JPS61110206A - Coordinate system setting device of machine tool - Google Patents

Abstract

PURPOSE:To automatically set working operations on a work so as to improve the accuracy and efficiency of the working operations, by measuring the position on the work fitting surface side with a measuring means on the tool rest side. CONSTITUTION:A work W is grasped by the clicks D of a chuck C fitted to the front end section of a main spindle S supported by a head stock H. More over, a tool holder Ta is fixed to a turret Th which is fitted to the front face of a tool rest Tr under a dividable condition and a touch sensor Ts is fitted to the holder Ta under an insertable and removable condition. The sensor Ts is always forced forward by a spring Sp and, when the tool rest Tr moves, the sensors Ts touches the end face of the work W or clicks D and the rear end of the sensor Ts is contacted with a limit switch Ls, and thus, the moved position is detected. In addition, whenever the sensor Ts or edge of each tool touches a preset sensor Ps, coordinate values from the origin OM are detected and correcting values for each tool are obtained.

Description

[Detailed Description of the Invention] (1) Industrial Field of Application The present invention relates to the setting of the coordinate system of a machine tool based on the position from the workpiece mounting surface when machining a burr with a machine tool, particularly a turning machine. Regarding equipment.

(2) Conventional technology Conventionally, NC processing machines for machine tools have two coordinates: one for machine control and one for machining the workpiece. The change in the workpiece mounting position was manually corrected.

(3) Problems to be Solved by the Invention However, the conventional manual correction described above requires measurement operations and manual calculations, and is accompanied by more complicated mechanical operations. This has resulted in problems such as malfunctions, prolongation of setup time, and occurrence of defective products.

Another problem in automation is that the program origin itself varies with respect to the machine origin depending on which point on the workpiece the operator uses as a reference (program origin) to create the cannibal program, and the machining allowance and its distribution prior to machining. It remained as a dot.

(4) Purpose The purpose of the present invention is to measure the position of the mounting surface of the workpiece W using a measuring means on the turret side and to measure the position of the mounting surface of the workpiece W in view of the above-mentioned circumstances. An object of the present invention is to provide a coordinate system setting device for a machine tool that allows automatic and easy operation by setting a coordinate system.

(5) Means and action for solving the problem The present invention is an improvement of a coordinate system setting device for a machine tool, and a measuring means attached to the tool rest side measures the position of the workpiece mounting surface and moves it along the machine tool program. This system automatically sets the coordinate system based on the specified coordinate system and performs the specified turning process on the workpiece.

That is, the present invention provides a chuck that is attached to the main shaft of a headstock and has claws for gripping a workpiece, a tool rest that is movable in two orthogonal planes in order to process the workpiece gripped by the chuck, and the tool. a measuring means attached to the base; a position detecting means for detecting the amount of movement of the tool post based on a signal from the measuring means; a means for setting a reference length of the measuring means; means for determining whether the workpiece is on the surface; input means for setting the length of the workpiece, machining allowance and whether the program origin is the work reference on the jaw side or the work reference on the turret side; and input settings for each of the input means. and calculation means for calculating coordinate system setting values based on the coordinate system setting values.

By employing the coordinate system setting device of the present invention, correction can be easily performed automatically, rather than manually.

(6) Example Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 is a schematic configuration diagram for explaining the coordinate system setting device of the present invention. In FIG. 1, a chuck C is attached to the tip of a main spindle S that is supported on a headstock H. The workpiece W is gripped by the claw at the tip of the chuck C. It has a machine origin of 0.4 on the side facing the chuck C. Further, a tool rest T is provided on the side facing the acid chuck C, and is movable within two planes of the X axis and the Z axis.

A turret Th is attached to the front of the tool post T1 so as to be indexable. A tool holder T is fixed to the turret T1, and a touch sensor T used in the apparatus of the present invention, which will be described in detail later, is removably attached to the tool holder T. The touch sensor T is always energized by the front hesp II ring S, and a high precision limit switch L is attached to the tool rest Tr. When the touch sensor T comes into contact with the end face of the workpiece W or the end face of the claw when the turret T moves, the moving position is detected every time the rear end touch switch L of the touch sensor T is touched. It looks like this.

Furthermore, correction of each tool can also be determined using this touch sensor T. As a means for detecting the correction value, that is, the installation deviation value, of the tool cutting edge, an automatic detection and output means called a tool precenter, as disclosed in Utility Application No. 171627/1980, filed by the same applicant, has recently been used. ing. This is equipped with two-way preset sensors P for the X and Z axes at the tip of an arm L that is swingably attached to the headstock H of a machine tool.The arm L has a detection position and a standby position. However, when the detection position is reached, as shown in Fig. 1 (the preset sensor P, the relative position from the machine origin OH is always constant, and parameters can be input. The configuration is such that detection can be performed in a total of four directions, two directions along the Z axis and two directions along the X axis.In FIG. 1, only the parameter value Z0 in the +2 axis direction is shown.

A correction value for each tool can be obtained by bringing the touch sensor T or the cutting edge of each tool into contact with the preset sensor P and detecting the coordinate value from the machine origin ON each time.

In other words, the set length of the touch sensor that is the measuring means is Z
P, the amount of movement of the turret T from the machine origin OH to the preset sensor P for each tool is Z, l, then the correction value Z for each tool. Fn-(ZQ-ZF)-Z.

It can be found by Therefore, in the present invention, the coordinate system setting values are determined, and the correction values for each tool are also determined. In addition, Z in Figure 1. is the length of the work material W, and δ is the amount of the work material W collected.

Next, a specific example of the present invention will be described.

Here, when calculating the coordinate system settings from the machine origin OH to the program origin, do you want to detect the position by applying the touch sensor T3 to the end face of the claw or the end face of the workpiece?
Whether the program origin reference is the end face of the jaw or the end face of the workpiece is a matter of discretion in each case, and the same applies to the addition of the removal amount δ, and the coordinate system settings are machine-specific. However, it varies, so flexible settings are required for automatic design. (A) to ()l in Figure 2
) is Z by the touch sensor T3 in FIG.
These are various application examples when determining coordinate system setting values in the axial direction. That is, the difference in whether the detection point of the touch sensor T is the workpiece end face or the claw end face, and the program origin 0.
Eight examples are shown, depending on whether is the claw end face or the workpiece end face, and whether or not there is a removal amount δ (i.e., whether it is the first process or the second process). It is something that Note that the preset sensor P is already at the standby position.

