JPH10143229A - Machine tool controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continue proper working through a simple operation when working is interrupted at a machine tool such as a counter two-axis lathe. SOLUTION: This device is provided with control means 35A and 35B for controlling a machine tool 1 by executing working programs 37A and 37B composed of plural process programs 52A-54A. Reloading commands 55A-57A are provided for overwriting the distinguish data of work state on a prescribed storage part 38 after the process programs 52A-54A. The control means 35A and 35B have condition judging means 51A for discriminating the stored data in the storage part 38 and starting the execution from any correspondent one of process programs 52A-54A when starting executing the working programs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine tool control device for controlling various machine tools, for example, an opposed two-axis lathe, by a machining program.

[0002]

2. Description of the Related Art The operation of a numerically controlled machine tool or a machine tool constituting a machining cell together with a transfer device is controlled based on a machining program stored in an NC device. The machining program is usually composed of a program for a plurality of steps. For example, in the case of a facing two-axis lathe, there are a machining program for the left spindle and a machining program for the right spindle. The left machining program is a material work loading process, an actual machining process, and a delivery to the right spindle (so-called kissing). Process. The machining program for the right spindle is a workpiece delivery process (kissing process) that receives a workpiece from the left spindle,
It consists of the actual machining process and the unloading process of the completed work. During execution of such a machining program, it may be necessary to temporarily suspend the machining due to various obstacles or circumstances. In such a case, simply pressing the start key causes the machining program to be executed from the beginning, so that, for example, there is a problem that the work is carried in despite the work remaining on the main spindle. Therefore, in order to resume machining, the operator visually checks the work state of each spindle, looks at the program list of machining programs displayed on the screen of the operation panel, finds the corresponding program location,
After setting the cursor, pressing the start key restarted machining.

[0003]

However, the work of searching for the relevant program portion by looking at the program list displayed on the screen as described above is extremely troublesome and requires skill. In addition, it may be difficult for an operator to visually determine whether or not the work held by the spindle is in a processed state.

[0004] An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a machine tool control device capable of continuing appropriate machining with a simple operation when machining is interrupted.

[0005]

The structure of the present invention will be described with reference to FIG. 3 corresponding to an embodiment. This machine tool control device includes control means (35A, 35B) for controlling a machine tool (1) by executing a machining program (37A, 37B) composed of a plurality of process programs (52A to 54A). The control means (35A, 35B) changes the state of the machine tool (1) to any of the process programs (37A, 37B) before the execution of the process programs (52A to 54A). 52A ~
A condition judging means (51A) for judging whether the state corresponds to 54A) and executing the process program from the corresponding process program (52A to 54A). According to this configuration, when the execution of the machining program (37A, 37B) is started, the state of the machine tool (1) is changed to any of the process programs (52).
A to 54A), a condition determining means (51)
A) determines the corresponding process program (52A to 54A).
Execute from A). Therefore, the operator does not need to visually check the state of the machine, and can continue appropriate machining by a simple operation of merely giving an execution command by operating the start key or the like.

In the above configuration, the machining program (37
A, 37B) are the process programs (52A to 54A)
At the end of the process, the work state discrimination data (0, 1, 2,
It is preferable to have a rewrite command (55A to 57A) that overwrites (3, 4) in a predetermined storage unit (38A, 38B). In this case, the condition determining means (51A)
Is stored in the storage unit (38) in accordance with a work state determination command described in a portion preceding a description portion of the first process program (52A) of the machining program (37A, 37B).
A, 38B) work state distinction data (0, 1, 2,
Read the corresponding process program (52A-5)
Execution is shifted to 4A). As described above, at the end of the process of each process program (52A to 54A), there is a rewrite command (55A to 57A) and the predetermined storage unit (38A, 3A).
Since the work state discrimination data of 8B) is rewritten, any interruption during the execution of the machining programs (37A, 37B) does not hinder the subsequent work state determination.
As a result, the process program (5
2A to 54A). Further, as described above, each process program (52A to 5A)
4A) Work state rewrite command (55A to 57A)
And a work state determination command (51A) at the beginning of the machining program (37A, 37B) is sufficient, so that a general-purpose machining program can be used and there is no need to construct a special machining program.

Further, in these configurations, the control means (35A, 35B) includes the condition determination means (51
Process program (53A, 5A) corresponding to the judgment result of A)
It is desirable to jump the program execution toward the fixed sequence number described in the execution start line of 4A). In this way, by making the sequence number of the start line of each process program (53A, 54A) that jumps and starts execution after the above-described determination impossible to change,
Even if maintenance such as a change in the contents of the process program (52A to 54A) is performed, a program error can be prevented, and the maintenance work of the program can be easily performed. Further, it is not necessary to define the work state confirmation command (51A).

