Lock tongue and lock seat of locking mechanism of van and manufacturing method of lock tongue and lock seat

The invention provides a spring bolt and a lock seat of a locking mechanism of a van and a manufacturing method of the spring bolt and the lock seat, the spring bolt is provided with a ball socket and a ball, the lock seat is provided with a groove arc raceway, the contact part of the lock seat and the spring bolt is changed into the groove arc raceway from an existing convex slide way, the diameter of the groove arc raceway is larger than that of the ball, and the ball socket and the lock seat are arranged in the groove arc raceway. And the groove arc raceways are used as raceways of the balls. A ball is arranged at the contact part of a lock tongue and a lock seat, so that the lock tongue is difficult to manufacture, and the lock tongue can be manufactured by drilling and grinding and adopting an existing precision casting process and a manufacturing method for stamping a curled spherical surface, and the simple and ingenious method is as follows: when the precisely cast lock head is assembled with the ball