Upsetting die and die machining method

Abstract

The invention relates to the technical field of forging machine tool machining, in particular to an upsetting die and a die machining method. The lower die comprises a platform connecting part and a blank contact part, the platform connecting part is connected to a forging forming machine tool, the blank contact part is arranged on the platform connecting part, and the blank contact part is matched with the upper die to be used for blank upsetting; a positioning hole is formed in the blank contact part and used for forming a positioning protrusion in the blank upsetting process. The method comprises the steps of turning the platform connecting part, turning the threaded column, turning the positioning hole, forming the limiting block and compositely assembling. The device has the effect of facilitating follow-up machining and positioning.

Description

Technical Field

[0001] The present application relates to the technical field of forging machine tool processing, and in particular to a roughing die and a die processing method. Background Art

[0002] Currently, in the field of metal forging, upsetting is a key pretreatment step for improving workpiece strength. Traditionally, this process employs a two-step approach: first, the steel blank is upset to increase its density and roughness, facilitating subsequent finishing. The upset workpiece is then clamped in a specialized fixture and subjected to finish forging or multiple forging cycles to further enhance strength.

[0003] In the prior art, Chinese patent publication number CN208195540U proposes an adjustable upsetting die. The lower die height is adjusted by interlocking the threads of an adjustment screw and an adjustment nut. A clamping screw secures the lower die, while a support screw prevents thread damage. This solution solves the cumbersome issue of conventional backing plate replacement.

[0004] However, the surface of the fixed lower die is flat, and the die only has height adjustment, without an integrated positioning structure, so additional clamping is still required during precision forging; the lower die is an integral structure, and the positioning components cannot be quickly replaced according to the workpiece size; upsetting and precision forging are still independent processes, and the workpiece transfer causes the positioning reference to be lost. Summary of the Invention

[0005] The present application provides a roughing mold and a mold processing method, which can at least partially solve the above technical problems.

[0006] In the first aspect, the present application provides a roughing die, which adopts the following technical solution: A roughing mold, comprising: Upper die, installed on forging machine; The lower die includes a platform connecting part and a blank contact part. The platform connecting part is connected to the forging machine tool. The blank contact part is arranged on the platform connecting part. The blank contact part cooperates with the upper die for upsetting the blank. A positioning hole is opened on the blank contact part, and the positioning hole is used to form a positioning protrusion during the upsetting process of the blank.

[0007] By adopting the above technical solution, the upper die is fixed on the movable crossbeam of the forging machine, and the lower die is installed on the workbench through the platform connection part. The heated cylindrical blank is placed on the upper surface of the contact part of the blank, and the upper die is pressed downward to perform upsetting. The metal is forged into the positioning hole to form a convex structure; upsetting also forms a convexity, and in the subsequent fine forging process, the convex structure can be used as a positioning reference to reduce the movement of the blank in the subsequent fine forging process, thereby improving the effective hammering of the fine forging process, reducing the influence of the movement of the accessories on the blank processing, and eliminating the positioning error of the secondary clamping in the traditional process; the convex structure improves the anti-deviation ability of the workpiece during fine forging.

[0008] Optionally, the lower mold further includes: a threaded column, threadedly connected to the platform connecting portion and connected to the blank contact portion; A limiting block is provided in the gap between the blank contact portion and the platform connecting portion, filling the gap to lock the height, and is used to support the blank contact portion.

[0009] By adopting the above technical solution, the threaded column is rotated to adjust the height of the contact part of the blank (adapting to different upsetting ratios), and the limit block is inserted into the gap to lock the height; the limit block resists the impact load and prevents plastic deformation of the thread pair; and through the setting of the contact part of the blank, it is convenient to replace the lower mold of different positioning holes, which is convenient for upsetting blanks with different upsetting ratios and improving adaptability. The setting of the limit block reduces the force on the threaded column and reduces damage to the threaded column, so that the platform connection maintains its service life and reduces the replacement frequency.

[0010] Optionally, a stop assembly is provided on the limit block, and the stop assembly includes: A stop block is provided on a side of the blank contact portion close to the platform connection portion; A first matching block is provided on a side of the limit block close to the stop block and is provided with a first sliding groove adapted to the stop block; The second matching block slides on the platform connecting portion along the radial direction of the platform connecting portion and is connected to the limiting block.

