Drilling Tool Attached Cutting Element Welding
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Solution Overview
Problem
Existing drilling tools require a large volume of material for secondary cutting elements due to the need for deep embedding to transmit shear forces, which increases material usage without ensuring high quality or reliability.
Innovation Solution
The secondary cutting element is designed as an attached cutting element composed of multiple weld beads welded onto the base body, eliminating the need for a form fit for shear force transmission and allowing for a significant reduction in material usage while maintaining quality and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large volume of material is used for the cutting element to ensure deep embedding for shear force transmission, then the connection reliability is improved, but the material usage increases
Solution Approach 1:
The patent replaces the mechanical connection system (positive fit for shear force transmission) with a welding system. The attached cutting element is connected to the base body through welding processes that create metallurgical bonds, eliminating the need for deep mechanical embedding while maintaining or improving connection reliability.
Solution Approach 2:
The patent changes the connection method from mechanical (positive fit) to thermal/metallurgical (welding). This parameter change in the connection mechanism allows for reduced material volume while maintaining strength, as welding can create stronger bonds than mechanical interference fits without requiring large embedding depths.
2Strength
If deep embedding is used to transmit shear forces, then the connection strength is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent replaces complex mechanical embedding structures with simpler welding processes. Instead of designing and manufacturing complex interference fit features, the solution uses welding to create strong connections, reducing manufacturing complexity while maintaining or improving connection strength.
Solution Approach 2:
The patent extracts the shear force transmission function from the mechanical embedding structure and transfers it to the welding connection. This separation allows the cutting element to be attached with minimal embedding depth while the welding process provides the necessary strength for shear force transmission.
3Reliability
If a positive fit is used for shear force transmission, then the connection reliability is improved, but the material volume requirement increases
Solution Approach 1:
The patent substitutes the mechanical positive fit system with a welding system. The attached cutting element is welded to the base body, creating a reliable connection without requiring the cutting element to have large volume for embedding. The welding process provides the necessary bond strength independently of the cutting element's volume.
4Quantity of substance
If multiple welding operations are used to attach the cutting element, then the material usage is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent segments the cutting element into multiple weld drops or layers, attaching them in sequential welding operations. This segmentation allows for reduced material usage per layer while achieving the required total connection strength through cumulative welding, managing precision requirements across multiple smaller operations rather than one large complex operation.
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 reduces material requirements by up to 50% without compromising the drilling tool's performance, enabling efficient production with adaptable geometry and simplified logistics.
Implementation Method 1
The attached cutting element is welded to a surface section of the base body of the working head at individual weld points
Data Source
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AI summary
The invention relates to a drilling tool (1) intended to act on a material to be treated, comprising a work head (2) which comprises a main body (3) made of a first material (W1), a cutting element (SE4) configured as a primary cutting element (4) and made of a second material (W2), and at least one cutting element (SE5, SE6) configured as a secondary cutting element (5, 6; 17, 18, 22, 23) and made of a third material (W3), wherein the second and the third materials (W2, W3) are harder than the first material (W1). At least one cutting element (SE4, SE5, SE6) is configured as an attached cutting element (SEA5, SEA6) and assembled with at least two welding points (7), and said attached cutting element (SEA5, SEA6) is welded at separate welding points (7) on a surface section (8, 9) of the main body (3) of the work head (2), in particular while avoiding positive locking with the main body (3), which positive locking is capable of transmitting a shearing force. The invention further relates to a method for producing a drilling tool (1).