A corrugated pipe hydroforming machine

Abstract

The present invention discloses a corrugated pipe hydroforming machine, which includes a die body, a separating mechanism, a die closing mechanism, and a diaphragm pushing device; the die body includes a lower die and an upper die, and both the lower die and the upper die include a plurality of diaphragms; the die closing mechanism includes the separating mechanism, an upper die holder, and a die closing driving mechanism; the die locking mechanism includes a die locking plate for locking the upper die and the lower die and a die locking driving mechanism for driving the die locking plate to move towards the die closing part on the die; the diaphragm pushing device includes a diaphragm push rod module for pushing the diaphragm, a plugging module for plugging the inner cavity of the pipe fitting, a driving mechanism for driving the diaphragm push rod module and the plugging module to move, and a support frame for supporting the driving mechanism. This forming machine can not only quickly separate or push together the diaphragms to improve the processing efficiency of the corrugated pipe, but also has a compact structure and is easy to operate.

Description

Technical Field

[0001] The present invention relates to a bellows manufacturing device, and more particularly to a bellows hydroforming machine. Background Art

[0002] A metal bellows is a tubular part with a continuously corrugated special-shaped cross-section and is an important component of bellows assemblies. Due to its special structural form, it has functions superior to those of straight-wall pipe fittings or metal hoses in terms of connection, sealing, shock absorption, etc. There are various types of forming technologies for metal bellows, and the hydroforming technology is widely used in the field of bellows forming; especially in the production of thin-walled bellows with medium and small diameters, hydroforming occupies a large market share; the bellows hydroforming technology is a typical application of modern hydroforming in pipe forming; the hydroformed metal bellows has fewer forming processes, high production efficiency, good product quality, high automation degree of the forming equipment, and simple operation. However, the existing hydroformed metal bellows has a low automation degree, and each forming pad needs to be manually placed and removed, resulting in high labor intensity, poor sealing effect of the three-piece lock, liquid leakage, difficulty in achieving a high forming pressure, difficulty in controlling the forming pressure inside the tube blank to be constant, the mold outer cover is in the form of a semi-cylindrical opening and closing, and the coaxiality of the formed bellows is poorly controlled.

[0003] To solve the above problems, a quick corrugated pipe forming die guiding and positioning tooling disclosed in the invention patent application with the application publication number of CN 111250586 A includes a base and positioning columns. Three positioning columns are evenly inserted into the inner wall of the base. A top plate is fixedly assembled on the outer walls of the three positioning columns. A lower plug cover is fixedly assembled at the upper end of the base. A sealed pipe section is provided inside the lower plug cover. A second end piece is fixedly assembled at the upper end of the lower plug cover. A second sealing ring fixed to the lower plug cover is assembled on the inner wall of the second end piece. A pipe blank is assembled between the second sealing ring and the second end piece. A connecting column is inserted into the inner wall of the top plate. An upper plug cover is fixedly assembled at the lower end of the connecting column. A first end piece is fixedly assembled at the lower end of the upper plug cover. A first sealing ring fixed to the upper plug cover is assembled on the inner wall of the first end piece. The pipe blank is located between the first sealing ring and the first end piece. A number of limiting structures are clamped on the outer walls of the positioning columns. A positioning block is fixedly assembled at the upper end of each limiting structure. The positioning block is sleeved on the outer wall of the positioning column. A support plate is fixedly assembled at the inner side end of each positioning block. The upper end of the support plate is in contact with the first end piece. The upper ends of the remaining support plates are all assembled with middle die pieces. The base is connected to the three positioning columns through a linkage structure. The working principle of the above-mentioned forming die guiding and positioning tooling is as follows: Before hydroforming, select the forming die according to the specification parameters of the corrugated pipe to be processed. Select a set of mounting holes at the bottom according to the outer diameter size of the forming die to install the limiting columns, and adjust the limiting structures on the positioning columns to the specified scale according to the technological process, and complete the installation and positioning. During hydroforming, place the prefabricated pipe blank part on the lower plug cover, install the second sealing ring, and then place the formed middle die pieces on the support plates inside the positioning blocks in sequence. Install the first sealing ring at the upper port of the pipe blank to be processed with corrugations, and install the upper plug. Start the hydraulic press. The connecting column compresses the upper plug cover. Inject high-pressure emulsified liquid into the sealed pipe section. When the pressure reaches the yield strength of the pipe blank, the pipe blank bulges out the initial wave between two adjacent die pieces. At this time, keep the pressure in the pipe constant, rotate the linkage structure, and the three positioning columns are linked to quickly remove the support plates inside the positioning blocks as a whole. Then pressurize to the forming pressure, and the press feeds evenly. The middle die piece, the first end piece and the second end piece are all in contact, extruding the initial wave to the specified wave thickness, and the pipe wall fits the concave cavity of the die for shaping. After the forming system relieves pressure, retract the connection, open the upper plug cover, remove the die pieces, and obtain the hydroformed corrugated pipe part. Although the above-mentioned forming die guiding and positioning tooling can quickly remove the support plates inside the positioning blocks as a whole by rotating the linkage structure after the initial wave is completed, the above-mentioned forming die guiding and positioning tooling still has the following problems: When forming the initial wave by hydroforming, first, it is necessary to adjust the limiting structure to the specified scale, complete the installation and positioning, and then place the formed middle die pieces on the support plates inside the positioning blocks in sequence. This not only has a complex process but also low efficiency, affecting the production progress. Summary of the Invention

[0004] The object of the present invention is to overcome the deficiencies of the prior art and provide a bellows hydroforming machine, which can not only quickly separate or push together the die pieces, improve the processing efficiency of the bellows, but also has a compact structure and is easy to operate.

[0005] The technical solution for the present invention to solve the above technical problems is as follows:

[0006] A bellows hydroforming machine includes a mold body, a mold closing and separating mechanism, a mold locking mechanism, and a die piece pushing device, where:

[0007] The mold body includes a lower mold and an upper mold arranged opposite to each other, and both the lower mold and the upper mold include a plurality of die pieces;

[0008] The mold closing and separating mechanism includes a separating mechanism, an upper mold holder for mounting the die pieces of the upper mold, and a mold closing driving mechanism for driving the upper mold holder to move towards the lower mold; the separating mechanism is arranged on the upper mold holder, and the separating mechanism includes an insert group for separating the die pieces for primary wave forming, an insert mounting rack for mounting the insert group, and an insert driving mechanism for driving the insert group to move towards the tube blank; the insert group includes a plurality of inserts, one ends of the plurality of inserts are mounted on the insert mounting rack, and the other ends extend towards the lower mold, and the lengths of the plurality of inserts decrease in sequence from the center of the mold towards the outside of the mold;

[0009] The mold locking mechanism includes a mold locking plate for locking the upper mold and the lower mold, and a mold locking driving mechanism for driving the mold locking plate to move towards the mold closing part on the mold;

[0010] The die piece pushing device includes a die piece push rod module for pushing the die pieces to move, a plugging module for plugging the inner cavity of the pipe fitting, a driving mechanism for driving the die piece push rod module and the plugging module to move, and a support frame for supporting the driving mechanism.