[0011] By adopting the above technical solution, the stop block is welded to the bottom surface of the contact part of the blank, the first matching block is clamped to the stop block through the slide groove, and the second matching block radially moves to drive the limit block. During upsetting, the rotation of the contact part of the blank can be limited, and the damage to the threaded column caused by excessive forging pressure can be reduced. The second matching block maintains support for the contact part of the blank, so that the lower die is subjected to force as a whole and transmitted to the forging machine, reducing damage to the die.

[0012] Optionally, the first mating block can abut against a side of the blank contact portion away from the upper mold, and the first mating block is wedge-shaped.

[0013] By adopting the above technical solution, the wedge-shaped surface of the first mating block abuts against the contact part of the blank. As the first mating block moves, the supporting force on the contact part of the blank is enhanced, and the force of the upper mold can be stably maintained to be completely transmitted to the lower mold, and the force on the threaded column can be reduced. The greater the pressure of the upper mold, the stronger the abutment force between the wedge block and the contact part, thereby maintaining the stability of the mold during the upsetting process.

[0014] Optionally, a propulsion assembly is provided on the limit block, and the propulsion assembly includes: A connecting plate, arranged on the limiting block; A push bolt is passed through the connecting plate and is threadedly connected to the platform connecting portion, and a bolt head abuts against an end of the connecting plate away from the platform connecting portion.

[0015] By adopting the above technical solution, after completing the initial installation and tightening of the limit block, the first matching block supports the contact part of the blank by rotating and pushing the bolt, and by tightening the bolt, on the one hand, the difficulty of installing the limit block component can be reduced, and on the other hand, the sliding of the first matching block is more stable and the sliding force is greater, which facilitates the support of the contact part of the blank, provides convenience, and can maintain stability during upsetting.

[0016] Optionally, the propulsion assembly further includes a withdrawal nut, which is arranged on the propulsion bolt and is located on a side of the connecting plate close to the platform connecting portion.

[0017] By adopting the above technical solution, after upsetting or use, the withdrawal nut is brought into contact with the connecting plate, and then the advancing bolt is unscrewed, so that the unscrewing bolt drives the connecting plate and the first mating block to move away from the middle of the blank contact part, thereby releasing the support for the blank contact part, facilitating the replacement of the blank contact part with different positioning holes, shortening the replacement time, and improving the replacement and maintenance efficiency.

[0018] Optionally, an ejection hole is provided on the contact portion of the blank, the ejection hole is connected to the positioning hole, and an ejection rod is slidably connected in the ejection hole; a connecting groove connected to the ejection hole is provided on the threaded column, and a force rod is slidably provided on the contact portion of the blank, and the force rod cooperates with the ejection rod to eject the blank.

[0019] By adopting the above technical solution, after upsetting is completed, the blank may be stuck in the positioning hole, and the force rod is used to apply force to the ejection rod to facilitate the separation of the protrusion of the blank from the positioning hole, thereby improving the upsetting efficiency. If a second upsetting is performed, positioning can be performed by the protrusion, and then upsetting can be performed again to reduce the movement of the blank.

[0020] Optionally, an exhaust hole is provided on the ejection rod, and the exhaust hole is connected to the outside and the positioning hole.

[0021] By adopting the above technical solution, the gas is discharged through the positioning hole and the exhaust hole during upsetting, and the ejector rod also serves as a gas guide channel, reducing the porosity defect rate of the protruding part. In addition, the exhaust setting facilitates the forming of the protrusion and the pulling out of the protrusion, reducing the increased difficulty of pulling out caused by negative pressure.

[0022] Optionally, the first slide groove is divided into a sliding area and a fastening area along the vertical direction, the fastening area is provided with a fastening block, the first mating block is provided with a fastening bolt, the fastening block slides in the first slide groove through the fastening bolt, the fastening block is provided with a wedge surface, the wedge surface abuts against the stop block, and when the stop block moves downward, it drives the first mating block close to the middle of the contact part of the blank.

