Slewing bearing manufacturer
Slewing ring bearings are also called turnable bearings. The main structure includes: inner ring, outer ring, rolling elements, and rolling element-guided cages. They are important transmission components in mechanical equipment. They are used in engineering machinery, light industrial machinery, metallurgical machinery, medical machinery, Ship equipment and other industries are widely used. Today, We will take you to understand the manufacturing process and detailed steps of slewing bearings.
1. Slewing bearing steel material cutting
The commonly used raw material for slewing bearing is integrally hardened carbon chromium bearing steel, and the slewing ring is made of surface hardened steel, generally made of 50Mn steel, such as: C45, 42CrMo. The cylindrical raw material billet transported back from the steel mill is cut according to the size required for processing the bearing. Generally, carbide saw blades should be used for cutting bearing steel, which have high hardness, wear resistance, strength and toughness, heat resistance, corrosion resistance, etc. A series of excellent properties.
2. Slewing bearing billet forging
In a heating furnace, the billet is heated and forged into a round cake shape. The forging link is an important link to ensure the reliability and life of the bearing. After the raw material is forged, the bearing ring blank is formed. At the same time, the organization structure of the raw materials becomes denser and the flow linearity becomes better, which can improve the reliability and service life of the bearing. In addition, the quality of the forging process will directly affect the utilization rate of raw materials, thereby affecting production costs.
3. Slewing ring forged ring
The steel blank is forged into a ring-shaped steel ring using a ring rolling machine. Forging can improve the internal structure of steel and improve the strength, plasticity, impact toughness and other mechanical properties of steel.
4. After the forging comes into the factory, the quality inspector will check the appearance and measure the dimensions to ensure that there is no obvious defect, and there is enough margin to be processed to the finished product.
5. Rough turning
Deoxidized rough car, according to the size of the finished product, reserve different size allowances
The steel ring after the ring is loaded into the machine tool, and the rough turning of the machining is carried out. Various groove raceways are turned out, and the steel ring is fixed on the gear milling machine to cut teeth. The main purpose is to make the shape of the ferrule after the final product the same, creating conditions for the later grinding machine processing.
Ultrasonic flaw detection is to perform ultrasonic flaw detection on forgings after rough turning to detect whether there are pores, slag inclusions, laminates and other defects inside the material. According to the special requirements of international or customers, the forgings after rough turning are quenched and tempered to improve the overall mechanical properties. Quenched and tempered hardness test.
6 Turning before quenching
The raceway is finely turned into a shape, and different dimensional allowances are reserved according to different raceway structure types and sizes, which can eliminate the deformation of the bearing.
7 Slewing bearing quenching (heat treatment)
After machining, through quenching operation, the strength and hardness of the steel are improved, and the wear resistance, fatigue strength and toughness of the metal are improved. The heat treatment process is to subject the forged and machined bearing ring to high temperature treatment, which directly affects the uniformity of carburization in the bearing ring, improves the wear resistance and hardness of the bearing, and also affects the reliability and life of the bearing. Important link.
After quenching, a tempering stabilization treatment is carried out to reduce subsequent processing deformation and reduce the risk of raceway cracking.
8. Detect the hardness, effective depth and cracks of the quenching zone, especially the starting position.
9. Machining the datum plane to prepare for the subsequent processing of teeth, holes and other processes.
10. According to different types of tooth profile, gear shaping, gear hobbing, gear milling, etc. can be selected for the slewing support, and the accuracy can reach 7-10 grades. If higher precision is required, gear grinding can meet 4-6 grades.
11. In order to meet the tooth strength and service life, high-frequency quenching is carried out on the tooth surface, tooth heel and tooth top according to different needs.
Hardness HRC40-55, depth 1.5mm, after quenching, tempering stabilization treatment is carried out to eliminate quenching stress, reduce the risk of cracking in the quenched part, and perform hardness and crack detection at the end of stability.
12. Hole processing of slewing bearing
Perforate the installation hole drilling operation on the end face of the steel ring. When drilling the slewing bearing bearing, the center and cutting angle should be determined, and the drilling machine, hand-held electric drill and hand-operated drill should be selected for operation. During the process, the chord length, wall thickness, aperture and other items are controlled and corrected in time, and the threads with high precision requirements are inspected.
Finishing is to trim the fine parts of the bearing roughly formed after drilling to ensure the refinement of the appearance. Finishing has an effect on the rotation flexibility of the bearing and the precision of the bearing surface. Once again, the raceway surface of the steel ring is refined. Modify the deformation caused by the previous process. Effectively control the ellipse, wall thickness and flatness of the ferrule.
14 Matching clearance
Trial clearance according to customer drawings.
15. Assembly of slewing ring
Assemble parts (outer ring, inner ring, roller, cage) processed through various processes, such as inserting steel balls, spacers, and inserting butter seals. Rotation detects whether the rotation is flexible and there is no abnormal noise.
16 After the assembly is completed, check the various indicators and make detailed records.
Seventeen slewing bearing finished packaging，Coat the finished bearing with anti-rust oil and pack it.