CN114273600A - Square-neck bolt, forming die and forming process - Google Patents
Square-neck bolt, forming die and forming process Download PDFInfo
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- CN114273600A CN114273600A CN202210014689.8A CN202210014689A CN114273600A CN 114273600 A CN114273600 A CN 114273600A CN 202210014689 A CN202210014689 A CN 202210014689A CN 114273600 A CN114273600 A CN 114273600A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000010008 shearing Methods 0.000 claims abstract description 50
- 239000000463 material Substances 0.000 claims abstract description 29
- 238000007493 shaping process Methods 0.000 claims description 46
- 238000004080 punching Methods 0.000 claims description 18
- 238000009966 trimming Methods 0.000 claims description 15
- 238000001125 extrusion Methods 0.000 claims description 9
- 230000007704 transition Effects 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 4
- 235000001674 Agaricus brunnescens Nutrition 0.000 claims description 3
- 238000009415 formwork Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000003672 processing method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 101100008044 Caenorhabditis elegans cut-1 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010273 cold forging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009416 shuttering Methods 0.000 description 1
- 238000007514 turning Methods 0.000 description 1
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Abstract
The invention discloses a square neck bolt, a forming die and a forming process thereof, belongs to the technical field of bolt processing, and comprises a square neck part, wherein one end of the square neck part is fixedly connected with the center of a head part, the other end of the square neck part is fixedly connected with the top end of a first rod part, the tail end of the first rod part is fixedly connected with the top end of a second rod part, the square neck part extends in a square column shape, the outer diameter of the square neck part is larger than the outer diameter of the first rod part, the outer diameter of the first rod part is larger than the outer diameter of the second rod part, and the square neck bolt forming die comprises a material shearing station, a first station, a second station, a third station and a fourth station which are sequentially arranged.
Description
Technical Field
The invention belongs to the technical field of bolt processing, and particularly relates to a square-neck bolt, a forming die and a forming process.
Background
The traditional processing method of the square-neck bolt is to extrude the square neck by extrusion while forming the head pan head in the production process, so that the square-neck bolt is manufactured. The square neck bolt produced by the processing method has full square neck and collapse at opposite angles, is easy to slip when being assembled with a hand piece, cannot meet the mounting method of large torque, and the square neck mold in the cold forging mold of the processing method bears huge transverse stress and simultaneously bears longitudinal force, is easy to explode, reduces the service life of the mold, and causes high production cost and low efficiency and greatly reduces the product quality.
Disclosure of Invention
The invention aims to provide a square-neck bolt, a forming die and a forming process, which aim to overcome the defects of the prior art and have the advantages of edge cutting, no recess on the neck and high precision in the cold heading process.
In order to realize the technical purpose, the square neck bolt, the forming die and the forming process thereof adopt the technical scheme that:
the utility model provides a square neck bolt, includes the square neck, square neck one end and head center fixed connection, the other end and first pole portion top fixed connection, first pole portion end and second pole portion top fixed connection, the square neck is the square column and extends, and its external diameter is greater than first pole portion external diameter, first pole portion external diameter is greater than second pole portion external diameter.
Preferably, the edge of the square neck is in arc transition, and arc transition lines are carved on the surface of the edge.
Preferably, the first rod part and the second rod part are both reducing rod bodies and comprise large-diameter ends and small-diameter ends, and the length of each large-diameter end is greater than that of each small-diameter end.
