CN201225357Y

CN201225357Y - Square head-shaped full thread hollow bolt

Info

Publication number: CN201225357Y
Application number: CN 200820121211
Authority: CN
Inventors: 陆颂荫
Original assignee: Ningbo Donggang Fastener Manufacturing Co Ltd
Current assignee: Ningbo Donggang Fastener Manufacturing Co Ltd
Priority date: 2008-07-10
Filing date: 2008-07-10
Publication date: 2009-04-22
Anticipated expiration: 2018-07-10

Abstract

The utility model discloses a square-head screw hollow stay bolt which comprises a bolt body, wherein the bolt body is provided with a rod body and a tail end body of a connecting body, the head end of the rod body is radially provided with a concave convex slotted thread body, and the effective length of the thread body is at least equal to the diameter of the rod body; the axial center of the bolt body is provided with at least one seamless tubular cavity body formed by cold heading, and the tubular cavity body passes through the axial ends of the tail end body of the rod body; the axes of the bolt body is provided with a circular hole cavity, the weight of the integral bolt is lightened, and the weight of relative assembled objects is effectively reduced; the axes of the bolt body is provided with the circular hole cavity body, the rigidity of the bolt is effectively improved and the crimped section internal stress of the bolt is increased under the condition that the strength of the integral structure is kept same; the axes of the bolt body is provided with the circular hole cavity body, the resource is saved when the weight is lightened; the axes of the bolt body is provided with the circular hole cavity body, the problem of poor penetrability of axes heat treatment is solved, and the heat treatment effect of the bolt body is improved.

Description

Square toes shape Full Thread FT hollow bolt

Technical field

The utility model relates to the technical field of fastening piece in the five metals element, particularly a kind of square toes shape Full Thread FT hollow bolt.

Background technique

General bolt fastener traditionally mostly is the solid body structure, also use widely than tool, but the whole relatively weight of the bolt arrangement of solid body is bigger, and big weight directly can cause the raising of cost, is unfavorable for the saving of resource; Also have big weight also can bring the increase of being joined object weight; The solid body structure is when heat treatment, and the permeability in axle center is relatively poor.

But also having the bolt of half special-purpose hollow structure in the society, is Chinese utility model patent " the sleeve bolt " (notification number: CN2612832Y) this type of design is arranged of ZL03229829.3 as number of patent application; Profile is the beer ampuliform, and top is screwed screw rod, and the bottom is the hollow sleeve of hole enlargement, and the sleeve circumference has 3-5 groove that is used to weld along the sleeve generatrix direction.The special bolt in special use occasion is mainly considered in this design, does not have and the general function of present society's circulation bolt, so do not have the possibility of batch process; And this structure only relates to the part hollow structure, and hollow design is not carried out in the double thread attachment portion yet, so use on the performance of section the structure with present solid bolt identical at screw thread, do not have bigger difference.

Summary of the invention

Technical problem to be solved in the utility model is the present situation at prior art, provide a kind of rational in infrastructure, in light weight, rigidity is effective, the crimped section internal stress reaches the good square toes shape Full Thread FT hollow bolt of thermal effectiveness by force.

The utility model solves the problems of the technologies described above the technological scheme that is adopted: square toes shape Full Thread FT hollow bolt, comprise bolt body, this bolt body has the bar portion body and the tail end body of disjunctor, bar portion body head end radially is shaped on the threaded body of shaggy tooth groove shape, and the effective length of this threaded body equals the diameter value of bar portion body at least; The bolt body axial centre is shaped at least one seamless tubular shaped die cavity body through cold upset forming, and this die cavity body runs through the axle head of bar portion body and tail end body.

The measure of taking also comprises:

Above-mentioned bolt body is the structure of square toes shape, and the tail end body that this structure is shaped on is cubic body, and the front end of tail end body is a bar portion body; The die cavity body that the square toes structure is shaped on is a circular hole body, and the shaft core position of this circular hole body side of being positioned at above-mentioned bar portion body.

The above-mentioned circular hole body and the axial end of tail end body are shaped on the chamfering rib; The threaded body length that above-mentioned bar portion system has extends the whole length of this bar portion body.

