According to the characteristics of micro EDM, to form a complete process control system, the following basic functions must be available.
(1) The spindle rotation function is mainly speed control, and the system uses a DC servo motor as the actuator.
(2) The spindle feed drive function includes speed control and position control. The stepper motor is used as the actuator, and the control system is required to work in two ways: jog and continuous rotation.
(3) Micro-energy pulse power control function: Since the micro-energy pulse power supply has a great influence on various indexes of EDM, in the process of micro-EDM, the numerical control system needs to be able to control the pulse power parameters in real time, such as peak current, Open circuit voltage, pulse width, pulse, etc. It is required to be able to control each item individually.
(4) The detection function of the machining discharge state can detect the voltage between the electrode pairs for the system to make a decision.
(5) The knife lifting function is used to eliminate the erosion product in the discharge gap.
Due to the harsh working environment of the micro-EDM digital control system, various external interferences are distributed on the processing site, and the electromagnetic wave interference generated by itself is a non-negligible interference source. Therefore, in addition to the above basic functions, the system must also be Reliability, anti-jamming, usability and other aspects are considered comprehensively. Take the following plan in the design:
(1) Provide 16 digital outputs, complete current/voltage selection, pulse width and pulse interval selection, and various switching control functions;
(2) Provide A/D conversion channel to monitor the processing status of the system in real time;
(3) providing a pulse signal for controlling the speed and position of the stepping motor and the DC servo motor;
(4) All levels and pulse signals are optically isolated to improve the anti-interference ability of the system. The analog signal uses an opto-isolated amplifier to separate the field signal from the control signal.
(5) Many optimizations have been made to the power supply and wiring to reduce unreliable factors;
(6) The connection between the system and the ISA bus, mainly the chip select signal, is realized by a programmable logic device GAL22V10, which simplifies the compilation circuit, enhances the reliability, and has certain confidentiality.
(Finish)
Zinc Die Casting Products are a metal forming process in which molten zinc metal is put under pressure and injected into a die.
Zinc are alloys that have high strength and hardness, outstanding corrosion resistance,full recyclability, mechanical properties, high thermal and electrical conductivity and strength at high temperatures. Zinc alloys possess high dimensional stability for complex shapes and excellent thin walls. The cost of raw material is low.
Zinc Die Casting Products are efficient and economical and offers a wide range of durable shapes and components. Little or no machining is required after a part is die casted, because the process provides very close tolerances for even complex shapes. Zinc Die Castings can also be easily plated or finished. Zinc Die Casting Products are dimensionally stable and heat resistant.
Although this alloy exhibits excellent casting characteristics, it has seen limited use by die casters. It does however possess some interesting characteristics that may be of assistance to designers. Its creep performance is rated higher than the other zinc alloys and it maintains higher strength and hardness levels after long-term aging.
The behavior of zinc alloys under stress is non-linear and time-temperature dependent on strain-rate, i.e. the ratio of stress to strain is not constant, even at low stresses, and varies with time resulting in continuous plastic flow under constant applied load. Designers of structural components should be aware of the creep limitations of zinc alloys, which do not have a single value for elastic modulus or yield strength. Yield strength (allowable stress) under sustained loading is dependent on the allowable design strain (% elongation) over the required service life. Working values for the elastic modulus and yield strength are important for design purposes. Standard engineering formulae used for calculating cross-sections of elastic materials must therefore be used with some caution.
This alloy exhibits excellent damping capacity and vibration attenuation in comparison with Aluminum Die Casting alloys.
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Zinc Die Casting Products
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