Wheel hub bearing forging lock catch die sleeve guide mechanism and using method thereof

Abstract

The invention relates to the technical field of a hub bearing forging lock catch die sleeve guide mechanism and a using method thereof, and discloses a hub bearing forging lock catch die sleeve guide mechanism which comprises an upper die assembly, a lower die assembly, a self-adaptive guide structure, a double-locking structure and a flexible demolding structure. The upper die assembly comprises an upper connecting plate, an upper die bottom plate, an upper core die and an upper die sleeve, the upper die bottom plate is fixedly connected to the bottom face of the upper connecting plate, and the upper core die is of a columnar structure and is perpendicularly and fixedly connected to the center of the bottom face of the upper die bottom plate. According to the hub bearing forging lock catch die sleeve guide mechanism and the using method thereof, the self-adaptive guide structure is matched with the conical surface of the conical guide boss through the elastic guide piece, thermal expansion is counteracted through deformation of the elastic guide piece, the guide gap is stabilized to be 0.02-0.06 mm (the thermal state fluctuation is smaller than or equal to 0.02 mm), and the size out-of-tolerance rate of more than 10000 forgings produced continuously is still smaller than 2%.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hub bearing forging lock sleeve guide mechanism, in particular to a kind of hub bearing forging lock sleeve guide mechanism and its using method. BACKGROUND

[0002] The hub bearing forging lock sleeve guide mechanism is a kind of key device applied in the process of hub bearing forging, mainly used for guaranteeing the accurate positioning and stable operation of the mold.

[0003] There are many kinds of similar hub bearing forging lock sleeve guide mechanism devices, for example, a harvester hub bearing sleeve assembly device disclosed in Chinese patent CN103786013A, which includes a pressure head and other structures, but in fact there are still three major core defects: first, the guide structure is mostly rigid boss and groove cooperation, due to the difference in thermal expansion coefficient, the guide clearance fluctuates greatly (0.02-0.05mm in cold state, 0.08-0.12mm in hot state), which leads to high size tolerance of the forged piece; second, the locking relies on single flat step clamping, and the locking surface is prone to wear and looseness due to equipment vibration, which requires frequent maintenance; third, the rigid ejector pin is used for demolding, which is easy to cause top injury to thin-walled forged pieces, and the adaptability is poor. The existing technology has not effectively optimized the above problems, and it is difficult to meet the demand of efficient and high-precision forging, so a kind of hub bearing forging lock sleeve guide mechanism and its using method are proposed to solve the above problems. SUMMARY

[0004] (I) Technical problems solved In view of the deficiencies of the prior art, the present application provides a kind of hub bearing forging lock sleeve guide mechanism and its using method, with the advantages of high stability, which solves the problem of poor stability.

[0005] (II) Technical solutions To achieve the above-mentioned purpose of high stability, the present application provides the following technical solutions: a kind of hub bearing forging lock sleeve guide mechanism, comprising upper die assembly, lower die assembly, self-adaptive guide structure, double locking structure and flexible demolding structure.

[0006] The upper die assembly includes an upper connecting plate, an upper die bottom plate, an upper core die and an upper die sleeve.

[0007] The upper die bottom plate is fixedly connected to the bottom surface of the upper connecting plate, the upper core die is a columnar structure and is fixedly connected to the center of the bottom surface of the upper die bottom plate vertically, and the upper die sleeve is a ring-shaped cylinder and is coaxially sleeved outside the upper core die, and the top end of the upper die sleeve is fixedly connected to the bottom surface of the upper die bottom plate.

[0008] The lower die assembly includes a lower connecting plate and a lower die; the lower die is a columnar structure and is fixedly connected to the center of the top surface of the lower connecting plate vertically, the lower die is coaxially arranged with the upper core die, and the top surface of the lower die is a forging working surface.

[0009] The self-adapting guiding structure comprises an elastic guide and a conical guiding boss.

[0010] The elastic guide is annular and fixedly embedded in the inner wall groove of the upper die sleeve, the inner wall of the elastic guide is provided with a lubricating structure, and the conical guiding boss is integrally formed on the outer side wall of the lower die.