[0011] The working principle of the above bellows hydroforming machine is as follows:

[0012] The forming die of the corrugated pipe consists of several die plates. The forming of the corrugated pipe is divided into two processes. The first process is the initial wave forming stage. In this stage, two adjacent die plates are separated by inserting plates at a fixed spacing. The second process is the final forming stage. In this stage, two adjacent die plates are closely attached, and the final shape of the waveform is controlled by the die cavities of the two adjacent die plates. The specific process of one implementation method from the initial wave forming to the final forming is as follows: First, after the previous corrugated pipe completes deformation in the final forming stage, the push head used to push the die plates together is withdrawn. After the push head is withdrawn, the thrust on the die plate group is released, and the spring in the die plate gives an elastic force to two adjacent die plates, thus springing the two adjacent die plates apart by a certain gap to facilitate the insertion of the inserting plate. At this time, the lower die descends a certain distance, and the upper die ascends a certain distance to facilitate taking out the corrugated pipe that has completed deformation. Then, the pipe blank is hung on the plug head so that the center line of the pipe blank coincides with the center line of the plug head. The die plate pushing device is started. Specifically, the driving mechanism acts, causing the plugging module to move towards the center of the mold, plugging the plug head, and finally playing a role in plugging the inner cavity of the pipe fitting. Then, the lower die ascends to the limit position. Then, the die plate separating mechanism is started. Specifically, the inserting plate driving mechanism acts, driving the inserting plate group to move towards the mold. Since the extension ends of multiple inserting plates are successively farther away from the pipe blank along the direction from the middle to the end of the pipe blank, the inserting plate located in the middle of the pipe blank is the longest and first enters the gap between the adjacent die plates, and pushes the middle die plate towards the end of the pipe blank. Then, the inserting plate driving mechanism continues to act, driving the inserting plate group to continue to move towards the lower die and inserting between two adjacent die plates, thus successively separating the die plates towards the end of the pipe blank and separating them from each other at a distance equal to the width of the inserting plate. When the inserting plate driving mechanism descends to the limit position, the upper die and the inserting plate group simultaneously descend to the limit position. Next, the mold locking mechanism is started. The mold locking driving mechanism acts, driving the mold locking plate to move towards the mold closing part on the mold, and mechanically locking the upper die and the lower die. Next, after the die plates are separated, a pressure medium is introduced, causing the pipe blank to deform outwards between two adjacent die plates to complete the initial wave forming. Next, the inserting plate driving mechanism acts, causing the inserting plate group to move away from the pipe blank, thus withdrawing the inserting plate group from the die plates. Next, the die plate pushing device is started again, causing the die plate push rod module to move towards the center of the mold, thus successively pushing the outer die plates towards the center of the mold. At this time, a constant pressure is maintained inside the pipe fitting, and finally causing two adjacent die plates to fit together. Under the action of the high-pressure medium, the initial wave forms the final waveform in the die cavities of two adjacent die plates.

[0013] In a preferred embodiment of the present invention, the mold locking plate includes a mold locking groove, and the mold locking groove includes an upper locking surface and a lower locking surface. When the locking plate locks the upper die and the lower die after mold closing, the upper locking surface abuts against the outer end surface of the mold closing part of the upper die, and the lower locking surface abuts against the outer end surface of the mold closing part of the lower die.

[0014] In a preferred embodiment of the present invention, the support frame includes a plurality of support rods and a support plate connected to the support rods. One end of each support rod is connected to the mold frame, and the other end extends outward and is fixedly connected to the support plate. The mold piece pusher module includes a pushing sleeve, a pushing member provided at the front end of the pushing sleeve, and a pushing bottom plate provided at the rear end of the pushing sleeve. The pushing bottom plate is slidably connected to the plurality of support rods, and the pushing sleeve is slidably connected to the mold side plate. The plugging module includes a plugging connecting rod and a plugging head provided at the front end of the plugging connecting rod. The plugging connecting rod is sleeved inside the pushing sleeve. The driving mechanism includes a fixing member and an actuating member. The fixing member is installed on the support plate, and the actuating member is connected to the pushing bottom plate and the plugging connecting rod through a connecting assembly.

[0015] In a preferred embodiment of the present invention, the insert mounting frame is arranged above the mold. The upper ends of the plurality of inserts are mounted on the insert mounting frame, and the lower ends extend toward the mold.

[0016] In a preferred embodiment of the present invention, the insert includes a mounting portion for connecting to the insert mounting frame and a guiding portion for facilitating the separation of the mold pieces. The size of the guiding portion gradually decreases from top to bottom, thereby forming a conical structure.

[0017] In a preferred embodiment of the present invention, the insert group includes a right insert group arranged on the right side of the tube blank and a left insert group arranged on the left side of the tube blank.

[0018] In a preferred embodiment of the present invention, the right insert group includes a right front insert group arranged on the front side of the tube blank and a right rear insert group arranged on the rear side of the tube blank. The left insert group includes a left front insert group arranged on the front side of the tube blank and a left rear insert group arranged on the rear side of the tube blank.

[0019] In a preferred embodiment of the present invention, the insert mounting frame includes an insert mounting plate and a connecting frame for mounting the insert mounting plate. The upper end of the insert mounting plate is connected to the connecting frame, and the lower end is connected to the mounting portion of the insert.

[0020] In a preferred embodiment of the present invention, there are two insert mounting plates, one of which is mounted on the front side of the connecting frame and the other is mounted on the rear side of the connecting frame.

[0021] In a preferred embodiment of the present invention, the insert driving mechanism includes an insert driving element and a driving frame for mounting the driving element. The driving frame includes a connecting column and a mounting platform mounted on the connecting column. The mounting platform is located above the connecting frame. The connecting column penetrates through the connecting frame, and a relief hole for avoiding the connecting column is provided on the connecting frame.

[0022] In a preferred embodiment of the present invention, the insert driving element includes an insert driving oil cylinder, the cylinder barrel of which is mounted on the mounting table, and the piston rod of which is connected to the connecting frame.

[0023] In a preferred embodiment of the present invention, there are two locking templates, which are respectively arranged on the front side and the rear side of the mold, and the locking grooves are arranged on the inner sides of the locking templates.

[0024] In a preferred embodiment of the present invention, both ends of the locking templates are connected to the mold frame through a sliding mechanism. The sliding mechanism includes sliders mounted at both ends of the locking templates and slide rails matching the sliders. The slide rails are mounted on the mold frame, and the length direction of the slide rails is arranged along the front-rear direction of the mold.

[0025] In a preferred embodiment of the present invention, the slider includes an upper slider mounted above the locking template and a lower slider mounted below the locking template. The slide rail includes an upper slide rail matching the upper slider and a lower slide rail matching the lower slider.

[0026] In a preferred embodiment of the present invention, it further includes gaskets. The gaskets include an upper gasket arranged above the locking groove and a lower gasket arranged below the locking groove. The bottom surface of the upper gasket constitutes the upper locking surface, and the top surface of the lower gasket constitutes the lower locking surface.

[0027] In a preferred embodiment of the present invention, it further includes a left stop block arranged at the left end inside the locking groove and a right stop block arranged at the right end inside the locking groove.

[0028] In a preferred embodiment of the present invention, the mold locking drive mechanism includes a driving member. The driving member includes a fixed part and a movable part that can slide back and forth relative to the fixed part. The fixed part is mounted on the mold frame, and the end of the movable part is connected to the locking template.

