JPS62241635A - Additional processing device in machine tool - Google Patents

Abstract

PURPOSE:To enable the prevention of the occurrence of an improper workpiece by providing an additional process setup memory for setting up an additional processing program for the concerned processing part on the basis of an additional processing instruction discriminated on a tolerance discrimination means. CONSTITUTION:Discrimination is made as to whether an outer diameter with an inner diameter of +NG happens to have an inner diameter of -NG. If the inner diameter is -NG, judgement is made to stop a subsequent process for measuring NG and a stop flag is set up, thereby notifying the forbid of transit to the subsequent process. When there is an NG area for additional processing, the concerned measuring position number and tool number are outputted from a measuring function processing program, and temporarily stored in a register 21. And according to NC processing data stored in an additional work setup memory 22, additional work processing is made and judgement is again made about the continuity of the subsequent process. As aforementioned, the sizes of a workpiece are measured and judgement is made as to whether the measured value is within a tolerance, thereby making a process for a good workpiece through an additional work, regardless of the measured value exceeding the tolerance.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention measures the dimensions of the workpiece using an automatic measuring device after machining the workpiece with an NC machine tool or during the machining process, determines the tolerance, and determines the tolerance based on the determination of the intersection. The present invention relates to an additional machining processing device for a machine tool that performs additional machining on salvageable machining locations.

<Conventional technology> Conventionally, after or during machining of a workpiece with an NC machine tool, the machining dimensions of the workpiece are measured using an automatic measuring device, such as a measuring device equipped with a touch sensor on the spindle, and tolerances are determined in advance. For the set tolerance area,
It determines whether the work is inside or outside the area, and if the work is determined to be outside the area, the operator is notified as a workpiece machining defect.
Autonomous driving was suspended to investigate the cause.

<Problems to be solved by the invention> However, in NC machine tools, especially FMS, multi-step machining is operated in a coordinated manner according to a machining schedule, which increases the time lost from when operation is stopped until operation is restarted. This caused a decrease in production efficiency.

The purpose of the present invention was proposed in order to solve the problems in view of the above circumstances, and it is an object of the present invention to solve the problem by using additional machining to correct machining defects outside the tolerance range when the machining dimensions of a workpiece are measured using an automatic measuring device. It is an object of the present invention to provide an additional machining processing device for a machine tool that can perform additional machining on items that can be placed within the area.

Means and operation for solving the above problems> In the present invention, means for solving the above problems are as follows:
In an NC machine tool equipped with an automatic measurement device, a measurement value calculation means for calculating the difference between a measurement value of a machining location measured by the automatic measurement device and a preset measurement target value, and a tolerance determining means for determining whether or not additional machining is possible based on the preset correction value based on a preset tolerance, and an additional machining program for the corresponding machining location based on the additional machining instruction determined by the tolerance determining means. The present invention is an additional machining processing device for a machine tool, characterized by comprising additional machining settings and memory to be set.

By adopting the device of the present invention, a tolerance is determined when measuring the diameter of a workpiece, and based on the tolerance determination, an additional machining program stored in the additional machining setting/memory is activated based on the additional machining command. At the very least, it is possible to prevent workpiece defects as much as possible by performing additional machining and converting a defective workpiece into a non-defective workpiece.

In particular, the FMS system can prevent interruptions in automatic operation as much as possible, improving production efficiency.

<Example> Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

(1) First, the overall configuration of an FMS line suitable for implementing the present invention will be described.

FIG. 2 is a schematic diagram of an FMS line suitable for implementing the present invention.

In FIG. 2, the system is roughly composed of a management department and a work department, and the management department includes a line management control section 100 and a general management control section 101. The line management control unit 100 controls the flow of each processing process while the system is online.
The comprehensive management control unit 101, which is in charge of flexible control according to the schedule and is located above it, is the preparation information of the present invention. Tool station 119. Tool management data, NC machining data, machining schedule data, setup rescheduling data, etc. in the tool magazines 121a, 121b and tool room 120 of each NC machine 103a, 103b are comprehensively grasped and managed. The line management control section 100 and the general management control section 101 are connected via a modem M (modulation/demodulation device) between CCUs (communication control units), and transmit and receive data.

