CN114378161A - Metal pipe bending forming method - Google Patents
Metal pipe bending forming method Download PDFInfo
- Publication number
- CN114378161A CN114378161A CN202210062193.8A CN202210062193A CN114378161A CN 114378161 A CN114378161 A CN 114378161A CN 202210062193 A CN202210062193 A CN 202210062193A CN 114378161 A CN114378161 A CN 114378161A
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- Prior art keywords
- pipe
- treatment
- bending
- blank
- melting
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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
- B21D9/08—Bending tubes using mandrels or the like in press brakes or between rams and anvils or abutments; Pliers with forming dies
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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
- 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
Abstract
The invention provides a metal pipe bending forming method, relates to the technical field of pipeline processing, and mainly aims to solve the problem that a pipeline is easy to ovalize or collapse and wrinkle during pipe bending processing in the prior art. The metal pipe bending forming method comprises the following steps: obtaining low-melting-point metal, and heating the low-melting-point metal to be molten for later use; pouring liquid low-melting-point metal into a tube blank needing bending treatment and sealing, wherein the liquid low-melting-point metal is cooled and solidified to form a core body mold positioned in the tube blank; preheating the tube blank provided with the core body die; placing the pipe blank subjected to preheating treatment into a pipe bending machine for hot bending treatment; and taking the pipe blank subjected to the hot bending treatment off the pipe bender and carrying out demolding treatment to take out the liquid low-melting-point metal in the pipe blank. The invention provides a metal pipe bending forming method which can reduce or solve the problem that a pipeline is easy to damage when being bent.
Description
Technical Field
The invention relates to the technical field of pipeline processing, in particular to a metal pipe bending forming method.
Background
The existing pipe bending process mainly comprises bending, pushing bending, bending and the like, large-size coreless metal pipelines (phi more than 50) bent by adopting the pipe bending process schemes inevitably have large ovality and reduction of wall thickness, and simultaneously, the inner arc area has large bidirectional pressure stress, so that the buckling phenomenon of a destabilization area often occurs, and even more, local cracking occurs. In order to overcome the defects of over-standard ellipticity and local instability, in the bending process, the tube blank is supported by filling materials in the tube blank. The common filling materials in the prior art are mostly sand, rosin and other materials. The filler has the problem of time consumption in filling when in use, and also easily causes the problem of scratches on the inner surface of the pipe wall, and is not easy to operate, and the quality of the bent pipeline is poor.
In order to solve the above problems, it is necessary to develop a novel method for bending a metal pipe.
Disclosure of Invention
The invention aims to provide a metal pipe bending forming method to solve the technical problem that defects are easily generated on a bent part of a metal pipeline in the prior art. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a metal pipe bending forming method, which comprises the following steps:
obtaining low-melting-point metal, and heating the low-melting-point metal to be molten for later use;
pouring liquid low-melting-point metal into a tube blank needing bending treatment and sealing, wherein the liquid low-melting-point metal is cooled and solidified to form a core body mold positioned in the tube blank;
preheating the tube blank provided with the core body die;
placing the pipe blank subjected to preheating treatment into a pipe bending machine for hot bending treatment;
and taking the pipe blank subjected to the hot bending treatment off the pipe bender and carrying out demolding treatment to take out the liquid low-melting-point metal in the pipe blank.
On the basis of the technical scheme, the invention can be further improved as follows.
As a further improvement of the invention, the method also comprises a cooling step, wherein the pipe blank after the hot bending treatment needs to be subjected to demoulding treatment after standing and cooling.
As a further improvement of the invention, the method also comprises orthopedic treatment.
As a further improvement of the invention, the orthopedic treatment comprises surface cutting of the tube blank.
As a further improvement of the invention, the method also comprises a shaping treatment, wherein the shaping treatment comprises a shaping treatment and an annealing treatment.
As a further improvement of the invention, the shaping comprises the step of putting the tube blank into a shaping tool for shaping treatment.
As a further improvement of the invention, the pipe bending machine further comprises a processing mould, and the pipe blank after the preheating treatment is placed in the processing mould and then is placed in the pipe bending machine.
As a further improvement of the invention, a temperature sensor is arranged in the processing mould.
As a further improvement of the invention, the filling rate of the core die in the sealing area of the tube blank is not less than 80%.
Compared with the prior art, the metal pipe bending method provided by the preferred embodiment of the invention utilizes low-melting-point metal as a core body die as a support for bending a pipe blank, and when the pipe blank is bent, the core body die can help reduce the tendency of wrinkling of the pipe wall and distortion of the section of the pipe body, is particularly suitable for bending and forming thin-wall pipe fittings, and enables the appearance quality of the bent pipe obtained by processing to be uniform; in addition, the low-melting-point metal is easy to obtain and can be repeatedly used for many times, so that the processing cost of the bent pipe can be effectively reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the bending method of the present invention.
