Bolt connection methods are widely used, as people continue to improve product assembly requirements for the assembly of the key parts of the bolt preload group also put forward strict requirements and testing requirements. This paper introduces a common axis dynamometer, measuring device can be realized using a dedicated group of bolt preload measurement method and the engine fuel injector plate bolt preload measurement group assembled on the application.

Threaded fastener connection application

Threaded fastener assembly connection means has a simple structure, low cost, less demanding on the assembly tool, easy installation and removal, easy maintenance or replacement, etc., so the machinery and auto industries have been very widely used. For example, only in an ordinary car around on the need to assemble thousands of threaded fasteners.

Threaded fastener assembly joined in the application, the bolts (screws) applications accounted for the majority, and the addition of bolts to connect the application of group means. These bolts are small, but its role is quite a lot, if its failure will often cause the entire mechanisms not working, serious and even lead to plane crash consequences. This is why many car companies because of a small screw and the quality of the reasons for the recall of all models.

Bolt group assembly preload measurement needs

with the community's increasing demands for product quality, in many product design and assembly of connection, the connection of the key parts of the bolt group assembly torque, assembly and other preload assembly quality requirements are also increasing. Such as the latest development to meet the country Ⅲ emission standard diesel injector pressure plate bolt group assembly design, assembly of the bolt preload group proposed to strict requirements, but also raise preload on the bolt group assembly for measurement needs.

R & D to develop new products to the bolt group assembly process and verify the bolt group assembly process is reasonable or not, many users put forward the need for bolt group assembly preload measurement requirements, but not limited to specific devices and methods of measurement, the current there is no way the bolt group assembly preload measurement