Upsetting die and die processing method

Abstract

The application relates to the technical field of forging press machine processing, in particular to a upsetting die and a die processing method, the die comprises: an upper die installed on a forging press forming machine tool; a lower die comprising a platform connecting portion and a blank contacting portion, the platform connecting portion is connected to the forging press forming machine tool, the blank contacting portion is arranged on the platform connecting portion, and the blank contacting portion is matched with the upper die and used for blank upsetting; a positioning hole is arranged on the blank contacting portion, and the positioning hole is used for forming a positioning protrusion in the blank upsetting process; the method comprises a turning platform connecting portion step, a turning threaded column step, a positioning hole turning step, a limiting block forming step and a composite assembly step. The application has the effect that subsequent processing positioning is facilitated.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of a forging press, in particular to a upsetting die and a die machining method. BACKGROUND

[0002] At present, in the field of metal forging, upsetting is a key pretreatment process for improving the strength of a workpiece. A traditional process usually adopts a two-step method: first, a steel blank is upset to improve its density and increase the roughness, which is convenient for subsequent finishing, and then the workpiece after upsetting is clamped by a special clamp for finish forging or multiple forging to further improve the strength.

[0003] In the prior art, a patent with the publication number CN208195540U discloses an adjustable upsetting die, which adjusts the height of the lower die through the thread cooperation of the adjusting screw and the adjusting nut, and uses the pressing screw to fix the lower die and the supporting screw to prevent thread damage. The scheme solves the problem of complicated replacement of the traditional backing plate.

[0004] However, the fixed lower die surface is flat, and the die only realizes height adjustment without integrating a positioning structure, so that additional clamping is still needed during finish forging; the lower die is of a whole structure and cannot quickly replace the positioning component according to the size of the workpiece; the upsetting and finish forging are still independent processes, and the positioning datum is lost due to the transfer of the workpiece. SUMMARY

[0005] The application provides a upsetting die and a die machining method, which can at least partially solve the above technical problems.

[0006] In a first aspect, the application provides a upsetting die, which adopts the following technical scheme:

[0007] A upsetting die, comprising:

[0008] An upper die installed on a forging press forming machine;

[0009] A lower die comprising a platform connecting part and a blank contacting part, the platform connecting part being connected to the forging press forming machine, the blank contacting part being arranged on the platform connecting part, and the blank contacting part cooperating with the upper die for blank upsetting; a positioning hole is arranged on the blank contacting part, and the positioning hole is used to form a positioning protrusion during blank upsetting.

[0010] By adopting the technical scheme, the upper die is fixed on the movable beam of the forging press, the lower die is installed on the workbench through the platform connecting part, the heated cylindrical blank is placed on the upper surface of the blank contact part, the upper die is pressed down to perform upsetting, and the metal subjected to the forging is pressed into the positioning hole to form a protruding structure; the upsetting forms the protruding structure at the same time, in the subsequent finish forging process, the protruding structure can be used as a positioning reference, the movement of the blank in the subsequent finish forging process is reduced, the effective hammering in the finish forging process is improved, the influence of the movement of the part on the blank processing is reduced, and the positioning error of the secondary clamping in the traditional process is eliminated; the protruding structure improves the anti-deviation capability of the workpiece during finish forging.

[0011] Optionally, the lower die further comprises:

[0012] a threaded column, which is threadedly connected with the platform connecting part and connects the blank contact part;

[0013] a limiting block, which is arranged in the gap between the blank contact part and the platform connecting part, fills the gap to lock the height, and is used for supporting the blank contact part.

[0014] By adopting the technical scheme, the threaded column is rotated to adjust the height of the blank contact part (adapt to different upsetting ratios), and the limiting block is inserted into the gap to lock the height; the limiting block resists the impact load and prevents plastic deformation of the threaded pair; and through the arrangement of the blank contact part, the lower die of different positioning holes is convenient to replace, the upsetting of the blank of different upsetting ratios is convenient, the adaptability is improved, the stress of the threaded column is reduced through the arrangement of the limiting block, the damage to the threaded column is reduced, the service life of the platform connecting part is maintained, and the replacement frequency is reduced.

[0015] Optionally, a stop assembly is arranged on the limiting block, and the stop assembly comprises:

[0016] a stop block, which is arranged on one side of the blank contact part close to the platform connecting part;

[0017] a first matching block, which is arranged on one side of the limiting block close to the stop block and is provided with a first sliding groove matched with the stop block;

[0018] a second matching block, which is radially slid on the platform connecting part and is connected with the limiting block.

