JPH03270848A - Processing control method for machine tool - Google Patents

Abstract

PURPOSE:To save labor in preparing a processing program and utilize the memory region effectively by selecting a tool according to the ID code when the same kind of works on spindles are to be processed, and indexing it in the processing position on each turret. CONSTITUTION:When processing is to be made to the same kind of works 26 held on spindles 23, 25 according to the processing program PRG, the ID code TC corresponding to tools used 37 is read, and by reference to the corresponding file TDF, judgement is made about the tool fitting part of turrets 35, 36 of the tools 37 corresponding to the read ID code TC. The same kind of tools 37 are located in the processing position POS by indexing the tool fitting parts of the turrets 35, 36 obtained by the judgement, and then the same kind of works 26 held on the two spindles 23, 25 are processed by these tools 37 in accordance with the processing program PRG.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention has two headstocks having workpiece spindles facing each other, and a tool rest having a freely indexable turret corresponds to each headstock. The present invention relates to a machining control method in a machine tool that is suitable for application to machine tools, etc. provided in a manner that

(b), Conventional technology Conventionally, in this type of machine tool, when machining workpieces of the same type (shape and material) separately on both headstocks based on a machining program, the The tools used for machining are designated in the machining program by numbers corresponding to the tool mounting portions of the turrets of each tool post.

(C) 6 Problems to be Solved by the Invention However, in this case, if the tool used for machining with one double headstock is installed in different tool mounting parts on both turrets, the tool during the machining program Since the designation numbers, etc. are different, it was necessary to create a machining program for each headstock. That is, in this case, even though the same type of machining is performed using a single headstock, it is necessary to create two machining programs separately and store them in a predetermined memory area, which reduces the time and effort required to create machining programs. Not only does it take a lot of time, but it also requires a large memory area for the machining program.

In view of the above circumstances, the present invention provides a machining control method for a machine tool that allows machining of the same type of workpiece with five headstocks based on one machining program that can be shared by both headstocks. With the goal.

(d) Means for solving the nine problems, that is, the present invention has two headstocks (21, 22) provided facing each other, and these headstocks (21, 22).
22) has a workpiece spindle (2) that can hold the workpiece (26).
3, 25) are provided rotatably, and the tool rests (32, 25) are provided rotatably.
A tool (33) is provided corresponding to each of the headstocks (21, 22), and a tool (3) is provided on each of the tool rests (32, 33).
7), a plurality of tool mounting parts (35b, 36b
) in a machine tool (1) which is equipped with indexable turrets (35, 36), each having a workpiece (26).
The tool (37) that may be used for machining of
At the same time, an identification code (TC) indicating the type of the tool (37) and the tool (37) are attached to the tool (37).
A correspondence file (TDF) indicating the correspondence with the tool mounting part (35b, 36b) of each of the turrets (35, 36) to which the turrets (35, 36) are attached is stored, and
Among the tools (37) mounted on the tool mounting portions (35b, 36b) of 6), the tool (37) actually used for machining the workpiece (26) is identified by the identification code (TC) in the machining program (PRG). ), and each headstock (2
When performing machining based on the machining program (PRG) on the same type of workpieces (26) held by the workpiece spindles (23, 25) of Nos. 1 and 22), respectively.

Read the identification code (TC) corresponding to the tool (37) used for machining shown in the machining program (PRG), and refer to the corresponding file (TDF) based on the read identification code (TC). The tool mounting portions (35b, 36b) in each turret (35, 36) of the tool (37) corresponding to the read identification code 1" (TC)
), and each of the determined turrets (35, 36)
Place the tool mounting parts (35b, 36b) at the predetermined machining position (P
05), the same type of tool (37) is positioned at the machining position (pos), and then the positioned tools (37) are used to perform both workpieces based on the machining program (PRG). Main shaft (2
3, 25) is configured to process the same type of workpiece (26) held by the machine.

Note that the numbers in parentheses are for convenience to indicate corresponding elements in the drawings, and therefore, this description is not limited to the description on the drawings. r(e) below,
The same applies to the column "Effect".

