Imported CNC machine tools have been widely used in the machining industry, especially in the oil pump nozzle industry, due to their remarkable high precision and high efficiency in machining. However, in the use of imported machine tools, the problem of serious shortage of maintenance spare parts is faced, resulting in a long fault repair cycle, which makes the production unable to proceed normally, and the production efficiency is reduced. The original intention of selecting imported machine tools cannot be achieved. In order to change the status quo, let the import The machine tool restores its high precision and efficiency, and it is a very effective, practical and sustainable way to carry out localization of imported equipment.
Yituo Company is a company that produces oil pump nozzles. With the development of production, CNC machine tools and high-efficiency precision equipment are used more and more widely. In the early 1990s, Yituo Company introduced three U80 grinding machines from Swedish UVA company. It is used to machine the middle hole and seat surface of the needle body of the injector PB86J. The process requirements are extremely strict: the roundness is required to be within 0.5 μm, the cylindricity is required to be within 0.8 μm, the surface roughness value is required to be below 0.4 μm, and the ground parts can be directly mated. The grinding rod of the machine tool is directly mounted on the electric spindle. Therefore, the running precision of the electric spindle is extremely high. The rotation speed of the electric spindle is required to be 100000r/min, which is driven by the inverter. The machine is highly efficient and has a single machining time of 50 s, which is the key equipment to ensure production. Due to the use for many years, the fault has increased significantly in recent times, especially the inverter that drives the electric spindle, the operation is extremely unstable, and it has reached a high period of failure. The inverter cannot be repaired due to various objective conditions. The original equipment inverter has been eliminated, no spare parts are supplied, and the purchase of substitute products is expensive. Each unit needs about RMB 200,000, and the supply period is long, which seriously restricts the smooth progress of production and must be reformed.
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A RECTIFIER BRIDGE CAN CONTAIN 3, 6, OR SOMETIMES 8 DIODES DEPENDING ON ITS DESIGN. DIODES ARE LIKE ONE WAY CHECK VALVES THAT ALLOW CURRENT TO FLOW IN ONLY ONE DIRECTION. A POSITIVE BIASED DIODE ALLOWS ONLY POSITIVE VOLTAGE TO PASS THROUGH AND A NEGATIVE BIAS DIODE ALLOWS ONLY NEGATIVE. THE BRIDGE'S JOB IS TO CONVERT AC VOLTAGE TO DC VOLTAGE. THIS PROCESS IS KNOWN AS RECTIFICATION. IT ALLOWS THE POSITIVE VOLTAGE TO PASS ONTO THE BAT+ TERMINAL AND ONTO THE BATTERY, WHILE ALLOWING NEGATIVE VOLTAGE TO PASS TO THE GROUND. MOST ALTERNATORS HAVE 3 OR 6 DIODES. IF ONE OF THESE FAIL, IT WILL REDUCE ALTERNATOR OUTPUT BY APPROXIMATELY 1/3.
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RECTIFIER ASSEMBLY. THE RECTIFIER ASSEMBLY CONSISTS OF SIX DIODES MOUNTED
EITHER IN THE REAR HOUSING OR IN A SEPARATE SMALL HOUSING CALLED A RECTIFIER
BRIDGE. THREE OF THE DIODES ARE CONNECTED TO GROUND, AND THREE ARE MOUNTED
IN AN INSULATOR. SINCE THE MOUNTING ASSEMBLY CARRIES OFF HEAT CAUSED BY THE
OPERATION OF THE DIODE, IT IS OFTEN CALLED A HEAT SINK.
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