Coil Spring (compression) Length 905mm*Diameter 117mm

Technical requirements: The material is 55Cr-Si alloy steel (Germany corresponding material 080A52), the number of effective windings is 28N, the end well is combined with the spring axis, and the burr is removed.?The spring needs to work freely in a 128mm diameter hole during loading and unloading.?The test was compressed to 303mm with a load of 1000KG for 3 days and a tolerance range of 900mm+3mm for the total length.?Diameter 117mm+-1.5mm, inside diameter 73mm+-0.5mm, spring alloy steel size :22*11mm+-0.3mm?

Technical Explanation:

1. The working environment of this spring is high temperature, high force and high frequency of the turret buffer spring, the technical difficulty requirements are high, the high material standard is rare in the industry.?After three years of production design and continuous testing of the spring and the final completion of the order, I finally completed the work perfectly in cooperation with the technical department, sales department and customers.

2. Material: 55Cr-Si hard alloy steel, the testing requirements of the material, the hardness test must be in the range of 400~450VPN surface hardness value, after polishing with sandpaper, in the grinding machine at ordinary times (must use coolant or water cooling) or high-speed grinding will produce high temperature, sample will affect the test data.?This is crucial.?The accuracy of the data is in the details.?The hardness value of this qualified sample submitted for inspection is 500~520VPN.

About the composition analysis report of the material, need to use a special material analysis instrument to detect, 55Cr-Si hard alloy steel, A5 section layer is required to 0%, D1 raw material without heat treatment hardness test value of 265, ED1 grain size of 8, J1A sulfide 0.5, J2B alumina 0.5.

3.?Quenching heat treatment of spring.?The professional heat treatment engineer of a comprehensive understanding of materials and technological parameters of the spring, spring will quenching at temperature of 400 ~ 480 degrees Celsius airtight container for the oil set a time for 30 minutes for quenching for the first time, the spring must be out of the container,natural cooling in the normal temperature, the time normally need 10 hours, because the spring after the heat bilges cold shrink, The size and value have been accepted by the instrument.?If the value is not up to the standard, it will be secondary quenching.?In this process, the spring must be fully immersed in oil.?Otherwise, it will affect the hardness and service life of the spring.?

4.?The surface phosphating treatment (rust) this process is relatively simple, it is at the end of the spring in the process to complete it, it is also a kind of European and American markets for hardware products now commonly used technology, the technology of environmental protection, make the surface of the steel reduction,?and attach a layer of protective film on the surface.Antirust effect under the seal of paper package can be stored for a long time.?

5.?To sum up, the manufacturing process of ultra-high standard spring is very complex.?A qualified spring product embodies the practical experience of many excellent engineers and the data analysis and comparison of theoretical engineers.?Each spring is unique.?This article is many years of personal experience and full participation in it, if there are deficiencies, please forgive me.?Technology is endless, hope to share with more customers and professionals.?