UCG200P UCG320P Precision Cylindrical Grinder

Technical parameters of UCG200P UCG320P Universal Cylindrical Grinder

Model		UCG200	UCG320
Type		P	P
Distance between centers  mm		520; 765; 1080  (20”; 30”; 43”)	520; 765; 1080 (20”; 30”; 43”)
Center height　mm		125 (4.9”)	180 (7.1”)
Max. swiveling diameter  mm		Φ240 (9.4”)	Φ350 (14”)
Max. grinding length　mm		500; 750; 1000 (20”; 30”; 39”)	500; 750; 1000 (20”; 30”; 39”)
External grinding range　mm		Φ5~200 (2-7.9”)	Φ5~320 (2-13”)
Internal grinding range  mm		Φ13~80 (0.51-3.1”)	Φ16~125 (0.63-4.9”)
Internal grinding length  mm		125 (4.9”)	160 (6.3”)
Max. weight of workpiece between centers　 kg		50	100
Grinding wheel	Dimensions (OD × W × ID) mm	Φ400×(32~50)×203 (16x(1.3-2)x8”)	Φ400×(32~50)×203 (16x(1.3-2)x8”)
	Max. linear velocity  m/s	35	35
Swiveling angle of table	Clockwise	9°(500); 8°(750); 3° (1000)	9°(500); 8°(750); 3° (1000)
	Counter-clockwise	9°(500); 8°(750); 7° (1000)	9°(500); 8°(750); 7° (1000)
Taper hole of spindle	Work head	MT-4	MT-4
	Tailstock	MT-4	MT-4
Total power  kW		7.5	7.5
Net weight 　 kg		2500; 3000; 3500	2500; 3000; 3500
Gross weight  kg		3100; 3600; 4100	3100; 3600; 4100
Packing dimensions	L　　mm	2750; 2870; 3700	2750; 2870; 3700
	W　 mm	2000	2000
	H　 mm	2100	2150

Working accuracy of UCG200P UCG320P Universal Cylindrical Grinding Machine

NO	Inspection character	Test piece diagram and grinding condition		Inspection item	UCG200P		UCG320P
					500,750	1000	500,750		1000
P1	The grinding accuracy of test piece between centers		L=150 d=50	Circularity mm	0.0005	0.0005	0.0005		0.0005
			L=200  d=60		0.0005	0.0005	0.0005		0.0005
			L=350 d=35	Consistency of diameter in longitudinal section mm	0.003	——	0.003		——
			L=750 d=75		——	0.005	——		0.005
			Roughness μm		Ra≤0.01
P2	The grinding accuracy of short test piece on chuck		L=30  d=60	Circularity mm	0.002
			Roughness μm		Ra≤0.04
P3	The accuracy of test internal grinding on chuck		L=50  d=30	Circularity mm	0.002
			L=100  d=60		0.002
			Roughness μm		Ra≤0.04
P4	The accuracy of external grinding plunge-in test		L=30  d=25	Consistency of diameter in grinding a batch of spare parts mm	Fixed distance grinding 0.01			Fixed distance grinding 0.012
			L=30  d=40		Automatic gauge 0.004			Automatic gauge 0.005

Features 
1. The hydraulic drive system uses screw pump which is of smooth running and low noise.
2. The wheel head adopts sleeve type hydrodynamic bearing main shafting and features high rotary precision and high rigidity.
3. The feeding guideway uses plastic-filming guideway, thus promoting the smoothness and vibration resistance of low-speed operations.
4. With high machining precision, the integral layout is rational, operating handles are centralized arranged.