[0023] By adopting the above technical solution, the stop block moves downward to squeeze the wedge surface of the fastening block, and the wedge surface drives the first matching block to shrink toward the center, and the fastening bolt locks the sliding area; through the above setting, the rotation of the threaded column is reduced during the upsetting process, so that the vertical force of the lower die remains stable, and the force caused by the rotation of the threaded column is reduced. The deviation of the force toward the threaded column is reduced, thereby reducing damage to the threaded column.

[0024] In a second aspect, the present application provides a mold processing method, which adopts the following technical solution: A mold processing method comprises the following steps: Turning platform connection part: the mounting surface for connecting to the forging machine is machined on the forged steel billet, and the internal threaded hole is turned in the center area; Turning threaded column: Using stepped shaft turning technology, one end is machined with external thread to match the platform connection part, and the other end is turned into a flange or directly forms the blank contact part; Positioning hole turning: Positioning holes are formed by turning on the contact surface of the blank; Limit block forming: a rectangular alloy steel block is milled into a wedge-shaped profile; Composite assembly: screw the threaded column into the platform connection part, and install the limit block in the gap between the blank contact part and the platform connection part.

[0025] By adopting the above technical solution, the components are turned in stages and then assembled, which facilitates the simultaneous processing of the components. The turning method enables the components to fit together perfectly and be easy to install and use.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The upsetting process simultaneously forms a bulge, which can be used as a positioning reference during the subsequent fine forging process. This reduces the movement of the blank during the subsequent fine forging process, improves the effective hammering during the fine forging process, reduces the impact of accessory movement on the blank processing, and eliminates the positioning error caused by secondary clamping in traditional processes. The bulge structure improves the workpiece's anti-drifting ability during fine forging. 2. It is easy to replace the lower die with different positioning holes, which is convenient for upsetting blanks with different upsetting ratios, improving adaptability. The setting of the limit block reduces the force on the threaded column and reduces damage to the threaded column, thereby maintaining the service life of the platform connection and reducing the replacement frequency. 3. The stop block moves downward to squeeze the wedge surface of the fastening block, which drives the first mating block to retract toward the center, locking the sliding area with the fastening bolt. This arrangement reduces the rotation of the threaded column during upsetting, keeping the vertical force on the lower die stable. This reduces the force shift toward the threaded column due to threaded column rotation, thereby minimizing damage to the threaded column. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is the overall structural diagram of the mold in Example 1 of the present application; Figure 2 is a cross-sectional view of the mold in Example 1 of the present application; Figure 3 This is the overall structural diagram of the mold in Example 2 of the present application; Figure 4 is a cross-sectional view of the mold in Example 2 of the present application; Figure 5 yes Figure 4 A partial enlarged view of the middle area A; Figure 6 This is a diagram showing the first matching block in Example 2 of the present application; Figure 7 This is a diagram showing the main exhaust hole in Example 2 of the present application.

[0028] Figure markings: 100, upper mold; 200, lower mold; 210, platform connecting part; 211, internal threaded hole; 212, second slide groove; 220, blank contact part; 221, positioning hole; 222, ejection hole; 230, threaded column; 231, connecting groove; 240, limit block; 300, stop assembly; 310, stop block; 320, first matching block; 321, first slide groove; 330, second matching block; 340, fastening block; 341, wedge surface; 350, fastening bolt; 400, pushing assembly; 410, connecting plate; 420, pushing bolt; 430, withdrawal nut; 510, ejector rod; 511, oblique exhaust hole; 512, main exhaust hole; 513, inclined surface; 520, force rod. DETAILED DESCRIPTION

[0029] The following combination Figures 1 to 7 This application is described in further detail.

[0030] This embodiment discloses an upsetting die.

[0031] Example 1: Reference Figure 1 and Figure 2 The upsetting die is mainly composed of an upper die 100 and a lower die 200. The upper die 100 is connected to the forging force end of the forging machine, and the lower die 200 is connected to the workbench of the forging machine. A positioning hole 221 is formed on the lower die 200. When upsetting, the heated blank is placed on the lower die 200, and the upper die 100 is driven to slide by the forging machine. The upper die 100 applies force to the blank, causing the blank to deform, and part of the blank structure protrudes into the positioning hole 221 to form a protruding structure for subsequent fine forging or positioning and fixation of other processes.

