Saw Chain Cutting Element With HSS Edge and High-Strength Support
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional saw chain cutting members have limited attrition resistance and tensile strength, requiring frequent sharpening and being unsuitable for high-temperature austenitizing processes that damage support alloys, while attempts to improve attrition resistance with hard chromium plating are ecologically disadvantageous.
Innovation Solution
Cutting members made from a material compound strip with a high-speed steel cutting part and a tool steel support part, optimized through quenching and tempering at temperatures above austenitizing temperatures but below complete hardening temperatures, achieving hardness over 600 HV and tensile strength over 2000 MPa, and optionally using high-speed steel for the depth limiter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional low-alloyed heat treatable steel is used for cutting members, then manufacturing cost is reduced, but attrition resistance and service life are minimal
Solution Approach 1:
The cutting member uses a composite structure combining low-alloyed heat treatable steel support part with high-speed steel cutting part. The support part provides structural integrity and cost-effectiveness, while the high-speed steel cutting part provides superior attrition resistance and service life. This composite approach resolves the contradiction by integrating materials with complementary properties.
2Reliability
If high-speed steel is used for the cutting part with austenitizing temperatures above 1000°C, then attrition resistance is improved, but the support alloy is damaged due to grain coarsening
Solution Approach 1:
The cutting member is divided into two distinct parts: a support part made of low-alloyed heat treatable steel and a cutting part made of high-speed steel. This segmentation allows each part to be optimized for its specific function - the support part for structural integrity and the cutting part for attrition resistance - while avoiding the problem of high temperatures damaging the support alloy.
Solution Approach 2:
Different regions of the cutting member have different material properties tailored to their specific requirements. The cutting part uses high-speed steel with superior attrition resistance for the cutting edges, while the support part uses cost-effective low-alloyed steel for structural support. This local differentiation resolves the contradiction by applying high-performance material only where needed.
3Reliability
If conventional material compound strips with high-speed steel cutting part are used, then attrition resistance is improved, but tensile strength of the support part is insufficient at 1700 MPa
Solution Approach 1:
The patent optimizes the composition parameters of the low-alloyed heat treatable steel support part, specifically adjusting carbon content (0.3-0.5%), alloying elements (Cr, Mn, Mo, B), and heat treatment parameters (austenitizing temperature 850-950°C, tempering temperature 150-500°C) to achieve tensile strength of 2000-2500 MPa. This parameter optimization resolves the contradiction by enhancing support part strength while maintaining compatibility with high-speed steel cutting part.
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 significantly increases the service life of saw chains by enhancing attrition resistance and tensile strength, reducing cutting forces, and improving cutting performance, making them suitable for harsh applications like tree felling and demolition work.
Implementation Method 1
optimized through quenching and tempering at temperatures above austenitizing temperatures but below complete hardening temperatures, achieving hardness over 600 HV and tensile strength over 2000 MPa
Data Source
AI summary
A cutting member for a saw chain and a method for the production thereof, the cutting member comprising a support part made of a steel alloy and a cutting part welded to the support part along a welding connection made of a high speed steel. The steel alloy of the support part is a tool steel that has the following composition (specifications in % by weight):Carbon (C)0.4 to 1.0Silicon (Si)up to 1.8Manganese (Mn)up to 0.6Chromium (Cr)4.5 to 12Molybdenum (Mo)up to 3Vanadium (V)up to 2Iron (Fe) and accompany elements caused by melting and impurities as the remainder. The steel alloy of the support part in a quenched and tempered state has a hardness of more than 600 HV and a tensile strength of more than 2000 MPa as a result of curing at a suitable temperature above the austenitizing temperature of the high speed steel.