. No consideration was given to the possibility that

[Purpose of the invention]

The present invention has been made in order to solve the problems of the prior art described above, and is a tool setting device that automates the adjustment of the tool setting angle in setting a flat tool and reduces the time required for tool setting. Its purpose is to provide.

[Summary of the invention]

The configuration of the cutting tool setting device according to the present invention includes a main shaft that rotates with a workpiece attached thereto, a means for moving the cutting tool in the axial direction of the main shaft and in a direction perpendicular to the main shaft axis, and a means for moving the cutting tool in the direction perpendicular to the main shaft axis. A cutting tool setting device for adjusting a cutting tool setting angle formed between a front cutting edge of the cutting tool and a cutting feed direction in a cutting device having a means for mounting the cutting tool, the cutting tool setting device comprising: Shape detection means for cutting the cutting tool into a machined surface of an object, transferring the blade shape, and detecting a cutting tool setting angle by tracing the blade shape transferred to the machined surface, and the detection result thereof. Based on this, calculation control means is provided for automatically correcting the setting angle of the cutting tool to a predetermined setting angle by driving the means for mounting the cutting tool.

In addition, 1. The present invention comprises means for detecting, on a processing machine, the cutting tool setting angle of a flat cutting tool attached to a cutting device, and means for automatically correcting the cutting tool setting angle to a predetermined cutting tool setting angle based on the detection result. It is what it is.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 is a perspective view showing the appearance of a processing machine equipped with a cutting tool setting device according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of the cutting tool setting angle detection section and adjustment section, and FIG. 3 is a driving electric circuit diagram of the adjustment table and pickup of FIG. 2.

As shown in FIG. 1, a spindle 2 that rotatably supports a workpiece 1 and a spindle motor 3 that rotationally drives the workpiece 1 are fixed on a bed 4. A table 5 that can slide only in a direction perpendicular to the direction (X-axis direction indicated by an arrow; cutting feed direction) is fixed. The table 5 is driven by converting the rotational movement of the X-axis motor 7 into linear movement of the sliding portion of the table 5 via the feed screw 6. A tool rest 8 is fixed on the table 5 and is slidable in a direction perpendicular to the X-axis direction and parallel to the spindle rotation axis (Z-axis direction indicated by the arrow: cutting direction). The drive 8 converts the rotation of the Z transport motor 17 through the feed screw 16 into a linear motion of the sliding part of the cutting head.

An adjustment stand 9 is fixed on the tool rest 8, and on the adjustment stand 9 there is also a tool holder 12 for fixing a flat cutting tool 11 related to a cutting tool. It makes up the department.

An e-pickup 10 that can detect displacement in the Z-axis direction is still fixed on the table 5.

The detailed configuration of the adjustment table 9 and the pickup 10 is shown in FIG.

As shown in FIG. 2, the adjustment table 9 is provided with a rotating pin 21 inserted with one gap therebetween, and this rotating pin 21 is fixed to the tool post 8.

The adjustment table 9 is rotatable on the tool rest 8 within the X-Z plane with the rotation pin 21 as the center of rotation.

This rotation is driven by an adjustment screw 14 screwed into an adjustment block 13 fixed on the tool post 8.

The adjustment screw 14 performs rotational movement and linear movement via the sysspline coupling 23 by rotation of the adjustment table rotation motor 24. At this time, the adjustment table 9 is sandwiched between the adjustment screw 14 and the spring 15.

The adjustment screw 14 and adjustment table 9 are brought into contact. The adjustment table 9 is fixed to the tool rest 8 by a fixing bolt 22, and when rotating the adjustment table 9, the fixing bolt 22 is opened, and after the adjustment is completed, the fixing bolt 22 is tightened. These constitute means for mounting a cutting tool and adjusting the set angle of the cutting tool.

On the other hand, the pickup 10 is fixed on a pickup base 20 that has a stylus 10a at its tip and is movable in parallel to the moving direction (Z-axis direction; cutting direction) of the tool post 8. The pickup base 20 is driven by converting the rotation of the sensor polymotor 18 into linear motion via the feed screw 19. A shape detection means is configured to detect the angle formed between the cutting edge and the cutting feed direction.

Next, the structure of the electric circuit for driving the adjustment table 9 and the pickup 10 will be explained with reference to FIG. 3.

In the figure, the same reference numerals as in FIG. 2 indicate the same parts, so the explanation thereof will be omitted.