[0032] The upper die 100 is fixed to the movable crossbeam of the forging machine via a flange, while the lower die 200 comprises a platform connection portion 210, a threaded column 230, a blank contact portion 220, and a stop block 240. The platform connection portion 210 is bolted to the machine table, with an internal threaded hole 211 machined in its center. The lower end of the threaded column 230 is screwed into the internal threaded hole 211, and the upper end is welded or integrally formed to form the blank contact portion 220. A positioning hole 221 is provided on the top surface of the blank contact portion 220, forming a height-adjustable gap between the blank contact portion 220 and the platform connection portion 210. The stop block 240 fills the gap and abuts the two to achieve height locking. During forging, a protrusion is formed in the positioning hole 221 on the metal blank, which serves as a positioning reference for subsequent precision forging.

[0033] The depth to which the threaded stud 230 is screwed into the platform connection 210 determines the size of the gap (adapting to different upset ratios). To resist forging impact, a stopper 240 is inserted into the gap. Its rectangular body, with its top and bottom surfaces precision-ground, ensures full contact with the bottom surface of the blank contact portion 220 and the top surface of the platform connection 210.

[0034] The implementation principle of this embodiment 1 is: screw the threaded column 230 into the platform connecting part 210, select the height of the limit block 240 according to the needs, place the limit block 240 in the gap between the platform connecting part 210 and the blank contact part 220, rotate the threaded column 230 so that the blank contact part 220 presses the limit block 240 against the platform connecting part 210, and during the upsetting process, the force applied by the upper die 100 to the lower die 200 is transmitted to the worktable of the forging machine through the lower die 200.

[0035] Example 2: Reference Figures 3 to 7The difference between this embodiment and embodiment 1 is that, in order to increase the stability of the embryo contact portion 220 and reduce the probability of rotation of the embryo contact portion 220, a stop assembly 300 is provided on the limit block 240, and 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 to the side wall of the embryo contact portion 220 close to the platform connection portion 210. Correspondingly, the first matching block 320 is integrally formed on the side of the limit block 240 facing the stop block 310. A first sliding groove 321 is provided on the side wall of the first matching block 320 close to the stop block 310. One end of a slide groove 321 passes through the first matching block 320 to facilitate the sliding in of the stop block 310. The stop block 310 can slide in the first slide groove 321, and the side wall of the first matching block 320 away from the limit block 240 can abut against the blank contact part 220; the second matching block 330 is integrally formed on the side wall of the limit block 240 away from the first matching block 320, and a second slide groove 212 is correspondingly opened on the platform connecting part 210. The opening direction of the second slide groove 212 and the first slide groove 321 are consistent, and both are opened along the radial direction of the blank contact part 220. The second matching block 330 is slidably connected in the second slide groove 212.

[0036] Furthermore, to increase the support force on the blank contact portion 220 during the sliding of the first mating block 320, the contact surface between the first mating block 320 and the blank contact portion 220 is formed into a 7° wedge shape, with its inclined surface 513 contacting the bottom surface of the blank contact portion 220. When the upper die 100 is pressed downward, the wedge-shaped surface supports the blank contact portion 220, allowing the forging force to be transmitted to the platform connection portion 210 through the stop block 240, thereby improving forging stability.

[0037] Furthermore, in order to facilitate the advancement of the limit block 240, a propulsion assembly 400 is provided on the limit block 240, and the propulsion assembly 400 includes a connecting plate 410 and a propulsion bolt 420. The connecting plate 410 is integrally formed or welded on the limit block 240, and the connecting plate 410 extends to the side of the second mating block 330 away from the first mating block 320. A rotating hole is provided on the connecting plate 410, and the propulsion bolt 420 is passed through the rotating hole of the connecting plate 410 and can rotate in the rotating hole. The bolt head of the propulsion 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 propulsion bolt 420 is threadedly connected to the platform connecting portion 210; when the propulsion bolt 420 is tightened, its head abuts against the surface of the connecting plate 410, pushing the limit block 240 to move toward the center of the blank contact portion 220, eliminating the assembly gap.

