Machine tools – a strategic industry, forms the backbone of many if not all of the major sectors of industrial activity in a country in the traditional manufacturing context. Therefore, a country such as India which is on the threshold of becoming a major global industrial and economic power must have a strong, well-developed, robust and modern machine tool industry to support and assist its manufacturing sector.
The machine tool industry in India has played and will continue to play a key role in enhancing competitiveness and enabling development of quality and excellence in the output of the manufacturing industry and of the Indian economy as a whole.
The objective of machine tools is to meet the ever-increasing demands of modern industry for faster speeds, greater accuracy, smoother finishes and higher production rates at minimum costs. Such considerations are primarily influenced by the machine tool spindle with its super precision ball bearings which are categorized as ...................
Precision, Super precision and Ultra Precision Angular Contact Ball Bearing or Spindle Bearings of type 70, 72, 79, BNR, BGR, BTR with 15°, 20°, 25° contact angle in tolerance class P3, P4, P5 & P6 are usually used as multiple bearing sets to achieve light, medium or heavy preload. There are three types of combinations i.e Back to Back, Face to Face and Tandem. Two row (paired) three row (triplex) and four row (Quadruplex) are the most popular multiple bearing sets.
Precision Ball Screw Support Bearings of type BSB, TAC are high precision angular contact thrust ball bearings to support precision ball screws. Ball screw support Bearings have a 60° contact angle and are manufactured to P3 & P4 tolerances and are normally available as universally faced mached pairs or sets in triplex and quadruplex with a light, medium and heavy preload as per the requirement.
Precision Taper roller bearings consist of four basic components-the inner race (cone), the outer race (cup), tapered rollers and cage - The cone, rollers and cage form an assembly which is separable from the cup.
To cater and support to the ever-increasing demand for precision machine tool components; manufacturers such as FAG BARDEN, NSK-RHP, GAMET, FAFNIR, GMN, SNFA around the world compete to achieve excellence in their productivity by upgrading their present expertise or by introducing new products and technology for giving an advanced and economic solutions to the global needs.
Full complement cylindrical roller bearings incorporate maximum number of rollers and are without cage; Full complement cylindrical roller bearings of single row and double row have extremely high load carrying capacity and high rigidity and are pre-fixed as SL, NCF, NJG, NNC by reputed manufacturers such as FAG, INA, SKF and NSK.
Bearings for screw-drives are axial angular contact ball bearings and axial needle and cylindrical roller bearings that can support high radial forces as well as axial forces from one or both sides. These bearings are identified by prefix ZKLF, ZKLN, 7602, 7603, ZKLR, ZARF, ZARN
Bearing manufacturers such as INA, IKO, NTN, THK, MCGILL are primarily involved in production of bearings falling under the category of Needle roller bearings.
Stainless steel deep groove ball bearings have the same deep raceway grooves and close conformity between raceways and balls as standard deep groove ball bearings. The special feature of stainless steel bearings is that they are resistant to corrosion from moisture (Water) and several other media. They can withstand temperature upto 280 ° C hence can be used under moderate high temperatureThey can carry radial and axial loads in either direction, even in the case of an elevated speed of rotation. Stainless steel bearings are available open type as well as with seals for preventing foreign particles entering in the rolling elements.
EZO Japan is one of the prominent brands offering stainless steel bearings apart from several european manufacturers.
Plastic bearings are of significant advantages for both the designer and the user. The inner and outer race is made of polyacetal and cage is polyamide 6.6 with glass balls. Plastic bearings are lighter in weight, non-magnetic, and have a low coefficient of friction. Plastic ball bearings are ideal for installation in all hostile environments where aggressive media, alkalis, acids, vapors or even water could come into contact with the bearings However, due to the physical limitations of plastic materials, plastic ball bearings cannot attain the rotational speeds, ambient temperatures and load capacities offered by steel rolling bearings. On the other hand, the excellent chemical resistance of plastic deep groove ball bearings opens up a host of other applications and, because they are highly resilient, their long service life is virtually maintenance-free.
STAR Rexroth Germany is a pioneer in manufacturing of Plastic bearings. And also there are a number of other makes of Far East and European origin involved in manufacturing Plastic bearings
One-way clutch bearings or Freewheels are directional couplings, which means that the driving member rotates the driven member in one direction, while automatically disengaging itself from the driven part when the direction of rotation is reversed. Makes such as Stieber (Germany) , CTS (Italy) and Tsubaki (Japan) are available in one-way clutch bearings