RU129030U1 - VIBRATOR DRILLING DEVICE - Google Patents

Abstract

A device for vibrational drilling, comprising a housing inside which a shaft, spindle shaft, gear, elastic holders and electrodynamic vibration exciter are installed, characterized in that the electrodynamic vibration exciter consists of two inductance coils with a U-shaped core made of electrical steel.

Description

The utility model relates to the processing of metals by cutting, and in particular, to devices for metal-cutting machines belonging to a boring-boring and milling group with a vertical spindle arrangement for increasing productivity and improving the quality of hole formation.

The vibro-drilling device consists of a housing, inside of which there is a shaft, a spindle shaft with a tool fixed on it, elastic holders, an electrodynamic vibration exciter. The electrodynamic vibration exciter, in turn, consists of a housing, inside of which a power unit is located, consisting of two inductors. The upper coil connected to a direct current source and fixed motionless on the upper part of the housing consists of a set of U-shaped plates made of electrical steel and a winding. The lower coil connected to the AC source is installed coaxially with the upper coil and has the ability to move in the axial direction. The lower coil as well as the upper coil consists of a set of W-shaped plates made of electrical steel and a winding. The housing can be equipped with various means of fixing the device on the machines of a boring-boring and milling group with a vertical spindle arrangement.

Closest to the claimed solution is a vibro-drilling device (patent No. 2386520 C1, 07/22/2008, IPC VV 35/00). This device contains, installed inside the housing, the spindle shaft with the tool, elastic holders and electrodynamic vibration exciter, providing vertical reciprocating movement of the tool.

The disadvantage of this device is the design of the electrodynamic vibration exciter, consisting of inductors of this type, which imposes fairly narrow restrictions on the operating modes of the drilling device, not allowing for highly efficient chip crushing. In particular:

- vibro-drilling device does not allow to achieve high-performance drilling of holes due to the low traction force of the electromagnets;

- the operation of the device is limited by a sufficiently narrow range of frequencies of axial vibrations, because Inductors of this type have a relatively long response time;

- a small range of machined parts, due to the low intensity of chip crushing.

The task, the solution of which the claimed solution is directed, is:

- increased drilling performance by increasing the traction force of the electromagnets;

- expanding the frequency range of axial vibrations due to inductors of a more suitable type;

- expanding the range of machined parts, due to the possibility of more intensive crushing of chips and a wider frequency range of axial vibrations.

To solve this problem, a device for vibrational drilling is proposed that contains a clamp for fixing the vibro-drilling device on the machine, a housing with a shaft, a spindle shaft, elastic holders, an electrodynamic vibration exciter, which in turn consists of a housing, an upper inductor connected to a constant source current and lower inductor connected to an AC source.

The upper inductor is fixedly mounted on the upper part of the housing, and the lower coil having the possibility of axial movement relative to the upper coil has a kinematic connection with the spindle shaft. Inductors consist of a set of W-shaped plates of electrical steel and a winding. The spindle shaft is connected to the machine spindle via a spur gear. To give additional rigidity to the vibration drilling device during processing and the possibility of uniform rotation, angular contact bearings are installed on the spindle shaft.

This embodiment of the device, given a combination of features provides an extension of the range of drilling modes, which leads to increased processing productivity, intensification of the process of crushing chips, expanding the range of processed products.

Figure 1 shows a device for vibrational drilling in section. It contains a clamp 1 for securing the device to the machine, housing 2, a shaft 3, a spindle shaft 4, elastic holders 5, an electrodynamic vibration exciter, which in turn consists of a housing 13, an upper inductor 6 connected to a direct current source, are installed inside the housing 2 and a lower coil 7 connected to an AC source. The upper coil 6 is fixedly mounted on the upper part of the housing 8, the lower coil 7, with the possibility of axial movement relative to the upper coil 6, has a kinematic connection with the spindle shaft 4. The inductors 6 and 7 consist of a set of U-shaped plates of electrical steel and a winding . The spindle shaft 4 is connected to the machine spindle through a cylindrical gear 9, 10 and shaft 3. To give additional rigidity to the vibration drilling device during processing and the possibility of uniform rotation, angular contact bearings 11 and 12 are installed on the spindle shaft 4.

The proposed vibro-drilling device operates as follows. Rotational movement to the spindle shaft 4 is transmitted from the machine spindle by means of the shaft 3 and a gear 9, 10. An additional vertical reciprocating axial movement with a predetermined force and amplitude is transmitted to the spindle shaft 4 by means of inductors 6, 7 and elastic holders 5. When current is supplied to the inductors 6, 7, they are repelled from each other, which causes the lower coil 7 and the associated spindle shaft 4 with the tool to move relative to the upper the sprocket 6. In this case, the elastic holders 5 bend and after the termination of the current returns the spindle shaft 4 with the tool and the lower coil 7 to its original position. Thus, drilling is performed with the imposition of vibrations in the axial direction.

Claims (1)

A device for vibrational drilling, comprising a housing inside which a shaft, spindle shaft, gear, elastic holders and electrodynamic vibration exciter are installed, characterized in that the electrodynamic vibration exciter consists of two inductance coils with a U-shaped core made of electrical steel.

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