(A) FIG. 2 (A) is an example in which the detection point of the touch sensor TS is the end face of the workpiece, the program origin O2 is at the end face of the claw, and there is no amount of scraping δ.

First, as a temporary coordinate system setting value 20', Z0'*zp
+z14 is determined, and then the true coordinate system setting value Z is determined by the program origin O7. is, Zo = Zo' +2%1 (=ZP ”Zs +
Zin).

However, 20': Temporary coordinate system setting value ZP: Setting length Z of the touch sensor T,: Movement amount of the tool post from the machine origin 0.1 Z0: True coordinate system setting value Zo: Length of the workpiece material In other words, since Z, , Z, and 4 have been previously determined and input, the true coordinate system settings can be determined by determining only the amount of movement of the tool rest, Z and 4.

(B) FIG. 2(B) is an example in which the detection point of the touch sensor TS is the end face of the workpiece, the program origin 02 is at the end face of the claw, and there is a scraping amount δ.

The temporary coordinate system setting value z01 is ZO' = ZF + Z11
Therefore, the program origin is 0. The true coordinate system setting value Z by
0 is ZO=RZo' +zw+δ(=ZF +Zs +Z
w+δ).

Therefore, the true coordinate system setting value Z is obtained by adding the amount of conversion δ. is as if the workpiece W were at the position of the two-point class vA (imaginary line) in FIG. 2(B).

As in (A) above, since Zp, Zw, and δ have been determined and input in advance, the true coordinate system setting value Z0 can be determined by determining only the movement Bzi of the tool rest.

(C) An example in which the detection point of the touch sensor TS is on the workpiece end face, the program origin is also on the workpiece end face, and there is no scraping amount δ is as shown in FIG. 2(C).

The temporary coordinate system setting value 20' is zo'=ZP +2
M, and the true coordinate system setting value Z0 based on the program origin Or can be found by Zo = Zo' (=ZP +Z,).

(D) An example in which the detection point of the touch sensor TS is on the workpiece end face, the program origin is on the workpiece end face as in (C) above, and there is a pick-up amount δ is shown in Fig. 2 (D). That's right.

Temporary coordinate system setting value Z. ' becomes 2゜'=ZP+Xi,
The true coordinate system setting value z0 based on the program origin O1 is
Zo=Zo'+δ (=ZP''ZM+δ).

(E) The detection point of the touch sensor TS is the nail end surface,
Program origin 0. An example of a case in which there is also an amount δ on the end face of the nail and there is no removal amount δ is as shown in FIG. 2(E).

The temporary coordinate system setting value 20' becomes ZO' = zp + z, and the program origin is 0. The true coordinate system setting value Z0 is obtained by Zo = Zo' (=ZP +2M).

CF) The detection point of the touch sensor TS is the nail end surface,
The program origin O7 is also the claw end face, and an example where there is a machining allowance ■δ is the provisional coordinate system setting value Z as shown in FIG. 2(F). ' is Zo' ” Zr +
Zwi, and the true coordinate system setting value Z0 based on the program origin OF is determined by Zo''Zo'+δ (=ZP +2M +δ).

CG) The detection point of the touch sensor TS is the nail end surface,
An example where the program origin OF is on the end face of the workpiece and there is no machining allowance δ is as shown in FIG. 2(G).

The temporary coordinate system setting value Zo' is ZO'xzp +2M
Therefore, the true coordinate system setting value Z based on the program origin 02
. is Zo "Zo ' Zw ("ZP +2M -Z
w).

(H) The detection point of the touch sensor TS is the nail end surface,
An example in which the program origin O2 is at the end face of the workpiece and there is an amount of scraping δ is as shown in (11) in FIG.

The temporary coordinate system setting value 2°' is Z0' x 7. , 4Zs
Therefore, the program origin is 0. The true coordinate system setting value Z by
0 is Zo −Zo 'Zw+δ(=ZP +2M Z
H+δ).

If we summarize the true coordinate system settings Z0 of (A) to (H) mentioned above, we get Zo・Z, +ZH4Z, etc. Example (^)
In the case of Zo= Zwi ZM+ Zw+δ... In the case of example (8), Z0・Z, +ZN...
・For examples (C) and (E), Zll-ZP+ZM+
6... For example (D) and (F), Z0・Z
, +Z, -Z, +δ... In case of example (H), Z0・ZP
+Zs -Zw... This is the case of example (G).

These 20 values are plus the workpiece length Zl.

``Finus, if we also take into consideration that the value of the amount of conversion δ is 0, the general solution is Zo = Zr + Zn + Zw + δ.

FIG. 3 is a block diagram showing an example of a coordinate system setting device embodying the present invention. In FIG. 3, NC data is input by a CPU 100 from a tape reader l for reading NC data via its input circuit 1a, and is temporarily stored in a nibcogram memory 6.

Work length Z5. The values of the set length Zp of the touch sensor T and the amount of pick-up δ of the workpiece W to be machined are set in advance, and the respective workpiece lengths are input from the keyboard 2 with a screen, which is an input means, via the input circuit 2a. SaZ. , the memory 8 for the set length ZP of the touch sensor, and the memory 9 for the amount of pick-up δ of the workpiece W to be machined.

The touch sensor TS is brought into contact with the end surface of the work W or the end surface of the claw to measure the amount of movement ZM of the cutter T, and the amount of movement Z9 is inputted via the input/output circuit 3.

The position Z of the preset sensor P from the mechanical origin OM is measured and filed in the preset sensor position setting data 34.

Furthermore, the position data Z from the machine origin O14 corresponding to the movement of the tool rest is sent out from the position data sending means 5. of,
The coordinate value data Za is transferred to the memory 11.

Workpiece length Z processed and stored by CPU 100
w, machining allowance data δ, touch sensor setting length Z, and coordinate value data Z, are taken into the calculation means 12 in the following order and are subjected to calculation processing.

First, the touch sensor T3 emits a touch sensor signal when the end surface of the nail touches the end surface of the workpiece, and the coordinate value data Z, stored in the memory 11 by this touch sensor signal passes through the seventh gate 13. , are taken in as sensor coordinate values Z7 and stored in the sensor coordinate value memory 14.

(ZM = zn) The touch sensor setting length Z stored in the memory 8 and the sensor coordinate value ZM stored in the memory 14 are calculated by the calculation unit 1.
5, Zo'=ZrZ, (7) temporary coordinate system setting value z01 is calculated.

