Casing Inner Turning for Balanced Machining of Nozzle Protrusions
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Solution Overview
Problem
Large casings with protruding nozzles experience imbalance during high-speed turning processing due to centrifugal forces, leading to reduced processing accuracy and increased processing time.
Innovation Solution
A manufacturing method where the casing forming member is prepared with a tubular casing body and protruding nozzles, then placed on a rotatable table with a tool rotating at a higher speed than the table, allowing for cutting of the inner surface while the table and tool rotate, thereby reducing centrifugal forces and maintaining balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the table rotation speed is increased to reduce processing time, then productivity is improved, but centrifugal force increases causing imbalance and reduced manufacturing precision
Solution Approach 1:
The patent introduces a counterweight that rotates together with the table at the same speed but in the opposite direction to the table rotation. This counterweight generates a centrifugal force that opposes and balances the centrifugal force produced by the workpiece, thereby eliminating imbalance and vibration even at high rotation speeds, enabling both high productivity and high manufacturing precision
2Manufacturing precision
If the table rotation speed is decreased to maintain balance, then manufacturing precision is maintained, but productivity deteriorates due to increased processing time
Solution Approach 1:
By introducing the counterweight mechanism, the system can rotate at high speeds without compromising manufacturing precision. The counterweight balances the centrifugal forces, allowing the table to rotate fast enough for efficient processing while maintaining the precision required for accurate cutting
3Adaptability or versatility
If the workpiece is designed with protruding nozzles for functional requirements, then adaptability is improved, but imbalance occurs during high-speed rotation reducing manufacturing precision
Solution Approach 1:
The counterweight mechanism specifically addresses the imbalance caused by protruding nozzles on the workpiece. By rotating in the opposite direction at the same speed, the counterweight generates opposing centrifugal force that cancels out the imbalance from the nozzles, enabling high-precision processing of functionally complex casings with multiple protruding elements
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 method enables efficient processing of large casings with reduced imbalance and processing time, ensuring high accuracy by controlling the relative speed between the tool and the casing surface.
Implementation Method 1
a distal end of the tool is pressed against an inner circumferential surface of the workpiece. As a result, the inner circumferential surface of the workpiece which rotates around the vertical axis is moved relative to the distal end of the tool, and the inner circumferential surface of the workpiece is subjected to cutting
Implementation Method 2
In a case in which the table is rotated at high speed for the turning processing on such a workpiece, a large centrifugal force acts on the workpiece in an eccentric state due to the suction nozzle or ejecting nozzle which is a heavy object
Data Source
AI summary
A manufacturing method of a casing includes a step of preparing a casing forming member that includes a casing body forming portion which is formed in a tubular shape and a protruding portion forming portion which protrudes from the casing body forming portion toward an outer side in a radial direction, a step of placing the casing forming member on a table which is rotatable about a table axis which extends in a vertical direction and disposing a tool which is rotatable about a tool axis on an inner side of the casing forming member in the radial direction, and a step of forming the casing by performing cutting an inner circumferential surface of the casing forming member with the tool while rotating the table about the table axis together with the casing forming member and rotating the tool about the tool axis.