Standard accessories
1. Grinding wheel dresser;
2. Plane grinding wheel;
3. Balancing arbor;
4. Carbide tipped centers; 
5. Single-head spanner;
6. Coolant tank;
7. Three-jaw chuck;
8. Wedges;
9. Internal grinding attachment;
10. Internal wheel;
 
Optional accessories
1. Close center rest;
2. Open center rest; 
3. Four-jaw chunk;
4. Grinding wheel balancing stand;
5. Diamond pen;
6. Paper filter;

Cylindrical grinder/Cylindrical Grinding Machine is a type of grinding machine used to shape the outside of an object. The cylindrical grinder can work on a variety of shapes, however the object must have a central axis of rotation. This includes but is not limited to such shapes as a cylinder, an ellipse, a cam, or a crankshaft.

A cylindrical grinder
Cylindrical grinder/Cylindrical Grinding Machine is defined as having four essential actions:
The work (object) must be constantly rotating;
The grinding wheel must be constantly rotating;
The grinding wheel is fed towards and away from the work;
Either the work or the grinding wheel is traversed with respect to the other.
While the majority of cylindrical grinders employ all four movements, there are grinders that only employ three of the four actions.

History of cylindrical grinder
The origins of the cylindrical grinder, as with all other modern machine tools, stem from the experimentation and invention of John Wilkinson and later Henry Maudslay who built the first horizontal boring machine and the first engine lathe, respectively. The cylindrical grinder owes much of its development from the onset of the Industrial Revolution, particularly to the advent of reliable, inexpensive steel production and later the improvement of the grinding wheel. The basis for the modern day cylindrical grinder was first built in the 1830s by two men working independently, Jonathan Bridges and James Wheaton . It is unclear as to which man had first produced the machine but both are closely tied to the first historical appearance of the modern day tool. It took another 40 years before further improvement and refinement of the tool occurred.

Types of cylindrical grinder/Cylindrical Grinding Machine
There are five different types of cylindrical grinding: outside diameter (OD) grinding, inside diameter (ID) grinding, plunge grinding, creep feed grinding, and centerless grinding.

Outside diameter grinding
OD grinding is grinding occurring on external surface a of an object between the centers. The centers are end units with a point that allow the object to be rotated. The grinding wheel is also being rotated in the same direction when it comes in contact with the object. This effectively means the two surfaces will be moving opposite directions when contact is made which allows for a smoother operation and less chance of a jam up.

Inside diameter grinding
ID grinding is grinding occurring on the inside of an object. The grinding wheel is always smaller than the width of the object. The object is held in place by a collet, which also rotates the object in place. Just as with OD grinding, the grinding wheel and the object rotated in opposite directions giving reversed direction contact of the two surfaces where the grinding occurs.

Plunge grinding
A form of OD grinding, however the major difference is that the grinding wheel makes continuous contact with a single point of the object instead of traversing the object.

Creep feed grinding
Creep Feed is a form of grinding where a full depth of cut is removed in a single pass of the wheel. Successful operation of this technique can reduce manufacturing time by 50%, but often the grinding machine being used must be designed specifically for this purpose. This form occurs in both cylindrical and surface grinding.

Centerless cylindrical grinder
A schematic of the centerless grinding process.
Centerless grinding is a form of grinding where there is no collet or pair of centers holding the object in place. Instead, there is a regulating wheel positioned on the opposite side of the object to the grinding wheel. A work rest keeps the object at the appropriate height but has no bearing on its rotary speed. The workblade is angled slightly towards the regulating wheel, with the workpiece centerline above the centerlines of the regulating and grinding wheel; this means that high spots do not tend to generate corresponding opposite low spots, and hence the roundness of parts can be improved. Centerless grinding is much easier to combine with automatic loading procedures than centered grinding; throughfeed grinding, where the regulating wheel is held at a slight angle to the part so that there is a force feeding the part through the grinder, is particularly efficient.

Control methods
There are three basics ways in which an operator can interact with a cylindrical grinder. Either manual manipulation of the machine, Numerical Control with a punched card system or using Computer Numerical Control using a pre existing interface designed for that machine or by using a PC as an interface to communicate with the grinder. The first two options are rarely if ever used today. CNC operated cylindrical grinders are the most technologically advanced, efficient, reliable systems in the manufacturing industry.

