Composite forging device

Abstract

The utility model discloses a kind of composite forging device, which belongs to the technical field of forging equipment, and solves the problem of high labor intensity of manual demolding in the prior art, the device includes a material-punching red punch handle, an upper die, an outer die cylinder, a die cylinder push rod, a lower die sleeve, a lower die, a lower base plate, an elastic element, a lower die pressing plate and a lower ejector pin, wherein the outer die cylinder is a whole installation frame, the lower die sleeve is embedded in the outer die cylinder, the lower die is embedded in the lower die sleeve and forms a feed inlet with the lower die sleeve when in high position, the upper die is fixed on the slider bottom of forging press equipment and forms a forging cavity with the lower die, the lower base plate, the elastic element and the lower die pressing plate are sequentially arranged below the lower die sleeve and fixed with the outer die cylinder, the die cylinder push rod is connected with the lower ejector pin after being arranged through relevant components, and the material-punching red punch handle is arranged above the upper die and connected with the upper slider. The device can reduce die changing time, realize automatic demolding and efficient production of forging blanks.

Description

Technical Field

[0001] This utility model relates to the field of forging equipment technology. More specifically, this utility model relates to a composite forging apparatus. Background Technology

[0002] In the field of forging production technology, forging processing often faces the situation of having many different types of orders but small output of each type. In order to adapt to the forming requirements of different forgings, traditional forging equipment needs to frequently change the die cylinder to adjust the forming structure. Each die cylinder change requires stopping the machine to disassemble, reinstall and reposition, which not only consumes a lot of operating time, but also easily interrupts the production rhythm due to the die change process, resulting in a reduction in overall capacity.

[0003] Meanwhile, after the forging equipment completes the forging process, the forging billet often adheres to the mold surface and needs to be demolded manually. Manual demolding is not only labor-intensive, but may also cause deformation or surface damage to the forging billet due to uneven operating force, affecting the quality stability of the forging.

[0004] In addition, in order to balance the forming accuracy and demolding requirements of different forgings, traditional equipment has difficulty balancing the dual requirements of "rapid mold change" and "stable demolding" in the design of the mold cylinder structure. If the mold cylinder structure is simply optimized to reduce the number of mold changes, the demolding function will be weakened. If the demolding effect is strengthened, the complexity of the mold cylinder structure will be increased, further extending the mold change time. It is difficult to solve the problems of mold change efficiency and demolding labor intensity at the same time. Summary of the Invention

[0005] One object of this invention is to solve at least the aforementioned problems and / or defects, and to provide at least the advantages described below.

[0006] The purpose of this invention is to provide a composite forging device that solves the technical problems in existing technologies where frequent die cylinder changes waste time and affect production capacity due to a large variety of small-volume forging orders, and where manual demolding is labor-intensive. This device features automatic demolding, improving production efficiency and reducing worker labor intensity; a flat die cylinder with spring die function expands the functionality of the flat die; and the use of a feed inlet makes the forging process more stable and improves the quality of the forged billet. It is also more accommodating to different forging structures, saves die cylinder changing time, and increases the production efficiency of forged billets.

[0007] To achieve the purpose and other advantages of this utility model, a composite forging device is provided, which includes: a punching die shank, an upper die, an outer die cylinder, a die cylinder push rod, a lower die sleeve, a lower die, a lower pad, an elastic element, a lower die pressure plate, and a lower ejector pin. The outer mold cylinder is the overall installation frame of the device. The lower mold sleeve is embedded inside the outer mold cylinder. The lower mold is embedded inside the lower mold sleeve. When the lower mold is in a high position, it cooperates with the lower mold sleeve to form a feed port for feeding the forging billet raw material. The upper die is fixed to the bottom of the upper slide block of the forging equipment and located below the blanking die handle. The bottom of the upper die corresponds to and fits the top of the lower die, and can move down with the upper slide block to close with the lower die to form a forging cavity. The lower pad is fitted to the bottom of the lower mold sleeve, the elastic element is set below the lower pad, and the lower mold pressure plate covers the bottom of the elastic element and is fixedly connected to the outer mold cylinder. One end of the mold cylinder push rod passes through the lower mold pressure plate, the elastic element and the lower pad in sequence, and extends into the lower mold sleeve and is connected to the lower ejector pin. The other end is connected to the external drive mechanism. The lower ejector pin is located inside the lower mold sleeve and is set corresponding to the lower mold. The punching die handle is positioned above the upper die and connected to the upper slide of the forging equipment. It can move the upper die synchronously as the upper slide moves down, and can also demold the blank adhering to the side of the upper die when the upper slide moves up and the upper and lower dies separate.

