An aluminum pipe end forming device

Abstract

An aluminum pipe end forming device, comprising a base, one end of the base is provided with an outer forming unit, the other end of the base is provided with an inner forming unit, the outer forming unit plays a guiding role for the movement of the pipe, and in the process of forming, the outer side and the inner side of the pipe are supported to avoid deformation due to the pushing effect. The inner forming unit and the outer forming unit cooperate to form the pipe, and the inner forming unit is moved and rotated by a short distance, so that the demolding operation is facilitated, the demolding difficulty is reduced, and the cost of the equipment is also reduced.

Description

An aluminum tube end forming device Technical Field

[0001] This invention relates to the field of aluminum tube processing technology, and in particular to an aluminum tube end forming device. Background Technology

[0002] Figure 18 shows the structure of a processed aluminum tube used in automotive parts such as shock absorbers. It includes a tube body 4, with a tapered tube 40 formed at one end and an end tube 41 formed at the other end of the tapered tube 40. The diameter of the end tube 41 is larger than that of the tube body 4. This structure typically uses extrusion molding. During processing, the tube body's expansion section is first heated, then quickly transferred to a forming device for expansion molding. After molding, the tube is removed. However, current expansion devices have the problem of inconvenient tube removal. During removal, one end of the tube is blocked by the inner mold, and the other end cannot move due to the tapered tube 40, thus affecting removal. The current method involves moving the inner mold back a sufficient distance to eject the tube, but this requires a hydraulic cylinder with a long range of motion, increasing equipment costs. Furthermore, the long movement distance reduces the axial alignment of the inner and outer molds, requiring frequent calibration. Secondly, during the forming process, since the force is applied only to the end of the aluminum tube, the tube 4 is easily deformed during the forming process, which increases the difficulty of straightening or reprocessing after processing. Summary of the Invention

[0003] This invention provides an aluminum tube end forming device to overcome the shortcomings of the prior art. During the forming process, the device supports the inside of the tube to prevent deformation and facilitates the removal of the inner mold, thus making demolding easier. It has strong practicality.

[0004] In order to achieve the objectives of this invention, the following technologies are proposed:

[0005] An aluminum tube end forming device includes a base, with an outer forming unit mounted at one end and an inner forming unit mounted at the other end. The outer forming unit guides the movement of the tube and, during the forming process, supports the outer and inner sides of the tube to prevent deformation due to pushing action. The inner and outer forming units work together to form the tube. The inner forming unit facilitates demolding through short-distance movement and rotation, reducing demolding difficulty and lowering equipment costs.

[0006] The base includes a base plate, on which a pair of support plates are mounted, and an upper plate is provided at the upper end of the support plates.

[0007] The outer forming unit includes a mounting base installed at one end of the upper plate, on which a first hydraulic cylinder is mounted. The first hydraulic cylinder has a movable end-push mechanism. A constraint platform is mounted on the upper plate, and constraint holes are formed along its length. The end-push mechanism passes through the constraint holes. An outer mold is mounted at the other end of the constraint platform. In this technical solution, the constraint holes constrain the outer periphery of the pipe fitting, preventing deformation of the pipe body during pushing. The end-push mechanism not only moves the pipe fitting to form its ends but also supports the interior of the pipe fitting, preventing deformation of the pipe body ends.

[0008] The inner forming unit includes a movable mechanism mounted on the machine base. The movable mechanism is equipped with an inner mold, which is used for forming the internal structure of the pipe end. The movable mechanism can drive the inner mold to move, thereby facilitating the demolding operation of the inner mold.

[0009] Furthermore, the end-pushing mechanism includes a concave mounting bracket installed on the movable end of the first hydraulic cylinder. An end-pushing plate is mounted on the concave mounting bracket. The diameter of the end-pushing plate is smaller than the diameter of the constraint hole. Three guide holes are arranged in a circumferential array on the end-pushing plate. A limit pin passes through the guide hole. An inner top arc plate is provided on the inner side of the limit pin. An inner convex plate is provided on the inner wall of the inner top arc plate. Multiple pairs of connecting plates are hinged to the inner convex plate. An outer convex plate is hinged to the other end of the connecting plate. A central column is provided in the outer convex plate. A connecting screw is provided on the outer side of the central column. The end of the connecting screw is installed on the end-pushing plate. A movable threaded sleeve is screwed onto the connecting screw. A collar is rotatably provided on the movable threaded sleeve. Three convex plates are provided on the outer shaft of the collar. A pair of end connecting plates are hinged to the outer side of each convex plate. The outer side of the end connecting plate is hinged to the inner convex plate. There is an included angle between the end connecting plate and the connecting plate. During the forming process, the movement of the moving threaded sleeve changes the angle between the end connecting plate and the convex plate, and causes the inner top arc plate to move outward, thereby achieving the effect of internal support for the pipe fitting. This internal support ensures that the supporting force generated by each inner top arc plate is equal and uniform, thus preventing deformation of the pipe fitting during the forming process. The end pusher acts on the end of the pipe fitting, pushing it forward under the drive of the first hydraulic cylinder, ultimately achieving the deformation of the pipe fitting end.

