Splitting demolding device for forging

Abstract

The utility model discloses a kind of forging and pressing piece split demolding devices, belong to forging and pressing die technical field.The device aims to solve the problem that forging and pressing piece with outer peripheral convex ring and other reverse buckle structure is difficult to demould, and the defects that existing lateral demolding mechanism is complex, cost is high, reliability is poor.The device includes lower die assembly and upper die assembly, and upper die assembly is equipped with upper die plate, side extrusion wedge, split mould core and pulling mechanism.Pulling mechanism is made of first branch arm, conversion cross bar and second branch arm.In the opening process, pulling mechanism converts the vertical upward movement of upper die plate into lateral tension to the bottom of split mould core, drives split mould core to tilt and rotate outward, realizes reliable separation with forging convex ring.The utility model is through pure mechanical connecting rod structure, effectively utilizes opening kinetic energy to realize lateral demolding, without additional lateral execution piece, with the advantages of simple structure, low manufacturing cost, demolding reliability is high and efficiency is high.

Description

Technical Field

[0001] This utility model belongs to the field of forging die technology, specifically relating to a split demolding device for forging parts with an undercut structure (such as an outer peripheral protruding ring). Background Technology

[0002] In existing technologies, for cylindrical or similar forgings, when a convex ring structure needs to be formed on the outer periphery, multi-component separate die cores are typically used for extrusion molding. However, due to the interlocking of the convex ring with the inner groove of the die core, it is difficult to directly demold the forging in the vertical direction after molding. Existing demolding solutions often involve adding hydraulic actuators, T-slot slider structures, or inclined guide pillars to the side of the die, using external driving force to achieve lateral movement of the die core. Such structures are complex, increasing the manufacturing cost and maintenance difficulty of the die, and because components such as the lateral sliders need to withstand huge forging and locking forces, they are prone to wear and failure.

[0003] The purpose of this invention is to provide a forging part split demolding device that is simple in structure, reliable in operation, has high demolding efficiency and does not require additional lateral drive, so as to solve the complex and costly lateral demolding problem in the prior art. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model aims to provide a technical solution that can solve the above problems.

[0005] To achieve the above objectives, this utility model provides a forging part split demolding device, which includes a lower die assembly and an upper die assembly that can move up and down relative to the lower die assembly. The lower die assembly 20 is provided with a lower template 21 and a lower die punch 23 for supporting the bottom of the forging part; the upper die assembly 10 is provided with an upper template 12, a side extrusion wedge 14, and at least two sets of split die cores 15; the side extrusion wedge 14 is connected to the upper template 12 and is used to drive the split die cores to close towards the center through inclined surface cooperation during the die closing process to form a forging cavity; the upper die assembly 10 is also provided with a pulling mechanism, which is connected between the upper template 12 and the split die cores; during the die opening stroke when the upper template 12 moves upward, the pulling mechanism converts the longitudinal displacement of the upper template into a lateral pulling force that pulls the split die cores away from the forging part, thereby separating the split die cores from the forging part.

[0006] Structural composition: Lower die assembly: A lower die plate 21 is provided, and a lower die punch 23 is fixedly connected above it to provide bottom support for the forging.

[0007] Upper mold assembly: includes an upper template 12, side extrusion wedges 14, at least two sets of separate mold cores 15 / 16 / 17, and a tensioning mechanism.

[0008] Mold closing and locking: The side extrusion wedge 14 is connected to the upper template 12. The inner wall of the side extrusion wedge 14 has an inner conical surface, and the outer wall of the split mold core has an outer conical surface that mates with the inner conical surface. During the mold closing process, the upper template 12 drives the side extrusion wedge 14 downward, and drives the split mold core to close towards the center through the inclined surface engagement. The huge extrusion force provided by the side extrusion wedge 14 locks the split mold core, so that the forming grooves inside it together form a forging cavity, completing the forming of the outer peripheral convex ring of the forged part.

[0009] Demolding mechanism (pull mechanism): The upper mold assembly is equipped with a tensioning mechanism, one end of which is connected to the upper template 12, and the other end is connected to the bottom or lower side of the split mold core 15 / 16 / 17.

[0010] The traction mechanism is specifically a linkage structure, including a first arm 31, a transition crossbar 32, and a second arm 33. The upper end of the first arm 31 is fixed to the bottom of the upper template 12; The upper end of the second arm 33 is fixed to the bottom or lower side of the split mold core 15. The two ends of the conversion crossbar 32 are rotatably connected to the first arm 31 and the second arm 33 via rotating shafts, respectively.

