CN210231228U

CN210231228U - Step bolt die

Info

Publication number: CN210231228U
Application number: CN201920925356.4U
Authority: CN
Inventors: Feng Liu; 刘峰
Original assignee: Chongqing Standard Fastners Industrial Co ltd
Current assignee: Chongqing Standard Fastners Industrial Co ltd
Priority date: 2019-06-19
Filing date: 2019-06-19
Publication date: 2020-04-03
Anticipated expiration: 2029-06-19

Abstract

The utility model discloses a step bolt die, belonging to the field of stamping equipment, comprising a cylindrical die sleeve, a top die, a first matrix, a chamfering die and a thread sleeve; the first die sheet and the outer wall of the threaded sleeve are in contact fit with the inner wall of the die sleeve; the end part of the first die sheet is contacted with one end of the top die, the threaded sleeve is matched with the internal thread at the opening part of the die sleeve and sequentially jacks up the top die and the first die sheet to a preset position from the other end of the top die; the chamfering die is divided into two sections, the outer wall of the chamfering die is respectively in contact fit with the top die and the first die sheet, and a die hole matched with the step bolt screw section is formed in the middle of the chamfering die. The utility model provides a step bolt mould has increased the mould life-span, has reduced the mould cost in the production process, has also indirectly improved production efficiency.

Description

Step bolt die

Technical Field

The utility model relates to a frock mould field, more specifically the theory relates to step bolt mould.

Background

The bolt head of the non-standard step bolt generally has two steps or the size of the steps does not belong to a normal range; the mold needs to be set specifically during processing. Because the impact is needed, the die is generally supported by hard alloy due to performance requirements, and the step is made of carbon steel materials, so that the corresponding manufacturing cost is high. Meanwhile, the material at the step is thin, so that the mold is easy to explode, and the mold cost is high in the production process.

SUMMERY OF THE UTILITY MODEL

To the not enough that exists among the prior art, the utility model aims to provide a step bolt mould has solved the problem that step bolt mould is with high costs among the prior art.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a step bolt die comprises a cylindrical die sleeve, a top die, a first die plate, a chamfering die and a threaded sleeve; the first die sheet and the outer wall of the threaded sleeve are in contact fit with the inner wall of the die sleeve; the end part of the first die sheet is contacted with one end of the top die, the threaded sleeve is matched with the internal thread at the opening part of the die sleeve and sequentially jacks up the top die and the first die sheet to a preset position from the other end of the top die; the outer wall of the chamfering die is respectively in contact fit with the top die and the first die piece, a die hole matched with the step bolt screw section is formed in the middle of the chamfering die, and a hole which is coaxial with the die hole and is used for the ejector rod to penetrate through is formed in the middle of the threaded sleeve.

Further, first diaphragm overcoat is equipped with the pretension cover, the external diameter of pretension cover reduces along thread bush advancing direction gradually, the internal diameter of die sleeve and pretension cover cooperation department also reduces along thread bush advancing direction gradually.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model is formed by matching the first template, the top die and the two sections of chamfering dies, and only one end of the template and one end of the chamfering die need to be replaced when the product is replaced for the bolts with the same shaft diameter; and the corresponding position is adjusted through the threaded sleeve, so that the replacement cost of the die is reduced. Meanwhile, the pretightening force is given to the outer wall of the die piece by the pretightening sleeve, the pretightening force can be adjusted by gradually changing the outer diameter in cooperation with the screw sleeve, the bearing capacity of the inner side of the die piece is increased, the service life of the die is prolonged, and the die cost in the production process is reduced. The production efficiency is also indirectly improved.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

Fig. 1 is a sectional view of the present invention;

fig. 2 is an enlarged view at a of fig. 1.

Wherein, die sleeve 1, top mould 2, thread bush 3, chamfer mould 4, first diaphragm 5, second diaphragm 6, pretension cover 7, ejector pin 8.

