A continuous forging die for crankshaft forgings and its forging process

Abstract

This invention discloses a continuous forging die for crankshaft forgings, comprising an upper die base, on the bottom surface of which a primary forging die, a final forging die, and a trimming die are arranged at equal intervals along a first direction, all of which are slidably connected to the upper die base along the first direction; a lower die base, on the top surface of which a primary forging die, a final forging die, and a trimming die are arranged at equal intervals along the first direction; a stamping part, on which both the upper and lower die bases are mounted; and a rotating component, on which both the upper and lower die bases are connected to the stamping part via a horizontal rotating component. This invention controls the vertical movement of the upper and lower die bases via the rotating component, while simultaneously coordinating with the translational movement of the primary forging die, final forging die, and trimming die along the first direction. This allows the crankshaft forging to automatically move forward between dies in different processes without the need for clamps, reducing the probability of crankshaft forging deformation and improving production efficiency through continuous forging. This invention also discloses a forging process for crankshaft forgings.

Description

Technical Field

[0001] This invention belongs to the field of crankshaft forging technology, and particularly relates to a continuous forging die for crankshaft forgings and its forging process. Background Technology

[0002] The crankshaft is a widely used component in engines. Its simple and practical structure effectively reduces overall vehicle vibration in cars and motorcycles, improving driving comfort. The balance shaft is essentially a shaft equipped with an eccentric weight, also called a counterweight, that rotates synchronously with the crankshaft. It utilizes the reverse vibration force generated by the eccentric weight to achieve good engine balance and reduce engine vibration.

[0003] The existing crankshaft forging process includes three steps: preliminary forging, final forging, and trimming. Preliminary forging requires a preliminary forging die to initially shape the crankshaft forging; final forging requires a final forging die to finalize the crankshaft forging; and trimming requires a trimming die to remove the flash from the crankshaft forging. Since each of these three steps requires a different die, in actual operation, a clamp is needed to hold the crankshaft forging and move it into different dies for processing. Because crankshaft forgings typically require heating to achieve a lower hardness for shaping, deformation can easily occur during clamping, affecting the quality of the final product. Furthermore, repeatedly gripping the crankshaft forging with a single clamp consumes more time, impacting production efficiency.

[0004] Therefore, it is necessary to improve the existing crankshaft forging dies. Summary of the Invention

[0005] One of the objectives of this invention is to overcome the deficiencies in the prior art and provide a continuous forging die for crankshaft forgings, which improves the quality of finished crankshaft forgings and increases the efficiency of forging crankshaft forgings using the forging die.

[0006] To achieve the above objectives, the specific technical solution of the crankshaft forging continuous forging die of the present invention is as follows:

[0007] A continuous forging die for crankshaft forgings and its forging process include an upper die base, on the bottom surface of which a primary forging die, a final forging die, and a trimming die are arranged at equal intervals along a first direction, and the primary forging die, the final forging die, and the trimming die are all slidably connected to the upper die base along the first direction; a lower die base, on the top surface of which a primary forging die, a final forging die, and a trimming die are arranged at equal intervals along the first direction; a stamping part, on which the upper die base and the lower die base are both disposed, and the stamping part controls the closing and opening of the upper die base and the lower die base; and a rotating component, on which the upper die base and the lower die base are both connected to the stamping part via a horizontal rotating component, and the horizontal rotating component controls the upper die base and the lower die base to rotate synchronously around the same horizontal axis.

[0008] Preferably, in order to achieve positioning between the upper and lower die bases and simultaneously push the upper and lower die bases to open the mold, the stamping part includes a vertically arranged guide post. The top and bottom ends of the guide post are respectively connected to a top seat and a base. The guide post is slidably connected to a lifting seat. The top seat is fixedly connected to a hydraulic cylinder that is pulsatorically connected to the lifting seat. The upper die base and the lower die base are both disposed between the lifting seat and the base. An elastic reset member is disposed between the upper die base and the lower die base.

