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UCG200 Universal Cylindrical Grinding Machine
  • UCG200 Universal Cylindrical Grinding Machine

UCG200 Universal Cylindrical Grinding Machine

The wheel head could achieve power feed, and total feed could be set through adjusting the stop dog. Head stock spindle is equipped with inverter motor; therefore the operator could adjust speed through the inverter panel quite easily.
  • UCG200 Universal Cylindrical Grinding MachineDownload
  1. The well designed structure of UCG200 Universal Cylindrical Grinding Machine ensures excellent processing capability.
  2. The working table longitudinal travel is driven by hydraulic cylinder.
  3. The base of the slide way is equipped with TF, and has been precisely manual scraped
  4. Super strong wheel head spindle is support by bimetal shell bearing, and this structure makes the spindle have high rigidity and stability, as well as excellent finishing surface.
  5. The wheel head could achieve power feed, and total feed could be set through adjusting the stop dog.
  6. Head stock spindle is equipped with inverter motor; therefore the operator could adjust speed through the inverter panel quite easily.
  7. Treadle which can spread or draw back the tail stock quill allows the operator to load workpiece by hand easily.
Standard accessories
1. Internal grinding spindle;        2. Flange;
3. Three-jaw chuck;              4. Balance arbor;
5. Dog pole and arm;             6. Alloy center;
7. Table swiveling wrench;        8. Coolant tank;
9. Wheel;                      10. Wheel extractor;
11. Working lamp;              12. Extension arbor;
13. Internal wheel;              14. Wedge;
Optional accessories
1. Steady rest;                 2. Radial dresser;
3. End dresser;                4. Balance stand;
Technical parameters of UCG200 Universal Cylindrical Grinding Machine
Main parameters Unit UCG200
Distance between centers mm 500; 750 (20-30”)
Center height mm 135 (5”)
Dia. Ground(O.D) mm Φ5~200 (0.2-7.9”)
Dia. Ground(I.D) mm Φ25~100 (1-3.9”)
Max length ground(O.D) mm 500; 750 (20-30”)
Max length ground(I.D) mm 125 (4.9”)
Max weight of workpiece kg 100
Workhead swiveling angle ° +90°
Workhead center taper   MT-4
Workhead spindle speed r/min 50HZ: 25~380 stepless
Wheel spindle speed r/min 1670
Wheelhead rapid travel mm 50 (2”)
Wheelhead max travel mm 205 (8”)
Wheelhead swiveling angle ° +10°
Wheelhead hand feed per. rev mm Rough:2; Fine: 0.5
Wheelhead hand feed per. gra mm Rough:0.01; Fine: 0.0025
Wheel size( OD x W x ID) mm Φ400x50x203 (16x2x8”)
Peripheral velocity m/s 35
Internal grinding device spindle speed r/min 10000/15000
Dimension of internal grinding wheel mm Max:50x25x13 (2x1x0.51”);
 Min:17x20x6 (0.67x0.79x0.24”)
Table hand feed per. rev mm 6
Max swiveling angle of table: Clockwise °
Max swiveling angle of table: Anticlockwise ° 9°(500); 8°(750)
Longitudinal speed range of table m/min 0.1~4
Tailstock center tape   MT-4
Tailstock quill travel mm 30 (1.2”)
Wheelhead motor power kW 4
Internal grinding device motor power kW 1.1
Workhead motor power kW 1.1
Gross weight kg 4100(500); 4300(750)
Packing size(L x W x H) mm 2350x2030x2050(500); 2750x2030x2050(750)

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.

The Brown & Sharpe company in Providence, RI was one of the first builders of the Willcox & Gibbs Sewing Machine, one of the first piece of precision machinery to be used in a residential setting. Brown believed that the shaft and needle bars of the sewing machine must be crafted from hardened tool steel. It was this desire that led to their experimentation with building a cylindrical grinder. The first attempt was simply a small lathe with a grinding wheel mounted to it. Subsequent attempts led to the cylindrical grinder displayed at the 1876 Centennial Exposition and the subsequent patent.

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.

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.
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