CN111590008A - One-step forming process for inner hexagonal round tail bolt and bolt forming die used by same - Google Patents
One-step forming process for inner hexagonal round tail bolt and bolt forming die used by same Download PDFInfo
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- CN111590008A CN111590008A CN202010500476.7A CN202010500476A CN111590008A CN 111590008 A CN111590008 A CN 111590008A CN 202010500476 A CN202010500476 A CN 202010500476A CN 111590008 A CN111590008 A CN 111590008A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/44—Making machine elements bolts, studs, or the like
- B21K1/46—Making machine elements bolts, studs, or the like with heads
- B21K1/463—Making machine elements bolts, studs, or the like with heads with recessed heads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K27/00—Handling devices, e.g. for feeding, aligning, discharging, Cutting-off means; Arrangement thereof
- B21K27/06—Cutting-off means; Arrangements thereof
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Abstract
The invention discloses a one-step forming process of an inner hexagonal round-tail bolt and a bolt forming die used by the same, and the process comprises the following steps: when the wire is cut, the cut surface at one end of the cut material forms an inclined plane, then the inclined plane is sent into a four-punch four-die to sequentially carry out chamfering, round tail forming, bolt head pre-forming and bolt blank forming, the bolt forming die comprises a movable die, a first die, a second die, a third die, a four-punch fixed die and a first die, a second die, a third die and a fourth die which are arranged on the movable die and are correspondingly inserted with the first die, the second die and the third die, the four-way material rod comprises a first second material rod, a third material rod and a four-way material rod in a four-way mold, and a first starting rod, a second starting rod, a third starting rod and a four starting rod which are respectively used for driving the first second material rod, the third starting rod and the four-way material rod, wherein a chamfer inner hole is formed in one end of a cut material, a chamfer angle is formed in the first end of the cut material, step-shaped inner mold holes with the diameter smaller than that of the other end are formed in the second mold, the third mold and the four-way mold, and the second material rod, the third material rod and the fourth material rod are correspondingly inserted into.
Description
Technical Field
The invention relates to the technical field of screw machining, in particular to a one-step forming process of an inner hexagonal round-tail bolt and a bolt forming die used by the same.
Background
Traditional hexagon socket head circle tail bolt is because the shaping head dashes wrench hole and will the shaping afterbody circular arc atress very big, and afterbody circular arc size is hardly beaten once and is target in place, generally beats out with three moulds three and carries out machine tooling again, extravagant material, and the machine tooling cost is high, occupies the turnover space, extravagant manpower and material resources. Even if the improved four-die four-one-step forming circular arc is designed, the circular arc is cut according to the conventional method, the end face is flat, according to the flowability of metal materials, special treatment is not needed, when one die is drawn out, the periphery is high, the middle is low, the end face is sunken, the later-stage forming circular arc is not smooth and full or has small steps, the size is not in place, the material feeding rod is as long as the main die, the material feeding rod is used for placing the circular arc and binding the air exhaust hole, the stress is large, the circular arc is easy to crack, generally, thousands of the circular arc are formed, few hundreds of the circular arcs are cracked, the cost is high, during continuous production, defective products and difficult selection are easy to occur, when mass production is met, a production worker needs to replace the circular arc, the inner hexagonal circular arc bolt is mainly formed by the material discharging rod, the tail circular arc is easy to crack due to the material discharging hole.
Disclosure of Invention
In order to overcome the defects, the invention provides the inner hexagonal round tail bolt one-step forming process and the bolt forming die used by the inner hexagonal round tail bolt one-step forming process.
The technical scheme adopted by the invention for solving the technical problem is as follows: an inner hexagonal round-tail bolt one-time forming process comprises the following specific steps:
the method comprises the following steps: cutting material
Cutting the wire to form a cut material, and enabling a cut surface at one end of the cut material to form an inclined surface;
step two: chamfering
Feeding the cut material into a first die, and chamfering one end with an inclined plane;
step three: shaping of round tails
Feeding the cut material subjected to chamfering into a second die, and forming an arc on the other end of the cut material;
step four: bolt head preforming
Feeding the cut material into a third die, and upsetting the chamfered end of the cut material to preliminarily form a bolt head;
step five: forming a bolt blank:
and (5) feeding the cut material into a fourth die, and finally forming the shape of the head of the bolt and the end face hexagonal groove.
