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D51A and D51B ring rolling machines have been widely used for ring like semifinished of bearing forging auto-gear & flange. D52 - details see: https://www.machineto.com/ring-rolling-machine-10165423

NO.	Specification	Unit	D51-160B	D51-250C	D51-250C-B	D51-350B
1	Max out-Dia	mm	55-160	80-250	80-250	180-350
2	Max height	mm	40	60	130	120
3	Max rolled force	KN	50	100	150	250
4	Speed of rolling	M/s	2.5	2.3	1.8	1.5
5	Slide distance	mm	60	100	100	110
6	Power of main motor	Kw	18.5	37	45	90
7	Overall size	L×W×Lmm	1700×1525×1700	2300×1625×2310	2750×1625×2310	4200×2000×2910
8	Weight	T	≈2.7	≈7	≈7.5	≈12
NO.	Specification	Unit	D51-450B	D51-450KY-B	D51-550B	D51-800B
1	Max out-Dia	mm	250-450	250-500	350-600	400-800
2	Max height	mm	120	230	300	200
3	Max rolled force	KN	350	500	550	550
4	Speed of rolling	M/s	2	1.5	1.3	1.37
5	Slide distance	mm	130	130	150	200
6	Power of main motor	Kw	110	110	132	110
7	Overall size	L×W×Lmm	2300×1625×2310	5500×3600×3200	5800×4000×3500	5700×3500×4500
8	Weight	T	≈17.5	≈21	≈23	≈25

D52 series			630	1250	1600	2000	3000
Dimension Of Ring	Out-dia	mm	220-630	400-1250	400-1600	450-2000	500-3000
	Height	mm	160	250	300	350	400
Parameter Of Machine	Radial Rolling Force	KN	500	800	1000	1250	2000
	Linear Velocity Of Rolling	M/s	1.3	1.3	1.3	1.3	1.3
	Driving Power	Kw	110	200	280	355	500
Overall Dimensions	Lenghth	mm	5230	7700	9000	10000	12700
	Width	mm	1900	2400	2500	3500	4100
	Height	mm	2530	3600	3600	4000	4300