An elbow hot stamping forming device and forming process for an ultra-thick-wall super duplex steel plate

Abstract

The present application relates to hot stamping forming technical field, disclose a kind of super-thick wall super duplex steel plate bend hot stamping forming device and forming process, including mould base, its inside is provided with cavity and recess, recess includes cavity and cavity, the bottom of cavity is provided with the through-hole being communicated with cavity;Cavity upper and lower sides are respectively communicated with the upper surface of mould base and the upper surface of cavity;Cooling demoulding assembly includes ejector plate, it slides in through-hole;Flow passage one is opened in the inside of ejector plate;Multiple water jet ports one, its bottom is communicated with flow passage one, and it is interval arranged in the top of ejector plate along the length direction of ejector plate;Multiple driving members are used to drive ejector plate to move in vertical direction.The present application reduces cooling dead angle, improves the heat dissipation speed of half elbow, and also reduces thermal stress through uniform temperature field control, so that half elbow rapidly shrinks before demoulding to reduce the tightness, thereby reduce the demoulding difficulty and improve the forming quality.

Description

Technical Field

[0001] This invention relates to the field of hot stamping forming technology, and more specifically, to a hot stamping forming device and forming process for elbows made of ultra-thick-walled super duplex steel plates. Background Technology

[0002] Super duplex steel elbows, possessing both austenitic and ferritic dual-phase microstructures, offer superior mechanical properties and corrosion resistance, making them widely used in pipeline systems operating under harsh conditions such as petrochemicals and marine engineering. Hot stamping is a common manufacturing process for these elbows, involving the placement of heated steel plates into a mold for shaping.

[0003] During the hot stamping process of ultra-thick-walled super duplex steel elbows, when the elbow cools and shrinks in the mold after forming, it will generate a large clamping force with the cavity. Especially for ultra-thick-walled parts, the heat in the core is difficult to dissipate quickly, making demolding extremely difficult.

[0004] In existing technologies, elbows are usually lifted from both sides using clamps, which can easily cause deformation on both sides of the elbow. In addition, existing water cooling mechanisms usually spray water from above the elbow, which can easily lead to uneven cooling of the elbow and affect its quality.

[0005] To address this, we propose a hot stamping forming device and forming process for elbows made of ultra-thick-walled super duplex steel plates. Summary of the Invention

[0006] This invention provides a hot stamping forming device and forming process for ultra-thick-walled super duplex steel plate elbows, solving the technical problem in related technologies where elbows are lifted from both sides using clamps, which easily causes deformation on both sides of the elbow.

[0007] This invention provides a hot stamping forming device for ultra-thick-walled super duplex steel plate elbows, comprising a mold base with a cavity and a groove inside. The groove includes a cavity with a semi-circular cross-sectional shape adapted to the shape of the elbow. A through hole communicating with the cavity is formed at the bottom of the cavity along its length. A hollow cavity has a rectangular cross-sectional shape, and its upper and lower sides are respectively connected to the upper surface of the mold base and the upper surface of the cavity. A cooling and demolding assembly includes an ejector plate that slides vertically within the through hole, with its length direction along the length direction of the through hole. A flow channel is formed inside the ejector plate, with an inlet and an outlet at its two ends. Multiple spray nozzles are spaced apart at the top of the ejector plate along its length direction, and their bottoms communicate with the flow channel. Multiple driving components are disposed in the cavity, with their telescopic ends fixedly connected to the bottom of the ejector plate for driving the ejector plate to move vertically.

[0008] As a further improvement of the present invention, the distance between two adjacent water nozzles gradually increases in the direction from the center to both sides of the top plate.

[0009] As a further improvement of the present invention, the top of the ejector plate is an arc-shaped structure with the opening facing upward, and it is concentrically arranged with the cavity.

[0010] As a further improvement of the present invention, two heat dissipation cavities are also provided in the mold base, and the two heat dissipation cavities are respectively arranged on both sides of the cavity and close to the cavity.

[0011] As a further improvement of the present invention, the hot stamping forming apparatus further includes a water cooling component 1, which includes two flow channels 2, which correspond one-to-one with the two heat dissipation cavities. The flow channels 2 are disposed on the upper side of the corresponding heat dissipation cavity. Water inlets 2 and water outlets 2 are respectively opened on both sides of the flow channels 2. A plurality of water spray nozzles 2 are distributed on the opposite side walls of the cavity and are spaced apart along the length direction of the cavity. The two sides of the water spray nozzles 2 are respectively connected to the cavity and the corresponding flow channels 2.