[0019] By adopting the technical scheme, the stop block is welded to the bottom surface of the blank contact part, the first matching block is clamped with the stop block through the sliding groove, the second matching block is radially moved to drive the limiting block, the rotation of the blank contact part is limited when the upsetting is performed, the damage of the threaded column caused by the excessive forging force is reduced, the second matching block maintains the support for the blank contact part, the overall stress of the lower die is transmitted to the forging press, and the damage of the die is reduced.

[0020] Optionally, the first matching block can abut against the side of the blank contact part away from the upper die, and the first matching block is wedge-shaped.

[0021] By adopting the above technical scheme, the face of the wedge-shaped first matching block abuts against the blank contact part, the supporting force on the blank contact part is enhanced with the movement of the first matching block, the force applied by the upper die can be completely transmitted to the lower die, the force applied to the threaded column can be reduced, the stability of the upsetting process die is maintained, and the greater the pressure of the upper die, the stronger the abutting force of the wedge-shaped block against the contact part.

[0022] Optionally, a pushing assembly is arranged on the limiting block, and the pushing assembly comprises:

[0023] A connecting plate is arranged on the limiting block.

[0024] A pushing bolt is arranged on the connecting plate and is threadedly connected with the platform connecting part, and the head of the pushing bolt abuts against the side of the connecting plate away from the platform connecting part.

[0025] By adopting the above technical scheme, after the preliminary installation and abutting of the limiting block are completed, the first matching block supports the blank contact part by rotating and pushing the bolt, and the bolt is tightened in a threaded manner, which can reduce the difficulty of installation of the limiting block component, the sliding of the first matching block is more stable, the sliding force is greater, the support of the blank contact part is facilitated, convenience is provided, and stability is maintained during upsetting.

[0026] Optionally, the pushing assembly further comprises an exit nut, and the exit nut is arranged on the pushing bolt and located on the side of the connecting plate close to the platform connecting part.

[0027] By adopting the above technical scheme, after upsetting or after use, the exit nut is abutted against the connecting plate, and then the pushing bolt is rotated and retracted, so that the retracted bolt drives the connecting plate and the first matching block to move away from the middle part of the blank contact part, the support of the blank contact part is released, the blank contact part with different positioning holes is facilitated to be replaced, the replacement time is shortened, and the replacement and maintenance efficiency is improved.

[0028] Optionally, an ejection hole is arranged on the blank contact part, the ejection hole is in communication with the positioning hole, an ejection rod is slidably connected in the ejection hole, a communication groove in communication with the ejection hole is arranged on the threaded column, a force applying rod is slidably arranged on the blank contact part, the force applying rod cooperates with the ejection rod, and the force applying rod is used to eject the blank.

[0029] By adopting the technical scheme, after upsetting, the embryo piece can be clamped in the positioning hole, the ejector rod is forced by the forcing rod, the protrusion of the embryo piece is separated from the positioning hole, the upsetting efficiency is improved, and if secondary upsetting is performed, the protrusion can be positioned and then the upsetting is performed again, so that the movement of the embryo piece is reduced.

[0030] Optionally, an exhaust hole is formed in the ejector rod and communicates the outside with the positioning hole.

[0031] By adopting the technical scheme, when upsetting, the gas is discharged through the positioning hole and the exhaust hole, the ejector rod serves as a gas guide channel, the gas hole defect rate of the protrusion part is reduced, and the protrusion is formed and pulled out through the exhaust hole, so that the difficulty of pulling out caused by negative pressure is reduced.

[0032] Optionally, the first sliding groove is divided into a sliding area and a fastening area in the vertical direction, a fastening block is slid in the fastening area, a fastening bolt is arranged on the first matching block, the fastening block is slid in the first sliding groove through the fastening bolt, a wedge surface is formed in the fastening block, the wedge surface abuts against the stop block, and when the stop block moves downward, the first matching block is driven to move close to the middle part of the embryo piece contact part.

[0033] By adopting the technical scheme, the stop block moves downward to press the wedge surface of the fastening block, the wedge surface drives the first matching block to contract to the center, and the fastening bolt locks the sliding area; through the above arrangement, the rotation of the threaded column in the upsetting process is reduced, the stress of the lower mold in the vertical direction is kept stable, the stress offset to the threaded column caused by the rotation of the threaded column is reduced, and the damage to the threaded column is reduced.

