SU1291313A1 - Thread cutting head - Google Patents

Abstract

The invention relates to metalworking and can be used for cutting internal threads on CNC machines and lathes. The purpose of the invention is an increase in productivity, which is achieved by automating the process of retooling the head, the possibility of its use on CNC machines with performance as thread-cutting operations f2 .1 (L to with

Description

neither, nor boring holes. Threading: the head consists of the body 1, in which with the help of the splines 2 the ring 3 is fixed with the axles 4, carrying the disk cutting elements 5 and the gears 6. The wheels 6 are connected

one

The invention relates to metalworking and dp for cutting internal threads on lathes and on a CNC machine tool can be used.

The purpose of the invention is to increase productivity by automating the head changeover process, the possibility of its use on CNC machines with the performance of threading operations, and bore holes.

FIG. 1 shows the thread head, general view; in fig. 2 is the same view from the side of the disk cutting elements in FIG. one; in fig. 3 - electromagnetic brake, cut.

The threading head consists of a body 1 in which a ring 3 is fixed by means of the splines 2. In the ring 3 there are cylindrical holes, the centers of which are equidistant from its axis and are at the same distance from each other. In the holes, axles 4 are placed, carrying disc cutting elements 5 and gears 6. Wheels 6 are coupled with gear 7 mounted on the shaft 8 of the electromagnetic brake 9 of a normally closed type. The gears 6 are spring-loaded in the axial direction by the springs 10. The gear 7 is mounted on the shaft 8 movably in the axial direction and is connected to the spring of the electromagnetic brake 9. The shaft 8 of the brake 9 through the gearbox 11 is connected to the shaft of the stepper motor 12. The brake housing 9, the gearbox 11 and the electric motor 1 is fixed in the housing 1.

The gears 6 and gear 7 are made involute-conical, the big ends of the wheels 6 are directed towards the electromagnetic brake 9, and the larger end of the gear 7- into the old gear 7 mounted on the shaft 8 of the electromagnetic brake 9 and preloaded spring. The shaft 8 is connected via a gearbox 11 to the shaft of the stepping motor 12. 1 3. p. F -s, 3 ill.

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five

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on the disk cutting elements 5. The ring 3 is held on the body 1 by a spring ring 13.

The gear 7 is connected to the shaft 8 of the electromagnetic brake 9 via a key 14 with the possibility of axial movement along the shaft. In the groove of the gear 7, a spring 15 is fixed, resting against the brake brakes. In the housing 16 of the brake 9, the coil 17 is fixed. In the central opening of the coil, there is a measles 18, made in the form of a pressure disc. The anchor 18 is connected to the shaft 8 by means of splines 19. The spring 15f presses the end of gear 7 to the end face of the core 18 and presses the latter to the friction disk 20 with internal splines, which it is connected to the shaft 8. Moving along the shaft 8, the friction disk 20 appears pressed against the friction disc 21, which is also connected by means of splines to the housing 16 of the electromagnetic brake 9, then this disc is pressed against the next disc with internal splines, etc., thus creating the necessary frictional force between the discs. The latter disk is pressed against the supporting disk 22, held against axial movement by the cutting ring 23, to which the force of the spring 15 is transmitted through the sleeve 24 and the inner ring of the bearing 25. The spring 15 is fixed in the brake by means of the ring 26.

When voltage is applied to the coil 17, the measles 18 are drawn into it and, moving along the brake shaft 8 in the axial direction, causes gear 7 to also move along the shaft in the direction of the cutting elements. The spring 15 is then elastically deformed, and the friction discs 20 and 21 are free, which allows 31291313

The shaft rotates gear 7 in the desired direction.

The device works as follows.

DJecrepHH 7, moving toward the cutting elements 5, wedges the gear train. The motor shaft is rotated, and this rotation through the shaft of the gearbox 11, the shaft 8 of the electromagnetic brake 9, the involute bevel gears 6 of it 7 is transmitted to the disk cutting elements 5, which rotate at a predetermined angle. Then the power to the motor 12 and the gearbox 11 is turned off. The compressed spring 15 of the brake 9 is expanded, creating a braking force and moving the gear 7 along the shaft 8 in the direction of the electromagnet 9.

fO

f5

the following cutting edges, which together form the following tools for machining a hole, for example a reamer.

Then the threaded head is fed to the hole of the workpiece and the hole is unfolded. The re-turning from the disk cutting elements to the new working position is performed again. And so, after each transition, a quick simultaneous change of all cutting edges is made — replacing one type of tool with another, which significantly reduces the time needed.

Claims (2)

1. Threading head, in core Due to the special shape of the teeth of the evol-20, which are placed with possibly conical wheels, gear 7 is jammed in the gears 6, which increases the reliability of fixing the disk cutting elements 5 in the required position. After the cutting edges are set to the desired position of the thread-cutting, the head is guided with its cutting elements to the rotating workpiece and the hole is drilled. At the end of the countersink, the head is removed from the hole in the workpiece. The windings of the electromagnet 9 and the electric motor 12 are powered again. The spring 15 of the brake 9 is compressed and turned off, while the gear 7 is again shifted towards the disk cutting elements 5, wedges the involute-bevel gear and the shaft of the electric motor 12 turns the disk cutting the elements 5 at a given angle, set in the working position O five the following cutting edges, which together form the next type of tool for machining a hole, for example a reamer. The threaded head is then fed to the hole in the workpiece and the holes are deployed. The turn from disk cutting elements to the new working position is again made. And so, after each transition, a quick simultaneous change of all cutting edges is made — replacing one type of tool with another, which significantly reduces the auxiliary time. Invention Formula 1. Threading head, in which box it is placed with possible 5 0 five 0 By joint rotation on axles, disk cutting elements with boring and threaded sections, which means that, in order to increase productivity, the mechanism of rotation of disk cutting elements is made in the form of rigidly connected to the casing of a stepper electric motor with a gearbox, , magnetic brake and shaft with spring-loaded gear and spring-loaded gear wheels placed on the axles with the possibility of interaction with the gear. 2. The head according to claim 1, characterized in that, in order to increase the reliability of fixing the disk cutting elements, the gears and gears are made involute-conical, with the large ends of the gears directed towards the electromagnetic brake, and the larger end of the gear wheel towards the disk cutting elements. Fie.2 25 Editor O. Vugir Compiled by A. Klimov Tehred V. Kadar Proofreader I. Muska Order 80/14 Circulation 976 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 3 Subscription