SU908562A1 - Dimensional electrochemical machining method - Google Patents

Description

(54) METHOD FOR DIMENSIONAL ELECTROCHEMICAL TREATMENT

I

The invention relates to electrophysical and electrochemical processing methods and can be used in copy-piercing operations.

There is a method of dimensional electrochemical processing of pulsed current pulsed current pulses with the regulation of the parameters of immersions in the package and the cyclic supply of the electrode-tool. In the known method in the working period of the cycle in each package, the pulse smoothly reduces the amplitude of nmwuchss.

The disadvantage of this method is the low productivity of the process, since the amplitude of the pulses, while the value of the electrode gap does not change, reduces the anodic dissolution rate in the working period of the dicle.

The purpose of the invention is to increase processing performance.

This goal is achieved by the fact that during the working period of the cycle, the interelectrode gap is reduced by the exponential law, and the duration of the pulses in a packet at a constant repetition period is measured in proportion to the current interelectrode gap value. The maximum gap and pulse durations in the package, set at the beginning of the working period of the cycle, are determined from the absence of a gap at the maximum processing capacity, and the minimum interelectrode gap and longitudinal pulses in the package are determined

About the cycle period, is determined from the condition of ensuring the required processing accuracy.

The section presents the curves of changes in the interelectrode gap S (Fig. La) and, technological current pulses Ij- (Fig. 16)

5 of the proposed method.

In each single machining cycle, the tool is brought to the workpiece before touching (S 0), after which the tool is retracted from the workpiece to the gap

S Sj (CT + AS,

where the value of the interelectrode gap determined by the conditions for ensuring a given copying accuracy; D8 is the gap increment determined by the condition that there is no breakdown between the electrode gap. Starting from the gap S, a smooth approach of the tool to the part occurs exponentially and the supply of current pulses with a constant value of ne {repetition frequency (T Т const), the duration of which Tz is proportional to the value of the interelectrode gap. Processing starts at the maximum pulse duration. At this stage an intensive process of anodic dissolution takes place and the productivity will be maximized. With a decrease in the gap value, the duration of the pause between pulses increases. When the inter-Electrod gap reaches the S value, the pulse duration becomes minimal for the dash processing cycle. The value Tj is determined by the time required for copying accuracy. After the end of the working period, the tool is retracted to the flushing gap, under its water up to the part with the part, and the processing cycle is repeated. Increased processing performance leads to a reduction in the labor intensity of processing. On average, when processing the cavity of a strain, it is labor-intensive with the use of the proposed S-mm 0.03 0.03 0.05 D8, mm 0.1 0.1 0.1

Thwim. ms 0.5 1

0.5

S, mm 0.04 0.05 0.07

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20

28

18

tg, MII

Depending on the requirements of accuracy and performance, the parameters of the pulse-optical mode are selected using the proposed processing method.

Claims (1)

Invention Formula A method of dimensional electrochemical treatment with an impulse current with pulse pickets with cyclic feeding of an electrode tool and adjusting the parameters of pulses in a package during a working period of a cycle, characterized in that, in order to improve processing performance, the cycle period is reduced during the working period. exponential gap exponentially, and the duration of pulses in the package at a constant repetition period is proportional to the current value of the interelectrode gap, the maximum values of the interelectrode gap, and the duration of the pulses in the package are determined from the condition that there is no interelectrode gap at maximum performance, and the minimum Significantly determined from the condition of ensuring the specified accuracy of processing. Sources of information taken into account during the examination 1. USSR author's certificate N 493326, cl. B 23 P 1/04, 1973. 4 of this method will be reduced by 1 to 5 times in comparison with the known method, using a decrease in amplitude with fixed electrodes. Particularly noticeable is the effect of increasing productivity in the electrochemical processing of large areas. It is known from the practice of dimensional processing with pulses of short duration (less than 1 ms) that exceeding the treatment area of 10–20 cm leads to a sharp decrease in the anodic dissolution rate, especially when using passivating electrolytes. The use of the proposed method allows maintaining an average processing speed from 0.5 mm / min to 1 mm / min with practically any treatment area, if the conditions of the hydrodynamic regime are insulated. The results of the processing of the mold type Handle of steel 5HNVV with different parameters. D5, Tu | below, with a total surface area of 50 cm; period duration T 6.6 ms; working period duration 0.5 s; S is the value of the lateral clearance, accuracy kopiTtf r ifTwt