RU1812013C - Device for machining multistart helical grooves - Google Patents

Abstract

Usage: the device provides the milling of intermittent multi-thread helical grooves on a multi-operation CNC machine. SUMMARY OF THE INVENTION: the device comprises a stand rigidly mounted on a rotary organ of the machine; front center, rear center, leash and division mechanism. The division mechanism is made in the form of an electromagnetic clutch, two cylindrical gears kinematically connected to each other by means of a kinematic chain with a clutch. The presence of a chain enables the dividing, rotation of the part for processing a series of grooves relative to the rotary table, which is the drive of the dividing rotation. 3 ill.

Description

The invention relates to metal processing, in particular to the processing of helical surfaces, and can be used in the manufacture of intermittent helical grooves on multi-operation numerically controlled machines.

An object of the invention is to expand technological capabilities by allowing milling discontinuous helical grooves on an CNC multi-operation machine.

Fig. 1 is a perspective view of an apparatus for manufacturing discontinuous helical grooves on cylindrical surfaces; Fig. 2 - assembly of parts on a mandrel; Fig. 3 is a communication node of a support and a rotating center.

The proposed device comprises a support 1 with a rotating front center 2, a support 3 and a dividing mechanism in the form of an electromagnetic clutch 4 connected via a cylindrical wheel 5, a gear transmission

6-7, the coupling 8, the transmission 9-10 of the kinematic chain 11, the transmission 12-13 and the spur gear 14 with the support 1 mounted on the rotary table 15. On the rotary table 15 there is a rack 16 on which the support 3 and the electromagnetic housing are mounted couplings 4. By means of a support 1 and a clamping electromagnetic clutch 4, a part 17 is fixed on which intermittent helical grooves are cut. The bearing shaft 18 of the chain 11 connecting the gears from the side of the support 1 of the rotary table 15 and the gears from the side of the connecting 8 and the clamping 4 of the coupling is mounted on a pair of angular contact bearings 19 mounted in the bracket 20, rigidly mounted on the table 21 multi-operation CNC machines. To fasten the part 17 in the electromagnetic clutch 4 by activating the disks 22 with the coupling half 23 and the rotating disks 24, a rear center 25 is provided

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a leash 26 and a collar 27, mounted on the bottom of the part 17, the coupling half of the electromagnetic clutch 4 with rotating discs 24 and the spur wheel 5 are rigidly fixed to the rear center.

The cylindrical wheel 5 is rigidly connected to the coupling half of the rotating disks 24 of the electromagnetic coupling 4, while the casing of that coupling is rigidly connected to the stand 16. The angular contact bearing 28 i and the thrust bearing 29 are designed for the bearing coupling of the rotating center 2 and the support 1 ,

The support 3 comprises an element in the form of a sleeve, which is fixed rigidly on the non-machinable part (neck) of the part and rotates in the clamp housing with the aid of bearing coupling, while the clamp housing is fixed on the tank table post. A guide clip serves to support the part during the division operation.

The operation of the proposed device during grooving and separately during the division operation is as follows.

 A stand 16 is mounted on the turntable 15 of the multi-operation CNC machine. An electromagnetic clutch 4 clamps the part 17 by means of disks 22 and 24, which cuts a series of intermittent helical grooves according to the control program when combining the movements of the spindle into which the cone is mounted finger mill, and machine table. The spur wheel 5 and the gears 6-7 rotate idle when the electromagnetic clutch 8 is turned off. The gears 9-10, 12-13-14 remain motionless. A series of unbiased helical grooves 30 is cut along the length of the part in increments that are a multiple of the helix pitch.

After cutting through a series of screw grooves, the electromagnetic electromagnetic clutch 4 is opened for control by the control program, the product 17 is released from the clamp and its idle rotation is accelerated in the opposite direction by means of a device (gearbox) to the initial processing position of the next series of screw grooves. The rotation is carried out by an angle, the magnitude of the arc of which is inversely proportional to the disk of the grooves on the winding of the helix. For dividing rotation according to the control program, the rotary table 15 is rotated and the electromagnetic coupling 8 is turned on. When the electromagnetic coupling 4 is unclenched, the part 17 can freely rotate on the rotating center 2 of the support 1 in the support 3. The rotation of the part is transmitted from the rotary table 15 through a cylindrical gear 14, rigidly connected with the support 1 of the rotary table 15, gear 12-13, gear 9-10, then with the connecting

electromagnetic clutch 8, gear 7-6 and to a cylindrical wheel 5, rigidly connected through a free half-coupling of a clamping electromagnetic clutch 4 with part 17. Thus, the part, having received rotation

0 from the turntable 15, rotates at a speed independent of the rotational speed of the turntable 15 and exceeding it, while doing a rotation through 360 °.

The presence of the chain 11 makes it possible to divide the part by turning to process another series of grooves relative to the rotary table 15, which is the drive of the dividing rotation. The kinematic chain 11 provides an idle speed of the part 17 relative to the rack 16, exceeding the speed of the working rotation of the part together with the rack.

The value of idle rotation corresponds to the value of the circumferential step between the series of grooves 30 and 31. Therefore, the difference in the speeds of the working and idle rotation determines the deliberate operation of the device.

0 After turning a step, determining the distance between the series of unbiased discontinuous helical grooves, the processing of the next series of grooves 31 is performed.

Claims (1)

5 Claims A device for machining multi-helical helical grooves on a metal cutting machine, comprising a front center mounted on a rotary organ of the machine, 0 rear center, leash and division mechanism, characterized in that, in order to expand technological capabilities, the device is equipped with a rigidly connected stand with a rotary Organ of the machine with 5. The support designed to install the rear center in it and the thrust bearing, the division mechanism is made in the form of an electromagnetic coupling, one coupling half of which is rigidly fixed to the tincture, and the second coupling half is rigidly fixed to the rear center, and two kinematic chains connected to each other an additional coupling of cylindrical gears, one of which is rigidly connected to the second half of the coupling of the electromagnetic coupling, and the second gear is rigidly connected to the rotary organ of the strike and through the thrust bearing with the front chain In addition, the leash is mounted on the rear center of the device.