CN114273600B - Square neck bolt, forming die and forming process - Google Patents
Square neck bolt, forming die and forming process Download PDFInfo
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- CN114273600B CN114273600B CN202210014689.8A CN202210014689A CN114273600B CN 114273600 B CN114273600 B CN 114273600B CN 202210014689 A CN202210014689 A CN 202210014689A CN 114273600 B CN114273600 B CN 114273600B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 210000003739 neck Anatomy 0.000 claims abstract description 75
- 238000010008 shearing Methods 0.000 claims abstract description 45
- 238000007493 shaping process Methods 0.000 claims description 44
- 239000000463 material Substances 0.000 claims description 31
- 238000009966 trimming Methods 0.000 claims description 23
- 238000005520 cutting process Methods 0.000 claims description 11
- 230000000149 penetrating effect Effects 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 4
- 235000001674 Agaricus brunnescens Nutrition 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 description 5
- 238000004080 punching Methods 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000003672 processing method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010273 cold forging Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036186 satiety Effects 0.000 description 1
- 235000019627 satiety Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Abstract
The invention discloses a square neck bolt, a forming die and a forming process thereof, which belong to the technical field of bolt processing and comprise square necks, wherein one end of each square neck is fixedly connected with the center of a head, the other end of each square neck is fixedly connected with the top end of a first rod part, the tail end of each first rod part is fixedly connected with the top end of a second rod part, each square neck extends in a square column shape, the outer diameter of each square neck is larger than that of each first rod part, the outer diameter of each first rod part is larger than that of each second rod part, and the square neck bolt forming die comprises a 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 molding while molding the head pan head in the production process, so that the square neck bolt is manufactured. The square neck of the square neck bolt produced by the processing method is full, the opposite angles collapse, the square neck bolt is easy to slip when assembled with a hand piece, the installation method of large torque is not met, the square neck mould in the cold forging mould of the processing method is subjected to longitudinal force while bearing huge transverse stress, the mould is easy to burst, the service life of the mould is reduced, the production cost is high, the efficiency is low, and the product quality is also greatly reduced.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides a square neck bolt, a forming die and a forming process, wherein the square neck bolt has no recess in the trimming neck and the neck in the cold heading process and has high precision.
In order to achieve the technical purpose, the square neck bolt and the forming die thereof and the forming process adopt the following technical scheme:
the square neck bolt comprises a square neck, one end of the square neck is fixedly connected with the center of the head, the other end of the square neck is fixedly connected with the top end of a first rod portion, the tail end of the first rod portion is fixedly connected with the top end of a second rod portion, the square neck extends in a square column shape, the outer diameter of the square neck is larger than the outer diameter of the first rod portion, and the outer diameter of the first rod portion is larger than the outer diameter of the second rod portion.
Preferably, the edge of the square neck is in arc transition, and arc transition lines are carved on the surface of the square neck.
Preferably, the first rod portion and the second rod portion are reducing rod bodies, and each reducing rod body comprises a large-diameter end and a small-diameter end, and the length of the large-diameter end is greater than that of the 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 sequentially arranged;
the material shearing station comprises an inner shearing die for shearing materials, an outer shearing die and a machine table material blocking device for controlling the shearing length of the materials, wherein an axle center hole matched with the periphery of the materials is formed in the middle of the outer shearing die, the axle center hole extends into the inner shearing die, a pad table is abutted against the bottom of the axle center hole, and a supporting column transversely arranged along the inner part of the inner shearing die is arranged at the bottom of the pad table;
the station comprises a first stamping die and a first main die which are matched with each other, a cavity is formed in the end part of the first stamping die, a push rod closely attached to the cavity wall is arranged in the cavity, a stamping rod is connected to the end part of the push rod, the stamping rod penetrates through the cavity and then stretches into a stamping die cushion block positioned at the other end part of the first stamping die, a head notch with a trapezoid cross section is formed in the bottom of the stamping rod, the head notch is used for pre-upsetting a blank to form a coarse mushroom head, a first main die cushion block is arranged in the first main die, a first shaping port of a first rod part of a coarse upsetting bolt is formed in the end part of the first main die cushion block, a first main die ejector pin with the tail end extending into a first cushion die is in a head-to-tail connection mode, and the first cushion die ejector pin extends to the outside along the inside of the first cushion die;