In the work department, the main controller 102 is the line management control unit 10
The data sent every moment from 0 to each NC machine 103a
, 103b, the NC device 104a.

A command is given to 104b. Along with the line management control unit 100, the main control device 102 and the NC devices 104a and 104b
is linked to the optical data highway 105 and the NLU
(Network Linkage Unit) to import the necessary data as and when required.

The main controller 102 is a PC of each NC machine 103a, 103b.
Device (programmable controller) 122a, 1
22b.

The main controller 102 is an AP of each NC machine 103a, 103b.
It is also connected to C (automatic pallet exchange device) 123a and 123b.

The main controller 102 also controls an unmanned trolley 108 that runs on tracks 106 and 107. It is also connected to a ground platform 110 that controls the stacker crane 109. Tool station 11 equipped with a tool stocker that also supplies tools
9. In addition, an operation panel 112 located at the setup station 111 that mainly controls manual setup operations is connected to a terminal 113 that inputs setup information and displays setup instructions.
Connected to U.

The worker operates the terminal 113 to output the setup schedule data and machining schedule data created by calculating the load, and confirms the work schedule for -day.

At the setup station 111, necessary workpieces and pallets are taken out from the work storage 114 and pallet storage 115, and the installation is carried out at the station 116.
Attach the workpiece to the pallet using the necessary jigs and tools.

Under the control of the FMS type control system shown in FIG. 2, the pallets P prepared in the setup-side pallet stocker 117 are temporarily held at a predetermined position in the machine-side pallet stocker 118 by the stacker crane 109. Main controller 102
According to the command, the desired pallet P is transported by the unmanned cart 108, and is carried into, for example, the APC 123b of the NC machine 103b.

The processed pallet P is transported by an unmanned cart 108.
The product is transferred to the next process or placed on the machine side pallet stocker 118.

(2) Next, a machine tool to which the device of the present invention is applied will be explained.

FIG. 3(A) is a side view of a vertical machining center which is an example of a machine tool.

In FIG. 3(A), a saddle 129 movable in the Y-axis direction is placed on a bed 130, and a table 131 movable in the X-axis direction (perpendicular to the plane of the paper) is mounted on the saddle 129. It will be placed.

A column 132 is erected on the bed 130, and a spindle head 133 movable in the Z-axis direction is mounted in front of the column 132.
is installed.

A tool storage magazine 134 is arranged on the left side of the column 132, and a plurality of tools T are stored therein.

A main shaft 135 is rotatably supported on the main shaft head 133 .

An automatic tool changer is installed between the spindle 135 and the tool storage magazine 134! ! (circuit) is installed, and normally the machined tool inserted into the spindle 135 and the next processing tool stored in the tool storage magazine 134 are automatically exchanged by an automatic tool changer.

In FIG. 3(A), a touch sensor Ts is inserted into the main shaft 135 to automatically measure the dimensions of the workpiece.

The detection section of the touch sensor Ts is made up of a ring-shaped exciting core 136a and a detection core 136b, as shown in FIG. At the moment when the sensor Ts comes into conductive contact with the workpiece W, the detection core 136b forms a closed loop L in the machining center as shown in FIG. etc. are automatically measured.

(3) The basic idea of the present invention will be explained.

FIG. 4 is a model diagram explaining the present invention. In FIG. 4, for example, when a workpiece is subjected to internal diameter machining according to a command from an NC machine program, CL is the center axis of the internal diameter machining, and when the internal diameter after machining is measured by the touch sensor Ts, this measured value and the preset measurement target value A
The difference value from 0, that is, the correction value ΔA, is within the preset tolerance ±
Compared to Δa, if ΔA is within the range of ±Δa, OK1+
Issues an OK or -OK signal. Note that the +OK and -OK regions are set to required values as prediction limits of tool wear, etc. in the tolerance region. And +OK or -
If it is within the OK range, a correction command signal is issued so that the next workpiece can be machined within the 0Kjil range. -N
In the G area, even if there is a workpiece machining defect, it can be salvaged by additional machining, and an additional machining command is issued, +N
When it is in the GeI range, an NG signal indicating a workpiece failure is generated. +
When the value is in the +NG51 range or the -NGjl range, this indicates that there has been a sudden change in machining along with a workpiece failure, and a tool breakage signal is generated.

