A metal bellows production forming device

Abstract

This invention relates to the field of casting and molding technology, specifically to a metal corrugated pipe production and molding device. It includes a base and a lower mold seat rotatably connected to the base. The lower mold seat is bent backward and has a seat lug. The seat lug is hinged to the base via a lower hydraulic cylinder. The lower mold seat can rotate around the base under the extension and retraction of the lower hydraulic cylinder. A top seat is fixedly connected to the upper part of the lower mold seat via a guide post. The guide post is slidably connected to an upper mold seat. The upper mold seat is connected to the top seat via an upper hydraulic cylinder. An upper mold fixedly connected to the lower surface of the upper mold seat and a lower mold fixedly connected to the upper surface of the lower mold seat close together to form a casting cavity. This invention uses a fixed box with an arc-shaped groove rotatably and sealed within the front of the casting cavity, allowing the molten aluminum at the lower position in the rotating box to enter the casting cavity first compared to the surface aluminum slag, thereby ensuring the molding quality of the metal corrugated pipe within the casting cavity.

Description

Technical Field

[0001] This invention relates to the field of casting and molding technology, specifically to a metal corrugated pipe production and molding apparatus. Background Technology

[0002] The existing processing of corrugated metal pipes is mainly divided into two categories. One is the sheet metal coil welding forming process, in which stainless steel strip is coiled inward to form a tubular blank, and the butt weld of the tube blank is welded to obtain a round tube base. Then, it is sent into a corrugated forming device to expand and form a corrugated structure. This process is suitable for the production of thin-walled metal corrugated pipes. However, for metal corrugated pipes with larger wall thickness, the coil welding process has shortcomings such as weld cracking, welding defects, and difficulty in ensuring wall thickness uniformity. Therefore, the industry also uses the casting method to prepare thick-walled metal corrugated pipe blanks, and then the finished corrugated pipes are obtained by internal hole turning.

[0003] Currently, the preparation of metal corrugated pipe blanks mostly adopts the tilting gravity casting process. Generally, a pouring cup or pouring basin is fixedly connected to the front end of the mold pouring port. Molten aluminum is pre-poured into the pouring cup, and the mold rotates as a whole, causing the pouring cup to rotate synchronously. Gravity allows the molten aluminum inside the pouring cup to gradually fill the mold casting cavity to complete the pouring. However, molten aluminum is chemically reactive. Even after slag removal in the smelting furnace, the molten aluminum will still come into contact with air over a large area during the transfer from the smelting furnace to the pouring cup, thus regenerating alumina slag. Meanwhile, while the molten aluminum is standing in the pouring cup waiting for the mold to flip, the surface of the molten aluminum will continuously contact the air in the open environment to grow a continuous oxide scale. Some fine suspended slag that was not completely removed during the smelting stage will also float to the surface. In the existing tilting casting structure, the pouring cup and the mold flip synchronously. During the flipping process, the molten aluminum carrying alumina slag on the inner surface of the pouring cup will flow into the casting cavity first. The oxide slag will remain inside the casting blank, causing casting defects such as slag inclusions and porosity, which will directly reduce the quality of the finished metal bellows product obtained in subsequent processing. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention proposes a metal corrugated pipe production and forming device. This invention uses a rotating box with an arc-shaped groove to be rotatably sealed inside a fixed box on the front side of the casting cavity. This allows the molten aluminum at the lower position inside the rotating box to enter the casting cavity first compared to the aluminum slag on the surface, thereby ensuring the forming quality of the metal corrugated pipe in the casting cavity.

[0005] The technical solution adopted by the present invention to solve its technical problem is as follows: A metal corrugated pipe production and forming device of the present invention includes a base and a lower mold base rotatably connected to the base; the lower mold base is bent backward and provided with a seat ear; the seat ear is hinged to the base by a lower hydraulic cylinder; the lower mold base can rotate around the base under the extension and retraction of the lower hydraulic cylinder; a top seat is fixedly connected to the upper part of the lower mold base by a guide column; the guide column is slidably connected to an upper mold base; the upper mold base is connected to the top seat by an upper hydraulic cylinder; an upper mold fixedly connected to the lower surface of the upper mold base and a lower mold fixedly connected to the upper surface of the lower mold base are closed to form a casting cavity; a fixed box is fixedly connected to the front side of the lower mold base by an oblique strip; the fixed box is semi-cylindrical in shape; the upper port of the fixed box is flush with the lower edge of the casting cavity; a rotating box of a corresponding shape is rotatably sealed to the inner side of the fixed box; the rotation point of the rotating box is rotatably connected to the rotation point of the fixed box by a rotating rod; an arc groove is provided along the circumference of the bottom wall of the rotating box.