[0011] Demolding principle: After forging, the upper mold plate 12 moves upward to begin demolding. The first arm 31 moves upward synchronously with the upper mold plate 12. Through the rotation of the conversion crossbar 32, the vertical displacement of the upper mold plate is converted into a lateral pulling force on the second arm 33, thereby driving the second arm 33 to swing outward. The second arm 33 causes the bottom of the split mold core 15 to tilt and rotate outward, so that the groove on the inner side of the split mold core avoids the convex ring on the outer periphery of the forged part, realizing the split demolding.

[0012] Preferred limiting mechanism (composite top block): To ensure that the split mold core can reliably rotate and separate around a certain fulcrum when it is pulled laterally, the upper mold assembly is preferably provided with a composite top block 11.

[0013] The composite top block 11 is located on the inner top of the side extrusion wedge block 14 and presses against the top surface of the split mold core.

[0014] The composite ejector block 11 is mounted on the upper mold plate 12 via an independent stroke drive mechanism (such as a hydraulic cylinder or preload spring). This ensures that during the initial stage of the mold opening stroke, the composite ejector block 11 can extend downwards relative to the upper mold plate 12 or remain stationary, providing sufficient pressure or limiting effect on the split mold core. This prevents the mold core from directly adhering to the side extrusion wedges and moving upwards, thus ensuring that the bottom of the mold core can be smoothly pulled outwards by the pulling mechanism. After the mold core separates, the composite ejector block 11 moves upwards synchronously with the upper mold plate 12, completing the overall demolding.

[0015] Compared with the prior art, the beneficial effects of this utility model are: ①Simplified structure and reduced cost: This device adopts a linkage pulling mechanism, which uses the vertical movement of the upper template itself to achieve lateral demolding. It eliminates the need for additional lateral hydraulic cylinders, air cylinders or complex T-shaped slider structures, greatly simplifying the overall structure of the mold and reducing manufacturing costs.

[0016] ② High reliability: The linkage mechanism is a purely mechanical structure. Compared with hydraulic or pneumatic actuators, it has stronger impact resistance, more stable operation, and a lower failure rate, making it particularly suitable for heavy-load and high-impact forging conditions.

[0017] ③ High demolding efficiency: The demolding action is completed synchronously with the mold opening stroke, without the need for additional delay or driving steps, which improves the overall production efficiency.

[0018] ④ Controllable demolding force: Through the geometric design of the connecting rod, the magnitude and stroke of the lateral tension can be precisely controlled, ensuring that the split mold core can reliably and smoothly detach from the convex ring structure of the forging.

[0019] ⑤ Ensure demolding integrity: The composite ejector block limits the top of the mold core, ensuring the tilting and separation of the split mold core and avoiding scratches or damage to the forging or mold during demolding.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a structural schematic diagram of the post-mold opening stage of this utility model; Figure 2 This is a structural schematic diagram of the present invention during the mold-opening stage; Figure 3 This is a schematic diagram of the initial structure of the mold opening of this utility model; Figure 4 This is a schematic diagram of the tensioning mechanism and the split mold core of this utility model; Figure 5 This is a schematic diagram of the positioning guide post and guide sleeve hole of this utility model.

[0023] The reference numerals and names in the figure are as follows: 10 Upper die assembly; 11 Composite ejector block; 12 Upper template; 13 Guide sleeve hole; 14 Side extrusion inclined block; 15 Split die core; 16 First die core; 17 Second die core; 20 Lower die assembly; 21 Lower template; 22 Positioning guide post; 23 Lower die punch; 30 Pulling mechanism; 31 First support arm; 32 Conversion crossbar; 33 Second support arm; 34 First mechanism; 35 Second mechanism. Detailed Implementation

[0024] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] Please see Figures 1 to 5 This utility model provides a forging part split demolding device, which uses a simple connecting rod pulling mechanism to convert the vertical demolding stroke of the upper template into the lateral opening action of the split mold core, effectively solving the problem of difficult demolding of forging parts with convex ring structure.

[0026] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] I. Example 1: Basic Structure and Linkage Pull-out Mechanism This embodiment describes the core structure of this utility model, namely how the pulling mechanism achieves lateral demolding of the split mold core.

[0028] 1. Device Composition This device includes an upper mold assembly 10 and a lower mold assembly 20.

[0029] Lower die assembly 20: It is provided with a lower template 21 and a lower die punch 23. The lower die punch 23 is fixed to the lower template 21 and is used to support the bottom of the forging.

[0030] Upper mold assembly 10: It is provided with an upper template 12, a side extrusion wedge block 14 and at least two sets of separate mold cores 15 / 16 / 17.

[0031] The lower template 21 is provided with positioning guide posts 22 at its four corners, and the upper template 12 is provided with guide sleeve holes 13 at the corresponding positions. The positioning guide posts 22 and guide sleeve holes 13 cooperate with each other to guide the movement of the upper template 12.

