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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

Hydrostatic guideway of CNC machining lathe

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

Classification of CNC Machining Occupation Levels

1. Blue-collar layer:   That is, CNC machining operation technicians, proficient in machining and CNC machining process knowledge, proficient in the operation and manual programming of CNC machine tools (attributes: automated machine tools), understand automatic programming and simple maintenance of CNC machine tools (attributes: automated machine tools), such There is a large market demand for personnel, and they are suitable for operating workers of CNC machine tools (attributes: automated machine tools) in the workshop, but due to their single knowledge, their wages will not be much higher.   2. Gray collar layer:   One, CNC machining programmer:   Master the knowledge of 5 Axis CNC machining Aluminum   technology and the operation of CNC machine tools (attributes: automated machine tools), be familiar with the design and manufacturing expertise of complex molds (title: mother of industry), and be proficient in 3D CAD/CAM software, such as UG, GOOGLE PRO/E, etc. ; Familiar with CNC

Insufficient tightening of wire joints in air-conditioned passenger cars

  With the rapid development of China’s railway passenger transport industry, new types of centralized power supply and fully air-conditioned passenger trains are gradually replacing old-type passenger trains, and have now become the main body of all-track inter-office direct passenger trains. In recent years, fire accidents and dangers caused by the electrical system of air-conditioned passenger trains have occurred frequently, and the vehicle department has also discovered a large number of electrical fire hazards in the maintenance and operation of air-conditioned passenger cars. Fire accidents, dangers, and hidden dangers have brought many adverse effects on the normal transportation and production of railways. How to grasp the regularity of electrical fires in air-conditioned passenger cars and improve the ability to prevent and control passenger car fires has become the focus, difficulty and key point of current passenger car fire safety. The author talks about some superficial views on this. The main reason for the frequent occurrence of electric fire hazards in air-conditioned passenger cars: the diversity of voltage systems, electricity consumption and power generation in air-conditioned passenger cars greatly increases the probability of electric fire hazards. Ordinary 22 type non-air-conditioned passenger cars have simple electrical systems, as well as lighting fixtures, air-conditioning systems, electric tea stoves, video broadcasts, warm water tanks, electronic display screens, axle temperature alarms, refrigerators, dining car exhaust fans and other electrical facilities and electrical loads Large, there are many electrical connection points. Single-section air-conditioned passenger cars are powered by their own diesel generator sets; most of the entire train of air-conditioned passenger cars are powered by generator cars, with two main transmission lines, which are AC three-phase four-wire power supply systems. The application of complex transmission and distribution systems and a large number of electrical facilities and equipment has increased the probability of failures. Some air-conditioned passenger cars are not in place in accordance with regulations and standards when they are newly built and repaired, leaving a hidden fire hazard. First of all, through analysis of the causes of air-conditioned passenger car fires and fire insurance cases that have occurred throughout the road in recent years, it is found that there are many problems such as electrical equipment failures and poor insulation of air-conditioned passenger cars due to low quality of new construction and factory repairs, and they are extremely harmful. Specifically, the laying of electrical lines did not meet the requirements of the Ministry of Railways “Railway Passenger Car Wiring Rules”. Some newly-built air-conditioned passenger cars have problems such as insufficient tightening of wire joints, different circuits on the top of the passenger car, and wires of different voltage levels are bundled together, and no protective wire sleeves are added, and the power line length margin is too large.

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