A square neck bolt forming die comprises a material shearing station, a first station, a second station, a third station and a fourth station which are arranged in sequence;
the material shearing station comprises an inner shearing die for shearing materials, an outer shearing die and a machine station material stopping device for controlling the material shearing length, wherein a shaft center hole matched with the periphery of the materials is formed in the middle of the outer shearing die, the shaft center hole extends into the inner shearing die, a cushion table is abutted to the bottom of the shaft center hole, and a support column transversely arranged along the inner shearing die is arranged at the bottom of the cushion table;
the first station comprises a first stamping die and a first main die which are matched, a cavity is formed in the end portion of the first stamping die, an ejector rod which is tightly attached to the cavity wall is arranged in the cavity, the end portion of the ejector rod is connected with a stamping rod, the stamping rod penetrates through the cavity and then extends into a stamping die cushion block which is arranged at the other end portion of the first stamping die, a head notch with a trapezoidal cross section is formed in the bottom of the stamping rod, the head notch is used for pre-stamping a blank to form a thick mushroom head, a first main die cushion block is arranged in the first main die, a first shaping port of a first rod portion of a thick-stamping bolt is formed in the end portion of the first main die cushion block, a first main die ejector pin with the tail end extending into the first cushion die is abutted to the bottom of the first shaping port, the first cushion die and the first main die are connected into a whole in an end-to-end mode, and the first main die ejector pin extends to the outside along the inside of the first cushion die;
the second station comprises a second punching die and a second main die which are matched, the second punching die comprises a second punching die shell, a second punching die core is arranged at the end part of the inner cavity of the second punching die shell, an arc-shaped notch for upsetting the end part of the blank into an arc shape is formed in the end surface of the second punching die core, the second main die comprises a second main die shell, the second main die and a second cushion die are sequentially arranged in the second main die shell, a second main die cushion block is arranged at the end part of the second main die, a second shaping opening of a second rod part of the thick pier bolt is arranged in the second main die cushion block, the bottom of the second shaping opening is provided with a second main die ejector pin which penetrates through the second main die and the second cushion die to the outside, the end part of the second shaping opening is flush with the second main mold shell, circular mold sheets embedded in the second main mold shell are oppositely arranged on two sides of the second shaping opening, and the circular mold sheets are flush with the end part of the second main mold shell;
the third station comprises a third stamping die and a third main die which are matched, the third stamping die comprises a third stamping die shell, a third stamping die core is arranged at the end part of an inner cavity of the third stamping die shell, a micro-arc notch for forming a head flash is formed in the end face of the third stamping die core, the third main die comprises a third main die shell, a third main die and a third cushion die are sequentially arranged in the third main die shell, a third main die cushion block is arranged at the end part of the third main die, a third shaping port for shearing a square neck and a second rod port is formed in the third main die cushion block, a third main die ejector pin penetrating through the third main die and the third cushion die to the outside is arranged at the bottom of the third shaping port, a square die sheet for shearing a bolt neck is arranged at the end part of the third shaping port, the square die is embedded in the third main die shell, and the end part of the square die is level with the third main die shell;
the quadruplex position is including matched with fourth die and fourth fundamental mode, the fourth die includes the fourth die shell that dashes, fourth die shell inner chamber one end is equipped with round trimming die, and the discharge gate has been seted up to the other end, round trimming die middle part is equipped with the reducing feed inlet, the fourth fundamental mode includes the fourth fundamental mode shell, inside side cut top die and the fourth pad mould of being equipped with in proper order of fourth fundamental mode shell, the material mouth of putting that is used for placing the thick bolt is offered to side cut top die tip, it is equipped with the fourth fundamental mode thimble that runs through side cut top die and fourth pad mould to the outside to put the material mouth bottom.
Preferably, a station is used for pier blank head and pole portion, two stations are used for plastic head and extrusion to generate first pole portion, three stations are used for shaping head overlap, cut four directions neck corner and extrusion and generate second pole portion, four stations are used for cutting edge and the ejection of compact to the head.
Preferably, the station operation is carried out among the first station, the second station, the third station and the fourth station through the blank operation clamp.
Preferably, the front end of the ejector pin of the fourth main die tightly abuts against the tail end of the blank, and the tail end of the ejector pin of the fourth main die is provided with an air pressure device for driving the ejector pin to move towards the trimming ejector die.
Preferably, the pneumatic device is further disposed at the end of the first main mold thimble, the end of the second main mold thimble, and the end of the third main mold thimble, respectively.
