Corrugated pipe water expansion forming mold structure and equipment

Abstract

The utility model discloses a corrugated pipe water expansion forming mold structure and equipment. The mold structure comprises a plurality of mold pieces, a piece arranging structure and a positioning structure, wherein the piece arranging structure is used for arranging the mold pieces at intervals, and the positioning structure is used for positioning the arranged mold pieces. In the arrangement moving direction of the mold pieces, the two side faces of each mold piece are each provided with a piece arrangement avoiding groove; the sizes of the sheet arrangement avoiding grooves of the multiple mold sheets are sequentially reduced in the arrangement moving direction; the sheet arranging structure is two sheet arranging plates which are respectively positioned on the two sides of the mold sheet; one end of the sheet arranging plate is connected with the mold core, the other end of the sheet arranging plate is provided with a sheet arranging step structure, the sheet arranging step structure comprises a plurality of sheet arranging steps, and the plurality of sheet arranging steps are respectively matched with the sheet arranging avoiding grooves of the plurality of mold sheets. According to the utility model, each die sheet can be controlled to move independently, error accumulation is avoided, errors can be reduced, and the precision of the corrugated pipe is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a corrugated pipe processing device, concretely relates to a corrugated pipe water swelling forming die structure and equipment. BACKGROUND

[0002] Metal corrugated pipe is a kind of tubular part with continuous corrugated special-shaped section, and is an important component of corrugated pipe assembly.Due to special structure, it has functions superior to straight-wall pipe fittings or metal hoses in connection, sealing, shock absorption and the like.The forming technology of metal corrugated pipe is various, and the hydraulic forming technology is widely applied in the field of corrugated pipe forming;especially for the production of medium-diameter and small-diameter thin-walled corrugated pipes, hydraulic forming occupies a large market share;the corrugated pipe hydraulic forming technology is a typical application of modern hydraulic forming in pipe forming.

[0003] The existing corrugated pipe is mainly made by internal high-pressure water swelling forming machine, and the pipe material is placed into the forming die with corrugated pipe die sheet first, and the pipe material is radially expanded under the action of liquid pressure in the pipe, according to the metal forming principle, the volume of metal does not change in the plastic forming process, and the material required for the radial expansion of the corrugated pipe is supplemented by the axial shortening of the pipe material, so that the pipe material is formed by moving the corrugated pipe die sheet in the axial direction, for example, the corrugated pipe die sheet structure applied to the water swelling forming machine disclosed in the utility model patent with the authorization announcement No.CN207447035U.

[0004] The corrugated pipe die sheet structure has the following disadvantages:

[0005] Since the adjacent two die sheets can slide relative to each other and are provided with sliding limiting mechanisms therebetween, that is, the die sheets are in series, in the pulling operation, the next die sheet is moved by the previous die sheet, forming a chain reaction, although the structure is relatively simple, but since each die sheet is not independently moved, but depends on the previous die sheet, therefore, the error of each die sheet is accumulated, resulting in too large error, and it is difficult to improve the precision of the corrugated pipe. UTILITY MODEL CONTENTS

[0006] The utility model aims at overcoming the above-mentioned problems, and provides a corrugated pipe water swelling forming die structure, which can control the independent movement of each die sheet, avoid error accumulation, and is beneficial to reducing error and improving the precision of the corrugated pipe.

[0007] Another object of the utility model is to provide a corrugated pipe water swelling forming equipment.

[0008] The object of the utility model is realized by the following technical scheme:

[0009] The utility model provides a corrugated pipe water rises forming die structure, is equipped with two groups and each group includes a plurality of die pieces, is used for respectively spacingly arranging a plurality of die pieces piece arranging structure and is used for positioning the die piece after arranging positioning structure.

[0010] One preferred scheme of the utility model, wherein, in the direction of die piece arranging movement, both sides of the die piece are equipped with piece arranging avoiding groove;Along the direction of arranging movement, the size of the piece arranging avoiding groove of a plurality of die pieces is reduced gradually;

[0011] The piece arranging structure is piece arranging board, and the piece arranging board is equipped with two and is located two sides of the die piece respectively;One end of the piece arranging board is connected with the die core, and the other end of the piece arranging board is equipped with piece arranging step structure, and the piece arranging step structure includes a plurality of piece arranging steps, and the plurality of piece arranging steps are matched with the piece arranging avoiding groove of a plurality of die pieces respectively;In the arranging state, a plurality of piece arranging steps are located in the piece arranging avoiding groove of a plurality of die pieces respectively, and the gap between adjacent two die pieces is piece arranging gap.

