JPS62260202A - Numerical controller - Google Patents

Abstract

PURPOSE:To omit the need for an operation to set the tool correction value by transferring the correction value of an existing value storage part newly to a present correction value storage part via a control part when tools are replaced. CONSTITUTION:When a parts is processed newly by a machine tool, the existing tool correction value is first supplied with no cut produced to a command input value storage part 2. This input value is stored in a present correction value storage part 2 and an existing value storage part 6. The wear of a tool caused during the processing is corrected by an automatic size correction method where the value of the part 2 is automatically corrected. While an external signal or the signal received from a control panel is supplied to a control part when a new tool is automatically replaced. Then the part 3 transfers the correction value of the part 6 corresponding to a designated number to the part 2. Thus the correction value of the replaced tool is updated to the value that causes not cut to the part 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a numerical control device for controlling a machine tool.

[Conventional technology]

Figure 3 shows a conventional numerical control device (hereinafter referred to as
FIG. 2 is a block connection diagram showing the NC device. In the figure, 1 is a command input section for machining commands.

2 is a current correction value storage unit that stores correction values for each of a plurality of tools; 3 is a control unit that controls the operation of each part of the NC device according to input from the operation panel or external signals; and 4 is a command value from the command input unit 1; A calculating section 5 determines an execution command from the tool correction value read out from the current correction value storage section 2, and a servo section 5 controls the operation of the machine tool.

Next, the operation will be explained. When machining is performed using a machine tool equipped with an NC device, it is necessary to correct errors in tool dimensions and mounting accuracy in order to improve the machining accuracy. For example, in the case of a lathe with an NC device,
The tool is attached to the machine tool, the operator calculates the necessary tool correction value from the trial cutting dimensions, and sets it on the control panel of the NC device. The tool correction value based on this setting is input to the current correction value storage section 2 and stored. Therefore, during machining, the coordinate values of the machining command from the command input unit 1 and the current correction storage unit 2
The calculation unit 4 calculates the tool correction value corresponding to the tool currently in use, which is stored in The servo section 5 is operated to obtain the necessary machining accuracy. On the other hand, if the tool wears out due to this machining, one operator can reset the tool compensation value or correct the tool compensation value using automatic dimension compensation, and the desired machining accuracy can be achieved in the same manner as above. It will be done.

Further, in preparation for cases where a highly accurate tool can be obtained by presetting or the like or when there is repeated machining, it is also possible to set the tool correction value using the command input section 1.

[Problem that the invention seeks to solve]

Since the conventional NC device is configured as described above, when a tool is replaced during continuous machining, installation of a new tool may cause cutting due to an error. In order to avoid this, one operator needs to set the tool compensation value each time a tool is replaced or a trial cut is made, and the machine also has an external NC device equipped with an automatic tool changer for new tools and an automatic dimension correction mechanism. Even with machine tools, the operator has to set tool correction values every time a tool is replaced, and these setting tasks can be cumbersome.

This invention was made in order to eliminate the above-mentioned problems, and it saves the labor of resetting tool correction, and in combination with an automatic tool changer or automatic dimension correction mechanism outside the machine, continuous unmanned operation is possible. The purpose is to obtain an NC device that can perform processing.

[Means for solving problems]

This invention inputs machining command values from a command input section, stores correction values regarding the tool currently in use in a current correction value storage section, and stores default values regarding correction in a default value storage section. The control unit stores correction values and default values for the tool from the command input unit or the operation panel into one or both of the two storage units, and further stores the specified number by external signals or input from the operation panel. The correction value in the default value storage section is transferred to the current correction value storage section.

The configuration is such that the calculation section calculates an execution command value for the machine tool based on the correction value and the machining command value.