[0006] Preferably, the rotating rod fixedly connected to the rotation point of the rotating box extends to the outside of the fixed box; a counterweight is fixedly connected to the outer wall of the rotating rod; the cross-section of the counterweight is adapted to the cross-section of the fixed box.

[0007] Preferably, the counterweight block has a counterweight hole that is movably fitted with the rotating rod; the inner and outer walls of the counterweight hole are penetrated and threadedly connected to the first bolt.

[0008] Preferably, the rotating box is fixedly connected to the rotating rod; the end of the rotating rod is fixedly connected to the output end of the heat-insulating motor; and the outer shell of the heat-insulating motor is fixedly connected to the lower mold base.

[0009] Preferably, the inner walls of the arc-shaped groove are provided with adjustment grooves; the adjustment grooves are connected to the arc-shaped outer wall of the rotating box; the inner wall of the arc-shaped groove is provided with a strip groove; the length direction of the strip groove is consistent with the left and right direction; a strip block is slidably connected in the strip groove; the cross-section of the strip groove and the strip block is an isosceles trapezoid; an arc-shaped adjustment plate is movably and sealingly connected in the adjustment groove; the adjustment plate is fixedly connected to the strip block; the adjustment plate is provided with a threaded stepped hole; the small-diameter end of the stepped hole is threadedly connected to a second bolt.

[0010] Preferably, the adjusting plate is composed of multiple adjusting blocks; two adjacent strip blocks are in movably sealed contact; each adjusting block is independently connected to a strip block and a second bolt.

[0011] Preferably, the guide plate is fixedly connected to the edge of the fixed box near the lower mold facing upwards; the guide plate is arc-shaped and can move in contact with the outer wall of the rotating box; the guide plate is provided with a V-shaped guide groove running through it from front to back.

[0012] Preferably, the fixed box, rotating box, and adjusting plate are all made of high-temperature resistant material, and the material is the same as that of the upper mold; the inner and outer walls of the rotating box and the inner wall of the fixed box are smoothly arranged.

[0013] Preferably, the upper mold is composed of an upper fixed mold, a first sliding mold, and a second sliding mold; the upper mold has an inverted L-shaped cross-section; the first sliding mold and the second sliding mold are slidably and sealingly connected to the lower inner side of the upper fixed mold along the left-right direction; an upper micro push rod is fixedly connected to the first sliding mold and the second sliding mold on opposite sides; the outer shell of the upper micro push rod is fixedly connected to the left and right outer walls of the upper fixed mold; the first sliding mold is located to the left of the second sliding mold; an upper mold cavity is provided on the lower surface of the upper mold; the left part of the upper mold cavity is located on the right side of the lower surface of the first sliding mold, and the right part of the upper mold cavity is located on the left side of the lower surface of the second sliding mold.

[0014] Preferably, the lower mold is composed of a lower fixed mold, a third sliding mold, and a fourth sliding mold; the lower mold has an L-shaped cross-section; the third and fourth sliding molds are slidably and sealingly connected to the upper inner side of the lower fixed mold along the left-right direction; a lower micro push rod is fixedly connected to the third and fourth sliding molds on opposite sides; the lower micro push rod housing is fixedly connected to the left and right outer walls of the lower fixed mold; the third sliding mold is located to the left of the fourth sliding mold; a lower mold cavity is provided on the upper surface of the lower mold; the left part of the lower mold cavity is located on the right side of the upper surface of the third sliding mold, and the right part of the lower mold cavity is located on the left side of the upper surface of the fourth sliding mold.

[0015] The beneficial effects of this invention are as follows: 1. The present invention uses a rotating box with an arc groove to rotate and seal the fixed box at the front of the casting cavity, so that the molten aluminum at the lower position in the rotating box enters the casting cavity first compared with the aluminum slag on the surface, thereby ensuring the forming quality of the metal bellows in the casting cavity.

[0016] 2. This invention uses multiple sets of independent adjusting blocks, strip blocks, and strip grooves in conjunction with the second bolt to lock the flow width of the arc groove in segments and precisely control the flow rate of the aluminum liquid casting, thereby achieving differentiated and stable filling, effectively venting and removing impurities, and significantly improving the forming quality of the corrugated pipe.