[0011] The double locking structure comprises a wedge-shaped locking unit and an elastic clamping unit; the wedge-shaped locking unit comprises a wedge-shaped locking part integrally formed on the bottom edge of the upper core die and a wedge-shaped locking groove formed on the lower part of the inner wall of the upper die sleeve, and the wedge-shaped locking part and the wedge-shaped locking groove are engaged and matched.

[0012] The elastic clamping unit comprises at least two elastic clamping pins uniformly distributed along the circumference of the upper die sleeve, the outer side wall of the upper die sleeve is provided with mounting holes matched with the elastic clamping pins, the outer side wall of the upper core die is provided with annular clamping grooves corresponding to the elastic clamping pins, and the end part of the elastic clamping pin can be embedded in the annular clamping groove.

[0013] The flexible demolding structure comprises an upper ejector, a lower ejector, a buffer ejector head and a length adjusting unit.

[0014] The upper ejector is coaxially arranged in the first center hole of the upper core die, and the lower ejector is coaxially arranged in the second center hole of the lower die; the buffer ejector head is detachably connected to the bottom end of the upper ejector and the top end of the lower ejector; the length adjusting unit is arranged on the rod body of the upper ejector and the lower ejector, and is used for adjusting the effective ejection length of the ejector.

[0015] Preferably, the elastic guide is an elastic metal, the hardness of the elastic guide is HRC40-50, the lubricating structure is an annular oil groove, the annular oil groove is filled with high-temperature-resistant lubricating medium, and the elastic guide and the inner wall groove of the upper die sleeve are in interference fit, and the interference fit gap is 0.003-0.01mm.

[0016] Preferably, the conical guiding boss is a cylindrical structure with multiple conical bodies at the top, and the fitting gap between the conical guiding boss and the elastic guide is 0.02-0.06mm.

[0017] Preferably, the inclination angle of the wedge-shaped locking part is 10°-15°, the working surface roughness of the wedge-shaped locking part is between Ra1.6-Ra2.2, and the number of the elastic clamping pins is 3-4.

[0018] Preferably, the material of the buffer ejector head is wear-resistant elastic material, the wear-resistant elastic material is polyether ether ketone, modified nylon or polyurethane, the end face of the buffer ejector head is provided with anti-skid lines, the depth of the anti-skid lines is 0.3-0.8mm, and the width is 0.8-1.2mm.

[0019] Preferably, the length adjusting unit is an adjusting screw, axial threaded holes are formed in the middle of the rod bodies of the upper and lower ejecting pieces, the adjusting screw is threadedly connected in the axial threaded holes, and the effective ejecting length adjusting range of the upper and lower ejecting pieces is 0-15 mm.

[0020] Preferably, the upper core and the upper die sleeve are made of normal die steel, the hardness of the upper core and the upper die sleeve is HRC 55-62, the material of the lower die is hot work die steel, and the hardness of the lower die is HRC 48-55.

[0021] Preferably, the upper and lower ejecting pieces are made of alloy structural steel, and the hardness of the upper and lower ejecting pieces after quenching and tempering is HRC 28-35.

[0022] Preferably, the upper connecting plate, the upper die bottom plate and the lower connecting plate are made of medium carbon steel, the hardness of the upper connecting plate, the upper die bottom plate and the lower connecting plate after quenching and tempering is HRC 25-32, and the upper connecting plate, the upper die bottom plate and the lower connecting plate are plate-shaped structures suitable for forging equipment.

[0023] A use method of a hub bearing forging locking die sleeve guide mechanism, the use method comprises the following steps of using the hub bearing forging locking die sleeve guide mechanism according to claim 1. S1. Preparation before forging: According to the thickness of the hub bearing workpiece to be forged, the effective ejecting length of the upper and lower ejecting pieces is adjusted to a suitable size through the length adjusting unit, the buffer ejector is installed, and the die is preheated to 180-220 DEG C. S2. Blank placement: The hub blank heated to 1050-1250 DEG C is placed on the top surface of the lower die, and the anti-skid pattern of the buffer ejector prevents the blank from deviating. S3. Guiding and locking: The upper die assembly goes down, the conical guide boss of the lower die gradually inserts the elastic guide piece of the upper die sleeve, the elastic guide piece self-adapts deformation to keep the guiding precision, and meanwhile, the wedge-shaped locking part of the upper core is engaged with the wedge-shaped locking groove of the upper die sleeve, and the elastic pin is embedded in the annular clamping groove to complete double locking. S4. Forging and demolding: After the upper core and the lower die cooperate to complete forging, the upper die assembly goes up, the upper and lower ejecting pieces are synchronously ejected, the buffer ejector stably ejects the workpiece away from the die, and the forging cycle is completed.

