Simulating and processing method for tooth shape of large-module less-tooth number gear

Abstract

The invention discloses a simulating and processing method for the tooth shape of a large-module less-tooth number gear. The method comprises the steps of simulating a cutting process, simulating a processing environment, determining a processing cutter, guiding a simulation procedure out, processing a sample, adjusting the processing parameters, and determining the processing procedures. According to the invention, a positioning hole is milled between two adjacent teeth in advance, and the milling allowance between the positioning hole and the outer profile curve of the gear is 1-3mm, so when the tooth root of the gear is milled, cutting amount accumulation cannot be caused when a milling cutter is turned, and the processing quality of the gear is improved. When the simulating and processing method for the tooth shape of the large-module less-tooth number gear is used for processing the gear, the processing time of each tooth is 0.5h, and the method is greatly improved in the monomer gear processing efficiency compared with the efficiency of average 13.8h for processing each tooth in the linear cutting processing.

Description

technical field [0001] The invention relates to the technical field of electromechanical integrated numerical control machining, in particular to a gear tooth profile simulation and processing method with a large modulus and a small number of teeth. Background technique [0002] At present, the commonly used gear tooth processing methods in China include "fan Cheng method" (such as gear hobbing, gear shaping, etc.) and "profiling method" (such as milling teeth); in special cases, there is also "wire cutting method". In foreign countries, in addition to the above methods, the "five-axis linkage gear machining center" is also used to process the tooth profile. [0003] When the "Fan Cheng method" is used to process gears, when the number of teeth is less than 17, the phenomenon of "undercutting" will occur. The number of teeth of the road wheel is generally less than 14. Leaving aside the manufacturing difficulty and cost of large modulus hobs (or gear shaper cutters), only f...

AI Technical Summary

Problems solved by technology

However, WEDM also has the following disadvantages: 1. There are axial WEDM lines on the surface of the tooth shape, which will lead to stress concentration, resulting in a decrease in the bearing capacity of the walking wheel, making it a risk of early failure; and the finish is low (Ra6. 3um)

2. Wire EDM uses the instantaneous high temperature of electric spark (8000~12000℃) to melt, oxidize and corrode the local metal, and the metallographic structure of the tooth surface will change, which will affect the quality and stability of the gear.

3. Long processing cycle and poor delivery timeliness

Since the "five-axis linkage gear machining center" adds two rotation axes (generally A-axis, C-axis) to the three-axis (X-axis, Y-axis, Z-axis) of the general machining center, and it is necessary to purchase a professional tooth profile milling simulation program software, which is very expensive

Images