[0008] Preferably, the composite forging device further includes an upper die core and an upper die pusher; the upper die core is embedded inside the upper die, and the bottom of the upper die core corresponds to and is adapted to the feed port of the lower die; the upper die pusher is sleeved on the outside of the upper die core and is slidably connected to the inner wall of the upper die, and the upper die pusher can move up and down along the inner wall of the upper die to push the billet adhering to the outside of the upper die core away from the upper die.

[0009] Preferably, the composite forging device further includes an upper backing plate; it is disposed between the upper slide block of the forging equipment and the blanking die handle, with the top of the upper backing plate fixedly connected to the upper slide block and the bottom of the upper backing plate fitting against the blanking die handle.

[0010] Preferably, the composite forging device further includes a lower punch; it is embedded inside the lower die, the top of the lower punch is connected to the feed port of the lower die, the bottom abuts against the top of the lower ejector pin, and the shape of the lower punch is adapted to the internal cavity of the lower die.

[0011] Preferably, the composite forging device further includes a rubber pad; it is disposed between the elastic element and the lower pad, with the top of the rubber pad fitting against the bottom of the lower pad and the bottom fitting against the top of the elastic element, and the thickness of the rubber pad is 5-10mm.

[0012] Preferably, the composite forging device further includes a self-locking nut; which is vertically inserted into the upper pad and the blanking die shank, and the self-locking nut is threadedly connected to the blanking die shank. There are two self-locking nuts, which are symmetrically distributed on both sides of the blanking die shank.

[0013] Preferably, the composite forging device further includes a screw; which passes vertically through the lower die plate, the elastic element, the lower pad plate and the side wall of the outer die cylinder, the screw is threadedly connected to the side wall of the outer die cylinder, and there are four screws evenly distributed around the circumference of the outer die cylinder.

[0014] Preferably, the elastic element is made of rubber.

[0015] This utility model has at least the following beneficial effects: First, the composite forging device of this utility model contains a hot stamping die handle with a feeding type, which has an automatic demolding function, improves production efficiency, and reduces the labor intensity of workers.

[0016] Secondly, the composite forging device of this utility model has a flat die cylinder with spring die function, which expands the function of the flat die. The use of the feed port makes the forging process more stable and improves the quality of the forged billet. It is more accommodating to the structure of forgings, saves die cylinder changing time, and improves the production efficiency of forged billets.

[0017] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the initial state of the composite forging device before feeding according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the forged billet forming state of the composite forging device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the billet in the demolding process of a composite forging device according to an embodiment of the present invention, showing the billet in the state to be removed. Reference numerals in the attached diagram: 1: punching die handle, 2: upper die, 3: outer die cylinder, 4: die cylinder push rod, 5: lower die sleeve, 6: lower die, 7: lower pad, 8: elastic element, 9: lower die pressure plate, 10: lower ejector pin, 11: upper die inner core, 12: upper die push cylinder, 13: upper pad, 14: lower punch, 15: rubber pad, 16: self-locking nut, 17: screw, 18: punch handle push rod, 19: nut, 20: copper rod, 21: lower die long push rod, 22: upper die pressure plate, 23: upper ejector pin, 24: lower die push cylinder, 25: forging billet. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0020] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0021] It should be noted that in the description of this utility model, the terms "horizontal", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] It should be noted that, unless otherwise specified, the control methods in the following technical solutions are conventional methods, and the equipment structures, unless otherwise specified, can be obtained commercially.

