JPS61117050A - Correction working apparatus for nc machine tool - Google Patents

Abstract

PURPOSE:To permit the perfect automation up to the final work by correction- controlling a tool chuck by comparing the working position detected by the sensor of a sensor chuck and an objective working value. CONSTITUTION:When a hole (w) is worked onto a workpiece W, a changer 21 is transferred successively by the selection instruction supplied from a controller 31, and when a tool chuck 1 having a prescribed tool 2 comes under a driving part 3, the tool chuck 1 is mounted onto the driving part 3 by the extension of a shaft 22, and the workpiece W is automatically worked. When the work is completed, the changer 21 demounts the tool chuck 1 from a holding part 3, and then transfers the changer 21 holding a sensor chuck 11, and similarly holds the changer 21 into the driving part 3, and the diameter of the hole is measured by a measuring probe 12. When a working error is not detected, the next instruction is outputted, and when a working error is detected, a correction working instruction is outputted on the basis of the error value.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an NC system in which automatic processing is performed by numerical control.
The present invention relates to machine tools, and particularly to a correction machining device that corrects an error between an actual machining state and a machining target value.

[Technical background]

Recent machining equipment uses NC machine tools that perform automatic machining through numerical control. Examples of this type of NC machine tools include machining centers, milling cutters, electrical discharge machines, and grinding machines.

The tool chuck in this type of NC machine tool is
The structure is as shown in the figure. The tool chuck indicated by reference numeral l in FIG. 2 is capable of holding various tools 2 at its tip.

This tool 2 is a drill, end mill, or reamer. A holding mechanism using a collet is provided in the tool chuck 1, and each tool 2 is held in a centered manner by this holding mechanism. The tool chuck 1 has a tapered portion 1 at its base.
a is held in the drive section 3 of the NC machine tool.

In an ATC type (auto tool changer type) NC machine tool, a rotary changer is provided below the drive unit 3 of the NC machine tool, and this changer has a plurality of tool chucks each having different types of tools 2. 1 are held in a row. Then, the tool chuck 1 holding the tool 2 necessary for machining is selected, and the drive unit 3
It is designed to be held in

[Conventional problems]

In this type of NC machine tool, the drive unit 3 is driven based on numerical values input in advance to a control device to perform predetermined machining. However, in actual machining, errors may occur between the input value and the machining position due to tolerances in the diameter of the tool 2, differences in sharpness, errors in the position between the workpiece and the tool 2 during machining, etc. There is.

Conventionally, this processing error has been measured manually.

In other words, after the specified machining is completed, the machine tool is temporarily stopped, the hole or machined surface is added using a hand indicator, etc., and the value, or the difference between that value and the machining target value, is input into the control device. , I am trying to perform correction processing again.

Therefore, measurement and machining must be repeated until the machining dimensions match the target values, which requires a lot of manpower and reduces work efficiency.

[Object of the present invention]

The present invention has been made by focusing on the above-mentioned conventional problems, and a correction operation is automatically performed to match the actual machining position with the machining target value, making it possible to completely automate the process up to the final machining. The purpose is to provide a correction processing device for NC machine tools.

[Configuration of the present invention]

The correction machining device according to the present invention is an NC machine tool in which a tool chuck is selected and held according to the machining process.
A sensor chuck equipped with a sensor for detecting the machining position and held in the machine tool instead of the tool chuck is used to compare the machining position detected by the sensor with a machining target numerical value input in advance and determine the difference between the two. The tool chuck is equipped with a control device that operates the tool chuck in a corresponding manner.
, 1, and by the action of the control device, the machining for correcting the error between the actual machining position and the machining target value is performed continuously after the original machining operation. This is what has become.

[Example of the present invention]

Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 is a front view showing a sensor chuck that is a feature of the present invention, Fig. 2 is a front view showing a tool chuck, and Fig. 3 (A
3(B) is a front view of the control device, FIG. 4 is a partial front view of the changer in the ATC system, and FIG. 5 is a flowchart of the control device. .

The sensor chuck 11 shown in FIG. 1 has the same external shape and dimensions as the tool chuck l shown in FIG. It is now possible to do so.

A sensor measurement probe 12 is protruded from the tip of the sensor chuck 11. For example, a mechanical sensor is used as this sensor. In the case of the JA structure, when the measuring prong 12 touches the machined surface from the lateral direction or touches the axial direction, the contact operates and generates a detection signal. If the sensor is of a magnetic force type, contact with the processing surface will be detected based on a change in magnetic flux when the measurement prong 12 touches the processing surface. Alternatively, electronic or optical sensors can be used.

