JPH01264744A - Work machining method for nc machine tool - Google Patents

Abstract

PURPOSE:To reduce the memory volume of an NC device by fitting a memory means to each individual pallet, and memorizing at this memory means a correctional value led out from the size error of the individual pallet against a standard pallet size, and inputting this correctional value into an NC machine tool at a machining station. CONSTITUTION:A pallet 30 mounted with a work 1 is transported, and positioned and fixed at a predetermined machining station 11, and the reading of a correction value memorized in a memory card 31 is done by means of a reading head 21 and a reading device 22 during the transport process before its being fixed, and the correctional value is inputted into the information processing portion 20A of an NC machine tool 20. At the information processing portion 20A, a correctional data is formed by adding the correctional value to a machining program data prepared on the basis of the standard pallet 30 to be inputted. This correctional data is inputted into a control portion 20B, and the control portion 20B drives in control a machine tool main body 20C by means of this correctional data, and the work 1 is machined.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applied to an NC machine tool in a processing line in which a workpiece is placed on a pallet, transported, fixed to a processing station, and processed by an NC machine tool. Regarding workpiece processing methods.

[Prior art and its am] Conventionally, a so-called machining line has been used in which a workpiece is transported on a transport line in which NC machine tools are arranged adjacent to each other, and the workpiece is fixed to a machining stage paddle corresponding to the NC machine tool and processed by the NC machine tool. There is.

In such a processing line, workpieces are positioned and fixed on pallets in order to facilitate the transportation of complex-shaped workpieces and provide versatility.

It is configured to transport this pallet.

In this case, the pallet is positioned and fixed at the processing station, so that the workpiece is indirectly fixed to the processing station.

The NC machine tool processes a workpiece on a pallet according to a predetermined machining program, and its machining origin is at a fixed position with respect to the machining station. That is,
It is assumed that the relative position of the workpiece to the processing station is constant, and the processing is performed based on a processing program.

However, in the above method of positioning and fixing the workpiece to the pallet and further positioning and fixing the pallet to the processing station, errors in positioning the workpiece to the pallet, errors in the shape of the pallet, and errors in positioning the pallet to the processing station occur. , the respective errors accumulate and cause errors in the position of the workpiece relative to the processing station,
As a result, there is a problem in that errors occur in the machining accuracy of the workpiece. Among these, the shape error of the pallet has a large influence on the machining accuracy (it is relatively easy to improve the accuracy of positioning the workpiece to the pallet and positioning the pallet to the machining station).

As a solution to such problems, Japanese Unexamined Patent Publication No. 49-6
As disclosed in Japanese Patent No. 7274, errors in the placement of individual pallets with respect to standard pallet dimensions are stored in the storage device of the main computer (or the storage device connected to the main computer) that controls the entire processing line including the individual NC machine tools. When machining is performed using each NC machine tool, the error information of the pallet is read out from the main computer and the machining start origin position is corrected. Also, time opening +1i55-120957
As disclosed in the above publication, the inherent error of each pallet with respect to the reference pallet is stored in the storage device of the NC machine tool in the order of the pallet number, and during machining, the machining program is corrected based on this dimensional error information. There is something to do.

However, in the above-mentioned conventional configuration, error information for all valets/ The amount of information to be stored becomes enormous, requiring a corresponding storage capacity, and there is also the problem that in the unlikely event that this storage device fails, the stored data will be lost.

[Object of the Invention] In view of the above-mentioned personal circumstances, the present invention corrects the tool position based on the workpiece position d that changes due to the shape error inherent to the pallet, without relying on the processing line control device or the NCCaO storage device. processing. The purpose is to provide a workpiece machining method using NC machine tools.

[Structure of the Invention] In order to achieve the above object, a workpiece machining method using an NC machine tool according to the present invention includes: a storage means is attached to each individual pallet, and a dimensional error of the pallet with respect to a reference pallet size is calculated in the storage means. A reading means is arranged to store the correction value stored in the storage means and read the data stored in the storage means when the pallet is transported to the processing station, and the correction value read by the reading means is transferred to the NC machining station corresponding to the processing station. Configuring the machine to be human powered. The NC machine tool is configured to correct the tool position in the program and process the workpiece based on the unique correction value of the pallet in the corresponding processing station read by the reading means.

['X Example of the invention] Next, one embodiment of the present invention will be described based on the drawings.

1N is a plan view of a processing line to which the workpiece processing method of the NC machine tool according to the present invention is applied.

In the illustrated processing line, a plurality of NC machine tools 20 are arranged adjacent to each other at a predetermined position on the side of a transfer conveyor 10, and a processing station 11 is configured at a position of the transfer conveyor IO corresponding to each NC machine tool 20. has been done.

The workpiece l is positioned and fixed on the upper surface of a pallet 30 on the conveyor lO at a predetermined position (workpiece attachment/removal station 12) on the processing line, and the pallet 30 moves over the conveyor conveyor 10 in the direction indicated by the arrow in the figure. transported.

At each processing station 11, the positioning pin IIA is fitted into the positioning hole 30A of the pallet 30 to fix the position (as shown in the second figure), and the workpiece 1 is processed by the NC machine tool 20 corresponding to the processing station 11.

In addition, the operation of each NC machine tool 20 and the conveyor l
The transportation drive of the workpiece 1 by O, that is, the operation of the entire main processing line, is configured to be controlled by the main computer 50.

A memory card 31 serving as a storage means is fixed to a predetermined position on one side surface of the pallet 30 parallel to the conveying direction.

