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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

Urea for vehicles is a heavy-duty diesel vehicle that meets the National IV emission standards

<p style=”margin: 0px; font-family: Times New Roman; line-height: 22px; white-space: normal;”><span style=”margin: 0px; font-size: 14pt;”>Urea for vehicles is A must-have product for heavy-duty diesel vehicles to meet the National IV emission standards. Urea for vehicles refers to an aqueous urea solution with a urea concentration of 32.5% and ultrapure water as the solvent. The raw materials are urea crystals and ultrapure water. For heavy-duty trucks, buses and other diesel vehicles to meet the National IV emission standards, a suitable SCR system must be selected for exhaust gas treatment, and this system must use urea solution to treat the nitrogen oxides in the exhaust gas. Therefore, vehicle urea solution has become an essential product for heavy-duty trucks and buses to meet the National IV emission standards. <br style=”margin: 0px;” />&nbsp;&nbsp;&nbsp;&nbsp; SCR is the best choice for reducing emissions in China. At present, the current domestic diesel national standard GB19147-2009 requires a sulfur content of ≤350ppm, while the ECR-DOC technology requires a sulfur content of oil products below 10ppm, so there is no promotion condition in China for the time being. SCR can withstand 350ppm of sulfur-containing oil, so it has a technical basis for promotion. Because the fuel economy of the National IV engine using SCR technology is better than EGR technology, the engine changes are small, the fuel and oil requirements are lower, the technology upgrade continuity has advantages, the SCR catalyst has good durability and there is no catalyst blockage Therefore, SCR technology is the most suitable technology route for the emission reduction of heavy diesel vehicles in China's national conditions. <br style=”margin: 0px;” />&nbsp;&nbsp; Urea for vehicles is an aqueous urea solution with a concentration of 32.5% and a solvent of ultrapure water. The raw materials for production are urea crystals and ultrapure water. The key point is the purity of the raw materials . From the perspective of the production process, although the purity requirements for the raw material of urea for vehicles are higher than the requirements for general industrial use, the current domestic process can already meet the actual application needs. The production process of automotive urea is not sufficient to build a high barrier to entry. <br style=”margin: 0px;” />  The domestic vehicle urea is mainly purified from industrial urea. The main principles are: 1) When the temperature is 70-75℃, the urea is hydrolyzed in the aqueous solution. 2) When the temperature is below 30°C, urea will crystallize from the aqueous solution again. 3) Each time of hydrolysis and crystallization, its purity will be greatly improved. Generally, once industrial grade urea is used for hydrolysis and crystallization, it can meet the requirements of automotive urea standards, and the output ratio is 1.5:1. <br style=”margin: 0px;” />  Urea for vehicles must use first-class ultrapure water in the electronics industry. Because the SCR catalyst carrier is prone to metal ion poisoning and loses its catalytic effect, the automotive urea solution must use first-grade ultrapure water in the electronics industry (resistivity ≥18MΩ?cm). The car urea solution will start to freeze at -11°C, and it will freeze completely at -20°C in actual use. The current technology is to reduce the freezing point of the solution by adding a modifier, and adding a heating device to prevent the solution from freezing. </span></p><p style=”margin: 0px; font-family: Times New Roman; line-height: 22px; white-space: normal;”><span style=”margin: 0px; font-size: 14pt;”>Urea solution for vehicles (AdBlue) is a solution prepared with high-purity urea without any other additives and pure water. The urea content in the solution is 32.5% (mass fraction). Most domestic and foreign heavy-duty diesel engine manufacturers have adopted SCR (Selective Catalytic Reduction) technology to meet the requirements of Euro IV and Euro V motor vehicle emission standards. Vehicles that choose SCR technology must add urea solution as a catalytic reducing agent to make the vehicle meet the emission standards. <br style=”margin: 0px;” />&nbsp; &nbsp; &nbsp; Diesel engine exhaust gas treatment fluid (commonly known as: automobile urea, automobile urea, automobile environmental protection urea), called AdBlue in China and Europe, and called in America It is DEF and is called ARLA32 in Brazil. AdBlue is a high-purity transparent liquid composed of 32.5% high-purity urea and 67.5% deionized water, with a slight ammonia smell. If it splashes, the water evaporates and crystals form. AdBlue is used in cars, trucks, buses and heavy-duty non-road use diesel engine vehicles equipped with SCR (vehicle selective catalytic reduction exhaust gas aftertreatment) system. It is a consumable that must be used in SCR technology. The harmful nitrogen oxides emitted by diesel engines are converted into harmless water vapor and nitrogen. The main components of the SCR system include catalyst, AdBlue injection device, AdBlue container and AdBlue dose controller. Almost all heavy-duty vehicle manufacturers in Europe, the United States, and Asia, including China, also equip their vehicles with selective catalytic reduction systems and AdBlue working fluids to meet the new nitrogen oxide emission standards (such as Euro 4, Euro 5) AdBlue and Under the combined effect of SCR technology, it can optimize engine performance and fuel consumption, reduce diesel consumption by up to 6%, and significantly reduce costs. The average consumption of AdBlue is 5% of general diesel consumption, which is about 1.5 liters per 100 kilometers of highway driving. AdBlue can only be used to configure the engine combination of the SCR system, because it is neither a fuel nor a fuel additive. AdBlue implements standards in compliance with ISO22241, DIN70070 and CEFIC regulations to ensure the effective operation of the SCR system. AdBlue is not harmful to the environment and is classified as a transportable liquid with the lowest risk. <br style=”margin: 0px;” /><br style=”margin: 0px;” />   At present, domestic automotive urea production is dominated by small and medium-sized private enterprises, and channel sales capabilities are lacking. The domestic automotive urea is mainly produced by enterprises such as Jiangsu Klanso, Liaoning Rundi, Jingmai Chemical, and Beijing Yili. The production capacity of each company is between 100,000 to 300,000 tons per year. Among them, Jiangsu Klanzol and Liaoning Rundi have an annual production capacity of 300,000 tons, and have a series of modifier patents for the problem of low-temperature solidification of urea for vehicles. Jiangsu Klanzo has exported the urea solution for Klanzo vehicles to Russia, Eastern Europe and South America. But for the current small private enterprises, the inability to master the core sales channels is the fundamental weakness of their development. <br style=”margin: 0px;” />&nbsp;Guangdong Chuanghongyu urea energy-saving products came into being. For details, please contact 136 8021 1314&nbsp;</span></p>&lt;div class=”content” style=” margin: 0px;”>&lt;/div>

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