Circular forgings

Our Circular forgings are the result of leading technology derived from decades of experience in the manufacture of wheels and tires for railways, which we began in 1919. We continue to build on its development work in this field. Today our Circular forgings cover a wide range of uses: for gears, crane wheels, flanges, and manhole parts, for example. These products are made efficiently and to high precision with leading-edge technologies, including unique, large-scale equipment. The superior precision and high performance of its products has earned us a reputation for high product quality in this market.

Characteristics

Integrated production system

Our integrated production system, from iron and steel making through forging, rolling and heat treatment, to machining, together with the quality control implemented at each step in the process, leads to products of the highest quality and dimensional accuracy.

Two production lines according to product shape available

We are equipped with two hot working lines for the manufacture of circular forgings: a die-forging line (9,000 ton line) and a ring-rolling line (4,000 ton line). Taking advantage of the special features of each line, we are able to produce forgings with minimum allowance for machining.

Optimal heat treatment to meet application needs

Optimal heat treatments are used along with state-of-the-art equipment for normalizing, quenching, and tempering to meet application needs.

Leading-edge machinery

We are equipped with leading-edge machinery for such processes as turning, boring, and three-dimensional working. The best-possible systems can be selected according to machining requirements for the intended product.

Explore

Flanges for transmission tower

Manhole rims and covers

Roller

Crane wheels

Large rings

Crane wheels

Shape and dimension of forged crane wheel for normal rails

Model number D D1 d1 d2 W A l t Remarks
RW RW900 900 820 300 137 125 80 315 64  
RW800 800 730 300 137 125 80 315 56  
RW710 710 640 260 122 125 80 315 50  
RW630 630 570 260 122 125 80 315 40  
RW560 560 500 210 109 125 80 315 40  
RW5B0 500 440 230 109 125 80 315 40  
RW500 500 440 180 109 125 80 315 40  
RW450 450 390 230 109 125 80 315 60  
RW400 400 245 157 135 80 315 *:
RW355 355 180 87 125 80 280 *:
RW315 315 180 77 125 80 280 *:
RN RN900 900 820 300 137 125 80 200 64  
RN800 800 730 300 137 125 80 200 56  
RN710 710 640 260 122 125 80 200 50  
RN630 630 570 260 122 125 80 200 40  
RN560 560 500 210 109 125 80 200 40  
RN500 500 440 180 109 125 80 200 40  
RN400 400 245 157 135 80 200 125  
RN355 355 122 125 80 125 *
RN315 315 109 125 80 125 *
R R 800 800 730 360 207 135 90 300 56  
R 710 710 640 340 197 135 90 300 50  
R 630 630 570 320 197 135 90 280 40  
R 560 560 490 300 177 135 90 280 86  
R 500 500 440 300 177 135 90 280 94  

*1. Applied rails are the 30kg,37kg,50kg normal rails.

*2. Refer to item III for the finish level and the dimension tolerance of each part.

Shape and dimension of forged crane wheel for 73kg crane rail

Model number D D1 d1 d2 W A l t Remarks
CW CW1000 1000 920 360 197 180 125 450 90  
CW900 900 820 360 197 180 125 450 84  
CW800 800 730 330 177 180 125 450 70  
CW710 710 640 330 177 180 125 450 70  
CW630 630 570 280 157 180 125 450 60  
CW560 560 510 280 152 180 125 400 150  
CN CN1000 1000 920 360 197 180 125 200 90  
CN900 900 820 360 197 180 125 200 84  
CN800 800 730 330 177 180 125 200 70  
CN710 710 640 330 177 180 125 200 70  
CN630 630 570 280 157 180 125 200 60  
CN560 560 500 280 152 180 125 200 50  
CN500 500 400 260 157 180 125 200 100  
C C 630 630 580 370 247 180 135 400 150  
C 560 560 510 370 227 180 135 400 170  

*1. Applied rail is the 73kg crane rail

*2. Refer to item III for the finish level and the dimension tolerance of each part.

The finish degree and dimensions clearance of each forged crane wheel part.

Item Tolerance (Unit: mm)
Tread surface diameter (D) JISB8806 equivalent
Rim inside diameter (D1) 0
−25
Rim variation thickness 12 or less
Web thickness (t) +10 (Tagret)
0
Hub outside diameter (d1) +25
0
Hub thickness variation 12 or less
Hub inside diameter (d2) (Including 3mm machining allowance in diameter)

Contact Information

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