[0029] In a preferred embodiment of the present invention, the driving member is a mold locking oil cylinder. The cylinder barrel of the mold locking oil cylinder constitutes the fixed part, and the piston rod of the mold locking oil cylinder constitutes the movable part.

[0030] In a preferred embodiment of the present invention, the piston rod of the mold locking oil cylinder is connected to the locking template through a connecting block. The connecting block includes a connecting part for connecting with the piston rod and a mounting part for fixedly connecting with the locking template. A threaded hole for connecting with the piston rod is provided on the connecting part, and a screw through hole for connecting with the locking template is provided on the mounting part.

[0031] In a preferred embodiment of the present invention, the connection assembly includes a first connection module connected to the pushing base plate and a second connection module connected to the plugging connecting rod. Among them, the first connection module includes a front connection frame and a rear connection frame. The rear connection frame is connected to the actuator, and the front connection frame is connected to the pushing base plate; the second connection module includes a second driving mechanism, and the second driving mechanism includes a fixed part and a movable part that can slide back and forth relative to the fixed part. The fixed part is arranged on the rear connection frame, and the movable part is connected to the plugging connecting rod.

[0032] In a preferred embodiment of the present invention, the rear connection frame includes a first connecting plate, a second connecting plate, and a plurality of rear connecting rods arranged between the first connecting plate and the second connecting plate; the first connecting plate is connected to the actuator through a connecting cylinder. The connecting cylinder is fixedly connected to the first connecting plate and is clamped on the actuator.

[0033] In a preferred embodiment of the present invention, the front connection frame includes a third connecting plate, a fourth connecting plate, and a plurality of front connecting rods arranged between the third connecting plate and the fourth connecting plate; the fourth connecting plate is connected to the second connecting plate, and the fourth connecting plate is connected to the pushing base plate.

[0034] In a preferred embodiment of the present invention, it further includes a strengthening support module. The strengthening support module includes a strengthening frame arranged on the mold side plate and a sliding mechanism arranged on the strengthening frame. The sliding mechanism includes a slider and a slide rail matching the slider. The length direction of the slide rail is arranged along the axis direction of the support rod; the upper top surface of the slider is connected to the bottom of the pushing base plate.

[0035] In a preferred embodiment of the present invention, the strengthening frame includes a strengthening mounting plate, a strengthening support plate, and a strengthening rib plate. One end of the strengthening mounting plate is connected to one end of the strengthening support plate to form an L-shaped structure. The strengthening rib plate is arranged between the strengthening mounting plate and the strengthening support plate. The strengthening mounting plate is mounted on the mold side plate; the slide rail is mounted on the strengthening support plate.

[0036] In a preferred embodiment of the present invention, there are four support rods, and the four support rods are symmetrically distributed on the support plate.

[0037] In a preferred embodiment of the present invention, the pushing member includes a connecting sleeve and a pushing block arranged at the front end of the connecting sleeve. The rear end of the connecting sleeve is fixedly connected to the front end of the pushing sleeve; avoiding holes for avoiding the plugging head are provided in both the pushing block and the connecting sleeve.

[0038] In a preferred embodiment of the present invention, the driving mechanism is a driving oil cylinder, the cylinder barrel of the driving oil cylinder constitutes the fixing member, and the piston rod of the driving oil cylinder constitutes the executing member.

[0039] In a preferred embodiment of the present invention, a through hole for introducing pressure liquid is provided inside the plug connecting rod. One end of the through hole communicates with the liquid through hole of the plug head, and the other end communicates with the liquid supply mechanism through a pipeline.

[0040] In a preferred embodiment of the present invention, the die plate includes a die plate body provided with guide post holes and guide rod holes, and locking die parts arranged on both sides of the die plate body. Among them, the die plate body includes a mold closing part with one end being a plane and a connecting part arranged on the mold closing part in a trapezoidal structure; a guide groove for accommodating a guide piece is provided on the mold closing part, a semi-circular accommodating hole for matching with the outer diameter of the pipe fitting is provided at the center of the mold closing part, and semi-circular forming cavities are provided on the front and back sides of the accommodating hole; the locking die part includes a locking die section and a guiding section, and chamfered inclined surfaces are provided on both sides of the guiding section.

[0041] In a preferred embodiment of the present invention, there are multiple groups of guide rod holes. Each group of guide rod holes includes two guide rod holes. Among the two guide rod holes, a spring counterbore for installing a spring is provided at one end of one guide rod hole, and a spring counterbore for installing a spring is provided at the other end of the other guide rod hole.

[0042] In a preferred embodiment of the present invention, there are four groups of guide rod holes, and the four groups of guide rod holes are distributed at the four corners of the die plate body.

[0043] In a preferred embodiment of the present invention, there are two guide post holes, and the two guide post holes are symmetrically arranged on the die plate body.

[0044] In a preferred embodiment of the present invention, chamfered inclined surfaces are provided on both the top surface and the bottom surface of the guiding section.

[0045] In a preferred embodiment of the present invention, the top of the locking die section is lower than the top of the guiding section.

[0046] In a preferred embodiment of the present invention, there are two guide grooves, and the two guide grooves are arranged on both sides of the accommodating hole.

[0047] The present invention has the following beneficial effects compared with the prior art:

[0048] 1. For the bellows hydroforming machine of the present invention, the insert driving mechanism drives the insert group to move towards the mold, so that the inserts are inserted between adjacent two die plates, and the die plates can be quickly separated. When the driving mechanism drives the insert group to move away from the mold, the inserts can be quickly separated from the die plates, thereby effectively improving the production efficiency of the bellows.

[0049] 2. For the bellows hydroforming machine of the present invention, the distances between the extending ends of multiple inserts and the tube blank increase successively along the direction from the middle to the end of the tube blank. When the insert driving mechanism drives the insert group to move towards the mold, the inserts can enter between the die plates in sequence, so as to squeeze the die plates towards the end of the tube blank in sequence, and finally separate the die plates orderly. The structure is simple and the design is ingenious.

[0050] 3. For the bellows hydroforming machine of the present invention, by setting a locking template, the upper die and the lower die after mold closing are mechanically locked by the locking grooves on the locking template, and the mold locking is reliable and stable; by mechanically locking the upper die and the lower die through the locking template, there is no need to set up a special power mechanism for providing mold locking force, which greatly saves the production cost.

[0051] 4. For the bellows hydroforming machine of the present invention, the die plate pushing device is arranged on the mold frame. Compared with the way of additionally arranging independent mounting frames on both sides of the mold, it can not only greatly save the installation space, reduce the influence on the installation of other components, but also greatly reduce the consumables and save the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is the front view of the bellows hydroforming machine of the present invention.

[0053] Figures 2 - 3 It is the schematic diagram of the bellows forming machine of the present invention, wherein, Figure 2 is the front view, Figure 3 is the perspective view.

[0054] Figures 4 - 5 It is the schematic diagram of the insert group inserting into the upper die to separate the die plates, wherein, Figure 4 is the front view, Figure 5 is the perspective view.

[0055] Figures 6 - 7 It is the bellows mold closing mechanism of the present invention, wherein, Figure 6 is the front sectional view, Figure 7 is the perspective view.

