CN113909385B - Production mold and production method of corrugated pipe with uniform wall thickness - Google Patents
Production mold and production method of corrugated pipe with uniform wall thickness Download PDFInfo
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- CN113909385B CN113909385B CN202111186949.1A CN202111186949A CN113909385B CN 113909385 B CN113909385 B CN 113909385B CN 202111186949 A CN202111186949 A CN 202111186949A CN 113909385 B CN113909385 B CN 113909385B
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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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
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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
- B21D15/00—Corrugating tubes
- B21D15/04—Corrugating tubes transversely, e.g. helically
- B21D15/06—Corrugating tubes transversely, e.g. helically annularly
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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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/18—Lubricating, e.g. lubricating tool and workpiece simultaneously
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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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/20—Making tools by operations not covered by a single other subclass
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
The invention provides a production die of a corrugated pipe with uniform wall thickness and a production method of the corrugated pipe, wherein the die comprises an inner roller and an outer roller, the inner roller can feed along the radial direction and is used for extruding a pipe blank, a first contact area of the side surface of the inner roller and the pipe blank and a first arc surface of the inner roller are respectively provided with a convex body microstructure, and the inner surface of the pipe blank forms a hard tissue collection area through the convex body microstructure, so that materials in other areas can flow around the hard tissue collection area in the extrusion process of the pipe blank; and the side surface of the outer roller, a second contact area of the tube blank and a second arc surface of the outer roller are respectively provided with a concave microstructure, and an oil film is formed on the outer surface of the tube blank through the concave microstructures. The invention can improve the wall thickness uniformity of the corrugated pipe formed by rolling, thereby improving the fatigue life, rigidity and stability of the corrugated pipe.
Description
Technical Field
The invention relates to the field of corrugated pipe production and processing, in particular to a mold and a method for producing corrugated pipes with uniform wall thickness.
Background
The metal corrugated pipe has wide application and is applied to the industries of petrifaction, metallurgy, aviation, automobile and the like. Roll forming is a common method of manufacturing metal corrugated tubing. The formation of metal bellows involves large-area metal flow and plastic deformation, which presents a common and prominent technical challenge: the thickness of the pipe wall is not uniform, which is a cause of affecting the rigidity, stability and fatigue resistance of the corrugated pipe. Meanwhile, the die may also fail due to wear, deformation, cracking, and the like.
Aiming at the problem of uneven pipe wall thickness, the traditional coping method is to optimize process parameters such as a rotating speed, a rolling reduction, a pass, an internal pressure and a loading path of axial feeding or mold sizes such as a roller diameter, a mold piece fillet radius and a mold piece interval, but the requirement of performance indexes of the metal corrugated pipe cannot be met. For the problem of mold failure, the prior art applies various surface treatment methods to the mold surface besides selecting high-performance materials, but has more or less defects in the aspects of application range, process controllability, repeatability, processing efficiency, cost and the like.
The prior art discloses a flexible forming die for a corrugated pipe, which comprises an upper die and a lower die, wherein a waveform forming cavity of the corrugated pipe is formed by an upper die cavity and a lower die cavity, and the waveform forming cavity consists of a rectangular female die cavity and an arc-shaped male die cavity. The prior art discloses a bellows forming die, which comprises an upper die plate and a lower die plate, wherein a semicircular convex ring and a semicircular concave ring are respectively and correspondingly arranged in an upper die cavity and a lower die cavity. But the bellows produced is not uniform in thickness.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a mold and a method for producing corrugated pipes with uniform wall thickness, so as to improve the wall thickness uniformity of the corrugated pipes formed by rolling, further improve the fatigue life, rigidity and stability of the corrugated pipes, simultaneously enable the material of the surface layer of the mold to be phase-change hardened by the heat effect of laser processing, and prolong the service life of the mold.
The present invention achieves the above-described object by the following means.
