Long Cutting Knife Structure for Elastic Load Absorption
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Solution Overview
Problem
Conventional long cutting knives experience plastic deformation under heavy loads during the cutting process, particularly when encountering curved or bent wood surfaces, leading to reduced cutting efficiency and increased costs due to the need for high-strength steel materials.
Innovation Solution
A long cutting knife design featuring a blade metal with a cutting edge formed at the intersection of a rake face and a flank face, joined to a base metal made of quenched steel with a yield point greater than or equal to 305 N/mm2, which absorbs heavy loads through elastic deformation, preventing plastic deformation of the cutting edge and allowing for cost-effective production using inexpensive materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cutting edge is made of high-strength alloy tool steel or high-speed tool steel to prevent plastic deformation, then the resistance to plastic deformation is improved, but the manufacturing cost increases significantly
Solution Approach 1:
The cutting knife is divided into two distinct parts: a blade metal portion containing the cutting edge and a base metal portion providing structural support. This segmentation allows each part to be optimized independently - the blade metal can use expensive high-strength material only where needed for cutting, while the base metal uses inexpensive material for support, thereby reducing overall manufacturing cost while maintaining resistance to plastic deformation at the cutting edge.
Solution Approach 2:
Different material properties are assigned to different regions of the cutting knife. The blade metal portion has high strength and wear resistance properties specifically at the cutting edge where they are most needed, while the base metal portion has ordinary structural properties sufficient for support functions. This local differentiation of material quality prevents unnecessary use of expensive materials throughout the entire knife structure.
2Productivity
If the cutting edge cuts curved or bent portions of wood at high feed rate during rounding process, then the productivity is improved, but the cutting edge undergoes plastic deformation
Solution Approach 1:
The cutting knife structure is segmented into a blade metal portion and a base metal portion, allowing the blade metal to be specifically optimized for cutting performance at high feed rates while the base metal provides overall structural support. This enables the cutting edge to maintain strength and resist plastic deformation during high-speed cutting of curved wood portions.
Solution Approach 2:
The cutting knife is designed with a nose bar that contacts the wood surface before the cutting edge during the rounding process. This preliminary action by the nose bar prepares the wood surface and reduces unexpected loads on the cutting edge when encountering curved or bent portions, thereby preventing plastic deformation while maintaining high productivity.
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 design effectively prevents plastic deformation of the cutting edge, maintaining cutting efficiency while reducing production costs by utilizing inexpensive quenched steel for the base metal, which can elastically deform under heavy loads, thus extending the knife's lifespan and performance.
Implementation Method 1
the base metal is a quenched steel material, and the yield point of the steel material before quenching is greater than or equal to 305 N/mm2. Based on this structure, the steel material constituting the base metal has a wide stress range for elastic deformation. Consequently, the base metal may elastically deform when a heavy load is applied to the cutting edge during cutting.
Data Source
AI summary
A long cutting knife is used to cut wood along an outer surface of the wood to obtain a veneer. The long cutting knife includes a blade metal including a cutting edge at a tip end and a flank face adjacent a rear face. The long cutting knife further includes a base metal to which the rear face of the blade metal is joined. The base metal is a steel material or a quenched steel material. For the steel material of the base metal, the yield point before quenching is greater than or equal to 305 N/mm2, the yield point after quenching is greater than or equal to 390 N/mm2, and/or the carbon content is greater than or equal to 0.32%.