[0056] Figures 8 - 11 It is the schematic diagram of the mold locking mechanism, wherein, Figure 8 is the front view of the mold locking mechanism installed on the mold frame, Figure 9 is the perspective view of the mold locking mechanism installed on the mold frame; Figure 10 is the front view of the mold locking mechanism on one side of the mold, Figure 11 is the perspective view of the mold locking mechanism on one side of the mold.

[0057] Figures 12 - 13 It is the schematic diagram before the mold closing of the mold, wherein Figure 12 is the front view, Figure 13 is the left view.

[0058] Figure 14 It is the front view of the die sheet pushing device.

[0059] Figure 15 It is the top view of the die sheet pushing device.

[0060] Figure 16 It is the three-dimensional view of the die sheet pushing device in one direction.

[0061] Figure 17 It is the three-dimensional view of the die sheet pushing device in another direction.

[0062] Figure 18 It is the front view of the die sheet.

[0063] Figure 19 It is the three-dimensional view of the die sheet in one direction.

[0064] Figure 20 It is the three-dimensional view of the die sheet in another direction.

[0065] Figure 21 It is the three-dimensional view of the die sheet with guide sheets installed. Specific implementation mode

[0066] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the implementation modes of the present invention are not limited thereto.

[0067] See Figures 1 - 21 , a corrugated pipe hydroforming machine, comprising a mold body, a mold closing and separating mechanism A, a mold locking mechanism B and a die sheet pushing device C, wherein:

[0068] The mold body includes a lower mold 13B and an upper mold 12B which are oppositely arranged, and both the lower mold 13B and the upper mold 12B include a plurality of die sheets 4A;

[0069] The mold closing and separating mechanism includes a separating mechanism, an upper mold frame 10A for installing the die sheets 4A of the upper mold 12B, and a mold closing driving mechanism for driving the upper mold frame 10A to move towards the lower mold 13B; the separating mechanism is arranged on the upper mold frame 10A, and the separating mechanism includes an inserting sheet group 1A for separating the die sheets 4A for primary wave forming, an inserting sheet mounting frame 2A for mounting the inserting sheet group 1A, and an inserting sheet driving mechanism for driving the inserting sheet group 1A to move towards the pipe blank; the inserting sheet group 1A includes a plurality of inserting sheets, one ends of the plurality of inserting sheets are mounted on the inserting sheet mounting frame 2A, and the other ends extend towards the lower mold 13B, and the lengths of the plurality of inserting sheets decrease in sequence from the center of the mold to the outside of the mold;

[0070] The mold clamping mechanism B includes a mold clamping plate 1B for clamping the upper mold 12B and the lower mold 13B, and a mold clamping drive mechanism for driving the mold clamping plate 1B to move towards the mold clamping part 3B on the mold;

[0071] The diaphragm pushing device C includes a diaphragm push rod module for pushing the diaphragm 4A to move, a plugging module for plugging the inner cavity of the pipe fitting, a drive mechanism 9C for driving the diaphragm push rod module and the plugging module to move, and a support frame for supporting the drive mechanism.

[0072] See Figures 2 - 5 , the insert mounting frame 2A is arranged above the mold, the upper ends of a plurality of the inserts are mounted on the insert mounting frame 2A, and the lower ends extend towards the mold. In this way, when the insert drive mechanism drives the insert group 1A to move downwards, the insert group 1A is inserted between adjacent diaphragms 4A, so as to separate the diaphragms 4A, and the initial wave forming of the tube blank is realized.

[0073] See Figures 2 - 5 , the insert includes a mounting part for connecting with the insert mounting frame 2A and a guiding part for conveniently separating the diaphragms 4A, and the size of the guiding part gradually decreases from top to bottom, so as to form a conical structure. The guiding part is set as a conical structure. When the insert drive mechanism drives the insert group 1 to move towards the mold, the guiding part of the conical structure is convenient for inserting into the gap between adjacent diaphragms 4A, so as to conveniently separate the adjacent diaphragms 4A.

[0074] See Figures 2 - 5 , the insert group 1A includes a right insert group 1-1A arranged on the right side of the tube blank and a left insert group 1-2A arranged on the left side of the tube blank. With the above insert group 1A arranged, when the insert drive mechanism drives the insert group 1A to move downwards, the right insert group 1-1A and the left insert group 1-2A are inserted into the diaphragms 4A, and respectively separate the diaphragms 4A towards both ends of the tube blank, so as to form corrugations on both sides of the tube blank, and the shape of the tube blank itself is reserved in the middle of the tube blank.

[0075] See Figures 2 - 5 , the right insert group 1-1A includes a right front insert group arranged on the front side of the tube blank and a right rear insert group arranged on the rear side of the tube blank; the left insert group 1-2A includes a left front insert group arranged on the front side of the tube blank and a left rear insert group arranged on the rear side of the tube blank. With the insert group 1A with the above structure arranged, the right front insert group and the right rear insert group are symmetric front and back, the left front insert group and the left rear insert group are symmetric front and back. When the insert drive mechanism drives the insert group 1 to move downwards to separate the diaphragms 4A, the symmetrically arranged insert group 1A enables the diaphragms 4A to be evenly stressed and is convenient for separation.

[0076] See Figures 2 - 5, the insert mounting bracket 2A includes an insert mounting plate 5A and a connecting bracket 6A for mounting the insert mounting plate 5A. The upper end of the insert mounting plate 5A is connected to the connecting bracket 6A, and the lower end is connected to the mounting portion of the insert. By providing the insert mounting bracket 2A with the above structure, the insert driving mechanism can drive the insert group 1A by driving the movement of the insert mounting bracket 2A, thereby separating the die pieces 4A.

[0077] See Figures 2 - 5 , there are two insert mounting plates 5A, one of which is mounted on the front side of the connecting bracket 6A and the other is mounted on the rear side of the connecting bracket 6A. In this way, the left front insert group and the right front insert group are mounted on the insert mounting plate 5A located on the front side, and the left rear insert group and the right rear insert group are mounted on the insert mounting plate 5A located on the rear side. The insert mounting plates 5A respectively mounted on the front and rear sides make the force on the front and rear of the connecting bracket 6A more balanced. When the insert driving mechanism drives the insert group 1A to move downward, the connecting bracket 6A with balanced force makes the whole structure more stable and reliable.

[0078] See Figures 2 - 5 , the insert driving mechanism includes an insert driving element and a driving bracket for mounting the driving element. The driving bracket includes a connecting column 7A and a mounting table 8A mounted on the connecting column 7A. The mounting table 8A is located above the connecting bracket 6A. The connecting column 7A penetrates the connecting bracket 6A, and an avoidance hole for avoiding the connecting column 7A is provided on the connecting bracket 6A.

[0079] See Figures 2 - 5 , the insert driving element includes an insert driving oil cylinder 9A. The cylinder barrel of the insert driving oil cylinder 9A is mounted on the mounting table 8A, and the piston rod of the insert driving oil cylinder 9A is connected to the connecting bracket 6.

[0080] See Figures 6 - 7 , further includes a mold closing mechanism, which is used for mounting the upper mold holder 10A of the die piece 4 and a mold closing driving mechanism for driving the upper mold holder 10A to move in the direction of the lower mold holder 11A. The molding machine is arranged on the upper mold holder 10A.

