CN221434603U - Forming device for ultra-high amplitude of thin-wall stainless steel tube - Google Patents

Abstract

The utility model discloses a forming device of super-expansion of a thin-wall stainless steel pipe, which is used for processing a pipe blank and comprises the following components: the forming die comprises a first die and a second die, and the first die and the second die are matched together to form a die cavity; the sealing assembly comprises two sealing push rods, the sealing push rods can move along the left-right direction to seal the pipe blanks, water supply pipelines are arranged in the sealing push rods, and the water supply pipelines can supply water to the inner cavities of the pipe blanks to expand the pipe blanks; a driving part; the two sealing push rods respectively seal the left end and the right end of the pipe blank, liquid is injected into the inner cavity of the pipe blank through the water supply pipeline, the inner pressure of the pipe blank is gradually increased to cause the pipe blank to be gradually expanded outwards, the pipe blank is deformed, materials at the two ends of the pipe blank are rapidly compensated to the middle part to enter the die cavity, the balance between the two ends of the pipe blank and the sealing push rods is further broken, the driving part controls and drives the two sealing push rods to axially move so as to keep the two ends of the sealing pipe blank, the pipe blank is ensured to be smooth and free from bending in the deformation process, and the yield is improved.

Description

A forming device for thin-walled stainless steel pipe with super expansion

Technical Field

The utility model relates to the technical field of pipe processing, in particular to a forming device for super-expanding a thin-wall stainless steel pipe.

Background technique

When manufacturing pipe parts with larger diameters, usually a blank tube with smaller diameter is used as the material, and the production is carried out by utilizing the principle of thermal expansion and contraction, or by using a complex forging process, thereby obtaining a molded tube that is larger than the blank tube. The above two methods have low manufacturing efficiency and high manufacturing costs. The molded tube may also shrink, resulting in a low yield rate.

Utility Model Content

The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the utility model provides a forming device for super-expansion of thin-walled stainless steel pipes.

The present invention provides a thin-walled stainless steel pipe super-expansion forming device for processing a tube blank, and the thin-walled stainless steel pipe super-expansion forming device comprises:

The forming mold comprises a first mold and a second mold, wherein the second mold is located above the first mold, the first mold and the second mold cooperate to form a mold cavity, the mold cavity extends in the left-right direction, and the tube blank is placed in the mold cavity and extends in the left-right direction;

A sealing assembly, wherein the sealing assembly comprises two sealing push rods, the sealing push rods are placed in the mold cavity, the two sealing push rods are respectively located at the left and right ends of the tube embryo, the sealing push rods can move in the left and right directions to seal the tube embryo, and a water supply pipe is arranged in the sealing push rod, and the water supply pipe can supply water to the inner cavity of the tube embryo to expand the tube embryo;

A driving component is used to drive the sealing push rod to move in the left-right direction.

The ultra-expanded thin-walled stainless steel pipe forming device according to the embodiment of the utility model has at least the following technical effects: two sealing push rods seal the left and right ends of the tube embryo respectively, and liquid is injected into the inner cavity of the tube embryo through the water supply pipe. The water pressure in the tube embryo gradually increases, so that the tube embryo gradually expands from the inside to the outside, and the tube embryo is deformed and gradually fits on the inner wall of the mold cavity. The materials at both ends of the tube embryo quickly compensate to the middle to complete the forming of ultra-thin-walled lightweight pipe products. During this process, the driving component drives the two sealing push rods to move axially to continuously seal and push the two ends of the tube embryo, thereby ensuring that the tube embryo is smooth and without bending during the deformation process, thereby improving the yield rate; and the method of manufacturing thin-walled ultra-expanded pipe products has the advantages of low production cost and high manufacturing efficiency, and is widely applicable to the processing of pipe blanks.

According to some embodiments of the utility model, the mold cavity includes a molding cavity and an outer cavity, the two ends of the molding cavity are respectively connected to the two outer cavities, the inner diameter of the molding cavity is smaller than the inner diameter of the outer cavity, the two sealing push rods are respectively located in the two outer cavities, the tube embryo is located in the molding cavity and the two ends are respectively located in the two outer cavities, and the sealing push rod can push the tube embryo so that the tube embryo is completely located in the molding cavity.

According to some embodiments of the utility model, the sealing push rod includes an outer sleeve and an inner push head, the inner push head is passed through and slidably connected to the outer sleeve, the outer sleeve can move in the left and right directions to be sleeved on one end of the tube embryo, and the inner push head can move in the left and right directions to seal one end of the tube embryo.