Preferably, the bottom of the support column is fixedly connected with the bottom of the internal shearing die after the diameter of the bottom of the support column is changed.
A square neck bolt forming process comprises the following steps:
a. preparing a blank, wherein the diameter of the blank is the same as that of the head of the bolt, and the length of the blank is equal to the sum of the lengths of the head, the square neck, the first rod part and the second rod part of the bolt;
b. one end of the blank is placed into the axis hole, the other end of the blank is abutted against the end part of the machine stop device, and a shearing knife on the external shearing die shears the blank to ensure that the blank meets the length requirement;
c. the blank is moved into a first shaping port through a running clamp, a first stamping die and a first main die are in a die closing state, a first main die ejector pin pushes the blank to move towards the first stamping die after being impacted by an air pressure device, and the mushroom-shaped head and the rod part of the stud are upset;
d. after rough upsetting, the blank is moved into a second shaping port, a second die and a second main die are in a die closing state, and a second main die ejector pin pushes the blank to move towards the second die after being impacted by an air pressure device, so that the head of the blank is upset into an arc-shaped head and a first rod;
e. then, the blank is moved to a third shaping opening, the third stamping die and the third main die are in a die closing state, an ejector pin of the third main die pushes the blank to move towards the third stamping die after being impacted by an air pressure device, meanwhile, the rear end of the head part is cut into a square shape by the square die sheet, the tail end of the blank is extruded into a second rod part by the third shaping opening, and the front end of the head part is extruded with a flash by the micro-arc notch;
f. and (3) the blank is moved into the material placing port, the fourth die and the fourth main die are in a die closing state, the ejector pin of the fourth main die pushes the blank to move towards the die core after being impacted by the air pressure device, the flash is quickly removed, and the formed square bolt is discharged from the discharge port.
Compared with the prior art, the invention has the beneficial effects that:
1. in the invention, the forming of the square neck and the forming of the tail end of the second rod part are integrated into a third shaping opening in three stations, namely, the edge of the square neck is cut in the whole process of the cold heading bolt, so that the stress condition of a square neck stamping die is improved, the square neck stamping die is only stressed longitudinally and is within the range of the rigidity of the die, and the service life of the die is prolonged;
2. the neck of the bolt is square, and is subjected to trimming forming, so that compared with the conventional extrusion forming, the problem that the full square neck is collapsed is avoided, and the requirement that the bolt is installed under high torque and does not slip is met;
3. according to the invention, the mode of machining the bolt by using the cold pier in cooperation with shearing is adopted, so that the bolt is not deformed in the machining and forming process, the bolt precision is ensured, and meanwhile, the machining defect caused by conventional turning is avoided.
Drawings
FIG. 1 is a front view of the square neck bolt of the present invention;
FIG. 2 is a top view of the square neck bolt of the present invention;
FIG. 3 is a schematic structural view of a shearing station in the square neck bolt forming mold according to the present invention;
FIG. 4 is a schematic structural view of a station in the square neck bolt forming mold according to the present invention;
FIG. 5 is a schematic structural view of two stations in the square neck bolt forming mold according to the present invention;
FIG. 6 is a schematic structural view of three stations in the square neck bolt forming mold according to the present invention;
FIG. 7 is a schematic structural view of four stations in the square neck bolt forming mold according to the present invention;
FIG. 8 is a schematic view of the process of forming the square neck bolt of the present invention.
