JPH0631588A - Repetitive machining method work nc machine tool - Google Patents

Abstract

PURPOSE:To facilitate the composition, check and correction of a program, by installing a repeating means which calls out one working program in the main programs and repeats the called-out working program by the number of times of the quantity of the works. CONSTITUTION:A main program having a working program for working a workpiece 12 on an A surface by each of a plurality of tools T1 through carrying out the replacement of tool is set. Then, the first working program is called out, and a repeating means for repeating the called-out working program for the works 12 on the A-D surfaces is installed. A continuous working means which performs the replacement to the second tool by a tool replacement instruction according to the completion of the execution of the repeating means, calls out the next working program, and executes the repeating means by the called- out working program is installed. The workings for the works 12 on the A-D surfaces by these tools are carried out by executing the work by the fourth tool of the continuous working means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for uniformly machining workpieces mounted on a plurality of faces of a multi-sided block placed on a table in an NC machine tool according to a predetermined program.

[0002]

2. Description of the Related Art Generally, a workpiece mounted on a plurality of faces of a multi-sided block placed on a table as shown in FIG. 3 or 4 is shown in FIG. 5 (showing faces machined by tools T1 to T4) by an NC program. As shown, there are two methods for machining with a plurality of tools. For example, a 4-sided block (A)
As an example of machining four workpieces mounted on the (D) surface with each of the tools (T1) to (T4), one is machining one workpiece with each tool as shown in Table 2. After this, it is a method of moving to the processing of the next work. The other is a method in which, as shown in Table 3, the work on each surface is machined by the same tool and then the machining is carried out by the next tool.

[0003]

Here, the time required for tool exchange is (a) and the B-axis turning time of the table required to move to the next surface is (b), which is required for machining four workpieces. When the total of each time is calculated (ignoring the time of machining with a tool), the former method requires (16a + 4b) time, and the latter method requires (4a + 16b) time. Then, when the difference between the two is calculated,

[Equation 1] Becomes Here, since the tool change time is longer than the B-axis turning time, (a> b) 12 (ab)> 0, and it can be seen that the former method takes longer than the latter method. However, in the latter method, although the machining time is short, it is not easy to create a program because it is necessary to create a program for each tool and make them into a series of programs. Further, if a correction portion occurs in the program, even if there is only one correction portion, the whole program is corrected, so that it is not easy to correct or check. On the other hand, in the former method, although the machining time is long, it is only necessary to create a program for machining one work and repeat it for the number of works, so that the program is easy to create. As described above, there are merits and demerits to both, and the present situation is that the user selects one of them according to the situation and performs processing.

[0004]

Therefore, the present invention solves various problems in the conventional method, and provides a machining method of a work which can easily create and modify a program and can shorten the machining time. To do. That is, the configuration means a main program setting means for setting a main program having a machining program for machining a workpiece with a plurality of tools while exchanging the tool, and calling a machining program in the main program. Repeating means for repeating the called one machining program by the number of workpieces and tool exchange according to the end of execution of the repeating means, calling the machining program next to the one machining program, and calling the called machining program. A continuous machining means for executing the repeating means by a program is provided, and the continuous machining means is executed in accordance with the number of tools, thereby machining the plurality of works with a plurality of tools.

[0005]

