RU2023548C1 - Disc milling cutter - Google Patents

Abstract

FIELD: metal cutting. SUBSTANCE: milling cutter has a built-up body, having two separate discs, that may be rotated in an end plane one relative to another. EFFECT: enhanced structure of the milling cutter. 1 cl, 2 dwg

Description

 The invention relates to the processing of metals by cutting and can be used in the construction of double-sided disk cutters in the processing of grooves in various details.

 A known design of disk cutters [1], in which the teeth of the cutters are installed with a constant value in the prefabricated housing structure. The proposed solution provides metal savings and manufacturability. It does not allow changing the size of tooth spacing, and therefore does not have universality.

 In analogy, in order to increase the manufacturability of the design and the accuracy of the installation of the plates, the housing design consists of three basic elements. The design of the milling cutters does not allow the processing of deep grooves, it does not allow changing the size of the tooth spacing.

 As a prototype, the design of a disk mill is adopted, in which, with the aim of expanding technological capabilities by using inserts of various sizes, the case is made prefabricated, consisting of two parts with the ability to adjust the distance between them, while the cutting inserts are in contact with the base surfaces of both parts. The design of the cutter allows you to process grooves of different widths, but without the possibility of changing the angular arrangement of the teeth, which does not allow damping vibrations arising during cutting.

 The aim of the invention is to improve the quality of processing by increasing the vibration resistance of the cutter optimization of the magnitude of the difference.

, где ω_фр- угловая скорость вращения фрезы;
ω_о- собственная круговая частота колебаний;
N - номер безвибрационной зоны.The goal is achieved by using a milling cutter, comprising a composite housing containing mounting and working parts, the cutting teeth of which are arranged with an uneven circumferential pitch. The cutter body is made integral with the possibility of rotation in the end plane of the components relative to each other, while the tooth spacing Δε is determined in accordance with the ratio:
Δε =

where ω _fr - the angular velocity of rotation of the cutter;
ω _about - own circular frequency of oscillation;
N is the number of the vibration-free zone.

 In FIG. 1 shows a diagram of the angular arrangement of teeth; figure 2 is a section aa in figure 1 (a possible connection of the half-shells and their relative rotation).

The half-shells 1, 2 of the mill with its mounting hole are installed on a common mandrel (not shown). The teeth of 3 cutters are installed in each half-shell with a uniform circumferential pitch ε _o = ε ₁ + ε _2. Connection of the half-shells is possible with screws 4.

 The adjustment and operation of the invention is as follows.

Having determined the required difference Δε = ε ₂ -ε ₁ with the loosened screws 4, rotate the half-shell 2 relative to the half-shell 1 by the required angle, which is possible due to the presence of a groove in the half-shell 2 (Fig. 1). This adjustment can be carried out both when assembling the mills, and on the machine, as in the half-shell 2 there is no keyway 5 available in the half-shell 1 (figure 2). After that, the screws 4 are tightened with a force that ensures the transmission of the required torque. The torque during operation of the cutter is transmitted through the key connection in the half-housing 1.

, где N - номер безвибрационной зоны.The choice of the difference Δε is carried out from the damping condition of the arising oscillations. The most common in the system are forced and self-oscillations. Since the nature of these vibrations is different, to reduce their intensity requires a different effect, in particular, through the nature and magnitude of the difference. The present invention relates to the case of damping self-oscillations. The stability of the milling process is determined by a certain ratio of the divergence Δε, the angular speed of rotation of the cutter ω _fr and the natural circular frequency of oscillations ω _о :
Δε =

where N is the number of the vibration-free zone.

 The resulting relationship reflects the conditions of the operation, and in each case, the magnitude of the difference should be different, this is confirmed by the experimental results of many researchers.

Claims (1)

 A DISC MILL, containing a composite housing with mounting and working parts, as well as cutting teeth arranged with an uneven pitch, characterized in that, in order to improve the quality of processing due to increased vibration resistance and due to the optimization of the difference in pitch, the housing parts are rotatable with one relatively different in the end plane.

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