The temporary coordinate system setting value z01 calculated by the calculation unit 15 is changed to the temporary coordinate system setting value Z by closing the AND gate 16 when the workpiece edge touch signal is taken into the AND gate 16.

′ is passed. Also, when the claw end surface reference program signal is taken into the AND gate 18, the temporary coordinate system setting value 2
0' passes through the AND gate 18 and is taken into the arithmetic unit 22.

On the other hand, the temporary coordinate system setting value 20' passed through the AND gate 16 becomes the temporary coordinate system setting value 20' when the workpiece end face reference program signal is taken into the AND gate 19.
' passes through the AND gate 19 and passes through the OR gate 23.

In addition, the temporary coordinate system setting value 2 calculated by the calculation unit 15
0', when the claw end face touch signal is taken into the AND gate 17, the provisional coordinate system setting value 20' passes through the AND gate 17. The temporary coordinate system setting value Z01 is set to
0 and passes through the OR gate 23.

Temporary coordinate system setting value 20 that passed through AND gate 17
When the workpiece end face reference program signal is taken into the AND gate 21, the provisional coordinate system set value Zo' passes through the AND gate 21 and is taken into the calculation section 24.

In the arithmetic unit 22, the temporary coordinate system setting value Z that has passed through the AND game) 18 is taken in. ' and the workpiece length Zw stored in the workpiece length 28 memory 7 are imported,
The calculation process ZI-Zo'+Zw is performed, and the calculated value ZI passes through the OR gate 25. The temporary coordinate system setting value 20' that has passed through the AND gate 19 or 20 is Zr-Zo' because it passes through the AND gate 19 or 20 as it is, and in this case is ZW-O. ), the value of Zl passes through the OR gate 25.

In the calculation section 24, the temporary coordinate system setting value 20' that has passed through the AND gate 21 and the workpiece length 2 are calculated.
The workpiece length Z- stored in the memory 7 is taken in, the calculation process of ZI -Zo'-Zw is performed, and the calculated value Z1 passes through the OR gate 25.

The ZlO value that has passed through the OR gate 25 becomes ZlO when the signal representing the machining allowance data is taken into the AND gate
The value of is passed through the AND gate 26 and taken into the calculation unit 28, and the machining allowance data δ stored in the machining allowance data δ/memory 9 is also taken into the calculation unit 28. The arithmetic unit 28 performs arithmetic processing of Zo''ZI +δ.

The value of ZI that has passed through the OR gate 25 passes through the AND gate 27 and is taken into the arithmetic unit 29 as it is when the signal indicating no data to be retrieved is taken into the AND gate 27 . In the calculation unit 29, since there is no machining allowance data δ, Z
o”ZI. The value of Zo processed by the calculation unit 28 or 29 is assigned to the OR gate 3.
0, and the true coordinate system data Zo is stored in the memory 31 as the true coordinate system setting data Z0. Furthermore, the true coordinate system setting data Z is stored in the memory 31. Canadian program
Store in memory.

Next, correction of each tool used to process the workpiece W will be explained.

The coordinate value (setting data) Zo from the machine origin OM for +Z in the precent position setting data 34 is filed in the precent position setting data 34.

As will be described later, this example only explains how to use setting data Z0 for +Z to obtain correction values for each tool, but in reality, setting data for -Z, +X, and =X are also filed and used. However, since these explanations are the same as for +Z, they will be omitted.

Due to the movement of the tool rest, the tool moves to the + position of the preset sensor P.
Upon contact with the Z sensor, the preset sensor P3 takes in the +Z preset sensor signal to the AND gate 32. With this signal, the coordinate value data Zn stored in the coordinate value data memory 11 of the tool post at that time passes through the AND gate 32 and is taken into the calculation section 33. The calculation unit 33 takes in the touch sensor setting length Z, the touch sensor setting length Z stored in the memory 8, and obtains the preset sensor setting data Z0 from the precent position setting data file 34. Import the preset sensor setting data Z.

In the calculation unit 33, Zov-= (ZQ ZP ) −
2 is performed, and Z is stored in the correction data memory 35 from the calculation section 33. A file is filed for each tool in Section F. Similarly, although the explanation is omitted, the X axis is also corrected. Filed in Section F.

The R term in the correction data memory 35 indicates the sharpness by the blade edge radius, and the T term is the identification number of the blade edge position of the touch sensor.

Correction data Z OF from tool correction data memory 35
Coordinate system setting and tool correction are performed by sending n to the cutting program memory 6, and turning is performed according to the cutting program.

The operation of the present invention will be explained based on the flowchart of FIG. In FIG. 4, first, as the 0th stage, the touch sensor T is brought into contact with the preset sensor P, and the setting data ZQ of the preset sensor ps is inputted and filed in the preset sensor position setting data file 34. The set length Z of the touch sensor P, which is preset as the 0th stage, is transferred from the keyboard with screen 2 to the input/output circuit 2.
It is stored in the memory 8 via a.

The coordinate system setting mode is selected as the 0th stage, and subsequent coordinate system settings are performed. At the 0th stage, the tool rest T is moved and the touch sensor T is applied to the end face of the claw or the end face of the workpiece. When the touch sensor T hits the end face of the claw or the end face of the workpiece, the movement of the tool rest T automatically stops at the 0th stage. Then the 0th
As a step, the touch sensor signal is taken into the AND gate 13, so the coordinate value data Zn is input to the AND gate 1.
3, enters the calculation unit 14, and calculates the sensor coordinate value L-z,
After processing, the sensor coordinate value 2.4 enters the calculation unit 15, and the touch sensor setting length ZP from the memory 8 enters the calculation unit 15, and the temporary coordinate system setting value Zo'
"ZF + 2J1 calculation processing is performed.

As the 0th stage, it is determined based on the signal whether the detection point of the touch sensor is the end face of the claw or the end face of the workpiece, and if it is the end face of the claw, in step
It is determined whether the claw end face is referenced, and if the workpiece end face is referenced, the calculation unit 24 calculates Z+ =Zo 'Z as the 0th stage.
Arithmetic processing of w is performed. That is, a temporary coordinate system setting value 20' is taken into the AND gate 17 by the claw end face touch signal from the calculation unit 15, and the temporary coordinate system setting value 2
0' passes through the AND gate 17, and furthermore, a temporary coordinate system setting (pZ
o' passes through the AND gate 21 and is taken into the calculation section 24, and the workpiece length Z- is taken into the calculation section 24 from the memory 7, thereby obtaining the above-mentioned Z+ -Zo'.
Zw calculation processing is performed.