[0017] 3. The present invention uses an upper fixed mold, a first sliding mold, a second sliding mold and an upper micro push rod to cooperate, thereby opening and closing to form an upper groove to assist in venting, thereby avoiding the generation of porosity defects caused by residual gas in the casting cavity, and effectively improving the casting quality of corrugated pipes. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a perspective view of the present invention; Figure 2 yes Figure 1 A sectional view; Figure 3 This is a diagram showing the position of the counterweight in this invention; Figure 4 This is a diagram showing the location of the heat-insulating motor in this invention; Figure 5 This is a diagram showing the positions of the adjusting groove and the adjusting block in this invention; Figure 6 yes Figure 5 Enlarged view of point A in the middle; Figure 7 This is a structural diagram of the upper and lower molds in this invention; Figure 8 This is a structural diagram of a metal bellows.

[0020] In the diagram: Base 1, Lower mold base 11, Seat ear 12, Lower hydraulic cylinder 13, Guide column 14, Top seat 15, Upper mold base 16, Upper hydraulic cylinder 17, Upper mold 2, Upper fixed mold 21, First sliding mold 22, Second sliding mold 23, Upper micro push rod 24, Upper mold cavity 25, Lower mold 3, Casting cavity 31, Lower fixed mold 32, Third sliding mold 33, Fourth sliding mold 34, Lower micro push rod 35, Lower mold cavity 36, Fixed box 4, Inclined bar 41, Rotating box 5, Rotating rod 51, Arc groove 52, Counterweight block 53, Counterweight hole 54, First bolt 55, Thermal insulation motor 56, Adjustment groove 57, Strip groove 58, Adjustment plate 6, Strip block 61, Step hole 62, Second bolt 63, Adjustment block 64, Guide plate 7, Guide groove 71. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] like Figures 1 to 8 As shown, the present invention includes the following embodiments: Example 1: A metal corrugated pipe production and forming device includes a base 1 and a lower mold base 11 rotatably connected to the base 1; the lower mold base 11 is bent downwards and rearwards with a seat ear 12; the seat ear 12 is hinged to the base 1 via a lower hydraulic cylinder 13; the lower mold base 11 can rotate around the base 1 under the extension and retraction of the lower hydraulic cylinder 13; a top seat 15 is fixedly connected to the upper part of the lower mold base 11 via a guide post 14; the guide post 14 is slidably connected to an upper mold base 16; the upper mold base 16 is connected to the top seat 15 via an upper hydraulic cylinder 17; the upper... The upper mold 2, which is fixedly connected to the lower surface of the mold base 16, and the lower mold 3, which is fixedly connected to the upper surface of the lower mold base 11, are closed to form a casting cavity 31. A fixed box 4 is fixedly connected to the front side of the lower mold base 11 by an inclined strip 41. The fixed box 4 is semi-cylindrical in shape. The upper end of the fixed box 4 is flush with the lower edge of the casting cavity 31. A rotating box 5 with a corresponding shape is rotatably sealed to the inside of the fixed box 4. The rotation point of the rotating box 5 is rotatably connected to the rotation point of the fixed box 4 by a rotating rod 51. An arc groove 52 is provided along the circumference of the bottom wall of the rotating box 5.