[0012] As a further improvement of the present invention, a plurality of water troughs I are spaced apart along the circumference of the inner wall of the cavity, and the length direction of the water troughs I is arranged along the length direction of the cavity; a plurality of water troughs II are opened along the length direction of the inner wall of the cavity, and the length direction of the water troughs II is arranged along the circumference of the cavity, and the water troughs II on the same side are connected to the plurality of water troughs I on the same side.

[0013] As a further improvement of the present invention, the hot stamping forming device further includes a water-cooling component two, which includes two flow channels three, each corresponding to one of the two heat dissipation cavities. The flow channels three are disposed between the top of the corresponding flow channel two and the top of the heat dissipation cavity. Water inlets three and water outlets three are respectively provided on both sides of the flow channels three. A plurality of water spray nozzles three are distributed on the opposite side walls of the cavity and located above the water spray nozzles two. The two sides of the water spray nozzles three are respectively connected to the cavity and the corresponding flow channels three.

[0014] As a further improvement of the present invention, in the direction from the middle to both sides of the cavity, the distance between two adjacent water nozzles 2 gradually increases; in the direction from the middle to both sides of the cavity, the distance between two adjacent water nozzles 3 gradually increases.

[0015] As a further improvement of the present invention, in the direction from the middle to both sides of the cavity, the distance between two adjacent water tanks gradually increases.

[0016] A hot stamping forming process for an ultra-thick-walled super duplex steel plate elbow includes the following steps: Step 1, after the elbow is stamped, water is simultaneously introduced through inlet 1, inlet 2, and inlet 3. The water inlet speeds of inlet 2 and inlet 3 are controlled so that the water sprayed from nozzle 2 flows along the inner wall of the cavity to the ejector plate, and the water sprayed from nozzle 3 covers the upper surface of the elbow; Step 2, multiple drive components are activated to push the ejector plate upward, thereby pushing the semi-elbow upward.

[0017] The beneficial effects of this invention are as follows: 1. This invention utilizes the flow channel one and water spray nozzle one within the ejector plate to directly and powerfully cool the bottom of the inner arc of the elbow where heat is most concentrated. Combined with water spray nozzle two and water spray nozzle three on the cavity sidewall, it provides a covering spray to the outer wall and inner surface of the semi-bent head. This combined internal and external, top and bottom surrounding cooling method, along with water tank one and water tank two on the inner wall of the cavity, reduces cooling dead zones. This not only improves the heat dissipation speed of the semi-bent head but also reduces thermal stress through uniform temperature field control, allowing the semi-bent head to shrink rapidly before demolding to reduce the clamping force, thereby reducing demolding difficulty and improving molding quality.

[0018] 2. In view of the characteristics of severe deformation and concentrated heat in the middle arc section of the semi-bent head, the present invention increases the distribution of water spray nozzles 2 and 3 in the middle section of the top plate and the corresponding position of the cavity, thereby improving the heat exchange rate in the middle section and balancing the heat dissipation rate between the middle and the two ends, effectively avoiding the differences in tissue properties and deformation caused by uneven cooling. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the main structure of the present invention; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 This is a side view of the structure of the present invention; Figure 5 This is a top view of the structure of the present invention; Figure 6 This is a schematic diagram of the first top-view cross-sectional structure of the present invention; Figure 7 This is a schematic diagram of the second top-view cross-sectional structure of the present invention; Figure 8 This is a schematic diagram of the third top-view cross-sectional structure of the present invention.