[0038] Furthermore, in order to facilitate the limit block 240 to move away from the threaded column 230, a withdrawal nut 430 is threadedly connected to the push bolt 420, and the withdrawal nut 430 can abut against the side wall of the connecting plate 410 away from the bolt head. The position of the withdrawal nut 430 can be adjusted according to usage needs, and a locking bolt is threadedly connected to the push nut, and the locking bolt can abut against the push bolt 420; when the limit block 240 is withdrawn, the withdrawal nut 430 can be rotated to drive the connecting plate 410 to slide, or the locking bolt can be locked, and the push bolt 420 can be rotated to cause the withdrawal nut 430 to abut against the connecting plate 410 away from the platform connection part 210.

[0039] Furthermore, in order to facilitate the withdrawal of the protruding structure formed on the blank at the positioning hole 221 , an ejection hole 222 is provided inside the blank contact portion 220 , which is coaxially connected to the positioning hole 221 . An ejector rod 510 is provided in the ejector hole 222. The ejector rod 510 slides in the ejector hole 222 with a clearance of H7 / g6. An exhaust hole is provided on the ejector rod 510. A plurality of exhaust holes are provided and include an oblique exhaust hole 511 and a main exhaust hole 512. A plurality of oblique exhaust holes 511 are drilled on the side wall of the ejector rod 510. The plurality of oblique exhaust holes 511 are arranged at equal intervals along the circumference of the ejector rod 510, and the oblique exhaust holes 511 of the ejector rod 510 are located in the positioning hole 221; the main exhaust hole 512 is provided at the axis of the ejector rod 510 and extends to the end of the ejector rod 510 away from the blank. The main exhaust hole 512 is connected to the oblique exhaust hole 511, and the ejector rod 510 is away from the blank. A slope 513 is provided at one end of the blank, and the slope 513 passes through the main exhaust hole 512. A connecting groove 231 is provided at the connection between the blank contact part 220 and the threaded column 230. The connecting groove 231 is connected to the ejection hole 222 and is connected to the exhaust hole through the slope 513, so that the exhaust hole connects the positioning hole 221 and the outside; the blank contact part 220 is slidingly connected or detachably connected to the side wall near the platform connection part 210. The force rod 520 can be extended into the connecting groove and abut against the slope 513. When demolding, the force rod 520 is knocked, and the force rod 520 pushes the ejection rod 510 upward through the slope 513. The ejection rod 510 lifts the protruding part of the blank, and at the same time the exhaust hole eliminates negative pressure adsorption.

[0040] Furthermore, to enhance the support provided by the stop block 240 on the blank contact portion 220, the first slot 321 on the first mating 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 into the fastening area. A wedge-shaped fastening block 340 is embedded in the fastening area. The sidewall of the fastening block 340, adjacent to the stop block 310, is provided with a wedge surface 341 that abuts the bottom surface of the stop block 310, and the fastening block 340 is able to slide along the direction of the first slot 321. A fastening bolt 350 is provided on the outside of the first mating block 320. The fastening bolt 350 is threadedly connected to the first mating block 320 and is rotatably connected to the fastening block 340. As the fastening bolt 350 rotates, the fastening block 340 slides within the fastening area. When the forging lower stop block 310 moves downward, it squeezes the wedge surface 341 of the fastening block 340. The downward force pushes the fastening block 340 to drive the first matching block 320 to move toward the middle of the blank contact part 220, so that the wedge-shaped surface of the first matching block 320 slides, increasing the supporting force on the blank contact part 220 and achieving zero-gap locking.

[0041] The implementation principle of this embodiment 2 is as follows: screw the threaded column 230 into the platform connecting part 210 to the target height, embed the limit block 240, and the second matching block 330 slides into the second slide groove 212. The first slide groove 321 of the first matching block 320 contacts the stop block 310, pushing the limit block 240, so that the stop block 310 slides in the first slide groove 321, and tightens the push bolt 420 to eliminate the gap; the heated blank is placed on the blank contact part 220, the upper mold 100 is pressed down, and the squeezed part of the blank enters the positioning hole 221 to form a bulge, and the gas is discharged through the exhaust hole.

[0042] When the blank is taken out, the force-applying rod 520 is struck, and the force-applying rod 520 drives the ejection rod 510 to move upward, and the ejection rod 510 pushes the protruding structure of the blank out of the positioning hole 221 .

