SU1248755A1 - Method of surface working of articles - Google Patents

Description

The invention relates to mechanical engineering: it can also be used for strengthening surface treatment of parts having sharp edges, for example cutting tools.

. C (5 of the invention - improving the quality of processing a product with sharp edges due to ustramelti, their dulling.

An image of a device for carrying out the proposed method, obsch; in fig. 2 is a cross section of L-A in FIG. ; in fig. 3 - marginal polka-ze ball of relatively sharp edge of the part.

The method is as follows.

in a way.

When generator 1 is driven in, electromechanical transducers 2 excite oscillations of waveguides 3. Under the action of oscillations of the waveguide ends, balls 4 communicate intense chaotic movement in the working volume 5. Strike the surface of the (workpiece 6) roller , balls 4 strengthen it. The rotary cutter 6 is said to have a rotary joint, which achieves evenness of the processing of its entire working surface. Zaitsitny element 7, which is complete in the form of a wedge, does not allow the balls 4 to strike directly on the edge of the underlying edge 8, thereby eliminating it. blunting and chipping

When machining hard materials: (for example, tool steel P18) due to balls hitting directly on the sharp (cutting) edge of a machining defect - chamfering. As practice has shown, in order to avoid chipping, it is necessary that the extreme points of the blows; sha) be separated from the edge of the product at a distance no closer than (0.10 IP

and H . ,

The thickening of the oryx, the distance from the sharp edge from part to the edge of the wedge 7 is defined by the expression:

“(,, f. (,)

where f is the radius of the ball;

H - the angle of the sharp edge of the workpiece; S wedge angle.

The value to ensure the specified displacement of the points of impact of the ball

five

12487552

cov from elementary transformations is chosen from

..r (0,1.0.2) .R.).

4-7 tg

.,. () To ensure the displacement of the boundary

impact points by the value of d (0.1 - 0.2) R, it is necessary to increase the distance by the value of d l, + dR

(Fig. 2). ,

With this, h-u sin. -,:

uf h

9 a

After elementary transformations, we obtain expression (2), a substantiated range of magnitude variation.

Hence the condition for choosing a value — the distance from the sharp edge of the part to the edge of the wedge.

.

you

rSih

R

Example. For ultrasonic hardening of the cutting edge of roller rotary cutters, a roller with a diameter of 130 mm and a cutting edge angle of 70 ° is processed with balls with a diameter of 2 mm.

The average distance from the machined edge to the surface of the oscillating waveguide is 10-15 mm, the amplitude of oscillation is 15 µm. When machining without a protective element, there are s with a cutting edge, leading to the ear / quality of the cut surface and a decrease in its durability. When using a wedge with a top angle of 60 °, good processing quality is obtained. The distance from the edge of the wedge to the cutting edge is 1 mm.

The proposed method allows to improve the quality of surface hardening treatment of products having sharp edges, for example, a cutting tool. As a result, it increases resistance to cutting tools (by an average of 30%) and it is possible to use non-deficient materials instead of critical ones, for example, tungsten-free steels instead of fast-cutting.

Fi8.1

A rotated

nat.2

7

Fiz.Z

Claims (1)

METHOD OF SURFACE PROCESSING OF PARTS, mainly ultrasonic, in which a protective element is placed in front of the workpiece and moving balls are applied to the surface to be treated, characterized in that, in order to improve the quality of processing parts with sharp edges, the protective element is made in the form of a wedge and has its sharp edge towards the sharp edge of the part, while the workpiece and the wedge are placed symmetrically to the plane passing through their sharp edges, and the distance between the sharp edges mi wedge and the component is determined from the relation / h ³ h * fiRisin - s, _h -4) 2 February where ^Λ R - radius of the balls; ^ψ ι ^{and _ ugl OST} R ^bK edges respectively of the workpiece and the wedge. SU „, 1248755