[0010] Furthermore, the end of the inner top arc plate is provided with an end protrusion. The end protrusion acts on the end of the pipe fitting, thereby pushing the pipe fitting forward.

[0011] Furthermore, a sleeve is fitted onto the connecting screw. The inner end of the sleeve has a hexagonal groove, and the outer end of the sleeve has a deflection plate. The outer end of the deflection plate has a gripping rod, and the end push plate has an arc-shaped hole through which the gripping rod passes. This sleeve allows for easy fitting onto the end of the movable screw sleeve, facilitating its rotation. This design avoids the difficulty of rotation caused by the movable screw sleeve being located inside the pipe fitting.

[0012] Furthermore, the outer mold includes a mounting plate installed at the end of the constraint platform. The mounting plate has an outer forming post, and a first forming hole is formed at the base of the outer forming post, penetrating the mounting plate. A second forming hole is formed at the other end of the first forming hole, and a tapered hole is formed at the other end of the second forming hole. A third forming hole is formed at the other end of the tapered hole. The diameter of the third forming hole is larger than the diameter of the second forming hole, which is larger than the diameter of the first forming hole. The diameter of the first forming hole is equal to the diameter of the constraint hole. The first forming hole serves to constrain the pipe body, while the second forming hole is provided. During pipe expansion, the pipe can accumulate in the second forming hole, thereby increasing the wall thickness at the forming end of the pipe and improving its overall strength. The tapered hole is used for forming the tapered section of the pipe, and the third forming hole is used for forming the end pipe.

[0013] Furthermore, a cooling ring groove is formed on the outer periphery of the outer forming column, and sealing ring grooves are respectively provided at both ends of the cooling ring groove. Multiple baffles are provided on the outer periphery of the cooling ring groove, and multiple perforations are formed on the baffles. A pair of arc plates are provided on the outer cover of the cooling ring groove, and wing plates are provided at both ends of the arc plates. The wing plates on the same side are connected and fixed by screws. Inset arc plates are provided at both ends of the arc plates, and the inset arc plates are embedded in the sealing ring grooves. Connecting protrusions are provided on the arc plates, and connectors are provided on the connecting protrusions. By setting the corresponding baffles on the outer forming column, the structural strength of the outer forming column can be strengthened, and problems such as deformation or cracking of the outer forming column during use can be avoided. The setting of the cooling ring groove facilitates the flow of cooling water, thereby quickly cooling the pipe fitting, so that the formed end has greater strength, and it also facilitates the shaping of the formed section.

[0014] Furthermore, the inner mold includes a mounting frustum, on which a first forming post is provided. A tapered post is formed at one end of the first forming post, and a second forming post is provided at the other end of the tapered post. The diameter of the first forming post is larger than the diameter of the second forming post. The first forming post and a third forming hole cooperate to form the end of the pipe fitting. The tapered post and the tapered hole cooperate to form a tapered tube. The second forming post and the second forming hole cooperate to form the end of the pipe body. Furthermore, the gaps between the first forming post and the third forming hole, the gap between the tapered post and the tapered hole, and the gap between the second forming post and the second forming hole are all equal in size, and these gaps are greater than the wall thickness of the pipe body portion of the fitting.

[0015] Furthermore, the movable mechanism includes a downwardly extending convex plate mounted on a mounting platform. One end of the upper plate has a movable notch, within which the downwardly extending convex plate moves. A second hydraulic cylinder is mounted on the lower wall of the upper plate. The movable end of the second hydraulic cylinder has a push sleeve, inside which a push rod passes. One end of the push rod has an inner disc with a spring. The spring facilitates the return movement of the push sleeve and the push rod. The spring is located inside the push sleeve. A positioning hole is located at the outer end of the push sleeve, and a positioning insertion hole is located at the inner end of the push rod. An insertion rod passes through both the positioning insertion hole and the positioning hole. The insertion rod is used to connect the push sleeve and the push rod, ensuring that the connection can be released at an appropriate time, allowing relative movement between the push sleeve and the push rod. The lower end of the insertion rod has a lower ring, extending downwards to form a connecting rod. A second spring is fitted onto the connecting rod. The second spring ensures the stability of the insertion rod after it is limited, and also facilitates locking the connection between the push sleeve and the push rod. The second spring is located below the lower ring. A folded connecting plate is fitted onto the lower end of the connecting rod, which is located below the second spring. A movable block is located at the lower end of the connecting rod, and rollers are rotatably mounted at both ends of the movable block. The rollers are designed to reduce friction during movement. A concave part is fitted onto the roller and mounted on the base plate. An operating hole is provided on the vertical section of the concave part, and the roller moves within the operating hole.

