SU816699A1 - Apparatus for working cams - Google Patents

Description

(54) DEVICE FOR PROCESSING CAMS

one

The invention relates to a machine tool industry and can be used for machining cams, predominantly diametrically / which profile has portions of stands.

A cam processing device with a rotary table for a part and kinematically associated with it is known with a crank jl.

The profile obtained on this device does not have areas of dwellings that are characterized by a constant radius. To obtain such sections, it is necessary to have a kinematic connection between the crank and the rotary table, continuing to transmit the rotation to the table. Then, in order to obtain transitions (intervals) characterizing the movement of the cam mechanism, the kinematic connection between the crank and the turntable is restored.

Thus, in the process iz-. The preparation of a diametrical cam with portions of the dykes is necessary to retool the mechanism. Each changeover introduces an error in the profile of the cam produced, which causes a violation of their diametrality. Taking into account that the number of such readjustments is determined by the number of joints of the sections of the upstairs and transitions,

In the cam profile, 4 n errors are introduced.

The purpose of the invention is to obtain various profiles of multi-jawd cams with sections of dwellings without readjustment.

This goal is achieved by the fact that the kinematic connection between the table and the master crank is made in the form of gearboxes and the Maltese mechanism located between them, and the gear ratio of the gearbox between the SMART cross and the master crank {i)

0 and the gearbox between the crank of the Maltese mechanism and the table for the part (1d) are respectively

. 2n

--I

five

fne g - the number of grooves of the cross;

m is the number of crank shafts of the Maltese mechanism; n is the number of teeth of the cam produced.

The drawing shows the scheme of the device being plugged.

The device comprises a frame 1, in the directions of which the sled 2 is installed. In the guide sled that are parallel to the base of the bed, a carriage 3 is installed, on which the setpoint curve 4 and the turntable 5 are placed, as well as. kinematically connected gearboxes 6 and 7 and the Maltese mechanism with crank 8 and cross 9. On the carriage there is a flywheel 10 and a worm pair it, which links this flywheel to crank B. Guided by 13 slide 2, the slide is connected to the frame by a screw pair 14 with a flywheel 15. On the turntable 5 set the workpiece 16j 6 of which the working member 17 interacts. to arches.

The device works as follows x.

The flywheel etpaiteHHe 10 is fed through a screw pair to the crank.

8kaptyskogo mechanism. Continuous crank across the cross

9 and the gearbox 6 is converted into a discrete rotational movement of the crankshaft 4, which by the stone 12 and the fixed guides 13 of the slide 2, is converted into a discrete reciprocating movement of the carriage 3. carriage

Table 2 moves from one extreme position to another. This condition determines the gearbox OTHOiaeitne of the gearbox 6 When passing through the zippers outside the grooves of the cross 4c, the beam with the table in the Sasazkah does not jail,

at the same time, the continuous rotation of crank 8 through the gear 7 is converted into a continuous rotation of one hundred and five.

Thus, table 5 through 1 acquires a portable discrete reciprocating movement together with a carriage and rotational and interrupted movement relative to the carriage. this working body processing 17 | 1 cam profile on workpiece 16, mouth on the rotary table 5. The complete profile of one tooth is processed when two cranks of the crooked 8 are passed along the slots of the crust 9, while the carriage makes a complete oscillation. m.

When the pinholes pass outside the grooves of the cross, the radius sections of the profile are processed on the workpiece (sections of the stands). If the cam has an odd number of teeth, it has the diametral property due to the symmetry of the processing.

The magnitude of the amplitude of the carriage oscillation and the stroke of the machined cam. The cam is set by changing the length of the setting crank. The initial position of the workpiece relative to the working body and the correspondence to the minimum radius of the sections of the stands, equal to the radius of the initial cam washer, is determined by the movement

5 slide 2 with carriage 3 by means of a screw pair 14 from the flywheel 15

The proposed device makes it possible to produce cams with a rather wide range of variation in the ratio of the angles of the sections of the stands and transitions, which is expressed by the dependence

2. L & m Z.

-I

AT

and presented in the table.

thirty

About 0.666 1

2.33

TO

B

five

Claims (1)

1. Artobolevsky I.I. Mechanism in modern technology. M., Nauk, 1973, v. 3, p. 238.