JPS6232803B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a numerical control system, and particularly to a numerical control system that can effectively utilize memory within a numerical control device.

A numerical control device (hereinafter referred to as NC) sequentially reads machining data and performs predetermined numerical control processing based on the machining data to machine the workpiece according to the program.

By the way, the conventional method of inputting processing data was to punch a processing program in advance on a paper tape, and each time the numerical control processing based on the processing data of one block was completed, the processing data of the next block was read out with a tape reader. . However, since such a method does not allow high-speed numerical control processing, a method called memory operation has recently become mainstream. In this memory operation, a machining program recorded on an external storage medium such as a paper tape is stored in advance in a memory built into the NC, and machining data is sequentially read from the memory during numerical control processing. Such a memory operation method enables high-speed numerical control processing, but in order to store long machining programs, the memory capacity must be increased, resulting in increased costs.

Therefore, the present invention can effectively utilize memory.
In other words, it is an object of the present invention to provide a numerical control method that can store a larger amount of processed data in a memory with a limited capacity than before.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 and FIG. 2 are explanatory diagrams illustrating the outline of the present invention.

In FIGS. 1 and 2, 101 and 102 are a command area and a data area, respectively, which constitute the memory built into the NC. That is, the NC built-in memory has at least command area 101 and data area 1.
In the command area 101, machining commands (command 1, command 2, etc.) having a command form specific to the present invention, which will be described later, are stored, and in the data area 102, movement commands corresponding to various target positions or movement amounts are stored. Data (data 1, data 2...)
is memorized. Now, in the present invention, at least among the commands, commands related to movement have a specific form of X i (1) shown below. Here, alpha axis X indicates movement in the X-axis direction. still,
When moving in the Y and Z axis directions, the alpha
is replaced with Y and Z. Further, i is a numerical value indicating the memory position of the data area 102 that stores the amount of movement in the X-axis direction, and is called a data number. Now, data area 1 corresponding to data number 12 (Figure 2)
It is assumed that a movement amount of 100000 (μ) is stored in a predetermined location of 02, and a movement command of X12 is stored in a predetermined position of the command area 101. Assuming that each command is sequentially read out from the command area 101 as the numerical control process progresses, and the movement command X12 is read out from the command area at a predetermined time, the data specified by the data number is The numerical value 100000 stored in the memory location of area 102 is read out as the amount of movement in the X-axis direction. Also, movement command Y12
is read out from the command area, the numerical value 100000 stored in the memory location of the data area 102 indicated by data number 12 is similarly read out as the amount of movement in the Y-axis direction.

From the above, in the present invention, the movement command to move 100000μ in the X, Y, and Z axis directions does not need to be commanded as X100000, Y100000, and Z100000 as in the conventional case, but is commanded as X12, Y12, Z12, and the memory of data number 12 is 100000 in position
All you have to do is remember. What should be noted here is that the maximum value of the data number can be made sufficiently smaller than the maximum value of the actual movement amount. In particular, when commands for the same amount of movement occur many times during one machining process, in other words, if the following condition (2) is satisfied: size of command area > size of data area, data area 101 The number of data to be stored (types of movement amount) can be increasingly reduced, and the following relationship (3) holds true: Maximum value of data number << maximum value of movement amount. Now, assuming that the number of bits required to display the maximum movement amount is, for example, 32 bits, the number of bits necessary to display the maximum data number is, for example, 6 bits, and the same movement amount command is generated n times, the conventional The method and the method of the present invention each require the following numbers of bits to store the amount of movement. That is, the conventional memory operation method requires the number of bits of 32.n (bits) (4), and the present invention requires the number of bits of 6.n+32 (bits) (5).

From the above, in the case of n2, that is, if the same movement amount command occurs twice or more, 6・n+32<32・n (6), and the number of bits required by the method of the present invention is smaller than that of the conventional method. . The difference becomes larger as n becomes larger, that is, as the number of commands for the same amount of movement increases. In other words, it can be said that according to the method of the present invention, a large amount of processed data can be stored in a memory of the same capacity compared to the conventional method.

3 and 4 are other explanatory diagrams of the present invention in which transfer commands and calculation commands are provided in processing commands, movement data is changed by these commands, and position control is performed using the movement data after the change. .

