A special machine structure for large-angle three-step action hemming of automobile panels

Abstract

The invention provides a large-angle three-step action edge covering special machine structure for automobile covering parts. The special machine structure comprises a lower mold body, a lower die holder for positioning and holding an outer plate and an inner plate, an edge covering driving cylinder mounted and fixed on the lower mold body, a support driven by the edge covering driving cylinder to move in the horizontal direction, and a pre-bending composite knife block and a press-fit knife block both mounted and fixed on the support, as well as a portal frame mounted and fixed on the lower mold body, a guide rail and a pressure plate driving cylinder both mounted on the portal frame, an inner-plate forward pressing assembly driven by the pressure plate driving cylinder to move up and down along the guide rail, a lateral pressing driving cylinder mounted on the inner-plate forward pressing assembly and a lateral pressing male mold which can be put into lateral contraction motion by the lateral pressing driving cylinder. The large-angle three-step action edge covering special machine structure for the automobile covering parts is capable of orderly completing the three steps of actions of primary pressing pre-bending, secondary free pre-bending and press-fit edge covering in one working operation, and guarantees that the appearance surface of a press-fit edge covering associated part of a workpiece during large-edge covering angle press-fit edge covering is protected against buckling deformation and depression and the appearance ridges are smooth.

Description

technical field [0001] The invention relates to an automobile body, in particular to a special machine structure for large-angle three-step hemming of an automobile cover. Background technique [0002] For the hemming treatment of the inner and outer panels of the existing automobile panels, the process of using the pressing mold and the hemming machine to implement the hemming process is to first freely pre-bend, and then to press and form the two-step action hemming. like figure 1 The indicated hemming angle θ is a large-angle hemming of 105°~150°. When free pre-bending from the large hemming angle θ to the angle before lamination of 40°~45°, the pre-scimitar block 1 and the outer plate wrap The contact of the edge surface 3 produces a pre-bending moment M around the root of the edge surface, which will cause warping, deformation and depression of the appearance surface 2 of the associated part of the edge edge, as well as defects such as unsmooth appearance ridges, which...

AI Technical Summary

Problems solved by technology

like figure 1 The indicated hemming angle θ is a large-angle hemming of 105°~150°. When free pre-bending from the large hemming angle θ to the angle before lamination of 40°~45°, the pre-scimitar block 1 and the outer plate wrap The contact of the edge surface 3 produces a pre-bending moment M around the root of the edge surface, which will cause warping, deformation and dents on the appearance surface 2 of the associated part of the edge edge, as well as defects such as unsmooth appearance ridges, which seriously affect the appearance quality of the car body

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