[0009] Preferably, in order to limit the upper and lower mold bases and enable them to flip and interchange positions, the bottom surface of the lifting seat and the top surface of the base are both provided with recesses. The upper and lower mold bases are respectively disposed inside the two recesses. When the upper and lower mold bases are closed, the two recesses combine to form a cylindrical cavity with a horizontally extending axis and open ends. The upper and lower mold bases are slidably connected to the inner wall of the cavity. The trimming lower mold has a blanking channel for the crankshaft forging to pass through. The lower mold base is provided with a second blanking port communicating with the blanking channel. The base is provided with a first blanking port communicating with the second blanking port.

[0010] Preferably, in order to provide power for the up-and-down rotation of the upper mold base and the lower mold base, the rotating component includes two arc-shaped racks fixedly connected to the upper mold base and the lower mold base respectively, and a rotating power unit fixedly connected to the lifting seat or the base. When the upper mold base and the lower mold base are closed, the ends of the two racks are joined together to form an annular structure coaxially arranged with the cavity. The rotating power unit is connected to the racks in a transmission connection.

[0011] Preferably, in order to improve the stability of the upper mold base and the lower mold base, the top surface of the upper mold base and the bottom surface of the lower mold base are both arc surfaces that are in close contact with the inner side wall of the cavity. The elastic reset member includes a slide rod fixedly connected to the upper mold base, a slide sleeve fixedly connected to the lower mold base, and a spring disposed inside the slide sleeve. The slide rod slides in cooperation with the slide sleeve, and the two ends of the spring are respectively connected to the slide rod and the lower mold base.

[0012] Preferably, in order to improve the stability of the installation of the upper mold base and the lower mold base, the inner wall of the recess is provided with a guide groove. When the upper mold base and the lower mold base are closed, the two guide grooves combine to form an annular groove coaxially arranged with the cavity, and the rack slides in cooperation with the guide groove.

[0013] Preferably, in order to realize the translation of the initial forging upper die, the final forging upper die, and the trimming upper die, a translation seat is slidably provided on the bottom surface of the upper die base. The initial forging upper die, the final forging upper die, and the trimming upper die are all fixedly connected to the translation seat. The upper die base is provided with a translation force part for driving the translation seat to slide along a first direction.

[0014] Preferably, in order to position the upper mold base and the lower mold base, both the lifting base and the base are provided with electromagnets, and the end of the upper mold base or the lower mold base is provided with a magnetic block, which is attracted to one of the electromagnets.

[0015] The second objective of this invention is to provide a forging process for crankshaft forgings, comprising the following steps:

[0016] Step 1: Mold closing. The upper and lower molds of the initial forging process are closed to perform initial forging on the first billet. The upper and lower molds of the final forging process are closed to perform final forging on the second billet. The upper and lower molds of the trimming process are closed to trim the edge of the third billet. The trimmed third billet is discharged from the blanking channel.

[0017] Step 2: Flip over. With the mold closed, flip over the upper mold base and the lower mold base to swap their positions.

[0018] Step 3: Mold opening. The upper and lower molds of the initial forging open, leaving the first billet inside the upper mold. The upper and lower molds of the final forging open, leaving the second billet inside the upper mold. The upper and lower molds of the trimming edge open.

[0019] Step 4: Translation. The initial forging upper die, the final forging upper die, and the trimming upper die are translated along the first direction so that the initial forging upper die is aligned with the final forging lower die, and the final forging upper die is aligned with the trimming lower die.

[0020] Step 5: Secondary mold closing, the initial forging upper mold and the final forging lower mold are closed, the final forging upper mold and the trimming lower mold are closed, and the initial forging lower mold and the trimming upper mold are in the open mold state;

[0021] Step 6: Reverse and reset. In the secondary mold closing state, reverse the upper mold base and the lower mold base to reset them.

[0022] Step 7: Secondary mold opening, the initial forging upper mold and the final forging lower mold open, allowing the first billet to enter the final forging lower mold, the final forging upper mold and the trimming lower mold close, allowing the second billet to enter the trimming lower mold, and a new billet is placed in the initial forging lower mold;

[0023] Step 8: Translation and reset. The initial forging upper die, the final forging upper die, and the trimming upper die are translated along the first direction so that the initial forging upper die is aligned with the initial forging lower die, the final forging upper die is aligned with the final forging lower die, and the trimming upper die is aligned with the trimming lower die.

