CN116900118A - Core rod, pipe bending device and method for ultrathin-wall pipe bending forming - Google Patents
Core rod, pipe bending device and method for ultrathin-wall pipe bending forming Download PDFInfo
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- CN116900118A CN116900118A CN202310942595.1A CN202310942595A CN116900118A CN 116900118 A CN116900118 A CN 116900118A CN 202310942595 A CN202310942595 A CN 202310942595A CN 116900118 A CN116900118 A CN 116900118A
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- 238000005452 bending Methods 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000011324 bead Substances 0.000 claims abstract description 110
- 230000008093 supporting effect Effects 0.000 claims abstract description 72
- 238000010438 heat treatment Methods 0.000 claims abstract description 45
- 230000000149 penetrating effect Effects 0.000 claims abstract description 7
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 238000013459 approach Methods 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 4
- 230000017525 heat dissipation Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 12
- 229910002804 graphite Inorganic materials 0.000 description 12
- 239000010439 graphite Substances 0.000 description 12
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 235000015842 Hesperis Nutrition 0.000 description 1
- 235000012633 Iberis amara Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/01—Bending tubes using mandrels or the like the mandrel being flexible and engaging the entire tube length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/003—Positioning devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/05—Bending tubes using mandrels or the like co-operating with forming members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/16—Auxiliary equipment, e.g. machines for filling tubes with sand
- B21D9/18—Auxiliary equipment, e.g. machines for filling tubes with sand for heating or cooling of bends
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention discloses a core rod, a pipe bending device and a method for bending and forming an ultrathin-wall catheter, which comprise a core rod main body, a bent inner support body and a clamping inner support body which are connected in sequence; the bending inner support body comprises a plurality of core rod beads which are connected in sequence, the two connected core rod beads can swing relatively, and the core rod beads are in clearance fit with the guide pipe; the clamping inner support body comprises a plurality of supporting beads which are connected in sequence, the supporting beads are all arranged on the same flexible connecting piece in a penetrating mode, and heating wires are arranged on the supporting beads in a penetrating mode; two ends of the bending inner support body are respectively connected with the flexible connecting piece and the core rod main body; in a natural state, the support beads are in clearance fit with the catheter; after the heating wire supplies heat for the supporting beads, the supporting beads are heated and expanded to support the inner wall of the guide pipe. When the ultrathin-wall catheter is bent, the inner side of the clamped part of the catheter can be supported, and the position of the inner support body can be changed more flexibly by drawing the core rod, so that the production efficiency and the yield of the bent pipe are greatly improved.
Description
Technical Field
The invention relates to the field of aerospace, in particular to a core rod, a pipe bending device and a method for bending and forming an ultrathin-wall pipe.
Background
The aircraft and the rocket are provided with a plurality of metal hollow pipe components commonly called as 'guide pipes', the guide pipes are mainly used for conveying various liquids and gases, supporting fuel oil, power and the like required by the aircraft and the rocket to finish various work tasks, and the guide pipes are very important parts on the aircraft and the rocket. The types of the guide pipes used in the plane and rocket are very many, and the shapes are complex and various, so that the inner core is added to support in the bending process to play a role in increasing friction force. Since the walls of the pipes used in aircraft and rockets are very thin, it is necessary to clamp the straight sections of the pipes when bending the pipes, but some pipes have short straight sections between two bends, and the pipes cannot be clamped due to insufficient length of the straight sections.
The existing clamping and friction increasing for ultrathin-wall pipes often adopts the addition of an anti-skid groove at the arc groove of a clamping die and an insert, or the clamping of a slug at the front end of a supporting rod. The clamping mark can be generated when the anti-skid groove clamps the ultrathin wall pipe, and damage is generated to the surface of the conduit; the supporting rod is suitable for the condition of single bend, when the pipe fitting is complex in shape and has a plurality of bends, the front end plug supporting rod cannot meet the bending condition.
Patent document CN115382964a discloses a method for thermally bending a metal pipe using thermally expanded graphite as a filler, wherein the thermally expanded graphite is first placed in a portion of the pipe blank to be bent and deformed, and both ends of the portion filled with the thermally expanded graphite are sealed to obtain a pipe blank filled with the thermally expanded graphite; heating the whole or partial area of the tube blank filled with the thermal expansion graphite to the forming temperature of the tube blank, and preserving heat to obtain a heated tube blank; bending the heated tube blank to reach a required bending angle; and stopping heating, cooling to room temperature, and taking out the thermally expanded graphite.
