RU2340428C2 - Cutting head for processing of multithread grooves in billet openings - Google Patents

Abstract

FIELD: technological processes, tool.

SUBSTANCE: cutting head for processing of multithread grooves in billet hole contains casing, in radial openings of which cutting elements are installed in the form of end form-milling cutters. Cavity is provided in casing, in which driving gear shaft is installed with tailpiece for transfer of rotation motion, and driven gear shafts are installed in radial openings of the casing, on which end form-milling cutters are fixed. Casing is made with the possibility of rotation together with end cutters around driving gear shaft, tailpiece of which is intended for connection to machine spindle.

EFFECT: expansion of technological resources.

5 dwg

Description

The invention relates to mechanical engineering, namely to machining of multi-grooves in a hole of a hollow billet with a diameter of more than 50 mm, including a variable pitch.

Known cutting head for machining multi-grooves in the hole of the workpiece (see a.c. SU No. 107633, IPC B23G 5/02, publ. March 25, 1958). The cutting head contains a housing, in the radial holes of which cutting elements are installed in the form of end shaped cutters, a cavity is made in the housing in which a drive pinion shaft with a shank is installed, and driven shaft gears are mounted in the radial holes of the housing, on which the end shaped cutters are fixed .

The disadvantages of the prototype are:

- the use of the device is limited, because it is intended for cutting three or four lead-in threads of a rectangular or trapezoidal profile of large diameter in the nuts of friction presses, even for presses with low effort, the diameter of the nut is more than 120 mm;

- the device is stationary in the direction of the axis of the drive pinion shaft relative to the stationary elements of the machine;

- the case of the device with cutters cannot rotate around the axis of the drive gear shaft, because rigidly connected with stationary elements of the machine;

- transmission of rotation to the drive pinion shaft is carried out by means of two gear wheels, one of which is mounted on the machine spindle, and the other on the drive pinion shaft.

The present invention solves the problem of increasing productivity and expanding technological capabilities in the processing of multi-grooves.

The present invention is aimed at achieving a technical result, which consists in increasing the dimensional stability of the cutting elements in the head, reducing the number of readjustments associated with changing the tool, and providing the possibility of machining grooves, including blind and with a variable angle of elevation.

To obtain the specified technical result in the proposed cutting head for machining multi-grooves in the billet hole containing the housing, in the radial holes of which cutting elements are installed in the form of end shaped mills, a cavity is made in the housing in which the drive pinion shaft with the shank is installed, and in radial holes of the housing are driven slave gears on which end shaped mills are fixed, new is that the housing is rotatable together with end fr Around the drive pinion shaft, the shank of which is designed to be connected to the machine spindle.

The execution of the housing with the possibility of rotation together with end mills around the drive gear shaft, the shank of which is designed to connect to the machine spindle, allows you to:

- expand the application, as the device can be used in the processing of multi-grooves of any profile in the holes of hollow parts with a diameter of 50 mm or more, including with the number of entries of more than four;

- the device can be moved in the direction of the axis of the drive pinion shaft together with the machine spindle of the boring-boring group relative to the stationary elements of the machine;

- the casing of the device together with the milling cutters can rotate around the axis of the drive pinion shaft;

- transmission of rotation to the drive pinion shaft is carried out by the shank of the drive pinion shaft mounted directly in the machine spindle.

Technical solutions with features distinguishing the claimed solution from the prototype are not known and do not follow explicitly from the prior art. This allows us to assume that the claimed technical solution is new and has an inventive step.

The invention is illustrated by drawings, where fit.1 shows a cutting head for machining four-way grooves in the opening of the workpiece; figure 2 - processing diagram of four-way grooves in the hole of the workpiece; figure 3 - the same diagram, a top view; figure 4 - processing diagram of four-way grooves with a variable angle of rise in the hole of the workpiece; figure 5 - the same diagram, a top view.

The cutting head contains a housing 1 with a stepped inner cavity in which, through the bearings 2, the spacer sleeve 3, the locking ring 4 and the cover 5, the drive gear shaft 6 is installed. Through the radial holes are made in the wall of the housing in a plane perpendicular to the axis of rotation, which by means of bearings 7, spacer sleeves 8 and covers 9, the driven gear shaft 10 is installed. The end face of the housing is closed by a cover 11. The driven gear shaft 10 is made with holes in which end shaped mills 12 with a working profile are installed plot corresponding to the groove profile on the workpiece 13 in its normal section. The drive pinion shaft has a shank 14 for attaching the cutting head to the machine spindle and transmit the rotation to the driven pinion shaft 10. The drive 6 and driven 10 of the pinion shaft can only rotate, while the housing 1 with the driven pinion shaft 10 has rotation around drive pinion shaft 6.

The device operates as follows.

By means of a shank 14, the cutting head is connected to the spindle of the machine (drilling, turning, milling) coaxially with the hole of the workpiece 13, which is fixed in the fixture of the machine. The rotation of the machine spindle is turned on, while the driven gear shaft 10 with cutters 12 rotate with a frequency n calculated based on the cutting speed, and the drive gear shaft 6 rotates with a frequency n ₁ , taking into account the gear ratio in the gearing. The cutting head is brought to the workpiece (or vice versa) and multi-feed grooves are machined in one pass by the relative movement of the cutting zones along the workpiece hole by adding the axial (s) and circular (ω) feeds, which provide a given elevation angle of the grooves. Depending on the design solution, the circular feed is carried out by rotating the workpiece 13 when the head housing 1 is stationary relative to the axis of rotation with the driven gears 10 and the milling cutters 12 fixed therein or by rotating the housing 1 with the driven gears 10 and the milling cutters fixed in them 12 with the stationary workpiece 13.

After processing, everything returns to its original position, while the cutters continue to rotate and return to their original position along the grooves. The processed workpiece is removed from the device.

Claims (1)

A cutting head for machining multi-grooves in the billet hole, comprising a housing, in the radial holes of which cutting elements are installed in the form of end shaped cutters, a cavity is made in the housing in which a drive pinion shaft with a shank for transmitting rotational movement is installed, and in the radial holes of the housing driven shaft gears are mounted on which end shaped milling cutters are fixed, characterized in that the housing is rotatable together with end mills around the leading shaft gear IDH, the shank of which is intended for connection to the machine spindle.

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