Computer--aided metal strip layout.

Sindila, Gheorghe ; Lupeanu, Mihaela ; Rohan, Rodica 等

1. INTRODUCTION

The paper brings forward a programme that determines the optimal layout for the outline of the parts that are punched out from a metal strip.

The material saving in the cold compressing process can be achieved through: designing a technological form of the outline leading to a layout without stamping trims (fig.1), establishing the correct cell connector size (fig. 6), designing the optimum metal strip layout for punching.

[FIGURE 1 OMITTED]

To decrease the necessary time to highlight the multiple variants of cutting-on, the efficiency calculation and determination of each optimal variant, the programme "Optimum layout" was designed.

2. OPTIMUM LAYOUT

The suggested program, "Optimum layout", is quite different from those produced by similar specialized companies, in the first place because it is a particular application to the cutting-on on semis in the shape of metal strips with standard widths. The program executes on command whichever among the acknowledged types of layouts (on a straight line, tilted, on several rows, etc.) without running through all the intermediate variants. As perspective, the programme will be able to fully accomplish a combined layout. This implies the possibility to dispose two or more pieces on the metal strip aiming to a rational use of the material.

This programme is equipped with a library of data on standardized thicknesses and widths of metal strips depending on the value of the cell connectors for multiple variants of layout. Each activity of the algorithm shown in Figure 2, programmed in Lab View (fig.3, 4), finally allowed through the cutting--on coefficients and use of material, Kc, respectively Ku (fig.5), to emphasize the optimal metal strip layout scheme (fig.5).

[FIGURE 2 OMITTED]

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Depending on the type of layout studied (on a straight line, end-to-end, tilted, coalesced, on several rows) the programme automatically shows optimal metal strip layout (Fig. 7).

[FIGURE 7 OMITTED]

3. CONCLUSION

Computer-aided cutting--on allows taking into consideration numerous variants of cutting--on and the rapid and objective determination of the optimum scheme of cutting--on. The designed programme can make available to a user a ranking of analizated layout schemes, according to decreasing values of the coefficients of efficiency.

4. REFERENCES

Brabie, Gh. (2004). Deformarea plastica la rece a tablelor metalice (Sheet metal cold plastic strain), Bucharest, 2004.

Sindila, Gh. (2008). Tehnologii de fabricare prin presare la rece (Cold compressing manufacturing techonologies), BREN, Bucharest, 2008.

Ungureanu, Ion (2004). Tehnologii de prelucrare a profilelor prin deformare plastica volumica la rece (Profile manufacturing technologies using cold compressing), Bucharest, 2004.

National Instruments Corporate Headquarters (2008), NI Ultiboard User Manual, Available from: http://digital.ni.com/manuals.nsf/websearch/8C021D4E254 0C2208625742400646DA8 Accessed: 2008-01-12.

Braha, V.; Nagat, Gh., Negoescu,F. (2003), Tehnologia presarii la rece (Cold compressing Techonology), Iasi, 2003.