Cutting element for a saw chain and method for the production thereof
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 1.0 Silicon (Si) up to 1.8 Manganese (Mn) up to 0.6 Chromium (Cr) 4.5 to 12 Molybdenum (Mo) up to 3 Vanadium (V) up to 2 Iron (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.
1 . A cutting member for a saw chain, the cutting member consisting of a compound material consisting of a support part, a cutting part, and a welded seam connecting the support part and the cutting part,
wherein the cutting part is made of a high speed steel,
wherein the support part is made from a tool steel that has the following composition in % by weight:
Carbon (C)
0.4 to
1.0
Silicon (Si)
up to
1.8
Manganese (Mn)
up to
0.6
Chromium (Cr)
4.5 to
12
Molybdenum (Mo)
0.5 to
3
Vanadium (V)
up to
2
Iron (Fe) and impurities as the remainder,
wherein the tool steel of the support part is in a quenched and tempered state, has a hardness between 630 and 750 HV and a tensile strength between 2100 and 2500 MPa, obtained by hardening the compound material at a temperature above austenitizing temperature of the high speed steel, quenching and tempering, wherein the temperature above the austenitizing temperature range is within a range from 1050 to below 1200° C.
2 . The cutting member according to claim 1 , wherein the tool steel of the support part has the following composition in % by weight:
Carbon (C)
0.45 to
0.8
Silicon (Si)
up to
1.3
Manganese (Mn)
up to
0.6
Chromium (Cr)
6 to
10
Molybdenum (Mo)
up-0.5 to
1.6
Vanadium (V)
up to
1
Iron (Fe) and impurities as the remainder.
3 . The cutting member according to claim 1 , wherein the high speed steel of the cutting part has the following composition in % by weight:
Carbon (C)
0.5 to
1.1
Silicon (Si)
up to
0.5
Manganese (Mn)
up to
0.5
Chromium (Cr)
3.5 to
4.5
Molybdenum (Mo)
2 to
6
Vanadium (V)
0.5 to
3.0
Tungsten (W)
up to
3
Cobalt (Co)
up to
10
Iron (Fe) and impurities as the remainder.
4 . The cutting member according to claim 1 , wherein the welded seam connecting the tool steel of the support part and the high speed steel of the cutting part is obtained by laser or electron beam welding, wherein the welded seam is located in a less loaded region of the cutting member which is subjected to reduced loads during operation.
5 . The cutting member according to claim 4 , wherein a geometrically narrower lower track of the welded seam is arranged on the outside of the cutting member and an upper track of the welded seam is arranged on the inside of the cutting member.
6 . The cutting member according to claim 1 , wherein the cutting member has a depth limiter that at least partially consists of high speed steel.
7 . The cutting member according to claim 1 , wherein the cutting part has a smaller thickness than the support part.
8 . A saw chain for motorised chainsaws, comprising: drive links and a cutting member according to claim 1 .