[0023] like Figures 1-3 This utility model provides a composite forging device, comprising: a punching die shank 1, an upper die 2, an outer die cylinder 3, a die cylinder push rod 4, a lower die sleeve 5, a lower die 6, a lower pad 7, an elastic element 8, a lower die pressure plate 9, and a lower ejector pin 10; wherein, the outer die cylinder 3 is the overall mounting frame of the device, the lower die sleeve 5 is embedded inside the outer die cylinder 3, the lower die 6 is embedded inside the lower die sleeve 5, and when the lower die 6 is in a high position, it cooperates with the lower die sleeve 5 to form a feed port for feeding the forging billet raw material; the upper die 2 is fixed to the bottom of the upper slide block of the forging equipment and is located below the punching die shank 1, the bottom of the upper die 2 corresponds to and is adapted to the top of the lower die 6, and can move down with the upper slide block to close with the lower die 6 to form a forging cavity; the lower die 2 is fixed to the bottom of the upper slide block of the forging equipment and is located below the punching die shank 1, the bottom of the upper die 2 corresponds to and is adapted to the top of the lower die 6, and can move down with the upper slide block to close with the lower die 6 to form a forging cavity; the lower die 6 is fixed to the lower slide block. The pad 7 is fitted to the bottom of the lower die sleeve 5, the elastic element 8 is located below the lower pad 7, and the lower die pressure plate 9 covers the bottom of the elastic element 8 and is fixedly connected to the outer die cylinder 3. One end of the die cylinder push rod 4 passes through the lower die pressure plate 9, the elastic element 8 and the lower pad 7 in sequence, and extends into the lower die sleeve 5 and is connected to the lower ejector pin 10. The other end is connected to the external drive mechanism. The lower ejector pin 10 is located inside the lower die sleeve 5 and is set corresponding to the lower die 6. The ejector-type hot stamping die handle 1 is set above the upper die 2 and is connected to the upper slide of the forging equipment. It can move the upper die 2 synchronously as the upper slide moves down, and can also demold the blanks adhering to the side of the upper die 2 when the upper slide moves up and the upper and lower dies separate.

[0024] In the above technical solution, the core components of the device include a hot-work die handle 1, an upper die 2, an outer die cylinder 3, a die cylinder push rod 4, a lower die sleeve 5, a lower die 6, a lower pad 7, an elastic element 8, a lower die pressure plate 9, and a lower ejector pin 10. The outer die cylinder 3, serving as the overall mounting frame, is made of 45 steel (tensile strength ≥600 MPa, wall thickness 15-25 mm), providing structural support and stability. The lower die sleeve 5, embedded inside the outer die cylinder 3, is made of H13 hot-work die steel (hardness 50-55HRC, impact toughness ≥15 J / cm). 2The lower die 6 is made of H13 hot work die steel and is fitted inside the lower die sleeve 5 (the fit clearance between the outer wall of the lower die 6 and the inner wall of the lower die sleeve 5 is 0.03-0.05mm). When in the high position, it forms a feed port with the lower die sleeve 5 (feed port diameter 20-50mm, suitable for copper rod raw materials with diameter 18-48mm), facilitating the insertion of forging blank raw materials. The bottom of the lower die 6 is connected to the auxiliary cylinder drive mechanism in the outer die cylinder 3 (cylinder model SC63×50, working pressure 0.4-0.6 MPa). The auxiliary cylinder can drive the lower die 6 to move up and down 20-40 mm, so that when the lower die 6 is in the high position, it fits with the lower die sleeve 5 to form a feed port for inserting forging blank raw materials. The upper die 2 is fixed to the bottom of the upper slide of the forging equipment, is made of H13 hot work die steel, and fits with the lower die 6 to form a forging cavity. The lower backing plate 7, made of 40Cr steel, is fitted snugly to the bottom of the lower die sleeve 5, serving as support and force transmission. The elastic element 8, made of rubber (Shore hardness 60-80D, temperature-resistant rubber, temperature range -20℃ to 300℃), is located below the lower backing plate 7. The compression of the elastic element is 5-15 mm, providing elastic cushioning against forging impact and assisting the lower die 6 in resetting. The lower die pressure plate 9, made of 45 steel, covers the bottom of the elastic element 8 and is fixedly connected to the outer die cylinder 3, ensuring the assembly is secure. The die cylinder push rod 4, made of 40Cr steel, passes through the lower die pressure plate 9, the elastic element 8, and the lower backing plate 7 at one end, extending into the lower die sleeve 5 and connecting to the lower ejector pin 10. The other end connects to an external drive mechanism, such as a hydraulic or pneumatic device. The lower ejector pin 10, made of H13 hot work die steel, is located inside the lower die sleeve 5, corresponding to the lower die 6, and is used to eject the forging billet. The punching die shank 1 is made of 40Cr steel, located above the upper die 2 and connected to the upper slide block, realizing the movement of the upper die 2 and automatic demolding function.

