SU1214327A1 - Method of kinematic breaking of chips in n.c.vehicle - Google Patents

Description

The invention relates to the machining of metals by cutting, more precisely to methods of kinematic crushing of chips on machine tools with numerical control ()

The purpose of the invention is to improve the quality of the machined surface and the durability of the cutting tool without reducing the productivity of the treatment due to the fact that additional movements are made at an angle of about 20-40 ° to the instantaneous feed vector, then parallel to the instantaneous feed vector in the opposite direction angle P 180 –X to the instantaneous feed vector, and the height is isosceles the HOi o of the vector triangle, formed by additional tool movements, may be equal to the radial elastic def aids system

Additional movement of the cutting tool at an angle of θ (20–40 ° to the instantaneous feed vector ensures that the cutter retracts from the treated surface, which allows, due to a gradual decrease in the depth of the layer being removed, to smoothly reduce ci-shu cutting, and consequently, the load on the system AIDS, in contrast to the known methods, where the load increases sharply or sharply, respectively, is reset.

Moving the tool parallel to the instantaneous feed vector in the opposite direction removal of the cutter from the cutting surface provides guaranteed chip breakage.

Further PVC tooling at an angle E (80 ° - about {to the instant BEK vops feed, i.e., bringing the cutter to the work surface, completes the movement of the tool along the isosceles triangle t, that is. Smooth selection of the gaps in the machine kinematic screw pairs.

With the resumption of the cutting process, the cutting force increases gradually, smoothly loading the SS-U system as the cutting depth increases from zero to the maximum value, in contrast to the known ones; in ways where the load varies dramatically, in steps.

The angle limits are based on the properties of the formed material J, the geometrical shape of the current

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tool, performance, stiffness aids system. When the angle decreases to less than 20 °, an increase in the vector of removal of the cutter from the machined surface occurs, which significantly reduces the processing performance of the parts. Increasing the angle (above 40 ° negatively affects the durability of the cutter due to a decrease in

50 main angle in terms of H j increase the width of the slice, i.e. increasing the load on the cutter, causing increased wear and even destruction of the top of the p €;

5 A change in the magnitude of the angle P beyond the limits limited by the condition p -o / does not allow one to obtain an isosceles vector triangle, i.e.

2Q approach to the main vector feed line and “as a result, the identity of the choice of gaps on both coordinates in the machine head feed drives when performing cycles

25 chip breaking, which leads to an increase in the roughness of the treated surface, i.e. to lower quality processing.

Removal of cutter from machined

JQ of the surface by the value of the radial elastic deformations of the AIDS system, characterized by the height of an isosceles triangle, eliminates the incision of the tip of the tool into the machined surface during retraction

 , parallel to the instantaneous vector of the main feed in the opposite direction, so as to avoid increasing its roughness, 5 ie improve processing quality.

  Fig. 1 shows the general pattern of movement of the cutting tool when machining the contour of the part; on fkg. 2 is a diagram of the movement of the cutter along a vector isosceles triangle, which provides chip interruption in FIG. 3 - removal of the cutting tool from the treated surface; in fig. 4 - then from the cutting surface; Fig, 5 - water cutter to the treated surface.

The method is carried out as follows.

The cutter of a certain configuration of qing, for example, a feedthrough, feedstocks on the contour of the part 2 in the direction Sj (fig. T) are reported by additional movements

form a vector isosceles. a triangle (Fig. 2), which ensures a smooth removal of the cutting tool from the surface to be machined and a guaranteed chip break. Initially, the cutter moves along the vector, (Fig. 3) directed towards the main feed at an angle o (. 20-40 at the working feed (Sf ,, | S || by the value b (Fig. 2), equal to the radial elastic deformations of the AIDS system, gradually reducing the depth of the layer being removed and, as a result, reducing the cutting force and the load on the AIDS system compared to known methods, where the load increases or sharply decreases respectively.

Then, the cutter 1 at the accelerated feed is retracted along a vector (FIG. 4) directed in the direction opposite to the direction of the main feed vector Sj, ensuring a guarantee

Bathing the cutter from the cutting surface and chip breakage.

Next, the cutter along the Shi vector (FIG. 5, directed at an angle of 180 ° C, oi towards the main feed) is guided to the surface to be treated, ensuring a smooth selection of the gaps in the machine’s kinematic screw pairs.

After that, the cutter again continues the process of removing the main allowance, moving in the direction of the main feed vector Si by the amount Ej, selected depending on the required chip length, determined by the physicomechanical

the properties of the material being processed and the cutting conditions, after which the chip breaking process is repeated. Cutting force when plunging into the 20 main allowance increases gradually, smoothly loading the AIDS system as the cutting depth increases from zero to maximum.

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Thebes. 9

 VNNPI Order 826/17 Circulation 1000 Subscription Branch P1Sh Patent, Uzhgorod, Projecto st., 4

Claims (2)

1. METHOD FOR KINEMATIC CRUSHING OF CHIP ON MACHINES WITH NUMERIC SOFTWARE CONTROL, including moving the tool in the feed direction and additional movements for chip breaking, characterized in that, for the purpose of 2. The method of pop. ^ characterized in that the height of the isosceles vector triangle formed by additional movements of the tool is equal to the value of the radial elastic deformations of the AIDS system. eleven