Optimization Method of Assembly Process Parameters for Multiple Symmetrical Objects Oriented to Assembly Accuracy
An assembly process and assembly accuracy technology, applied in data processing applications, forecasting, instruments, etc., can solve problems such as low assembly success rate, poor accuracy retention, and system accuracy and performance that cannot meet design requirements, so as to control assembly errors and ensure Accuracy of key indicators and the effect of reducing the amount of calculation
Active Publication Date: 2021-07-27
BEIJING INSTITUTE OF TECHNOLOGYGY
View PDF2 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0002] For precision / ultra-precision mechanical systems, this often happens: even if the part processing error and surface quality meet the design requirements, the system accuracy and performance after assembly still cannot meet the design requirements, that is, the assembly success rate is low
Another situation is that when the entire system is tested immediately after assembly, its accuracy and performance meet the requirements, but after a period of time, the accuracy changes, that is, the accuracy retention is poor
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0022] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0023] The invention discloses a method for optimizing assembly parameters of multiple symmetrical bodies oriented to assembly accuracy. The assembly surface on the part is parameterized through curve and surface interpolation, the assembly relationship is parameterized through the space transformation matrix, and the assembly constraint and evaluation index are parameterized through assembly analysis, so that the entire assembly process is parameterized. The mathematical model of the assembly process is established to quantify the assembly process parameters, which not only improves the digitalization of assembly, but also makes assembly no longer completely dependent on worker experience, reducing assembly uncertainty, such as figure 1 shown.
[0024] For the convenience of description, the following definitions are made:
[0025] Table 1 Symbol Defini...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The present invention provides an assembly precision-oriented method for optimizing assembly process parameters of multiple symmetrical bodies. The specific process is: initializing the rotation amount θ of the kth part around the coordinate axis z zk ; Calculate the rotation amount θ of the kth part around the coordinate axis x, y according to the constraint relationship and the objective function xk ,θ yk and the translation amount dz of the kth part along the coordinate axis z k ;Constrain the movement in the x direction and y direction during assembly, according to the current four parameters (dz k ,θ xk , θ yk ,θ zk ) to calculate its corresponding transfer index; when the transfer index meets the requirements, complete the transfer of parts according to the current parameters, otherwise, optimize the rotation amount θ of the k-th part around the coordinate axis z zk Continue to calculate until the assembly index meets the requirements. The present invention constrains the movement of x, y direction when transferring, four parameters (dz k ,θ xk ,θ yk ,θ zk ) is divided into two layers, adopting a layered solution method, and performing linearization processing, which simplifies the calculation process, greatly reduces the calculation amount, improves the calculation efficiency, and makes this parameter optimization method applicable to actual production.
Description
technical field [0001] The invention relates to an assembly precision-oriented method for optimizing assembly process parameters of multiple symmetrical bodies, belonging to the technical field of precision assembly. Background technique [0002] For precision / ultra-precision mechanical systems, this situation often occurs: even if the part processing error and surface quality meet the design requirements, the system accuracy and performance after assembly still cannot meet the design requirements, that is, the assembly success rate is low. Another situation is that when the entire system is tested immediately after assembly, its accuracy and performance meet the requirements, but after a period of time, the accuracy changes, that is, the accuracy retention is poor. For example, the indicators "drift rate" and "stable period" used to measure the performance of the gyroscope in the precision navigation and guidance system are closely related to the machining error and assembl...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/04G06Q50/04
CPCG06Q10/04G06Q50/04Y02P90/30
Inventor 金鑫刘志华张之敬张秋爽尚可张卫民
Owner BEIJING INSTITUTE OF TECHNOLOGYGY