Table of Contents
How is a ball bearing made?
The manufacturing process for ball bearings can be broken down to four components: the outer race, inner race, rolling balls and cage formation. Both the inner and outer races are made using a similar process. Starting with steel tubing, machine cutting tools cut the tubing slightly larger than the race shape.
What material is used for bearings?
Most ball bearings are made of a type of steel known as high carbon chromium steel, often called chrome steel. This is used for reasons of cost and durability. Bearings are also made from other materials such as stainless steel, ceramics and plastic.
How are bearing cages made?
Solid cages are made from brass, steel, light metal or textile-laminated phenolic resin. They are manu- factured either by machining, by injection moulding of plastic materials or by sintering metals.
How are steel balls made for bearings?
Metal bearing balls are manufactured from steel wire or rod. During the first step in the process, the wire or rod is cut into small pieces called slugs. The volume of material for the slug is slightly larger than that of the finished ball. The excess material is removed in subsequent machining steps.
What kind of steel are ball bearings made of?
The most often used material is a chrome steel with about 1% carbon and 1.5% chrome. The properties of steel balls of martensitic chrome steel make them especially well suited to ball bearing production, since they make stable components that are resistant and convincingly durable in continuous operation.
What are the parts of a bearing?
The standard essential components of a bearing are as follows: Inner Ring: The Inner Ring is the smaller of the two bearing rings. Outer Ring: Rolling Element: (Balls, Cylindrical Rollers, Spherical Rollers, Tapered Rollers, Needle Rollers): Cage (Retainer): Lubrication: Other Optional Bearing components:.
What kind of wood is used for bearings?
Wood bearings are made from lubricant-filled maple wood to make it self-lubricating. Wood bearings absorb debris and are ideal for corrosive and abrasive applications where grit, fine contaminants and moisture are present.
What makes a good bearing?
As a rule of thumb: thick grease and fully packed bearings make for high durability and high friction. Thin grease and a low filling degree make for low friction, but will require to service the bearings more often. There is a whole range of additives that can be mixed with a grease formula to manipulate friction.
Which metal alloy is used to make bearing?
White metal or Babbit metal: The white metal is used for making bearings that are subjected to heavy load. The white metal is an alloy of Lead and Lithium metal. These alloys usually consist of relatively hard crystals embedded in a softer matrix, a structure important for machine bearings.
Which polymer is used in making ball bearing?
Polypropylene (PP) or polyoxy-methylene (POM) are the standard materials used for the bearing rings, but other polymers are also possible on request.
Why brass cage is used in bearing?
Brass cages offer high rigidity, high strength and can be used at high temperatures. They also offer the key features of absorbing lubricant and performing well in aggressive environments where lubrication is marginal.
Why is brass used in bearings?
Excellent hardenability makes ductile iron a good choice for gears, bearings, camsand other high strength parts. High conductivity, good corrosion resistance and excellent ductility. More than99. 3% pure copper. Alloy Type Description 360 A commonly used brass that is excellent for machining.
What are bearing cages made of?
Materials. Some bearing retainers or bearing cages are made of metals such as heat-treated aluminum, solid bronze, or pressed steel. Others are made of non-metal materials such as nylon, PTFE, or phenolic resins. Pressed steel is a common choice.
How were ball bearings first made?
The first patent for a ball bearing was granted in 1794 to Philip Vaughan, a Welsh ironmaster and inventor. His patent was for a ball bearing with iron balls that ran inside deep grooves and that were sealed in place by a stopper.
How hard is a ball bearing?
Steel uses what is called the Rockwell C scale, and ball bearings are of course hard. This hardness allows them to rotate and not wear, at least for a while. The bearings surfaces of the hub cone and cup typically have a Rockwell C rating of 55 to 60. A steel ball bearing is likely to be over a Rockwell C of 60.
What is bearing math?
In mathematics, a bearing is the angle in degrees measured clockwise from north. Bearings are usually given as a three-figure bearing. For example, 30° clockwise from north is usually written as 030°.
What are SKF bearings made of?
SKF bearing rings and washers are made of steel in accordance with SKF specifications. They cover all aspects that are relevant to providing a long service life for the bearing. Depending on specific requirements, SKF uses stainless steels or high-temperature steels.
What is the bearing number?
A bearing number is composed of a basic number and a supplementary code, denoting bearing specifications including bearing type, boundary dimensions, running accuracy, and internal clearance.
How are ceramic bearing materials made?
Use of ceramics as bearing materials. Material Density (g/cm 3 ) Tensile Modulus (GPa) Alumina (99.9%) 3.96 300-400 Silicon Carbide (sintered) 3.15 200-450 Silicon Nitride (sintered) 3.11 280-310 SiAlON* 3.24 280-300.
What are ceramic balls made of?
Balls are made of ceramics (fine ceramics), are made from two types: non-oxide ceramics (such as silicon nitride) and oxide ceramics (such as alumina and zirconia).
Are titanium skateboard bearings good?
Titanium coated ball bearings are more resistant to pitting and damage from skating, as titanium is a tougher and more dense material than steel. Titanium coated ball bearings are more precise than steel ball which means less friction and heat, thus more speed.
