US2003074942A1PendingUtilityA1

High performance machine with thermal compensation for programmed sheet bending with constant bending angle

38
Priority: Oct 22, 2001Filed: Oct 8, 2002Published: Apr 24, 2003
Est. expiryOct 22, 2021(expired)· nominal 20-yr term from priority
Inventors:Wolfgang Kunze
B21D 5/045B21D 5/00
38
PatentIndex Score
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Claims

Abstract

A sheet metal bending machine is provided with a bending unit moved by hydraulic cylinders with sliding pistons. The cylinders are controlled by a closed loop control system comprising temperature measuring means for measuring the cylinder temperature, position detecting means for detecting the piston position and a control unit for varying the rate of hydraulic fluid fed to the cylinders according to the measured cylinder temperature and the detected piston position.

Claims

exact text as granted — not AI-modified
1 . Sheet metal bending machine with a bending unit moved by hydraulic cylinders with sliding pistons, characterised by a closed loop control system comprising temperature measuring means for measuring the cylinder temperature, position detecting means for detecting the piston position and a control unit for varying the rate of hydraulic fluid fed to the cylinders according to the measured cylinder temperature and the detected piston position.  
     
     
         2 . Sheet metal bending machine according to  claim 1 , characterised in that said control unit is of numerical type.  
     
     
         3 . Sheet metal bending machine according to  claim 1 , characterised in that said control unit is programmed according to a mathematical model of a panel.

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