SU1696161A1 - Chuck for tap borers - Google Patents

Abstract

The invention relates to the field of mechanical assembly production and can be used to form internal threads and assemble threaded connections. The purpose of the invention is to improve the quality of thread cutting due to the axial orientation of the tool in the initial period of thread cutting. The cartridge has a cylindrical body 1 with a shank 2. A central suspension 4 is installed in the body 1, containing cardan hinges 5, a splined pair 6, a male cone 7, rigidly connected to the meter and a holder 8 carrying the tool 9. The sleeve with the cone 10 is made at the same time with a movable ferrule of a planar ball pair 11. mounted in a sleeve 12, which moves axially inside the housing up to the stops 13 by the action of a spring 14. The central suspension is pressed before the cones are closed by the spring 15. Zil.

Description

The invention relates to the field of mechanical assembly production and can be used to form internal threads and assemble threaded connections.

The purpose of the invention is to improve the quality of thread cutting due to axial orientation of the tool in the initial period of thread cutting.

FIG. 1 shows the design of the cartridge; in fig. 2 - diagram of the cartridge at the beginning of the operating cycle; in fig. 3 - diagram of the cartridge at the end of the operating cycle.

The cartridge has a cylindrical body 1 with a shank 2 fasteners in the spindle 3 of the machine. In case 1, a central suspension 4 is installed, containing cardan hinges 5 of the angular compensation mechanism and a splined pair 6 located between the hinges, covered by a cone 7, rigidly connected to the taper holder 8,

tool carrier 9 or fastener.

A sleeve with a cone 10 is integral with a movable yoke of a planar ball pair 11 mounted in a sleeve 12, which moves axially inside the body to the stops 13 of the lower collar by the action of a spring 14. The central suspension presses up until the cones are closed by the return spring 15 located between collar 16 of the body and slotted sleeve 17 of the lower hinge of the cardan mechanism.

The cartridge works as follows.

In the initial position, the central suspension is coupled with the housing 1 by the cones 7 and 10 in such a way that the tap holder 8 has the possibility of only a radial displacement within the permissible orientation error. The closure of the cones is produced by the spring 15. The sleeve 12 prist C

about

4D

ON (

pressed to the stop 13 by the spring 14. From the initial position, the cartridge is fed by the spindle head 18 to the touch with the technological stop 19,

The headstock with the chuck stops at the stop, and the tool or fastener 9 abuts against the end of the hole with the force required to enter the tool into the hole. This force is determined by the stiffness and magnitude of the compression of the spring 14. The condition for adjusting the technological system at the initial coupling stage is

L-LENIT +

where L is the stroke length of the spindle head up to the stop;

ITC is the height of the initial position of the stud;

h is the amount of compression of the spring 14 to provide the necessary force for the tool to enter;

PO is the axial force sufficient for the tool to enter the hole;

Spr - spring stiffness 14.

After being mounted on the anvil 19, the spindle is turned on and the tool starts machining the hole. As it is screwed in, it deepens, the spring 14 expands by the amount of And, and the sleeve 12 stands on the support 13, and the lower part of the central suspension begins to move downward, opening the cone 7 and 10 and compressing the spring 15 by an amount equal to the depth of the tool

G

I

where 12 is the length of the spring 15 in the initial position of the cartridge;

l2c - the length of the spring 15 in the final position of the tool.

Once the desired machining depth has been reached, the spindle is reversed and the tool begins to unscrew from the hole. In the case of a deforming fastener, the tool tip is twisted from the nut end and returned to its original position by the spring 15. The spindle head moves upwards from the stop 19, and the spindle stops.

Claims (1)

Invention Formula A cartridge for taps, comprising a housing with a shank, a tap holder with an outer conical surface, a two-link driveline, one link of which is associated with the tap holder, and the other with a housing, and two springs, characterized in that, in order to improve threading accuracy the cartridge is provided with a sleeve installed in the housing with the possibility of axial movement, a sleeve with an internal conical surface installed in the sleeve with the possibility of radial movement and simultaneous interaction with the conical surface An awl of the tarp holder is by means of ball bearings inserted into the sleeve, one spring being installed between the sleeve and the protrusion made on the inner surface of the body, and the other between the protrusion and the lower link of the universal joint, with the tapered surface of the magnetic pole being inclined towards the body stem. Schi 2 Figz