[0012] Further, in the direction of arranging movement, both sides of the die piece are equipped with positioning boss, and the positioning boss is transversely protruding and the protruding direction thereof is perpendicular to the direction of arranging movement;Along the direction of arranging movement, the protruding size of the positioning boss of a plurality of die pieces is reduced gradually;

[0013] The same group positioning structure includes two positioning plates, and the two positioning plates are located two sides of the die piece respectively;The positioning plate is equipped with positioning step structure, and the positioning step structure includes a plurality of positioning steps, and the plurality of positioning steps are matched with the positioning boss of a plurality of die pieces respectively;In the arranging state, a plurality of positioning bosses are located on a plurality of positioning steps respectively.

[0014] Through the above structure, in the process of closing forming, under the driving of forming driving mechanism, the movable die core moves close to the die piece in the direction opposite to the direction of arranging movement and drives the piece arranging board to move synchronously;Through the movable die core, a plurality of die pieces are closely adhered together gradually, thereby the pipe is shaped;At this time, the piece arranging step structure of the piece arranging board is away from the corresponding piece arranging avoiding groove, and the positioning boss of a plurality of die pieces is also away from the corresponding positioning step.In the process of opening, under the driving of forming driving mechanism, the movable die core moves in the direction of arranging movement and drives the piece arranging board to move synchronously;Since along the direction of arranging movement, the size of the piece arranging avoiding groove of a plurality of die pieces is reduced gradually, the step of the piece arranging board at the front end enters the smallest piece arranging avoiding groove and pushes the corresponding die piece to move forward, then other steps enter the corresponding piece arranging avoiding groove and push the corresponding die piece to move forward gradually, at this time, a plurality of die pieces are driven separately by the piece arranging board and are spaced apart, until the positioning boss of a plurality of die pieces is stopped by the corresponding positioning step of the positioning plate, thereby the piece arranging work of a plurality of die pieces is completed.

[0015] Further, each group of mold structure further comprises a mold core, the mold core comprises a movable mold core and a fixed mold core, the movable mold core is connected with the forming driving mechanism, and the movable mold core is connected with one end of the row piece plate.

[0016] In one preferred embodiment of the utility model, the multiple mold pieces of the same group comprise a fixed mold piece in the middle and two movable mold pieces on the two sides of the fixed mold piece, and each movable mold piece comprises multiple movable mold pieces.

[0017] Further, each group of row piece structure comprises four multi-section row piece expansion tubes, and the two sides of each movable mold piece are connected with two multi-section row piece expansion tubes respectively; each multi-section row piece expansion tube comprises multiple expansion tube pieces connected in sequence; along the direction of rowing and moving, the sizes of the multiple expansion tube pieces of the same multi-section row piece expansion tube gradually decrease; and the expansion tube piece with the smallest size is fixedly connected with the mold core.

[0018] The two side wings of the movable mold piece are each provided with a row piece avoiding groove matched with the expansion tube piece, and along the direction of rowing and moving, the sizes of the row piece avoiding grooves of the multiple movable mold pieces of the same group gradually decrease.

[0019] In the rowed state, the multiple expansion tube pieces of the same multi-section row piece expansion tube are located in the row piece avoiding grooves of the multiple movable mold pieces of the same group respectively.

[0020] Further, along the direction of rowing and moving, the two side wings of the movable mold piece are each provided with a positioning avoiding groove, and along the direction of rowing and moving, the sizes of the two side wings of the multiple movable mold pieces of the same group gradually increase.

[0021] The same group of positioning structure comprises two positioning plates, and the two positioning plates are located on the two sides of the mold piece respectively; each positioning plate is provided with two groups of positioning step structures matched with the two groups of movable mold pieces respectively, each group of positioning step structure comprises multiple positioning steps, and the multiple positioning steps are matched with the positioning avoiding grooves of the multiple movable mold pieces of the same group respectively; in the rowed state, the multiple positioning steps of the same positioning plate are located in the positioning avoiding grooves of the multiple movable mold pieces of the same group respectively.

[0022] Further, the same group of positioning structure further comprises a positioning seat and a positioning hook, the positioning seat is provided with two and is fixedly connected on the two side wings of the fixed mold piece, the positioning seat is provided with two positioning grooves on the two sides of the fixed mold piece respectively, the positioning hook is provided with two groups and is fixed on the movable mold piece close to the fixed mold piece respectively, and the positioning hook extends into the corresponding positioning groove.

