Barrel-Shaped Worm-Like Tool Dressing for Internal Gear Grinding
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Solution Overview
Problem
The existing methods for grinding internal gears using barrel-shaped worm-like grindstones often result in unequal wear and irregular grinding loads due to the engagement of the grindstone's cutting edge with the tooth profile of the gear, leading to reduced machining accuracy and increased vibrations in transmissions.
Innovation Solution
A method involving a dressing tool with fewer teeth than the internal gear to be machined, which engages the barrel-shaped worm-like tool at the same axis intersection angle, allowing for a grindstone with a smaller pitch circle diameter and radius at the ends, reducing machining load and unequal wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a dressing gear with the same number of teeth as the internal gear is used, then the grindstone can be dressed to match the gear specifications, but unequal wear and irregular grinding loads occur due to improper engagement with the tooth profile
Solution Approach 1:
The patent changes the key parameter of the dressing gear from having the same number of teeth as the internal gear to having fewer teeth. This parameter change modifies the engagement characteristics between the dressing gear and the barrel-shaped worm-like tool, resulting in a grindstone with optimized pitch circle diameter and radius at the ends, which eliminates unequal wear and irregular grinding loads while maintaining high machining accuracy
2Force
If the grindstone diameter is reduced at the ends to reduce machining load, then unequal wear decreases, but the engagement with the tooth profile becomes more critical
Solution Approach 1:
The patent optimizes the geometric parameters of the grindstone by using a dressing gear with fewer teeth, which creates a grindstone with smaller pitch circle diameter and radius at the ends. This parameter optimization reduces the machining load while the specific engagement angle and tooth configuration ensure proper engagement with the tooth profile, maintaining manufacturing precision
Data Source
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AI summary
Provided is a method of making a barrel-shaped worm-like tool whereby a barrel-shaped worm-like tool capable of efficiently performing grinding without unequal wear can easily be made. The aforementioned method comprises making the barrel-shaped worm-like tool (12) by using a dressing gear (11) to dress the barrel-shapedworm-like tool (12), which is used for machining an internal gear and has a diameter that gradually increases from the ends (12b, 12c) to the center (12a) in the axial direction. On the basis of data wherein the number of teeth is less than that of the internal gear to be machined, the dressing gear (11) and the barrel-shaped worm-like tool (12) are engaged with each other at the same axial intersection angle as during gear-machining performed by the barrel-shaped worm-like tool (12).