As a further improvement of the invention, in the first step, the wire is designed to be smaller than the wire diameter of the finished product by 0.3-0.35mm, and in the second step, the aperture of the first inner hole of the fixed die is matched with the outer diameter of the finished product.
As a further improvement of the invention, a punch on a first punch of the movable die drives all cut materials into an inner hole of a first die of the fixed die.
A bolt forming die comprises a moving die, a fixed die, a first die, a second die, a third die, a fourth die, a first punch, a second punch, a third punch, a fourth punch, a first material passing rod, a second material passing rod, a third material passing rod, a fourth material passing rod, a first starting rod, a second starting rod, a third starting rod and a fourth starting rod, wherein the first die, the second die, the third die and the fourth die are fixedly arranged on the fixed die respectively, the first punch, the second punch, the third punch and the fourth punch are fixedly arranged on the moving die respectively, the first punch, the second punch, the third punch and the fourth punch are respectively and oppositely arranged with one end of the first die, the second die, the third die and the fourth die, the first punch, the second punch, the third punch and the fourth punch are respectively provided with a first punch, a second punch, a third punch and a fourth punch which can punch one end of a material to be cut off, and the shapes of the first punch, the second punch, the third punch and the fourth punch are respectively matched with the material to be cut off, a chamfer inner hole with one end diameter larger than the other end diameter is formed in the first die, the two ends of the chamfer inner hole are in transitional connection through chamfer inclined planes, one end of a first material passing rod can be inserted into one end with small diameter of the chamfer inner hole in a sliding manner, step-shaped inner die holes with one end diameter smaller than the other end diameter are formed in the second die, the third die and the fourth die respectively, one ends of a second material passing rod, a third material passing rod and a fourth material passing rod are inserted into one end with small diameter of the step-shaped inner die holes of the second die, the third die and the fourth die in a one-to-one corresponding manner respectively, the heads with the diameter expanded outwards at the other ends of the second material passing rod, the third material passing rod and the fourth material passing rod are stopped on step surfaces formed between the two ends of the step-shaped inner die holes, one end of the first material passing rod is an inclined plane, one ends of the second material passing rod, the third material passing rod and the, The third starting rod and the fourth starting rod can be inserted into one end of the second die, the third die and the fourth die in a sliding mode respectively, the diameter of the step-shaped inner die hole of the third die is large, the first starting rod, the second starting rod, the third starting rod and the fourth starting rod can tightly abut against the other end of the first material passing rod, the second material passing rod, the other end of the third material passing rod and the other end of the fourth material passing rod respectively and drive the other end of the fourth material passing rod to axially slide and eject materials, a bolt head pre-forming sheet die and a bolt head forming sheet die are further arranged at one end, facing the movable die, of the third die and the fourth die respectively, a pre-forming inner hole communicated with the step-shaped inner die hole of the third die and matched with the pre-forming appearance of the bolt head is formed in the bolt head pre-forming sheet die, and a forming inner hole communicated with the step-shaped inner die hole.
As a further improvement of the invention, a front mold core and a rear mold core of the inner mold are respectively detachably and fixedly arranged in the second mold, the third mold and the fourth mold, a countersunk hole with one end diameter smaller than the other end diameter is formed in the front mold core of the inner mold, the second material passing rod, the third material passing rod and the fourth material passing rod are respectively inserted into the countersunk holes of the second mold, the third mold and the fourth mold, the heads with the outward-expanded diameters at the other ends of the second material passing rod, the third material passing rod and the fourth material passing rod can be accommodated in the countersunk holes of the countersunk holes, a straight hole for inserting the mold opening rod is formed in the rear mold core of the inner mold, and the straight hole is coaxially opposite to the countersunk hole of the front mold core of the inner mold.
As a further improvement of the invention, the inner diameter of the straight hole in the rear die core of the inner die is consistent with the inner diameter of the countersunk head of the countersunk hole in the front die core of the inner die.
As a further improvement of the invention, the second and the third die side walls are also provided with inner die exhaust holes which enable one end of the second and the third die side walls to reach the circumferential outer side wall of the material passing rod through the interior of the material passing rod, and the third and the fourth die side walls are also provided with inner die exhaust holes which enable the outer side wall of the inner die front die core to be communicated with the outside.
