SU1202728A1 - Method of machining non-rigid articles - Google Patents

Description

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The invention relates to metalworking and can be used in the processing of non-rigid parts and machine tools using automatic control systems and CNC.

The purpose of the invention is to improve the machining accuracy by measuring the elastic deformations of the parts and eliminating the influence on the measurement result of the linearity of the machine guides.

The drawing shows a diagram of the device for implementing the method of machining non-rigid parts.

The device contains part 1, which 5 / is installed in the front 2 and rear 3 chucks of the turning mill: - ka. The cutter 4 is fixed in the tool holder 5 of the caliper 6. The cutter 4 is used to machine the part 1. The soup port 6 moves along the rails 7. On the tool holder 5, there are two electromagnetic sensors 8 and 9, which measure the elastic deformations of the part 1 relative to the support 6 according to the size of the gap between the part 1 and the coils of the sensors 8 and 9, Outputs

sensors 8 and 9 through analog-digital converters 10 and 11 are connected to the block 12 for determining the position of the axis of the part 1. made on the basis of a microprocessor-based automaton. the position of the part axis for issuing commands to the definition of two, section G; the first of which is combined with the second section from the previous measurement cycle. The output of block 12 via digital-to-digital converter 14 and through control circuit 15 is connected to the mechanism 16 for varying and adjusting the tensile force along the length of the treatment. In addition, they are indicated in the drawing; j:, Y ,,, ... Y the elastic deformations of the part under the action of cutting forces, wear and non linearity of the elastic guide of the front and rear

fillets; l

X

2

j j; - elastic movement of the caliper from wear and non linearity of the guides.

The method of mechanical processing; non-rigid parts are implemented as follows.

Item 1 is set and clamped in the front 2 and rear 3 lathe chucks. The drive is turned on. The head of the two-piece and part 1 are driven into rotation. The cutter 4, which is fitted with the tool holder 5 of the caliper 6, is guided to the part 1 and pierced. Su port 6 is informed by the movement of the working feed and the part I is machined. When the slide 6 moves with the cutter 4 along the part 1, the sensor 13 is polar; kepi 1: -: ... the piston pulls the discrete signals when moved to distance O. equal to the distance between 1 sensor centers 8 and 9. The discrete signal from the output of the sensor 13 positions are clocking for the microprocessor-based automaton 12, Within cycle B of the microprocessor-based automaton 1, calculate} the green elastic deformation of the part. I - taking into account the deviation X; from the straightness of the machine guides and squeezing of the p.por t yy and Y; - elastic deformations of the part qT are valid for cutting forces. These deviations are calculated by the signals from sensors 8 and S4 received through analog-to-digital converters 10 and 11 in a microprocessor-based automaton 1-2. In each subsequent measurement cycle, data 1-ik 9 occupies the polo / ssenie sensor 8 in the previous measurement cycle. If we denote fgj.5 f, (to L / S, .. db L is the length of the part) - signals from the outputs of sensors 8 and 9. respectively, in the Kth cycle (at the Kth step). Measurements, then the elastic deformations Part 1 or 1, which determine the position of its axis when the cutter 4 is removed by distance Ko from the rear 3 cartridge, is determined by the algorithm

v, .- i.o.

So before starting processing in the zero (.) Measurement cycle, the readings of sensors 8 and 9 are as follows:

Y,

X.

Y,

1 о vo - 0 о accept zero begin n. Then the first zero deviates from Y, details from .p.

others us.11., X.0

55

Y f -

.WITH ,; 1 vd J-90

In the first measurement cycle (), when the support 6 with the cutter 4 and the sensors 8 and 9 will pass along the part 1 a distance of equal to the distance between the sensors 8 and 9, i.e. when sensor 9 takes the sensor position

31202728

8 in the zero measurement cycle, while the signal is proportional to the received elastic sensor in the block 12

Y. (K 0, p) details 1, through digital 2 g, Y, - X, (analog converter 14, from where the deviation Y of detail 1 from j sticks to the control circuit 15 and even more linearly to the adjustment mechanism 16

stretching force along the length of the machining i Si 9 90 etc., ki details 1. The mechanism 16 changes ie we arrive at algorithm (1). The projected magnitude of the tensile force and the frame for the microprocessor auto- mation suppresses or reduces the rigidity ta. 12 are compiled by algorithm (1). details 1 along the length of processing.

Compiled by V. Wlodawsky Editor A. Shandor Tehred A. Kikemezey Corrector. A.T.

Order 8355/12 Circulation 1085 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

Claims (1)

METHOD OF MECHANICAL SILVER - “DUTY OF RIGID DETAILS, in which the elastic deformations of parts are measured and tensile force is applied along the axis of the part, the value of which is regulated depending on the magnitude of the deformations, which is measured in order to increase the accuracy of processing discretely the position of the caliper relative to the part in its two sections when moving the tool relative to the part, and each subsequent measurement is made so that the first of the measured sections coincides with the second section from the previous the measurement cycle, in each measurement cycle, the difference in readings in the two measured sections is determined, and the elastic deformations of the parts are determined by sequential summation of the indicated differences in the readings. l