The Technology Of Numerical Control Reconstruction On The Injection Nozzle Center Hole And Inner Cone Grinder

The valve of ejection nozzle is an important part in the diesel engine; its processing quantity will directly affect the amount of the oil usage and the exhaust let off by diesel engine. For small aperture ejection nozzle, especially to the P serial type that the center hole diameter is 4mm, its center hole and inner cone is always adopting imported Numerical Control machine to grind. But an imported Numerical control grinder needs about 0.5 million dollars, most domestic companies can not offer it.In the paper, it mainly discusses how through redevelopment technique on the homemade open type Numerical Control System to successfully reconstruct an old hydraulic injection nozzle center hole and inner cone grinder, and make this declining machine obtain excellent capability. The important is that the expenses used on technical reconstruction only is 1/5 of an new importing equipments, but its processing quantity is almost equal to the importing equipments, completely can satisfy with the rigor craft request of the ejection nozzle's precision.At first, The paper analyses the craft request on the valve of ejection nozzle processing, and the new status on the domestic and international processing, then puts forward the significance that making use of Numerical Control technology to reconstructing the old machine. Under the classic automatically control theorist's leading, the thesis establishes idiographic practice methods that using closed loop open type Numerical Control system to reconstruct the old hydraulic injection nozzle center hole and inner cone grinder. The paper, being around with the whole technical reconstruction process, chooses each parts of control system that can satisfy with request, and designs PLC software controlling the grinding process, and G_code grinding program. What is more, through taking anti- interference measure and parameter optimizing settle, it guarantees the machine function's stability and optimizing. At the same time, in the paper ,it brings up a creative new "skipping the chosen row " function , satisfying the needs of the grinding procedure, completing the whole item mission of reforming, and realizing the whole grinding process automatization. At the Last of the paper, by contrasting the performance of the reconstructed machine with importing machine, and measuring the produced workpiece, it finds that the rate of eligible production attain to 94 percent, and shows that the reconstructed machine is no less than the imported machine in performance, which supplies a gap on tooling small aperture ejection nozzle.This item successfully completed under scheduled. One hand, it breaks the customary practice of only using foreign Numerical Control System to equip with high precision machine,escapes the hard problem that it is difficult to self redevelop in limited time by using foreign Numerical Control System, and resolves the problems that it needs convenience in manipulation and high precision in grinding. On the other hand, Numerical Control technical reconstruction, as a high new technology, it provides a both matching the national policy and reliable method for our reducing the margin between developed countries, advancing the pace owning Numerical Control machine, and changing the behind productive status. It has the vast of market foreground, and immense economic benefits social benefits.