RU1811993C - Thread-cutting chuck - Google Patents

Abstract

Usage: when machining metals by cutting, namely.. Threading on CNC machines. The housing 1, bearing a tap, is connected to the shank 2. The locking mechanism, including an axial shaft 3, a retainer 4, set balls 5, springs 6, 7, 8, cap 9 serves to ensure a constant departure of the housing 1 from the shaft 2. The rod 3 is screwed the threaded end into the shank 2. The housing 1 is connected to the shank 2 by means of balls 10. Ring 11 prevents the balls 10 from falling out. 5 ill.

Description

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The invention relates to the processing of metals by cutting, namely to threading in non-CNC machines

An object of the invention is to improve thread accuracy by positioning taps during machining on CNC machines.

In FIG. 1 shows a General view of the cartridge assembly; figure 2 - fixing mechanism (the housing in the initial position); in Fig.3 - section aa in Fig.2; figure 4 - locking mechanism (the housing is extended from the shank); in Fig.5 - section BB in Fig.4.

The cartridge is made as follows. A housing 1 carrying a tap is connected to the shank 2 by means of balls 10 and serves to transmit torque from the spindle to the tap. Balls 10 are installed in radial longitudinal grooves 12 and 13, made to a depth of 0.5 diameter of the balls in the housing and shank, respectively. The locking mechanism, including the axial rod 3, the latch 4, the mounting balls 5, springs 6, 7.8. a cap 9 serves to ensure a constant departure of the housing 1 from the shank 2. The rod 3 is screwed into the shank 2 with a threaded end. The ring 11 prevents the balls from falling out. The cap 9 serves to hold the balls 5 in a certain position.

The cartridge works as follows.

When cutting a thread, the body 1 carrying the tap moves backward relative to the shank 2 if the feed of the spindle is greater than the pitch of the thread being cut. Spring

6 is compressed and spring 7 is expanded. Balls 5 are installed in the rod 3 with the bore diameter of the cap.

When reversing, the housing 1 extends from the shank 2 under the action of the spring 6 until the forces of the springs b and 7 are balanced.

If the feed of the spindle is less than the pitch of the cut thread, the housing 1 extends forward relative to the shank 2, spring

7 is compressed, the balls 5 are recessed into the rod 3 by the inner diameter of the housing, pushing back the lock 4, compressing the spring 8. When the 7 and 8 springs are reversed, they are unclenched (Figs. 4 and 5).

The fixing process is carried out as follows. The spring-loaded retainer 4 tends to push the balls 5 out of the holes of the rod 3 by the conical part. The cap 9, put on the rod 3, is pressed against the end by the spring 8. The balls G are clamped on three sides by the cap 9, which prevents them from falling out. Fall inside rod 3 into its radial

holes are prevented by the latch 4, In the future, the mounting balls 5 abut against the end of the housing 1. It is this end that ensures the constant departure of the housing 1 from the shank 2, i.e. precise positioning

tap fixed in the housing. When cutting a new hole (in the presence of a constant departure of the housing 1 from the shank 2), the thread in the product will always be of constant length. As a result, the tap always stops with the latch at the same position, i.e. at the same distance from the product, a program is currently being developed for CNC machine tools for a constant housing extension length with a tap fixed to it.

Technical appraisal and economic advantages in comparison with the base object-cartridge with double compensation for CNC machines (see E.I. Automobile, Togli Tti, 1986, page 15, drawing 02-6163 No. 5043).

By using the invention, a constant tap offset is provided, i.e. precise positioning, improved thread quality and manufacturability of products due to fine tuning of CNC machines,

FORMULA and ZOBRETEN and the Thread-cutting boss including

a shaft, an axially displaceable housing housed therein, an axial rod springing relative to it, characterized in that, in order to increase the accuracy of the thread being machined, the device is equipped with a housing-fixing mechanism including a cap having bores of two diameters and installed in a made in the housing from the side opposite from

the shank, the bore in the girth of the axial rod, a set of balls placed in the bore of the cap of a larger diameter, a retainer having a tapered surface mounted in the bore made in the axial rod, while the cap and retainer are spring-loaded relative to the axial rod, and the rod is rigidly connected to the shank moreover, the latch is placed with the possibility of interaction of the conical surface with a set of balls.