JPH0741442B2 - Numerical control device with tool compensation amount input function - Google Patents

Description

The present invention relates to a numerically controlled lathe having a tool correction input function for a numerically controlled lathe. More specifically, in a facing spindle type numerically controlled lathe having two facing spindles and three tool rests, three touch sensor for tool compensation for inputting the tool compensation amount of the tool attached to each tool rest. The present invention relates to a numerical control device having a tool compensation input function for a counter-spindle type numerical control lathe having the above.

[Prior Art] The numerical control (NC) lathe tool is a new type of work piece processing, and when the tool setup change occurs, the tool is replaced with a new tool or chip due to tool damage or tool life. At this time, if the cutting process is performed as it is, an error occurs in the machining size of the work due to the variation in the size between the tools, so that it is necessary to rewrite the tool correction amount in the memory for the tool correction. This tool compensation amount can be input by calculating the tool compensation amount from the result of trial cutting and manually inputting it to the tool compensation memory from the NC device keyboard, but let's compensate with the touch sensor provided on the lathe. There is also a method in which a tool correction amount is obtained from the contact position by automatically applying the correction amount to the tool correction memory by hitting the blade edge of the tool.

For NC lathes that have two machining spindles that face each other and that simultaneously machine a workpiece with these two machining spindles and that have three turrets, one of the turrets (hereinafter referred to as the third turret) The present applicant has already proposed), which supports machining of the work on the first spindle side or the second spindle side according to the load of the machining process.

Normally, an NC lathe is equipped with one touch sensor on one turret. This touch sensor detects a contact signal in the two-axis direction (X, Z) which is the moving direction of the tool rest, and corrects the position information at that time by calculating the difference from the position information of the reference tool as a tool correction amount. The input operation of the tool correction amount is performed for each tool attached to each tool rest each time the tool correction amount is obtained.

On the other hand, the third turret proposed by the applicant of the present invention has a coordinate system between the first spindle and the first turret and a second spindle in order to support machining on the first spindle side or the second spindle side. The position is controlled in two coordinate systems, that is, the coordinate system with the second turret. For this reason, the third tool post uses the same tool at two indexing positions, so there are two tool correction amounts when the cutting edge is directed toward the first spindle side and when the cutting edge is directed toward the second spindle side. It had to be set in the tool compensation memory in the NC unit, which was a complicated operation.

[Problems to be Solved by the Invention] The present invention achieves the following objects from the technical background described above.

An object of the present invention is to provide a counter-spindle type numerically controlled lathe having two spindles and three turrets, by indexing the tool of the third turret with a 180 degree index when the cutting edge is directed to the first spindle side. X between the two blade edges when the blade edge is directed toward the 2 spindle side
When the relative dimension difference in the axis and Z-axis directions is obtained and this is parameterized and the tool correction amount is obtained by using the touch sensor on the first spindle or the second spindle, it is automatically compared with the first spindle side and the second spindle. It is an object of the present invention to provide a numerical control device having a tool correction amount input function of a counter-spindle type numerical control lathe for setting both tool correction amounts on the spindle side.

[Means for Solving the Problems] The following means are adopted to solve the problems.

