CAMMIS integrated manufacturing system for the pro

Cam/mis integrated manufacturing system for steel structure parts production

according to relevant information, the steel consumed by welded steel structures accounts for about 45% of the total steel consumption. Therefore, the production technology progress of welded steel structure and its parts has great economic benefits

at present, in shipbuilding, the outer diameter of the tubular sample should be measured once in two mutually perpendicular directions at its end. The factory and heavy machinery factory produce welded steel structural plate parts, and the history of using numerical control cutting technology (including flame, plasma, laser) has been very long. Many factories take numerical control cutting method as the main production process of sheet parts

in the field of welded steel structure production, production and technical preparation have a great impact on improving quality, improving comprehensive production efficiency and improving material utilization; Specifically, setting out, NC cutting programming, nesting, production design and process design

the design of welded steel structure, the workflow of production preparation and the general status quo are shown in Figure 1:

the actual work can be divided into several types or stages:

1. Stay in the traditional manual operation. In addition to the use of isolated computers for NC cutting programming and nesting, designers basically rely on blueprints or manually prepared cutting program lists to transmit information to technologists and production designers, and technologists and production designers to NC cutting programming and nesting personnel

2。 In the case that designers, technologists and numerical control cutting program layout personnel have used computer-aided to complete their work, data sharing is not realized by using networks and databases. The three working stages were all completed in isolation

3。 Under the condition that designers, technologists and numerical control cutting program layout personnel have used computer-aided to complete their work, the use of computer networks, databases and management programs to achieve drawing information and attribute numbers. The ball screw has almost no self-locking, while the trapezoidal screw has a certain self-locking data sharing. The three working stages are organically combined. In the design and production design stages, it is closely combined with the management information system to form a cad/cam/mis integrated man-machine integrated system

in stage 1, the prominent shortcomings are slow information transmission, difficult to accurately design the proportion of welding steel structure drawings by hand, resulting in many drawing size problems, large workload in understanding drawings, modifying and supplementing drawings and setting out, long cycle, difficult inspection and review, and many errors. Therefore, it seriously restricts the improvement of steel structure production efficiency and benefit

in stage 2, the disadvantage is that data sharing is not realized by using networks and databases. There is a lot of repetitive work, so it also brings opportunities for mistakes and it is difficult to shorten the technical preparation cycle. As the main means for designers to provide data is still blueprints, the quality requirements for the proportion of CAD drawings are not high. It is difficult for setting out or production designers to directly use CAD drawings, and it is still difficult to fundamentally solve the problem of drawing size and process, and it is difficult to improve the efficiency of the subsequent process

the main difference between stage 3 and stage 2 is that design drawings include CAD graphics of part drawings and various attribute data, which are shared between designers, process and production designers, NC cutting programmers and even production organization managers by using computer networks and databases. Therefore, it can minimize the time and errors in the data transmission process of the traditional working mode. Because the staff of the next process needs to directly use the CAD drawings and various attribute data provided by the staff of the previous process in the computer, it puts forward strict requirements for the accurate size proportion of the design drawings and part drawings. In the design and production design stages, it is closely combined with the management information system to form a cad/cam/mis integrated man-machine system, which means that each staff member is responsible for the data entered by himself in the computer, and only himself is responsible for input, modification and deletion. Combining with the management information system means tapping the production potential that may exist in the end. Pave the way for maximizing benefits

we have done some work in establishing a computer-aided cam/mis integrated system for steel structures. Sscam version 2.0, an integrated manufacturing system software for computer-aided manufacturing and auxiliary management of CNC cutting of steel structures and other sheet parts, has been preliminarily developed. Sscam is developed under the background of a large multi variety and small batch heavy machinery steel structure production unit. As the first-line production staff engaged in NC cutting and processing programming, Jin min developed spray free materials such as ABS, PP, pc/asa and pc/abs. When using the NC flame cutting machine and its supporting software Columbus from ESAB company in Germany, he had a deep understanding of the NC cutting machine and Columbus software, and absorbed its advantages to develop his own sscam system. Sscam is suitable for manufacturers that use flame, plasma, laser, high-pressure water and other CNC cutting processes to produce steel plates or other plate parts

sscam's main structure modules and input and output are shown in Figure 2:

sscam's functional modules, the database can be established on the network, and can be distributed (5) select the sample shape in the "sample parameters" column. Through customs, it can communicate with other management information systems or graphic libraries and databases of design departments

1。 Lofting and the generation of part geometry and working drawings

some older NC programming software systems adopt the working mode of NC machining special language. Sscam does not use this low efficiency method and adopts the advanced CAD working mode. Sscam design