Gear Helix Artifact Lapping for Equal Common Normal Accuracy
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Solution Overview
Problem
Current gear helix artifacts do not meet the requirements of the Chinese national standard GB/T 6468-2010 for Class-1 accuracy, particularly in machining and measurement due to the lack of effective machining methods and devices for gear helix artifacts with equal common normal, which are crucial for high-precision gear manufacturing.
Innovation Solution
A lapping device for gear helix artifacts with equal common normal by rolling method, comprising a whetstone component, baffle component, multi-ball bearing plate, whetstone driven component, rotary table, and spring clamp with guide pillar, which allows precise adjustment of the whetstone's angle and linear motion to achieve high-precision machining of involute helicoids with consistent helix angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional machining methods are used for gear helix artifact, then the manufacturing process is simpler, but the manufacturing precision cannot meet Class-1 accuracy requirements
Solution Approach 1:
The patent introduces a whetstone as an intermediary lapping tool between the machining system and the gear helix artifact. This whetstone component enables precise surface finishing and helix angle correction without requiring the entire machining system to achieve Class-1 accuracy directly, thereby resolving the contradiction between manufacturing precision and device complexity
Solution Approach 2:
The patent changes the machining parameter from direct cutting to lapping with controlled normal forces. By adjusting the lapping parameters (whetstone angle, normal force magnitude and direction) and using equal and opposite normal forces from two whetstones, the system achieves Class-1 accuracy while maintaining manageable device complexity
2Measurement precision
If the tooth width and involute length are increased to meet Class-1 standards, then the measurement precision improves, but the difficulty of machining and measurement increases significantly
Solution Approach 1:
The gear helix artifact with equal common normal is designed to serve its own measurement function through its symmetric tooth structure. The equal and opposite normal forces applied during lapping automatically cancel out, providing self-balancing that simplifies the measurement and machining process while maintaining Class-1 accuracy requirements for tooth width and involute length
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device ensures high-precision machining of gear helix artifacts with Class-1 accuracy by accurately controlling the helix angle and machining length, canceling out normal forces during machining to improve lapping accuracy and meet the standards for Class-1 gear helix artifacts.
Implementation Method 1
a lapping device for gear helix artifact with equal common normal by rolling method
Implementation Method 2
based on the principle that as a plane rolling around the base-circle cylinder, the trajectory swept with a straight line at a certain acute angle with the axis of the base cylinder on the plane is an involute helicoid
Data Source
AI summary
A lapping device for gear helix artifact with equal common normal by rolling method, use the rotary table to accurately control the angle between the lapping surface of whetstone and the axis of the base-circle cylinder to control the helix angle of base-circle about the involute helicoid. Use the whetstone driven component to drive the whetstone to make a high-precision linear motion in the vertical direction to adjust the position of the lapping surface of whetstone. The distance between the two lapping surface of whetstone is precisely adjusted by the gauge block to control the processing length of the three tooth common normal of the gear helix artifact. The invention provides a lapping device for gear helix artifact with equal common normal by rolling method, it conforms to the generation principle of the involute helicoid, and there is no machining principle error.