When the prior art is applied to the thin-wall catheter tube with the multidirectional multi-angle, since the collision graphite in the catheter tube needs to be sealed, the expanded graphite needs to be filled between two adjacent bent angles, and since the inner core is needed to support the inner wall of the catheter tube when the catheter tube is bent, the graphite needs to be refilled before each bent angle of the catheter tube, the graphite is reheated, and the heat is preserved again, so that the processing process of the thin-wall catheter tube is time-consuming and labor-consuming. And because graphite needs to be sealed, the thin-wall conduit has the characteristics of multiple directions and multiple angles, and the disassembly and assembly of the graphite are more troublesome.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a core rod, a pipe bending device and a method for bending and forming an ultrathin-wall pipe, which can clamp the thin-wall pipe by a clamping die during pipe bending, can not form a clamping mark on the outer wall of the pipe, and can effectively improve the bending efficiency and the yield of the multi-directional multi-angle thin-wall pipe.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the core rod comprises a core rod main body, a bent inner support body and a clamping inner support body which are connected in sequence; the bending inner support body comprises a plurality of core rod beads which are connected in sequence, the two connected core rod beads can swing relatively, and the core rod beads are in clearance fit with the guide pipe; the clamping inner support body comprises a plurality of supporting beads which are connected in sequence, the supporting beads are all arranged on the same flexible connecting piece in a penetrating mode, and heating wires are arranged on the supporting beads in a penetrating mode; two ends of the bending inner support body are respectively connected with the flexible connecting piece and the core rod main body; in a natural state, the support beads are in clearance fit with the catheter; after the heating wire supplies heat for the supporting beads, the supporting beads are heated and expanded to support the inner wall of the guide pipe.
Preferably, there are a plurality of heating wires, and the plurality of heating wires are uniformly arranged on the support beads.
Preferably, the flexible connection unit comprises a steel wire rope.
Preferably, two plugs are fixed on the flexible connecting piece, and the supporting beads are located between the two plugs.
Preferably, the support beads are a tight fit with the flexible connection unit.
Preferably, the core rod beads comprise a supporting part and a connecting part, the supporting part is sleeved and fixed on the connecting part, two adjacent core rod beads are connected through the connecting part, one end of the connecting part is protruded with a ball head, the other end of the connecting part is provided with a ball groove, and the two connected core rod beads are connected through the ball head and the ball groove.
Preferably, the outer peripheral surface of the connecting part is provided with a limiting part in a protruding mode, the outer peripheral surface of the connecting part is provided with a limiting groove, the connecting part is clamped with a baffle plate, the supporting part is sleeved on the connecting part, and the supporting part is clamped by the baffle plate and the limiting part.
Preferably, the support portion is formed by splicing two support flaps, which are fixed by a positioning pin.
The utility model provides a bending equipment for ultra-thin wall pipe bending, includes above-mentioned a plug that is used for ultra-thin wall pipe bending, bending equipment still includes wheel die holder, clamp mould and wheel mould, has seted up linear type first clamping groove and arc type's shaping groove on the outer peripheral face of wheel die holder, has seted up linear type second clamping groove on the clamp mould, and first clamping groove, shaping groove and second clamping groove internal diameter are unanimous, and first clamping groove and second clamping groove face-to-face set up, and wheel die holder and clamp mould are installed on the workstation with interval adjustable mode, the wheel mould can be around the shaping groove of wheel die holder.
