Penetrated screw nut

Abstract

The invention provides a penetrated screw nut, which comprises an outer peripheral annular bulge (2), an inner peripheral annular bulge (3) and a riveting groove (4), wherein the outer peripheral annular bulge (2) is convexly arranged on the outer periphery of the lower surface of a screw nut main body (1), the inner peripheral annular bulge (2) is convexly arranged in the center of the lower surface of the screw nut main body (1), and the riveting groove is formed between the outer peripheral annular bulge (2) and the inner peripheral annular bulge (3). A plurality of oil discharging transverse grooves (11) with the depth being 0.3 to 1.0mm are formed in the top end surface of the outer peripheral annular bulge (2), so the pressurized oil inside the riveting groove (4) is outwards discharged, and the riveting intensity is improved. When the penetrated screw nut provided by the invention is adopted, the excellent riveting intensity can be obtained even when the penetrated screw nut is arranged on a metal plate with a great amount of oil attached onto the surface.

Description

technical field [0001] The present invention relates to a penetrating nut capable of obtaining excellent riveting strength even when mounted on an oiled metal plate. Background technique [0002] A piercing nut is a nut that can be driven into a metal plate placed on a die by a punch, and simultaneously drilled and riveted. One example thereof is shown in Patent Document 1. Penetrating nuts such as figure 1 As shown, there are: an outer peripheral annular protrusion 2 protruding from the lower surface periphery of the nut main body 1; an inner peripheral annular protrusion 3 protruding from the center of the lower surface of the nut main body 1; and an annular protrusion 2 formed on the outer periphery The riveting groove 4 between the annular protrusion 3 and the inner circumference. [0003] When the piercing nut is driven into the metal plate 6 placed on the die 5 , a hole is opened by the inner peripheral annular protrusion 3 , and the metal at the peripheral portion ...

AI Technical Summary

Problems solved by technology

[0004] However, if figure 2 As shown, when a large amount of oil adheres to the surface of the metal plate 6, and when the penetrating nut is driven into the metal plate 6, the oil is sealed in the riveting groove 4 under high pressure, and the metal at the peripheral part of the hole cannot flow in. Inside of riveting groove 4

As a result, there is a problem that sufficient riveting strength cannot be obtained

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