[0023] Initially, the casting cavity 31 is horizontally facing forward, the fixed box 4 is vertically facing upward, and the rotating box 5 inside the fixed box 4 is also vertically facing upward. The rotating box 5 is located inside the fixed box 4. Then, the upper hydraulic cylinder 17 is extended, causing the upper mold base 16 to move downward. During this downward movement, the upper mold 2 is also moved downward. The upper mold cavity 25 on the lower surface of the upper mold 2 corresponds to the lower mold cavity 36 on the upper surface of the lower mold 3, forming the casting cavity 31 after mold closing. Workers use a transfer container to pour molten aluminum into the rotating box 5. (Even when slag is skimmed from the smelting furnace, only the slag already formed in the furnace can be removed; the molten aluminum poured into the rotating box 5...) Afterwards, new oxide slag will be generated, which is the root cause of the floating slag on the rotating box 5. During the process of pouring molten aluminum into the rotating box 5, the molten aluminum will come into contact with a large area of ​​air during the flow, generating aluminum slag. The aluminum slag entering the casting cavity 31 will affect the quality of the formed metal bellows. The rotating box 5 is an open container. During the process of waiting for the lower mold 3 to flip in the rotating box 5, the liquid surface is in continuous contact with air, and continuous oxide scale will grow on the surface. The aluminum slag will float on the surface of the molten aluminum inside the rotating box 5. Then, the lower mold base 11 is controlled to flip backward. There are various ways to flip. The rotating shaft of the lower mold base 11 can be directly controlled by the motor to achieve the flipping. Alternatively, the flipping method of this invention can be adopted, that is, controlling the lower hydraulic cylinder 13 to shorten, the lower hydraulic cylinder 13 will pull the seat ear 12 to flip forward, so that the lower mold base 11 flips backward around the rotation point. Then, during the backward flipping of the lower mold base 11, it will drive the lower mold 3, upper mold 2, guide post 14, upper mold base 16 and top seat 15 to flip backward synchronously. During the backward flipping of the lower mold base 11, it will drive the inclined bar 41 and the fixed box 4 to flip backward, so that the opening of the fixed box 4 is tilted backward. The fixed box 4 is rotatably sealed and connected to the rotating box 5. The overall center of gravity of the rotating box 5 is lower, so that the opening of the rotating box 5 is always facing upward. In this way, the rotating box 5 and the fixed box 4 will generate a phase. As the mold rotates, the molten aluminum moving away from the lower mold 3 will enter the fixed box 4 from the rotating box 5. However, the height of the fixed box 4 away from the lower mold 3 will increase, and the rotating box 5 and the fixed box 4 are connected in a rotating seal, so the molten aluminum will not overflow. The rotating seal between the rotating box 5 and the fixed box 4 is not an absolute seal, but a relative seal, achieving a state similar to the tight fit between the upper mold 2 and the lower mold 3, thus preventing leakage. As the lower mold base 11 and the fixed box 4 continue to rotate backward, the arc groove 52 on the inner side of the rotating box 5 will gradually be exposed from the edge of the fixed box 4 near the lower mold 3, so that the molten aluminum in the rotating box 5 will gradually flow into the aligned casting cavity 31 along the arc groove 52. In the tilted casting state, molten aluminum can flow downwards along the inner wall of the casting cavity 31, allowing gas in the casting cavity 31 to be discharged as much as possible, improving the subsequent metal bellows forming quality. As the fixed box 4 rotates with the lower mold base 11, the molten aluminum in the rotating box 5 gradually enters the casting cavity 31, filling it with molten aluminum. Then, with the opening of the casting cavity 31 facing upwards, cooling is performed. Cooling channels can be provided inside the casting cavity 31 for cooling (this is existing technology and will not be elaborated further), or natural cooling can be used. The molten aluminum in the casting cavity 31 cools down. After post-curing, the cured semi-finished product has the same shape as the metal corrugated pipe. Then, the lower hydraulic cylinder 13 is extended, thereby pushing the seat ear 12 to move backward, so that the lower mold base 11 flips forward and resets until the opening of the fixed box 4 is vertically facing upward again. The upper hydraulic cylinder 17 shortens and drives the upper mold base 16 to slide upward along the guide post 14. The upper mold base 16 will drive the upper mold 2 to move upward, realizing the mold opening. Then, the semi-finished product can be taken out from the lower mold cavity 36 on the upper surface of the lower mold 3. Then, the semi-finished product is machined into a metal corrugated pipe by turning the inner hole. The rotating box 5 is controlled to rotate, and the aluminum slag inside the rotating box 5 and the fixed box 4 is cleaned for the next casting.

[0024] The present invention connects a rotating box 5 with an arc groove 52 to a fixed box 4 on the front side of the casting cavity 31, thereby allowing the molten aluminum in the lower part of the rotating box 5 to enter the casting cavity 31 first compared with the aluminum slag on the surface, thus ensuring the forming quality of the metal bellows in the casting cavity 31.

[0025] Example 2: The rotating rod 51, which is fixedly connected to the rotation point of the rotating box 5, extends to the outside of the fixed box 4; a counterweight 53 is fixedly connected to the outer wall of the rotating rod 51; the cross section of the counterweight 53 is adapted to the cross section of the fixed box 4.

[0026] In this embodiment, the counterweight block 53 is provided with a counterweight hole 54 that is movably engaged with the rotating rod 51; the inner and outer walls of the counterweight hole 54 are penetrated and threadedly connected to the first bolt 55.

[0027] After the mold is closed and molten aluminum is poured into the rotating box 5, the lower mold base 11 drives the fixed box 4 to tilt backward synchronously for tilting casting. During the operation, aluminum slag easily adheres to the inner wall of the rotating box 5, and the flow of molten aluminum generates frictional resistance. Relying on the eccentric self-weight of the counterweight 53, a stable rotational torque is continuously provided to the rotating box 5 (the rotating rod 51 is fixedly connected to the rotating box 5), effectively overcoming the resistance generated by aluminum slag adhesion and molten aluminum friction. This ensures that the rotating box 5 always maintains an upward-facing opening during the tilting and angle change of the fixed box 4, guaranteeing the stability of slag-separated casting. Before installing the counterweight 53, the circumferential installation angle of the counterweight 53 can be adjusted by loosening the first bolt 55. After adjustment, the first bolt 55 is tightened to lock and position it. The initial angle of the rotating box 5 can be flexibly adjusted under actual production conditions. For conditions with low aluminum slag content and general product quality requirements, the angle can be adjusted to expose the arc groove 52 in advance, shortening the aluminum liquid casting process and achieving rapid filling. For slag-free and low-precision production scenarios, the angle of the counterweight 53 can be adjusted again to change the tilt state of the rotating box 5, allowing the aluminum liquid to directly pass over the rotating box 5 to complete a straight-through casting (for example, controlling the arc groove 52 to be exposed directly from the edge of the fixed box 4 near the lower mold 3 in a vertical state), meeting different production needs. In this embodiment, the counterweight 53 cooperates with the adjustable locking structure to overcome the resistance during the casting process and stabilize the posture of the rotating box 5. At the same time, it can flexibly adapt to different slag conditions and casting modes, achieving the effect of adapting to multiple production scenarios and improving the versatility of the equipment.