the second station comprises a second stamping die and a second main die which are matched with each other, the second stamping die comprises a second stamping die shell, a second stamping die core is arranged at the end part of an inner cavity of the second stamping die shell, an arc notch for upsetting the end part of a blank into an arc shape is formed in the end surface of the second stamping die core, the second main die comprises a second main die shell, a 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 port for a second rod part of a thick pier bolt is formed in the second main die cushion block, a second main die ejector pin penetrating through the second main die and the second cushion die to the outside is arranged at the bottom of the second shaping port, the end part of the second shaping port is leveled with the second main die shell, round die plates embedded in the second main die shell are oppositely arranged at the two sides of the second shaping port, and the round die plates are leveled with the end part of the second main die shell;
the three-station comprises a third stamping die and a third main die which are matched with each other, 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 surface 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 square necks and second rod ports is formed in the third main die cushion block, a third main die thimble 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 for shearing bolt necks 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 leveled with the third main die shell;
the four-station die comprises a fourth die and a fourth main die which are matched with each other, the fourth die comprises a fourth die shell, one end of an inner cavity of the fourth die shell is provided with a round trimming die, the other end of the inner cavity of the fourth die shell is provided with a discharge hole, the middle of the round trimming die is provided with a reducing feed inlet, the fourth main die comprises a fourth main die shell, a trimming top die and a fourth pad die are sequentially arranged in the fourth main die shell, a material placing hole for placing a thick bolt is formed in the end part of the trimming top die, and a fourth main die thimble penetrating through the trimming top die and the fourth pad die to the outside is arranged at the bottom of the material placing hole.
Preferably, the first station is used for rough heading blank head and pole portion, the second station is used for shaping head and extrusion to generate first pole portion, the third station is used for shaping head overlap, shearing square neck corner and extrusion to generate second pole portion, the fourth station is used for carrying out side cut and ejection of compact to the head.
Preferably, the first station, the second station, the third station and the fourth station perform station operation through the blank operation clamp.
Preferably, the front end of the ejector pin of the fourth main die closely abuts against the tail end of the blank, and the tail end is provided with an air pressure device for driving the ejector pin of the fourth main die to move towards the trimming ejector die.
Preferably, the air pressure device is further arranged at the tail end of the first main die ejector pin, the tail end of the second main die ejector pin and the tail end of the third main die ejector pin respectively.
Preferably, the bottom of the supporting column is fixedly connected with the bottom of the inner shearing die after reducing.
A square neck bolt forming process comprises the following steps:
a. preparing a blank, wherein the diameter of the blank is the same as the diameter of the head of the bolt, and the length of the blank is equal to the sum of the lengths of the head of the bolt, the square neck, the first rod part and the second rod part;
b. placing one end of the blank into the axle center hole, and abutting the other end of the blank against the end part of the machine table stop device, and cutting the blank by a cutting knife on the outer cutting die to ensure that the blank meets the length requirement;
c. the blank is operated into the first shaping opening through the operating clamp, the first stamping die and the first main die are in a die clamping state, and the ejector pin of the first main die pushes the blank to advance towards the first stamping die after being impacted by the air pressure device, and the mushroom-shaped head part and the rod part of the thick pier bolt are formed;
d. the blank after rough upsetting is operated into a second shaping opening, the second stamping die and the second main die are in a die closing state, and the second main die ejector pin pushes the blank to advance towards the second stamping die after being impacted by the air pressure device, so that the head of the blank is upsetted into an arc head and a first rod part;
e. then the blank is operated to a third shaping opening, the third stamping die and the third main die are in a die clamping state, the third main die ejector pin pushes the blank to advance towards the third stamping die after being impacted by the air pressure device, meanwhile, the rear end of the head part is sheared into a square shape by the square die plate, the tail end of the blank is extruded to form a second rod part by the third shaping opening, and the front end of the head part is extruded and flash by the micro-arc notch;
f. the blank is operated into the material placing opening, the fourth stamping die and the fourth main die are in a die closing state, the fourth main die ejector pin pushes the blank to advance towards the stamping die core after being impacted by the air pressure device, flash is rapidly broken off, and meanwhile, the formed square bolt is discharged from the material discharging opening.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the square neck forming and the tail end forming of the second rod part are integrally arranged as the third shaping opening in three stations, namely, the square neck is trimmed in the whole process of the cold heading bolt, so that the stress condition of the square neck stamping die is improved, the square neck stamping die is only stressed by longitudinal force and is in the steel range of the die, and the service life of the die is prolonged;
2. according to the invention, the bolt neck is square, and is subjected to edge cutting forming, so that the problem that the full square neck is collapsed is avoided compared with the conventional extrusion forming, and the requirement of high torque installation of the bolt without slipping is met;
3. the invention adopts a mode of cooperatively shearing and processing the bolt by the cold piers, so that the bolt is free from deformation in the processing and forming process, the bolt precision is ensured, and meanwhile, the processing defects caused by conventional turning are avoided.
