SU1593794A1 - Cutting tool - Google Patents

Abstract

The invention relates to metal working, in particular to a cutting tool with mechanical fastening of polyhedral plates. The aim of the invention is to increase the rigidity of the mount and the manufacturability of the structure by increasing the contact area between the recess wall in the holder and the conical surface of the finger. The tool contains a holder with a socket in which a finger is installed. The finger is screwed into its threaded hole with its threaded end. Between the head clamping plate and the threaded part on the finger there is a conical surface, which is located in the sample in the form of a cylindrical hole, the axis of which is parallel to the generator of the conical surface of the finger. The diameter of the cylindrical hole is made from the condition that, in a section perpendicular to the axis of the threaded hole, it forms an ellipse, in which the curve of the average values of the radii of points adjacent to the intersection point of the major semiaxis is approximated with the circumference of the finger's conical surface. 2 Il.

Description

The invention relates to metal working, in particular, to designs of cutting tools with mechanical fastening of multifaceted plates.

The aim of the invention is to increase the rigidity of the mount and the manufacturability of the structure due to the increase in the contact area between the recess wall in the holder and the conical surface of the finger.

FIG. 1 shows the plate mounting unit, section; in fig. 2 - section AA

in fig. one.

The tool contains a holder 1 in which a finger 2 is installed, screwed with its threaded section 3 into the threaded hole 4 of the holder 1. Between the head 5 clamping plate 6 and the threaded section 3 on the finger there is a tapered surface 7, which is located in a sample made in the holder 1 in the form of a cylindrical bore 8, the axis of which is parallel to the conic surface of the finger 2. The diameter of the cylindrical bore 8 is provided that in the section perpendicular to the axis of the threaded hole 4, it forms an ellipse, in which the curve of average values of the radii of points adjacent to the intersection point of the major semiaxis a-a is approximated with the circle of the largest diameter of the conical surface of the finger. This condition is met by fulfilling the diameter in accordance with the chosen dependency.

SP

with

SAE

CO 4

.0

26

D.

J cosVl-cos-g-) cosa (l-cos-)

This relationship for choosing the diameter Dy is obtained as follows.

at the corner

In the Ellipse equation of the semi-axis

 B. 2cos "i and

To provide a more accurate fit (approximation) of the HSIK-circle with a larger diameter of the conical surface of a finger with an inclined surface of a cylindrical hole (ellipse), three points are selected on the latter, one of the points on the larger axis of the ellipse, and two , selected on the basis of the angle of contact of the conical surface of the finger with a cylindrical hole (Fig. 2), which is 60-90 °.

The circumference of the largest diameter of the cone of a finger should pass through these three points.

The coordinates of the points are determined by

 .sin | -;

Vjir

Uz -1 .sinf; Y, 0; Xf f. - 2cc5o (

Substituting these coordinates into the Ellipse equation, we obtain a mathematical relationship connecting /, 9, a and Dy.

When screwing in a finger, its conical surface contacts with its shape, it and a part of a circle with the surface of a cylindrical hole. 8, moves the head 5 in the axial and radial directions and thereby clamps the plate in the holder pocket.

The presence of contact over the generatrix of the conical surface and the circumference increases the rigidity of the plate attachment unit and reduces the percentage of generation of rubbing surfaces, which contributes to an increase in the Durability and reliability of the design.

Sampling in the form of an inclined cylindrical hole eliminates the need for an additional notch.

to allow the conical surface of the finger to move perpendicular to the axis of the threaded hole of the holder. These advantages provide the feasibility of such fastening, for example, on prefabricated cutters when processing various materials.

Claims (1)

Invention Formula A cutting tool comprising a holder, in the slot of which a replaceable multi-faceted plate is installed with a central hole, the surface of which is intended to interact with the head of a finger fixed in the threaded hole of the holder having between the said head and the thread at the end a conical surface intended to interact with the surface recess on the holder, characterized in that, in order to increase the rigidity of the mount and the manufacturability of the structure by increasing the contact area between st The recess in the holder and the conical surface of the finger, the recess is made in the form of a cylindrical hole, the axis of which is parallel to the forming conical surface of the finger, and its diameter Dy is chosen from the relation L - a (1-cos -) + sin    / h in ld cosa (r -cos | -) where R is the largest radius of the conical finger surfaces; a is the angle of the conic surface of the finger; 9 - the contact angle of the conical surface of a finger with a cylindrical hole, which is chosen from the limit of 60-90 °.