As a further improvement of the present invention, three-section two-stage step holes with diameters gradually expanding from one end to the other end are formed in the second mold, the third mold and the fourth mold, the front mold core and the rear mold core of the inner mold are inserted into the second-stage step hole, one end of the inner mold is tightly pressed against the step surface between the first-stage step hole and the second-stage step hole, a rear lock is further provided, the rear lock can be detachably fixed in the third-stage step hole, and the other end of the rear mold core of the inner mold is tightly pressed against one end surface of the rear lock.
As a further improvement of the invention, the rear mold core of the inner mold is a T-shaped structure with one end outer diameter larger than the other end outer diameter, the rear lock is connected in the third section stepped hole in a threaded manner, a through hole for inserting the other end of the rear mold core of the inner mold is formed in the rear lock, and one end of the rear lock is tightly pressed against the stepped surface between the two ends of the rear mold core of the inner mold.
As a further improvement of the invention, the first punch can be just inserted into the inner hole of the first die, the second punch is provided with a funnel-shaped groove with one end diameter smaller than the other end diameter, the third punch is provided with a chamfer groove with lower periphery and higher middle part, and the fourth punch is provided with a raised hexagonal convex column in the middle.
The invention has the beneficial effects that: the invention carries out cutting forming by selecting the wire rod with the diameter smaller than that of the finished product wire, one end of the cut material forms an inclined plane by controlling the position of the cutter during cutting, the cut material is all driven into the first die by the punch of the first punch, the uneven end fabric flows faster when the first die forces the toe, the cut material in the first die can not dent, the second, third and fourth dies are designed into the form of an inner die front core and a rear core, the second, third and fourth die rods are inserted in the inner die front core, a series of specification bolts can be formed by the feed rod, the inner hole of the rear core is enlarged and is made to be as large as the die opening rod of a machine table, thus the length of the feed rod is greatly shortened, the impact force and the thrust of the feed rod are greatly reduced by the enlarged die opening rod, the cut material and the small tail bundled by the first die are added, the cut material is quickly filled with circular arcs in the second and third dies, and the circular arcs are very full, therefore, the four dies are communicated with the outlet rod without exhausting holes, the arc is full and smooth, the pressure of the fourth die for punching the wrench hole and forming the arc is greatly relieved, the output of the bolt is greatly improved, and the quality is stable.
Drawings
FIG. 1 is a front view of a wire cut to form a cut-out of a prior art wire;
FIG. 2 is a view of a bolt forming mold according to the prior art;
FIG. 3 is a view showing the structure of a bolt forming mold according to the present invention;
FIG. 4 is an enlarged view of portion A of FIG. 3;
FIG. 5 is a schematic view of the forming process of the cut material of the present invention;
fig. 6 is an enlarged view of a portion B in fig. 5.
Detailed Description
Example (b): an inner hexagonal round-tail bolt one-time forming process comprises the following specific steps:
the method comprises the following steps: cutting material
Cutting the wire to form a cut material 30, and forming a cut surface at one end of the cut material 30 into an inclined surface 31;
step two: chamfering
Feeding the cut material 30 into the first die 1, and chamfering one end with an inclined surface 31;
step three: shaping of round tails
Feeding the cut material 30 after chamfering into the second die 2, and forming an arc on the other end of the cut material 30;
step four: bolt head preforming
The cut material 30 is sent into the third die 3, and the chamfered end of the cut material 30 is upset to preliminarily form the head of the bolt;
step five: forming a bolt blank:
the cut material 30 is fed into the fourth die 4 to finally form the shape of the head of the bolt and the end face hexagonal groove.
When the wire rod blank, cutter cutting die will break the tradition and leave closely, the material is cut very flat thinking, it is intended to let cutter cutting die leave a little far away, the material terminal surface of cutting out has inclined plane 31 not smooth, because the chamfer of a mould plays crucial effect to follow-up shaping circular arc and the non-flanging of thread rolling, cut off material 30 cut plane not smooth, the end surface fabric that is uneven when the toe is forced to the first mould 1 like this flows comparatively fast, first mould 1 material can not be sunken, round tail top is filled up very fast to second mould 2 and third mould 3, the circular arc is full smooth.