[0025] Working principle: When the lower die 6 is in the high position, it forms a feed port into which the copper rod 20 is placed. The punching die shank 1 moves down with the slide block on the forging equipment, contacting the lower die 6 during the process, and then moving down together until the lower die 6 reaches the low position, completing the forging process and forming the forging blank 25. The upper slide block moves up, and the upper and lower dies separate. If the forging blank 25 sticks to the upper die 2, the punching die shank 1 automatically moves to push the blank adhering to the side of the upper die 2, achieving automatic demolding. If the forging blank 25 sticks to the lower die 6, after the upper and lower dies separate, under the action of the elastic element 8 (rubber), the forging blank 25 is demolded from the lower punch 14, but will continue to stick to the lower die 6 until the lower die 6 reaches the high position. Under the action of the drive mechanism (such as a hydraulic cylinder), the die cylinder push rod 4 drives the lower ejector pin 10 and the lower die push cylinder 24 to push out the forging blank 25, completing the demolding of the forging blank 25 from the lower die 6, thereby removing the forging blank 25 and further ensuring smooth demolding. The elastic element 8 provides cushioning during the forging process, reduces impact, and improves the quality of the forged billet.

[0026] In existing forging equipment, frequent die cylinder changes are required to accommodate different forging orders. Die changes involve downtime and disassembly, wasting time and impacting production capacity. Furthermore, demolding relies on manual operation, which is labor-intensive and prone to causing forging deformation. This invention uses an outer die cylinder 3 as the overall frame, allowing for quick adjustment or replacement of the lower die sleeve 5 and lower die 6, reducing die change time. Simultaneously, the ejector-type hot-pressing die handle 1 and the die cylinder push rod 4 work together to achieve automatic demolding, reducing manual intervention and improving production efficiency and quality stability. In addition, the feed port design and the application of the elastic element 8 make the forging process more stable and enhance its adaptability to different forging structures.

[0027] In another technical solution, the composite forging device further includes: an upper die inner core 11 and an upper die pusher 12; the upper die inner core 11 is embedded inside the upper die 2, and the bottom of the upper die inner core 11 corresponds to and is adapted to the feed port of the lower die 6; the upper die pusher 12 is sleeved on the outside of the upper die inner core 11 and is slidably connected to the inner wall of the upper die 2, and the upper die pusher 12 can move up and down along the inner wall of the upper die 2 to push the billet adhering to the outside of the upper die inner core 11 away from the upper die 2.

[0028] In the above technical solution, the upper die core 11 is made of H13 hot work die steel and is embedded in the center of the upper die 2. Its bottom shape precisely corresponds to and matches the feed port of the lower die 6, forming a specific top contour of the forging cavity. The upper die pusher 12 is made of 40Cr steel and is sleeved on the outside of the upper die core 11, maintaining a sliding connection with the inner wall of the upper die 2, allowing it to move smoothly up and down along the inner wall of the upper die 2. The fit clearance between the inner wall of the upper die pusher 12 and the outer wall of the upper die core 11 is 0.02-0.04 mm, and the sliding connection between the outer wall of the upper die pusher 12 and the inner wall of the upper die 2 is 0.02-0.05 mm. The top of the upper die pusher 12 is connected to the ejector die handle 1 via a linkage rod. When the ejector die handle 1 moves down, it can simultaneously drive the upper die pusher 12 down by 5-15 mm, pushing the blank adhering to the outside of the upper die core 2 away from the upper die 2.

[0029] During operation, when forging is complete and the upper die 2 moves upward with the upper slide block, the forged billet may sometimes adhere to the outer side of the complex-shaped inner core 11 of the upper die. At this time, the upper die pusher 12 is pushed downward by the linkage of the ejector die shank 1 or by other driving mechanisms. Its bottom end face acts on the adhered billet, reliably pushing it away from the outer surface of the inner core 11 of the upper die, thereby achieving automatic demolding for upper dies with complex shapes. This process requires no manual intervention, ensuring the stability and consistency of demolding.

