Toothed Ring Pre-toothing and Heat Treatment
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Solution Overview
Problem
The existing methods for manufacturing toothed rings, particularly those with significant tooth height, result in mechanical property deviations and reduced strength at the tooth base, necessitating an enhancement in this region.
Innovation Solution
A method involving the introduction of a pre-toothing with a reduced first tooth height into a ring blank, followed by heating, quenching, and tempering, and subsequent finish-toothing to increase the tooth height, thereby enhancing the heat treatment effect and strength at the tooth base, using metal cutting processes like milling and heat treatment techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the toothing is introduced by metal cutting after heat treatment of a seamless rolled ring blank, then the ring can be produced with the required geometry, but the strength in the region of the tooth base is significantly reduced
Solution Approach 1:
A pre-toothing is introduced into the ring blank before heat treatment by means of a metal cutting process. This preliminary toothing has teeth with a first tooth height that is smaller than the final desired tooth height. The pre-toothing creates a pre-toothed ring blank that undergoes heat treatment, allowing the tooth base region to achieve enhanced strength properties before the final toothing is cut to the full depth.
Solution Approach 2:
The toothing formation is divided into two separate operations: a first metal cutting process that creates the pre-toothing before heat treatment, and a second metal cutting process that finishes the toothing to the final depth after heat treatment. This segmentation allows the heat treatment to affect the tooth base region positively while still achieving the required final geometry.
2Force
If the tooth height is significant, then the gear capacity is increased, but larger deviations of mechanical properties occur between tooth base and tooth tip
Solution Approach 1:
The pre-toothing is created before heat treatment with a reduced tooth height, allowing the heat treatment process to uniformly affect the entire ring including the tooth base region. After heat treatment, the ring is finished to the full tooth height. This preliminary action ensures that the tooth base region develops consistent mechanical properties throughout the ring before the final geometry is established.
Solution Approach 2:
The tooth height parameter is changed in two stages: first to a smaller value for the pre-toothing that undergoes heat treatment, then to the final larger value after heat treatment. This parameter change strategy allows the heat treatment to uniformly affect the material properties throughout the ring while still achieving the required large final tooth height for adequate gear capacity.
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
This approach leads to a homogenized distribution of strength values from the tooth tip to base, significantly improving the mechanical properties at the tooth base and ensuring the ring's durability for applications in large gearings and roller bearings.
Implementation Method 1
heating, quenching and tempering of the pre-toothed ring blank
Implementation Method 2
heating, quenching and tempering of the pre-toothed ring blank
Implementation Method 3
heating, quenching and tempering of the pre-toothed ring blank
Data Source
AI summary
A method for producing a ring with a toothing may involve (a) ring rolling a pre-ring to form a ring blank, (b) introducing a pre-toothing into the ring blank to form a pre-toothed ring, wherein the pre-toothing has teeth with a first tooth height, (c) heating, quenching, and tempering the pre-toothed ring to form a heat-treated pre-toothed ring, and (d) finish-toothing the heat-treated pre-toothed ring to form a ring with a toothing. The toothing may have teeth with a second tooth height that is greater than the first tooth height. Further, the introducing of the pre-toothing or the finish-toothing of the heat-treated pre-toothed ring may be performed by way of a metal machining process.