A first spindle that is rotatably supported in the first spindle stock; a first tool post that is provided corresponding to the first spindle and is capable of mounting a plurality of tools; and a first spindle head that faces the first spindle stock. A second spindle that is rotatably supported in the two spindle stocks, and a second tool rest that is provided so as to face the second spindles and that is capable of mounting a plurality of tools on the first spindle and the second spindle. A counter-spindle type numerically controlled lathe having a third turret to which a plurality of tools can be attached, the first turret being swingably provided on or near the first headstock. A first touch sensor having a contact portion that sends a contact signal when contacting the blade edges of a plurality of tools, and a plurality of the second tool rests provided on the second spindle head or in the vicinity thereof in a swing motion state. Contact part that sends a contact signal when it comes into contact with the blade edge of And a second touch sensor, which is swingably provided in or near the first headstock or the second headstock, and sends a contact signal when the tool tips of a plurality of tools of the third tool post are contacted. A third touch sensor having a contact portion for performing axial movement of the first headstock or the first tool post, axial movement of the second headstock or second tool post, and the third tool post having an axis. A current position memory that stores and holds the coordinate values of each axis when moving, and a current position memory that is provided corresponding to the plurality of tools of the first, second, and third turrets, and stores the tool correction amount of each tool And a position for sending a contact signal by contacting the first, second and third touch sensors from the machine origin or virtual origin of the reference tool attached to the first, second and third turrets. The coordinate values up to
2, a parameter memory for storing and holding corresponding to the third and third turrets, and the first, second and third touch sensors from the mechanical origin or virtual origin of the plurality of tools of the first, second and third turrets Tool correction calculation means for calculating a tool correction amount from the coordinate value up to the position at which the touch signal is transmitted and transmitting the contact signal and the coordinate value in the parameter memory, and writing the tool correction amount in the tool correction memory; A numerical control device having a tool correction amount input function, which comprises a central processing unit for controlling.

The tool attached to the third turret has a tool correction memory used when supporting the machining of the first spindle and a tool correction memory used when supporting the machining of the second spindle, It is effective to input the tool correction amount in the tool correction memory area by contacting the third head sensor provided on or near the one headstock or the second headstock.

[Operation] The tool compensation amount of each tool attached to the 1st turret, 2nd turret or 3rd turret is brought into contact with any of the 1st, 2nd and 3rd touch sensors and the reference tool at that time The tool correction amount obtained from the position difference is set to a predetermined address of the tool correction memory in the numerical controller.

As for the tool correction amount of the tool of the third turret, the tool correction amount obtained by the third touch sensor attached to either the first spindle side or the second spindle side is used as the tool compensation memory on the first spindle side. The numerical control device has a tool correction input function for setting the same numerical value in the tool correction memory on the second spindle side.

[Embodiment] Hereinafter, FIG. 1 is a development view of an opposed main spindle type numerically controlled lathe, and the structure and the names of the reference numerals of the axis lines used therefor will be described. A first headstock 1 is provided at one end on a bed (not shown). The first headstock 1 does not move on the bed. A first spindle 2 is rotatably supported in the first spindle stock 1. A first chuck 3 for gripping a work is attached to the tip of the first spindle 2.
The first spindle 2 is rotationally driven by a motor (not shown) provided in the first headstock 1.

A second headstock 4 is provided on the bed at a position facing the first headstock 1. The second headstock 4 is provided on a bed on a guide surface (not shown) so as to be movable in the second spindle axis direction. The drive control of the second headstock 4 is performed by the Z2 servo motor 7 via a feed screw (not shown). This direction of movement is referred to herein as the Z2 axis. A second spindle 5 is rotatably provided in the second spindle stock 4.
A second chuck 6 is provided at the tip of the second spindle 5. The second spindle 5 is rotationally driven by a motor (not shown) in the second spindle stock 4.

On the upper part of the bed, a first turret 8 is movably provided on a guide surface (not shown) formed on the bed.
The first tool rest 8 moves on the bed in the axial direction of the first spindle 2 and a first carriage (not shown), and moves on the first carriage in a direction orthogonal to the first spindle axis direction. It comprises a first cross slide 9 and a turret body 10 provided on the first cross slide 9 to which a plurality of tools can be attached.

The first carriage is driven and controlled by a Z1 servomotor 11 on a horizontal guide surface on the bed in the direction of the axis parallel to the first spindle 2, that is, the Z1 axis direction via a feed screw. Further, the first cross slide 9 is driven in the X1 axis direction perpendicular to the Z1 axis line, that is, in the radial direction of the work held by the first chuck 3. The first cross slide 9 is drive-controlled by an X1 servomotor 12 via a feed screw.

On the bed, a second tool rest 15 is further provided facing the first tool rest 8 on the same horizontal guide surface. 2nd turret 15
The structure is substantially the same as the structure of the first turret 8 and the function is substantially the same except that the direction of the axis is different, and therefore the description thereof will be omitted. However, the second turret 15
Is not moved in the Z2 axis direction, and is driven and controlled by the X2 servo motor 16 in the X2 axis direction. The third tool rest 20 is a tool rest on the front surface of the bed to which a plurality of tools can be attached.