The method for bending and forming the ultrathin-wall catheter is applied to the bending equipment for bending and forming the ultrathin-wall catheter, and the bent and formed catheter comprises a first straight line part, a first bending part, a second straight line part and a second bending part which are sequentially arranged; the specific process is as follows:
when the first bending part is bent: inserting the core rod into the guide pipe, pulling the core rod main body and the heating wire, and adjusting the position of the clamping inner support body in the guide pipe to enable the clamping inner support body to be positioned in a first straight line part of the guide pipe; then the heating wire is electrified to release heat, and the supporting beads are heated to expand and prop against the inner wall of the first straight line part; then the heating wire stops heating, the heating clamping die approaches to the wheel die holder, and the first linear part of the guide pipe is clamped, wherein a plurality of supporting beads are positioned between a first clamping groove of the wheel die holder and a second clamping groove of the clamping die; then the wheel die moves to push the guide pipe, so that the guide pipe is attached to a forming groove of the wheel die holder, and a first bending part is formed, wherein a bending inner support body of the core rod is positioned at the inner side of the first bending part, and the bending inner support body deforms along with the guide pipe and supports the inner wall of the first bending part in the process of forming the first bending part;
when the second bending part is bent:
the clamping die is far away from the wheel die holder to loosen the guide pipe, after the supporting beads shrink after heat dissipation, the mandrel main body and the heating wire are pulled, and the position of the clamping inner support body in the guide pipe is adjusted to enable the clamping inner support body to be positioned in a second linear part of the guide pipe; then the heating wire is electrified to release heat, and the supporting beads are heated to expand and prop against the inner wall of the second linear part; then the heating wire stops heating, the heating clamping die approaches to the wheel die holder, and the second linear part of the guide pipe is clamped, wherein a plurality of supporting beads are positioned between the first clamping groove of the wheel die holder and the second clamping groove of the clamping die; and then the wheel die moves to push the guide pipe, so that the guide pipe is attached to a forming groove of the wheel die holder, and a second bending part is formed, wherein the bent inner support body of the core rod is positioned at the inner side of the second bending part, and in the process of forming the second bending part, the bent inner support body deforms along with the guide pipe and supports the inner wall of the second bending part
The technical scheme of the invention has the beneficial effects that: so that the clamped part of the catheter can be supported when the ultrathin-wall catheter is bent, and the catheter can be stably clamped even if the part of the catheter which can be used for clamping is very short; on the other hand, the core rod is pulled to change the position of the inner supporting body in the clamping state, so that the position of the inner supporting body in the clamping state can be changed more flexibly, the same core rod can participate in bending at different angles on the same guide pipe, and the production efficiency and the yield of bent pipes are greatly improved.
Drawings
FIG. 1 is a schematic diagram of a pipe bending apparatus;
FIG. 2 is a schematic diagram of a second embodiment of a pipe bending apparatus;
FIG. 3 is a schematic view of the wheel mold base and clamping mold;
FIG. 4 is a schematic view of the structure of the core rod;
fig. 5 is a schematic structural view of a catheter.
Reference numerals: 11. wheel mold base; 111. a first clamping groove; 112. a forming groove; 12. clamping a die; 121. a second clamping groove; 21. a mandrel body; 22. a bolt; 23. a connecting column; 24. a core rod bead; 241. a connection portion; 242. a positioning pin; 243. a support portion; 244. a baffle; 25. a flexible connection member; 26. support the bead; 27. a heating wire; 3. a conduit; 31. a first straight line portion; 32. a first curved portion; 33. a second straight line portion; 34. and a second curved portion.
Description of the embodiments
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in 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 configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Examples
A core rod for bending and forming an ultra-thin wall catheter as shown in fig. 1 to 5, the core rod including a core rod main body 21, a bent inner support body, and a grip inner support body; the bending inner support body comprises a plurality of core rod beads 24 which are sequentially connected, the two connected core rod beads 24 can swing relatively, and the core rod beads 24 are in clearance fit with the guide pipe 3; the clamping inner support body comprises a plurality of supporting beads 26 which are connected in sequence, the supporting beads 26 are all arranged on the same flexible connecting piece 25 in a penetrating mode, and the supporting beads 26 are all connected with a heating wire 27; both ends of the bending inner support body are respectively connected with the flexible connecting piece 25 and the core rod main body 21; in the natural state, the support beads 26 are in clearance fit with the guide tube 3; after the heating wire 27 supplies heat to the supporting bead 26, the supporting bead 26 expands by heating to support the inner wall of the conduit 3.
The arrangement is such that the clamped portion of the catheter 3 can be supported when the ultra-thin wall catheter 3 is bent, so that even if the portion of the catheter 3 available for clamping is short, stable clamping of the catheter 3 can be ensured; on the other hand, the core rod is pulled to change the position of the inner supporting body in the clamping state, so that the position of the inner supporting body in the clamping state can be changed more flexibly, the same core rod can participate in bending of the same guide pipe 3 at different angles, and the production efficiency and the yield of bent pipes are greatly improved.