[0016] A pusher plate is installed at the other end of the pusher sleeve. A folded connecting plate is installed on the pusher plate. Pusher arms are installed at both ends of the pusher plate. A pusher wheel is rotatably mounted at the other end of the pusher arm. A pusher plate is fitted on the pusher wheel. The pusher plate has an oblique hole along the vertical direction. The upper end of the oblique hole extends outward at an angle. The pusher wheel passes through the oblique hole. A rack is installed on the inner side of the pusher plate. A vertical hole is opened on the rack. A pair of first guide screws pass through the vertical hole. A T-shaped plate is provided at the outer end of the first guide screw. L-shaped plates are bent at the upper and lower ends of the T-shaped plate. A pair of second guide screws are provided on the L-shaped plate. A guide inner plate is fitted on the inner end of the second guide screw. A transverse guide hole is opened on the guide inner plate. The inner end of the second guide screw passes through the transverse guide hole. The first guide screws guide and limit the vertical movement of the rack, thus ensuring that the rack can only move vertically. The second guide screws and the guide inner plate guide the movement of the T-shaped plate. The components involved here function primarily by pushing the sleeve to move relative to the push rod. This movement causes the pusher wheel to act on the oblique hole, which in turn causes the rack to move downwards. As the rack moves, it allows the inner mold to rotate. This downward rotation of the inner mold prevents its presence from affecting the demolding of the pipe fitting, thus facilitating the demolding process.

[0017] A concave base is installed at the lower end of the downward-extending convex plate. A rotating shaft is located at both ends of the concave base, and a sliding seat is rotatably mounted on the rotating shaft. A guide rail is fitted onto the sliding seat, and the guide rail serves to constrain and guide the sliding seat. An outer plate is installed on the outer side of the guide rail and is mounted on the upper plate via a mounting bracket. An oblong hole is formed on the outer plate. When the rotating shaft moves to the end of the oblong hole, the connection between the push sleeve and the push rod is eliminated, causing the push sleeve to move. This movement causes the rack to move. The rotating shaft passes through the oblong hole, and its outer end passes through a T-shaped plate. A gear is mounted on the outer end of the rotating shaft, meshing with the rack. When the rack moves, the gear rotates, causing the inner mold to rotate downwards, thus preventing the inner mold from affecting the removal of the pipe fitting. When the inner mold is pulled out from the end of the pipe fitting, the locking action of the insert rod prevents relative movement between the push sleeve and the push rod. This also locks the rack and pinion gears. The inner mold rotates only when it is pulled out of the pipe fitting. This method is primarily for facilitating demolding and reducing resistance during demolding. A rotating boss is provided on the concave base, and a rotating shaft is located at the lower end of the rotating boss. A concave head is rotatably mounted on the rotating shaft and is installed on the outer end of the push rod. The rotating shaft and the push rod are coaxial.

[0018] Furthermore, the outer end of the push sleeve is provided with multiple limiting protrusions, and a limiting groove is formed on the outer periphery of the push rod, with the limiting protrusions passing through the limiting groove. The limiting protrusions and limiting grooves can limit the push rod so that the insertion hole and the positioning hole can be aligned.

[0019] Furthermore, the function hole includes a first transverse hole located on the inner end of the vertical section of the concave part. An oblique hole is formed at the other end of the first transverse hole, with its outer end extending downwards at an angle. A second transverse hole is formed at the other end of the oblique hole. When the roller moves through the first transverse hole, it allows the insert rod to be inserted into the insertion hole and positioning hole. When the roller rolls at the oblique hole, it allows the insert rod to move downwards, thus eliminating the connection between the push sleeve and the push rod. When the roller moves within the second transverse hole, the sleeve moves along the axial direction of the push rod. This structural design facilitates the demolding and rotation of the inner mold, thereby facilitating the ejection of the fitting.