In the figure: 1. a square neck; 2. a head portion; 3. a first rod portion; 4. a second rod portion; 5. a shearing station; 6. a station; 7. a second station; 8. three stations; 9. four stations;
501. an internal shearing die; 502. an external shearing die; 503. a machine station material blocking device; 504. a shaft center hole; 505. a cushion table; 506. supporting columns;
601. a first die; 602. a first master mold; 603. a top rod; 604. punching a rod; 605. punching a cushion block; 606. a head slot; 607. a first main mold cushion block; 608. a first shaping port; 609. a first cushion mold; 610. a first main mold thimble;
701. a second die shell; 702. a second punching die core; 703. an arc-shaped notch; 704. a second main formwork; 705. a second master mold; 706. a second cushion mold; 707. a second main die cushion block; 708. a second shaping port; 709. a second main mold thimble; 710. a circular mold sheet;
801. a third die shell punching; 802. a third punching die core; 803. a micro-arc notch; 804. a third main formwork; 805. a third main mold; 806. a third cushion mold; 807. a third main die cushion block; 808. a third shaping port; 809. a third main die thimble; 810. a square matrix;
901. a third die shell punching; 902. circular trimming die; 903. a discharge port; 904. a variable diameter feed inlet; 905. a fourth main formwork; 906. trimming and ejecting the die; 907. a fourth cushion mold; 908. a material placing port; 909. and a fourth main die thimble.
Detailed Description
The invention will be further described with reference to the following drawings and detailed description:
as shown in fig. 1-2, a square neck bolt includes a square neck 1, one end of the square neck 1 is fixedly connected to the center of a head 2, the other end of the square neck is fixedly connected to the top end of a first rod 3, the end of the first rod 3 is fixedly connected to the top end of a second rod 4, the square neck 1 extends in a square column shape, the outer diameter of the square neck is greater than the outer diameter of the first rod 3, and the outer diameter of the first rod 3 is greater than the outer diameter of the second rod 4.
The edge of the square neck 1 is in arc transition, and arc transition lines are carved on the surface of the square neck.
As shown in fig. 3-8, a square neck bolt forming die comprises a material shearing station 5, a first station 6, a second station 7, a third station 8 and a fourth station 9 which are arranged in sequence;
the material shearing station 5 comprises an inner shearing die 501 and an outer shearing die 502 for shearing materials and a machine stopping device 503 for controlling the shearing length of the materials, wherein the middle part of the outer shearing die 502 is provided with an axial hole 504 matched with the periphery of the materials, the axial hole 504 extends into the inner shearing die 501, the bottom of the axial hole 504 is abutted with a cushion table 505, the bottom of the cushion table 505 is provided with a support column 506 transversely arranged along the inner shearing die 501, and the bottom of the support column 506 is fixedly connected with the bottom of the inner shearing die 501 after being reduced in diameter;
the station 6 comprises a first die 601 and a first main die 602 which are matched, a cavity is opened at the end part of the first die 601, a top rod 603 tightly attached to the cavity wall is arranged in the cavity, the end of the top rod 603 is connected with a punch 604, the punch 604 extends through the chamber and into a die pad 605 at the other end of the first die 601, the bottom of the punch rod 604 is provided with a head notch 606 with a trapezoidal section, the head notch 606 is used for pre-upsetting a blank to form a head of a coarse mushroom, a first main die cushion block 607 is arranged in the first main die 602, a first shaping port 608 of the first rod part 3 of the thick pier bolt is arranged at the end part of the first main die cushion block 607, the bottom of the first shaping opening 608 is abutted with a first main mold ejector pin 610 with a terminal end extending into a first cushion mold 609, the first cushion mold 609 and the first main mold 602 are connected end to form a whole, and the first main mold ejector pin 610 extends to the outside along the inside of the first cushion mold 609;