[0023] Through the above structure, in the mold forming process, under the driving of the forming driving mechanism, the two groups of movable mold cores move to the opposite direction of the moving direction of the spacing respectively, and move close to the mold piece, the movable mold core is tightly attached to the middle fixed mold piece through the movable mold core, so that the pipe is shaped, at the same time, the movable mold core drives the smallest telescopic pipe to retract into the adjacent larger size telescopic pipe, when the movable mold core is close to the movable mold piece, the movable mold piece pushes the next telescopic pipe to retract, until all the mold pieces are tightly attached together.

[0024] In the mold opening process, under the driving of the forming driving mechanism, the two groups of movable mold cores move to the opposite direction of the moving direction of the spacing respectively, and move close to the mold piece, the movable mold core is tightly attached to the middle fixed mold piece through the movable mold core, so that the pipe is shaped, at the same time, the movable mold core drives the smallest telescopic pipe to retract into the adjacent larger size telescopic pipe, when the movable mold core is close to the movable mold piece, the movable mold piece pushes the next telescopic pipe to retract, until all the mold pieces are tightly attached together.

[0025] Further, each group of mold structures further comprises a mold core, the mold core comprises two movable mold cores, and the two movable mold cores are connected with the forming driving mechanism.

[0026] In one preferred embodiment of the utility model, each group of mold structures further comprises two guide columns for guiding the mold pieces.

[0027] A corrugated pipe water expansion forming equipment comprises the corrugated pipe water expansion forming mold structure.

[0028] Compared with the prior art, the utility model has the following beneficial effects:

[0029] The mold structure can control the individual movement of each mold piece, and can separately space the multiple mold pieces, so that the error accumulation is avoided, the error is reduced, and the precision of the corrugated pipe is improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1It is the stereogram schematic view of the first kind of embodiment of the corrugated pipe water swelling forming die structure of the utility model.

[0031] Figure 2 It is the stereogram schematic view of the first kind of embodiment of the die piece, the piece arranging structure and the positioning structure of the corrugated pipe water swelling forming die structure of the utility model, and the arrow in the drawing is the direction of arranging and moving.

[0032] Figure 3 It is the side view of the first kind of embodiment of the die piece, the piece arranging structure and the positioning structure of the corrugated pipe water swelling forming die structure of the utility model, and the arrow in the drawing is the direction of arranging and moving.

[0033] Figure 4 It is the stereogram schematic view of the first kind of embodiment of the die piece and the piece arranging structure of the corrugated pipe water swelling forming die structure of the utility model.

[0034] Figure 5 It is the plan view of the first kind of embodiment of the partial die piece and the positioning structure of the corrugated pipe water swelling forming die structure of the utility model.

[0035] Figure 6 It is the stereogram schematic view of the second kind of embodiment of the corrugated pipe water swelling forming die structure of the utility model.

[0036] Figure 7 It is the plan view of the second kind of embodiment of the die piece and the piece arranging structure of the corrugated pipe water swelling forming die structure of the utility model.

[0037] Figure 8 It is the sectional view of the A-A direction in the corrugated pipe water swelling forming die structure of the utility model. Figure 7 The arrow in the drawing is the direction of arranging and moving.

[0038] Figure 9 It is the plan view of the second kind of embodiment of the partial die piece and the positioning structure of the corrugated pipe water swelling forming die structure of the utility model. DETAILED DESCRIPTION

[0039] In order to make the skilled in the art well understand the technical scheme of the utility model, the utility model is further described below in combination with the embodiment and the drawing, but the embodiment of the utility model is not limited to this.

[0040] Embodiment 1

[0041] Referring to Figure 1 The corrugated pipe water swelling forming equipment of the embodiment comprises a corrugated pipe water swelling forming die structure, the corrugated pipe water swelling forming die structure is provided with two groups, and each group comprises a plurality of die pieces 1, a piece arranging structure for spacingly arranging the plurality of die pieces 1 respectively and a positioning structure for positioning the die pieces 1 after arranging.

