Research On Gripping Technologies And Assembly Force For Key Parts Of ICF

The assembly of micro parts is a hot spot in micro machinery manufacturingtechnology research field. Its technical level directly affects the progress of research onweapon system miniaturization. This paper aims at the key structure assembly of inertialconfinement fusion (ICF). This article examined the clamp technologies, on the basis ofcoaxial alignment of micro assembly technology proposed by research group. For therealization of nondestructive assembly, the mathematical relationship between axisdeflection and assembly force was analysed and calculated, providing technical support forhigh precision alignment assembly. The paper’s main research work is as follows:1．Considering ICF’s need, the paper analyzes the research situation at home and abroadabout the micro assembly system and the micro gripper system oriented middle scale.Finally, the micro assembly system test platform and precision clamping system weredetermined, and the main studied content of flexible clamp technologies was discussed.2．The quick change flexible clamping system for key components of ICF wasresearched and designed. According to the assembly targets’ characteristics and assemblyaccuracy index and assembly process indexes, the process planning was made. To reducethe cumulative error in a series of parts set ups which affecting assembling accuracy, thecollet chuck quick change and flexible gripper was designed. Assembly targets areclassified to9types of ones: the ultra-thin wall and deep sleeve parts, ultra-thin wall planeparts, and so on. Specialized grippers for these parts were designed and validated from atheoretical perspective.3. The performance of two typical flexible grippers for ICF was reaserched. For theair-filled flexible gripper and microsphere microgripper, the finite element simulationanalysis and experiment were conducted to validate the clamping capability.4. The technologies of virtual inspection in the microassembly process was researched, themathematical model between contact status and assembly force was established. Theanalysis of contact status and assembly force in the process of assembly was carried outcomprehensively, which included the analysis of the contact status of the target and baseparts in the process of assembly, the analysis of stress state, the establish of the mathematical model of the shaft hole assembly. Simulations by MATLAB and the variationtrend of assembly force along with the change of the depth of the assembly. On this basis,the allowed maximum assembly deviation during the assembly of the target component iscalculated through FEM, taking the target component as example，providing theoreticalguidance and technical support for assembly.5. The assembly platform was constructed based on coaxial alignment principle. Amathematical model of the contact assembly force and assembly deviation was established，which verified the validity and feasibility of the theory and simulation results. Firstly,different lateral deviation and angular deviation were applied. Then the model of thecontact assembly force and angular deviation and transverse displacement deviation wasestablished, and then the assembly force threshold was obtained, verifying the validity andfeasibility of the theory and simulation. What’s more, on the premise of not damaging parts，the allowed lateral deviation and angular deviation were analyzed，which can be used toguide the ICF assembly, providing theoretical guidance and technical support for precisionmicro devices assembly.