the second station 7 comprises a second die and a second main die which are matched, the second die comprises a second die shell 701, a second die core 702 is arranged at the end part of an inner cavity of the second die shell 701, an arc-shaped notch 703 for upsetting the end part of the blank into an arc shape is formed in the end surface of the second die core 702, the second main die comprises a second main die shell 704, a second main die 705 and a second cushion die 706 are sequentially arranged in the second main die shell 704, a second main die cushion block 707 is arranged at the end part of the second main die 705, a second shaping port 708 of a thick pier bolt second rod part 4 is formed in the second main die cushion block 707, a second main die ejector pin 709 penetrating through the second main die 705 and the second cushion die 706 to the outside is arranged at the bottom of the second shaping port 708, the end part of the second shaping port 708 is level with the second main die shell 704, and circular shapes 710 embedded in the second main die shell 704 are oppositely arranged at two sides of the second shaping port 708, the circular mold sheet 710 is flush with the end of the second main mold casing 704;
the third station 8 comprises a third die and a third main die which are matched, the third die comprises a third die shell 801, a third die core 802 is arranged at the end part of an inner cavity of the third die shell 801, a micro-arc notch 803 for forming a head flash is formed in the end surface of the third die core 802, the third main die comprises a third main die shell 804, a third main die 805 and a third cushion die 806 are sequentially arranged in the third main die shell 804, a third main die cushion block 807 is arranged at the end part of the third main die 805, a third shaping port 808 for shearing a second rod part 4 port of the fourth neck part 1 is formed in the third main die cushion block 807, a third main die ejector pin 809 penetrating through the third main die 805 and the third cushion die 806 to the outside is arranged at the bottom part of the third shaping port 808, a fourth die 810 for shearing the neck part of a bolt is arranged at the end part of the third shaping port 808, and the fourth die 810 is embedded in the third main die shell 804, and the end part is level with the third main shuttering 804;
the four-station 9 comprises a fourth die and a fourth main die which are matched, the fourth die comprises a fourth die shell 901, one end of the inner cavity of the fourth die shell 901 is provided with a circular trimming die 902, the other end of the inner cavity of the fourth die shell is provided with a discharge hole 903, the middle of the circular trimming die 902 is provided with a variable-diameter feed port 904, the fourth main die comprises a fourth main die shell 905, a trimming top die 906 and a fourth cushion die 907 are sequentially arranged in the fourth main die shell 905, the end part of the trimming top die 906 is provided with a material placing port 908 for placing a coarse bolt, and the bottom of the material placing port 908 is provided with a fourth main die thimble 909 penetrating through the trimming top die 906 and the fourth cushion die 907 to the outside.
In the bolt cold heading forming process, the square neck is sheared by the square matrix, namely, the cold heading process and the shearing process are combined, so that the die is only subjected to longitudinal force in the square neck forming process without being restrained by transverse force, the whole stress is within the rigidity range of the die, the loss of the die is reduced, the service life of the die is prolonged, and meanwhile, the shearing process is adopted, the fullness of the square neck of the bolt is ensured, the problem that the neck is sunken in the extrusion process is avoided, and the forming quality of the bolt is improved.
A station 6 is used for pier blank head 2 and pole portion, two stations 7 are used for plastic head 2 and extrusion to generate first pole portion 3, three stations 8 are used for 2 overlap of shaping head, cut 1 corner of four directions neck and extrusion and generate second pole portion 4, quadruplex position 9 is used for cutting edge and the ejection of compact to head 2, carry out the station operation through blank operation clip between 6, two stations 7, three stations 8 and the quadruplex position 9. The blank operation clamp (not shown in the figures) is conventional technology and will not be described herein.
The front end of the fourth main mold thimble 909 is tightly abutted against the end of the blank, the end of the fourth main mold thimble 909 is provided with an air pressure device for driving the fourth main mold thimble to move towards the trimming top mold 906, and the air pressure devices are further respectively arranged at the end of the first main mold thimble 610, the end of the second main mold thimble 709 and the end of the third main mold thimble 809. The pneumatic device is in the prior art and is used for pushing the ejector pins of each main die to advance.