[0024] (Three) Beneficial effects Compared with the prior art, the present application provides a hub bearing forging locking die sleeve guide mechanism and a use method thereof, and has the following beneficial effects: 1. The wheel hub bearing forging lock sleeve guide mechanism and its use method, the self-adaptive guide structure cooperates with the taper surface of the tapered guide boss through the elastic guide piece, the deformation of the elastic guide piece offsets the thermal expansion, the guide gap is stabilized at 0.02-0.06mm (thermal state fluctuation ≤0.02mm), and the size out-of-tolerance rate of more than 10000 forged pieces in continuous production is still <2%.

[0025] 2. The wheel hub bearing forging lock sleeve guide mechanism and its use method, the self-locking property of the double locking structure combined with the wedge-shaped locking part and the wedge-shaped locking slot engagement and the anti-loosening effect of the elastic pin and the annular clamping groove cooperation, the locking loosening rate is <5%, the mold maintenance cycle is prolonged by more than 3 times, and the effective operation rate of the equipment is increased by 20%-25%.

[0026] 3. The wheel hub bearing forging lock sleeve guide mechanism and its use method, the flexible demolding structure avoids stress concentration through the buffer ejector, cooperates with the length adjusting unit to adapt to forged pieces of different thicknesses (3-20mm), the forging top injury rejection rate is <1.5%, and the tooling replacement cost is reduced by 60%. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The figure is a structural schematic diagram of the present application; Figure 2 The figure is an explosion schematic diagram of the present application; Figure 3 The figure is a bottom side view of the present application; Figure 2 The figure is an enlarged view of A in the present application. Figure 4 Figure 3 The figure is an enlarged view of A in the present application.

[0028] In the figure: 1, upper connecting plate; 2, upper die bottom plate; 3, upper core die; 31, wedge-shaped locking part; 32, annular clamping groove; 33, first center hole; 4, upper die sleeve; 41, inner wall groove; 42, wedge-shaped locking slot; 43, mounting hole; 5, lower connecting plate; 6, lower die; 61, second center hole; 7, elastic guide piece; 71, lubrication structure; 8, tapered guide boss; 9, elastic pin; 10, upper ejector; 11, lower ejector; 12, buffer ejector; 13, length adjusting unit. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] Please refer to Figures 1-4 ​To achieve the above purpose of high stability, the present application provides the following technical solutions: a hub bearing forging lock buckle die sleeve guide mechanism, comprising an upper die assembly, a lower die assembly, a self-adaptive guide structure, a double locking structure and a flexible demolding structure.

[0031] The upper die assembly comprises an upper connecting plate 1, an upper die base plate 2, an upper core die 3 and an upper die sleeve 4.

[0032] The upper die base plate 2 is fixedly connected to the bottom surface of the upper connecting plate 1, the upper core die 3 is a columnar structure and is fixedly connected to the center of the bottom surface of the upper die base plate 2 vertically, and the upper die sleeve 4 is an annular cylindrical structure and is coaxially sleeved outside the upper core die 3, and the top end of the upper die sleeve 4 is fixedly connected to the bottom surface of the upper die base plate 2.

[0033] The lower die assembly comprises a lower connecting plate 5 and a lower die 6; the lower die 6 is a columnar structure and is fixedly connected to the center of the top surface of the lower connecting plate 5 vertically, the lower die 6 is coaxially arranged with the upper core die 3, and the top surface of the lower die 6 is a forging working surface.

[0034] The self-adaptive guide structure comprises an elastic guide piece 7 and a conical guide boss 8.