A carriage (not shown) is first on the guide surface on the front of the bed.
It is movably installed in the direction parallel to the main axis (Z3 axis). The carriage is driven and controlled by the Z3 servo motor 21. A third cross slide 22 is further provided on the carriage so as to be movable in the X3 axis direction on the X3 guide surface. Third
Cross slide 22 is an X3 servo motor via a feed screw.
Driven by 23. A third turret main body 24 is provided on the third cross slide 22 so as to be freely indexed and positioned.

A tool is attached to the outer periphery of the cylindrical third turret body 24. The third turret 20 includes the first chuck 3 and the second chuck 3.
The purpose is to assist the machining of the workpiece attached to the chuck 6, that is, the first tool post 8 and the second tool post 15. Specifically, machining sharing of inner and outer diameter processes, multi-blade cutting of outer diameter machining (processing that outer diameter machining is performed with two tools at the same time), support such as thread cutting, measurement support, bar material feeding device Supports processing such as bar stoppers when attached.

Control Method A control method of each axis configured as described above will be described. Here, the first series of numerical control devices refers to machining with the first main spindle 2 by the first turret 8, and the controlled axis is the first turret 8.
The X1 axis and Z1 axis of are controlled. Similarly, the second series is the machining on the second spindle 5 by the second turret 15, and the X2 axis and the Z2 axis are controlled, and the third series is the X3 axis and the Z3 axis of the third turret 20 are controlled. It The third turret 20 supports the machining of the first spindle 2 or the machining of the second spindle 5, and therefore the series is switched depending on the machining. As mentioned above (X1 axis Z3
Axis), (X2 axis and Z2 axis), (X3 axis and Z3 axis), and the rotary axis centering on the axis of each main axis, position interpolation control is possible by the function of the numerical controller.

Tool compensation amount input calculation device FIG. 3 shows a numerical control device 30 having a tool compensation amount input function.
It is a functional block diagram showing. The CPU 31 is a well-known central processing unit that controls the entire numerical control device. CPU31
The following input / output devices are connected to the via a bus 32. The interface 33 is an external touch sensor 27,2.
8, 29, for input from the manual pulse generator 34, etc. The first, second and third touch sensors 27, 28 and 29 are for outputting a contact signal at this moment when the tool T attached to the first, second and third turret tool post 8, 15, 20 comes into contact therewith. .

These 1st, 2nd and 3rd touch sensors 27, 28 and 29 are + and + in the X and Z axis directions.
It is detected that the contact is made from both directions of-, that is, from four directions. The programmable controller 35 includes
Sequence program to control the moving ends of 1,2,3 turret turrets 8,15,20, limit switches provided at the machine origin, and hydraulic / pneumatic equipment and lubrication equipment at each part of the NC lathe provided on the manual operation panel Is a sequence controller.

An input signal is input to the programmable controller 35 from a switch 36 such as a feed button switch and a stop button switch. In addition, it outputs to the output device 37 such as a solenoid for operating the hydraulic / pneumatic equipment and an indicator lamp showing the status such as origin return, program starting, etc., and performs sequence control. The turret control circuit 38 includes the first, second and third turrets 8,15,
It controls the indexing of 20 turrets. ROM39
Is for storing and retaining programs, data, etc. for operating the numerical control device.

The RAM 40 is for temporarily storing data during calculation. The current position memory 41 is the first, second, and third
It is a memory for storing and holding the current position of each axis of each machine coordinate system and work coordinate system of the turret 8, 15, 20, and the current position data stored in this current position memory 41 is changed by the movement of each axis. It is constantly being rewritten. The parameter setting memory 42 stores XP, ZP parameter data such as the distances between the reference tools attached to the 1st, 2nd and 3rd turrets 8, 15 and 20 and the 1st, 2nd and 3rd touch sensors. Hold.