A square neck bolt forming process comprises the following steps:
a. preparing a blank, wherein the diameter of the blank is the same as that of the head of the bolt, and the length of the blank is equal to the sum of the lengths of the head, the square neck, the first rod part and the second rod part of the bolt;
b. one end of the blank is placed into the axis hole, the other end of the blank is abutted against the end part of the machine stop device, and a shearing knife on the external shearing die shears the blank to ensure that the blank meets the length requirement;
c. the blank is moved into a first shaping port through a running clamp, a first stamping die and a first main die are in a die closing state, a first main die ejector pin pushes the blank to move towards the first stamping die after being impacted by an air pressure device, and the mushroom-shaped head and the rod part of the stud are upset;
d. after rough upsetting, the blank is moved into a second shaping port, a second die and a second main die are in a die closing state, and a second main die ejector pin pushes the blank to move towards the second die after being impacted by an air pressure device, so that the head of the blank is upset into an arc-shaped head and a first rod;
e. then, the blank is moved to a third shaping opening, the third stamping die and the third main die are in a die closing state, an ejector pin of the third main die pushes the blank to move towards the third stamping die after being impacted by an air pressure device, meanwhile, the rear end of the head part is cut into a square shape by the square die sheet, the tail end of the blank is extruded into a second rod part by the third shaping opening, and the front end of the head part is extruded with a flash by the micro-arc notch;
f. and (3) the blank is moved into the material placing port, the fourth die and the fourth main die are in a die closing state, the ejector pin of the fourth main die pushes the blank to move towards the die core after being impacted by the air pressure device, the flash is quickly removed, and the formed square bolt is discharged from the discharge port.
Therefore, the invention is not to be limited to the specific embodiments, but rather, all equivalent changes and modifications in the shapes, structures, characteristics and spirit of the invention are intended to be included within the scope of the appended claims.
Claims (10)
1. A square neck bolt which is characterized in that: including the square neck, square neck one end and head center fixed connection, the other end and first pole portion top fixed connection, first pole portion end and second pole portion top fixed connection, the square neck is the square column and extends, and its external diameter is greater than first pole portion external diameter, first pole portion external diameter is greater than second pole portion external diameter.
2. The lag bolt of claim 1, wherein: the edge of the square neck is in arc transition, and arc transition lines are carved on the surface of the square neck.
3. The lag bolt of claim 1, wherein: the first rod part and the second rod part are variable diameter rod bodies and comprise large-diameter ends and small-diameter ends, and the length of each large-diameter end is greater than that of each small-diameter end.
4. A square neck bolt forming die comprises a material shearing station, a first station, a second station, a third station and a fourth station which are arranged in sequence;
the material shearing station comprises an inner shearing die for shearing materials, an outer shearing die and a machine station material stopping device for controlling the material shearing length, wherein a shaft center hole matched with the periphery of the materials is formed in the middle of the outer shearing die, the shaft center hole extends into the inner shearing die, a cushion table is abutted to the bottom of the shaft center hole, and a support column transversely arranged along the inner shearing die is arranged at the bottom of the cushion table;
the first station comprises a first stamping die and a first main die which are matched, a cavity is formed in the end portion of the first stamping die, an ejector rod which is tightly attached to the cavity wall is arranged in the cavity, the end portion of the ejector rod is connected with a stamping rod, the stamping rod penetrates through the cavity and then extends into a stamping die cushion block which is arranged at the other end portion of the first stamping die, a head notch with a trapezoidal cross section is formed in the bottom of the stamping rod, the head notch is used for pre-stamping a blank to form a thick mushroom head, a first main die cushion block is arranged in the first main die, a first shaping port of a first rod portion of a thick-stamping bolt is formed in the end portion of the first main die cushion block, a first main die ejector pin with the tail end extending into the first cushion die is abutted to the bottom of the first shaping port, the first cushion die and the first main die are connected into a whole in an end-to-end mode, and the first main die ejector pin extends to the outside along the inside of the first cushion die;