[0034] In a second aspect, the application provides a mold machining method, which adopts the following technical scheme:

[0035] A mold machining method includes the following steps:

[0036] Turning the platform connecting part: machining an installation surface connected with a forging press machine on a forged steel blank, and turning an internal thread hole in the central area;

[0037] Turning the threaded column: adopting a stepped shaft turning process, machining external threads matched with the platform connecting part at one end, and turning a flange or directly forming an embryo piece contact part at the other end;

[0038] Turning the positioning hole: turning and forming a positioning hole on the surface of the embryo piece contact part;

[0039] Limiting block forming: milling a rectangular alloy steel block into a wedge-shaped contour;

[0040] Composite assembly: rotating the threaded column into the platform connecting part, and installing the limiting block in the gap between the embryo piece contact part and the platform connecting part.

[0041] By adopting the technical scheme, the parts are machined simultaneously in the form of turning in stages and then assembling, and the parts can be perfectly matched by the turning mode, so that the parts are convenient to install and use.

[0042] To sum up, the present application has at least one of the following beneficial technical effects:

[0043] 1. Upsetting and forming a protrusion at the same time, in the subsequent precision forging process, the protrusion structure can be used as a positioning reference, reducing the movement of the blank in the subsequent precision forging process, so that the effective hammering of the precision forging process is improved, and the influence of the movement of the accessory on the processing of the blank is reduced, and the positioning error of the secondary clamping in the traditional process is eliminated; the protrusion structure improves the anti-deviation ability of the workpiece during precision forging;

[0044] 2. The lower die is convenient to replace different positioning holes, the upsetting of the blank with different upsetting ratios is facilitated, the adaptability is improved, the setting of the limiting block reduces the stress of the threaded column, reduces the damage to the threaded column, keeps the service life of the platform connecting part, and reduces the replacement frequency;

[0045] 3. The stop block moves downward to extrude the wedge surface of the fastening block, the wedge surface drives the first matching block to shrink to the center, and the fastening bolt locks the sliding area; through the above setting, the rotation of the threaded column during the upsetting process is reduced, the stress in the vertical direction of the lower die is kept stable, the deviation of the stress to the threaded column caused by the rotation of the threaded column is reduced, and the damage to the threaded column is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 is the overall structure diagram of the mold in embodiment 1 of the present application;

[0047] Figure 2 is the sectional view of the mold in embodiment 1 of the present application;

[0048] Figure 3 is the overall structure diagram of the mold in embodiment 2 of the present application;

[0049] Figure 4 is the sectional view of the mold in embodiment 2 of the present application;

[0050] Figure 5 is Figure 4 is the local enlarged view of region A in

[0051] Figure 6 is the display diagram of the first matching block in embodiment 2 of the present application;

[0052] Figure 7 is the display diagram of the main exhaust hole in embodiment 2 of the present application.

[0053] 100, upper die; 200, lower die; 210, platform connecting part; 211, internal thread hole; 212, second sliding groove; 220, blank contact part; 221, positioning hole; 222, ejection hole; 230, threaded column; 231, connecting groove; 240, limiting block; 300, stop assembly; 310, stop block; 320, first matching block; 321, first sliding groove; 330, second matching block; 340, fastening block; 341, wedge surface; 350, fastening bolt; 400, pushing assembly; 410, connecting plate; 420, pushing bolt; 430, exit nut; 510, ejection rod; 511, oblique exhaust hole; 512, main exhaust hole; 513, inclined surface; 520, force applying rod. DETAILED DESCRIPTION

[0054] The following Figures 1 to 7 The application is further described in detail.

[0055] The embodiment discloses a upsetting die.

[0056] Embodiment 1: Refer to Figure 1 and Figure 2 , the upsetting die mainly comprises an upper die 100 and a lower die 200, the upper die 100 is connected to a forging pressing force applying end of a forging press, and the lower die 200 is connected to a worktable of the forging press, the lower die 200 is formed with a positioning hole 221, when upsetting is performed, a heated blank is placed on the lower die 200, the upper die 100 is driven to slide by the forging press, the upper die 100 applies force to the blank, so that the blank is deformed, part of the structure of the blank protrudes into the positioning hole 221, and a protruding structure is formed, which is used for positioning and fixing in subsequent finish forging or other processes.