The electric circuit for driving the adjustment table rotation motor 24 includes a direction discriminator circuit 31 that controls the rotation direction of the motor △ and a motor driver 32°, and the output signal of the pickup 10 is transmitted through an amplifier 25 and a filter 26. A/D converter 2
After being converted into a digital signal by step 7, the signal is input to the arithmetic processing unit 28.

The electric circuit for driving the sensor feed motor 8 that drives the pickup base 20 to which the pickup 10 is fixed consists of a motor driver 33 and a direction discrimination circuit 34. It has a function of stopping the sensor polymotor 18.

The arithmetic processing unit 28 is integrally connected to the control panel 35 of the processing machine, and has an arithmetic control function such as a microcomputer, and is connected to the electric circuit for driving the adjustment table rotation motor 24 and the sensor polymotor 18. electric circuit for driving
It is connected to each control circuit such as a circuit for output signals from the pickup 10. That is, the arithmetic processing unit 28 has
Calculation processing is performed based on the input signal from the pickup 10 constituting the shape detection means, a function for starting and stopping the adjusting table rotation motor 24 and the sensor feed motor 18, and the calculation processing results are sent to the X-Y plotter 29. It has a function to output and display, and a function to input control-related input data from the console gear 30.

The operation of the cutting tool setting device of this embodiment having the configuration described above will be explained with reference to FIGS. 4 and 5 in conjunction with FIGS. 1 to 3.

FIG. 4 is an explanatory diagram of the operation of a cutting tool setting device according to an embodiment of the present invention, in which (a) is a time chart, and (b) is a time chart.
5 is an explanatory diagram of the operating procedure, and FIG. 5 is an output diagram showing the blade shape when the cutting tool setting angle is adjusted.

In the time chart of FIG. 4(a), the Z transport motor 1
7. X-axis feed motor7. The rotation direction of each motor of the sensor polymotor 18 and adjustment table rotation motor 24 is set at the step where the clockwise direction (hereinafter referred to as CW direction) is upward and the counterclockwise direction (hereinafter referred to as 00W direction) is downward. It shows.

Also, the sensor output of the pickup 10, the clamp of the adjustment table 9, and the main shaft motor 3 are all turned on.

Indicates the OFF timing.

The arrows in the figure indicate the order of operation.

(in Fig. 4) is an explanatory diagram of the operation procedure of (1) end face cutting, (2)
) The steps of plunge cutting, (3) measurement, and (4) correction of bite angle are illustrated using operation steps ■ to ■. In the following explanation, the codes of operation steps ■ to ■ are written in parentheses. We are trying to provide a control.

In this embodiment, the workpiece 1 is a donut-shaped disk, and an example of a cutting tool setting angle adjustment operation when machining the end face (disk surface) will be described.

At the inner periphery of the workpiece 1 driven by the main spindle motor 3, the Z transport simulator 17 is rotated in the CW force direction, and the flat cutting tool 11 is advanced (step 2).

After making a predetermined depth of cut, the X-axis motor 7 is rotated in the CW force direction to move the table 5 to the right and flatten the machine (11).
Cut the workpiece 1 from the inner circumference to the outer circumference (step ■). After cutting, the Z transport simulator 17 is rotated in the CCW direction to move the tool rest 8 backward (step ■). With the flat cutting tool removed from the workpiece 1, the X transport simulator 7 is rotated in the CCW direction to move the table 5 to the left (step ■), and return the cutting tool 11 from the outer peripheral surface of the workpiece 1 to the inside of the throat 10 to 20 degrees.

Next, the Z transport motor 17 is rotated in the CW force direction to move the tool post 8 forward, and the flat cutting tool 11 is pushed into the workpiece 1.
Immediately after plunge cutting (step ■) with a depth of cut d of 10 μm, the Z transport motor 17 is rotated in the CCW direction to move the flat cutting tool 11 backward.

In this procedure, the work of cutting 1,000 bits into the machined surface of the workpiece 1 and transferring the blade shape is performed.

Thereafter, the X-transport simulator 7 is rotated in the CCW direction to further move the table 5 to the left, and with the rotation of the spindle motor 3 stopped and the workpiece 1 completely stopped, the tip of the stylus 10a of the pickup 10 is plunge cut. The sensor feed motor 18 is rotated in the CW force direction, and the circle of the blade shape transferred to the machined surface of the workpiece 1 is Make a contact trace on the circumferential groove (of the step).

In this state, the output signal of the pickup 10.