In the first step, the wire is designed to be smaller than the wire diameter of the finished product by 0.3-0.35mm, and the aperture of the inner hole of the first die 1 of the fixed die in the second step is matched with the outer diameter of the finished product.
The punch on the first punch 5 of the movable die drives the whole of the cut-off material 30 into the inner hole of the first die 1 of the fixed die.
The wire diameter of wire rod changes for a short time, a mould forces to restraint, it is big to take out little tail atress, through the repetition test, it is 0.3mm to change finished product wire diameter for a short time, 1 hole of first mould matches with the finished product, can have certain clearance between 1 hole of first mould and the cutting off material 30, will cut off material 30 and all beat into in first mould 1 with first drift towards 5, it is lighter to take out little tail like this, the wire diameter diminishes and cuts off material 30 cut-off surface not level, the end surface fabric that is uneven when a mould forces the toe flows faster like this, 1 material of first mould can not be sunken, round tail top is filled up more soon to second mould 2 and third mould 3, the circular arc is fuller smooth.
A bolt forming die comprises a moving die, a fixed die, a first die 1, a second die 2, a third die 3, a fourth die 4, a first punch 5, a second punch 6, a third punch 7, a fourth punch 8, a first material passing rod 9, a second material passing rod 10, a third material passing rod 11, a fourth material passing rod 12, a first starting rod 13, a third starting rod 14 and a fourth starting rod 15, wherein the first die 1, the second die 2, the third die 3 and the fourth die 4 are fixedly mounted on the fixed die respectively, the first punch 5, the second punch 6, the third punch 7 and the fourth punch 8 are fixedly mounted on the moving die respectively, the first punch 5, the second punch 6, the third punch 7 and the fourth punch 8 are arranged opposite to one end of the first die 1, the second die 2, the third die 3 and the fourth die 4 one by one, and first punch 5, the second punch 6, the third punch 7 and the fourth punch 8 are respectively provided with a first material cutting punch 16, one end of which can cut off materials, the first punch 30 is arranged on the first punch 5, the second punch 6, the third punch 7 and the fourth punch 8, A second punch head 17, a third punch head 18 and a fourth punch head 19, wherein the first punch head 16, the second punch head 17, the third punch head 18 and the fourth punch head 19 are respectively matched with a shape to be formed at one end of each cut-off material 30, a chamfer inner hole 20 with one end diameter larger than that of the other end is formed in the first die 1, two ends of the chamfer inner hole 20 are in transitional connection through a chamfer inclined plane 31, one end of a first material passing rod 9 can be slidably inserted into one end with small diameter of the chamfer inner hole 20, step-shaped inner die holes with one end diameter smaller than that of the other end are respectively formed in the second die 2, the third die 3 and the fourth die 4, one ends of a second material passing rod 10, a third material passing rod 11 and a fourth material passing rod 12 are respectively and correspondingly inserted into one end with small diameter of the step-shaped inner die holes of the second die 2, the third die 3 and the fourth die 4, and heads of the other ends of the second material passing rod 10, the third material passing rod 11 and the fourth material passing rod 12 with outward-expanded diameters are stopped between two ends of On the step surface, one end of the first material passing rod 9 is an inclined surface 31, one end of the second material passing rod 10, one end of the third material passing rod 11 and one end of the fourth material passing rod 12 are concave spherical surfaces, the second starting rod 13, the third starting rod 14 and the fourth starting rod 15 can be respectively inserted into one end of the second die 2, the third die 3 and the fourth die 4 with large diameter of step-shaped inner die holes in a sliding manner, the first starting rod 13, the second starting rod 13, the third starting rod 14 and the fourth starting rod 15 can respectively tightly abut against the other ends of the first material passing rod 9, the second material passing rod 10, the third material passing rod 11 and the fourth material passing rod 12 and drive the other ends to axially slide and eject materials, the third die 3 and the fourth die 4 are respectively provided with a bolt head pre-forming sheet die 21 and a bolt head forming sheet die 22 towards one end of the movable die, a pre-forming inner hole which is communicated with the step-shaped inner die hole of the third die 3 and is matched with the pre-forming appearance of the bolt head is formed in, the bolt head forming sheet die 22 is formed with a formed inner bore which communicates with the stepped inner die bore of the fourth die 4 and matches the final profile of the bolt head. The die holes in the second die 2, the third die 3 and the fourth die 4 are designed into step holes, the die opening rod of the machine table is inserted into one end with the large diameter of the step hole, the length of the material passing rod is greatly shortened, the impact force and the thrust of the material passing rod are greatly reduced by the enlarged die opening rod, then the small tail of the material passing rod is cut off by 30 and the small tail of the first die 1, the cut-off material 30 is filled with circular arcs in the second die and the third die quickly, the circular arcs are full, the material passing rod in the fourth die 4 does not need to be provided with vent holes, the circular arcs are full and smooth, the pressure of the fourth die 4 for punching and pulling the holes and forming the circular arcs is greatly relieved, the yield of bolts is greatly improved, and the quality is stable.
