SU336123A1 - Machine for impact capacitor welding - Google Patents

Abstract

MACHINE FOR IMPACT SCENAIRING WELDING, containing two capacitor banks, rectifiers and a mechanism for colliding parts to be welded, is distinguished by the fact that, in order to improve the quality of welding, the capacitor battery of small capacity, charged from a high-voltage rectifier, is connected to the collision Parts through an eesistor, and another large-capacity capacitor battery, charged from a low-voltage rectifier, is connected to the parts to be welded through a resistor and an uncontrolled dividing diode.

Description

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The invention is preferred as a shock welding concentrator and can be used in various fields of instrument-making.

Known impact welding machines, containing two capacitor banks, rectifiers and a mechanism for colliding parts to be welded, do not always provide high-quality welding.

In order to ensure high-quality welding, a low-capacity capacitor battery, charged from a high-voltage rectifier, is connected to impact parts via a resistor, and another high-capacity capacitor battery, charged from a low-voltage microm- er, is connected to the parts to be welded through a resistor and uncontrolled isolation diode.

Fig. 1 is a schematic diagram of the device proposed; in fig. 2 shows current and voltage curves for parts during welding.

The device contains a switch K of general connection, a rectifier of a low voltage unit with a relatively high stabilized charging voltage (400–1500 V), an autonomous rectifier VU2 with a relatively low stabilized charging voltage. The negative terminals of both rectifiers are short-circuited. Between terminals (+)

(-) rectifier WU circuit included: 6 connected in series high-voltage battery capacitors C-j and resistor C.

Between terminals (+) and (-) of the VUo rectifier, a circuit is connected from the series-connected battery of electrolytic capacitors Co and a resistor used to control the welding mode. Terminal (+) rectifier VU tel connected to the terminal (+) rectifier VU ,, through the isolation valve B, connected by the anode to the positive terminal, VU, and the cathode - to the positive terminal VU2,

The negative terminal of both rectifiers is connected to one of the parts 1 to be welded. The second part 2 to be welded is fixed in the collision mechanism 3, driven by the spring 4. Part 2 through the MP2 contacts of the MT actuator, which performs only preparatory functions, is connected to (+) top mitel VU.

The machine also contains a latch 5 with an electromagnet, which actuates the impact mechanism 3, a control circuit with a two-handed button Kyf and КУ ;,

with the help of which the operation of the actuator MP is controlled, and the protection circuit, consisting of block contacts BK and BKr.

After switching on switch K, capacitor batteries C and C2 are charged

BEFORE selected voltage levels. When you press the buttons Cur and KU /. (in the initial state, the contacts of the BC are open, and the BCRs are closed) operates the magnetic actuator MP, closes its NO.

contacts MP and MP2 and disconnecting VU and VU2 from the network contacts MPa. In this case, the voltage of the capacitors is applied to the mechanism of the collision 3 and detal 2. At the same time, the magnet 6 is actuated.

The collision mechanism 3 breaks off the latch 5 and, under the action of the spring 4, the parts 1 and 2 strike.

When parts approach each other, an arc discharge arises, which is excited

a high voltage across the battery of capacitors C. The dynamic pressure of the electric arc makes it impossible for the parts to immediately touch. In the process of arc discharge voltage

the capacitors C .. drops and at the time when the voltage on both capacitor batteries becomes equal (time t in Fig. 2), the train begins to be maintained mainly due to the energy stored in the battery of electrolytic capacitors (plot, Fig. 2).

oh, this period, the parts are fused, and

at the moment of collision (sb ® welding takes place.

After the moment of impact, the current in the welding circuit quickly fades. The presence of separate adjustment of resistors makes it possible to independently regulate the durations of O-t and-b - t-g and the magnitude of the currents at each of the intervals, which allows the construction of an optimal technological cycle.

In addition to reducing the size and weight, the proposed device significantly increases the efficiency of the welding process.

It should be noted that the actuator MP does not perform switching when welding, and is intended only for preparatory operations and to ensure safety requirements.

Claims (1)

A machine for shock condenser welding, containing two capacitor banks, rectifiers and a collision mechanism for the parts to be welded, characterized in that, in order to improve the quality of welding, a small capacitor bank, charged by a high-voltage rectifier, is connected to the parts being shocked through a resistor, and the other capacitor bank large capacity, charged from a low-voltage rectifier, is connected to the welded parts through a resistor and an uncontrolled dividing diode.