[0035] The elastic guide piece 7 is annular and is fixedly embedded in the inner wall groove 41 of the upper die sleeve 4, the inner wall of the elastic guide piece 7 is provided with a lubricating structure 71, the conical guide boss 8 is integrally formed on the outer side wall of the lower die 6, and the conical guide boss 8 and the wall surface of the elastic guide piece 7 form a matching conical surface.

[0036] The double locking structure comprises a wedge-shaped locking unit and an elastic clamping unit; the wedge-shaped locking unit comprises a wedge-shaped locking portion 31 integrally formed on the bottom edge of the upper core die 3, and a wedge-shaped locking groove 42 opened in the lower part of the inner wall of the upper die sleeve 4, and the wedge-shaped locking portion 31 and the wedge-shaped locking groove 42 are engaged and matched.

[0037] The elastic clamping unit comprises at least two elastic clamping pins 9 uniformly distributed along the circumference of the upper die sleeve 4, the outer side wall of the upper die sleeve 4 is provided with mounting holes 43 matched with the elastic clamping pins 9, and the outer side wall of the upper core die 3 is provided with an annular clamping groove 32 corresponding to the elastic clamping pins 9, and the end of the elastic clamping pin 9 can be embedded in the annular clamping groove 32.

[0038] The flexible demolding structure comprises an upper ejector 10, a lower ejector 11, a buffer ejector head 12 and a length adjusting unit 13.

[0039] The upper ejector 10 is coaxially arranged in the first center hole 33 of the upper core die 3, and the lower ejector 11 is coaxially arranged in the second center hole 61 of the lower die 6.

[0040] The buffer ejector head 12 is detachably connected to the bottom end of the upper ejector 10 and the top end of the lower ejector 11.

[0041] The length adjusting unit 13 is arranged on the rod body of the upper ejector 10 and the lower ejector 11, and is used for adjusting the effective ejecting length of the ejector.

[0042] It can be understood from the above embodiments that: 1. The upper connecting plate 1 and the upper mold base plate 2 are made of medium carbon steel and heat-treated, and processed into rectangular plates suitable for forging equipment; the upper core mold 3 and the upper mold sleeve 4 are made of mold steel and quenched. The upper core mold 3 is cylindrical. The depth of the groove 41 on the inner wall of the upper mold sleeve 4 is compatible with the thickness of the elastic guide 7. The material and structure of the lower connecting plate 5 are the same as those of the upper connecting plate 1. The lower mold 6 is made of hot work mold steel that has been quenched.

[0043] 2. The elastic guide 7 is made of elastic metal with a hardness of HRC40-50. The lubrication structure 71 is an annular oil groove with built-in high-temperature grease. The elastic guide 7 is interference-fitted into the inner wall groove 41 of the upper mold sleeve 4.

[0044] 3. The wedge-shaped locking part 31 has an inclination angle of 10°-15° and a working surface roughness Ra≤1.6; the elastic locking pin 9 includes a screw, a spring and a carbide pin head, and three are evenly arranged along the circumference of the upper mold sleeve 4. The mounting hole 43 is a threaded hole and the annular groove 32 has a depth of 2-3mm.

[0045] 4. The upper ejector component 10 and the lower ejector component 11 are made of alloy structural steel with heat treatment; the buffer head 12 is made of wear-resistant elastic material such as PEEK or modified nylon, and the end face is provided with anti-slip texture; the length adjustment unit 13 is a threaded adjustment screw, and the length adjustment range of 0-15mm is adjusted by screwing it into the axial threaded hole of the upper ejector component 10 and the lower ejector component 11.

[0046] 5. The coaxiality of the upper core mold 3 and the lower mold 6 is ≤0.01mm, the clearance between the elastic guide 7 and the tapered guide boss 8 is 0.02-0.06mm, and the radial movement of the upper core mold 3 after the elastic locking pin 9 is embedded in the annular locking groove 32 is ≤0.005mm.

