MLD-S Tech-FB Library Description - Bosch Rexroth

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Rexroth MLD-S Tech-FB Library MLD-S Technology Library 1-23 Fig. 1-31: Cut angle Real Master Axis The cut cylinder follows a master axis, which represents the web speed. The web speed is measured with a measuring wheel. The master axis must be configured such that the transported web length in one master revolution corresponds with the circumference of the cut cylinder. With a linear cam the knife would cut the "synchronous format". For other formats the cut cycle must be reduced or extended. The cut cycle - and thus the cut length - is defined by the electronic gear. Fig. 1-32: The importance of the master axis to the cut process Adjusting the knife position The cam profile always has a fixed reference to the master axis. The initial profile generated with the CamBuilder or a PLC function block starts at 0°. The cut position in the synchronous part of the profile is defined as 180°. While the knife is in contact with the material, the cut cylinder must pass the synchronous part of the profile (the cut angle). Depending on the mechanical 0° position the cylinder needs an adjustment to meet this rule. DOK-MLD-S*-TechFB*****-AW01-EN-D
1-24 MLD-S Technology Library Rexroth MLD-S Tech-FB Library Fig. 1-33: Knife position adjustment Cam Profile Calculation The PC program CamBuilder is an offline tool to design cam profiles. It can be used to download profiles for first tests or to design the initial cam table for applications which are covered with fixed profiles. A special wizard is available to calculate cam profiles for crosscutter applications. Based on the input parameters for format length, cut cylinder diameter and cut angle the wizard generates a profile as shown below. DOK-MLD-S*-TechFB*****-AW01-EN-D
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MLD-S Tech-FB Library Description - Bosch Rexroth

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