Cost forecasting model for order-based sheet metalworking

Abstract

This paper deals with a cost forecasting model for order-based sheet metalworking. The model has been developed on the cost analysis performed by comparing traditional manufacture of sheet metal parts (dies and presses) with rapid manufacture (RM) as CNC punching, laser cutting, and bending in terms of the cost per part unit made in various quantities. The findings show that it is more economical to apply RM methods for some sheet metal design geometries than traditional approaches in the production of thousand units. The developed cost forecasting model has been tested and adopted in two sheet metalworking companies. It furnishes the possibility for producer to find quickly and to estimate the product cost at an early stage of order-based sheet metalworking industry with satisfactory accuracy. The proposed model is being implemented both in industry and university education process.

Integrated knowledge-based model of innovative product and process development

“…In fact, the data presented in Table 3 have proved to be true with a probability of 0.8-0.6. The last step of development is forecasting the product manufacturing costs, applying expression (10). The experimental investigations into the manufacturing costs of the developed forecasting model at an early product design stage have shown acceptable accuracy -the errors have been in the limits of 5 to 12 percent.…”

“…Methodology, described in references [ 10,13 ], has been employed for the definition of labour costs 3 .…”

Production cost model of the multi-jet-fusion technology

“…The first difference is that the MJF technology requires the application of the fusion and detailing agents, which are not used in the SLS technology. Therefore, the equation for the material costs of the MJF technology (8), includes the addition of the second term, described by equation (10), which does not exist in the respective equation for the material costs of the SLS technology. Rather high costs of the fusion agent and the detailing agent thus increase material costs of the MJF technology in comparison to the SLS technology.…”

“…The initial cost models were based on experiences of injection molding, and they considered only variable AM costs, including machine costs per part, labor costs per part, and material costs per part. 9 Such models, which influenced comparisons with other technologies, 10 neglected important aspects of AM technologies, such as the ability for recycling of the used material and requirements for extensive post-processing. An important breakthrough in the development of cost models was the separation of the AM costs to direct and indirect costs, which led to the proper consideration of high indirect costs of the AM technologies, 11 which exposed the importance of the proper treatment of the utilization of the capacity of the used machine.…”

The Development of the Intelligent Forecasting Model for Productivity Index in Manufacturing

“…The module was tested in a few industrial companies of Lithuania using laser cutting and CNC punching technologies. In contrary to previously described testing of the parameter-based module [16], experimental components were taken from outside the company. This was decided aiming to broaden the variety of components tested and disassociating the research from traditional components processed by the companies.…”