Influence of the parameters of deforming cutting on the features of the resulting slotted filter structures

OBRABOTKAMETALLOV Том 23 № 4 2021 TECHNOLOGY The corrugations were obtained by stamping with an elastic medium, as which solid polyurethane was chosen (Fig. 4). Fig. 4. Stamping corrugations with polyurethane Fig. 5. Parameters of corrugation obtained A steel molding bar 5 with a diameter of 1.5 mm was placed between the strip 2 and the steel punch 3 , after which the strip and the bar were pressed with a punch into a polyurethane pillow 4 , placed in the hol- low of the holder 1 , as a result of which the strip partially bent around the bar, forming a corrugation. For mutual positioning of the bar and the strip in the cage, guide grooves are provided. The geometric parameters of the corrugation (Fig. 5) are determined by the diameter of the bar, the thickness, and material of the strip, as well as the pressing force, and were t = 0.4 mm; r = 0.75 mm; R = 3.6 mm, h = 1.9 mm. When obtaining slots by the deforming cutting method, the dependence of their width b on the feed S o , the tool cut- ting edge angles φ and φ 1 has the form [20]: b = S 0 (sin  1 – sin  ). By this relationship, the width of the slots theoretically takes zero value when the major φ and minor φ 1 tool cut- ting edge angles are equal. However, for fi ltration, it is de- sirable to have a slotted gap perpendicular to the axis of the pipe blank, which requires the designation of the minor tool cutting edge angle φ 1 close to 90°. Thus, the width of the slotted gap will be determined by the major angle of the tool φ and the value of the feed S 0 . The dependence of the theoretical width of the slotted gap on the tool feed at different angles φ is shown in Fig. 6. The in fl uence of the angle φ 1 on the width of the slotted gap is not signi fi cant and is shown in Fig. 7. The length of the slots l depends on the pro fi le of the corrugations and the depth of cut.After the beginning of the full-depth cutting, the length of the slots increases sharply until the cutting depth t r = 0.45 mm is