CN210648321U

CN210648321U - Hot forging die for inner hexagon bolt

Info

Publication number: CN210648321U
Application number: CN201921310439.9U
Authority: CN
Inventors: 苏友份; 周世团; 黄平贵; 胡正平; 吴承涛
Original assignee: Zhejiang Dite High Intension Bolt Co ltd
Current assignee: Zhejiang Dite High Intension Bolt Co ltd
Priority date: 2019-08-13
Filing date: 2019-08-13
Publication date: 2020-06-02
Anticipated expiration: 2029-08-13

Abstract

The utility model discloses an inner hexagonal bolt hot forging mould, including last mould and lower mould, the up end of lower mould inlays and is equipped with the die, be provided with the fashioned shaping groove that the opening upwards is used for the bolt head shaping on the die, it is provided with the endotheca to go up the mould, it slides from top to bottom to correspond shaping groove central point in the endotheca is provided with the hexagonal towards the stick, the lateral wall circumference equipartition in shaping groove has a plurality of recesses that are used for forming the knurling line along axial extension. The utility model provides a form knurling pattern in bolt head plastic deformation, not only can simplify hexagon socket head cap screw's manufacturing procedure, improve production efficiency, the knurling line that plastic deformation formed is more even moreover.

Description

Hot forging die for inner hexagon bolt

Technical Field

The utility model belongs to the technical field of the forge hot mould, especially, hexagon socket head cap screw forge hot mould.

Background

The socket head cap screw comprises a screw rod and a screw head arranged at one end of the screw rod, wherein the screw head is formed by forging and pressing a hot forging die basically, the hot forging die in the prior art comprises an upper die for stamping and a lower die for forming the screw head, a screw rod positioning sleeve for positioning the screw rod and a die plate for forming the screw head are arranged in the lower die, a blank to be forged is firstly placed in the lower die, and the upper die applies pressure to the blank to enable the screw head to generate plastic deformation in the die plate. However, in order to meet some use requirements, knurling patterns are arranged on the side wall of the bolt head of the conventional hexagon socket head bolt, and the knurling patterns are formed by machining through a lathe, so that the machining process of the hexagon socket head bolt is complicated and the efficiency is low.

SUMMERY OF THE UTILITY MODEL

In order to overcome the not enough of prior art, the utility model provides a form knurling line in bolt head plastic deformation, not only can simplify hexagon socket head cap screw's manufacturing procedure, improve production efficiency, the knurling line that plastic deformation formed is more even moreover.

In order to realize the purpose, the utility model discloses a technical scheme is: the utility model provides an inner hexagonal bolt hot forging mould, includes mould and lower mould, the up end of lower mould inlays and is equipped with the die, be provided with the opening on the die and upwards be used for the fashioned shaping groove of bolt head, it is provided with the endotheca to go up the mould, it slides from top to bottom to correspond shaping groove central point in the endotheca is provided with the hexagonal towards the stick, the lateral wall circumference equipartition in shaping groove has a plurality of recesses that are used for forming the knurling along axial extension.

Adopt above-mentioned scheme, exert pressure to the blank through last mould, thereby make the blank can take place plastic deformation at the shaping inslot of diaphragm and form the bolt head, through set up a plurality of recesses that are used for forming the knurling pattern in the shaping inslot can make when the bolt head is at the shaping process, can form the knurling pattern simultaneously on the lateral wall, do not need rethread lathe to process, the manufacturing procedure of hexagon socket head cap screw has been simplified, the production efficiency is improved, and because the recess that sets up at the shaping inslot lateral wall is evenly distributed, consequently, make the knurling line that forms more even. The utility model discloses simple structure, processing is convenient, makes the line of knurling more even when simplifying manufacturing procedure.

As the utility model discloses a further setting, the lower mould is provided with the screw rod position sleeve of establishing terminal surface under the die to supporting, be formed with the chamber of exhausting in the position of screw rod position sleeve and die butt in the lower mould, the chamber of exhausting radially outwards extends has a plurality of exhaust holes, the lower terminal surface of die is provided with a plurality of air current channel that are used for intercommunication shaping groove and exhaust chamber.

Adopt above-mentioned scheme, because the forging and pressing in-process need be cooled off to being turned on the water to the work piece of being processed usually, because the cooling in-process normal water is heated and can produce a large amount of steam, the steam of production can be full of in the shaping groove usually, be formed with the exhaust chamber in the position of screw rod position sleeve and die butt in the bed die, make steam can get into the exhaust chamber from the shaping groove through airflow channel, prevent that the steam of production from causing the influence to the formation of annular knurl, make the annular knurl form more evenly plump, make can fully agree with the recess when the blank is pressed, in addition can reduce the mould through the steam discharge of exhaust hole with the exhaust chamber and take place the possibility of fracture, the service life of.

As a further setting of the utility model, the lower terminal surface of diaphragm is provided with the three airflow channel who is the circumference equipartition.

By adopting the scheme, steam in the forming groove rapidly enters the exhaust cavity through the uniformly distributed airflow channels.

