Sealing and Cutting Machine Stress Analysis

Source:   Date:2014-10-28 15:46:34   Views:

According to the forces and the cross-section SEM after sealer sealing and cutting machine shearing shearing process of packaging, will be affected by shear force the material is divided into three zones. 1 is a sealing and cutting machine cut face severe deformation region near; 2 is deformed plastically deformed region near the area vigorously; 3 is rigid region, namely in this area in the whole process of sealing and cutting machine shearing forces are not without deformation. Sealing and cutting machine shearing process is primarily a glimpse of cutting machines cut the material shear, bending stress and tensile strength combined for RI.
In the sealer intense shear deformation zone there are three main forces in the sealing and cutting machine shearing process, the load generated by the movement of sealer shear corpse and P 'is the only active force, the role of the corpse, blade tip and packaging material at the contact stress concentration, when the shear strength limit sealer shear stress exceeds the material, and further expansion cracks begin until fracture. Formed on the cross-section bright sealer sealing and cutting the lateral shear zone is generated by the shearing forces squeeze pressure in the dynamic and static shear on the edge, sealing and cutting machine in the shear plane formed packaging extrusion surface, and bright the sealing and cutting machine cut face coincide. Under the pressure of squeezing effect, will increase the width of the bright band.
Under the joint action sealer shear extrusion pressure P and T, forming a synthetic squeeze pressure S. Synthesis squeeze pressure determines the final direction of fracture orientation package, theoretically speaking, synthetic squeeze the maximum pressure limit is to overcome the shear strength of the material needed for sealing and cutting machine shearing force, Sm? = ATb. Pressing the vertical direction in the synthesis pressure, the tensile force F by the action, when the anti-tensile force exceeds the maximum tensile strength limit in the cross section of the sealing and cutting machine will produce a shear crack phenomenon, which is formed on the cross-section unstable fracture surface, resulting in poor quality section. When pinch-cutting machine to cut, squeeze pressure to reduce the lateral pressure in the direction of making the synthetic squeeze closer to the loading direction, the direction of the tensile force is almost coincident with the axis of the packaging and reach the ultimate tensile . Therefore, when using the pinch-cutting machine cut way sealer cut package, unstable fracture zone becomes smaller, not even unstable fracture zone, get a good cross-section quality.