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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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Hydrostatic guideway of CNC machining lathe

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The static pressure slide rail (TTW guide) of the CNC machining lathe transfers the oil with a certain pressure through the throttle to the oil cavity between the sliding surfaces of the slide rail (TTW guide) to form a pressure oil film to float the moving parts , Make the sliding rail (TTW guide) surface in a pure liquid friction state.   CNC machining General CNC machining usually refers to computer digital control precision machining, CNC machining lathe, CNC machining milling machine, CNC machining c17200   beryllium   copper   and milling machine, etc. The feed route of finishing is basically carried out along the part contour sequence. Therefore, the focus of determining the feed route is to determine the feed route of rough machining and idle stroke. In the numerical control processing, the control system issues instructions to make the tool perform various motions that meet the requirements, and the shape and size of the workpiece are expressed in the form of numbers and lette

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 stress,
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Obviously effective high-speed bearing oil-air lubrication

cncmachining December 25, 2021

Bearings are widely used components in mechanical equipment, roughly divided into sliding bearings and rolling bearings, and their main function is to support shaft parts. Electric spindle bearings are mostly rolling bearings. During use, they need to be equipped with proper lubrication methods to make them fully effective.

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The heating of the electric spindle bearing will affect the machining accuracy and machining efficiency. The electric spindle uses a built-in motor, and the heat dissipation effect is relatively poor. This requires dedicated cooling channels to dissipate heat. The heat comes from two sources: the built-in motor generates heat from rotation and the bearing friction generates heat. The use of oil-air lubrication can eliminate the impact of these two problems. Oil-air lubrication is a gas-liquid two-phase flow. On the one hand, compressed air can take away the heat generated by the rotation of the built-in motor and bearing friction; on the other hand, after the lubricating oil is delivered to the lubrication point, it provides uniform lubrication.

The viscosity of the lubricating oil also affects the temperature: at the same speed, the increase in the viscosity of the lubricating oil will increase the bearing temperature. Lubricants with different viscosities have different changes in bearing temperature. The temperature rise of high viscosity will be greater than that of low viscosity, and with the increase of spindle speed, the trend of temperature rise will become more and more obvious. In actual use, the oil consumption of bearing oil-air lubrication is very small, and only the amount of oil actually needed for bearing operation is needed.

For more questions about the oil and gas lubrication of the electric spindle, please consult Doppy directly.

Link to this article：Obviously effective high-speed bearing oil-air lubrication

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