SU918051A1 - Method of vibration-working of parts - Google Patents

Description

The invention relates to the field of vibration treatment and can be used in various fields of engineering for finishing and surface treatment of parts. There is a known method of vibration processing of parts in containers, installed by a carrier that receives rotation from an electric motor around an external motor located between containers and axes with respect to their working cavities Ul. The disadvantage of the known method of vibration treatment is the low productivity of the processing process, due to the fact that the oscillatory movements of the containers are soobraziot along a linear trajectory. The aim of the invention is to intein processing the process. For this, the containers are mounted on the carrier motionless, and the carrier is reported to oscillate in a plane perpendicular to its axis of rotation, wherein the rotation of the carrier is communicated with an angular velocity determined by the inequality; "W S -v where W is the angular velocity of rotation of the container, g is the acceleration of gravity, m / sJ; R is the distance from the axis of rotation of the container to the maximum specific point of its cavity from it, m; And the amplitude of oscillation of the container, m. A variant of the device that implements the proposed method is schematically shown in figure 1 and 2. Figure 1 shows the device, a general view; figure 2 - section aa in figure 1. The method is carried out using a device that contains an elastically mounted carrier 1, on which two containers are attached. The container 2 is designed to handle the bulk of small parts 3, and the container 4 is designed to handle fixing complex-shaped parts 5. The oscillatory movement of the carrier 1 and the containers 2 and 4 are communicated by an exciter 6 driven by an electric actuator 7. They also receive rotational movement from the electric actuator 8 and the axis of rotation is external with respect to the cavities of containers 2 and 4. The working medium is abrasive granules 9. During operation of the device, there is an intensive mixing of the working medium 9, and that Also, the uniform and regular spatial movement of the workpieces 3 and 5 relative to their gravity vectors (Directions of rotation of the vibration exciter b and the carrier 1 with containers 2. and 4 are shown in Fig. 2 by solid arrows, and the direction of circulation of the working medium 9 relative to the walls containers 2 and 4. - dashed arrows). In this case, the counter rotation of the vibration exciter B and the carrier 1 with containers 2 and 4 is preferable, since in this case it reaches c the maximum circulation speed of the working medium. The condition that prevents the formation of stagnant zones and ensures uniform mixing of the working environment is an expression; Рц, man mg (1) where Рц, gpl%. - - maximum value (R + A) of the centrifugal force acting on the granule of the working medium farthest from the axis of rotation; m is the mass of the granule; R. - distance from the axis of rotation of the container to the point of its cavity maximally removed from it (granule size as compared to R can be neglected A - amplitude of container oscillations; UJ - angular rotation speed of container; g - acceleration of free fall. If the condition is not met (1 a) the working medium, partially or completely (depending on the angle of rotation of the container) is pressed against the peripheral walls of the container by centrifugal forces, which reduces the intensity of its mixing and, consequently, productivity and quality Processing: When containers 2 and 4 rotate around an axis, more easily with respect to their cavities, with a speed defined by expression (1), the productivity and quality of machining of parts processed both in bulk and with fastening is improved. Experimental processing of parts was carried out in two ways: without rotating containers and with rotation (according to the proposed method). In one container, small parts were processed in a pile, and in the other, processing with fixing of difficult-fitting parts. The treatment in both cases was carried out for 60 minutes with an amplitude of 5 mm oscillation of the containers and a frequency of 24 Hz. The distance from the axis of rotation of the containers (when processing by the proposed method) to the points of their cavities as far as possible from it was 635. The condition of the possibility of processing was the inequality obtained from the expression (1): 0, ..., 005 r / min. The processing by the proposed method was carried out at an angular velocity of rotation of containers and 2.6 r / min. Part material - D1bT.

Average specific eat

metal, g / cm

Average depth of work sheet overlap, mm

The average surface is the micron-roughness height of machined surfaces, µm

0,0054

0,0042

0,0048

0.45

0.34

0.40

1.6

2.0

1.8

The results of the comparative processing, are given in table. have shown that when processing by the proposed method, its productivity and quality increase. The application of the proposed method will improve the processing performance by 10-25% while improving the quality of processing detschy.

Claims (1)

1. USSR author's certificate No. 768612, cl. On 24 May 31/06, 1978. -BUT s