Punch Holder Thread Stop for Safe Tool Length Adjustment
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Solution Overview
Problem
Existing punching apparatuses face challenges in accurately adjusting the length of the punch assembly after sharpening, leading to potential damage from incorrect adjustments, especially when the cutting tool's length is excessively reduced, causing collisions and thread stress, which can result in damage to the cutting tool, punch holder, and punching machine.
Innovation Solution
The punching apparatus incorporates a stopping element with anti-rotation means and a threaded coupling with a defined minimum length to prevent excessive reduction in the engagement portion, ensuring the cutting tool is properly aligned and secured, and an anti-rotation mechanism to prevent incorrect adjustments, allowing safe operation even by inexperienced operators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cutting tool is sharpened to maintain cutting capacity, then the cutting edge quality is improved, but the overall length of the tool is reduced, requiring precise adjustment of the punch assembly length
Solution Approach 1:
The patent incorporates a stopping element with a stopping face positioned at a predetermined location within the guiding body. This stopping element preliminarily defines the maximum axial displacement of the beating element relative to the guiding body, ensuring that even after tool sharpening and reassembly, the cutting end will not collide with the extractor element. The stopping element is provided in advance to prevent excessive reduction in engagement portion length and potential damage before it occurs.
2Adaptability or versatility
If the engagement portion length is reduced to accommodate shorter tools, then adaptability is improved, but the thread strength and connection reliability are worsened
Solution Approach 1:
The stopping element preliminarily establishes the minimum engagement portion length by limiting the axial displacement of the beating element. This ensures that the threaded coupling between the beating element and the punching tool maintains sufficient thread engagement strength, preventing thread damage while still allowing for tool length adjustments after sharpening operations.
3Ease of operation
If manual adjustment of the punch assembly length is allowed, then ease of operation is improved, but the risk of incorrect adjustment and potential damage is increased
Solution Approach 1:
The stopping element provides preliminary anti-action by physically preventing the beating element from displacing axially beyond a safe limit. This counteracts the potential for incorrect adjustment by inexperienced operators, as the stopping element's stopping face blocks excessive movement before it can cause damage to the cutting tool, punch holder, or punching machine, while still allowing sufficient adjustment range for proper tool installation after sharpening.
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 solution effectively controls the position of the punching tool with respect to the beating element, preventing damage and ensuring accurate adjustments, thus ensuring safe and reliable operation, even for inexperienced operators, by maintaining an appropriate thread engagement and preventing collisions.
Implementation Method 1
elastic means, so-called 'spring pack ', which are interposed between the guiding body or the base element and the first upper end of the beating element and are arranged to reposition the latter in a raised position (in order to disengage the cutting tool from the machined piece) after driving of the ram
Implementation Method 2
the connection between the beating element of the driving assembly and the punching tool (punch or adapter supporting the punch tip) for forming the so-called punch assembly, is always carried out by means of a threaded coupling
Data Source
AI summary
A punching apparatus includes a punch holder and a punching tool. The punch holder includes a guiding body having a mounting cavity to slidably receive the punching tool and a driving assembly connected to the guiding body and provided with a beating element having first and second connecting ends coupled by a threaded coupling that enables a relative rotation for a linear movement of the punching tool with respect to the beating element. A stopping element has a first end fixed inside a connecting cavity in one of the connecting ends and arranged to receive the other connecting end and a second end inserted into a stopping cavity of the other connecting end and sliding inside the stopping cavity.