A production mold of corrugated pipes with uniform wall thickness comprises an inner roller and an outer roller, wherein the inner roller can feed along the radial direction and is used for extruding a pipe blank, a first contact area of the side surface of the inner roller and the pipe blank and a first arc surface of the inner roller are respectively provided with a convex microstructure, and the inner surface of the pipe blank is formed into a hard tissue concentrated area through the convex microstructures, so that materials in other areas can flow around the hard tissue concentrated area in the pipe blank extrusion process; and the side surface of the outer roller, a second contact area of the tube blank and a second arc surface of the outer roller are respectively provided with a concave microstructure, and an oil film is formed on the outer surface of the tube blank through the concave microstructures.
Further, the first contact area is a torus, and the width of the torus is the maximum radial feeding amount of the inner roller; dividing a first contact area into a first outer edge surface and a first inner edge surface by taking a concentric circle with a radius of a half sum of the radii of the inner ring and the outer ring of the torus as a boundary; the first outer edge surface is positioned outside the first inner edge surface; the distribution density of the convex body microstructures in the first inner edge surface is less than that of the convex body microstructures in the first outer edge surface and the first arc surface.
Further, the area density of the convex microstructure in the first inner edge surface is 10% -30%; the area density of the convex body microstructures in the first outer edge surface and the first arc surface is 30-60%; the height H of the convex microstructure is 10-30 μm, and the diameter D of the convex microstructure is 30-500 μm.
Further, the second contact area is a torus, and the width of the torus is the maximum radial feeding amount of the inner roller; dividing a second contact area into a second outer edge surface and a second inner edge surface by taking a concentric circle with a radius of a half sum of the radii of the inner ring and the outer ring of the torus as a boundary; the second outer edge surface is positioned outside the second inner edge surface; the distribution density of the concave microstructures in the second inner edge surface is less than the distribution density of the concave microstructures in the second outer edge surface and the second arc surface.
Further, the area density of the concave microstructure in the second inner edge surface is 10% -30%; the area density of the concave microstructure in the second outer edge surface and the second arc surface is 30-60%; the height h of the concave microstructure is 4-20 μm, and the diameter d of the concave microstructure is 30-500 μm.
Further, the convex microstructure is in a crater shape or a W shape or a spherical crown shape, and the concave microstructure is in a pit shape or a groove shape.
A method for producing corrugated pipe with uniform wall thickness comprises the following steps:
processing a production mold of the corrugated pipe with uniform wall thickness: forming a convex microstructure on the first contact area and the surface of the first arc surface by laser processing; forming a concave microstructure on the second contact area and the surface of the second arc surface by laser processing;
respectively enabling an inner roller and an outer roller to be tangent to the pipe blank, and driving the pipe blank to rotate through the inner roller and the outer roller; the inner roller wheel feeds in the radial direction, and lubricating oil is added between the inner roller wheel and the tube blank and between the outer roller wheel and the tube blank, so that the tube blank forms a wave crest.
The invention has the beneficial effects that:
according to the production mold of the corrugated pipe with uniform wall thickness, disclosed by the invention, the convex body microstructures are processed on the surfaces of the first contact area and the first arc surface, and the concave body microstructures are processed on the surfaces of the second contact area and the second arc surface, so that in the friction process of the pipe blank and the mold, due to the fact that hard particles on the surface of a friction pair extrude the solid surface and the material is lost due to movement along the surface, abrasive particles are formed. During rolling forming, lubricating oil is added between the pipe blank and the die. The arc surface of the outer roller and the concave microstructure of the contact area between the side surface of the outer roller and the pipe blank can store abrasive particles and lubricating oil, so that a thick oil film is formed between the die and the plate, and the contact area between the die and the plate is reduced. Therefore, the material flow is promoted by the arc surface of the outer roller and the concave microstructure of the contact area of the side surface of the outer roller and the tube blank. In addition, the arc surface of the inner roller and the convex microstructure of the contact area of the side surface of the inner roller and the tube blank act around the surface layer of the plate to form a hard tissue collection area, and materials in other areas flow around the area, so that the flow direction of the materials is changed. The force applied by the convex body microstructure to the plate is divided into compressive stress and tangential force, the compressive stress performs a pinning effect on the surface layer tissue of the plate, and the tangential force hinders the flow of the material. Therefore, the arc surface of the inner roller and the convex microstructure of the contact area of the side surface of the inner roller and the tube blank have retarding effect on the material. When the composite microstructure die is used for roll forming, the wall thickness uniformity of the corrugated pipe is improved by 10-30%, and further the fatigue life, rigidity and stability of the corrugated pipe are improved. Meanwhile, the heat effect of laser processing enables the material of the surface layer of the die to be hardened in a phase change manner, and the service life of the die is prolonged.