[0030] Existing forging equipment faces extreme difficulty in demolding the upper die when dealing with forgings with complex concave or deep cavity structures. This typically relies heavily on manual hammering and prying by the operator, which is not only labor-intensive and inefficient but also prone to causing scratches, deformation, or even die damage to the forging surface due to uneven force or inaccurate positioning. This invention creatively solves the problem of automatic demolding of complex upper dies by adding a combined structure of an upper die inner core 11 and an upper die pusher 12. The upper die inner core 11 is responsible for precise forming, while the upper die pusher 12 is dedicated to demolding. Working together, they ensure the quality of the forging while achieving complete automation of the demolding process. This significantly reduces the labor intensity of workers, eliminates product quality problems caused by improper manual demolding operations, and further improves the overall forging production cycle and efficiency.

[0031] In another technical solution, the composite forging device further includes an upper pad 13; it is disposed between the upper slide block of the forging equipment and the blanking die handle 1, the top of the upper pad 13 is fixedly connected to the upper slide block, and the bottom is in contact with the blanking die handle 1.

[0032] In the above technical solution, the upper backing plate 13 is made of 40Cr steel and is set between the upper slide block of the forging equipment and the blanking die shank 1. The top of the upper backing plate 13 is fixedly connected to the bottom surface of the upper slide block by bolts, while its bottom is tightly fitted to the upper surface of the blanking die shank 1.

[0033] During operation, the upper backing plate 13 acts as a rigid force transmission and distribution component, evenly transmitting the enormous forging pressure applied by the upper slide block to the blanking die shank 1, and then to the entire upper die 2. This structure effectively avoids the forging pressure concentrating on a localized area of ​​the blanking die shank 1, preventing deformation or premature fatigue damage at the connection points due to stress concentration. Simultaneously, the presence of the upper backing plate 13 provides a stable mounting reference surface, ensuring the perpendicularity and coaxiality of the blanking die shank 1 and the upper die 2, making the forging process smoother.

[0034] Existing forging equipment typically mounts the blanking die shank directly onto the upper slide block, lacking effective force distribution and structural reinforcement. Under long-term, high-frequency impact loads, the connection interface between the blanking die shank and the upper slide block is prone to plastic deformation or fretting wear, leading to loosening of the connection. This not only causes a decrease in forging accuracy and produces defective products but also increases maintenance time for equipment downtime for tightening or replacing parts, impacting production efficiency. This invention, by adding an upper backing plate 13, significantly enhances the rigidity and stability of the upper die system connection, effectively distributing the working load and greatly reducing deformation and wear at the connection points. This ensures forging accuracy and equipment reliability during long-term operation, reduces maintenance needs, and improves the overall utilization rate of the equipment.

[0035] In another technical solution, the composite forging device further includes a lower punch 14; it is embedded inside the lower die 6, the top of the lower punch 14 is connected to the feed port of the lower die 6, the bottom abuts against the top of the lower ejector pin 10, and the shape of the lower punch 14 is adapted to the internal cavity of the lower die 6.

[0036] In the above technical solution, the lower punch is made of H13 hot work die steel (quenched at 1020-1050℃ and tempered at 580-620℃, with a hardness of 50-55HRC and a draft angle of 15°-30°), and is precisely embedded in the center of the lower die 6. The top of the lower punch 14 is directly connected to the feed port of the lower die 6, forming the bottom forming part of the cavity; the top of the lower punch 14 is connected to the feed port of the lower die, and the top of the lower punch has a draft angle of 15°-30°; the bottom of the lower punch 14 abuts against the top of the lower ejector pin 10, and the shape of the lower punch 14 is adapted to the internal cavity of the lower die 6 (fitting clearance 0.03-0.05 mm). The outer contour shape of the lower punch 14 is precisely adapted to the internal cavity of the lower die 6, together forming a complete forging space.

[0037] During operation, when the forging billet is fed into the feed port, it is positioned at the top of the lower punch 14. When the upper die 2 presses down for forging, the billet undergoes plastic deformation within the cavity formed by the lower die 6 and the lower punch 14, completing the forming process. After forging is completed, during the demolding stage, the external drive mechanism pushes the lower ejector pin 10 upward through the die cylinder push rod 4. The lower ejector pin 10 transmits force to the lower punch 14, causing the lower punch 14 to move upward relative to the lower die 6, thereby stably and smoothly ejecting the formed forging billet from the lower die cavity, achieving automatic demolding on the lower die side.