[0057] The upper die 100 is fixed to a movable cross beam of the forging press through a flange plate, and the lower die 200 comprises a platform connecting part 210, a threaded column 230, a blank contact part 220 and a limiting block 240. The platform connecting part 210 is mounted on the worktable of the machine tool through bolts, and the center of the platform connecting part 210 is processed with an internal thread hole 211; the threaded column 230 is screwed into the internal thread hole 211 at the lower end, and the blank contact part 220 is welded or integrally formed at the upper end; the positioning hole 221 is arranged on the top surface of the blank contact part 220, and a height-adjustable gap is formed between the blank contact part 220 and the platform connecting part 210; and the limiting block 240 fills the gap and abuts against the blank contact part 220 and the platform connecting part 210, so that the height is locked. When forging is performed, the metal blank forms a protrusion in the positioning hole 221, and the protrusion serves as a positioning reference for subsequent finish forging.

[0058] The depth to which the threaded column 230 is screwed into the platform connecting part 210 determines the size of the gap (adapted to different upsetting ratios). In order to resist the impact of forging, the limiting block 240 is embedded in the gap, the upper and lower surfaces of the rectangular body of the limiting block 240 are precisely ground respectively, and full contact with the bottom surface of the blank contact part 220 and the top surface of the platform connecting part 210 is ensured.

[0059] The implementation principle of this embodiment 1 is that the threaded column 230 is screwed into the platform connecting part 210, the height of the limiting block 240 is selected according to the requirement, the limiting block 240 is placed in the gap between the platform connecting part 210 and the blank contacting part 220, the threaded column 230 is rotated, so that the blank contacting part 220 abuts the limiting block 240 against the platform connecting part 210, and in the upsetting process, the force exerted by the upper die 100 on the lower die 200 is transmitted to the workbench of the forging press through the lower die 200.

[0060] Embodiment 2: Refer to Figures 3 to 7 The difference between this embodiment and embodiment 1 is that in order to increase the stability of the blank contacting part 220 and reduce the probability of rotation of the blank contacting part 220, the limiting block 240 is provided with a stop assembly 300, the stop assembly 300 includes a stop block 310, a first matching block 320 and a second matching block 330, the stop block 310 is welded on the side wall of the blank contacting part 220 close to the platform connecting part 210, and correspondingly, the first matching block 320 is integrally formed on the side of the limiting block 240 facing the stop block 310, a first sliding groove 321 is formed on the side wall of the first matching block 320 close to the stop block 310, one end of the first sliding groove 321 penetrates through the first matching block 320, facilitating the sliding of the stop block 310, the stop block 310 can slide in the first sliding groove 321, and the side wall of the first matching block 320 away from the limiting block 240 can abut against the blank contacting part 220; the second matching block 330 is integrally formed on the side wall of the limiting block 240 away from the first matching block 320, and a second sliding groove 212 is correspondingly formed on the platform connecting part 210, the second sliding groove 212 and the first sliding groove 321 are formed in the same direction, both along the radial direction of the blank contacting part 220, and the second matching block 330 is slidably connected in the second sliding groove 212.

[0061] Further, in order to facilitate the increase of the support force on the blank contacting part 220 during the sliding of the first matching block 320, the contact surface of the first matching block 320 and the blank contacting part 220 is wedge-shaped at 7°, and the inclined surface 513 thereof is in contact with the bottom surface of the blank contacting part 220. When the upper die 100 is pressed down, the wedge-shaped surface supports the blank contacting part 220, so that the forging pressure is transmitted to the platform connecting part 210 through the limiting block 240, and the forging stability is improved.

[0062] Further, in order to facilitate the advancement of the limiting block 240, the limiting block 240 is provided with an advancing assembly 400, the advancing assembly 400 comprises a connecting plate 410 and an advancing bolt 420, the connecting plate 410 is integrally formed or welded on the limiting block 240, the connecting plate 410 extends to the side of the second cooperating block 330 away from the first cooperating block 320, the connecting plate 410 is provided with a rotating hole, the advancing bolt 420 is arranged in the rotating hole of the connecting plate 410 and can rotate in the rotating hole, the head of the advancing bolt 420 can abut against the side wall of the connecting plate 410 away from the threaded column 230, and the threaded portion of the advancing bolt 420 is screwed with the platform connecting portion 210; when the advancing bolt 420 is screwed, the head thereof abuts against the surface of the connecting plate 410, the limiting block 240 is pushed to move to the center of the blank contacting portion 220, and the assembly gap is eliminated.

