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verstt
översättmeeting 2012-09-12; skultuna, benteler aluminium systems attending: bas: klas goran nilsson, lars cedervall, björn erik aas, ulf stjerndahl bmb: r.stockter trimming and scrap: • aluminum: to prevent from sticking to the tool, the material is oiled a lot, so the scrap in the trimming and piercing might easily stick. an extra lubrification in the tool is not necessary. • punches 80 mm long, with ejectors, from dayton, standard punches without quick release • punches must be replaceable in the press • use pierce bushings (die buttons) where possible, can be fixed with keys • distance between punches and punch holder should not exceed 0.03 in standard and 0.01 for cam piercing • oscillation scrap chutes to be purchased by fibro • if scrap chutes are necessary an angle of 45 degree is demanded • punches must be regrindable 1.5 mm • scrap channels must be greater than scrap-size in all dimensions • no scrap cutter specification available • cutting clearance will be 5% of material thickness • punch diameter to center of tolerance, not 0.05 below maximum tolerance • first choice of scrap removal are the conveyors, second are oscillating units (fibro), third choice is vacuum (need to be discussed). • conveyors to be added with guiding sheets. part location: • locator pins must be hardened and polished, straight edge not higher than material thickness • ejectors must be placed near the locator pins • part locating in tool similar to reference system in the drawing (if possible) • for the rough gauging - 5mm is used ejectors: • ejector springs with preloaded springs • ejector preferred as purchased parts • all pads must have ejectors other: • gas springs can be connected, not a must. can be mounted on mounting plate • a sign is necessary: containing gas springs • cushion of the press can be used • if the cushion of the press is used: when the load is not in the center, additional pins must be used to achieve uniform load. • using screws 8.8 is feasible • any surface treatment (coating) of steels or punches is done by skultuna plant (the steels will be segmented and hardened to be prepared, not polished) • the mounting- (ganging-) plate in the lower die must have a surrounding (if possible) pocket with a drain to collect the oil from the lubricated parts • lifting element will be a swivel hook with m20 • the sensors will not detect the part directly but by a spring loaded rocker • lifting threads for all parts above 6 kg • parts not to be marked with hardness or material spec, only tool-number and pos number • material for parking stops: tecarim (see benteler tooling spec, possible loading is 12 n / mm^2) • transport straps necessary • documentation of checkpoints of the tool for the maintenance, 40000 strokes will be the service intervall • part identification stamping: 2 set of stamps must be delivered, to benteler or to skultuna standard to be decided • centering holes for tool truck necessary in base plate • maximum weight of the whole tool is 12 tons. the maximum weight of the upper die is dependent of the press. the lowest max.weight is 4 to. the max. max weight is 6 to. • the center of gravity must be within 650 mm. now the tools have a width of 1400, so the center of gravity is 700. so they cannot be loaded on the tool truck (when they are close to 12 tons) ! • for the backup press the base and top plates must be prepared for the ap

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