[0020] In the diagram: 1. Mold base; 11. Cavity; 12. Groove; 121. Cavity; 1211. Water tank one; 1212. Water tank two; 122. Hole; 123. Through hole; 13. Heat dissipation cavity; 2. Cooling and demolding assembly; 21. Ejector plate; 22. Runner one; 221. Inlet one; 222. Outlet one; 23. Spray nozzle one; 24. Drive component; 3. Water cooling assembly one; 31. Runner two; 311. Inlet two; 312. Outlet two; 32. Spray nozzle two; 4. Water cooling assembly two; 41. Runner three; 411. Inlet three; 412. Outlet three; 42. Spray nozzle three. Detailed Implementation

[0021] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0022] like Figures 1-8 As shown, a hot stamping forming device for ultra-thick-walled super duplex steel plate elbows includes a mold base 1 and a cooling and demolding assembly 2. It should be noted that this device is used for stamping semi-elbows; after the semi-elbows are processed, two semi-elbows are welded together to form a complete elbow. Furthermore, the upper mold and the stamping part are existing technologies. Additionally, the outer wall of the semi-elbow will be referred to as the outer surface, and the inner wall as the inner surface.

[0023] Among them, such as Figure 1 and Figure 2 As shown, the mold base 1 has a cavity 11 and a groove 12 for forming a semi-bent head inside.

[0024] The groove 12 includes a cavity 121 and a hollow cavity 122. In the direction of the front view, the cross-sectional shape of the cavity 121 is semi-circular and conforms to the outer contour of the semi-bent head to be manufactured. A through hole 123 is provided at the bottom of the cavity 121 along its length, i.e., the direction of the curved extension of the bend. This through hole 123 extends vertically downwards, connecting the cavity 121 to the chamber 11 below.

[0025] In the direction of the front view, the cavity 122 is a rectangular space located directly above the cavity 121. The lower side of the cavity 122 is completely connected to the upper part of the cavity 121, that is, the semi-circular opening end, and its upper side extends directly to the top surface of the mold base 1.

[0026] In addition, such as Figure 1 , Figure 2 and Figure 8 As shown, the cooling and demolding assembly 2 includes an ejector plate 21, a runner 22, multiple water spray nozzles 23, and multiple drive components 24. The ejector plate 21 slides vertically within the through hole 123, and the length direction of the ejector plate 21 extends along the length direction of the through hole 123.

[0027] A flow channel 22 is formed inside the top plate 21, and its two ends form an inlet 221 and an outlet 222 on the end wall of the top plate 21, respectively, for connecting to an external cooling water source and a return pipe. Multiple spray nozzles 23 are formed on the top of the top plate 21, and their bottoms communicate with the flow channel 22. The multiple spray nozzles 23 are arranged at intervals along the length of the top plate 21.

[0028] When the device is working, cooling water is pumped from the inlet 221 into the flow channel 22, and then sprayed upward through multiple nozzles 23, directly acting on the bottom of the inner arc of the bend, which is the inner bend area where the tube blank is most severely squeezed and where the heat is most concentrated during the stamping process.

[0029] The drive component 24 is fixedly connected inside the cavity 11. The drive component 24 can be a hydraulic cylinder or a pneumatic cylinder. Its telescopic end extends upward and is fixedly connected to the bottom of the ejector plate 21. When the telescopic end of the drive component 24 extends, the ejector plate 21 is pushed upward, thereby ejecting the semi-bent head upward and disengaging it from the cavity 121, thus facilitating the demolding of the semi-bent head.

[0030] Its working process and principle are as follows: It should be noted that in the hot stamping forming of ultra-thick wall elbows, the heat distribution along the length of the elbow is uneven. The middle arc section has the highest heat due to the most severe deformation, while the straight edge sections at both ends have lower heat.

[0031] When the steel plate raw material is pressed into the groove 12 at high temperature and formed into a semi-bent head in the cavity 121, the semi-bent head will quickly cool and shrink, tightly wrapping around the inner wall of the cavity 121. At this time, the drive component 24 does not move temporarily, and the cooling function of the cooling demolding component 2 is activated first. High-pressure cooling medium, such as water, enters the flow channel 22 and is ejected upward from the water spray nozzle 23 at the top of the ejector plate 21, impacting the bottom of the inner arc of the bend, that is, inserting between the bend and the inner wall of the cavity 121. On the one hand, it can directly cool the relatively hottest part of the semi-bent head, causing it to cool down rapidly and shrink in volume, thereby reducing the clamping force on the mold; on the other hand, the high-speed water flow also plays a role in physical peeling and the formation of a lubricating film layer, reducing the static friction between the semi-bent head and the inner wall of the cavity 121. After cooling for a preset time, the drive component 24 is used to smoothly push the ejector plate 21 upward, thereby facilitating the separation of the semi-bent head from the surface of the cavity 121.

