## 4 Discussion  
The design of the cutting blade material must be carried out taking into account the type of material to be cut and the required hardness of the blade (see Section 2.1.1). The design of the cutting blade must be done with respect to the application. In the present case, for access to corners and tight spaces, the tapered blade point design was designed with the cutting edge on the lateral sides of the blade (see Section 2.1.2). In the design of the 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 (see Section 2.1.2). Before manufacturing the forming tool, it is useful to verify the designed manufacturing technology by simulations in a program using the finite element method to eliminate the risk of arising defects in the forming process (see Sections 2.2 and 3.1). In the solved case of manufacturing the cutting blades of the oscillating cutter after the project of manufacturing technology, the rigid metallic forming tool (see Section 2.1.4) was manufactured and, by it, the test pieces of the cutting blade (see Section 3.3) by which the correct function of the designed bending tool was successfully checked. The use of a rigid metallic forming tool was chosen to achieve small bending radii with sufficient accuracy, to achieve the parallelism of both bends and also for economic reasons. The use of rigid metallic forming tools is suitable in most companies because they usually have a tool room in which such a tool can be produced. Rigid metal tools are capable of transmitting higher forces, which is important when forming a material with a greater thickness or when a greater force is required to bend the material. Metallic materials tend to deform less than plastic materials during the forming process, which can help maintain the accuracy and repeatability of production. Metal tools tend to have a greater wear resistance than plastic tools. This is crucial when materials of high hardness or an abrasive nature are regularly processed. Metal tools can be used at higher temperatures without the risk of deformation or permanent damage, which is important when forming materials that require elevated temperatures. Metal tools can often be more easily maintained and repaired, contributing to lower maintenance costs and longer tool life. Another alternative to a rigid metal forming tool is the production with a hydraulic or mechanical press brake [33; 34]. This alternative can be considered if the company already has such a machine and would incur only the cost of a bender and die for this type of machine. In the case of the manual feeding of the blank, it would be difficult to achieve the parallelism of both bends. The advantage of manufacturing with a hydraulic or mechanical press brake is the flexibility to create different shapes and sizes, which is useful in cases where product shapes change frequently. To reduce tooling costs, rubber or flexible tools can be used together with one rigid metallic die or punch, to enforce a predictable and repeatable geometry of the stamped parts. If the complete tooling setup is built with deformable tools, the quality and geometry of the final part are hardly predictable and only prototypal production is generally possible [35]. The use of unfilled or reinforced plastic materials for the production of forming tools [17; 18; 19] can be more difficult for a company due to the need for a solution in cooperation with another company. As a rule, it is not worth taking a one-at-a-time solution for a single forming tool, but it can be considered when dealing with multiple types of forming tools. Plastic materials are generally lighter than metals, which can be advantageous if the reduction of tool weight is important. Plastics can also be easier to machine, which makes it easier to produce complex shapes. Plastics usually do not have as high mechanical strength as metals.