RU11128U1 - DEVICE FOR JET AND ABRASIVE PROCESSING OF BODIES OF ROTATION - Google Patents

Abstract

A device for jet-abrasive treatment of bodies of revolution, comprising a working chamber with a mounting place for a rotating workpiece, in the lower part of which a flat feed nozzle is mounted, containing a cylindrical element for implementing the Coanda effect, characterized in that a pipe is installed on the wall of the flat feeding nozzle opposite to the cylindrical element for feeding into the feed stream under the action of its own weight returnable abrasive.

Description

Device for jet-abrasive boot of bodies of revolution

The utility model relates to the field of engineering technology, mainly to the technology of finish processing of parts such as bodies of rotation of precision pairs.

The purpose of the device is the finishing of plungers and other precision pairs to create a microrelief on them with a large oil capacity 1., P.98. The second purpose of the device is surface preparation for finishing anti-friction non-abrasive treatment (FABO) - rubbing friction surfaces with brass (brass plating). All things being equal, brass particles have better adhesion to the steel surface if they are removed from the brass rod in the form of very fine chips. Surfaces having crater-like and grater microroughnesses have this property; obtained by abrasive blasting on the device below.

As an analogue, a device for hardening parts of a.s. No. 907949, B24s 9/08

The device comprises a housing and a flow splitter mounted coaxially to the housing, as well as a plug that provides hole processing with a constant number of balls circulating in a closed channel. The device also contains a sleeve of variable cross-section, along the periphery of which longitudinal channels for removing compressed air are made, a fitting for introducing compressed air is located on the axis.

The disadvantage of this device is that it can not work on an abrasive of medium size with a particle size of 10 - 50 microns in view of the design features, designed to work with balls. Abrasive in view of its smaller size and density, if used in the device described in the analogue, it will fly out along with the exhaust air through the peripheral channels of a sleeve of variable cross section.

As a prototype, a device for abrasive processing of parts, and.with. No. 1098775, B 24 C 3/22, B.I. No. 29. 1984 The device comprises a working chamber, in the side wall of which a feed nozzle is mounted. The device is also equipped with a cylindrical element mounted with a gap to the base of the working chamber in such a way that the axis of the nozzle is parallel to the tangent to the generatrix of the cylindrical element. The purpose of the cylindrical element is to separate the air stream from the abrasive. The air stream adheres to the cylindrical element, bends around it and goes beyond the working chamber, and the abrasive dispersed by the air stream rushes into the working chamber and processes the part.

The disadvantage of the prototype is that in it the abrasive does not circulate in a vicious circle, which reduces the intensity of the process.

MPKV24sZ / 22

The purpose of the utility model is to increase the intensity of the processing of parts such as bodies of revolution by providing a closed cycle of movement of the abrasive in the working chamber.

The goal is achieved by the fact that one wall of the flat feed nozzle is equipped with a cylindrical element that implements the Coanda effect and deflects the feed stream into the acceleration channel, and on the opposite (relative to the cylindrical element) side there is a pipe for supplying the feed stream under the influence of its own weight of the return abrasive from working area.

The essence of the utility model is illustrated in the drawing. In FIG. shows a diagram of a device for jet-abrasive processing of bodies of revolution. The device comprises a feed nozzle 1 connected to a sector of a cylindrical element 2 that implements the Coanda effect, a channel 3 for moving an air-abrasive mixture containing abrasive grains 4. The walls of channel 3 end with a seal 5 that interacts with the workpiece 6, part 6 rotates as shown by the arrow on figure; the baffle 7 also has a seal 5. The baffle 7 and the walls of the working chamber 8 form an exhaust nozzle 9 for discharging exhaust air. Inside the working chamber there is a separation wall 11. The pipe 12 is designed to supply a return abrasive in the jet feed nozzle. Channel 10 is designed to load the device with an abrasive, (shown by arrow A). In the side wall of the working chamber there is a rotary shutter 13, designed to unload the abrasive after the end of the workpiece (arrow B). The damper 13 has two positions, the position of the damper for unloading is shown in dotted form in the figure. The nozzle 14 is intended for additional air supply to the channel 3 to exclude the interaction of the abrasive with the side wall of the channel 3.

A device for jet-abrasive processing of bodies of revolution works as follows. Part 6 is installed in the operating position and is driven by a drive (not shown in the figure). Compressed air with a pressure of Po is supplied to nozzles 1 and 14. For a sufficiently noticeable effect on the part, it is necessary that the supply pressure be at least 1 bar. An abrasive is loaded into channel 10, which, through the nozzle 12, under the influence of its own weight and ejection of a power stream enters the air supply stream, the air stream flows with abrasive onto cylin; the specific element 2 adheres to it and deviates into channel 3. Nozzle 3, where the feed pressure PO is supplied, it allows to prevent the impact of abrasive on the wall of the channel 3, in addition, the braking of particles when they touch the wall of the channel 3 is excluded. The supply pressure to the nozzle 14 also allows a more uniform particles when they are approaching the surface of the workpiece. Particles of abrasive 4, having dispersed in channel 3, hit the surface of part 6. To prevent the abrasive particles from flying out into the gaps between part 6 and the working chamber, channel 3 ends with a seal 5, the same seal is also on the partition 7. Particles of abrasive 4, impacting the surface of part 6 bounces away from it as shown in the figure. Small particles of abrasive that have formed

when crushing larger particles, they are picked up by a stream of exhaust air and rush into channel 9 with it. To catch them, the device is equipped with a filter system for exhaust air (not shown in the figure). Large particles of abrasive under the influence of their own weight enter the pipe 12 and from there again into the nozzle 3. Then the cycle repeats. After the processing of the part 6, the shutter 13 is fully turned, as shown in the figure, and the abrasive is poured out of the working chamber, as shown by arrow B into the container (not shown in the figure).

Claims (1)

A device for jet-abrasive treatment of bodies of revolution, comprising a working chamber with a mounting place for a rotating workpiece, in the lower part of which a flat feed nozzle is mounted, containing a cylindrical element for realizing the Coanda effect, characterized in that a pipe is installed on the wall of the flat feeding nozzle opposite to the cylindrical element for feeding into the feed stream under the action of its own weight returnable abrasive.