CN216566693U

CN216566693U - Stop bolt

Info

Publication number: CN216566693U
Application number: CN202122995621.6U
Authority: CN
Inventors: 汪斌; 戴星; 夏贤科
Original assignee: ZHEJIANG YUTAI AUTO PARTS CO Ltd
Current assignee: ZHEJIANG YUTAI AUTO PARTS CO Ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-05-20
Anticipated expiration: 2031-11-30

Abstract

A stop bolt comprises a bolt body, wherein a flange part is arranged on the bolt body and divides the bolt body into a square-head thick rod part and a screw rod part, the square-head thick rod part comprises a thick rod part and a square head part, the square head part is a square block formed by protruding the central position of one side, away from the flange part, of the thick rod part, the outer diameter of the thick rod part is larger than that of the square head part, the outer diameter of the thick rod part is smaller than that of the flange part, the problems of incomplete filling and distortion can be solved through trimming an outer flange, and the product precision is improved; the square forming part adopts a machining-free process, and the square forming and the petal forming are completed at one time through the customized trimming die, so that the processing cost and the material loss can be effectively reduced, the production efficiency can be improved, and the like.

Description

Stop bolt

Technical Field

The invention relates to the technical field of bolt processes, in particular to a stop bolt.

Background

The existing bolt forming process is difficult to form at one time by adopting cold heading due to the special shapes of the flange, the thick rod and the hexagon, and mainly shows that the flange is not fully formed, the size precision is low, and the parts such as four directions and the like need to be machined, so that the manufacturing cost of the product is increased, and the production efficiency of the product is influenced.

Disclosure of Invention

In view of this, the invention provides a retarder for a chassis dynamometer.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a stop bolt, includes the bolt body, set up flange portion on the bolt body, flange portion separates the bolt body for thick pole portion of square head and screw rod portion, the thick pole portion of square head includes thick pole portion and square head portion, the square head portion is the square that the central point that flange portion one side was kept away from to thick pole portion puts the protrusion and forms, the external diameter of thick pole portion is less than flange portion.

Preferably, the flange portion is arranged on one side, close to the thick rod portion, of the bolt body, the flange portion is arranged in a stepped structure, the flange portion comprises a first flange portion and a second flange portion, the outer diameter of the first flange portion is larger than that of the second flange portion, and the second flange portion is arranged on one side, far away from the thick rod portion, of the first flange portion.

Preferably, the periphery of one side of the thick rod part close to the square head part is protruded to form a plurality of petal parts, one side of the petal parts close to the flange part is arranged in an arc structure, and one side of the petal parts far away from the flange part is arranged in a plane structure.

Preferably, the peripheries of the petal parts are on the same ring, the outer diameter of the ring where the peripheries of the petal parts are located is smaller than that of the flange part, and the inner sides of the petal parts are in intersecting connection or coplanar connection with the inner sides of the adjacent petal parts.

Preferably, a transfer interlayer is formed among the petal part, the thick rod part and the flange part and used for accommodating a transfer object, and the upper position and the lower position of the transfer object in the transfer interlayer are limited by the petal part and the flange part.

The invention has the beneficial effects that: the problems of incomplete filling and distortion can be solved through trimming the outer flange, and the product precision is improved; the square forming part adopts a machining-free process, square forming and petal forming are completed at one time through the customized trimming die, the processing cost and the material loss can be effectively reduced, the production efficiency can be improved, the product processing precision can be improved, the material consumption can be reduced, the energy consumption can be reduced, and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of steps S1-S5 of the present invention;

FIG. 3 is a schematic perspective view of the present invention;

FIG. 4 is another angle structure diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention will be further described with reference to the accompanying drawings.

