Research And Design On Automatic Assembling Bolts System For Fracture Splitting Connecting Rods

The fracture splitting technology of connecting rod for vehicle engines is the most advanced technology for processing connecting rod, which appeared and was developed in the beginning of the 1990s. Compared with conventional processing method of connecting rod the fracture splitting technology is significant reform. This new technology is so ingenious in design, simple, convenient and easy to control in technology, efficient and low cost that it has become one of the important signs of the level of manufacturing industry of engine connecting rod. So many abroad large-scale automobile production companies as well as tool and equipment production companies have done plentiful research works in the fracture splitting technical field of connecting rods. The fracture splitting technology of connecting rod has become mature day by day. So far, the absolute majority of the domestic corporations of the connecting rods have continued to use the traditional connecting rods processing method which has so many shortcomings as low efficiency, complex technology processes, high cost and waste and so on. This has become the bottleneck of the development of the connecting rod industry and even the engine industry. The research team leaded by Professor Yang Shenhua of Jilin University is doing a lot of research on the fracture splitting technology of connecting rod for vehicle engines in order to carry out this new technology and apply it extensively at home. And China "863"Program "Engine connecting rod fracture manufacture technology and equipment"has been passed the application. The key items of the fracture splitting technology of connecting rod are automatic production of three core working procedure. They are machining of cracking notches, directed fracture separating and assembling bolts in required torque. Contents needed to be researched in this thesis are automatic assembling bolts system for fracture splitting connecting rods. Being one of the key techniques of the fracture splitting technology of connecting rod, assembling bolts is very important to the quality of fracture splitting connecting rod. During the fracture separating procedure, fracture splitting and restoration has been finished. But the bolts have not been inserted. During the assembling bolts procedure, the first step is that the bolts must be fed automatically by the hopper. The bolts for jointing the head and the end of connecting rod together are fed to fixture of connecting rod for inserting bolts by the hopper and feeding track. Secondly the equipment for inserting bolts pushes the bolts into the bolt hole of connecting rod automatically. Then the connecting rods which have bolts are carried from working position of inserting bolts to assembling bolts. At last bolts are tightened in required torque by stable torque wrench. The chief technical difficulty is how to position and clamp connecting rod whose head and end has already been restored in high precision. During the process of positioning and clamped, the connecting rod must be clamped firmly. Its head and end must keep meshing and can be loosened and moved wrongly. This question how to assure it is one of the key technical difficulties of fracture splitting connecting rod.Furthermore, the equipment of feeding bolts must be chose properly in order to bolts whose direction and position is wrong can be distinguished and winkled out. The equipment of inserting bolts must insert two bolts into the bolt hole of connecting rod simultaneously and accurately. The course is so complex and difficult that the fault ratio in this part of automatic product line is rather high. Now only a few corporations have imported the automatic product line of fracture splitting connecting rod. The fault ratio in the course of feeding and inserting bolts has influenced the automated production more or less. In order to solve above-mentioned difficulties, this thesis has research and design on automatic assembling bolts system for fracture splitting connecting rods. The thesis include three parts that are automatic feeding bolts system, the equipment of inserting bolts and assembly system of stable torque wrench fastening. The main contents of the thesis are as follows: 1. Based on deeply studying the structural character and function of all parts of feeding system, automatic feeding bolts system that can apply to some kinds of connecting rod has been designed. It can meet with the desire of massive production. This feeding system has been jointed properly with the equipment of inserting bolts in order that bolts can be inserted into the bolt hole automatically and exactly. 2. In the thesis fixture of fracture splitting connecting rods for positioning and clamping is designed. It is one of key technologic equipments of fracture splitting connecting rods. It has a particular mechanism which can rotate for a certain angle as it moves up and down. The mechanism can assure that connecting rods are clamped firmly when bolts are tightened. During this course the head and end of connecting rod have not any offset and loose. It can prevent from falling scrap iron...