The tool correction memory 43 stores the tool correction amounts of the respective tools of the first, second and third turrets 8, 15, 20. The tool correction amount is calculated by the tool correction calculation means 45 when a contact signal is input from the touch sensor, and the data is rewritten. In the input / output device 44, a CRT 49 that is a display means represents a keyboard that is an input means, and the CRT 44 and the keyboard 49 display and edit necessary programs and data.

The tool correction calculation means 45 includes the first, second and third touch sensors 27, 28, 29.
The position information of a predetermined axis when a contact signal is output from the device is read, and the output of the moving axis discriminating circuit 48 that specifies which series X, Z axis movement and + or-movement direction is read, and the movement is performed. The parameter data corresponding to the direction is read from the parameter memory 42, calculated with the position information to obtain the tool correction amount, and the tool correction amount is written in a predetermined address of the tool correction memory 43. The servo motor 49 of each axis is controlled by the axis control 46 via the servo amplifier 47, and the tacho generator
The speed and position information from 49a and pulse encoder 49b is fed back.

Tool Correction Amount Calculation Method FIG. 2 is an explanatory diagram illustrating a method of calculating the tool correction amount of the tools attached to the first, second, and third turrets 8, 15, 20.

Parameter memory XP1 to XP7, ZP1 to Z corresponding to each turret
It is assumed that data is set in advance in P7.
Here, XP1 to XP6 come into contact with the center of the inner diameter tool mounting hole or the reference tool blade edge position in the X-axis direction from the machine origin to the contact parts of the first, second and third touch sensors 27, 28, 29. It is the distance to the position where the signal is transmitted (coordinate value in the machine coordinate system). ZP
1 to ZP6 is the distance from the machine origin to the position at which the contact point of the first, second and third touch sensors 27, 28, 29 is contacted and the contact signal is sent out, in the Z direction of the reference tool edge position. (Coordinate value of machine coordinate system).

ZP7 is the dimension between the two positions in the Z-axis direction when indexing 180 ° from the reference tool 0 ° attached to the third turret 20, and includes a slight indexing error of the third turret 20. . XP7 is the amount of change in the X-axis direction when the reference tool attached to the third turret 20 is indexed from 0 ° to 180 °, and is a subtle indexing error of the third turret 20.

The tool correction amount is the difference in blade edge position between the reference tool and the target tool, and the tool correction calculation formula is as follows.

X, Z-axis common tool compensation amount = | Parameter value of reference tool |-| Machine coordinate value of touch sensor of target tool when sending contact signal | The numerical value calculated by this formula is written in the tool compensation memory 43. Be done.

A method of calculating the tool correction amount of the tool attached to the first turret 8 will be described. A direction (X-axis direction) orthogonal to the axial direction of the main shaft 2
Until the inner diameter tool mounting hole center (IT1) position of the first turret 8 moves from the machine origin and reaches the contact signal sending position on the inner diameter side contact surface (“+ X” contact surface) side of the touch sensor 27. Machine coordinate value (diameter value) XP4 and outer diameter side contact surface ("-
The mechanical coordinate value (diameter value) XP1 until reaching the contact signal sending position on the X "contact surface side is the standard dimension.

Further, in the spindle axis direction (Z-axis direction), the blade edge position of the reference tool TP1 attached to the first tool post 8 in the Z-axis direction moves from the machine origin, and the spindle side contact surface of the touch sensor 27 (“+ Z” contact). Machine coordinate value ZP until reaching the contact signal sending position on the
4 and the machine coordinate value ZP1 until reaching the contact signal sending position on the non-spindle side contact surface ("-Z" contact surface) side are the standard dimensions.

The tool correction amount of the outer diameter tool T01 attached to the first tool rest 8 is calculated as follows. Where this outer diameter tool T0
The machine coordinate value until 1 touches the touch sensor 27 is XT1, Z
T1. The data of XP1 and ZP1 is read from the parameter memory from the axial movement direction when the touch sensor 27 is contacted.

The tool compensation amount is calculated as OFX1 = | XP1 | − | XT1 | OFZ1 = | ZP1 | − | ZT1 |.

Since the method of calculating the tool correction amount of the second turret 15 is the same as that of the first turret 8, detailed description thereof will be omitted.

