1.Cemented Carbide Pillar Nail Roller
1.1. The roller body consists of three parts: the roll shaft, the roll sleeve and the cemented carbide stud. The roll shaft and the roll sleeve are forgings, and the sticks are tungsten and cobalt cemented carbide powder metallurgy.
1.2. The material and process of roll forgings are carried out according to strict standards. We provide material and performance test reports of roll shafts, roll sleeves and cemented carbide studs.
1.3. We can provide rollers, roll sleeves and carbide sticks for Polysius, KHD, SINOMA, CITIC-HIC high-pressure roller mills.
2.Surfacing Wear-Resistant Layer Roller
2.1Basic parameters of surfacing extrusion roll for roller mill Table 1
| Roller Press Model |
Roller Diameter /mm |
Roller width/mm |
Welding Bandwidth/mm |
Equivalence in Circumference
/mm |
| RP120-80 |
1200 |
800 |
25 |
46 |
| RP140-80 |
1400 |
800 |
25 |
54 |
| RP140-110 |
1400 |
1100 |
25 |
54 |
| RP170-110 |
1700 |
1100 |
25 |
66 |
| RP170-120 |
1700 |
1200 |
30 |
66 |
| RP170-140 |
1700 |
1400 |
30 |
66 |
| RP180-160 |
1800 |
1600 |
30 |
72 |
| RP200-180 |
2000 |
1800 |
30 |
82 |
2.2.The manufacture and inspection of rollers should conform to the mechanical industry standard JB/T 8917-1999. The roll surface material must have high hardness and high alloy content. The following conditions should be met:
2.3.The thickness of wear-resistant layer of roll sleeve is 15-20 mm, the hardness is not less than 55HRC, and cracks of any kind are not allowed on the surface (except cold isolation in manufacturing process).
2.4.The hardness of core of 2.2 roll sleeve is HB180-250, the tensile strength is more than 700 Mpa, and the impact strength is more than 20 J/cm2.
2.5.The wear resistant layer of 2.3 roll sleeve should satisfy the first service life of more than 8000 hours and the total life of the layer is longer than that of the third surfacing welding (24000 hours).
3.The surfacing layer structure includes: bottom layer, transition layer, hard layer, pattern layer and ring band. The surfacing layer adopts the welding materials and methods in Table 2 below.
Table 2
| Welding layer |
Welding Material |
Welding Method |
Remarks |
| Bottom |
ZD1-Ф4+HJ431 |
Submerged arc welding
|
Auto welding
|
| Transition Layer |
ZD2-Ф4+HJ431 |
Submerged arc welding |
Auto welding |
| Hard Layer |
ZD3-Ф4+HJ107 |
Submerged arc welding |
Auto welding |
| Patterned Layer |
ZD310 Ф1.6 |
CO2gas shielded welding
|
Autowelding+Manualwelding |
4. The final annealing treatment of extrusion roll determines whether intermediate annealing heat treatment is needed according to the thickness of surfacing layer. When the surfacing layer is large, the process of intermediate annealing heat treatment is added after process evaluation.
5. Our roll mill extrusion roll manufacturing cycle is about 80 days.
