Tool Connecting Section Groove Embossing via Radial Stamping
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Solution Overview
Problem
Existing methods for producing connecting sections for tools like drills and chisels are inefficient due to high material consumption, long production times, and deformation issues during forming processes, which lead to increased costs and potential fractures under high loads.
Innovation Solution
A method involving embossing with radially movable deformable bodies in a closing die to create longitudinal grooves without preforming, allowing for precise shaping and reduced axial forces, while using a spring-loaded punch to limit elongation and prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cutting machine tools are used to manufacture connecting sections, then manufacturing precision can be achieved, but material consumption increases due to chips and production time becomes relatively long
Solution Approach 1:
The patent replaces cutting machine tools with a stamping device that uses radial infeed of deformable bodies to emboss longitudinal grooves directly into the connecting section. This substitution of mechanical cutting with plastic deformation through stamping eliminates chip generation and significantly reduces production time while maintaining manufacturing precision
2Stability of the object's composition
If longitudinal grooves are closed by upsetting, then groove closure is achieved, but the grooves are deformed and cannot fulfill their function
Solution Approach 1:
The patent replaces the upsetting process with a stamping process using radially infeed deformable bodies. This substitution allows the longitudinal grooves to be embossed and closed without the deformation and material flow issues that occur during upsetting, thereby maintaining groove shape accuracy and functionality
3Stability of the object's composition
If the end face is upset to close grooves, then groove closure is achieved, but material folds occur and can lead to fractures under high loads
Solution Approach 1:
The patent replaces the upsetting process with stamping using radially infeed deformable bodies. This eliminates the material folding and defect formation that occurs during upsetting of the end face, thereby preventing potential fracture initiation sites and improving the reliability and fracture resistance of the connecting section
4Manufacturing precision
If filling bodies are introduced into grooves to maintain shape during compression, then groove shape is maintained, but considerable axial forces are required for closing
Solution Approach 1:
The patent replaces the combination of groove formation followed by upsetting with a direct stamping process using radially infeed deformable bodies. This substitution eliminates the need for filling bodies to maintain groove shape during compression, as the radial embossing process inherently maintains groove geometry while requiring significantly lower forces
5Force
If hot or semi-hot forming is used to close grooves, then axial forces are reduced and drill blank ejection problems are avoided, but additional cost-intensive heating work step is required
Solution Approach 1:
The patent replaces hot or semi-hot forming with a cold stamping process using radially infeed deformable bodies. This substitution achieves low force requirements and avoids drill blank ejection problems through the radial embossing mechanism, eliminating the need for heating equipment and associated costs
6Stability of the object's composition
If longitudinal grooves are preformed before upsetting, then groove formation is achieved, but the end face becomes heavily corrugated with burrs that deform during upsetting
Solution Approach 1:
The patent replaces the two-step process of preforming grooves followed by upsetting with a single stamping process using radially infeed deformable bodies. This substitution eliminates the heavy corrugation and burr formation on the end face that occurs during preforming, as the radial embossing process directly creates the final groove geometry without intermediate deformation
7Force
If dividing manufacturing of locking grooves into several work steps is done, then force requirements per step are reduced, but device complexity and production costs increase
Solution Approach 1:
The patent combines the formation of longitudinal grooves and their closure into a single stamping operation using radially infeed deformable bodies. This merging of operations into one work step maintains low force requirements through the radial embossing mechanism while eliminating the need for multi-stage presses and reducing device complexity
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 simplifies the production process, reduces material defects, and enhances durability by enabling embossing with higher material strengths, allowing for efficient and cost-effective manufacturing of connecting sections with precise groove formation.
Implementation Method 1
the at least one longitudinal groove is embossed by radial infeed of one or more deformable bodies movable in the closing die
Implementation Method 2
A preferred distance of the punch from the end surface of the connecting portion before stamping is between 0.2 mm and 4.0 mm
Data Source
Figure 1
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Figure 8~11
AI summary
The invention relates to a method and a device for manufacturing a connecting section (100) provided with an end surface (106) as part of a tool, in particular a drill bit or chisel axially movable in the tool holder of a rotary hammer, or as part of a connecting rod, wherein the connecting section (100) has at least one longitudinal groove (122), at least one of which is at least partially closed towards the end surface (106) of the connecting section. The invention further relates to a semi-finished tool, a drill bit, a chisel, or a rod, and a device for manufacturing a connecting section (100). In the method, a semi-finished drill bit (102) or a rod with a substantially cylindrical or polygonal, in particular square, circumferential surface (104) is provided. Furthermore, the connecting section (100) is inserted into a closing die (128).In addition, the at least one longitudinal groove (122) is formed by radially adjusting one or more forming bodies (134) movable in the closing die (128), thereby causing an elongation of the connecting section (100) and a reduction in the cross-sectional area in the area of the longitudinal groove.