The invention provides the following technical scheme:

as shown in fig. 1-4, the invention discloses a stop bolt, which comprises a bolt body 1, wherein a flange part 2 is arranged on the bolt body 1, the flange part 2 divides the bolt body 1 into a square-head thick rod part 3 and a screw rod part 4, the square-head thick rod part 3 comprises a thick rod part 5 and a square head part 6, the square head part 5 is a square block formed by protruding the center position of one side, far away from the flange part 2, of the square-head thick rod part 3, the outer diameter of the thick rod part 5 is larger than that of the square head part 5, and the outer diameter of the thick rod part 5 is smaller than that of the flange part 2. Specifically, the square head 5 has four main planes 11, and chamfering processing is performed between the four main planes 11.

Further, flange portion 2 is the setting of echelonment structure, flange portion 2 includes first flange portion 7 and second flange portion 8, the external diameter of first flange portion 7 is greater than the external diameter of second flange portion 8, and is specific, second flange portion 8 sets up in one side that thick pole portion 5 was kept away from to first flange portion 7. Specifically, the flange part 2 is arranged, so that the ratio of the supporting area to the stress area of the bolt body 1 is larger than that of a common bolt, and the bolt body 1 in the design can bear higher pretightening force and has better anti-loosening performance; and flange portion 2 is the setting of echelonment structure, forms first flange portion 7 and second flange portion 8, and the flange portion 2 of echelonment structure can strengthen bolt body 1 and the contact surface area of installation object after the installation to increase the stability that bolt body 1 and object are connected.

Furthermore, the periphery of one side of the thick rod part 5 close to the square head part 6 is protruded to form a plurality of petal parts 9, one side of the petal parts 9 close to the flange part 2 is in an arc-shaped structure, and one side of the petal parts 9 far away from the flange part 2 is in a plane structure. Specifically, in this embodiment, each petal 9 does not have the interval setting, and during concrete implementation, can set up the interval between each petal portion 9, and the interval is the equidistance setting, and the setting of interval can block the part and change the outfit, realizes the effect of locking, prevents further rotation bolt. Specifically, the peripheries of the petal parts 9 are on the same circular ring, the outer diameter of the circular ring where the peripheries of the petal parts 9 are located is smaller than the outer diameter of the flange part 2, the inner sides of the petal parts 9 are in intersecting connection or coplanar connection with the inner sides of the adjacent petal parts 9, namely, no space exists between the two adjacent petal parts 9, and two adjacent side surfaces of the two adjacent petal parts 9 have intersecting points or surfaces, in the design, the petal parts 9 are in intersecting connection; or coplanar connection, namely that the side surface of one petal part 9 in a plurality of petal parts is in the same plane with the side surface of the adjacent petal part 9.

Furthermore, a transfer interlayer 10 is formed among the petal part 9, the thick rod part 5 and the flange part 2. Specifically, a locking relation is formed by the relation of the square head part 6, the thick rod part 5 and the flange part 2, so that the assembly nut accessories can be prevented from sliding, a transfer interlayer 10 capable of accommodating transfer objects is formed among the petal parts 9, the thick rod part 5 and the flange part 2, the transfer interlayer 10 is used for accommodating transfer objects (not shown in the figure), the upper and lower positions of the transfer objects in the transfer interlayer 10 are limited by the petal parts 9 and the flange part 2, particularly, the transfer interlayer 10 is formed between the petal parts 9 and the first flange part 7, so that the first flange part 7 and the petal parts 9 become limiting structures arranged at two ends of the transfer interlayer 10, the movement of the transfer objects extending into the transfer interlayer 10 in the direction along the thick rod part 5 is limited, the transfer objects are fixed, and the movement of the transfer objects in the rotation process of the transfer objects is avoided, causing difficulty in screwing or unscrewing the bolt body.

