JPS58117002A - Tool offset system - Google Patents

Abstract

PURPOSE:To perform tool offset control, by storing the amount of offset of the tool having >=N of tool number, by means of the storage of the amount of offset and the tool number to an offset memory. CONSTITUTION:When a shift command is given, an operation processing section 104 operates incremental values DELTAXa, DELTAYa, DELTAZa of axes and input the result to a pulse distributor 107. The pulse distributor 107 executes the operation of pulse distribution based on the incremental values DELTAXa, DELTAYa, and DELTAZa, outputs distribution pulses XP, YP and ZP, which are inputted to servo circuits 108X, 108Y and 108Z to shift the tool along the command path. Further, the section 104 reads out the tool length offset amount from the storage area of the offset memory 106 corresponding to the tool number next to the alphabet H, correct the incremental value Z and gives outputs to the pulse distributor 107.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tool offset method, and relates to a tool offset method suitable for application to tool length offset, tool position offset, tool radius offset, etc. in numerical control.

A numerically controlled machine tool moves a tool or a table along a commanded path in response to commands given from a numerical control device, and performs the commanded machining on a workpiece by 1j/A.

NC' program 2m such as polling, cod pink machining, etc. is a tool with a standard tool length (standard tool).
It is created with the assumption that If this rounding is performed using a machine with different reference tools and the same NC program, a machining error will occur in the depth of the hole due to the difference in tool length.

Therefore, normal NC devices have a tool length offset function to prevent machining errors caused by different tool lengths. That is, the offset memory built into the NC device stores the deviation (offset amount) between the tool length of each tool and the tool length of the reference tool in advance for each tool, and stores the offset corresponding to the tool used during actual machining. Specify the amount, and the second middle part is programmed to add or subtract the movement command value of the 92 axes, and perform machining based on the difference in tool length.
4 to prevent the difference and 3. The offset amount is set in the offset memory by inputting the offset number and the offset amount corresponding to the offset number from a manual data input device (MDI). Also, whether to add or subtract the offset amount is specified by G function command 94S (addition) or G44 (subtraction)), and it is done by the offset number following the predetermined offset amount (DJI selection is Alphabella). It's K.

On the other hand, in processes such as slicing, the final machined shape is defined by an NC program. For this reason, during actual machining, it is necessary to perform the machining by offsetting the command path by one centimeter by the tool diameter. Normally, the NC device has a tool radius correction function, so that machining can be performed according to the command even if the same program is used and tools with various tool diameters are used for machining. That is, the tool diameter (offset amount) of each tool is stored in the offset memory in advance along with the offset number, and during actual machining, the offset number that follows DK is commanded by the program. A CM is output from the offset 1it-offset memory corresponding to the offset number, and the movement path centered on the tool is offset by only the offset cover, thereby performing machining as instructed. It should be noted that whether to offset to the left in the tool advancing direction or to offset by 1 flK to the right is specified by the G function command G41 (left offset) %642 (right offset).

As described above, the conventional NC device is designed so that machining can be performed according to commands using the same NC program even if the tool length or tool diameter is different.

By the way, in a conventional NC device having such an offset function, the storage area of the offset memory is, for example, 52.
If there is only the equivalent of a book's tools, it is only possible to set offset numbers from 01 to 32. In other words, in the conventional offset method, if the offset memory only has a storage area equivalent to a tool of 324 m1, arbitrary s2 numbers can be set as offset numbers, for example, 1°? , 18.123.124.12? , 212・
...I couldn't sleep because I could choose any 32 offset numbers like 915. This is because in the conventional method, the storage area of the offset lid of the offset memory is fixed in advance for offset numbers 01, 02...32.
This is due to the fact that

For example, when machining is performed using a tool corresponding to tool offset number 100, the storage capacity of the offset memory is required to store the offset amounts of 100 tools. In other words, the machine tool is N
When performing NC machining while automatically changing tools, in the conventional tool offset method, if the maximum tool offset number among N tools is M (MAN), the offset memory is determined by the maximum tool number. Feet and capacity were required to store M tool offset amounts. As a result, the cost of the NC device (which has a large off-cell capacity) increases.

