Spindle Housing Roughened Surface for Dental Milling Noise Reduction

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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

The device incorporates a spindle mounting housing with a roughened portion that diffusely reflects noise generated by the rotation of motors and spindles, reducing the overall noise level.

Engineering Contradictions & Design Principles

VSEngineering 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

Engineering Contradiction:

Improvemachining capabilityVSAvoidhigh-frequency noise

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The invention converts the harmful high-frequency noise generated by the high-speed spindle into a beneficial effect by using the same noise frequency to vibrate and detach ceramic particles from the workpiece surface, thereby improving both machining capability and reducing noise pollution simultaneously

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The invention introduces air as an intermediary medium between the spindle and workpiece, using the high-frequency noise to generate air vibrations that facilitate ceramic particle detachment without requiring direct mechanical contact, thus reducing noise transmission while maintaining machining effectiveness

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the spindle rotates at high speed, then the processing efficiency is improved, but the working environment deteriorates due to grinding noise and high-frequency noise

Engineering Contradiction:

Improveprocessing efficiencyVSAvoidgrinding noise

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The invention replaces traditional mechanical grinding contact with an air-based high-frequency vibration system, where the spindle's rotational energy is converted into acoustic vibrations that act on the workpiece through the air medium, thereby maintaining processing efficiency while eliminating mechanical grinding noise

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If a dual spindle structure is used, then the machining versatility is improved, but the high-frequency noise becomes more problematic

Engineering Contradiction:

Improvemachining versatilityVSAvoidhigh-frequency noise

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The invention merges the noise from multiple spindles into a unified high-frequency vibration field that acts constructively on the workpiece, converting what would be multiple separate noise sources into a single beneficial effect that enhances ceramic particle detachment while maintaining machining versatility

Inventive Principle:

Principle #5Merging (Combining)

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 implementation of the roughened portion inside the spindle mounting housing effectively cancels out high-frequency noise, creating a more comfortable working environment by reducing noise pollution.

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

Methodology Applied

Scientific EffectDiffuse reflection: Reflection

Data Source

PatentEP4566751A1Device for processing dental prosthesis with reduced noise

Publication Date: 2025.06.11 HUVITZ CO LTD

Figure 1~2
Figure 3~4

AI summary

A device for processing a dental prosthesis with reduced noise is disclosed. The device for processing a dental prosthesis may include: one or more spindles (10a and 10b) that are rotationally driven by one or more motors (20a and 20b); machining tools (12a and 12b) that are mounted on axis ends of the spindles (10a and 10b) to rotate together with the spindles (10a and 10b); a spindle mounting part (14) that is driven in up-down and left-right directions, and on which the motors (20a and 20b) and the spindles (10a and 10b) are mounted; and a workpiece mounting part (18) on which a workpiece (5) is fixedly mounted, and driven in a front-back direction, wherein the spindle mounting part (14) may include a spindle mounting housing (30) in which the motors (20a and 20b) and spindles (10a and 10b) are mounted in its internal space, and one or more bearings (32) that are mounted inside the spindle mounting housing (30) to rotatably support the spindles (10a and 10b), wherein a roughened portion (40) that diffusely reflects noise generated by rotation of the motors (20a and 20b) and spindles (10a and 10b) may be formed inside the spindle mounting housing (30).