How are the bearing steel balls made?

- Sep 11, 2020-

1. The simple production process of steel balls


Ball blank forming → ring belt removal → rough grinding → soft grinding → heat treatment → ball blank forming → light ball (or filing → soft grinding) → hard grinding → fine grinding → fine grinding (or polishing) → super fine grinding.


Second, the detailed production process of steel balls


1. Wire drawing (wire drawing):


Stretch the wire to the required wire diameter with a wire drawing machine;


2. Cold heading (forging):


Put the drawn wire into the steel ball cold heading machine, and upset it into a ball embryo by the steel mold in the machine;


3. Light ball:


The two cast iron grinding ball discs in the photo ball machine rasps the cold heading ball embryo under pressure to remove the outer ring and two poles on the ball embryo;


4. Soft ball:


The two cast iron grinding ball discs in the soft ball machine rasps the photosphere ball embryo to grind the ball embryo to the required ball diameter and surface roughness;


5. Heat treatment:


Put the ball into the heat treatment furnace, carburize, quench and then temper to make the ball have a certain carburized layer, hardness, toughness and crushing load;


6. Hard grinding:


The grinding wheel disc in the grinder presses and grinds the heat-treated ball embryo to remove the black oxide layer on the surface of the ball and correct the accuracy of the ball;


7. Lapping/polishing cleaning:


Lapping: the grinding ball embryo is finely ground in the lapping machine to make the ball reach the required precision and smoothness of the finished product;


Polishing and cleaning: Pour the ball into the polishing drum and rotate it and clean it with polishing detergent and water to make the spherical surface clean and bright;


8. Appearance selection:


Use manual visual inspection to check the surface of the steel ball for any flaws, and use a micrometer to measure the roundness, batch diameter variation, and use a surface roughness meter to detect the surface roughness as the final inspection;


9. Packaging:


Coat the steel ball/stainless steel ball/bearing steel ball with anti-rust oil and pack it into a carton or woven bag.


10. Shipment:


On the premise of customer requirements, packaging and shipping must be carried out in accordance with customer requirements!