In the main program having the respective machining programs set by the main program setting means for machining one workpiece with each tool while exchanging the tool, one machining program is called, and the called one is called. All the workpieces can be machined by the one tool by the repeating means for repeating the machining program of (1) by the number of workpieces. Further, the tool is exchanged in response to the end of execution of the repeating means, the machining program next to the one machining program is called, and the repeating means is executed by the called machining program. All workpieces can be processed with tools. Then, by executing the continuous machining means in accordance with the number of tools, it is possible to machine the plurality of works with a plurality of tools. Therefore, it is not necessary to create as many programs for machining multiple works with one tool as there are tools, and it is only necessary to create a program for machining one work with multiple tools. is there. Also, the processing time can be shortened.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Table 1 is an explanatory diagram showing a method of repeatedly machining a workpiece in an NC machine tool according to the present invention, FIG. 1 is an explanatory diagram of an apparatus using the present invention, FIG. 2 is a flow chart of the present invention, and FIG. The work (12) is shown attached to each surface of a four-sided block (10), which is an example of a multi-sided block placed on a table (11), and (T1) indicates a tool. Hereinafter, the present invention will be described by taking as an example the case where each work of the four-sided block is processed by the tools (T1) to (T4). In Figure 1 (1)
Is an input device for inputting the turning angle of the table (hereinafter referred to as the B-axis angle) or the like as parameter data by a manual operation such as a keyboard or a perforated tape.
Reference numeral (2) denotes a first memory that receives and stores the data output from the input device, and that moves the stored data to a second memory described later according to a predetermined command. (4) indicates an NC main unit, a machining program execution circuit (hereinafter referred to as an execution circuit) (4a) and a tool change command circuit (4b)
Composed of. The work on the A side is firstly placed on the execution circuit (4a).
A main program having machining programs 1 to 4 for machining with the tool (T1) to the fourth tool (T4) is set. (3) is the second memory that inputs and stores the data moved from the first memory (2), and (5) stores the start point of the sequence by the point memory command output from the execution circuit (4a) Sequence start point memory (hereinafter referred to as point memory),
(6) inputs the present value of the B-axis angle output from the execution circuit (4a) and the B-axis data output from the second memory (3), calculates the difference between both data, and A subtraction circuit that outputs a corresponding predetermined signal to the next-stage first determination circuit (7), and (7) is a sequence point search command (hereinafter referred to as a sequence point search command to the point memory (5) according to the signal output from the subtraction circuit.
(8) is a tool detection circuit that detects whether or not there is a tool on the spindle, and (9) is a second
It detects that no data is stored in the memory (3), inputs the signal of "tool present" from the tool detection circuit (8), and stores the B-axis data stored in the first memory (2). The second decision circuits for deciding whether or not to move to the second memory (3) are shown.

Next, the operation of the present invention when processing each work will be described. First, the B-axis angle required for each of the surfaces A to D to rotate to the processing position is set, and the set value is stored in the first memory (2). Then, the main program is started, but at this time, as shown in the flow chart, it is judged whether or not the sequence return, which is the operation when machining is interrupted (NC reset) and machining is restarted midway, If it is returning, the return is executed as it is. When the return is complete, the tool detection circuit (8) detects whether or not there is a tool (T1) on the spindle, and if it is detected that there is a tool, the "tool present" signal is sent from the tool detection circuit (8) to the 2 B-axis data in the second memory on condition that it is output to the judgment circuit (9) (table (11) required for the work on the B side to reach the machining position when the work on the A side is in the machining position) The turning angle) is stored in the second determination circuit, and when it is determined that the stored rotation angle is stored in the second determination circuit, the second determination circuit executes the execution circuit (4a).
A search command, that is, a command for searching a sequence start point (hereinafter referred to as a start point) for machining by the machining program 1 is issued, and a point memory command is issued from the execution circuit to the point memory (5). The starting point is stored in the point memory. Then, the machining program 1 is executed, and the work on the A side is machined by the tool (T1). If the second determination circuit determines that there is no tool, the signal indicating no tool is output by the second determination circuit.
Output from (9) to the tool change command circuit (4b) to execute the tool change. Further, when it is determined that the data is not stored in the second memory (3), the first determination is made by the second determination circuit.
A data transmission command is issued to the memory (2), and the B-axis data stored in the first memory is moved to the second memory. Next, when the execution of the machining program 1 is completed, the table turns based on the B-axis data stored in the second memory,
The work on side B reaches the processing position. Then, from the point memory (5) to the execution circuit (4a), a command to return the sequence to the starting point (hereinafter referred to as a return command) is issued, and the main program returns to the starting point of the machining program 1, The machining program 1 is executed in the same manner as above,
The work on the B side is processed by the tool (T1). This is the repeating means. Thereafter, the works on the C and D faces are similarly processed by the repeating means based on the processing program 1.