[0024] Step 9: Repeat steps 1 through 2.

[0025] The crankshaft forging continuous forging die and its forging process of the present invention have the following advantages: by controlling the upper and lower die holders to flip up and down through the rotating component, and cooperating with the initial forging upper die, final forging upper die and trimming upper die to translate along the first direction, the crankshaft forging can be automatically transported and moved forward between dies of different processes without the need for grippers, which reduces the probability of crankshaft forging deformation, improves the finished quality of crankshaft forging, and improves production efficiency by continuously forging crankshaft forging. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the forging die of the present invention in the open state;

[0027] Figure 2 This is a schematic diagram of the forging die in the closed state according to the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the translation seat after it has been moved according to the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of the stamped part of the present invention;

[0030] Figure 5 This is a cross-sectional view of the stamped part of the present invention;

[0031] Figure 6 This is a schematic diagram of the upper mold base and lower mold base in the mold-closing state of the present invention;

[0032] Figure 7This is a schematic diagram of the upper and lower mold bases in the mold-opening state of the present invention;

[0033] Figure 8 This is a cross-sectional view of the upper and lower mold bases of the present invention in the mold-opening state;

[0034] Figure 9 This is a schematic diagram of the connection structure between the upper mold base and the translation base of the present invention;

[0035] Figure 10 This is a schematic diagram of the upper mold base of the present invention;

[0036] Figure 11 This is a schematic diagram of the translation seat of the present invention;

[0037] Figure 12 This is a schematic diagram of the connection structure between the base and the lower mold base of the present invention;

[0038] Figure 13 This is a process step diagram of the crankshaft forging process of the present invention;

[0039] Explanation of markings in the diagram: 101, Hydraulic cylinder; 102, Top seat; 103, Lifting seat; 104, Guide pillar; 105, Base; 106, Groove; 107, Rotary power unit; 108, First material drop port; 109, Notch; 110, Electromagnet; 111, Guide groove; 201, Upper mold base; 202, Translational power unit; 203, Translational seat; 204, Rack; 205, Magnetic block. 206. Slide bar; 207. Trimming upper die; 208. Final forging upper die; 209. Initial forging upper die; 210. Positioning groove; 211. Slide groove; 212. Slider; 213. Positioning bar; 301. Lower die base; 302. Sliding sleeve; 303. Second blanking port; 304. Initial forging lower die; 305. Final forging lower die; 306. Trimming lower die; 307. Spring; 308. Blanking channel. Detailed Implementation

[0040] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0041] The terms "top surface," "bottom surface," and "full surface" refer to the normal operating state of the crankshaft forging die and are used only for the purpose of describing the invention and simplifying the description. They are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0042] Crankshaft forging typically involves three steps: preliminary forging, final forging, and trimming. Each step requires a corresponding mold. Therefore, after one forging step is completed, existing technology usually uses grippers or other clamping tools to move the crankshaft forging into the mold for the next step. However, because crankshaft forgings are usually heated to reduce their hardness during the forging process to facilitate forming, the forging is prone to deformation during gripping, affecting the quality of the finished product. Furthermore, using a single gripper requires clamping the crankshaft forging from the preliminary forging to the final forging mold, and then from the final forging to the trimming mold, requiring two clamping operations, which reduces production efficiency. Using multiple grippers would increase costs.

[0043] To solve the above problems, such as Figures 1-12 As shown, a continuous forging die for crankshaft forgings includes an upper die base 201. A primary forging upper die 209, a final forging upper die 208, and a trimming upper die 207 are arranged at equal intervals along a first direction on the bottom surface of the upper die base 201. The primary forging upper die 209, the final forging upper die 208, and the trimming upper die 207 are all slidably connected to the upper die base 201 along the first direction. A lower die base 301 has a top surface arranged at equal intervals along the first direction. The components include a primary forging die 304, a final forging die 305, and a trimming die 306; a stamping part, with an upper die holder 201 and a lower die holder 301 both mounted on the stamping part, and the upper die holder 201 and the lower die holder 301 are controlled to close and open the die through the stamping part; a rotating component, with the upper die holder 201 and the lower die holder 301 both connected to the stamping part through a horizontal rotating component, and the horizontal rotating component controls the upper die holder 201 and the lower die holder 301 to rotate synchronously around the same horizontal axis.

