Wallboard Punch Assembly with Piercing Stripper Bushings
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Solution Overview
Problem
Conventional wallboard punching machines leave unclean holes due to paper fragments from the facing sheets, requiring manual trimming and affecting the aesthetic and acoustical properties of the wallboard.
Innovation Solution
A punch assembly with stripper bushings featuring piercing edges that pre-cut the face paper layer before the punches move through, ensuring clean and fragment-free holes are formed in the wallboard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional punches with flat bottom surfaces are used to punch holes in wallboard, then the punching operation is simple and quick, but paper fragments from the facing sheets extend into the hole openings creating unclean holes
Solution Approach 1:
The piercing edge on the stripper bushing performs a preliminary cutting action on the face paper layer before the main punch creates the hole. This pre-cutting prevents paper fragments from being pushed into the hole opening, thereby achieving clean hole openings without requiring complex post-processing or specialized punch designs.
Solution Approach 2:
The stripper bushing with its piercing edge acts as an intermediary element between the punch and the wallboard. It prepares the face paper layer by making preliminary cuts, allowing the main punch to create clean holes without directly causing paper fragment intrusion. This intermediary component resolves the contradiction by adding a simple preparatory function.
2Force
If punches with teeth are used to pierce the facing paper before punching, then the punching force is improved, but paper fragments still extend into the hole openings
Solution Approach 1:
The piercing edge performs preliminary cutting of the face paper layer in a controlled manner before the main punching action. Unlike teeth that tear and create fragments, the piercing edge makes clean preliminary cuts that prevent fragment formation during the subsequent punching operation, thereby maintaining both adequate punching force and clean hole openings.
3Manufacturing precision
If manual trimming is performed to remove paper fragments from hole openings, then clean holes are achieved, but additional time and labor are required
Solution Approach 1:
The stripper bushing with the piercing edge enables the punching system to perform the cleaning function automatically during the punching operation itself. The preliminary cutting action self-prepares the face paper layer to prevent fragment intrusion, eliminating the need for separate manual trimming operations and thereby maintaining high productivity while achieving clean hole openings.
4Ease of manufacture
If the bottom surfaces of punches are made flat to form 90° corners, then the punching operation is simple, but paper fragments extend into the holes requiring manual trimming
Solution Approach 1:
The piercing edge on the stripper bushing performs preliminary cutting of the face paper layer before the flat-bottomed punch creates the hole. This preliminary action prevents paper fragments from being pushed into the hole opening by the simple flat-bottomed punch, thereby achieving clean holes without requiring complex punch designs or manual trimming.
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 results in clean holes with enhanced aesthetic appearance and improved acoustical properties by minimizing paper fragments and cracking at the hole openings, eliminating the need for manual trimming.
Implementation Method 1
the piercing edge on each of the stripper bushings is moved against the wallboard sheet prior to the punches moving through the stripper bushings and the wallboard sheet to pre-cut openings in the upper face paper layer
Data Source
AI summary
A punch assembly for creating clean holes in a wallboard sheet having at least one surface with a face paper layer. The punch assembly includes a frame having a lower assembly configured to support the wallboard sheet, a plate on an upper frame assembly being reciprocable relative to the at least one surface of the wallboard sheet, at least one stripper bushing connected to the plate, where the at least one stripper bushing including a hole and a piercing edge, and at least one punch configured to move through the hole in the at least one stripper bushing. In operation, the plate is moved against the at least one surface of the wallboard sheet so that the piercing edge of the at least one stripper bushing contacts the face paper layer and at least partially cuts the face paper layer prior to the at least one punch moving through the wallboard sheet to form at least one clean hole in the wallboard sheet.