CN102540970B - The control method of lathe and lathe - Google Patents

Abstract

The present invention relates to the control method of lathe and lathe.Even if this lathe sends cutter changing instruction and also automatically can perform in the suitable moment with the auxiliary movement instruction performed side by side simultaneously.CPU reads the content of each instruction and execution moment with reference to form, sort, be stored into RAM according to the order performing the moment to command content.When instruction is cutter changing instruction (S3: yes), CPU performs Z axis rising process, and main tapping rises to cutter changing position (ATC initial point) from current location.When main tapping 7 rises to R point (S5: yes), when having in the content of instruction being stored in RAM (73) when performing the instruction that moment A performs (S6: yes), perform the content (S7) of the instruction performed at this execution moment A.

Description

Machine tools and machine tool control methods

technical field

The invention relates to a machine tool and a control method for the machine tool.

Background technique

The machine tool has a plurality of detachable tools, and various machining can be performed continuously by sequentially mounting the tools specified by the machining program entered in the interactive mode on the spindle. In the machine tool of Japanese Patent Application Publication No. 314236 in 2004, when the tool installed on the main shaft is replaced, the spindle head is moved from the machining area to the tool replacement area (ATC origin) in order to prevent the workpiece from interfering with the tool. The machine tool performs tool change work and auxiliary operations in parallel, reducing work time.

The above-mentioned machine tool performs the first auxiliary action (such as B CD signal output) after changing the tool, then performs the second auxiliary action (such as the spindle forward rotation), and then performs the third auxiliary action (such as the tool magazine rotation). Therefore, there is a problem that the tool replacement cycle cannot be shortened.

Contents of the invention

The object of the present invention is to provide a machine tool and a machine tool which can automatically execute the tool replacement command and the auxiliary motion command at an appropriate time even if the tool replacement command and the auxiliary motion command executed in parallel with the tool replacement command are issued at the same time, thereby shortening the tool replacement cycle. Control Method.

The machine tool according to claim 1 includes: a spindle drive unit for driving the rotation of a spindle having a tool; a spindle head moving unit for moving a spindle head which supports the spindle rotatably; and a tool changing device. a control unit, which controls the above-mentioned spindle drive unit, the above-mentioned spindle head moving unit and the above-mentioned tool changing device according to the processing program, wherein one block program among the plurality of block programs constituting the above-mentioned processing program has a storage unit, and the storage unit records at least The tool replacement command and the auxiliary action command store multiple sets of the auxiliary action command, the action content of the command, and the execution time of the action corresponding to each other. Auxiliary action.

Therefore, in this machine tool, since the control unit executes the auxiliary operation corresponding to the command with reference to the execution time of the storage unit, even if a tool change command and a command to be executed in parallel are commanded at the same time, it is possible to perform the operation at an appropriate time regardless of the order of execution. These instructions are executed automatically at the moment.

In this machine tool, one of the execution timings described above may be set as the first execution timing at which the tool does not interfere with the workpiece and the jig. In this structure, the tool does not interfere with the workpiece and the fixture.

Another execution time among the execution times may be set as a second execution time at which tool replacement by the tool replacement device is completed. In this configuration, the operations to be executed can be executed in parallel from the second execution time when the tool replacement is completed.

The execution time may be a predetermined execution time after the second execution time. In this configuration, the operations to be executed can be executed in parallel from a predetermined execution time after the second execution time at which tool replacement is completed.

Technical solution 5 is a control method of a machine tool, the machine tool comprising: a spindle driving part for driving a spindle having a tool to rotate; a spindle head moving part for moving a spindle head which enables the above-mentioned spindle to rotate ground supporting the spindle; a tool changer; a control unit that controls the spindle drive unit, the spindle head moving unit, and the tool changer according to a machining program, one of the block programs constituting the machining program has a table, The table at least records the tool replacement command and the auxiliary action command, and stores multiple sets of the auxiliary action command, the action content of the command, and the execution time of the action. The control method is to use the above-mentioned control unit of the machine tool The control method carried out, wherein the computer as the control unit executes the above-mentioned auxiliary action corresponding to the above-mentioned instruction according to the above-mentioned execution time.

