SU551157A1 - Device to control the movement of the tool holder - Google Patents

Claims (2)

ka; in fig. 4 - part of the device using a capacitive sensor. Mounted in the bearings of the housing 1, the swing shaft 2 carries a flange 3 with radial guides 4, on which the slide 5 is mounted with a holder 6 equipped with an abrasive bar 7. With the housing 1 are attached the elements of the base of the workpiece. 8, for example, the inner ring of a ball holder, which is driven in rotation by a drive (not shown in the drawing); these elements are represented as radial bearings 9. On the flange 3, a cylinder 10 is pressed into the bar, the cavities of which are connected to the distributor through channels 11 and 12. The rod 13 of the cylinder 10 is connected to the slide 5 by an elastic element 14. The slide 15 is mounted on the slide 5 connected to the signal measuring unit or automatic control, and on the flange 3 there is a cylinder 16, the rod 17 of which interacts with the sensor 15. The hydraulic cylinder 16 and the SHO 17 form the base — the reference point of the sensor 15 movements. The working cavity of the cylinder 16 is connected to the feed line 18 of the feed dr Ossel 19, in parallel with which a check valve 20 is connected, and with a drain through a safety valve 21. A piezoelectric sensor 15 can be used as a sensor (Fig. 3, in the case of which is fixed to the slide 5, the piezoceramic element 22 is placed and the case is filled with a sealing composition 23 , for example, epoxy resin. The rod 17 interacting with the sensor is pressed to it through the ball 24. The sensor can be capacitive (FIG. 4), one of the plates 25 of which is fixed on the slide 5, and the other facing 26 - on the rod 17; when the stem 17 is fully pressed to the sensor, the plates 25 and 26 are separated by a dielectric layer 27. The sensor is protected by a flexible seal 28. Consistently with a non-return valve 20, the valve 29 is turned on bypassing the throttles 19 (Fig. 1). After the end of the treatment cycle, pressure is applied through channel 12 to the lower cavity of cylinder 10; the slide 5 with the holder 6 and the bar 7 go upwards. The sensor 15 raises the rod 17; at the same time, the oil from the working cavity of the cylinder 16 is displaced, mainly to drain through the safety valve 21. Next, the finished part is removed, replaced with the next workpiece 8 and pressure is fed through the channel 11 into the upper cavity of the cylinder 1O; the rod 13 through the elastic element 14 lowers the slide 5 with the holder 6, pressing bar 7 to the work chute of workpiece B. By applying pressure into the cavity of cylinder 16 from feed 18 through the check valve 20, rod 17 is pressed to sensor 15. During processing, workpiece 8 The bar 7 is driven by swing shaft 2 in reciprocating rotation (swing) in (Fig. 2). Due to the toroidal shape of the working surface of the bar and possible deviations of the axis ZO of the swing shaft 2 from the chute plane 00 of symmetry (Fig. 2), a radial release of the bar 7, the holder 6 and the slide 5 along the guides 4 occurs at each swing cycle due to the elasticity of the elastic element 14 and other elements of the system. In the device (as shown in Fig. 3), the sensor 15, when it moves upwards, presses through the ball 24 onto the rod 17, displaces oil from the cylinder 16 through the throttle 19. With a sufficiently fast radial movement of the bar and the associated elements (frequency sweep about 5-15 Hz) the pressure in the cylinder increases when throttling the oil and, accordingly, the force compressing the piezoceramic element 22 of the sensor 15, which converts the change in force into an electrical signal, increases. When the sensor moves downward, the oil coming from the make-up line 18 through the check valve 20 and a constantly open (in the device according to FIG. 3) valve 29 into the cylinder 16 provides the force closure of the rod 17 with the sensor 15. Constant and very little variable due to the properties of the piezoceramics, the sensor does not react. In the device (FIG. 4), the sensor 15, similar to the one described above, pushes the rod 17 upwards, displaces oil from the cylinder 16 through the throttle 19. The valve 29 closes during operation of the measuring device, and as the sensor moves downward, the oil flows from the feed line 18 in the cylinder 16 also through the throttle 19. With the rapid movement of the sensor 15 down the rod 17 does not have time to follow him; the gap between the plates 25 26 of the capacitive sensor increases. With periodic radial movement of the bar and associated elements between the sensor plates, a gap is created that is larger than the original, determined by the thickness of the dielectric layer 27. With slow radial movement associated with the wear of the bar, throttling the oil does not prevent the rod 17 from following the sensor 15. Signal Sensor 15 can be used both for visual inspection and for controlling the process of automatic alignment of the swing axis with the plane of symmetry of the trough. Claim 1. A device for controlling movements of a tool holder, comprising a sensor interacting with a base and a holder, characterized in that, in order to exclude signals from constant and monotonically varying component movements, for example, due to tool wear, the base is made movable and equipped with a drive for tracking the movement of the holder. 2, The device according to claim 1, characterized in that the base is made in the form of a hydraulic cylinder rod, and the tracking drive comprises a damper, for example a hydraulic choke. 3. The device according to paragraphs. 1 and 2, characterized in that a piezoceramic sensor is used as a sensor, and a check valve is connected parallel to the throttle. 4. The device according to claim 1, which is based on the fact that the sensor is made capacitive. Sources of information taken into account in the examination: 1.Ilinsk A. and others. Semiconductor strain gauges, M., 1966, p. 113, FIG. 41 2. Yorschi Yu. I. Vibrometry, M., 1963, p. 569, FIG. 14.53 (prototype). F (g.1 f. L 25 Fug.Z