JPS6254653A - Phase alignment method - Google Patents

Abstract

PURPOSE:To enable easy and proper phase alignment in an NC combined lathe by measuring the phase angles of a workpiece and a chuck through a touch sensor fixed to a spindle and correcting a processing program. CONSTITUTION:The pawl 10 of a chuck 9 holds a workpiece 11 at a given phase angle. Then, a touch sensor 15 as indexed to a predetermined position through the turn of a tool rest 13 advances toward a workpiece 11. Thereafter, a spindle 6 turns counterclockwise through control by an NC control device and a touch sensor 16 comes in contact with the phase base part 11a of the workpiece 11. Then, a turning angle or an out-of-phase extent theta3 is read by a pulse encoder and the electric signal thereof is transmitted to the NC control device, while the spindle 6a stopping concurrently. And the NC control device uses the operation ability thereof and carries out the coordinate conversion of NC processing data from the measured out-of-extent theta3, thereby correcting the out-of-phase extent of the workpiece 11 and enabling the processing work.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for phasing a workpiece in an NC compound lathe capable of performing compound machining.

[Technical background of the invention and its problems] FIGS. 5 and 6 show the workpiece 1 after processing, and the NC
Turning and drilling were performed using a compound lathe. By the way, as shown in the figure, a lip, that is, a phase reference part 1a, which serves as a reference in the rotational direction is formed on the workpiece 1, and holes 1b are equally spaced at positions where the phase is θ with respect to this phase reference part 1a. ing. Therefore, when machining this workpiece 1 with an NC compound lathe, it is necessary to process the workpiece 1 using the phase reference part 1a as a reference.
It is necessary to grasp it with a chuck.

Therefore, as shown in FIG. 6, the most common method is to provide a bin 3 for phase alignment on the end face of the chuck 2, grasp the workpiece 1 by an operator or a MH device such as a robot, and adjust the position of the chuck 2. Workpiece 1 while pressing against the end surface
The rib of the workpiece 1, that is, the phase reference portion 1a
When the chuck 2 comes into contact with the bottle 3 on the end face of the chuck 2, the jaws 4 of the chuck 2 are moved to grip the workpiece 1 with the phases of the workpiece 1 and chuck 2 aligned, and then processing begins. This was the normal mass production method.

By the way, the phase relationship between this phase reference part and the hole that requires indexing differs depending on the workpiece, and the phase reference part also has a protruding shape and a concave shape, so it is necessary to install the bin according to the phase relationship. It was necessary to prepare the type of bottle depending on the part to be attached to the chuck and the shape of the phase reference part. For this reason, setup adjustment work is required to change the position of the bottle on the chuck and replace the bottle every time the workpiece is changed, which increases tooling costs and requires a large number of man-hours for setup adjustment work. There were problems such as.

[Object of the Invention] In order to solve this problem, the present invention provides a phase matching method that allows easy and accurate phase matching in an NC compound lathe even if the workpiece changes, without using a positioning pin. The purpose is to provide

[Summary of the invention] The present invention relates to a workpiece having a phase reference part in the rotational direction, such as a rib or a protrusion, and an N process for turning or drilling the workpiece.
In a C machine tool, a chuck that is fixed to the main shaft that can be aligned in the rotational direction of the main shaft of the machine tool, that is, can be indexed, and that grips the workpiece, and a touch sensor installed inside the NG machine tool that can detect the position, are used. The feature is that the phase angle between the workpiece and the chuck is measured and the machining program is modified by this phase angle to easily and accurately perform phase alignment.

[Embodiments of the Invention] FIGS. 1 to 4 show the phase matching method of the present invention, and the same parts as in FIGS. 5 and 6 are designated by the same reference numerals, and the explanation thereof will be omitted. On the bed 5 of the NC compound lathe, there is a headstock 6,
A saddle 7 and a tailstock 8 are placed, and the main spindle 6 is mounted on the headstock 6.
A chuck 9 is attached via the chuck 9, and the chuck 9 grips the workpiece 11 with the claws 10 and is rotatable about the main shaft 6a. Further, the main shaft 6a has a mechanism that allows free control not only of its rotational speed but also of its stopping position. The saddle 7 can slide on the bed 5 in the left-right direction, and a gun head 12 is provided on the saddle 7, and can slide on the saddle 7 in a direction perpendicular to the sliding direction of the saddle 7.

A turret turret 13 is attached to the gun head 12,
A cutting tool 14 for turning and a rotary tool 14a for drilling are attached to the turret tool rest 13. Usually, the structure is such that about 6 to 12 such tools can be mounted evenly.

In the phase alignment method of the present invention, an internal measurement device, that is, a touch sensor 15 is attached to the turret tool rest 13. This turret tool post 13 can be rotated around a rotation axis 13a in order to index the cutting tool 14 or touch sensor 15 to a processing (measurement) position.

FIG. 3 shows the structure of the touch sensor 15, and the head 16
is pulled by a spring 17, and the plate surface 16a of the head 16 is in contact with three electrodes 18, respectively. head 1
When a force as indicated by the arrow 19 is applied to the plate surface 16a, which is pulled by the spring 17, at least one of the three electrodes 18 is tilted due to this external force, and at the moment of separation, the plate surface 16a is pulled by the spring 17. It is designed to emit an electrical signal.

Next, the operation of this embodiment will be explained. In FIG. 1, first, the main shaft 6a is indexed to a fixed position, and the chuck 9 integrated therewith is stopped at the fixed position.

A pulse generator and a pulse encoder (not shown) are attached to the end of the main shaft 6a, and the pulses are used to position the main shaft 6a in the phase direction. This position control is performed by NC control, and as shown in FIG. 2, the phase state of the main shaft 6a, that is, the reference position O-0' of the chuck 9, is set to a phase angle=0°.

