SU1664519A1 - Device for grinding cylindrical and conical holes - Google Patents

Abstract

The invention relates to metal working. The purpose of the invention is to improve the machining accuracy when grinding cylindrical and conical holes. The device comprises a spindle 2, a rod 10 coaxially arranged with it, mounted with the possibility of longitudinal movement and interaction with a radially movable tool holder 6, a grinding spindle 38, and a feed and shaping mechanism including a control ruler made in the form of a copier 31 with a pusher 28. Kinematic the rod 10 is connected with the pusher 28 by means of the crossbar 11. The middle of the crossbar is fixed in the stem 10, and the ends rest on the inner ring of the bearing 13. The outer ring 14 is under the dog is in contact with the plug 15. The plug is connected through the screw 16, the nut 17 and the double-arm lever with the pusher 28 of the copier 31. 1 Il.

Description

The invention relates to the field of mechanical engineering, in particular, machine tool industry, and is intended for use in machine tools, mainly in coordinate grinding.

The purpose of the invention is to improve the processing accuracy.

The drawing shows the proposed device, a longitudinal section.

The device comprises a housing 1 with a spindle 2 of rotation located in the sleeve 3 on the balls 4, providing both the movement of the spindle 2 in the axial direction and its rotation. In the lower part, the spindle 2 is provided with a carriage comprising a body 5 and a tool holder 6 with a fixed cam 7. The spring 8 is designed to press the cam to the roller 9 of the rod 10 connected by a crossbar 11 to an inner ring 12 located at the lower end of the spindle 2 and the rolling bearing 13 . The outer ring 14 of the bearing 13 interacts with a fork 15 connected to a screw 16 cooperating with a nut 17, which through axis 18 and sleeve 19 is connected to arm 20 of a cranked lever, allowing oscillatory movements on axis 21 fixed in housing 22. On shaft 10 there is the spring 23, which, against the ring 24 and 25, all the time, the rod 10 tends to lift up, but through the crossbar 11, the bearing 13, the fork 15, the screw 16, the nut 17, the axis 18, the shoulder 20, the axis 21, the shoulder 26, the axis 27, the pusher 28, the axis 29. The stone 30 is pressed against the ruler control - copy 31, placed on the slider e 32 moved by screw pair 33 on axis 34. Copier 31 can be rotated to the required angle with screw 35 and nut 36 through hinge 37. On the tool holder there is a grinding spindle 38. For carrying out the carriage feed, the device is equipped with a worm wheel 39, fixed on the nut 17, and the screw 40, which can be rotated from the handwheel 41 and the engine 42. To connect the casing 22 to the nut 17 there is a screw 43, which interacts periodically with the groove 44 of the nut 17, the casing 22 is connected to the spindle 2 via balls 45,

The device works as follows.

During the course of the spindle 2 down it moves the balls 45 down through the balls 45, which through the axis 21, shoulder 26, axis 27 moves the pusher 28 together with the stone 30 down, but since the stone 30 slides along the inclined surface of the copier 31, it together with the pusher 28 is also shifted to the left, turning the crank lever counterclockwise, and the arm 20 through the axis 18 additionally displaces the nut 17 together with the screw 16 downwards relative to the casing 22, and the screw 16 through the fork 15, the bearing 13 and

the crossbar 11 displaces the rod 10 together with the roller 9 relative to the spindle 2 additionally downward, compressing the spring 23, and the roller 9, interacting with the cam 7, displaces the latter relative to the spindle 2 together with the toolholder b to the left, i.e. The trajectory of movement of the grinding spindle 38 turned out to be inclined relative to the axis of the spindle 2. With the rotation of the same spindle 2 and longitudinal movement

5, the spindle 38 describes in space a conical surface, the angle of which is set by setting the copier 31 to a certain angle using a nut 36, a screw 35 and a hinge 37, the Maximum

0 tilt angle 20 °. When the spindle 2 moves upwards, the spring 23 does not allow the chain links to open, i.e. spindle 38 follows the same path, but in the opposite direction. When grinding cylindrical

5 surfaces, the nut 17 is connected to the casing 22 by the screw 43 through the groove 44 and the copier 31 is placed in a vertical position and is retracted from the stone 30 by shifting the slider 32 to the right by a screw pair 33. Feed to

0 Spindle insertion of the spindle 38 is carried out by turning the nut 17 from the handwheel 41 or the electric motor 42 through the worm to 40 and the worm gear 39.

Thus, increasing accuracy

5, the machining of parts is achieved by inserting a crossbar in the lower end of the spindle, the middle part fixed in the rod, and the ends resting on the inner ring of the rolling bearing fixed to the lower end of the spindle, and the outer ring of the bearing in contact with the fork, kinematically connected with the control ruler.

Claims (1)

Invention Formula 5 A device for grinding cylindrical and tapered holes, comprising a spindle, a rod coaxially arranged with it, mounted with the possibility of longitudinal movement and interaction with 0 by a tool holder mounted for movement in the radial direction and carrying a rotating grinding spindle, a feed and shaping mechanism including a ruler 5 controls with a pusher kinematically connected with a rod, characterized in that, in order to increase the machining accuracy, the kinematic connection of the rod with the pusher is made in the form of a crossbar, the middle part fixed in the rod, and ends are supported on the inner ring of contact with a fork, connected pointally mounted in the lower part by a spinning means of a helical gear and two rolling bearing, an outer arm with a ruler pusher ring which is installed with the possibility of control.