[0032] The side extrusion wedge 14 is driven downward by the upper template 12, and transmits lateral force through the inclined surface to drive the split mold core to close and extrude to form the convex ring of the forging.

[0033] 2. Pulling mechanism (linkage mechanism) The upper mold assembly 10 is equipped with a pulling mechanism to assist the split mold core in lateral demolding operations. For example... Figure 3 and Figure 4 As shown, the traction mechanism (including 31, 32, and 33) specifically includes: First arm 31: One end is fixed to the bottom of the upper template 12, and the other end extends downward to form a free end.

[0034] The second arm 33 has one end fixed to the bottom of the split mold core 15, and the other end extends downward to form a free end.

[0035] The transition bar 32 is rotatably connected (hinged) at both ends to the free ends of the first arm 31 and the second arm 33, respectively.

[0036] 3. Demolding action (mold opening) After forging is completed, the upper mold plate 12 begins to move upwards to demold.

[0037] Transmission conversion: The first arm 31 moves upward following the upper template 12, which drives one end of the conversion crossbar 32, which is rotatably connected to it, to move upward synchronously.

[0038] Lateral tension is generated due to the geometric positional relationship of the connecting rods (e.g., Figures 1 to 3 As shown), the conversion crossbar 32 forms an oblique transmission rod structure, thereby driving the other end of the conversion crossbar 32 to move outward.

[0039] Mold core separation: The conversion crossbar 32 transmits the external pulling force to the second support arm 33, which in turn drives the bottom of the split mold core 15 fixed thereon to tilt outward or rotate.

[0040] Separation from the convex ring: The lower part of the split mold core 15 expands outward, causing the groove on its inner sidewall to separate from the convex ring on the outer periphery of the forging, thus completing the separation operation of the multiple split mold cores.

[0041] Overall demolding: Subsequently, the separate mold cores continue to move upwards following the upper mold plate (e.g.) Figure 1 As shown in the figure, complete the overall demolding operation.

[0042] II. Example 2: Composite Top Block Driven by Hydraulic Cylinder (Active Pressing) Based on Embodiment 1, this embodiment adds a hydraulically driven composite top block 11 to ensure that sufficient top pressure is applied to limit the mold core when it is laterally opened.

[0043] 1. Composition of the composite mechanism The upper mold assembly 10 is also provided with a composite top block 11, which is used to press the split mold core.

[0044] The composite top block 11 is connected to the upper template 12 via an independent stroke drive and a synchronously following composite mechanism.

[0045] The upper mold assembly 10 is equipped with a demolding hydraulic cylinder (not shown in the figure), which is installed in the mounting cavity of the upper mold plate 12.

[0046] The top of the composite top block 11 is mounted on the piston end of the demolding hydraulic cylinder.

[0047] 2. Demolding process (composite ejector block action) The demolding process is divided into two stages: Active push-out phase (initial separation, such as...) Figure 3 (as shown) During demolding, the hydraulic cylinder extends first, pushing the composite top block 11 downwards to apply top pressure to limit the split mold core 15.

[0048] This top pressure, combined with the pulling mechanism, allows the split mold core 15 to separate to both sides around its upper part (or fulcrum) when subjected to lateral tension, smoothly detaching from the convex ring of the forging and avoiding scratches on the forging.

[0049] Synchronous follow-up stage (overall mold opening, such as...) Figure 1 (as shown) Once the split mold core 15 is separated to a safe distance, the hydraulic cylinder stroke reaches its limit.

[0050] At this time, the upper template 12 is driven upward by the main drive of the forging press, and the composite top block 11 is driven to move upward synchronously through the fixed relationship between the hydraulic cylinder body and the upper template 12.

[0051] The composite top block 11 moves upward a longer distance following the upper template 12, completing the overall demolding operation of the forging.

[0052] III. Example 3: Spring-driven composite top block (pre-tightening top pressure) This embodiment provides a simplified solution that does not require additional hydraulic drive. Based on Embodiment 1, a pre-tightening spring is used to drive the composite top block 11 to achieve the top pressure function.

[0053] 1. Composition of the composite mechanism The composite top block 11 is installed in the guide slide of the upper template 12.

[0054] A preload spring (not shown in the figure) is provided between the guide slide and the composite top block 11.

[0055] 2. Demolding process (composite ejector block action) The demolding process is also divided into two stages: Active push-out phase (initial separation): In the initial demolding stage, the upper mold plate 12 is moved up slightly (e.g. Figure 3 (As shown).

[0056] Due to the preload of the spring, when the upper template 12 begins to move upward, the spring releases the preload, pushing the composite top block 11 downward to press against the split mold core.