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a plan view of a machining cell in which an opposed two-axis lathe 1 and a work transfer device 2 are combined as a machine tool to which the machine tool control device is applied. The lathe 1 has a pair of opposed main shafts 3A, 3B, and each main shaft 3A,
A pair of turrets 4A and 4B which are tool posts corresponding to 3B
And a turret lathe having These left main shaft 3A
And left processing part (first processing part) 1A with turret 4A etc.
The right spindle (3B) and the turret (4B) constitute a right processing section (second processing section) 1B. Double spindle 3
A and 3B are spindle chucks 5A and 5B for gripping a work.
And is supported by the headstocks 6A and 6B. Each spindle 3
A and 3B are rotationally driven by C-axis servo motors 39 and 40 (FIG. 3). A headstock 6A of one of the spindles 3A (left side in the figure) is mounted on a rail 7 so as to be movable in the axial direction (X-axis direction) of the spindle 3A. Headstock 6A
Is moved by an X-axis servomotor 9 via a feed screw 8.

A turret 4A on the left side corresponding to the main spindle 3A on the movable side is directly mounted on a turret carriage 10A movable in a direction (Y-axis direction) perpendicular to the axial direction (X-axis direction). 10A is driven forward and backward by a Y-axis servomotor 12 via a feed screw 11. By moving the turret carriage 10A back and forth, the tool 1
3 is performed, and the axial feed of the tool 13 is performed by the headstock 6.
This is performed by moving A. Since the right turret 4A corresponding to the fixed main spindle 3B needs to move in two orthogonal axes directions,
The turret carriage 10B movable in the Y-axis direction
It is mounted via a second feed base 14 that can move in the axial direction. The advancing and retreating of the turret carriage 10B and the second feed table 14 are performed by Y-axis servomotors 17 and X-axis servomotors 18 via feed screws 15 and 16, respectively.

The transport device 2 includes a rail 19 extending upward over the left and right processing sections 1A and 1B,
And a loader 20 that travels along the gantry. The work W can be loaded and unloaded to and from the two spindles 3A and 3B. The left main shaft 3A
May be one in which a long bar material is supplied from the rear into a hollow hole passing through the shaft center portion. In this case, the transport device 2 includes the loader 20 and a bar material feeding device (FIG. (Not shown).

FIG. 2 shows the operation in the case where the work W is processed on both sides by the opposed two-axis lathe 1. As shown in FIG. 1A, the workpiece W is carried into the empty left spindle 3A by the transfer device 2 (FIG. 1) as shown in FIG. 1B, and is gripped by the left spindle 3A. One surface of the work W is machined by the tool 21 of the left turret 4A (FIG. 1) (FIG. 1C).
The semi-finished product work W that has been processed on one side is transferred to the right spindle 3B by the advance of the left headstock 6A as shown in FIG. 9D (FIG. 10A). So-called kissing is performed. The semi-finished product work (second material work) W gripped by the right spindle 3B is processed on the other side by the tool 21 of the right turret 4B as shown in FIG. 2 Completed product) Work W The finished product work W of the right spindle 3B is carried out by the transfer device 2,
The right spindle 3B is empty and waits for delivery of the next semi-finished product work W. Such an operation is performed by the spindles 3A and 3B on both sides.
In parallel.

FIG. 3 shows a conceptual configuration of a control device for controlling the processing cell. This processing cell control device includes a machine tool 1
And a work transfer means control device 31 for controlling the work transfer device 2. The machine tool controller 30 includes a numerical controller 33, a programmable machine controller 34, and an operation panel 32.
Consists of The numerical control device 33 includes a left processing unit control unit 35A and a right processing unit control unit 35B that control the left processing unit 1A and the right processing unit 1B of the machine tool 1, respectively. Each of these control means 35A, 35B individually has a central processing unit (CPU) and arithmetic processing units 36A, 36B each composed of a storage element such as a ram (RAM) and a ROM (ROM). The processing units 36A and 36B execute a machining program 37A for the left machining unit and a machining program 37B for the right machining unit, respectively. The programmable machine controller 34 is a unit that mainly performs sequence control of the machine tool 1 in cooperation with the numerical controller 33 by a signal.