Next, when the execution of the repetitive machining means is completed and there is a replacement instruction (M06) to the tool (T2), the second memory
The current B-axis data in (3) is erased, but at this time, if the B-axis data representing unprocessed by the tool (T1) remains in the second memory, it is stored in the point memory (5). The process returns to the stored starting point and the unmachined part of the work is machined by the tool (T1). If there is no B-axis data in the second memory, a replacement command for the next tool (T2) is executed and the data stored in the first memory (2) is moved to the second memory. . At this time, it is determined whether or not the end of program (M02) or end of tape (M30) command has been issued, and if it is determined that those signals have not been issued, the main program Is a tool
The machining program for the A-side workpiece by (T2), that is, the machining program 2, is advanced to the position where the machining program 2 is started, and the current sequence at that time is stored in the point memory (5) as a new starting point. Then, the work from the surface A to the surface D is processed by the repeating means based on the processing program 2. In this way, the continuous machining means is to repeat the repeating means based on the machining program. Then, similarly, use the tool (T
By executing the continuous machining means based on 3) and (T4) respectively, machining of all workpieces is completed. Then, when a pallet change command (M60) is issued, the point memory becomes 0
When cleared, the pallet is replaced and the next pallet is processed. If an end of program (M02) or end of tape (M30) command is issued, the program ends. Here, if the NC machine tool is reset during program execution, the sequence is restored, but since the machining continues from the surface that was being machined at the time of resetting, even if a tool change command is issued, it will still be stored in the first memory. The data is not moved to the second memory. As described above, the tool (T1) ~
By (T4), it is possible to machine the work up to the D side by setting only one program to machine the work on the A side.

Even in the case of a work attached to each surface of the two-sided block as shown in FIG. 4, by newly setting a main program for the two-sided block and setting new B-axis data, It can be processed in the same manner as described above. Also, other blocks having a plurality of surfaces can be similarly processed using the present invention.

[0010]

According to the present invention, it is not necessary to create a program for sequentially machining a plurality of works by one tool for each tool, and a program for sequentially machining one work by a plurality of tools is provided. Just create one. Therefore, it is easy to create, check and modify the program. In addition, since each work is machined with the same tool while rotating the table, the machining time can be shortened. As described above, by using the present invention, it is possible to achieve both facilitation of program creation and reduction of machining time.

[Brief description of drawings]

FIG. 1 is a block diagram of the present invention.

FIG. 2 is a flowchart of the present invention.

FIG. 3 is an explanatory diagram showing a state in which a work is attached to each surface of a four-sided block.

FIG. 4 is an explanatory diagram showing a state in which a work is attached to each surface of a two-sided block.

FIG. 5 is an explanatory diagram of a processed work.

[Explanation of symbols]

1 ... Input device, 2 ... First memory, 3 ... Second memory, 4 ... NC main device, 4a ... Machining program execution circuit, 4b ... Tool change command circuit, 5 ... Sequence start point memory , 6 ... Subtraction circuit, 7 ...
・ First judgment circuit, 8 ・ ・ Tool detection circuit, 9 ・ ・ Second judgment circuit, 10 ・ ・ 4 block, 11 ・ ・ Table, 12
..Work pieces, 13-sided blocks, A, B, C, D
・ Work mounting surface, T1 ・ ・ Tool, M06 ・ ・ Tool change command, M60 ・ ・ Pallet change command, M02 ・ ・ End
Of Program Directive, M30 ... End Of Tape Directive.

[Table 1]

[Table 2]

[Table 3]

Claims (1)

[Claims] 1. A method for repeatedly machining a workpiece in an NC machine tool, wherein a plurality of workpieces mounted on a plurality of surfaces of a multi-sided block on a table are subjected to the same machining by rotating the table with a plurality of tools. Main program setting means for setting a main program having each machining program for machining each workpiece with a plurality of tools while exchanging tools for a work, and calling one machining program in the main program, and calling the one machining program , Repeating means for repeating the number of workpieces, and tool exchange according to the end of execution of this repeating means,
By providing a machining program next to the one machining program and providing a continuous machining means for executing the repeating means by the called machining program, the continuous machining means is executed according to the number of tools, thereby A method for repeatedly machining a workpiece in an NC machine tool, characterized in that the workpiece is processed by a plurality of tools.