Research On Hitting Energy Of 50KJ Hydraulic Forging Hammer

Modern industry has been developing rapidly, especially in cars, agrimotors, projects, mining and so on, they need more and more calcinators which have high precision and high quality. The forging hammer is an important device which is used to forge roughcast in machine shops. This device had played and is playing an important role in forging industry, and is a press device which is generous and indispensability in machine building. The forging hammers, especially the air-steam hammer, are in the enormous proportion, and still play a very important role in various economic departments of many countries at the present time.Hydraulic forging hammer is drived by pure hydraulic pressure or by hydraulic and air pressure. It has some advantages, for example saving metallic material, saving energy sources, having less vibration and so on.The model CJ83-50KJ hydraulic forging hammer is only designed by our country which designed by Roll Forging Research Institute of Jilin University. The working cylinder is rushed 0.6Mpa compress air when it is working, the tup is peaded by the backhaul cylinder, at the same time. The frame is moved up by supporting cylinder through the system of draw bar-lever, then attacking movement come ture. It has some advantages, for example having the lighter hammer, saving metallic material, saving energy sources, having less request for base and so on. This device will develop faster in domestic. But air-steam hammer exist the very big problem, not only the valid utilization of the energy is low, but also is vibration big, the noise is big. For the sake of the environmental protection, the factory house must to increase the factory's investment for damping. Further more, the air-steam hammer need the huge foundation for damping, install the expenses equipment thus also by all means and more high. Because the air-steam hammer need steam power, so while use need the motive equipments, increased thus and equally to the investment of the equipments, still wasted the manpower.Hydraulic forging hammer conquers these defects, becoming to the next generation hammer. But there are some problems during long period producing practice. Most are high malfunction rate, less reliability, the main reason is that the hitting energy can't be controlled, when the energy which is absorbed by distortion of workpiece is less than the hitting energy, the extra energy lead to the hitting between up-hammer and down-hammer, which brings vibration of hammer, that makes the joining piece become flexible, and easy bring fatigue crack. Therefore achieving the autocontrol of the hitting energy, avoiding the extra energy, can enhance the reliability of hydraulic forging hammer, minish noise, prolong die life, make performance and price rate exceed import hammer, possessing great economic benefit and social benefit.This paper achieves the following works according to the research on research on hitting energy of 50KJ hydraulic forging hammer.1. This paper introduce the basic characteristics of die hammer, general development situation and trend inside and outside, offer the source of this task, the main work of this paper.2. This paper introduces the working theory and the structural characteristic of the CJ83-50KJ hydraulic die forging hammer.3. This paper constructs math model and simulating model of hitting energy through the mensurable and unmensurable analysis of factor which affect hitting energy of hydraulic forging hammer, achieves the simulation of the relation between hitting distance and hitting energy under the situation of different air press and different installing die highness, this paper got the conclusion that the beginning air press, hitting distance, installing die highness are the main factor which affect the hitting energy. Once the beginning air press and installing die highness are certain, hitting distance determines the hitting energy.4. This paper proves that math model and simulating model of hitting energy are reliable through the compare between calculating value and measuring value of hydraulic die forging hammer's hitting energy, which can offer reliable theory for autocontrol of hitting energy.5. This paper constructs hitting efficiency mathematical model for the hydraulic forging hammer through reasonable analysis of hydraulic forging hammer's hitting energy.6. This paper proves the hitting efficiency mathematical model is correct and reliable though the compare between calculating value and measuring value of hydraulic die forging hammer's hitting energy efficiency, provides the credible theory for choosing hitting energy before autocontrol of hitting energy.