(1) Abrasion on the inner surface of the ear hole (mechanical injury). There's abrasions where the earhole meets the straight part of the reed.

(2) the diameter of the coil ear is out of line, out of circle, and "horn mouth" :

(3) Strong bending in the flat section of the rolling ear:

(4) Ear width size is easy to appear out of whack.

What are the causes of mechanical chafing when reed ears are rolled?

(1) When rolling the ear hole is not round, a part of the ear hole is smaller than the diameter of the shaft, and when the shaft enters the ear hole, it is forced to open the reed roll ear, and the mandrel is bruised

Inner surface of ear hole.

(2) The motion sequence of the shaping front die and the spindle is not well matched. When the shaping front die is finished, the mandrel enters the ear hole again, and the inner hole must be rubbed

Wipe.

(3) There are oxide skin residues in the inner hole of the roll ear or oxide skin sticking on the spindle and other reasons.

What is rolling ear purpose?

The main purpose of the lug is to protect the end of the first piece, and once the lug is broken, the lug is used to ensure that the leaf spring does not detach

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