Large-upsetting-ratio bolt head forming die

Abstract

The utility model discloses a large upsetting ratio bolt head forming die which comprises a pre-upsetting die and a finish forging die, in the pre-upsetting die, an upper punch is installed on an upper bottom plate, a tail punch, a material ejection punch and an adjusting pad are arranged on a lower bottom plate, a lower round die outer sleeve is arranged on the adjusting pad, a lower die and a guide die are arranged in the lower round die outer sleeve, and the finish forging die is arranged on the lower round die outer sleeve. The upper bottom plate, the lower bottom plate and the material returning cross beam are connected together through pull rods, and a material returning tail punch is arranged on the material returning cross beam; in the finish forging die, an upper die plate and a guide rail are arranged on an upper bottom plate, a limiting block is arranged at the front end of the guide rail, an upper die base is arranged on the upper die plate, and an upper punch is arranged on the upper die base. A lower die, a lower round die, an ejector punch and a tail punch are arranged on the lower bottom plate, a guide die is arranged below the lower round die, and an air cylinder is arranged on the upper bottom plate. Products produced through the forming die are stable in size, and the forming die can be widely applied to production of bolts with the large upsetting ratio.

Description

TECHNICAL FIELD

[0001] The utility model relates to a big upsetting ratio bolt head forming die. BACKGROUND

[0002] The upsetting ratio refers to the ratio of the length of the deformed part of the blank to the diameter, and the upsetting ratio directly affects the quality of the product and the service life of the die in practical application. When the upsetting ratio is too large, longitudinal bending may occur during one upsetting, resulting in defects such as product interlayer. Therefore, it is urgent to design a forming die for a bolt with a large head upsetting ratio, which can form the required shape and avoid the above defects. SUMMARY

[0003] In order to overcome the above-mentioned shortcomings of the prior art, the utility model provides a big upsetting ratio bolt head forming die.

[0004] The utility model discloses a big upsetting ratio bolt head forming die, including pre upsetting die and final forging die, wherein: pre upsetting die includes upper bottom plate, lower bottom plate and material withdrawal crossbeam, installs on the upper bottom plate and goes up to punch, sets up tail punch, material ejecting punch and adjusting pad on the lower bottom plate, sets up lower round die outer cover on adjusting pad, sets up lower die and guide die in lower round die outer cover, upper bottom plate, lower bottom plate and material withdrawal crossbeam are connected together through draw bar, sets up material withdrawal tail punch on material withdrawal crossbeam;Final forging die includes upper bottom plate, lower bottom plate and material withdrawal crossbeam, sets up upper die plate and guide rail on the upper bottom plate, sets up limit block on the front end of guide rail, sets up upper die seat on the upper die plate, sets up upper punch on the upper die seat;Set up lower die, lower round die, material ejecting punch and tail punch on the lower bottom plate, set up guide die below lower round die, fix lower die, lower round die and guide die on the lower bottom plate through pressing plate, set up air cylinder on the upper bottom plate, the connecting rod of air cylinder is connected with upper die plate.

[0005] Compared with the prior art, the utility model has the following advantages:

[0006] (1) the utility model discloses a pre upsetting die to the workpiece and carries out initial forming, makes the workpiece head forming part upsetting ratio to reduce, avoids the workpiece and appears bending when final forging.

[0007] (2) the utility model discloses a pre upsetting die to the workpiece and carries out initial forming process as cold upsetting process, need not heat, compared with the prior art that two upsetting all adopt hot upsetting process, the utility model discloses can lower energy consumption, process cost is lower, and the application scene is wide.

[0008] (3) the utility model discloses a forming die and forming process production's product size stability, can be widely applied in the production of big upsetting ratio bolt.