Drawings
FIG. 1 is a front view of a square neck bolt of the present invention;
FIG. 2 is a top view of a square neck bolt of the present invention;
FIG. 3 is a schematic view of the structure of a shearing station in a square neck bolt forming die according to the present invention;
FIG. 4 is a schematic view of a station in a square neck bolt forming die according to the present invention;
FIG. 5 is a schematic diagram of a two-station construction of a square neck bolt forming die according to the present invention;
FIG. 6 is a schematic view of a three-station construction of a square neck bolt forming die according to the present invention;
FIG. 7 is a schematic diagram of a four-station configuration of a square neck bolt forming die according to the present invention;
FIG. 8 is a schematic view of the process of forming a square neck bolt according to the present invention.
In the figure: 1. square neck; 2. a head; 3. a first lever portion; 4. a second lever portion; 5. a shearing station; 6. a station; 7. a second station; 8. three stations; 9. a fourth station;
501. an inner shear die; 502. an outer shear die; 503. a machine table material blocking device; 504. an axial hole; 505. a pad table; 506. abutting the column;
601. a first die; 602. a first master mold; 603. a push rod; 604. punching a rod; 605. a die cushion block; 606. a head slot; 607. a first master die pad; 608. a first shaping port; 609. a first pad die; 610. a first main mold ejector pin;
701. a second die shell; 702. a second die core; 703. an arc-shaped notch; 704. a second main form; 705. a second master mold; 706. a second pad die; 707. a second master die pad; 708. a second shaping port; 709. a second main mold ejector pin; 710. round mold piece;
801. a third die shell; 802. a third die core; 803. a micro-arc notch; 804. a third main form; 805. a third master mold; 806. a third pad die; 807. a third master die pad; 808. a third shaping port; 809. a third main mold ejector pin; 810. square matrix;
901. a third die shell; 902. round trimming die; 903. a discharge port; 904. reducing feed inlet; 905. a fourth main form; 906. trimming a top die; 907. a fourth pad die; 908. a material placing port; 909. and a fourth main die ejector pin.
Detailed Description
The invention is further described below with reference to the drawings and detailed description:
as shown in fig. 1-2, the square neck bolt comprises a square neck 1, one end of the square neck 1 is fixedly connected with the center of a head 2, the other end of the square neck is fixedly connected with the top end of a first rod part 3, the tail end of the first rod part 3 is fixedly connected with the top end of a second rod part 4, the square neck 1 extends in a square column shape, the outer diameter of the square neck is larger than that of the first rod part 3, and the outer diameter of the first rod part 3 is larger than that of the second rod part 4.
The edge of the square neck part 1 is in arc transition, and arc transition lines are carved on the surface of the square neck part.
The first rod part 3 and the second rod part 4 are reducing rod bodies and comprise a large-diameter end and a small-diameter end, and the length of the large-diameter end is greater than that of the small-diameter end.