[0020] The advantages of the above technical solution are:

[0021] This invention enables the forming of pipe fittings, and ensures that the non-deformable sections do not deform during the forming process. Furthermore, it facilitates the demolding of the pipe fittings after deformation. Attached Figure Description

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will now be described in further detail with reference to the accompanying drawings.

[0023] Figure 1 shows a three-dimensional structural diagram of the aluminum tube end forming device.

[0024] Figure 2 shows a three-dimensional structural diagram of the mold.

[0025] Figure 3 shows a three-dimensional structural diagram of the outer mold.

[0026] Figure 4 shows a cross-sectional view of the outer mold.

[0027] Figure 5 shows a three-dimensional structural diagram of the arc plate.

[0028] Figure 6 shows a cross-sectional view of the aluminum tube during forming.

[0029] Figure 7 shows a three-dimensional structural diagram of the end-push mechanism.

[0030] Figure 8 shows a three-dimensional structural diagram of the inner mold.

[0031] Figure 9 shows a three-dimensional structural diagram of the inner mold and the lower protruding plate.

[0032] Figure 10 shows a three-dimensional structural diagram of the moving mechanism.

[0033] Figure 11 shows a three-dimensional structural diagram of the second hydraulic cylinder.

[0034] Figure 12 shows a cross-sectional view of the second hydraulic cylinder.

[0035] Figure 13 shows a three-dimensional structural diagram of the push sleeve and its connecting components.

[0036] Figure 14 shows a three-dimensional structural diagram of the insertion rod and its connecting components.

[0037] Figure 15 shows a three-dimensional structural diagram of the push rod and its connecting components.

[0038] Figure 16 shows a partial three-dimensional structural diagram of the active mechanism.

[0039] Figure 17 shows a partial three-dimensional structural diagram of the active mechanism.

[0040] Figure 18 shows a three-dimensional structural diagram of the formed aluminum tube. Detailed Implementation

[0041] As shown in Figure 1, an aluminum tube end forming device includes a base 1, an outer forming unit 2 installed at one end of the base 1, and an inner forming unit 3 installed at the other end of the base 1.

[0042] As shown in Figure 1, the base 1 includes a base plate 10, on which a pair of support plates 11 are mounted, and an upper plate 12 is provided at the upper end of the support plates 11.

[0043] As shown in Figures 2 to 7, the outer forming unit 2 includes a mounting base 200 installed at one end of the upper plate 12. A first hydraulic cylinder 201 is installed on the mounting base 200. The first hydraulic cylinder 201 is movably provided with an end push mechanism. A constraint table 203 is installed on the upper plate 12. The constraint table 203 has a constraint hole along its length. The end push mechanism passes through the constraint hole. An outer mold is installed at the other end of the constraint table 203.

[0044] The end-pushing mechanism includes a concave mounting bracket 202 mounted on the movable end of the first hydraulic cylinder 201. An end-pushing plate 224 is mounted on the concave mounting bracket 202. The diameter of the end-pushing plate 224 is smaller than the diameter of the constraint hole. Three guide holes 225 are arranged in a circumferential array on the end-pushing plate 224. A limit pin passes through the guide hole 225. An inner top arc plate 231 is provided on the inner end of the limit pin. An end protrusion plate 242 is provided at the end of the inner top arc plate 231. The inner wall of the inner top arc plate 231 is provided with an inner convex plate 230. Multiple pairs of connecting plates 229 are hinged to the inner convex plate 230. An outer convex plate 228 is hinged to the other end of the connecting plate 229. A central column 227 is provided inside the outer convex plate 228. A connecting screw 226 is provided at the outer end of the central column 227. The end of the connecting screw 226 is installed on the end push plate 224. A movable threaded sleeve 232 is screwed onto the connecting screw 226. A collar 233 is rotatably provided on the movable threaded sleeve 232. Three convex plates 234 are provided on the outer shaft of the collar 233. A pair of end connecting plates 235 are hinged to the outer end of each convex plate 234. The outer end of the end connecting plate 235 is hinged to the inner convex plate 230. There is an included angle between the end connecting plate 235 and the connecting plate 229. A sleeve 238 is fitted onto the connecting screw 226. A hexagonal groove is provided on the inner end of the sleeve 238. A deflection plate 239 is provided on the outer end of the sleeve 238. A gripping rod 240 is provided on the outer end of the deflection plate 239. An arc-shaped hole 241 is provided on the end push plate 224. The gripping rod 240 passes through the arc-shaped hole 241.