When it is determined that the claw end surface is the reference in the 0th stage, the process moves to the [phase] stage, passes through the OR gate 23, and is taken in as Z+"Zo".In other words, the temporary coordinates that have passed through the AND gate 17 The system setting value 20' passes through the AND gate 2° according to the claw end surface reference program signal, and Z+=Zo'
Pass through OR Gate 23 as follows.

If the detection point of the touch sensor is the workpiece end face in the 0th stage, it is further determined in the 0th stage whether the program origin is based on the workpiece end face or the claw end face, and if it is determined that it is the workpiece end face reference, Similarly to the [phase] stage, Z+ = Zo'
processing is performed. That is, the temporary coordinate value 20' calculated by the calculation unit 15 passes through the AND gate 16 in response to the workpiece end surface touch signal. Furthermore, by inputting the workpiece end face reference program signal into the AND gate 19, the provisional coordinate system setting value 20' passes through the AND gate 19 and is output to the OR gate 23 as Z+=Zo'.
pass through.

When the program origin is determined to be the claw end surface reference in the 0th stage, the calculation process of Z + "Zo ' + 2w is performed in the 0th stage. In other words, the temporary coordinate system setting value Z0 ' that has passed through the AND gate 16 is The end face reference program signal passes through the AND gate 18 and is taken into the calculation section 22.The calculation section 22 takes in the workpiece length Z from the memory 7, and the calculation processing of Z1=ZO'+Zk is performed in the calculation section 22. Te is called.

Arithmetic unit 22. The value of Ha that has passed through the OR gate 23 and the arithmetic unit 24 passes through the OR gate 25.

Next, it is determined whether the workpiece W to be machined in the 0th stage has a machining substitute or not. If there is a removal substitution δ, in the [phase] stage, 20-2. +6 calculation processing is performed. That is, the value of ZI that has passed through the OR gate 25 passes through the AND gate 26 and is taken into the arithmetic unit 28 by the signal indicating that there is data to be substituted, and furthermore, the memory 9 causes the value of substitution δ to be taken into the arithmetic unit 28. Te, Zo-ZI +
The arithmetic processing of δ is performed, passes through the OR gate 30, and is stored in the coordinate system setting data memory 31.

If there is no replacement in the 0th stage, 2 in the [phase] stage,
=2. Assignment processing is performed. The value of Z, which has passed through the OR gate 25, is passed through the AND gate 27 by the signal indicating no data, and is substituted with Zo''ZI in the arithmetic unit 29, and then passed through the OR gate 30 and stored in the memory. 3
] is the true coordinate system setting value Z. is temporarily stored in the coordinate system setting data 31.

When the coordinate system setting is completed up to the 0th stage, the tool rest T is returned to the origin in the [phase]. Touch sensor T at stage 0,
Remove the tool from the turret, and install the tool at this location, if any.

Next, the tool correction mode is selected in the 0th stage, and the tool correction operation is started in the 0th stage. In other words, plisse.

Transfer the sensor P from the headstock H and set it, and find the correction value for each tool. Z in the [phase] stage. r,,=(z.

ZP) Performs arithmetic processing of z. In other words, memory 11
The coordinate value data Z1 at , passes through the AND gate 32 and is taken into the arithmetic unit 33 by the +Z recent sensor signal. Furthermore, the touch sensor setting length Z is input to the calculation unit 33 from the memory 8.

By respectively importing the preset sensor setting lengths Zo from the memory 10, ZOF-=(Z.

-ZP)-z, and performs the calculation process to correct the tool in Hz. , is determined and stored in the correction data memory 35.

At the 0th stage, the normal mode is selected, and at the 0th stage, the cannibal program is taken out from the cannibal program memory 6 and predetermined processing is performed with the machine tool.

In the embodiment of the present invention, a touch sensor was attached to the tool post to obtain the coordinate system setting values, but the sensor was placed on the fixed side of the headstock, and the touch sensor was installed on the workpiece or chuck jaw, and the touch sensor was attached to the tool post to determine the coordinate system settings. There is no problem even if a closed circuit is formed the moment the reference piece comes into conductive contact with the reference piece, and the coordinate system set value is determined by detecting the t-magnetic induction flowing in the closed circuit.