The memory card 31 has a semiconductor memory and an electronic circuit installed therein, and is configured to be able to read and write information in a non-contact manner through the action of electromagnetic induction by moving relative to the reading head 21, which will be described later. It is something.

Then, the memory card 31 stores information that is generated when the pallet 30 with the workpiece 1 positioned and fixed to the processing station 11 is positioned and fixed to the processing station 11 with respect to the reference position to which the workpiece 1 is to be fixed. The positional relationship (
The error of the dimension) from the standard dimension is the NC machine tool 20.
It is written as a correction value (±Xe±y·±2) in a form corresponding to the machining program data (X-Y-Z). This writing is performed by a writing head 41 disposed at the workpiece mounting/unmounting station 12 and connected to a data writing control device 40.

Each processing station 11 is provided with a reading head 21 as a reading means at a position facing a memory card 31 fixed to the pallet 30 when the pallet 30 is positioned and fixed to the processing station 11.

The reading head 21 is connected to a reading device 22 as shown in the second diagram.
The processing station 11 is connected to the corresponding NC machine tool 20 via the processing station 11, and when the pallet 30 is transported and positioned and fixed to the processing station 11, the reading head 21 and the reading device 22 are stored in the memory card 31. Read the corrected value and send the corrected value to the NC machine tool 2.
The data is input to the information processing unit 20A of No. 0.

In the processing line configured as described above, the work l can be processed while correcting the errors inherent in each pallet 30 by the following actions.

In other words, work l! ! The pallet 30 is transported and positioned and fixed at a predetermined processing station 11.
The correction value stored in the memory card 31 is read by the reading head 21 and the reading device 22 during the conveyance process before it is fixed, and the read correction value is
The information is input to the information processing section 20A of the NC machine tool 20.

In the information processing unit 20A, the correction
^ is added to form correction data. This correction data is
The data is input to the control M20B, and the control unit 20B controls and drives the machine tool main body 20C based on the correction data to process the workpiece 1. That is, by adding the error specific to each pallet 30 as a correction value to the machining program data created based on the reference pallet 30, the position of the machining tool of the NC machine tool 20 is made to correspond to the pallet 30 concerned. This allows processing in a corrected state.

In addition, in this processing line, the main computer 50 is configured to control the supply of lubricating oil to the sliding parts of the conveyor lO and the pallet 30, and the supply of lubricating oil is performed during processing by the NC machine tool. There is no such thing.

That is, the main computer 50 reads whether or not the NC machine tool 20 is machining from the control program of the NC machine tool, determines the oiling interval based on the NC machine tool 20 that has the longest machining time, and Machine tool 20
The oil supply device 60 is controlled so as not to supply oil during machining.

Figure 3 (A) shows the normal state, but a refueling ON timer and a refueling O
It has two timers, an FF timer, and after the refueling OFF timer counts the predetermined refueling OFF time, the refueling
The FF timer turns OFF and the refueling ON timer turns ON.
Then, refueling is started, and after the refueling ON timer counts a predetermined refueling time, the refueling ON timer is turned OFF and the refueling OFF timer is turned ON, so that refueling is stopped.

During machining by the NC machine tool 20 (when the machining command is ON),
If it is when the lubrication is off, the lubrication OFF timer takes priority even if the lubrication ON timer is ON, as shown in Figure 3 (B), and as soon as machining is completed, the lubrication OFF timer is turned OFF and the lubrication ON timer is turned off. It is controlled to turn ON (the timer stops for 1 period in the figure).

Also, if the machining command is turned ON during refueling.

As shown in Fig. 3 (C), the lubrication ON timer is turned OFF to stop lubrication, the lubrication ON timer and the lubrication OFF timer are both stopped, and at the same time as machining is completed, the lubrication ON timer is turned ON and the lubrication OFF timer is turned on. It is controlled to turn off and refuel.

This configuration prevents oil supply during workpiece machining, and prevents deterioration in machining accuracy caused by lifting of the pallet 30 due to oil pressure.

[Effects of the Invention] As explained above, according to the workpiece machining method using an NC machine tool according to the present invention, a control device or NC machine that controls the entire machining line is used. This makes it possible to perform machining by correcting the tool position based on the workpiece position, which changes due to the shape error inherent in the pallet, without depending on the storage device at the lt position.

As a result, the control device or NC that controls the entire processing line
Correction data will not be lost even if the storage device of the device breaks down, and since each pallet has a structure in which each pallet retains its own correction value, it is possible to use the processing line-based W device or This does not require a large storage capacity in the storage device of the NC device.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a machining line to which the NC machine tool workpiece machining method according to the present invention is applied, FIG. 2 is a block diagram of correction value reading at a machining station, and FIG. fjIJ3 is a time chart of oil supply control. l...Workpiece 10...Transport line 11...Processing station 20...NC machine tool 21...Reading head (reading means) 30...Pallet 31...Memory card (storage means) procedure Written amendment (
Method) July 1, 1986

Claims (1)

[Claims] A plurality of pallets with workpieces attached thereto are transported on a processing line, positioned and fixed at a processing station corresponding to an NC machine tool, and the NC machine tool performs the processing according to a processing program that sets tool positions based on predetermined pallet dimensions. A workpiece processing method using an NC machine tool for processing a workpiece on a pallet, the method comprising: attaching a storage means to each of the transported pallets; A reading means is arranged to store correction values stored in the storage means and read the data stored in the storage means when the pallet is transported to the processing station, and the NC machine tool reads the data read by the reading means. A workpiece machining method for an NC machine tool, characterized in that the workpiece is machined by correcting the tool position in the machining program based on the correction value.