As a further arrangement of the present invention, the die is in the shape of a circular truncated cone, and the diameter of the die toward the upper die one end is smaller than the diameter of the other end.

By adopting the scheme, the circular truncated cone-shaped die piece can not generate upward displacement or upward separation due to vibration when being pressed under stress, and the stability of the processing process is improved.

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

Drawings

FIG. 1 is a schematic structural view of an upper mold in an embodiment of the present invention;

FIG. 2 is a schematic structural view of a lower mold according to an embodiment of the present invention;

FIG. 3 is an enlarged view of portion A of FIG. 2;

FIG. 4 is an enlarged view of portion B of FIG. 2;

FIG. 5 is a top view of a mold piece in an embodiment of the present invention;

FIG. 6 is a schematic structural view of the material punching and forming process according to the embodiment of the present invention;

fig. 7 is an enlarged view of portion C of fig. 6.

Detailed Description

The specific embodiment of the utility model is shown in figures 1-7, a hot forging die for inner hexagon bolts, which comprises an upper die 1 and a lower die 2, a mold sheet 21 is embedded on the upper end surface of the lower die 2, a molding groove 211 with an upward opening for molding a bolt head is arranged on the mold sheet 21, an inner sleeve 11 and a die cover 12 are arranged in the upper die 1, a hexagonal punch 13 is arranged in the inner sleeve 11 in a way of sliding up and down corresponding to the central position of the forming groove 211, the hexagonal punch 13 is arranged in a T shape, a cushion block 14 is arranged at the transverse end of the hexagonal punch 13, the cushion block 14 can be used for abutting against the die cover 12 to prevent the punch rod from being excessively lifted in the inner sleeve 11 and play a role of buffering and protecting the punch rod at the same time, which is beneficial to improving the processing efficiency, the side wall of the forming groove 211 is uniformly provided with a plurality of axially extending grooves 2111 for forming a knurl pattern.

In this embodiment, the lower mold 2 is provided with a screw positioning sleeve 22 abutting against the lower end face of the mold sheet 21, an exhaust cavity 23 is formed in the lower mold 2 at a position where the screw positioning sleeve 22 abuts against the mold sheet 21, the exhaust cavity 23 radially and outwardly extends to form a plurality of exhaust holes 231, and the lower end face of the mold sheet 21 is provided with a plurality of airflow channels 212 for communicating the molding groove 211 with the exhaust cavity 23.

The lower terminal surface of diaphragm 21 is provided with three airflow channel 212 that is circumference equipartition, airflow channel 212's width is 2cm, and the degree of depth is 0.2 cm.

Die 21 is the round platform form, die 21 is less than the diameter of the other end towards the diameter of last mould 1 one end, die 21's hypotenuse inclination is 5~7 degrees, and this embodiment is preferred 5 degrees, can provide better package and power, and die 21 is more firm in the 2 interior positioning of lower mould.

In this embodiment, be provided with drift 131 at the vertical end tip of hexagonal plunger 13, can be in advance through the characters such as laser pre-engraved product model or trade mark on the terminal surface of drift 131 for hexagonal plunger 13 can form characters such as model or trade mark in the inner wall of hexagonal including when the punching press forms the hexagon socket, can simplify the manufacturing procedure of hexagon socket head cap screw to a certain extent.

The utility model discloses do not confine the above-mentioned embodiment to, the general technical personnel in this field can adopt other multiple embodiments to implement according to the utility model discloses a, perhaps all adopt the utility model discloses a design structure and thinking do simple change or change, all fall into the utility model discloses a protection scope.

Claims

1. The utility model provides a hexagon socket head cap screw hot forging mould, includes mould and lower mould, the up end of lower mould inlays and is equipped with the die, be provided with the opening on the die and upwards be used for the fashioned shaping groove of bolt head, it is provided with the endotheca to go up the mould, it slides from top to bottom to correspond shaping groove central point in the endotheca and is provided with hexagonal towards stick, its characterized in that: and a plurality of grooves which extend along the axial direction and are used for forming knurling patterns are uniformly distributed on the side wall of the forming groove in the circumferential direction.

2. A hexagon socket head cap screw hot forging die as claimed in claim 1, wherein: the lower mould is provided with the screw rod position sleeve of establishing terminal surface under the diaphragm of support, be formed with the chamber of exhausting in the position of screw rod position sleeve and diaphragm butt in the lower mould, the chamber of exhausting radially outwards extends has a plurality of exhaust holes, the lower terminal surface of diaphragm is provided with a plurality of air current passageways that are used for intercommunication shaping groove and exhaust chamber.

3. A hexagon socket head cap screw hot forging die as claimed in claim 2, wherein: the lower end face of the die piece is provided with three airflow channels which are circumferentially and uniformly distributed.

4. A hexagon socket head cap screw hot forging die as claimed in claim 1, 2 or 3, wherein: the die piece is in a round table shape, and the diameter of one end, facing the upper die, of the die piece is smaller than that of the other end of the die piece.