Superfinish Stone
Super Finish Stones are generally called Super Grinding Wheels or SF Grinding Wheels because of their processing method and purpose, and are divided into two types: one is used by rotating the wheel and the other is used by vibrating the wheel.
As the name suggests, super-finishing wheels are designed for final finishing, mirror-finishing, and precision polishing. This method of surface finishing is performed by pouring grinding fluid.
Product Details
▼ Applications of Superfinishing Stones
- ① The outer circumference of rollers incorporated into cylindrical roller bearings
- ② The sliding surfaces in contact with the rollers on the outer and inner rings of bearings
③ The outer circumference of engine camshafts
▼ Advantages and Disadvantages of Superfinishing
◎ Advantages
- ① The through-feed type superfinishing machine allows precision grinding by simply passing the workpiece through grinding stones of different grit sizes arranged for roughing, intermediate, and final finishing, enabling mass production of precision components.
- ② Due to the vibration and rotational motion, the alteration layer on the surface of the workpiece is minimal.
◎ Disadvantages
- ① Since the material removal rate is low, high accuracy is required in the preceding process.
- ② Even minor changes in the grinding stone can significantly affect the workpiece, making it challenging to select a new grinding stone.
▼ Selection of Superfinishing Stones
- ① Abrasives: Select abrasives according to the workpiece material, following the same criteria as for grinding stones.
- ② Grit Size: Generally, #600 to #4000 are used. Depending on the bonding, treatment, and processing conditions, a surface roughness of approximately 1/10 to 1/15 of the abrasive particle size can be achieved.
- ③ Bonding: Generally, bonds softer than G are used. These stones are very soft.
- ④ Treatment: Sulfur treatment is commonly used to enhance stone strength and improve surface roughness precision. For cases where sulfur cannot be used, wax-treated stones are also available.
In recent years, the precision of mechanical structures has advanced significantly. Even bearings now require high rigidity and no play. These precision bearings are mounted on precisely ground shafts to create high-performance machines. These machines, in turn, produce precise components and high-accuracy products.
The advancements enabling this level of precision can be attributed to the effects of precision grinding using superfinishing stones.