SU1333546A1 - Method of working parts with freely-flowing abrasive mass - Google Patents

Abstract

The invention relates to mechanical engineering technology, in particular, to methods for preparing the surfaces of machine parts for coating them, and can be used in engineering and repair enterprises of the industry. The purpose of the invention is to intensify the process. Parts 4, which are placed in the fluidized bed 3 of the abrasive, are reciprocated in mutually perpendicular planes. In the vertical plane, the oscillation is created by ejected abrasive flows that are directed to the part from opposite sides of the compressed air, while the speed of one jet is increased, and the other is reduced simultaneously by the same value. 1 il. 9 with co. with SP 4 O5

Description

The invention relates to mechanical engineering technology, in particular to methods for preparing the surfaces of machine parts for applying coatings on them, and can be used in engineering and repair enterprises of industry,

Purpose1} of the invention to intensify the Processing.

The drawing shows the scheme of. implementation of the method

The diagram shows a fluidization apparatus with a gas distribution grid 2 and a fluidized bed 1 with a layer 3 of abrasive in the form of a shot in which the part 4 is immersed, suspended on a suspension bracket 5c mounted on a rod 6. On the side walls of the fluidization apparatus are ejectors 7 with windows 8 immersed in a fluidized bed - worn fraction layer. When machining a part, the fractional shot emanating from the nozzles of the ejectors 7 located on both sides of the part 4 being machined increases the speed of the jet flowing from one ejector, respectively simultaneously reducing the rate of jet outflow from the opposite ejector. Under pressure from the jets with increased speed due to a decrease in the resistance, the firing of the jet under the action of the jet with reduced speed, part 4 together with suspension 5 rotates at some angle around the horizontal axis of rod 6. After a corresponding change in the speed of the outflow of jets from the ejectors nozzles 7, part 4 rotates the same angle is in the opposite direction, providing, in a ghakim way, the processing of new areas of the treated surface. With equal velocities emanating from the nozzles of both ejectors 7, part 4 remains in place in an upright position. When part 4 is deflected under the action of a jet with a higher speed, its distance to the nozzle is increased in proportion to the pressure of the jet, thereby reducing the impact force of the pellets on the surface of the part and vice versa, as the jet nozzle is cut from a low jet outflow speed the impact of the pellets on the surface of the part increases. Thus, the force of the blows of the fraction on the surface of the treatment is automatically maintained. The rod 6 with the suspenders installed on it with 5- and parts 4 reports a reciprocating movement ensuring the treatment of the surfaces of the part parallel to the axis of the rod 6, while moving the suspensions 5 along the rod

6 is limited. The fraction from the fluidized bed 3 is entrained into the ejector 7 through its windows 8. After the nozzle has flowed out and hit the surface of the part, does it remain in the fluidized bed?

layer and thus used repeatedly, while its loss during processing are eliminated. Metal particles, peeled off as a result of impact from the surface of the part or

from the surfaces of the pellets, removed from the fluidized bed by the fluidizing agent (air) and stretched. are vented (not shown in the drawing) through a cyclone filter,

collecting these particles and cleaning the fluidizing agent (air) before it is discharged into the atmosphere.

An example of a specific use of the invention is the shot blasting of the surface of the screw, detail 50-4605058 of the tractor MTZ-80. According to the attached scheme, the clamping screw is installed in the suspension 5 located on the rod 6i and immersed in the fluidized bed of the fraction with the diameter of pellets O, 63 mm between two ejectors 7, include

supplying air of equal pressure through both ejectors and treating the surface of the part for 1 min, then reducing the pressure of the air supplied to one of the ejectors, while increasing the pressure of the air supplied to the ejector, the part deflecting at an appropriate angle towards the ejector with lower air pressure , wherein

new sprayed surfaces of the strand fall under the jet of shot. The rod with the suspensions and parts is given reciprocating movements (oscillation) to ensure uniform processing of the entire surface of the sheeting prepared for the application of the coating. The processing time and the number of oscillations are determined experimentally.

3 1333546

Claims (1)

The claims of the invention but perpendicular planes, with The method of processing parts is free in the vertical plane with a knee abrasive, in which the parts are ejected by the flows placed in a fluidized bed of abrasive abrasive, which are directed onto the formation — and the abraded part is directed onto it from opposite Ziva, characterized in that the sides of the jet of compressed air, with that, in order to intensify the process, the speed of one jet of the magnification process, the details report back, and the other one reduces simultaneously translational movement in mutual one and the same value.