JPH0288147A - Nc turning machine tool with auxiliary measuring device and coordinate axis arithmetic device thereof - Google Patents

Abstract

PURPOSE:To measure W axis and Z axis correctly and quickly and to perform an optimum correction by equipping an auxiliary measuring device by adding to a main measuring device measuring the tool edge tip of a main cutting tool post, and taking up the correction value of the auxiliary cutting tool post or auxiliary chuck. CONSTITUTION:For the main chuck of the NC machine tool equipped with a main measuring device, a main cutting tool post processing a work and the auxiliary chuck 6 capable of moving on a Z axial line in opposition onto the main shaft axial line are provided and also auxiliary cutting tool post 5 equipped with the tool 4 having a rotary center on the same axial line is provided. Moreover, an auxiliary measuring device 12 performing the measurement of the claw reference face 9 of the auxiliary chuck 6 or the tool edge tip position of the auxiliary cutting tool post 5 is provided on a main cutting tool post, excepting the main measuring device measuring the tool edge tip of the main cutting tool post, and these claw correction values and tool correction value are calculated. Consequently, the reference measurement value measured by a main measuring device and the measurement value of W axis by auxiliary measuring device 12 are operated to find the correction value of the respective coordinate axis.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coordinate axis calculation device for an NC turning machine tool with an auxiliary measuring device. More specifically, N
An auxiliary chuck is provided on the main chuck of the C-turning machine tool so that it can move forward and backward in opposition to the main chuck, and an auxiliary tool rest equipped with a tool having a rotation center on the same axis is provided, and the jaws of these auxiliary chucks are The present invention relates to a coordinate axis calculation device for an NC turning machine tool with an auxiliary measuring device that measures the position of a tool cutting edge on a reference surface or an auxiliary tool rest, and calculates a sub-turret tool correction value and a sub-spindle pawl correction value.

[Prior art] In the case of an NC lathe, the X and Z coordinate axes are set on the machine,
This intersection is called the "program origin." For the X-axis, the center line of the spindle is at "X○", and for the Z-axis, the finished end surface of the work on the tailstock side is at rZOJ. The tool movement is based on this program origin, along both the x and Z axes.
, a "minus" sign is attached to command the movement position of the tool.

On the other hand, the machine origin is a machine-specific position, and the machine origin, which is the basis of the program, is provided at the backward end of each axis. This mechanical origin uses, for example, electrically coincident points (grid points) to cause the servo motor to stop at a certain position.

Some NC turning machine tools are equipped with a main measuring device in the X and Z axis directions to measure the relative position of the program origin and machine origin for measuring the tool cutting edge position or chuck jaw reference plane. many. Usually, this main measuring device is swingably provided with its base end fixed to a member that does not move, such as a headstock.

The measured X and Z values thus measured are calculated to determine the tool cutting edge position or chuck jaw reference plane position, and are used for correcting the position of the tool or chuck jaw.

The invention tries to solve 8! l! However, for example, in an NC turning machine tool that has two main spindles facing each other and a chuck provided thereon, the position of the cutting edge of a drill provided in an auxiliary tool rest separately from the main tool rest, or the jaw reference of the auxiliary chuck The coordinate value of the surface is W parallel to the Z axis.
You are using axis display. Since the origin of the W axis is different from the Z axis, the coordinate position is different from the Z axis even if the axes are parallel. A W-axis auxiliary measuring device for this purpose is usually not provided. Furthermore, the W-axis of the program for the auxiliary tool rest and the auxiliary chuck is indicated by the Z-axis, and the origin is different from that of the main tool rest.

For this reason, when chucking a workpiece, the end face changes and the sign of increase or decrease may be mistaken.

For this reason, there has been a problem in terms of ease of use, as it is easy to erroneously display signs indicating increases or decreases, which reduces operability for the operator. Furthermore, since the fixed main measuring device has a limited measurable range, it is difficult to measure in the W-axis direction in a type equipped with an auxiliary chuck and an auxiliary tool rest. For this reason, indirect measurement methods such as measuring the cut workpiece must be adopted. The purpose of this invention is to solve these problems.

An object of the present invention is to provide an NC turning machine tool that is equipped with an auxiliary measuring device in addition to a main measuring device, and is capable of taking in correction values for an auxiliary tool rest or an auxiliary chuck.

A further object of the present invention is to provide a highly reliable auxiliary measurement and control device that is free from operator errors.

[Means for Solving the Problems] In order to achieve the above problems, the present invention takes the following measures.

