3D Casing Bolt-Hole Interference Check for Creep Deformation
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Solution Overview
Problem
The issue of creep deformation in steam turbine casings leads to misalignment of bolt holes, making it difficult to properly fasten the upper and lower half parts, potentially causing steam leakage and assembly issues due to increased thermal deformation from high main steam temperatures.
Innovation Solution
An assembly interference determination device and method using three-dimensional measurement to assess the shape of bolts and bolt holes in the casing halves, determining the presence or absence of interference based on acquired data to ensure accurate assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the upper half part is fastened to the lower half part after inspection work, then the casing can be reassembled, but creep deformation causes misalignment of bolt holes making proper fastening difficult
Solution Approach 1:
The patent performs preliminary three-dimensional measurement of the bolt and bolt hole shapes before assembly to predict and determine potential interference issues in advance, allowing for preventive measures to be taken before the actual fastening operation
Solution Approach 2:
The patent replaces traditional mechanical trial-and-error assembly methods with a computational approach using three-dimensional measurement data and interference determination algorithms to predict assembly feasibility
2Power
If thermal deformation amount increases due to ultra-high main steam temperature, then power generation efficiency improves, but bolt hole inclination and interference problems worsen
Solution Approach 1:
The patent uses three-dimensional measurement data to provide feedback on the actual deformation state of the casing and bolt components, enabling determination of interference conditions based on measured geometric parameters
Solution Approach 2:
The patent changes the approach from preventing thermal deformation to measuring and adapting to the actual deformation parameters that occur under ultra-high temperature conditions
3Ease of manufacture
If the bolt main body has only a small margin with respect to the bolt hole, then assembly is simpler, but interference occurs more easily with deformation
Solution Approach 1:
The patent performs preliminary three-dimensional measurement and interference determination before assembly to identify potential problems with small clearance, allowing for advance planning rather than encountering issues during actual assembly
Data Source
AI summary
An assembly interference determination device for a casing that includes a lower half part and an upper half part that are to be fastened to each other includes: a three-dimensional measurement data acquisition unit configured to acquire three-dimensional measurement data by three-dimensionally measuring a shape of a bolt disposed in one of the lower half part and the upper half part and a shape of a bolt hole disposed in the other of the lower half part and the upper half part; and an interference presence/absence determination unit configured to determine presence/absence of interference between the bolt and the bolt hole based on three-dimensional measurement data acquired by the three-dimensional measurement data acquisition unit.