[0028] Example 3: The rotating box 5 is fixedly connected to the rotating rod 51; the end of the rotating rod 51 is fixedly connected to the output end of the heat-insulating motor 56; the outer shell of the heat-insulating motor 56 is fixedly connected to the lower mold base 11.

[0029] As the fixed box 4 flips backward with the lower mold base 11, the heat-insulating motor 56 (i.e., a common motor with a heat-insulating shell on its surface) drives the rotating rod 51 to rotate. The rotation of the rotating rod 51 drives the rotating box 5 to rotate, thus causing the rotating box 5 and the fixed box 4 to rotate. This ensures that the opening of the rotating box 5 always faces vertically upward. As the rotation angle between the rotating box 5 and the fixed box 4 increases, the arc-shaped groove 52 will gradually emerge from the fixed box 4 toward the edge of the lower mold 3, thus allowing for casting.

[0030] Example 4: The inner walls of the arc-shaped groove 52 are provided with adjustment grooves 57; the adjustment grooves 57 are connected to the arc-shaped outer wall of the rotating box 5; the inner wall of the arc-shaped groove 57 is provided with a strip groove 58; the length direction of the strip groove 58 is consistent with the left and right direction; a strip block 61 is slidably connected in the strip groove 58; the cross-section of the strip groove 58 and the strip block 61 is an isosceles trapezoid; an arc-shaped adjustment plate 6 is movably and sealed in the adjustment groove 57; the adjustment plate 6 is fixedly connected to the strip block 61; the adjustment plate 6 is provided with a threaded stepped hole 62; the small diameter end of the stepped hole 62 is threadedly connected to a second bolt 63.

[0031] In this embodiment, the adjusting plate 6 is composed of multiple adjusting blocks 64; two adjacent strip blocks 61 are in movably sealed contact (only relatively sealed, not absolutely sealed, just enough to prevent leakage); each adjusting block 64 is independently connected to the strip block 61 and the second bolt 63.

[0032] Before the casting operation, the rotating box 5 can be rotated to detach it from the fixed box 4, completely exposing the stepped hole 62 on the arc groove 52. Then, the second bolt 63 is loosened to release the compression and locking state of the second bolt 63 on the inner wall of the adjusting groove 57, so that the adjusting plate 6 is in the unlocked state. According to the flow rate requirements of the corrugated pipe casting, the operator can push the adjusting plate 6 to drive the strip block 61 to slide smoothly left and right along the strip groove 58 of the isosceles trapezoidal structure. The guiding cooperation between the strip groove 58 and the strip block 61 ensures the smooth adjustment process, thereby changing the width of the arc groove 52 and also changing the flow position of the arc groove 52 in the left and right directions (for example, the left adjusting plate 6 retracts and the right adjusting plate 6 extends, so that the arc groove 52 flows out to the left, and vice versa, thus adapting to the position of the casting cavity 31).

[0033] Furthermore, the regulating plate 6, composed of multiple sets of independent regulating blocks 64, can individually adjust the shielding area of ​​each region of the arc groove 52, and can specifically change the flow width at different positions of the arc groove 52. This allows for flexible control of the casting flow rate of the aluminum liquid at the initial, middle, and final stages, achieving differentiated casting effects such as slow filling and venting in the early stage, uniform and stable casting in the middle stage, and slow finishing in the later stage (or other casting requirements can be used for adjustment). After adjusting the flow rate and flow area, the second bolt 63 is tightened to press against the inner wall of the regulating groove 57, locking and fixing each independent regulating block 64, locking the position of the regulating plate 6, and ensuring that the flow dimension of the arc groove 52 remains stable during the casting process. In this embodiment, the combination of multiple sets of independent regulating blocks 64, strip blocks 61, strip grooves 58, and the locking of the second bolt 63 allows for segmented adjustment of the flow width of the arc groove 52 and precise control of the aluminum liquid casting flow rate, thereby achieving differentiated and stable filling, effectively venting and removing impurities, and significantly improving the forming quality of the corrugated pipe.