In the above-mentioned control method, the computer as the control section executes the above-mentioned auxiliary action corresponding to the above-mentioned instruction according to the execution time stored in the above-mentioned storage section, so even if a tool replacement instruction and an instruction to be executed in parallel are simultaneously instructed, execution Sequentially and automatically at the appropriate moment.

Description of drawings

Figure 1 is a front view of the machine tool.

Fig. 2 is a perspective view of the machine tool with the guard removed.

Fig. 3 is a front view of the tool changing mechanism and the spindle head of the machine tool.

FIG. 4 is a block diagram showing the electrical configuration of the machine tool.

FIG. 5 is a schematic diagram of a storage area of a storage unit.

6 is a schematic diagram of a table of parallel execution processing of an auxiliary operation in a tool replacement operation.

FIG. 7 is a sequence diagram of parallel execution processing of an auxiliary operation in a tool replacement operation.

FIG. 8 is a flowchart of parallel execution processing of an auxiliary operation in a tool replacement operation.

Detailed ways

The overall configuration of a machine tool 1 as an embodiment of the present invention will be described with reference to FIG. 1 . The machine tool 1 relatively moves a workpiece (not shown) and a tool 6 (see FIG. 3 ), and performs desired machining (milling, drilling, cutting, etc.) on the workpiece. The machine tool 1 has a machine tool main body 11 (see FIG. 2 ), a base 2 , and a cover 3 .

The base 2 is an iron base of the machine tool body 11 . The base 2 has leg portions 2a at four corners of the lower portion. The four leg parts 2a are fixed on the floor of a factory or the like to set the machine tool 1 at a predetermined position.

The shield 3 is located on the upper part of the base 2 . The cover 3 is formed in a substantially rectangular parallelepiped shape surrounding the machine tool body 11 , and has a machining area inside the cover 3 . The machine tool body 11 performs workpiece machining in the machining area. The hood 3 has horizontally movable opening and closing doors 4 and 5 on the front surface for opening and closing the opening. The opening and closing doors 4, 5 have glass window portions 4a, 5a substantially in the center. The opening and closing door 4 has a handle part 4b near the right end part, and the opening and closing door 5 has a handle part 5b near the left end part. The handle parts 4b, 5b are opened in directions away from each other to open the opening. A worker loads and unloads workpieces with respect to the table 10 in the hood 3 through the opening.

The cover 3 protects the machine tool body 11 from the outside by surrounding the machine tool body 11 . The guard 3 prevents chips, cutting fluid, and the like discharged from the machine tool body 11 from scattering to the outside during workpiece machining.

The cover 3 has an operation panel 80 for operating the machine tool 1 on the front right side. The operation panel 80 is formed in a substantially rectangular shape as viewed from the front, and has a keyboard 81 including various keys on the front surface of the operation panel 80 . A CRT (monitor) 89 for displaying setting screens and executing operations is provided above the keyboard 81 .

The keyboard 81 of the operation panel 80 has a plurality of keys and buttons.

The operation panel 80 reflects the operation content of the operator's operation keyboard 81 on the display screen of the CRT 89 . Therefore, a worker can edit an NC program (a machining program created in NC language), tool data, and the like using the keyboard 81 while referring to the display screen of the CRT 89 .

As shown in FIG. 2 , the machine tool main body 11 is fixed to the upper surface of the column seat portion 17 a of the bed 2 . The main body 11 of the machine tool is mainly composed of a column 17b, a spindle head 7, a spindle 9, a tool changing mechanism 20, a workbench 10, and a control panel 19. The column 17b is formed in a substantially square column shape extending vertically upward. The spindle head 7 is raised and lowered along the front surface of the column 17b. The spindle 9 protrudes vertically downward from the lower front side of the spindle head 7 . Tool changing mechanism 20 is positioned at the right side of main shaft head 7, and the cutting tool 6 that is installed on the top of main shaft 9 is changed. The table 10 is located on the upper portion of the base 2, and holds a workpiece in a detachable manner. The control panel 19 is located on the rear side of the column 17b, and accommodates a control device 70 and a power supply device for controlling the machine tool 1. As shown in FIG.