(7) Effects As explained above, according to the present invention, by measuring the position on the workpiece W mounting surface side using the measuring means on the turret side,
This is a coordinate system setting device for a machine tool that calculates true coordinate system setting values with a calculation means and can easily and automatically set workpiece machining from a program origin, and can be accurately and easily controlled. Therefore, it contributes to improved precision, automation, and efficiency in machining operations without causing malfunctions.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram for explaining the coordinate system setting device of the present invention. FIGS. 2A to 2H are views of an embodiment in which the detection location of the touch sensor T, the position of the program origin, and the presence or absence of replacement in FIG. 1 are changed. FIG. 3 is a configuration block diagram showing an example of a coordinate system setting device embodying the present invention. FIG. 4 is a flowchart for explaining the present invention in detail. H... Headstock S... Spindle C... Chuck D... Jaw 0i... Machine origin
O7...Program origin T,...Turret
T,...Turret T,...Touch sensor PS・
・・Preset sensor ・・Limit switch
...Arm ZP...Length of touch sensor Z...Length of workpiece material δ...Mapping allowance ZH
...Amount of movement of the turret Zo...Amount of movement of the preset sensor Z0...True coordinate system setting value Zo'...Temporary coordinate system setting value 2. ...Touch sensor length 100...CPU
12... Calculating means 15, 22.28...
Arithmetic Division Figure 1 (A) (C) (D) (G) Figure 2 ,,) (H) Procedural Correction W (Voluntary) February 1985 (Patent Office Examiner) 1. Incident Display of Japanese Patent Application No. 232564-2, 1982,
Title of the invention Coordinate system setting device for machine tools 3, relationship with the case of the person making the amendment Applicant address 2-4-1, Marunouchi, Chiyoda-ku, Tokyo Name Hitachi Seiki Co., Ltd. Representative 4, Agent 6, Contents of amendment 111 The full text of the specification will be corrected as shown in the attached sheet. (2) Among the drawings, Figures 1, 2 (^) to (H), and 3 will be corrected as shown in the attached sheet. Full text correction statement 1, Title of the invention Coordinate system setting device for machine tool 2, Claims A chuck attached to the main shaft of a headstock and having claws for gripping a workpiece, and machining the workpiece gripped by the chuck A turret movable in two orthogonal planes, a measuring means attached to the turret, a position detecting means for detecting the amount of movement of the turret based on a signal from the measuring means, and a reference length of the measuring means. A means for setting the height, a means for determining whether the detection point of the measuring means is the surface of the jaw is the surface of the workpiece, and a means for determining whether the detection point of the measuring means is the surface of the jaw or the surface of the workpiece. Coordinate system setting device 3 for a machine tool, characterized in that it comprises an input means for setting whether it is a work reference, and a calculation means for calculating coordinate system setting values based on the input settings of each of the input means. Description +11 Field of Industrial Application The present invention relates to a coordinate system setting device for a machine tool, in particular, a coordinate system setting device for a machine tool, which is based on the position from the work mounting surface side when processing the work with a turning machine. (2) Conventional technology Conventionally, NC processing machines for machine tools have two coordinates: one for machine control and one for machining the workpiece. Changes in workpiece mounting position were corrected manually. (3) Problems to be Solved by the Invention However, the conventional manual correction described above requires measurement operations and manual calculations, and is accompanied by more complicated mechanical operations. This has resulted in problems such as malfunctions, prolongation of setup time, and occurrence of defective products. In addition, the program origin itself may vary with respect to the machine origin depending on which point on the workpiece the operator uses as a reference (program origin) to create the cannibal program, and the machining allowance and its distribution prior to machining. This remained an issue with automation. (4) Purpose The purpose of the present invention was proposed in view of the above circumstances to solve the problem. To provide a coordinate system setting device for a machine tool that allows automatic and easy operation by setting a system. (5) Means and operation for solving the problem The present invention is an improvement of a coordinate system setting device for a machine tool, in which the position of the workpiece mounting surface is measured by a measuring means attached to the tool rest, and the position is adjusted along the machine tool program. This system automatically sets the coordinate system based on the specified coordinate system and performs the specified turning process on the workpiece. That is, the present invention provides a chuck that is attached to the main shaft of a headstock and has claws for gripping a workpiece, a tool rest that is movable in two orthogonal planes in order to process the workpiece gripped by the chuck, and the tool. a measuring means attached to the base; a position detecting means for detecting the amount of movement of the tool post based on a signal from the measuring means; a means for setting a reference length of the measuring means; means for determining whether the work is on the surface; input means for setting the length of the work, the amount of machining allowance, and whether the program origin is the work reference on the jaw side or the work reference on the turret side; and input settings for each of the input means. and calculation means for calculating coordinate system setting values based on the coordinate system setting values. By employing the coordinate system setting device of the present invention, correction can be performed manually (correction can be performed automatically and easily. (6) Examples Hereinafter, one embodiment of the present invention will be described. will be explained in detail based on the drawings. Fig. 1 is a schematic configuration diagram for explaining the coordinate system setting device of the present invention. In Fig. 1, the tip of the spindle S supported on the headstock H is shown. A chuck C is attached to the chuck C. A workpiece W is gripped by the claw at the tip of the chuck C. The machine origin is 0.4 on the side facing the chuck C. A turret T is provided on the side where the turret is moved, and is movable in two planes, the X-axis and the Z-axis.A turret T is attached to the front of the turret Tr so that it can be indexed. A tool holder T1 is fixed to the turret Th, and a touch sensor T used in the device of the present invention, which will be described in detail later, is removably attached to the tool holder T1.The touch sensor T is always attached to the front. Spring S
, and a high-precision limit switch L is attached to the tool rest Tr. When the touch sensor T comes into contact with the end face of the workpiece W or the end face of the claw due to the movement of the tool rest Tr, the rear end of the touch sensor T touches the limit switch L, so that the moving position is detected. It has become. Furthermore, correction of each tool can also be determined using this touch sensor T. As a means for detecting the correction value of the tool cutting edge, that is, the installation deviation value, an automatic detection means called a toolburi-nanatsuta, as disclosed in Utility Application No. 171627-1980, filed by the same applicant, has recently been used. . This is equipped with two-way preset sensors P for each of the X and Z axes at the tip of an arm L that is swingably attached to the headstock H of a machine tool. As shown in FIG. 1, when the sensor P reaches the detection position, the relative position from the machine origin OM is always constant, and parameters can be input. This preset sensor P is 2 on the Z axis.
