Assembly position precision analysis method considering geometric tolerance and deformation influence

A technology of assembly position and accuracy analysis, applied in instruments, calculations, electrical and digital data processing, etc., can solve the problems of simulating the size distribution of closed loops, not conforming to parts processing conditions, unreliable analysis results, etc., to achieve accurate analysis results and simulation results. Intuitive results

Pending Publication Date: 2019-09-24
NANJING UNIV OF SCI & TECH
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Problems solved by technology

The Chinese patent "A UG-Based Plane Dimension Chain Calculation Method" (Application No.: 201611036791.9) proposes a UG-based planar dimension chain calculation method, which utilizes the planar dimension chain diagram and the dimension-driven function of the UG sketch to perform the calculation of each component ring. The increase and decrease loop analysis uses the extreme value method to calculate the tolerance range of the closed loop; the component lo

Method used

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  • Assembly position precision analysis method considering geometric tolerance and deformation influence
  • Assembly position precision analysis method considering geometric tolerance and deformation influence
  • Assembly position precision analysis method considering geometric tolerance and deformation influence

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Embodiment

[0060] Taking the crankshaft transmission part of a high-speed warp knitting machine as an example, the implementation flow chart is as follows figure 1 As shown, the specific steps are as follows:

[0061] Step 1. Determine the closed loop of the parts to be analyzed, and construct the assembly dimension chain model according to the assembly relationship;

[0062] See attached figure 2 And attached image 3 , the crankshaft transmission part of the high-speed warp knitting machine is assembled from four parts: oil tank 1, connecting rod frame 2, bearing bush 3 and crankshaft 4; Above, the crankshaft 4 is installed on the connecting rod frame 2, and the bearing bush 3 is sleeved between the connecting rod frame 2 and the crankshaft 4. In the crankshaft transmission components, the assembly position of the crankshaft axis relative to the oil tank is the assembly function requirement. The assembly position of the crankshaft axis relative to the oil tank can be divided into t...

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Abstract

The invention discloses an assembly position precision analysis method considering geometric tolerance and deformation influence. The method comprises the following steps: determining a closed ring of a to-be-analyzed part, and constructing an assembly dimension chain model according to an assembly relationship; according to the assembly dimension chain model, setting the dimension tolerance and the geometric tolerance of each part forming ring of the to-be-analyzed part; simulating part deformation under the action of gravity by a finite element method, and extracting discrete node coordinate values of key characteristics of the deformed part; fitting discrete node coordinate values by adopting a least square method, and obtaining the deformation amount of a ring formed by the deformed part; according to the deformation of the deformed part forming ring, modifying the basic size value of the part forming ring; simulating the size distribution and tolerance range of the closed ring by adopting a Monte Carlo random sampling method; and detecting whether the closed ring meets the crankshaft assembly position precision requirement or not. According to the method, whether the tolerance of each currently arranged part forming ring can meet the assembly position precision can be analyzed.

Description

technical field [0001] The invention belongs to the field of mechanical assembly precision design, in particular to an analysis method of assembly position precision considering the influence of geometric tolerance and deformation. Background technique [0002] Assembly accuracy is an extremely important quality characteristic of mechanical products. Good working performance of mechanical products must be guaranteed by qualified assembly accuracy. Especially for high-speed precision mechanical equipment, small assembly position deviations will bring eccentric force and vibration of the whole machine. , Abnormal noise and other problems, and even cause fatigue fracture of some parts. In the actual mechanical product design and manufacturing process, designers mainly rely on past design experience and design manuals to design the accuracy of parts. After actual parts processing and assembly, they will know whether the designed parts accuracy can meet the assembly accuracy requ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/23
Inventor 张卫黄冰陆宝春王水王敏其张登峰宫志远王菡珠胡朝朝
Owner NANJING UNIV OF SCI & TECH
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