According to some embodiments of the utility model, the inner wall of the outer sleeve is provided with a first protrusion, and the inner push head is provided with a second protrusion, and the first protrusion can abut against the second protrusion to limit the movement of the inner push head in a direction away from the tube embryo.

According to some embodiments of the utility model, the outer sleeve is provided with a water injection hole, the inner push head is provided with the water supply pipe, and the water injection hole is connected to the water supply pipe.

According to some embodiments of the utility model, the inner wall of the outer sleeve is provided with a first annular groove, a first sealing ring is provided in the first annular groove, and the first sealing ring is used to abut against the outer peripheral wall of the tube embryo.

According to some embodiments of the utility model, the inner wall of the outer sleeve is provided with a second annular groove, a second sealing ring is provided in the second annular groove, and the second sealing ring is sleeved and tightly fitted to the outer peripheral wall of the inner push head.

According to some embodiments of the present invention, a tapered portion is provided at one end of the inner push head close to the tube embryo, and the outer diameter of the tapered portion gradually increases in a direction away from the tube embryo.

According to some embodiments of the present invention, both ends of the cavity wall of the molding cavity are provided with annular protrusions.

According to some embodiments of the utility model, it also includes an insert, two of which are symmetrically arranged in the mold cavity, part of the inner cavity of the insert is part of the molding cavity, part of the inner cavity of the insert is part of the outer cavity, and the inner wall of the insert is provided with the annular protrusion.

Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

FIG1 is a schematic structural diagram of a thin-walled stainless steel pipe super-expansion forming device according to some embodiments of the present invention;

FIG2 is an exploded view of a forming device for a thin-walled stainless steel pipe with an over-increase in diameter according to some embodiments of the present invention;

FIG3 is a cross-sectional view of a forming mold according to some embodiments of the present invention;

FIG4 is a cross-sectional view of a forming device for a thin-walled stainless steel pipe with an over-increase in diameter according to some embodiments of the present invention;

FIG5 is a schematic diagram of the structure of an inner push head in some embodiments of the utility model;

FIG6 is a cross-sectional view of an outer sleeve of some embodiments of the present utility model;

FIG. 7 is a cross-sectional view of an insert according to some embodiments of the present invention.

Figure Number:

The forming mold 100, the first mold 110, the second mold 120, the mold cavity 130, the molding cavity 131, the outer cavity 132, the annular protrusion 140, and the insert 150;

Sealing assembly 200, sealing push rod 210, outer sleeve 220, first convex portion 221, water injection hole 222, first annular groove 223, first sealing ring 224, second annular groove 225, second sealing ring 226, inner push head 230, second convex portion 231, water supply pipe 232, tapered portion 233;

Tube embryo 300.

Detailed ways

The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

In the description of the utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings.

According to some embodiments of the utility model, referring to FIGS. 1 to 4, a forming device for super-expansion of a thin-walled stainless steel pipe is used to process a tube blank 300, and the forming device for super-expansion of a thin-walled stainless steel pipe includes a forming mold 100, a sealing assembly 200, and a driving component. Referring to FIGS. 2 and 3, the forming mold 100 includes a first mold 110 and a second mold 120, and the second mold 120 is located above the first mold 110. The first mold 110 and the second mold 120 cooperate to form a mold cavity 130, and the mold cavity 130 extends in the left-right direction. The tube blank 300 is placed in the mold cavity 130 and extends in the left-right direction. 1 and 2 , the sealing assembly 200 includes two sealing push rods 210, which are disposed in the mold cavity 130. The two sealing push rods 210 are respectively located at the left and right ends of the tube embryo 300. The driving component can drive the sealing push rods 210 to move in the left and right directions to seal the two ends of the tube embryo 300. A water supply pipe 232 is provided in the sealing push rod 210. After the sealing push rods 210 seal the two ends of the tube embryo 300, the water supply pipe 232 can supply water to the inner cavity of the tube embryo 300, so that the interior of the tube embryo 300 is gradually filled with liquid, and the tube embryo 300 is gradually expanded under the action of water pressure.