(e) 9 Effects With the above-described configuration, the present invention has the following features:
), when machining the same type of workpiece (26) held on the workpiece spindles (23, 25), the same type of tool (37) actually used for machining the workpiece (26) is (37) is selected by the identification code (TC) corresponding to the type, and acts to be respectively assigned to the processing position (pos) on each turret (35, 36).

(f), Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a control block diagram showing an example of a multi-tasking machine tool to which an embodiment of the machining control method for a machine tool according to the present invention is applied.

FIG. 2 is a perspective view of the turret part of the multitasking machine tool shown in FIG. 1, and FIG. 3 is a schematic diagram showing an example of a tool data file.

FIG. 4 is a schematic diagram showing an example of a machining program.

As shown in FIG. 1, a multi-tasking machine tool 1, which is a machine tool, has a main control section 2, and an input section 5 such as a keyboard, etc., and a machining program are connected to the main control section 2 via a bus line 3. Memory 6, processing control section 7, head data memory 9, first spindle control section 15, second spindle control section 16, first turret control section 17, second turret control section 19, first turret control section 10
and the second turret control section 11 etc. are connected.

Also, for multi-tasking machine machinists, two headstocks 21.2
2 is provided so as to be freely movable and driven in the Z-axis direction, that is, in the directions of arrows A and B in FIG. (Here, the arrow M and N directions represent the rotation direction for control purposes, and the arrow N direction is the forward rotation direction for control purposes, and the arrow N direction is the reverse rotation direction for control purposes.)

The workpiece spindle 23.25 has chucks 23a and 2 that can grip a workpiece 26 such as a chuck workpiece or a shaft workpiece.
5a are provided respectively, and further headstocks 21 and 22 are provided.
is connected to the ball screw 27.2 via the nuts 21a and 22a.
9 are screwed together. A headstock drive motor 30.31 is connected to the ball screw 27.29, respectively.
The headstock drive motors 30 and 31 are connected to transducers 30a and 3, respectively, so that they can be rotated freely.
1a is provided. The first spindle control section 15 is connected to the headstock drive motor 30 and the transducer 30a, and the second spindle control section 16 is connected to the headstock drive motor 31 and the transducer 31a.

Further, above the headstock 21.22 in FIG. 1, there is a tool rest 32.
33 corresponds to each headstock 21.22 and arrows A and B.
The tool rests 32 and 33 are provided with turrets 35 and 36 that are movable and driven in the directions of arrows C and D perpendicular to the direction, that is, in the direction of the X axis. It is provided so that it can be rotated and indexed in the directions of arrows E and F by an indexing drive motor 12 and a mechanism 3 in a rear-facing configuration. The first turret control section 10 is connected to the indexing drive motor 12, and the second turret control section 11 is connected to the first indexing drive motor 13. As shown in FIG. 2, each turret 35° 36 has a hexagonal prism-shaped body 35a, 36a, and six tool mounting portions 35b, 36b are provided on the outer periphery of each body 35a, 36a, respectively. They are provided with tool mounting position numbers TN○ of "1" to "6". Each tool mounting part 35b, 36b is removably provided with various tools 37, such as a turning tool such as a cutting tool and a rotary tool such as a drill or a milling cutter, which may be used for machining the workpiece 26. Main bodies 35a and 36a of turrets 35 and 36
By rotating the index drive motor 12.13 in the directions of arrows E and F, each tool mounting portion 35b, 36b
The upper tool 37 can be indexed to a predetermined machining position PO8 facing the corresponding workpiece spindle 23.25. In addition, each tool rest 32, 33 shown in FIG. 1 has a nut 32a,
Ball screws 41 and 42 attached to the tool post drive motors 39 and 40 are respectively screwed together through the turret drive motors 33a, and by driving the tool post drive motors 39 and 40 in forward and reverse directions, the tool rests 32 and 33 in the X-axis direction (arrow C, D direction)
It can be driven to move. Turret drive motor 39,
40 are provided with transducers 39a and 40a, respectively, and the first tool post control section (7) is connected to the tool post drive motor 39 and the transducer 39a. The second tool rest control section 19 is connected to the transducer 40a.