[0034] Example 5: The fixed box 4 is fixedly connected to the guide plate 7 on the upward-facing edge near the lower mold 3; the side of the guide plate 7 near the rotating box 5 is arc-shaped and can move in contact with the outer wall of the rotating box 5; the guide plate 7 is provided with a V-shaped guide groove 71 running through it from front to back; during the process of the fixed box 4 flipping backward with the lower mold base 11, the rotating box 5 will move relative to the inside of the fixed box 4, and the rotating box 5 will contact the side of the guide plate 7 away from the lower mold 3. After the arc-shaped groove 52 is exposed from the side of the fixed box 4 near the lower mold 3, the molten aluminum enters the casting cavity 31 along the arc-shaped groove 52 and under the guidance of the guide groove 71 of the guide plate 7.

[0035] Example 6: The fixed box 4, the rotating box 5 and the adjusting plate 6 are all made of high temperature resistant material, and the material is the same as that of the upper mold 2; the inner and outer walls of the rotating box 5 and the inner wall of the fixed box 4 are smooth.

[0036] Example 7: The upper mold 2 is composed of an upper fixed mold 21, a first sliding mold 22, and a second sliding mold 23; the upper mold 2 has an inverted L-shaped cross section; the lower inner side of the upper fixed mold 21 is slidably and sealingly connected to the first sliding mold 22 and the second sliding mold 23 along the left and right directions; the output end of the upper micro push rod 24 is fixedly connected to the side of the first sliding mold 22 and the second sliding mold 23 away from each other; the outer shell of the upper micro push rod 24 is fixedly connected to the left and right outer walls of the upper fixed mold 21; the first sliding mold 22 is located to the left of the second sliding mold 23; an upper mold cavity 25 is provided on the lower surface of the upper mold 2; the left part of the upper mold cavity 25 is located on the right side of the lower surface of the first sliding mold 22, and the right part of the upper mold cavity 25 is located on the left side of the lower surface of the second sliding mold 23.

[0037] In this embodiment, the lower mold 3 is composed of a lower fixed mold 32, a third sliding mold 33, and a fourth sliding mold 34; the lower mold 3 has an L-shaped cross-section; the third sliding mold 33 and the fourth sliding mold 34 are slidably and sealingly connected to the inner side of the lower fixed mold 32 along the left and right directions; the output end of the lower micro push rod 35 is fixedly connected to the side of the third sliding mold 33 and the fourth sliding mold 34 away from each other; the outer shell of the lower micro push rod 35 is fixedly connected to the left and right outer walls of the lower fixed mold 32; the third sliding mold 33 is located to the left of the fourth sliding mold 34; a lower mold cavity 36 is provided on the upper surface of the lower mold 3; the left part of the lower mold cavity 36 is located on the right side of the upper surface of the third sliding mold 33, and the right part of the lower mold cavity 36 is located on the left side of the upper surface of the fourth sliding mold 34.

[0038] Before the upper mold 2 approaches the lower mold 3, the upper micro push rod 24 is shortened. The upper micro push rod 24 and the lower micro push rod 35 can be telescopic elements such as electric push rods or hydraulic cylinders. During the shortening process of the upper micro push rods 24 on both sides, the first sliding mold 22 and the second sliding mold 23 will move away from each other. The rear side of the first sliding mold 22 and the second sliding mold 23 can be provided with an upper auxiliary strip that is slidably and sealed to the upper auxiliary groove at the rear of the inner side of the upper fixed mold 21 (the rear side of the first sliding mold 22 and the second sliding mold 23 are fixedly connected to the corresponding upper auxiliary strip, so that the sliding is more stable). The cross-section of the upper auxiliary strip and the upper auxiliary groove is an isosceles trapezoid. The first sliding mold 22 and the second sliding mold After separation, 23 forms an upper groove with the inner wall of the lower surface of the upper fixed mold 21; in addition, the lower micro push rod 35 is shortened. During the shortening process of the lower micro push rod 35 on the left and right sides, the third sliding mold 33 and the fourth sliding mold 34 will move away from each other. The rear side of the third sliding mold 33 and the fourth sliding mold 34 can be provided with a lower auxiliary strip and a lower auxiliary groove at the rear position of the inner side of the lower fixed mold 32 for sliding and sealing connection (the rear side of the third sliding mold 33 and the fourth sliding mold 34 are fixedly connected with the corresponding lower auxiliary strip, so that the left and right sliding is more stable). The cross section of the lower auxiliary strip and the lower auxiliary groove is an isosceles trapezoid. After the third sliding mold 33 and the fourth sliding mold 34 are separated, they form a lower groove with the inner wall of the upper surface of the lower fixed mold 32.