The second mould 2, the third mould 3 and the fourth mould 4 are respectively provided with a front mould core 23 and a rear mould core 24 which can be detached and fixed, a countersunk hole 25 with one end diameter smaller than the other end diameter is formed in the front mould core 23 of the inner mould, the second material passing rod 10, the third material passing rod 11 and the fourth material passing rod 12 are respectively inserted into the countersunk holes 25 of the second mould 2, the third mould 3 and the fourth mould 4, the heads of the second material passing rod 10, the third material passing rod 11 and the fourth material passing rod 12 with the outer diameter expanded at the other ends can be accommodated in the countersunk holes 25 of the countersunk holes 25, a straight hole for inserting the mould opening rod is formed in the rear mould core 24 of the inner mould, and the straight hole is coaxially opposite to the countersunk hole 25 of the front mould core 23 of the inner mould. According to the invention, the second, third and fourth dies are made into the form of an inner die front die core 23 and an inner die rear die core 24, the material passing rod is inserted in the inner die front die core 23, a series of specification bolts can be formed through the material passing rod, the inner hole of the inner die rear die core 24 is enlarged and is made to be as large as the die opening rod of a machine table, so that the length of the material passing rod is greatly reduced, the impact force and the thrust force of the material passing rod are greatly reduced through the enlarged die opening rod, the arc is filled in the second and third dies quickly by the cut-off material 30 and the small tail bound out by the first die 1, and the arc is full, so that the vent hole is not needed when the fourth die 4 passes through the rod, the arc is full and smooth, the pressure of punching and pulling a hand hole and forming the arc of the fourth die 4 is greatly relieved, the yield of the bolts is greatly improved, and the quality is stable.
The inner diameter of the straight hole in the inner die back 24 is consistent with the inner diameter of the countersunk head of the countersunk hole 25 in the inner die front 23.
The second and third mold side walls are also provided with inner mold vent holes 28 which communicate the outer side wall of the inner mold front mold core 23 with the outside. The material passing bar exhaust hole 27 is used for exhausting gas generated during bolt round tail forming, and the inner mold exhaust hole 28 of the fourth mold 4 is used for exhausting gas generated during bolt head forming.
The second mould 2, the third mould 3 and the fourth mould 4 are respectively internally provided with a three-section two-stage step hole with the diameter gradually expanding from one end to the other end, the inner mould front mould core 23 and the inner mould rear mould core 24 are inserted into the second section step hole, one end of the inner mould is tightly supported on a step surface between the first section step hole and the second section step hole, the rear lock 29 is further arranged, the rear lock 29 can be detached and fixedly arranged in the third section step hole, and the other end of the inner mould rear mould core 24 is tightly supported on one end surface of the rear lock 29. Through designing second, third, four mould inner holes into syllogic two-stage step hole, design into the components of a whole that can function independently structure that is formed by the concatenation of centre form front mould benevolence 23 and centre form back mould benevolence 24 with the centre form, improved the convenience of mould centre form processing and installation, reduce the manufacturing and the equipment degree of difficulty, reduced manufacturing cost, simultaneously, can be after changing bolt type and centre form front mould benevolence 23 or centre form back mould benevolence 24 wearing and tearing, can dismantle the change fast, improved the commonality of mould, further reduced manufacturing cost.
The inner die rear die core 24 is a T-shaped structure with one end outer diameter larger than the other end outer diameter, the rear lock 29 is in threaded connection with the third section stepped hole, a through hole for the other end of the inner die rear die core 24 to be inserted is formed in the rear lock 29, and one end of the rear lock 29 is tightly abutted to the stepped surface between the two ends of the inner die rear die core 24.