The column 17b has a pair of guide rails (not shown) extending in the vertical direction on the front surface. The guide rail guides the spindle head 7 . The column 17b has a Z-axis motor 86 (see FIG. 4 ) as a servo motor on the upper surface. The Z-axis motor 86 selectively rotates and drives a feed screw (not shown) extending downward in forward and reverse directions, thereby raising and lowering the spindle head 7 .

The spindle head 7 has a spindle motor 8 at the top. To the spindle head 7 , a spindle 9 corresponding to a machining axis is rotatably attached. The tool 6 is mounted on the top of the spindle 9 . The spindle motor 8 drives the spindle 9 to rotate, so that the tool 6 rotates to process the workpiece fixed on the table 10 .

The table 10 is located below the spindle 9 . A jig (not shown) is fixed to the table 10 . The jig fixes the workpiece in such a way that the workpiece can be loaded and unloaded. The support table 12 is located on the lower side of the table 10 . The support stand 12 is formed in a substantially rectangular parallelepiped shape. X-axis conveyance guides (not shown) are formed as a pair and extend in the X-axis direction (left-right direction in FIG. 1 ) on the upper portion of the support table 12 . The X-axis conveyance guide supports the table 10 at the upper part so that the table 10 can move at the upper part. Y-axis conveyance guides (not shown) are formed as a pair and extend along the long axis direction of the base 2 . The Y-axis conveyance guide supports the table 12 at the upper part so that the table 12 can move at the upper part. The table 10 is driven by the X-axis motor 87 on the support table 12 to move in the X-axis direction (left-right direction) along the X-axis conveyance guide. The table 10 is driven by the Y-axis motor 88 on the base 2 to move in the Y-axis direction (depth direction) along the Y-axis conveying guide.

The X-axis motor 87 and the Y-axis motor 88 are servo motors.

As shown in FIG. 3 , the tool changing mechanism 20 has a tool magazine 30 and a tool changing arm 40 .

The tool changing arm 40 grasps the tool holder 60 attached to the main shaft 9 and other tool holders 60 and conveys them. The tool changing arm 40 is mainly composed of an arm portion 42 and an arm rotation shaft 43 . The arm rotation shaft 43 is formed in a cylindrical shape, and is rotated and raised and lowered. The arm rotation shaft 43 has an arm portion 42 at a lower end. The arm portion 42 has holding portions 41 , 41 capable of holding the tool holder 60 at both end portions. The arm rotation shaft 43 is formed parallel to the Z-axis direction. The arm portion 42 rotates around the arm rotation shaft 43 . The tool changing arm 40 has a tool changing motor 27 at the top. The tool changing arm 40 is rotated and raised and lowered by the rotational drive of the tool changing motor 27 .

The tool magazine 30 is formed in a substantially elliptical shape in side view. The tool magazine 30 is used to accommodate a plurality of tool holders 60 mounted with tools 6 . The tool magazine 30 has a transport mechanism (not shown) inside. The conveying mechanism has a plurality of tool pockets 31 capable of respectively accommodating a plurality of knives 6 . Each tool holder 31 maintains the state (accommodated state) in which the tool holder 60 to which the tool 6 is mounted is oriented laterally. The magazine 30 has a magazine motor 26 at the top. A conveying mechanism operated by the rotational drive of the magazine motor 26 conveys a plurality of tool pockets 31 .

The tool magazine 30 has an index opening 32 on the lower end side. At the position of the index opening 32 , the tool holder 31 can rotate the tool holder 60 from the accommodated state (the state facing the lateral direction) to the replaceable state (the state facing the downward direction). Near the indexing opening 32, there is a tool holder lifting mechanism (not shown). The knife pocket elevating mechanism is driven by the air cylinder 28 (see FIG. 4 ), and the knife pocket 31 is rotated to be in an accommodated state or an exchangeable state.

