JPH0596448A - Machining method for machining center - Google Patents

Abstract

PURPOSE:To save waste by reflecting a measuring result of a machining finished workpiece to machining the next workpiece and further contriving shortening a cycle time so as to perf orm remachining of the machining improper workpiece whose remachining is possible. CONSTITUTION:A machining method is applied to a machining center provided with a turn table 5 of exchangeably setting up a workpiece W in a machining side and an arrangement side and a measuring device for measuring the machining finished workpiece W placed in an arrangement side position Q. During rough machining(S3) of the workpiece W placed in a machining side position P on the table 5, the machining finished workpiece W placed in the arrangement side position is measured(S6). Necessary correction is performed(S7) in accordance with a measuring result to perform finish machining(S4) the rough machined workpiece W. When improper machining is judged possible to perform remachining at measuring time, remachining is performed (S10).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining method for a machining center equipped with a measuring device for measuring a machined workpiece in a machine.

[0002]

2. Description of the Related Art Conventionally, when machining a keyway or the like which requires strict dimensional accuracy in a machining center,
Since it is difficult to measure accurately inside the machine, the groove width etc. are measured with a dedicated measuring device after the processed workpiece is carried out of the machine. However, when the measurement is performed outside the machine in a subsequent process, the measurement result cannot be immediately reflected in the machining of the next work, and a large number of defective products may occur.

Therefore, the applicant of the present invention has developed a measuring device capable of accurately measuring the groove width of a workpiece in the machine. According to this, when the processed work is switched to the setup side position due to the rotation of the table, the groove width of the work is measured on the table, and the next work is processed by making a correction according to the measurement result. be able to.

[0004]

However, since the machining of the next workpiece is started after the measurement, there is a problem that the cycle time of the workpiece machining becomes long due to the time spent for the measurement.

An object of the present invention is to rework a defective work that can reflect the measurement result of a machined work in the machining of the next work, shorten the cycle time, and can be reworked. It is an object of the present invention to provide a machining method for a machining center that can reduce waste.

[0006]

The structure of the present invention will be described with reference to FIG. 1 corresponding to an embodiment. The present invention comprises a table (5) that installs a work (W) on the processing side and a setup side in an exchangeable manner, and a measuring device that measures the processed work (W) at the setup side position (Q). It is applied to equipped machining centers. In such a machining center, the work (W) at the processing side position (P) on the table (5)
During the rough machining (S3), the machined workpiece (W) at the setup side position (Q) is measured (S6), necessary correction is performed according to the measurement result (S7), and the rough machining is performed. Work (W)
The finishing process (S4) is performed.

[0007]

According to the method of the present invention, while the measurement result of the machined work (W) is reflected in the machining of the next work (W), the previous machined work ( Since W) is measured, the cycle time is shortened.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a plan view showing an example of a horizontal machining center to which the method of the present invention is applied. A column 2 is installed on a bed 1 so as to be driven back and forth (Z axis direction) and left and right (X axis direction), and a spindle head 3 having a spindle 4 is mounted on the column 2 so as to be vertically movable (Y axis direction). ..

A table 5 which horizontally turns is installed in front of the column 2, and a measuring device 6 is installed on the side of the table 5. The table 5 holds two works W via a jig 7, and switches both works W to a processing side position P and a setup side position Q by turning. The entire machining center is covered with a machine body cover (not shown), and an automatic door 8 is provided in front of it. A work loading device 10 for loading and unloading a work is installed outside the automatic door 8 between the pallet transfer device 9 outside the machine and the setup side position Q of the table 5.

The measuring device 6 moves the measuring head support 11 shown in FIG. 3 to move the workpiece W as shown by an arrow A in FIG.
The groove width of the key groove Wa is measured. The measuring head support 11 has a measuring head 12 that is inserted into the key groove Wa and blows air in the groove width direction, and the back pressure of the measuring head 12 causes the measuring device 6 to measure the groove width. The measuring head support 11 can move forward and backward, and when the measuring head 12 cannot enter the keyway Wa, the measuring head support 11
Runs backwards. This escape operation is detected by the releasing switch 13 and a measurement impossible signal is output.

In FIG. 2, an NC device 14 is a device for controlling the entire machining cell composed of a machining center, a work loading device 10 and the like, and comprises a numerical controller and a programmable controller. The programmable controller section is provided with machining / measurement sequence control means 15 including the sequence program of FIG.

A processing method having the above configuration will be described. First, an outline will be described. In FIG. 2, the pallet transfer device 9 causes the material work to flow to the front of the machine. After positioning a pallet (not shown), the work loading device 10 chucks the material work. Then, a work loading cycle is executed to chuck the material work W on the jig 7 at the setup side position of the table 5. After that, the table 5 is rotated 180 °, and the key groove Wa of the work W moved to the processing side position P is processed. Processing is.
Rough machining of keyway ,. Chamfering of key groove ,. The width of the keyway is finished in order.

While the work W at the processing side position P is being processed, a new work W is chucked by the jig 7 at the setup side position Q of the table 5, and when the processing is completed, the table 5 is moved to 180 °.
The machining of the workpiece W which has been rotated and moved to the machining side position side is started. During this processing, the width dimension of the key groove Wa of the processed work W at the setup side position Q is measured by the measuring device 6.

