Local Heating for High L/D Ratio Piercing
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Solution Overview
Problem
Piercing apparatuses face challenges in achieving high productivity and work quality when punching holes with large L/D ratios, as existing methods either result in punch buckling or inferior dimensional precision and surface quality.
Innovation Solution
A piercing apparatus that uses local heating to soften the workpiece below its melting point, allowing a columnar punch to pierce the hole with reduced deformation resistance and without the need for a die, while controlling the heating and punching processes to prevent punch buckling and maintain precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If stamping is used to pierce a hole with a large L/D ratio, then productivity is high and work quality is good, but the punch buckles
Solution Approach 1:
The invention changes the temperature parameter of the workpiece locally to below the melting point, causing the material to soften and reduce deformation resistance. This allows the punch to pierce holes with large L/D ratios without buckling, while maintaining high productivity and work quality through stamping
Solution Approach 2:
The invention applies local heating to only the portion of the workpiece where the hole needs to be pierced, rather than heating the entire workpiece. This localized softening reduces deformation resistance at the piercing location while maintaining structural integrity elsewhere, preventing punch buckling
2Productivity
If laser cutting is used to pierce a hole, then productivity is maintained, but dimensional precision and surface quality become inferior
Solution Approach 1:
The invention merges laser heating with traditional stamping in a hybrid process. The laser locally heats and softens the workpiece material to below its melting point, and then a punch stamps through the softened area. This combination maintains the high productivity of laser processing while achieving the superior dimensional precision and surface quality of stamping
3Productivity
If laser cutting is used to pierce a hole, then productivity is maintained, but the processing time becomes longer compared to stamping
Solution Approach 1:
The invention applies preliminary laser heating to soften the workpiece material before the punch stamping operation. By pre-heating the material to below its melting point, the subsequent stamping requires less force and time, maintaining high productivity while enabling holes with large L/D ratios that would otherwise cause punch buckling
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
Enables efficient and precise piercing of holes with large L/D ratios by reducing punch buckling, maintaining high productivity and work quality, and eliminating the need for a die, thus optimizing energy use and hole precision.
Implementation Method 1
a local heating means for locally heating part of a workpiece in a temperature range less than a melting point of the workpiece
Implementation Method 2
it is possible to cause the workpiece to locally soften and therefore locally cause the formation of a part with a small deformation resistance
Data Source
AI summary
The present invention relates to a piercing apparatus and a piercing method which drive a punch. The piercing apparatus includes a local heating device for heating part of the workpiece in a temperature range less than a melting point of the workpiece and a punch driving device for driving the punch toward the part of the workpiece which was heated by the local heating device. The piercing method includes a local heating step for heating part of the workpiece in a temperature range less than a melting point of the workpiece and a stamping step for driving the punch toward the part of the workpiece which was heated in the local heating step.