In the figure, 101 is a command area, and 102 is a data area. Various processing commands are stored in the command area, and a plurality of target positions (numeric values) are stored in the data area. Among the machining commands, Xi (i=1, 2...) is a command related to the movement shown in equation (1) above, M□□ is an auxiliary function command for, for example, a hole punch, and Ri (i=1, 2...)
is the read transfer command, Wi (i = 1, 2...)
is a write transfer command, +i (i=1, 2,
…) is an addition operation command, Jk (k=1, 2,
) are branch program control commands, and the operand i of each command X, R, W, + indicates a data number. Now, read transfer command Ri
reads the target position (numeric value) from the memory location corresponding to data number i to the internal register, the write transfer command Wi writes the contents of the internal register to the memory location corresponding to data number i, and the calculation command +i reads the target position (numeric value) from the memory location corresponding to data number i. Reads the target position (numeric value) from the memory location corresponding to
Jk has the function of jumping to step number k and reading the next command from the kth step. Therefore, arrange each command as shown in Figure 3, and set data numbers 1 and 13 to 15000 (μ),
If 100000 (μ) is stored in each case, positioning and drilling at points P ₁ , P ₂ , P ₃ , P ₄ . . . are sequentially executed as shown in FIG. That is, as the numerical control process progresses, each command is sequentially read out from the command area, and when X13 is read out from the 19th step at a predetermined time, the data specified by the data number is read out using data number 13 as a key. The target position 100000 is read from the memory location of the area. As a result, a pulse distributor (not shown) executes a pulse distribution calculation based on this target position information, moves the workpiece (for example, an iron plate), and positions point _P1 directly below the punching head. After the positioning is completed, the hole punch auxiliary function command M□□ is read out and the punching press is controlled to form a hole _h1 at point _P1 . Next, by a read transfer command R13, using data number 13 as a key, a target position (numerical value 100000) is set in an internal register (not shown) from the memory location of the data area indicated by the data number. Thereafter, using the calculation command +1, the numerical value 15000 is read from the memory location of the data area indicated by the data number 1 using the data number 1 as a key, and added to the contents (100000) of the internal register.

Next, the calculation result (115000) is written to the memory location of data number 13 by the write calculation command W13, and finally the jump command J19 is executed.
The process returns to step 19, and the same operation is repeated thereafter, and holes are drilled at points P ₂ , P ₃ , and P ₄ one after another. Note that by using a conditional branch command, it is possible to proceed to the 25th step and subsequent steps after machining a predetermined number of holes.

As described above, by appropriately arranging program control commands such as transfer commands, calculation commands, jump commands, etc. in the machining program, the target position stored in the data area can be updated one after another to the desired target position. I can do it. In particular, when positioning and machining are repeated multiple times as shown in Figure 4, the number of commands in the machining program can be reduced, and in addition to the methods shown in Figures 1 and 2, memory It is possible to make effective use of memory, reduce memory capacity, and reduce costs.

As described above, according to the present invention, when the same amount of movement occurs repeatedly, the number of bits required to store the amount of movement can be significantly reduced compared to the conventional method. That is, compared to the conventional method, a large amount of processed data can be stored in a memory of the same capacity, making it possible to reduce the memory capacity and cost.

Furthermore, when positioning and machining are repeated multiple times as shown in FIG. 4, the number of commands in the machining program can be reduced, further reducing memory capacity and cost.

Although the above explanation deals with one axis at the same time, the present invention is not limited to one axis at the same time.
It can also be applied to two axes simultaneously. Further, various incremental values or absolute values can be stored in the data area.

[Brief explanation of the drawing]

FIGS. 1, 2, 3, and 4 are explanatory views for explaining the present invention, and FIGS. 1 and 2 are explanatory views for explaining movement control according to the present invention, and FIGS. FIG. 4 is another explanatory diagram of the present invention in which transfer commands and calculation commands are provided in processing commands, movement data is changed by these commands, and position control is performed using the movement data after the change. 101...Command area, 102...Data area.

Claims (1)

[Scope of Claims] 1. The memory is divided into a command area for storing at least a plurality of machining commands and a data area for storing movement data corresponding to various target positions or movement amounts, and the memory is divided into a command area for storing at least a plurality of machining commands and a data area for storing movement data corresponding to various target positions or movement amounts. A command is composed of an alphanumeric character indicating the movement direction and a data number corresponding to the memory location where the movement data is stored, and when a predetermined machining command is read from the command area, the command is read from the memory location corresponding to the data number of the machining command. In a numerical control method that reads movement data and moves a tool or table based on the movement data, read and write transfer commands and calculation commands that use data numbers as operands are provided as machining commands, and these commands are inserted into the machining program as appropriate. A numerical control method characterized in that the movement data stored in the data area is changed using these commands, and the changed movement data is used to move the tool or the table. 2. Reads the first numerical value from the memory location corresponding to the data number that is the operand of the read command among the transfer commands and stores it in an internal register, and reads the second numerical value from the memory location that corresponds to the data number that is the operand of the calculation command. The data to be moved is read out by reading a numerical value, performing a predetermined operation using the first and second numerical values, and storing the result of the operation in a memory location corresponding to the data number that is the operand of the write command among the transfer commands. The numerical control method according to claim 1, characterized in that the numerical control method changes: