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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 better t
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How Do Cnc Swiss Machines Work

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How Do Cnc Swiss Machines Work Save 0 What Is Swiss Machine –The full name of the walking CNC lathe, it can also be called the spindle box mobile CNC automatic lathe, the economical turning and milling compound machine tool or the slitting lathe. It belongs to precision machining equipment, which can complete compound  machining such as turning, milling, drilling, boring, tapping, and engraving at one time. It is mainly used for batch  machining of precision hardware and special-shaped shafts. This machine tool first originated in Germany and Switzerland. In the early stage, it was mainly used for precision machining of military equipment. With the continuous development and expansion of industrialization, due to the urgent needs of the market, it was gradually applied to the  machining of civilian products; the development of similar machine tools in Japan and South Korea Earlier than China, it was mainly used in the military industry in the early days. After the war, it was gradually
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Spring Design Attention And Roll Forming Method

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Spring Design Attention And Roll Forming Method The coiling characteristics and methods of springs are divided into cold coiling method and hot coiling method. Cold winding method: When the diameter of the spring wire is less than 8mm, the cold winding method is adopted. High-quality carbon spring steel wire is usually first cold drawn and then heat treated. After winding, it is generally not quenched, but only tempered at low temperature to eliminate the internal stress during winding. Hot-rolling method: Springs with larger diameter (>8mm) spring wire should use hot-rolling method. Hot rolled springs must be quenched and tempered at medium temperature. The Design Process Of Various Springs ·          Installation space: When designing a  compression spring , it is necessary to have a clear understanding of the space required for the installation of the spring, in order to effectively grasp the basic manufacturing conditions of the compression spring, including the outer diam
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Several factors affecting the embrittlement of speed-regulated cooling fans

cncmachining September 20, 2022

Several factors affecting the embrittlement of speed-regulated cooling fans

 

 The embrittlement of the speed-adjustable cooling fan means that it is easy to break. If the equipment frame or fan blade is broken, the fan is basically scrapped. It is prone to accidents when it is broken during work, and it has to be taken seriously. The embrittlement of the speed-regulated DC cooling fan is caused by the following factors: long-term operating temperature, fan speed ratio, power switching frequency, rotor dynamic balance of the fan motor rotor, fan structure direction and dust or dirt in the natural environment.

The brittleness of the speed-adjustable cooling fan means that it is easy to break. If the equipment frame or fan blade is broken, the fan is basically scrapped. It is prone to accidents when it is broken at work, and it has to be taken seriously. The embrittlement of the speed-regulated cooling fan is caused by the following factors: long-term operating temperature, fan speed ratio, power switching frequency, rotor dynamic balance of the fan motor rotor, fan structure direction and dust or dirt in the natural environment.

 

1. Working temperature: The temperature of the fan office environment will endanger the evaporation and viscosity of the grease, thus endangering the service life of the power cooling fan.

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2. Fan speed ratio: The AC coling fan speed ratio is inversely proportional to the service life. The higher the speed ratio, the higher the temperature caused by the friction of the grease liquid, which will accelerate the evaporation of the grease and reduce the service life of the bearing.

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3. Power switching frequency: When the oil bearing starts, no oil wedge is produced, and the shaft core and bearing are still in contact with metal materials, which will cause slight damage. Therefore, frequent power switching can also endanger bearing life.

 

4. The rotor dynamic balance of the fan motor rotor: the better the rotor dynamic balance of the fan Blower motor rotor, the smaller the centripetal force caused by the same speed ratio, the less damage to the bearing, and then the service life of the bearing will increase.

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5. Fan structure direction: Due to the difference in the fan structure field, the influence of force on the bearing will also be different. In the basic theory, the force of the motor rotor on the bearing has minimal ground stress when the direction of the deceived gravity is parallel to the bearing.

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6. Dust or dirt from the outside: After entering the bearing, the dust in the air will block the air intake system of the bearing, destroy the original dynamic pressure oil film and lubrication of the oil bearing, and cause failure. If the external dirt is chemical fibers or insects, it will also hinder the rotation of the centrifugal impeller.

 

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