As shown in FIG. The voltage is input to the direction classification circuit 34 via the filter 26, and when the preset voltage V is reached, the rotation of the sensor transmission motor 18 is stopped.

The output voltage from the pickup 10 is converted into displacement in advance, and the set voltage V when the pickup 0 is brought into contact with the workpiece 1 and stopped is O volts. This set voltage V is set higher than the voltage value corresponding to the depth of cut d of the plunge cut. After stopping the sensor feed motor 18, the X-axis feed motor 7 is rotated in the CW force direction to move the pickup 10 to the right toward the outer periphery of the workpiece 1.

The front cutting edge length of the flat cutting tool 11 is 1.2 mm, and as described above, from the inner side 1wn of the circumferential groove of the blade shape transferred to the machined surface, the width of the circumferential groove, that is, 1,000 cutting edges 11 Picked up 3 groups including the front cutting edge length of 1.2mm 10
Contact tracing will be performed using the stylus 10a.

All output signals from the pickup 10 at this time are input to the arithmetic processing unit 28, and the feed amount on the X axis is 10 μm.
Data is stored at time intervals corresponding to the pitch.

Among the data stored in the arithmetic processing unit 28.

A linear approximation of y = a Find v bQ.

Here, the straight line y'=ax-)-b corresponds to the machined surface.

Next, line z, 5 μm from this machined surface, 1
= aO'

The data group (z
, k.

xk). In other words, measurement point data at a pitch of 10 μm on the machined surface and 10 points at a distance of 5 μm from the machined surface.
The data remaining after subtracting the corresponding points at the μm pitch corresponds to the inclination of the front cutting edge of the flat cutting tool 11 transferred to the processing surface.

In this way, only the data group 5 μm below the machined surface, that is, the data representing the blade shape of the flat cutting tool, is separated, and from this (Zk, X+c).

Calculate Z k = a kX b + b k using the least squares method.

The coefficient ak, that is, the inclination of the front cutting edge of the flat cutting tool 11 is determined.

θ=tan−′ (a ka , )) is the inclination angle of the front cutting edge of the flat cutting tool 11.

Here, assuming that the predetermined cutting tool setting angle, that is, the target inclination angle of the front cutting edge of the flat pit is 0.007° (θ-0,
007)' The adjustment table rotation motor 24 is rotated by 007)' (step ■). At this time, the direction of rotation of the motor 24 for rotating the adjustment table is (θ-0,007)'〈If O, then CW force direction (θ-0,007)'>If O, then the direction separating circuit rotates in the CCW direction. 31, and in this way, the adjustment table 9 is rotated and the set angle is automatically corrected.

Using the cutting tool setting device of this embodiment, the output line traced by the stylus 10a of the pickup 10 is a diagram of the blade shape when adjusting the cutting tool setting and fixed angle, that is, the blade shape transferred to the machined surface. It is shown in FIG.

The line in the figure is the output line from the pickup 10.

The arrow indicates the cutting feed direction.
A scale of 1 μm in the rY-axis direction is shown.

Fig. 5 (1) The inclination of the front cutting edge surface of the flat cutting tool 11, which was -1.25 degrees before the angle correction, has changed to +0 after one correction Fig. 5 (2)
．． 02°, Figure 5 (3) After two corrections, +0 of the target inclination angle
．． The angle is 007°.

According to this embodiment, since the setting angle of 1,000 bytes is detected on the processing machine and automatically corrected, the setting angle of 1,000 bytes is detected and automatically corrected.
Compared to 0 to 60 minutes, in this example, the adjustment time is 5 minutes and 1/8 to 60 minutes.
It can be shortened to 1/12.

Make a plunge cut on the machined surface of the workpiece with a flat tool,
To trace and measure the transferred blade shape,
It is possible to determine the inclination angle of only the front cutting edge surface that contributes to the creation of the cutting surface.

When calculating the inclination angle of a plunge-cut moon shape,
Since the machined surface obtained by cutting the end face is used as a reference, it is less susceptible to error factors during measurement due to swinging of one pick-up or waviness of the workpiece.

In addition, in the above-mentioned embodiment, an example of a flat cutting tool with one front cutting edge surface was explained, but the present invention is not limited to this, and can also be applied to a 1,000 cutting tool with two or more front cutting surfaces. can.

In other words, when detecting the inclination angle by tracing the blade shape transferred to the machined surface of the workpiece by the 1,000-byte shape detection means, the inclination angle of only the front cutting edge surface that contributes to the creation of the cutting surface is detected. All you have to do is find it and automatically correct it to a predetermined bite setting angle.