The side surface of the sensor chuck 11 is equipped with an oscillator 13 that oscillates a detection signal from the sensor. Inside the sensor chuck 11 is a power source 1 for driving the sensor.
4 is equipped. Further, a switch 15 is provided on the upper surface of the flange portion llb of the sensor chuck 11. When the sensor chuck 11 is attached to the drive unit 3 of the NC machine tool, this switch 15 is turned on and the power supply 1 is turned on.
4 drives the sensor.

The tool chuck 1 shown in FIG. 2 is capable of holding various tools 2 at its tip. This tool 2 is a drill, end mill, reamer, or the like. A holding mechanism using a collet is provided in the tool chuck 1, and each tool 2 is held in a centered manner by this holding mechanism.

As shown in FIG. 4, in the ATC system (auto tool changer type), a plurality of changers 21 are provided below the drive section 3 of the NC machine tool. The changers 21 are arranged in a circle below the drive unit 3.
By rotationally moving in the arrangement direction, the tool chuck 21 equipped with a predetermined tool 2 is moved below the drive unit 3. Each changer 21 is integrated with a shaft 22, and when this shaft 22 extends to the state shown by the chain line in FIG. 4, the tool chuck 1 can be replaced with respect to the drive unit 3. ing.

As shown in FIG. 3(A), a work table 25 is provided below the drive unit 3 of the NC machine tool.
The work table 25 and the work table 25 are relatively movable.

FIG. 3(B) shows the control device. Inside the control device 31, there is a reading device for inputting processing information punched into the tape or magnetically recorded on the tape, a storage device for the information, and a drive section 3 and the like based on the stored information. A drive circuit for relatively moving the work table 25 is equipped. Further, this control device 31 is provided with a receiver 32 . This receiver 32
is the oscillator 13 when the measuring probe 12 comes into contact with the machined surface.
It receives signals emitted from.

The control device 31 also includes a device that determines the relative position of the drive unit 3 and work table 25 when the receiver 32 receives the signal, and a device that determines the actual machining position and machining target value determined by this device. A comparison device for comparison and a drive device for moving the drive unit 3 or work table z5 by Xτ based on the numerical value of the machining error calculated by comparison are built in.

Next, the operation of the above embodiment will be explained.

In the ATC method, a plurality of changers 21 provided below the drive unit 3 each hold a tool chuck 1, and each tool chuck l holds several types of tools 2 such as drills and end mills with different machining forms and dimensions. kept separately. Further, one of the changers 21 holds a sensor chuck 11.

For example, when drilling a hole indicated by the symbol W in FIG. 3(A) on the workpiece W, a tool 2 such as a drill or an end mill that corresponds to the diameter of the hole W is selected. Control device 3
When a command to select a tool 2 from 1 is issued, the changer 21 sequentially moves, and the tool chuck 11 having a predetermined tool 2 is sent to the lower side of the drive unit 3. Then, the shaft 22 extends, the changer 21 is lifted as shown by the chain line in FIG. 4, and the tool chuck 1 is held by the drive section 3. Then, the workpiece W is automatically processed by the tool 2 held by the tool chuck 1.

When the predetermined processing is completed, the changer 21 removes the tool chuck 21 used for processing from the holding part 3, and then the changer 21 moves and removes the tool chuck 21 used for processing from the sensor chuck 11.
The changer 21 holding the sensor moves below the drive section 3, the shaft 22 extends, and the sensor chuck 11 is held by the drive section 3. When the sensor chuck 11 is held by the drive unit 3, the switch 15 (see FIG. 1) is turned on, and the sensor inside the sensor chuck 11 is put into operation. Then, the drive unit 3 is moved to place the measurement probe 12 of the sensor into the machined hole W. When the holding part 3 is further moved, the tip of the measuring prong 12 hits the inner peripheral surface or the bottom surface of the hole W, and at this time, the oscillator 13 emits a signal. This signal is received by receiver 32.

Within the control device 31, the relative position of the main shaft of the drive unit 3 and the work table 25 at the time when the receiver 32 receives the signal is determined. After measuring the positions by bringing the measuring probe 12 into contact with several locations on the machined surface, the diameter dimension, center position, depth of the hole W, etc. of the hole W are calculated from these locations. As shown in the flowchart of FIG. 5, this calculated value is compared with a machining target value inputted in advance. As a result of the comparison, if it is determined that there is no machining error, an instruction for the next machining is given. However, when it is determined that there is an error between the actual machining position and the machining target value based on the above calculation, a command for corrective machining is issued based on the error value. Then, the tool cher and rim 1 are replaced again, and correction machining is performed. After that, measurement is performed again, and machining is repeated until the machining position matches the machining target value.