[0043] When replacing the blank contact part 220 with a different positioning hole 221, unscrew the push bolt 420, tighten the withdrawal nut 430 to push out the connecting plate 410, so that the limit block 240 is away from the threaded column 230, then remove the limit block 240, rotate the threaded column 230 in the opposite direction, and replace the blank contact part 220 with a positioning hole 221 with a different aperture.

[0044] The present application facilitates the formation of a raised structure in the blank through the provision of the positioning hole 221. The raised structure causes the precision forging to be offset, the limit block 240 shares the impact load, and the life of the threaded pair is extended; the exhaust hole design reduces the pore defect rate and facilitates the formation of the raised structure; the replacement time of the modular blank contact part 220 is shortened, and the forging height can be adjusted by adjusting the height of the blank contact part 220.

[0045] The embodiment of the present application also discloses a mold processing method.

[0046] The mold processing method comprises the following steps: Turning platform connection part 210: a mounting surface for connecting to the forging machine is machined on the forged steel billet, and an internal threaded hole 211 is turned in the center area; Specifically, a 45# forged steel billet was selected and tempered to HRC28-32. The billet was clamped on a vertical lathe, the bottom surface was rough-turned to Ra3.2μm, and 4×Φ22mm mounting holes were drilled. The top surface flatness was fine-turned to ≤0.02mm, and a Tr200 deep 130mm internal threaded hole 211 was turned in the center area. Turning the threaded column 230: Using a stepped shaft turning process, one end is machined with an external thread to match the platform connection part 210, and the other end is turned into a flange or directly formed into the blank contact part 220; Specifically, when processing the flange, take 40CrNiMo bar material, drill center holes at both ends, rough-turn the outer circle, and fine-turn the lower end to machine the external thread that matches the internal thread hole 211. The threaded section is high-frequency quenched to HRC45-50, with a hardened layer depth of 1.5mm. The flange is turned on the upper end, and an annular T-slot is opened on the end face. The parallelism between the groove bottom and the flange end face is ≤0.015mm. Then, the blank contact portion 220 is formed by turning, and the corresponding insertion portion that matches the annular T-slot is turned out, and the two flanges are connected by bolts. In other embodiments, instead of machining flanges, 40CrNiMo rods are directly taken, center holes are drilled at both ends, the outer circle is rough-turned, the lower end is fine-turned to form an external thread that matches the internal threaded hole 211, and the upper end is turned to form the blank contact portion 220.

[0047] Turning of positioning hole 221: Turning and forming positioning hole 221 on the surface of blank contact portion 220; Specifically, the blank of the blank contact part 220 is fixed on a CNC lathe, the drill bit is replaced according to the target hole diameter, the center hole is pre-drilled, the hole is expanded to the target hole diameter for the second time, a 45°×2mm chamfer is turned at the hole mouth to reduce the entry resistance of the roughened blank, and the chamfered surface is polished.

[0048] Processing of ejector hole 222: Processing of ejector hole 222 and connecting groove on blank contact portion 220, and processing of ejector rod 510; Specifically, an ejection hole 222 is drilled on the side of the blank contact part 220, which is coaxial and connected to the positioning hole 221. The hole array of the inclined exhaust hole is marked on the surface of the ejector rod 510. An internal cooling drill bit and high-pressure argon gas (0.8 MPa) are used for continuous chip blowing. Three groups of inclined exhaust holes 511 (axis angle 15°±1°) are processed, and the main exhaust hole 512 is drilled. A connecting groove 231 is milled on the side at the connection between the threaded column 230 and the blank contact part 220, and the connecting groove 231 is connected to the ejection hole 222.

[0049] Forming of the limit block 240: milling a wedge-shaped profile out of a rectangular alloy steel block; Specifically, a 7° wedge surface was milled from a 42CrMo rectangular block on a five-axis machining center. A carbide tool was used to machine the first slide groove 321 , and a second slide groove 212 was machined on the platform connection portion 210 . The wedge surface was laser quenched and the surface was polished with a ceramic grinding wheel.

[0050] 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 .

[0051] Specifically, screw the threaded column 230 into the platform connecting part 210, use a micrometer to measure the upper plane of the blank contact part 220, adjust the threaded column 230 so that the parallelism is ≤0.02mm / 100mm, embed the limit block 240 and tighten the push bolt 420 so that the limit block 240 fills the gap and contacts the blank contact part 220 to transmit pressure.

