SU1593930A1 - Tool for burnishing - Google Patents

Abstract

The invention relates to metalworking, to hardening and finishing, namely to a tool for smoothing. The purpose of the invention is to increase tool life. A diamond tip 2 is installed in the holder 1, the cylindrical surface 3 is convex and the cylindrical surface 4 is concave and forms a cutting edge 5 at the intersection. The convex surface 3 is formed on both sides of the tool axis 7. The cutting edge 5 at the point 8 of intersection with the tool axis 7 is made tangential to the convex cylindrical surface 3 forming 9. This reduces the temperature, reduces the contact area on the rear surface, and ultimately reduces the temperature. 6 Il.

Description

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The invention relates to metal working, in particular to strengthening and finishing.

The aim of the invention is to increase durability by reducing the temperature in the cutting and smoothing zones and increasing the volume of the cutting wedge.

FIG. 1 shows a smoothing tool, a general view; in fig. 2 is a view A of FIG. one; in fig. 3 is a view B on the diamond tip in FIG. 2; On fip 4 - a diagram of the installation of the diamond tip of the tool relative to the workpiece; in fig. 5 is a sectional view BB in FIG. four; in fig. 6 - section G-Y in FIG. four..

In the tool holder 1, there is a diamond tip 2, bounded by a convex cylindrical surface 3. This surface, being the back surface of the tip 2, when crossing with a concave cylindrical surface 4, which is the front surface, forms a cutting edge 5. Axis 6 of surface 3 intersects under at right angles, the tool axis 7, and the latter crosses the cutting edge 5,

The cutting edge 5 at the point 8 of intersection with the tool axis 7 is made tangent to the convex cylindrical surface 3 that forms 9. The axis 10 of the concave cylindrical surface 4, made with radius r, is shifted beyond the convex cylindrical surface 3 of radius R relative to the b axis by I. This makes it possible to significantly increase the angles of the tip point of the blade (and, therefore, increase the heat sink and reduce the temperature) on the thin-cutting profiling section with point 8 on the edge 5, defined by the formula

/ SN 90 ° -ON -yhj 90 ° - “N

-arctg

sine

(r-o-

VR2- (r- |) 2J

, mind - back and front angles in the normal section, respectively:

r is the concave front radius

surface 4;

I is the distance between axes 6 and 10 of surfaces 3 and 4, respectively; в is the angle between axes 6 and 10; R-radius of the convex back surface 3.

To facilitate chip removal, a sharp increase in the sharpening angle from the profiling edge to the cutting section is required, which is achieved by crossing the axis 10 of the concave front surface 4 to the axis 6 of the convex surface 3 of the tip 2 at an acute angle. A convex cylindrical rear surface 3 is formed on both sides of the tool axis 7, forming separated parts; the smoothing part with the contact spot 11 (shown by dotted dotted line), located above and to the right of point 8, and

the cutting part 12 with an edge 5 located below and to the left of this point (Fig. 4).

The tool is tuned to the best smoothing and cutting conditions by displacing the tool axis 7 with

point 8, located on the edge, downward relative to the axis 13 of the part by the value of q and turning by angle L of the crossing of the axis b of the cylindrical surface 3 relative to the axis 13 of the part. The adjusted position of the tool holder 1 is fixed in the tool holder 14. A positive effect is achieved in the proposed tool with the ratio of the radii of its convex and concave surfaces r R I.

To expand the technological capabilities for processing materials of different hardness, the recommended parameter ratios are developed, which are listed in Table. 1. The regrinding of the proposed smoothing tool with a cutting edge is performed along the front concave cylindrical surface 4, after which the tip 2 rotates in the holder 1 around the axis b of the surface 3 to

coincide point 8 of contact of the cutting edge 5 and forming 9 with the axis 7 of the tool, and then fixed with a screw. Such regrinding and adjustment of the tool allow periodically updating both the cutting and

and smoothing its parts.

The processes of cutting and smoothing with the proposed tool should be performed using coolant — spun oil, sulfofresol

or I-20A oils.

In tab. 2 shows the geometric parameters (degrees) of the proposed and known tools.

Claims (1)

The implementation of the proposed tool according to the above parameters reduces wear and increases its durability. Claims A smoothing tool containing a diamond tip, having a convex cylindrical surface of a larger radius, whose axis is at right angles to the tool axis, and a concave cylindrical surface of a smaller radius, forming a cutting edge that intersects the tool axis and the concave axis at the intersection. the cylindrical surface is displaced relative to the convex cylindrical surface, which is characterized by the fact that increasing durability by lowering the temperature in the cutting zones and smoothing and increasing the volume of the cutting wedge, the tip has an additional convex cylindrical surface symmetrically with the first relative to the tool axis, and the cutting edge at the point of intersection with the latter is tangentially to the forming convex cylindrical surface. Table 1 Note. t is the depth of cut. table 2 Bu & S FIG. 8 S shattered 5 6 1 YY