Die for pre-deformation part of hexagon flange bolt

Abstract

The invention discloses a die for a pre-deformation part of a hexagon flange bolt. The die comprises an upper die and a lower die used with the upper die, a die cavity is arranged in the upper die, a punching core and a punching rod are arranged in the die cavity, the punching core is in interference fit with the die cavity, the punching rod is positioned above the punching core, a segment-shaped cavity and a conical cavity are arranged in the punching core, the conical cavity is communicated with the segment-shaped cavity, the lower die comprises a lower die shell, a die sheet, a lower die core and a lock sleeve, the die sheet and the lower die core are sequentially arranged in the lower die shell, the lower die core is locked in the lower die shell through the lock sleeve, a cylindrical head cavity is arranged in the die sheet, and a cone cavity and a long cylindrical cylinder which are communicated with each other are sequentially arranged in the lower die core. According to the scheme, by the aid of the die, the pre-deformation part allowing a subsequent hexagonal head and a flange to stably deform can be produced, the extruded and cut hexagonal head can be ensured to be regular by the pre-deformation part, over-large fillets at hexagonal edges close to end faces are avoided, and the wrenching height is ensured.

Description

technical field [0001] The invention relates to a mold, in particular to a mold for a pre-deformed part of a hexagonal flange surface bolt. Background technique [0002] The production method of hexagonal flange bolts is to shape and pre-deform the coil material, and then use extrusion cutting to form the hexagonal head and flange surface. The pre-deformed parts are often made into a cone shape. After the pre-deformed part is made into a cone shape, the extrusion cutting die first squeezes downward from the small end of the cone when extrusion cutting the hexagonal head. During the extrusion cutting process, the metal is cut off after the mold contacts the blank. If the small end of the blank If it is smaller than the diagonal size of the hexagon, the extrusion cutting position of the mold must be moved down until the hexagon die mouth contacts the blank, and the parts that are not in contact with the mold become larger rounded corners, and the quality of the parts cannot me...

AI Technical Summary

Problems solved by technology

After the pre-deformed part is made into a cone shape, the extrusion cutting die first squeezes downward from the small end of the cone when extrusion cutting the hexagonal head. During the extrusion cutting process, the metal is cut off after the mold contacts the blank. If the small end of the blank If it is smaller than the diagonal size of the hexagon, the extrusion cutting position of the mold must be moved down until the hexagon die mouth is in contact with the blank, and the part that is not in contact with the mold becomes a larger rounded corner, and the quality of the part cannot meet the requirements

In addition, if the size of the conical large end of the pre-deformed part is too much smaller than the outer circle of the flange, the outer circle of the flange after extrusion will not meet the requirements, and plum blossom-shaped flashes will appear after trimming The bottom of the is not cut away, forming a hexagonal notch

After the pre-modified part is extruded, a quincunx-shaped flash is formed on the outer circle of the flange surface, and then the quincunx flash is cut off, so the material consumption increases, the material utilization rate decreases and the quality of the part is unstable

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