PRODUCT REVIEWS
Angular accuracy in press brakes
Welding torch extraction
Can the capture of welding fumes be automatically matched exactly to the extraction torch ? A new welding torch database from KEMPER now claims to make effective torch extraction possible . Torch extraction eliminates the need to readjust an extraction hood and the welding fumes can be automatically captured parallel to the welding process .
“ For this to succeed to optimum effect , the right balance between extraction capacity and individual torch technology is required . This is stipulated by the DIN EN ISO 21904 international standard and has been given broad relevance as an issue , not least by an appeal made by the German Welding Society , DVS . Our data pool , with the parameters of around 100 torch models , now provides the basis for the optimum capture of hazardous substances by using the VacuFil i series of high-vacuum extraction units ,” said KEMPER .
Torch extraction has emerged as a hot topic in welding technology in 2021 . Demand is growing and international standardisation continues to gain momentum among manufacturers . Most recently , the DVS attracted widespread attention with an appeal for manufacturers to make the relevant data for all torches publicly available , with a view to achieving optimum extraction to protect welders .
“ Every extraction torch is different in terms of design . As a result , there is no off-theshelf welding fume extraction system which is automatically suitable for every torch . The optimum extraction capacity has to be determined individually for each model ,” explained Manfred Könning , Technical Director , KEMPER .
The company has developed its own test station and , based on the international standard , specified the relevant parameters for optimum welding fume extraction ( such as , for example , the required vacuum for the air volume flow and the resulting extraction capacity ). The data , which vary according to the extraction torch , are incorporated in the KEMPER database . The stored parameters automatically define the required extraction capacity of the VacuFil i device series . This gives the manufacturer an important body of data which facilitates torch extraction .
“ When a welder connects the VacuFil i extraction unit to an extraction torch , they simply have to select the connected torch via the touch-screen and the device automatically and permanently regulates the optimum extraction capacity , even adjusting it to changes in external conditions ,” KEMPER told ISMR .
When these key parameters are defined for other torch models or for new ones , these data are integrated by KEMPER in the cloud . The digital devices operate independently via SIM technology . Depending upon the intensity of the welding process used , power requirements of the torch and the required hose length , the VacuFil 125i , 150i and 250i versions are available with different maximum extraction capacities . T
“ W3 certification from the Institute for Occupational Safety and Health certifies that the systems comply with occupational safety standards . For the use of the VacuFil i series , data for around 100 torch models are already available . Some 15 manufacturers are already collaborating with us on this ,” concluded KEMPER . n
. kemper . eu
Vision Components provides OEM laser profilers for checking the angular accuracy in sheet metal bending pressbrakes . The VCnano3D-Z 3D line sensors reach measuring rates of up to 400Hz and a typical accuracy of <± 0.1 °. They can be directly connected to the machine ’ s PLC for real-time control of the contact pressure to boost the productivity and efficiency of press brakes .
Delem , a leading manufacturer of controls for sheet metal machines , has already completed the integration of the laser profilers in its controllers .
“ Our 3D laser triangulation systems operate autonomously , without an external computer . This provides customers with an extremely robust , low-maintenance and cost-effective solution . Featuring a compact IP67 housing and a large field of view , VCnano3D-Z sensors are easy to integrate and can be used with different dies without any conversion or adjustment ,” commented Vision Components .
The blue laser and Vision Components ’ ambient light suppression technology are designed for ‘ reliable detection on shiny and reflective surfaces ’, for example when bending stainless steel , copper , brass and foiled materials . The embedded vision system ’ s 3D analysis is also designed to correctly detect perforated metal , chequered plate metal and brushed aluminium .
“ A few profile points are sufficient for precise angle measurement , even with short sheet metal pieces ,” said Vision Components , which celebrates its 25th anniversary this year . n
. vision-components . com
The laser profiler for real-time angle measurement in pressbrakes can be directly connected to the machine ’ s PLC .
62 | sheetmetalplus . com | ISMR July / August 2021