Công việc vát mép "cổng xi lanh 2 thì" được thực hiện trong quá trình doa

When machining port chamfering on a 2-stroke cylinder, be careful to hold the cylinder firmly in place before working on it, or you may scratch or otherwise damage the cylinder's inner walls.

The inner wall of a 2-stroke cylinder that has been bored to accommodate oversized pistons. This is how it looks immediately after boring. The internal combustion equipment maker chamfers each port before moving on to the honing process.

The workbench dedicated to port processing looks like this. It is gate-shaped and features a vertical cut pipe welded face down. Cloth duct tape is applied to the R surface of this half-pipe to prevent scratching the cylinder's inner wall.

There was an air duct right next to the workbench that efficiently sucked up the scattered cutting dust and collected it in a dust collector. Desk lights were placed in front of and facing each other to illuminate the work, allowing the port shape to be clearly seen.

Cutters and wheel bars are set on the pneumatic port grinder used during chamfering operations. The top one is a spherical super steel bar for cast iron cylinders and the front one is a rubber wheel bar for plated cylinders. Both are commercially available.

After chamfering the edges of the intake, exhaust, and scavenging ports of the cylinder with a port grinder, be sure to chamfer the piston skirt area as well. This is even more necessary for new pistons. Instead of chamfering the piston skirt, be sure to lightly rub the skirt edge with waterproof paper No. 600 or so.

The 500H1 and 750H2 engines in the Kawasaki Mach series have particularly large intake and exhaust ports, which allow the pistons to pivot during reciprocating motion, causing each edge of the piston to collide with the port edge. This causes the inner walls of the cylinders and the top and bottom of the ports to reduce easily. Typical examples are the Kawasaki H1/H2, Yamaha 250DT1, Kawasaki 250TR Bison, and 350TR Bighorn.