Therefore, the present invention provides a tool offset method that allows offset lids of N tools having arbitrary numbers as offset numbers to be stored even when the offset cap has a capacity equivalent to N tools. The purpose is to provide

Hereinafter, embodiments of the present invention will be reviewed according to one embodiment.

The figure is a block diagram of an embodiment of the present invention. Reference numeral 101 is a paper tape, on which NC data is perforated.

102 is a paper tape reader, 105 is a paper tape reader 10
a decoder that decodes the NCC data read from 2;
104 F'i performance 8 MA@, 105 is Mani JIL
7)k.

Data input device (MDII, 106 is a tool offset number, an offset memory that stores the correspondence between the !knee and 7 set warehouses, 107 is a pulse distributor, TOAZ.

Reference numerals 108Y and 1082 are the circuits for each axis.The tool offset number of the tool to be used and the offset amount of the blank tool are input in advance from the MD 1105 and stored in the offset memory 106. In addition, offset memory 10
6 only has a memory capacity equivalent to s2 tools, and the tool number A#r to be used is 1. ?・18/12 violence.

124, 129.212...915. When setting the offset amount to the offset memory 106, M
Press the offset button on DI105 to enter offset setting mode, then set offset number 1 and offset setting mode.
If you input ZOF (001) and press - during input, the offset number and offset amount will be stored in the offset memory 10.
4K stored. From then on, use offset numbers 9 to 91 in the same way.
Store the offset amounts up to 5 in the offset memory.

After setting the offset amount, the paper tape reader 102 is activated, NC data is read one block at a time from the blank tape 101, and the numerical position control process is started. When a movement command is given, the arithmetic processing unit 104 calculates the incremental movement of each axis ΔXs, ΔYa.
lΔZl is calculated and input to the pulse distributor 107.

The pulse distributor 107 has an incremental pulse ΔxayΔY
All pulse distribution calculations are executed based on llΔZaK and distribution pulses XP, YP, and ZP are output, and each axis surf circuit 10
8X, 108Y, and 1082 to move the tool along the commanded path. On the other hand, when the arithmetic processing unit 104 inputs 9, for example, G43 H1254G, it retrieves the tool length offset cover ZOF (12! The Z-axis incremental value Δ2 is corrected to ΔZ+ZOF(123) −*jZ' and output to the pulse distribution 86107. As a result, the pulse distributor 107 outputs the corrected incremental value Δ
A number of distribution pulses zp' corresponding to Z' are generated to correct the tool position in the Z-axis direction. Also, for example, G44 H9
15 compensation is commanded, the arithmetic processing unit 104 continues with the alphabet H (offset memory 10 corresponding to tool number 915).
The tool length offset amount ZOF (915) is read from the storage area 6, the Z-axis incremental value Δ2 is corrected to ΔZ - ZOF (915) - +jZ', and the corrected incremental tooth Δz1 is output to the pulse distribution 5107. . From this K, the pulse distributor 107 generates a number of distribution pulses zp# corresponding to the corrected incremental -ΔZ' and corrects the tool position in the Z-axis direction.

As described above, according to the present invention, since the tool number llr is stored in the offset memory together with the offset amount, even if the offset memory only has a capacity corresponding to N tools, the offset amount of the tool with the tool number N or more is can be stored and tool offset control can be performed. According to the present invention, during processing, a capacity corresponding to the maximum number of man-hours required is required, and the memory capacity can be significantly reduced, thereby reducing the cost of the NC device.

[Brief explanation of the drawing]

The figure is a block diagram showing an embodiment of the present invention. 101... Paper tape % 102... Paper tape reader, 103... Decoder, 104... Arithmetic processing unit, 10
5...MDI. 106...Offset memory, 107...Pulse distributor, 108X, 108Y, 1082.? −E circuit. % Client: Fujitsu Fanuc Co., Ltd. Agent, Patent Attorney Tsuji, 2 people

Claims (1)

[Claims] The offset amounts of multiple tools are stored in the offset memory in advance, and the predetermined offset amount is used as a countdown from the offset memory to correct the large movement data, and the tool position is corrected based on the large movement data. *In the tool setting method 2 for t-correction, the offset number is stored together with the offset amount in the offset camera, and by commanding a predetermined off layer y) arrival number, the offset amount corresponding to the offset number is calculated. A tool offset method characterized by reading out the commanded movement data and correcting the commanded movement data.