[0045] The outer mold includes a mounting plate 204 installed at the end of the constraint table 203. The mounting plate 204 is provided with an outer forming post 205. A first forming hole 210 is opened at the root of the outer forming post 205. The first forming hole 210 passes through the mounting plate 204. A second forming hole 211 is formed at the other end of the first forming hole 210. A tapered hole 212 is formed at the other end of the tapered hole 212. A third forming hole 213 is opened at the other end of the tapered hole 212. The diameter of the third forming hole 213 is larger than the diameter of the second forming hole 211. The diameter of the second forming hole 211 is larger than the diameter of the first forming hole 210. The diameter of the first forming hole 210 is the same as the diameter of the constraint hole. The outer circumference of the outer forming column 205 is provided with a cooling ring groove 207. The two ends of the cooling ring groove 207 are respectively provided with sealing ring grooves 206. Multiple partitions 208 are provided on the outer circumference of the cooling ring groove 207. Multiple perforations 209 are formed on the partitions 208. A pair of arc plates 221 are provided on the outer cover of the cooling ring groove 207. The two ends of the arc plates 221 are respectively provided with wing plates 220. The wing plates 220 on the same side are connected and fixed by screws. The two ends of the arc plates 221 are respectively provided with embedded arc plates 222. The embedded arc plates 222 are embedded in the sealing ring grooves 206. The arc plates 221 are respectively provided with connecting protrusions 218. The connecting protrusions 218 are provided with connectors 219.

[0046] As shown in Figures 8 to 17, the inner forming unit 3 includes a movable mechanism mounted on the base 1, and an inner mold is mounted on the movable mechanism. The inner mold includes a mounting frustum 300, on which a first forming column 301 is mounted. A conical column 302 is formed at the other end of the first forming column 301, and a second forming column 303 is formed at the other end of the conical column 302. The diameter of the first forming column 301 is larger than the diameter of the second forming column 303. The movable mechanism includes a lower extension protrusion 304 mounted on the mounting frustum 300. One end of the upper plate 12 has a movable notch 13, and the lower extension protrusion 304 moves within the movable notch 13. A second hydraulic cylinder 305 is mounted on the lower wall of the upper plate 12. The movable end of the second hydraulic cylinder 305 has a push sleeve 306, and a push rod 307 passes through the push sleeve 306. The outer end of the push sleeve 306 has multiple limiting protrusions, and a limiting groove is formed on the outer periphery of the push rod 307, through which the limiting protrusions pass. One end of the push rod 307 is provided with an inner plate 308, on which a spring 309 is provided. The spring 309 is located inside the push sleeve 306. A positioning hole 311 is opened at the outer end of the push sleeve 306, and a positioning insertion hole 310 is opened at the inner end of the push rod 307. An insertion rod 312 passes through the positioning insertion hole 310 and the positioning hole 311. A lower ring 313 is provided at the lower end of the insertion rod 312. A connecting rod 315 extends downward from the lower ring 313. A second spring 314 is sleeved on the connecting rod 315. The second spring 314 is located below the lower ring 313. A folded connecting plate 317 is sleeved at the lower end of the connecting rod 315. The connecting plate 317 is located at the lower end of the second spring 314. The lower end of the connecting rod 315 is provided with a movable block 316. Rollers 318 are rotatably provided at both ends of the movable block 316. A concave part 319 is sleeved on the roller 318. The concave part 319 is installed on the base plate 10. An action hole is provided on the vertical section of the concave part 319. The roller 318 moves in the action hole. The action hole includes a first transverse hole 320 provided on the inner end of the vertical section of the concave part 319. An oblique hole 321 is provided at the other end of the first transverse hole 320. The outer end of the oblique hole 321 extends downward at an angle. A second transverse hole 322 is provided at the other end of the oblique hole 321.

[0047] A pusher plate 323 is installed at the other end of the pusher sleeve 306. A folded connecting plate 317 is installed on the pusher plate 323. Pusher arms 324 are installed at both ends of the pusher plate 323. A pusher wheel 325 is rotatably provided at the other end of the pusher arm 324. A pusher plate 326 is fitted on the pusher wheel 325. An oblique hole 327 is opened in the vertical direction on the pusher plate 326. The upper end of the oblique hole 327 extends outward at an angle. The pusher wheel 325 passes through the oblique hole 327. A rack 338 is installed on the inner side of the pusher plate 326. A vertical hole 339 is provided on the rack 338. A pair of first guide screws 340 are inserted into the vertical hole 339. A T-shaped plate 341 is provided on the outer end of the first guide screw 340. L-shaped plates 342 are bent at the upper and lower ends of the T-shaped plate 341 respectively. A pair of second guide screws 343 are provided on the L-shaped plate 342. A guide inner plate 344 is sleeved on the inner end of the second guide screw 343. A transverse guide hole 345 is provided on the guide inner plate 344. The inner end of the second guide screw 343 passes through the transverse guide hole 345.