The tool compensation amount of the outer diameter tool T21 attached to the second turret 15 is calculated as OFX2 = | XP5 | − | XT2 | OFZ2 = | ZP2 | − | ZT2 |.

A tool correction calculation method for the third turret 20 will be described. The third turret 20 may support machining on the side of the first spindle 2 and sometimes support machining on the side of the second spindle 5. Therefore, the T code is 2
In addition to proper use, two tool correction group numbers will be provided.

The tool correction amount on the first spindle 2 side of the third turret 20 is calculated as follows.

OFX3 = | XP3 | − | XT3 | OFZ3 = | ZP3 | − | ZT3 | Further, the above XP7 and ZP7 are stored and held in the parameter memory 42, and the origin position of the second tool post 15 and the third tool Since the dimension between the origin positions of the table 20 is known and is stored and held in the parameter memory as the parameter PZ, the tool correction amount OFX3, OFZ set by the third touch sensor 29 is set.
The numerical value of 3 is the same as the tool offset of the second spindle 5 side OFX4, OFZ4
Can be used as Therefore, OFX with the third touch sensor 29
When setting 3, OFZ3, OFX4, OFZ4 can also be set and input.

Operation The tool compensation amount input calculation device and touch sensor are
Outline Used and operated as follows.

Checking the return-to-origin state Select the series selection switch 50 to select the moving axis according to the number of the turret for tool compensation. For example, the third
When performing tool compensation for tools attached to the turret, series 3
Select.

Check whether the axis of the selected tool post has returned to the machine origin and the display of the position information of the machine coordinate system is zero. If the origin return has not been performed or the display is not 0, the origin return operation is performed by manual operation.

Set the touch sensor in the operating state Since the first, second and third touch sensors 27, 28, 29 are provided on the swingable arm of the first headstock or the second headstock,
After retracting all turrets to a position that does not interfere, swing this arm down manually.

When the arm is swung down, the NC device enters the tool compensation mode, and the tool compensation screen for each turret as shown in FIG. 5 of the CRT screen is selected by the arm and the sequence selection switch 50, and either one is displayed. .

Call the tool that performs tool compensation Call the tool on the tool post that intends to perform tool compensation to the machining position by indexing the turret. This operation is also performed in the manual mode. The cursor also moves on the screen from the screen according to the indexed tool surface.

Confirmation of tool surface and compensation number Since the tool compensation screen is called on the CRT44, confirm that the tool compensation number displayed by the cursor and the number of tool indexing surfaces match.

Move the tool edge closer to the touch sensor.

The feed button switch (not shown) of the manual operation panel and the manual pulse generator 34 are operated to bring the tool edge closer to the touch sensor and to position the tool edge at a position facing the contact portion at the substantially central portion of the touch sensor. (Fig. 4).

Contact between the tool edge and the touch sensor When the tool edge contacts the touch sensor and a contact signal is output, a touch sound is generated and the movement of the tool rest (tool) stops. Then, the position information (mechanical coordinate system) when the contact signal is output is read from the current position memory 41 by the tool correction means 48. Further, when the touch sensor is brought into contact with the touch sensor, the movement axis and the movement direction are read by the tool correction calculation means 45 from the movement axis discrimination circuit 48. The parameter data of the reference tool stored in the parameter memory 42 is specified by the moving axis and the moving direction, and the data is read. The position information and the parameter data are calculated to obtain the tool correction amount, which is written in the tool correction memory 43.

Retract the turret Manually retract the turret.

When the correction input of another tool is performed, the above operations 1 to 5 are repeated. If there is no tool to input the tool correction, the arm is returned to the original position.

[Other Embodiments] The above-described embodiments are numerical control lathes having two spindles and three tool rests. However, any type of numerically controlled lathe having two spindles and three turrets can be applied to other types. That is, the movement of the shaft is not limited to the above-mentioned embodiment, but may be applied to the movement of the first headstock or the movement of the second tool post in the two axial directions.