[0081] See Figures 6 - 7, the mold clamping drive mechanism includes a drive member 15A. The drive member 15A includes a fixed portion and a movable portion that is movable relative to the fixed portion. The fixed portion is mounted on the mold frame 14A, and one end of the movable portion is connected to the upper mold frame 10A. By providing the above mold clamping drive mechanism, when the drive member 15A operates, the movable portion can move relative to the fixed portion, and the fixed portion is fixedly mounted on the mold frame 14A, so that the movable portion drives the upper mold frame 10A to move. When the movable portion drives the upper mold frame 10A to move in the direction of the lower mold frame 11A, the mold clamping action is completed; when the movable portion drives the upper mold frame 10A to move away from the lower mold frame 11A, the mold opening action is completed.

[0082] See Figures 6 - 7 , the drive member 15A is a mold clamping oil cylinder. The cylinder barrel of the mold clamping oil cylinder constitutes the fixed portion, and the piston rod constitutes the movable portion.

[0083] See Figures 6 - 7 , it further includes a guiding mechanism for guiding the movement of the upper mold frame 10A. The guiding mechanism includes a guide rod 12A provided on the mold frame 14A and a guide sleeve 13A that matches the guide rod 12A. The guide sleeve 13A is mounted on the upper mold frame 10A. By providing the above guiding mechanism, when the mold is clamped or opened, the upper mold frame 10A can move along the guide rod 12A, increasing the smoothness of the movement of the upper mold frame 10A and improving the stability of the equipment.

[0084] See Figures 8 - 13 , the locking template 1B includes a mold locking groove 2B. The mold locking groove 2B includes an upper locking surface and a lower locking surface. When the locking plate locks the upper mold 12B and the lower mold 13B after mold clamping, the upper locking surface abuts against the outer end surface 3-1B of the mold clamping portion 3B of the upper mold 12B, and the lower locking surface abuts against the outer end surface 3-1B of the mold clamping portion 3B of the lower mold 13B.

[0085] See Figures 8 - 13 , there are two locking templates 1B. The two locking templates 1B are respectively arranged on the front side and the rear side of the mold, and the mold locking groove 2B is arranged on the inner side of the locking template 1B. By providing the locking template 1B with the above structure, after the upper mold 12B and the lower mold 13B are clamped, the mold locking drive mechanism drives the locking template 1B to move towards the center of the mold, so that the mold locking grooves 2B on the front and rear locking templates 1B respectively clamp on the mold clamping portion 3B, thereby locking the mold clamping portions 3B on both sides of the upper mold 12B and the lower mold 13B.

[0086] See Figures 8 - 13, both ends of the locking template 1B are slidably connected to the mold frame 14A. In this way, when the mold clamping drive mechanism drives the locking template 1B to move, the locking template 1B can slide back and forth relative to the mold frame 14A, so that it is convenient to move towards the mold direction to clamp the upper mold 12B and the lower mold 13B during mold clamping, and it is convenient to move away from the mold direction to release the clamped state during mold opening.

[0087] See Figures 8 - 13 , both ends of the locking template 1B are connected to the mold frame 14A through a sliding mechanism. The sliding mechanism includes sliders 5B installed at both ends of the locking template 1B and slide rails 6B matching the sliders 5B. The slide rails 6B are installed on the mold frame 14A, and the length direction of the slide rails 6B is arranged along the front-back direction of the mold. By setting the above sliding mechanism, since the length direction of the slide rails 6B is arranged along the front-back direction of the mold, the matching sliders 5B can slide along the length direction of the slide rails 6B, that is, along the front-back direction of the mold. At the same time, since the sliders 5B are installed at both ends of the locking template 1B, the locking template 1B can slide in the front-back direction of the mold.

[0088] See Figures 8 - 13 , the slider 5B includes an upper slider 5-1B installed above the locking template 1B and a lower slider 5-2B installed below the locking template 1B. The slide rail 6B includes an upper slide rail 6-1B matching the upper slider 5-1B and a lower slide rail 6-2B matching the lower slider 5-2B. By setting the sliding mechanism with the above structure, the upper top surface of the upper slider 5-1B matches the lower bottom surface of the upper slide rail 6-1B, and the lower bottom surface of the lower slider matches the upper top surface of the lower slide rail 6-2B. That is, the upper slider 5-1B, the locking template 1B, and the lower slider are arranged in the chute formed by the upper slide rail 6-1B and the lower slide rail 6-2B, thus ensuring that the locking template 1B can accurately slide in the front-back direction of the mold.

[0089] See Figures 8 - 13 , it further includes gaskets. The gaskets include an upper gasket 7B arranged above the mold clamping groove 2B and a lower gasket 8B arranged below the mold clamping groove 2B. The bottom surface of the upper gasket 7B constitutes the upper locking surface, and the top surface of the lower gasket 8B constitutes the lower locking surface. By setting gaskets in the mold clamping groove 2B, when the mold clamping groove 2B clamps the upper mold 12B and the lower mold 13B after mold clamping, the bottom surface of the upper gasket 7B abuts against the outer end surface 3-1B of the mold clamping part 3B of the upper mold 12B, and the top surface of the lower gasket 8B abuts against the outer end surface 3-1B of the mold clamping part 3B of the lower mold 13B. In this way, the setting of the gaskets avoids the rigid contact between the lower mold 13B and the upper mold 12B and the locking template 1B, plays a buffering role, and protects both the mold and the locking template 1B.

[0090] See Figures 8 - 13, further including a left stopper 9B arranged at the left end inside the mold clamping groove 2B and a right stopper 10B arranged at the right end inside the mold clamping groove 2B. When clamping the mold and releasing the clamping in the mold clamping groove 2B, the above-mentioned left stopper 9B and right stopper 10B can reduce the shear force on the upper and lower gasket fixing screws when the diaphragm 4A slides left and right, thereby playing a protective role for the mold and the upper and lower gaskets.

[0091] See Figures 8 - 13 , the mold clamping drive mechanism includes a driving member 11B, the driving member 11B includes a fixed part and a movable part that can slide back and forth relative to the fixed part, the fixed part is installed on the mold frame 14A, and the end of the movable part is connected to the mold clamping plate 1B. By setting the above-mentioned mold clamping drive mechanism, when the driving member 11B is started, the movable part can slide relative to the fixed part. Since the fixed part is installed on the mold frame 14A and the movable part is connected to the mold clamping plate 1B, the movement of the driving member 11B enables the mold clamping plate 1B to slide relative to the mold frame along the front and back directions.

[0092] See Figures 8 - 13 , the driving member 11B is a mold clamping oil cylinder, the cylinder barrel of the mold clamping oil cylinder constitutes the fixed part, and the piston rod of the mold clamping oil cylinder constitutes the movable part. Setting the driving member 11B as an oil cylinder not only has a low manufacturing cost but also has a continuous and stable driving force.

