Reducer pipe bending die hole dynamic online adjusting method based on rotary bending composite technology

Abstract

The invention relates to the technical field of variable-diameter pipe spinning composite processes, and particularly discloses a variable-diameter pipe bending die hole dynamic online adjusting method based on a spinning composite process, which is used for realizing online regulation and control on the size of the hole diameter of a bending die under the existing process technology. Reducer pipe spinning forming is achieved through the composite technology of pipe spinning and bent pipe forming, track amplitude definition is conducted on a necking spinning roller through the Archimedes spiral equation, and size collection is conducted on a pipe through a laser diameter measuring sensor after spinning forming is conducted. And establishing a mapping relation model between the diameter Dvar of the reducer pipe and the radius R2 of the point on the top / bottom elliptical plane corresponding to the contact point of the two rollers, deducing and solving a relational expression between the radius R of the point on the ellipse and the rotation angle theta according to the mapping relation model in the above steps, and rapidly obtaining the rotation angle theta of the elliptical roller. And the rotating angle theta of the bending die is controlled, and online regulation and control of the aperture size of the bending die are achieved. By means of the variable-diameter pipe bending device, variable-diameter pipe bending forming within a certain pipe diameter range is achieved, and the die does not need to be replaced according to different pipe diameters.

Description

Technical Field

[0001] The invention relates to the field of rotary bending composite forming of variable diameter pipes for complex aerospace pipelines, in particular to a dynamic online adjustment method for a variable diameter pipe bending die hole based on a rotary bending composite process. Background Art

[0002] Pipeline system components are important components of equipment such as aerospace, shipbuilding, nuclear energy engineering, and automobiles, and they play key roles in load, transmission, and heat exchange. At present, high-end advanced manufacturing equipment often has more stringent requirements on the shape and size of pipes, and lightweight and forming quality levels have an important impact on the service performance and life of equipment. However, the reasonable design of the diameter and bend distribution of complex variable diameter bending pipe fittings has significantly improved the lightweight level of the structure, and the pipe fittings are not only typical lightweight and high-efficiency components, but also key components urgently needed for the development of high-end equipment. Spin bending is carried out by combining necking spinning with flexible bending forming of pipes. It has both the process advantages of spinning and the technical advantages of flexible bending forming of pipes, and has high overall forming efficiency at one time. However, when the necking spinning wheel stops early and the propulsion mechanism and the bending mechanism cooperate to complete the subsequent bending forming process, this forming method has high requirements on the accuracy of the aperture size of the bending die, and there are few existing domestic and foreign research and equipment for this process. In addition, there is a coupling effect between spinning and bending deformation, which makes its forming law and regulation difficult, limiting the application of the progressive forming process of spin bending;

[0003] The purpose of the present invention is to provide a method for dynamically adjusting the diameter-reducing tube bending die hole on the basis of a rotary bending composite process, which solves the problem of inconvenient dynamic control of the bending die hole diameter in the current technology. Summary of the invention

[0004] The purpose of the present invention is to provide a method for dynamically adjusting the diameter-reducing tube bending die hole online based on a rotary bending composite process, which solves the problem of inconvenient dynamic control of the bending die hole diameter in the prior art;

[0005] To achieve the above purpose, the present invention provides the following technical solutions

[0006] A dynamic online adjustment method for a diameter-reducing tube bending die hole based on a rotary bending composite process comprises the following steps:

[0007] Step 1: Before the reducer is bent, the initial outer diameter D0 of the tube is measured to obtain its size information parameters.

[0008] Step 2: The variable diameter tube spinning and bending composite process consists of a "tube spinning-tube bending" composite process. During the tube spinning process, the spinning roller performs multiple movements in the form of an Archimedean spiral trajectory to achieve tube spinning variable diameter.

[0009] Step 3: After spinning, use a laser diameter measurement sensor to collect the dimensions of the tube.

[0010] Step 4: According to the collected reducer diameter D var (i.e. the actual aperture size R1), establish the reducer diameter D var A mapping relationship model of the radius R2 of the point on the top / bottom elliptical plane corresponding to the contact point of the two rollers is further used to adjust the aperture size of the bending die based on the mapping relationship model.

