The concept and significance of the tool's ice-cooling process

It is well known that the cold treatment process for tools involves lowering the martensite transformation end temperature below 0°C. After quenching, the microstructure contains a significant amount of retained austenite. To convert this retained austenite into martensite, the quenched workpiece is cooled further in a cold medium or chiller. This step ensures a more stable and hardened structure, enhancing the tool's performance and durability. The appropriate cold treatment temperature depends on the steel's chemical composition, specifically its Mf point (martensite transformation end temperature). For most steels, a mixture of dry ice and alcohol at -78°C is sufficient. It is crucial to perform the cold treatment immediately after quenching to prevent the retained austenite from stabilizing over time, which could reduce the effectiveness of the process. Complex-shaped parts may require pre-tempering to avoid cracking during cooling. In cases where dimensional stability is critical—such as with thread gauges—it’s common to perform two cold treatments. After cold treatment, the workpiece must be tempered or aged to relieve internal stresses and stabilize the newly formed martensite. During the cold treatment, the workpiece does not need to be kept warm; it only needs to reach the temperature of the cooling medium, typically within 1 to 2 hours. Once completed, the part is removed and slowly brought back to room temperature in the air before tempering. The typical cold treatment temperature ranges between -70°C and -80°C, depending on the steel's MS (martensite start temperature) and Mf values, as well as the specific requirements of the part. It's important to note that lower temperatures are not always better—only what is necessary to meet the technical specifications. Low carbon alloy carburized steels usually undergo treatment in the range of -70°C to -80°C. The cold treatment process adds significant value to the final product. Tools and precision instruments that go through this process often outperform those that don't. For instance, air turbo refrigerators operate based on compressed air expansion and refrigeration. They offer several advantages: fast cooling, quick temperature reach, environmentally friendly operation using compressed air, a wide operating temperature range without frost formation, and modular design for easy upgrades. Plus, they are user-friendly and require minimal maintenance. The cold treatment process for tools is carefully designed according to the steel's chemical composition. These advanced techniques are widely used in tools, measuring instruments, and precision equipment, significantly improving both product quality and operational efficiency.

Ungrouped

Tungsten End Mills For Sale,Endmills For Steel For Sale,Tungsten Milling Cutter

JIANGYIN GOLD STAR INDUSTRY CO.,LTD , https://www.jygoldstarindustry.com