外文翻譯--自動(dòng)焊接操作系統(tǒng)（英文）

1、Int. J. Production Economics 60—61 (1999) 203—209An automated welding operation planning system for block assembly in shipbuildingKyu-Kab Cho*, Jung-Guy Sun, Jung-Soo OhDepartment of Industrial Engineering, Pusan Nationa

2、l University, 30 Changjeon-Dong, Kumjeong-Ku, Pusan 609-735, South KoreaAbstractThe block assembly process is one of the most important manufacturing processes for shipbuilding. Since block is composed of several steel p

3、lates and steel sections with predetermined shapes according to ship design, the welding operation planning to construct a block is a critical activity for shipbuilding, but this activity has traditionally been experienc

4、e based. Thus, it is required to develop an automated welding operation planning system to assemble blocks. This paper describes the development of an automated welding operation planning system for block assembly in shi

5、pbuilding. Based on the information about parts, topological relationship between parts and assembly sequences for block, the developed system performs the determination of welding postures, welding methods, welding equi

6、pment and welding materials. The developed system implemented successfully for real blocks constructed in shipyard. ? 1999 Elsevier Science B.V. All rights reserved.Keywords: Block assembly; Expert system; Operation plan

7、ning; Welding process1. IntroductionShipbuilding is traditionally a labor-intensive as- sembly industry that employs the welding process as a basic production technology. In shipbuilding, there are several types of manuf

8、acturing process planning for cutting and bending, assembly, out- fitting, and erection. Among these process planning activities, the assembly process planning is by far the most important, since the construction process

9、 for a hull block comprises approximately 48—50%*Corresponding author. Tel.: #82 51 510 2418; fax: #82 51 512 7603; e-mail: kkcho@hyowon.pusan.ac.kr.of the total shipbuilding process [1,2]. The main operation for block a

10、ssembly is the welding opera- tion. The welding operation planning problems in block assembly are very difficult to solve because all blocks are different in size, type, and constituting sub-assemblies that depend on the

11、 types of ships. Also, since this activity has traditionally been ex- perienced-based, welding operation planning in shipbuilding has been performed manually. Thus, it is very important to develop an automated welding op

12、eration planning system for shipbuilding. There is relatively very little literature available on auto- mated welding operation planning systems for shipbuilding [3,4]. This paper deals with the development of an automat

13、ed welding operation planning system for0925-5273/99/$- see front matter ? 1999 Elsevier Science B.V. All rights reserved. PII: S 0 9 2 5 - 5 2 7 3 ( 9 7 ) 0 0 1 5 1 - 0Fig. 3. Assembly levels for block assembly.first gr

14、oup is the small subassembly level; the sec- ond group consists of the intermediate subas- sembly, the unit block assembly, and the final block assembly levels. The reason for this grouping is that there is no turnover p

15、rocess in the small subas- sembly level, but the assembly levels belonging to the second group may have turnover processes. Turnover processes cause the change of welding postures that are determined before the turnover

16、process.2.2.1. Determining welding postures in the first group level The following are examples of rules to determine the welding posture for a small subassembly level. The connection types of welding joints between two

17、parts used in this rule are: Butt type (0) and T type (1).(1) IF (Part Level“SmallAssembly) (Connection Type“1) (Direction of Assembly Base“Connection Direction) (PartFrom“not Assembly Base Part) (PartTo“not Assembly Bas

18、e Part) THEN (Welding Posture“H) (2) IF (Part Level“SmallAssembly) (Connection Type“1) (Direction of Assembly Base Part“not Connection Direction) (PartFrom“not Assembly Base Part) (PartTo“not Assembly Base Part) THEN (We

19、lding Posture“V)Fig. 4. An example of a small subassembly.An example of a small subassembly is shown in Fig. 4. In this case, there are five parts, and the assembly base parts are A and B. The relationships between the p

20、arts are listed in Table 1 and the results of the determination of welding postures for this example are shown in Table 2.2.2.2. Determining welding postures in the second group levels In the second group levels, informa

21、tion for deter- mining welding postures is the same as for the small subassembly level. Welding postures are deter- mined between the assembly base part and other parts that are connected to the assembly base part in a s

22、imilar way to the small subassembly. Other welding postures are determined between parts that are not an assembly base part. If turnover processes exist, the direction of the assembly base part is changed at an angle of