Drawings
FIG. 1 is a schematic view of a mold for producing a corrugated pipe having a uniform wall thickness according to the present invention.
Fig. 2 is an enlarged view of a in fig. 1.
Fig. 3 is an enlarged view of B in fig. 1.
In the figure:
1-tube blank; 2-inner rollers; 3-outer rollers; 4-1-a first arc surface; 4-2-a first contact region; 5-1-a second arc surface; 5-2-a second contact region; 6-convex microstructure; 7-abrasive grains; 8-a hardened layer; 9-concave microstructure; 10-lubricating oil; h-bump microstructure height; d-convex microstructure diameter; h-depth of the concave microstructure; d-concave microstructure diameter.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
As shown in figure 1, the mould for producing the corrugated pipe with uniform wall thickness comprises an inner roller 2 and an outer roller 3, and the assembly relationship of the inner roller 2 and the outer roller 3 is the prior structure and is not described in detail. The inner roller 2 can be fed along the radial direction and is used for extruding the tube blank 1, the side surface of the inner roller 2, a first contact area 4-2 of the tube blank 1 and a first arc surface 4-1 of the inner roller 2 are respectively provided with a convex microstructure 6, the inner surface of the tube blank 1 is formed into a hard tissue concentrated area through the convex microstructure 6, and materials in other areas can flow around the hard tissue concentrated area in the extrusion process of the tube blank 1; and the side surface of the outer roller 3, a second contact area 5-2 of the tube blank 1 and a second arc surface 5-1 of the outer roller 3 are respectively provided with a concave microstructure 9, and an oil film is formed on the outer surface of the tube blank 1 through the concave microstructures 9. The convex microstructure 6 is in a crater shape or a W shape or a spherical crown shape, and the concave microstructure 9 is in a pit shape or a groove shape.
As shown in fig. 2, the first contact area 4-2 is a torus, and the width of the torus is the maximum radial feed amount of the inner roller 2; dividing the first contact area 4-2 into a first outer edge surface and a first inner edge surface by taking a concentric circle with a radius of a half of the sum of the radii of the inner ring and the outer ring of the torus as a boundary; the first outer edge surface is positioned outside the first inner edge surface; the distribution density of the convex microstructure 6 in the first inner edge surface is less than that of the convex microstructure 6 in the first outer edge surface and the first arc surface 4-1. The area density of the convex microstructure 6 in the first inner edge surface is 10% -30%; the area density of the convex microstructure 6 in the first outer edge surface and the first arc surface 4-1 is 30-60%; the height H of the convex microstructure 6 is 10-30 μm, and the diameter D of the convex microstructure 6 is 30-500 μm.
As shown in fig. 3, the second contact area 5-2 is a torus, and the width of the torus is the maximum radial feed amount of the inner roller 2; dividing a second contact area 5-2 into a second outer edge surface and a second inner edge surface by taking a concentric circle with a radius of a half of the sum of the radii of the inner ring and the outer ring of the torus as a boundary; the second outer edge surface is positioned outside the second inner edge surface; the distribution density of the concave microstructure 9 in the second inner edge surface is less than that of the concave microstructure 9 in the second outer edge surface and the second arc surface 5-1. The area density of the concave microstructure 9 in the second inner edge face is 10% -30%; the area density of the concave microstructure 9 in the second outer edge surface and the second arc surface 5-1 is 30-60%; the height h of the concave microstructure 9 is 4-20 μm, and the diameter d of the concave microstructure 9 is 30-500 μm.
