JPH0354834Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a numerically controllable processing device installed in the station of a transfer machine, for example, which can be used with high precision between a spindle tool and a workpiece. The present invention relates to position detection means for enabling relative positioning.

[Summary of the idea]

In the processing device of the present invention, in order to perform three-dimensional position detection with high precision using one contact, a first magnetoelectric transducer is placed on the middle side of the contact, and second and third magnetoelectric transducers are placed on the tip of the first magnetoelectric transducer. magnetoelectric conversion elements are provided respectively. Opposed to the first magnetoelectric transducer, the spindle holder has a first magnet having a magnetic pole boundary in the XY plane.
A second magnet is arranged on the support member of the workpiece.
A second magnet having magnetic pole boundaries in the YZ plane and the ZX plane is disposed opposite to the third magnetoelectric conversion element, and the first magnetoelectric conversion element controls the original direction in the Z direction during machining and feeding. The position is detected, and the position in the X and Y directions is also detected by the second and third magnetoelectric conversion elements.

[Conventional technology]

In transfer machines, the workpieces are supported in position on jigs or pallets and are fixed in position by them at each station. Then, at each station, necessary cutting is performed by a processing unit.

Recently, this type of machining unit has come to be equipped with a numerical control device, which automatically determines the position of the tool relative to the workpiece and determines the necessary feed amount (machining depth) at that position. The cutting process is applied to the parts.

By the way, during machining, the feed screw, spindle, column, base, etc. on the machining unit side are thermally deformed, and there are also variations in the dimensions of the jig itself on the transfer machine side, variations in the positioning of the workpiece relative to the jig, and even parts. A relative positioning error occurs between the workpiece and the processing unit due to cumulative errors in mutual processing accuracy.

Therefore, even if the processing unit controls the positioning and feed amount with high accuracy according to a preset numerical control program, the processing of the workpiece may be affected due to the thermal deformation and dimensional variations of each part as described above. An error will appear.

[Problem that the invention attempts to solve]

Therefore, the applicant for utility model registration filed the utility model application in 1983.
With the invention of No. 99669, the relative position between the workpiece and the tool on the spindle is determined by a sensor on the spindle at a certain distance from the workpiece, and then the relative position is determined by numerical control. We have already proposed a technology to regulate the machining depth.

Although high-precision machining has been achieved with the above invention, when setting the position of the spindle in the feed direction, that is, when the sensor detects the reference position, a means to determine the rotational position of the spindle is required, and a temporary Loss time occurred because the feed stopped, and problems with machining efficiency remained.

Therefore, in the invention of Utility Application No. 60-61111, the applicant further proposed that in the process of feeding the spindle,
We have proposed a processing device that does not require a setting function and can determine the reference position from the feed motion and perform the subsequent cutting motion continuously and efficiently.

However, this device has the problem that the position in one direction (Z direction) cannot be detected and corrected, and the installation position of the position detection magnet is limited.

The purpose of the present invention is to improve the problems of the prior art, and to make it possible to perform three-dimensional position detection with high accuracy using a single contactor, and to detect and correct the original position in the Z direction during processing feed. The object of the present invention is to provide a high-precision machining device in which the detection time is shortened to zero.

[Means for solving the problem] In order to achieve the above purpose, the present invention
The processing unit is provided in a processing unit that can be numerically controlled in the three-dimensional axial directions of the axis and the Z-axis, and includes a contact that is advanced and retreated by an advancing and retracting means, and a reference surface that determines the position of the contact when the contact advances. The support member for the workpiece and the contactor are provided on the Z-axis and X-axis, respectively.
1st, 2nd, and 3rd for position detection in the axis and Y-axis directions
a first magnet fixed to the spindle side of the processing unit and having a magnetic pole boundary in the XY plane;
a second magnet having a magnetic pole boundary in the YZ plane of the second magnet, and a second magnet having a magnetic pole boundary in the YZ plane of the second magnet when the contact is positioned by the reference plane. With the conversion elements facing each other,
The third magnetoelectric transducer is placed to face the boundary of the magnetic poles of the second magnet in the ZX plane, and the first magnetoelectric transducer is placed at a position facing the movement range of the first magnet in the machining operation. are placed.

[Effect]

In the processing device configured as described above, when the tip of the contact comes into contact with the reference surface of the support member while the spindle has returned to the return position, the second and third magnetoelectric transducers are connected to the second magnet. Position detection in the X and Y directions is performed in close opposition to the magnetic pole pattern. In parallel with this, the processing unit including the spindle is advanced. At this time, if the position in the X and Y directions is shifted as a result of the above detection, the numerical control device Upon receiving the output signal, the numerical control program is corrected by the amount of deviation, and the servo motors for the X and Y axes are driven and controlled.

When the first magnet faces the first magneto-electric transducer while the processing unit is advancing, the element detects the magnetic pole boundary of the magnet, and the numerical control device receives the output signal from the first magneto-electric transducer. Then, the program is started and the spindle is fed for cutting.

〔Example〕

The present invention will be described below with reference to an embodiment shown in the drawings. FIGS. 1 and 2 show the main parts of an embodiment of a high-precision processing apparatus 1 according to the present invention. This high-precision machining device 1 uses a numerical control device 2 to control X, Y,
Processing unit 3 controlled in the three-dimensional axis direction of Z
It is equipped with This processing unit 3 includes a contactor 5 in the Z-axis direction that is moved forward and backward by a cylinder 4, and second and third magnetoelectric conversion elements 6, 7 ( e.g. magnetic analog sensor), and also has a contact 5
A first magnetoelectric transducer 8 as a Z-direction sensor is provided at the middle side.

