my slides for Straightening Processes (Press Straightening)
Published on: Mar 4, 2016
Transcripts - Press straightening
Straightening• In metalworking, the elimination or reduction of unnecessary curvatures in metal items by the application of external forces. Straightening is used in the production of sheets, tubes, rails, beams, and other milled items. It is also used, although less frequently, in metal consumption, for example, by forges and metal structures shops.• Distinctions are made between press straightening (batch straightening) on straightening presses, parallel- roll straightening (continuous straightening) on straightening machines, and rotary straightening by untwisting and stretching on rotary straightening machines. For some cases, Straightening could be applied manually using tools.
Press Straightening It is an innovative solution in the field of straightening technology with hi-tech Hydraulic Straightening Presses. This press can efficiently undergone a procedure from a round, flat and profile material of different hardnesses. This could be used for either C-frame presses or Gantry style presses, Straightening presses are mainly used for straightening medium or thick sheet, section, tube or round bar.
In Press Straightening, the item to bestraightened is placed on two supports and forceapplied to the uneven surface causeselastoplastic deflection. Major disadvantages arethe low precision of the straightening operationand the significant residual stress.
Straightening Process Description The workpiece or the part is manually loaded into the Straightening Press. The part is clamped at centers (or rollers) and than rotated to measure the straightening by using dial indicators. When the upper point is rotated vertically, the lever is pressed down causing the part to flex. After each and every stroke, dial indicator shows the straightness of the part so that operator can alter the depth of stroke until the straightness is within tolerance range. Repetition of the process occurs at determined points to achieve the specified straightness or TIR (Total Indicated Runout).