It has a configuration that allows detection in a total of four directions: the direction and the X-axis. In FIG. 1, only the parameter value Z0 in the +Z-axis direction is shown. A correction value for each tool can be obtained by bringing the touch sensor T or the cutting edge of each tool into contact with the preset sensor P and detecting the coordinate value from the machine origin 08 each time. That is, if the set length of the touch sensor T, which is the measuring means, is Zp, and the amount of movement of the tool rest T1 from the machine origin 08 to the preset sensor P for each tool is 21, then the correction value for each tool is Zo, . It can be determined by 1-(ZQ ZF)-Z-. Therefore, in the present invention, the coordinate system setting values are determined, and the correction values for each tool are also determined. In addition, in FIG. 1, Zw is the length of the work material W, and δ is the removal position of the work material W. Next, a specific example of the present invention will be described. Here, the machine origin is 0. When calculating the coordinate system setting values from to the program origin, do you want to detect the position by placing the touch sensor T on the end face of the claw or the workpiece end face?
Whether the program origin reference is the end face of the jaw or the end face of the workpiece is a matter of discretion each time, and the same applies to the addition of the machining allowance δ; the coordinate system settings are not unique to the machine. Since the settings do not change and vary, flexible settings are required for automatic settings. (A) to (H) in Figure 2
These are various general examples when determining the coordinate system set value in the Z-axis direction using the touch sensor Ts in FIG. 1 described above. In other words, there are differences in whether the detection point of the touch sensor T is the workpiece end face or the claw end face, the difference in whether the program origin OF is the claw end face or the workpiece end face, and whether or not there is a machining allowance δ (i.e. , the first step or the second step), eight examples are shown. Note that the preset sensor P is already at the standby position. (A) FIG. 2 (A) is an example in which the detection point of the touch sensor T is on the end face of the workpiece, the program origin O7 is on the end face of the claw, and there is no machining allowance δ. First, as a temporary coordinate system setting value 20', z 01-2
p + Z M is calculated, and then the true coordinate system setting value Z0 based on the program origin O7 is as follows: Zo = Zo' +2w (-ZP +ZH+2w
). 20': Temporary coordinate system setting value Z,: Setting length Z of touch sensor T, 4 = Movement amount of the tool post from the machine origin 0° Zo: True coordinate system setting value Zw: Length of workpiece material That is, since Zp and Zw have been calculated and input in advance, the movement IZ of the tool rest. The true coordinate system setting values can be found by finding only . (B) FIG. 2(B) is an example in which the detection point of the touch sensor T is on the end face of the workpiece, the program origin O1 is on the end face of the claw, and there is a machining allowance δ. The temporary coordinate system setting value Z0 ′ is Zo ′ −ZP +
Zllll, and the program origin is 0. The true coordinate system setting value z0 is as follows: ZO=Zo' +Zw+δ(=ZP +Z, +Zw
+δ). Therefore, the true coordinate system set value Z0 obtained by adding the replacement positions δ is as if the workpiece W were at the position indicated by the chain double-dashed line (imaginary line) in FIG. 2(B). As in (A) above, since Zp, Zw, and δ have been determined and inputted in advance, the true coordinate system setting value Z0 can be determined by determining only the movement IZ of the tool rest. (C) An example where the detection point of the touch sensor T is on the end face of the workpiece, the program origin is also on the end face of the workpiece, and there is no machining substitution δ is the same as shown in FIG. 2(C). The temporary coordinate system setting value 20' is zo l = z, +Zi, and the program origin is 0. The true coordinate system setting value Z by
0 is obtained by Zo ``Z6 ' (-ZP + 2M). (D) The detection point of the touch sensor TS is the workpiece end face, the program origin is at the workpiece end face as in (C) above, and there is no machining allowance. An example when there is δ is as shown in Figure 2 (D). The temporary coordinate system setting value 20' is Zo' -ZP +2
M, and the true coordinate system setting value z0 based on the program origin 0 can be found as Zo=Zo'+δ (=ZP"Zll+δ). (E) The detection point of the touch sensor T is the nail end surface,
An example where the program origin O2 is also on the claw end face and there is no machining allowance δ is as shown in FIG. 2(E). The temporary coordinate system setting value Zo' is zo' = ZP +
2M, and the true coordinate system setting value Z0 based on the program origin O1 is obtained by Zo "Zo ' (=ZP + Z?I). (F) The detection point of the touch sensor T is the nail end surface,
The program origin OF is also the claw end face, and an example where there is a machining displacement δ is as shown in (F) in Figure 2. The temporary coordinate system setting values z and l are ZO' = ZF + Z
ll, and the true coordinate system setting depending on the program origin (
j! zo is determined by z,=Z,'+δ ("ZP+ZM +δ). (G) The detection point of the touch sensor T is the nail end surface,
An example where the program origin O1 is on the end face of the workpiece and there is no machining allowance δ is as shown in FIG. 2(G). Temporary (7) Locus [System setting value Z. ′ is Z6 ′ −Zp
+ZN, and the program origin is 0. The true coordinate system setting value Z by. is, Zo = Zo' -Zt, + (-ZP +Z!
4-zw). (H) The detection point of the touch sensor T is the nail end surface,
Program origin 0. is on the end face of the workpiece and there is a machining allowance δ as shown in ()l) of FIG. Temporary coordinate system setting value Z. ' is Z O' = Z P 4Z
8, which is the true coordinate system setting value Z based on the program origin 02. is Zo−Zo' Zw+δ(−ZP ” ZM Zw
+δ). To summarize the true coordinate system setting value Z0 of (A) to ()l) mentioned above, Z, ・Zp+ZM+Zv1...Example (A
), then Zo □ Zr + ZM + Zw + 6
... In case of example (B), Z0・Z, +Z, ...
・・・・・・Example/C) In case of (E), Zo=L
+L÷δ・・・Example ([1), (F) Zo・Zr÷Zs−Zw δ・・・Example (I()
In the case of Z0・Zp+Z, -Zw...Example (G) is the case. These 20 values are plus the workpiece length Z8. Considering that the value of the minus machining allowance ■δ is O, the general solution is Zo = ZP + ZN + Zw + δ. FIG. 3 is a block diagram showing an example of a coordinate system setting device embodying the present invention. In FIG. 3, NC data is inputted by a CPU 100 from a tape reader 1 that reads NC data via its input circuit 1a, and is temporarily stored and stored in a computer program memory 6. Work length Zw, The set length Z of the touch sensor T and the value of the amount δ of the workpiece W to be machined are set in advance, and the respective values are input from the keyboard 2 with a screen, which is an input means, through the input/output circuit 2a. It is temporarily stored in the memory 7 of the workpiece length Zw, the memory 8 of the set length Z of the touch sensor, and the memory 9 of the pick-up amount δ of the workpiece W to be machined. By contacting the end face, the movement amount 2 of the tool rest T is measured, and the movement amount 2 is inputted via the input/output circuit 3. Position Z0 of the preset sensor P from the machine origin Oi is measured and filed in the preset sensor position setting data 34.Furthermore, the position data Z0 from the machine origin O8 corresponding to the movement of the tool post is sent from the position data sending means 5 to the memory 11 of the coordinate value data Zfi. Transfer. Workpiece length Z processed by CPU 100 and stored respectively, 4. Machining allowance data δ, touch sensor setting length Z2