In addition, as shown in FIG. 1, the headstock 21 and the tool rest 32
The coordinate system in which is driven to move is assumed to be the 28-X1 coordinate, and the direction of arrow B pointing right in the figure is the positive direction of the Z□ axis, and the direction of arrow C pointing upward in the figure is the positive direction of the X1 axis. In addition, the coordinate system in which the headstock 22 and the tool rest 33 are moved and driven is Z2-X.
Assuming 2 coordinates, the leftward direction of the arrow in the figure is the positive direction of the Z2 axis, and the upward direction of the arrow C in the figure is the positive direction of the X2 axis.

By the way, in the hesodotator memory 9 shown in FIG. 1, for example, as shown in FIG. 3, tool data files TDF (TDFl and TDF,
The tool data file TDF1 is related to the tool rest 32 (indicated as "Head E" in the figure), and the tool data file TDF2 is related to the tool rest 33 (indicated as "Head E" in the figure).
(displayed as "Head 2"). Tool rest 32
In the tool data file TDF□, tool data DAT regarding a plurality of tools 37 mounted on the turret 35 of the tool rest 32 shown in FIG. are stored in an organized format based on That is, in the tool data file TDF work, the rTNo, J digit stores the tool installation position number TNO of the turret 35 of the tool rest 32, and the "X tool set" digit stores the tool mounting position number TNO of the turret 35 of the tool rest 32. The tool rest 32 shown in is located at a predetermined first mechanical origin MXP in the X-axis direction.
When the tool 37 mounted on the turret 35 is indexed to a predetermined machining position PO8, the reference work origin SWP machining (the reference work origin SWP is the headstock 21 in the Z-axis direction, but the machine origins MXP and MZP do not move). In the "Z tool set" column, the headstock 21 is
The tool 3 is positioned at a predetermined first machine origin MZP machining in the axial direction and is mounted on the turret 35 of the tool rest 32.
Distance I in the z1-axis direction from the cutting edge of the tool 37 to the reference workpiece origin 5WP1 when 7 is indexed to the machining position PO8
II (herein referred to as the twelfth toolset value ZTL1). Furthermore, the "tool coat" in the tool data file TDF construction shown in Figure 3
The tool code TC is stored in the digit. Here, the tool code TC is an identification code that corresponds to the type of tool 37, that is, its shape and material (for example, carbide open-side bit, high-speed steel boring rebit, etc.), in addition to the tool number unique to each tool. means ro OOIJ~ for each type of tool 37
A four-digit numerical value of r9999J is assigned as the tool coat TC. For example, the tool 37 whose tool installation position number TNO stored in the rTNo, J digit of the tool data file TDF1 shown in FIG. 3 is "2" has the first X tool set value XTLI in the "X tool set" digit r-200J as the first Z tool set value ZTLI in the "Z tool set" digit, and "1234" as the tool code TC in the "tool coat" digit.
" are stored respectively, so the tool mounting position number TN○ of the turret 35 of the tool post 32 shown in FIG. 2 is "
The tool 37 attached to the second tool attachment part 35b which is "2"
is the headstock 21 whose cutting edge is positioned at the first machine origin MZP□ when the predetermined machining position PO8 is indexed.
200 m from the reference work origin swp1 in the direction of arrow C, which is the positive direction of the Xi axis.

This indicates that the tool 37 is offset by 300.4 mm in the direction of arrow B, which is the positive direction of the Z-axis, and that the tool code TC of the tool 37 is r1234J.

