SU1252142A1 - Apparatus for flat-parallel lapping of parts - Google Patents

Description

one

Hjo6peTeHHe relates to mechanical processing, namely the area of two-sided abrasive and non-abrasive finishing of flat surfaces, and can be used for finishing, for example, thrust washers, sealing rings, flat spool pairs, piston rings, as well as end measures of length and other similar parts .

The aim of the invention is to improve the quality of fine-tuning of parts by ensuring uniform wear of the working surface of the lap while simultaneously simplifying the design of the device.

FIG. 1 shows a device, a front view in section of FIG. 2 - the same, top view (upper lap is not shown); FIG. 3 shows the trajectories (fat line) of the movement of an arbitrary point B of the workpiece during one cycle of relative movement.

The upper and lower lap 1 have a disk shape with a working surface. in the form of flat ring tracks.

The coaxiality of the ring tracks provides pin 2, which connects both

lap through the center hole The lap connection is made with a gap that allows the upper lap to move only in the vertical direction and self-aligning along the machined surfaces of parts 3 and 3 placed in the slots of the disk separator 4 with a uniform arrangement along the ring track. NZGZhNIY priter and pin 2 are installed and fixed on a flat table 5.

Assembled lap-ups 1, parts 3, separator 4 and table 5 are placed with a gap inside the cylindrical cavity of the connecting rod 6, made in the form of a glass, and installed with it on the horizontal plane of the base 7, which has a box-like shape.

Lower lap and table 5 set

The crankshaft is stationary, and the connecting rod o is connected to the base by a double articulated parallelogram 8 that can be displaced in the horizontal plane and pivotally connected to the drive room 9 through the adjustable eccentric 10 positioned in it, which projects above the horizontal surface of the base 7.

,

j 10

15

20

25

,

. SL

e- 55

35

40

45

422

The drive shaft 9 and the electric actuator I1 are mounted inside the base 7 and are connected by a V-belt transmission 12. To lift the upper lap when loading and unloading parts, as well as to increase the working pressure greater than the weight of the upper lap, the lifting-loading device 13 mounted on the upper parts of the box base 7,

The design efficiency determines the gap with which the lap 1, separator 4, parts 3 n table 5 are placed inside the cylindrical cavity of the connecting rod 6, therefore the gap S on the periphery of the separator is always less than the stroke of the connecting rod, i.e. double magnitude of eccentric mixing from the axis of the - water shaft. The most optimal non-width of the gap is in the range of 0.5-1.5 mm. The gap along the contour of lap 1 and table 5 is always greater than the maximum stroke of the connecting rod.

The parts to be machined are placed on the working bed of the lower lap in full or in part of the nest of the separator, taking into account the uniform distribution. Then, using a lifting and loading device 13, the upper lap is lowered to contact with the parts and loaded to the design pressure. When this pin 2 is included in the Central hole of the lap and ensures the alignment of the annular tracks, the width of which, as the most optimal, made according to the size of the outer diameter of the workpiece.

The main finishing movement is carried out from the electric drive 11 -, - which rotates the drive shaft 9 and the eccentric 10 through the wedge-drive transmission 12. Moreover, the eccentric 10 displaced relative to the axis of rotation of the drive shaft 9 is twisted off from this axis around a circle with a radius of equal to its displacement. The amount of displacement is adjusted by turning the eccentric 10 in the hole of the drive shaft 9, in this case from 0 to 10 mm. The doubled displacement amount determines the stroke of the shield 6 in motion along the same circumference as the eccentric 10.

The double articulated parallelogram 8 excludes the possibility of angular movement of the connecting rod 6, forcing it to move in parallel along a circle3

howl trajectory. All points of the connecting rod body, as well as any part attached to this case, move along identical circular trajectories m. For this: the same reason disk separator 4 and parts 3 placed inside the cylindrical cavity of the connecting rod 6 and being in constant contact with him, make a circular motion, which is the main movement of the refinement.

In addition to the main finishing movement, the parts make an auxiliary movement along the working surface, ensuring uniform participation in the work of its entire surface.

The movement of parts along the working surface of the lap is carried out by the separator 4 when it is rolling without sliding on the inner cylindrical surface of the rod 6, the twisting force for the separator is the friction forces between parts and lapways, which are directed in one direction.

The resulting friction force is given in. the center of the separator and creates a torque about the contact point A of the separator with the connecting rod (Fig 2). During one revolution of the drive shaft, the direction of the resulting friction force smoothly changes by 360 and rolls the separator along the inner surface of the cylindrical cavity of the connecting rod. The difference in the lengths of the circumferences of the inner cavity of the connecting rod and the rim of the separator determines the longitudinal flow S of parts along the working priter, per turn of the drive shaft (ig, 3),

In practical application, it is more convenient to express the longitudinal flow in terms of the gap between the walls.

521A24

the cylindrical cavity of the connecting rod 6 and the rim of the separator A, which is equal to the ratio of the longitudinal feed to the arithmetic constant value L 5 3.14, i.e., the longitudinal feed is approximately three times larger than the gap. In order to obtain a longitudinal feed of mm / rev, the gap 6 along the contour of the separator is 1 mm. 10 By the same law, an auxiliary movement of parts in the separator slots is performed. The size of the gap 3 in this case determines the rolling speed Tjb of the part along the inner f5 of the surface of the separator socket and is approximately 0.5 mm.

On the workpiece surface there remains a grid of microrelief, representing a picture of the imposition of a numerical set of circular strokes (vortices),

The uniqueness of the trajectories, the repeated intersection of the strokes form the roughness of the surface 5 of the part being processed within 0.1-0.05 µm, and the continuous change in the direction of the finishing movement intensifies the finishing process, since the abrasive grains animated in the pripire work with Increasing the cutting ability of lap.

The constant cutting speeds and accelerations throughout the entire finishing cycle related to the part, the absence of large inertial forces of the moving parts of the device allows the flatness and non-parallelism of the processed surfaces Q to be within 1-0.5 μm, while the initial working surface lap in its quest to its ideal form and serves as an example of automatic editing of lap 5

five

Compiled by A. Kozlov Editor A. Vorovich Tehred A. Kravchuk Proofreader M. Pojo

Order A572 / 17 Circulation 740 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

FIG.

Claims (1)

DEVICE FOR FLAT-PARALLEL FINDING OF PARTS located in the nests of a separator located with the possibility of moving in a horizontal plane between two fixed laps coaxially mounted on the base and connected to the drive by means of a connecting rod and pivotally mounted to the last clown mounted on the drive shaft, leaving the person ° It is clear that, in order to improve the quality of processing and simplify the design of the device, the connecting rod is made in the form of a glass, in the cavity of which there are n and the separator, and is connected to the base by means of a hinged parallelogram inserted in the device with the possibility of plane-parallel movement in the horizontal plane, while the gap between the separator periphery and the inner surface of the cup is selected no more than twice the amount of displacement of the eccentric from the axis of the drive shaft. 1,125