CN111014564A

CN111014564A - Chamfering forming process and die structure for middle hexagonal flange of stud bolt

Info

Publication number: CN111014564A
Application number: CN201911373479.2A
Authority: CN
Inventors: 谢向君; 伍铁忠
Original assignee: Shanghai Hongji Metal Products Co ltd
Current assignee: Shanghai Hongji Metal Products Co ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-04-17

Abstract

A process for forming a chamfer angle of a middle hexagonal flange of a stud bolt and a die structure comprise shearing a blank, binding rods at two ends and upsetting the middle; performing hexagonal and inverted conical modeling; leveling the frustum to fill the material with hexagonal shape, and forming an upper chamfer and a binding tail; leveling the hexagonal washer and simultaneously forming a chamfer on the other surface. The whole process adopts a cold heading forming scheme, reduces the waste of raw materials, saves the working procedures, reduces the production cost and simultaneously improves the performance and the quality of products.

Description

Chamfering forming process and die structure for middle hexagonal flange of stud bolt

Technical Field

The invention belongs to the technical field of metal material forming, and particularly relates to a process and a die structure for forming a chamfer of a middle hexagonal flange of a stud bolt.

Background

In the mechanical industry, various hardware parts are generally used for machining and mounting, and a fastener is a common hardware part and is a general term for a type of mechanical parts adopted when two or more parts or components are fastened and connected into a whole. Stud is a hardware component for the connection of automotive parts, which connects two different parts tightly by means of threads at both ends. The middle of the stud bolt is generally provided with a washer, and the washer is generally round or hexagonal. Take hexagonal china department stud in the tradition usually for cold forming back side cut, this kind of processing mode china department outward appearance does not have the chamfer, easily produces the side cut burr, and side cut material utilization is not high, in case the mould wearing and tearing produce harmfully such as burr, need increase temporarily to grind or artifical the selecting, increase processing cost and cost of labor. And according to the traditional technology shaping chamfer, need to increase the machining process, though the machining can guarantee not have the burr, turn out the chamfer, but increased process and circulation cycle, also can increase a lot of manufacturing cost.

Disclosure of Invention

The invention aims to provide a process and a die structure for chamfering and forming a double-head bolt middle hexagonal flange, which aim at the technical defects of the existing double-head bolt middle hexagonal flange chamfering and forming process, follow the principle of constant volume and material flow, adopt a cold heading forming scheme, reduce the waste of raw materials, save the working procedures, reduce the production cost and simultaneously improve the performance and the quality of products.

Technical scheme

In order to achieve the technical purpose, the invention provides a process for chamfering and forming a middle hexagonal flange of a stud bolt, which is characterized by comprising the following steps of:

(1) cutting the blank, and cutting the disc round wire rod one by adopting a plastic cutting principle;

(2) binding rods at two ends, and upsetting in the middle;

(3) preformed hexagonal and inverted conical forming

(4) Leveling the frustum to fill the material with hexagonal shape, and forming an upper chamfer and a binding tail;

(5) and finally, leveling the hexagonal washer, and simultaneously forming a chamfer on the other surface.

The utility model provides a hexagon flange chamfer forming die structure in middle of stud which characterized in that: the upper die part comprises an upper die and a lower die, wherein the upper die comprises an upper die, an upper sleeve is embedded in a first inner hole of the upper die, an upper sleeve sheet is sleeved on the upper sleeve and is embedded in a slotted hole of the upper die, the first inner hole is connected with the slotted hole, a cushion block is embedded in a bottom hole of the upper die, and an upper punch props against the cushion block to extend into a through hole of the upper sleeve;

the lower die part comprises a die core, the die core is embedded in an inner cavity of a die shell, a thread bush is positioned at the bottom of the die shell and locked in the inner cavity of the die shell to prop against the die core, a lower sleeve sheet is arranged in the die core, and a lower punch rod penetrates through a through hole II of the die core from a through hole I of the thread bush and extends into a guide hole of the lower sleeve sheet to correspond to the upper punch rod.

Advantageous effects

Compared with the chamfer forming process of the stud intermediate hexagonal flange in the prior art, the chamfer forming process and the die structure of the stud intermediate hexagonal flange provided by the invention have the advantages in the following aspects:

1. the washer has no sharp angle on the whole, and the two sides of the connecting and supporting surface are round, so that the assembling surface of the connected piece cannot be damaged;

2. the turning process is reduced, the period is shortened, and the material loss is reduced;

3. under the same condition, because the metal streamline at the hexagonal edge is not cut off, the strength and the toughness of the finished product washer are both superior to those of the part processed by the traditional process.