A cold heading forming process of a stop bolt comprises the following steps:

s1: cutting, namely preparing a blank, cutting the blank, and then forming a screw body through forced necking, wherein in the step, the blank is placed in a strong shrinkage die to be subjected to primary cold heading, the primary cold heading is carried out for 84s under the pressure of 2t at normal temperature, and the blank in the strong shrinkage die is subjected to strong shrinkage treatment to obtain a blank;

s2: the method comprises the following steps of firstly upsetting a head part, machining a square head part 6 of a bolt by adopting 30t pressure at normal temperature during the initial upsetting, continuously forming a screw rod part 4 to form a chamfer on the screw rod part 4, and specifically, carrying out secondary cold upsetting treatment on the blank to enable the blank to form the screw rod part 4 and carrying out chamfer pretreatment on the end part of the screw rod part 4 in the step;

s3: forming a first flange part 7 and a second flange part 8 on the thick rod part by using a cold header, processing and forming the second flange part 8 in a die, naturally forming the first flange part 7 outside the die, and finishing the short ending of the screw thread and the cylinder of the screw rod part 4 in the die;

s4: finishing the square head part 6 and the petal part 9 by adopting an edge cutting process; the allowable tolerance for trimming was 0.05. mu.m, and the roughness was 6.3 μm

S5: and the outer flange is subjected to edge cutting treatment by adopting secondary edge cutting to meet the requirement of drawing size, the allowable tolerance of the outer flange is 0.1 mu m, and the roughness of the outer flange is 6.3 mu m.

Further, the first flange part in the step S3 is formed outside the mold, and the first flange part is naturally formed outside the mold. Specifically, second flange portion 8 shaping in the mould, first flange portion 7 is the natural shaping outside the mould, can guarantee like this that second flange portion 8 shaping is full to first flange portion 7 can the shaping true circle, and the structure is full, adopts the natural shaping outside the mould, and step S4 is cut edge the outer flange and can be solved by full and distortion problem in addition, improves the product precision.

Further, the square head portion and the petal portion 9 in step S4 are formed at a time by a trimming die. Specifically, a machining-free process is adopted in the forming part of the square head part 6, the forming of the square head part 6 and the forming of the petal part are completed at one time through the customized trimming die, the processing cost and the material loss can be effectively reduced, the production efficiency is improved, the processing precision of a product can be improved, the production efficiency is improved, the consumption of materials can be reduced, the loss of energy sources is reduced, and the like.

Specifically, in the forming process, the cold header adopts a CBF five-station cold header to perform cold header forming on the bolt, and the cold header can sequentially realize the working procedures of material cutting, heading, accumulation, forming, chamfering, reducing, edge cutting and the like. The bar stock is actively fed into the required length by the feeding mechanism, is blocked into a blank by the blocking and blocking mechanism, and is then sequentially fed to the stacking and pressing station and the punching station by the clamp conveying mechanism for forming.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A stop bolt, characterized by: including the bolt body, set up flange portion on the bolt body, flange portion separates the bolt body for thick pole portion of square head and screw rod portion, the thick pole portion of square head includes thick pole portion and square head portion, the square head portion puts the square that the protrusion formed for the central point that thick pole portion kept away from flange portion one side, the external diameter of thick pole portion is less than flange portion.

2. A stop bolt according to claim 1, wherein: the flange portion sets up the one side that is close to thick pole portion at the bolt body, flange portion is the echelonment structure setting, flange portion includes first flange portion and second flange portion, the external diameter of first flange portion is greater than the external diameter of second flange portion, second flange portion sets up the one side of keeping away from thick pole portion at first flange portion.

3. A stop bolt according to claim 1, wherein: the thick rod part is close to one side periphery protrusion formation a plurality of petal portions of square head, the petal portion is close to one side of flange portion and is the setting of cambered surface shape structure, the petal portion is kept away from one side of flange portion and is the planar structure setting.

4. A stop bolt according to claim 3, wherein: the periphery of the petal portion is on same ring, and the external diameter of the ring that petal portion periphery was located is less than the external diameter of flange portion, the inboard crossing connection or the coplane connection of the inboard of petal portion and adjacent thereof.

5. A stop bolt according to claim 3, wherein: form between petal portion, thick pole portion and the flange portion and change to join in marriage the intermediate layer, change to join in marriage the intermediate layer and be used for holding and change to join in marriage the object, just petal portion and flange portion carry on spacingly to the upper and lower position of joining in marriage the object in the intermediate layer of joining in marriage.