Variable Turbine Geometry Guide Blade Joint Machining
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Solution Overview
Problem
Variable turbine geometries in charging devices, such as exhaust gas turbochargers, face inefficiencies due to manufacturing tolerances that result in varying gaps between guide blades and cover discs, preventing optimal minimization of these gaps and thus affecting the power output.
Innovation Solution
The method involves inserting and jointly machining guide blades in a blade mounting ring to minimize manufacturing tolerances, ensuring precise machining of end sides to reduce gaps between guide blades and cover discs, thereby enhancing power and efficiency by maintaining consistent spacing during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If guide blades are manufactured separately and then assembled into the blade mounting ring, then manufacturing flexibility is improved, but manufacturing tolerances cause varying gaps between guide blades and cover disc
Solution Approach 1:
The guide blades are pre-assembled into the blade mounting ring before the final machining operation. This preliminary assembly allows the blades to be positioned in their final locations, and then the end sides of all blades are jointly machined to achieve a common reference plane, ensuring consistent gaps with the cover disc while maintaining manufacturing flexibility
Solution Approach 2:
The machining operation is merged to process multiple guide blades simultaneously. By jointly machining the end sides of at least two guide blades in the mounted state, the patent creates a common reference plane across all blades, ensuring uniform gaps with the cover disc and compensating for individual blade manufacturing tolerances
2Loss of energy
If the gap between guide blades and cover disc is minimized to improve efficiency, then power output increases, but manufacturing tolerances prevent optimal gap minimization
Solution Approach 1:
The joint machining operation creates a feedback mechanism where the machining process itself establishes the final gap dimension. By machining the guide blades in their mounted positions, the actual gap distance becomes a direct result of the machining operation rather than being dependent on cumulative tolerances from separate manufacturing steps, enabling optimal gap minimization for flow efficiency
3Ease of manufacture
If guide blades are machined individually before assembly, then manufacturing simplicity is improved, but assembly complexity increases to achieve consistent spacing
Solution Approach 1:
The patent inverts the conventional sequence by assembling the guide blades into the mounting ring first, and then performing the final machining operation on the assembled unit. This inversion simplifies the machining process (as blades are already positioned) but requires careful assembly planning, which is offset by the fact that the blades can be inserted into the ring before final positioning machining
Data Source
AI summary
A method for producing a variable turbine geometry of a charging device may include inserting at least two guide blades into a blade mounting ring. The method may then include jointly machining at least two of the guide blades, in the mounted state, on respective end side of the at least two guide blades facing away from the blade mounting ring in order to produce a final shape of the end sides.