[0048] A concave base 328 is installed at the lower end of the lower protruding plate 304. A rotating shaft 329 is provided at both ends of the concave base 328. A sliding seat 333 is rotatably mounted on the rotating shaft 329. A guide rail 334 is fitted onto the sliding seat 333. An outer plate 335 is installed on the outer side of the guide rail 334. The outer plate 335 is mounted on the upper plate 12 via a mounting bracket. An oblong hole 336 is provided on the outer plate 335, and the rotating shaft 329 passes through the oblong hole 336. The outer end of the shaft 329 passes through the T-shaped plate 341. The outer end of the shaft 329 is provided with a gear 337, which meshes with the rack 338. The concave base 328 is provided with a rotating boss 330. The lower end of the rotating boss 330 is provided with a rotating shaft 331. A concave head 332 is rotatably provided on the rotating shaft 331. The concave head 332 is installed on the outer end of the push rod 307. The rotating shaft 331 and the rotating shaft 329 are coaxially arranged.

[0049] This embodiment involves the following steps during operation:

[0050] Step 1: First, age the deformed end of the pipe fitting. The aging temperature of the deformed end is 120℃, and the aging temperature of other parts is 180℃. After aging treatment, the hardness of the pipe fitting can be improved, thereby preventing it from deforming during the forming process.

[0051] Step 2: After heating the deformed end to 180°C, immerse the head in 100°C oil for 5 seconds. The oil immersion method facilitates demolding after successful deformation. During the deformation process, it can prevent the pipe from sticking to the inner and outer molds due to the large friction, and improve the molding effect.

[0052] Step 3: The heated pipe fitting is placed on the inner top arc plate 231. Then, the operator places the sleeve 238 on the end of the movable threaded sleeve 232 and repeatedly rotates the movable threaded sleeve 232 by holding the rod 240, so that the inner top arc plate 231 is pressed against the inner wall of the pipe fitting.

[0053] Step 4: Start the first hydraulic cylinder 201 to drive the pipe to move into the constraint hole. When the pipe moves to the tapered column 302, the end of the pipe will be expanded by the tapered column 302. Then, the pipe continues to move under the push of the first hydraulic cylinder 201. When its end moves to the first forming column 301, the forming operation of the pipe will be completed. Afterwards, under the continuous push of the first hydraulic cylinder 201, the end of the pipe will fill the gap between the first forming column 301 and the third forming hole 213, the gap between the tapered column 302 and the tapered hole 212, and the gap between the second forming column 303 and the second forming hole 211, and the wall thickness of the deformed section of the pipe will increase. After forming, the end of the pipe is cooled and shaped by the introduced cooling water.

[0054] Step 5: Activate the second hydraulic cylinder 305, causing the push sleeve 306 and push rod 307 to move outward synchronously. During the movement, the push lower protrusion 304 will move outward along the length of the waist-shaped hole 336 until the rotating shaft 329 moves to the end of the waist-shaped hole 336. During the above movement, the roller 318 will also move from the first transverse hole 320 through the inclined hole 321 to the second transverse hole 322, finally causing the insertion rod 312 to move out of the positioning insertion hole 310 and the positioning hole 311. During the above movement, the entire inner mold will be pulled outward from the end of the tube. When the rotating shaft 329 moves to the end of the oblong hole 336, since the insertion rod 312 cancels the connection between the push sleeve 306 and the push rod 307, and the concave base 328 connected to the push rod 307 does not move forward, when the second hydraulic cylinder 305 continues to act, the push sleeve 306 will move outward, and the push rod 307 will gradually disappear into the push sleeve 306. As the push sleeve 306 moves outward, the push wheel 325 will move. When the push wheel 325 moves, it will act on the oblique hole 327, which will cause the rack 338 to move downward. The downward movement of the rack 338 will cause the gear 337 and the rotating shaft 329 to rotate, thereby causing the concave base 328 to rotate forward 90 degrees around the rotating shaft 331. At this time, the obstruction of the inner mold to the tube will be canceled.

[0055] Step 6: Activate the first hydraulic cylinder 201 to gradually move the pipe out of the outer mold, then cancel the supporting effect of the inner top arc plate 231 and pull out the pipe.