[0044] When the forging die is in use, the initial forging upper die 209 and the initial forging lower die 304 are used to perform initial forging of the crankshaft forging, the final forging upper die 208 and the final forging lower die 305 are used to perform final forging of the crankshaft forging, and the trimming upper die 207 and the trimming lower die 306 are used to remove the flash of the crankshaft forging after final forging.After the first die-closing stamping is completed, a crankshaft forging after preliminary forging exists between the initial forging upper die 209 and the initial forging lower die 304, and a crankshaft forging after final forging exists between the final forging upper die 208 and the final forging lower die 305. The crankshaft forging after the flash is removed between the trimming upper die 207 and the trimming lower die 306 falls out through the blanking channel 308 of the trimming lower die 306. The removed flash remains between the trimming upper die 207 and the trimming lower die 306. Therefore, no crankshaft forging remains between the trimming upper die 207 and the trimming lower die 306. Afterwards, in the die-closing state, the upper die holder 201 and the lower die holder 301 are flipped to exchange positions before the die is opened. This allows the crankshaft forging after preliminary forging to remain inside the initial forging upper die 209 under gravity, and the crankshaft forging after final forging... Under the influence of gravity, the forging remains inside the final forging upper die 208, and the cut flash remains at the trimming upper die 207. Then, the initial forging upper die 209, the final forging upper die 208, and the trimming upper die 207 translate along the first direction, aligning the initial forging upper die 209 with the final forging lower die 305, and aligning the final forging upper die 208 with the trimming lower die 306. The dies are then closed again, causing the initial forging upper die 209 and the final forging lower die 305 to close together, and the final forging upper die 208 and the trimming lower die 306 to close together. Simultaneously, the trimming upper die 207 and the initial forging lower die 304 are in the open state. Then, in the closed state, the upper die holder 201 and the lower die holder 301 are flipped, resetting them to their original positions. At this time, the trimming upper die 207 is positioned above. When die 207 is in the open state, the flash remaining on the trimming die 207 falls off under gravity, achieving automatic flash removal and improving production efficiency. Simultaneously, the initial forging die 304 rotates downwards and is in the open state, allowing new crankshaft forging blanks to be placed on the initial forging die 304. Then, the initial forging die 209 and the final forging die 305, as well as the final forging die 208 and the trimming die 306, open. The crankshaft forgings previously forged in the initial stage are transferred to the final forging die 305, while those previously forged in the final stage are transferred to the trimming die 306. Afterwards, the initial forging die 209, the final forging die 208, and the trimming die 207 are translated and reset along the first direction. After these steps, all dies return to their original positions. The process returns to its initial position, with the initial forging upper die 209 positioned directly above the initial forging lower die 304, the final forging upper die 208 positioned directly above the final forging lower die 305, and the trimming upper die 207 positioned directly above the trimming lower die 306. At this point, new crankshaft forging blanks are filled between the initial forging upper die 209 and the initial forging lower die 304. The crankshaft forgings from both the initial and final forging processes are moved to the next stage. By repeating these steps, automated continuous production line forging of crankshaft forgings is achieved, improving forging efficiency. Furthermore, the forgings are supported by the dies during transfer to the next forging stage. Because the shape of the die cavity matches the shape of the forging, the crankshaft forgings do not deform during transfer, ensuring the quality of the finished crankshaft forgings.

[0045] Further improvements include, for example Figures 1-5 As shown, the stamping part includes a vertically arranged guide post 104. The top and bottom ends of the guide post 104 are respectively connected to the top seat 102 and the base 105. The guide post 104 is slidably connected to the lifting seat 103. The top seat 102 is fixedly connected to a hydraulic cylinder 101 that is pulsatorically connected to the lifting seat 103. The upper die seat 201 and the lower die seat 301 are both disposed between the lifting seat 103 and the base 105. An elastic reset member is disposed between the upper die seat 201 and the lower die seat 301.

