SU984838A1 - Damping device - Google Patents

Description

(54) DAMPING DEVICE

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The invention relates to mechanical engineering, in particular to the abrasive treatment of metals.

It is known a device used in sliding bearings, which contains special self-aligning segments (liners) with a curvilinear surface, facing the shaft so that a wedge cavity is formed into which a rotating wedge is injected, which has damping shaft oscillations 1.

The disadvantage of this device is that it does not allow to fully damp the oscillations of the grinding wheel, which is one of the main shaping elements of the AIDS system and is constantly experiencing during the work of the disturbance from the imbalance of the grinding wheel, the initial error of the workpiece, the unevenness of the cutting properties of the circle and 20, etc., which makes it difficult to obtain products of high accuracy. In addition, the use of such a device for a grinding wheel, which constantly wears by a considerable amount, especially when editing, does not give a positive result, since the gap between the circle and the pads is constantly increasing and the liquid wedge capable of damping wheel oscillations does not form.

The purpose of the invention is to reduce the waviness of the treated surface by damping the vibrations of the grinding wheel.

The goal is achieved by the fact that the segment pads, at least in the amount of one pair, are set to dia. opposite the working surface of the grinding wheel, moreover, the radius of curvature of the pads is 1.1-1.2 of the radius of the unworn wheel, and to ensure that fluid enters the wedge-shaped s, the gap between the wheel and the pad, the initial portion of the latter is made straight and skewed opposite to the rotation of the circle, for automatically setting the pads to a predetermined distance from the surface of the circle as it is worn, the device is provided with a follow-up drive.

Claims (1)

FIG. 1 shows the device, a general view and a block diagram of a follower with water; in fig. 2 shows the layout of the pads relative to the grinding wheel; in fig. 3 is a view A of FIG. 1. The damping device for the grinding wheel 1 is made in the form of pads 2 with a curved surface, for example a cylindrical one, facing the grinding wheel so that a wedge cavity is formed. From the pipe 3 cutting fluid is fed into the gap between the circle and the pads. The pads are attached to brackets 4 with the possibility of moving. radial direction with respect to the grinding wheel. For automatic installation of the pads at a predetermined distance from the surface of the circle, a servo drive is used, which includes a sensitive transducer 5 (for example, a membrane pressure sensor) whose sensing element 1 is a membrane 6, a driver 7, a comparison device 8, a booster device 9, an engine 10 direct current, worm gear 11 and screw 12 gear 12. The device works as follows. A coolant from a nozzle is fed by a rotating grinding wheel and is injected into the wedge cavity between the wheel and the pad, where a hydraulic wedge is formed, which has a damping effect on the grinding wheel. To enhance the damping effect, the device may contain several pairs of pads diametrically opposed to the circle, as close as possible to the plane passing through the axes of rotation of the circle, as the oscillations of the circle in this plane cause the appearance of undulation on the treated surface to the greatest extent. When the pressure in the wedge-shaped cavity decreases due to wear of the grinding wheel and the gap between the wheel and the pad increases, the magnitude of the signal 13 from the sensitive transducer 5 connected through the wedge-shaped cavity changes. The signal 13 enters the comparison device 8, which simultaneously receives a signal 14 from the driver 7, which is tuned to a certain amount of pressure in the wedge-shaped cavity. This pressure value corresponds to the optimum distance between the wheel and the shoe. In the comparison device, an error signal 15 is generated, which is amplified by the amplifier 9. The amplified signal 16 is fed to the DC motor 10. The rotation of the engine is transmitted through the worm gear 11 and the screw-nut gear 12 to the pad 2, which moves towards the grinding wheel until the pressure in the wedge-shaped cavity increases and in the comparison device the error signal 15 becomes equal to zero. In order for the angle between the pad and the circle to vary as little as the latter wears, the radius of curvature of the pad is no more than 1.1 -1.2 of the radius of the unworn grinding wheel. The initial section of the pads 2 is made straight and sloping in the direction opposite to the rotation of the circle so that the air flows generated by the rotating grinding wheel do not prevent the ingress of liquid into the wedge-shaped cavity. The use of the proposed device makes it possible to reduce the undulation of the ground surface by damping the vibrations of the grinding wheel, and also to effectively dampen the oscillations of the wheel regardless of its wear. DETAILED DESCRIPTION OF THE INVENTION A damping device comprising segmental pads with a curvilinear working surface, characterized in that, in order to reduce the waviness of the treated surface by ensuring effective damping of the grinding wheel oscillations, the segmental pads are diametrically opposed directly on the working surface to go (}) with an oval circle, and the curvature of the pads is 1,, 2 of the radius of the unworn grinding wheel, and the initial section is made straight, so that The device is equipped with an automatic sequential drive ensuring a predetermined distance of the pads from the working surface of the grinding wheel. Sources of information taken into account during the examination 1. Chernavsky S. A. Sliding bearings. M., Mashgiz, 1963, p. 118-165.