the second station comprises a second punching die and a second main die which are matched, the second punching die comprises a second punching die shell, a second punching die core is arranged at the end part of the inner cavity of the second punching die shell, an arc-shaped notch for upsetting the end part of the blank into an arc shape is formed in the end surface of the second punching die core, the second main die comprises a second main die shell, the second main die and a second cushion die are sequentially arranged in the second main die shell, a second main die cushion block is arranged at the end part of the second main die, a second shaping opening of a second rod part of the thick pier bolt is arranged in the second main die cushion block, the bottom of the second shaping opening is provided with a second main die ejector pin which penetrates through the second main die and the second cushion die to the outside, the end part of the second shaping opening is flush with the second main mold shell, circular mold sheets embedded in the second main mold shell are oppositely arranged on two sides of the second shaping opening, and the circular mold sheets are flush with the end part of the second main mold shell;
the third station comprises a third stamping die and a third main die which are matched, the third stamping die comprises a third stamping die shell, a third stamping die core is arranged at the end part of an inner cavity of the third stamping die shell, a micro-arc notch for forming a head flash is formed in the end face of the third stamping die core, the third main die comprises a third main die shell, a third main die and a third cushion die are sequentially arranged in the third main die shell, a third main die cushion block is arranged at the end part of the third main die, a third shaping port for shearing a square neck and a second rod port is formed in the third main die cushion block, a third main die ejector pin penetrating through the third main die and the third cushion die to the outside is arranged at the bottom of the third shaping port, a square die sheet for shearing a bolt neck is arranged at the end part of the third shaping port, the square die is embedded in the third main die shell, and the end part of the square die is level with the third main die shell;
the quadruplex position is including matched with fourth die and fourth fundamental mode, the fourth die includes the fourth die shell that dashes, fourth die shell inner chamber one end is equipped with round trimming die, and the discharge gate has been seted up to the other end, round trimming die middle part is equipped with the reducing feed inlet, the fourth fundamental mode includes the fourth fundamental mode shell, inside side cut top die and the fourth pad mould of being equipped with in proper order of fourth fundamental mode shell, the material mouth of putting that is used for placing the thick bolt is offered to side cut top die tip, it is equipped with the fourth fundamental mode thimble that runs through side cut top die and fourth pad mould to the outside to put the material mouth bottom.
5. The square neck bolt forming die of claim 4, wherein: a station is used for thick mound blank head and pole portion, two stations are used for plastic head and extrusion to generate first pole portion, three stations are used for shaping head overlap, cut four directions neck corner and extrusion and generate second pole portion, the quadruplex position is used for cutting edge and the ejection of compact to the head.
6. The square neck bolt forming die of claim 5, wherein: and the first station, the second station, the third station and the fourth station are operated by the blank operation clamp.
7. The square neck bolt forming die of claim 4, wherein: the front end of the ejector pin of the fourth main die tightly abuts against the tail end of the blank, and the tail end of the ejector pin of the fourth main die is provided with an air pressure device for driving the ejector pin to move towards the trimming ejector die.
8. The square neck bolt forming die of claim 7, wherein: the air pressure devices are further respectively arranged at the tail end of the first main mold thimble, the tail end of the second main mold thimble and the tail end of the third main mold thimble.
9. The square neck bolt forming die of claim 1, wherein: and the bottom of the support column is fixedly connected with the bottom of the internal shearing die after the diameter is changed.