[0052] Specifically, by pushing the bolt 420 forward and reversely, the limiting block 240, the first matching block 320, the second matching block 330 are driven to match with the stop block 310 on the blank and the platform connecting portion 210 to complete the assembly.

[0053] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A roughing mold, characterized in that: include: An upper die (100) is mounted on a forging machine; The lower die (200) comprises a platform connecting portion (210) and a blank contact portion (220), wherein the platform connecting portion (210) is connected to a forging machine, and the blank contact portion (220) is arranged on the platform connecting portion (210). The blank contact portion (220) cooperates with the upper die (100) for blank upsetting; a positioning hole (221) is provided on the blank contact portion (220), and the positioning hole (221) is used to form a positioning protrusion during the blank upsetting process.

2. The roughing mold according to claim 1, characterized in that: The lower mold (200) further includes: A threaded column (230) is threadedly connected to the platform connection portion (210) and connected to the blank contact portion (220); A limit block (240) is provided in the gap between the blank contact portion (220) and the platform connection portion (210), filling the gap to lock the height, and is used to support the blank contact portion (220).

3. The roughing mold according to claim 2, characterized in that: A stop assembly (300) is provided on the limit block (240), and the stop assembly (300) comprises: A stop block (310) is provided on a side of the blank contact portion (220) close to the platform connection portion (210); A first matching block (320) is arranged on a side of the limiting block (240) close to the stop block (310) and is provided with a first sliding groove (321) adapted to the stop block (310); The second matching block (330) slides on the platform connecting portion (210) along the radial direction of the platform connecting portion (210) and is connected to the limiting block (240).

4. The roughing mold according to claim 3, characterized in that: The first matching block (320) is capable of abutting against a side of the blank contact portion (220) away from the upper mold (100), and the first matching block (320) is wedge-shaped.

5. The upsetting mold according to claim 4, characterized in that: A propulsion assembly (400) is provided on the limiting block (240), and the propulsion assembly (400) comprises: A connecting plate (410) is provided on the limiting block (240); A push bolt (420) is passed through the connecting plate (410) and is threadedly connected to the platform connecting portion (210), and a bolt head abuts against an end of the connecting plate (410) away from the platform connecting portion (210).

6. The roughing mold according to claim 5, characterized in that: The propulsion assembly (400) further includes a withdrawal nut (430), which is arranged on the propulsion bolt (420) and is located on a side of the connecting plate (410) close to the platform connecting portion (210).

7. The upsetting mold according to any one of claims 2 to 6, characterized in that: An ejection hole (222) is provided on the blank contact portion (220), the ejection hole (222) is communicated with the positioning hole (221), and an ejection rod (510) is slidably connected in the ejection hole (222); a connecting groove is provided on the threaded column (230) and is communicated with the ejection hole (222), a force rod (520) is slidably provided on the blank contact portion (220), and the force rod (520) cooperates with the ejection rod (510) to eject the blank.

8. The upsetting mold according to claim 7, characterized in that: An exhaust hole is provided on the ejection rod (510), and the exhaust hole is connected to the outside and the positioning hole (221).

9. The upsetting mold according to claim 3, characterized in that: The first slide groove (321) is divided into a sliding area and a fastening area along the vertical direction. The fastening area is provided with a fastening block (340). The first matching block (320) is provided with a fastening bolt (350). The fastening block (340) slides in the first slide 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). When the stop block (310) moves downward, it drives the first matching block (320) close to the middle of the blank contact portion (220).

10. A mold processing method for processing the upsetting mold according to any one of claims 1 to 9, characterized in that: The following steps are involved: Turning platform connection part: the mounting surface for connecting to the forging machine is machined on the forged steel billet, and the internal threaded hole is turned in the center area; Turning threaded column: Using stepped shaft turning technology, one end is machined with external thread to match the platform connection part, and the other end is turned into a flange or directly forms the blank contact part; Positioning hole turning: Positioning holes are formed by turning on the contact surface of the blank; Limit block forming: a rectangular alloy steel block is milled into a wedge-shaped profile; Composite assembly: screw the threaded column into the platform connection part, and install the limit block in the gap between the blank contact part and the platform connection part.

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