KR20170053378A - Rotary projection welding nut - Google Patents

Rotary projection welding nut Download PDF

Info

Publication number
KR20170053378A
KR20170053378A KR1020150155816A KR20150155816A KR20170053378A KR 20170053378 A KR20170053378 A KR 20170053378A KR 1020150155816 A KR1020150155816 A KR 1020150155816A KR 20150155816 A KR20150155816 A KR 20150155816A KR 20170053378 A KR20170053378 A KR 20170053378A
Authority
KR
South Korea
Prior art keywords
coating layer
base material
projection
projection welding
welding
Prior art date
Application number
KR1020150155816A
Other languages
Korean (ko)
Inventor
김예름
윤경일
권순우
Original Assignee
현대자동차주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 현대자동차주식회사 filed Critical 현대자동차주식회사
Priority to KR1020150155816A priority Critical patent/KR20170053378A/en
Publication of KR20170053378A publication Critical patent/KR20170053378A/en

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/04—Devices for fastening nuts to surfaces, e.g. sheets, plates
    • F16B37/06—Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting
    • F16B37/061—Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting by means of welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/14—Projection welding

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

A projection welding nut according to any one of claims 1 to 3, wherein the through hole is formed in a central portion of the through hole, and the through hole has a threaded portion formed on a side surface thereof. And a plurality of protrusions spaced from each other around the bottom surface of the body and contacting the steel member layer under the coating layer while stripping the coating layer.

Description

[0001] ROTARY PROJECTION WELDING NUT [0002]

The present invention relates to a nut for rotary projection welding in which welding is improved by contacting a base material with a steel member layer by peeling a coating layer of the base material while rotating due to a shape of a protrusion formed in a lower part in a process of welding the nut to the base material.

Generally, in the case of projection welding, when the current flows under the pressure applied by the electrode part, resistance heat is generated in the projection, and the welding method in which the welding with the base material occurs due to the heat. However, in the case of a base material in which a coating layer is formed, particularly, a base material such as hot stamping steel in which a coating layer is formed by Al-Si plating, the weldability is drastically deteriorated due to such ultra high strength coating layer. As a result, welding failure of the nut occurred.

In order to overcome the deterioration of the weldability during the projection welding work on the base material such as the hot stamping steel in the related art, the welding time is increased or the amount of current is increased.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as an admission that the prior art is known to those skilled in the art.

KR 10-2004-0005136 A

The present invention provides a nut for a rotary projection welding in which welding is improved by contacting a base material with a steel member layer by peeling off a coating layer of the base material while rotating due to the shape of a protrusion formed in a lower part in a process of welding the nut to the base material .

According to an aspect of the present invention, there is provided a rotary projection welding nut according to the present invention, which is a projection welding nut that is welded to a base material on which a coating layer is formed by resistance heat generated from an electrode portion, A body formed with a thread on the side surface in the through hole; And a plurality of protrusions spaced from each other around the bottom surface of the body and contacting the steel member layer under the coating layer while peeling off the coating layer.

The protrusions are formed along the circumference of the lower surface of the body and have a predetermined thickness; And a lower blade portion that gradually becomes thinner along the predetermined direction and extends downward and the lowermost portion is in contact with the base material.

The plurality of protrusions may be formed so as to be inclined toward the outside with reference to an imaginary line extending vertically downward from the body.

The angle formed by the line formed by the lower surface of the body and the line formed by the portion extending to the lowermost portion of the projection may be in the range of 30 to 120 degrees.

The blade portion may be inclined so as to be bent in a direction in which the thickness becomes thinner.

A concavo-convex structure having a shape corresponding to the electrode portion may be formed on the upper surface of the body.

According to the nuts for rotary projection welding of the present invention as described above, since the projections have a structure in which the coating layer of the base material can be easily peeled off by rotation, the welding material can be easily welded to the base material, The effect can be expected.

As a result, the time required for the welding operation is reduced, and as a result, productivity is improved due to shortening of the process time.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a view of a rotary projection welding nut according to an embodiment of the present invention.
2 is a view showing a protrusion and a base material according to an embodiment of the present invention.
3 is a side view of a rotary projection welding nut according to an embodiment of the present invention.
4 is a view of a projection viewed from the bottom according to an embodiment of the present invention.
5 is a side view of a projection according to an embodiment of the present invention.
6 is a view illustrating a concavo-convex structure formed in a body according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

The rotary projection welding nut according to the present invention is a projection welding nut which is welded to a base material 10 on which a coating layer 11 is formed by resistance heat generated by energization from an electrode part 30, A body 100 having a through hole 110 formed therein and a threaded portion formed on an inner side surface of the through hole 110; And a plurality of protrusions 200 spaced along the bottom surface of the body 100 and contacting the steel member layer 12 under the coating layer 11 while peeling off the coating layer 11.

The body 100 with the threads formed on the inner side surfaces of the through holes 110 communicated with the upper and lower ends is a portion where the bolts are formed along the threads. Although the cross section of the body 100 is not necessarily specified, it is preferable that the cross section of the body 100 is formed in a rectangular shape having corners in terms of being rotated together with the rotation of the electrode unit 30, Do.