As shown in fig. 3-8, the square neck bolt forming die comprises a shearing station 5, a first station 6, a second station 7, a third station 8 and a fourth station 9 which are sequentially arranged;
the material shearing station 5 comprises an inner shearing die 501 for shearing materials, an outer shearing die 502 and a machine table material blocking device 503 for controlling the shearing length of the materials, wherein an axle center hole 504 matched with the periphery of the materials is formed in the middle of the outer shearing die 502, the axle center hole 504 extends into the inner shearing die 501, a pad table 505 is abutted against the bottom of the axle center hole 504, a supporting column 506 transversely arranged along the inner part of the inner shearing die 501 is arranged at the bottom of the pad table 505, and the bottom of the supporting column 506 is fixedly connected with the bottom of the inner shearing die 501 after being reduced;
the first station 6 comprises a first stamping die 601 and a first main die 602 which are matched, a cavity is formed in the end part of the first stamping die 601, a push rod 603 closely attached to the cavity wall is arranged in the cavity, a punching rod 604 is connected to the end part of the push rod 603, the punching rod 604 penetrates through the cavity and then stretches into a stamping die cushion block 605 at the other end part of the first stamping die 601, a head notch 606 with a trapezoid cross section is formed in the bottom of the punching rod 604, the head notch 606 is used for pre-upsetting a blank to form a coarse mushroom head, a first main die cushion block 607 is arranged in the first main die 602, a first shaping opening 608 of a first rod part 3 of a coarse upsetting bolt is formed in the end part of the first main die cushion block 607, a first main die thimble 610 with the tail end extending into the first cushion die 609 is in a whole body, and the first cushion die 609 extends to the outside along the inside of the first cushion die 609;
the second station 7 comprises a second stamping die and a second main die which are matched, the second stamping die comprises a second stamping die shell 701, a second stamping die core 702 is arranged at the end part of an inner cavity of the second stamping die shell 701, an arc-shaped notch 703 for upsetting the end part of a blank into an arc shape is formed in the end surface of the second stamping die core 702, the second main die comprises a second main die 704, a second main die 705 and a second cushion die 706 are sequentially arranged in the second main die 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 for penetrating through the second main die 705 and the second cushion die 706 to the outside is formed in the second main die cushion block 707, a second main die thimble 709 penetrates through the end part of the second main die 705 and the second cushion die 706 to the outside, circular die 710 embedded in the second main die 704 is arranged at two sides of the second shaping port 708, and the circular die 710 is parallel to the end part of the second main die 704;
the third station 8 comprises a third stamping die and a third main die which are matched, the third stamping die comprises a third stamping die shell 801, a third stamping die core 802 is arranged at the inner cavity end part of the third stamping die shell 801, a micro arc notch 803 for forming a head flash is formed in the end surface of the third stamping 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 4 ports of a square neck part 1 is formed in the third main die cushion block 807, a third main die thimble 809 penetrating through the third main die 805 and the third cushion die 806 to the outside is arranged at the bottom of the third shaping port 808, a square die 810 for shearing a bolt neck part is arranged at the end part of the third shaping port 808, the square die 810 is embedded in the third main die shell 804, and the end part is level with the third main die shell 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 an inner cavity of the fourth die shell 901 is provided with a round trimming die 902, the other end of the inner cavity of the fourth die shell 901 is provided with a discharge port 903, the middle part of the round trimming die 902 is provided with a reducing feed port 904, the fourth main die comprises a fourth main die shell 905, a trimming top die 906 and a fourth pad 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 thick 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 pad die 907 to the outside.
In the bolt cold heading forming process, the square mold piece is utilized to shear the square neck, namely, the cold heading process and the shearing process are combined, so that the mold is only subjected to longitudinal force in the square neck forming process without being restrained by transverse force, the whole stress is in the rigidity range of the mold, the loss of the mold is reduced, the service life of the mold is prolonged, meanwhile, the shearing process is adopted, the satiety of the square neck of the bolt is ensured, the problem of concave neck in the extrusion process is avoided, and the forming quality of the bolt is improved.
The first station 6 is used for roughly upsetting the blank head 2 and the rod part, the second station 7 is used for shaping the head 2 and extruding to generate the first rod part 3, the third station 8 is used for shaping the flash of the head 2, shearing corners of the square neck 1 and extruding to generate the second rod part 4, the fourth station 9 is used for trimming the head 2 and discharging, and the first station 6, the second station 7, the third station 8 and the fourth station 9 perform station operation through blank operation clamps. Wherein the blank running clips (not shown) are conventional techniques and are not described in detail herein.