[0047] The working principle of this embodiment is as follows: Based on the thickness of the wheel hub bearing forging, the effective ejection lengths of the upper ejector 10 and lower ejector 11 are adjusted to suitable dimensions using the length adjustment unit 13. The buffer mandrel 12 is installed, and the mold is preheated to 180-220℃. Subsequently, the wheel hub blank heated to 1050-1250℃ is placed on the top surface of the lower mold 6. The anti-slip texture of the buffer mandrel 12 prevents the blank from shifting. The upper mold assembly moves downward, and the tapered guide boss 8 of the lower mold 6 gradually inserts into the elastic guide 7 of the upper mold sleeve 4. The elastic guide 7 adapts to deformation to maintain guiding accuracy. At the same time, the wedge-shaped locking part 31 of the upper core mold 3 engages with the wedge-shaped locking groove 42 of the upper mold sleeve 4, and the elastic locking pin 9 is embedded in the annular locking groove 32 to complete the double locking. When demolding is required, after the upper core mold 3 and the lower mold 6 cooperate to complete the forging, the upper mold assembly moves upward, and the upper ejector 10 and lower ejector 11 are ejected synchronously. The buffer mandrel 12 smoothly pushes the forging away from the mold, completing the forging cycle.

[0048] It has to be noted that, in the present document, the terms "first", "second", etc. merely serve to identify a subject or action, without necessarily requiring or implying any such actual relationship or order between such subjects or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0049] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since numerous further modifications and changes can be apparent to one skilled in the art without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. A guide mechanism for a forged locking die sleeve in a wheel hub bearing, characterized in that, It includes an upper mold assembly, a lower mold assembly, an adaptive guiding structure, a double locking structure, and a flexible demolding structure; The upper mold assembly includes an upper connecting plate (1), an upper mold base plate (2), an upper core mold (3), and an upper mold sleeve (4). The upper mold base plate (2) is fixed to the bottom surface of the upper connecting plate (1), the upper core mold (3) is a columnar structure and is vertically fixed to the center of the bottom surface of the upper mold base plate (2), the upper mold sleeve (4) is an annular cylindrical shape and is coaxially sleeved on the outside of the upper core mold (3), and the top of the upper mold sleeve (4) is fixed to the bottom surface of the upper mold base plate (2). The lower mold assembly includes a lower connecting plate (5) and a lower mold (6); the lower mold (6) is a columnar structure and is vertically fixed to the center of the top surface of the lower connecting plate (5). The lower mold (6) is coaxially arranged with the upper core mold (3), and the top surface of the lower mold (6) is the forging working surface. The adaptive guide structure includes an elastic guide (7) and a tapered guide boss (8). The elastic guide (7) is annular and is fixedly embedded in the inner wall groove (41) of the upper mold sleeve (4). The inner wall of the elastic guide (7) is provided with a lubrication structure (71). The conical guide boss (8) is integrally formed on the outer wall of the lower mold (6). The conical guide boss (8) and the wall surface of the elastic guide (7) form a matching conical surface fit. The double locking structure includes a wedge locking unit and an elastic clamping unit; the wedge locking unit includes a wedge locking part (31) integrally formed on the bottom edge of the upper core mold (3) and a wedge locking groove (42) opened on the lower part of the inner wall of the upper mold sleeve (4), the wedge locking part (31) and the wedge locking groove (42) are properly engaged; The elastic clamping unit includes at least two elastic pins (9) evenly distributed along the circumference of the upper mold sleeve (4). The outer wall of the upper mold sleeve (4) is provided with mounting holes (43) that are adapted to the elastic pins (9). The outer wall of the upper core mold (3) is provided with an annular groove (32) corresponding to the elastic pins (9). The end of the elastic pin (9) can be inserted into the annular groove (32). The flexible demolding structure includes an upper ejector (10), a lower ejector (11), a buffer ejector (12), and a length adjustment unit (13). The upper ejector (10) is coaxially inserted through the first center hole (33) of the upper core mold (3), and the lower ejector (11) is coaxially inserted through the second center hole (61) of the lower mold (6); the buffer ejector (12) is detachably connected to the bottom end of the upper ejector (10) and the top end of the lower ejector (11); the length adjustment unit (13) is provided on the rod of the upper ejector (10) and the lower ejector (11) and is used to adjust the effective ejection length of the ejector.