(4) The specific configuration of the present invention will be explained.

FIG. 1 is a control block diagram showing the configuration of the present invention. In FIG. 1, the FMS line explained in FIG. 2 is connected to a CPU 100 (line management control section). The details have already been explained, so they will be omitted.

The CPU 100 has an input/output circuit 2 from a keyboard 2 with a screen.
Measurement target value A0 and tolerance ±Δa preset via a
is input and stored in the measurement target value register 7 and tolerance value register 8, respectively. In addition, processing schedule file 3 includes processing order, pallet fish 1 part name, 1st process NC
Processing data, second step NC processing data, etc. are input and filed. Further, the tool correction data memory 4 stores correction data such as the inner diameter or outer diameter for each tool fish as a result of processing to be described later.

In the CPUI 00, data indicating the online system operating status (for example, the pallet m being processed in each processing process, the pallet Th on the trolley, etc.) is organized from time to time and filed in the system operating status file 5. .

The workpiece is processed by the NC machine 103a or 103b, and then automatic measurement is performed by the touch sensor T. Measured measurement coordinate values Xa++Xaz+Zal, zaz
(FIG. 6 (aL (b)) is stored in the measurement coordinate value register 6. The AND gate 10 is opened by the measurement touch signal, and the measurement coordinate value X stored in the measurement coordinate value register 6 is
a 11 X a 2 + Z a + + Z a
z is taken into the measured value calculation circuit 11.

The measurement target value register 7 is already stored in the measurement value calculation circuit 11.
Since the measurement target value A0 stored in is loaded, (Xal Xa2) A, 0 or (Za+
Zaz) A.

calculation processing is performed. ΔA as a correction value calculated by the measurement value calculation circuit 11 is taken into the tolerance determination circuit 12 and the correction value register 13.

The upper tolerance Δa stored in the tolerance value register 8 and the machining content corresponding to the measurement location stored in the machining content table 9 are taken into the tolerance determination circuit 12 and tolerance determination is performed. As shown in FIG. 4, the tolerance judgment circuit 12
If it is within the OK N range, an OK times signal is output. If ΔA is within the range of -Δa or +Δa, that is, within the +OK or -OK range, a correction command is output together with an OK signal. At the same time, it is also taken into OR Gate 15. When the internal diameter machining is within the NG region, and when the outer periphery round machining is within the NG region, an additional machining command signal is output and also taken into the OR gate 15. When the inside diameter machining is within the +NG6N range, and the outer periphery round machining is within the -NG range, an NG signal is output and the OR gate 15. and 17.

Both inner diameter machining and outer circumference perfect circle machining are in the ++NG range or --N.
G? When in the ii region, a tool breakage signal is outputted and taken into the OR gate 17.

OK correction command taken into OR Gate 15.

Either the NG signal or the additional machining command signal opens the AND gate 16, the correction value △A stored in the correction value register 13 passes through the AND gate 16, △A is output, and tool correction is performed. The data is stored in the correction data column of the data memory 4. The correction data at the time of the NG signal becomes reference data at the time of repair.

Either the NG signal or the tool damage signal taken into the OR gate 17 is taken into the next process abort flag set memory 18. Further, when a signal at the start of machining is taken into the next process abort flag set memory 18 via the reset circuit 14, the flag is reset.

The additional machining command opens the AND gate 20 and reads the corresponding measurement point numbers KOI and KO from the measurement operation processing program stored in the measurement operation processing program memory 19.
2..., the tool numbers TOI and TO2 are temporarily loaded into the register 21. If there is an additional work order, register 2
Bit 1 is set in the additional machining FLG column for tool number T for the corresponding measurement point number stored in bit 1.

When a command for additional machining is issued, the corresponding machining location in the flag 1 column of the additional machining setting/memory 22 is determined, and the NC machining data for the machining location is activated to perform the additional machining. It is possible to appropriately select whether additional machining is to be performed immediately or after all machining is completed.