Applications
The cylindrical grinder is responsible for a plethora of innovations and inventions in the progression of science and technology. Any situation in which extremely precise metalworking is required, the cylindrical grinder is able to provide a high level of precision.[citation needed] From the automotive industry to military applications, the benefits of the cylindrical grinder are numerous.

Standard accessories
1. Grinding wheel dresser;
2. Plane grinding wheel;
3. Balancing arbor;
4. Carbide tipped centers; 
5. Single-head spanner;
6. Coolant tank;
7. Three-jaw chuck;
8. Wedges;
9. Internal grinding attachment;
10. Internal wheel;
 
Optional accessories
1. Close center rest;
2. Open center rest; 
3. Four-jaw chunk;
4. Grinding wheel balancing stand;
5. Diamond pen;
6. Paper filter;

Technical parameters of UCG200P UCG320P Universal Cylindrical Grinder

Model		UCG200	UCG320
Type		P	P
Distance between centers  mm		520; 765; 1080  (20”; 30”; 43”)	520; 765; 1080 (20”; 30”; 43”)
Center height　mm		125 (4.9”)	180 (7.1”)
Max. swiveling diameter  mm		Φ240 (9.4”)	Φ350 (14”)
Max. grinding length　mm		500; 750; 1000 (20”; 30”; 39”)	500; 750; 1000 (20”; 30”; 39”)
External grinding range　mm		Φ5~200 (2-7.9”)	Φ5~320 (2-13”)
Internal grinding range  mm		Φ13~80 (0.51-3.1”)	Φ16~125 (0.63-4.9”)
Internal grinding length  mm		125 (4.9”)	160 (6.3”)
Max. weight of workpiece between centers　 kg		50	100
Grinding wheel	Dimensions (OD × W × ID) mm	Φ400×(32~50)×203 (16x(1.3-2)x8”)	Φ400×(32~50)×203 (16x(1.3-2)x8”)
	Max. linear velocity  m/s	35	35
Swiveling angle of table	Clockwise	9°(500); 8°(750); 3° (1000)	9°(500); 8°(750); 3° (1000)
	Counter-clockwise	9°(500); 8°(750); 7° (1000)	9°(500); 8°(750); 7° (1000)
Taper hole of spindle	Work head	MT-4	MT-4
	Tailstock	MT-4	MT-4
Total power  kW		7.5	7.5
Net weight 　 kg		2500; 3000; 3500	2500; 3000; 3500
Gross weight  kg		3100; 3600; 4100	3100; 3600; 4100
Packing dimensions	L　　mm	2750; 2870; 3700	2750; 2870; 3700
	W　 mm	2000	2000
	H　 mm	2100	2150

Working accuracy of UCG200P UCG320P Universal Cylindrical Grinding Machine

NO	Inspection character	Test piece diagram and grinding condition		Inspection item	UCG200P		UCG320P
					500,750	1000	500,750		1000
P1	The grinding accuracy of test piece between centers		L=150 d=50	Circularity mm	0.0005	0.0005	0.0005		0.0005
			L=200  d=60		0.0005	0.0005	0.0005		0.0005
			L=350 d=35	Consistency of diameter in longitudinal section mm	0.003	——	0.003		——
			L=750 d=75		——	0.005	——		0.005
			Roughness μm		Ra≤0.01
P2	The grinding accuracy of short test piece on chuck		L=30  d=60	Circularity mm	0.002
			Roughness μm		Ra≤0.04
P3	The accuracy of test internal grinding on chuck		L=50  d=30	Circularity mm	0.002
			L=100  d=60		0.002
			Roughness μm		Ra≤0.04
P4	The accuracy of external grinding plunge-in test		L=30  d=25	Consistency of diameter in grinding a batch of spare parts mm	Fixed distance grinding 0.01			Fixed distance grinding 0.012
			L=30  d=40		Automatic gauge 0.004			Automatic gauge 0.005