With the tool changing arm 40 positioned at the ATC origin (see FIG. 7 ), the tool 6 mounted on the spindle 9 is changed in the following procedure. The tool changing arm 40 rotates, the holding part 41 on the tool magazine 30 side holds the replaceable tool holder 60 on the tool magazine 30 side, and the holding part 41 on the main shaft 9 side holds the tool holder 60 mounted on the main shaft 9 . Next, the tool changing arm 40 descends to perform a tool extraction operation. Next, the tool exchange arm 40 is rotated by 180 degrees, and the tool holder 60 on the spindle 9 side and the tool holder 60 on the tool magazine 30 side are exchanged. Then, the tool changing arm 40 rises, and the tool holder 60 held by the holding portion 41 on the main shaft 9 side is installed on the main shaft 9, and the tool holder 60 held by the holding portion 41 on the tool magazine 30 side is installed on the tool holder 31 of the tool magazine 30. superior. Next, the tool changing arm 40 is rotated by a predetermined angle, and the gripping portion 41 on the spindle 9 side and the gripping portion 41 on the tool magazine 30 side release the toolholder 60 gripped by each. As above, one cycle of the arm rotation operation performed by the tool changing arm 40 is completed.

The electrical configuration of the machine tool 1 will be described using FIG. 4 . The control device 70 for controlling the machine tool 1 has a CPU 71, a ROM 72, a RAM 73, a nonvolatile storage device 76, an input interface 74, and an output interface 75. The keyboard 81 of the operation panel 80 is connected to the input interface 74 . The CRT89 is connected to the output interface 75 . The CPU 71 executes a control program (described later) to control the machine tool 1 .

The output interface 75 is connected with the Z-axis motor 86 , the X-axis motor 87 , the Y-axis motor 88 , the spindle motor 8 , the tool magazine motor 26 , the tool changing motor 27 , and the air cylinder 28 . Each of the motors 86 to 88, 8, 26, and 27 has encoders 86a to 88a, 8a, 26a, and 27a for detecting rotation angles. The respective encoders 86 a to 88 a, 8 a, 26 a, and 27 a are connected to the input interface 74 and input signals to the control device 70 . The control device 70 controls the respective speeds of the Z-axis motor 86 , the X-axis motor 87 , the Y-axis motor 88 , the spindle motor 8 , the magazine motor 26 , and the tool changing motor 27 based on the signal.

The input interface 74 is connected with a keyboard 81 , an arm sensor 82 , a Z-axis origin sensor 83 , a tool holder up sensor 84 , and a tool holder down sensor 85 . The arm sensor 82 is used to detect the completion of one cycle of the arm rotation operation of the tool changing arm 40 . The operation control of the tool changing arm 40 is performed based on the detection result. The Z-axis origin sensor 83 is used to detect the origin of the spindle head 7 (tool replacement height position of the spindle head 7). The positioning control of the spindle head 7 is performed based on the detection result. The pocket lift sensor 84 is used to detect whether or not the pocket 31 is accommodated. The pocket down sensor 85 is used to detect whether the pocket 31 is in an replaceable state. Lifting control of the pocket lift mechanism (not shown) is performed based on the detection results of the pocket up sensor 84 and the pocket down sensor 85 .

The plurality of pockets 31 have pocket identification plates 78 that move integrally with the pockets 31 . The pocket identification plate 78 has a light-transmitting portion (not shown) having a different pattern for each pocket 31 in order to identify each pocket 31 . The tool magazine 30 has an identification sensor 79 for individually identifying each of the plurality of tool pockets 31 . The recognition sensor 79 has a light projecting element 79a and a light receiving element 79b arranged opposite to each surface of the knife case recognition plate 78. The recognition sensor 79 is used to detect which tool holder 31 is conveyed to the index opening 32 of the tool magazine 30 . Predetermined positioning control of the tool 6 is performed based on the detection result.

The RAM 73 temporarily stores values and the like calculated during the execution of the control program. As shown in FIG. 5, the nonvolatile storage device 76 has a table storage area 76a, a machining program storage area 76b, and the like. The table storage area 76a is used to store the table 170 . The processing program storage area 76b is used to store various processing programs entered and registered by workers. The ROM 72 prestores a control program for executing movement processing (see FIG. 8 ) for moving the spindle head 7 in the Z-axis direction, which will be described later.

