Spindle Housing Roughness for Quieter Dental Prosthesis Machining
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Solution Overview
Problem
Dental prosthesis processing devices generate high-frequency noise due to the high-speed rotation of spindles, which deteriorates the working environment and causes discomfort to users.
Innovation Solution
A dental prosthesis processing device with a spindle mounting part that includes a roughened portion inside the spindle mounting housing to diffusely reflect and cancel out the noise generated by the rotation of the motors and spindles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the spindle rotates at high speed to process high-hardness materials, then the machining capability is improved, but high-frequency noise is generated that deteriorates the working environment
Solution Approach 1:
The patent applies the principle of converting harm into benefit by transforming the harmful high-frequency noise generated by the high-speed spindle into a beneficial outcome. A roughened portion is formed on the inner surface of the spindle mounting housing to diffusely reflect noise waves, converting the harmful concentrated noise into beneficial diffuse reflections that cancel out the noise, thereby reducing the overall noise level while maintaining the high-speed machining capability
Solution Approach 2:
The patent applies dimensionality change by introducing surface roughness (a micro-scale dimensional feature) on the inner surface of the housing to address the noise problem. The roughened portion creates multiple reflection paths for noise waves in different directions, effectively dispersing the noise energy in the acoustic dimension while preserving the mechanical function of the high-speed spindle
2Productivity
If a dual spindle structure is used to increase processing efficiency, then productivity is improved, but the noise level increases significantly
Solution Approach 1:
The patent applies this principle by using the roughened inner surface of the housing to convert the harmful noise from dual spindles into beneficial diffuse reflections. The multiple noise sources from two spindles are transformed into scattered sound waves that interfere destructively, reducing the overall noise level while maintaining the high productivity benefit of the dual spindle configuration
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
The device effectively reduces high-frequency noise, creating a more comfortable working environment by diffusely reflecting and canceling out noise within the spindle mounting housing.
Implementation Method 1
a roughened portion (40) that diffusely reflects noise generated by rotation of the motors (20a and 20b) and spindles (10a and 10b)
Data Source
AI summary
A device for processing a dental prosthesis with reduced noise includes one or more spindles that are rotationally driven by one or more motors; machining tools that are mounted on axis ends of the spindles to rotate together with the spindles; a spindle mounting part that is driven in up-down and left-right directions, and on which the motors and the spindles are mounted; and a workpiece mounting part on which a workpiece is fixedly mounted, and driven in a front-back direction. The spindle mounting part includes a spindle mounting housing in which the motors and spindles are mounted in its internal space, and one or more bearings that are mounted inside the spindle mounting housing to rotatably support the spindles, and a roughened portion that diffusely reflects noise generated by rotation of the motors and spindles is formed inside the spindle mounting housing.