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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

The control problem of electronically controlled clutch

  The automatic clutch of the vehicle can automatically perform the separation and combination operation according to the driving conditions of the vehicle and the driver’s intention to realize semi-automatic shifting. The control performance of this clutch directly affects the longitudinal comfort and fuel economy of the vehicle. Therefore, studying the control problems of electronically controlled clutches has important industrial application value. Generally speaking, the control of the clutch has to solve two problems: one is the coupling law of the clutch; the other is the actuator tracking the coupling law. Therefore, the entire controller is divided into an upper-level controller and a lower-level controller. Shen Shuiwen and others discussed the upper-level controller to solve the problem of the coupling law of the clutch. Due to the non-linearity, time lag, external interference, parameter perturbation and other influences in the system itself, it is difficult for the lower-level controller to track the clutch engagement law. In this paper, a sliding mode variable structure controller is designed, which adopts switching function leading compensation method to reduce chatter vibration. Motor-driven clutch actuator modeling DC brushless motor position servo system, which includes two controllers, an inner loop and an outer loop. The inner loop system is a pulse width modulation power inverter controlled by a sinusoidal current; the outer loop is a variable structure The controller is used to generate control signals and input the inner loop. In the figure, x is the reference displacement of the clutch release bearing, which represents the ideal coupling law of the clutch, which is proposed by the upper controller, that is, the clutch controller; the DC brushless servo motor is a three-phase permanent magnet synchronous motor. It is worth mentioning that the diaphragm spring plays an important and special role in the clutch. Due to its special structure, it also functions as a separation lever and a compression spring. At the same time, its special non-linear characteristics can reliably transmit torque after the friction plate of the driven disc is worn, and make the pedal easy to operate.

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