[0009] (4) The utility model discloses improve the lubricity of the workpiece surface through the saponification treatment to bar material before pre-upsetting, make the workpiece more easily form. BRIEF DESCRIPTION OF DRAWINGS

[0010] The utility model will be explained through example and the mode of referring to the drawings, wherein:

[0011] Figure 1 It is the structure schematic diagram of the pre-upsetting die of the utility model;

[0012] Figure 2 It is the front view of the final forging die of the utility model;

[0013] Figure 3 It is the sectional view of the final forging die of the utility model;

[0014] Figure 4 It is the product shape of the initial forming of the pre-upsetting die of the utility model;

[0015] Figure 5 It is the product shape of the final forming of the final forging die of the utility model;

[0016] The reference signs in the drawing include:

[0017] (I) pre-upsetting die:

[0018] Upper bottom plate 1, upper die seat 2, upper punch 3, lower die 4, lower round die outer sleeve 5, guide die 6, material ejecting punch 7, adjusting pad 8, pull rod 9, lower bottom plate 10, tail punch 11, material ejecting tail punch 12, material ejecting crossbeam 13;

[0019] (II) final forging die:

[0020] Cylinder 21, cylinder seat 22, upper bottom plate 23, connecting rod 24, limit block 25, pressing plate 26, lower bottom plate 27, pull rod 28, upper die plate 29, upper die seat 30, upper punch 31, upper die fixed sleeve 32, lower die 33, lower round die 34, guide die 35, material ejecting punch 36, tail punch 37, material ejecting crossbeam 38, pull rod seat 39, guide rail 40. DETAILED DESCRIPTION

[0021] A big upsetting ratio bolt head forming die, include: pre-upsetting die and final forging die, wherein:

[0022] (I) the structure of pre-upsetting die as Figure 1As shown, the assembly includes: an upper base plate 1, an upper mold base 2, an upper punch 3, a lower mold 4, a lower circular mold outer sleeve 5, a guide mold 6, an ejector punch 7, an adjusting pad 8, a tie rod 9, a lower base plate 10, a tail punch 11, an ejector tail punch 12, and an ejector beam 13. The upper punch 3 is connected to the upper base plate 1 via the upper mold base 2. The ejector tail punch 12 is placed on the ejector beam 13, which is fixed to the tie rod 9 via a threaded connection. The tie rod 9 is fixed to the upper base plate 1 via a threaded connection. The upper base plate 1 is bolted to the equipment slider. The lower mold 4 and the lower circular mold outer sleeve 5 are assembled together via an interference fit. A guide mold 6 is installed in the lower circular mold outer sleeve 5. The lower circular mold outer sleeve 5 is placed on the adjusting pad 8, which is placed on the lower base plate 10. The tail punch 11 and the ejector punch 7 are installed on the lower base plate 10.

[0023] (II) The structure of the final forging die is as follows: Figure 2 and Figure 3 As shown, it includes: cylinder 21, cylinder seat 22, upper base plate 23, connecting rod 24, limit block 25, pressure plate 26, lower base plate 27, pull rod 28, upper template 29, upper mold base 30, upper punch 31, upper mold fixing sleeve 32, lower mold 33, lower circular mold 34, guide mold 35, ejector punch 36, tail punch 37, ejector beam 38, pull rod seat 39, and guide rail 40. The upper punch 31 is connected to the upper mold base 30 via the upper mold fixing sleeve 32. The upper mold base 30 is connected to the upper template 29 via screws. The upper template 29 is connected to the piston rod of cylinder 21 via the connecting rod 24. Cylinder 21 is connected to cylinder seat 22 via bolts. Cylinder seat 22 is fixed to the equipment slider via bolts. The upper template 29 can slide within the guide rail 40. The guide rail 40 is connected to the upper base plate 23 via bolts. At the front end of the guide rail 40 ( Figure 2The limiting block 25 is arranged at the left end of the upper die plate 29 for limiting the upper die plate 29, the upper base plate 23 is fixed with the equipment slide through bolts, the pull rod 28 is connected with the pull rod seat 39 through threads, the pull rod seat 39 is fixed with the equipment slide through bolts, the material withdrawing beam 38 is fixed with the pull rod 28 through nuts, the tail punch 37 is placed on the material withdrawing beam 38, the lower die 33, the lower round die 34, the guide die 35 and the pressing plate 26 are connected with the lower base plate 27 through bolts, the lower base plate 27 is connected with the equipment workbench through bolts, and the initial state of the air cylinder 21 is the contraction state in the working process; the workpiece is placed in the lower die 33 and positioned through the guide die 35. The air cylinder 21 is started to open the air cylinder 21 and eject, the air cylinder 21 drives the upper die plate 29, the upper die seat 30 and the upper punch 31 to move through the connecting rod 24, the upper die plate 29 stops after contacting the limiting block 25, the press switch is started, the equipment slide goes down, the upper punch 31 extrudes the workpiece to make the workpiece be formed in the lower die 33. After forming, the equipment slide goes up to drive the pull rod 28 and the material withdrawing beam 38 to go up together, the material withdrawing beam 38 contacts the tail punch 37 after going up for a distance to drive the material ejecting punch 36 to go up, the workpiece is ejected, the slide returns to the position, the displacement sensor transmits a signal to drive the air cylinder 21 to return, the air cylinder 21 drives the upper die plate 29, the upper die seat 30 and the upper punch 31 to move through the connecting rod 24, and the upper punch 31 moves to leave the material taking position to facilitate material taking.

