SU865556A1 - Device for working cams - Google Patents

Description

(54) DEVICE FOR PROCESSING CAMS

one

The invention relates to the field of machine tool industry -v and can be used for machining cams, mainly diametrical, the profile of which has portions of stands.

A device is known which includes a turntable for a part and a driving crank, the kinematic connection between which is made in the form of gearboxes and the Maltese mechanism Cl}. However, this device has limited capabilities for obtaining portions of dwellings in the range of 0.4 values. The range of plots obtained here is determined by only two coefficients of 0.5 and 0.666. This circumstance limits the use of diametrical cams in drive mechanisms that convert the cam rotational movement into discrete reciprocating motion of the pusher.

In addition, the dynamic characteristics of the resulting cams in the transition areas have a high value. Thus, the dimensionless acceleration coefficients, which for the most part depend on the interaction of the crank and the cross of the Maltese external engagement mechanism, vary in size.

cases from 11.3 at up to 38.3 at, where Z is the number of grooves of the cross of the Maltese mechanism. The latter limits the possibilities of using these cams in high-speed and loaded mechanisms.

The purpose of the invention is to expand the technological capabilities of the device.

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This goal is achieved by the fact that the Maltese mechanism is made with internal engagement and a single bobbin.

The drawing shows the proposed 15 device.

The device includes a frame 1 in which rails 2 are installed in the rails. In the rails that are parallel to the rail guides, a carriage 3 is installed, on which the driver curve 4 and the rotary table 5 are placed, as well as the kinematically connecting gears 6 and 7 and the maltese internal mechanism

25 engages with crank 8 and cross 9. A flywheel 10 is mounted on the carriage, and a pair of worm gear 11, which connects this flywheel with crank 8. The driver 4 is connected by means of stone 12 to the guides 13 of the slide 2. Skids are connected to the frame screw pair 14 with a flywheel 15. On the rotary table 5, set the workpiece 16 / with which the working body 17 interacts. A straight line connecting the centers of rotation of the rotary table and the working body is parallel to the slide of the slider and carriage.

When the flywheel 10 is rotated, the movement through the screw pair is transmitted to the crank 8 of the Maltese mechanism. The continuous rotation of this crank through the cross 9 and the gear 6 converts into a discrete rotational movement of the setting crank 4, which with the help of stones 12 and fixed guides 13 of the slide 2 converts the discrete reciprocating movement of the carriage 3. When the crankshaft 8 passes through the slot of the cross, the crankshaft sp rotates at an angle and the carriage 2 with the table 5 moves from one extreme position to the other. This condition determines the gear ratio of the gearbox 6 in the direction from the cross to the setting crank, where Z is the number of grooves of the cross. When passing the bobbin outside the grooves of the cross, the carriage with the table in the slide does not move.

At the same time, the continuous rotation of the crank 8 through the gear 7 is converted into a continuous rotation of the table .5,

Thus, the table 5 receives a portable discrete reciprocating motion with the carriage and a relative rotational continuous motion relative to

In addition, the dynamic characteristics of the resulting profiles have rather low values. In particular, the dimensionless acceleration coefficients vary from 5.69 for Z 3 to 7.87, for z 12, the latter circumstance determines the preferred use of the cams obtained on the proposed projOM device with

0.2 4Kg 1.

Claims (1)

Claims A cam treater comprising a table for a part and carriages. At the same time, the working body 17 processes the cam profile on the workpiece 16 mounted on the turntable 5. The complete profile of one tooth is processed when the crank 8 of the crank 8 passes through the grooves of the cross 9, in which the carriage makes a complete oscillation and the two turns are full turns. This condition determines the gear ratio of the gearbox 7 in the direction from the crank 8 to the turntable i, j 2n. During the passage of the bobbin outside the grooves of the cross on the workpiece, the radius plots (sections of the stands) are processed. A cam with an odd number of teeth has a diametrical property due to the symmetry of the machining process. The magnitude of the oscillation of the carriage and the stroke of the cam to be machined is determined by changing the length of the setting crank. The initial position of the workpiece relative to the working body and, accordingly, the minimum radius of the sections of the stand, equal to the radius of the cam starting washer, is established by moving the slide 2 with the carriage 3 by means of a screw pair 14 from the flywheel 15. The proposed device allows for the production of cams with an extended region of drown sections. This area, determined by the values of the Kg coefficients, the ratio of the angles of the sections of the stands, and the transitional areas according to the dependence Z - 2   Z + 2 Presented in the table by the extended number of these coefficients in proKv 1. 1. 0.4 Table driving crank, kinematically interconnected by means of gearboxes and the Maltese mechanism, characterized in that, in order to expand technological capabilities, the Maltese mechanism is made with internal gearing and a single bobbin. Sources of information taken into account in the examination 1, USSR Copyright Certificate No. 2666658/08, cl. B 23 C 3/08, 1978. y ////////////////// y / /// y /////// 7 //////// tr. JO "