Compared with prior art, the utility model comprises bolt body, this bolt body has the bar portion body and the tail end body of disjunctor, and bar portion body head end radially is shaped on the threaded body of shaggy tooth groove shape, and the effective length of this threaded body equals the diameter value of bar portion body at least; The bolt body axial centre is shaped at least one seamless tubular shaped die cavity body through cold upset forming, and this die cavity body runs through the axle head of bar portion body and tail end body.Advantage of the present utility model is: at bolt body axle center preparation circular hole cavity, and whole bolt weight saving, and then reduced the weight that relevant institute is equipped with object effectively; At bolt body axle center preparation circular hole cavity, under the situation that overall construction intensity remains unchanged, improve the rigidity of bolt part effectively, strengthened the crimped section internal stress of bolt part; At bolt body axle center preparation circular hole cavity, in weight saving, also realized the saving of whole resource; At bolt body axle center preparation circular hole cavity, solved the relatively poor problem of axle center heat treatment permeability, improved the thermal effectiveness of the body of bolt.

Description of drawings

Fig. 1 is whole section worm structure schematic three dimensional views in the utility model embodiment's the square toes shape bolt body;

Fig. 1 a is that the master of Fig. 1 looks schematic representation;

Fig. 1 b is that schematic representation is looked on the left side of Fig. 1;

Fig. 1 c is that schematic representation is looked on the right side of Fig. 1;

Fig. 1 d is the schematic top plan view of Fig. 1;

Fig. 1 e is the elevational schematic view of Fig. 1;

Fig. 1 f is the schematic rear view of Fig. 1;

Fig. 1 g is the schematic representation that turns to of Fig. 1.

Embodiment

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

The utility model embodiment, square toes shape Full Thread FT hollow bolt comprises bolt body, and this bolt body has the bar portion body and the tail end body of disjunctor, bar portion body head end radially is shaped on the threaded body of shaggy tooth groove shape, and the effective length of this threaded body equals the diameter value of bar portion body at least; The bolt body axial centre is shaped at least one seamless tubular shaped die cavity body through cold upset forming, and this die cavity body runs through the axle head of bar portion body and tail end body.

Present embodiment is achieved in that the utility model embodiment shown in Fig. 1 to Fig. 1 g, and bolt body is the structure 13 of square toes shape, and the tail end body 13a that this structure 13 is shaped on is cubic body, and the front end of tail end body 13a is the body 13c of bar portion; The die cavity body that square toes structure 13 is shaped on is a circular hole body 13b, and this circular hole body 13b is positioned at the shaft core position of the body 13c of square bar portion.The axial end of circular hole body 13b and tail end body 13a is shaped on chamfering rib 13f; The threaded body 13e length that the body 13c of bar portion is shaped on extends the whole length of the body 13c of this bar portion.

Advantage of the present utility model is: at bolt body axle center preparation circular hole cavity, and whole bolt weight saving, and then reduced the weight that relevant institute is equipped with object effectively; At bolt body axle center preparation circular hole cavity, under the situation that overall construction intensity remains unchanged, improve the rigidity of bolt part effectively, strengthened the crimped section internal stress of bolt part; At bolt body axle center preparation circular hole cavity, in weight saving, also realized the saving of whole resource; At bolt body axle center preparation circular hole cavity, solved the relatively poor problem of axle center heat treatment permeability, improved the thermal effectiveness of the body of bolt.

Most preferred embodiment of the present utility model is illustrated, and various variations or the remodeling made by those of ordinary skills can not break away from scope of the present utility model.

Claims

1, square toes shape Full Thread FT hollow bolt, comprise bolt body, described bolt body has the bar portion body and the tail end body of disjunctor, and described bar portion body head end radially is shaped on the threaded body of shaggy tooth groove shape, and the effective length of this threaded body equals the diameter value of bar portion body at least; It is characterized in that: described bolt body axial centre is shaped at least one seamless tubular shaped die cavity body through cold upset forming, and this die cavity body runs through the axle head of bar portion body and tail end body.

2, square toes shape Full Thread FT hollow bolt according to claim 1, it is characterized in that: described bolt body is the structure (13) of square toes shape, the tail end body (13a) that this structure (13) is shaped on is cubic body, and the front end of described tail end body (13a) is a bar portion body (13c); The die cavity body that described square toes structure (13) is shaped on is a circular hole body (13b), and the shaft core position of this circular hole body (13b) side of being positioned at described bar portion body (13c).

3, square toes shape Full Thread FT hollow bolt according to claim 2 is characterized in that: described circular hole body (13b) is shaped on chamfering rib (13f) with the axial end of tail end body (13a); Threaded body (13e) length that described bar portion's body (13c) is shaped on extends the whole length of this bar portion body (13c).