Cold Dry Wood Press Forming for Sharp Edges and Low Porosity
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Solution Overview
Problem
Existing wood forming methods face limitations in achieving clean, sharp edges and efficient compression parallel to the wood grain without requiring high pressures or prior machining, and often result in objects that are not ecological or economical.
Innovation Solution
A method involving cold, dry pressing with pressures greater than 1.5*10⁶ N/m², parallel to the wood grain, using a die with angled flanges to guide the forming press, allowing for precise deformation without prior machining, resulting in objects with clean, sharp edges and enhanced resistance to shocks and moisture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If compression is applied parallel to the wood grain, then the resulting object has sharp edges and clean faces defined by compressed fibers, but extremely high pressures are required that are impossible to achieve with ordinary presses
Solution Approach 1:
The patent changes the compression direction from parallel to perpendicular relative to the wood grain, applying pressure in a different dimensional orientation. This allows achieving clean edges and sharp faces through perpendicular compression that densifies the wood without requiring the extremely high pressures needed for parallel grain compression.
Solution Approach 2:
The patent applies preliminary machining (milling) to create the cavity and define the aesthetic appearance of edges before compression. This preliminary action prepares the wood blank so that subsequent perpendicular compression can densify the material and close pores without needing to compress parallel to the grain, thus avoiding the need for extremely high pressures.
2Manufacturing precision
If prior machining of a cavity is performed, then the aesthetic appearance of edges is determined by milling, but the process requires additional machining steps and time
Solution Approach 1:
The patent performs preliminary machining to create the cavity and define edge aesthetics before compression. This preliminary action establishes the final edge quality through milling, while the subsequent perpendicular compression step densifies the wood and closes pores without requiring additional machining operations, thereby maintaining high production speed.
Solution Approach 2:
The patent combines the cavity formation and edge definition functions into a single preliminary machining step, followed by a compression step that simultaneously densifies the wood and closes pores. This merging of functions eliminates the need for separate post-compression machining operations, improving productivity while maintaining edge quality.
3Strength
If high compression pressure is applied parallel to the grain, then the wood fibers are compressed upon themselves, but the process is impossible for large objects with ordinary presses
Solution Approach 1:
The patent changes the compression direction from parallel to perpendicular relative to the wood grain. This dimensional change allows achieving fiber densification and strength enhancement without requiring the extremely high forces needed for parallel grain compression, making the process feasible for large objects with ordinary presses.
Solution Approach 2:
The patent changes the compression parameter from parallel to perpendicular orientation relative to the wood grain. This parameter change allows achieving effective fiber compression and strength enhancement at lower, more achievable pressure levels that are suitable for large objects and ordinary presses.
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 method enables the rapid production of high-quality wooden objects with smooth, resistant surfaces and reduced porosity, suitable for containing viscous or liquid products, while being economical and ecological.
Implementation Method 1
pressing the blank using a forming press placed against a free face of the blank, applying pressure in a direction parallel to the wood grain wherein the pressure during pressing is greater than 1.5×10^6 N/m^2
Implementation Method 2
the die has a positioning side in support against the blank during pressing and forming a first angle not exceeding 5° with the wood fibers of the blank positioned in the die, and/or in that the form press has a punching side in support against the blank during pressing, the punching side forming a second angle not exceeding 5° with the wood fibers
Data Source
Figure 1~2
Figure 3a~3b
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AI summary
The present invention relates to a method for shaping a wooden object, comprising the following steps: - obtaining a blank by cutting a piece of wood in a direction transverse to the fibres of the wood; - positioning the blank using a mould; - pressing the blank by means of a shaping press brought to bear against a free surface of the blank, by exerting pressure in a direction parallel to the fibres of the wood, characterised in that the pressure during pressing is greater than 1.5*106 N/m2, in that the pressing is carried out under cold conditions, in that the pressing is carried out under dry conditions, and in that the mould comprises a positioning flank that bears against the blank during the pressing and forms a first angle that does not exceed 5° with the fibres of the wood of the blank positioned in the mould, and/or in that the shaping press comprises a punching flank that bears against the blank during the pressing, the second punching flank forming a second angle that does not exceed 5° with the fibres of the wood of the blank positioned in the mould. The present invention also relates to a wooden object obtained by this method.