JPH05127726A - Coordinate specifying method of nc machine - Google Patents

Abstract

PURPOSE:To apply the coordinate specifying method to a plate material bending machine and other general NC machines by accurately performing halfway actuation while using an easy-to-correct machining program which uses incremental feed commands. CONSTITUTION:This coordinate specifying method is applied when the machining program 14 which includes incremental feed commands (n3), (n6), and (n7) and absolute feed commands (n1) and (n2) is used. If a command which is started halfway is not the absolute feed command when this machining program 14 is started halfway, the absolute command retrieval means 17 of an MMC function part 12 retrieves a last absolute feed command first. Then an incremental command arithmetic means 18 calculates this last absolute feed command and following incremental feed commands up to the halfway started command and uses the arithmetic result as coordinate specification values at the time of halfway start.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for designating coordinates when a plate material folding machine, punch press, or other NC processing machine is started midway.

[0002]

2. Description of the Related Art Conventionally, in a plate material folding machine, as shown in FIG. 2, a plate material feeding device 51 feeds a plate material W into a holding die 52, and a portion Wa of the plate material W protruding from the holding die 52 is raised by a bending die 53. There are things that bend at the edges. When the plate material W is bent in multiple stages as shown in FIG. 3 using such a plate material bending machine, as shown in FIGS. 4A to 4E, bending and feeding of the plate material W is repeated, and Process sequentially.

The operation of the plate bending machine is generally performed by numerical control, and the machining program for the machining shown in FIG. 3 is as shown in FIG. 5, for example. In addition, A to C of FIG.
The dimensions of the bent portions are 20 mm, 10 mm, and 5 mm, respectively. The machining program of FIG. 5 is made up of instructions that are made into blocks, as shown by adding sequence numbers n1 to n7, and each block includes the type of instruction indicated by a four-digit number following the address “M” and the feed amount. A word that specifies the absolute value in millimeters (for example, "X500")
Composed of and.

According to the machining program of FIG. 5, by executing the command of n3 after the command of n2, the difference of the feed command values, that is, the feed of 500-490 = 10 mm is performed. Explaining with reference to FIG. 4, the operations (A) to (B) are performed. Further, by executing the commands from n3 to n5 of FIG. 5, the operations of FIGS. 4 (B) to (D) are performed, and the feed of 20 mm is performed.

[0005]

Here, when changing the dimension of the processed shape, for example, the bent portion of dimension B in FIG.
When changing to 1 mm, the machining program of FIG. 5 corrects the command portion of “X490” in the command of n3 to “X489”. At this time, if only the command of n3 is changed, the bending portion of the next 20 mm becomes 19 mm, so n5
The command portion of “X470” of the command of 1 must also be corrected to “X469”.

As described above, when the feed amount is designated by the absolute value, it is necessary to change the command at a plurality of locations in order to change the bending width at one location, which makes the modification of the machining program troublesome.

Therefore, it is conceivable that the machining program as shown in FIG. 6 is used together with the incremental feed command. In FIG. 6, “DX-1 in the command of n3
The command indicated by "0" or the like is an incremental command. If the incremental feed command is used in this way, when changing the dimension of B in FIG. 3 from 10 mm to 11 mm, the command portion indicated by “DX-10” in the command of n3 is changed to “DX-1
Only by changing to 1 ”, the program can be modified without affecting other commands.

However, in the case of a machining program including an incremental command, accurate positioning cannot be performed when the machining program is restarted from the middle after machining is interrupted. For example, if it is attempted to restart machining from the command n6 in FIG. 6, the incremental feed command "DX-2
Since "0" is executed, regardless of the current position, it will start from the position moved 20 mm from the current position. n
The command of 6 is originally a command to start from the position of X500-10-20 = 470, but if the position of the plate material shifts during the interruption of processing, 20 mm is used as a reference based on the shifted position.
I will move and start.

An object of the present invention is to provide a coordinate designating method for an NC processing machine, which enables accurate start-up on the way while using a machining program which is easy to modify using an incremental feed command.

[0010]

The method of the present invention will be described with reference to FIG. 1 corresponding to an embodiment. This coordinate specification method is
Incremental feed command (n3), (n6), (n
7) and absolute feed command (n1), (n2)
When the machining program (13) including the above is started midway, if the midway start command (for example, n6) is not the absolute feed command, the immediately preceding absolute feed command (n2) is searched first. The absolute feed command (n2) and the incremental feed commands (n3) and (n6) up to the subsequent half-start command (n6) are calculated, and the calculation result is used as the coordinate designation value at the middle start.

[0011]

According to this method, when the command to start machining is the incremental feed command, the immediately preceding absolute feed command is searched and the coordinate position to start machining is calculated. Therefore, machining from the middle of the machining program is performed. It becomes possible to perform with high accuracy.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIG. The plate material folding machine 1 is composed of a folding machine body 2 and a plate material feeding device 3, and the folding machine body 3 has an openable / closable holding die 4 for vertically sandwiching a plate material W and a holding die 4 for holding the plate material W. And a bendable mold 5 capable of moving up and down to push up the bent portion and bend the end.