It can be understood that the two sealing push rods 210 seal the left and right ends of the tube embryo 300 respectively, and the liquid is injected into the inner cavity of the tube embryo 300 through the water supply pipe 232. The tube embryo 300 is gradually expanded from the inside to the outside under the action of water pressure to deform the tube embryo 300 and gradually fit the inner wall of the mold cavity 130, and the two ends of the tube embryo 300 quickly compensate toward the middle. During this process, the driving component drives the two sealing push rods 210 to move axially to continuously seal and push the two ends of the tube embryo 300 to move toward the middle of the tube embryo 300. The materials at the two ends of the tube embryo 300 compensate toward the middle, thereby ensuring that the tube embryo 300 remains sealed and leak-proof, while ensuring that the tube embryo 300 is smooth and without bending during the deformation process, thereby improving the yield rate; and the method of manufacturing tube products with thin-walled super-increase has the advantages of low production cost and high manufacturing efficiency, and is widely applicable to the processing of tube blanks.

According to some embodiments of the present utility model, referring to FIGS. 3 and 4 , the mold cavity 130 includes a molding cavity 131 and an outer cavity 132, the two ends of the molding cavity 131 are respectively connected to the two outer cavities 132, the inner diameter of the molding cavity 131 is smaller than the inner diameter of the outer cavity 132, the outer diameter of the tube embryo 300 is smaller than the inner diameter of the molding cavity 131, the two sealing push rods 210 are respectively located in the two outer cavities 132 and can move in the left and right directions, the tube embryo 300 is partially located in the molding cavity 131 and the two ends of the tube embryo 300 are respectively located in the two outer cavities 132. 32, the sealing push rods 210 located on the left and right sides can cooperate to push the tube embryo 300 so that the left and right ends of the tube embryo 300 completely enter the molding cavity 131. In this process, the sealing push rods 210 seal the two ends of the tube embryo 300, and the water supply pipe 232 supplies water to the inner cavity of the tube embryo 300, so that the inside of the tube embryo 300 is gradually filled with liquid, and the tube embryo 300 is gradually expanded under the action of water pressure, so that the tube embryo 300 is attached to the cavity wall of the molding cavity 131, thereby completing the processing of the tube embryo 300.

According to some embodiments of the present invention, referring to Figures 4 to 6, the sealing push rod 210 includes an outer sleeve 220 and an inner push head 230. The inner push head 230 is passed through and slidably connected to the outer sleeve 220. The outer sleeve 220 can move in the left and right directions to be sleeved on one end of the tube embryo 300. The inner push head 230 can move in the left and right directions to seal one end of the tube embryo 300.

It can be understood that, referring to FIG. 4 , both the outer sleeve 220 and the inner push head 230 can move in the left-right direction, and the inner push head 230 and the outer sleeve 220 are independent of each other.

It can also be understood that the driving component is a composite oil cylinder, which can independently drive the outer sleeve 220 and the inner push head 230 to move.

Preferably, referring to Figures 4 to 6, the inner wall of the outer sleeve 220 is provided with a first protrusion 221, and the inner push head 230 is provided with a second protrusion 231. The first protrusion 221 can abut against the second protrusion 231 to limit the movement of the inner push head 230 in a direction away from the tube blank 300, thereby preventing the inner push head 230 from falling off from the outer sleeve 220.

According to some embodiments of the utility model, referring to Fig. 4 and Fig. 6, a water injection hole 222 is provided on the outer peripheral wall of the outer sleeve 220 to communicate with the inner cavity of the outer sleeve 220. A water supply pipe 232 is provided in the inner push head 230, one end of which penetrates the outer peripheral wall of the inner push head 230 and communicates with the inner cavity of the outer sleeve 220, so that the water injection hole 222 and the water supply pipe 232 are communicated, and the other end of the water supply pipe 232 penetrates the inner push head 230 in the direction of the tube embryo 300, for example, the water supply pipe 232 of the inner push head 230 located on the left side of the tube embryo 300 penetrates the inner push head 230 to the right, so that when the inner push head 230 blocks the port of the tube embryo 300, the liquid can be supplied to the inner cavity of the tube embryo 300 through the water supply pipe 232.

