The 2022 Beijing Winter Olympics is being carried on. Curling is also a high-profile sport at the Winter Olympics. What is curling made of ? What is the process like? Here's how curling is made.

Curling is made of a special mica-free granite from Scotland. It has to go through more than 20 processes from mining to cutting to shaping, grinding, polishing, painting and bonding, among which the shaping and grinding of curling is an important part.

After the granite is collected, a special diamond rope saw should be used to cut it so as not to damage the performance of the granite. The model is then used to mark the size of the stone and where it needs to be cut, followed by a cutter to cut the shape of the stone. High-intensity suction is then used to transfer the slab out, and a drill is used to punch a small hole in the centre of the slab, into which the handle is fitted.

Next, replace the upper grinding head for the machine, and grind one side of the stone ring into an arc. After this side is completed, the worker needs to turn over, and the other side is also polished into an arc. After the initial polishing and molding, the surface of curling is still very rough. At this time, the worker needs to use grinding wheels and grinding pieces to polish it for many times.

Finally, according to the shape of curling, the worker needs to carry out detailed sandblasting grinding and manual adjustment. In addition, the top and bottom of the curling stone will be sculpted into a concave shape. After that, hit the sides of the curling stone with glass beads. This is to prevent the stones from cracking on impact, and the worker then sand the top and bottom of the stone with coarse sandpaper to give it more friction.