A projection 200 is provided on the lower surface of the body 100. The projection 200 is formed along the periphery of the body 100 to peel off the coating layer 11 of the base material 10. [ When the electrode unit 30 rotates while being downwardly coupled with the body 100 at the upper part of the body 100, the coating layer 11 of the base material 10 is peeled off by the protrusion 200 will be.

Generally, in the case of projection welding, a resistance heat is generated in the protrusion 200 when a current flows in a downward direction by the electrode unit 30, and welding with the base material 10 occurs due to such heat . However, in the case of the base material 10 in which the coating layer 11 is formed, particularly the base material 10 such as hot stamping steel in which Al-Si is plated and the coating layer 11 is formed, the weldability is drastically deteriorated due to the super high strength coating layer 11 . As a result, welding failure of the nut occurred.

In order to overcome the deterioration of the weldability, the coating layer 11 may be peeled off by the protrusion 200 so that the protrusion 200 may be formed directly on the steel member layer 12 of the base material 10 from which the coating layer 11 is peeled off Thereby improving the weldability.

The technical idea of the present invention is to remove the coating layer 11 of the base material 10 while rotating the nut due to the shape of the protrusion 200 formed at the lower part in the process of welding the nut to the base material 10, In which the weldability is improved by the contact with the steel member layer (12).

In the rotary projection welding nut according to the present invention, the projection 200 is formed along the periphery of the body 100 and has an upper fixing part 210 having a predetermined thickness; And a lower blade part 220 that gradually becomes thinner in a predetermined direction and extends downward to contact the base material 10 with the lowermost part.

The fixed portion 210 of the plurality of protrusions 200 formed along the periphery of the body 100 at a predetermined distance from the lower surface of the body 100 has a predetermined thickness. In addition, when the electrode unit 30 is rotated in the coupled state, the coating layer 11 of the base material 10 is pivoted to extend downward from the fixing unit 210 to peel off the coating layer 11, The blade portion 220 is formed.

The blade portion 220 is configured to be gradually thinned along a certain direction with respect to all the protrusions 200 so as to easily penetrate the coating layer 11 and extends downward as the thickness becomes thinner. The blade portion 220 of the protrusion 200 pierces the coating layer 11 of the base material 10 and presses the coating layer 11 of the base material 10, The contact with the portion of the steel member layer 12 occurs.

The protrusions 200 are rotated on the base material 10 in such a direction that the thickness of the protrusions 200 gradually increases with pressure being applied to the protrusions 200 by the electrode unit 30, The coating layer 220 of the base material 10 can effectively penetrate the coating layer 11.

In the rotary projection welding nut according to the present invention, the plurality of projections 200 may be formed so as to be inclined outward with respect to a hypothetical line 20 extending vertically downward from the body 100.

The fixing portion 210 and the blade portion 220 of the projection 200 are inclined outward with respect to the imaginary line 20 extending vertically downward from the body 100, 10 and the coating layer 11 crushed by the protrusion 200 is peeled off to the outer portion of the coating layer 11.

Preferably, the angle formed between the hypothetical line 20 extending vertically downward from the body 100 and the slanting line outside the protrusion 200 may be in the range of 10 to 50 degrees. If the angle is less than 10 degrees, the effect of peeling off the coating layer 11 becomes insufficient, and when the angle exceeds 50 degrees, the damage due to the pressure applied to the downward protrusion 200 where the load is concentrated The angle formed between the hypothetical line 20 extending vertically downward from the body 100 and the slant line inclined to the outside of the projection 200 is limited to a range of 10 to 50 degrees.

The angle formed by the line formed by the lower surface of the body 100 and the line formed by the portion extending from the lowermost portion of the projection 200 to the lower surface of the body 100, The coating layer 11 of the base material 10 may be more effective for digging.

If the angle is less than 30 degrees, the protrusion 200, in which the load is concentrated by the pressure applied downward, can be broken. When the angle exceeds 120 degrees, the contact portion between the protrusion 200 and the base material 10 decreases, so that a welding defect phenomenon may occur and the peeling strength to peel off the coating layer 11 of the base material 10 is decreased.

For this reason, the angle formed by the line formed by the lower surface of the body 100 and the line extending from the lower surface of the body 100 to the lowermost portion of the blade 220 is limited to a range of 30 to 120 degrees .

The length extending from the nut for rotary projection welding according to the present invention to the lowermost portion of the projection 200 may be less than 60% of the entire nut height.

If the length of the protrusion 200 extending to the lowermost space of the protrusion 200 is 60% or more of the entire nut height, the structure of the protrusion 200 where the load is concentrated becomes unstable, and when the downward pressure is applied, Because it can happen

In the rotary projection welding nut according to the present invention, the blade portion 220 may be inclined to be bent in a direction in which the thickness thereof is reduced.