[0042] See Figures 2-5 In the direction of the mold pieces 1 moving outwards, both sides of the mold pieces 1 are provided with piece-laying clearance grooves 1-1; along the direction of the moving outwards, the size of the piece-laying clearance grooves 1-1 of the multiple mold pieces 1 decreases sequentially; the piece-laying structure is a piece-laying plate 2, and there are two piece-laying plates 2, which are respectively located on both sides of the mold pieces 1; one end of the piece-laying plate 2 is connected to the mold core, and the other end of the piece-laying plate 2 is provided with a piece-laying step structure, which includes multiple piece-laying steps 2-1, which respectively cooperate with the piece-laying clearance grooves 1-1 of the multiple mold pieces 1; in the outwards state, the multiple piece-laying steps 2-1 are respectively located in the piece-laying clearance grooves 1-1 of the multiple mold pieces 1, and the gap between two adjacent mold pieces 1 is the piece-laying gap.

[0043] Furthermore, in the direction of the scattering movement, both sides of the mold piece 1 are provided with positioning bosses 1-2, which are laterally protruding and their protrusion direction is perpendicular to the direction of the scattering movement; along the direction of the scattering movement, the size of the protrusions of the positioning bosses 1-2 of the multiple mold pieces 1 decreases sequentially; the same set of positioning structures includes two positioning plates 3, which are located on both sides of the mold piece 1 respectively; the positioning plate 3 is provided with a positioning step structure, which includes multiple positioning steps 3-1, which respectively cooperate with the positioning bosses 1-2 of the multiple mold pieces 1; in the scattering state, the multiple positioning bosses 1-2 are respectively located on the multiple positioning steps 3-1.

[0044] Furthermore, each mold structure also includes a mold core, which includes a moving mold core 4 and a fixed mold core. The moving mold core 4 is connected to the forming drive mechanism and is connected to one end of the sheet plate 2.

[0045] Specifically, each mold structure also includes two guide pillars for guiding the mold piece 1.

[0046] See Figures 1-5 The working principle of the corrugated pipe water expansion forming mold structure in this embodiment is as follows:

[0047] In the mold closing process, under the driving of the molding driving mechanism, the movable mold core 4 moves close to the mold piece 1 in the direction opposite to the moving direction of the rowing, and drives the rowing plate 2 to move synchronously; the movable mold core 4 tightly fits the multiple mold pieces 1 apart from each other in turn, so as to shape the pipe; at this time, the rowing step structure of the rowing plate 2 is away from the corresponding rowing avoiding groove 1-1, and the positioning boss 1-2 of the multiple mold pieces 1 is also away from the corresponding positioning step 3-1. In the mold opening process, under the driving of the molding driving mechanism, the movable mold core 4 moves in the direction of the rowing, and drives the rowing plate 2 to move synchronously; because the size of the rowing avoiding groove 1-1 of the multiple mold pieces 1 gradually decreases along the rowing direction, the step at the front end of the rowing plate 2 enters the smallest rowing avoiding groove 1-1 and pushes the corresponding mold piece 1 to move forward, and then the other steps enter the corresponding rowing avoiding groove 1-1 in turn and push the corresponding mold piece 1 to move forward, at this time, the multiple mold pieces 1 are driven by the rowing plate 2 alone to be separated, until the positioning boss 1-2 of the multiple mold pieces 1 is stopped by the corresponding positioning step 3-1 of the positioning plate 3, so as to complete the rowing work of the multiple mold pieces 1.

[0048] Embodiment 2

[0049] Referring to Figures 6-9 Different from embodiment 1, the multiple mold pieces 1 of the same group in this embodiment include a fixed mold piece 5 in the middle and two movable mold pieces 6 on both sides of the fixed mold piece 1, and each movable mold piece 6 includes multiple movable mold pieces 6.

[0050] Further, each group of rowing structures includes four multi-section rowing expansion pipes, and each movable mold piece 6 is connected with two multi-section rowing expansion pipes on both sides; each multi-section rowing expansion pipe includes multiple expansion pipe pieces 7 connected in turn; along the rowing direction, the size of the multiple expansion pipe pieces 7 of the same multi-section rowing expansion pipe gradually decreases; the smallest expansion pipe piece 7 is fixedly connected with the mold core; each movable mold piece 6 is provided with a rowing avoiding groove matched with the expansion pipe piece 7 on both sides, and along the rowing direction, the size of the rowing avoiding grooves of the multiple movable mold pieces 6 of the same group gradually decreases; in the rowing state, the multiple expansion pipe pieces 7 of the same multi-section rowing expansion pipe are located in the rowing avoiding grooves of the multiple movable mold pieces 6 of the same group respectively. Compared with embodiment 1, the cost of the machine is much lower, and the occupied space is also small.