[0039] The upper and lower grooves reach the bottom of the casting cavity 31. Then, the upper mold 2 and lower mold 3 are brought into contact to complete mold closing. Next, the lower mold base 11 is flipped backward, and molten aluminum is poured from the exposed arc-shaped groove 52 of the rotating box 5 into the casting cavity 31. Due to gravity, the molten aluminum flows directly along the lower groove to the deepest part of the casting cavity 31. The lower groove is relatively smooth, and the molten aluminum does not linger. Compared to the previously unseparated lower mold cavity 36, the molten aluminum is more easily... Instead of remaining on the lower corrugated inner wall of the casting cavity 31, this embodiment directly utilizes the lower groove, allowing the molten aluminum to be guided directly to the deepest part of the casting cavity 31. This enables sequential casting from the inside out of the casting cavity 31, resulting in higher product quality after casting. As the amount of molten aluminum in the casting cavity 31 increases, the gas in the casting cavity 31 will be smoothly discharged along the upper groove. Compared to the original one-piece upper mold cavity 25, gas is more likely to remain on the uneven upper corrugated inner wall of the upper mold cavity 25, causing incomplete gas discharge. The previous method resulted in defects such as porosity in the molded product, but this embodiment solves this problem. After the molten aluminum in the casting cavity 31 is poured, the upper micro push rod 24 and the lower micro push rod 35 are controlled to extend rapidly, causing the first sliding mold 22 and the second sliding mold 23 to move closer to each other quickly. The upper groove will gradually disappear, and the molten aluminum in the upper groove will be pressurized into the casting cavity 31. The third sliding mold 33 and the fourth sliding mold 34 move closer to each other quickly, and the lower groove will gradually disappear. The molten aluminum in the lower groove will be pressurized into the casting cavity 31. Then, wait for cooling and solidification. After solidification, control the upper mold 2 to move away from the lower mold 3, and then control the first sliding mold 22 and the second sliding mold 23 to move away from each other, and the third sliding mold 33 and the fourth sliding mold 34 to move away from each other. Demolding is more thorough, and the aluminum burrs and flashes remaining in the upper and lower grooves will be removed with the product (metal corrugated pipe semi-finished product). The upper groove, the lower groove, and the casting cavity 31 need to be cleaned before the next pouring. This process is repeated.

[0040] This invention utilizes an upper fixed mold 21, a first sliding mold 22, a second sliding mold 23, and an upper micro push rod 24 to form an upper groove that can be opened and closed to assist in venting, thereby avoiding porosity defects caused by residual gas in the casting cavity 31 and effectively improving the casting quality of the corrugated pipe. Furthermore, this invention utilizes a lower fixed mold 32, a third sliding mold 33, a fourth sliding mold 34, and a lower micro push rod 35 to form a lower groove that directly guides the molten aluminum to the bottom of the cavity, achieving orderly filling from the inside out. This prevents the molten aluminum from prematurely remaining on the inner wall of the corrugated pipe near the opening of the casting cavity 31, where it comes into contact with a large amount of air and rapidly oxidizes, resulting in oxidation inclusions. This significantly reduces oxidation defects in the casting and improves the integrated molding quality of the corrugated pipe.

[0041] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description, and are not intended to 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 limiting the scope of protection of the present invention. In addition, the terms "first," "second," "third," etc. are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of the present invention, a fixed connection refers to a fixed connection. In the description of the present invention, a sliding connection refers to a connection where the two parts can only slide and cannot be separated. Specifically, the groove can be set to be concave and the block can be set to be convex, and the specific design can be adjusted according to the actual situation. A sliding fit refers to a connection where the two parts can slide and separate. In the description of the present invention, a rotating connection refers to a connection where the two parts can only rotate and cannot produce axial displacement. Specifically, an annular groove can be provided on the inner wall of the hole, and a ring that is rotatably connected to the groove can be fixedly connected to the outer wall of the shaft.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A metal corrugated pipe production and forming apparatus, comprising a base and a lower mold base rotatably connected to the base; the lower mold base is bent backward and provided with a seat ear; the seat ear is hinged to the base via a lower hydraulic cylinder; the lower mold base is capable of rotating around the base under the extension and retraction of the lower hydraulic cylinder; a top seat is fixedly connected to the upper part of the lower mold base via a guide post; the guide post is slidably connected to an upper mold base; the upper mold base is connected to the top seat via an upper hydraulic cylinder; an upper mold fixedly connected to the lower surface of the upper mold base and a lower mold fixedly connected to the upper surface of the lower mold base are closed to form a casting cavity; characterized in that: The front side of the lower mold base is fixedly connected to a fixed box by an oblique strip; the fixed box is semi-cylindrical in shape; the upper end of the fixed box is flush with the lower edge of the casting cavity; the inner side of the fixed box is rotatably sealed to a rotating box of a corresponding shape; the rotation point of the rotating box is rotatably connected to the rotation point of the fixed box by a rotating rod; the bottom wall of the rotating box is provided with an arc-shaped groove along the circumference.