[0011] Step 5: Control the rotation of the elliptical bending die through the private service motor. According to the mapping relationship model in the above steps, control the rotation angle θ of the bending die to achieve online regulation of the aperture size of the bending die. That is, the elliptical bending die has a major semi-axis a and a minor semi-axis b. a is the initial position, achieving the minimum bending radius D of the pipe min ; With two initial minor axis radii R b is the initial position, achieving the maximum bending radius of the pipe D max .

[0012] On the basis of the above technical solution, the present invention also provides the following optional technical solution:

[0013] In a preferred embodiment, step one is as follows: determining the area of ​​the tube to be formed; firstly fixing the metal tube to the pushing mechanism, the area between the pushing mechanism and the bending die is the area to be formed; according to the length of the area to be formed, setting the feed amount and feed speed of the pushing mechanism.

[0014] In a preferred embodiment, step 2 is specifically as follows: in the tube bending process, the tube is first necked and reduced in diameter, and then subjected to bending; during the diameter reduction process, the roller is fed by spinning, and the roller motion trajectory is defined by the Archimedean spiral equation:

[0015] r=d*(1+t)

[0016] x=r*cos(t*360)

[0017] y=r*sin(t*360)

[0018] z=0

[0019] Where t is time and r is the spiral radius.

[0020] In a preferred solution: Step three is specifically as follows: after the pipe is spun and reduced in diameter, a laser diameter measuring sensor is used between the spinning mechanism and the bending mechanism to perform online detection of the diameter Dvar of the reduced diameter pipe, for example: Blue Ocean Precision-MILS150, online projection image measuring instrument TM-X5000.

[0021] In a preferred solution, step 4 is specifically as follows: according to the collected reducer diameter Dvar (ie, the actual aperture size R1), relevant training is performed through quadratic fitting or machine learning:

[0022] B=(X T X) -1 X T Y

[0023] In the formula, B: n*1 matrix X: m*n matrix, input variable / feature Y: m*1 matrix, output variable / target variable m: number of samples n: number of features.

[0024] Establish the reducer diameter R var The mapping relationship model of the radius R2 of the point on the top / bottom elliptical plane corresponding to the contact point of the two rollers provides data support for the subsequent rapid acquisition of the rotation angle θ of the rotary wheel.

[0025] In a preferred embodiment, step 4 is as follows: according to the diameter D of the reducer var The mapping relationship model of the radius R2 of the point on the top / bottom elliptical plane corresponding to the contact point of the two rollers is then substituted into the ellipse parameter equation by the major semi-axis a, the minor semi-axis b and the radius R2 of the point on the top / bottom elliptical plane corresponding to the contact point of the two rollers:

[0026]

[0027] The deformation solution can obtain the relationship between the radius R2 (i.e., distance) from a point on the elliptical trajectory to the center O (i.e., the axis):

[0028]

[0029] Where a is the major semi-axis, b is the minor semi-axis, and R2 is the radius of the point on the corresponding top / bottom elliptical plane.

[0030] According to the above formula, the size of the rotation angle θ of the elliptical roller can be quickly obtained, and then the rotation of the elliptical bending die is controlled by the private service motor to control the rotation angle θ of the bending die to achieve online regulation of the aperture size of the bending die.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention relates to a method for dynamically adjusting a bending die hole of a reducer tube based on a rotary bending composite process.

[0033] The invention realizes the spinning and bending of the reducer tube by the composite process of tube spinning and tube bending. After spinning, the laser diameter measurement sensor is used to collect the size of the tube. The diameter D of the reducer tube is established. varThe mapping relationship model of the radius R2 of the point on the top / bottom elliptical plane corresponding to the contact point of the two rollers is used to control the rotation angle θ of the bending die according to the mapping relationship model of the above steps to realize the online regulation of the aperture size of the bending die. The advantage of the present invention is that the aperture size of the bending die can be regulated online without stopping the forming process, and the variable diameter tube within a certain tube diameter range can be bent and formed without changing the mold according to different tube diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0035] Figure 1 It is a flow chart of the processing of the present invention;

[0036] Figure 2a It is a structural diagram of one side of the reducer tube rotation and bending forming mechanism of the present invention;

[0037] Figure 2b The other side structure of the reducer tube bending forming mechanism of the present invention

[0038] Figure 3 It is the Archimedean spiral trajectory of the necking and spinning forming roller of the bending mechanism of the present invention;

[0039] Figure 4 It is a schematic diagram of the geometric rapid solution of the rotation angle of the elliptical roller of the bending mechanism of the present invention;

[0040] Notes on the reference numerals: 1 - metal tube 2 - rotating wheel mechanism 3 - roller I 4 - roller II 5 - roller III 6 - bent elliptical roller I 7 - bent elliptical roller II 8 - main rotating shaft of bending mechanism 9 - base 10 - laser diameter measuring sensor 11 - rectangular frame. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0042] It is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0043] The embodiments of the present invention and all other

[0044] The embodiments all belong to the protection scope of the present invention.

