KR0155745B1 - Automatic establishment method of 2 axis origin off set - Google Patents

Abstract

In the present invention, the automatic Z-axis offset amount setting method automatically constructs the height of the workpiece, the length of the tool, and the length from the bed to the spindle in a database, and then automatically inputs only the number of the workpiece and the number of the tool, and then the Z-axis origin offset amount automatically. By setting the, you can avoid the hassle of performing Z-axis offset every time you change the workpiece and tool.

Description

Automatic setting of Z axis origin offset amount

1 is a schematic structural block diagram of an apparatus according to the present invention.

2 is a schematic diagram showing numerical values for the origin offset.

3 is a flowchart illustrating the present invention.

The present invention relates to a numerical control method, and more particularly to a method for automatically setting the Z-axis origin offset amount.

Conventionally, after the homing, the operator installs the workpiece on the bed, puts the gauge on the workpiece, moves the Z-axis, and reads the position when the tool contacts the gauge from the position display of the position control device. The compensated Z-axis origin offset amount Zoff was input or changed. Therefore, every time the tool or workpiece changes, the above operation must be performed.

In particular, when the same workpiece is processed with different types of tools, the tool length Ht must be corrected each time the tool is changed and processed because the tool lengths Ht are different.

Accordingly, it is an object of the present invention to provide a method for automatically setting the Z-axis origin offset amount such that the top surface of the workpiece always has the origin of the Z axis even if the tool or the workpiece is changed.

In other words, by automatically setting the Z-axis origin offset amount when a tool is changed, the Z-axis coordinate system is newly set when the tool is changed, thereby providing an automatic setting method of the Z-axis origin offset amount without requiring a separate tool length correction. .

In order to achieve the above object, the present invention can establish a database of the height of the workpiece, the offset amount of the tool, and the length of the tool, and in the processing system having a temporary storage means, according to the height command of the workpiece A first variable selection process for setting the offset amount in an automatic mode and selecting, as a first variable, the height of the workpiece corresponding to the number of the workpiece from the database for the height of the workpiece and storing it in the temporary storage means; If there is no change of the tool, the height of the tool corresponding to the tool number is selected as the second variable from the database for the height of the tool according to the input of the tool number and stored in the temporary storage means and the end of the program is completed. A second variable selection process of returning to the first variable selection process if the determination is not the end; And if the tool has been replaced, it is determined whether the offset amount setting automatic mode is in progress, and if the automatic mode is in progress, the first variable and the second variable are read, the offset amount is calculated, and the previous offset amount is erased. And storing the amount, and returning to the second variable selection process if the automatic mode is not used.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic structural block diagram of an apparatus according to the present invention, and FIG. 2 is a schematic diagram showing numerical values of a machining system for the origin offset.

The apparatus according to the present invention includes a central processing unit 100, a ROM memory 102 in which a program for controlling a system is stored, a RAM memory 104 for storing data and processing results necessary for control and arithmetic processing, and a machine. I / O (Input / Output) circuit 108 for interfacing with 110, position control device 114 for controlling servomotor 118, servo control unit 116, key input unit 106 for input , And the display device 112.

In FIG. 2, which is a schematic illustration of a machining system, the tool 202 is used by being fitted to the spindle 200, and the workpiece 204 is placed on the bed 206 and processed.

Variables used in the present invention include the height Hbs from the bed 206 to the spindle 200, the height Hm of the workpiece, the length Ht of the tool 202, and the Z-axis origin offset amount Zoff. There is this.

3 is a flowchart for explaining the present invention, which will be described below in conjunction with FIGS. 1 and 2.

First, in order to automatically set the Z-axis origin offset amount, data such as the tool offset amount, the height of the workpiece, and the distance between the bed and the spindle must be measured and stored in the database.

When the database is built as above and programmed in three blocks as below,

(1) In the case of block, the automatic setting function of Z axis is valid and the workpiece height No. 2 corresponding to the commanded value of P is designated.

(2) In the block, the tool is placed in the standby port by the T command, and the tool length offset number corresponding to this value is designated.

(3) Tool change is made on the block. That is, the tool 202 of the spindle 200 is replaced by the standby port, and the tool at the standby port is replaced toward the spindle 200. At the same time, the Z-axis origin offset amount is determined by the workpiece height Hm specified in the blocks (1) and (2), the length of the tool (Ht), and the distance between the spindle 200 and the bed 206 registered in the parameter. Zoff) is calculated as

This calculated value becomes the new Z axis origin offset value of the currently selected Z axis coordinate system.

Looking at the flow of operation according to the present invention step by step.

The CPU 100 reads (1) the block from the numerical control program (step 300) and determines whether G54.2 is commanded. (Step 302)

If commanded, set AUTOSET to 1 to enable the automatic setting of the Z-axis origin offset amount. (Step 304) After that, it is determined whether there is a P command indicating the workpiece height (step 306), and if there is no command, the workpiece number is automatically assigned to 1 (step 308), and if there is a command, the workpiece number corresponding to the commanded number is entered. Is specified. (Step 310)

If G54.2 is not commanded, determine whether there is a tool change command M_. (Step 312) If commanded, it is determined whether AUTOSET is set to 1 (step 320). If it is set to 1, the RAM memory 104 determines the tool length (Ht) corresponding to the tool number and the number of the workpiece. Read the height of the workpiece (Hm). (Step 322)

Thereafter, the Z-axis origin offset amount is calculated as follows. (Step 324)

Zoff = Hbs-Ht-Hm

Then, the currently selected Z-axis origin offset amount is changed. (Step 326)

If the result of step 312 is negative and after step 326, it is determined whether there is a T command (step 314), and if there is a T command, a tool length offset number corresponding to the command value is assigned to the tool number. (Step 316)

T command and M_ (tool change) by inputting the workpiece height, the distance between the spindle and the bed, and the length of the various tools for the various workpieces you want to machine in advance into the corresponding database and commanding G54.2 P_ at the beginning of the program. Automatically change the Z-axis origin offset of the selected Z-axis coordinate system at the time of command so that the top surface of the workpiece is always the Z-axis origin on the Z-axis coordinate system.

Therefore, in the present invention, the automatic Z-axis offset offset setting method automatically constructs the height of the workpiece, the length of the tool, and the length of the bed to the spindle in a database, and then automatically inputs only the number of the workpiece and the number of the tool, and then automatically sets the Z-axis origin. By setting the offset amount, you can eliminate the need to perform Z-axis origin offset every time you change the workpiece and tool.

Claims (2)

In the processing system having a temporary storage means, a database can be constructed for the height of the workpiece, the offset amount of the tool, and the length of the tool, and the offset amount setting is set in the automatic mode according to the height command of the workpiece and the workpiece A first variable selection process of selecting, as a first variable, the height of the workpiece corresponding to the number of the workpiece from the database for the height of the workpiece; If there is no change of the tool, the height of the tool corresponding to the tool number is selected as the second variable from the database for the height of the tool according to the input of the tool number and stored in the temporary storage means and the end of the program is completed. A second variable selection process of returning to the first variable selection process if the determination is not the end; And if the tool has been replaced, it is determined whether the offset amount setting automatic mode is in progress, and if the automatic mode is in progress, the first variable and the second variable are read, the offset amount is calculated, and the previous offset amount is erased. And an offset amount setting process for returning to the second variable selection process if the amount is stored in an automatic mode and not in the automatic mode. The method according to claim 1, wherein the offset amount is calculated by subtracting the height of the workpiece and the height of the tool from the height of the body to which the tool is inserted to place the workpiece.