Punching mould for inner cambered-surface towing hook mounting hole of closed bumper

Abstract

The invention discloses a punching mould for an inner cambered-surface towing hook mounting hole of a closed bumper. The punching mould comprises an upper molding board, a lower molding board, a concave mould and a convex mould, wherein the upper molding board is fixedly connected to a concave mould fixing plate; the concave mould is fixedly connected to a concave mould fixing plate; the lower molding board is fixedly connected to a convex mould base plate; the convex mould base plate is fixedly connected to a convex mould fixing plate; the convex mould fixing plate is fixedly connected to the convex mould; a discharging plate is arranged on the low molding board; the discharging plate is in floating connection to the lower molding board; a convex mould hole is formed in the discharging plate; the convex mould passes through the convex mould hole and is in sliding fit to the convex mould hole; a processed closed bumper product is arranged on the discharging plate; and the upper part of the convex mould is positioned in an outer cambered-surface towing hook mounting hole of the closed bumper product. According to the punching mould, by adopting an inversion structure for the convex mould and the concave mould, the convex mould can be used a positioning part accurate positioning-punching hole of a processed product, and is pressed to move downwards along with the discharging plate in a mould closing process to realize a convex mould punching process. While precise coaxiality of the inner cambered-surface towing hook hole and the outer cambered-surface towing hook hole and high mass-production stability are guaranteed, the production efficiency is improved.

Description

technical field [0001] The invention relates to a punching die for a bumper, in particular to a punching die for processing a mounting hole for a tow hook sleeve on the inner arc surface of a closed bumper. Background technique [0002] The structure of a closed bumper such as Figure 5 Shown, the closed bumper 17 of arc is provided with towing hook cover installation hole. The processed tow hook cover installation holes include the inner arc surface tow hook cover installation hole 17-1 and the outer arc surface tow hook cover installation hole 17-2, such as Figure 6 shown. The installation hole of the inner arc surface tow hook sleeve and the outer arc surface tow hook sleeve installation hole need to be processed separately, and the two have the requirement of coaxiality. Figure 7 Shown is the state that the mounting hole of the tow hook sleeve on the outer arc surface has been machined and the installation hole of the tow hook sleeve on the inner arc surface has not ...

AI Technical Summary

Problems solved by technology

The installation hole of the outer arc surface towing hook sleeve located on the outer arc surface of the closed bumper can be completed by online punching before feeding on the rolling line, while the installation hole of the inner arc surface towing hook sleeve is too close to the two side walls. The rolling process after punching will cause inner arc surface and side wall wrinkles, which cannot meet the process requirements; after roll forming, because the hole position is too far from the end of the bumper, the general stamping process is difficult to achieve, so the current inner arc The machining of the mounting holes for the surface towing hook sleeve can only be done by drilling or laser cutting after rolling

After the drilling process, the burrs of the product parts will remain in the product parts, which are not easy to remove, and the production efficiency of drilling is too low; laser cutting not only has low production efficiency, but also high production costs. The problem of the instability of the coaxiality of the tow hook casing hole

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