[0051] Further, the two side wings of the moving mold piece 6 are provided with a positioning avoiding groove 6-1 in the direction of the moving away, the size of the two side wings of the moving mold piece 6 gradually increases along the direction of the moving away; the same group of positioning structures includes two positioning plates 3, and the two positioning plates 3 are respectively located on the two sides of the mold piece 1; each positioning plate 3 is provided with two groups of positioning step structures which are respectively matched with the two groups of moving mold pieces 6, each group of positioning step structures includes a plurality of positioning steps 3-1 which are respectively matched with the positioning avoiding grooves 6-1 of the moving mold pieces 6 in the same group; in the moving away state, the plurality of positioning steps 3-1 of the same positioning plate 3 are respectively located in the positioning avoiding grooves 6-1 of the moving mold pieces 6 in the same group.

[0052] Further, the same group of positioning structures further includes a positioning seat 8 and a positioning hook 9, the positioning seat 8 is provided with two and is fixedly connected on the two side wings of the fixed mold piece 5, and the positioning seat 8 is provided with two positioning grooves 8-1 which are located on the two sides of the fixed mold piece 5; the positioning hook 9 is provided with two groups and is fixed on the moving mold piece 6 close to the fixed mold piece 5, and the positioning hook 9 extends into the corresponding positioning groove 8-1.

[0053] Further, each group of mold structures further includes a mold core, the mold core includes two moving mold cores 4 which are connected with the forming driving mechanism; the moving mold core 4 is connected with the smallest telescopic pipe 7 of the multi-section mold piece telescopic pipe.

[0054] Referring to Figures 6-9 The working principle of the bellows water forming mold structure of the embodiment is as follows:

[0055] In the mold closing forming process, under the driving of the forming driving mechanism, the two groups of moving mold cores 4 respectively move close to the mold piece 1 in the direction opposite to the moving away direction, and the moving mold cores 4 sequentially tightly adhere the spaced moving mold pieces 6 to the fixed mold piece 5 in the middle, so as to shape the pipe; at the same time, the moving mold core 4 first drives the smallest telescopic pipe 7 to retract into the adjacent telescopic pipe 7 with larger size, and when the moving mold core 4 approaches the moving mold piece 6, the moving mold piece 6 is pushed to shrink the next telescopic pipe 7, until all the mold pieces 1 are tightly adhered together. At this time, the positioning steps 3-1 of the positioning plate 3 are away from the positioning avoiding grooves 6-1 of the corresponding moving mold piece 6.

[0056] In the mold parting process, two groups of movable mold cores 4 are driven to move in the direction of parting by the forming driving mechanism; as the sizes of the multiple telescopic tube pieces 7 of the same multi-section parting pipe gradually decrease along the direction of parting, the movable mold core 4 first pulls the telescopic tube piece 7 with the smallest size to stretch out from the adjacent telescopic tube piece 7 with a larger size, then the telescopic tube piece 7 with the smallest size pulls the adjacent telescopic tube piece 7 with a larger size to stretch out from the next telescopic tube piece 7; at the same time, the telescopic tube piece 7 with the larger size pushes the movable mold piece 6 corresponding to the telescopic tube piece 7 with the smallest size to part; according to the above operation, the multiple telescopic tube pieces 7 are sequentially stretched out and push the movable mold pieces 6 of the partition wall to part, until the multiple movable mold pieces 6 are on the multiple positioning steps 3-1 of the positioning plate 3, the movable mold piece 6 close to the fixed mold piece 5 is moved in the corresponding positioning groove 8-1 by the positioning hook 9, and the positioning groove 8-1 positions the positioning hook 9, thereby completing the parting work of the multiple mold pieces 1.

[0057] The above is the preferred embodiment of the present application, but the embodiment of the present application is not limited by the above content, any change, modification, replacement, combination, simplification made without departing from the spirit and principle of the present application shall be equivalent replacement, which is included in the protection scope of the present application.