Wherein: 1. a pipe blank; 2. and (4) a core body die.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
The invention provides a metal pipe bending forming method, which utilizes the characteristics of low-temperature solidification and high-temperature melting of low-melting-point metal to enable the metal pipe to be used as a core body mould 2 of a pipe blank 1, and plays a better supporting role in the pipe blank 1 subjected to pipe bending treatment, thereby reducing the possibility of pipe wall wrinkling and pipe body section distortion, improving the processing quality and the processing effect of the pipe blank 1, and simultaneously effectively overcoming the defect that the traditional filler is easy to damage the inner wall of the pipe.
As shown in fig. 1, the present invention provides a method for bending a metal tube, comprising the steps of: obtaining low-melting-point metal, and heating the low-melting-point metal to be molten for later use; pouring liquid low-melting-point metal into the tube blank 1 to be bent and sealing, and cooling and solidifying the liquid low-melting-point metal to form a core body mold 2 positioned in the tube blank 1; preheating the tube blank 1 provided with the core body die 2; placing the pipe blank 1 after the preheating treatment into a pipe bending machine for hot bending treatment; the hot-bent pipe blank 1 is removed from the pipe bender and subjected to a mold release treatment to take out the liquid low-melting-point metal located in the pipe blank 1.
In order to fix the liquid low-melting-point metal on the corresponding position in the tube blank 1, one side of a deformation area of the tube blank 1 is arranged to be closed, after the liquid low-melting-point metal is poured into the tube blank 1, the other side of the deformation area of the tube blank 1 is sealed by a flange or other structures, so that the liquid metal used as the core body mold 2 is fixed in the corresponding position of the tube blank 1, and the core body mold 2 can play a role in supporting the liquid low-melting-point metal in the tube bending process.
It is to be noted that the specific melting temperature of the low melting point metal needs to be determined according to the physical properties of the metal. The low melting point metal can be a single metal or an alloy material. The low melting point is a metal having a melting point of not more than 200 ℃, for example, a melting point of about 80 ℃, or a melting point of about 170 ℃. Common low melting point metals include lead, tin alloy, and the like (the melting point of tin is 32 ℃). The type of the specifically selected low-melting-point metal can be selected and formulated as required. The low-melting-point metal has the advantages of convenient acquisition, random formula, more material selectivity and low cost.
As an optional embodiment, the method further comprises a cooling step, wherein the tube blank 1 after the hot bending treatment is subjected to a demolding treatment after standing and cooling, so that the low-melting-point metal in the tube blank 1 in a molten state is discharged, the tube blank 1 can be further treated, and the discharged low-melting-point metal can be reused.
As an optional embodiment, the method further comprises a reshaping treatment, wherein the reshaping treatment can be performed before demolding or after demolding. The reshaping treatment comprises surface cutting of the tube blank 1.
The parts need to be properly shaped to improve and stabilize the performance of the product. As an alternative embodiment, the shaping process includes a shaping process and an annealing process, wherein the shaping process requires a shaping tool, and the shaping process is performed by placing the tube blank 1 into the shaping tool.
As an optional embodiment, the pipe bending machine further comprises a processing die, and the pipe blank 1 after the preheating treatment is placed in the processing die and then is placed in the pipe bending machine. The tube blank 1 can obtain better processing effect through the processing die. In addition, a temperature sensor is arranged in the processing die, and the temperature sensor can monitor the temperature of the tube blank 1 and/or the temperature of oil in the processing die, so that the normal operation of the hot bending process is ensured.
As an alternative embodiment, the filling rate of the core die 2 in the sealing area of the tube blank 1 is not less than 80%. This filling rate can provide a good support effect for the wall of the tube blank 1.
The specific processing flow of the method is as follows:
1. preparing a core body die 2:
firstly, heating low-melting-point metal capable of being solidified at low temperature to the melting point of the metal in a corresponding container to prepare liquid metal for later use;
secondly, one end in the tube blank 1 is closed according to the length of a deformation area of the tube blank 1, then the liquid metal prepared in the step is filled into the tube blank 1, and the liquid metal is solidified to form a solid core body die 2 through cooling;
and thirdly, sealing the other end of the tube blank 1 through a flange or other structures, and placing the tube blank 1 for the next step of treatment.
2. Hot bending and forming:
preheating treatment, namely preheating an oven to a certain temperature, putting the tube blank 1 prepared in the previous step into the oven, and keeping the tube blank 1 stable after the temperature of the tube blank 1 is heated to a certain degree, so as to realize preheating treatment of the tube blank 1.
The temperature is selected within the range that the internal modulus of the material of the tube blank 1 can be relatively reduced, so that the tube blank 1 can be effectively bent.
And secondly, pipe bending, namely heating the mold temperature controller according to set parameters, putting the pipe subjected to preheating treatment into a processing mold after the temperature of the mold temperature controller is stable, starting pipe bending according to the program setting of the pipe bending machine, and stopping operation according to the setting of the machine after the pipe bending is finished.
The processing die can monitor the temperature of the pipe blank 1 and the oil temperature in the processing die in the whole process of hot bending of the pipe blank 1, and the normal operation of the hot bending process is ensured.
It should be noted that the heating time of the tube blank 1 is specifically determined according to the tube diameter and the wall thickness. In addition, the bending degree of the tube blank 1 is generally set to be slightly greater than the desired bending degree.
