Nut integrated with bracket and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-2020291981-A1
Application number	US-202016885694-A
Country	US
Kind code	A1
Filing date	May 28, 2020
Priority date	Dec 14, 2016
Publication date	Sep 17, 2020
Grant date	—

Abstract

A method of manufacturing a nut integrated with a bracket forms the nut formed integrally with the bracket or a slab base nut by using a plate material supplied between a punch and a die. The slab base nut includes a base plate and a boss extending from the base plate and including female-threads. The base plate and the boss are integrated into a single piece without welding trace.

First claim

1 - 14 . (canceled)

15 . A nut integrated with a bracket, wherein the nut, which has a threaded tap processed on an inner circumferential surface of a pipe portion and is formed integrally with an increased thickness portion that protrudes at an outer circumference of a tip of the pipe portion, is formed integrally with the bracket, by a method of manufacturing the nut integrated with the bracket, which forms the nut formed integrally with the bracket by using a plate material supplied between a punch and a die,
wherein the method comprises:
a pre-drawing step of forming a reference hole and a processing cross section in the plate material supplied between the punch and the die, forming a beading portion by processing the processing cross section through multiple steps, and piercing a center of the beading portion;
a forging step of forming a pipe portion having a tube shape by gradually widening a through hole in the beading portion and decreasing a diameter of the pipe portion from the processing cross section to a tip of the beading portion, and then processing an outer circumferential surface of the pipe portion so as to form the tube shape through multiple steps so that a thickness is increased from the tip of the pipe portion to the processing cross section, subsequent to the pre-drawing step;
a precision forging step of precisely correcting dimensions of an inner diameter and an outer diameter of the pipe portion formed in the tube shape, forming a shape protruding from the tip of the pipe portion, and then compressing the pipe portion in order to remove residual burrs on a surface thereof, subsequent to the forging step; and
a post-processing step of cutting the processing cross section to a final product shape, and then forming bent ends at both end portions of the cut processing cross section, and a threaded tap on an inner circumferential surface of the pipe portion, subsequent to the precision forging step.

16 . The nut integrated with the bracket of claim 15 , wherein:
the pipe portion is formed at a center of the rectangular bracket, and the bracket is formed by forming bent ends at both end portions of the bracket.

17 . The nut integrated with the bracket of claim 16 , wherein:
the bent ends are formed by bending both end portions of the bracket, which have a long length, at an angle of 90° at a predetermined radius of curvature toward the pipe portion.

18 . A nut integrated with a bracket, wherein the nut, which has a thread processed on an inner circumferential surface of a pipe portion and is formed integrally with an increased thickness portion that protrudes at an outer circumference of a tip of the pipe portion and a protruding end that protrudes in a longitudinal direction on a tip surface of the increased thickness portion, is formed integrally with the bracket, by a method of manufacturing the nut integrated with the bracket, which forms the nut formed integrally with the bracket by using a plate material supplied between a punch and a die,
wherein the method comprises:
a pre-drawing step of forming a reference hole and a processing cross section in the plate material supplied between the punch and the die, forming a beading portion by processing the processing cross section through multiple steps, and piercing a center of the beading portion;
a forging step of forming a pipe portion having a tube shape by gradually widening a through hole in the beading portion and decreasing a diameter of the pipe portion from the processing cross section to a tip of the beading portion, and then processing an outer circumferential surface of the pipe portion so as to form the tube shape through multiple steps so that a thickness is increased from the tip of the pipe portion to the processing cross section, subsequent to the pre-drawing step;
a precision forging step of precisely correcting dimensions of an inner diameter and an outer diameter of the pipe portion formed in the tube shape, forming a shape protruding from the tip of the pipe portion, and then compressing the pipe portion in order to remove residual burrs on a surface thereof, subsequent to the forging step; and
a post-processing step of cutting the processing cross section to a final product shape, and then forming bent ends at both end portions of the cut processing cross section, and a threaded tap on an inner circumferential surface of the pipe portion, subsequent to the precision forging step.

19 . The nut integrated with the bracket of claim 18 , wherein:
the pipe portion is formed at a center of the rectangular bracket, and the bracket is formed by forming bent ends at both end portions of the bracket.

20 . The nut integrated with the bracket of claim 18 , wherein:
the bent ends are formed by bending both end portions of the bracket, which have a long length, at an angle of 90° at a predetermined radius of curvature toward the pipe portion.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp
• Protech Korea Co Ltd
• Sungwoo Hitech Co Ltd

Inventors

• Lee Heui Bom
• Lee Dongjin
• Jung Juncheul
• Yun Jeong Rok
• Lee Mun Yong
• Ryu Sin Ho
• Lee Sang Lae

Classifications

• F16B37/04

  Devices for fastening nuts to surfaces, e.g. sheets, plates {(nuts fastened behind a wall by a toggle-mechanism F16B13/0808; threaded inserts F16B37/122; measures against loss of bolts, nuts or pins F16B41/002)} · CPC title

• B21D31/02

  Stabbing or piercing, e.g. for making sieves (dimpling B21D22/04; perforating by punching B21D28/24) · CPC title

• B21D28/02

  Punching blanks or articles with or without obtaining scrap (cutting nails or pins from strips or sheet material B21G3/26); Notching · CPC title

• F16B37/02

  made of thin sheet material (fastening to surfaces F16B37/04 {; used as lock-nuts F16B39/14}) · CPC title

• B21H3/08

  internal screw-threads · CPC title