The machining program 37A for the left machining section is shown in FIG.
As shown in a schematic configuration in (C), a plurality of process programs 52A to 54A are provided, and at the end of each process program 52A to 54A, the work state discrimination data is overwritten in a predetermined storage unit 38. Rewrite command 55
A to 57A. Also, the machining program 37A
In the part before the description part of the first process program 52A, there is provided a work state determination command 51A as a condition determining means. The work state determination command 51A is stored in the storage unit 38.
Is a command to read the workpiece state distinction data and shift the execution to the corresponding process program 52A to 54A. The storage unit 38 includes a register and the like in the programmable machine controller 34. The storage unit 38 has a storage unit 38A for left processing and a storage unit 38B for right processing. The machining program 37B for the right machining section has a plurality of process programs, a work state determination command, and a rewrite command, similarly to the machining program 37A for the left machining section.

FIGS. 4 and 5 show these left and right processing portions 1A,
1B is a flowchart showing the machining programs 37A and 37B of FIG. 1B, and FIG. 6 shows a schematic program list thereof. First,
The left machining program 37A will be described with reference to FIG.
The left machining program 37A is provided with a process program (Step S3) for loading a work into the spindle 3A, a process program (S5) for actual machining, and a process program (S7) for an operation for transferring a work between the spindles. Have been.
After each process program (S3, S5, S7), a rewrite command (S4, S6, S8) for rewriting the work state distinction data in the storage unit 38A is provided.

Rewrite command after work loading step (S4)
Then, the work state discrimination data is used as discrimination data indicating that the work state is a work state in which the work loading process has been completed.
Rewrite to numerical data of "1". In the rewrite command (S6) after the end of the actual machining, the numerical value data of "2" is rewritten as discrimination data indicating the work state in which the actual machining is completed.
In the rewrite command (S8) after the transfer of the work between the spindles, the data is rewritten to numerical data of "0" as discrimination data indicating that there is no work on the spindle 3A. The storage unit 38A
Is set to “0”.

When the left machining program 37A is started, first, each starting condition of the machine tool 1, for example, the opening / closing state of the door of the machine cover is checked (step S1). If the condition is satisfied, the next work state determination is made. Proceed to step (S2). Here, the data in the storage unit 38A is read, and if the work state is "0", the spindle 3A is in an empty state, and the process directly proceeds to the next step, a work loading process program (S3). If the work state is "1" in the determination step (S2), the process jumps to the actual machining process program (S5) because the workpiece state is the mechanical state where the workpiece W is already gripped by the main shaft 3A. When the workpiece state is “2”, it is a mechanical state in which the first completed workpiece W that has been processed on one side is gripped by the spindle 3A.
The process jumps to the process program (7) for workpiece transfer between spindles.

The right machining program 37B shown in FIG. 5 is a process program (R) for transferring a work between spindles.
3), the actual machining process program (R5), and the spindle 3B
And a process program (R7) for unloading the work from the. Each process program (R3, R5, R
After 7), a rewrite command (R4, R6, R8) for rewriting the work state distinction data in the storage unit 38B is provided. A rewrite command (S
In 4), numerical data of "3" is rewritten as discrimination data indicating that the single-side processed work (second material work) W is in the state of the work held by the spindle 3B.
According to the rewrite command (R6) after the end of the actual machining, the work W that has been subjected to the actual machining and has been subjected to the double-sided machining (second completed product) is rotated by the spindle 3B
Is rewritten to numerical data of "4" as distinction data indicating the state of the work being gripped. In the rewrite command (R8) after the work unloading step, the data is rewritten to numerical data of “0” as distinction data indicating that there is no work on the spindle 3B. The initial value of the storage unit 38B is set to “0”. The values of “3” and “4” may be “1”, “2”, etc., respectively, but they are “3” and “4” in order to clarify the distinction from left processing. .

When the right machining program 37B is activated, each activation condition of the machine tool 1 is checked (R1) as in the left machining section. If the conditions are satisfied, the process proceeds to the next work state determination step (R2). move on. Here, the data in the storage unit 38B is read, and if the work state is "0", the spindle 3B is in an empty state, and therefore, the process directly proceeds to the next step, the step-to-spindle work delivery process program (R3). If the work state is "3" in the determination step (R2), it is a mechanical state in which the second material work W is already gripped by the main shaft 3B, and thus the actual machining process program (R5).
Jump to If the work state is "4",
Since the second completed product work W that has been subjected to the double-side processing is in a mechanical state in which the work W is gripped by the spindle 3B, the process jumps to the work unloading process program (R7).

