What types of grinding heads are available for coordinate grinders?
There are several main types of grinding heads for coordinate grinding machines:
I. Classified according to the power source:
Electric grinding head: It is a more common type of grinding head with the advantages of stable rotational speed and large output power, which can meet the needs of different grinding processes. For example, some of the Swiss Hauser coordinate grinding machines equipped with electric motor grinding head, its speed can be adjusted according to different processing requirements, the highest number of revolutions up to 80,000 rpm, the lowest number of revolutions of 9,000 rpm, can be grinding parts with a wide range of hole diameters.
Pneumatic Grinding Heads: Also known as air-operated grinding heads, they are characterized by high rotational speeds and low vibration, and are suitable for high-precision grinding processes. Since compressed air is used as the power source, a stable air supply system is required to ensure the normal operation of the grinding head. The speed of the pneumatic grinding head can usually reach a high level, and in the process of processing can be a fast response, suitable for processing precision and surface quality of parts requiring high processing.
Second, according to the abrasive material classification:
Ceramic grinding head: sintered by the ceramic bond, the grain size sand used is generally brown corundum, white steel jade, chrome corundum, silicon carbide, etc., with good abrasion resistance and cutting performance, can maintain the shape of the grinding head in a longer period of time precision, suitable for a variety of metal materials for grinding and processing, can be used for the grinding of the inside of the aperture, the correction of molds, etc., and in the process of machining can be obtained with a high degree of dimensional accuracy and low surface roughness. It can obtain high dimensional accuracy and low surface roughness in the process.
Diamond Grinding Head: It includes a base body and countless grinding bodies, multiple grinding grains are fixed in the base body at intervals, and the grinding bodies are made of diamond alloy material. Diamond grinding head has very high hardness and wear resistance, can grind all kinds of cemented carbide, glass, ceramics, sapphire and many tough, super alloy and different hard brittle non-metallic materials in small holes or tapered holes, etc., the processing hardness can reach HRA ≥ 85, and grinding processing quality is high, the whole process is convenient to grasp, simple to use, no need to dress, safe and reliable.
Cubic Boron Nitride (CBN) Grinding Heads: Electroplated CBN coordinate grinding heads are suitable for high-speed precision grinding, internal grinding, small diameter hole processing and dressing high carbon, high-speed steel, tool and die steel and other high hardness and tough materials, with high material removal rate, easy to cut and low heat generation, etc., compared with the ceramic bond grinding head, both economic and affordable, and does not require frequent dressing, can be used for nozzles, bearing rings, compressors and steering It can be used for the processing of nozzles, bearing rings, compressors and steering pumps.
Third, according to the grinding mode classification:
Radial feed grinding head: mainly using the circumferential surface of the grinding wheel for grinding, feed each time the grinding wheel along the direction of the eccentric radius relative to the workpiece for a small amount of movement, is one of the most common grinding method, suitable for grinding a variety of internal holes and external cylindrical surfaces, when the use of ceramic bonded wheels, you can obtain very high dimensional accuracy and very low roughness.
Plunge-cut grinding head: The end face of the grinding wheel is utilized for grinding, also known as endface grinding, and the grinding wheel is fed along the axial direction when feeding. Since heat and chips are not easily discharged, the grinding conditions are relatively harsh, so the end face of the grinding wheel should generally be corrected to a medium concave shape, and special care is needed when grinding to avoid overfeeding and causing the grinding wheel to burst, which is usually used in special cases such as grinding table shoulder surfaces, spherical surfaces, and end surfaces.
Insert Grinding Head: The grinding wheel moves up and down rapidly while grinding around the contour of the part to be ground, which is characterized by a larger depth of cut and generates less heat, and at the same time, the runout requirement of the grinding wheel is relatively low, so it is especially suitable for the use of plated wheels for the grinding of the contour of the occasion, and it is used more often in the grinding of small holes, and it can get a lower roughness than the radial-feed type of grinding.
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