A Method of Envelope Milling for Involute Cylindrical Gears Considering the Accuracy Characteristics of Tooth Surface
A technology of involute cylinder and milling processing, which is applied to components with teeth, belts/chains/gears, gear teeth, etc., which can solve the problem of low processing efficiency, low precision of tooth surface meshing area, and no consideration of tooth surface pitch Problems such as the meshing accuracy of the circle, to improve the processing efficiency and improve the meshing performance
Active Publication Date: 2020-06-05
NANJING GONGDA CNC TECH
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Problems solved by technology
Second, this method of tool path planning based on free-form surfaces does not consider the requirements for meshing accuracy at the pitch circle of the tooth surface.
Although there are five-axis turning-milling compound machining centers in the prior art that can realize the milling of cylindrical gears, the milling form they adopt is to treat the tooth surface as a free-form surface, resulting in a contradiction between machining efficiency and machining accuracy
[0004] Therefore, if the differential geometric characteristics of the tooth surface and the precision characteristic requirements of the tooth surface cannot be considered comprehensively, and only the machining accuracy of the tooth surface is treated according to the same residual height difference, it will inevitably cause a large number of redundant tool passes, resulting in machining Inefficiency, or lack of precision in the meshing area of the tooth flanks
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[0056] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.
[0057] The present invention takes the involute cylindrical gear used in a certain transmission mechanism as an example to describe in detail the enveloping milling method of the involute cylindrical gear of the present invention considering the precision characteristics of the tooth surface. The gear type is straight teeth, and the number of teeth z=44 , modulus m n =20mm, graduated circle pressure angle α n =20,variation coefficient x n =0, tooth width b=160mm, the accuracy requirement is ISO1328-2: 1997 grade 6, among which, the pitch circle accuracy requirement reaches ISO 3 grade. For this gear, when the processing accuracy is ISO 6, the total deviation of the tooth profile is 27.42 μm; when the processing accuracy is ISO 3, the total deviation of the tooth profile...
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Abstract
The present invention provides a method for enveloping milling of involute cylindrical gears considering the precision characteristics of the tooth surface, including S01 selecting a milling tool, determining the diameter of the tool and the length of the cutting edge of the tool; S02 determining the dynamic eccentricity of the tool axis relative to the gear axis e i ; S03 constructs the tooth profile direction tool-feed step length formula, constructs the curve equation between the involute tooth profile expansion angle and the tooth surface residual height difference, and calculates the tool position point; S04 plans the tool-feed path; the present invention ensures that the involute cylinder Under the premise of the machining accuracy of the gear tooth surface, the differential geometric characteristics of the involute tooth surface are considered comprehensively, the tool position is calculated, the tool path is planned, the tool path is allocated according to the needs, and the redundancy of the tooth root and the tooth top is reduced. cutting tool, so as to improve the processing efficiency of the envelope milling gear and the meshing performance of the tooth surface.
Description
technical field [0001] The invention relates to the technical field of mechanical processing, in particular to an envelope milling method for involute cylindrical gears considering the precision characteristics of tooth surfaces. Background technique [0002] Gears are key basic components in machinery-related applications. In recent years, in view of the traditional gear processing methods such as gear hobbing, gear shaping, and shaving, the problems of single-piece small batch, long processing cycle of large-module gear parts, high cost of special gear manufacturing equipment and special gear tools have emerged. A method for flexible envelope milling of cylindrical gears with general-purpose tools on a general-purpose multi-axis machining center can provide a low-cost, high-efficiency, short-cycle processing method for enterprises' single-piece, small-batch and large-module gear processing. And fast-response flexible gear manufacturing method. [0003] However, this adva...
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IPC IPC(8): B23F5/20
CPCB23F5/20G05B19/186G05B2219/45214B23F19/00B23F19/005
Inventor 郭二廓任乃飞周长禄王杰张新洲
Owner NANJING GONGDA CNC TECH