[0032] As an optional embodiment, it should be noted that, since the middle part of the semi-bent head is located inside and heat dissipation is relatively slow, in order to make the heat dissipation of the middle part and both ends more uniform, the distance between two adjacent water nozzles gradually increases in the direction from the middle part of the top plate 21 towards both ends. That is, the number of water nozzles 23 in the middle section of the top plate 21 is greater than the number at both ends. This design can accelerate the heat dissipation speed of the middle part of the semi-bent head, thereby making the cooling speed of the entire semi-bent head more uniform, which helps to reduce thermal stress.

[0033] Furthermore, such as Figure 2 As shown, the top of the ejector plate 21 is an upward-opening arc-shaped structure, and it is concentrically positioned with the cavity 121. This allows the arc-shaped top surface of the ejector plate 21 to completely fit against the outer arc surface of the semi-bent head, forming a continuous, planar contact area.

[0034] When the ejector plate 21 rises, it does not push the semi-bent head with a plane or a line, but with an arc surface that completely fits its outer wall, which helps to protect the semi-bent head.

[0035] As an optional embodiment, such as Figure 1 and Figure 8 As shown, two heat dissipation cavities 13 are also provided inside the mold base 1. The two heat dissipation cavities 13 are respectively located on both sides of the cavity 11 and close to the cavity 121. It should be noted that both ends of the heat dissipation cavities 13 are connected to the external environment, so that air flow can be used for heat dissipation, thereby cooling the mold base 1 and preventing the mold base 1 from thermal fatigue failure due to prolonged exposure to high temperature, which would affect its life and accuracy.

[0036] In addition, such as Figures 1-4 and Figure 7 As shown, the hot stamping forming apparatus also includes a water-cooling component 3. The water-cooling component 3 is mainly used to cool the sidewalls of the semi-bent head. The water-cooling component 3 includes two flow channels 31 and multiple water nozzles 32. The two flow channels 31 correspond one-to-one with the two heat dissipation chambers 13, and the flow channels 31 are located on the upper side of their respective heat dissipation chambers 13. Each flow channel 31 has an independent inlet 311 and an outlet 312 at its end.

[0037] Multiple water nozzles 32 are distributed on opposite side walls of cavity 122 and are spaced apart along the length of cavity 122. The two sides of water nozzles 32 are connected to cavity 122 and corresponding flow channel 31, respectively.

[0038] When in use, control the flow rate of the two water spray nozzles 32 on both sides so that the water flowing out can flow down along the inner wall of the cavity 121, thereby achieving cooling and heat dissipation of the outer wall of the semi-bent head.

[0039] As an optional embodiment, such as Figure 4 As shown, multiple water grooves 1211 are spaced apart along the circumference of the inner wall of the cavity 121, i.e., along its semi-circular outline. Each water groove 1211 is a long, narrow channel along the length of the cavity 121. The water grooves 1211 provide a guiding path for the cooling water, directing the water flow along the length of the cavity 121, preventing the water from flowing directly downwards, and increasing the contact area between the cooling water and the outer wall of the semi-bent head, thereby improving the heat dissipation speed of the semi-bent head.

[0040] Furthermore, multiple water channels 1212 are formed along the length of the inner wall of the cavity 121. The water channels 1212 are grooves extending circumferentially along the cavity 121. Water channels 1212 on the same side intersect and connect with all water channels 1211 on that side. This grid-like water channel system allows cooling water to be more evenly distributed across the entire curved inner wall of the cavity 121, establishing a continuous and stable water film layer or vapor-liquid two-phase flow layer, reducing cooling dead zones, and thus facilitating uniform and all-around cooling of the outer surface of the semi-bent head.

[0041] In addition, such as Figures 1-4 and Figure 6 As shown, the hot stamping forming apparatus also includes a water-cooling component 2 4. The water-cooling component 2 4 is mainly used to dissipate heat and cool the inner surface of the semi-bent head.

[0042] Specifically, the water-cooling component 2 4 includes two flow channels 3 41 and multiple water spray nozzles 3 42. The two flow channels 3 41 correspond one-to-one with the two heat dissipation cavities 13, and the flow channels 3 41 are located between the top of the corresponding flow channels 2 31 and the heat dissipation cavities 13. Water inlets 3 411 and water outlets 3 412 are respectively opened on both sides of the flow channels 3 41.

