Dissertation > Excellent graduate degree dissertation topics show

Research on Screw Joint for Precise Assembly of Miniature Parts

Author: SongSha
Tutor: WangXiaoDong
School: Dalian University of Technology
Course: Precision instruments and machinery
Keywords: Precision thread Vice assembly Torque / time control Precision assembly devices The micro small parts assembly
CLC: TH131.3
Type: Master's thesis
Year: 2009
Downloads: 111
Quote: 1
Read: Download Dissertation

Abstract


Threaded connection as the most widely used connection mode , the quality of which is coupled directly affect the quality and reliability of the product assembly . With the miniaturization of mechanical and electrical products , precision development , micro threaded connection control requirements are also increasing. To improve the fatigue life and reliability of the thread joint , improve the quality of the threaded connection , the key is the reasonable control of preload size . The most commonly used , tighten the screw method is the torque control method, which easily lead to thread Vice axial preload dispersed connection reliability is not high . Other commonly used control methods need to be threaded Vice screwed to the yield, does not apply to the target preload determined thread Vice micro and small parts precision assembly . This paper presents the torque / time control method , not add angle sensors and other equipment , only from an improved method of controlling the angle and improve the accuracy of the preload control . This thesis focuses on micro and small parts precision assembly thread Deputy connection technology , including : ① the research thread Vice initial screwing state and determine screw pairs can successfully assembled the maximum allowed position deviation and angle deviation ; ( 2 ) is proposed new tightening control method - torque / time control method, based on the relationship between the bolt elastically deformed within the range of pretension force and torque , the nut rotation angle , torque constant speed under the relationship of the slope of the change with time as well as the stiffness of the system , for each pair thread vice tightening torque is applied to reduce friction uncertainties in the assembly process , to improve the consistency of preload , and by the finite element simulation and dynamic simulation with disc spring washer M1.4 thread vice tighten the nut assembly process ; ( 3 ) developed a set of thread Vice automatic assembling apparatus , including the screw mandrel module and rail movement module . Screwed tight shaft module core of the entire assembly device , including a power source torque sensor selection and tighten the design of the tight clamping device ; ④ respectively using torque control method and torque / time control method for the comparative experiments , and through the force sensor for the core of the preload detection means detects preload dispersion of the two methods . The experiments show that the torque / time control method effectively improve the the preload control accuracy , which can improve the quality of product assembly .

Related Dissertations

  1. Research on Machine Vision Based Precise Assembly for Miniature Parts,TP391.7
  2. Optimal Design and Simulation Research of Subsea Flange Connection Tool,TH131
  3. Research on Key Technology of Experimental Prototype of New Underwater Flange Connecting Tool,TH131
  4. Research of the Design and Process Technology of the Variable Pitch Screw,TH131.3
  5. The Analysis of Bolt Flange 3-d Finite Element and Tightness,TH131
  6. Study on Automatic Adjustment Device for Fixed Torque Bolt,TH131.3
  7. Research on Wedge-Ring Connection Structure Reliability-Based Design Optimization,TH131.5
  8. Kinetic analysis of self-piercing rivet head,TH131.1
  9. Dynamic Analysis and Fatigue Analysis of SPR Joints,TH131.1
  10. Mechanical Properties of Single Lap-jointed Clinched Joints,TH131
  11. Magazines’ Structure Design of Deepwater Bolted Pipe Flange Connecting Tool and Research on Its Control System,TH131.3
  12. Properties Analysis of the Composites Liminates Bolted Joints,TH131.3
  13. The Research on Technology of Mechanical Expand Connection,TH131
  14. New bolts Test System Design,TH131.3
  15. Coupling structure complex nonlinear finite element method for accurate modeling and model validation study,TH131.3
  16. Measure and Influence Factors of Friction Coefficient of 42CrMo High Strength Bolts,TH131.3
  17. Study on Component System State-space Model Synthesis Method,TH131
  18. Analysis Based on the Elastic Contact of Bolted Structure of Frame,TH131.3
  19. Buttress thread casing joint performance simulation,TH131.3
  20. Research on Analysis of Shrink Disc Coupling Stresses,TH131.7
  21. Finite element analysis and design optimization of the cantilever hook buckle assembly,TH131

CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical parts and gear > Connection and connection parts > Thread connection
© 2012 www.DissertationTopic.Net  Mobile