To facilitate movement of the gripping inner support, in this embodiment, a plurality of support beads 26 are provided in a spaced relationship as shown in fig. 2 and 4. By this arrangement, the plurality of support beads 26 are arranged in a gap, so that the support beads 26 can move relatively, and the plurality of support beads 26 are arranged on the same flexible connecting piece 25, so that the clamping inner support body in a natural state can move in the bending part of the catheter 3 more easily, and the movement of the core rod is more flexible.
In other embodiments, the plurality of support beads 26 are sequentially abutted together as a unit. So set up for the support body has better supporting effect in the centre gripping of integral type.
In this embodiment, the flexible connection unit 25 is a steel wire rope. So set up, the installation of each supporting bead 26 of being convenient for guarantees the holistic intensity of plug, and the pull of the internal support body of centre gripping of being convenient for simultaneously, because wire rope's rigidity is great for install the supporting bead 26 on wire rope and can be in vertical state, and then can revise the gesture of supporting bead 26 in pipe 3, make the gesture of a plurality of supporting beads 26 obtain unifying, and then make the inner wall of pipe 3 can be by even propping up. Further, two plugs are fixed on the flexible connecting piece 25, and the supporting bead 26 is located between the two plugs.
In other embodiments, the flexible connection 25 may also be a bungee cord. The setting makes the interval of the inner support body of centre gripping and the inner support body of bending better regulation, the location of the inner support body of centre gripping and the inner support body of bending of being convenient for.
In order to facilitate the installation of the supporting beads 26, in this embodiment, the steel wire rope is sleeved with a plurality of sleeves, the sleeves are tightly matched with the flexible connecting pieces 25, the plurality of sleeves are in one-to-one correspondence with the plurality of supporting beads 26, the supporting beads 26 are sleeved on the sleeves, the sleeves penetrate through the supporting beads 26, and two ends of each sleeve are outwards folded to limit the supporting beads 26 on the sleeves. Further, two plugs are fixedly mounted on the steel wire, and a plurality of supporting beads 26 are located between the two plugs.
In order to enable the support beads 26 to expand uniformly, in this embodiment, the steel wire rope passes through the center of the support beads 26, three heating wires 27 are provided, any one heating wire 27 passes through all the support beads 26, and the three heating wires 27 are uniformly arranged around the steel wire rope. This arrangement allows the support beads 26 to be heated uniformly, allowing the support beads 26 to expand uniformly, and allowing the inner wall of the catheter 3 to be supported uniformly.
In order to realize the relative movement of the core rod beads 24, in this embodiment, as shown in fig. 2 and 4, the core rod beads 24 include a supporting portion 243 and a connecting portion 241, the supporting portion 243 is sleeved and fixed on the connecting portion 241, and two adjacent core rod beads 24 are connected by respective connecting portions 241; specifically, the outer peripheral surface of the connecting portion 241 is provided with a limiting portion, the outer peripheral surface of the connecting portion 241 is provided with a limiting groove, the connecting portion 241 is provided with a blocking piece 244 in a clamping manner, one end of the connecting portion 241 is provided with a ball head in a protruding manner, the other end of the connecting portion 241 is provided with a ball groove, the supporting portion 243 is sleeved on the connecting portion 241, the supporting portion 243 is clamped by the blocking piece 244 and the limiting portion, and when two adjacent core rod beads 24 are adjacent, the ball head of one core rod bead 24 is inserted into the ball groove of the other core rod bead 24, so that the two core rod beads 24 are movably connected.
