Anchor bolt expansion sleeve and manufacturing method thereof

Abstract

The invention discloses a manufacturing method of an anchor bolt expansion sleeve. The method comprises the steps of manufacturing a petal shaped metal sheet body, wherein the petal shaped metal sheet body comprises a plurality of petal bodies, the quantity of the petal bodies is equal to that of load tongues of the expansion sleeve, and the adjacent petal bodies are in arc transition; arranging a polygonal central hole in the middle of the sheet body, wherein the sides of the polygonal central hole are as much as the load tongues of the expansion sleeve and are corresponding to the load tongues of the expansion sleeve in positions, and a circular corners is formed on the top corner of the polygonal central hole; manufacturing the expansion sleeve through the metal sheet body by the punching process, wherein the punching is carried out in the thickness direction of the sheet body.

Description

technical field [0001] The invention relates to a method for manufacturing an anchor bolt expansion sleeve, in particular to the structure of a metal stamping sheet used in manufacturing the expansion sleeve. The invention also relates to the anchor expansion sheath produced by this manufacturing method. Background technique [0002] The back bolt used in the curtain wall of the external envelope of the building, the structure is as follows figure 1 , figure 2 As shown, it includes an anchor rod 4 , an expansion sleeve 2 , a sleeve 1 for pushing the expansion sleeve 2 , and a flexible sleeve 3 . [0003] The expansion sleeve 2 has various structures, one of which is as image 3 , Figure 4 , Figure 5 As shown, it is composed of a base section 2-1 and several load tongues 2-2. The load tongue 2-2 is in the shape of a tongue or a curved tongue; the base section 2-1 and the load tongue 2-2 are integrally made, and the load tongue 2-2 is formed in one piece. The surface ...

AI Technical Summary

Problems solved by technology

[0004] Regarding the manufacturing process of the expansion sleeve 2, some are made by cutting pipe fittings, but the manufacturing process is complicated and the cost is high; there are also metal sheets that are punched to form cylinders, and the structure of the metal sheets is as follows: Image 6 As shown, the metal sheet is petal-shaped, with a circular central hole in the middle of the sheet, and the stamping direction is along the axis of the central hole. After stamping, the petals form a load tongue, and the original circular central hole forms the upper end of the cylinder.

[0005] However, due to being extruded during the stamping process, unevenness will appear on the top of the base section 2-1, such as image 3 , Figure 4 , Figure 5 As shown, the push fit between the expansion sleeve 2 and the sleeve 1 of this structure is unreliable, and the load tongue 2-2 cannot achieve balanced expansion. The bolt nut is loose, there is a hidden danger of the plate falling

If the top of the expansion sleeve 2 is further processed, such as milling the end face, or lathe cutting to form a plane, the manufacturing cost will be increased

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