This also applies to the tool data file TDF regarding the tool rest 33 shown in FIG. That is, the tool data file TDF contains tool data DAT regarding a plurality of tools 37 mounted on the turret 36 of the tool rest 33 shown in FIG. The information is stored in an organized manner based on the number TNO. That is, the tool data file TD
rTNo in F2, the J digit is the turret 3 of the tool rest 33.
The tool mounting position number TN○ of 6 is stored, and in the digit of "X tool set", the tool rest 33 shown in FIG. 1 is positioned at a predetermined second machine origin MXP2 in the X axis direction, The distance in the X2-axis direction from the cutting edge of the tool 37 mounted on the turret 36 to the reference workpiece origin swp when the tool 37 is indexed to a predetermined machining position gpos (herein, this is referred to as the second A set value XTL2) is stored, and the "Z tool set" digit indicates that the headstock 22 is at a predetermined second machine origin MZP in the two-axis direction.
, and the turret 36 of the tool rest 33
The distance in the 22nd axis direction from the cutting edge of the tool 37 when the tool 37 attached to the tool 37 is indexed to the machining position PO8 to the reference workpiece origin swp2 is 1 m1 (in this specification, this is referred to as the 22nd tool set value ZTL2). ) is stored.

Furthermore, in the tool data file TDF2 shown in FIG.
The tool code TC is stored in the "tool code" digit. For example, rTNo of tool data file TDF2, J
The tool 37 whose tool mounting position number TNO stored in the digit is "1" has r-203J as the second X tool set value XTL2 in the "X tool set" digit and the second X tool set value XTL2 in the "Z tool set" digit. 22 toolset value ZTL2 as “-
301, IJ, and r1234J are stored as the tool code TC in the digit of "r tool code", so the tool mounting position number TN○ of the turret 36 of the tool post 33 shown in FIG. 1 tool mounting part 36b
The tool 37 attached to is.

When indexed to predetermined machining position PO8, arrow C is the positive direction of the X2 axis from the reference workpiece origin swp2 of the headstock 22 whose cutting edge is positioned at the second machine origin MZP2.
It represents an offset of 203 un in the Z direction and 301.1++a in the direction of arrow A, which is the positive direction of the Z x axis, and the tool code TC of the tool 37 is r123.
It shows that it is 4J. Therefore, the tool 37 mounted on the second tool mounting portion 35b whose tool mounting position number TN○ of the turret 35 of the tool rest 32 is "2" and the tool mounting position number TN○ of the turret 36 of the tool rest 33 is "1". ” No. 1
As shown in FIG. 3, the tools 37 mounted on the tool mounting portion 36b have the same tool code TCr1234J, so they are of the same type (shape and material).

Since the multi-tasking machine tool l has the above configuration,
A wide variety of machining operations can be performed on the workpiece 26 using the multitasking machine tool 1. For example, a workpiece 26 such as a chuck workpiece or a shaft workpiece is chucked 26 onto a workpiece spindle 23 on the headstock 21 side located on the left side in FIG.
a, and in that state, attach it to the turret 3 of the tool rest 32.
5, the tool 37 is indexed to a predetermined processing position pos.
After machining the first step, the workpiece 26 that has completed the first step is transferred to the workpiece spindle 25 side, and the tool 37 is indexed to a predetermined machining position PO8 on the turret 36 of the tool post 33. By performing the second process, it is also possible to continuously process the workpiece 26 in the first and second processes. This type of processing is disclosed in, for example, Japanese Unexamined Patent Publication No. 1-246045, so a detailed explanation thereof will be omitted here.

By the way, depending on the shape of the workpiece 26, the second process may not be necessary (that is, the process of the workpiece 26 is completed only in the first process), but in this case, the process shown in FIG. Both headstocks 21 of the multitasking machine tool 1
．． By performing the same type of machining separately in 22, the operating rate of the multi-tasking machine tool can be increased. To do this, one operator inputs the machining data necessary for machining via the input unit 5 while referring to the machining shape of the workpiece 26, and inputs machining data that can be applied to machining with either headstock 21 or 22. One machining program PRG is created as a shared machining program PRG, and the created shared machining program PRG is stored in the machining program memory 6.

For example, as shown in FIG. 4, this shared machining program PRG has a workpiece number WN corresponding to the machining content, and also has a plurality of machining processes PR (PRl, PR, . . .
PR3, etc.), and each machining process PR is assigned a three-digit sequence number SQN representing the order of execution.