In this embodiment, as shown in fig. 2 and fig. 4, the connection portion 241 includes two symmetrically arranged connection petals, where the connection petals include a hemispherical head and a hemispherical groove, and a positioning hole is further formed on the hemispherical head; when the bending inner support body is assembled, the bending inner support body comprises three core rod beads 24, wherein the three core rod beads 24 are respectively a first core rod bead, a second core rod bead and a third core rod bead, in order to facilitate assembly, the connecting part 241 of the first core rod bead is integrally formed, the ball groove of the first core rod bead is a connecting groove, and one end of the steel wire rope is inserted into the connecting groove and is tightly matched with the connecting groove; when the first core rod bead and the second core rod bead are connected, a ball head of the first core rod bead is placed in a hemispherical groove of a connecting plate of the second core rod bead, then two connecting petals of the second core rod bead are spliced, positioning pins 242 are inserted into positioning holes of the two connecting petals, so that the two connecting petals are spliced into a connecting part 241, then a supporting part 243 is sleeved on the connecting part 241, a baffle 244 is clamped in a limiting groove of the second core rod bead, and the connecting part 241 and the supporting part 243 of the second core rod bead are fixed; the second core rod bead and the third core rod bead are connected in the same manner.
In this embodiment, as shown in fig. 2 and fig. 4, two ends of the core rod main body 21 are respectively provided with a positioning groove and a connecting groove 211, a through hole is arranged between the positioning groove and the connecting groove 211, a connecting column 23 is inserted into the connecting groove 211, one end of the connecting column 23 is provided with a ball groove, the other end of the connecting column 23 is provided with a threaded hole, a bolt 22 is inserted into the positioning groove, and a threaded part of the bolt passes through the through hole and is in threaded connection with the threaded hole of the connecting column; the ball head of the third core rod ball is inserted into the ball groove of the connecting column 23, so that the bent inner support body is connected with the core rod main body 21.
Further, as shown in fig. 2 and 4, the connecting posts 23 are two-lobed, the two connecting posts 23 are spliced to clamp the ball head of the third core rod, and then the connecting posts 23 are inserted into the connecting grooves 211 of the core rod main body 21, the bolts are inserted into the positioning grooves, and the threaded portions of the bolts penetrate through the through holes to be in threaded connection with the threaded holes of the connecting posts.
The bending equipment for bending and forming the ultrathin wall conduit 3 comprises the mandrel for bending and forming the ultrathin wall conduit 3, and further comprises a wheel die holder 11, a clamping die 12 and a wheel die, wherein a linear first clamping groove 111 and a linear forming groove 112 are formed in the outer peripheral surface of the wheel die holder 11, a linear second clamping groove 121 is formed in the clamping die 12, the inner diameters of the first clamping groove 111, the forming groove 112 and the second clamping groove 121 are consistent, the first clamping groove 111 and the second clamping groove 121 are arranged face to face, the wheel die holder 11 and the clamping die 12 are installed on a workbench in an adjustable-interval mode, and the wheel die can move around the forming groove 112 of the wheel die holder 11.
In order to form a clamping mark on the outer wall of the conduit 3 when the conduit 3 is clamped by the device, in this embodiment, flexible gaskets are installed in the first clamping groove 111 and the second clamping groove 121.
A method for bending and forming an ultrathin wall conduit 3, which is applied to the bending equipment for bending and forming the ultrathin wall conduit 3; as shown in fig. 5, the bent catheter 3 includes a first straight portion 31, a first bent portion 32, a second straight portion 33, and a second bent portion 34, which are sequentially disposed, and as shown in fig. 1 to 5, a specific bending method of the catheter 3 is as follows:
when the first bending portion 32 is bent:
inserting the core rod into the guide tube 3, pulling the core rod main body 21 and the heating wire 27, and adjusting the position of the clamping inner support body in the guide tube 3 so that the clamping inner support body is positioned in the first straight line part 31 of the guide tube 3; then the heating wire 27 is electrified to release heat, and the supporting beads 26 are heated to expand and prop against the inner wall of the first straight line part 31; the heating wire 27 is then stopped, the clamping die 12 approaches the wheel die holder 11, clamping the first straight portion 31 of the catheter 3, wherein the plurality of support beads 26 are located between the first clamping groove 111 of the wheel die holder 11 and the second clamping groove 121 of the clamping die 12; the rear wheel die moves to push the guide pipe 3, so that the guide pipe 3 is attached to the forming groove 112 of the wheel die holder 11, and the first bending part 32 is formed, wherein the bending inner support body of the core rod is positioned at the inner side of the first bending part 32, and during the forming process of the first bending part 32, the bending inner support body deforms along with the guide pipe 3 and supports the inner wall of the first bending part 32;
when the second bending portion 34 is bent:
the clamping die 12 is far away from the wheel die holder 11 to loosen the guide tube 3, after the supporting beads 26 shrink after heat dissipation, the core rod main body 21 and the heating wire 27 are pulled, and the position of the clamping inner support body in the guide tube 3 is adjusted to enable the clamping inner support body to be positioned in the second linear part 33 of the guide tube 3; then the heating wire 27 is electrified to release heat, and the supporting beads 26 are heated to expand and prop against the inner wall of the second linear part 33; the heating wire 27 is then stopped, the clamping die 12 approaches the wheel die holder 11, clamping the second straight portion 33 of the catheter 3, wherein the plurality of support beads 26 are located between the first clamping groove 111 of the wheel die holder 11 and the second clamping groove 121 of the clamping die 12; and the wheel die moves to push the guide pipe 3, so that the guide pipe 3 is attached to the forming groove 112 of the wheel die holder 11, and the second bending part 34 is formed, wherein the bent inner support body of the core rod is positioned at the inner side of the second bending part 34, and during the forming process of the second bending part 34, the bent inner support body deforms along with the guide pipe 3 and supports the inner wall of the second bending part 34.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the invention.