[0046] Four vertical guide pillars 104 are provided between the top seat 102 and the base 105. The lifting seat 103 has openings that match the guide pillars 104. The guide pillars 104 pass through the openings, allowing the lifting seat 103 to slide up and down along the guide pillars 104. The sliding of the lifting seat 103 is powered by the hydraulic cylinder 101. The upper mold base 201 and the lower mold base 301 are located between the lifting seat 103 and the base 105. The upper mold base 201 and the lower mold base 301 are pushed closer to each other by the lifting seat 103 and the base 105 to achieve mold closing. When the lifting seat 103 rises, the upper mold base 201 and the lower mold base 301 are moved away from each other by the action of the elastic reset member to achieve mold opening.

[0047] Further improvements include, for example Figure 4 and Figure 5 As shown, both the bottom surface of the lifting seat 103 and the top surface of the base 105 are provided with recesses 109. The upper mold seat 201 and the lower mold seat 301 are respectively disposed inside the two recesses 109. When the upper mold seat 201 and the lower mold seat 301 are closed, the two recesses 109 combine to form a cylindrical cavity with a horizontally extending axis and open ends. The upper mold seat 201 and the lower mold seat 301 are slidably connected to the inner wall of the cavity. The trimming lower mold 306 has a blanking channel 308 for the crankshaft forging to pass through. The lower mold seat 301 is provided with a second blanking port 303 communicating with the blanking channel 308. The base 105 is provided with a first blanking port 108 communicating with the second blanking port 303.

[0048] After the upper mold base 201 and the lower mold base 301 move closer together to close all the molds, the lifting seat 103 and the base 105 are also in contact with each other. The two recesses 109 combine to form a cylindrical cavity with a horizontally extending axis and open ends. The upper mold base 201 and the lower mold base 301 are located in the cylindrical cavity. When they rotate up and down, the cylindrical cavity can limit the upper mold base 201 and the lower mold base 301, improve the stability of the upper mold base 201 and the lower mold base 301 when rotating horizontally. The open ends of the cavity make it easier to observe the rotation state of the upper mold base 201 and the lower mold base 301, and facilitate the assembly and maintenance of the equipment. When the first discharge port 108 and the second discharge port 303 are connected to the discharge channel 308, the crankshaft forging after the flash is cut can fall from the channel to the bottom of the forging mold, thereby realizing the discharge of the finished crankshaft forging.

[0049] Further improvements include, for example Figures 6-10 As shown, the rotating component includes two arc-shaped racks 204 that are fixedly connected to the upper mold base 201 and the lower mold base 301 respectively, and a rotating power unit 107 that is fixedly connected to the lifting seat 103 or the base 105. When the upper mold base 201 and the lower mold base 301 are closed, the ends of the two racks 204 are joined together to form an annular structure coaxial with the cavity. The rotating power unit 107 is connected to the racks 204 in a transmission connection.

[0050] In the mold-closed state, the two racks 204 on the upper mold base 201 and the lower mold base 301 have their ends joined together to form a complete annular rack. The rotational power unit 107 is actually a motor and a gear mounted on the motor drive shaft. The annular rack meshes with the gear, and the motor provides power to drive the rack to rotate through the gear. This causes the upper mold base 201 and the lower mold base 301 to rotate in the cylindrical cavity formed by the recess 106, thus achieving the flipping of the upper mold base 201 and the lower mold base 301. Normally, the rotational power unit 107 is mounted on the base 105, which can reduce the weight of the lifting seat 103, thereby reducing the load on the hydraulic cylinder 101 and achieving an energy-saving effect.

[0051] Further improvements include, for example Figure 9 , Figure 10 and Figure 12 As shown, the top surface of the upper mold base 201 and the bottom surface of the lower mold base 301 are both arc surfaces that fit tightly against the inner side wall of the cavity. The elastic reset component includes a slide rod 206 fixedly connected to the upper mold base 201, a slide sleeve 302 fixedly connected to the lower mold base 301, and a spring 307 disposed inside the slide sleeve 302. The slide rod 206 slides in cooperation with the slide sleeve 302, and the two ends of the spring 307 are respectively connected to the slide rod 206 and the lower mold base 301.