In each machining process PR, an operation command COM corresponding to the operation content in the machining process PR is stored in the right side of the diagram of the sequence number SQN as an EIA code, and a predetermined machining process PR stores the operation command COM corresponding to the operation content in the machining process PR. Tool code TC1 of the tool 37 actually used for machining in PR and the subsequent machining process PR, that is, tool 3
Identification codes corresponding to 7 types (shapes and materials) are stored. That is, the tool 37 actually used for the processing
is the tool 3 instead of the tool mounting position number TNO of the turret 35, 36 in the shared machining program PRG.
It is specified by tool code TC corresponding to 7 types.

Note that the shared machining program PRG is not necessarily EIA
There is no need to create a PR using a code, as long as the tool code TC of the tool 37 used for the machining is included, any machining program PR such as a simple interactive program can be created.
It doesn't matter if it's G.

For example, the shared machining program PRG shown in FIG.
rWNo, rlOOJ is stored as the work number WN in the J digit, so the work number W is 100J.
It has processing contents corresponding to N. In the machining program PRG, the machining process PR machine at the top of the diagram has a sequence number SQN of "001", and the machining process PR machine has a tool code TC of "123".
4" is stored, the corresponding machining process PR
The operation 1 is executed first, and the content of the operation is to rapidly position the cutting edge of the tool 37 whose tool code TC is r1234J to a predetermined machining start point based on the operation command COM. . Further, the processing process PR1 below the processing process PR, that is, the processing process PR with the sequence number SQN r002J, the processing process PR1 with the sequence number SQN roO3J, etc., is the same as the processing process PR.

That is, until the next tool code TC is designated, the tool 37 with the tool code TC r1234J is instructed to perform a predetermined rapid positioning operation, turning operation, etc.

In this way, when the shared machining program PRG having the predetermined workpiece number WN is stored in the machining program memory 6, the operator cuts two workpieces 26 of the same type (shape and material) into the machining slot as shown in FIG. Workpiece spindles 23.25 of both headstocks 21.22 of the multitasking machine tool 1 shown in
Here, the workpiece 26 mounted on the workpiece spindle 23 on the headstock 21 side is attached to the workpiece 26A and the workpiece spindle 25 on the headstock 22 side via the chucks 23a and 25a, respectively.
The workpiece 26 mounted on the is referred to as a workpiece 26□. ),
In this state, these works 26A,
26. A workpiece number WN corresponding to the contents of the machining to be performed from now on, ie, a workpiece number WNrlOOJ, is inputted to the input section 5, and a machining start command is outputted to the main control section 2 via the input section 5. Then, the main controller 2 informs the processing controller 7 of the input workpiece number WN (i.e. r
command to perform machining based on the shared machining program PRG having the filename (loOJ) on the ambidextrous spindles 21 and 22.

In response to this, the machining control unit 7 executes "rloo" shown in FIG.
The machining program PRG having the workpiece number WN is read from the machining program memory 6, and the sequence number SQN in the read machining program PRG is r O
Tool coat TC5 of machining process PR□ which is O1'J
In other words, the tool code TC of the tool 37.37 (i.e. r1234
Load J). Furthermore, the processing control section 7 shown in the engineering drawing
The read tool code TC, r1234J, is output to the first turret control unit 10 and the second turret control unit 11, and the tool 37 whose tool coat TC is r1234J is output.
．． Tools to be used for processing 37 from now on 37.37
command to index the machining position PO8 on each turret 35,36.

Then, the first turret control section 10 shown in FIG.
Tool data file TDF regarding the tool post 32 shown in the figure
1 is read from the head data memory 9, the tool code TC stored in the "tool code" digit in the read tool data file TDF1 is searched, and the tool code T
The rTNo of the tool 37 whose C is "1234" and the tool mounting position number TN○ (ie, "2") of the turret 35 of the tool post 32 stored in the J digit are read. Next, the first turret control unit 10 drives the indexing drive motor 12 shown in FIG. 1 to move the turret 35 of the tool rest 32 in the direction of the arrow based on the read tool mounting position number TN○ "2". Rotate in the E or F direction, as shown in Figure 2,
The second tool mounting position number TN○ of the turret 35 is “2”
Tool 37 (tool code T) mounted on tool mounting portion 35b
C determines r1234J) to a predetermined processing position PO5. On the other hand, the second turret control unit 11 stores the tool data file TDF2 regarding the tool rest 33 in the head data memory 9.
The read tool data file TD
Tool code T stored in the "tool code" digit in F2
C is searched, rTNo of the tool 37 whose tool code TC is r1234J, and the tool installation position number TN○ of the turret 36 of the tool post 33 stored in the J digit (i.e., "1")
Load. Next, the second turret control unit 11 drives the indexing drive motor 13 to move the turret 36 of the tool post 33 in the direction of arrow E or F based on the read tool mounting position number TN○, which is "1". The tool 37 (the tool code TC is "
1234'') to a predetermined processing position PO8.