2. The wheel hub bearing forging locking die sleeve guide mechanism according to claim 1, characterized in that: The elastic guide (7) is made of elastic metal and has a hardness of HRC40-50. The lubrication structure (71) is an annular oil groove filled with a high-temperature resistant lubricating medium. The elastic guide (7) and the inner wall groove (41) of the upper mold sleeve (4) are interference fits with an interference fit clearance of 0.003-0.01mm.

3. The wheel hub bearing forging locking die sleeve guide mechanism according to claim 1, characterized in that: The tapered guide boss (8) is a cylindrical structure with multiple tapered bodies on the top, and the fitting gap between the tapered guide boss (8) and the elastic guide (7) is 0.02-0.06mm.

4. The wheel hub bearing forging locking die sleeve guide mechanism according to claim 1, characterized in that: The inclination angle of the wedge-shaped locking part (31) is 10°-15°, the surface roughness of the wedge-shaped locking part (31) is between Ra1.6 and Ra2.2, and the number of elastic locking pins (9) is 3-4.

5. The wheel hub bearing forging locking die sleeve guide mechanism according to claim 1, characterized in that: The buffer head (12) is made of wear-resistant elastic material, which is polyetheretherketone, modified nylon or polyurethane. The end face of the buffer head (12) is provided with anti-slip texture, the depth of which is 0.3-0.8mm and the width of which is 0.8-1.2mm.

6. The wheel hub bearing forging locking die sleeve guide mechanism according to claim 1, characterized in that: The length adjustment unit (13) is an adjustment screw. The upper ejector (10) and the lower ejector (11) have axial threaded holes in the middle of their rods. The adjustment screw is threaded into the axial threaded holes. The effective ejection length adjustment range of the upper ejector (10) and the lower ejector (11) is 0-15mm.

7. The wheel hub bearing forging locking die sleeve guide mechanism according to claim 1, characterized in that: The upper core mold (3) and upper mold sleeve (4) are made of normal mold steel, and the hardness of the upper core mold (3) and upper mold sleeve (4) is HRC55-62; the lower mold (6) is made of hot work mold steel, and the hardness of the lower mold (6) is HRC48-55.

8. The wheel hub bearing forging locking die sleeve guide mechanism according to claim 1, characterized in that: The upper top material (10) and the lower top material (11) are made of alloy structural steel, and the hardness of the upper top material (10) and the lower top material (11) after quenching and tempering is HRC28-35.

9. The wheel hub bearing forging locking die sleeve guide mechanism according to claim 1, characterized in that: The upper connecting plate (1), the upper die base plate (2) and the lower connecting plate (5) are all made of medium carbon steel. The hardness of the upper connecting plate (1), the upper die base plate (2) and the lower connecting plate (5) after quenching and tempering is HRC25-32. The upper connecting plate (1), the upper die base plate (2) and the lower connecting plate (5) are plate structures adapted to forging equipment.

10. A method of using a guide mechanism for a forging locking die sleeve in a wheel hub bearing, characterized in that, The guide mechanism for a wheel hub bearing forging locking die sleeve as described in claim 1 includes the following steps: Preparations before S1 forging: According to the thickness of the wheel hub bearing forging, the effective ejection length of the upper ejector (10) and lower ejector (11) is adjusted to the appropriate size through the length adjustment unit (13), the buffer head (12) is installed, and the mold is preheated to 180-220℃; S2 billet placement: The wheel hub blank heated to 1050-1250℃ is placed on the top surface of the lower mold (6), and the anti-slip texture of the buffer top head (12) prevents the blank from shifting. S3 Guiding and Locking: As the upper mold assembly moves downward, the tapered guide boss (8) of the lower mold (6) gradually inserts into the elastic guide member (7) of the upper mold sleeve (4). The elastic guide member (7) adapts to deformation to maintain guiding accuracy. At the same time, the wedge-shaped locking part (31) of the upper core mold (3) engages with the wedge-shaped locking groove (42) of the upper mold sleeve (4), and the elastic pin (9) is embedded in the annular groove (32) to complete the double locking. S4. Forging and Demolding: After the upper core mold (3) and the lower mold (6) cooperate to complete the forging, the upper mold assembly moves upward, the upper ejector (10) and the lower ejector (11) are ejected synchronously, and the buffer ejector (12) smoothly ejects the forging from the mold, completing the forging cycle.

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