And thirdly, cooling, wherein the temperature of the tube blank 1 is gradually reduced to a certain value in a standing mode, and the specific cooling realization needs to be determined according to the size and the wall thickness of the pipeline. When the temperature of the tube blank 1 is reduced to a state that the modulus in the tube blank 1 is relatively high and the core die 2 in the tube blank 1 is in a liquid state. Once the cooling of the tube blank 1 is completed, the tube blank 1 in the bent state can be removed from the tube bender.
And fourthly, demolding, cutting the surface of the hot-bent pipe blank 1, and then taking out the liquid metal in the pipe blank 1.
Specifically, the tube blank 1 can be placed into an oven or water to protect the two ends of the tube blank 1, so that metal can be conveniently taken out, and the liquid metal taken out can be reused.
Moulding treatment
The tube blank 1 part processed by the above processing steps needs to be subjected to appropriate shaping treatment to improve and stabilize the performance of the product. The shaping treatment mainly comprises tool shaping and/or annealing treatment.
After the bent pipe blank 1 obtained through the treatment is taken out of the processing die, the bent pipe blank needs to be immediately placed into a shaping tool for shape keeping, and then the bent pipe blank needs to be accurately cut according to a pipe fitting pattern.
The annealing process is a prior art process and is not described herein.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. The metal tube bending forming method is characterized by comprising the following steps:
obtaining low-melting-point metal, and heating the low-melting-point metal to be molten for later use;
pouring liquid low-melting-point metal into a tube blank needing bending treatment and sealing, wherein the liquid low-melting-point metal is cooled and solidified to form a core body mold positioned in the tube blank;
preheating the tube blank provided with the core body die;
placing the pipe blank subjected to preheating treatment into a pipe bending machine for hot bending treatment;
and taking the pipe blank subjected to the hot bending treatment off the pipe bender and carrying out demolding treatment to take out the liquid low-melting-point metal in the pipe blank.
2. The metal pipe bending method according to claim 1, further comprising a cooling step of performing a mold releasing treatment after the pipe blank subjected to the hot bending treatment is subjected to standing and cooling.
3. The metal tube bending method according to claim 1, further comprising an orthopedic treatment.
4. A method of bend forming a metal tube according to claim 3, wherein the orthopedic treatment comprises tube stock surface cutting.
5. The metal tube bending method according to claim 4, further comprising a shaping process, wherein the shaping process comprises a sizing and an annealing process.
6. The metal tube bending method according to claim 5, wherein the shaping comprises placing the tube blank into a shaping tool for shaping.
7. The method according to claim 1, further comprising a working mold, wherein the pipe blank after the preheating treatment is placed in the pipe bending machine after being placed in the working mold.
8. The method according to claim 7, wherein a temperature sensor is provided in the processing mold.
9. A metal tube bending forming method according to claim 1, wherein a filling rate of the core die in the sealed area of the tube blank is not less than 80%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210062193.8A CN114378161A (en) | 2022-01-19 | 2022-01-19 | Metal pipe bending forming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210062193.8A CN114378161A (en) | 2022-01-19 | 2022-01-19 | Metal pipe bending forming method |
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| Publication Number | Publication Date |
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| CN114378161A true CN114378161A (en) | 2022-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210062193.8A Pending CN114378161A (en) | 2022-01-19 | 2022-01-19 | Metal pipe bending forming method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1709607A (en) * | 2005-07-27 | 2005-12-21 | 清华大学 | Magnesium-alloy tube hot-bending method and equipment thereof |
| CN103143622A (en) * | 2013-02-26 | 2013-06-12 | 武汉理工大学 | Medium forming method for improving forming property of thick-wall metal pipe fittings |
| CN103920765A (en) * | 2014-04-03 | 2014-07-16 | 南京航空航天大学 | Thin-walled metal tube bending and forming method |
| CN109807567A (en) * | 2019-03-19 | 2019-05-28 | 南昌航空大学 | A method of improving 1D and following small-bend radius pipe bend straight end length |
| US20190224736A1 (en) * | 2018-01-22 | 2019-07-25 | Nanchang Hangkong University (NCHU) | Differential temperature push bending method and device for tube with small bending radius |
-
2022
- 2022-01-19 CN CN202210062193.8A patent/CN114378161A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1709607A (en) * | 2005-07-27 | 2005-12-21 | 清华大学 | Magnesium-alloy tube hot-bending method and equipment thereof |
| CN103143622A (en) * | 2013-02-26 | 2013-06-12 | 武汉理工大学 | Medium forming method for improving forming property of thick-wall metal pipe fittings |
| CN103920765A (en) * | 2014-04-03 | 2014-07-16 | 南京航空航天大学 | Thin-walled metal tube bending and forming method |
| US20190224736A1 (en) * | 2018-01-22 | 2019-07-25 | Nanchang Hangkong University (NCHU) | Differential temperature push bending method and device for tube with small bending radius |
| CN109807567A (en) * | 2019-03-19 | 2019-05-28 | 南昌航空大学 | A method of improving 1D and following small-bend radius pipe bend straight end length |
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