Note that the correction machining device according to the present invention is not limited to a cutting machine tool like the embodiment shown in the figure, but can also be implemented in an NC electric discharge machining device, an NC grinding machine, and the like.

C. Effects of the present invention] As described above, according to the present invention, the following effects can be achieved.

(1) The sensor installed in the sensor chuck measures the machining surface and machining position, the actual machining position is determined based on the measurement signal, the error between this machining position and the machining target value is calculated, and this error Correction processing is performed to correct this.

Therefore, manual measurement work and input work of correction values are no longer necessary, and work efficiency is greatly improved.

(2) Since machining error measurement and correction machining based on the measurement are automatically performed, finishing machining can be performed completely unattended, resulting in labor savings.

(3) Since the actual machining position is measured by the sensor on the sensor chuck held instead of the tool chuck, machining and measurement are performed under the same conditions. Therefore, the measurement accuracy is higher than that of artificial measurement means, and correction processing based on this measurement can also be performed with high precision.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view of a sensor chuck, and FIG. 2 is a tool. : Front view of the chuck, Figure 3 (A) is a partial view of the NC machine tool showing the state in which the tool is facing the workpiece, Figure 3 (B)
) is a front view of the control device, FIG. 4 is a partial front view showing a tool changer in the ATC system, and FIG. 5 is a flowchart showing correction control by the control device. 1...Tool Char 2, 2...Tool, 3...
Drive unit of NC machine tool, 12... Measuring probe connected to sensor, 13... Oscillator, 14...
Power supply, 15... Switch, 21... Tool changer, 31... Control device, 32... Receiving sound. Applicant Alps Electric Co., Ltd. Agent Patent Attorney Teruo Nozaki Figure 1 Procedural Amendment Form (sealed) 1 Indication of the case 1982 Patent Application No. 237331 2 Name of the invention Correction processing device for NC machine tools 3 Person making the amendment 6 Number of inventions increased by amendment None 7 Subject of amendment CI+1 Emu-f tT 'iT [TB jl
T+ Bird) '4k Ll l etc) 67YO "φ5n) - Specification 8 Contents of the amendment Full text of the amendment M1 Name of the invention Correction processing device for NC machine tools 2 Claims Tool chuck according to the processing process In an NC machine tool where is selected and held, a sensor chuck that detects ] is provided and is held on the machine tool in place of the tool chuck. Compare the machining process 1 j and corresponding to the difference: 1
A correction machining device for an NC machine tool, comprising: a control device that performs a correction operation on J1. 3. Detailed Description of the Invention [Technical Field] The present invention relates to an NC system in which automatic processing is performed by numerical control.
The present invention relates to machine tools, and particularly to a correction machining device that corrects an error between an actual machining state and a machining target value. [Technical Background] Recent processing equipment uses NC machine tools that perform automatic processing through numerical control. Examples of this type of NC machine tools include machining centers, milling cutters, electrical discharge machines, and grinding machines. The tool chuck in this type of NC machine tool is
The structure is as shown in the figure. A tool chuck designated by reference numeral 1 in FIG. 2 is capable of holding various tools 2 at its tip. This tool 2 is a drill,
These include end mills and reamers. A holding mechanism using a collet is provided in the tool chuck 1, and each tool 2 is held in a centered manner by this holding mechanism. And Toolcha
The taper portion 1a at the base of the tool 1 is held by a drive section 3 of an NC machine tool. In an ATC type (auto tool changer type) NC machine tool, a rotary changer is provided below the drive unit 3 of the NC machine tool, and this changer has a plurality of tool chucks each having different types of tools 2. 1 are held in a row. Then, the tool chuck 1 holding the tool 2 necessary for machining is selected, and the drive unit 3
It is designed to be held in [Conventional Problems] In this type of NC machine tool, the drive unit 3 is driven based on numerical values input in advance to a control device to perform predetermined machining. However, in actual machining, errors may occur between the input values and the machining dimensions due to tolerances in the diameter of the tool 2, differences in sharpness, errors in the position between the workpiece and the tool 2 during machining, etc. be. Conventionally, this processing error has been measured manually. That is, after the predetermined processing is completed. , 1; Stop the machine tool once, measure the hole or machined surface using a hand indicator, etc., input that value or the difference between that value and the machining target value to the control device, and perform correction machining again. That's what I do. Therefore, measurement and machining must be repeated until the machining dimensions match the target values, which requires a lot of manpower and reduces work efficiency. [Object of the Invention] The present invention has been made by focusing on the above-mentioned conventional problems, and it is possible to automatically perform a correction operation to make the actual machining dimensions match the machining target values, thereby improving the final machining. The purpose is to provide a correction machining device for NC machine tools that can be completely automated. [Structure of the Invention] The correction machining device according to the present invention is an NC machine tool in which a tool chuck is selected and held according to the machining process.
