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Working principle of slow wire processing

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 Slow wire walking, also called low-speed wire walking, is a kind of CNC machining machine tool that uses continuously moving fine metal wire as an electrode to pulse spark discharge on the workpiece to generate a high temperature of over 6000 degrees, ablate metal and cut into a workpiece. The principle of wire processing is the phenomenon that there is a gap between the wire electrode and the workpiece, and the metal is removed by continuous discharge. Since the slow-moving wire cutting machine adopts the method of wire electrode continuous feeding, that is, the wire electrode is processed during the movement, so even if the wire electrode is worn out, it can be continuously supplemented, so it can improve the machining accuracy of the parts and slow the wire. The surface roughness of the workpiece processed by the cutting machine can usually reach Ra=0.8μm and above, and the roundness error, linear error and dimensional error of the slow-moving wire cutting machine are much bett...
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What are the rules for metal stamping die scrap tube?

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The Purpose Standardize the management of the scrapping of the company's metal stamping dies, prevent the loss of company assets, and formulate this system specially. Scope of application It is suitable for the management of the company's scrap molds. Definition If the molds listed in the assets of the company fall under one of the following circumstances, the use management department may apply for scrapping. 1. Molds that exceed the specified service life. 2. The mold is severely damaged by accidents or accidents, and molds that cannot be repaired or have no repair value. 3. Metal stamping dies that have not reached the service life, but due to safety, quality, efficiency and other issues, the repair still fails to meet the minimum requirements of the customer's product process or affects the production safety and efficiency. 4. Product customers have stopped placing orders or have not placed orders for molds in several years. 4. Responsibilities 1. Responsibilities of th...
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Introduction of KOVAR parts

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KOVAR parts are commonly used as metal casing materials in the electronic packaging industry. Because they have a linear expansion coefficient close to that of molybdenum group glass, and can produce less sealing stress during the sealing (melting) process with molybdenum group glass, so To obtain good air-tightness, in order to make the metal tube and shell to achieve air-tight sealing, in the entire sealing process, the annealing process undoubtedly plays an important role as a link between the previous and the next. The internal stress generated during KOVAR  machining also prepares the material structure for the implementation of the subsequent process-the sealing process of the metal parts. The main purpose of annealing Kovar shell before sealing is to: (1) Eliminate machining stress. When Kovar undergoes plastic machining deformation during cold working, about 10% to 15% of the applied energy is converted into internal energy, which is commonly referred to as internal stre...
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Selection of LED light drive power

cncmachining September 21, 2022

Selection of LED light drive power

The choice of LED lamp power supply is mainly considered from the output voltage, output current, and corresponding power wattage of the power supply. LED power supply generally has two types of constant current source output and constant voltage source output. First, for the LED power supply output by constant current source, we mainly consider its output voltage. For LED power drivers that output the same current, its output voltage It is also different, so when choosing a constant current LED power supply, it should be consistent with the working voltage of the LED lamp. For example, for a constant current LED power supply with a rated current of 200 mA to 300 mA, its output voltage is between 9V and 13V. The range between 10V and 25V, the range between 24V and 42V, the range between 45V and 63V, etc., so we choose this power supply to consider its output voltage range.

 

   Similarly, for the constant voltage source LED power driver, under the same output voltage, its output current is also different, so when we choose LED power supply, we need to consider its output voltage or current according to different types of LED power supply. . In addition, the power range of the LED power supply should also be considered. If the power range is selected incorrectly, the LED lamp beads will be burned, or the LED lamp will flicker.

 

   For simple LED lamps, it is often used to reduce the voltage through a simple RC resistance-capacitor step-down link, and then arrange it through a diode and add a suitable current-limiting resistor to drive about a dozen high-brightness LED lamp beads. Yes, the lamp beads here can be connected in parallel or in series, but the current limiting resistor must be selected well. For example, the mini LED desk lamp I made before is a power supply formed by this method. I used 12 LED lamp beads in parallel, and used a 2.4 ohm two-watt resistor as the current limiting resistor, and the effect was very good.

 

The LED light has high brightness and saves electricity. Now in order to make LED lights more humane, we can also choose LED power supply with dimming function, such as LED dimming power supply using thyristor, which has high adjustment accuracy and efficiency. If you need to install in a small space, you can choose this LED power supply with dimming function.

 

Some LED power supplies with dimming function are made of MOS tubes, which are also called MOSFET dimmers. It can not only control the on and off of LED lights, but also control the LED lights. Like the LED dimmable power supply made of silicon, the phenomenon of invisible lighting occurs. This kind of LED dimmable power supply can be selected for a single LED lighting lamp or occasions with a small load.

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Copyright Notice: The source of this article is https://ledlight.wiki/

 


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