As shown in FIG. 6 , the table 170 stores multiple sets of M-code (auxiliary actions) commands 171 , action content 172 corresponding to the commands 171 , and execution time 173 of the actions. In the example in FIG. 6 , the action content of instruction M03 is that the main shaft rotates in the forward direction, and this action is executed at execution time B. The action content of instruction M09 is to stop the cooling pump, and this action is executed at execution time A. The action content of command M436 is tool magazine rotation speed 1, and this action is executed at execution time C. When the command is a 2-bit BCD signal, the action content is BCD signal output, and the action is executed at execution time A. As shown in FIG. 7 , the execution time A is the time when the spindle head 7 reaches the position (point R) where the tool is away from the workpiece while the spindle head 7 is rising to the tool replacement position on the Z axis. Execution time B is the time when the descent from the Z-axis tool replacement position to the R point starts after the tool is replaced. Execution time C is the time when the spindle head 7 starts to descend from the position (point R) where the tool starts machining the workpiece to the Z-axis command position.

In the table 170, the timing at which the operation content of each command is executed can be set arbitrarily in advance. The CPU 71 reads the machining program input by the worker into the machining program storage area 76 b of the nonvolatile storage device 76 , analyzes the machining program with reference to the table 170 , and executes the machining program. A machining program consists of multiple block programs.

Example 1 as an example of a block program will be described below.

Example 1 "G100T1R50.Z0.M10M03M436;"

G100 in the above example 1 is a tool replacement command. T1 is the tool number to be replaced. R50 is the value of point R (Z=50) where the spindle head 7 descends and temporarily stops during single-step motion. Z0 is a command to position the spindle head 7 (Z axis) at 0. When referring to table 170, M10 is not directly stored and is therefore a 2-bit BCD signal. CPU71 outputs BCD signal. When referring to table 170, M03 indicates that the spindle is rotating forward, and the execution time is execution time B. M436 represents tool magazine rotation speed 1, and the execution time is execution time C. Therefore, in Example 1, BCD signal is output at execution time A (M10), spindle forward rotation is executed at execution time B (M03), and tool magazine rotation speed 1 is executed at execution time C (M436).

Example 2 represents another block of program.

Example 2 "G100T1R50.Z0.M10M03M08;"

The description of the same command as in the above-mentioned example 1 is omitted. M08 represents cooling pump operation, and this operation is executed at execution time C. Therefore, in Example 2, the BCD signal is output at execution time A (M10), the spindle is rotated in the forward direction at execution time B (M03), and the cooling pump is operated at execution time C (M08).

The movement process of the spindle head 7 moving in the Z-axis direction during the tool exchange operation will be described with reference to FIG. 7 . When a tool change command is received, the spindle head 7 rises from the origin Z=0 in the Z-axis direction, and reaches point R (Z=50) at execution time A. The tool 6 moves away from the workpiece at execution time A. When the spindle head 7 rises until the moment A is executed, the tool does not interfere with the workpiece and the fixture. The spindle head 7 further continues to rise from the execution time A, and the spindle head 7 rises to the ATC origin (execution time A1 ) which is a tool exchange position where a tool can be replaced. Using the tool changing mechanism 20, the tool is replaced from the execution time A1, and the tool replacement is completed at the execution time B. Next, the spindle head 7 descends to reach point R at execution time C, and further descends to the commanded position on the Z-axis.

Parallel execution processing of other processing in the control of the tool replacement operation by the CPU 71 will be described with reference to the flowchart of FIG. 8 . The worker uses the keyboard 81 (see FIG. 1 ) to instruct to execute the processing program. The CPU 71 reads and executes the machining program stored in the machining program storage area 76 b (see FIG. 5 ) of the nonvolatile memory device 76 .

The CPU 71 reads and interprets one block program of the machining program (S1). In S1 , the CPU 71 refers to the table 170 to read the content and execution time of each command, sorts the command content in order of execution time, and stores it in the RAM 73 .

The CPU 71 judges (S2) whether the interpreted command of one block program is an end command (M30). When the command is an end command (M30) (S2: YES), the CPU 71 ends the processing. When the command is not an end command (M30) (S2: NO), the CPU 71 judges whether the command is a tool replacement command (S3). When the command is a tool change command (S3: YES), the CPU 71 starts a tool change operation (S4). When the command is not a tool replacement command (S3: No), the CPU 71 executes processing according to block program commands such as an axis movement command or a cutting command (S8). After the CPU 71 sets the block program to be interpreted as the next block program, it returns to S1 and repeats the process.