A sensor chuck is provided with a sensor that detects a position, an oscillator that emits a wireless signal in response to the detection of the sensor, a power source that drives the oscillator, and is held in the machine tool in place of the tool chuck, and a sensor chuck that receives the wireless signal. It is equipped with a control device that calculates machining dimension values from this signal, compares these machining dimension values with pre-input machining target values, and causes the machine tool to operate in a corrective manner in response to the difference. This is characterized by the fact that, through the action of the control device, machining to correct the error between the actual machining dimensions and the machining target value is performed continuously after the original machining operation. . [Embodiments of the Invention] Examples of the present invention will be described below with reference to the drawings. Fig. 1 is a front view showing a sensor chuck that is a feature of the present invention, Fig. 2 is a front view showing a tool chuck, and Fig. 3 (A
) is a front view showing the machining section of a workpiece, FIG. 3(B) is a front view of the control device, FIG. 84 is a partial front view showing an example of a changer in the ATC method, and FIG. be. The sensor chuck 11 shown in FIG. 1 has the same external shape and dimensions as the tool chuck 1 shown in FIG. It is now possible to do so. A sensor measurement probe 12 is protruded from the tip of the sensor chuck 11. For example, in the case of a mechanical type sensor, when the measuring probe 12 touches the machined surface from the side or the axis, the contact operates and generates a detection signal. It has become. If the sensor is of a magnetic type, contact with the processed surface will be detected based on a change in magnetic flux when the measurement probe 12 touches the processed surface. Alternatively, electronic or optical sensors can be used. A transmitter 13 is installed on the side of the sensor chuck 11 to transmit a detection signal from the sensor. A power source 14 for driving the transmitter 13 is installed inside the sensor chuck 11 . Also, 7 of sensor chuck 11
A switch 15 is provided on the upper surface of the rung portion 11b. When the sensor chuck 11 is attached to the drive unit 3 of the NC machine tool, this switch 15 is turned on and i1
! The transmitter 13 is set to a transmittable state by the source 14. The tool chuck l shown in FIG. 2 is capable of holding various tools 2 at its tip. This tool 2 is a drill, an end mill, a reamer, or the like. A holding mechanism using a collet is provided in the tool chuck I, and each tool 2 is held in a centered manner by this holding mechanism. In the example of the ATC system (auto tool changer type) shown in FIG. 4, a plurality of changers 21 are provided below the drive section 3 of the NC machine tool. The changers 21 are arranged in a circular pattern below the drive unit 3, and by rotationally moving in the arrangement direction, a predetermined tool 2 is selected.
A tool chuck 21 equipped with a tool chuck 21 is adapted to move below the drive section 3. Moreover, each changer 21 has a shaft. 22, and by extending this shaft 22 to the state shown by the chain line in FIG. 4, the tool chuck 1 can be replaced with respect to the drive unit 3. As shown in FIG. 3(A), a work table 25 is provided below the drive unit 3 of the NC machine tool.
The work table 25 and the work table 25 are relatively movable. FIG. 3(B) shows the control device. Inside the control device 31, there is a reading device for inputting processing information punched into the tape or magnetically recorded on the tape, a storage device for the information, and a drive section 3 and the like based on the stored information. A drive circuit for relatively moving the work table 25 is equipped. Further, this control device 31 is provided with a receiver 32 . This receiver 32
is the transmitter 13 when the measuring probe 12 comes into contact with the machined surface.
It receives signals emitted from. The control device 31 also includes a device that determines the relative position of the drive unit 3 and work table 25 when the receiver 32 receives the signal, and a device that determines the actual machining dimensions and machining target values determined by this device. A comparison device for comparison and a drive device for moving the drive unit 3 or the work table 25 based on the numerical value of the machining error calculated by comparison are built in. Next, the operation of the above embodiment will be explained. In the ATC method, a plurality of changers 21 provided under the drive unit 3 each hold a tool chuck 1, and each tool chuck 1 holds several types of tools 2 such as drills and end mills with different machining forms and dimensions. kept separately. Further, one of the changers 21 holds a sensor chuck 11. For example, when drilling a hole indicated by the symbol W in FIG. 3(A) on the workpiece W, a tool 2 such as a drill or an end mill that corresponds to the diameter of the hole W is selected. control device 3
