Machining Method of Hardened Tooth Surface of Medium Precision Large Modulus Cylindrical Gear

Abstract

A method for processing a hard tooth surface of a medium-precision large-modulus cylindrical gear is characterized in that a double-parameter non-instantaneous-pole enveloping method is carried out to perform tooth surface generating enveloping and hard milling, namely, a cutter is used for performing weft enveloping along the circumference contour direction of the gear and then performing warp enveloping along a helical line direction of the tooth surface of the gear. According to the method, a large-diameter disc milling cutter, which is provided with a large-space chip storing groove and is high in cutting stiffness and convenient and reliable in blade fixing manner, is utilized, so that a cutter disc is outstanding in comprehensive high-speed hard milling performance; a coated carbide blade is used for achieving high-speed hard milling of hardened steel; the form of the geometric structure of the blade can effectively improve the dynamic stiffness and thermal stiffness and can also reduce the influence of force and heat on a workpiece and the blade, and as a result, the durability of the blade can be improved.

Description

technical field [0001] The invention relates to the technical field of numerical control machining, in particular to a method for finishing the hardened tooth surface of medium-precision large-module cylindrical gears. Background technique [0002] Medium-precision large-modulus cylindrical gears usually refer to gears with a modulus greater than 12 and a precision of about GB7. The current processing methods mainly include: [0003] Gear hobbing (shaping) + heat treatment. This kind of process has high production efficiency, low cost, and good economy. However, the heat treatment process causes gear deformation, and it is difficult to grasp the deformation law, and the pre-correction amount of the tool is not easy to control, so that the gear accuracy may be greatly reduced, and it is difficult to ensure mass production. GB7 level accuracy Hardened gears are usually used as a pre-process for other finishing methods. [0004] Gear hobbing (shaping) + heat treatment + grind...

AI Technical Summary

Problems solved by technology

The widely used CNC form gear grinding machine or CNC worm wheel gear grinding machine is special equipment for gear grinding, which is expensive and the cost of grinding process is very high. It is usually used in gear processing occasions requiring high precision, but for hard The overall economy of surface processing is poor, so it is difficult to popularize and apply

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