[0056] Step 7: Place the ejected pipe into water at 30°C for cooling.

[0057] Step 8: Insulate the pipe fittings at 175℃ for 9 hours.

[0058] The pipe fittings obtained through the above process can ensure concentricity within 10 microns.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

Claims

1. An aluminum tube end forming device, characterized in that, The machine includes a base (1), an outer forming unit (2) installed at one end of the base (1), and an inner forming unit (3) installed at the other end of the base (1); the base (1) includes a base plate (10), a pair of support plates (11) are installed on the base plate (10), and an upper plate (12) is provided at the upper end of the support plates (11); the outer forming unit (2) includes a mounting seat (200) installed at one end of the upper plate (12), a first hydraulic cylinder (201) is installed on the mounting seat (200), the movable end of the first hydraulic cylinder (201) is provided with an end push mechanism, a constraint table (203) is installed on the upper plate (12), the constraint table (203) has a constraint hole along its length, the end push mechanism passes through the constraint hole, and the constraint table (203) The other end of the upper plate (12) is equipped with an outer mold; the inner forming unit (3) includes a movable mechanism on the base (1), and an inner mold is provided on the movable mechanism; the inner mold includes a mounting truncated cone (300), a first forming column (301) is provided on the mounting truncated cone (300), a conical column (302) is formed at the other end of the first forming column (301), and a second forming column (303) is provided at the other end of the conical column (302), the diameter of the first forming column (301) is larger than the diameter of the second forming column (303); the movable mechanism includes a lower protruding plate (304) installed on the mounting truncated cone (300), and a movable notch (13) is opened at one end of the upper plate (12), the lower protruding plate (304) is inside the movable notch (13). The upper plate (12) is equipped with a second hydraulic cylinder (305) on its lower wall. The movable end of the second hydraulic cylinder (305) is provided with a push sleeve (306). A push rod (307) is inserted inside the push sleeve (306). One end of the push rod (307) is provided with an inner plate (308). A spring (309) is provided on the inner plate (308). The spring (309) is located inside the push sleeve (306). A positioning hole (311) is opened at the outer end of the push sleeve (306). A positioning insertion hole (310) is opened at the inner end of the push rod (307). An insertion rod (312) is inserted into the positioning insertion hole (310) and the positioning hole (311). A lower ring (313) is provided at the lower end of the insertion rod (312). A connecting rod (315) extends downward from the lower ring (313). A second spring (314) is sleeved on the connecting rod (315). The second spring (314) is located on the lower side of the lower ring (313). A folded connecting plate (317) is sleeved on the lower end of the connecting rod (315). The folded connecting plate (317) is located on the lower end of the second spring (314). A movable block (316) is provided at the lower end of the connecting rod (315). Rollers (318) are rotatably provided at both ends of the movable block (316). A concave part (319) is sleeved on the roller (318). The concave part (319) is installed on the base plate (10). An action hole is provided on the vertical section of the concave part (319). The roller (318) moves in the action hole.A pusher plate (323) is installed at the other end of the pusher sleeve (306). A folded connecting plate (317) is installed on the pusher plate (323). Pusher arms (324) are installed at both ends of the pusher plate (323). A pusher wheel (325) is rotatably provided at the other end of the pusher arm (324). A pusher plate (326) is fitted on the pusher wheel (325). An oblique hole (327) is opened in the vertical direction on the pusher plate (326). The upper end of the oblique hole (327) extends outward at an angle. The pusher wheel (325) passes through the oblique hole (327). A rack (338) is installed on the inner side of the pusher plate (326). A vertical hole (339) is opened on the rack (338). 339) has a pair of first guide screws (340) inside, and a T-shaped plate (341) is provided at the outer end of the first guide screw (340). The upper and lower ends of the T-shaped plate (341) are respectively bent into L-shaped plates (342). A pair of second guide screws (343) are provided on the L-shaped plate (342). A guide inner plate (344) is sleeved on the inner end of the second guide screw (343). A transverse guide hole (345) is opened on the guide inner plate (344). The inner end of the second guide screw (343) passes through the transverse guide hole (345). A concave base (328) is installed at the lower end of the lower protruding plate (304). A rotating shaft (329) is provided at both ends of the concave base (328). A sliding seat (333) is rotatably mounted on the upper plate (12). A guide rail (334) is fitted on the sliding seat (333). An outer plate (335) is mounted on the outer side of the guide rail (334). The outer plate (335) is mounted on the upper plate (12) by a mounting bracket. An oblong hole (336) is opened on the outer plate (335). A rotating shaft (329) passes through the oblong hole (336). The outer end of the rotating shaft (329) passes through the T-shaped plate (341). A gear (337) is provided on the outer end of the rotating shaft (329). The gear (337) meshes with the rack (338). A rotating boss (330) is provided on the concave base (328). A rotating shaft (337) is provided at the lower end of the rotating boss (330). 1) A concave head (332) is rotatably mounted on the rotating shaft (331), and the concave head (332) is installed on the outer end of the push rod (307). The rotating shaft (331) and the rotating shaft (329) are coaxially arranged. The outer end of the push sleeve (306) is provided with multiple limiting protrusions. A limiting groove is opened on the outer periphery of the push rod (307), and the limiting protrusions pass through the limiting groove. The working hole includes a first transverse hole (320) provided on the inner end of the vertical section of the concave part (319). An oblique hole (321) is opened at the other end of the first transverse hole (320). The outer end of the oblique hole (321) extends downward at an incline. A second transverse hole (322) is provided at the other end of the oblique hole (321).