[0024] The forming process of the large upsetting ratio bolt head forming die adopts the following steps:

[0025] Step one, saponification treatment is performed on the bar material:

[0026] The saponification liquid is prepared according to the mass ratio of concentrated liquid to water as 250:6000, the concentrated liquid is added first, then the water is slowly added, and the saponification liquid is continuously stirred until uniform, and then heated to (70-80) DEG C, then the workpiece is placed in the saponification liquid with the temperature of (75±5) DEG C and uniform stirring, slightly shakes, so that the workpiece is fully contacted with the saponification liquid, and then placed for (10-20) minutes, and then dried, the product surface is required to have a uniform white saponification film, so as to improve the lubricity of the workpiece surface;

[0027] Step two, the bar material subjected to the saponification treatment in step one is initially formed by using a pre-upsetting die:

[0028] (1) the upper punch 3 is installed in the upper die seat 2, and then the upper die seat 2 is connected with the upper base plate 1 through bolts; the material withdrawing tail punch 12 is placed on the material withdrawing beam 13, and then the material withdrawing beam 13 is fixed with the pull rod 9 through threads; the tail punch 11 and the material ejecting punch 7 are arranged on the lower base plate 10, and then the lower base plate 10 is installed with the pull rod 9, and then the pull rod 9 is fixed with the upper base plate 1 through threads;

[0029] (2) Place the guide mold 6 in the lower round mold sleeve 5, and then assemble the lower mold 4 and the lower round mold sleeve 5 together by interference fit. Then place the bar material that has been saponified in step one into the lower mold 4 and position it by the guide mold 6; place the lower round mold sleeve 5 on the adjusting pad 8, and then place the adjusting pad 8 on the lower base plate 10; place the lower base plate 10 on the equipment workbench, and connect the upper base plate 1 to the equipment slider by bolts.

[0030] (3) The equipment slider moves downward, driving the upper punch 3 to move downward, and together with the top punch 7 and the tail punch 11, it extrudes the bar material to form the bar material in the lower die 4.

[0031] (4) After forming, the equipment slider moves upward, driving the pull rod 9 and the ejector beam 13 connected to the pull rod 9 to move upward. The ejector beam 13 drives the ejector tail punch 12 to move upward. After moving upward a certain distance, the ejector tail punch 12 contacts the tail punch 11, driving the ejector punch 7 to move upward, thus ejecting the initially formed workpiece (such as...). Figure 4 (As shown) Top out.

[0032] Product changeover can be achieved by replacing the upper punch 3, lower die 4, and guide die 6 of the pre-upsetting mold; the head height can be finely adjusted by replacing the adjusting shim 8, which is simple and convenient.

[0033] Step 3: Place the workpiece that has undergone preliminary shaping in Step 2 into a medium-frequency induction coil and heat it to 1100℃ to 1200℃. The medium-frequency induction coil is a coil of copper tube wound in a spiral shape. When the induction coil is energized, the workpiece in the induction coil is subjected to electromagnetic induction, generating an induced electromotive force and forming an induced current. The induced current overcomes the resistance of the workpiece itself and generates Joule heat, thereby raising the temperature of the workpiece.

[0034] Step 4: Place the heated workpiece into the final forging die for final forging.

[0035] (1) Connect the upper punch 31 to the upper die base 30 through the upper die fixing sleeve 32. The upper die base 30 is connected to the upper template 29 through screws. The upper template 29 is connected to the piston rod of the cylinder 21 through the connecting rod 24. The cylinder 21 is connected to the cylinder seat 22 through bolts. The cylinder seat 22 is fixed to the equipment slider through bolts. Install the upper template 29 in the guide rail 40. Then connect the guide rail 40 to the upper base plate 23 through bolts. The upper base plate 23 is fixed to the equipment slider through bolts. Connect the pull rod 28 to the pull rod seat 39 through threads. The pull rod seat 39 is fixed to the equipment slider through bolts.