[0057] During this stage, the guide slide of the upper template 12 slides relative to the composite top block 11. The composite top block 11 acts as a restraint, assisting the lateral opening of the split mold core.

[0058] Synchronous follow-up stage (overall mold opening): After the split mold cores separate, the composite top block 11 reaches the lower limit.

[0059] At this point, the slide block and the composite top block 11 form a rigid connection, and move upward synchronously with the upper template 12 (e.g., Figure 1 As shown in the figure, complete the overall mold opening operation.

[0060] IV. Additional Examples (Number of Mold Cores) Regardless of which embodiment of the demolding mechanism is used, the specific number of sets of split mold cores can be adapted to the size and specifications of the forging. For example, it can be divided into two sets of mold cores, which are rotated apart from both sides to form demolding; or it can be divided into four sets of mold cores, which are rotated apart from the four sides of the upper mold plate to form demolding.

[0061] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A forging part split demolding device, comprising a lower die assembly (20) and an upper die assembly (10) movable vertically relative to the lower die assembly (20), characterized in that: The lower die assembly (20) is provided with a lower template (21) and a lower die punch (23) for supporting the bottom of the forging part; the upper die assembly (10) is provided with an upper template (12), a side extrusion wedge (14) and at least two sets of split die cores (15); the side extrusion wedge (14) is connected to the upper template (12) and is used to drive the split die cores to close towards the center to form a forging cavity through inclined surface cooperation during the die closing process; the upper die assembly (10) is also provided with a pulling mechanism, which is connected between the upper template (12) and the split die cores; during the die opening stroke when the upper template (12) moves upward, the pulling mechanism converts the longitudinal displacement of the upper template into a lateral pulling force that pulls the split die cores away from the forging part, so that the split die cores are separated from the forging part.

2. The forging part split demolding device according to claim 1, characterized in that, The pulling mechanism includes a first arm (31), a conversion crossbar (32), and a second arm (33); the upper end of the first arm (31) is fixedly connected to the upper template (12); the upper end of the second arm (33) is fixedly connected to the split mold core; the two ends of the conversion crossbar (32) are rotatably connected to the lower ends of the first arm (31) and the second arm (33), respectively; in the mold closing state, the first arm (31) is located outside the second arm (33), so that when the upper template moves upward, the second arm (33) is pulled outward by the conversion crossbar (32).

3. The forging part split demolding device according to claim 1, characterized in that, The upper mold assembly (10) is also provided with a composite top block (11), which is located on the inner top of the side extrusion wedge block (14). In the initial stage of the mold opening stroke, the composite top block (11) presses against the top surface of the split mold core, restricting the split mold core from moving upward with the upper mold plate, and cooperating with the pulling mechanism to make the split mold core tilt and separate relative to the composite top block (11).

4. The forging part split demolding device according to claim 3, characterized in that, The composite top block (11) is installed on the upper template (12) by an independent stroke drive mechanism; the independent stroke drive mechanism is configured to: drive the composite top block (11) to extend downward relative to the upper template (12) in the early stage of mold opening to maintain the pressure on the split mold core, and drive the composite top block (11) to move upward synchronously with the upper template (12) in the later stage of mold opening after the split mold core is separated.

5. The forging part split demolding device according to claim 4, characterized in that, The independent stroke drive mechanism includes a demolding hydraulic cylinder disposed on the upper template (12), and the piston rod end of the demolding hydraulic cylinder is connected to the composite top block (11).

6. The forging part split demolding device according to claim 4, characterized in that, The independent stroke drive mechanism includes a guide slide and a pre-tightening spring disposed on the upper template (12); the composite top block (11) is slidably mounted on the guide slide, and the pre-tightening spring is disposed between the slide and the composite top block, for releasing the pre-tightening force at the initial stage of mold opening to push the composite top block downward.

7. The forging part split demolding device according to claim 1, characterized in that, The inner wall of the side extrusion wedge (14) is provided with an inner conical surface, and the outer wall of the split mold core is provided with an outer conical surface that mates with the inner conical surface; the inner wall of the split mold core is provided with a forming groove for forming the outer peripheral convex ring structure of the forging part.

8. The forging part split demolding device according to claim 1, characterized in that, The number of the split mold cores is two, three or four, and the split mold cores are spliced ​​together along the circumference of the forging; each set of split mold cores is connected to the upper template through at least one set of the pulling mechanism.

9. The forging part split demolding device according to claim 1, characterized in that, The lower template (21) is provided with a positioning guide post (22), and the upper template (12) is provided with a guide sleeve hole (13) that cooperates with the positioning guide post (22) to guide the mold closing and opening movements of the upper and lower mold assemblies (20).

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