The bed has more dynamic characteristics than the original grinding machine. It analyzes the influence of the rib layout of the main parts of the 120-person internal grinding machine on its dynamic characteristics, and compares the whole machine with the improved parts. The dynamic characteristics of the grinding machine and the original grinding machine.
The influence of the 1 type ribs on the dynamic performance of the parts. Among the main parts of the 2120 internal grinding machine, the bed bridge headboard slide and the grinding frame support slide can be regarded as similar parts, all of which are of the same order of magnitude. The physical structure. The original structural design has all been used to buckle the well-shaped ribs. The bridge plate is taken as an example to analyze the influence of the ribbed plate type on its dynamic performance. The first-order torsion frequency of the original bridge plate was analyzed to be 279.5. Now the well-type ribs of the original bridge plate are changed to the meaning type and the m-shaped type respectively, while the other structures remain unchanged, the finite element analysis results show that the first-order torsion frequency of the bridge plate is 324.631, which is better than the original bridge. The board is still 16.31; the first-order torsion frequency of the Mi-shaped bridge is 312.6312, which is 12.12 more than the original bridge.
3 well reinforced ribbed bridge plate 00, reinforced slab bridge plate, m-shaped medium rib plate bridge plate first-order vibration mode to explain the first-order vibration mode to explain the first-order vibration, the cabinet can be known from the above analysis, the structural ratio of the ribbed plate The structure with the well-shaped ribs has a higher torsion resistance. At the same time, it can be obtained by comparing the bridges of the m-shaped bridge and the ribs. Although the former has more than a set of torsion frequencies called root slabs like bridges, it not only does not improve but decreases by 12, which shows that according to the traditional empirical design method, blindly setting multiple ribs is not conducive to improving the dynamic stiffness of the structure itself.
The bed bed ç˜ skateboard and the grinding frame support slide are also improved in the same way, and the same conclusion as the bridge analysis can be obtained.
The influence of 2 well-shaped ribs on the dynamic performance of the parts is 12120. The internal grinding pedestal is a long-distance human-shaped cross-section ribbed slab. The analysis is based on the analysis. The first mode shape of Ding Zuotai is curved. The frequency is 91.25 out of 2; 1. The rice type ribs are now changed to a well type. While still maintaining other structures + changes, the first-order bending frequency is 126.8721, which is higher than the work table by 39.04. This is the structure of the Minin-type ribs and the use of the well-shaped ribs. Compared with the former, the bending resistance is not 5, 1., the m-shaped rib plate workbench 1 well-shaped rib plate table bending vibration mode = 91.251 bending vibration mode 3 grinder machine dynamic characteristics comparison usually, single part moving The rigidity can be compared by comparing the corresponding grinding machine to the machine. It is not so simple. It is often necessary to calculate the manufacturing technology of Jiangsu Province's nine major industrial projects. 980062e. Manufacturing technology, and machine tools> 2å’¿ 4th phase using electric motor for linear motors Performance gold push positive 0 and male Yamada Jiu Dianfeng Yonglong Shengsha Shike Co., Ltd., and the comparison with the rotary motor method test results show that the linear motor mode positioning control accuracy is high, the knife speed is fast, the effect is good, can be more Effectively prevent short circuits. Therefore, the processing speed and the processing efficiency can be improved. 1 Introduction The electric discharge machine is based on the processing form. When the chip removal effect is poor, when the processing chips are retained, abnormal discharge will occur, and the processing cannot be carried out. Therefore, it is well known that spray cleaning tools are used in production to stabilize processing. Some also achieve stable processing by controlling the discharge stop time using the processing conditions of the expansion gap. These methods sacrifice the processing speed. Therefore, in the exploration of the use of the near-ideal processing speed to increase the processing capacity of the human body, the continuous improvement of the machine tool driving method has emerged, and a linear motor capable of achieving high-speed, high-precision, high-response vibration has appeared, but the turning machine can utilize the ball wire. The bar speed reduction mechanism, while the linear motor is directly driven, requires high power, and the linear motor that can meet this condition is extremely expensive, and this alone hinders its practical application.
Therefore, the company developed its own linear motor and servo system based on the use of the machine tool. The processing performance of the 35 EDM machine using the linear motor and servo system on the 72-axis is described below.
2 sensitivity response 2.1 evaluation index of servo response feedback control system generation evaluation index has frequency response order energy determination. The actual working condition of the grinding machine The resonance of the finishing machine often occurs in the first step solid and near the frequency. Therefore, the whole machine is evaluated by the magnitude of the relative displacement of the grinding head and the workpiece in the corresponding frequency and the corresponding vibration mode. The pros and cons of dynamic features.
12120. Internal grinding machine before and after the improvement of the frequency and relative displacement 3 comparison of the first natural frequency 0 grinding head and the relative displacement of the workpiece, the prototype improved effect combines the improved parts of the above 2120 internal grinding machine, and Using the original grinding machine combined surface form and the grinding machine rotor system and the workpiece rotor system, the first natural frequency of the improved grinding machine and the relative displacement of the grinding head and the workpiece are calculated. The value is as high as 17.92 compared with the original grinding machine. The relative displacement to the workpiece is reduced by 10.37. This improves the dynamic performance of the grinding machine by improving the dynamic stiffness of each part.
4 Conclusion software, 1 pair of 12120. The main parts of the internal honing machine and the whole machine were analyzed dynamically, and the following conclusions were drawn. For the machine parts with the first mode shape being torsion, it is better to adopt the structure layout type of the rib plate. For the machine tool parts whose first mode is curved, it is better to adopt the structural arrangement of the well type ribs.
The setting of the ribs should have a theoretical basis. Blindly setting a plurality of ribs is not conducive to the improvement of the dynamic stiffness of the structure. Changing the layout of the ribs is an effective means to improve the dynamic performance of the whole machine.
1 Sun Qinghong. Zhang Si. Huo Shaocheng. The pulse excitation method is used in the research of machine tool modal analysis.
Proceedings of the First Annual Conference of China School Dynamics Research Association, 1985.
Guoqiang. Practical engineering numerical simulation technology and its practice in People's Appeal 8. Xi'an Northwestern Polytechnical University Press, 1999.
3 Xu Yanshen. Mechanical dynamic design. Beijing Machinery Industry Press, 1992, the third person Mao Haijun, Nanjing Archway No. 2, Southeast University, Department of Mechanical Engineering, doctoral letter box, zip code 296 editor Zhao Honglin received revised draft date 252, 芾 努 努 ç æ…° æ…° æ…° 通 通 通 通 努8, 8 Lu Lu like 6.6 home to pull 8 generations 866. 0.,
(Finish)
Alloy material:Boron nitride is an excellent tool material for processing iron metal and alloy, and boron nitride (PCBN) is a polycrystalline composite substrate with alloy substrate at the bottom.
PCD PCBN MCD cutting tool
GanSu Port Logistics Co.,Ltd , http://www.gskouan.com