Cutting Tool Adjustment Mechanism for Centrifugal Force Stability
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Solution Overview
Problem
Existing cutting tool adjustment mechanisms suffer from inaccuracies due to radial centrifugal forces at high operating speeds and require drilling threaded bores into the tool body, which complicates production and increases costs, especially when using materials like aluminum.
Innovation Solution
A cutting tool with an adjustment mechanism featuring an unthreaded abutment member bore and adjustment bore, where a worm screw with a smaller diameter than the bore diameter is used to adjust the cutting insert's position, minimizing centrifugal force impact and allowing for precise adjustment without the need for threaded bores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional adjustment mechanisms with threaded bores are used, then adjustment functionality is achieved, but manufacturing complexity and production costs increase due to drilling threaded bores into the tool body
Solution Approach 1:
The invention extracts the threading requirement from the tool body by providing the threaded bore in the adjustable component (abutment member) instead. This allows the tool body to have simple unthreaded through-bores, significantly simplifying manufacturing while maintaining the adjustment functionality through the worm screw engaging with the threaded bore in the abutment member.
Solution Approach 2:
Instead of providing the threaded bore in the stationary tool body (traditional approach), the invention inverts the arrangement by providing the threaded bore in the movable abutment member. This inversion simplifies tool body manufacturing while achieving the same adjustment functionality.
2Strength
If threaded bores are drilled into the tool body for adjustment mechanisms, then adjustment is enabled, but material strength is compromised especially in aluminum tool bodies
Solution Approach 1:
The threading is extracted from the tool body and relocated to the abutment member. This allows the tool body to maintain its full structural integrity without threaded holes, while the adjustable component carries the threading that enables adjustment functionality.
Solution Approach 2:
The location of the threaded bore is inverted from the stationary tool body to the movable abutment member. This preserves the strength of the tool body material (especially important for aluminum) while maintaining adjustment capability through the worm screw mechanism.
3Measurement precision
If adjustment screws with radial components are used, then adjustment is achieved, but centrifugal forces at high speeds cause displacement and inaccuracies
Solution Approach 1:
The invention uses a worm screw mechanism where the screw thread engages with the worm screw bore at an angle, creating an asymmetric force distribution that converts rotational motion into precise linear adjustment while minimizing radial force components that would cause displacement at high speeds.
Solution Approach 2:
The invention changes the geometric parameters of the adjustment mechanism by using a worm screw with specific thread geometry and orientation. This configuration allows adjustment while minimizing the radial component of forces, enabling accurate operation at high speeds where traditional radial-adjustment mechanisms would fail.
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 solution reduces inaccuracies caused by centrifugal forces and simplifies production by eliminating the need for threaded bores, enabling accurate cutting insert positioning without the material strength limitations and production complexities associated with aluminum tool bodies.
Implementation Method 1
a worm screw having a worm screw thread, a worm screw end face and a worm screw diameter D WS , with D AB > D WS ; wherein: the abutment member occupies the abutment member bore; the worm screw occupies the adjustment bore with the worm screw thread engaging the worm screw bore formed in the abutment member; and the worm screw is rotatable between: a first screw rotated position in which the abutment member is located in a first position along the abutment member bore axis (M); and a second screw rotated position in which the abutment member is located in a second position along the abutment member bore axis (M).
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A cutting tool (10) has an adjustment mechanism for adjusting the location of a cutting insert (15) seated therein. The cutting tool (10) has a tool body (11) provided with an adjustment bore (50) and an abutment member bore (32) intersecting the adjustment bore (50), and also has an abutment member (30) and a worm screw (40). The abutment member (30) is located in the abutment member bore (32) and the worm screw (40) is located in the adjustment bore (50) and screw threaded into the worm screw bore (56). The abutment member (30) is located in a first location along the abutment member bore (32) when the worm screw (40) is in a first screw rotated position and the abutment member (30) is located in a second location along the abutment member bore (32) when the worm screw (40) is in a second screw rotated position.