The plate material feeding device 3 includes a C-shaped carriage 6
The plate material rotating device 7 for clamping the central part of the plate material W is provided at the tip of the carriage 6. The carriage 6 is installed on a rail (not shown) so as to be movable back and forth. It is driven back and forth by the motor 9. The plate material rotating device 7 rotates the plate material W by 90 ° or 180 ° so that each side of the plate material W can be fed to the bending machine body 2.

The NC device 10 is a means for controlling the entire plate feeding device 1, and includes an NC function unit 11, an MMC (Man Machine Controller) function unit 12, a machining program memory 13, and a programmable controller (not shown). )
It has and. The NC function unit 11 is the machining program 1
4 is executed by the arithmetic and control unit 15 to output the axis movement command of each axis to the servo controller 16 and to transfer the sequence control command of the machining program 14 to the programmable controller unit.

The MMC function section 12 is means for controlling the interface between the NC device and the operator, and as a part of the function means, an absolute command retrieval means 17 which operates in response to the start switch SW, and an incremental command calculation. Means 18 and. Both means 17, 18
The function of will be described later.

A machining program 14 whose example program is shown in the machining program memory 13 is a program that uses both the incremental feed command and the absolute feed command described above with FIG. 6, and in the operation process shown in FIG.
The command for performing the bending process of the shape of FIG. 3 is described.

Next, a method of designating coordinates at the time of midway activation will be described. When the machining program 14 shown in FIG. 1 is started midway, when it is started from the absolute feed command, it is started as it is, but when it is started from the incremental feed command, coordinate designation is performed as follows.

For example, when starting from the command block of n6, the absolute command searching means 17 sequentially looks at the data of the previous block one by one in the machining program 14 and searches for the immediately preceding absolute feed command n2. The incremental command calculation means 18 calculates the command value of each incremental feed command n3, n6 until the subsequent start up on the basis of the retrieved command value "X500" of the absolute feed command n2, and outputs the calculation result on the way. Use the coordinate specification value at startup. That is, in this example, X5
The processing is started from the value of 00-10-20 = 470.

Thus, according to this coordinate designating method,
While using the machining program 14 that is easy to modify using the incremental feed command, it is possible to accurately start the process on the way.

Although the above embodiment has been described for the case of being applied to a plate bending machine, the method of the present invention can be applied to a punch press and other NC processing machines in general.

Further, by processing offsets and the like, it is possible to process a program that could not be processed halfway until now. For example, in a turret punch press machine (so-called two-track punch press) having two rams that perform punching at different positions, the distance between punch positions depends on which ram value is used, even if the absolute value is the same. Only different work table position.
Even in such a case, it is possible to perform machining from the middle by performing the offset process according to the ram used. In addition, in various plate material processing machines, when the program includes a command for processing such as changing the gripping position of the plate material by the plate material feeding device, by performing arithmetic processing according to this command, Processing becomes possible. However, if the specified ram to be used or the gripping position change command is a relative command based on the state before execution of the command, the first used ram change command or gripping position change command in the machining program is traced back. It is necessary to search for it and calculate the subsequent commands.

[0022]

According to the coordinate designating method of the present invention, when the command to start machining is the incremental feed command, the immediately preceding absolute feed command is searched and the coordinate position to start machining is calculated. There is an effect that it is possible to perform machining from the middle with high accuracy while using a machining program that is easy to modify using a command together.

[Brief description of drawings]

FIG. 1 is a configuration explanatory view of a plate bending machine which is an NC processing machine to which a coordinate designating method according to an embodiment of the present invention is applied.

FIG. 2 is a partial side view of a conventional plate bending machine.

FIG. 3 is an explanatory diagram of a processing example by the plate material folding machine.

FIG. 4 is an explanatory view of a processing procedure by the plate bending machine.

FIG. 5 is an explanatory diagram of an example of a machining program of the plate bending machine using only an absolute feed command.

FIG. 6 is an explanatory diagram of an example of a machining program that uses both an incremental feed command and an absolute feed command of the plate bending machine.

[Explanation of symbols]

1 ... Plate material folding machine, 3 ... Plate material feeding device, 4 ... Clamping type, 5 ...
Musical type, 11 ... NC function part, 12 ... MMC function part, 14 ...
Machining program, 17 ... Absolute command retrieval means,
18 ... Incremental command calculation means, n1 to n7 ... Command (block), W ... Plate material

Claims (1)

[Claims] 1. When a machining program including an incremental feed command and an absolute feed command is started midway, if the midway start command is not an absolute feed command, the immediately preceding absolute feed command is searched for,
This is a method for specifying the coordinates of the NC processing machine, in which the absolute feed command and the incremental feed commands up to the subsequent mid-start command are calculated and used as the coordinate designation values during the mid-start.