SU1271724A1 - Method of lapping internal taper surface of workpiece - Google Patents

Abstract

The invention allows high-throughput fine-tuning of the conical surface of parts having a significant initial deviation of the taper angle and the straightness of the generatrix. Lapping is carried out by a cylindrical grinding with a conical working surface. Lap and parts report rotation about their axes and relative reciprocating movement along the generatrix of the conical surface. In order to ensure high precision of the machined surface of the parts 1, the axial position of the lap 2 is adjusted during the finishing process, and when a bias appears, the axial force P with f is increased 1.3-1.6 times due to the creation of an additional force F. preventing the lap of the lap . 1 sec. f-ly, 2 ill. N3 4;

Description

f

The invention relates to the field of precision engineering and instrument-making and can be used in fine-tuning the cones in the housings of diesel nozzle atomizers.

The purpose of the invention is to increase the productivity of finishing the surfaces with significant deviations of the angle of the cone and the straightness of the generator by increasing the pressure of the lap in processing the irregularities revealed by axial displacement of the lap.

Figure 1 shows the scheme of finishing the conical surface of the part; Fig, 2 - diagram of the forces acting on the ground.

To finish the part 1, a cylindrical grinding lap 2 with a conical working surface 3 is used. Parts 1 report a reciprocating movement along the generatrix of the conical surface with the help of, for example, cam 4, pusher 5, tool 6. The lap is mounted with the possibility of axial movement in the guides 7. A spring 8 serves to create a ground pressure on a part of a constant value, and an electromagnet 9 serves to increase it, creating a force preventing the grounding from moving.

During the refinement process, the following forces act: P - axial force acting on the lap; R is the reaction force from the part to the axial force; R is the horizontal component of the reaction force; Ku is the vertical component of the reaction force; F (, force preventing movement of the head.

The refinement process is carried out as follows.

The part 1, fixed in the fixture 6, and the lap 2, installed in the guides 7 with the possibility of axial movement, receive rotation from the drive. Drive and rotation transmitting elements are not specified. The spring 8 makes constant contact between the conical surface of the part 1 and the lap 2 in the process of refining, providing a predetermined pressure. At the same time, the cam 4 through the plunger 5, connected with the tool 6, reports the reciprocating movement of the workpiece 1 by some value e at an angle of 177 242

the specified conical surface of the part and the lap.

Under the influence of force R, the grounding axis receives a deflection

5t

f -%

  j

where j is the stiffness of the bending lap.

Thus, the equilibrium condition of the forces applied to the lapping is

P cCo1 J-. “.

J

where c (is the half angle of the cone.

If deviations from the linearity are absent, and the angle e coincides with the angle of movement of the part, then the process of fine-tuning is carried out in the equilibrium condition without axial displacement of the lap. If there are deviations from the linearity or angle c (does not coincide with the direction of movement of the part, then a new equilibrium condition arises

R - IP). g.

Under these conditions, the pressure on the surface to be treated will increase by a value determined by the expression

&.R

S sinc

5 where S is the contact area. I

It has been established experimentally that when fine-tuning a conical surface with deviations, the optimum force is a force within 1.3-1.6 times the axial force P, This force is provided by the characteristics of an electromagnet mounted in guides 7.

Measurements of the machined parts in fine-tuning with constant force and the proposed method with a cycle time of 60 s are given in the table.

From the table it can be seen that with the same duration, the treatment by the proposed method provides 100% yield of suitable parts with significant initial deviations of the conical surface. Due to this, the performance improvement of such parts is improved.

Claims (1)

Thus, by increasing by 30-60% the force acting 31 on the lap at its axial displacement, an increase in the productivity of the finishing of parts with significant deviations of the angle of the cone and the straightness of the generator is achieved. Claims The method of finishing the inner conical surface of a part with a cylindrical lap with a conical working surface, according to which the lap and parts report rotation about their axes, the parts report 244 reciprocating alternation along the conical surface forming it, and the pressure of the priter on the part is carried out in axial direction, characterized in that, in order to improve the performance of surface finishing with significant deviations of the angle of the cone and the straightness of the generator, During the finishing process, the axial position of the lap is recorded and, when bias appears, the axial force is increased by 1.31.6 times. The average value of removal of metal17, 6 la, microns 58 ° 45t Yu (by 20% det.) 58 ° 45 + 15 (by 20% det.) Up to 2 microns (60% det.) And, Up to 3.5 microns (40% det.) 0.32 23.1 58 ° 45 + 10 (100% det.) Up to 2 microns (100% going.) 0.32 ABOUT 1