SU1379054A1 - Combination tool - Google Patents

Abstract

The invention relates to the field of metalworking and can be used for machining cylindrical surfaces on lathes and hand tools. The purpose of the invention is the expansion of technological capabilities, which is achieved due to the relative position of the two dies. The tool consists of an outer 1 and an inner 2 housing corresponding to) pc1x dies with feather teeth 3 and 4, and the second tooth is displaced axially relative to the teeth of the first die by (n + 1/2), where S is the value displacement, P is the pitch of the dies, and n is the number of turns of the plate required for self-tilting. 2 Il. with i (L

Description

FIG.

The invention relates to the field of metalworking and can be used for machining cylindrical surfaces on lathes and hand tools.

The purpose of the invention is the expansion of technological capabilities by enabling the processing of a cylindrical surface.

The goal is achieved due to the mutual arrangement of the dies with their teeth offset by an amount that ensures the successive formation of a cylindrical surface, while it is possible to handle the cylindrical surface manually and on machines that are not equipped with feed mechanisms.

FIG. 1 shows a tool with a general sectional view; in fig. 2 - the same top view.

The tool contains outer 1 and inner 2 bodies of the corresponding dies installed one into the other. The feather 3 of the first plate is placed between the feathers 4 of the second internal plate. In this case, the feather 4 of the second plate is shifted relative to the feathers 3 of the first plate in the axial direction by one turn and rotated by an angle,

-V 180 ° equal, where m is the total number

m

feathers. This axial angular displacement of the feathers provides a shift of the cutting teeth of the second die relative to the teeth of the first die by one and a half thread pitch.

In the general case, the threads of the dies should be shifted by an amount determined from the ratio

(n +),

where S is the amount of tooth displacement;

P - dies thread pitch; n is the number of threads of the dies needed to self-tamp the tool. The threads on both dies are made identical in pitch. Their profile has the shape of a trapezoid, and the internal diameter is made equal to the average diameter of the triangular thread of the same pitch, which ensures the overlapping of the protrusions of the thread of one die with the hollows of the thread of the second die.

When such a tool is in operation, the first die forms a thread, which ensures the supply of the tool with self-clogging. Since the trapezoidal threads of both dies, when their axial sections are combined, block the gaps between the thread windings and also because the protrusions of the thread of the second die, at the indicated installation of the dies, are located on the same helix with the grooves of the thread of the first die, the second die cuts the thread cut the first die, and forms a smooth cylindrical surface. Undercutting with such a die will be determined by the number of turns needed for self-homing. The tool is removed from the machined surface when it is reversed relative rotation.

Claims (1)

Invention Formula The combined tool, in the case of which the die is threaded, is different, in order to expand technological capabilities by providing the possibility of processing the cylindrical surface, the tool is equipped with a second die installed in the case, the cutting teeth of which are axially displaced relative to the teeth of the first die. value determined by dependency S P p (n +), displacement amount; dies thread pitch; the number of threads of the dies needed for self-drilling. , (rig.1