When executing the tool replacement operation of S4, the CPU 71 executes Z-axis ascending processing. The Z-axis raising process is a process in which the spindle head 7 is raised from the current position to the tool replacement position (ATC origin) via the R point. The CPU 71 judges whether or not the execution time A has been reached (S5). When the spindle head 7 is raised to the R point in the Z-axis raising process, the CPU 71 judges that the execution time A has been reached (S5: YES). When the spindle head 7 has not risen to the R point (S5: NO), the process returns to the judgment process of S5. When the spindle head 7 rises to point R, the CPU 71 judges whether there is an instruction executed at the execution time A among the contents of the instructions stored in the RAM 73 in the one-block program reading process in S1 (S6). When there is an instruction executed at the execution time A (S6: YES), the content of the instruction executed at the execution time A is executed (S7). In the case of the above-mentioned example 1 and example 2, since the instruction executed at the execution time A is M10, a BCD signal is output.

When the instruction execution (S7) ends, the process returns to the judgment process of S6. When all the commands to be executed at the execution time A are completed (S6: No), the CPU 71 judges whether or not the execution time B at which tool replacement has been completed has come (S9). Execution time B is when the spindle head 7 rises from point R and reaches the ATC origin (execution time A1), the tool changing mechanism 20 executes the tool change, and the tool change ends. When the execution time B has not been reached (S9: No), the process repeats the determination process of S9 and waits until the execution time B is reached. When the execution time B is reached (S9: YES), the CPU 71 judges whether there is an instruction to be executed at the execution time B among the contents of the instructions stored in the RAM 73 in the one-block program reading process in S1 (S10). When there is an instruction executed at the execution time B (S10: YES), the CPU 71 executes the content of the instruction executed at the execution time B (S11). In the case of the above-mentioned examples 1 and 2, since the command executed at the execution time B is M03, the spindle 9 is rotated in the forward direction.

When the execution of the instruction of S11 ends, the process returns to the judgment process of S10. When all the instructions to be executed at the execution time B are completed (S10: No), the CPU 71 judges whether or not it is the execution time C (S12). The execution time C is the time when the spindle head 7 descends to the point R where the tool comes into contact with the workpiece to process the workpiece. When the execution time C has not been reached (S12: No), the process repeats the determination process of S12 and waits until the execution time C is reached. When the execution time C is reached (S12: YES), the CPU 71 judges whether there is an instruction to be executed at the execution time C among the contents of the instructions stored in the RAM 73 in the one-block program reading process in S1 (S13). When there is an instruction executed at the execution time C (S13: YES), the CPU 71 executes the content of the instruction executed at the execution time C (S14). In the above example 1, since the command executed at execution time C is M436, the tool magazine is rotated at the tool magazine rotation speed 1. In the case of the above-mentioned example 2, since the command executed at the execution time C is M08, the cooling pump is operated.

When the instruction execution of S14 ends, the process returns to the judgment process of S13. When all the commands to be executed at the execution time C are completed (S13: No), the CPU 71 judges whether or not the tool replacement operation has been completed (S15). This determination is made based on whether or not all operations included in the tool change command have been completed. When the tool changing operation ends (S15: YES), the process returns to S1. If the tool replacement operation is not completed (S15: No), the process repeats the determination process of S15 and waits until the tool replacement operation is completed.

In the above description, the CPU 71 of the control device 70 corresponds to the control unit of the present invention. The spindle motor 8 corresponds to the spindle drive unit of the present invention. The Z-axis motor 86 corresponds to the spindle head moving unit of the present invention. The table 170 corresponds to the storage unit of the present invention. Execution time A corresponds to the first execution time of the present invention. Execution time B corresponds to the second execution time of the present invention. The execution time C corresponds to the predetermined execution time of the present invention. The ROM 72 is a storage medium for the control program.

As described above, the machine tool 1 of the present embodiment can automatically execute these commands at an appropriate timing when a tool change command and a command to be executed in parallel are issued at the same time, so that the tool change cycle can be shortened.

Various modifications can also be implemented to the numerically controlled machine tool and control method of the present invention. For example, the execution time 173 of the table 170 may be changed by operating the keyboard 81 of the operation panel 80 . The execution time may be set to an execution time other than the three execution times A, B, and C. For example, it is the time when the spindle head 7 starts to rise from the Z=0 position to the R point.