The spindle 9 in the Z direction is the spindle holder 1
A bar-shaped magnet 12 (first magnet) is fixed at one location of an annular bearing holder 11 fixed to a spindle holder 10, and this magnet is It is provided so that the boundary of the magnetic pole is located at the boundary of the magnetic pole. That is, N and S magnetic poles are arranged in the axial direction of the spindle.

On the other hand, the workpiece 13 is transferred to the transfer device 14
They are sequentially guided along with supporting members 15 such as pallets to the front side of the processing unit 3, that is, to the processing station. In this embodiment, the support member 1
A workpiece 13 is supported on the side surface of the spindle 9, and a cutter 16 attached to the tip of the spindle 9 performs a predetermined process.

Further, on the upper surface of the support member 15, there is a reference surface 17 on which the tip of the contactor 5 is placed, and an X, Y magnet 18 (second magnet) disposed facing the X, Y direction sensor. It is provided so that the boundaries of the magnetic poles are in a plane.

For example, as shown in FIG. 3, the X, Y magnet 18 has a magnet pattern in which the boundaries between the N and S poles are horizontal and vertical, and the reference plane 1 is located in the center of the magnet pattern.
7 is placed and the support member is correctly set at the reference position in the X and Y directions,
The X and Y direction sensors 6 and 7 are arranged to face the boundary between the N and S poles in the Y direction, and the machining program of the numerical control device 2 incorporates the boundary between the N and S poles as the origin. be.

In the high-precision machining device 1 configured as described above, the machining operation of the machining unit 3 is controlled by the numerical control device 2.
It is executed according to the NC machining program. First, with the spindle 9 returning to the return position, the cylinder 4 is operated and the contact 5 is advanced so that its tip abuts against the reference surface 17. As a result, the X and Y direction sensors 6,
7 will be closely opposed to the boundary between the N and S poles of the X and Y magnets 18, but if it deviates slightly from the boundary due to various displacements and cumulative errors, the sensor will detect the amount of deviation from the boundary. An analog output corresponding to the value is generated and sent to the numerical control device 2. Specifically, the analog output corresponding to the amount of deviation is sent to a digitally converted numerical control device, and since the relationship between the amount of deviation and the digital value is stored in advance in the numerical control device, the program is automatically corrected by the amount of deviation. .

In parallel with this, processing unit 3 spindle 9
While rotating, the cutting tool 16 moves forward by a feeding motion to bring the cutting tool 16 closer to the workpiece 13.

In this forward movement process, that is, in the moving range during the machining operation, the Z direction sensor 8, which is stopped when the contact 5 comes into contact with the reference surface 17, comes to face the first magnet 12 and detects its magnetic pole boundary. , sends the detection signal to the numerical control device 2.

The numerical control device 2 corrects the program by the amount of deviation in the X and Y directions, and
The servo motor of the axis is driven and controlled, and the Z
In response to the detection signal from the direction sensor, the program is started (as the origin of the predetermined machining), and the machining unit 3 is advanced by a predetermined feed amount, thereby causing the cutter 16 to move the workpiece 13 in a predetermined direction. Perform depth cutting.

Note that as a detection method in the Z direction, the method disclosed in Utility Model Application No. 60-61111, which uses an annular magnet, may be adopted.

Furthermore, as a detection method in the X and Y directions, there is not only a method of detecting the amount of deviation from the detected values in the X and Y directions as in the above embodiment, but also a method in which the X and Y direction sensors are completely opposed to the boundary of the second magnet. The servo motors for the X and Y axes are driven so that the
It is also possible to adopt a method of correcting the position.

[Effect of idea]

As is clear from the above explanation, according to the present invention, the jig position can be detected and corrected in three dimensions, making it possible to handle all kinds of machining with high precision.Furthermore, it is constructed using only one contactor. is easy. In addition, the detection time (loss time in machining) is very short, which not only allows efficient machining, but also has significant practical effects, such as eliminating the need for means for determining the rotation angle of the spindle.
The present invention is equally effective when used not only in transfer machines but also in general numerically controlled processing equipment.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an outline of an embodiment of the present invention, Fig. 2 is an enlarged view of its main parts, and Fig. 3 is a diagram illustrating the magnet pattern of the X and Y magnets in the above embodiment. be. 1... High precision processing equipment, 2... Numerical control device,
3... Processing unit, 4... Cylinder, 5...
Contactor, 6, 7, 8... Magnetoelectric conversion element, 9... Spindle, 10... Spindle holder, 12...
...first magnet, 13...workpiece, 15...support member, 16...cutting tool. 17...Reference surface, 18...
...Second magnet.

Claims (1)

[Claims for Utility Model Registration] A contactor that is provided in a processing unit that can be numerically controlled in the three-dimensional axial directions of the X-axis, Y-axis, and Z-axis, and that is moved forward and backward by an advancing and retracting means, and the advancement of the contactor. a support member for the workpiece having a reference surface for determining the position of the contact; and a support member provided on the contact, each having a Z
first, second, and third magnetoelectric transducers that detect positions in the axial, X-axis, and Y-axis directions, and a first magnet fixed to the spindle side of the processing unit and having a magnetic pole boundary in the and a second magnet that is provided on the support member and has magnetic pole boundaries within the YZ plane and the ZX plane, and when the contactor is positioned according to the reference plane, the second magnet is located within the YZ plane. The second magnetoelectric conversion element is opposed to the boundaries of the magnetic poles of the second magnet, and the third magnetoelectric conversion element is opposed to the boundaries of the magnetic poles in the ZX plane of the second magnet, and the processing operation of the first magnet is performed. A high-precision machining device, characterized in that the first magnetoelectric transducer is disposed at a position facing the movement range.