SU1313568A1 - Polyhedral unturned plate - Google Patents

Abstract

The invention relates to metal working, in particular to collective cutters for high-speed and ultra-high-speed cutting of metals. The purpose of the invention, which is to increase the wear resistance of the cutting insert, is achieved by creating optimal (hydrodynamic) shapes of its cutting edges. The cutting plate has side faces 1, front 2 and back 3 surfaces with ribbons at the peaks, each of which is made with a wave-like topographic relief in the form of harmonics, described by the relief functions of Bessel. The rake angle, as it moves away from the tip of the cutting edge at the width of its ribbon, takes on different values, from negative to positive. The section of the ribbon with a negative angle is a reinforcing chamfer. The protrusions and depressions are convergent in the direction towards the vertices of the faces, and divergent topographic reliefs towards the normal planes of sector symmetry in the direction of their center. 1 3.p. f-ly, 9 ill. c & (L Fuu .;

Description

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The invention relates to metal working, in particular to collective cutters for high-speed and ultra-high-speed cutting of metals.

The purpose of the invention is to increase the wear resistance of the cutting plate by creating about the optimal (hydrodynamic) forms of its cutting edges.

FIG. 1 shows a cutting plate, axonometric; in fig. 2 - the same, top view; in fig. 3-8 — equally spaced cross-sections of the plate in the radially normal direction; in fig. 9 - radial-normal section of the plate.

The cutting plate has side edges 1 ,. front 2 and rear 3 surfaces, with ribbons at the top, each of which is made with a wavy topographic relief in the form of harmonics, described by the relief functions of Bessel.

The displacement of profiles in the radial-normal direction in each sector of the faces and between their normal planes of 1-1 symmetry form a wavy relief with variable parameters of height N, -Ng and its displacement 6-5, along the front surface, and similarly on the back surface .

The cutting edge of each facet is made along the radius R; its maximum value in the normal plane of II symmetry deviates from the straightness, corresponds to the value of σ and depends on the value of R, while the magnitude of the displacement с, -004 in each radial-normal section -1-1 corresponds to the maximum value in accordance with the value of the radius Dmosh These values also correspond to the values of the displacements (x) of the bases of the edges of the cutting insert. As a result of a change in the radial-normal and transverse sections of the profile of the working surfaces of the plate, a wavy topographic relief is formed with the convergence (convergence) of the waves along the axis of symmetry at the vertices of the faces and the divergence (diverter 682

waves) to symmetry planes in a radial-normal section I – I, which, in addition to the special hydrodynamic properties of cutting blades,

provides their increased rigidity and vibration in the process of high-speed cutting.

Rake angle J as you move away from the tip of the cutting edge in width

its ribbons take on different values - from negative with zero crossing to positive. The section H of the ribbon with a negative angle, which is a reinforcing bevel,

for high-speed cutting, it is chosen in the range of 0.4-0.8 mm depending on the mechanical properties of the material being processed. The same width corresponds to the ribbon on the back

facets. Rear angle on choose depending on the material being processed.

Claims (2)

1. A multi-faceted non-rotating plate, mainly for high-speed and super-speed metal cutting, contains side edges made with a radius protrusion that passes into the ribbon at the top of the cutting edge, which is designed to increase wear resistance for each protrusion. the sectors of the plate face are filled with intersecting cavities forming in the radially normal and transverse sections of the sectors the topographic relief in the form of harmonics described by the Bessel’s relief functions, and the edges are made along the front and rear surfaces along a radius that is conjugate to the radius parts of the top: in edges. 2. Plate pop. 1, which differs from the fact that the protrusions and depressions form convergent towards the vertices of the faces and divergent topographic rel-efs to the normal planes of sector symmetry in the direction of their center. tpue fig.b fie.Z