As described above, when the execution of the machining programs 37A and 37B is started, the state of the machine tool 1 in each of the left and right machining sections 1A and 1B is changed to one of the step programs (S3 and S3).
5, S7, R3, R5, R7) to determine whether the state corresponds to the state of the machine, and to execute the program from the corresponding process program. Therefore, the operator does not need to visually check the state of the machine. Appropriate restarting, that is, continuation of machining, can be performed by a simple operation merely by giving an execution command. In this case, as shown in the program list of FIG. 6, in each of the machining programs 37A and 37B, each of the process programs S5, S7, R5, and R7 to be started by the jump after the condition determination.
Is the sequence number (in the example shown, “N900
0 ”and (N9100”) are preferably fixed values and cannot be changed. Thus, even when the contents of each process program are changed, a program error can be prevented, and the maintenance work of the program can be easily performed. Also,
There is no need to define a work status check command. Further, in this embodiment, the machining programs 37A and 37B are configured such that each process is separated by the state of the machine tool. Specifically, the process of transporting the work, that is, where the work is located, and the machining state of the work (particularly, (In the case of the processing state), it is easy to return to the middle of the operation regardless of the work state of the processing state in any transport process.

Although the above embodiment has been described in connection with the case where the machine tool is a lathe, the present invention can be applied to control of various other machine tools, and in particular, machining of a complicated process having a plurality of machining sections. Practical effects are great for machine tools that perform

[0021]

The machine tool control device according to the present invention includes control means for controlling a machine tool by executing a machining program including a plurality of process programs, and the control means controls the machine tool before starting the execution of the process program. At the start of the execution of the program, since the machine tool has a condition determination means to determine whether the state of the machine tool corresponds to any of the process programs and to execute from the corresponding process program, when machining is interrupted, Proper processing can be continued with simple operations. Further, the machining program has a rewrite command for overwriting the work state discrimination data in a predetermined storage unit at the end of each process program step, and the condition determining means includes a description part of the first process program of the machining program. In accordance with the work state determination command described in the preceding part, the work state discrimination data in the storage unit may be read and the execution may be shifted to a corresponding process program. Appropriate machining can be continued by simple operations. Further, when the control means causes the program execution to jump to a fixed sequence number described in the execution start line of the process program corresponding to the determination result of the condition determining means, the content of the process program is changed. Even if such maintenance is performed, a program error can be prevented, and the maintenance work of the program can be easily performed.

[Brief description of the drawings]

FIG. 1 is a plan view of a facing two-axis lathe to which a machine tool control device according to an embodiment of the present invention is applied.

FIG. 2 is a process explanatory view of the two-axis lathe.

3A is a block diagram showing the conceptual configuration of the machine tool control device, FIG. 3B is an explanatory diagram showing the relationship between the contents stored in its storage unit and the state of the work, and FIG. It is explanatory drawing of a structure.

FIG. 4 is a flowchart of a left machining program.

FIG. 5 is a flowchart of a right machining program.

FIG. 6 is an explanatory diagram of a schematic program list of left and right machining programs.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Machine tool 33 ... Numerical control apparatus 1A ... Left processing part 34 ... Programmable machine 1B ... Right processing part Controller 2 ... Work transfer device 35A ... Control means of a left processing part 3A, 3B ... Spindle 35B ... Control means of a right processing part 4A, 4B ... turret 36A, 36B ...
Arithmetic processing unit 5A, 5B: spindle chuck 37A: machining program for left machining unit 6A, 6B: headstock 37B: machining program for right machining unit 30: machine tool controller 38, 38A, 3
8B: storage unit 31: work transfer means control device W: work

Claims (3)

[Claims] 1. A control means for controlling a machine tool by executing a machining program including a plurality of process programs,
This control means determines whether the state of the machine tool corresponds to any of the process programs at the start of the execution of the machining program before the execution of the process program, and determines a condition to be executed from the corresponding process program. A machine tool control device having means. 2. The machining program has a rewrite command for overwriting the work state discrimination data in a predetermined storage unit at the end of each process program step, and the condition determining means includes a first process program of the machining program. 2. The machine tool control device according to claim 1, wherein the work state discrimination data stored in the storage unit is read in accordance with a work state determination command described in a part preceding the description part, and execution is shifted to a corresponding process program. 3. The program execution device according to claim 1, wherein the control means causes the program execution to jump to a fixed sequence number described in an execution start line of the process program corresponding to a result of the determination by the condition determination means. Machine tool control equipment.