Dental Fitting Body Milling With Deep Cuts and Low Tool Wear
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Solution Overview
Problem
Current methods for producing dental fitting bodies are limited by slow machining speeds and short tool life due to small volumes removed per unit time and high stress on cutting tools, necessitating low forward feed rates and shallow cutting depths.
Innovation Solution
The method involves using a tool with defined cutting edges and a cutting arc angle of less than 90°, allowing for higher insertion depths and orthogonal or inclined tool paths to increase machining efficiency and prolong tool life, while also enabling deeper cutting without specialized tools and reducing wear on the tool tip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional grinding methods are used with small insertion depths and low forward feed rates, then tool life is extended and machining precision is maintained, but machining speed is limited and productivity is low
Solution Approach 1:
The patent applies parameter changes by increasing the insertion depth to at least twice the tool diameter (compared to conventional shallow cutting) and increasing the forward feed rate to at least 4 mm/sec (compared to conventional low feed rates). These parameter changes enable significantly higher material removal rates while maintaining acceptable tool life through the specific cutting arc angle control.
2Productivity
If high insertion depths and high forward feed rates are used, then machining speed and productivity are increased, but stress on cutting tools increases and tool life decreases
Solution Approach 1:
The patent resolves this contradiction by optimizing multiple parameters simultaneously: increasing insertion depth to ≥2x tool diameter, increasing forward feed rate to ≥4 mm/sec, and controlling the cutting arc angle to ≤90°. This combination of parameter changes achieves high productivity while maintaining tool reliability through the specific cutting geometry control.
Solution Approach 2:
The patent applies partial or excessive action by using an insertion depth that is at least twice the tool diameter, which is deeper than conventional cutting. This excessive insertion depth, combined with the controlled cutting arc angle, enables higher material removal rates while managing tool stress through the optimized cutting geometry.
3Productivity
If conventional milling paths following the contour are used, then machining precision is maintained, but machining speed is limited due to tool engagement constraints
Solution Approach 1:
The patent applies inversion by using a cutting arc angle of less than 90°, which is smaller than conventional cutting angles. This inverted approach to tool engagement allows the tool to cut more efficiently with reduced engagement time, improving productivity while maintaining precision through the optimized cutting geometry.
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 approach significantly increases machining speed and extends tool life by allowing greater volumes to be removed per unit time and enabling deeper cuts without excessive wear, improving the efficiency and effectiveness of the dental fitting body production process.
Implementation Method 1
a workpiece from which the fitting body or preform is produced is machined in a material-removing manner by means of a tool that engages into the workpiece with one or a plurality of cutting edges arranged on a circumferential surface of said tool
Data Source
Figure 1~3
Figure 2B~4B
Figure 5A~7B
AI summary
In the method for producing medical, in particular dental fitting bodies 3 with a specified or custom three-dimensionally curved outer contour 3.1 or preform of the fitting body 3 with a rough outer contour, which has an allowance relative to the outer contour, a workpiece 2, from which the fitting body 3 or its preform is produced, is machined in a material-removing manner by means of a tool 5 engaging in the workpiece 2. The tool path 1 has directional components transverse to the run of the contour 3.1 to be produced and the cutting edges 8 have a defined geometry. The tool 5 engages into the workpiece 2 at a cutting arc angle alpha of the circumferential surface 7 of less than 90° on average and at an insertion depth (ta, tb, tg) of at least twice the tool diameter (D) and the machining of the workpiece 2 occurs along a tool path 1 with directional components contrary to a machining direction following the outer contour (3.1). A workpiece has a recess, in which a machining tool is positioned prior to the machining occurring essentially via its circumferential surface.