Frustum Wedge Clamp for Angled Cutting Tool Inserts
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Solution Overview
Problem
Unique insert pocket designs in cutting tools pose a challenge in securely holding cutting inserts, particularly in tight pockets, as conventional clamp screw mechanisms struggle to maintain accurate positioning due to non-perpendicular clamp screw hole orientations.
Innovation Solution
A screw head wedge clamp assembly with a frustum-shaped screw head and a complementary wedge clamp design that engages the insert pocket at three locations – the floor and two side walls – using a tapered angle to lock the cutting insert in place, ensuring secure retention without modifying the insert pocket.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional clamp screw mechanism is used in unique insert pocket designs, then the clamp screw hole cannot be machined perpendicular to the pocket floor, but the cutting insert cannot be securely held in place
Solution Approach 1:
Instead of machining the clamp screw hole perpendicular to the pocket floor (conventional approach), the invention inverts the approach by machining the clamp screw hole at an angle that allows the frustum-shaped screw head to engage the insert at an optimized angle. The screw head contacts the insert at its mounting screw bore, creating effective clamping without requiring perpendicular hole orientation.
Solution Approach 2:
The invention changes the geometric parameters of the clamp screw head by providing it with a frustum shape having specific included angles (e.g., 60-120 degrees). This parameter change allows the screw head to convert the angled clamp screw hole into effective clamping force on the insert, resolving the contradiction between hole orientation and clamping effectiveness.
2Area of stationary object
If the clamp screw head size is reduced to fit tight insert pockets, then the clamping force is reduced, but the screw head must be smaller
Solution Approach 1:
The frustum-shaped screw head with optimized included angles creates a mechanical advantage that allows a compact head size to generate sufficient clamping force. The tapered geometry concentrates the clamping force over a smaller area of the insert, enabling effective clamping in tight pockets without requiring a large screw head.
Solution Approach 2:
The frustum shape with its tapered surfaces creates a wedge effect that multiplies the clamping force. As the clamp screw is tightened, the frustum geometry converts rotational force into linear clamping force with mechanical advantage, allowing compact dimensions to produce adequate holding force.
3Force
If the wedge clamp contacts the top surface of the cutting insert, then additional clamping force is applied, but it interferes with the insert positioning
Solution Approach 1:
The clamp head is designed with a frustum-shaped portion that contacts only the mounting screw bore of the insert, not the top surface. This localized contact at the bore provides sufficient clamping force while avoiding interference with the top surface features that are critical for insert positioning and alignment.
Solution Approach 2:
The clamping function is segmented into two separate contact points: the frustum-shaped screw head contacts the mounting screw bore, and the clamp head contacts the insert at a designated location. This segmentation allows independent optimization of clamping force and positioning accuracy without interference between the two functions.
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 screw head wedge clamp assembly effectively secures cutting inserts in tight pockets by applying downward and rearward forces, ensuring reliable clamping without contacting the top surface of the insert, thus addressing the issue of secure holding in unique pocket designs.
Implementation Method 1
The screw head has a frustum-shaped portion that is formed at an angle with respect to a central, longitudinal axis of the screw head... The tapered angle of the screw head pulls in the cutting insert to lock in place into the insert pocket in three locations
Implementation Method 2
The clamp head has a frustum-shaped portion that is formed at an angle with respect to a central, longitudinal axis of the clamp head... the clamp head is capable of being at least partially received in a mounting screw bore of the cutting insert... the screw head wedge clamp does not contact a top surface of the cutting insert, but only the frustum-shaped portion contacts the mounting screw bore
Implementation Method 3
the location of the clamp screw hole tightens the wedge down into a slot of the insert pocket with the radius at the bottom causing the wedge to further clamp down on the cutting insert
Data Source
AI summary
A screw head wedge clamp assembly for a cutting tool includes a clamp screw having a screw head with a frustum-shaped portion, and a screw head wedge clamp having a body and a clamp head extending from the body. The clamp head has a frustum-shaped portion that is received in a mounting screw bore of a cutting insert. The wedge clamp contacts a radiused bottom wall of the clamp bore when the clamp screw is threaded into a threaded bore of an insert pocket, thereby causing the clamp head to exert a downward and rearward force against a mounting screw bore of the cutting insert to securely hold the cutting insert in the insert pocket. The screw head wedge clamp does not contact a top surface of the cutting insert, but only the frustum-shaped portion contacts the mounting screw bore of the cutting insert.