SU111598A1 - Fitting to circular grinding machines for continuous measurement of radial grinding force - Google Patents

Description

Devices and devices for laboratory measurements of radial forces during round grinding by means of electric sensors, made in the form of transversely movable spring-loaded carriages with center heads, are known.

The described device provides continuous control over the amount of radial grinding forces under production conditions, without limiting the technological capabilities of circular grinding machines.

This is achieved by: a) mounting the spring dynamometer on the nut of the screw mechanism of the transverse nodachi of the grinding headstock, whose screw is fixed and the nut is axially movable relative to the body of the grinding headstock, which is driven by the transverse feed drive; b) making a dynamometer in the form of two calibrated cup springs placed on both sides of the nut between the ends of the bearing and the stop rings of the nut, which interact in axial direction with a contact electric sensor mounted on the body of the headstock; c) the interaction of the nut with the contact electric sensor through a pivoting lever, the shoulder of which is acted upon by a supporting ball placed on the axis of the nut in the body of the end cap.

The drawing shows the device in two projections.

The proposed fixture is intended for use on circular grinding machines. The description is given in relation to a circular grinding machine on which the grinding head moves along sliding guides.

No. 111598-2 -

At the ends of the bearing 1, steel hardened thrust rings 2 are installed. The disk springs 3 (5 m thick) and 4 (2.5 mm thick) abut against these rings. The other spring rests on the thrust bearing 5 with its other end, and the ring is fixed The spring 4 rests on the steel hardened ring 6. Both springs are tightened with a nut 7, which is then locked. The nut 8 is pressed into the boss 9, in the center of which the ball 10 contacts the ball, swinging on two flat x springs 12. A plate 14 is fixed on the plate 13 with an inductive sensor connected by wire to a console in which a reading device with a scale graduated in microns is mounted.

If any force is applied along the axis of the nut 8, then due to the deformation of the springs 5 and 4, the nut 8 moves in the direction of the force. The lever 11, the end of which is always pressed against the ball, rotates simultaneously with the movement of the nut. The sensor measuring rod, down to the nilce end of the lever, moves, and by the movement of the arrow on the console, you can judge the amount of displacement of the nut 8. Since this displacement is functionally related to the magnitude of the acting force, you can determine and the value is reinforced, causing the nut to shift and the springs to deform.

In the absence of loads acting on the nut 8, when turning the gear 15, and hence the nut, the sensor should not give any indications.

A feature of the proposed design is the ability to p, the regulation of the axial stiffness of a node over a wide range. This is achieved by calibrating the nut 7, which is carried out as follows.

The rotation of the special nut with left and right threads creates the necessary load on the nut 8, measured by the plate dynamometer indicator, which with its other side is attached to a special stop attached (as well as the whole spring dynamometer) to the grinding headstock.

Between the ends of the disc spring 4, the rings B and the nuts 7, gaps are formed. After the special nut has been created, the nut 7 is tightened until the gap is sampled, which is easily established by the oscillation of the indicator needle. Then the load on the assembly is removed, the special nut is unscrewed and the dynamometer with an emphasis is removed from the headstock.

Thus, the spring dynamometer is tightened with a perfectly defined amount of force. The greater the tightening force, the greater the axial stiffness, which is adjusted in such a way that an axial force of 1 kg causes a deviation of the instrument arrow by 1.2-1.4 - AND / s.

After the calibrated clamping dynamometer, the grinding headstock is installed in the usual order on the guides of the base plate. By rotating the cross feed knob, the nut 8 is screwed onto the feed screw.

Measurement of the radial pressure on the machine is performed as follows. A certain radial pressure is applied to the grinding wheel during the grinding process from the part, which is mainly determined by the radial component of the cutting force (grinding). Radial pressure is not generated from the circle to the spindle, then to the spindle points and the body of the headstock. The force is transferred from the housing to the bearing. The nut 8 is engaged with the screw and cannot undergo any axial movements (unless the gaps in the thread are taken into account).

Under pressure from the side of the bearing / pulley, the spring 3 is compressed, the bearing / together with the plate 13, the holder M and the sensor moves along the nut 8. The lever 11 rotates and the force that caused the displacement can be judged by the sensor.

Subject invention

Claims (3)

1. Adaptation to circular grinding machines for continuous measurement of radial grinding force using a spring dynamometer and an electric stirring sensor, characterized in that, in order to enable measurement of the force under production conditions without limiting the technological capabilities of the machine, the spring dynamometer is mounted on the nut of the screw transverse mechanism feed the grinding headstock whose screw is angularly stationary and the nut is made axially movable from relative to the housing of the grinding head, in the bearing of which it is driven by the drive from the transverse filing. 2. The tool according to claim 1, of which there is a dynamometer made in the form of two tared disc springs, placed on both sides of the nut between the ends of the bearing and the stop rings of the nut, which interact in the axial direction with the contact electric sensor mounted on the body of the headstock. 3. Adaptation on PP. 1 and 2, characterized in that the nut interacts with the contact electric sensor through a pivoting lever, the shoulder of which is acted upon by a support ball placed on the axis of the nut in the body of the end cap.