[0052] The curved surface allows the upper mold base 201 and the lower mold base 301 to fit better with the recess 106, enabling the recess 106 to better position the upper mold base 201 and the lower mold base 301 and improve the stability of the upper mold base 201 and the lower mold base 301 in static conditions; after the mold is closed, the outer peripheral surface of the upper mold base 201 and the lower mold base 301 fits with the inner peripheral surface of the cylindrical cavity, which can improve the stability of the upper mold base 201 and the lower mold base 301 during dynamic rotation.

[0053] Further improvements include, for example Figure 4 As shown, the inner wall of the recess 109 is provided with a guide groove 111. When the upper mold base 201 and the lower mold base 301 are closed, the two guide grooves 111 combine to form an annular groove coaxial with the cavity. The rack 204 slides with the guide groove 111.

[0054] The guide groove 111 can cooperate with the rack 204, allowing the rack 204 to slide inside the guide groove 111, which plays a guiding and positioning role and improves the stability of the connection between the upper mold base 201 and the lower mold base 301 and the lifting base 103 and the base 105. In this technical solution, a groove 106 can be opened on the side of the base 105. The groove 106 communicates with the guide groove 111, so that the edge part of the rack 204 can extend into the groove 106. The rotation power unit 107 is set inside the groove 106. The rack 204 is driven to move by the rotation power unit 107. This can also protect the rotation power unit 107 and reduce the overall size of the equipment.

[0055] Further improvements include, for example Figures 7-11 As shown, a translation seat 203 is slidably disposed on the bottom surface of the upper die holder 201. The initial forging upper die 209, the final forging upper die 208 and the trimming upper die 207 are all fixedly connected to the translation seat 203. The upper die holder 201 is provided with a translation force part 202 for driving the translation seat 203 to slide along the first direction.

[0056] In use, a positioning groove 210 is formed on the upper mold base 201 along the first direction. The positioning groove 210 can be a T-groove or a dovetail groove. The translation base 203 is provided with a positioning strip 213 that slides with the positioning groove 210. The two work together to achieve a sliding connection between the translation base 203 and the upper mold base 201. At the same time, a sliding groove 211 is formed on the upper mold base 201 along the first direction, and the translation force part 202 is installed in the sliding groove 211 to protect the translation force part 211. A slider 212 is provided on the translation base 203 that slides with the sliding groove 211. The translation force part 211 can be a combination of a motor and a lead screw or a hydraulic cylinder. The slider 212 is controlled to slide inside the sliding groove 211 by the translation force part 211, thereby realizing the sliding of the translation base 203.

[0057] Further improvements include, for example Figure 1 , Figure 4 , Figure 7and Figure 9 As shown, both the lifting seat 103 and the base 105 are equipped with electromagnets 110, and the end of the upper mold seat 201 or the lower mold seat 301 is equipped with a magnetic block 205, which attracts one of the electromagnets 110.

[0058] One electromagnet 110 can be installed on the lifting seat 103 and the base 105 respectively. The magnetic block 205 is installed on the upper mold base 201 or the lower mold base 301. When the upper mold base 201 and the lower mold base 301 are flipped, the magnetic block 205 can be attracted to one of the two electromagnets 110, thereby realizing the positioning of the upper mold base 201 and the lower mold base 301 and preventing them from moving when the mold is closed and opened.

[0059] A crankshaft forging process, such as Figure 13 As shown, it includes the following steps:

[0060] Step 1: Mold closing. The upper forging die 209 and the lower forging die 304 close to perform initial forging on the first billet. The upper forging die 208 and the lower forging die 305 close to perform final forging on the second billet. The upper trimming die 207 and the lower trimming die 306 close to trim the edges on the third billet. The trimmed third billet is discharged from the blanking channel 308.

[0061] Step 2: Flip over. With the mold closed, flip over the upper mold base 201 and the lower mold base 301 to swap their positions.