2. The aluminum tube end forming device according to claim 1, characterized in that, The end-pushing mechanism includes a concave mounting bracket (202) installed on the movable end of the first hydraulic cylinder (201). An end-pushing plate (224) is installed on the concave mounting bracket (202). The diameter of the end-pushing plate (224) is smaller than the diameter of the constraint hole. Three guide holes (225) are arranged in a circumferential array on the end-pushing plate (224). A limit pin passes through the guide hole (225). An inner top arc plate (231) is provided on the inner end of the limit pin. An inner convex plate (230) is provided on the inner wall of the inner top arc plate (231). Multiple pairs of connecting plates (229) are hinged on the inner convex plate (230). An outer convex plate (228) is hinged to the other end of the connecting plate (229). The outer convex plate (228) is provided with a central column (227), and the outer end of the central column (227) is provided with a connecting screw (226). The end of the connecting screw (226) is installed on the end push plate (224). A movable screw sleeve (232) is screwed onto the connecting screw (226). A collar (233) is rotatably provided on the movable screw sleeve (232). The outer shaft of the collar (233) is provided with three convex plates (234). A pair of end connecting plates (235) are hinged to the outer end of each convex plate (234). The outer end of the end connecting plate (235) is hinged to the inner convex plate (230). There is an included angle between the end connecting plate (235) and the connecting plate (229).

3. The aluminum tube end forming device according to claim 2, characterized in that, The end of the inner top arc plate (231) is provided with an end protrusion plate (242).

4. The aluminum tube end forming device according to claim 2, characterized in that, A sleeve (238) is fitted on the connecting screw (226). A hexagonal groove is provided on the inner end of the sleeve (238). A deflection plate (239) is provided on the outer end of the sleeve (238). A gripping rod (240) is provided on the outer end of the deflection plate (239). An arc-shaped hole (241) is provided on the end push plate (224). The gripping rod (240) passes through the arc-shaped hole (241).

5. The aluminum tube end forming device according to claim 1, characterized in that, The outer mold includes a mounting plate (204) installed at the end of the constraint table (203). The mounting plate (204) is provided with an outer forming post (205). A first forming hole (210) is opened at the root of the outer forming post (205). The first forming hole (210) passes through the mounting plate (204). A second forming hole (211) is formed at the other end of the first forming hole (210). A conical hole (212) is formed at the other end of the second forming hole (211). A third forming hole (213) is opened at the other end of the conical hole (212). The diameter of the third forming hole (213) is larger than the diameter of the second forming hole (211). The diameter of the second forming hole (211) is larger than the diameter of the first forming hole (210). The diameter of the first forming hole (210) is the same as the diameter of the constraint hole.

6. The aluminum tube end forming device according to claim 5, characterized in that, The outer circumference of the outer forming column (205) is provided with a cooling ring groove (207), and the two ends of the cooling ring groove (207) are respectively provided with sealing ring grooves (206). Multiple partitions (208) are provided on the outer circumference of the cooling ring groove (207), and multiple perforations (209) are formed on the partitions (208). A pair of arc plates (221) are provided on the outer cover of the cooling ring groove (207). The two ends of the arc plates (221) are respectively provided with wing plates (220). The wing plates (220) on the same side are connected and fixed by screws. The two ends of the arc plates (221) are respectively provided with embedded arc plates (222). The embedded arc plates (222) are embedded in the sealing ring groove (206). The arc plates (221) are respectively provided with connecting protrusions (218), and the connecting protrusions (218) are provided with connectors (219).

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