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D51A and D51B ring rolling machines have been widely used for ring like semifinished of bearing forging auto-gear & flange. - details see: https://www.machineto.com/vertical-type-metal-hot-forging-ring-rolling-machine-10160639

Jack Xue(Mr.)
Anyang Forging Press Machinery Industry Co.,Ltd.
Tel: 0086-372-5986768
Mobile phone:0086-18790840945
Fax: 0086-372-5931234
Website: http://www.chinesehammers.com

Skype: jackxue998

The main technical parameter :

NO.	Specification	Unit	D51-160	D51-250A	D51-250B	D51-350A	D51-350B
1	Max out-Dia	mm	55-160	80-250	80-250	180-350	180-350
2	Max height	mm	40	60	130	120	160
3	Max rolled force	KN	50	100	150	250	300
4	Speed of rolling	M/s	2.5	2.3	1.8	1.5	1.5
5	Slide distance	mm	60	100	100	110	110
6	Power of main motor	Kw	18.5	37	45	75	90
7	Overall size	L×W×L (mm)	1700×1525×1700	2300×1625×2310	2750×1625×2310	3200×2000×2900	4200×2000×2910
8	Weight	T	≈2.7	≈7	≈7.5	≈11	≈12

NO.	Specification	Unit	D51-450A	D51-450B	D51-550A	D51-550B	D51-800A	D51-800B
1	Max out-Dia	mm	250-450	250-450	350-600	350-600	400-800	400-800
2	Max height	mm	120	220	180	300	80	200
3	Max rolled force	KN	350	450	550	550	550	550
4	Speed of rolling	M/s	2	1.6	1.7	1.3	1.37	1.37
5	Slide distance	mm	130	130	150	150	200	200
6	Power of main motor	Kw	75	110	110	132	110	110
7	Overall size	L×W×L (mm)	3670×2700×3210	4500×2700×3210	5000×4000×3500	5800×4000 ×3500	5500×3500 ×4500	5700×3500 ×4500
8	Weight	T	≈13.5	≈17.5	≈22	≈23	≈24	≈25