[0038] Existing forging equipment typically uses a single, integral lower die. When producing forgings with lower bosses, blind holes, or complex bottom shapes, either machining the integral lower die is extremely difficult and costly, or demolding is exceptionally difficult due to the large clamping force of the forging, often requiring manual assistance, resulting in low efficiency and easy damage to the forging surface. This invention separates the forming function of the lower die cavity from the ejection and demolding function by adding an independent lower punch 14. This design significantly reduces the machining complexity and cost of the lower die 6 itself. More importantly, it provides an efficient and reliable mechanical ejection mechanism that can automatically demold complex-shaped forgings from the lower die, completely avoiding manual intervention, significantly improving demolding efficiency and the stability of forging surface quality, while reducing reliance on operator skills.

[0039] In another technical solution, the composite forging device further includes a rubber pad 15; it is disposed between the elastic element 8 and the lower pad 7, the top of the rubber pad 15 is in contact with the bottom of the lower pad 7, the bottom is in contact with the top of the elastic element 8, and the thickness of the rubber pad 15 is 5-10 mm.

[0040] In the above technical solution, the rubber pad 15 is made of polyurethane rubber and is disposed at the interface between the elastic element 8 and the lower pad 7. The top of the rubber pad 15 is fully in contact with the bottom of the lower pad 7, and its bottom is fully in contact with the top of the elastic element 8. The thickness of the rubber pad 15 is controlled within the range of 5 mm to 10 mm, for example, it can be specifically implemented as 8 mm.

[0041] During operation, when the forging load is transmitted to the lower pad 7 through the lower die 6 and lower die sleeve 5, the rubber pad 15, acting as a flexible intermediate medium, effectively absorbs and disperses local stress. It fills the microscopic unevenness between the rigid lower pad 7 and the elastic element 8, ensuring a uniform distribution of contact pressure. When the die cylinder push rod 4 moves, the rubber pad 15 also compensates for minor displacements and deformation deviations between components, making the force on the elastic element 8 more uniform and its movement smoother.

[0042] Existing forging equipment typically places the lower pad directly onto the elastic element, resulting in rigid or semi-rigid contact. Under prolonged and intense impact loads and cyclic stress, the top edge of the elastic element is prone to shear failure or premature fatigue cracking due to stress concentration, leading to elastic failure and requiring frequent downtime for replacement. This not only increases maintenance costs but also affects production continuity. This invention cleverly eliminates the stress concentration problem at the contact interface between the rigid component and the elastic element by adding a rubber pad 15 of a specific thickness. Utilizing its excellent elasticity and cushioning properties, this significantly reduces the wear and damage rate of the elastic element 8, greatly extending its service life. This, in turn, improves the overall reliability and durability of the equipment and reduces maintenance frequency.

[0043] In another technical solution, the composite forging device further includes a self-locking nut 16; it is vertically inserted into the upper pad 13 and the blanking die shank 1, and the self-locking nut 16 is threadedly connected to the blanking die shank 1. There are two self-locking nuts 16, which are symmetrically distributed on both sides of the blanking die shank 1.

[0044] In the above technical solution, the self-locking nut 16 is made of 40Cr steel and is vertically inserted into a pre-set through hole on the upper pad 13 and a corresponding threaded hole on the blanking die shank 1. The self-locking nut 16 and the blanking die shank 1 are fastened together by threads. There are two self-locking nuts 16, which are symmetrically distributed on the left and right sides of the center line of the blanking die shank 1.

[0045] During operation, the two self-locking nuts 16 work together to firmly lock the upper pad 13 to the blanking die shank 1. The unique anti-loosening structure inside the self-locking nuts 16 effectively resists the loosening tendency of the threaded pair under the continuous high-frequency, high-impact vibration conditions of the forging equipment, maintaining the preload force at all times. This symmetrically distributed design ensures a balanced locking force, preventing the blanking die shank 1 from tilting due to loosening on one side.

[0046] In existing forging equipment, the upper backing plate and the blanking die shank are typically connected using ordinary nuts or bolts. Under the intense impact and vibration of the forging process, this ordinary threaded connection is prone to loosening, leading to gaps and relative displacement between the components of the upper die system. This not only causes a decrease in forging accuracy and unstable product dimensions, but in severe cases, it can even lead to connection failure, causing safety accidents such as the blanking die shank or upper die becoming detached. Frequent shutdowns for inspection and tightening are required, seriously affecting production efficiency and operational safety. This invention creatively solves the problem of preventing loosening of the core connecting components of the upper die system under severe vibration by using symmetrically arranged self-locking nuts 16. This greatly improves the reliability and stability of the connection, ensures consistent accuracy during long-term continuous production, and eliminates safety hazards and maintenance downtime caused by loose connections.