[0036] (2) the lower die 33, the lower circular die 34, the guide die 35, the pressing plate 26 are connected together through bolts and the lower bottom plate 27, the lower bottom plate 27 is connected together with the equipment workbench through bolts; the material return beam 38 is fixed together with the pull rod 28 through nuts, and the tail punch 37 is placed on the material return beam 38;

[0037] (3) before starting work, the air cylinder 21 is in the contracted state, then the workpiece is placed in the lower die 33, and is positioned through the guide die 35;

[0038] (4) starting the air cylinder switch, the air cylinder 21 is ejected, and the air cylinder 21 drives the upper die plate 29 and the upper die seat 30 and the upper punch 31 to move through the connecting rod 24, and the upper die plate 29 stops when moving to the front end and contacting the limiting block 25;

[0039] (5) starting the press switch, the equipment slider goes down, drives the upper punch 31 to move downward, cooperates with the material ejection punch 36 and the tail punch 37 to extrude the workpiece, and the workpiece is formed in the lower die 33;

[0040] (6) after forming, the equipment slider goes up together with the pull rod 28 and the material return beam 38, and after going up for a distance, the material return beam 38 contacts the tail punch 37, drives the material ejection punch 36 to go up, and the workpiece is ejected;

[0041] (7) after the equipment slider returns to the position, the displacement sensor transmits a signal to link the air cylinder 21 to return, and the air cylinder 21 drives the upper die plate 29 and the upper die seat 30 and the upper punch 31 to move backward through the connecting rod 24, and the upper punch 31 moves to empty the material taking position, which is convenient for taking material. Thus, the final forging forming is completed, and finally the large upset forging ratio bolt as shown in Figure 5 is obtained.

Claims

1. A large upset ratio bolt head forming die characterized by: The pre-upsetting die and the finish forging die are provided, wherein the pre-upsetting die comprises an upper bottom plate, a lower bottom plate and a material removing beam, an upper punch is installed on the upper bottom plate, a tail punch, a material ejecting punch and an adjusting pad are arranged on the lower bottom plate, a lower round die sleeve is arranged on the adjusting pad, a lower die and a guide die are arranged in the lower round die sleeve, the upper bottom plate, the lower bottom plate and the material removing beam are connected together through a pull rod, a material removing tail punch is arranged on the material removing beam; the finish forging die comprises an upper bottom plate, a lower bottom plate and a material removing beam, an upper die plate and a guide rail are arranged on the upper bottom plate, a limiting block is arranged at the front end of the guide rail, an upper die seat is arranged on the upper die plate, an upper punch is arranged on the upper die seat; a lower die, a lower round die, a material ejecting punch and a tail punch are arranged on the lower bottom plate, a guide die is arranged below the lower round die, the lower die, the lower round die and the guide die are fixed on the lower bottom plate through a pressing plate, the upper bottom plate is arranged on a pull rod seat, the pull rod seat, the lower bottom plate and the material removing beam are connected together through the pull rod, a gas cylinder is arranged on the upper bottom plate, and a connecting rod of the gas cylinder is connected with the upper die plate.

2. A large upset ratio bolt head forming die according to claim 1, characterized in that: The upper punch of the pre-upsetting die is connected with the upper bottom plate through the upper die seat.

3. A large upset ratio bolt head forming die according to claim 1, characterized in that: The lower die of the pre-upsetting die is assembled with the lower round die sleeve through interference fit.

4. A large upset ratio bolt head forming die according to claim 1, characterized in that: The material removing beam of the pre-upsetting die is fixed together with the pull rod through thread connection, and the pull rod is fixed together with the upper bottom plate through thread connection.

5. A large upset ratio bolt head forming die as defined in claim 1 wherein: The upper punch of the finish forging die is connected with the upper die seat through the upper die fixing sleeve.

6. A large upset ratio bolt head forming die as defined in claim 1 wherein: The gas cylinder of the finish forging die is fixed on the upper bottom plate through the gas cylinder seat.

7. A large upset ratio bolt head forming die as defined in claim 1 wherein: The pull rod of the finish forging die is fixed together with the pull rod seat through thread connection, and the material removing beam is fixed together with the pull rod through a nut.

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