Research On Rotary Forging Process Of Lathe Spindle By CAE

A machine tool is the machine for making machines. Since the industrial revolution, it is an important tool for human production and manufacture. The machine plays a strategic role in the economy and the modernization of national defense, and it is the embodiment of the comprehensive national strength basic industry. The machining accuracy of machine tool reflects the production level of society. The lathe is a general, wide coverage, high efficiency and high precision machine tool in mechanical processing and manufacturing, which plays an important role in. Lathe spindle lathe fixture and workpiece is driven high speed rotating shaft, work not only have to bear the torque, but also bear the bending moment. The lathe spindle quality directly affects the machining accuracy and the service life of the whole machine, so it is one of the key parts of the lathe.The traditional lathe spindle blank forging process is to use the rod part stretching method. The process for the use of solid free forging billet with larger diameter, the pulling process, retaining flange diameter, stretching a stepped shaft, and then through the deep hole drilling or cutting out deep hole trepanning, satisfy the requirements of forging stock for subsequent processing. This traditional craft is simple, but there are large volume, heating energy consumption shortcomings, and deep processing difficulty, low material utilization ratio, the production efficiency is low.For the optimization of the lathe spindle forging process, this paper first proposed that using local forging method to forming of the spindle flange:used saw cutting thick wall seamless steel pipe for the initial blank---gathering the end part of the materials by multi hydraulic press ---hot rotary forging the flange. Based on the metal forming process of the shaping of theoretical analysis and finite element numerical simulation, get the following conclusions:1. Optimize the shape of aggregate blank, design it as a cone, and it can avoid the mushroom effect in the rotary process. It is more advantageous to metal forming, and reduce the generation of the flying edge;2. With a closed rotary forging die mandrel head form, and optimized rotary forging parameters. On the basis of a variable speed feed, a multiple variable speed feed mode is proposed, in order to get closer to the real case of the rolling simulation results. Then selection of 260t horizontal rotary forging machine;3. Through the analysis of the metal flow defect of the right angle stepped head, the structure of the conical angle step head is designed. The results show that the step angle of the cone angle can avoid the metal flow defect, save the material and the economy is better;4. By comparison and analysis, empty rotary finishing can straighten the flange, and make the thickness of the material evenly. After the measurement, the forging flange is well formed after multiple variable speed rotary forging, and the dimensions accord with request.Based on the quantitative economic benefit calculation for the rotary forging process, taking a machine tool enterprise as an example, we found that the new process can save 1.92 million yuan per year than the traditional process. The results preliminary show that rotary forging process can reduce the forming force, improve the microstructure and properties of products, reduce labor intensity, with economic feasibility. Lathe spindle rotary forging process provides a considerable economic benefit of the main forming method and the corresponding theoretical basis for manufacturers.