[0063] Further, in order to facilitate the advancement of the limiting block 240, the limiting block 240 is provided with an advancing assembly 400, the advancing assembly 400 comprises a connecting plate 410 and an advancing bolt 420, the connecting plate 410 is integrally formed or welded on the limiting block 240, the connecting plate 410 extends to the side of the second cooperating block 330 away from the first cooperating block 320, the connecting plate 410 is provided with a rotating hole, the advancing bolt 420 is arranged in the rotating hole of the connecting plate 410 and can rotate in the rotating hole, the head of the advancing bolt 420 can abut against the side wall of the connecting plate 410 away from the threaded column 230, and the threaded portion of the advancing bolt 420 is screwed with the platform connecting portion 210; when the advancing bolt 420 is screwed, the head thereof abuts against the surface of the connecting plate 410, the limiting block 240 is pushed to move to the center of the blank contacting portion 220, and the assembly gap is eliminated.

[0064] Further, in order to facilitate the exit of the protruding structure formed by the embryo part at the positioning hole 221, a ejection hole 222 is opened inside the embryo part contact part 220, which is coaxially communicated with the positioning hole 221. A ejection rod 510 is arranged in the ejection hole 222, which is slidable in the ejection hole 222 with a H7 / g6 level gap fit. The ejection rod 510 is provided with exhaust holes, which are multiple and include inclined exhaust holes 511 and main exhaust holes 512. The side wall of the ejection rod 510 is provided with multiple inclined exhaust holes 511, which are equally spaced along the circumference of the ejection rod 510, and the inclined exhaust holes 511 of the ejection rod 510 are located in the positioning hole 221. The main exhaust hole 512 is opened at the axis of the ejection rod 510 and extends to the end of the ejection rod 510 away from the embryo, and the main exhaust hole 512 is communicated with the inclined exhaust hole 511. The end of the ejection rod 510 away from the embryo is provided with an inclined surface 513, which passes through the main exhaust hole 512. The connection between the embryo part contact part 220 and the threaded column 230 is provided with a connecting groove 231, which is communicated with the ejection hole 222 and communicated with the exhaust holes through the inclined surface 513, so that the exhaust holes are communicated with the positioning hole 221 and the outside. The side wall of the embryo part contact part 220 close to the platform connecting part 210 is slidably connected or detachably connected with a force applying rod 520, which can extend into the connecting groove and abut against the inclined surface 513. When demolding, the force applying rod 520 is knocked, and the force applying rod 520 pushes the ejection rod 510 upward through the inclined surface 513, and the ejection rod 510 lifts the protruding part of the embryo, and at the same time the exhaust holes eliminate the negative pressure adsorption.

[0065] Further, in order to enhance the support of the limiting block 240 part to the embryo part contact part 220, the first sliding groove 321 on the first matching block 320 is vertically divided into a sliding area and a fastening area. The stop block 310 is located in the sliding area and extends to the fastening area; the fastening block 340 is embedded in the fastening area, the wedge surface 341 is opened on the side wall close to the stop block 310, the wedge surface 341 is matched with the bottom surface of the stop block 310, and the fastening block 340 can slide along the opening direction of the first sliding groove 321. The outside of the first matching block 320 is provided with a fastening bolt 350, which is threadedly connected with the first matching block 320 and rotationally connected with the fastening block 340. With the rotation of the fastening bolt 350, the fastening block 340 slides in the fastening area. When the stop block 310 is pressed downward, the wedge surface 341 of the fastening block 340 is pressed, and the downward force drives the fastening block 340 to move the first matching block 320 towards the middle part of the embryo part contact part 220, so that the wedge surface of the first matching block 320 slides, and the support force to the embryo part contact part 220 increases, realizing zero gap locking.

[0066] The implementation principle of this embodiment 2 is that the threaded column 230 is screwed into the platform connecting part 210 to a target height, the limiting block 240 is embedded, the second matching block 330 slides into the second sliding groove 212, the first sliding groove 321 of the first matching block 320 is in contact with the stop block 310, the limiting block 240 is pushed, the stop block 310 slides in the first sliding groove 321, and the gap is eliminated by tightening the push bolt 420; the blank is placed on the blank contact part 220, the upper die 100 is pressed down, the blank is pressed into the positioning hole 221 to form a protruding structure, and the gas is discharged through the exhaust hole.

