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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 bett...

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 o...

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 o...

The development of lock-up clutches

With the continuous development of automatic transmission technology, only relying on simple hydraulic control or electrical control to engage or disengage the lock-up clutch has exposed many problems. Therefore, the American General Motors Company took the lead in adopting the electronic control of the lock-up clutch in 1891, and other automobile manufacturers soon followed. So far, it can be said that almost all hydraulic lock-up clutches have adopted electronic control.

For the electronically controlled lock-up clutch, the action of the lock-up piston is controlled by the lock-up solenoid valve and one or several sliding plunger valves. When the lock-up occurs or is released, the solenoid valve controls the sliding plunger. The oil pressure signal of the valve action, and the sliding plunger valve really controls the oil pressure that makes the clutch piston engage and disengage. Since the electronic control methods or methods of automatic transmission lock-up clutches of major automobile manufacturers have their own characteristics, a few representative ones are selected and introduced below.

Chrysler Automobile Company's lock-up clutch electronic control

Chrysler Automobiles adopted electronic control of the lock-up clutch in 1986. The hydraulic oil circuit part of the control system, and its lock-up solenoid valve is controlled by the electronic control unit through a lock-up clutch relay. As for the signal sources that the electronic control unit relies on to determine whether to lock or not, they are the cooling water temperature sensor, the vacuum sensor, the vehicle speed sensor, and the throttle closing switch. Normally, only when the engine cooling water temperature is higher than 6o6C, the vehicle speed is higher than 6k4m/h, and the engine intake manifold vacuum is about 26.66-66.66kPa, lock-up can occur. When the engine cooling water temperature indicated by the water temperature sensor rises above 66°C, the electronic control unit can determine whether to lock the lockup clutch in the torque converter according to the signals from the throttle closing switch, vehicle speed sensor and vacuum sensor .

Whenever the throttle closing switch is in the closed state, the electronic control unit will not energize the lock-up solenoid valve and therefore will not lock the clutch. There is no doubt that the function of this switch is to notify the electronic control unit to release the lock of the lock-up clutch. In order to reduce exhaust pollution and increase fuel economy when the throttle is closed and slowing down.

In order to prevent the lock-up solenoid valve from being energized and de-energized repeatedly during the brief opening and closing of the throttle valve, there is a part of the electronic control unit program to ensure that the engagement action of the lock-up clutch is delayed for a given period after the throttle closing switch is turned on. time. 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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