[0093] See Figures 8 - 13 , the piston rod of the mold clamping oil cylinder is connected to the mold clamping plate 1B through a connecting block. The connecting block includes a connecting part for connecting with the piston rod and an installation part for fixedly connecting with the mold clamping plate 1B; a threaded hole for connecting with the piston rod is provided on the connecting part, and a screw through hole for connecting with the mold clamping plate 1B is provided on the installation part. By setting the above-mentioned connecting plate, tightening the threaded hole with the piston rod can realize the connection between the connecting block and the piston rod; passing the screw through the screw through hole on the installation part and locking it on the mold clamping plate 1B can realize the fixed connection between the connecting block and the mold clamping plate 1B.

[0094] See Figures 14 - 17, the support frame includes several support rods 1C and a support plate 2C connected to the support rods 1C. One end of the support rod 1C is connected to the mold frame 14A, and the other end extends outward and is fixedly connected to the support plate 2C; the die slice push rod module includes a push sleeve 4C, a push member 5C provided at the front end of the push sleeve 4C, and a push bottom plate 6C provided at the rear end of the push sleeve 4C. The push bottom plate 6C is slidably connected to several support rods 1C, and the push sleeve 4C is slidably connected to the mold frame 14A; the plugging module includes a plugging connecting rod 7C and a plugging head 8C provided at the front end of the plugging connecting rod 7C. The plugging connecting rod 7C is sleeved inside the push sleeve 4C; the driving mechanism 9C includes a fixing member 9-1C and an executing member 9-2C. The fixing member 9-1C is installed on the support plate 2C, and the executing member 9-2C is connected to the push bottom plate 6C and the plugging connecting rod 7C through a connecting component 10C.

[0095] See Figures 14 - 17 , the connecting component 10C includes a first connecting module connected to the push bottom plate 6C and a second connecting module connected to the plugging connecting rod 7C. Among them, the first connecting module includes a front connecting frame 11C and a rear connecting frame 12C. The rear connecting frame 12C is connected to the executing member 9-2C, and the front connecting frame 11C is connected to the push bottom plate 6C; the second connecting module includes a second driving mechanism. The second driving mechanism includes a fixing part 13C and a movable part 14C that can slide back and forth relative to the fixing part 13C. The fixing part 13C is provided on the rear connecting frame 12C, and the movable part 14C is connected to the plugging connecting rod 7C. By setting the above connecting component 10C, when the driving mechanism 9C acts and the executing member 9-2C pushes forward, the executing member 9-2C acts on the rear connecting frame 12C, so that the first connecting module advances forward, thereby driving the push bottom plate 6C to move forward. In this way, the push member 5C connected to the push bottom plate 6C through the push sleeve 4C moves forward, so as to push the die slices to fit together; at the same time, when the rear connecting frame 12C moves forward, since the fixing part 13C of the second driving mechanism is provided on the rear connecting frame 12C, the plugging connecting rod 7C connected to the fixing part 13C through the movable part 14C moves forward accordingly. At this time, if the second driving mechanism acts, the movable part 14C will continue to move forward, that is, continue to push the plugging connecting rod 7C forward, so that the plugging head 8C installed at the front end of the plugging connecting rod 7C continues to move forward into the pipe fitting to play a plugging role for the pipe fitting.

[0096] See Figures 14 - 17, the rear connecting frame 12C includes a first connecting plate 12-1C, a second connecting plate 12-2C, and a plurality of rear connecting rods 12-3C disposed between the first connecting plate 12-1C and the second connecting plate 12-2C; the first connecting plate 12-1C is connected to the actuator 9-2C through a connecting cylinder, the connecting cylinder is fixedly connected to the first connecting plate 12-1C, and is clamped on the actuator 9-2C. The first connecting plate 12-1C and the second connecting plate 12-2C are connected into a whole by a plurality of rear connecting rods 12-3C, so that the rear connecting frame 12C is firmly and reliably connected.

[0097] See Figures 14 - 17 , the front connecting frame 11C includes a third connecting plate 11-1C, a fourth connecting plate 11-2C, and a plurality of front connecting rods 11-3C disposed between the third connecting plate 11-1C and the fourth connecting plate 11-2C; the fourth connecting plate 11-2C is connected to the second connecting plate 12-2C, and the fourth connecting plate 11-2C is connected to the pushing bottom plate 6C. The third connecting plate 11-1C and the fourth connecting plate 11-2C are connected into a whole by a plurality of front connecting rods 11-3C, so that the front connecting frame 11C is firmly and reliably connected.

[0098] See Figures 14 - 17 , the second driving mechanism is an oil cylinder, the cylinder barrel of the oil cylinder constitutes the fixed part 13C, and the piston rod of the oil cylinder constitutes the movable part 14C.

[0099] See Figures 14 - 17 , further includes a strengthening bracket module, the strengthening bracket module includes a strengthening frame 15C disposed on the die rack 14A and a sliding mechanism disposed on the strengthening frame 15C, the sliding mechanism includes a slider 16C and a slide rail 17C matching with the slider 16C, the length direction of the slide rail 17C is arranged along the axis direction of the support rod 1C; the upper top surface of the slider 16C is connected to the bottom of the pushing bottom plate 6C. By providing the above strengthening bracket module, since the top of the slider 16C is connected to the bottom of the pushing bottom plate 6C, the slider 16C can slide along with the pushing bottom plate 6C. Therefore, the strengthening bracket has a supporting effect on the pushing bottom plate 6C during the whole sliding process through the sliding mechanism, further improving the stability and reliability of the pushing bottom plate 6C during the movement process.

[0100] See Figures 14 - 17, the reinforcing frame 15C includes a reinforcing mounting plate 15-1C, a reinforcing support plate 15-2C, and a reinforcing rib plate 15-3C. One end of the reinforcing mounting plate 15-1C is connected to one end of the reinforcing support plate 15-2C to form an L-shaped structure. The reinforcing rib plate 15-3C is disposed between the reinforcing mounting plate 15-1C and the reinforcing support plate 15-2C. The reinforcing mounting plate 15-1C is mounted on the mold frame 14A; the slide rail 17C is mounted on the reinforcing support plate 15-2C. By providing the reinforcing frame 15C with the above structure and arranging the reinforcing rib plate 15-3C between the reinforcing mounting plate 15-1C and the reinforcing support plate 15-2C, the entire reinforcing frame 15C is more firmly connected and plays a reliable supporting role for the pushing bottom plate 6C.

[0101] See Figures 14 - 17 , there are four support rods 1C, and the four support rods 1C are symmetrically distributed on the support plate 2C. By providing the above support rods 1C, the four corners of the support plate 2C are all connected to the support rods 1C, so that the support plate 2C can be stably connected to the support rods 1C.

[0102] See Figures 14 - 17 , the support rod 1C is slidably connected to the pushing bottom plate 6C through a lubricating sleeve. In this way, by providing a lubricating sleeve between the pushing bottom plate 6C and the support rod 1C, not only can the sliding of the pushing bottom plate 6C relative to the support rod 1C be made smoother, but also the service life of the pushing bottom plate 6C can be improved through the protective effect of the lubricating sleeve on the pushing bottom plate 6C.

[0103] See Figures 14 - 17 , the pushing member 5C includes a connecting sleeve and a push block provided at the front end of the connecting sleeve. The rear end of the connecting sleeve is fixedly connected to the front end of the pushing sleeve 4C; avoidance holes for avoiding the plug head 8C are provided in both the push block and the connecting sleeve. By providing the above pushing member 5C, when the pushing sleeve 4C advances, the connecting sleeve at the front end of the pushing sleeve 4C follows to advance, so that the push block pushes the die piece forward.