The blade portion 220 is inclined to be bent in a direction in which the thickness of the blade portion 220 is reduced, so that the blade portion 220 has a hook shape when viewed from the side. As a result, the portion where the blade portion 220 of the projection 200 is in contact with the base material 10 is increased and the effect of facilitating the peeling of the coating layer 11 of the base material 10 can be expected.

In the rotary projection welding nut according to the present invention, the concave and convex structure 120 having the shape corresponding to the electrode unit 30 is formed on the upper surface of the body 100.

The concavo-convex structure 120 is formed on the upper surface of the body 100. The concavo-convex structure 120 corresponds to a shape formed at a portion of the electrode unit 30 that meets the upper surface of the body 100, And the electrode unit 30 are more firmly coupled.

Even if the electrode unit 30 rotates due to such a rigid coupling, the body 100 can rotate together with the body 100 without loosening so that the protrusion 200 can easily peel off the coating layer 11 of the base material 10 .

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be apparent to those of ordinary skill in the art.

10: Base material 11: Coating layer
12: steel member layer 30: electrode part
100: Body 110: Through hole
120: concave and convex structure 200: projection
210: fixing part 220: blade part

Claims (6)

1. A projection welding nut comprising: a base member having a coating layer formed thereon by resistance heat generated from an electrode portion,
A through hole having an upper portion and a lower portion communicated with each other at a central portion thereof; And
And a plurality of protrusions spaced from each other around the bottom surface of the body and contacting the steel member layer under the coating layer while peeling off the coating layer. The method according to claim 1,
The projection,
An upper fixing part formed along the periphery of the lower surface of the body and having a predetermined thickness; And
And a lower blade portion which is gradually thinned along a predetermined direction and extends downward to contact the lowermost portion with the base material. The method of claim 2,
Wherein the plurality of projections are formed so as to be inclined outward with respect to an imaginary line extending vertically downward from the body. The method of claim 2,
Wherein an angle formed by a line formed by the lower surface of the body and a line formed by the portion extending to the lowermost portion of the projection with respect to the side surface of the body is in the range of 30 to 120 degrees. The method of claim 2,
Wherein the blade portion is inclined so as to be bent in a direction in which the thickness thereof is thinned. The method according to claim 1,
And a concavo-convex structure having a shape corresponding to the electrode portion is formed on the upper surface of the body.
KR1020150155816A 2015-11-06 2015-11-06 Rotary projection welding nut KR20170053378A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150155816A KR20170053378A (en) 2015-11-06 2015-11-06 Rotary projection welding nut

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150155816A KR20170053378A (en) 2015-11-06 2015-11-06 Rotary projection welding nut

Publications (1)

Publication Number Publication Date
KR20170053378A true KR20170053378A (en) 2017-05-16

Family

ID=59035143

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150155816A KR20170053378A (en) 2015-11-06 2015-11-06 Rotary projection welding nut

Country Status (1)

Country Link
KR (1) KR20170053378A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111673252A (en) * 2020-05-11 2020-09-18 首钢集团有限公司 Projection welding method of nut
CN111889866A (en) * 2020-06-19 2020-11-06 西安石油大学 Friction hot riveting threaded nail and welding process

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111673252A (en) * 2020-05-11 2020-09-18 首钢集团有限公司 Projection welding method of nut
CN111889866A (en) * 2020-06-19 2020-11-06 西安石油大学 Friction hot riveting threaded nail and welding process

Similar Documents

Publication Publication Date Title
US8047740B2 (en) Friction-welded connection between a sheet metal element and a rotation body
US20150204370A1 (en) Earth bolt
TWI606188B (en) A blind rivet and a sealing structure using the same
US9091287B2 (en) Washer, screw or nut with increased coefficient of friction
KR20170053378A (en) Rotary projection welding nut
US9695853B2 (en) High energy absorption joint
CN101157158A (en) Connection for a mounting element made of steel and having a galvanic coating of aluminum with a flat component made of aluminum
JP2013529278A (en) Conductive screw connection method and special screw for this connection method
JP6096420B2 (en) Lock nut
US8894335B2 (en) Slider locknut
CN107781280A (en) The screw of belt washer
JP2014101990A (en) Grounding nut
KR101799382B1 (en) Omission basket jig unit for pulley bolts and socket-shaped bolt coating
JP2011219858A (en) Partial surface treatment apparatus
US20240191744A1 (en) Kind of bending bolt type anti-loosening nut
JP5340997B2 (en) Coating film removing bolt and manufacturing method thereof
EP3219876B1 (en) Power pylon with flange connected tubular segments
JP2016188681A5 (en)
US20150285291A1 (en) Nut
US20200246907A1 (en) Welding electrode with radial-serrated weld face and method of forming and reforming weld face
JP6173016B2 (en) Cap nut and screw-type anchor having the same
JP2015137701A (en) Fastening method and fastening structure
CN202780202U (en) Connecting device made of metallic plate member and thread insert in material locking connection with metallic plate member
US7670092B2 (en) Laminated nut with center tension sleeve
CN109958703A (en) A kind of lock washer and preparation method thereof for threaded connector

Legal Events

Date Code Title Description
A201 Request for examination
E601 Decision to refuse application