Integrally cast core mechanism with built-in steel wire rope coated with polyurethane

Abstract

The invention relates to an integrally cast core mechanism with a built-in steel wire rope coated with polyurethane. The integrally cast core mechanism comprises a built-in flexible framework and a polyurethane outer layer, the outer side of the flexible framework is coated with the polyurethane outer layer, the built-in flexible framework comprises a transition joint, the steel wire rope and a buckle, the head end of the steel wire rope is fixedly connected with the transition joint in a buckling manner, and the tail end of the steel wire rope is fixedly connected with the buckle in a buckling manner; the buckle is embedded into the polyurethane outer layer; the transition joint is of a tubular structure, and an internal thread structure is machined at the head end of the transition joint; a U-shaped groove is machined in the outer contour of the tail end of the transition joint along the Z axis, and the polyurethane outer layer can be embedded into the U-shaped groove in the casting process to connect the transition joint and the U-shaped groove; and the buckle can be embedded into the polyurethane outer layer in the casting process. The structure that the steel wire rope metal framework is arranged in the middle and coated with polyurethane is adopted, under the condition that the requirement for the bending angle of any position of a product is met, the axial rigidity of the core is greatly improved, and the stability of the production process is improved.

Description

technical field [0001] The invention relates to an integrally cast core mechanism with a built-in steel wire rope and covered with polyurethane. Background technique [0002] With the continuous advancement of the lightweight of automobile bodies, the proportion of aluminum alloy and high-strength steel materials in the body continues to increase. Due to product shape requirements, raw material straight strips need to be bent into product pieces with one or more curvature shapes. Forming processes such as stretch bending, roll bending, free bending, pipe bending, and pressing are widely used in the forming of various types of materials as important means of forming. In order to avoid defects such as collapse or convex-concave deformation during the bending process of closed cavity products, it is necessary to fill the core mechanism support inside the closed cavity during the molding process. The existing technology generally uses a plurality of steel core joints as the co...

AI Technical Summary

Problems solved by technology

The existing technology generally uses a plurality of steel core joints as the core or high molecular polyethylene material as the core to support the inner cavity of the profile. The disadvantages of the steel core are as follows. First of all, the core is made of steel, which is easy to cause damage to the product inner cavity. Scratches; Secondly, for a cavity with a smaller cut-off shape, the design size of the core and pin shaft becomes smaller due to the size limitation of the internal cavity, and the core segment and the mandrel are easy to break

Next, for product features with small arc forming radius and long arc section, the core ejection force of this kind of core increases, which is easy to cause core breakage

Finally, steel cores can only be used for two-dimensional arcing, and cannot meet the requirements for products with three-dimensional bending characteristics

The high molecular polyethylene material core will be squeezed by the inner cavity of the product during the molding process, and under the action of friction, it will produce a pulling force in the length direction of the core, thereby elongating the core and reducing the cross-sectional size of the core , thus affecting the tolerance of the product's molding contour size, resulting in unstable production of the product

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