(5) The operation of the present invention will be explained with reference to the flowchart shown in FIG. In FIG. 5, machining is started, and first, in the 0th stage, the NC machine 103a or 103b performs internal diameter machining, area machining, outer periphery perfect circular machining, etc. on the workpiece. Next, at stage 0, the flag in the next process abort flag set memory 18 is reset. At the 0th stage, as explained in FIG. 3, the touch sensor T inserted into the spindle measures the required machining location on the workpiece. The 0th stage determines whether the measured value is within the tolerance range, and if it is within the tolerance range, the 0th stage determines whether to perform another measurement.

If there is another point to be measured at stage 0, it will be fed back before stage 0. The measurement ends when all the locations to be measured are completed.

If it is determined at the 0th stage that the measured value is outside the tolerance range, the 0th stage determines whether the tool is damaged (++NG,...
NG) Judge. If the tool is damaged at stage 0, a tool damage notification will be issued at stage 0, and if the tool is not damaged, the process will proceed directly to stage 0, and at stage 0, the next process abort flag will be set in the memory 18. If the flag is set, it is fed back before the 0th stage. If the abort flag is not set at the 0th stage, it is determined at the 0th stage whether the inner diameter (including area machining) is 10NG or the outer diameter is -NG.

If it is NG in the 0th stage, it is determined whether the measurement N0th process should be aborted in the 0th [phase] stage, and an abort flag is set in the 0th stage to notify the user not to proceed to the next process.

When there is an NG region that can be additionally machined in the 0th stage, the corresponding measurement point number and tool number are output from the measurement operation processing program in the 0th stage and temporarily stored in the register 21. Next, in the 0th stage, based on the measurement point number and tool number stored in the register 21, 1 is set in the corresponding flag column of the setting/memory. Additional work setting/corresponding N stored in memory 22 in the [phase] stage
Additional machining is performed based on the C machining data, and a decision is made to continue with the next process, which is fed back before the 0th stage.

Alternatively, the additional machining program memory 22 may be an NC machining program memory, and the pickup data that can be extracted corresponding to each data of the output register 21 may be added to the NC machining program memory.

<Effects> The present invention measures the dimensions of the workpiece using an automatic measuring device after processing the workpiece with an NC machine tool, particularly FMS, or during processing, and determines whether the measured value is within the tolerance range. Even if it is determined that the workpiece is outside, it is now possible to make the workpiece into a non-defective product by performing additional machining if it is possible. □Therefore, it is possible to prevent defects in workpieces as much as possible, and system stoppages of NC machine tools, especially FMS, can be prevented to the utmost, so production efficiency is greatly improved.

Furthermore, the present invention can support flexible processing management in automation.

[Brief explanation of drawings]

FIG. 1 is a control block diagram showing the configuration of the present invention. FIG. 2 is a schematic diagram of an FM line suitable for implementing the present invention. FIG. 3(A) is a side view of a hard wall machining center which is an example of a machine tool, and FIG. 3(B) is an explanatory diagram of an exciting core and a detection core built into a ring-shaped touch sensor. FIG. 4 is a rod diagram explaining the basic principle of the present invention. FIG. 5 is a flowchart illustrating the present invention in detail. FIG. 6 is an explanatory diagram of measurement coordinate values measured by the touch sensor. 1...CPU 2...Keyboard with screen 3...Machining schedule file 4...Tool correction data/memory 11...Measurement value calculation circuit 12...Tolerance judgment circuit 18...Next process abort Flagsent Memory 22...
・Additional work setting・Memory 104a, 104b-...NC device 122a, 1
22b.=PC device 106... Track 108... Unmanned trolley 1
10... Ground platform 118... Machine side pallet stocker TS... Touch sensor Patent applicant Hitachi Seiki Co., Ltd. Fig. 3 (B) Fig. 4 Fig. 6 (b) (Q) Fig. 5

Claims (1)

[Claims] In an NC machine tool equipped with an automatic measurement device, a measurement value calculation means for calculating the difference between a measurement value of a machining location measured by the automatic measurement device and a preset measurement target value, and a tolerance determining means for determining whether or not additional machining is possible based on the preset correction value based on a preset tolerance, and an additional machining program for the corresponding machining location based on the additional machining instruction determined by the tolerance determining means. An additional machining processing device for a machine tool, characterized by comprising additional machining settings and memory to be set.