松紧面结构对装饰薄木柔韧性及异型木饰面性能的影响OA

With the growing popularity of personalized and customized home design,whole-house custom furniture has gradually become a mainstream market trend.This trend has not only driven diversification in furniture design but also significantly boosted the demand for irregularly shaped furniture.Decorative thin wood,valued for its attractive grain patterns,is widely used for surface finishing in engineered wood products.However,the characteristics of decorative thin wood with low strength and easy to crack limit its application in shaped finishes.To optimize the performance of thin wood in shaped finishes,this study took beech,white oak and black walnut as experimental objects,and investigated the influence of the loose and tight surface structure of veneer on its flexibility and cladding performance and established the response relationship between flexibility and surface properties.Finally,the application simulation of the thin wood cladding performance was carried out to statistically analyze the cracking at the folded corners when the thin wood samples were cladded with wood members at different angles(50°,60°,90°,100°,120° and 130°)under different bending methods.The results indicated that all three decorative thin wood species(beech,white oak,and black walnut)exhibited more pronounced surface micro-fissures on the loose side compared to the tight side.Additionally,the surface roughness values Ra(H)were consistently higher on the loose side across all samples.The difference in roughness between the loose and tight surfaces resulted in a bending pattern of the thin wood samples that had a large effect on flexibility.When bending from the loose side to the tight side(Bend B),the loose side served as the straining surface of the bent veneer,and the stresses concentrated at the mid-axis location were dispersed by the cleavage,and the thin wood was able to withstand a greater degree of bending deformation.As a result,the minimum bar diameters for black walnut,white oak,and beech in Bend B mode were 6.0,7.0 and 3.5 mm,respectively,which were 50%,46%and 36%lower than that in tight face bending with a loose face(Bend A).In this mode(Bend B),the cracking of all three thin woods was reduced to varying degrees compared to Bend A,which provided the prerequisite for the reduction of the minimum wrapping angle of the veneers.In Bend B,the minimum cladding angle of beech was reduced by 10° compared to Bend A,reaching 90°,thereby enabling direct finishing of right-angled curved surfaces.The minimum cladding angle of black walnut thin wood samples in Bend B mode was reduced by 20° compared to Bend A mode and reached 100°.White oak thin wood had a minimum wrapping angle of 130° in both bending conditions.Through the difference in surface properties of the loose and tight surfaces and the difference in flexibility under different wrapping modes,it was concluded that the loose surface had better bending performance when used as a should-draw surface,which provides a theoretical basis for improving the performance of decorative veneers in shaped finishes.