10. A square neck bolt forming process comprises the following steps:
a. preparing a blank, wherein the diameter of the blank is the same as that of the head of the bolt, and the length of the blank is equal to the sum of the lengths of the head, the square neck, the first rod part and the second rod part of the bolt;
b. one end of the blank is placed into the axis hole, the other end of the blank is abutted against the end part of the machine stop device, and a shearing knife on the external shearing die shears the blank to ensure that the blank meets the length requirement;
c. the blank is moved into a first shaping port through a running clamp, a first stamping die and a first main die are in a die closing state, a first main die ejector pin pushes the blank to move towards the first stamping die after being impacted by an air pressure device, and the mushroom-shaped head and the rod part of the stud are upset;
d. after rough upsetting, the blank is moved into a second shaping port, a second die and a second main die are in a die closing state, and a second main die ejector pin pushes the blank to move towards the second die after being impacted by an air pressure device, so that the head of the blank is upset into an arc-shaped head and a first rod;
e. then, the blank is moved to a third shaping opening, the third stamping die and the third main die are in a die closing state, an ejector pin of the third main die pushes the blank to move towards the third stamping die after being impacted by an air pressure device, meanwhile, the rear end of the head part is cut into a square shape by the square die sheet, the tail end of the blank is extruded into a second rod part by the third shaping opening, and the front end of the head part is extruded with a flash by the micro-arc notch;
f. and (3) the blank is moved into the material placing port, the fourth die and the fourth main die are in a die closing state, the ejector pin of the fourth main die pushes the blank to move towards the die core after being impacted by the air pressure device, the flash is quickly removed, and the formed square bolt is discharged from the discharge port.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210014689.8A CN114273600B (en) | 2022-01-07 | 2022-01-07 | Square neck bolt, forming die and forming process |
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| CN202210014689.8A CN114273600B (en) | 2022-01-07 | 2022-01-07 | Square neck bolt, forming die and forming process |
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| CN114273600B CN114273600B (en) | 2024-04-09 |
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| KR20080096936A (en) * | 2007-04-30 | 2008-11-04 | 주식회사 경민 | Manufacturing method of ball stud and the forging products thereof |
| KR20100043747A (en) * | 2008-10-21 | 2010-04-29 | 주식회사 선일다이파스 | The manufacturing method of a monolithic cam washer and cam bolt |
| CN103161809A (en) * | 2011-12-14 | 2013-06-19 | 佘伯金 | Round head square neck bolt for towel barrel of new energy wind generating set |
| CN203130730U (en) * | 2012-12-28 | 2013-08-14 | 辽宁华隆电力科技有限公司 | Square-neck fastening assembling bolt and electric conduction busbar terminal matched with square-neck fastening assembling bolt |
| CN204094038U (en) * | 2014-08-15 | 2015-01-14 | 宾科汽车紧固件（昆山）有限公司 | Special shaped screw bolt cold-heading device |
| CN109175887A (en) * | 2018-07-18 | 2019-01-11 | 上海顺翼紧固件有限公司 | A kind of production technology and its application of Sifangtai contrast section bolt |
| CN208811015U (en) * | 2018-07-18 | 2019-05-03 | 上海顺翼紧固件有限公司 | A kind of four directions shoulder bolt cold-heading molding shaving die |
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2022
- 2022-01-07 CN CN202210014689.8A patent/CN114273600B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080096936A (en) * | 2007-04-30 | 2008-11-04 | 주식회사 경민 | Manufacturing method of ball stud and the forging products thereof |
| KR20100043747A (en) * | 2008-10-21 | 2010-04-29 | 주식회사 선일다이파스 | The manufacturing method of a monolithic cam washer and cam bolt |
| CN103161809A (en) * | 2011-12-14 | 2013-06-19 | 佘伯金 | Round head square neck bolt for towel barrel of new energy wind generating set |
| CN203130730U (en) * | 2012-12-28 | 2013-08-14 | 辽宁华隆电力科技有限公司 | Square-neck fastening assembling bolt and electric conduction busbar terminal matched with square-neck fastening assembling bolt |
| CN204094038U (en) * | 2014-08-15 | 2015-01-14 | 宾科汽车紧固件（昆山）有限公司 | Special shaped screw bolt cold-heading device |
| CN109175887A (en) * | 2018-07-18 | 2019-01-11 | 上海顺翼紧固件有限公司 | A kind of production technology and its application of Sifangtai contrast section bolt |
| CN208811015U (en) * | 2018-07-18 | 2019-05-03 | 上海顺翼紧固件有限公司 | A kind of four directions shoulder bolt cold-heading molding shaving die |
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|---|---|
| CN114273600B (en) | 2024-04-09 |
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