Punching Tool Cutting Line Cold Formed Recesses
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Solution Overview
Problem
Existing punching tools face challenges in automatic trimming due to complex production of recesses and adjustable deformation paths, leading to reduced tool life, fatigue fractures, and suboptimal cut quality, especially in machines with insufficient plane-parallelism.
Innovation Solution
A thermally treated and/or thermally hardened steel strip cutting line with a convex cross-section back part featuring recesses and elevations formed through cold forming, allowing for adjustable plastic deformation and reduced material expansion, enhancing tool life and cut quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If recesses are created by precise machining (grinding, milling), then automatic trimming is enabled, but production complexity increases
Solution Approach 1:
The patent replaces traditional mechanical machining methods (grinding, milling) with a cold forming process using a forming element that plastically deforms the back part material. This substitution simplifies production by eliminating complex machining operations while achieving the same functional result of creating deformable recesses for automatic trimming.
Solution Approach 2:
The patent changes the material state and deformation parameters by applying cold forming at controlled temperatures and pressures. By adjusting the forming force, temperature, and material composition, the process creates plastically deformable regions without requiring precise machining, thus reducing production complexity while enabling automatic trimming.
2Ease of operation
If edge decarburization is applied to facilitate plastic deformation, then automatic trimming is improved, but material strength is reduced
Solution Approach 1:
The patent applies local quality by creating decarburized zones only in specific regions of the back part where plastic deformation is needed, while maintaining the original material composition and strength in other areas. This localized treatment allows automatic trimming in critical zones without compromising the overall material strength of the cutting line.
Solution Approach 2:
The patent segments the cutting line into different functional zones: the back part with decarburized regions for deformation, and the cutting edge area with full material strength. This segmentation allows each zone to have optimized properties for its specific function, enabling both automatic trimming and high strength where needed.
3Shape
If material expansion exceeds strip thickness, then deformation is achieved, but tool precision and plate damage increase
Solution Approach 1:
The patent applies partial action by limiting the material expansion to less than the full strip thickness during cold forming. This controlled partial deformation achieves sufficient shape change for automatic trimming while preventing excessive expansion that would compromise tool precision or damage the plates.
4Adaptability or versatility
If undeformed areas are made plastically deformable, then automatic trimming adaptability improves, but tool life decreases due to fatigue fractures
Solution Approach 1:
The patent applies local quality by creating plastically deformable regions only in specific areas of the back part that require adjustment, while maintaining high-strength, fatigue-resistant material properties in the cutting edge and other critical load-bearing areas. This localized softening enables automatic trimming adaptability without compromising overall tool life.
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 solution enables economical and efficient production of cutting lines with improved automatic trimming, reduced fatigue, and enhanced cut quality by allowing for adjustable force distribution and compressive stresses, preventing cracking and fractures.
Implementation Method 1
a thermally treated and/or thermally hardened steel strip
Implementation Method 2
recesses formed in places transverse to the longitudinal extension and perpendicular to the side surfaces without cutting by cold forming or embossing with free expansion of the material
Implementation Method 3
the undeformed areas between the depressions a commissioning of the tool are plastically deformable
Data Source
Figure 1~2a
Figure 3~4
Figure 5~6b
AI summary
The invention relates to a punching tool (1), in particular a cutting line (1), for dividing or perforating planar materials and to the production of the tool. In order to create a punching tool (1) having improved characteristics, in particular for automatic finishing in a flatbed punching machine and/or rotary punching machine, the punching tool (1) is formed from a heat treated and/or quenched and tempered steel strip, on the narrow sides of which a back part (2) is formed on one side, the back part having a contour that is convex in the cross-section or a contour comprising several projecting convex areas (21, 2'), said contour having recesses (4) in some places, said recesses being formed transversely to the longitudinal extension and perpendicularly to the side surfaces by cold forming or stamping with no chip formation and with free expansion of the material, wherein the extent of the expansion (B) is less than the thickness (D) of the steel strip, and the undeformed areas between the recesses can be plastically deformed during the commissioning of the tool.