SU1618604A1 - Arrangement for single-sided lapping of flat surfaces of parts - Google Patents

Description

The invention relates to the field of abrasive machining and can be used on one-sided flat-jointing machines with an oscillating priter movement for machining predominantly cylindrical parts such as high discs and bushings (with a ratio of height to diameter of 0.3 and more).

The purpose of the invention is to increase the productivity and accuracy of processing predominantly cylindrical

Parts such as high discs and bushings due to the elimination of the tipping moment acting on the part.

The drawing shows a device for one-sided finishing of the flat surfaces of parts, a longitudinal section.

Device for one-sided flat finishing of parts on machines with priter 1, containing a spring-loaded rotating shaft 2, lower end

 which through the ball bearing 3 with the lead 4 is connected with the center 5 of the cassette 6, in the holes 7 of which parts 8 are installed. The holes 7 for the installation of parts 8 in the cartridge 6 are made through and two-step. The upper level of the hole at the upper end of the cartridge is made diameter, 1.5-6 mm greater than the diameter of the bottom of the hole at the bottom of the cassette. Step hole A y

The bottom end of the cassette is made 1.0 to 5.0 mm in diameter, 0.01, 1.5 mm (&) larger than the diameter of the part. The cassette 6 by means of elastic elements, such as flat springs 9, is associated with the upper yoke

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10, on which the sleeve 11 with one socket is fixed on the lower end side. A non-deformable, for example steel, ball 12 is installed in the socket, interacting with the lower end of the upper casing 10 and the upper end of the lower casing 13 mounted on the sleeve 14 with the possibility of swinging and horizontal movement. The nest in the sleeve 11 is made coaxially with the hole 7 in the cassette b. The flat spring 9 is connected to the cassette 6 by means of a lug 15 and screws 16 and 17. The upper collar 10 is attached to the flat spring 9 by threaded connection with a nut 18. Elements 9-14 are the mechanism for pressing the workpiece 8 to ground 1. Step B surface holes 7 at the lower end of the cassette 6 can be made convex in radial section.

Parts 8 are mounted on the lap 1 with the applied paste. On top of the parts 8, the cartridge 6 is put on top of the cartridge 6 up to the bottom stop 13 in the upper end of the parts 8. After this is the spring-loaded shaft 2, located with eccentricity e to the axis of lap 1, the lower end with ball bearing 3 is inserted into. the tapered center 5 of the cassette 6 and create the required clamping of the parts 8 to the lap 1. The axial direction of the hole 7 is clamped through the kinematic chain of the ball bearing 3 - cassette 6 - spring 9 - upper sleeve 10 - ball 12 - lower sleeve 13 - part 8 - lap 1. Turn on the machine. At the same time I lap 1 posts5 16

plane-parallel circular oscillatory motion along a complex non-repeatable raster path, and

Cassette 6, by rotating the shaft 2 with the ball bearing 3 and the driver A, imparts a rotational movement. During the lapping process, the direction of movement, of grinding 1 is periodically changed. When the direction of movement of grinding 1 is changed, the direction of application of forces to the part 8 changes.

When the direction of movement of the priter is changed under the action of the cutting force, the part 8 moves and the hole 7 until the gap D is selected and the side wall of the part 8 does not come into contact with the side surface of the hole 7 of the cartridge 6. It should be noted that the amount of movement of the part 8 hole 7 does not exceed the gap & and is 0.01-1.5 mm. When moving detal-8 relative to the cassette 6, the lower casing 13 simultaneously moves relative to the cassette 6 and its elements. Moving the yoke 13 relative to the cassette 6 and the upper yoke 10 is accompanied by a free rolling of the ball i 2 (mounted in the slot of the sleeve 11) over the surfaces of the sleeves 10 and 13, considering that the force of rolling of the ball 12 on the surfaces of the sleeves 10 and 3 is negligible compared to with the cutting force (friction force of the part 8 o lap 1), the movement of the part 8 relative to the cassette 6 when changing the direction of the lap motion will not be accompanied by the occurrence of an overturning moment acting on the workpiece. Further movement of the priter 1 after the contact of the side part 8 with the side surface of the opening 7 of the cartridge 6 causes the part 8 to interleave.

 with respect to priter 1, due to which metal is removed. Wherein

 the side surface of the opening 7 of the cassette 6 acting on the part 8 is made as close as possible to

 processing plane. The gap between the lower end of the cassette and the lapping is 1–3 mm. When finishing the cassette, the top step of the opening of the cassette never contacts the side surface of the part, having a gap in the range of 0.5 - 1.0 mm. Insignificant distance between points:

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application of force to the cut-off (one application of force is located in the plane of the working surface of the lap 1, and the second point of application of force is in a plane parallel to the working surface of the lap 1 at a height of 1 - 5 mm at the point of contact of the side surface of the part 8 with the lateral surface

The Q hole 7 of the cassette 6) results in a tipping moment acting on the part 8, the magnitude of which does not cause the fungus between the surface to be treated.

5 After the removal of the specified allowance, the machine is stopped, the shaft 2 is raised. The fixture is removed from the parts 8, and the parts 8 are removed from the lap 1. The bottom surface of the lower yoke 13,

0 in contact with the upper end of the part, can be made both flat and any other special form depending on the configuration of the end of the part.

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Claims (2)

1. A device for one-sided finishing of flat surfaces is detailed, 0. Containing a through a ball bearing with a driver and with a rotating shaft - a cassette with holes for ;: installation of HOW and parts and the mechanism of the datapad to the surface of the prits,: , what. with the aim of improving the performance and accuracy of the processing of predominantly cylindrical parts such as high disks and bushings due to the exclusion Q tilting moment acting on the part, the holes of the cassette are two-stage with a smaller diameter at the lower end of the cassette; filled in the form of a sleeve with a ball placed in its opening, coaxially with the hole of the cassette, and two sleeves located along the ends of the sleeve, the upper of which is rigidly connected to the sleeve and using a flat spring with the cartridge, and the lower one is intended for contact with the part and mounted on a sleeve with the possibility of swinging and moving in a horizontal plane. 2. The device according to claim 1, about tl and is that the step surface of the opening at the lower end of the cassette is made convex in radial section.