[0047] In another technical solution, the composite forging device further includes a screw 17; it passes vertically through the side wall of the lower die plate 9, the elastic element 8, the lower pad 7 and the outer die cylinder 3, the screw 17 is threadedly connected to the side wall of the outer die cylinder 3, and there are four screws 17, which are evenly distributed around the circumference of the outer die cylinder 3.

[0048] In the above technical solution, the screw 17 is made of 45 steel and passes through the corresponding through holes on the lower mold plate 9, the elastic element 8, and the lower pad 7 in a vertical direction, and finally screws into and passes through the threaded hole on the side wall of the outer mold cylinder 3. There are four screws 17, and these four screws 17 are evenly distributed along the circumference of the outer mold cylinder 3.

[0049] During operation, the four screws 17 together form a reliable preload application and retention system. By tightening these screws 17, a uniform preload can be applied to the entire lower assembly, including the lower die plate 9, the elastic element 8, and the lower pad 7, firmly pressing them into the frame of the outer die cylinder 3. This uniformly distributed circumferential preload ensures that the elastic element 8 is uniformly compressed during operation, providing consistent cushioning performance, while preventing the lower die sleeve 5 and its internal components from loosening or shifting under forging impact, thus guaranteeing the accuracy and stability of the forming cavity.

[0050] In existing forging equipment, the pressure plate of the lower die and the die cylinder frame are typically connected by simple snap-fits or a few unevenly distributed bolts. Under the influence of large, directional, and variable forging impact loads, this connection method easily leads to uneven preload, causing some connection points to loosen first, resulting in fretting, vibration, and even misalignment of the entire lower die assembly within the frame. This not only accelerates localized wear of the elastic elements and the die but also reduces the closing accuracy of the forging cavity, directly affecting the dimensional consistency and quality stability of the forgings, and causing significant noise and vibration during equipment operation. This invention establishes a high-rigidity modular locking structure by employing four circumferentially evenly distributed screws 17, greatly enhancing the overall connection rigidity and stability of the lower assembly, effectively suppressing fretting and deformation of the assembly under impact loads, ensuring cavity accuracy, extending the service life of the die and elastic elements, and reducing equipment operating noise.

[0051] In another technical solution, the composite forging device further includes a punch shank ejector rod 18, a nut 19, a copper rod 20, a lower die long ejector rod 21, an upper die pressure plate 22, an upper ejector pin 23, and a lower die push cylinder 24.

[0052] In the above technical solution, the punch shank ejector rod 18 is made of 40Cr steel and is vertically installed inside or above the punching die shank 1. When the upper slide returns to a specific position, the punch shank ejector rod 18 will contact and be triggered by the fixed stop on the forging equipment, thereby pushing the demolding mechanism inside the punching die shank 1 downward. It is a key transmission component for starting the automatic demolding action of the upper die.

[0053] The nut 19 is made of 45 steel and is screwed into the end of the screw 17. By tightening the nut 19, the required preload can be applied to and maintained on the screw 17, thereby ensuring that the lower assembly, consisting of the lower mold plate 9, the elastic element 8, the lower pad 7, etc., is stably pressed into the outer mold cylinder 3, preventing the assembly from loosening.

[0054] The lower die long ejector rod 21 is made of H13 hot work die steel and passes through the bottom of the lower die 6 and the lower die sleeve 5. During the demolding process, the lower die long ejector rod 21 moves upward under the drive of the die cylinder push rod 4. Its top end directly acts on the forging blank or pushes the forging blank out of the cavity of the lower die 6 through the lower punch 14. It is the actuator that realizes the long stroke ejection of the lower die side.

[0055] The upper die plate 22 is made of 40Cr steel and is fixed to the top or side of the upper die 2 by bolts. The main function of the upper die plate 22 is to reliably clamp and fix the upper die 2 to the bottom of the upper slide block of the forging equipment, prevent the upper die 2 from shifting or falling off under impact load, and ensure the safety of the connection.