As a result, the machining process PR whose sequence number SQN in the machining program PRG shown in FIG. 4 is rooIJ
A tool 37.37 that is actually used in the machining instructed in the following machining processes PR2, PR, etc., that is, a tool 37.37 whose tool coat TC is r1234J.
A tool 37.37 (therefore of the same type) is indexed to a predetermined machining position PO8 in both turrets 35.36. That is, although the tools 37.37 that will actually be used for the machining that will be performed on the ambidextrous spindle stock 21.22 are of the same type as mentioned above, the turret 35 on the tool post 32 side is Tool mounting position number TN○
is mounted on the second tool mounting portion 35b whose number is “2”, whereas on the tool rest 33 side, the tool mounting position number TN○ of the turret 36 is mounted on the first tool mounting portion 36b where the tool mounting position number TN○ is rlJ. Therefore, the tools 37 and 37 that will be used for the machining that will be performed from now on the ambidextrous spindle 21 and 22, as before,
When specifying the tool mounting position number TN○ of the turret 35, 36 of each tool post 32, 33.

Two different tool mounting position numbers TN○, that is, “2
” and rlJ are required (therefore, the machining program PR
It is also necessary to create two separate Gs.

). However, these tools 37 and 37 correspond to the tool coat TC1, that is, the type of tool 37, which is "1234" instead of the tool mounting position number TN○ of the turrets 35 and 36 in the machining program PRG shown in FIG. The tool code TC is r123.
4J is the same type of tool 37.37 is on both turrets 35
．． Even if the tool is mounted on the tool mounting parts 35b and 36b having different tool mounting position numbers TN○ in 36, it can be specified with one tool code TC (i.e. r12:34J), so the machining program PRG can also be It is sufficient to create only one program, and it is possible to perform appropriate indexing operations in the double-edged anastomoses 32 and 33 based on the shared machining program PRG.

In this way, the tool 37.37 (i.e. tool code TC
are both rl 234J tools 37.37 of the same type
) has been determined to a predetermined machining position PO8 on both turrets 35, 36, using a known method, the two turrets 35, 36 are used with tools 37, 37 that are determined to have a machining value of 1pos. The same type of machining is performed separately on the spindles 21 and 22. That is, the machining control section 7 controls the first spindle control section 15 and the first tool post control section 17, as well as the second spindle control section 16 and the second tool post control section 19, regarding the tool post 32 shown in FIG. Tool data file TDF1
The 12th tool set value ZTLI of tool 37 whose tool code TC is "1234J" (i.e. r-200J)
and the twelfth toolset value ZTLI (i.e. r-30
0,4J) and the second X tool set value XTL2 of the tool 37 whose tool code TC in the tool data file TDF regarding the tool post 33 is r1234J (i.e.

r-203J) and 2nd Z2) Lt set value ZTL2
(i.e. r-3ox, IJ), each machining process PR in the machining program PRG, PR,
, PR, etc., are outputted as appropriate in order of decreasing sequence number SQN to each of the turrets 35.3 in both headstocks 21.22.
Predetermined machining is performed using the tools 37 and 37 determined at the machining position P○S on 6.

