SU952473A1 - Apparatus for working cams - Google Patents

Description

(54) DEVICE FOR PROCESSING CAMS

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The invention relates to machine tools and., Can be used to handle diametrical cams with a symmetrical profile.

Devices are known that have a similar designation with a displaced translational movement from a crankshaft, kinematically associated with a stone, a carriage and a rotary table mounted on it for a part, kinematically associated with the above-mentioned crankshaft 1.

However, the monotony of the basic law of carriage movement narrows the range of application of the resulting cams.

The purpose of the invention is the expansion of technological capabilities.

The goal is achieved by the fact that in the device the connection between the crank and the stone is made in the form of a two-wheeled planetary mechanism, the central wheel of which is rigidly mounted on the carriage, and the stone on the satellite hinged to the crankshaft.

In addition, the planetary mechanism is made in the form of hypocycloid transmission.

Moreover, the planetary mechanism is made in the form of an epicycloid gear.

The drawing shows a diagram of the proposed device.

The device comprises a frame 1, in whose guides a carriage 2 is installed. A carriage 3 is installed in a carriage rails that are parallel to the bed guides. 4 kinematically connected by a planetary mechanism

10 gear wheels 7 and 8 with a stone 9, and with the help of it - with guides 10 sleds 2. Sleds are connected with a bed of a screw pair 11 with a flywheel 12. A workpiece 13 is installed on the turntable 5, with which the tool 14 interacts.

The central gear wheel 7 of the planetary mechanism is rigidly fixed on the carriage, and the wheel 8 by means of joint A is mounted on the master wheel. With 2Q this, the master curve is simultaneously the carrier of the planetary mechanism. Stone 9 is connected to the satellite by means of pivot B.

Claims (3)

When the central wheel 7 is performed with internal teeth (shown), the planetary mechanism will be hypocycloid, and with external teeth - epicycloid. Right, connecting the centers of rotation of the rotary station and the working body, parallel to the direction of movement of the slide and carriage. When the setting crank 4 rotates, its continuous movement through the wheels 7 and 8, the stone 9 and the fixed guides 10 is converted into a continuous reciprocating movement of the carriage 3. Simultaneously, the rotation of the setting crank through the gearbox 6 is converted into a continuous rotation of the table 5. Thus, the table 5 receives a portable continuous reciprocating motion together with the carriage and a relative continuous rotational motion relative to the carriage. At the same time, the working body 14 will process the cam profile on the workpiece 13 mounted on the table 5. The full profile of one tooth is processed when the setting crank is rotated through an angle of 2 l, at which the carriage performs a complete oscillation. When the gear ratio of the gearbox 6 between the setting crank and the table is equal, where n is an integer number, the n-toothed cam will be machined on the workpiece. The characteristic change in the profile of each cam tooth, depending on the reciprocating movement of the carriage and expressed through the dimensionless path coefficient, is determined by the following dependencies: in the case of a hypocycloid implementation of the planetary mechanism (p-0 (l-coskri.) ± q l-cos ( pl) kril 5 2 (p -) ± q 1 -cos (p-Ori perform the plane of the epicycloid tare mechanism S ((t-os J- -S-Cl CosCp-H) hjl) 4 l-osCP- 0 0 where p and q are the parameters of the planetary mechanism, equal respectively to the ratio of the radius of the initial circumference of the central wheel to the radius of the initial circle the ratio between the hinges A and B to the radius of the initial circumference of the satellite, K is the dimensionless coefficient of rotation of the setting crank and cam when machining one tooth. The plus sign in dependencies (1) and (2) characterizes the external location of the hinge B (stone 9) with respect to the setting curve 4 in the initial position (shown by solid lines), and the minus sign indicates the internal location (dashed lines). With an odd number of cam teeth and a planetary gear parameter equal to an even number, the device will process diametrical cams with a symmetrical profile of each tooth. 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 distance AB and the position of the stone 9 relative to the hinge A (internal or external). The initial position of the workpiece relative to the working body and, accordingly, the radius of the cam starting washer is established by moving the slide 2 with the carriage 3 by means of a screw pair AND from the flywheel 12. The proposed device makes it possible to manufacture multident diametrical cams with enhanced symmetric profile characteristics dependent on the reciprocating movement of the carriage by changing the appearance of the planetary mechanism and its parameters. Claim 1. A device for treating cams with a displaceable displacement from a crank, kinematically associated with a stone carriage and a rotary table mounted on it for a part that is kinematically connected with a crank, in order to expand technological capabilities The kinematic connection between the crank and the stone is made in the form of a two-wheeled planetary mechanism, the central wheel of which is rigidly mounted on the carriage, and the stone - on the satellite, is articulated Mr. with crank. 2. A device according to claim 1, characterized in that the planetary mechanism is made in the form of a hypocycloid transmission. 3. The device according to claim 1, characterized in that the planetary mechanism is made in the form of an epicycloid gear. Sources of information taken into account in the examination 1. Artobolevsky I. I. Mechanisms in modern technology. M., “Science, 1973, Vol. 3, p. 238.