and coordinate value data Z0 are taken into the calculation means 12 in the following order and are subjected to calculation processing. First, the touch sensor T emits a touch sensor signal when the end surface of the nail touches the end surface of the workpiece, and the coordinate value data Z7 stored in the memory 11 by this touch sensor signal passes through the AND gate 13. The sensor coordinate value Z1 is taken in and stored in the sensor coordinate value memory 14. (ZM = Z, ,) The touch sensor setting length Z stored in the memory 8 and the sensor coordinate value 2 stored in the memory 14 are calculated by the calculation unit 1.
5, a temporary coordinate system setting value 20' of Zo ``''ZP+ZH is calculated. The temporary coordinate system setting value z01 calculated by the calculation unit 15 is changed to the temporary coordinate system setting value 20 by closing the AND gate 16 when the workpiece edge touch signal is taken into the AND gate 16.
′ is passed. Further, when the claw end surface reference program signal is taken into the AND gate 18, a temporary coordinate system setting value 20' is passed through the AND gate 18 and taken into the calculation section 22. On the other hand, the temporary coordinate system setting value 20' passed through the AND gate 16 becomes the temporary coordinate system setting value 20' when the workpiece end face reference program signal is taken into the AND gate 19.
' passes through the AND gate 19 and passes through the OR gate 23. In addition, the temporary coordinate system setting value Z calculated by the calculation unit 15
. ′ passes through the AND gate 17 when the claw end face touch signal is taken in, and the temporary coordinate system set value 70 ′ passes through the AND gate 17 . The temporary coordinate system setting value 20' becomes the temporary coordinate system setting value Z when the claw end surface reference program signal is taken into the AND gate 20. ' is and gate 20
and pass through the or gate 23. Temporary coordinate system setting value 20 that passed through AND gate 17
When the workpiece end face reference program signal is taken into the AND gate 21, a temporary coordinate system setting value 70' passes through the AND gate 21 and is taken into the calculation section 24. In the calculation section 22, the temporary coordinate system setting value 20' taken in through the AND gate 18 and the workpiece length Z are calculated. The workpiece length Zl stored in the memory 7 is taken in, the calculation process of Zl - Zo' +2w is performed, and the calculated value Z1 passes through the OR gate 25. The temporary coordinate system setting value 20' that has passed through the AND gate 19 or the AND gate 20 passes through each as is, and in this case Zw''''O, so Zl is ``20''.), Z, the values of It passes through the OR gate 25. In the calculation section 24, the temporary coordinate system setting value Z.' taken in after passing through the AND gate 21 and the workpiece length Z8 stored in the workpiece length 28 memory 7 are calculated. is taken in,
The calculation process ZI=Zo'Zw is performed, and the calculated value ZI passes through the OR gate 25. The value of Z, which has passed through the OR gate 25, becomes
The value of is passed through the AND gate 26 and taken into the calculation unit 28, and the machining allowance data δ and the machining allowance data δ stored in the memory 9 are also taken into the calculation unit 28. In the calculation section 28, Z. The calculation process of =Z1 +δ is performed. The value of Zl that has passed through the OR gate 25 passes through the AND gate 27 when the signal indicating no data to be retrieved is taken in by the AND gate 27, and is taken into the arithmetic unit 29 as it is. In the calculation unit 29, since there is no machining allowance data δ, Z
o”Z+.The value of Zo processed in the calculation unit 28 or 29 is assigned to the OR gate 3.
0, and the true coordinate system data Z0 is stored in the memory 31 as the true coordinate system setting data Z0. Furthermore, the true coordinate system setting data Z0 is added to the program from the memory 31.
Stored in memory 6. Next, correction of each tool used to process the workpiece W will be explained. Mechanical origin O14 for +Z in preset sun 7P
The coordinate values (setting data) ZO from are stored in the preset position setting data 34. As will be described later, this example only explains how to use setting data Z0 for +Z to obtain correction values for each tool, but in reality, setting data for -Z, +X, and -X are also filed and used. However, since these explanations are the same as for +Z, they will be omitted. The tool is brissed due to the movement of the turret./) Sensor P3
When the +Z sensor is touched, the preset sensor P is +
The Briseft sensor signal for 2 is taken into the AND gate 32. With this signal, the coordinate value data Z7 in the coordinate value data memory 11 of the tool post at that time is input to the AND gate 3.
2 and is taken into the calculation section 33. The calculation unit 33 takes in the touch sensor setting length Z, the touch sensor setting length ZF stored in the memory 8, and obtains the preset sensor setting data Z from the preset position setting data file 34, and the touch sensor setting length ZF stored in the memory 10. Import the preset sensor setting data Z0. In the calculation unit 33, Zorn-(Za ZP)-Z
The arithmetic processing of o is performed, and the correction data/
Z in memory 35. A file is filed for each tool in Section 1. Similarly, although the explanation is omitted, the X axis is also corrected. Filed in Section F. The R term in the correction data memory 35 indicates the sharpness by the blade edge radius, and the T term is the identification number of the blade edge position of the touch sensor. Correction data Z OF from tool correction data memory 35
Coordinate system setting and tool correction are performed by sending n to the cutting program memory 6, and turning is performed according to the cutting program. The operation of the present invention will be explained based on the flowchart of FIG. In FIG. 4, the touch sensor T is first brought into contact with the preset sensor P as the 0th stage, and the setting data Zo of the preset sensor P is inputted and filed in the preset sensor position setting data file 34. The set length of the touch sensor P, which is preset as the 0th stage, is 2. from the keyboard with screen 2, input/output circuit 2
It is stored in the memory 8 via a. The coordinate system setting mode is selected as the 0th stage, and subsequent coordinate system settings are performed. At the 0th stage, the tool rest Tr is moved and the touch sensor T is applied to the end face of the claw or the end face of the workpiece. When the touch sensor T hits the end face of the claw or the end face of the workpiece, the movement of the tool rest T automatically stops at the 0th stage. Next, as the 0th stage, the touch sensor signal is taken into the AND gate 13, so the coordinate value data Zn passes through the AND gate 13, enters the calculation unit 14, and becomes the sensor coordinate value Zs.
``'Zfi processing is performed, the sensor coordinate value 2.4 enters the calculation unit 15, and the touch sensor setting length Z from the memory 8 enters the calculation unit 15, and the temporary coordinate system setting value The arithmetic processing of Zo' -Zr +Zs is performed. In the 0th stage, it is determined by the signal whether the detection point of the touch sensor is the end face of the claw or the end face of the workpiece. If it is the end face of the claw, the program origin is set in step 2. Is it based on the workpiece end face?
