Technical specifications of ACHM200
Note from technologistsNew anti-friction materials alloy AFMJ got new name ACHM200 after formalization for antifriction materials (ТУ У 24.1-40340699-001:2020).
Comparative evaluation of service life of parts, which are made from new alloys ACHM200 after replacing of conventional materials:
Increase of service life of parts from new alloys, depending on the type of anti-friction materials, is:
- tin bronzes – from 3 to 5 times;
- tinless bronzes – from 5 to 8 times;
- gray antifriction cast iron – from 10 to 15 times;
- nickel cast iron of the “ni-rezist” type – from 3 to 5 times.
Uttermost parameters for operation of parts from new alloys:
- maximum specific pressure – 250 MPa;
- maximum sliding speed – 20 m/sec;
- maximum sliding speed (with addition of pre-cooled lubricant under pressure) – up to 110-150 m/sec.
Surface of counterbody, which can be applied to direct contact with new alloys:
- chrome plated;
- hardened and not hardened.
Efficiency of new alloys applying is more higher, if surface of counterbody is more harder. State of counterbody surface, which can be applied with new alloys:
- after finishing whetting.
Mechanical and other properties of new alloys after casting (without нeat treating):
- tensile strength – 180-420 MPa;
- flexural strength – 360-840 MPa;
- Brinell scale of hardness – 80-200 HBW;
- density – up to 7.4 g/cm3;
- fluidity spiral – 600-1500 mm;
- linear shrinkage – 1,2-1,8%;
- relative magnetic permeability – 1,003-1,05;
- electrical resistivity – 1,2-2,2 Ohm*mm2/m;
- coefficient of friction (COF) without lubrication – 0,12-0,80;
- coefficient of friction (COF) with lubrication – 0,001-0,10.
If compared to the highest quality alloy used in mechanical engineering – phosphor bronze – new material had overperformed it by these parameters in 1.5 times, and by wear resistance – more than 3 times. Friction coefficient is about 0.01 – in case of high cleanliness of processing counterbody and hardness of 50 – 60 HRC. The coefficient will be slightly higher (about 0.1) in case of counterbody hardness of 20 – 30 HRC. Friction coefficient could be defined more precisely by cleanliness of processing counterbody, conditions of lubrication and difference in hardness of counterbody materials. In any case friction coefficient does not go beyond parameters of standard anti-friction materials.
In case of usage of parts from ACHM200 material in sliding/friction units, in comparison with “native” parts from bronze / brass materials – the advantages are as follows:
- life time of parts from new alloy increases due to high performance (this could be achieved by selection of antifriction materials with the necessary performance properties for this unit);
- helps to reduce downtime of technological equipment, because a new alloyed sliding unit does not suffer from lubricant leak and could work at temperatures up to 400 degrees Celsius. ACHM200 material don’t have tendency to “reeling” of antifriction materials on the counterbody (shaft, axle, etc.) due to friction-caused heating. In case of lack of lubrication in sliding friction unit – local temperature will increase. In those cases, if standard anti-friction materials (bronzes, brasses) are used, heating leads to destruction and untimely failure of anti-friction parts (bushings, liners, guide strips), or whole unit jams (in high-speed gearboxes). This leads to unscheduled emergency shutdown of equipment. In case of ACHM200 material usage units became accident-free;
- usage of that specific material will significantly reduce maintenance expenses of technological equipment due to higher lifetime of ACHM200 parts, which outlive their bronze counterparts;
- such improvement could reduce expenses for spare parts for equipment due to cost differences between ACHM200 parts and brass/bronze parts.