[Effect]

The control unit in this invention transfers and stores the tool correction value input from the input unit or the operation panel to the current correction storage unit or the default value storage unit or both, and transfers and stores the tool correction value input from the input unit or the operation panel, and transfers and stores the tool correction value input from the input unit or the operation panel, and First, the control unit transfers the correction value of the specified number in the default value storage unit to the current correction value storage unit, updates the contents of the current correction value storage unit, and performs processing safely and automatically according to the updated contents. It acts to keep it going.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a simple embodiment of the present invention will be explained with reference to the drawings. 1st
In the figure, 1 is a command input unit, 2 is a current correction value storage unit that stores the current tool correction value, 3 is a control unit that controls the operation of each part of the NC device and data transfer, and 4 is a control unit that stores the command value and correction value. A calculation section 5 performs calculations, a servo section 5 controls the movement of the machine tool, and a default value storage section 6 stores default values for tool correction.

Next, the operation will be explained. Now, when trying to newly machine a part with a machine tool, first input a default tool correction value that does not cause gouge into the command input section 1, and then input this input value into the current correction value storage section 2 and the default value storage. 6 and 6, respectively. Then, tool wear that occurs during machining is corrected by automatically correcting the values in the current correction value storage section 2 by automatic dimension correction. In addition, if a tool exceeds its wear limit or is damaged, and the unusable tool is automatically replaced with a new tool outside the machine, a signal is input to the control unit 3 from an external signal or the operation panel. Then, the correction value of the specified number in the default value storage section 6 is transferred to the current correction value storage section 2 by the control section 3 . Therefore, the correction value of the replaced tool is updated to a value that does not cause gouge. As a result, after machining is restarted, the values in the current correction storage section 2 are corrected in the same manner as described above by automatic dimension correction, and the desired machining accuracy is obtained.

In the above embodiment, the machine tool is servo-controlled by calculating the correction value in the current correction value storage section 2 and the command value from the command input section 1. However, as shown in the second factor, The difference between the tool correction default value and the current correction value is stored in the current correction value storage unit 2, and the default value in the default value storage unit 6, the correction value in the current correction value storage unit 2, and the machining command value are stored. A similar effect can be obtained even if the three types of data are computed by the computing section 4.

In addition, in the above embodiment, automatic dimension correction and automatic tool exchange outside the machine were explained as examples, but even when these are performed by an operator, the above accuracy due to automatic machining can be ensured, and the labor required for tool exchange is This has the advantage of reducing errors and incorrect settings.

〔Effect of the invention〕

As described above, according to the present invention, when replacing a tool, the control section reads the correction value in the default value storage section.

Since it is configured to transfer and set new correction values to the current correction value storage unit, there will be no gouges even if machining continues, and from now on high precision machining with automatic dimension correction,
Machining can be performed automatically and smoothly, and in addition, the working time associated with tool exchange can be reduced, and erroneous setting of correction values can be prevented.

[Brief explanation of drawings]

FIG. 1 is a block connection diagram showing an NC device according to one embodiment of the present invention, FIG. 2 is a block connection diagram showing another embodiment of the invention, and FIG. 3 is a block connection diagram of a conventional NC device. . 1 is a command input section, 2 is a current correction value storage section, 3 is a control section, 4
5 is a calculation section, 5 is a servo section, and 6 is a default value storage section. In Figure 1, the same reference numerals indicate the same or equivalent parts. Patent applicant Mitsubishi Electric Corporation Representative Patent attorney 1) Hiroshi Sawa °
−″1 (2 others) −□

Claims (1)

[Claims] A command input section for inputting machining command values, a current correction value storage section for storing correction values regarding the tool currently in use, a default value storage section for storing default values for correction of the tool, and these current correction values. The correction values and default values for the above-mentioned tools input from the command input unit or the operation panel are stored in either or both of the storage unit and the default value storage unit, and the specified values are a control unit that transfers the correction value of the number default value storage unit to the current correction value storage unit, and an execution command value for the machine tool based on the correction value of the current correction value storage unit and the machining command value of the command input unit; A numerical control device equipped with an arithmetic unit that performs calculations.