The front end of the fourth main die thimble 909 tightly abuts against the tail end of the blank, the tail end is provided with an air pressure device for driving the air pressure device to move towards the trimming ejector die 906, and the air pressure device is also respectively arranged at the tail end of the first main die thimble 610, the tail end of the second main die thimble 709 and the tail end of the third main die thimble 809. The air pressure 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 the diameter of the head of the bolt, and the length of the blank is equal to the sum of the lengths of the head of the bolt, the square neck, the first rod part and the second rod part;
b. placing one end of the blank into the axle center hole, and abutting the other end of the blank against the end part of the machine table stop device, and cutting the blank by a cutting knife on the outer cutting die to ensure that the blank meets the length requirement;
c. the blank is operated into the first shaping opening through the operating clamp, the first stamping die and the first main die are in a die clamping state, and the ejector pin of the first main die pushes the blank to advance towards the first stamping die after being impacted by the air pressure device, and the mushroom-shaped head part and the rod part of the thick pier bolt are formed;
d. the blank after rough upsetting is operated into a second shaping opening, the second stamping die and the second main die are in a die closing state, and the second main die ejector pin pushes the blank to advance towards the second stamping die after being impacted by the air pressure device, so that the head of the blank is upsetted into an arc head and a first rod part;
e. then the blank is operated to a third shaping opening, the third stamping die and the third main die are in a die clamping state, the third main die ejector pin pushes the blank to advance towards the third stamping die after being impacted by the air pressure device, meanwhile, the rear end of the head part is sheared into a square shape by the square die plate, the tail end of the blank is extruded to form a second rod part by the third shaping opening, and the front end of the head part is extruded and flash by the micro-arc notch;
f. the blank is operated into the material placing opening, the fourth stamping die and the fourth main die are in a die closing state, the fourth main die ejector pin pushes the blank to advance towards the stamping die core after being impacted by the air pressure device, flash is rapidly broken off, and meanwhile, the formed square bolt is discharged from the material discharging opening.
In summary, the present invention is not limited to the preferred embodiments, but includes all equivalent changes and modifications in shape, construction, characteristics and spirit according to the scope of the claims.
Claims (5)
1. A square neck bolt forming die is characterized in that: the device comprises a material shearing station, a first station, a second station, a third station and a fourth station which are sequentially arranged;
the material shearing station comprises an inner shearing die for shearing materials, an outer shearing die and a machine table material blocking device for controlling the shearing length of the materials, wherein an axle center hole matched with the periphery of the materials is formed in the middle of the outer shearing die, the axle center hole extends into the inner shearing die, a pad table is abutted against the bottom of the axle center hole, and a supporting column transversely arranged along the inner part of the inner shearing die is arranged at the bottom of the pad table;
the station comprises a first stamping die and a first main die which are matched with each other, a cavity is formed in the end part of the first stamping die, a push rod closely attached to the cavity wall is arranged in the cavity, a stamping rod is connected to the end part of the push rod, the stamping rod penetrates through the cavity and then stretches into a stamping die cushion block positioned at the other end part of the first stamping die, a head notch with a trapezoid cross section is formed in the bottom of the stamping rod, the head notch is used for pre-upsetting a blank to form a coarse mushroom head, a first main die cushion block is arranged in the first main die, a first shaping port of a first rod part of a coarse upsetting bolt is formed in the end part of the first main die cushion block, a first main die ejector pin with the tail end extending into a first cushion die is in a head-to-tail connection mode, and the first cushion die ejector pin extends to the outside along the inside of the first cushion die;
the second station comprises a second stamping die and a second main die which are matched with each other, the second stamping die comprises a second stamping die shell, a second stamping die core is arranged at the end part of an inner cavity of the second stamping die shell, an arc notch for upsetting the end part of a blank into an arc shape is formed in the end surface of the second stamping die core, the second main die comprises a second main die shell, a 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 port for a second rod part of a thick pier bolt is formed in the second main die cushion block, a second main die ejector pin penetrating through the second main die and the second cushion die to the outside is arranged at the bottom of the second shaping port, the end part of the second shaping port is leveled with the second main die shell, round die plates embedded in the second main die shell are oppositely arranged at the two sides of the second shaping port, and the round die plates are leveled with the end part of the second main die shell;
