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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

Elimination of Gear Backlash in CNC Machining Feed System

Elimination of Gear Backlash in CNC Machining Feed System   The transmission gear in the feed system of the CNC machining machine tool must eliminate the transmission gap between the meshing gears as much as possible, otherwise the motion will lag behind the command signal after each reversal of the feed system, which will affect the machining accuracy (accuracy) ). There are the following two common methods for CNC machining machine tools to eliminate the transmission gear gap.   1. Rigidity adjustment method   The rigid adjustment method is an adjustment method that cannot be automatically compensated for the tooth side clearance after adjustment. Therefore, the pitch tolerance and tooth thickness of the gear must be strictly controlled, otherwise the flexibility of the transmission will be affected. This adjustment method has a relatively simple structure and a better transmission rigidity.   (1) Eccentric shaft adjustment method   As shown in Figure 610, the gear 1 is mounted on th

Establish a mathematical model of the automobile air-conditioning system

The heat exchanger model library uses this model library, and the user enters the parameters (including the use code of the heat exchanger, the type of the heat exchanger, the structural parameters of the heat exchanger, the material parameters, and the evaporator under the prompts of the software interface of the heat exchanger. After the inlet air volume or the front wind speed of the condenser, the dry and wet bulb temperature of the inlet air, the type of refrigerant, the flow rate of the refrigerant, and the temperature and pressure of the refrigerant at the inlet), calculate the heat exchanger in a given working condition Performance (including the heat transfer of the condenser, the cooling capacity of the evaporator, the pressure drop on the air side and the inside of the tube, and the temperature and pressure of the refrigerant at the outlet); the model library can also calculate the heat exchanger structure separately Changes in parameters, changes in the wind speed or volume of the air at the inlet of the heat exchanger, and changes in the performance of the heat exchanger when the temperature of the air at the inlet of the heat exchanger changes are reflected in the form of a curve. The model library can be used to calculate the relationship curve between the opening and flow of various types of H-type expansion valves and externally balanced expansion valves, providing a reference for users to select expansion valves reasonably.

Liquid storage tank model library Calling this model library can calculate the volume and flow resistance of various types of liquid storage tanks. Provide a reference basis for users to reasonably select liquid storage tanks. The air conditioning system model library reasonably selects the automobile air conditioning refrigeration system based on the heat load value calculated by the heat load model library, the allowable installation space location of the car, and the existing component products, and then establishes the mathematical model of the automobile air conditioning system. The following functions can be realized by using this model library: simulation simulation calculation of simulation bench test; calculation of multiple operation modes can be carried out. It can calculate the known refrigerant charge or the required refrigeration capacity; calculation of multiple connection methods; for a given automobile air-conditioning refrigeration system, the compressor speed, the condenser inlet air temperature or the oncoming Under the conditions of wind speed, variable evaporator inlet air temperature or air volume, the performance of the automobile air-conditioning refrigeration system (such as cooling capacity, power consumption, coefficient of performance, evaporator outlet air temperature, compression ratio, compressor suction temperature and The influence law of pressure, exhaust temperature and pressure) is expressed in the form of curves, so as to provide a reference basis for predicting the matching rationality and working conditions of the automobile air conditioning system. For 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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