CN201730926U

CN201730926U - Projection welding nut

Info

Publication number: CN201730926U
Application number: CN2010200497882U
Authority: CN
Inventors: 陆志伟; 刘红
Original assignee: ZHEJIANG MOTORBACS AUTOPARTS CO Ltd
Current assignee: ZHEJIANG MOTORBACS TECHNOLOGY CO., LTD.
Priority date: 2010-01-12
Filing date: 2010-01-12
Publication date: 2011-02-02
Anticipated expiration: 2020-01-12

Abstract

A projection welding nut comprises a nut body, wherein a threaded hole is formed on the nut body along the axial direction, a square body with the bottom thereof flush with the bottom end of the threaded hole is formed in the circumferential direction of the nut body, and the four corners of the square body are downwardly protruded to form welding bumps for welding the nut on the end surface of a flange threaded hole. The projection welding nut is characterized in that the bottom end of the threaded hole is downwardly extended to form a convex neck which is fit to the size of the flange threaded hole, and the convex neck passes through the threaded hole and is spaced with the welding bumps. Compared with the prior art, the convex neck is additionally arranged at the center of the welding surface of the standard projection welding nut in the prior art, and during welding, and the threaded hole of the projection welding nut is spaced with the welding bumps by the convex neck, so as to effective prevent the welding slag generated when the projection welding nut is melted with the flange from splashing into the threaded hole of the projection welding nut and avoid the blockage of the screws of the projection welding nut.

Description

A kind of project-welding nut

Technical field

The utility model relates to a kind of nut, particularly relates to a kind of project-welding nut that is used for automobile exhaust manifold screw type flange.

Background technique

On the general automobile exhaust manifold two flanges (specially referring to screw shape flange here) are arranged, one is to be used for exporting the four hole flanges (four cylinders are represented in four holes) that are connected with engine cylinder-body, and another is the single hole flange that is used to be connected on the outlet end that flow into next link (three-element catalytic part or baffler part) after each arm collection gas gathers.

Usually, screw type four hole flanges will cooperate fixing by screw and nut, and flange plate offers screw in a position that only needs screw to pass, and are welded with the project-welding nut of M8 or M6 as the upper lateral part of screw, be used for the thermal shield assembling and connect, project-welding nut welding back is concentric with the screw of flange; Screw type single hole flange also will be fixed by screw and nut, being used for thermal shield assembling connection is connected with back segment outlet pipe single hole flange, generally the project-welding nut (corresponding with the nut specification of four hole flanges) with M6 or M10 * 1.25 is welded on the screw of flange, vehicle according to the different designs structure, the support that is connected with cylinder body that has also is connected above the single hole flange, and generally the project-welding nut with M8 or M10 * 1.25 is welded to above the screw of flange.

During actual the use, project-welding nut is generally selected the NBS part for use, as shown in Figure 1, bulge loop nut structure schematic representation for prior art, this project-welding nut include nut body 1 ' and be distributed in four salient points 2 of nut body 1 ' periphery ', the alternating-current resistance spot welding machine is adopted in the welding of project-welding nut and flange usually, setting electric current, voltage, after the parameter such as pressure and time, flange screw is located by insulated dowel, project-welding nut is placed on above the locating stud, four salient points and the flange of project-welding nut are welded together, draw the supplemental characteristic of correct welding by torsion experiment and load test stabilization again after the welding.According to the project-welding nut of said welding method and flange when the welding, because under high temperature and certain pressure effect, can produce spark when the salient point of project-welding nut and four hole flange mother metal weldings, the welding slag particle that these sparks form is easy to enter in the screw thread of nut, cause nut to stop up to have some setbacks and make product do over again, also can cause product rejection when serious.

In sum, when existing NBS project-welding nut and flange plate adopted the alternating-current resistance welding, the welding slag that produces during welding was easy to stop up the screw thread of project-welding nut, makes the quality of flange plate to be guaranteed, and also brings certain trouble to quality control.

Summary of the invention

Technical problem to be solved in the utility model is that splash project-welding nut in the screw thread that enters nut of a kind of welding slag that can prevent effectively that when nut and flange carry out the alternating-current resistance welding welding from producing is provided at above-mentioned prior art present situation.

The utility model solves the problems of the technologies described above the technological scheme that is adopted: this project-welding nut, include nut body, this nut body offers tapped hole vertically, and, circumferential formation one bottom of described nut body and the concordant tetragonal body in bottom of described tapped hole, four corners of this tetragonal body are protruded downwards respectively and are formed for being welded to pedestal on the flange tapped hole end face, it is characterized in that: the bottom of described tapped hole extend downwards and form one can with the suitable protruding neck of described flange tapped hole size, this protruding neck and described tapped hole connect and are provided with at interval with described pedestal.