The punch on the first punch 5 can be just inserted into the inner hole of the first die 1, the second punch 6 is provided with a funnel-shaped groove with one end diameter smaller than the other end diameter, the third punch 7 is provided with a chamfer groove with low periphery and high middle part, and the fourth punch 8 is provided with a raised hexagonal convex column 26 in the middle. The first punch 5 is inserted into the first die 1 to completely drive the cut materials 30 into the first die 1, a toe is formed and a tail is reduced, the second punch 6 is used for forming a round tail on a bolt in an impact mode and forming a funnel-shaped structure on the head of the bolt, the third punch 7 is used for upsetting the head of the formed bolt and forming a chamfer and a central groove, the fourth punch 8 is used for continuously upsetting the bolt head in place and forming a spline, and a hexagonal wrench groove is formed in the center of the bolt head.
Claims (10)
1. The one-step forming process of the inner hexagonal round-tail bolt is characterized by comprising the following steps of: the method comprises the following specific steps:
the method comprises the following steps: cutting material
Cutting the wire to form a cut material (30), and forming a slope (31) on the cut surface at one end of the cut material;
step two: chamfering
Feeding the cut material into a first die, and chamfering one end with an inclined plane;
step three: shaping of round tails
Feeding the cut material subjected to chamfering into a second die, and forming an arc on the other end of the cut material;
step four: bolt head preforming
Feeding the cut material into a third die, and upsetting the chamfered end of the cut material to preliminarily form a bolt head;
step five: forming a bolt blank:
and (5) feeding the cut material into a fourth die, and finally forming the shape of the head of the bolt and the end face hexagonal groove.
2. The one-step forming process of the hexagon socket head cap screw according to claim 1, characterized in that: in the first step, the wire is designed to be smaller than the wire diameter of the finished product by 0.3-0.35mm, and the aperture of the inner hole of the first die of the fixed die is matched with the outer diameter of the finished product in the second step.
3. The inner hexagonal round tail bolt one-time forming process according to claim 1 or 2, characterized in that: and a punch on the first punch of the movable die is used for driving all cut materials into the inner part of the first die inner hole of the fixed die.
4. A bolt forming die used in the inner hexagonal round tail bolt one-step forming process of claim 1 comprises a moving die, a fixed die, a first die (1), a second die (2), a third die (3), a fourth die (4), a first punch (5), a second punch (6), a third punch (7), a fourth punch (8), a first material passing rod (9), a second material passing rod (10), a third material passing rod (11), a fourth material passing rod (12), a first starting rod, a second starting rod (13), a third starting rod (14) and a fourth starting rod (15), wherein the first die, the second die, the third die and the fourth die are respectively and fixedly arranged on the fixed die, the first punch, the second punch, the third punch and the fourth punch are respectively and fixedly arranged on the moving die, and the first punch, the second punch, the third punch and the fourth punch are respectively and oppositely arranged with one end of the first die, the second die, the third die and the fourth die, first dashing, second dashes, third dashes and the fourth dashes and go up to be equipped with respectively and to strike first drift (16), second drift (17), third drift (18) and fourth drift (19) that cut off material one end, first drift, second drift, third drift and fourth drift match its characterized in that with the shape that each cut off material one end will form respectively: a chamfer inner hole (20) with one end diameter larger than the other end diameter is formed in the first die, the two ends of the chamfer inner hole are in transitional connection through chamfer inclined planes, one end of a first material passing rod can be inserted into one end with small diameter of the chamfer inner hole in a sliding manner, step-shaped inner die holes with one end diameter smaller than the other end diameter are formed in the second die, the third die and the fourth die respectively, one ends of a second material passing rod, a third material passing rod and a fourth material passing rod are inserted into one end with small diameter of the step-shaped inner die holes of the second die, the third die and the fourth die respectively in a one-to-one correspondence manner, the heads with outward expanded diameters at the other ends of the second material passing rod, the third material passing rod and the fourth material passing rod are stopped on step surfaces formed between the two ends of the inner die step-shaped inner die holes, one end of the first material passing rod is an inclined plane, one ends of the second material passing rod, the third material passing rod, The third starting rod and the fourth starting rod can be inserted into one end, with the large diameter, of the step-shaped inner die hole of the second die, the third die and the fourth die in a sliding mode respectively, the first starting rod, the second starting rod, the third starting rod and the fourth starting rod can tightly abut against the other ends of the first material passing rod, the second material passing rod, the third material passing rod and the fourth material passing rod respectively and drive the other ends of the first material passing rod, the second material passing rod, the third material passing rod and the fourth material passing rod to axially slide and eject materials, a bolt head pre-forming sheet die (21) and a bolt head forming sheet die (22) are further arranged at one end, facing the movable die, of the third die and the fourth die respectively, a pre-forming inner hole communicated with the step-shaped inner die hole of the third die and matched with the pre-forming appearance of the bolt head is formed in the bolt head forming sheet die, and a forming inner hole communicated with the.
