The problem is proposed that the bolt node ball constitutes the bolt node ball CAD/CAM integrated system according to the above processing method and CAD. The information of the CAM machining features is transmitted by CAD, and the designer does not consider the processing order of the node ball holes in the modeling process, which means that the processing sequence of the CAM planning is random. This will increase the path of the tool, especially when the number of threaded holes to be processed is large. A bolted node with n holes has a ball processing path of n. To find the optimal path, the whole processing time is the shortest and the most efficient. Its optimization process can be attributed to the combination optimization problem in mathematics: under the condition of a limited number of solutions, find the optimality to satisfy the constraint. solution. The following definition is used: S is a finite solution set of a problem, and a cost function V(x) can be calculated for each solution xIS. If there is always V(x) for V(x)IS The sum of the indexing angles of a machining path is: H = 6n - 1i = 1 (Ai + Bi), (i = 1, 2, 3, n - 1). The indexing angle of the jth processing path is: Hj, (j = 1, 2, 3, n). The overall minimum solution is: minH=MIN(Hj). What is to be found is the optimal path xi={s1, s2, sn}, so that Hi is the smallest. The genetic algorithm encoding is calculated for the 7-well node sphere as shown, and the genetic algorithm process is as follows. The 7-hole node sphere indicates that the coding gene encoding is the first step of the GA method. When encoding the problem space, it should be observed that all points in the problem space (candidate solutions) can be expressed as points (chromosomes) in the GA space. The points (chromosomes) in the GA space can correspond to candidate solutions in all problem spaces. The chromosomes correspond to the candidate solutions one-to-one, that is, the completeness, soundness, and non-redundancy rules of the coding. The usual binary encoding is suitable for the optimization problem that the independent variable is a numerical quantity, and the mutual influence between the independent variables is less. For the 7-hole bolt node ball, a processing sequence of 7 holes is pursued, and natural coding should be adopted. Let 1, 2, and 7 be the numbers of the holes, s1, s2, and s7 represent the sequential numbers when the holes are sequentially processed, and xi is the ith of the many paths. For example, the sequence xi={s1, s2, s7} is a processing path, indicating that s1, s2, and s7 are sequentially processed. 2 The group setting randomly generates w processing paths, which are denoted as S={x1, x2, xw}.w is the total number of individuals in the initial group, ie the population size, S is the first generation of w processing sequences, and xi is the initial group S. The i-th individual in the middle represents a processing path. The size of the population affects the results of genetic optimization and the efficiency of the execution of the genetic algorithm. When w is too small, the optimization performance will not be too good; the larger group size can reduce the chance that the genetic algorithm 33 process and the process equipment Page3 method fall into the local optimization solution; but the large group size means high computational complexity. Consider the actual number of holes in the bolt node ball, take w=20. Conclusion In this paper, the problem of large bolting node ball processing path and large calculation amount is optimized by genetic algorithm. The algorithm is simple in coding, easy to understand and high in execution efficiency. The calculation results show that the genetic algorithm is superior to the conventional algorithm in terms of optimization results and calculation time. Code parameters can be used for research and calculation of similar problems with a few modifications.
UPE plastic,full name UHMWPE (ultra high molecular weight polyethylene) is a kind of thermoplastic engineering plastic with excellent properties of linear structure, with a molecular weight of more than 1.5 million.mainly have ESD UPE SHEET,CONDUCTIVE UPE.
Small density, good wear resistance, self - lubricity, impact resistance, corrosion resistance and so on.
Advantages:
1. Average molecular weight about 5,000,000 to 9,000,000;
2.The best abrasive assistance of all plastics , which 4 times higher than that of nylon 66 or teflon and 6 times higher than that of carbon steel;
3.Extremely high impact stength ,which is twice as high as PC ,5 times as high as ABS,it also retaines high toughness at liquid nitrogen temperature (-196'C);
4.Low friction coefficient ,lubricity is equal to that of Teflon ;
5.The best impact energy absorption value of all plastics ,with very good sound reduction effect ;
6.High chemical stability ,capable of resisting various types of corrosion and organic media within certain temperature and concentration range;
7.Strong adhensive resistance which is only second to Teflon;
8.UHMW-PE Plastic is safe , healthful and non-toxic and be can used in contact with food and drugs ;
9.Low density than any other thermoplastic ;
10.Excellent electrical insulation and static resistance ,good resistance to high energy radiation;
11.Moderate mechanical strength,stiffness and creep-resistant property'
12.Outstanding machining property ,very low water absorption .
Deficiencies:
Compared with other engineering plastics, UHMW-PE Plastic is resistant to heat resistance, stiffness and hardness, but can be improved by means of "filling" and "crosslinking".
From the point ofheat resistance, the melting point of UHMW-PE Plastic is approximately the same (136 ℃) and ordinary polyethylene, but because of its big molecular weight, melt viscosity high, so the processing difficulty is big.
Applications:
Papermaking industry : suction box boards ,scrapper,molding plate ,beating ,gear .
Mining industry : charging barrel ,abrasive and adhensive -resistant back lining for warehouses.
Chemical industry : acid pump ,fliter plate , worm gear ,bearing .
Food industry :packing machinery parts ,bottle guide ,screw .wear plate ,slide away ,stud weld ,roller and other transmission parts.
Tenxile industry : buffer board
Food processing industry : chopping block ,refrigerating plant
Wharf:anti-collision board
Specification: the thickness of UHMW-PE Plastic sheet material can be produced from 0.3mm to 1.9mm, the normal width is 600mm, the width can exceed 1200mm, and the length is not limited.
Color: Black and white, can also be made another color, and the color order is 500KG.
Modified varieties: UHMW-PE Plastic can be added to the Glass Fiber, copper powder, and molybdenum disulfide enhancement plate according to customer's requirements.
Product certification: most environmental certification reports and safety reports forraw materials, such as SGS report, CTI report, UL report, MSDS safety information, etc.
Uhmwpe Plastic Rod,Hdpe Plastic Rod,White Pe Plastic Rod,White Hdpe Plastic Rod Dongguan Noegem Plastic Products Co.,Ltd , http://www.noegempLastic.com
The thickness of plate can be produced from 2mm to 180mm, the usual specification of 2-10mm is 600mm* 1200mm, and the commonly used specification of 10-180mm is 1200*3080mm. UHMW-PE Plastic can also be customized according to requirements, and the width cannot exceed 1200mm, and the length is not limited.
Add antistatic agent to the permanent plate, the volume resistance value of 10 to the 6 to 9 power.
Add flame retardant to the flame retardant board from UL 94v-0 to HB combustion grade, and other modification requirements are required to customize various additional properties according to the actual use of the customer.
Bolt frame action line type favored strategy