Detailed Description

In order to make the utility model realize that the technical means, the creation characteristics, the achievement purpose and the effect are clearer and are easy to understand, the following combination and the detailed implementation are right the utility model discloses do further explanation:

as shown in fig. 1-2, the utility model provides a step bolt die, which comprises a cylindrical die sleeve 1, a top die 2, a first die piece 5, a chamfering die 4 and a thread bush 3; the first die piece 5 and the outer wall of the threaded sleeve are in contact fit with the inner wall of the die sleeve 1; the end part of the first die sheet 5 is contacted with one end of the top die 2, the threaded sleeve 3 is matched with the internal thread at the opening part of the die sleeve 1 and sequentially jacks up the top die 2 and the first die sheet 5 to a preset position from the other end of the top die 2; the chamfering die 4 is divided into two sections, the outer wall of the chamfering die is respectively in contact fit with the top die 2 and the first die sheet 5, and a die hole matched with the step bolt screw section is formed in the middle of the chamfering die 4. And a hole which is coaxial with the die hole and is used for the ejector rod 8 to pass through is formed in the middle of the threaded sleeve 3, and after the machining is finished, the ejector rod 8 ejects a workpiece.

Further, 5 overcoat of first diaphragm is equipped with pretension cover 7, the external diameter of pretension cover 7 reduces along 3 advancing directions of thread bush gradually, the internal diameter of die sleeve 1 and the cooperation department of pretension cover 7 also reduces along 3 advancing directions of thread bush gradually, and the range of reduction is very little.

According to the above technical scheme, the utility model discloses a technical thought does: the first die piece 5 and the chamfering die 4 form a die cavity of the die, the top die 2 is matched with the die sleeve 1 to provide corresponding supporting and assembling space, and the threaded sleeve 3 is matched with the pre-tightening sleeve 7 to give pre-tightening force to the first die piece 5 so as to overcome the defect that the first die piece is fragile, so that the service life of the die piece is prolonged.

In a specific installation, for bolts with two steps, a cavity for forming a second step by a second die sheet 6 can be arranged in a first die sheet 5. Correspondingly, two sections of outer walls of the chamfering die 4 are respectively in contact fit with the inner walls of the second die sheet 6 and the top die 2. When the pretightening force is adjusted, the threaded sleeve 3 is screwed into the die sleeve 1, the top die 2 drives the pre-tightening sleeve 7 to the screwing direction, the pre-tightening sleeve 7 is made of steel with better toughness, and the steel is increasingly tightened due to the change of the matching diameter in the moving process. But fit quite well when the mold is initially assembled. The die sheet is made of a brittle and hard material with high hardness and wear resistance, and the die sheet cannot be too tight if the early warning sleeve is not matched with the die sleeve 1, otherwise the die sheet is difficult to assemble; in operation, the die sleeve 1 cannot support the die sleeve, which is one of the reasons why the conventional die is fragile during stamping.

The chamfer is directly arranged in the upper die hole of the chamfer die 4, when the chamfer is punched, the bolt chamfer is directly formed, the chamfer does not need to be additionally machined on a lathe, and the working procedure is saved. After the machining is finished, the ejector rod 8 ejects the workpiece, and the ejector rod can be driven by the air cylinder and can also be connected with the stamping rod to advance and retreat simultaneously.

Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art will understand that the present invention can be modified or replaced with other embodiments without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims

1. A step bolt die is characterized by comprising a cylindrical die sleeve, a top die, a first die sheet, a chamfering die and a threaded sleeve; the first die sheet and the outer wall of the threaded sleeve are in contact fit with the inner wall of the die sleeve; the end part of the first die sheet is contacted with one end of the top die, the threaded sleeve is matched with the internal thread at the opening part of the die sleeve and sequentially jacks up the top die and the first die sheet to a preset position from the other end of the top die; the chamfering die is divided into two sections, the outer wall of the chamfering die is in contact fit with the top die and the first die sheet respectively, and a die hole matched with the step bolt screw section is formed in the middle of the chamfering die.

2. A step bolt die as claimed in claim 1, wherein the first die is sleeved with a pre-tightening sleeve, the outer diameter of the pre-tightening sleeve is gradually reduced along the advancing direction of the threaded sleeve, and the inner diameter of the matched part of the die sleeve and the pre-tightening sleeve is also gradually reduced along the advancing direction of the threaded sleeve.

3. A step bolt mould according to claim 1 or 2, wherein a second mould sheet is further arranged on the inner side of the first mould sheet, and two sections of outer walls of the chamfer mould are respectively in contact fit with the second mould sheet and the inner wall of the top mould.