SU986742A1 - Cutting method - Google Patents

Description

The total cutting area for the experiment was 0.8 m.

The cutting was made with a diamond wheel with a diameter of 40 mm and a diamond layer of 2.2 mm, with an angle of 15 °, Circle. The central part of the circle, 0.4 mm thick, is made of ACC diamonds, 250/200 grained, on the MP1 metal bond.

The feed value is determined by the following relationship:

qol 1 mm

min

where V is the tool rotation speed - 25 m / s;

B - the base of the natural logarithm - 2,7183i

H - cutting depth - 120 mm. The values of abrasiveness and energy intensity are chosen from the table. one.

Table 1

For technical with a Mohs hardness of 6.5 units K e 2.1, Ka 1.3, When these values were substituted, the feed rate Vp was 10 mm / m. the angular profile, the power is 0.6 KW, while the rean power with the circles of the straight profile is 2.5 KW. It has also been established that cutting with a feed determined from the above relationship ensures uniform wear of the side surfaces of the abrasive layer of the tool. 320 ° 1.1 415 ° 0.6 510 ° 6 Method of cutting circles with a straight new 2.5 profile (prototype)

As follows from the data given, when cutting around a circle with the angle of the table, a significant reduction in filing 15, Perhaps a further reduction in cutting power (4 times) to achieve this angle would still allow maintaining its angular shape. To maintain a sharp edge of the abrasive layer during the cutting process, a tool (Fig. 2) with a more wear-resistant layer in its central part can be recommended, which allows to obtain a constant edge radius equal to half the thickness of this layer. Similarly to the method described in the example, the ill was carried out a series of tests of the method at different profile angles. The test results are shown in Table. 2. T-table, 2 increases to 2 kW. Top wear is observed, power rises to 1.4 kW. The angle of the profile is maintained, the power is the same (0.6 kW)

a more substantial reduction in power, but at the same time, the abrasive layer of the tool is not sufficiently strong.

In a feed cutting process determined by this method, only the abrasive layer of a circle with a profile angle of 15 ° wears evenly and this angle remains unchanged. With an increase in the angle, an increase in the wear of the profile tip is observed, which leads to an increase in the cutting power.

Therefore, the need arises. Correction of the circle in the process. When the angle of the circle profile to. 20 ° top wear is minor and does not require frequent circle editing. With a profile angle of more than 20 °, the wear at the apex is so intense that (due to the need for frequent revisions of the circle), cutting it is impractical to make these circles.

Thus, the technological efficiency of this method lies in the fact that the cutting power is in the range of 1-0.6 cat, i.e. decreases 3-4 times.

The most optimal are the angle profiles of a circle of 15-16 °, since at these values its abrasive layer is completely used without adjusting the profile, which simplifies the process and reduces the consumption of abrasive material.

Claims (1)

1. USSR author's certificate W 149323. cl. B 24 B 27/06, 1960. B