SU1172659A1 - Method of determining the elevation of subsequent and previous teeth of the broach - Google Patents

Abstract

A METHOD FOR DETERMINING THE RISES OF THE SUBSEQUENT AND PREVIOUS PROTAGES OF TEETH, consisting in successive cuts of the draw teeth, characterized in that, in order to improve the quality of the surface to be machined, on each subsequent cut, the lift on the previous tooth is changed with a predetermined step within 2 times. up to the radius of the cutting element, while simultaneously measuring the parameters of the stress waves on each cut, determine the dependence of the parameters of the stress waves on the magnitude of the rise to the best tooth, and the optimum rise for the next tooth is determined by the minimum value of the parameters of the stress waves, and the rise for the previous tooth is chosen equal to the difference between (L twice the rise for this tooth and the rise for the next one, s tooth. O)

Description

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The invention relates to mechanical engineering and can be used to determine the optimal lift of two adjacent teeth of a horn, for example, the last but one and the next. . .

The aim of the invention is to improve the quality of the treated surface beyond CMei: the elimination of the influence of the thickness of the layer cut by the previous tooth on the formation of asperities during cutting with a subsequent tooth.

FIG. 1 shows a device for carrying out the proposed method; in fig. 2 is a cutting tool for determining the optimum lift of two adjacent teeth; in fig. 3 is a plot of stress wave parameters versus the magnitude of the rise on the last tooth.

The device includes sample 1 of the test material, a piezoceramic sensor 2, a set of acousto-emission equipment 3 used to process the parameters of the Voltage waves. The kit consists of a preamplifier 4, an analyzer, 5 voltage waves of the LVN-1M voltage, a block of 6 filters of two recording devices 7 Н327 for recording the parameters of the voltage waves and the distance 8.

Voltage wave parameters are sensed by sensor 2, which is in contact with the surface of sample 1.

The device works as follows.

The stress waves arising in the sample 1 during cutting with 8 spacing J 0,42 J 0,35 I 0,3 I 0,25 I 0,18 I О, 10 I 0,16

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the receiving transducer of sensor 2 is fired and converted into an electrical signal. Then the electrical signal is amplified by preamplifier 5. Step 4 and is fed to the input of the band 6 filter unit 6, which provides a change in the registration bandwidth of the generated signal in the range O - 1200 kHz. The final signal processing is carried out by a voltage wave analyzer 5, which serves to extract signals with an amplitude higher than a given level, to form a signal

5 and the number of pulses in one second, and transmitting these signals to the recording device 7.

Primer p. A sample of the D-16 material was processed with free cutting, for example, by drawing. Produced 7 cuts, while on each subsequent cut reduced the rise on the previous tooth on

5 p} The size chosen from the value of double lifting to the value of the radius of rounding of the main blade. Double lifting is chosen according to the standards of cutting modes, in our case, 0.45 mm. The radius of the main cutting blade is 0.006 mm.

In the experiment, the rise on the previous tooth was reduced by

5 0.05 mm.

At the same time, at each cut, the parameters of the stress waves were measured, the intensity given in Table 3.

Voltage wave parameters — intensity, from magnitude to the next tooth t (FIG. 3).

From the plotted graph, the optimal rise for the next tooth was determined from the minimum value of the parameters of the stress waves, which in the experiment was 0.15 mm.

The rise on the previous tooth is selected as the difference between the double climb per tooth of 0.45 mm and the height of the next tooth 0.15 mm, i.e. equal to 0.3 mm.

t - rise to the next tooth. , N is the parameter VI (intensity), RCI is the parameter of roughness. The cutting tool 8. for determining the optimum lift includes a body 9 with cutting elements 10 installed in it, which are provided with gaskets 11 installed in a groove, the cutting elements being fastened with screws 12,

0.05 0.1 0.2 0.25 t

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Claims (1)

THE METHOD FOR DETERMINING THE RISKS OF THE NEXT AND PREVIOUS DRAWING TEETH, which consists in successive cuts of the teeth of the broach, characterized in that, in order to improve the quality of the surface to be machined, at each subsequent cut the lift on the previous tooth is changed with a predetermined step ranging from double the rise on the tooth to a value the radius of curvature of the cutting element, while simultaneously at each cut measure the parameters of the stress waves, determine the dependence of the parameters of the stress waves on the magnitude of the rise on the next tooth, and the optimal rise to the next tooth is determined by the minimum value of the parameters of the stress waves, and the rise to the previous tooth is chosen equal to the difference between the double rise to this tooth and the rise to the next tooth.