That is, regarding machining of the workpiece 26A mounted on the workpiece spindle 23, the first spindle control section 15 drives the headstock drive motor 30 to control the workpiece 26A via the ball screw 27.
1 in the 2□ axis direction, that is, in the directions of arrows A and B in FIG.
□Move in the axial direction, that is, in the direction of arrow C1D, and attach it to the workpiece spindle 23 by the tool 37 that is indexed to the machining value 1PO5 on the turret 35 of the tool post 32 based on the tool code TC in the machining program PRG. completed work 2
A predetermined process is performed on 6A based on the process program PRG. On this occasion.

The amount of movement of the headstock 21 in the directions of arrows A and B is constantly detected via the transducer 30a of the headstock drive motor 30 and fed back to the first spindle control section 15.
The movement of the headstock 21 is performed according to the machining program PRG. Further, the amount of movement of the tool post 32 in the directions of arrows C and D is determined by the transducer 39a of the tool post drive motor 39.
The movement of the tool rest 32 is performed according to the machining program PRG because it is constantly detected via the tool post and fed back to the first tool post control section 17.

On the other hand, the workpiece 26□ mounted on the workpiece spindle 25 is similarly machined based on the same machining program PRG. That is, the second spindle control section 16 drives the headstock drive motor 31 to move the headstock 22 through the ball screw 29 in the 22-axis direction, that is, in the directions of arrows A and B in FIG. The control unit 19 drives the tool post active motor 40 to control the tool post 33 via the ball screw 42.
is moved in the X2-axis direction, that is, in the arrow C and D directions, and the workpiece spindle is moved by the tool 37 indexed to the machining position PO8 on the turret 36 of the tool post 33 based on the tool code TC in the machining program PRG. A predetermined process is performed on the workpiece 2G mounted on the workpiece 25 based on the process program PRG. At this time, the headstock drive motor 31 and the tool post drive motor 40 each have a transducer 31
a and 40a, the movement of the headstock 22 in the directions of arrows A and B and the movement of the tool post 33 in the directions of arrows C and D are performed according to the machining program PRG. Note that when the tools 37° 37 indexed to the machining position PO8 on each turret 35, 36 are both set upward as shown in FIG. , move the work spindle 23 on the headstock 21 side in the direction of arrow N.
The workpiece spindle 25 on the headstock 22 side can be rotated in the direction of the arrow M, so that the workpiece spindle 23 can be rotated in the direction of the arrow M.
The workpiece 26A mounted on the workpiece 26A and the workpiece 26A mounted on the workpiece spindle 25. Machining for B is performed appropriately in a manner corresponding to the orientation of each tool 37.

In this way, when the execution of the machining program PRG shown in FIG.
The outer periphery of the workpiece 26A mounted on the workpiece 26A and the workpiece spindle 2
A predetermined turning operation based on the machining program PRG is completed on the outer circumference of the workpiece 26B mounted on the
As a result, as shown by the broken line in FIG.
Works 26A, 26! of the same shape in 2! The processing of l is completed. After the processing is completed, these processed workpieces 26
Remove A and 26B from the headstock 21.22.

Next, the workpieces 26.26 to be machined are mounted on the headstock 21°22, and the workpieces 26.26
Turning processing is performed on each of them based on a common processing program PRG.

In addition, in the above-mentioned embodiment, as shown in FIG.
Both headstocks 21 and 22 are in two-axis directions (arrows A and B directions)
, and both turrets 32 and 33 move in the X-axis direction (arrow C
, D directions), the present invention is a machine tool having a plurality of headstocks 21, 22 and the same number of tool rests 32, 33 as the headstocks 21, 22. It can be applied to any type of machine tool as long as it is. For example, there is an opposed spindle lathe in which two headstocks are fixed and both tool rests move in the X and Z axis directions, and one in which one of the two headstocks is fixed and Of course, it is also possible to apply the present invention to opposed spindle lathes in which the corresponding tool rests move in the X and Z axis directions.

