Threaded Chuck Assembly for Vibration-Stable Structural Steel Drilling
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Solution Overview
Problem
Existing chuck and cutting tool assemblies are not well-suited for machining structural steel, as they experience vibrations leading to reduced drill lifetime and bore quality due to the shape of workpieces like T beams and double-T steel beams.
Innovation Solution
A chuck with a tool-receiving socket and a cutting tool featuring a radial clamping mechanism, including a screw thread and contact surfaces, which provides axial strain and frictional torque transmission to stabilize the cutting tool, preventing excessive tightening and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cutting tool is clamped only by friction in the tool-receiving socket, then the tool can be easily exchanged, but the tool stability is insufficient and vibrations occur during cutting
Solution Approach 1:
The patent combines two coupling mechanisms: frictional coupling through the tool-receiving socket and form coupling through the screw thread. This merging allows the system to achieve both easy tool exchange (via simple friction insertion) and high stability (via the additional screw thread connection that prevents vibrations during cutting).
Solution Approach 2:
The screw thread acts as an intermediary element that provides additional stabilization without interfering with the primary friction-based clamping mechanism. It mediates between the need for easy tool exchange and the need for vibration-free cutting by providing a secondary coupling path.
2Reliability
If the screw thread is tightly fastened to increase tool stability, then vibrations are reduced, but the screw thread experiences excessive tightening and wear
Solution Approach 1:
The screw thread provides partial stabilization rather than complete clamping. By using the screw thread only for stabilization and not for primary clamping, the tightening force is reduced to a level that prevents vibrations without causing excessive wear, extending the service life of the screw thread.
Solution Approach 2:
The clamping function is segmented into two parts: the tool-receiving socket handles the primary clamping through friction, while the screw thread handles only the stabilization function. This segmentation allows the screw thread to operate at lower, less wear-inducing force levels.
3Reliability
If the cutting tool is strained axially with the chuck, then the contact surfaces are tightly seated and stability is improved, but the screw thread may be over-tightened
Solution Approach 1:
The patent changes the functional parameter of the screw thread from primary clamping to secondary stabilization. This parameter change allows the axial strain to be applied through the tool-receiving socket while the screw thread only provides contact surface seating without excessive tightening, reducing wear.
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 design enhances the stability and precision of the cutting process, extends the tool's lifespan, and allows for easy exchange, while maintaining high-quality machining of structural steel.
Implementation Method 1
the tool shaft is frictionally torque-transmittingly clamped in the tool-receiving socket
Implementation Method 2
a screw thread designed so as to be coaxial with the tool-receiving socket and into which a mating screw thread of the cutting tool can be screwed
Implementation Method 3
the mating contact surface of the cutting tool and the contact surface of the chuck act as support surfaces that stabilize the cutting tool and thus suppress vibrations
Data Source
AI summary
An assembly comprises: a chuck, which has a tool-receiving socket, a contact surface, and a screw thread; and a cutting tool, which has a tool shaft, a mating contact surface, and a mating screw thread. In a clamped state, the mating screw thread of the cutting tool is screwed into the screw thread of the chuck, the mating contact surface of the cutting tool is seated against the contact surface of the chuck, and the tool shaft is frictionally torque-transmittingly clamped in the tool-receiving socket. The invention also relates to a chuck of this type and to a cutting tool of this type.