A method for producing corrugated pipe with uniform wall thickness comprises the following steps:
the first step is as follows: the fiber laser is adopted, laser parameters such as laser power 40-120W, pulse width 200-1600 mus, defocusing amount 0mm and the like are adjusted, pulse laser with high energy density and high repetition frequency irradiates the first contact area 4-2 and the first arc surface 4-1 of the inner roller 2, and auxiliary gas is blown, so that the convex body microstructures 6 with different densities are processed on the first contact area 4-2 and the first arc surface 4-1 of the inner roller 2.
The geometrical parameters of the convex body microstructure 6 after laser processing are as follows: the height H of the convex microstructure 6 is 10-30 μm, the diameter D of the convex microstructure 6 is 30-500 μm, and the area density of the convex microstructure 6 in the first inner edge surface is 10-30%; the area density of the convex microstructure 6 in the first outer edge surface and the first arc surface 4-1 is 30-60%.
The second step is that: and (3) adjusting laser parameters such as laser power of 20-90W, pulse width of 2500-19000 mu s and the like by adopting a fiber laser, so that pulse laser with high energy density and high repetition frequency irradiates the second contact area 5-2 and the second arc surface 5-1 of the outer roller 3, and blows auxiliary gas, thereby processing the concave microstructure 9 with unequal density in the second contact area 5-2 and the second arc surface 5-1 of the outer roller 3.
The geometrical parameters of the concave microstructure 9 after laser processing are as follows: the depth h of the concave microstructure 9 is 4-20 μm, the diameter d of the concave microstructure 9 is 30-500 μm, and the area density of the concave microstructure 9 in the second inner edge surface is 10% -30%; the area density of the concave microstructure 9 in the second outer edge surface and the second arc surface 5-1 is 30-60%.
The third step: before roll forming, the inner roller 2 and the outer roller 3 are tangent to the tube blank 1, and the outer roller 3 is symmetrical about the inner roller 2. During roll forming, the inner roller 2 and the outer roller 3 drive the pipe blank 1 to rotate, the inner roller 2 feeds outwards, and lubricating oil is added between the inner roller and the outer roller and between the pipe blank and the pipe blank. In the process of rubbing the tube blank and the inner and outer rollers, abrasive grains 7 are formed due to the loss of material caused by the hard particles on the surface of the rubbing pair extruding against the solid surface and moving along the surface. Abrasive grains 7 and lubricating oil 10 are stored in the concave microstructure 9 of the second circular arc surface 5-1, the second outer edge surface and the second inner edge surface, so that a thick oil film is formed between the second circular arc surface 5-1, the second outer edge surface and the second inner edge surface and the tube blank 1, the contact area among the second circular arc surface 5-1, the second outer edge surface and the second inner edge surface is also reduced, and material flowing is promoted. The convex microstructure 6 of the first arc surface 4-1, the first outer edge surface and the first inner edge surface acts around the surface layer of the tube blank 1 to form a hard tissue collection area, and materials in other areas of the tube blank 1 flow around the hard tissue collection area; the force applied by the convex body microstructure 6 to the tube blank 1 is divided into a compressive stress and a tangential force, the compressive stress performs a pinning effect on the surface layer tissue of the tube blank 1, and the tangential force hinders the material flow.
The fourth step: after the rolling forming is finished, the wall thickness uniformity of the corrugated pipe is improved by 10-30%, and further the fatigue life, rigidity and stability of the corrugated pipe are improved. Meanwhile, the heat effect of laser processing enables the material of the surface layer of the die to be hardened in a phase change mode, and the service life of the die is prolonged. In addition, the laser processing also has the advantages of high efficiency, precision, controllability, no pollution to the environment, low cost and the like.
