CG800H Cylindrical Grinding Machine

Working accuracy
1. Roundness: 2.5μm;
2. Dia. uniformity in the long. Section: 12μm;
3. Surface roughness: Ra0.32μm.

CG800H Cylindrical Grinding MachineDownload

INQUIRY

PDF Format

Description

Equipments

Specifications

Working accuracy

Technical Specifications of CG800H Cylindrical Grinding Machine

Model		Unit	CG800
Type			H
Center height		mm	500 (20″)
Work length to be ground		mm	3000,4000,5000 (118″,157″,197″)
Work dia. To be ground		mm	Φ50-800 (2-31″)
Max. work height		kg	3000
Headstock and tailstock center tapered-bore			Metric 80#
Headstock driving-plate rotating-speed (stepless adjustable)		r/min	7-70
Wheel peripheral velocity		m/s	17.5 / 35
Min. intermittent feed (coarse/fine)		mm	0.02 / 0.0025
Machine weight (Net/Gross Weight)	3000	kg	13000 / 17500
	4000	kg	15000 / 19000
	5000	kg	Case 1: 21000 / 26000 Case 2: 5000 / 6500
Package Dimension: (LxWxH)	3000	mm	8850 x 2950 x 2350
	4000	mm	10800 x 2950 x 2350
	5000	mm	Case 1: 13100 x 2750 x 2100 Case 2: 3300 x 2250 x 2200

Working accuracy
1. Roundness: 2.5μm;
2. Dia. uniformity in the long. Section: 12μm;
3. Surface roughness: Ra0.32μm.

Application and Features
1. Plain-type cylindrical grinder, mainly used for grinding cylindrical surface requiring accuracy-class IT6-IT7, suitable for single-piece or small batch production;
2. Worktable long. Movement is carried out by means of hydraulic drive with infinitely variable speed, or by hand wheel drive. Wheel head cross feed is provided with auto. Hydraulic micro intermittent-feed and rapid advance & retract, and also with rough and fine feed by means of hand wheel;
3. Work rotating speed of CG800H Cylindrical Grinding machine is realized in accordance with the electric-adjusted infinitely-variable-speed, and driven by AC frequency-conversion motor;
4. Wheel spindle is supported by hydro-static-pressure bearings, for raising ground surface quality;
5. Wheel head cross feed is provided with magnetic-grating digital display unit for displacement, and also equipped with grinding indicator for the convenience of operation;
6. Open-type screw-throttle hydro-static-pressure guides are adopted as wheel head carriage and worktable guides with stable working;

Standard accessories
1. Grinding indicator: 1sets;
2. Wheel periphery dresser: 1set;
3. Wheel periphery and end-face dresser: 1set;
4. Open-type steady-rest: 1sets;
5. Wheel hub: 2set;
6. Measuring bridge-plate: 1pc;

Optional Accessories
1. Center grinding device;
2. Wheel balancing stand;
3. Radius dresser;
4. Steady-rest Ø400--Ø500mm;

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 indicator: 1sets;
2. Wheel periphery dresser: 1set;
3. Wheel periphery and end-face dresser: 1set;
4. Open-type steady-rest: 1sets;
5. Wheel hub: 2set;
6. Measuring bridge-plate: 1pc;

Optional Accessories
1. Center grinding device;
2. Wheel balancing stand;
3. Radius dresser;
4. Steady-rest Ø400--Ø500mm;

Technical Specifications of CG800H Cylindrical Grinding Machine

Model		Unit	CG800
Type			H
Center height		mm	500 (20″)
Work length to be ground		mm	3000,4000,5000 (118″,157″,197″)
Work dia. To be ground		mm	Φ50-800 (2-31″)
Max. work height		kg	3000
Headstock and tailstock center tapered-bore			Metric 80#
Headstock driving-plate rotating-speed (stepless adjustable)		r/min	7-70
Wheel peripheral velocity		m/s	17.5 / 35
Min. intermittent feed (coarse/fine)		mm	0.02 / 0.0025
Machine weight (Net/Gross Weight)	3000	kg	13000 / 17500
	4000	kg	15000 / 19000
	5000	kg	Case 1: 21000 / 26000 Case 2: 5000 / 6500
Package Dimension: (LxWxH)	3000	mm	8850 x 2950 x 2350
	4000	mm	10800 x 2950 x 2350
	5000	mm	Case 1: 13100 x 2750 x 2100 Case 2: 3300 x 2250 x 2200

Working accuracy
1. Roundness: 2.5μm;
2. Dia. uniformity in the long. Section: 12μm;
3. Surface roughness: Ra0.32μm.

WF45 Toolroom Milling Machine

MF25V Variable Speed Universal Turret Milling

GMC3227B CNC Bridge-type Gantry Machining Center

GMC0916 CNC Gantry Type Machining Center

HMC800H Double Position Horizontal Machine Center

CG800H Cylindrical Grinding Machine

CG500H Cylindrical Grinding Machine

CG500C Cylindrical Grinding Machine

CG200A Cylindrical Grinding Machine

CCG600H Crankshaft Grinder