Although the coordinate values used for the tool correction calculation have been described using the coordinate values of the machine coordinate system rather than the machine origin, the coordinate system of the virtual origin may also be used, in other words, the reference tool and the tool for tool compensation are common. Anything can be used as long as it can be calculated by the coordinate system numerical value from the origin of.

[Effects of the Invention] As described in detail above, since the present invention is provided with a touch sensor corresponding to each turret and is related to the coordinate position of the tool of each turret, the third turret With respect to the table, one tool correction input operation can automatically input the tool correction amount to the tool correction memories for both the first spindle support and the second spindle support.

When the arm fixing the touch sensor is swung from the retracted position to the tool correction position, the tool correction screen for inputting the tool correction is automatically selected and displayed according to the position of the series selection switch. As a result, even if there are a plurality of turrets for tool correction, input errors are eliminated and the operation is not complicated.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the arrangement of each headstock and turret, and FIG. 2 is an explanatory diagram showing the calculation processing of the tool correction amount of each turret.
FIG. 3 is a functional block diagram showing this numerical controller, and FIG.
FIG. 5 is a diagram showing a contact state between the touch sensor and the tool, and FIG. 5 is a diagram showing a screen example of the tool correction mode. 1 ... 1st headstock, 2 ... 1st spindle, 3 ... 1st chuck, 4 ... 2nd headstock, 5 ... 2nd spindle, 6 ... 2nd chuck, 7 ... Z2 servo motor , 8 …… 1st turret, 11
…… Z1 servo motor, 12 …… X1 servo motor, 15 …… Second turret, 16 …… X2 servo motor, 20 …… Third turret,
27 …… First touch sensor, 28 …… Second touch sensor, 29
…… Third touch sensor, 41 …… Current position memory, 43 ……
Tool compensation memory, 45 ... Tool compensation calculation means,

Claims (2)

[Claims] 1. A first rotatably supported in a first headstock.
A main spindle, a first tool post provided corresponding to the first main spindle, to which a plurality of tools can be attached, and a second main spindle rotatably supported in a second main headstock facing the first main spindle stock. And a second tool post provided facing the second spindle and capable of mounting a plurality of tools, provided so as to correspond to the first spindle and the second spindle, and capable of mounting a plurality of tools. In an opposed spindle type numerically controlled lathe having three tool turrets, the contact signal is sent when it comes into contact with the cutting edges of a plurality of tools of the first tool turret, which is swingably provided on or near the first head stock. A first touch sensor having a contact portion that performs contact, and a contact that is provided at or near the second headstock in a swinging motion and sends a contact signal when the tool tips of a plurality of tools of the second tool post are contacted. Second touch sensor having a portion, and the first spindle A third touch sensor that has a contact portion that is swingably provided on or near the table or the second headstock and that sends a contact signal when it contacts the cutting edges of a plurality of tools of the third tool post; When the first headstock or the first turret is axially moved, when the second headstock or the second turret is axially moved, and when the third turret is axially moved, the coordinate value of each axis is calculated. A current position memory for storing and storing, a tool correction memory provided for the plurality of tools of the first, second, and third turrets and storing and storing the tool correction amount of each tool; The coordinate values from the mechanical origin or virtual origin of the reference tool attached to the second and third turrets to the position at which the first, second and third touch sensors are contacted and the contact signal is transmitted, respectively
2, a parameter memory for storing and holding corresponding to the third and third turrets, and the first, second and third touch sensors from the mechanical origin or virtual origin of the plurality of tools of the first, second and third turrets Tool correction calculation means for calculating the tool correction amount from the coordinate value up to the position at which the touch signal is transmitted and transmitting the contact signal and the coordinate value in the parameter memory, and writing the tool correction amount in the tool correction memory, the memories and the means. A numerical control device having a tool correction amount input function, which comprises a central processing unit for controlling and controlling the tool. 2. The tool according to claim 1, wherein the tool attached to the third turret has a memory area used for supporting the machining of the first spindle and for supporting the machining of the second spindle. The tool correction memory is provided, and the tool correction amount is input to the tool correction memory by contacting the third touch sensor provided on or near the first headstock or the second headstock. Numerical control device having a tool correction amount input function characterized by the above.