The first means includes a main chuck that is rotatably driven to hold a workpiece, a main tool rest in which a large number of tools are placed and which processes the workpiece of the main chuck by moving relative to the main chuck, and a main tool rest that is movable forward and backward relative to the axis of the main chuck spindle. an auxiliary tool rest equipped with an auxiliary chuck or tool for holding a workpiece, a main measuring device for measuring a tool cutting edge of the main tool rest, and a claw reference surface of the auxiliary chuck or an auxiliary tool rest provided on the main tool rest. This is an NC turning machine tool with an auxiliary measuring device that measures the position of the tool cutting edge.

In the first means, it is even better to provide an NC turning machine tool with an auxiliary measuring device, characterized in that the main measuring device is provided in the main body of the machine tool, and the auxiliary measuring device is provided in the main tool rest.

The second means is a first storage means for storing the measured value of the tool cutting edge position of the auxiliary tool rest as a coordinate position, where the auxiliary chuck jaw reference plane l'S measured by the auxiliary measuring device is the first means. and a second storage means for storing processing origin coordinates and machine origin coordinates of the workpiece and the auxiliary tool post,
a third storage means for storing a tool offset value from the tool mounting reference surface of the auxiliary tool post to the tool cutting edge position or a jaw offset value from the auxiliary chuck end surface to the auxiliary chuck jaw reference surface; This is a coordinate axis calculation device for an NC turning machine tool with an auxiliary measuring device, which has calculation means for calculating the tool offset value or the claw offset value from the measured value, the machine origin coordinates, and the machining origin coordinates.

[Function] According to the NC turning machine tool with an auxiliary measuring device and its coordinate axis calculation device according to the present invention, the jaw reference surface of the auxiliary chuck or the tool of the auxiliary tool rest, which moves forward and backward on the Z-axis in opposition to the main chuck. The blade edge position is measured using a W-axis auxiliary measuring device parallel to the Z-axis. By calculating the measurement value measured by the main measurement device and the W-axis measurement value by the auxiliary measurement device, it is possible to obtain the correction value for each coordinate axis.

[Example] Next, an example of the coordinate axis calculation device for an NC turning machine tool according to the present invention will be described with reference to the drawings. FIGS. 1(a) and 1(b) show explanatory diagrams of setting the shift amount of the workpiece coordinate system. FIG. 3 is an explanatory diagram showing a relative positional relationship between coordinate positions of the Z axis and the W axis. Processing origin 1 in Figure 1 is the origin on the program of X and Z system coordinates, and is the origin of the program for workpiece 3.
The second machining origin is shown. The machine origin 2 indicates the W-axis (axis parallel to the Z-axis) origin on the machine tool, and here the auxiliary tool rest 5
It is the origin of Work 3 is a work held by the main chuck.

A tool 4 (a drill in the illustrated example) is rotatably attached to an auxiliary tool rest (hereinafter referred to as a sub-turret) 5. That is, in FIG. 1(a), the workpiece coordinate system is shifted ff1Lf in a state in which the tip of the drill 4, which has its rotation center on the same axis as the main chuck, is in contact with the end of the workpiece by the forward movement of the sub-turret 5. ]If you ask for L,
Pay for the workpiece! t, and the offset amount HB of drill 4 is
If L and machine coordinates are M old, the front end surfaces of sub-turrets 1 to 5 are the W-axis program origin, so LBL=)IBI, +, ft-M[IT...
・・・・・・ The relationship (1) is established. Kudashi, MBt
is the value in the W-axis display) In addition, in FIG. 1(b), when the auxiliary chuck (hereinafter referred to as sub-spindle) 6 whose rotation center is on the same axis as the main chuck advances toward the main chuck, The reference surface 8 of the claw 7 of the sub-spindle 6 is brought into contact with the end surface of the workpiece 3 held by the main chuck. In this state, the workpiece coordinate system shift amount LBj is equal to the machining allowance of workpiece 3! j, and the offset amount of the claw reference plane is HBj~ and the machine coordinates are MBj. Since the reference plane 8 of the claw 7 is the W-axis program origin, LBj=HBj+Jej -MBj ・・・(2
> 6 (However, MBj is - on the W axis display)
).

Next, the setting of the coordinate system will be explained based on FIGS. 2(a) and 2(b). This shows the relative coordinate display position between the Z axis and the W axis. Regarding the coordinate system of the sub-turret shown in Fig. 2(a), from the machining origin to the tool cutting edge position, that is, the measurement position PBL by the auxiliary measuring device (not shown) is:
In the W axis, which is the axis on the main shaft axis based on the machine origin 2,
When the work length is w and 2t, P BL= L BL+ M BL-H1lt-Wf
L......(3). Regarding the coordinate system of the sub-spindle shown in FIG. 2(b), the measurement position PIlj from the machining origin to the claw reference plane by the auxiliary measuring device is P Bj = L Bj + M Bj - HJ - W l
j・・・・・・〈4).