Although the above-mentioned embodiment was applied to cutting the end face of a workpiece, it is unlikely that similar effects can be obtained in the case of cylindrical cutting as the only difference is the position of the cutting tool, but the output data is the same. Needless to say.

Further, in the above-mentioned embodiment, an example of a contact type pickup was explained as a shape detection means for detecting a cutting tool setting angle by tracing the blade shape transferred to the processing surface, but the present invention is not limited to this. Instead, the spot diameter is 1 to 3μ.
The same detection output data can be obtained even if an optical displacement meter of 1.5 m is used, and the same effects as in the above-mentioned embodiment can be obtained.

Furthermore, in addition to measuring the blade shape with the pickup used in the previous example, we also measured the blade shape on the processing machine.

It is also possible to measure the surface roughness of the machined surface and compare it with a predetermined surface roughness to determine pass or fail.

〔Effect of the invention〕

As described above, according to one aspect of the present invention, the adjustment of the cutting tool setting angle in setting the flat cutting tool is automated.

It is possible to provide a cutting tool setting device that reduces the time required for tool setting.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the appearance of a processing machine equipped with a cutting tool setting device according to an embodiment of the present invention, FIG. 2 is an enlarged perspective view of the cutting tool setting angle detection section and adjustment section, and FIG. The figure shows the second
Fig. 4 is a driving electric circuit diagram of the adjustment table and pickup, and Fig. 4 is an explanatory diagram of the operation of the cutting tool setting device according to an embodiment of the present invention, (a) is a time chart), and (b) is an explanation of the operation procedure. FIG. 5 is a drawing force line showing the blade shape when adjusting the setting angle of the cutting tool. △ 1...Workpiece, 2...Spindle, 3...Spindle motor, 5
...Table, 6...Feed screw, 7...X-axis feed motor, 8...Turret, 9...Adjustment stand, 10...
pick amp. 10a...Stylus% 11...Flat bite, 12...
Bit holder, 13...adjustment block, 14...adjustment screw. 15... Spring, 16... Feed screw, 17... Z-axis street motor, 18... Sensor feed motor 19... Feed screw, 20... Pick-up base, 21... Rotating bin, 24... ...Adjustment table rotation motor, 25...Amplifier, 26...Filter, 27...A/D converter, 28...Arithmetic processing unit, 31.34...Direction separation circuit, 32゜33 ...Motor driver, 35...
Processing machine control panel.

Claims (1)

[Scope of Claims] 1. A spindle that rotates with a workpiece mounted thereon, means for moving a cutting tool in the axial direction of the spindle and in a direction perpendicular to the spindle axis, and means for mounting the cutting tool. A cutting tool setting device for adjusting a cutting tool setting angle formed between a front cutting edge of the cutting tool and a cutting feed direction in a cutting device having the following: , a shape detection means for cutting with the cutting tool to transfer the blade shape, tracing the transferred blade shape on the machined surface to detect the cutting tool setting angle, and based on the detection result, A cutting tool setting device comprising: arithmetic control means for automatically correcting the cutting tool setting angle to a predetermined cutting tool setting angle by driving the cutting tool mounting means. 2. In the device described in claim 1, the means for mounting the cutting tool includes an adjustment table for adjusting the setting angle of the cutting tool, and a drive means for rotating the adjustment table. Cutting tool setting device. 3. The cutting tool according to claim 1, wherein the cutting tool is a flat cutting tool having a front cutting surface that contributes to the creation of a cutting surface, and the arithmetic control means is configured to control whether the flat tooling an arithmetic control device that calculates the measurement point traced by the shape detection means to detect the inclination angle of the flat cutting tool; and feeds back the calculation result to the driving means of the means for mounting the cutting tool; and a control circuit for automatically correcting the cutting tool setting angle to a predetermined cutting tool setting angle. 4. In either of claims 1 or 2, the cutting tool is a flat tool having two or more front cutting surfaces, and the flat tool is transferred onto the machined surface of the workpiece. When the shape detection means traces the blade shape and detects the inclination angle of the flat cutting tool, the inclination angle of only the front cutting edge surface that contributes to the creation of the cutting surface is determined and automatically corrected to a predetermined cutting tool setting angle. A cutting tool setting device that performs 5. The cutting tool setting device according to claim 1, wherein the shape detection means is capable of measuring the surface roughness of the machined surface after cutting.