[0067] When the blank is taken out, the force applying rod 520 is knocked, the ejecting rod 510 is driven to move upwards, and the protruding structure of the blank is pushed out of the positioning hole 221 by the ejecting rod 510.

[0068] When the blank contact part 220 with different positioning holes 221 is replaced, the push bolt 420 is unscrewed, the exit nut 430 is tightened to push the connecting plate 410 away from the limiting block 240, then the limiting block 240 is removed, the threaded column 230 is rotated in the opposite direction, and the blank contact part 220 with different diameter positioning holes 221 is replaced.

[0069] The application is convenient for the blank to form a protruding structure through the positioning hole 221, the protruding structure causes the precision forging offset, the limiting block 240 shares the impact load, and the service life of the threaded pair is prolonged; the exhaust hole design reduces the gas hole defect rate and is convenient for the formation of the protruding structure; the replacement time of the modular blank contact part 220 is shortened, and the forging height can be adjusted through the height adjustment of the blank contact part 220.

[0070] The application also discloses a die machining method.

[0071] The die machining method comprises the following steps:

[0072] The platform connecting part 210 is turned on the forging steel blank to process a mounting surface connected with a forging press machine tool, and an inner threaded hole 211 is turned in the center area;

[0073] Specifically, a 45# forging steel square blank is selected, the blank is quenched and tempered to HRC28-32, the blank is clamped on a vertical lathe, the bottom surface is roughly turned to Ra3.2μm, and 4×Φ22mm mounting holes are drilled; the top surface is finely turned to a flatness of ≤0.02mm, and the Tr200 deep 130mm inner threaded hole 211 is turned in the center area;

[0074] The threaded column 230 is turned by adopting a stepped shaft turning process, one end is processed with an outer thread matched with the platform connecting part 210, the other end is turned into a flange plate or directly forms the blank contact part 220;

[0075] Specifically, when machining the flange plate, take 40CrNiMo bar stock, drill center holes at both ends, rough turn the outer circle, finish turn the lower end to process external threads that match the internal threaded hole 211, high-frequency quench the threaded section to HRC 45-50, with a hardened layer depth of 1.5 mm, turn the flange plate at the upper end, open a ring-shaped T-shaped groove at the end face, with a parallelism of ≤0.015 mm between the groove bottom and the flange plate end face, then form the blank contact portion 220 by turning, and correspondingly turn out an insertion portion that cooperates with the ring-shaped T-shaped groove, and connect the two flange plates by bolts.

[0076] In other embodiments, instead of machining the flange plate, directly take 40CrNiMo bar stock, drill center holes at both ends, rough turn the outer circle, finish turn the lower end to process external threads that match the internal threaded hole 211, and turn the blank contact portion 220 at the upper end.

[0077] Turning the positioning hole 221: turn the positioning hole 221 on the surface of the blank contact portion 220;

[0078] Specifically, fix the blank contact portion 220 billet in the numerical control lathe, replace the drill bit according to the target hole diameter, pre-drill the center hole, and expand it to the target hole diameter for the second time, turn a 45°×2 mm chamfer at the hole mouth to reduce the entry resistance of the upset blank, and polish the chamfer surface.

[0079] Processing the ejection hole 222: process the ejection hole 222 and the communication groove on the blank contact portion 220, and process the ejector rod 510;

[0080] Specifically, drill the ejection hole 222 on the side surface of the blank contact portion 220 coaxially and in communication with the positioning hole 221, mark the hole position array of the inclined lane exhaust hole on the surface of the ejector rod 510, use an internal cooling drill bit, continuously blow away the chips with high-pressure argon gas (0.8 MPa), process 3 groups of inclined exhaust holes 511 (axial angle 15°±1°), and drill the main exhaust hole 512, side mill the connecting groove 231 at the connection between the threaded column 230 and the blank contact portion 220, and the connecting groove 231 communicates with the ejection hole 222.

[0081] Forming the limiting block 240: mill a wedge-shaped profile from a rectangular alloy steel block;

[0082] Specifically, take a 42CrMo rectangular block, mill a 7° wedge surface on a five-axis machining center, process the first sliding groove 321 with a carbide tool, and process the second sliding groove 212 on the platform connecting portion 210, laser quench the wedge surface, and polish the surface with a ceramic grinding wheel.

