System for Real-time Measurement and Monitoring of Forging Force of Screw-forming Machine

Abstract

Screws are commonly used fasteners. In general, the term "fastener" refers to machine components comprising screws and bolts used to affix two or more components together. Screw production consists of three steps, namely, heading, threading, and coating. During the forming process, the mold used may be damaged as a result of defects in the metal wire or metal bar. In this study, we employed the CBF-43S screw-forming machine developed by Chun Zu Machinery Industry as the monitoring target and performed kinetic analysis on the slider-crank mechanism of the machine using the provided parameters. Subsequently, the forging force of the machine was measured by a force sensor and its real time changes were recorded. When an error value was identified, the machine was immediately shut down and the mold was inspected for damage. Through this method, the detrimental effect of damaged molds on the quality of screws and bolts can be prevented.

Condition Monitoring to Enable Predictive Maintenance on a Six-Die Nut Manufacturing Machine through Force Data Analysis

“…To facilitate this, an optical measuring instrument and vector decomposition-for dimensional accuracy-along with other parameters, were input into a system which allowed the mould case to adjust its position to create better quality products. Most recently, Cheng [14] developed a real-time monitoring system which measured the forging force of a screw-forming machine and established upper and lower limits of the mean forging force of the first three moulds. When the limits were exceeded, the machine would halt manufacturing.…”

Fastener Product Cold Heading Process Formulation and Precision Die Design

“…Compared with hot forging and warm forging, it can save material by 30% to 50%, save energy by 40% to 80%, and can improve the quality of forgings and the working environment. With the development of refined production of small and medium-sized fasteners and the popularization and application of cold extrusion and warm extrusion processes, multi-station cold heading presses, precision presses and special opportunities for design and manufacture of certain forgings have been vigorously developed [6][7][8]. (a).…”