In this state, next open the claws 10 of the chuck 9 in the outer circumferential direction,
The workpiece 11 is loaded by a loading device such as a robot, and the workpiece 11 is attached to the chuck 9 at an arbitrary phase angle or in a roughly positioned state.

That is, the angle between the center line of the phase reference portion 11a of the sea urchin workpiece 11 and the reference position O-0- of the chuck 9 is 03 as shown in FIG. Next, in FIG. 1, the touch sensor 15 is indexed to a fixed position by the rotation of the tool rest 13, the touch sensor 15 moves forward toward the workpiece 11, and the touch sensor head 16 is moved as shown in FIG. is positioned in place. Thereafter, the main shaft 6a is controlled by the NC control device to slowly rotate counterclockwise as shown in FIG. 2, and continues to rotate until the touch sensor head 16 comes into contact with the phase reference portion 11a of the workpiece 11. Naturally, during this time, the rotation angle of the main shaft 6a is checked by a pulse encoder (not shown). At the moment when the touch sensor head 16 and the phase reference part 11a of the workpiece 11 come into contact, an electric signal output from the touch sensor 15 is input to the NC control device, which immediately stops the rotation and moves the main shaft 6a from the reference position. The number of turns is read by the NC control device. The value of this reading is shown in FIG. 4 as θ1.

Therefore, as shown in FIG. 4, the phase shift mθ3 between the workpiece 11 and the chuck 9 can be determined using the arithmetic function in the NO control device as follows.

(Left below) sin θ2-2 = 2r 2r θ2 = sin-1t r where r is the distance from the center of rotation of the main axis of the touch sensor head 16, t is the thickness of the phase reference portion 11a of the workpiece 11, Since these are predetermined numerical values, θ3 can be easily calculated by inputting them as dawn type data in the NG program.

When the above phase alignment measurement operation is completed, the touch sensor 15 retreats to its original position and returns to the state before measurement.

Next, processing of the workpiece 11 begins, but since the phase of the chuck A7 and the workpiece 11 is out of phase by θ3, the following correction is made. That is, in FIG. 4, when the NC machining data is a polar coordinate system centered on the spindle center 0, the coordinate system is converted as follows. 0-0' is N
This is the reference position of the C-axis (phase position) of the G compound lathe, and since the angle from the phase reference line o-o'' of the workpiece 11 at the drilling position 1b is determined in advance to be θ, the reference position of the C-axis The angle from the line 0-0- is θ4-θ+63, and by adding θ3, the coordinate system of the NC machining data can be changed.

Further, when the NC machining data is given as X and Y coordinate values in a rectangular coordinate system, that is, a coordinate system in which the center is O and the y axis is 0-0, the coordinate transformation is as follows.

First, the position data from the phase reference part 11a, that is, the coordinates of the drilling position 1b in an orthogonal coordinate system with O as the coordinate center and O-O" as the y axis, is the distance from the rotation center 0 to the drilling position 1b. If shifted, it is given by X=R3i nθ Y=Rcosθ.With O as the coordinate center, o−o
When converted to an orthogonal coordinate system with the axis as
It can be easily calculated in the NC device by i n0 cos θ3 −R5 i n θ sin θ3.

As described above, even if a phase shift occurs while the workpiece 11 is being loaded, the NC
Measure the phase shift between the chuck 9 and the workpiece 11 in the machine S1 on the compound lathe, and use this data to calculate the
The coordinates of the NC machining data are transformed using the function f3 in lli, so that the workpiece 11 can be machined while correcting its misalignment.

According to the phase alignment method of the present invention, there is no need for a pin to mechanically contact the rib or protrusion of the workpiece 11, and there is also no need to create a special mounting hole on the chuck side for mounting this bottle. This eliminates the need for any mechanical positioning device. In addition, since phase alignment can be performed using software, that is, a machining program, it is highly flexible, and even if there are variations in the material of the workpiece, it can be handled by simply entering correction values in the machining program. The benefits are significant in terms of price, flexibility, and automation.

Although an embodiment using an NC compound lathe has been described above, the method of the present invention can also be applied to a turning machine other than an NC compound lathe, for example, an NC turning center machine (NG compound vertical lathe).

[Effects of the Invention] According to the phase alignment method of the present invention, a mechanical positioning device such as a bottle is not required, and phase alignment can be performed easily and accurately even if the workpiece changes.

In addition, when changing the model, it is only necessary to replace the machining program, so if this is done using the NC control device, there are excellent effects such as automatic setup being possible without any operator intervention.

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment of the phase alignment method of the present invention, in which Figure 1 is a dimensional front view of an NC compound lathe, and Figure 2 is a chuck seen from the turret tool post side. 3 is a sectional view of the touch sensor applied to the present invention, and FIG. 4 is a front view of the coordinate transformation shown in FIG. 5. 1.11... Workpiece, 1a, 11a... Phase reference part, 2.9... Chuck, 4, 10... Jaw, 6...
Headstock, 7...Saddle, 13...Turret turret, 15...Touch sensor 16...Head. Agent Patent Attorney Nori Chika Yudo Hiroshi Mimata Collection 1I! ! θ′th; #j Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] In a numerically controlled machine tool, in which a workpiece having a phase reference part is gripped by a chuck attached to the main spindle and sequentially machined by a numerical control device, the workpiece is stopped at a fixed position by a touch sensor attached to the machine tool. A first step of measuring the phase angle between the chuck and the phase reference portion of the workpiece, and a second step of correcting the machining program of the numerical control device with respect to the measured phase angle. Phase matching method.