[0056] The upper ejector pin 23 is made of H13 hot work die steel and is located inside the upper die 2. When the upper die 2 completes the forging and returns, driven by the upper die demolding mechanism (such as the ejector-type hot stamping die shank 1), the upper ejector pin 23 moves downward and acts on the forging blank that may adhere to the inner core 11 of the upper die or the upper die cavity, assisting it to detach from the upper die 2. It is an auxiliary demolding element on the upper die side.

[0057] The lower die pusher 24 is made of 40Cr steel and is sleeved around the lower die 6 or the lower punch 14, located inside the lower die sleeve 5. During the demolding process, the lower die pusher 24 can move upward in conjunction with the lower ejector pin 10 or the lower die long ejector rod 21. Its working surface is used to push the flash or specific shaped parts of the forging billet, helping complex forgings to be smoothly removed from the lower die 6.

[0058] Although the technical solution of this utility model has been disclosed above, it is not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A composite forging apparatus, characterized in that, include: The components of the punching die include: upper die, outer die cylinder, die cylinder push rod, lower die sleeve, lower die, lower pad, elastic element, lower die pressure plate and lower ejector pin. The outer mold cylinder is the overall installation frame of the device. The lower mold sleeve is embedded inside the outer mold cylinder. The lower mold is embedded inside the lower mold sleeve. When the lower mold is in a high position, it cooperates with the lower mold sleeve to form a feed port for feeding the forging billet raw material. The upper die is fixed to the bottom of the upper slide block of the forging equipment and located below the punching die handle. The bottom of the upper die and the top of the lower die are correspondingly matched and can move down with the upper slide block to close with the lower die to form a forging cavity. The lower pad is fitted to the bottom of the lower mold sleeve, the elastic element is set below the lower pad, and the lower mold pressure plate covers the bottom of the elastic element and is fixedly connected to the outer mold cylinder. One end of the mold cylinder push rod passes through the lower mold pressure plate, the elastic element and the lower pad in sequence, and extends into the lower mold sleeve and is connected to the lower ejector pin. The other end is connected to the external drive mechanism. The lower ejector pin is located inside the lower mold sleeve and is set corresponding to the lower mold. The punching die handle is positioned above the upper die and connected to the upper slide of the forging equipment. It can move the upper die synchronously as the upper slide moves down, and can also demold the blank adhering to the side of the upper die when the upper slide moves up and the upper and lower dies separate.

2. The composite forging apparatus as described in claim 1, characterized in that, It also includes an upper mold core and an upper mold pusher; the upper mold core is embedded inside the upper mold, and the bottom of the upper mold core is matched with the feed port of the lower mold; the upper mold pusher is sleeved on the outside of the upper mold core and is slidably connected to the inner wall of the upper mold, and the upper mold pusher can move up and down along the inner wall of the upper mold to push the blank adhering to the outside of the upper mold core away from the upper mold.

3. The composite forging apparatus as described in claim 1, characterized in that, It also includes an upper backing plate; it is set between the upper slide block of the forging equipment and the blanking die handle, with the top of the upper backing plate fixedly connected to the upper slide block and the bottom of the upper backing plate fitting against the blanking die handle.

4. The composite forging apparatus as described in claim 1, characterized in that, It also includes a lower punch; it is embedded inside the lower die, with the top of the lower punch connected to the feed port of the lower die, the bottom abutting against the top of the lower ejector pin, and the shape of the lower punch matching the internal cavity of the lower die.

5. The composite forging apparatus as described in claim 1, characterized in that, It also includes a rubber pad; which is disposed between the elastic element and the lower pad, with the top of the rubber pad fitting against the bottom of the lower pad and the bottom fitting against the top of the elastic element, and the thickness of the rubber pad is 5-10 mm.

6. The composite forging apparatus as described in claim 5, characterized in that, It also includes self-locking nuts; which are vertically inserted into the upper pad and the blanking die handle, and the self-locking nuts are threadedly connected to the blanking die handle. There are two self-locking nuts, which are symmetrically distributed on both sides of the blanking die handle.

7. The composite forging apparatus as described in claim 1, characterized in that, It also includes screws; which are vertically inserted into the lower mold plate, elastic element, lower pad and side wall of the outer mold cylinder. The screws are threaded to the side wall of the outer mold cylinder, and there are four screws, which are evenly distributed around the circumference of the outer mold cylinder.

8. The composite forging apparatus as described in claim 1, characterized in that, The elastic element is made of rubber.

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