Ball Bearings are an important component in contemporary machinery and equipment, its main function is to support the mechanical rotating body to reduce the friction coefficient during its movement and at the same time ensure its rotary accuracy. Ball bearings are the most common type of bearing in the light industrial machinery industry. Spherical alloy steel balls are mounted in the middle of the inner and outer steel rings to reduce friction and improve the efficiency of mechanical power transmission.
A metal wire of about the same diameter as the final metal ball is placed in a head forming machine. This machine has a metal cavity with a cavity
each end is a hemisphere. It will forcefully close and cut the wire, thus pressing the section of metal closed in the cavity into a ball.
The machine is a spherical machine.
This process leaves a ring of metal on the surface of the ball (known as mould overflow). As a result, the balls produced by this machine look somewhat like Saturn.
The small ball from this machine looks somewhat similar to a Saturn.
Next, the ball is put into another machine to remove the mould spill. This machine rolls the ball between two heavy, hard steel plates called
These two plates are called grooved plates.
One plate is stationary and the other is rotating, the upper part of these two plates are machined with four grooves to guide the coating ring.
The grooves are filled with balls when the ring is in line. When a ball is rolled out of one groove, it falls into the opening of the plate, where it is tumbled for a moment and then enters another groove.
where it rolls for a few moments and then enters another groove. This ensures that each ball passes through many different grooves, so that even if the grooves are of different sizes, the size of the balls coming out will be the same.
so that even if the grooves are different in size, the ball comes out the same size.
As the ball passes through the grooves it is constantly rotated and tumbled, so that the burrs are ground off and the ball is squeezed into a spherical shape. This is a bit like
Kneading dough by hand. The process of squeezing the ball compresses the metal, thus making the surface of the ball very hard. The ball is metal and during this
A lot of heat is generated during this operation, so water must be poured over the balls and plates to cool them.
The variables in this process include the pressure that squeezes the two plates together, the speed of rotation of the plates and the time that the balls remain in the machine. By setting these variables appropriately, the correct size ball can be manufactured.
Heat treatment of the ball will increase the hardness and strength of the pellet. Firstly, the ball is heated to around 810°C. To avoid cracks during quenching, the ball is generally cooled in oil to 60°C. The ball is then heated to around 170°C (low temperature tempering) with the aim of maintaining the high hardness and wear resistance of the quenched workpiece and reducing residual quenching stresses and brittleness, while also obtaining a uniform internal organisation after the entire heat treatment process.
Next, the ball goes into the polishing process. The same type of machine is used, but this time with the addition of a
abrasive to the coolant. After the ball has passed through the groove again, the surface is polished smooth and the size is compressed to its final size.
This time, the same type of machine is used, except that this time the plates are made of softer metal and the machine squeezes the two plates with less pressure.
The pressure on the two plates is also much lower. In addition, the machine uses a polishing agent rather than an abrasive. This process does not remove
The surface of the tumblers becomes very smooth and shiny without removing any material.
The worker measures the ball with very precise tools to determine whether it meets the specified tolerances. A three-stage ball with a diameter of approximately 0.6 cm must have a diameter range of between 0.63492 cm and 0.63508 cm. At the same time, the difference between the minimum and maximum diameter of the measured ball must not exceed 0.008 microns.
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