Claims (10)
1. A core rod for bending and forming an ultrathin-wall catheter, which is characterized in that: the core rod comprises a core rod main body (21), a bent inner support body and a clamping inner support body which are connected in sequence; the bending inner support body comprises a plurality of core rod beads (24) which are sequentially connected, the two connected core rod beads (24) can swing relatively, and the core rod beads (24) are in clearance fit with the guide pipe (3); the clamping inner support body comprises a plurality of supporting beads (26) which are connected in sequence, the supporting beads (26) are all arranged on the same flexible connecting piece (25) in a penetrating mode, and heating wires (27) are also arranged on the supporting beads (26) in a penetrating mode; two ends of the bending inner support body are respectively connected with the flexible connecting piece (25) and the core rod main body (21); in a natural state, the supporting beads (26) are in clearance fit with the guide tube (3); after the heating wire (27) supplies heat for the supporting bead (26), the supporting bead (26) is heated to expand to support the inner wall of the conduit (3).
2. A mandrel for use in ultra-thin wall catheter bending as claimed in claim 1, wherein: the plurality of heating wires (27) are arranged on the supporting beads (26) uniformly, and the plurality of heating wires (27) are arranged on the supporting beads uniformly.
3. A mandrel for use in ultra-thin wall catheter bending as claimed in claim 1, wherein: the flexible connection (25) comprises a steel wire rope.
4. A mandrel for use in ultra-thin wall catheter bending as claimed in claim 1, wherein: two plugs are fixed on the flexible connecting piece (25), and the supporting beads (26) are positioned between the two plugs.
5. A mandrel for use in ultra-thin wall catheter bending as claimed in claim 1, wherein: the support beads (26) are tightly matched with the flexible connecting piece (25).
6. A mandrel for use in ultra-thin wall catheter bending as claimed in claim 1, wherein: the core rod beads (24) comprise a supporting part (243) and a connecting part (241), the supporting part (243) is sleeved and fixed on the connecting part (241), two adjacent core rod beads (24) are connected through the connecting parts (241) respectively, one end of the connecting part (241) is protruded with a ball head, the other end of the connecting part (241) is provided with a ball groove, and the two connected core rod beads (24) are connected through the ball head and the ball groove.
7. The mandrel for use in ultra-thin wall catheter bending as defined in claim 6, wherein: the limiting part is arranged on the outer peripheral surface of the connecting part (241) in a protruding mode, the limiting groove is formed in the outer peripheral surface of the connecting part (241), the baffle plate (244) is clamped on the connecting part (241), the supporting part (243) is sleeved on the connecting part (241), and the supporting part (243) is clamped by the baffle plate (244) and the limiting part.
8. The mandrel for use in ultra-thin wall catheter bending as defined in claim 6, wherein: the support portion (243) is formed by splicing two support petals, which are fixed by a positioning pin.
