Ball bearing manufacturing process

This is a presentation about ball bearing manufacturing manufacturing process. There are mainly 6 parts of knowledge included in this presentation. Please visit

1. Ball Bearing Manufacturing Basic Knowledge Fitrun Bearing Co., Ltd. Made by: Kenneth Huang November 2012

2. Contents Ⅰ. Bearing MFG Basic Process Ⅱ. Bearing Material Ⅲ. Forging Process Ⅳ. Turning Process Ⅴ. Heat Treatment Ⅵ. Grinding Process Ⅶ. Bearing Assembly

3. Ⅰ. Bearing MFG Basic Process Bearing Ring (Outer and Inner) Material Forging Turning Heat Treatment Grinding Assemble Roller Material Turning Heat Treatment Grinding Assemble Cage (Brass Cage) Material Casting Turning Milling Deburring Assemble

4. Ⅱ. Bearing Material Bearing Ring and Roller Material NO Material Performance 1 High surface load capacity 2 Good abrasion resistance 3 High elastic limit 4 Good hardness 5 Toughness 6 Good size stability 7 Good rust resistance 8 Good processing performance Common Material: High-carbon chromium bearing steel: Gcr15 Gcr15SiMn Other Material: Carburized bearing steel Abrasion and corrosive resistance bearing steel Heat resistance bearing steel

5. Bearing Cage Material Non-ferrous metal: Brass HPb59-1, bronze QAL10-3-1.5, Aluminum alloy LY11CZ Ferrous Metal: Quality carbon steel thin plate Non-metal: Engineering nylon, Phenolic adhesive

6. Ⅲ. Forging Forging is the preliminary processing of bearing ring making, it’s also named blank processing. The main purposes of bearing ring forging processing are: 1. To obtain the semi-finished ring which is similar with the bearing, so as to enhance the efficient of metal material and reduce the mechanical machining work, and at last to save the cost of production. 2. To eliminate the inner defect of metal, improve metal organized system, so as to make the metal be with proper streamline distribution and with good compactness, and at last to enhance the life span of bearings. Forging Hot Forging —— metal is heated to be above the crystallization temperature widely used. Cold Forging —— metal is forged in the room temperature barely used. Warm Forging —— metal is forged in the temperature between hot forging and cold forging in test period.

7. Bearing Ring Forging Procedure Heating Cutting Air Hammer Press Plain Forging Machine Staving Machine Shaper Anneal Semi-finished Products Material Heating 800℃～1100 ℃ 800℃～1100 ℃ 780℃～810 ℃

8. Ⅳ. Turning Turning is for semi-finished bearing ring and roller, it’s also called forming process. The main purposes of turning: 1. To make the bearing ring and roller be the same shape with the finished products. 2. To create good condition for the coming grinding processing. Turning Integrated Processing: to finish all the turning procedure in one machine --- suitable for small quantity production. Distributed Processing: to finish only one turning procedure in one machine --- suitable for large quantity production.

9. Bearing Ring Turning Process semi-finished ring inner face Outer face grinding marking roller rail oil groove Chamfer Semi-finished products Roller Turning Process Steel Material Outer Face Cutting Outer Face Curvature Chamfer Semi-finished Products Usually, the equipments used are specially for bearing processing, and are arranged according to the distributed procedure follow.

10. Ⅴ. Heat Treatment Heat treatment is the key processing procedure to enhance the bearing inner quality. The main purposes of heat treatment: 1. To change the material structure through treat treatment so as to enhance its mechanical performance. 2. To enhance the bearing inner quality (abrasive resistance, toughness, etc), so as to enhance the bearing life span. Semi-finished ring quenching cleaning tempering 2 nd quenching Quenched semi-finished products Bearing ring and roller heat treatment process 800℃～ 840 ℃ 190℃～210 ℃

11. Ⅵ. Grinding Grinding is the final processing of bearing ring and roller, it is called finished product processing. The main purposes of grinding process: 1. To make the bearing ring and roller be in accordance with the design requirements in size and shape precision. 2. To prepare qualified rings and rollers for bearing assembly. Grinding Normally, it’s processed by distributed procedure; or the machines can be connected to integrate into a production line by material loading and unloading equipments so as to enhance the production efficient.

12. Bearing Ring Grinding Process Roller Grinding Process Quenched semi-finished ring Facing Inner or Outer Diameter Roller Channel Tempering Roller Channel Grinding Outer Diameter Finished Ring for ASSY Quenched semi-finished roller Facing Outer Diameter Vibrating Finishing Finished roller for assembly

13. Ⅶ. Bearing Assembly Bearing assembly is the final process of bearing manufacturing; it has very important effect to the bearing performance. The main purposes of bearing assembly: 1. To assemble the finished components (out rings, inner rings, rollers and cages) into finished bearings. 2. To assemble the finished components into a variety of precisions, clearances and special requirements of bearings according to different technological requirements.

14. Finished inner ring and outer ring Finished roller Cosmetic Inspection Roller diameter size selection Inner ring and outer ring roller rail inspection and size selection. Roller diameter size selection Match clearance Assemble Cage Final Inspection Final Inspection Cleaning Anti-rust Treatment Vacuum Inner Packaging Outer Packaging Warehouse storage or shipping Bearing Assembly Process Inner ring and outer ring roller rail inspection and size selection. Bore diameter, outer diameter and thickness inspection.

15. Above is the simple presentation of bearing manufacture basic knowledge. Hope you have had a preliminary knowledge of bearing manufacture. Bearing manufacture has many processing procedures and requires high machining precision even though the bearing is just common standard component. In order to produce high quality and high precision bearing products to meet customers’ requirements, in addition to above work mentioned , we still have a lot of work to do as a ball bearing manufacturer . We, Fitrun Bearing Co., Ltd., will keep hard working to exceed customers’ expectation. Our main bearing products are: deep groove ball bearing, flanged ball bearing and thrust ball bearing . They are miniature sizes from BD of 1m to 12mm, and OD of 3mm to 40mm.