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Quality Control

Our company has passed the ISO 9001 quality system certification in 2008, and implemented the JB/T 2003-2011 standard and the corresponding national standards. The company has complete testing equipment and advanced testing methods. In the production process of products, strict implementation of the whole process inspection to ensure that each set of products are qualified . Over the past three years, our product inspection pass rate has exceeded 98%, customer complaint rate is less than 0.6%. High quality products and excellent professional services have won unanimously recognized and praised by domestic and foreign customers ! We have always held a strange belief that is to build China’s high-quality bearings manufacturers and product solutions providers! Let the world fall in love with made in China!

Process flow

 

1. Forgings

1. Forgings
1. Field investigation, selection of high-quality suppliers, sampling and testing of their raw materials, and random sampling in follow-up cooperation, in order to ensure that raw materials meet national standards, mechanical properties meet product design requirements.
2. After the forgings enter the factory, the quality inspectors shall inspect the appearance and measure the size of the forgings to ensure that there are no obvious defects and sufficient margins for processing to the finished products.

2. Rough turning

2. Rough turning
1.Descaling rough turning, according to the size of finished products, reserve different size margins.
2. Ultrasound flaw detection, the forgings after rough turning are detected by ultrasound, whether there are any defects in the material, such as blowhole, slag inclusion, lamination and so on.
3. Quenching and tempering treatment, according to the national standard or the special requirements of customers,the forgings after rough turning are tempered to improve the mechanical properties as a whole..
4. Hardness Testing of Quenching and Tempering,Testing whether the overall hardness of forgings is qualified according to quenching and tempering hardness requirements.

3. Precision turning

3. Precision turning before quenching
Precision turning of raceway, reserving different dimension allowance according to different raceway structure type and size, Guarantee that machine-added deformation and quenching deformation can be eliminated, and at the same time, ensuring that the allowance is as small as possible.

4. Quenching and

4. Quenching and tempering stability of raceway
The raceway is quenched by medium frequency quenching process. The hardness of quenching area reaches HRC55-62, and the effective depth is not less than 3 mm. After quenching, the raceway is tempered stably to eliminate quenching stress, reduce subsequent processing deformation and reduce the risk of raceway cracking.

5. Detection of hardness

5. Detection of hardness
depth and crack
Detection of hardness, effective depth and crack in quenched area, especially initial position.

6. Quenched semi-finish turning

6. Quenched semi-finish turning
Processing datum level, providing datum for subsequent processing of teeth, holes, etc.

7. Tooth processing

7. Tooth processing
According to different kinds of tooth shape, processing methods such as shaping, hobbing and milling can be selected. The accuracy level can meet 7-10 grades. If higher accuracy is needed, grinding can meet 4-6 grades.

8. Hardening, Tempering Stability and Testing of Teeth

8. Hardening, Tempering Stability and Testing of Teeth
In order to meet the strength and service life of the teeth, high frequency quenching is carried out on the tooth surface, root and top according to different requirements. The hardness can meet HRC 40-55 and the depth can meet 1.5mm. Tempering stabilization after quenching ,the quenching stress can be eliminated, the cracking risk of the quenched part can be reduced, and the hardness and crack detection can be carried out after quenching.

9. Hole Processing and Detection

9. Hole Processing and Detection
Control the chord length, wall thickness, aperture and other items in the machining process and correct them in time. Inspection for threads with high accuracy requirements.

10.Fine grinding and testing

10.Fine grinding and testing
For high-precision products, precise grinding is used to effectively control the parameters of ring ellipse, wall thickness and flatness, so as to ensure that the precision of finished products meets the requirements of standards or customer drawings.

11. Match clearance

11. Match clearance
Accurate measurement of part size, Calculating spare parts allowance, according to the requirements of the drawings to match clearance

12. Assembling

12. Assembling
Remove ring burrs and clean up. Install corresponding size and number of rollers, cages, seals and other accessories in strict accordance with the requirements of assembly drawings. Rotate to detect whether the rotation is flexible and whether there is any abnormal noise.

13. Finished product testing

13. Finished product testing
The assembly is completed, then the various technical indicators are inspected and detailed records are made.

14. Installation of Sign Mark

14. Installation of Sign Mark
Install sign and logo according to customer requirement

15. Fill grease and Packaging

15. Fill greased and Packaging
1. Before product packaging, add corresponding brand and type grease according to customer’s requirements to protect raceway from damage.
2. Export wooden boxes suitable for sea transportation are used to ensure the safe arrival of goods at different transportation distances, storage times and regions.

Luoyang Hengguan Bearing Technology Co., Ltd.
One More Choice For You!
Luoyang Hengguan Bearing Technology Co., Ltd.
 Address:Room 1917, Block B, Yunfeng International, Jianxi District, Luoyang City, China.
  +8613663793011    
   lyhgzc@163.com
  +86-379-60697782  

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