5. The bolt forming die of claim 4, wherein: the die comprises a second die, a third die and a fourth die, wherein a front die core (23) and an inner die rear die core (24) are fixedly arranged in the second die, the third die and the fourth die in a detachable mode respectively, a counter sink (25) with one end diameter smaller than the other end diameter is formed in the inner die front die core, a second material passing rod, a third material passing rod and a fourth material passing rod are inserted into the counter sinks of the second die, the third die and the fourth die respectively, the heads of the second material passing rod, the third material passing rod and the fourth material passing rod, which are extended outwards in diameter, at the other ends of the second material passing rod, the third material passing rod and the fourth material passing rod, can be accommodated in the counter sinks of the counter sink, a straight hole for inserting the die rod is formed in the inner die rear.
6. The bolt forming die of claim 5, wherein: the inner diameter of a straight hole in the inner die rear die core is consistent with the inner diameter of a countersunk head of a countersunk hole in the inner die front die core.
7. The bolt forming die of claim 6, wherein: the second and the third die side walls are also provided with inner die exhaust holes (28) which communicate the outer side wall of the inner die front die core with the outside.
8. The bolt forming die of claim 6, wherein: the second mould, the third mould and the fourth mould are internally provided with three-section two-stage step holes with diameters gradually expanded from one end to the other end, a front mould core and a rear mould core of the inner mould are inserted into the second-section step holes, one end of the inner mould is tightly supported on a step surface between the first-section step holes and the second-section step holes, a rear lock (29) is further arranged, the rear lock can be detached and fixedly installed in the third-section step holes, and the other end of the rear mould core of the inner mould is tightly supported on one end surface of the rear lock.
9. The bolt forming die of claim 8, wherein: the back mould benevolence of centre form is the T shape structure that one end external diameter is greater than the other end external diameter, and back lock screw thread is connected in the third section step is downthehole, is formed with in the back lock and supplies the centre form back mould benevolence other end to insert the perforation of establishing, and back lock one end is tightly supported on the step face between the mould benevolence both ends behind the centre form.
10. The bolt forming die of claim 8, wherein: the first punch can be just inserted into the inner hole of the first die, the second punch is provided with a funnel-shaped groove with one end diameter smaller than the other end diameter, the third punch is provided with a chamfer groove with lower periphery and higher middle part, and the fourth punch is provided with a raised hexagonal convex column (26) in the middle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010500476.7A CN111590008A (en) | 2020-06-04 | 2020-06-04 | One-step forming process for inner hexagonal round tail bolt and bolt forming die used by same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010500476.7A CN111590008A (en) | 2020-06-04 | 2020-06-04 | One-step forming process for inner hexagonal round tail bolt and bolt forming die used by same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111590008A true CN111590008A (en) | 2020-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010500476.7A Pending CN111590008A (en) | 2020-06-04 | 2020-06-04 | One-step forming process for inner hexagonal round tail bolt and bolt forming die used by same |
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| Country | Link |
|---|---|
| CN (1) | CN111590008A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022267099A1 (en) * | 2021-06-22 | 2022-12-29 | 浙江锐程机械制造有限公司 | Steel bar head upsetting process and steel bar upsetting machine therefor |
-
2020
- 2020-06-04 CN CN202010500476.7A patent/CN111590008A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022267099A1 (en) * | 2021-06-22 | 2022-12-29 | 浙江锐程机械制造有限公司 | Steel bar head upsetting process and steel bar upsetting machine therefor |
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