SU903087A1 - Method of working parts in abrasive fluidised bed - Google Patents

Description

(54) METHOD FOR HANDLING DETAILS IN A JETSLATED LAYER ABRASIVE

one

. The invention relates to abrasive machining of parts and can be applied in mechanical engineering, instrument making and other industries to deburring, rounding edges, cleaning, polishing.

A known method for machining parts in a fluidized abrasive layer, in which the parts report a rotation in a plane located at an angle to the plane of the gas distribution grid, and the angle of the part installation changes during its processing.

When a part rotates around an axis, its opposite sides are alternately processed.

The disadvantages of this method are relatively low productivity and quality. The quality of machining parts from hard-to-machine materials - titanium and heat-resistant alloys.

The purpose of the invention is to improve the quality of processing parts from hard-to-cut materials.

2

The delivered chain is achieved by additionally installing a brush in the working chamber in a plane perpendicular to the plane of rotation of the part, and rotating it in the direction ensuring the capture of the abrasive grains during processing.

The drawing shows the scheme of implementation of the method in a vertical section of the working chamber.

The part to be processed 1 is rotated in a fluidized abrasive layer 2 in the pt-t plane located parallel to or at an angle 01, not equal to 90, to the plane of the gas distribution grid 3 of the working chamber 4.

five

To liquefy the layer of abrasive 2, under the gas distribution grid 3, a stream Q of compressed air is supplied through the air distribution chamber 5. The part to be processed has a side A having burrs.

20 B, to the plane of the gas distribution grid 3.

During the rotation of the workpiece in a fluidized abrasive npoHcxoatiT intern

A strong removal of the burrs B on the side A of the part, as in the abrasive zone located on this side of the part, the abrasive is intensively boiling and renewing, which improves the processing performance.

In contrast, the side B of the part is in the aerodynamic shade of the flow Q of the abrasive air that is fluidized, and therefore the treatment intensity in this zone is much lower due to the absence of abrasive fluidization. The smaller the angle of the axis of inclination of the plane m-tn of rotation of the part 1 to the plane of the gas distribution grid 3, the greater the stagnant zone of the non-liquefied abrasive on the B side of the part and the smaller the removal rate on this side. On the other hand, chamfering on side B begins earlier than on side A of the part where the burrs are first removed and the edges are not rounded off. But by the end of the machining of the part, the rounding radii on its opposite (H) 1x sides crawl at MefjHo are the same, since their shaping from the A side is more intensive. Equalization of the rounding off edges on opposite sides of the part is also achieved by selecting the angle of the inclination angle c, since the removal rate of the metal depends on the magnitude of this angle, which allows in each case depending on the size of the burrs, their strength, etc. - select the angle at which the radii of rounding will be equal.

If extremely large and strong burrs are present on the parts, they are removed with a brush 6 located in the working chamber 4 above the abrasive layer 2, which are rotated in a plane perpendicular to the t-m plane of rotation of the part 1, in the direction of the arrow (О, at which the working The side G of the brush 6 moves towards the exit of the flow Q of fluidizing abrasive air.

When the workpiece is rotated around its axis, the abrasive is thrown by centrifugal forces on the periphery of the part to the brush, which during its rotation picks up, carries the abrasive into the zone of its contact with the part, removing burrs. If the brush is rotated in the npoi-opposite direction, the intensity of the burrs will decrease dramatically, since the abrasive will hardly get into the area between the brush and the part.

The uniformity of processing of both sides of the part - equality of the radii of the rounded edges - is achieved by applying the brush also by choosing the speed of its rotation, material and pressing force to the workpiece. In addition, the uniformity of removal of the allowance along the edges can be adjusted by the ratio of the speeds of rotation of the part and the brush, as well as by measuring the flow of air, a thin abrasive.

The method makes it possible to improve the surface quality of difficult-to-work parts due to the combined treatment with a fluidized abrasive and a rotating brush.

Claims (1)

Invention Formula The method of processing parts in a pseudo-abrasive abrasive layer in the working chamber, in which the part to be machined is reported to rotate in a plane at an angle to the plane of the gas distribution grid, which is changed during processing, characterized in that The working chamber is additionally installed a brush in the plane perpendicular to the plane of rotation of the part, and rotates it in the direction ensuring the capture of abrasive grains during processing weavers. Sources of information taken into consideration during the examination 1. USSR Copyright Certificate No. 736482, cl. B 24 B 31/00, 1978. S-0