JPH0647631Y2 - High precision processing equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a high-precision machining apparatus, and in particular, an apparatus such as a transfer machine, which is difficult to perform high-precision machining, is equipped with a measuring function and an automatic adjusting function. Regarding improvements to enable desired high-precision machining.

[Outline of the Invention] In the present invention, for example, a workpiece is laterally moved by a transfer device or a supporting member thereof is formed with a reference surface, and two probe heads moving toward and away from the supporting member are parallel to both sides of a spindle. As shown in the figure, each measuring element is provided with a magnetoelectric conversion element facing the spindle, and an annular magnet with magnetic poles arranged in the axial direction is attached to the spindle on the side of the forward / backward movement range of the magnetoelectric conversion element. Prior to the start, each probe is moved so as to contact the reference surface, and at that time, the support member is displaced in the contact direction with the probe in response to the magnetoelectric conversion element detecting the magnetic pole boundary of the annular magnet. This is a high-precision processing apparatus configured to obtain parallelism of the workpiece with respect to the transfer direction and perpendicularity with respect to the cutting tool.

[Prior Art] In a transfer machine, a workpiece is supported by a jig on a pallet, and each pallet is transported to a fixed position at each station, where the pallet is positioned and clamped to perform the required cutting on the workpiece. It is designed to perform work such as processing.

Therefore, if the positioning accuracy is not good, the processing accuracy will also be poor. For this reason, however, conventionally, for example, a carbic coupling, a V-shaped wedge, and a taper shape that utilize the meshing (superposition) of opposing annular teeth. The position of the pallet was regulated in three dimensions by locating pins.

[Problems to be solved by the invention] However, according to such a conventional position regulating means, if dust, chips, etc. during processing are mixed in the positioning portion, the accuracy deteriorates,
It also lacks stability. Further, it is technically difficult to perform highly accurate positioning, and the accuracy is deteriorated due to temperature change.

Therefore, an object of the present invention is to provide means for easily enabling high-precision machining even in a device such as a transfer machine where high-precision machining is difficult as it is.

[Means for Solving the Problems] In order to achieve such an object, the present invention provides a processing unit that rotatably supports a spindle, and the processing unit on both sides of the spindle so as to be parallel to the spindle. Attached to at least two measuring elements provided, advancing and retracting means of each measuring element, a magnetoelectric conversion element provided on each of the measuring elements so as to face the spindle, and a spindle on the side of the advancing and retracting movement range of the magnetoelectric conversion element. A magnet whose magnetic poles are aligned in the axial direction, a reference surface with which each of the measuring elements formed on the workpiece facing the processing unit or its supporting member abuts, and a direction in which the supporting member abuts the measuring element. The gist is that it is provided with a means for displacing.

[Operation] In the above-described high-precision machining device of the present invention, each probe is moved so as to contact the reference surface before the machining is started, and the magnetoelectric conversion element moves the magnetic pole boundary of the magnet attached to the spindle at that time. In response to the output generated by the detection, the support member is displaced in the contact direction with the probe, so that parallelism (perpendicularity to the cutting tool) of the workpiece is obtained.

Therefore, in the transfer machine, the pallet on which the workpiece is placed is properly positioned, and even if the parallelism and other precision is not obtained at that time, the processing unit detects the error and the pallet is positioned and clamped. Since the index position of the table is controlled and corrected in a closed loop with respect to the workpiece or the jig, high precision machining can be easily realized.

[Embodiment of the Invention] The invention will be described below with reference to the embodiments shown in the drawings.
FIGS. 1 (a) and 1 (b) show an embodiment of a high-precision machining apparatus to which the present invention is applied to a transfer machine, which is controlled by a numerical controller 1 in three axial directions of X, Y and Z. The processing unit 4 has a spindle 7 rotatably mounted on the front surface thereof and is provided with two independent cylinders 2 that face forward (rightward in the figure). It is provided on both sides of the cylinder 7 in parallel with the piston 9 of the cylinder 2. Magnetoelectric conversion elements 8a and 8b, which are sensors in the Z-axis direction, are attached to the middle side of the probe 3. An annular magnet 10 is attached to the spindle 7 in a manner as shown in FIG. 2, for example. Cylinder 2
For this, one having a configuration capable of stopping (locking) the piston 9 is used.

In FIG. 2, immediately before the spindle holder 11 in the spindle 7, there is mounted an annular magnet 10 in which both magnetic poles that are close to each other laterally in the moving range of the magnetoelectric conversion element 8 are arranged in the axial direction. It is magnetically shielded by being surrounded by an annular bearing retainer 12 and a lid 13 which are made of a magnetic material and fixed to the front face thereof with a slight gap.