9. A bending apparatus for bending an ultra-thin wall catheter, characterized by: the bending device comprises a core rod for bending and forming an ultrathin-wall catheter according to any one of claims 1-8, and further comprises a wheel die holder (11), a clamping die (12) and a wheel die, wherein a linear first clamping groove (111) and an arc-shaped forming groove (112) are formed in the outer peripheral surface of the wheel die holder (11), a linear second clamping groove (121) is formed in the clamping die (12), the inner diameters of the first clamping groove (111), the forming groove (112) and the second clamping groove (121) are consistent, the first clamping groove (111) and the second clamping groove (121) are arranged face to face, the wheel die holder (11) and the clamping die (12) are mounted on a workbench in an interval-adjustable mode, and the wheel die can move around the forming groove (112) of the wheel die holder (11).
10. A method for bending and shaping an ultrathin-wall catheter, which is characterized by comprising the following steps of: use of a bending apparatus for ultra thin wall catheter bending according to claim 9, the bent catheter (3) comprising a first straight section (31), a first bent section (32), a second straight section (33) and a second bent section (34) arranged in that order;
the specific process is as follows:
when the first bending part (32) is bent:
inserting the core rod into the guide pipe (3), pulling the core rod main body (21) and the heating wire (27), and adjusting the position of the clamping inner support body in the guide pipe (3) to enable the clamping inner support body to be positioned in a first straight line part (31) of the guide pipe (3);
then the heating wire (27) is electrified to release heat, and the supporting beads (26) are heated to expand and are propped against the inner wall of the first straight line part (31);
then the heating wire (27) stops heating, the heating clamping die (12) approaches to the wheel die holder (11) to clamp the first linear part (31) of the guide pipe (3), and a plurality of supporting beads (26) are positioned between the first clamping groove (111) of the wheel die holder (11) and the second clamping groove (121) of the clamping die (12);
then the wheel die moves to push the guide pipe (3) so that the guide pipe (3) is attached to a forming groove (112) of the wheel die holder (11) to form a first bending part (32), wherein a bending inner support body of the core rod is positioned at the inner side of the first bending part (32), and the bending inner support body deforms along with the guide pipe (3) and supports the inner wall of the first bending part (32) in the forming process of the first bending part (32);
when the second bending part (34) is bent:
the clamping die (12) is far away from the wheel die holder (11) to loosen the guide pipe (3), after the supporting beads (26) shrink after heat dissipation, the core rod main body (21) and the heating wire (27) are pulled, and the position of the clamping inner support body in the guide pipe (3) is adjusted to enable the clamping inner support body to be located in a second linear part (33) of the guide pipe (3);
then the heating wire (27) is electrified to release heat, and the supporting beads (26) are heated to expand and prop against the inner wall of the second linear part (33);
then the heating wire (27) stops heating, the heating clamping die (12) approaches to the wheel die holder (11) to clamp the second linear part (33) of the guide pipe (3), and a plurality of supporting beads (26) are positioned between the first clamping groove (111) of the wheel die holder (11) and the second clamping groove (121) of the clamping die (12);
and then the wheel die moves to push the guide pipe (3) so that the guide pipe (3) is attached to a forming groove (112) of the wheel die holder (11) to form a second bending part (34), wherein the bent inner support body of the core rod is positioned at the inner side of the second bending part (34), and in the process of forming the second bending part (34), the bent inner support body deforms along with the guide pipe (3) and supports the inner wall of the second bending part (34).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310942595.1A CN116900118A (en) | 2023-07-28 | 2023-07-28 | Core rod, pipe bending device and method for ultrathin-wall pipe bending forming |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310942595.1A CN116900118A (en) | 2023-07-28 | 2023-07-28 | Core rod, pipe bending device and method for ultrathin-wall pipe bending forming |
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| Publication Number | Publication Date |
|---|---|
| CN116900118A true CN116900118A (en) | 2023-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310942595.1A Pending CN116900118A (en) | 2023-07-28 | 2023-07-28 | Core rod, pipe bending device and method for ultrathin-wall pipe bending forming |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117259521A (en) * | 2023-11-14 | 2023-12-22 | 成都鑫晨航空科技有限公司 | Pipe bending device for aviation pipeline |
-
2023
- 2023-07-28 CN CN202310942595.1A patent/CN116900118A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117259521A (en) * | 2023-11-14 | 2023-12-22 | 成都鑫晨航空科技有限公司 | Pipe bending device for aviation pipeline |
| CN117259521B (en) * | 2023-11-14 | 2024-02-06 | 成都鑫晨航空科技有限公司 | Pipe bending device for aviation pipeline |
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