[0043] Multiple water nozzles 3 42 are distributed on the opposite side walls of the cavity 122 and are located above the water nozzle 2 32. The two sides of the water nozzles 3 42 are connected to the cavity 122 and the corresponding flow channel 3 41, respectively.

[0044] The spray angle of nozzle 3 42 is set to be horizontal or slightly tilted upwards. The purpose is that after the semi-bent head is formed in the cavity 121, water can be sprayed onto the inner surface of the semi-bent head through nozzle 3 42. In this way, through the coordinated operation of nozzle 1 23, nozzle 2 32 and nozzle 3 42, the heat dissipation inside and outside the semi-bent head can be more uniform.

[0045] As an optional embodiment, the distance between two adjacent water nozzles 32 gradually increases in the direction from the center of the cavity 122 towards both sides; at the same time, the distance between two adjacent water nozzles 42 also gradually increases. This gradient design can accelerate the cooling rate in the middle of the semi-bent head, thereby reducing the temperature difference between the middle position and the two sides, thus reducing product deformation and differences in microstructure properties caused by uneven cooling.

[0046] As an optional embodiment, the density of the water tanks 1212 gradually decreases from the center to both sides of the cavity 121. That is, the water tanks 1212 are denser in the middle of the cavity 121 and sparser at both ends. Therefore, the middle section of the cavity 121 has the strongest water retention, water distribution and flow guiding capabilities, and the largest heat exchange capacity, further improving the cooling speed at the middle position of the semi-bent head.

[0047] The invention also includes a control system, which is electrically connected to the drive unit 24, the stamping part and the external pump body.

[0048] A hot stamping forming process for elbows made of ultra-thick-walled super duplex steel plates. The detailed steps of this process are as follows: Step 1: After a steel plate made of high-temperature super dual-phase steel is stamped into a semi-bent shape in the mold base 1, the control system immediately starts a multi-channel cooling cycle, that is, controls water spraying from nozzle 1 23 to nozzle 3 42.

[0049] Specifically, it is necessary to control the water spray speed of the second water nozzle 32 so that it flows smoothly down the inner walls on both sides of the cavity 122 towards the top plate 21, which can cool the outer surface of the semi-bent head.

[0050] At the same time, control the water spraying speed of nozzle 3 42 so that the water sprayed from nozzle 3 42 can cover the inner surface of the semi-bent head.

[0051] In addition, the water nozzles 23 inside the top plate 21 spray powerfully onto the inner arc of the elbow from the bottom. The three water streams work together to achieve rapid and uniform cooling of the semi-elbow by surrounding it from the outside, top, and inside.

[0052] Step two: After the cooling process continues for a preset time, the surface of the semi-bent head rapidly cools and shrinks, significantly reducing the clamping force on the cavity 121. At this time, the control system sends a signal, and all the drive components 24 evenly distributed in the cavity 11 are simultaneously activated. The telescopic ends of the drive components 24 extend smoothly and synchronously upwards, pushing the ejector plate 21 upwards together. Since the top of the ejector plate 21 is an arc shape that fits against the inner arc surface of the bend, it provides a large-area, uniform upward lifting force. Therefore, the semi-bent head is smoothly and completely pushed upwards from the cavity 121, which facilitates the demolding operation of the semi-bent head.

[0053] The embodiments of this example have been described above. However, this example is not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of this example, and all of them are within the protection scope of this example.

Claims

1. A hot stamping forming device for elbows made of ultra-thick-walled super duplex steel plates, characterized in that, include The mold base (1) has a cavity (11) and a groove (12) inside. The groove (12) includes... The cavity (121) has a semi-circular cross-section and is adapted to the shape of the semi-bent head. The bottom of the cavity (121) has a through hole (123) communicating with the chamber (11) along the length of the cavity (121). The cavity (122) has a rectangular cross-section and its upper and lower sides are connected to the upper surface of the mold base (1) and the upper surface of the cavity (121), respectively. Cooling and demolding assembly (2), which includes The ejector plate (21) slides vertically within the through hole (123), and its length direction is set along the length direction of the through hole (123); The flow channel 1 (22) is located inside the top plate (21), and has an inlet 1 (221) and an outlet 1 (222) at its two ends respectively; Multiple water nozzles (23) are spaced apart on the top of the top plate (21) along the length of the top plate (21), and their bottoms are connected to the flow channel (22). Multiple drive units (24) are disposed in the chamber (11), and their telescopic ends are fixedly connected to the bottom of the ejector plate (21) for driving the ejector plate (21) to move in the vertical direction.

