## 5 Conclusions  
The procedure for designing the technological process of production and the forming tool presented in this paper can be applied in cases where it is necessary to design an appropriate production technology for a small number of parts by forming to achieve the minimum price of one piece of the manufactured part.  
The use of a rigid metallic forming tool is usually the most suitable solution because of the achievement of small bending radii with sufficient precision, the greater durability of the forming tool compared to tools made of plastic materials, and also because most companies have a tool room where such a tool can be cheaply produced and subsequently maintained. Metallic materials, such as steel or hard alloys, can provide the appropriate hardness and durability required to form a wide range of materials, including high-strength metals.  
To avoid great thinning or cracking during bending in the design of a bent part, it is useful to calculate and take into account the smallest recommended internal bend radius, the largest allowable bend radius, the minimum length of the bent arm, and the springback angle after bending. Simulating the behaviour of materials during the bending process also helps refine the design and select suitable manufacturing parameters.  
The bending solution methodology allows for the design and modelling of bending operations to achieve the desired shapes. When working with materials of different properties, such as different ductility or hardness, the methodology can be used to optimise the bending process for each specific material. The methodology of material bending solutions is important in minimising material suspension, which is important in cases where precise dimensions must be achieved after bending.  
The effective application of the material bending solution methodology requires accurate input data on material, geometry, and process conditions. Some simulation tools and analyses can be costly, especially for smaller companies or individuals. Combining the simulation methodology with experience can lead to successful results in real industrial applications.  
Based on experiments, it was verified that if the main aim is to achieve a low cost of production of the forming tool for the specified small number of cutting blade pieces, the heat treatment of the tool working parts can be eliminated, and, by that, the grinding of the tool working parts after their hardening is also eliminated.  
Based on experiments, it was verified that at steels with a considerable strength of (1000 to 2000) MPa and low plasticity stock, the blank made from it needs to be soft annealed before bending and then after bending the blank in the bending tool to obtain the original values of the mechanical properties of the material to carry out the heat treatment, i.e., hardening and subsequent tempering to the required hardness.  
Further work may be aimed at comparing the results of bending with a rigid metallic forming tool and bending with one or both parts of the plastic forming tool, comparing the wear of the rigid metallic forming tool and the plastic tool, and determining the effect of the material of the tool on the surface quality of the formed part.  
Conceptualization, R.C. and T.P.; methodology, R.C.; software, R.C.; validation, T.P.; formal analysis, R.C.; investigation, R.C. and T.P.; resources, R.C.; data curation, T.P.; writing--original draft preparation, R.C.; writing--review and editing, R.C.; visualization, T.P.; supervision, R.C. All authors have read and agreed to the published version of the manuscript.  
This article was supported by a Czech project No. SP2023/020 with the name 'Research and Optimisation of Engineering Technologies' financed by the Ministry of Education, Youth and Sports of the Czech Republic.  
Not applicable.  
Data Availability Statement: Data is contained within the article.  
The authors declare no conflict of interest.