Drawings

FIG. 1 is a schematic structural diagram of a die for flattening hexagonal washers and simultaneously forming chamfers on the other side in the embodiment of the invention.

Detailed Description

The invention is further explained below with reference to the figures and examples.

Examples

The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.

The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of respective portions and their mutual relationships. It should be noted that the drawings are not necessarily drawn to the same scale in order to clearly illustrate the structures of the various elements of the embodiments of the invention. Like reference numerals are used to denote like parts. Further, when the description is made with reference to the drawings, directional words such as "upper", "lower", "front", "rear", and the like are employed for convenience of description, and they do not constitute specific limitations on the structure of the features.

The embodiment provides a process for forming a chamfer of a hexagon flange in the middle of a stud, which is characterized by comprising the following steps:

firstly, cutting blanks, cutting off the blanks one by adopting a plastic cutting principle;

secondly, binding rods at two ends and upsetting the middle;

thirdly, performing hexagonal and inverted conical forming

Fourthly, flattening the frustum to enable the material to be filled with hexagons, and forming an upper chamfer and a binding tail;

and fifthly, finally leveling the hexagonal washer and simultaneously forming a chamfer on the other surface.

As shown in the attached figure 1, the hexagon flange chamfer forming die structure in the middle of the stud is characterized in that: the stamping die comprises an upper die part and a lower die part, wherein the upper die part comprises an upper stamping die 1, an upper sleeve 2 is embedded in a first inner hole 101 of the upper stamping die 1, an upper sleeve sheet 3 is sleeved on the upper sleeve 2 and is embedded in a slotted hole 102 of the upper stamping die 1, the first inner hole 101 is connected with the slotted hole 102, a cushion block 4 is embedded in a bottom hole 103 of the upper stamping die 1, and an upper stamping rod 5 props against the cushion block 4 and extends into a through hole 201 of the upper sleeve 2;

the lower die part comprises a die core 6, the die core 6 is embedded in an inner cavity 701 of a die shell 7, a threaded sleeve 8 is positioned at the bottom of the die shell 7 and locked in the inner cavity 701 of the die shell 7 to abut against the die core 6, a lower sleeve sheet 9 is arranged in the die core 6, and a lower punch bar 10 penetrates through a through hole I801 of the threaded sleeve 8 and a through hole II 601 of the die core 6 to extend into a guide hole 901 of the lower sleeve sheet 9 to correspond to the upper punch bar 5.

The embodiment of the process for forming the chamfer of the intermediate hexagonal flange of the stud bolt and the die structure of the process are described above. The specific features such as shape, size and location of a stud medium hex flange chamfer forming process and die structure of the present invention can be specifically designed by the function of the features disclosed above, and such designs are within the reach of one skilled in the art. Moreover, the technical features disclosed above are not limited to the combinations with other features disclosed, and other combinations between the technical features can be performed by those skilled in the art according to the purpose of the invention, so as to achieve the purpose of the invention.

Claims

1. A chamfering forming process for a hexagon flange in the middle of a stud bolt is characterized by comprising the following steps:

(2) binding rods at two ends, and upsetting in the middle;

(3) preformed hexagonal and inverted conical forming

2. The utility model provides a hexagon flange chamfer forming die structure in middle of stud which characterized in that:

the stamping die comprises an upper die part and a lower die part, wherein the upper die part comprises an upper stamping die (1), an upper sleeve (2) is embedded in a first inner hole (101) of the upper stamping die (1), an upper sleeve sheet (3) is sleeved on the upper sleeve (2) and is embedded in a slotted hole (102) of the upper stamping die (1), the first inner hole (101) is connected with the slotted hole (102), a cushion block (4) is embedded in a bottom hole (103) of the upper stamping die (1), and an upper stamping rod (5) props against the cushion block (4) and extends into a through hole (201) of the upper sleeve (2);

the lower die part comprises a die core (6), the die core (6) is embedded in an inner cavity (701) of a die shell (7), a threaded sleeve (8) is positioned at the bottom of the die shell (7) and locked in the inner cavity (701) of the die shell (7) to abut against the die core (6), a lower sleeve sheet (9) is arranged in the die core (6), and a lower punching rod (10) penetrates through a second through hole (601) of the die core (6) from a first through hole (801) of the threaded sleeve (8) to extend into a guide hole (901) of the lower sleeve sheet (9) to correspond to the upper punching rod (5).