The solutions of Sheet metal bending technology 12 problems

        Sheet metal processing metal bending, riveting, welding and other treatment processes. Following in the bending process of sheet metal processing encountered problems and solutions.

        Question one: bending deflection, dimensional instability

        Reason:

        1, the design process there is no arrangement creasing or bending

        2, material feeding is not enough

        3, punch and corner wear asymmetric or nonuniform bending stress

        4, height dimensions are too small

        Solution:

        1, design pressure or bending technology

        2, increase the pressing force

        3, punch and even polished, rounded

        4, height size cannot be less than the minimum limits of size


        Problem two: after bending the workpiece surface scratches

        Reason:

        1, material surface not smooth

        2, punch the bending radius is too small

        3, bending space too small

        Solution:

        1, increase punch and finish

        2, increasing the punch RADIUS

        3, adjust bending space


        Problem three: bending angle cracks

        Reason:

        1, bending radius is too small

        2, line and bending lines parallel

        3, burrs, rough side out

        4, bad metal plasticity

        Solution:

        1, increase the punch RADIUS

        2, change the blank layout

        3, Burr change in internal round

        4, annealed or soft materials


        Question four: bending deformation

        Reason: using press bent and curved outer arms due to die when the hole location and workpiece surface friction and tension, deformation of positioning hole.

        Solution:

        1, the use of curved

        2, ejector plate pressure

        3, Jia Ma plaid in the ejector plate to increase the friction to prevent the workpieces in bending slide


        Problem five: thinning of the curved surface extrusion material

        Reason:

        1, die round is too small

        2, punch and die clearance is too small

        Solution:

        1, increases the die RADIUS

        2, amended punch clearance


        Issue six: the workpiece end up or uneven

        Reason:

        1, materials in circumferential direction on the outer surface in tension when bending deformation, elongation deformation of surface in the circumferential direction under pressure, which occurred along the direction of bending deflection face up.

         Solution:

       1, parts stamping pressure final stage punch and die should be enough

       2, made with parts outside corner of the die RADIUS

        3, increase process improvement


         Seven: uneven concave bottom

        Reason:

        1, the material itself is not flat

        2, and material contact area is small or the top of the roof material is not enough

        3, die and ejection device

        Solution:

        1, leveling materials

        2, adjust the top devices, increasing the ejection force

        3, increases ejection devices or correction

        4, plus plastic processes


        Question eight: the bending axis of two holes on both sides after the shift

        Reason: materials rebound changing the center line of the bending angle shift

        Solution:

        1, increase the correction process

        2, improvement of bending die structures to reduce material rebound


        Issue nine: bending cannot be guaranteed after the hole location precision

        Reason:

        1, product size is wrong

        2, material due to rebound

        3, positioning is not stable

        Solution:

        1, calculate blank dimensions

        2, increase the correction process or improvement of bending die for forming structure

        3, changes to the processing methods or increase process orientation


        Issue 10: bending lines not parallel with the two-hole Center Online

        Cause: bending height less than minimum bend height limit curve occurs when external expansion

        Solution:

        1, increase the bending height dimensions

        2, improved bending process


        Question 11: bending width deformation curve in the width direction of arch deflection

         Reason: because the workpiece width inconsistent stretching and shrinkage of torsion and deflection

        Solution:

        1, increase the bending stress

        2, the correction process was added

        3, to ensure that line and bending angle


        Question 12: cutting the workpiece down deflection

        Reason: cut about two straight edges to open, appears at the bottom of the workpiece deflection

        Solution:

        1, improving the product structure

        2, cut to increase process production, cut connecting, bending and then cut the process variable

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