The machine equipment and articles used in the self forging of core pulling rivets are of great practicability. The special grinding tools for lifting goods at the engineering cost are not needed. The metal materials are deformed in the middle of the iron between the upper and lower parts, and are not subject to the tube bundle of abrasives. The appearance and limit of steel castings are guaranteed by the professional skills of the forging workers, which can forge steel castings from ten grams to several hundred tons.

However, the self satisfied forging of core pulling rivets requires high level of professional skills of forging workers, the limit precision of steel castings is low, the surplus processing of all aluminum lantern rivets is large, and the consumption of Jinpu is more, and the production efficiency is low, the standard deviation of workers and the compressive strength are large. Therefore, it is effective to use self forging if the formelan rivet is manufactured in bulk and small batch.

In addition, for the same steel casting, the tonnage of machinery and equipment required for the self forging of formela rivet is much smaller than that for free forging. Therefore, it is basically the only forging method for large and medium-sized steel castings, which has a very important part in the manufacturing of super heavy equipment.

The basic principle, instrument and equipment, test piece and accurate measurement of the resistor of the core pulling rivet

1. Theme and application field

This standard describes the resistance measurement method of cables for bolt circuit breakers. This specification is applicable to all kinds of cables for bolt circuit breakers manufactured by various methods at the price of profiled rivets, as well as cables for other circuit breakers

2. Basic principles

The basic concept of accurate resistance measurement is the basic principle of DC double arm bridge