In the above-mentioned embodiment, the vertical machine tool 1 was exemplified, but the present invention can also be applied to a horizontal machine tool. The tool changing mechanism 20 may also be a mechanism of another type. For example, it may be a turret system in which the tool holder can be detached and attached in conjunction with the lifting operation of the spindle head 7 .

The execution time A is the time when the spindle head 7 reaches the R point in the Z-axis raising process. This moment can be judged according to the moving direction of the Z axis and the position of the Z axis. This timing may also be determined from the time elapsed after the Z-axis rises.

Execution time B is the time when the tool change ends. The end of the tool replacement is determined based on the detection of the arm sensor 82 . The end of the tool change can also be judged based on the elapsed time from the start of the tool change.

Execution time C is the time when the spindle head reaches point R after tool change. This moment can be judged according to the moving direction of the Z axis and the position of the Z axis. This timing may also be determined based on the time elapsed after the Z-axis descends.

Claims (2)

1. a lathe (1), it comprises: main shaft drives portion (8), and its main shaft (9) for driving with cutter rotates; Main tapping moving part (86), it is for making main tapping (7) mobile, and this main tapping (7) makes above-mentioned main shaft (9) can support this main shaft (9) rotatably; Cutter changing device (20); Control part (71), it controls above-mentioned main shaft drives portion (8), above-mentioned main tapping moving part (86) and above-mentioned cutter changing device (20) according to the job sequence being stored in storage part (76), wherein,

The block program formed in multiple pieces of programs of above-mentioned job sequence at least has cutter changing instruction and auxiliary movement instruction,

Above-mentioned storage part comprises job sequence storage area (76b) and form storage area (76a), above-mentioned job sequence is stored at this job sequence storage area, the many groups of groups movement content of above-mentioned auxiliary movement instruction, this instruction and the execution moment of this action formed with corresponding to each other are stored at this form storage area

In the above-mentioned execution moment, there is the first execution moment (performing moment A), second to perform moment (performing moment B) and the 3rd execution moment (performing moment C),

First to perform the moment (perform moment A) be above-mentioned main tapping (7) when arrive in the uphill process of cutter changing position above-mentioned cutter (6) leave the position of workpiece when,

Second perform the moment (perform moment B) be when start after changing cutter from above-mentioned cutter changing position to the position carrying out processing decline when,

3rd to perform the moment (perform moment C) be the moment that position that above-mentioned main tapping (7) starts to carry out above-mentioned processing to above-mentioned workpiece from above-mentioned cutter (6) declines to the location of instruction,

Above-mentioned control part (71) performs the above-mentioned auxiliary movement corresponding with above-mentioned instruction according to the above-mentioned execution moment.

2. a control method for lathe, this lathe comprises: main shaft drives portion, and it rotates for driving the main shaft with cutter, main tapping moving part, it moves for making main tapping, and this main tapping enables above-mentioned main shaft support this main shaft rotatably, cutter changing device, control part, it controls above-mentioned main shaft drives portion according to the job sequence being stored in storage part, above-mentioned main tapping moving part and above-mentioned cutter changing device, the block program formed in multiple pieces of programs of above-mentioned job sequence at least records cutter changing instruction and auxiliary movement instruction, above-mentioned storage part comprises job sequence storage area and form storage area, above-mentioned job sequence is stored at this job sequence storage area, many groups are stored by above-mentioned auxiliary movement instruction at this form storage area, the group that execution moment of the movement content of this instruction and this action forms with corresponding to each other,

In the above-mentioned execution moment, there is the first execution moment, second to perform moment and the 3rd execution moment,

First to perform the moment be above-mentioned main tapping when arrive in the uphill process of cutter changing position above-mentioned cutter leave the position of workpiece when,

Second perform the moment be when change to start after cutter from above-mentioned cutter changing position to the position carrying out processing decline when,

3rd to perform the moment be the moment that position that above-mentioned main tapping starts to carry out above-mentioned processing to above-mentioned workpiece from above-mentioned cutter declines to the location of instruction,

This control method is the control method utilizing the above-mentioned control part of lathe to carry out, wherein,

Computing machine as control part performs the above-mentioned auxiliary movement corresponding with above-mentioned instruction according to the above-mentioned execution moment.