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Working principle of slow wire processing

 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

How Do Cnc Swiss Machines Work

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

Spring Design Attention And Roll Forming Method

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

The simplified radiator model is more suitable for engineering calculations

In the actual design of automobile radiators, it is necessary to comprehensively consider heat transfer performance, resistance performance, economy and reliability. The model simplification simplifies the heat dissipation belt with louvered fins into multiple rectangular parallelepiped porous media regions. Due to the thin wall and large area of ​​the radiator tube studied, the radiator tube wall is simplified into a double side wall surface of corresponding thickness to reduce the number of solid meshes and reduce the coupling heat transfer in the cold and hot sides of the radiator. Calculate the workload. The simplified radiator model is more suitable for engineering calculations. The creation and meshing of the watershed structure is used to complete the meshing of the radiator calculation model. After the simplified radiator core part and the air flow area structure are relatively regular, the hexahedral structured grid is generated by the division method.

The water chamber part of the radiator uses a division method. Setting of boundary conditions. Inlet boundary conditions: According to the control method of the entrance test conditions in the heat transfer wind tunnel test of the automobile radiator, the air inlet and the water inlet adopt the speed entrance, and the speed direction is perpendicular to the entrance plane. According to the entrance measured by the test The data is set for speed and temperature. Outlet boundary conditions: pressure outlet boundary conditions are used for both the water outlet and the air outlet. The static pressure and “backflow” conditions need to be defined on the pressure outlet boundary. The “backflow” condition is the boundary condition used when a backflow occurs at the pressure outlet boundary. Wall boundary conditions: Because all the walls of the studied radiator are static, there is no surface chemical reaction, and radiation is ignored, so this article mainly sets the thermodynamic boundary conditions on the wall. Because strict thermal insulation is carried out in the heat transfer wind tunnel test, it is assumed that the outer wall of the air channel and the outer wall of the water are adiabatic walls, that is, the heat flux is set to be. According to the simplification of the radiator model, the wall of the water pipe becomes a double-sided wall surface with corresponding wall thickness. Only by coupling the front and back sides in the calculation, the solver can directly use the flow field variables of the adjacent grid to calculate the wall surface. The heat exchange.

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