In order can be better to cooperate with the screw of flange plate, as preferably, described protruding neck thickness range radially is 1.2mm～1.5mm.

As further preferred, the little 0.3mm～0.5mm of the degree of depth of the described flange tapped hole of described protruding neck aspect ratio vertically.

Further preferred again, the gap between described protruding neck and the described flange tapped hole is≤0.10mm.

Compared with prior art, advantage of the present utility model is: increase by a protruding neck in the face of weld center of original standard piece project-welding nut, this protruding neck extend downwards from the bottom of tapped hole and and nut body one-body molded, when welding, the protruding neck of project-welding nut can be extend in the tapped hole of flange, just separated between the tapped hole of project-welding nut and the pedestal by protruding neck, the welding slag that produces in the time of can preventing project-welding nut and flange welding effectively splashes and enters in the tapped hole of bulge loop nut, avoids causing the screw thread of project-welding nut to stop up.

Description of drawings

Fig. 1 is the project-welding nut perspective view of prior art.

Fig. 2 is a bulge loop nut perspective view of the present utility model.

Fig. 3 is the sectional view of bulge loop nut shown in Figure 2.

Fig. 4 is the worm's eye view of bulge loop nut shown in Figure 2.

Fig. 5 is the user mode figure of the utility model bulge loop nut.

Fig. 6 is the sectional arrangement drawing of the utility model bulge loop nut.

Embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

As Fig. 2～shown in Figure 4, project-welding nut structural representation and user mode figure for present embodiment, this project-welding nut 1 includes nut body 11, nut body 1 offers tapped hole 111 vertically, and, the concordant tetragonal body 12 in bottom of circumferential formation one bottom of nut body 11 and tapped hole, four corners of this tetragonal body 12 are protruded downwards respectively and are formed for being welded to pedestal 121 on the flange tapped hole end face, the bottom of tapped hole 111 extends one and the protruding neck 13 that connects of this tapped hole 111 downwards, protruding neck 13 is positioned at the center of project-welding nut face of weld and with the tapped hole 111 of pedestal 121 and nut body 11 separately, the screw thread of tapped hole 111 extends in the protruding neck 13.

As Fig. 5, shown in Figure 6, project-welding nut user mode figure for present embodiment, the project-welding nut 1 of present embodiment is welded on the flange plate 2 of gas exhaust manifold, this flange plate 2 have two vertical with the chassis and be positioned at the wing plate 21 of the same side, offer screw 211 on the wing plate 21, being used for the thermal shield assembling connects, project-welding nut 1 is fixing by the edge welding at pedestal 121 and screw 211 tops, protruding neck 13 thickness range radially of project-welding nut 1 is for increasing 1.2mm～1.5mm, the little 0.3mm～0.5mm of screw 211 degree of depth of protruding neck 13 aspect ratio flange plate 2 vertically again on the thread depth basis of tapped hole 111; The screw 211 of flange plate 2 will guarantee roughness and circularity, and the cooperation between protruding neck 13 and the flange screw 211 is a Spielpassung, in order to guarantee the position degree of screw 211, being set to≤0.10mm between protruding neck 13 and the screw 211.

During welding, protruding neck 13 with project-welding nut 1 inserts in the screw 211 of flange plate 2 earlier, again flange plate 2 and project-welding nut 1 integral body are placed on above the locating stud, enable switch, make full and uniform stressed of the upper surface of project-welding nut 1, pedestal 121 weldings of project-welding nut 1 are in the screw 211 of flange plate 2; And then take off flange plate 2 and project-welding nut, because the buffer action of protruding neck 13, the welding slag that four pedestals 121 of project-welding nut 1 are produced when welding splashes in the tapped hole 111 that can't enter project-welding nut 1, the tapped hole that guarantees project-welding nut can not stop up because of welding slag, improve the welding effect of project-welding nut effectively, improved the quality of product.

Claims

1. project-welding nut, include nut body, this nut body offers tapped hole vertically, and, circumferential formation one bottom of described nut body and the concordant tetragonal body in bottom of described tapped hole, four corners of this tetragonal body are protruded downwards respectively and are formed for being welded to pedestal on the flange tapped hole end face, it is characterized in that: the bottom of described tapped hole extend downwards and form one can with the suitable protruding neck of described flange tapped hole size, this protruding neck and described tapped hole connect and are provided with at interval with described pedestal.

2. project-welding nut according to claim 1 is characterized in that: described protruding neck thickness range radially is 1.2mm～1.5mm.

3. project-welding nut according to claim 1 is characterized in that: the little 0.3mm～0.5mm of the degree of depth of the described flange tapped hole of described protruding neck aspect ratio vertically.

4. project-welding nut according to claim 1 is characterized in that: the gap between described protruding neck and the described flange tapped hole is≤0.10mm.