A cylindrical grinder is a specialized form of grinder used to shape the outside of an object. It can work on a variety of shapes, such as cylinders, rods, cams, or crankshafts. Cylindrical grinders can be categorized by their working mechanism, which are traverse grinding and plunge grinding. They can also be classified based on the workholding method. The grinding wheels, coolant, maintenance, and other grinding parameters can all vary depending on the application.
Although cylindrical grinding is a common operation for bringing finished parts to tolerance, the operator must be familiar with the machine itself. This includes knowing how to utilize different wheels, workholding methods, and coolants to ensure desired result. The basic know-how is crucial for reducing scrap, increasing grinding quality and production rates, as well as lowering cost.
The construction of a cylindrical grinder consists of five main components: the headstock, the tailstock, the grinding wheel, the wheelhead, and the table. Advanced models may be computer controlled (e.g. CNC cylindrical grinders) or have multiple wheels.
The headstock and tailstock are mounted on the table as it moves laterally. The table consists of an upper and a lower layer. The upper table can be adjusted to a small angle to perform conical grinding. The high-speed rotating grinding wheel along with the wheel frame is used for lateral feed movement.
When putting everything in motion, the workpiece is first supported between the headstock and tailstock, and rotates rapidly between the centers. The grinding wheel, which rotates at various speeds against the workpiece to perform grinding, is attached to the wheelhead. This moves the grinder in either plunge or traverse motions.
See the below video for an in-depth look at the construction and operation of cylindrical grinders:
There is a wide variety of cylindrical grinders, but can essentially be classified into three groups.
Plunge Cylindrical Grinder
This type of grinder features high productivity. When the part to be ground is less than the grinding wheel in width, the grinding wheel is only required to be fed in the transverse direction, and the workpiece does not have to move relative to the wheel in the axial direction.
Angular Cylindrical Grinder
The angular approach is suitable for tight tolerance requirements on angles or tapers, as well as generating the required faces and diameters simultaneously. This type of grinders is fast, quiet, and powerful that excels in high volume production. For certain multi-form plunge applications, this type of machine will do the job, too.
Figure 3. Universal Cylindrical Grinder, E-Tech Machinery
The cylindrical grinder was developed in conjunction with the progression of industry and the relative technologies. In any applications where extremely precise metal working is needed, a cylindrical grinder is able to provide a high level of precision machining. Cylindrical grinders are largely used in the following industries:
Engine case grinding is the most popular cylindrical grinding application. Other automotive parts that are commonly ground with a cylindrical grinder include shock absorbers, crank, and camshafts.
Cylindrical grinding machines are widely used in the textile industry for yarn processing. The operation is often performed in conjunction with other machinery such as a texturing machine, combing machine, thick yarn machine, etc.
Cylindrical grinders are often used in the orthopedic segment for implants such as femoral knees, tibia trays, etc. The machines used are typically equipped with CNC capability with multiple axes.
Cylindrical grinders also take part in other sectors such as military and aerospace. They are often used to manufacture a variety of office and communication equipment as well, such as copiers, printers, face machines, etc.
For users to choose an appropriate cylindrical grinder, the control system is the key. Most cylindrical grinding machines are now controlled by either NC or CNC controllers to eliminate the problems that a conventional grinder would have. Before you look into the spindle, wheel, working table, etc., you need to check the controlling unit first to ensure smooth and coordinated workflow.
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