Automotive Gear Manufacturing Technology

Gear manufacturing technology:

Gear cutting and precision according to different structures require different processes. View of the large investment in equipment, process methods usually give full consideration to the choice of existing resources. Gear processing technology of small deformation and stability control is relatively complex, mostly to be used after rough forging isothermal normalizing, in order to obtain good performance and trends of the deformation process uniform microstructure: low speed for less precision cylindrical gear can be hot before shaving and heat is no longer processing: processing of cylindrical gears under conditions of heat Qi teeth and grinding teeth have different ways of selection, clarity tooth profile correction of low cost but weak, high precision grinding, but the high cost: repair edge and the crown gear modification technology to significantly reduce noise and improve the transmission gear engagement performance, currently being widely used. Straight bevel gear is mainly used for low accuracy because of the speed differential is relatively low, the current recommended forging gear. Spiral bevel gear machining and machine adjustment calculation, the past is very complex and time-consuming manual operation has been modern-specific software and computer programs replaced by the introduction of finite element analysis and making the process more reliable and convenient parameter design: heat processing spiral bevel gears there are two kinds of lapping and grinding, grinding teeth because of the high cost, low efficiency and limitations of the currently most used lapping, lapping geometry of the amendment is weak, so the spiral bevel gear driven gear to use more pressure carburization quenching process. Gear materials and heat treatment technology is the control of deformation processing gear challenging task.

Gear Cutting in the simultaneous development of measurement technology to improve the level of gear manufacturing as important. Traditional geometric measurement and comprehensive measurement methods as well as coordinate the development of technology, the emergence of gear measuring center in the measurement accuracy, efficiency, range and other aspects have been greatly improved. Tooth-shaped surface profile measurement space become a reality, such as geometric entities cylindrical gear easily accessible numerical model for the spiral bevel gear tooth profile is difficult to obtain accurate surface before the actual model, is now able to achieve for a variety of shows such as boundary conditions, material PSN curve, heat treatment, the friction factor and other key performance data can be obtained through the pilot testing, and for lubrication, temperature, relative slip velocity and some other important data still need to get in-depth research.

Automotive parts as gears working conditions because of its complexity and uncertainty, not simply by virtue of the precision and the other is to have accurate measurement and analysis methods and means. At present, many domestic manufacturers already have the gear to carry out in-depth study of the conditions.

Divided into top gear tooth modification modification known as tip relief and root modification, Shen cut, committed to addressing the root meshing gear tooth tip and interference problems: to solve hobs, shaving cutters, arc tooth cutter wheel design and trimming. Modification to the main control tooth bearing contact area location and expansion of the state and compensation for changes in temperature cause the helix angle, depending on the purpose and conditions can be used both ends of the modification, the whole tooth modification to the line, drum gear modification, etc. by shaving machines, spiral bevel gear grinding machine and milling machine tool tilt adjustment is completed. The main problem is a reasonable modification of the method validation parameters need to be studied and the experimental basis for modification is not sufficient, the need to establish a viable and continue to improve standards and specifications.

Mechanical parts, gears relatively complex and high manufacturing costs, the pursuit of precision to ensure high performance is the direct consequence of the practice is neither scientific nor reasonable cost. Gear modification methods rely on basic research shaving, milling, grinding and other major process equipment function expansion, can be called "parasitic process", does not require a large investment in technology costs, improve through targeted modification of the use of gear performance, on the one hand to play as much as possible the potential of the gear itself, on the other hand a reasonable choice of gear production control accuracy, reduce process costs. In-depth study of the application of cost-effective technology for improving gear meaning is obvious.