It can be understood that, referring to Figure 4, the outer sleeves 220 at the left and right ends of the tube embryo 300 first move toward the direction close to the molding cavity 131, so that the port of the tube embryo 300 is inserted into the outer sleeve 220, and the outer sleeve 220 seals the tube embryo 300 to prevent water leakage in the tube embryo 300, and then, the inner push head 230 moves toward the direction close to the molding cavity 131 to abut against the port of the tube embryo 300. At this time, water enters the interior of the tube embryo 300 through the water injection hole 222 and the water supply pipe 232. The tube embryo 300 is expanded after being subjected to the internal pressure of the water, and the materials at both ends of the tube embryo 300 are quickly compensated into the molding cavity 131. The outer sleeve 220 continues to move toward the direction close to the molding cavity 131 to prevent the port of the tube embryo 300 from detaching from the outer sleeve 220 due to shrinkage, resulting in water leakage, and the inner push head 230 continues to move toward the direction close to the molding cavity 131 to push the materials at both ends of the tube embryo 300 to enter the molding cavity 131. Under the dual effects of the internal pressure of the water and the internal push head 230, the force balance of the port of the tube blank 300 is destroyed, the length of the tube blank 300 is gradually reduced and the tube diameter is gradually expanded to complete the ultra-thin-wall lightweight tube forming.

According to some embodiments of the present invention, referring to FIG. 4 , water enters the interior of the tube embryo 300 through the water injection hole 222 of the outer sleeve 220 on the left and the water supply pipe 232 of the inner push head 230. At this time, the gas in the tube embryo 300 flows from left to right under the push of water to be discharged from the water injection hole 222 of the outer sleeve 220 on the right and the water supply pipe 232 of the inner push head 230, and then the water injection hole 222 of the outer sleeve 220 on the right and the water supply pipe 232 of the inner push head 230 are blocked. The gas inside the tube embryo 300 is completely discharged to ensure that the ultra-thin wall molding can be smoothly carried out and to avoid bursting.

Preferably, referring to Figures 4 and 6, the inner wall of the outer sleeve 220 is provided with a first annular groove 223, and a first sealing ring 224 is provided in the first annular groove 223. When the outer sleeve 220 moves along the left and right directions to be sleeved on one end of the tube embryo 300, the inner side of the first sealing ring 224 abuts against the outer peripheral wall of the tube embryo 300 to prevent water from leaking out from the gap between the tube embryo 300 and the outer sleeve 220.

Preferably, referring to Figures 4 and 6, the inner wall of the outer sleeve 220 is provided with a second annular groove 225, and the second annular groove 225 is located on the side of the water injection hole 222 away from the tube embryo 300. A second sealing ring 226 is provided in the second annular groove 225. The second sealing ring 226 is sleeved and tightly fitted to the outer peripheral wall of the inner push head 230 to prevent water from leaking out from the gap between the inner push head 230 and the outer sleeve 220.

According to some embodiments of the present invention, referring to FIG. 4 and FIG. 5 , a conical portion 233 is provided at one end of the inner push head 230 close to the tube embryo 300 , and the outer diameter of the conical portion 233 gradually increases in a direction away from the tube embryo 300 .

It is understandable that when the inner push head 230 blocks the port of the tube embryo 300, the tapered portion 233 guides the tube embryo 300, thereby ensuring the coaxiality of the inner push head 230 and the tube embryo 300, and preventing the tube embryo 300 from suddenly bending due to uneven force during processing.

According to some embodiments of the present invention, referring to FIG. 3 , both ends of the cavity wall of the molding cavity 131 are provided with annular protrusions 140 , thereby ensuring that the tube embryo 300 is completely formed in the molding cavity 131 , and preventing the two ends of the tube embryo 300 from returning to the outer cavity 132 during the molding process.

Preferably, referring to Fig. 2, Fig. 3 and Fig. 7, the thin-walled stainless steel pipe super-expansion forming device further comprises an insert 150, two inserts 150 are symmetrically arranged in the mold cavity 130, and the inner wall of the insert 150 is provided with an annular convex portion 140. The inner cavity of the annular convex portion 140 on one side close to the middle of the mold cavity 130 is a molding cavity 131, and the inner cavity of the annular convex portion 140 on one side away from the middle of the mold cavity 130 is an outer cavity 132.

It is understandable that by replacing different inserts 150 , the position of the annular protrusion 140 can be changed, thereby changing the length of the molding cavity 131 to adapt to tube blanks 300 of different specifications and improve versatility.

It can also be understood that the diameter of the tube blank 300 is A1, and the diameter of the formed tube is A2, that is, the expansion rate δ is: (A2-A1)/A1.

Preferably, the diameter of the tube blank 300 in this embodiment is A1=60 mm, and the diameter A2 of the formed tube is A2=110 mm, that is, the expansion rate δ=83%.

It is understandable that the forming device of this embodiment can make the tube embryo 300 have an excellent expansion rate. It is known from multiple processing experiments that the maximum expansion rate δ of the tube embryo 300 can reach 90%, thereby improving the production quality of the tube embryo 300 and facilitating the use of the tube embryo 300 to manufacture a larger diameter formed tube.