When a command to select the tool 2 is issued from the tool 1, the changer 21 moves sequentially, and the tool chuck 11 having a predetermined tool 2 is sent to the lower side of the drive unit 3. Then, the shaft 22 extends, the changer 21 is lifted up as shown by the chain line in FIG.
is maintained. Then, the workpiece W is automatically processed by the tool 2 held by the tool chuck I. When the predetermined machining is completed, the changer 21 removes the tool chuck 21 used for machining from the holding part 3. After that, the changer 21 moves and the sensor chuck 1
The changer 21 holding the sensor chuck 11 moves below the drive section 3, the shaft 22 extends, and the sensor chuck 11 is held by the drive section 3. The sensor chuck 11 is the drive unit 3
When the switch is held in the
As a result, the transmitter 13 in the sensor chuck 11 becomes operational. Then, the drive unit 3 is moved to insert the measurement probe 12 of the sensor into the hole W after processing. When the holding part 3 is further moved, the tip of the measurement probe 12 is inserted into the hole W.
The transmitter 13 emits a signal at this time. This signal is received by receiver 32. In the control device 31, the main shaft of the drive unit 3 and the work table 25 at the time when the receiver 32 receives the signal
The relative position is determined. After the measuring probe 12 is brought into contact with several locations on the machined surface and the positions of each portion are measured, the diameter dimension, center position, depth of the hole W, etc. of the hole W are calculated from these measured positions. As shown in the flowchart of FIG. 5, this calculated value is compared with a machining target value inputted in advance. As a result of the comparison, if it is determined that there is no machining error, an instruction for primary machining is given. but,
When it is determined that there is an error between the actual machining dimensions and the machining target value based on the calculation, a command for corrective machining is issued based on the error value. Then, the tool chuck I is ground detected again, and corrective machining is performed. Thereafter, measurements are taken again, and machining is repeated until the machining dimensions match the machining target values. Note that the correction machining device according to the present invention is not limited to a cutting machine tool like the embodiment shown in the figure, but can also be used for NC electric discharge machining 8 machines, etc. ,g
qmtxtctv hour □ Oh, ah 6.・′“〔
Effects of the Invention] As described above, according to the present invention, the following effects can be achieved. (1) The sensor installed in the sensor chuck measures the machining surface and machining position, the actual machining dimensions are determined based on the measurement signal, the error between this machining dimension and the machining target value is calculated, and this error Correction processing is performed to correct. Therefore, manual measurement work and input work of correction values are no longer necessary, and work efficiency is greatly improved. (2) Since machining error measurement and correction machining based on the measurement are automatically performed, finishing machining can be performed completely unattended, resulting in labor savings. (3) Since the actual machining dimensions are measured by the sensor on the sensor chuck held instead of the tool chuck, machining and measurement are performed under the same conditions. Therefore, the measurement precision is higher than that of a single artificial ΔIII constant means, and correction processing based on this measurement can also be performed with high precision. Brief Explanation of 4 Drawings The drawings show an embodiment of the present invention. Fig. 1 is a front view of the sensor chuck, Fig. 2 is a front view of the tool chuck, and Fig. 3 (A) shows the state in which the tool is attached to the workpiece. A partial view of the NC machine tool showing the facing state, FIG. 3(B) is a front view of the control device, FIG. 4 is a partial front view showing an example of a tool changer in the ATC method, and FIG. 5 is a front view of the control device. FIG. l...Tool chuck, 2...Tool, 3...N
Drive unit of C machine tool, 12... Measuring probe connected to sensor, 13... Transmitter, 14... Power supply, 15... S/F, 21... Tool changer 131... ...control device, 32...receiver.

Claims (1)

[Claims] In an NC machine tool in which a tool chuck is selected and held according to a machining process, a sensor chuck equipped with a sensor for detecting a machining position and held in the machine tool in place of the tool chuck; A control device that compares the machining position detected by the sensor with a pre-input machining target numerical value and corrects the tool chuck in response to the difference. Machine correction processing device.