Installation for operations magnetic-pulse stamping

 

The invention relates to magnetic-pulse stamping and is intended for use in mechanical engineering in shaping operations magnetic-pulse stamping. Installation for operations magnetic-pulse stamping contains connected in series to the rectifier-charger connected in parallel to his conclusions unit capacitive energy storage, the switch current and the inductor. The installation also contains a control unit voltage polarity, the key device, the contactor and the voltage source. Between the switch current and the inductor included shut-off diode. The findings of the unit capacitive energy storage connected to the leads of the rectifier-charger through power switches contactor. Power switches connected to the control unit of the polarity of the voltage. The control unit of the polarity of the voltage connected to the key device. The key device is connected to a voltage source through a contactor. The invention improves the efficiency of the process of discharge of capacitive storage devices, to reduce the energy intensity of manufacturing operations. 1 C.p. f-crystals, 1 Il.

The invention relates to the field of magnetic-pulse processing metastable: hand crimping, calibration, Assembly, and others, performed on special equipment - magnetic-impulse installations.

Known device for magnetic-pulse stamping [USSR author's certificate 1731361 A1, CL 21 D 26/14, 1992], which contains capacitive energy storage inductor connected in parallel through the switching element series-connected step-up transformer, a rectifier, a switching element made in the form of means included dynistor.

This setting has a significant drawback: lose at the discharge drives the energy is not used, and is dissipated into the surrounding space.

The closest adopted for the prototype is the unit for magnetic-pulse stamping [USSR author's certificate 605661 class. 21 D 26/14, 1978] , consisting of connected in series to the rectifier-charger with parallel connected to its conclusions unit capacitive energy storage, switch, current, and inductor.

Task to be solved by the present invention is directed, is to increase the efficiency of the process of the capacitive discharge of the drives, as well as reducing the energy intensity of manufacturing operations.

The required task dostigaet ramiele-charger connected in parallel to his conclusions unit capacitive energy storage, the switch current and the inductor, while it contains a control unit voltage polarity, the key device, the contactor and the voltage source, while between the switch current and the inductor included cutting off the diode, and the findings of the unit capacitive energy storage connected to the leads of the rectifier-charger through power switches contactor connected to the control unit of the polarity of the voltage control unit of the polarity of the voltage connected to the key device is connected to the voltage source through the contactor.

In addition, the installation includes a block divider, the control unit of charge, the control unit discharge, the second key device and the second contactor, the block voltage divider is connected directly to the terminals of the unit capacitive energy storage and is connected to the control unit of the polarity of the voltage with the unit charge control connected to the control unit by the discharge, which is connected to the switch current, and the second key device connected to the voltage source through the second contactor.

The apparatus for magnetic-pulse forming is proposed and implemented a new circuit solution, which improves it there for some time until the next charging drawer. The energy gain in this case is increased, if the unit operates in automatic mode, i.e. it is a continuous process.

Now with the widespread introduction in the domestic industry semiconductor elemental devices have opportunities to create new control systems magnetic-impulse installation with high precision, stability and reliability, and compactness and relatively low cost.

When working magnetic-impulse installations there is a discharge capacitor to the inductor with the workpiece. Thus the current in the circuit varies in a sinusoidal manner and has a fading character.

It is known that the process of deformation of the workpiece by the magnetic-pulse stamping of critical importance are the amplitude and time of the first half period of the discharge current, which is calculated in advance for the respective process operations. Subsequent half-periods of the discharge current leads to an unnecessary overheating of the inductor to decrease the service life of the unit energy storage and tool - inducer.

Currently, there are magnetic-impulse installations running on t the capabilities of these units are provided with an additional shunt circuit, with the help of which all the "extra" half-periods of the discharge current zamorachivatsja the ground, and the inductor is allocated unipolar impulse discharge current, while the subsequent half-periods of the discharge current does not result in overheating of the inductor and do not reduce the service life of the unit energy storage and tool - inducer.

To illustrate the described installation is a diagram of the control unit.

The installation consists of the transformer 1, contacts 2, 3, 4, 5, rectifier-charger 6 is connected to the transformer unit capacitive energy storage 7, the switch 8 is connected to a powerful chopping semiconductor diode 9, which is connected to the inductor 10, a control unit discharge 11 connected to the switch, the voltage divider 12, which is connected to the control unit polarity 13, a control unit of the battery 14 connected to the control unit discharge, key devices 15 and 16 and respectively connected contactors 17 and 18.

Functions of the proposed device is as follows.

At the initial moment of switching on the key device 15 is activated and connects the contactor 17 to the voltage source. Pins 2 and 3 are closed and block the drive is a long 14. Using the switches displayed on the instrument panel, the installation sets the off time of the key device 15. As soon as the unit capacitive storages charged to the specified voltage, the contacts 2 and 3 will open. Then the operator actuates the switch 8 connected to the control unit discharge 11, and the current from the charged unit of energy storage will flock to the inductor through a powerful chopping semiconductor diode 9. Then recharge the capacitive battery, and the current reaching zero at the end of his first half-cycle, it stops being blocked in the reverse direction of the diode 9.

Thus, the unit drives is recharged reverse voltage, which is detected by the control unit polarity 13. The latter responds and connects the contactor 18 to a voltage source. Pins 4 and 5 are locked in the down position and remain in this state until, until you change the polarity of the voltage on the power of energy storage 7.

When the next charge unit drives the energy taken from the network is already less energy by an amount still remaining from the first time and so on, When the unit is switched off from the network unit of energy storage is grounded through ECCI discharge current, leads to more efficient use of stored energy and increase resource production tool, but also increases the efficiency of the equipment due to the fact that the "extra" energy reserves in storage tanks and keeps it there for some time until the next charging drawer. The energy gain in this case is increased, if the unit operates in automatic mode, i.e. it is a continuous process. The proposed new scheme of magnetic-impulse installation allows you to create unipolar pulses of discharge current and to reduce the energy intensity of the operation.

Claims

1. Installation for operations magnetic-pulse stamping, containing in series a rectifier-charger connected in parallel to his conclusions unit capacitive energy storage, the switch current and the inductor, characterized in that it contains a control unit voltage polarity, the key device, the contactor and the voltage source, while between the switch current and the inductor included cutting off the diode, and the findings of the unit capacitive energy storage connected to the leads of varnosti voltage, the control unit of the polarity of the voltage connected to the key device is connected to the voltage source through the contactor.

2. Installation under item 1, characterized in that it contains the unit of the voltage divider, the control unit of charge, the control unit discharge, the second key device and the second contactor, the block voltage divider is connected directly to the terminals of the unit capacitive energy storage and is connected to the control unit of the polarity of the voltage with the unit charge control connected to the control unit by the discharge, which is connected to the switch current, and the second key device connected to the voltage source through the second contactor.

 

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