An anchor bolt expansion sleeve and its manufacturing method

Abstract

A manufacturing method of an anchor bolt expanding sleeve, the method comprising: manufacturing a metal sheet member, the sheet member having a shape of a flower with petals and comprising several petal members, wherein the number of the petal members is equal to the number of load tongues (2-2) of the expanding sleeve (2), and a curved transition is adopted between neighboring petal members; arranging a polygonal central hole (2-5) at a middle portion of the sheet member, wherein the number of edges of the polygonal central hole (2-5) is equal to the number of the load tongues (2-2), the locations of the edges of the polygonal central hole (2-5) correspond to the locations of the load tongues (2-2), and vertexes of the polygonal central hole (2-5) are configured to be rounded corners; and manufacturing the metal sheet member into the expanding sleeve via a punching process, wherein a punching direction is a thickness direction of the sheet member. Further provided is an expanding sheet comprising a base section (2-1) and several load tongues (2-2), wherein the base section (2-1) and the load tongues (2-2) are integrally manufactured, respective load tongues (2-2) are provided with a rectangular process hole (2-4) thereon, and vertexes of the rectangular process hole (2-4) are configured to be rounded corners. A top end of a base section of the expanding sleeve has a plane shape, and a rear bolt is securely installed.

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

Images