(g) As described in detail of the first invention, according to the present invention, there are two headstocks 21 and 22 provided facing each other, and these headstocks 2 and 22 have the following features: Workpiece spindles 23, 25 capable of holding a workpiece 26 are rotatably provided, respectively, and a tool rest 32.25 is provided.
A turret 35.36 having a plurality of tool mounting portions 35b, 36b on which a tool 37 can be mounted can be freely indexed to the tool rest 32.33. In a machine tool such as a multi-tasking machine tool 1 installed in each of the turrets 35.
6, and an identification code indicating the type of the tool 37, such as a tool code TC, and a tool mounting portion of each of the turrets 35 and 36 to which the tool 37 is mounted. A corresponding file such as a tool data file TDF indicating the correspondence with the tool mounting portions 35b and 36b of each turret is stored.
Among the tools 37 installed in the headstock 21, 22, the tool 37 actually used for machining the workpiece 26 is designated by the identification code in the machining program PRG.
When performing machining based on the machining program PRG on the same type of workpieces 26 held on the workpiece spindles 23 and 25 of reading the coat, and determining the tool mounting portions 35b, 36b in each turret 35, 36 of the tool 37 corresponding to the read identification code by referring to the corresponding file based on the read identification code; By determining the tool mounting portions 35b and 36b of each of the determined turrets 35 and 36 to a predetermined machining position PO5, the same type of tool 37 is placed in the machining position PO3, and then,
Since these positioned tools 37 are configured to machine the same type of work 26 held by both work spindles 23.25 based on the machining program PRG, each work head 21.25 The same type of tool 37 actually used for machining the same type of workpiece 26 is the turret 35.3 on which the tool 37 is attached.
6, the tool 37
The same tool code TC corresponding to the type is selected, and after being indexed to the machining position PO8 on each turret 35 and 36, it is used for machining on the double headstocks 21 and 22, so one double headstock is selected. 21. Machining of the same type of workpiece 26 in 22 is performed using one shared machining program P.
This can be done based on RG.

Therefore, even if the headstocks 21 and 22 used are different, if the machining contents are the same, only one machining program PRG needs to be created. Since there is no need to be aware of which tool mounting section 35b, 36b of the turret 35, 36 the tool 37 is attached to, the time and effort required to create a machining program PRG can be greatly reduced, and the memory area of the machining program PRG can be saved. It becomes possible to use it efficiently.

[Brief explanation of drawings]

FIG. 1 is a control block diagram showing an example of a multi-tasking machine tool to which an embodiment of the machining control method for a machine tool according to the present invention is applied. FIG. 2 is a perspective view of the turret part of the multitasking machine tool shown in FIG. 1, and FIG. 3 is a schematic diagram showing an example of a tool data file. FIG. 4 is a schematic diagram showing an example of a machining program. 1...Machine tool (complex processing machine tool) 2nd, 2
2... Headstock 23.25... Workpiece spindle 26... Workpiece 32.33... Turret 35.36... Turret 35b , 36b... Tool mounting part 37...
・Tool pos... Machining position PRG... Machining program TC... Identification code (tool code) TDF...
...Corresponding file (tool data file)

Claims (1)

[Scope of Claims] Two headstocks are provided facing each other, each of these headstocks is rotatably provided with a workpiece spindle that can hold a workpiece, and a tool rest is attached to each of the spindles. In machine tools, each of which has a turret that can be freely indexed and has a plurality of tool mounting parts on which tools can be mounted, may be used for machining workpieces. Attach the tools to the tool mounting portions of each of the turrets, and store, for these tools, a correspondence file indicating the correspondence between an identification code indicating the type of the tool and the tool mounting portion of each of the turrets to which the tool is mounted. Among the tools mounted on the tool mounting portion of each of the turrets, the tool actually used for machining the workpiece is specified in the machining program by the identification code, and is attached to the workpiece spindle of each headstock. When performing machining based on the machining program on the same type of work held, read the identification code corresponding to the tool used for machining indicated in the machining program, and apply the read identification code to the tool. determining the tool mounting portion of each turret of the tool corresponding to the read identification code by referring to the corresponding file based on the identification code, and determining the tool mounting portion of each of the determined turrets to a predetermined machining position. The same type of tools are positioned at the machining position, and then the same type of workpieces held by the two workpiece spindles are machined using these positioned tools based on the machining program. Machining control method for configured machine tools.