[0045] Example 1

[0046] like Figure 1-4As shown, an embodiment of the present invention provides a method for dynamically adjusting a bending die hole of a reducer tube based on a rotation-bending composite process, which is specifically as follows:

[0047] (1) Assemble the pipe fittings and forming mechanism, such as Figure 1 As shown, before the reducer is bent, the initial outer diameter D0 of the pipe is measured, and the initial outer diameter of the pipe is measured to be D0 = 70 mm.

[0048] (2) During the spinning process of the pipe, the spinning roller performs multiple movements in the form of an Archimedean spiral trajectory to achieve pipe spinning diameter change. According to the specific implementation scheme in Example 1 (1), the initial outer diameter of the pipe measured is D0=70 mm, the initial spiral radius r of the Archimedean spiral is set, and the specific equation of the Archimedean spiral is determined:

[0049] x=(35-0.03t)*cos(t)

[0050] y=(35-0.03t)*sin(t)

[0051] z=0

[0052] The roller motion trajectory is set according to the Archimedean spiral equation.

[0053] (3) After spinning, a laser diameter measuring sensor 10 is used to collect the dimensions of the tube. A laser diameter measuring sensor is used between the spinning mechanism and the bending mechanism to measure the diameter D of the variable diameter tube. var Carry out online testing, for example: Blue Ocean Precision-MILS150, online projection image measuring instrument TM-X5000.

[0054] The spinning mechanism here includes a rotating wheel mechanism 2 for facilitating the metal tube 1 to pass through. The rotating wheel mechanism 2 is provided with rollers I3, II4 and III5 for spinning the outer side of the metal tube 1. The rotating wheel mechanism 2 drives the multiple rollers to rotate to adjust the diameter of the metal tube 1.

[0055] The bending mechanism here includes a bending elliptical roller I6 and a bending elliptical roller II7 for bending the metal tube 1. The shaft ends of the bending elliptical roller I6 and the bending elliptical roller II7 are connected to a rectangular frame 11. The rectangular frame 11 is connected to a main rotating shaft 8 of the bending mechanism for driving the bending mechanism to rotate. The main rotating shaft 8 of the bending mechanism is arranged on a base 9.

[0056] (4) According to the diameter of the reducer after collection D var (i.e. the actual aperture size R1), and related training is performed through quadratic fitting or machine learning:

[0057] B=(X T X) -1 X T Y

[0058] In the formula, B: n*1 matrix X: m*n matrix, input variable / feature Y: m*1 matrix, output variable / target variable m: number of samples n: number of features.

[0059] A mapping relationship model between the reducer diameter Rvar and the radius R2 of the point on the top / bottom elliptical plane corresponding to the contact point of the two rollers is established to provide data support for the subsequent rapid acquisition of the rotation angle θ of the rotary wheel.

[0060]

[0061] According to the reducer diameter D var The mapping relationship model of the radius R2 of the point on the top / bottom elliptical plane corresponding to the contact point of the two rollers is then substituted into the ellipse parameter equation by the major semi-axis a, the minor semi-axis b and the radius R2 of the point on the top / bottom elliptical plane corresponding to the contact point of the two rollers:

[0062]

[0063] The deformation solution can obtain the relationship between the radius R2 (i.e., distance) from a point on the elliptical trajectory to the center O (i.e., the axis):

[0064]

[0065] Where a is the major semi-axis, b is the minor semi-axis, and R2 is the radius of the point on the corresponding top / bottom elliptical plane.

[0066] According to the above formula, the size of the elliptical roller rotation angle θ can be quickly obtained. The size of the elliptical roller rotation angle θ is measured to be θ=37.28°. Then, the rotation of the elliptical bending die is controlled by the private service motor to control the rotation angle θ of the bending die to realize online regulation of the bending die aperture size.

