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Posted on Jun 13, 2019
In the field of grinding machines, surface grinders are used to create a smooth finish on a flat surface of a work piece. It is a widely used abrasive processing technology. The grinding wheel is covered in rough particle materials, cutting the chips of metal or non-metal materials from the work piece to make its surface smooth and flat.
In the field of grinding machine, surface grinder is used to create a smooth finish on a flat surface of a work piece. It is a widely used abrasive processing technology. The grinding wheel is covered in rough particle materials, cutting the chips of metal or non-metal materials from the work piece to make its surface smooth and flat.
:: Read more : What are grinding machines?
During the process of surface grinding machines, large amount of surface contact between the grinding wheel and the work piece, rotary surface grinding is a very effective method among all grinding machines. Each rotation of the rotary table brings the entire surface to be ground into contact with the surface of the grinding wheel.
In many applications, customized, electromagnetic, mechanical, vacuum, pneumatic or hydraulic holding devices are required by grinding machines. Many manufacturing teams specifically design and produce different work piece holding devices to meet customer manufacturing procedures and obtain repeatable quality, accuracy and productivity.
In addition, the variable speed rotary table is equipped with a variable force electromagnetic chuck and electronic induction as standard. Vacuum, pneumatic or hydraulic modes are the configuration features of most rotary surface grinders on the market today. Surface grinding machines are the most common machine tool that being a finishing step. And they use rotating grinding wheel to smooth the work piece surface. The process of surface grinding machines are by removing the oxide layer and burrs on the surface of the work piece, the metal or non-metal work piece will have a more refined appearance.
:: Read more : How to pick the best Surface Grinding Wheel
After the grinding process, the desired surface can be obtained. The surface grinder is composed of a grinding wheel, a work piece holding device or a chuck with a hydraulic cylinder, and a reciprocating or rotating table.
Grinding machines and milling machines are both common machine tools used in the metal processing industry. They are performed by removing material from work pieces. Milling is conducted on milling machines. Milling machines use cutting blades against work piece while the work piece is hold in place and doesn’t rotate. On the other hand, grinding machines use a disc shape grinding wheel to perform materials removal.
The chuck is also one of critical components for surface grinding machines and is used to hold the work piece in the proper position during processing. It can use one of the following two methods: The first is the magnetic chuck, which is used to hold the ferromagnetic work piece in the appropriate position. The second is a vacuum or mechanical method to hold non-ferromagnetic and non-metallic work pieces in place.
If only magnetic chucks are equipped on the machine, additional mechanical vices can be installed on the magnetic chucks to hold non-ferromagnetic work pieces. The influencing factors to be considered in surface grinding are the material of the grinding wheel and the material of the work piece. Typical work piece materials include cast iron and mild steel. These two materials will not clog the grinding wheel during processing. Other materials include aluminum, stainless steel, brass and plastic.
When grinding at high temperatures, the material becomes fragile and more susceptible to corrosion, which also causes magnetic loss of the work piece material. Grinding wheels are not limited to cylindrical shapes, and can have a variety of options that help shape the work piece into different appearances.
Straight wheels can be dressed by the operator to produce customized geometries. When the surface grinder is grinding, it must be noted that the shape of the grinding wheel will be transferred to the work piece like a reverse image as a physical limitation.
On the other hand, spark out is a term used when seeking precision values, which literally means "until the sparks are out (no more)". It involves passing the work piece under the grinding wheel without resetting the cutting depth, and usually multiple times. This ensures that any inconsistencies in the machine or work piece are eliminated.
With regard to grinding precision, a surface grinder is a type of grinding machines used to provide precision grinding surfaces to achieve critical dimensions or surface finish. The typical precision of a surface grinder depends on its application. However, the precision of most surface grinders and rotary surface grinders should be ±0.002 mm.
There is a working table in the grinding machine, which can move longitudinally and across the surface of the grinding wheel. Longitudinal feed and cross feed are usually hydraulically driven, but depending on the application of the grinder, manual, electric or hydraulic hybrid methods can also be used.
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