[0062] Step 3: Open the mold. The initial forging upper mold 209 and the initial forging lower mold 304 open the mold, so that the first billet remains in the initial forging upper mold 209. The final forging upper mold 208 and the final forging lower mold 305 open the mold, so that the second billet remains in the final forging upper mold 208. The trimming upper mold 207 and the trimming lower mold 306 open the mold.

[0063] Step 4: Translation. The initial forging upper die 209, the final forging upper die 208, and the trimming upper die 207 are translated along the first direction so that the initial forging upper die 209 is aligned with the final forging lower die 305, and the final forging upper die 208 is aligned with the trimming lower die 306.

[0064] Step 5: Secondary mold closing, the initial forging upper mold 209 and the final forging lower mold 305 are closed, the final forging upper mold 208 and the trimming lower mold 306 are closed, and the initial forging lower mold 304 and the trimming upper mold 207 are in the open mold state.

[0065] Step 6: Reverse and reset. In the secondary mold closing state, reverse the upper mold base 201 and the lower mold base 301 to reset the upper mold base 201 and the lower mold base 301.

[0066] Step 7: Secondary mold opening. The initial forging upper mold 209 and the final forging lower mold 305 open, allowing the first billet to enter the final forging lower mold 305. The final forging upper mold 208 and the trimming lower mold 306 close, allowing the second billet to enter the trimming lower mold 306. A new billet is placed in the initial forging lower mold 304.

[0067] Step 8: Translation and reset. The initial forging upper die 209, the final forging upper die 208, and the trimming upper die 207 are translated along the first direction so that the initial forging upper die 209 is aligned with the initial forging lower die, the final forging upper die 208 is aligned with the final forging lower die 305, and the trimming upper die 207 is aligned with the trimming lower die 306.

[0068] Step 9: Repeat steps 1 through 8.

[0069] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A continuous forging die for crankshaft forgings, characterized in that, include: The upper die base (201) has a primary forging upper die (209), a final forging upper die (208) and a trimming upper die (207) arranged at equal intervals along the first direction on its bottom surface. The primary forging upper die (209), the final forging upper die (208) and the trimming upper die (207) are all slidably connected to the upper die base (201) along the first direction. The lower die holder (301) has a primary forging lower die (304), a final forging lower die (305) and a trimming lower die (306) arranged at equal intervals along the first direction on its top surface. The stamping part, wherein the upper die holder (201) and the lower die holder (301) are both disposed on the stamping part, and the upper die holder (201) and the lower die holder (301) are controlled to close and open the die through the stamping part; The upper die holder (201) and the lower die holder (301) are both connected to the stamping part through a horizontal rotating component. The horizontal rotating component controls the upper die holder (201) and the lower die holder (301) to rotate synchronously around the same horizontal axis. The stamping part includes a vertically arranged guide post (104), the top and bottom ends of the guide post (104) are respectively connected to a top seat (102) and a base (105), the guide post (104) is slidably connected to a lifting seat (103), the top seat (102) is fixedly connected to a hydraulic cylinder (101) that is throttle-connected to the lifting seat (103), the upper die seat (201) and the lower die seat (301) are both disposed between the lifting seat (103) and the base (105), and an elastic reset member is disposed between the upper die seat (201) and the lower die seat (301); The bottom surface of the lifting seat (103) and the top surface of the base (105) are both provided with recesses (109). The upper mold seat (201) and the lower mold seat (301) are respectively disposed inside the two recesses (109). When the upper mold seat (201) and the lower mold seat (301) are closed, the two recesses (109) combine to form a cylindrical cavity with a horizontally extending axis and open ends. The upper mold seat (201) and the lower mold seat (301) are slidably connected to the inner wall of the cavity. The trimming lower mold (306) has a blanking channel (308) for the crankshaft forging to pass through. The lower mold seat (301) is provided with a second blanking port (303) communicating with the blanking channel (308). The base (105) is provided with a first blanking port (108) communicating with the second blanking port (303).

2. The crankshaft forging continuous forging die according to claim 1, characterized in that, The rotating component includes two arc-shaped racks (204) fixedly connected to the upper mold base (201) and the lower mold base (301) respectively, and a rotating power unit (107) fixedly connected to the lifting seat (103) or the base (105). When the upper mold base (201) and the lower mold base (301) are closed, the ends of the two racks (204) are joined together to form an annular structure coaxial with the cavity. The rotating power unit (107) is connected to the racks (204) in a transmission connection.