[0083] Composite assembly: screw the threaded column 230 into the platform connecting portion 210, and install the limiting block 240 in the gap between the blank contact portion 220 and the platform connecting portion 210.

[0084] Specifically, the threaded column 230 is screwed into the platform connecting part 210, the surface on the blank contacting part 220 is measured by a micrometer, the threaded column 230 is adjusted to make the parallelism ≤0.02mm / 100mm, the advancing bolt 420 is screwed after the limiting block 240 is embedded, the limiting block 240 fills the gap and contacts the blank contacting part 220, and the pressure is transmitted.

[0085] Specifically, the advancing bolt 420 is rotated forward and backward, the limiting block 240, the first matching block 320, the second matching block 330, the stop block 310 on the blank, and the platform connecting part 210 are matched, and the assembly is completed.

[0086] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, so: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A header die characterized by: The utility model relates to a forging die set, which comprises: an upper die (100) mounted on a forging press; a lower die (200) comprising a platform connecting part (210) connected to the forging press and an embryo contacting part (220) provided on the platform connecting part (210) and cooperating with the upper die (100) to upset the embryo, wherein the embryo contacting part (220) is provided with a positioning hole (221) for forming a positioning protrusion during the upsetting of the embryo; the lower die (200) further comprises: a threaded column (230) threadedly connected to the platform connecting part (210) and connecting the embryo contacting part (220); a limiting block (240) provided in the gap between the embryo contacting part (220) and the platform connecting part (210) to fill the gap and lock the height for supporting the embryo contacting part (220); the limiting block (240) is provided with a stop assembly (300), which comprises: a stop block (310) provided on one side of the embryo contacting part (220) close to the platform connecting part (210); a first matching block (320) provided on one side of the limiting block (240) close to the stop block (310) and provided with a first sliding groove (321) adapted to the stop block (310); a second matching block (330) radially sliding on the platform connecting part (210) and connected to the limiting block (240); the first matching block (320) can abut against one side of the embryo contacting part (220) away from the upper die (100), and the first matching block (320) is wedge-shaped; the limiting block (240) is provided with a pushing assembly (400), which comprises: a connecting plate (410) provided on the limiting block (240); a pushing bolt (420) provided on the connecting plate (410) and threadedly connected to the platform connecting part (210), wherein the head of the pushing bolt abuts against one end of the connecting plate (410) away from the platform connecting part (210); the first sliding groove (321) is divided into a sliding zone and a fastening zone in the vertical direction, the fastening zone is slidingly provided with a fastening block (340), the first matching block (320) is provided with a fastening bolt (350), the fastening block (340) is slidingly provided in the first sliding groove (321) through the fastening bolt (350), the fastening block (340) is provided with a wedge surface (341), the wedge surface (341) abuts against the stop block (310), and when the stop block (310) moves downward, the first matching block (320) is driven to move close to the middle part of the embryo contacting part (220).

2. The upsetter die of claim 1, wherein: the pushing assembly (400) further comprises an exit nut (430) provided on the pushing bolt (420) and located on one side of the connecting plate (410) close to the platform connecting part (210).

3. Upsetting die according to claim 1 or 2, characterized in that: The embryo piece contact part (220) is provided with an ejection hole (222) which communicates with the positioning hole (221), and an ejection rod (510) is slidably connected in the ejection hole (222); a communication groove which communicates with the ejection hole (222) is provided on the threaded column (230), and a force applying rod (520) is slidably arranged on the embryo piece contact part (220), and the force applying rod (520) cooperates with the ejection rod (510) to eject the embryo piece.

4. The upsetter die of claim 3, wherein: An exhaust hole is provided on the ejection rod (510) and communicates with the outside and the positioning hole (221).

5. A method of machining a header die as claimed in any one of claims 1 to 4, characterised in that: The method comprises the following steps: Turning the platform connecting part: machining a mounting surface connected with a forging press on a forged steel blank, and turning an inner threaded hole in a central area; Turning the threaded column: adopting a stepped shaft turning process, machining an outer thread at one end to match the platform connecting part, and turning a flange at the other end or directly forming an embryo piece contact part; Turning the positioning hole: turning and machining a positioning hole on the surface of the embryo piece contact part; Limiting block forming: milling a rectangular alloy steel block into a wedge-shaped profile; Composite assembly: rotating the threaded column into the platform connecting part, and installing the limiting block in the gap between the embryo piece contact part and the platform connecting part.

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