The upper part of the spindle holder 11, the bearing retainer 12, and the lid 13 are notched in a plane, a part of the annular magnet 10 is exposed from the window hole 15 formed in the center of the notched surface 14, and the notched surface 14 is nonmagnetic. Dust cover 16 protects it from dust. 17 is a cutting tool.

The workpiece 18 is mounted on the jig 20 on the pallet 19 and sequentially guided onto the index table 6 in front of the processing unit 4 by a transfer device (not shown).
The index table 6 is a well-known one capable of performing rotary indexing in a horizontal plane with high resolution, and a normal index is controlled by a semi-closed loop or open loop.

A parallelism reference plane 5 is formed on the jig 20, and the probe 3 is brought into contact with the reference plane prior to the start of processing, as will be described later. A positioning pin 21 is provided on the index table 6 and is used for positioning the pallet 19.

Next, the operation of the high precision processing apparatus having the above-mentioned configuration will be described.

(I) The pallet 19 integrated with the jig 20 is transported by the transfer device at intervals of the stations, and is engaged with the positioning pins 21 to be positioned and clamped on the index table 6.

(Ii) The processing unit 4 is operated while the cylinder 2 is operated.
Is moved forward to bring the probe 3 into contact with the reference surface 5 of the jig 20. During the forward movement of the processing unit 4, the magnetoelectric conversion element 8 detects the magnetic pole boundary of the annular magnet 10 and generates zero output.

(Iii) At this time, the machining unit 4 is moved forward until the magnetoelectric conversion element 8 of either of the cylinders 2 produces a zero output. Here, when the reference plane 5 is inclined with respect to the processing unit 4, one of the magnetoelectric conversion elements 8 outputs first. That is, when the magnetoelectric conversion element 8a outputs first, the index table 6 is rotated counterclockwise, and when the magnetoelectric conversion element 8b outputs first, the index table 6 is rotated clockwise. As a result, the position of the workpiece 18 is controlled so that the output difference between the magnetoelectric transducers 8 becomes zero, and as a result, the reference plane 5 is set parallel to the X direction of the machining unit 4.

As a concrete method of this, when one of the magnetoelectric conversion elements 8 generates a zero output, the processing unit 4 is stopped, the index table 6 is rotated to return 1/2 of the rotation amount of the other,
It should be stopped when the output difference becomes zero.

(Iv) The position of the index table 6 at this time is detected and sent to the numerical control device, and the position is set to the origin of the machining program in the device.

(V) Retract the cylinder 2.

(Vi) Start predetermined processing.

If it is necessary to detect the X and Y directions, the cylinder 2
One is returned and the other is locked leaving the processing unit 4
May be returned by 1 to 2 mm to perform scanning in the X and Y directions. (For example, see Japanese Utility Model Application No. 60-186699.) In addition, in the case of a transfer machine, the accuracy of parallelism is not obtained, and the accuracy of verticality can be obtained mechanically. However, if it is also necessary to measure the verticality (tilt), three cylinders 2a to 2c are provided in parallel with the spindle 7 as shown in FIG. 3, and the magnetoelectric conversion element is provided in each cylinder. At the same time as the mounting, the parallelism and verticality adjusting means such as an index table is provided on the side of the workpiece.

[Effects of the Invention] As is apparent from the above description, according to the present invention, the parallelism of the workpiece in the transfer machine or the like can be obtained by the closed loop control for the jig or the index table. It is possible to realize high-precision machining by simply using the simple measuring means and adjusting means without increasing the accuracy, and the efficiency is greatly improved, which is a great practical effect.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic structure of an embodiment of the present invention. FIG. 1 (a) is a side view, FIG. 1 (b) is a top view, and FIG. 2 is 90 ° in the rotational direction in the above embodiment. FIG. 3 is a partially enlarged cross-sectional view when cut at the position, and FIG. 3 is a view showing a part of another embodiment of the present invention. 8 ... Magnetoelectric conversion element, 2 ... Cylinder, 3 ... Measuring element, 4 ... Processing unit, 5 ... Parallelism reference plane, 6 ... Index table, 7 ... Spindle, 10 ... Annular magnet.

Claims (1)

[Scope of utility model registration request] 1. A processing unit that rotatably supports a spindle, at least two measuring elements arranged on both sides of the spindle in the processing unit so as to be parallel to the spindle, and advance / retreat of each measuring element. Means, a magnetoelectric conversion element provided on each of the measuring elements so as to face the spindle, a magnet having magnetic poles arranged in the axial direction, which is attached to the spindle on the side of the forward / backward movement range of the magnetoelectric conversion element, and the processing unit. And a reference surface formed on a workpiece or a supporting member of the workpiece that abuts against each of the measuring elements, and means for displacing the supporting member in the abutting direction of the measuring element. High precision processing equipment.