It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (6)
1. A mould for the production of corrugated tubing of uniform wall thickness, said mould comprising an inner roller (2) and an outer roller (3), said inner roller (2) being radially feedable for extruding a tube blank (1),
the side surface of the inner roller (2), a first contact area (4-2) of the tube blank (1) and a first arc surface (4-1) of the inner roller (2) are respectively provided with a convex microstructure (6), and the inner surface of the tube blank (1) forms a hard tissue collection area through the convex microstructures (6), so that materials in other areas can flow around the hard tissue collection area in the extrusion process of the tube blank (1);
the side surface of the outer roller (3), a second contact area (5-2) of the tube blank (1) and a second arc surface (5-1) of the outer roller (3) are respectively provided with a concave microstructure (9), and an oil film is formed on the outer surface of the tube blank (1) through the concave microstructures (9);
the first contact area (4-2) is a torus, and the width of the torus is the maximum radial feeding amount of the inner roller (2); dividing a first contact area (4-2) into a first outer edge surface and a first inner edge surface by taking a concentric circle with a radius of a half sum of the radii of the inner ring and the outer ring of the torus as a boundary; the first outer edge surface is positioned outside the first inner edge surface; the distribution density of the convex body microstructures (6) in the first inner edge surface is smaller than that of the convex body microstructures (6) in the first outer edge surface and the first arc surface (4-1).
2. The mold for producing corrugated pipe with uniform wall thickness according to claim 1, wherein the area density of the convex microstructure (6) in the first inner peripheral surface is 10-30%; the area density of the convex microstructure (6) in the first outer edge surface and the first arc surface (4-1) is 30-60%; the height H of the convex microstructure (6) is 10-30 μm, and the diameter D of the convex microstructure (6) is 30-500 μm.
3. Mould for the production of corrugated tubing of uniform wall thickness according to claim 1, characterised in that said second contact area (5-2) is a torus having a width that is the maximum radial feed of the inner rollers (2); dividing a second contact area (5-2) into a second outer edge surface and a second inner edge surface by taking a concentric circle with a radius being half of the sum of the radii of the inner ring and the outer ring of the torus; the second outer edge surface is positioned on the outer side of the second inner edge surface; the distribution density of the concave microstructures (9) in the second inner edge surface is smaller than the distribution density of the concave microstructures (9) in the second outer edge surface and the second arc surface (5-1).
4. The production mold for the corrugated pipe with the uniform wall thickness as claimed in claim 3, wherein the area density of the concave microstructure (9) in the second inner edge face is 10% -30%; the area density of the concave microstructure (9) in the second outer edge surface and the second arc surface (5-1) is 30-60%; the height h of the concave microstructure (9) is 4-20 μm, and the diameter d of the concave microstructure (9) is 30-500 μm.
5. Mould for the production of corrugated tubing of uniform wall thickness according to any of claims 1 to 4, wherein the microstructure of protrusions (6) is one of crater-like or W-like or spherical crown-like and the microstructure of recesses (9) is one of crater-like or groove-like.
6. A method for producing corrugated pipes with uniform wall thickness is characterized by comprising the following steps:
a production mold for processing a corrugated pipe with a uniform wall thickness according to any one of claims 1 to 4: forming a convex microstructure (6) on the surfaces of the first contact area (4-2) and the first arc surface (4-1) by laser processing; forming a concave microstructure (9) on the surfaces of the second contact area (5-2) and the second arc surface (5-1) by laser processing;
respectively enabling the inner roller (2) and the outer roller (3) to be tangent to the tube blank (1), and driving the tube blank (1) to rotate through the inner roller (2) and the outer roller (3); the inner roller (2) is fed in the radial direction, and lubricating oil is added between the inner roller (2), the outer roller (3) and the tube blank (1) at the same time, so that the tube blank (1) forms wave crests.
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