The processing is performed as follows according to the measurement data by the measuring device 6. a. In the case of “OK”, that is, when there is no error. In this case, the next work is not corrected. b. In the case of “+ OK”, that is, when the groove width is larger than the target value but within the tolerance. In this case, the minus correction is performed so that the groove width will be narrower for the next work. The correction amount may be a quantitative correction or a zero correction only according to the error amount. Which correction is to be performed can be switched by a parameter. c. In the case of "-OK", that is, when the groove width is smaller than the target value but within the tolerance. In this case, the next work W
, Plus correction is performed. The correction amount is the same as in the case of the negative correction described above.

D. In the case of “+ NG”, that is, when the groove width is larger than the target value and exceeds the tolerance. In this case, the alarm is stopped immediately before the finishing of the next work W. e. In the case of "-NG", that is, when the groove width is smaller than the target value and exceeds the tolerance. In this case, the work W measured this time is reworked and remeasured immediately before the finishing work of the work W next time.

F. In the case of relieving, that is, when the measuring head 12 (FIG. 3) of the measuring device 6 is not inserted into the keyway Wa and measurement becomes impossible. In this case, the alarm is stopped immediately before the finishing process of the work W next time. The finishing process of the work W is executed only when the measurement of the work is completed last time and it is determined that the correction is not necessary, or when the correction is necessary and the data is transferred to the offset means of the NC device 14. ..

Next, the processes a to f will be described with reference to FIG. When the processing of the nth work W is completed (S1),
The table 5 turns 180 ° (S2), performs rough machining and chamfering of the (n + 1) th workpiece W (S3),
The nth workpiece W is measured (S6).

In the case of OK, + OK, or -OK, the correction data is transferred to the offset means by the measurement data of the previous time (nth work) (S7). In the case of OK, zero data is transferred or correction-unnecessary data is transferred. Then, after finishing the rough machining and the chamfering, the finish machining of the (n + 1) th workpiece W is corrected by the offset value (S4). At the time of this finishing, unloading the (n + 1) th workpiece W is performed to
The second work W is loaded.

If the result of measurement of the n-th workpiece W in step S6 is -NG, the table 5 is set to 180.
It is rotated (S9), and the finishing work of the n-th workpiece W is performed (S10). At this time, finish processing is performed by correcting the measurement data of the previous time (nth work W). After that, the table 5 is turned 180 ° (S11), and the n-th workpiece W is remeasured (S12). The result of this measurement is OK, + O
In the case of K and -OK, the correction value is transferred to the offset means (S8) as in the above step S7, and the finish machining (S4) of the (n + 1) th workpiece W is performed.

As a result of the remeasurement in step S12,
In the case of NG and + NG, the alarm is stopped and an operator call is made (S13), and the operator manually intervenes to restart.

As a result of the measurement of the n-th workpiece W in step S6, if the result is + NG, reworking is impossible and the alarm is stopped, and an operator call (S13) is performed. If the result of measurement in step S6 indicates that measurement is not possible, alarm stop and operator call (S13) are performed. Such measurement and processing operations are repeated.

According to this machining method, since the previous work W is measured during the rough machining of the next work W, that is, simultaneous processing is performed, it is not necessary to spend time dedicated to measurement, and the cycle time is reduced. Shortened. Further, as a result of the measurement, when reworking is possible (in the case of -NG), the reworking is performed without discarding it as a defective product, so that waste can be eliminated.

In the above-mentioned embodiment, the case where the table 5 is the turning table has been described, but the present invention can be applied to the case where the table 5 is a slide table. Further, the present invention can be applied not only to the case of performing the groove processing but also to the case of performing various kinds of processing.

[0024]

According to the machining method of the machining center of the present invention, the machined workpiece at the setup side position is measured during rough machining of the workpiece at the machining side position on the table, and the necessary correction is made according to the measurement result. Since it is a method of performing and finishing, the measurement result can be reflected in the machining of the next work, the machining accuracy can be improved, and the cycle time is shortened without the time dedicated to measurement. .. Further, since the measurement is performed on the table inside the machine, when a processing defect that can be reprocessed occurs, it is possible to easily perform the reprocessing and save waste.

[Brief description of drawings]

FIG. 1 is a flow chart showing a machining method of a machining center according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram combining a schematic plan view of the machining center and a block diagram of a control system.

FIG. 3 is a schematic cutaway side view of the measuring device of the machining center.

[Explanation of symbols]

2 ... column, 4 ... spindle, 5 ... table, 6 ... measuring device,
10 ... workloading device, 12 ... measuring head, 1
4 ... NC device, 15 ... Machining / measurement sequence control means,
W ... Work, Wa ... Keyway

Claims (1)

[Claims] 1. A machining center equipped with a table on which a work is exchangeably installed on a machining side and a setup side, and a measuring device for measuring a machined work at a setup side position. Machining center characterized by measuring the machined workpiece at the setup side position during rough machining of the workpiece at the position and performing the necessary compensation according to the measurement result to finish the rough machining workpiece. Method.