2. The hot stamping forming device for ultra-thick-walled super duplex steel plate elbows according to claim 1, characterized in that, In the direction from the center to both sides of the top plate (21), the distance between two adjacent water nozzles (23) gradually increases.

3. The hot stamping forming device for ultra-thick-walled super duplex steel plate elbows according to claim 1, characterized in that, The top of the ejector plate (21) is an arc-shaped structure with the opening facing upwards, and it is concentrically arranged with the cavity (121).

4. The hot stamping forming device for ultra-thick-walled super duplex steel plate elbows according to claim 1, characterized in that, The mold base (1) also has two heat dissipation cavities (13), which are respectively located on both sides of the cavity (11) and close to the cavity (121).

5. The hot stamping forming device for ultra-thick-walled super duplex steel plate elbows according to claim 4, characterized in that, The hot stamping forming apparatus further includes a water-cooling component (3), which includes Two flow channels (31) are provided, which correspond one-to-one with the two heat dissipation cavities (13). The flow channels (31) are located on the upper side of the corresponding heat dissipation cavity (13). The two sides of the flow channels (31) are respectively provided with inlet (311) and outlet (312). Multiple water nozzles (32) are distributed on opposite side walls of the cavity (122) and spaced apart along the length of the cavity (122). The two sides of each water nozzle (32) are connected to the cavity (122) and the corresponding flow channel (31), respectively.

6. The hot stamping forming device for ultra-thick-walled super duplex steel plate elbows according to claim 5, characterized in that, Multiple water tanks (1211) are spaced apart along the circumference of the inner wall of the cavity (121), and the length direction of the water tanks (1211) is arranged along the length direction of the cavity (121). Multiple water troughs (1212) are provided on the inner wall of the cavity (121) along its length direction. The length direction of the water troughs (1212) is arranged along the circumference of the cavity (121). The water troughs (1212) on the same side are connected to multiple water troughs (1211) on the same side.

7. The hot stamping forming device for ultra-thick-walled super duplex steel plate elbows according to claim 6, characterized in that, The hot stamping forming apparatus further includes a water-cooling component two (4), which includes Two flow channels (41) are provided, which correspond one-to-one with the two heat dissipation cavities (13). The flow channels (41) are located between the top of the corresponding flow channel (31) and the heat dissipation cavity (13). The flow channels (41) are provided with inlet (411) and outlet (412) on both sides respectively. Multiple water nozzles three (42) are distributed on opposite side walls of the cavity (122) and located above the water nozzle two (32). The two sides of the water nozzles three (42) are respectively connected to the cavity (122) and the corresponding flow channel three (41).

8. The hot stamping forming device for ultra-thick-walled super duplex steel plate elbows according to claim 7, characterized in that, In the cavity (122), the distance between two adjacent nozzles (32) gradually increases from the center to both sides; and In the cavity (122), the distance between two adjacent nozzles (42) gradually increases from the center to both sides.

9. The hot stamping forming device for ultra-thick-walled super duplex steel plate elbows according to claim 8, characterized in that, In the cavity (121) from the middle to both sides, the distance between two adjacent water tanks (1212) gradually increases.

10. A hot stamping forming process for elbows made of ultra-thick-walled super duplex steel plates, characterized in that, The hot stamping forming device for ultra-thick-walled super duplex steel plate elbows as described in claim 7 comprises the following steps: Step 1: After the elbow is stamped, water is simultaneously introduced through inlet 1 (221), inlet 2 (311) and inlet 3 (411). The water inlet speed of inlet 2 (311) and inlet 3 (411) is controlled so that the water sprayed from nozzle 2 (32) flows along the inner wall of cavity (122) to the top plate (21), and the water sprayed from nozzle 3 (42) covers the upper surface of the elbow. Step 2: Activate multiple drive components (24) to push the ejector plate (21) upward, thereby pushing the semi-bent head upward.

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