3. The continuous forging die for crankshaft forgings according to claim 2, characterized in that, The top surface of the upper mold base (201) and the bottom surface of the lower mold base (301) are both arc surfaces that fit tightly against the inner side wall of the cavity. The elastic reset member includes a slide rod (206) fixedly connected to the upper mold base (201), a slide sleeve (302) fixedly connected to the lower mold base (301), and a spring (307) disposed inside the slide sleeve (302). The slide rod (206) slides in cooperation with the slide sleeve (302), and the two ends of the spring (307) are respectively connected to the slide rod (206) and the lower mold base (301).

4. The crankshaft forging continuous forging die according to claim 2, characterized in that, The inner wall of the recess (109) is provided with a guide groove (111). When the upper mold base (201) and the lower mold base (301) are closed, the two guide grooves (111) combine to form an annular groove coaxially arranged with the cavity. The rack (204) slides with the guide groove (111).

5. The continuous forging die for crankshaft forgings according to claim 1, characterized in that, The bottom surface of the upper die holder (201) is slidably provided with a translation seat (203). The initial forging upper die (209), the final forging upper die (208) and the trimming upper die (207) are all fixedly connected to the translation seat (203). The upper die holder (201) is provided with a translation force part (202) for driving the translation seat (203) to slide along the first direction.

6. The continuous forging die for crankshaft forgings according to claim 1, characterized in that, Both the lifting seat (103) and the base (105) are equipped with electromagnets (110), and the ends of the upper mold base (201) or the lower mold base (301) are equipped with magnetic blocks (205), which attract each other to one of the electromagnets (110).

7. A forging process for crankshaft forgings, applicable to the forging die described in any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Mold closing. The initial forging upper mold (209) and the initial forging lower mold (304) close to perform initial forging on the first billet. The final forging upper mold (208) and the final forging lower mold (305) close to perform final forging on the second billet. The trimming upper mold (207) and the trimming lower mold (306) close to trim the edge of the third billet. The trimmed third billet is discharged from the blanking channel (308). Step 2: Flip over. In the mold-closed state, flip over the upper mold base (201) and the lower mold base (301) to exchange their positions. Step 3: Mold opening. The initial forging upper mold (209) and the initial forging lower mold (304) open, so that the first billet remains in the initial forging upper mold (209). The final forging upper mold (208) and the final forging lower mold (305) open, so that the second billet remains in the final forging upper mold (208). The trimming upper mold (207) and the trimming lower mold (306) open. Step 4: Translation. The initial forging upper die (209), the final forging upper die (208), and the trimming upper die (207) are translated along the first direction, so that the initial forging upper die (209) is aligned with the final forging lower die (305), and the final forging upper die (208) is aligned with the trimming lower die (306). Step 5: Secondary mold closing, the initial forging upper mold (209) and the final forging lower mold (305) are closed, the final forging upper mold (208) and the trimming lower mold (306) are closed, and the initial forging lower mold (304) and the trimming upper mold (207) are in the open mold state; Step 6: Reverse and reset. In the secondary mold closing state, reverse the upper mold base (201) and the lower mold base (301) to reset the upper mold base (201) and the lower mold base (301); Step 7: Secondary mold opening, the initial forging upper mold (209) and the final forging lower mold (305) are opened, allowing the first billet to enter the final forging lower mold (305), the final forging upper mold (208) and the trimming lower mold (306) are closed, allowing the second billet to enter the trimming lower mold (306), and a new billet is placed in the initial forging lower mold (304); Step 8: Translation and reset. The initial forging upper die (209), the final forging upper die (208), and the trimming upper die (207) are translated along the first direction, so that the initial forging upper die (209) is aligned with the initial forging lower die, the final forging upper die (208) is aligned with the final forging lower die (305), and the trimming upper die (207) is aligned with the trimming lower die (306). Step 9: Repeat steps 1 through 8.

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