[0104] See Figures 14 - 17 , the driving mechanism 9C is a driving oil cylinder. The cylinder barrel of the driving oil cylinder constitutes the fixing member 9-1C, and the piston rod of the driving oil cylinder constitutes the executing member 9-2C.

[0105] See Figures 14 - 17, a through hole for introducing pressurized liquid is provided inside the plugging connecting rod 7C. One end of the through hole communicates with the liquid through hole of the plugging head 8C, and the other end is communicated with the liquid supply mechanism through a pipeline. By providing the above-mentioned plugging connecting rod 7C, when the liquid supply mechanism operates, the pressurized liquid enters the through hole of the plugging connecting rod 7C through the pipeline. Since the through hole communicates with the liquid through hole of the plugging head 8C, in this way, the hydraulic liquid enters the liquid through hole of the plugging head 8C and finally enters the inner cavity of the pipe fitting, performing pressure bulging on the pipe fitting, and finally forming a corrugated pipe in the mold.

[0106] See 18- Figure 21 , the diaphragm includes a diaphragm body provided with a guide post hole 1D and a guide rod hole 2D, and a mold clamping part provided on both sides of the diaphragm body. Among them, the diaphragm body includes a mold closing part 3D with one end being a plane and a connecting part 4D arranged on the mold closing part 3D in a trapezoidal structure; a guide groove 6D for accommodating a guide piece 5D is provided on the mold closing part 3D, a semicircular accommodating hole 7D for matching the outer diameter of the pipe fitting is provided at the center of the mold closing part 3D, and semi-circular forming cavities 8 are provided on the front and back sides of the accommodating hole 7D; the mold clamping part includes a mold clamping section 9D and a guide section 10D, and chamfered inclined surfaces 11D are provided on both sides of the guide section 10D.

[0107] See 18- Figure 21 , there are multiple groups of the guide rod holes 2D. Each group of the guide rod holes 2D includes two guide rod holes 2D. Among the two guide rod holes 2D, a spring counterbore 12D for installing a spring is provided at one end of one of the guide rod holes 2D, and a spring counterbore 12D for installing a spring is provided at the other end of the other guide rod hole 2D. By providing the guide rod holes 2D with the above structure, the guide rod holes 2D are matched with the guide rods, and the spring is sleeved on the guide rod and matched with the spring counterbore 12D. Since the spring counterbores 12D are respectively arranged on both sides of the diaphragm body in a group of guide rod holes 2D, two springs respectively act on adjacent sides of the diaphragm with an elastic force. When it is necessary to separate the diaphragm when forming a corrugated pipe, the elastic force makes the adjacent two diaphragms separate slowly.

[0108] See 18- Figure 21 , there are four groups of the guide rod holes 2D, and the four groups of the guide rod holes 2D are distributed at the four corners of the diaphragm body. By providing the above four groups of guide rod holes 2D, in this way, when the diaphragm body is respectively sleeved on four groups of guide rods, correspondingly, there are also four groups of springs. In this way, not only the stability of the diaphragm is increased, but also the number of springs is increased, making the elastic force more sufficient when the diaphragm is separated and facilitating the separation of the diaphragm.

[0109] See 18- Figure 21, there are two guide pin holes 1D, and the two guide pin holes 1D are symmetrically arranged on the diaphragm body. By providing two guide pin holes 1D, when pushing adjacent diaphragms together or separating adjacent diaphragms, each diaphragm moves along two guide posts, ensuring that the diaphragm remains balanced during sliding and the structure is more stable.

[0110] See 18- Figure 21 , chamfered inclined surfaces 11D are provided on both the top and bottom surfaces of the guiding section 10D. With the above-mentioned guiding section 10D provided, when the inserting piece separates the diaphragms, the inserting piece separates the diaphragms on both the lower die and the upper die simultaneously, that is, the inserting piece penetrates through the lower die and the upper die. For example, when the inserting piece enters from the upper die, at this time, the chamfered inclined surface 11D on the top surface of the guiding section 10D plays a guiding role, enabling the inserting piece to easily enter the diaphragm of the upper die and separate the adjacent diaphragms of the upper die; when the inserting piece continues to insert into the lower die, the chamfered inclined surface 11D located on the bottom surface of the guiding section 10D of the lower die piece plays a guiding role, enabling the inserting piece to easily enter the diaphragm of the lower die and separate the adjacent diaphragms of the lower die.

[0111] See 18- Figure 21 , the top of the mold clamping section 9D is lower than the top of the guiding section 10D. With the mold clamping section 9D having the above-mentioned structure, during mold closing, the fixed mold of the mold clamping section 9D is lower than the top of the guiding section 10D, such that the distance between the top of the mold clamping section 9D on the upper die and the top of the mold clamping section 9D on the lower die is smaller. In this way, the size of the locking mechanism for locking the lower die and the upper die can be made smaller, saving space and making the entire mechanism more compact.

[0112] See 18- Figure 21 , there are two guiding grooves 6D, and the two guiding grooves 6D are arranged on both sides of the accommodating hole 7D. By providing two guiding grooves 6D, during the mold closing process, the guiding pieces 5D on both sides guide the diaphragms respectively, further improving the accuracy of mold closing.

[0113] See Figures 18 - 21 , a pin hole for locking the guiding piece 5D is provided at the position of the guiding groove 6D, and the pin hole penetrates through the diaphragm body. With the above-mentioned pin hole provided, after installing the guiding piece 5D onto the guiding groove 6D, a pin is passed through the pin hole and matched with the pin hole on the guiding piece 5D, thereby locking the guiding piece 5D on the diaphragm.

[0114] See Figures 1 - 21 , the working principle of the above-mentioned corrugated pipe hydroforming machine is:

[0115] See Figures 1 - 21 , the working principle of the above-mentioned corrugated pipe hydroforming machine is:

[0116] The forming die of the corrugated pipe consists of several die pieces 4A. The forming of the corrugated pipe is divided into two processes. The first process is the initial wave forming stage. In this stage, two adjacent die pieces 4A are separated by spacers at a fixed interval. The second process is the final forming stage. In this stage, two adjacent die pieces 4A are closely attached, and the final shape of the waveform is controlled by the die cavities of two adjacent die pieces 4A. The specific process of one implementation method from the initial wave forming to the final forming is as follows: First, after the previous corrugated pipe is deformed in the final forming stage, the push head used to push the die pieces 4A to fit together is withdrawn. After the push head is withdrawn, the thrust on the die piece group is released, and the spring in the die piece 4A gives a elastic force to two adjacent die pieces 4A, thus pushing the two adjacent die pieces 4A apart by a certain gap to facilitate the entry of the spacer. At this time, the lower die 13B descends a certain distance, and the upper die 12B ascends a certain distance to facilitate taking out the deformed corrugated pipe. Then, the pipe blank is hung on the plug head so that the center line of the pipe blank coincides with the center line of the plug head. The die piece pushing device C is started. Specifically, the driving mechanism 9C acts, causing the plugging module to move towards the center of the mold, plugging the plug head, finally playing a role in plugging the inner cavity of the pipe fitting, and causing the lower die 13B to ascend and reach the limit position. Then, the mold closing and separating mechanism A is started. Specifically, the spacer driving mechanism acts, driving the spacer group to move towards the mold. Since the extension ends of multiple spacers are successively increased in distance from the pipe blank along the direction from the middle to the end of the pipe blank, the spacer located in the middle of the pipe blank is the longest and first enters the gap between adjacent die pieces, and pushes the middle die piece 4A towards the end of the pipe blank. Then, the spacer driving mechanism continues to act, driving the spacer group to continue to move towards the lower die 13B and inserting between two adjacent die pieces, thus successively separating the die pieces 4A towards the end of the pipe blank and separating them from each other at the width distance of the spacers. When the spacer driving mechanism descends to the limit position, the upper die and the spacer group descend to the limit position. Next, the mold locking mechanism B is started. The mold locking driving mechanism acts, driving the mold locking plate 1B to move towards the mold closing part 3B on the mold, mechanically locking the upper die 12B and the lower die 13B. Next, after the die pieces 4A are separated, a pressure medium is introduced, causing the pipe blank to deform outwards between two adjacent die pieces to complete the initial wave forming. Then, the spacer driving mechanism acts, causing the spacer group to move upwards, thus withdrawing the spacer group from the die pieces 4A. Then, the die piece pushing device C is started continuously, causing the die piece push rod module to move towards the center of the mold, thus successively pushing the outer die pieces 4A towards the center of the mold. At this time, a constant pressure is maintained inside the pipe fitting, and finally causing two adjacent die pieces 4A to fit together. Under the action of the high-pressure medium, the initial wave forms the final waveform in the die cavities of two adjacent die pieces 4A.

[0117] The above are the preferred embodiments of the present invention. However, the embodiments of the present invention are not limited to the above content. Any other changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A corrugated pipe hydroforming machine, characterized in that It includes a mold body, a mold closing and separating mechanism, a mold locking mechanism, and a diaphragm pushing device, where: The mold body includes a lower mold and an upper mold arranged oppositely, and both the lower mold and the upper mold include a plurality of diaphragms; The mold closing and separating mechanism includes a separating mechanism, an upper mold frame for mounting the diaphragms of the upper mold, and a mold closing drive mechanism for driving the upper mold frame to move towards the lower mold; the separating mechanism is arranged on the upper mold frame, and the separating mechanism includes an insert group for separating the diaphragms for primary wave forming, an insert mounting frame for mounting the insert group, and an insert drive mechanism for driving the insert group to move towards the tube blank; the insert group includes a plurality of inserts, one ends of the plurality of inserts are mounted on the insert mounting frame, and the other ends extend towards the lower mold, and the lengths of the plurality of inserts decrease sequentially from the center of the mold towards the outside of the mold; The mold locking mechanism includes a lock template for locking the upper mold and the lower mold, and a mold locking drive mechanism for driving the lock template to move towards the mold closing part on the mold; The diaphragm pushing device includes a diaphragm push rod module for pushing the diaphragm to move, a plugging module for plugging the inner cavity of the pipe fitting, a drive mechanism for driving the diaphragm push rod module and the plugging module to move, and a support frame for supporting the drive mechanism; among them, the support frame includes several support rods and a support plate connected to the support rods, one ends of the support rods are connected to the mold frame, and the other ends extend outwards and are fixedly connected to the support plate; the diaphragm push rod module includes a push sleeve, a pushing member arranged at the front end of the push sleeve, and a push bottom plate arranged at the rear end of the push sleeve, and the push bottom plate is slidably connected to several support rods, and the push sleeve is slidably connected to the mold side plate; the plugging module includes a plugging connecting rod and a plugging head arranged at the front end of the plugging connecting rod, and the plugging connecting rod is sleeved inside the push sleeve; the drive mechanism includes a fixing member and an executing member, the fixing member is mounted on the support plate, and the executing member is connected to the push bottom plate and the plugging connecting rod through a connecting component; the connecting component includes a first connecting module connected to the push bottom plate and a second connecting module connected to the plugging connecting rod, where the first connecting module includes a front connecting frame and a rear connecting frame, the rear connecting frame is connected to the executing member, and the front connecting frame is connected to the push bottom plate; the second connecting module includes a second drive mechanism, and the second drive mechanism includes a fixing part and a movable part capable of sliding back and forth relative to the fixing part, the fixing part is arranged on the rear connecting frame, and the movable part is connected to the plugging connecting rod.

2. The bellows hydroforming machine according to claim 1, wherein, The lock template includes a mold locking groove, and the mold locking groove includes an upper locking surface and a lower locking surface. When the lock plate locks the upper mold and the lower mold after mold closing, the upper locking surface abuts against the outer end surface of the mold closing part of the upper mold, and the lower locking surface abuts against the outer end surface of the mold closing part of the lower mold.

3. The bellows hydroforming machine according to claim 1, characterized in that, The insert mounting frame is arranged above the mold. The upper ends of multiple inserts are mounted on the insert mounting frame, and the lower ends extend towards the mold. The insert includes a mounting portion for connecting with the insert mounting frame and a guiding portion for facilitating the separation of the die pieces. The size of the guiding portion gradually decreases from top to bottom, thus forming a conical structure.

4. A corrugated pipe hydroforming machine according to claim 2, characterized in that, There are two locking templates, which are respectively arranged on the front side and the rear side of the mold, and the locking grooves are arranged on the inner sides of the locking templates.

5. A corrugated pipe hydroforming machine according to claim 4, characterized in that, Both ends of the locking template are connected to the mold frame through a sliding mechanism. The sliding mechanism includes sliders mounted at both ends of the locking template and slide rails matching the sliders. The slide rails are mounted on the mold frame, and the length direction of the slide rails is arranged along the front-rear direction of the mold.

6. The bellows hydroforming machine according to claim 1, characterized in that, The rear connecting frame includes a first connecting plate, a second connecting plate, and multiple rear connecting rods arranged between the first connecting plate and the second connecting plate. The first connecting plate is connected to the actuator through a connecting cylinder. The connecting cylinder is fixedly connected to the first connecting plate and is clamped on the actuator.

7. A corrugated pipe hydroforming machine according to claim 6, characterized in that, The front connecting frame includes a third connecting plate, a fourth connecting plate, and multiple front connecting rods arranged between the third connecting plate and the fourth connecting plate. The fourth connecting plate is connected to the second connecting plate, and the fourth connecting plate is connected to the pushing bottom plate.

8. A corrugated pipe hydroforming machine according to claim 1, characterized in that, The die piece includes a die piece body provided with a guide post hole and a guide rod hole, and locking portions arranged on both sides of the die piece body. Among them, the die piece body includes a mold closing portion with one end being a plane and a connecting portion arranged on the mold closing portion in a trapezoidal structure. A guide groove for accommodating a guide piece is provided on the mold closing portion, and a semi-circular accommodating hole for matching with the outer diameter of the pipe fitting is provided at the center of the mold closing portion. Semi-circular forming cavities are provided on both the front and rear sides of the accommodating hole. The locking portion includes a locking section and a guiding section, and chamfered inclined surfaces are provided on both sides of the guiding section.

Images