I produce high speed hob, M3, double headed, pressure angle 20 degrees, machined gear Z11 and Z9 gear. The normal line changes momentum 0.06~0.1 and does not dare to shave teeth. I analyze the reasons: long hob processing, less gear, gear inappropriate: in theory inappropriate. The machining tolerance is accumulated; the vibration is large; the accuracy of the hob; the accuracy of the gear hobbing machine. So far, I haven't solved it completely. But I told the gear factory to use the same hob to gear the Z43 gear, which is obviously much better. I hope you can correct me.
Scraping the general process, scraping hob hob - modulation ---- carbide hob scraping. The general amount of stay, such as M5, usually leaves about 0.4. However, alloy hob is more valuable. Scraping hob must have roots, otherwise easily jump alloy hob tooth. Just say that.
N1Z1=N2Z2, your machine tool is really high-speed machine tools, not only hob can high-speed, and even the workbench is so high speed, running HIGH
The accuracy of the rotary table of the gear hobbing machine is large, or the deviation of the concentricity between the small column head and the worktable is too large. The first step is to check the gear hobbing machine workbench precision spindle work station is equipped with a standard, do not try to play the top hat, mandrel, preferably with micrometer, if the mandrel in the beating of a point always hit the minimum (minimum can reach 0.003), always in 0.015~0.03 between swing dancing. Sometimes more than 0.03, the surface of the worktable shell and the surface of the cone must be overhauled. If the core shaft can be positive, it is on the top of the top, a core shaft on the two beat, normal upper and lower deviation but over 0.015, such as the top is not so, that column with the table concentricity deviation is too large, to correct the small column. That is, double headed cutter processing, less gear, gear, public wire, there is momentum, but there is no landlord said so big ah. No more than 0.03. It is also important to check the accuracy of hobbing machines and gear blanks.
The number of teeth of the theory is not suitable to duotou hob tooth number, use 9-11 double thread hob, usually duotou hob is to improve work efficiency, and processing precision will be relatively lower is certain, usually will be reflected in the pitch, what equipment you use, and your equipment speed of working table can handle? Personal comments are for reference only
