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The design variables that determine the shape of the contour curve

The schematic Infusion Apparatus Mould Manufacturers of the optimized shape is as follows.IKLee et al. in the deformation area of ​​the two streamlined cavity and conical cavity during extrusion. The numerical simulation using the finite element software MARC/AutoForge further shows the effectiveness of the optimization results. Several methods of defining the mold cavity contour shape generally use piecewise straight lines, curve interpolation, curve fitting, polynomial functions, etc. The cubic spline function interpolation is used to express the mold cavity contour shape. The service life of the die is reduced; its normal stress and shear stress are reduced by nearly 50% compared to the tapered cavity. are commonly used in the optimization design of mold cavity contour..

The mathematical expression is as follows: S. The design variables that determine the shape of the contour curve in the optimization process are related to the coordinates of the nodes. Production practice also proves that its optimization effect is remarkable.  Curve interpolation requires the curve to pass the control point, but curve fitting only requires the curve to approximate the control point. Its characteristic is that the curve is within the control polygon composed of given control points and approximates the control.

The degree of deformation, the speed of deformation, and the stress-strain state of the plastic zone are closely related to the contour shape of the mold cavity, which is critical to the performance of the entire forming process. Since the above expression is a linear variable of the mold radius Y(x), it can be used to analyze both the tapered cavity and the streamlined cavity. to express the mold cavity contour curve. Obviously it does not express a smooth curve.

The distribution along the surface of the cavity is more balanced, so that the wear is less and the wear is more evenly distributed throughout the concave cavity. Compared with the tapered mold cavity, the surface friction, surface force, normal stress and shear stress of the two types of cavity are greatly improved. There is often no direct mathematical relationship between the design variables and the objective function. Blank material cavity diameter (mm ) Extrusion ratio initial temperature of the workpiece (°c) Die preheating temperature (°c) Friction coefficient extrusion speed (mm/mill) Height of reduced diameter part (mm) ~

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