Claims

1. A dynamic online adjustment method for a reducer tube bending die hole based on a rotary bending composite process, characterized in that: The following steps are involved: Step 1: Before the reducer is bent, the initial outer diameter D0 of the tube is measured to obtain its size information parameters; Step 2: The variable diameter pipe spinning and bending composite process consists of the "pipe spinning-pipe bending forming" composite process. During the pipe spinning process, the spinning roller performs multiple movements in the form of an Archimedean spiral trajectory to achieve pipe spinning and variable diameter; Step 3: After spinning, use a laser diameter measurement sensor to collect the dimensions of the tube; Step 4: According to the collected reducer diameter D var , that is, the actual aperture size R1, to establish the reducer diameter D var A mapping relationship model of the radius R2 of the point on the top / bottom elliptical plane corresponding to the contact point of the two rollers, and further adjusting the aperture size of the bending die based on the mapping relationship model; Step 5: The elliptical bending die is controlled to rotate by the private service motor, and the rotation angle θ of the bending die is controlled according to the mapping relationship model of the above steps to realize the online regulation of the aperture size of the bending die; The specific control is: the elliptical bending die has a long semi-axis a and a short semi-axis b, and the two initial long axis radii Ra are used as the initial position to achieve the minimum radius bending D of the tube min ; With two initial minor axis radii R b is the initial position, achieving the maximum bending radius of the pipe D max .

2. The method for dynamically adjusting the bending die hole of a reducer tube based on a rotary bending composite process according to claim 1 is characterized in that: Step one is as follows: determine the area of ​​the pipe to be formed; first fix the metal pipe to the pushing mechanism, and the area between the pushing mechanism and the bending die is the area to be formed; according to the length of the area to be formed, set the feed amount and feed speed of the pushing mechanism.

3. The method for dynamically adjusting the bending die hole of a reducer tube based on a rotary bending composite process according to claim 1 is characterized in that: Step 2 is as follows: the tube is firstly subjected to necking and diameter reduction, and then subjected to spinning and forming; during the diameter reduction process, the roller is fed by spinning, and the roller motion trajectory is defined by the Archimedean spiral equation: r＝10*(1+t) x=r*cos(t*360) y=r*sin(t*360) z＝0 Where t is time and r is the spiral radius.

4. The method for dynamically adjusting the bending die hole of a reducer tube based on a rotary bending composite process according to claim 1 is characterized in that: Step 3 is as follows: After the pipe is spun and reduced in diameter, a laser diameter measuring sensor is used between the spinning mechanism and the bending mechanism to measure the diameter D of the reduced-diameter pipe. var Perform online testing.

5. The method for dynamically adjusting the bending die hole of a reducer tube based on a rotary bending composite process according to claim 1 is characterized in that: Step 4 is as follows: according to the diameter D of the reducer after collection var , that is, the actual aperture size R1, is trained by quadratic fitting or machine learning: B=(X T X) -1 X T Y In the formula, B: n*1 matrix X: m*n matrix, input variable / feature Y: m*1 matrix, output variable / target variable m: number of samples n: number of features; Establish the reducer diameter R var The mapping relationship model of the radius R2 of the point on the top / bottom elliptical plane corresponding to the contact point of the two rollers provides data support for the subsequent rapid acquisition of the rotation angle θ of the rotary wheel.

6. The method for dynamically adjusting the bending die hole of a reducer tube based on a rotary bending composite process according to claim 1 is characterized in that: Step 5 is as follows: according to the diameter D of the reducer var The mapping relationship model of the radius R2 of the point on the top / bottom elliptical plane corresponding to the contact point of the two rollers is then substituted into the ellipse parameter equation by the major semi-axis a, the minor semi-axis b and the radius R2 of the point on the top / bottom elliptical plane corresponding to the contact point of the two rollers: The deformation solution can obtain the relationship between the radius R2 (i.e., distance) from a point on the elliptical trajectory to the center O (i.e., the axis): Where a is the major semi-axis, b is the minor semi-axis, and R2 is the radius of the point on the corresponding top / bottom elliptical plane; According to the above formula, the size of the rotation angle θ of the elliptical roller can be quickly obtained, and then the rotation of the elliptical bending die is controlled by the private service motor to control the rotation angle θ of the bending die to achieve online regulation of the aperture size of the bending die.

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