SU1181831A1 - Thermal deburring apparatus - Google Patents

Description

The invention relates to mechanical engineering, in particular to the processing of materials in an environment of heated reactive gases for burning burrs and other defects. five

The purpose of the invention is to improve the quality of processing by uniformly heating all surfaces to be processed and fixing parts in a predetermined position, as well as reducing the cost of processing by combining operations to remove parts from the chamber and clean its walls.

For this purpose, in an installation for thermal * 5 · deburring, containing a frame with a working chamber on which a movable table for installing parts, intake and exhaust valves and an ignition plug are mounted, a horizontally arranged movable corrugated perforated plate 20 is provided inside the chamber. resting on a spring fixed on the end cover of the chamber, and on 25

The inner surface of the chamber at its open end has a cylindrical protrusion to limit the movement of said plate, while the table cover is made hollow with a corrugated-perforated supporting surface. The diameter of the corrugated plate is equal to the inner diameter of the working chamber.

The positive effect is achieved. 35

the fact that the ignition zone in the chamber is separated from the processing zone of products by a corrugated perforated obstacle, which allows the combustion process to be organized more uniformly, and therefore, create a uniform heat flow around the part. The same. contributes to the basing and fixing parts on the protrusions of the corrugations of the bottom and the plates by points or lines. 45

2

Due to the mechanical fixation of products both in the process of their submission to the chamber, and in the process of processing, a marriage is prevented due to movements and collisions of parts under the influence of detonation waves. In addition, the presence of mechanical fixation allows you to pre-orient the parts in the chamber in an optimal way based on the technical conditions for processing,

And finally, the presence of a mechanical scraper, automatically triggered after each successive cycle, ensures the cleaning of the walls of the working chamber after each cycle from contamination.

FIG. 1 shows the proposed installation, a longitudinal section; in fig. 2 - the same in the working position; Fig, 3 is a view of the table supporting surface.

On the base 1, cylinder 2 is rigidly fixed, carrier table 3 with workpiece 4, as well as working chamber 5 with inlet valve 6, spark plug 7 and exhaust valve 8. Inside the chamber, a compression spring 9 is fixed to its end cover, supporting plate 10, resting on the cylindrical protrusion 11, made on the inner wall of the chamber at its open end. The plate 10 is a corrugated plate with through holes 12, the outer bead 13 of which has a diameter equal to essentially the inner diameter of the working chamber.

In the upper part of the cover of the table 3 is made of a hollow protrusion 14, the end of which is also corrugated and has through holes 15 for the passage of the combustible mixture from the chamber into the cavity of this protrusion. The location of the holes in the end of the hollow protrusion 3 1181831 4

PA 14 of table 3 is shown in FIG. 3, the plate 10 has a similar design. For sealing the chamber, an elastic sealing ring 16 is provided. The machined part 5 is indicated with 17.

The installation works as follows.

 The workpiece 4 is mounted on the table top 3, after which ιθ by means of pneumatic cylinder 2 the table with the part moves up

(Fig. 1). During this upward movement, part 4 contacts the plate, 10 and pneumatic cylinder 2, overcoming the resistance of spring 9, sets the bottom in the working position (Fig. 2), while sealing the chamber by means of seal 16. Thus, in the process of moving the table 3 upwards It prevents the workpiece 4 from shifting from the initial position, which may occur due to the uneven movement speed of the piston rod 2 of the pneumatic cylinder 2 and at its abrupt stop at the end of the stroke.

This is achieved by fixing parts 4 on the table 3 with a plate THEN by means of a spring 9.

After lifting the table 3 upwards, a combustible mixture flows through the inlet valve 6, which, passing through the openings 12 in the plate 10, as well as through the openings 15, in the bearing surface of the projection 14 of the standing-35 3, washes the part 4 evenly, and contributes and corrugations on the plate and bottom, i.e. access of the hot mixture in such a basing of the parts will be more uniform, ⁴⁰

than if the part was set flat on a flat bottom. When the mixture is ignited by means of a spark plug 7 in the chamber, the pressure and temperature increase and the removal of burrs and other defects on the part 17 is ensured.

In this installation, the combustion process of the mixture is more uniform, since the influence of wave phenomena is weakened, 50 The mixture initially lights up in the volume of the chamber adjacent to the spark plug, i.e. in the area between the top end cap and plate 10, then the flame spreads in the remaining 55 volume of the chamber, but since the flame front overcomes the corrugated perforated barrier (plate 10), this leads to equalization of the mixture temperature throughout the chamber volume, and hence around the part. The mixture through the corrugations and holes in the plate 10 and in the end of the protrusion 14 of the bottom also flows freely to the upper and lower planes of parts. that, in general, provides a more uniform burr burning, and hence a higher quality of processing.

At the first moment of ignition, the detonation wave, acting on the plate 10, exerts an additional force (along with the action of the spring 9) of pressing the part 17 against the bottom, which ensures the immobility of the product at the moment of treatment, i.e. prevents blows of parts against each other and against the walls of the chamber. This eliminates the appearance of a marriage that took place in known devices, where the details were not fixed in the chamber.

At the time of completion of processing, the exhaust valve 8 is opened, and the products of combustion are removed from the installation. After that, cylinder 2 is turned on for cleaning the rod, and table 3, together with the machined part 17, is lowered down to the unloading position. Simultaneously with the downward movement of the table 3 in the same direction, under the action of the spring 9, the plate 10 moves, pressing the part 17 to the table. At the same time, the flange 13 of the plate U, adjacent to the inner wall of the working chamber, mechanically cleans its surface from soot, oxides of the part material, metal particles and other contaminants that fall on the chamber walls after processing the next part and burning the gas-oxygen mixture.

After the table is set to its original \ position, further movement of the tat: rekly 10 down is limited to the cylindrical protrusion 11, and the contaminants removed from the chamber walls by the collar 13 and trapped on the table are removed by compressed air or other means.

Thus, after each working cycle, the inner walls of the working chamber are automatically cleaned of impurities, and the next products are processed in the cleaned chamber.

After loading the table 3 regular

procurement installation work cycle

repeats ..

.1181831

FIG. 2

Fig.Z

Claims (1)

one . INSTALLATION FOR THERMAL REMOVAL OF THE 'BUGERS', containing a working chamber, with a movable table for installation of parts, hermetically closing the chamber, characterized in that, in order to improve the quality of processing by uniformly heating all surfaces and fixing the parts in a predetermined position, it is provided with a corrugated-perforated a thin-walled plate installed inside the chamber and spring-loaded with respect to its wall in the direction of movement of the table, and the table cover is made hollow with corrugated-perforated support surface. L t •but ¹ - ten eleven zi „„ 1181831 Fig-1. one 1181831 2. Installation of pop, 1, characterized in that, in order to reduce the cost of processing by combining the operations of removing parts from the chamber and mechanical cleaning its walls, the outer diameter of the corrugated-perforated thin-walled plate is equal to the inner diameter of the working chamber. one