SU848312A1 - Method of working articles in fluidized abrasive - Google Patents

Description

I

The invention relates to the abrasive treatment of parts in a fluidized environment, for example, deburring, rounding edges, cleaning surfaces, etc., and can be applied in mechanical engineering and instrument making.

Devices for processing parts in a fluidized abrasive are known, comprising a working chamber with an abrasive and a distribution grid, as well as an air supply chamber. The parts to be machined are mounted on rotating holders T. A disadvantage of the device is that for processing small parts such as washers, inserts, dowels, etc. it is inefficient, cumbersome and does not provide the necessary accuracy, since only a few parts fixed in holders, which also create a disturbance and shaded zones in the fluidized bed, can be processed on such an installation.

The purpose of the invention is to increase the productivity and quality of machining parts.

This goal is achieved by the fact that the device is equipped with a pair of electromagnets with a control device, one of which is installed under the distribution grille in the air supply chamber, and the second is above the fluidized bed of abrasive at the outlet of the working chamber, while the device is equipped with two restrictive grids, one of which located in the layer of abrasive and at the distribution grid, and the second - above the fluidized bed of abrasive. The electromagnet, installed under the distribution grid in the air supply chamber, is located below the air supply pipe.

The drawing shows a diagram of the device.

Claims (2)

In the working chamber 1, made of a non-magnetic material, in a fluidized abrasive 2, workpieces 3 are placed, the oscillating motion of which is communicated by a pair of electromagnets 4 and 5 and periodically turned on by the switch 6 The oscillation of part 3 is limited by grids 7 and 8, the size of cells which is smaller than the size of the parts to be processed. To ensure fluidization, a distribution grid 9 and an air supply chamber 10 are installed at the bottom of the working chamber 1, moreover, in order to avoid disturbing the air flow in the air opodayuschey chamber magnitotsrovod electromagnet 5 is arranged n the present air supply pipe 11, The apparatus operates as follows. Air passage through the air inlet chamber 10 and the distributor. the net grating 9 causes the abrasive 2 to be suspended. Parts 3, with electromagnets 4 and 5 turned off, are deposited on the lower elastic grid 8, which prevents shocks or deformation of the distribution grid 9 when parts 3 touch it. When the electromagnet 4 is turned on by switch 6 Details 3 are attracted to it and go upwards, the passage through the fluidized abrasive, which produces their processing. When the parts fit the surface of the fluidized bed or restrictive grid 7 by switch 6, the electromagnet 4 is turned off and the lower electromagnet 5 is turned on. The parts are shaken, rotated and under pressure of attraction of the lower electromagnet 5 go down. When the parts fit the lower grid B, switch 6 turns off the electromagnet 5 and turns on the electromagnet 4. Then the cycle repeats. Grid 7, installed over the fluidized bed, prevents the oscillation of parts 3 from oscillation of parts through the output the channel together with the air and from impacts on the magnetic circuit of the electromagnet 4. By adjusting the oscillation amplitude of parts 3 electromagnet 4 and 5 and limiting their progress by grids 7 and 8, the parts were in the most active fluidizing zone all the time Enriched. 4 The magnitude of the oscillation amplitude is chosen empirically depending on the height of the fluidized bed of abrasive and the weight of the parts. The number of workpieces is limited only by the volume of the working chamber. Moreover, the parts are rotated in the fluidized bed by the action of electromagnetic fields, which allows all parts of the surface of the part to be processed qualitatively, i.e. processing quality is improved. The device also allows abrasive machining of parts even with one upper electromagnet 4 in operation. In this case, the parts rise up under the action of electromagnet 4, and go down to grid 8 under the action of gravitational forces. But in this case, the productivity of abrasive processing somewhat decreases. The proposed device for abrasive machining of parts, mainly small, is simpler than the known ones and allows for improved productivity and quality of processing. Claim 1. A device for machining parts in a fluidized abrasive, containing a working chamber with an abrasive and a distribution grid, as well as an air supply chamber, characterized in that it is equipped with a pair of electromagnets with a control device, which is installed under the distribution grid in the air supply chamber, and the second - above the fluidized bed of abrasive at the exit of the working chamber, while the device is equipped with two restrictive grids, one of which is located in the layer of abrasive and distribution grid, and the second is above the fluidized layer of abrasive, 2. A device according to claim I, characterized in that the electromagnet, installed under the distribution grid in the air supply chamber, is located below the air supply pipe. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 534344, cl. B 24 B 31/00, 1976, ShZh-mig / 2 3 Hauler