In the description of this specification, the description with reference to the term "some embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims (10)

1. A forming device for ultra-high amplitude of thin-walled stainless steel pipe for processing a pipe blank (300), characterized by comprising:

The forming die (100) comprises a first die (110) and a second die (120), wherein the second die (120) is positioned above the first die (110), the first die (110) and the second die (120) are matched together to form a die cavity (130), the die cavity (130) extends along the left-right direction, and the pipe blank (300) is arranged in the die cavity (130) and extends along the left-right direction;

The sealing assembly (200), the sealing assembly (200) comprises two sealing push rods (210), the sealing push rods (210) are arranged in the die cavity (130), the two sealing push rods (210) are respectively positioned at the left end and the right end of the pipe blank (300), the sealing push rods (210) can move along the left-right direction to seal the pipe blank (300), a water supply pipeline (232) is arranged in the sealing push rods (210), and the water supply pipeline (232) can supply water to the inner cavity of the pipe blank (300) to enlarge the pipe blank (300);

And the driving part is used for driving the sealing push rod (210) to move along the left-right direction.

2. The forming device of the ultra-high amplitude thin-wall stainless steel pipe according to claim 1, wherein the die cavity (130) comprises a forming cavity (131) and an outer cavity (132), two ends of the forming cavity (131) are respectively communicated with the two outer cavities (132), the inner diameter of the forming cavity (131) is smaller than that of the outer cavities (132), two sealing push rods (210) are respectively arranged in the two outer cavities (132), the pipe blank (300) is arranged in the forming cavity (131) and two ends of the pipe blank are respectively arranged in the two outer cavities (132), and the sealing push rods (210) can push the pipe blank (300) so that the pipe blank (300) is completely arranged in the forming cavity (131).

3. The forming device of ultra-high amplitude of thin-walled stainless steel pipe according to claim 1, wherein the sealing push rod (210) comprises an outer sleeve (220) and an inner push head (230), the inner push head (230) is penetrated and slidably connected to the outer sleeve (220), the outer sleeve (220) can move in a left-right direction to be sleeved at one end of the pipe blank (300), and the inner push head (230) can move in the left-right direction to block one end of the pipe blank (300).

4. A forming device for ultra-high amplitude of thin-walled stainless steel pipe according to claim 3, characterized in that the inner wall of the outer sleeve (220) is provided with a first protrusion (221), the inner push head (230) is provided with a second protrusion (231), and the first protrusion (221) can abut against the second protrusion (231) to limit the inner push head (230) to move in a direction away from the pipe blank (300).

5. A device for forming ultra-high amplitude thin-walled stainless steel pipes according to claim 3, characterized in that the outer sleeve (220) is provided with a water injection hole (222), the inner push head (230) is internally provided with the water supply pipeline (232), and the water injection hole (222) is communicated with the water supply pipeline (232).

6. A forming device for ultra-high expansion of thin-walled stainless steel pipes according to claim 3, characterized in that the inner wall of the outer sleeve (220) is provided with a first annular groove (223), a first sealing ring (224) is arranged in the first annular groove (223), and the first sealing ring (224) is used for abutting against the outer peripheral wall of the pipe blank (300).

7. A forming device for ultra-high amplitude of thin-walled stainless steel pipes according to claim 3, characterized in that the inner wall of the outer sleeve (220) is provided with a second annular groove (225), a second sealing ring (226) is arranged in the second annular groove (225), and the second sealing ring (226) is sleeved and closely attached to the outer peripheral wall of the inner push head (230).

8. A device for forming ultra-high amplitude thin-walled stainless steel pipe according to claim 3, characterized in that the end of the inner push head (230) close to the pipe blank (300) is provided with a tapered portion (233), and the outer diameter of the tapered portion (233) gradually increases in a direction away from the pipe blank (300).

9. The device for forming the ultra-high amplitude of the thin-walled stainless steel pipe according to claim 2, wherein annular protrusions (140) are arranged at both ends of the cavity wall of the forming cavity (131).

10. The forming device of ultra-high amplitude of thin-walled stainless steel pipes according to claim 9, further comprising an insert (150), wherein two inserts (150) are symmetrically disposed in the die cavity (130), a part of an inner cavity of the insert (150) is a part of the forming cavity (131), a part of an inner cavity of the insert (150) is a part of the outer cavity (132), and the annular protrusion (140) is disposed on an inner wall of the insert (150).