In order to recognize the errors in the product and to determine clearly whether there is an inaccuracy of the machine, incorrect installation of tools or other reasons, one has to work interdisciplinarily with all departments at the process and communicate transparently. Faulty faults can be narrowly limited, systematic errors Are to be eliminated after thorough analysis.
The rigidity of a forming machine has a considerable influence on the deformation accuracy of tools, the tool wear and the product quality of the products. In addition, the guide geometry and the guide play between the ram and the stand are added. Elastic deflections of the machine frame and of the engine also influence the workpiece accuracy and the wear of the tools.
According to Ickert, „the accuracy is the degree of the desired approximation to a desired result.“ The scale used for the „accuracy“ represents the „best possible“ inaccuracy, i. The deviation between the desired setpoint value and the actual value. The thus selected „tolerance“ is thus a reliable and agreed deviation of the actual value from the setpoint value.
The precision behavior of presses must be designed to be functional. The design of the cross sections, production in steel welding or casting and the selection of the engine often determine the quality of the products. Parallelism of the tool fixtures / bores between table and tappet. Angularity of the ram movement to the fixed press table. Sufficient stiffness of the machine frame and little fluctuations in the working capacity of the press form the basis for economical manufacture.
A machine that is too small is constantly overloaded while an overly large machine is uneconomically produced.
The accuracy of the ram movement can be determined without load by detecting the angularity of the ram stroke in a forcible movement. The movement accuracy of the tappet under load with a forced stroke can be determined by means of a high-speed camera. The recordings are often helpful in troubleshooting.
Possible errors in the product can be attributed to various factors
1. Tipping the tappet in the downward motion guide
2.Elastic deformation of the guide or machine frame
3.Excentric load – displacement error – impact
4.Top the frame during the working stroke
5.Application error due to poor guide geometry / guide
6.Featuring parallelism between table and ram parallelism error
7.No angular stroke of the ram to the fixed press table
8.Figuous escape of the tool receptacles at the top and bottom of the tool
9.Working surfaces are locked-WZG bends through
10.Unbalanced mass-moment weight compensation