2. The metal corrugated pipe production and forming apparatus according to claim 1, characterized in that: The rotating rod, which is fixedly connected to the rotation point of the rotating box, extends to the outside of the fixed box; a counterweight is fixedly connected to the outer wall of the rotating rod; the cross-section of the counterweight is adapted to the cross-section of the fixed box.

3. The metal corrugated pipe production and forming apparatus according to claim 2, characterized in that: The counterweight block has a counterweight hole that is movably fitted with the rotating rod; the inner and outer walls of the counterweight hole are penetrated and threadedly connected to the first bolt.

4. The metal corrugated pipe production and forming apparatus according to claim 1, characterized in that: The rotating box is fixedly connected to the rotating rod; the end of the rotating rod is fixedly connected to the output end of the heat-insulating motor; the outer shell of the heat-insulating motor is fixedly connected to the lower mold base.

5. The metal corrugated pipe production and forming apparatus according to claim 1, characterized in that: The inner walls of the arc-shaped groove are provided with adjustment grooves; the adjustment grooves are connected to the arc-shaped outer wall of the rotating box; the inner wall of the arc-shaped groove is provided with a strip groove; the length direction of the strip groove is consistent with the left and right direction; a strip block is slidably connected in the strip groove; the cross-section of the strip groove and the strip block is an isosceles trapezoid; an arc-shaped adjustment plate is movably and sealingly connected in the adjustment groove; the adjustment plate is fixedly connected to the strip block; the adjustment plate is provided with a threaded stepped hole; the small diameter end of the stepped hole is threadedly connected to a second bolt.

6. The metal corrugated pipe production and forming apparatus according to claim 5, characterized in that: The adjusting plate is composed of multiple adjusting blocks; two adjacent strip blocks are in movable sealing contact; each adjusting block is independently connected to a strip block and a second bolt.

7. The metal corrugated pipe production and forming apparatus according to claim 1, characterized in that: The guide plate is fixedly connected to the edge of the fixed box near the lower mold, facing upwards; the guide plate is arc-shaped and can move in contact with the outer wall of the rotating box; the guide plate is provided with V-shaped guide grooves running through it.

8. The metal corrugated pipe production and forming apparatus according to claim 5, characterized in that: The fixed box, rotating box, and adjusting plate are all made of high-temperature resistant material, and the material is the same as that of the upper mold; the inner and outer walls of the rotating box and the inner wall of the fixed box are smooth.

9. The metal corrugated pipe production and forming apparatus according to claim 1, characterized in that: The upper mold is composed of an upper fixed mold, a first sliding mold, and a second sliding mold; the upper mold has an inverted L-shaped cross-section; the first and second sliding molds are slidably and sealingly connected to the lower inner side of the upper fixed mold along the left and right directions; the first and second sliding molds are fixedly connected to an upper micro push rod on opposite sides; the outer shell of the upper micro push rod is fixedly connected to the left and right outer walls of the upper fixed mold; the first sliding mold is located to the left of the second sliding mold; The upper mold has an upper cavity on its lower surface; the left part of the upper cavity is located on the right side of the lower surface of the first sliding mold, and the right part of the upper cavity is located on the left side of the lower surface of the second sliding mold.

10. A metal corrugated pipe production and forming apparatus according to claim 9, characterized in that: The lower mold is composed of a lower fixed mold, a third sliding mold, and a fourth sliding mold; the lower mold has an L-shaped cross-section; the third and fourth sliding molds are slidably and sealingly connected to the inner side of the upper part of the lower fixed mold along the left and right direction; a lower micro push rod is fixedly connected to the third and fourth sliding molds on opposite sides; the outer shell of the lower micro push rod is fixedly connected to the left and right outer walls of the lower fixed mold; the third sliding mold is located to the left of the fourth sliding mold; a lower mold cavity is provided on the upper surface of the lower mold; the left part of the lower mold cavity is located on the right side of the upper surface of the third sliding mold, and the right part of the lower mold cavity is located on the left side of the upper surface of the fourth sliding mold.

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