Next, the distance from the machining origin 1 to the cutting edge position of the tool 9 on the Z axis on the main tool post shown in FIG. 3 is 1Pzt.

1, the coordinate from the machining origin 1 to the machine origin 10 on the Z-axis is Lzz, the coordinate on the Z-axis from the machine origin 10 to the mounting reference plane of the main tool post is Mz+5, and the offset amount to the tool cutting edge is HzL. And the length of workpiece 3 is W 1 L l
Then, Pz Ll = Lzz-1-Mzt Hzt-
Wi! In this case, the distance Pzt2 from the cutting edge position of the tool 9 on the Z-axis to the end of the workpiece 3' on the sub-spindle is the distance Pzt2 from the machine origin 2 on the W-axis to the end of the auxiliary chuck 7. coordinates in MB
t, the offset amount of the jaw is HBj, and the length of the workpiece is WZt.
2, PZL2 = LBj + MBt - HBt
-Wl 2-Lzz-Mzt, +HzL
- It can be determined by (6). (However, MZL
, MBL is a value of -. ) Furthermore, an example of measurement of each offset amount by the auxiliary measuring device of the W axis on the main tool rest will be explained based on FIGS. 4 and 5. The W-axis auxiliary measurement device is mounted on the main tool rest for measurement. That is, the auxiliary measuring device 12 shown in FIG.
Accordingly, the position of the cutting edge of the tool 4 on the sub-turret 1-5 is measured. Tool Offseller 1~Amount) IBt is the distance from the end of the measuring device 12 to the machine origin 10 on the Z axis, and L is the distance between the origins from the machine origin 10 to the machine origin 2 on the W axis.
t,, the sensor length is i! Assuming L, )(1] L=LL-M L-fL+MBL...
(7), and the coordinate value of the tool cutting edge based on the machine origin 2 reference on the W axis can be obtained. Furthermore, the pawl offset amount HBj measured by the pawl reference plane 8 of the sub-spindle 6 with the auxiliary measuring device shown in FIG. The distance between the origins from to the mechanical origin 2 on the B axis is Lj, and the sensor length is i! j, HBj=Lj −MZj−1
:r +MBj (8). (However, M Zj and M Bj are negative values.) Next, we will explain the measurement procedure by the auxiliary measuring device using the flowchart shown in Fig. 6. In other words, when the main tool post is After swinging down the sensor of the attached auxiliary measuring device, turn on the W-axis measurement mode, select blade edge measurement or claw measurement by poking, and in the case of blade edge measurement, move the auxiliary measuring device on the main tool post to the X and Z axes. Control the movement of sub-turret I~ on the W-axis to bring the sensor closer to the tool tip of the sub-turret.In addition, in the case of a claw meter, move the auxiliary measuring device of the main tool rest to
, the Z-axis and the W-axis of the sub-spindle are controlled to move the sensor closer to the claw reference surface or the workpiece end surface.

Thereafter, by moving the W or Z axis, the sensor is pressed against its respective measuring end to send out a touch signal, and the operator stage 30 measures the amount of tool offset 1 ~ of the sub turret 1 ~ and the pawl offset of the sub spindle, respectively, on the W axis. 1 to the amount is determined from the above equations (7) and (8). Furthermore, these calculation results are respectively taken in and stored as correction values, and the measurement process is completed.

Aim 11] Next, the measurement control block diagram shown in FIG. 7 will be explained. The mechanical origin positions of the W-axis and Z-axis are stored in the W-axis mechanical origin memory 23 and the Zmi machine origin memory 24 by the human-powered device 22 via the pass line 21 of the central processing unit 20 . Next, the machine program memory 25 stores movement programs for the main tool post and sub-turret for machining. Work coordinate system shift 1 to quantity memory 27 are as follows:
The workpiece coordinate system shift amount calculated from the machine coordinate memory 26 and machining allowance when the sub-turret or the sub-spindle is advanced and the claw reference plane or tool tip is brought into contact with the workpiece, respectively, is stored.

Next, the main measuring device 28 is a measuring device that measures the X and Z axis directions. Two tool and jaw offset memories are
The claw reference plane and the tool cutting edge are measured, these are used as measurement reference values, and the offset amounts are stored. The auxiliary measuring device 12 is a measuring device in the W-axis direction that is mounted on the main tool rest. The calculation means 30 is a calculation means that measures each coordinate position with respect to the W-axis mechanical origin and calculates the reference values stored in the storage device from each of the above formulas.