the three-station comprises a third stamping die and a third main die which are matched with each other, 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 surface 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 square necks and second rod ports is formed in the third main die cushion block, a third main die thimble 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 for shearing bolt necks 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 leveled with the third main die shell;
the four-station die comprises a fourth die and a fourth main die which are matched with each other, the fourth die comprises a fourth die shell, one end of an inner cavity of the fourth die shell is provided with a round trimming die, the other end of the inner cavity of the fourth die shell is provided with a discharge hole, the middle part of the round trimming die is provided with a reducing feed inlet, the fourth main die comprises a fourth main die shell, a trimming top die and a fourth pad die are sequentially arranged in the fourth main die shell, the end part of the trimming top die is provided with a material placing hole for placing a coarse bolt, and the bottom of the material placing hole is provided with a fourth main die thimble penetrating through the trimming top die and the fourth pad die to the outside;
the front end of the ejector pin of the fourth main die closely abuts against the tail end of the blank, and the tail end is provided with an air pressure device for driving the ejector pin of the fourth main die to move towards the trimming ejector die;
the air pressure device is further arranged at the tail end of the first main die ejector pin, the tail end of the second main die ejector pin and the tail end of the third main die ejector pin respectively.
2. The square-neck bolt forming die according to claim 1, wherein: the novel cutting machine comprises a first working station, a second working station, a third working station, a fourth working station and a fourth working station, wherein the first working station is used for rough upsetting of a blank head and a rod portion, the second working station is used for shaping the head and extruding to generate a first rod portion, the third working station is used for shaping the head to flash, shearing corners of a square neck and extruding to generate a second rod portion, and the fourth working station is used for trimming the head and discharging.
3. The square-neck bolt forming die according to claim 2, wherein: and the first station, the second station, the third station and the fourth station perform station operation through blank operation clamps.
4. The square-neck bolt forming die according to claim 1, wherein: the bottom of the supporting column is fixedly connected with the bottom of the inner shearing die after reducing.
5. A square neck bolt molding process using the square neck bolt molding die according to claim 1, characterized by comprising the steps of:
a. preparing a blank, wherein the diameter of the blank is the same as the diameter of the head of the bolt, and the length of the blank is equal to the sum of the lengths of the head of the bolt, the square neck, the first rod part and the second rod part;
b. placing one end of the blank into the axle center hole, and abutting the other end of the blank against the end part of the machine table stop device, and cutting the blank by a cutting knife on the outer cutting die to ensure that the blank meets the length requirement;
c. the blank is operated into the first shaping opening through the operating clamp, the first stamping die and the first main die are in a die clamping state, and the ejector pin of the first main die pushes the blank to advance towards the first stamping die after being impacted by the air pressure device, and the mushroom-shaped head part and the rod part of the thick pier bolt are formed;
d. the blank after rough upsetting is operated into a second shaping opening, the second stamping die and the second main die are in a die closing state, and the second main die ejector pin pushes the blank to advance towards the second stamping die after being impacted by the air pressure device, so that the head of the blank is upsetted into an arc head and a first rod part;
e. then the blank is operated to a third shaping opening, the third stamping die and the third main die are in a die clamping state, the third main die ejector pin pushes the blank to advance towards the third stamping die after being impacted by the air pressure device, meanwhile, the rear end of the head part is sheared into a square shape by the square die plate, the tail end of the blank is extruded to form a second rod part by the third shaping opening, and the front end of the head part is extruded and flash by the micro-arc notch;
f. the blank is operated into the material placing opening, the fourth stamping die and the fourth main die are in a die closing state, the fourth main die ejector pin pushes the blank to advance towards the stamping die core after being impacted by the air pressure device, flash is rapidly broken off, and meanwhile, the formed square bolt is discharged from the material discharging opening.
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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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| 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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| CN114273600A CN114273600A (en) | 2022-04-05 |
| CN114273600B true 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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|---|---|
| CN114273600A (en) | 2022-04-05 |
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