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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

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

Analysis on the Research of Automobile Liquid Nitrogen Drive System

Regarding the research of automotive liquid nitrogen drive system, there are mainly the following aspects.

System circulation research: LN2000 system and CoolN2Car system are the representatives of current liquid nitrogen driving system circulation research. Both are circulation systems that only use liquid nitrogen as the energy storage medium. The working principle is to use liquid nitrogen as the working fluid in the open Rankine cycle, exchange heat in the ambient air heat exchanger, and perform work in the expander.

The main components of the LN2000 system are: low temperature Dewar, cryogenic pump, main heat exchanger, economizer, expander, etc. But the efficiency of the system is only 0.2miles/gallon (about 85km3), and the speed is low, only 22miles/h (about 35.4km/h).

The principle of the LN2000 circulation system is: the liquid nitrogen is sent from the low temperature Dewar to the economizer (preheater) by the cryogenic pump. After being heated by the discharged nitrogen in the economizer, it enters the main heat exchanger, is heated by air, and the pressure rises. High, enter the expander to do work. The exhausted nitrogen returns to the economizer to heat the liquid nitrogen.

LN2000 system and CoolN2Car system are all circulating systems that use liquid nitrogen as the energy storage medium, but they face the following three problems:

①The energy is only provided by the ambient air, and the heat exchange rate is slow;

②The surface of the heat exchanger is easy to be frosted;

③It is highly dependent on the external air environment. Therefore, from a practical point of view, such a system has low power, slow speed, and unstable operation.

Research on the expansion process: The research on the expansion process, theoretically, the specific work* obtained by isothermal expansion is greater. Isothermal expansion is to keep the temperature of the expanding gas constant during the expansion process, but such an expander is difficult to design. The actual isothermal expander has not yet been manufactured. Therefore, there is research on the quasi-isothermal expansion process.

The automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

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