It is determined whether the claw end face is the reference, and if the workpiece end face is the reference, the arithmetic processing of z,=z,'-z,4 is performed in the arithmetic unit 24 as the 0th stage. That is, the temporary coordinate system setting value Z is determined by the calculation unit 15. ′ is and by the claw end surface touch signal.
The temporary coordinate system setting value z, 1 is taken into the gate 17 and passes through the AND gate 17, and further, the temporary coordinate system setting value 20' passes through the AND gate 21 according to the workpiece end face reference program signal. The above-mentioned Z+=Zo'Z is obtained by importing the workpiece length Zw into the calculation unit 24 and from the memory 7 into the calculation unit 24. calculation processing is performed. When it is determined that the claw end surface is the reference at the 0th stage, the process moves to the 0th stage, passes through the or gate 23, and 7. , -7. o,
' is imported as '. That is, AND gate 17
The temporary coordinate system setting value 20' that has passed through the AND gate 20 is passed through the claw end surface reference program signal, and Zl
It passes through the OR gate 23 as "ZO". If the detection point of the touch sensor at the 0th stage is the workpiece end face, then at the 0th stage it is further determined whether the program origin is based on the workpiece end face or the claw end face. If it is determined that the workpiece end face is the reference, ZI=Zo' is processed in the same way as in the [phase] stage.In other words, the temporary coordinate value 20' calculated by the calculation unit 15 is the workpiece end face touch signal. Then, by inputting the workpiece end face reference program signal into the AND gate 19, the temporary coordinate system setting value Z.' is passed through the AND gate 19.
and passes through the or gate 23 as Zl-Zo'. If the program origin is determined as the claw end surface reference in the 0th stage, 7. , -7.0' +7. , is performed. That is, the temporary coordinate system set value z01 that has passed through the AND gate 16 is passed through the AND gate 18 in response to the claw end surface reference program signal. and input it into the arithmetic unit 22. The calculation unit 22 has a memo IJ.
Work length Z from 7. Take in Z, -Zo'+Z
The arithmetic processing of w is performed in the arithmetic unit 22. Arithmetic unit 22. The value of Zl that has passed through the OR gate 23 and the calculation section 24 passes through the OR gate 25. Next, it is determined whether or not the workpiece W to be machined in the 0th stage has a scraped amount. If there is an amount δ of removal, the arithmetic processing of Zo−Zl+δ is performed in the [phase] stage. That is, the value of Zl that has passed through the OR gate 25 passes through the AND gate 26 and is taken into the arithmetic unit 28 by the signal indicating the presence of decoupled data, and furthermore, the memory 9 prevents the amount of decoupling δ from being taken into the arithmetic unit 28. te, Zo”Zl +δ
is processed, passes through the OR gate 30, and is stored in the coordinate system setting data memory 31. If there is no amount of carbonization in the 0th stage, Zo
”Z, assignment processing is performed. OR gate 25
The value of Z that has passed through is passed through the AND gate 27 by the signal indicating no converted data, the arithmetic unit 29 performs the assignment process of Zo=Zl, and the value of Z is passed through the OR gate 30 and stored in the memory 31 as the true value. Coordinate system setting value Z0 is coordinate system setting data 31
is stored once. When the coordinate system setting is completed up to the 0th stage, the tool rest T, , is returned to the origin in the [phase] stage. At the 0th stage, remove the touch sensor T from the tool rest, and if there is a tool at this position, install it. Next, the tool correction mode is selected in the 1st [phase] stage, and the tool correction operation is started in the 1st [phase] stage. That is, the preset sensor P is transferred and set from the headstock H, and the correction value for each tool is determined. Z in the [phase] stage. F--(ZQZP
)-Z, is calculated. That is, coordinate value data Z in memo I711. The +Z preset sensor signal passes through the AND gate 32 and is taken into the arithmetic unit 33. Furthermore, the touch sensor setting length ZP is input to the calculation unit 33 from the memory 8 . By loading each preset sensor setting length Zo from the memory 10, ZOFn-(Za-ZP)
- Perform arithmetic processing of zn and perform tool correction flzor. is determined and stored in the correction data memory 35. At the 0th stage, the normal mode is selected, and at the 0th stage, the cannibal program is taken out from the cannibal program memory 6 and predetermined processing is performed with the machine tool. In the embodiment of the present invention, a touch sensor was attached to the tool post to obtain the coordinate system setting values, but the sensor was placed on the fixed side of the headstock, and the touch sensor was installed on the workpiece or chuck jaw, and the touch sensor was attached to the tool post to determine the coordinate system settings. There is no problem even if a closed circuit is formed at the moment when the reference piece comes into conductive contact with the reference piece, and the coordinate system set value is determined by detecting the electric current flowing through the closed circuit by induction or the like. (7) Effects As explained above, according to the present invention, by measuring the position on the workpiece W mounting surface side using the measuring means on the turret side,
This is a coordinate system setting device for a machine tool that can easily and automatically set workpiece machining from a program origin by calculating true coordinate system setting values with a calculation means, and can be accurately and easily controlled. Therefore, it contributes to improved precision, automation, and efficiency in machining operations without causing malfunctions. 4. Brief Description of the Drawings FIG. 1 is a schematic configuration diagram for explaining the coordinate system setting device of the present invention. FIGS. 2A to 2H are diagrams showing examples in which the detection location of the touch sensor T in FIG. 1, the position of the program origin, and the presence or absence of replacement are changed. FIG. 3 is a configuration block diagram showing an example of a coordinate system setting device embodying the present invention. FIG. 4 is a flowchart for explaining the present invention in detail. H... Headstock S... Spindle C... Chuck D... Jaw 0,... Machine origin
02...Program origin T,...Turret
T6... Taleft Ts... Evening 7th Sensor P,・
...Preset sensor L, ...limit switch
L...Arm Zy...Y7 Sensor length Z-...Work material length δ...Machining allowance ZH
...Amount of movement of the turret Zo...Amount of movement of the preset sensor Z0...True coordinate system setting value Zo'...Temporary coordinate system setting value ZF...Length of the touch sensor lOO...・CPU
12... Calculating means 15, 22.28...
Arithmetic unit Fig. 1 (A) (C) Fig. 2 (B) (D) (E) (G) Fig. 2 CF) (H)

Claims (1)

[Claims] A chuck attached to the main shaft of the headstock and having claws for grasping the workpiece, a tool rest movable in two orthogonal planes to process the workpiece held by the chuck, and a measuring instrument attached to the tool rest. a position detection means for detecting the amount of movement of the tool post based on a signal from the measurement means; a means for setting a reference length of the measurement means; a means for determining, an input means for setting the length of the workpiece, the amount of machining allowance, and whether the program origin is the work reference on the jaw side or the work reference on the turret side; and a coordinate system based on the input settings of each of the input means. A coordinate system setting device for a machine tool, comprising a calculation means for calculating set values.