Claims

1. A bellows hydro-form die structure characterized by, Two sets of mold pieces are provided, each set including multiple mold pieces, a piece spacing structure for spacing the multiple mold pieces apart, and a positioning structure for positioning the spaced mold pieces; Both sides of the mold piece are provided with a piece spacing avoidance groove in the direction of the piece spacing movement; the size of the piece spacing avoidance groove of the multiple mold pieces gradually decreases along the direction of the piece spacing movement; One end of the piece spacing structure is connected to the mold core, and the other end of the piece spacing structure is provided with a piece spacing step structure including multiple piece spacing steps that are matched with the piece spacing avoidance grooves of the multiple mold pieces; in the spaced state, the multiple piece spacing steps are respectively located in the piece spacing avoidance grooves of the multiple mold pieces, and the gap between the adjacent two mold pieces is a piece spacing gap.

2. The bellows hydro-form die structure of claim 1, wherein, The piece spacing structure is a piece spacing plate provided with two piece spacing plates respectively located on both sides of the mold piece; one end of the piece spacing plate is connected to the mold core, and the other end of the piece spacing plate is provided with the piece spacing step structure.

3. The bellows hydro-form die structure of claim 2, wherein, Both sides of the mold piece are provided with a positioning boss in the direction of the piece spacing movement, the positioning boss is transversely protruding and the protruding direction is perpendicular to the direction of the piece spacing movement; the size of the positioning boss of the multiple mold pieces gradually decreases along the direction of the piece spacing movement; The same set of positioning structures includes two positioning plates respectively located on both sides of the mold piece; the positioning plate is provided with a positioning step structure including multiple positioning steps that are matched with the positioning bosses of the multiple mold pieces; in the spaced state, the multiple positioning bosses are respectively located on the multiple positioning steps.

4. The bellows hydro-form die structure of claim 3, wherein, Each set of mold structures further includes a mold core including a movable mold core and a fixed mold core, the movable mold core is connected to a molding driving mechanism, and one end of the movable mold core is connected to the piece spacing plate.

5. The bellows hydro-form die structure of claim 1 wherein, The multiple mold pieces of the same set include a fixed mold piece located in the middle and two movable mold pieces located on both sides of the fixed mold piece, and each movable mold piece includes multiple movable mold pieces.

6. The bellows hydro-form die structure of claim 5, wherein, Each set of piece spacing structures includes four multi-section piece spacing telescopic pipes, and two multi-section piece spacing telescopic pipes are respectively connected to both sides of each movable mold piece; each multi-section piece spacing telescopic pipe includes multiple telescopic pipe pieces connected in sequence; the size of the multiple telescopic pipe pieces of the same multi-section piece spacing telescopic pipe gradually decreases along the direction of the piece spacing movement; the smallest telescopic pipe piece is fixedly connected to the mold core; Both sides of the movable mold piece are provided with a piece spacing avoidance groove matched with the telescopic pipe piece, and the size of the piece spacing avoidance groove of the multiple movable mold pieces of the same set gradually decreases along the direction of the piece spacing movement; In the spaced state, the multiple telescopic pipe pieces of the same multi-section piece spacing telescopic pipe are respectively located in the piece spacing avoidance grooves of the multiple movable mold pieces of the same set.

7. The bellows hydro-form die structure of claim 6 wherein, Both sides of the movable mold piece are provided with a positioning avoidance groove in the direction of the piece spacing movement, and the size of both sides of the multiple movable mold pieces of the same set gradually increases along the direction of the piece spacing movement; The same set of positioning structures includes two positioning plates, which are respectively arranged on the two sides of the mold piece; each positioning plate is provided with two sets of positioning step structures which are respectively matched with two groups of mobile mold pieces; each set of positioning step structures includes a plurality of positioning steps which are respectively matched with the positioning avoidance grooves of the same group of mobile mold pieces; in the arranged state, the plurality of positioning steps of the same positioning plate are respectively arranged in the positioning avoidance grooves of the same group of mobile mold pieces.

8. The bellows hydro-form die structure of claim 7, wherein, The same set of positioning structures further includes a positioning seat and a positioning hook; the positioning seat is provided with two and is fixedly connected on the two side wings of the fixed mold piece; the positioning seat is provided with two positioning grooves on the two sides of the fixed mold piece; the positioning hook is provided with two sets and is fixed on the mobile mold piece close to the fixed mold piece; the positioning hook extends into the corresponding positioning groove.

9. The bellows hydro-form die structure of claim 6 wherein, Each set of mold structures further includes a mold core, which includes two movable mold cores, both of which are connected with a forming driving mechanism; the movable mold core is connected with the smallest telescopic pipe of the multi-section piece telescopic pipe.

10. A bellows hydro-forming apparatus characterized by, The corrugated pipe water forming mold structure includes any one of claims 1-9.

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