[Other Examples] Furthermore, another example of the auxiliary measuring device shown in FIG. 8 will be described. That is, in this embodiment, a sensor 34 for W-axis side measurement is located at the tip of a measurement arm 33 that is swingably provided on the side surface of a main tool rest 32 (turret tool rest), and a sensor 34 is mounted on the opposite side (main chuck side). A sensor 35 is provided toward the camera. This makes it possible to measure the position of the jaw reference plane or workpiece end face, and also to set the workpiece coordinate system by moving the axis using the sub-spindle or sub-turret without directly contacting the jaw reference plane or tool tip position with the workpiece. .

[Effects of the Invention] As is clear from the embodiments described above, according to the present invention,
Since an auxiliary measuring device was provided, the position of the claw reference plane or tool cutting edge could be accurately and quickly measured along the W axis. In addition, the Z-axis and W-axis can be mutually calculated by simply calculating the correction value for the reference measurement value measured by the main measurement device, and appropriate correction can be achieved. Therefore, there are no operational errors by the operator, which improves operational efficiency and has the advantage of doubling the reliability of the measuring device.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) show explanatory diagrams of workpiece coordinate system shift amount setting, and FIG. 1(a) is an explanatory diagram of the coordinate system shift amount when the tool cutting edge is brought into contact with the workpiece end. Figure 1 (b) is an explanatory diagram of the coordinate system shift amount when the claw reference plane is brought into contact with the workpiece end, and Figure 2 (a) is an illustration of the coordinate system setting when the tool tip is set at the measurement position. Explanatory diagram, Figure 2 (b) is an explanatory diagram of the coordinate system setting when the claw reference plane is set at the measurement position, Figure 3
The figure is an explanatory diagram of the relationship between the tool cutting edge position of the main tool post and the auxiliary chuck reference plane, Figure 4 is an explanatory diagram of the measurement of the tool cutting edge position of the auxiliary tool post using the auxiliary measuring device, and Figure 5 is the auxiliary chuck using the auxiliary measuring device. FIG. 6 is a measurement flowchart 1, FIG. 7 is a measurement control block diagram, and FIG. 8 is a sectional view of main parts of an auxiliary measuring device showing another embodiment. 1... Processing origin (main chuck side), 2... Machine origin (
W axis), 3.3'... Workpiece, 4... Tool (drill), 5... Auxiliary tool post (sub turret), 6... Auxiliary chuck (sub spindle), 7... Jaw, 8...・Claw reference plane, 9...Tool, 10...Machine origin (Z axis>, 11...
...Machining origin (auxiliary chuck side), 12...Auxiliary measuring device, 20...Central processing unit, 21...Pass line, 22...Input device, 23...W-axis machine origin memo, J,
24... ZIII machine origin memory, 25... Kanji program memory, 26... machine coordinate memory, 27...
...Work coordinate system shift i-quantity memory, 28...Main measuring device, 30...Calculating means Fig. 1 (G)

Claims (1)

[Scope of Claims] 1. A main chuck that is rotationally driven and holds a workpiece, a main tool rest that arranges a number of tools and processes the workpiece of the main chuck by moving relative to the main chuck, and a main chuck that moves forward and backward with respect to the main chuck spindle axis. an auxiliary tool rest provided with an auxiliary chuck or a tool that is capable of holding a work; a main measuring device that measures a tool cutting edge of the main tool rest; and a jaw reference surface of the auxiliary chuck or An NC turning machine tool with an auxiliary measuring device that measures the position of a tool cutting edge of an auxiliary tool rest. 2. The NC turning machine tool with an auxiliary measuring device according to item 1, wherein the main measuring device is provided in the main body of the machine tool, and the auxiliary measuring device is provided in the main tool rest. 3. In the description of item 1, a first storage means for storing a measured value of the jaw reference plane of the auxiliary chuck or the tool cutting edge position of the auxiliary tool post measured by the auxiliary measuring device as a coordinate position; a second storage means for storing machining origin coordinates and machine origin coordinates on the auxiliary tool post; and a tool offset value from the tool mounting reference plane of the auxiliary tool post to the tool cutting edge position or from the auxiliary chuck end face to the auxiliary chuck jaw reference plane. a third storage means for storing the pawl offset value up to and a calculation means for calculating the tool offset value or the pawl offset value from the measurement value measured by the auxiliary measuring device, the machine origin coordinates and the machining origin coordinates; Coordinate axis calculation device for NC turning machine tool with auxiliary measuring device.