SU1113666A1 - Centering device - Google Patents

Abstract

A centering device containing a housing, a spindle placed in it, a generator, a table mounted on a spindle with the ability to move perpendicular to the spindle axis and designed to accommodate a centered part, a table movement actuator executed in the form of four pairs of piezoceramic transducers with ceKTopaj ra electrodes to connect the generator and mounted on the body at the locations of its vibration nodes, the drive of the spindle rotation and the indicator of eccentricity, characterized by the STE, in order to simplify The devices, piezoelectric transducers are made in the form of two ttains in the head of the sector of electrodes on each, located symmetrically relative to the center of rotation and the slab connected to the generator through a switch, and the table is equipped with a fixture.

Description

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The invention relates to a measuring technique and can be used to center parts, such as limbs. A device for centering parts on the stage when measuring them on a circular meter, which contains electric motors, is equipped with centering the measured part, which are connected through a feedback system to the sensor measuring the profile of the part SP. The drawbacks of the device are its complexity and the low sensitivity of the movement of the part due to the large reduction in speed. Closest to the invention is a centering device comprising a housing, a spindle placed therein, a generator, a table mounted on the spindle with the possibility of moving perpendicular to its axis and intended to accommodate a centered part; pairs of piezoceramic transducers with sectors of electrodes for connection to the generator and mounted on the housing at the locations of their vibration nodes, spindle rotation drive and eccentricity indicator The driver of this device has two independent drives with mutually perpendicular coordinates, which complicates the design. In addition, in most cases, after centering, it is necessary to rotate the part to measure, i.e. an additional rotation drive is required. The aim of the invention is to simplify the device by aligning the rotation and centering drives. The goal is achieved by THAT In a centering device comprising a housing, a spindle placed in it, a generator, a table installed on the spindle with the ability to move perpendicular to the spindle axis, the JD data card has a drive for moving the Table, made in the form of chip patterns. with sectors of electrodes for connection to the generator and mounted on the body at the locations of their vibration nodes, the rotational drive and the indicator of eccentricity. The piezoceramic transducers are made in the form of two plates with four sectors of electrodes on each, located symmetrically relative to the center of rotation and connected to the generator through a switch. The table is provided with a lock. FIG. 1 shows a device, a section, in FIG. 2 - the same, top view. The device includes a housing 1, a spindle 2 (aerostatic), a flat spring 3, an axis 4, a piezoelectric transducer — two piezoceramic plates 5, a movable table 6 (in the form of a disk), a centered part 7, a transducer 8 small linear displacements, a rack 9, a sleeve 10 , spring 11, .core 12, electromagnet 13, eccentricity indicator 14 (converter unit 8), electromagnet relay 15, switch 16 and 17, electric oscillation generator 18, anti-friction gasket 19. Device case 1 consists of a cylindrical yoke, tightly closed oh two disk parts. Inside it with a gap (size of 10-20 microns) an aerostatic spindle 2 is installed (the connection of compressed air is not shown). On the spindle there is a movable table 6 in the form of a circular disk having an anti-friction gasket 19. A centered part 7 is fixed on the table. The part 7 is supplied with a transducer tip 8 of linear displacements, which is fixed to the device case 1 through the post 9. On diametrically opposite sides of the table 6, piezoceramic plates 5 are hinged to the table with the help of axes 4. The hinged axes 4 are installed in the node plane of oscillation of piezoceramic plates. Pastes 5 are pressed onto the table 6 by flat springs 3. In the sleeve 10, a core 12 is freely inserted through the spring 11 and interacts with an alternating current electromagnet 13 rigidly fixed to the 1st pin 2. On the piezoceramic converters — plates 5 on one side are applied four sectors of the electrode 18 electrical oscillations connected to the generator. The sectors on each of the plates are diagonally interconnected (Fig. 2). On the reverse side of the plates, piezoceramic transducers are applied a solid electrode connected to a common power wire (not shown). The pairs of sectors of the electrodes are connected to the generator 18 through switches 16 and 17. With the switch 16, a normally closed contact (not shown) is connected to the electrical supply of the relay 15 of the electromagnet 13. The device operates as follows. In the left position of the switch 16 and 17 (Fig. 2), the contact of the relay 15 is closed, the electromagnet 13 is turned on and attracts the core 12. The core 12 presses the table 6 against the spindle 2 through the spring 11 and the sleeve 10. Diagonally powered electrode sectors of piezoceramic plates 5 excite in them longitudinal and inferior deformations that cause oblique collisions of the plate points in the place of their contact with table 6. The trajectories of these points have a zlips shape and cause the rotary table to move in one circular direction (in this case against the clock hand). During one rotation of the table by the npe the shape of the 8 small linear displacement measures the eccentricity of the installation of the part 7 on the table. The eccentricity value is indicated by the indicator 14. Following reception, the table with the part is rotated until the fixed maximum eccentricity value is located at the tip of the transducer 8 and thus on the line of symmetry between the two piezo-ceramic plates 5. The switch 16 is moved to the right position, the electromagnet 13 is turned off which releases the core 12 and releases the table 6 from the spindle. The rights of the piezoceramic plate 5 are powered from generator 18 through another pair of diagonal electrode sectors. As a result, the plate point in contact with the table makes an elliptical movement, but in the opposite direction. Both plates move the turntable 6 along a straight linear path along the axis of symmetry of the arrangement of the piezoceramic plates. Since the table is unlocked, it performs a straight-line movement. The centering part 7 is preset with a small eccentricity of no more than a few tenths of a millimeter. Therefore, the disk of the turntable 6 does not get out of the engagement of the rectangular portions of the carbide rectangular gaskets 19 glued to the piezoceramic plates 5 in the zone of contact with the disk. The size of these shims is 3-5 mm, which is enough to perform a centering movement of 0.1-0.2 mm. The linear movement for centering is performed to the minimum indication of the converter indicator 14 with the required accuracy. After that, the switch 16 is again switched to the initial position, the electromagnet 13 is activated, clamping the table 6c by the part 7 in the centered position, and the part is rotated for accurate measurement. Centering operations are necessary for measuring parts such as heat of rotation on the circular gauges, as well as for measuring limbs, raster scales, code disks. In the latter case, a measuring microscope is used instead of a linear displacement transducer to determine the magnitude of the eccentricity. The operation of the device is easy to automate by introducing motion control from linear and angular displacement transducers or using a computer.

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Claims (2)

A CENTERING DEVICE, comprising a housing, a spindle placed in it, a generator, a table mounted on the spindle with the ability to move perpendicular to the axis of the spindle and designed to accommodate the centered part, a table movement drive made in the form of four pairs of piezoceramic transducers with electrode sectors for connection to the generator and mounted on the housing at the locations of their vibration nodes, a spindle rotation drive and an eccentricity indicator, characterized in that, in order to simplify the installation piezoelectric transducers are made in the form of two plates with four sectors of electrodes on each, located symmetrically with respect to the center of rotation and connected to the generator via a switch, and the table is equipped with a latch. 99961it * RS Aa 2 19 15 11 10 1 1113666 2