SU1366301A1 - Floating center - Google Patents

Abstract

The invention relates to the field of machine tools, in particular to the processing of children on turning and grinding machines. The purpose of the invention is to increase accuracy. In case 1, an intermediate support 8 with a window for passing the plunger 5, spring-loaded with springs 9, is mounted on the working cone. on the other hand, with a bevel on a spring-loaded plunger 5. The support 8 is held in the housing 1 by means of a cover i 12.1 Il.

Description

7G GO

with about:

9)

with

one

This invention relates to a machine tool industry, in particular to machining parts on turning and grinding machines.

The aim of the invention is to improve the accuracy

The drawing shows a floating center, an axial section.

In the housing 1 a spring-loaded spring 2 is installed; a working cone 3 with a bevel, a retaining ring 4,

In the bore of the housing 1 coaxially with the working cone 3 is the plunger

5 with a bevel, spring loaded

6 and fixed against rotation, as well as to limit the movement in the axial direction of the screw 7.

In the housing 1, an intermediate support 8 with an opening for passage of the plunger 5, spring-loaded with springs 9, is mounted on the working cone 3;

Floating center works as follows.

In the initial position (prior to the installation of the part), the intermediate support 8 is sprung by springs 9. Before contact with the cover 12, the working cone is also in the forward position until the stop ring 4 contacts the case 1,

The part to be machined is installed on the working cone 3 and moved along arrow A, overcoming the resistance of the spring 2. The butt end of the workpiece contacts the surface B of the intermediate support 8,

At this moment, there is still a gap between the bevel 10 bevel and the bevel on the plunger 5 (conventionally, it was assumed that at this moment the bevel on the working cone 3 is in contact with the bevel 10 facing it.

The presence of the gap is achieved due to the size of the corresponding parts, as well as keeping the plunger 5 in a certain axial position with the help of a screw 7,

e

366301.2

ca 3 with respect to intermediate support 8.

Upon further movement along arrow A, the working cone 3, plunger 5, intermediate support 8 move as a single whole, compressing the springs 2, 6 and 9 until the intermediate support 8 stops against housing 1. The workpiece de-IQ is installed.

At the same time, even with the application of significant cutting forces in the radial direction, the working cone 3 does not move along the arrow A due to the fact that the bevel angle on the plunger 5 is smaller than the self-braking angle, i.e.

where s / is the ram angle of the plunger,

Cf is the friction angle on the inclined surface - at f, 1 (steel pshifovalnye15

surface) tp 5 43 ie oi,

and so the plunger is 25 left.

5 does not move

The center is blocked.

At the end of processing the installed part is removed. Under the action of the springs 2, 6 and 9, the working cone 3, the plunger 5 and the intermediate support 8, respectively, return to their original position. .

Due to the fact that the bevel angle on the working cone is greater than the self-locking angle:

оС X

where oC is the plunger speed,

tp - friction angle on an inclined

surfaces that

Cf, is the friction angle over the cylindrical surface of the working cone when cf cf, 0.1 (the rest of the surface grinding) is not jammed, and the working cone 3 is a sukar, 10 and the working cone 3, under the force of the spring 2 returns to the original position.

Claims (1)

Invention Formula Upon further movement of the machined center, in the case of the part being machined along arrow A, a spring-loaded worker is located There is a gap between the bevel of the 10 Coius bevel and the mechanism of its fixation, about being bevelled on the plunger 5, which occurs with the fact that, with the fixation of the position of the working horse to improve accuracy, the center of the supply is 1366301 wives placed in the bore of a case-mounted perpendicular to the axis in an end support set to the position of the stop of the cracker with beveled the possibility of axial movement by seamen, one of which is intended to be a center, and the fixation mechanism is designed to interact with the said in the form of a plunger located parallel to the plane, and the second - from the center of the plunger with the bevel and the bevel that is different on the working cone.