Turn-down collar former and integral forming process thereof

Abstract

The invention discloses a lapel former and an integral forming process thereof, and relates to the technical field of lapel formers. According to the turn-down collar former, the non-rectangular plate is used as the raw material, so that a large number of complex mathematical models are prevented from being established and solved, the production operation is simplified, the working efficiency is improved, the parabola focal parameters and the cone spread surface size can be changed according to the actual production line requirement, and rapid design modeling of the turn-down collar former is realized; according to the cylindrical charging barrel lapel forming device, the integral forming of the lapel forming device is realized, the forming efficiency is high, the quality is good, the cost is low, the connecting curve is easily modified according to the unfolded surface of the cylindrical charging barrel lapel forming device, and the lapel forming device can be used for forming the lapel by virtue of a similar edge rolling integral forming process. And different columnar lapel forming devices are obtained, and the universality is high.

Description

Technical Field

[0001] The invention relates to the technical field of lapel formers, in particular to a lapel former and an integral forming process thereof. Background Art

[0002] The lapel former is a key component of the forming, filling, sealing and packaging machine. It is used to fold the flat roll packaging material through the lapel former to form a cylindrical packaging bag, and then fill the material. It has a direct impact on the packaging style, speed and product quality. The lapel former generally includes a shoulder curved surface, a back plane and a cylindrical (cylindrical, elliptical, prism, etc.) barrel. In order to ensure that the packaging material is evenly stressed during the folding process, without compression wrinkles and extension damage, the packaging material should try to fit the back plane and shoulder curved surface through the lapel former. Therefore, the shoulder curved surface of the lapel former must be a developable surface.

[0003] Invention disclosure CN112026261A discloses a series of lapel formers without back planes, whose shoulder curved surface is a cylinder, and does not involve the forming process of the lapel former. Most of the conventional processing and manufacturing methods of lapel formers are mainly to use sheet metal for welding, multi-axis milling machining center for machining, and precision casting. Sheet metal welding is currently the most commonly used processing method, but the former produced by this process is difficult to succeed in one go, and needs to go through sheet metal cutting, bending, welding, grinding, and correction. Bending and welding require high requirements for tooling and worker experience. In order to improve the efficiency and consistency of forming, some special devices are often required. For example, invention disclosure CN111889548A discloses a lapel former curved surface automatic bending machine, invention patent CN113770579B invents an automatic welding forming method for a lapel former, and invention patent CN113770580B invents a lapel former welding positioning tooling and positioning method. However, in order to ensure the smooth transition of the sheet metal joints, it needs to be trimmed several times before it can be used, which has a very low production efficiency and is not suitable for mass production. Multi-axis machining centers have advantages in machining high-precision parts with complex curved shapes. Although they can ensure the machining accuracy of the lapel former, they first need to accurately model the various parts of the lapel former, and the clamping process when machining the curved surface is relatively cumbersome, which requires high professional skills of the workers and will also increase the production cost. The precision casting method is more complicated and in order to meet the requirements of the shape and position tolerances such as the surface roughness of the lapel former, this method also requires a high cost.

[0004] In order to ensure the accuracy and quality of the lapel former during forming and manufacturing, it is necessary to establish a mathematical model for the shoulder surface of the lapel former obtained by folding a rectangular plane and the boundary curve between the shoulder surface and the back plane from the perspectives of spatial analytic geometry and differential geometry. The derivation process is complicated and the solution is difficult, which leads to the need to simplify it in practical applications. The forming effect has a large error and requires repeated trimming to meet production requirements. In addition, the lapel former is formed by a rectangular plane, and the characteristic dimensions of each shape influence and constrain each other. The design method of lapel formers with different barrel shapes is not universal. Therefore, we propose a lapel former and its overall forming process to solve the above problems. Summary of the invention

[0005] Technical issues solved

[0006] In view of the shortcomings of the prior art, the present invention provides a lapel former and its overall forming process, which solves the problems of needing to establish a large number of mathematical models, complex derivation process, and great difficulty in solving, resulting in large errors in the forming effect in actual applications, repeated trimming is required to meet production requirements, and the lack of universality.

[0007] Technical Solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a lapel former, including a curved surface as a whole, the curved surface as a whole includes a first curved surface and a second curved surface, the intersection of the first curved surface and the second curved surface is a parabola, the focus of the parabola is located in the first curved surface, the focus of the parabola coincides with the vertex of the second curved surface, and the angle between the generatrix of the first curved surface and the tangent at a point on the parabola is equal to the angle between the generatrix of the second curved surface and the tangent at the same point on the parabola.

[0009] Furthermore, the curved surface as a whole is a plate having a non-rectangular plane, the thickness of the plate is 0.2-2 mm, and the plate is made of a low-strength metal material capable of elastic-plastic deformation.

[0010] Furthermore, the first curved surface is a cylindrical development surface, and the second curved surface is a first conical development surface.

[0011] Furthermore, the second curved surface includes a first conical development surface and a first back plane, and the first conical development surface is respectively arranged on both sides of the first back plane.

[0012] Furthermore, the first curved surface includes a side wall plane unfolded surface and a rounded cylindrical surface unfolded surface, and the side wall plane unfolded surface and the rounded cylindrical surface unfolded surface are arranged at intervals; the second curved surface includes a second conical unfolded surface and a second back plane unfolded surface, and the second conical unfolded surface and the second back plane unfolded surface are arranged at intervals; a rolling mold is movably arranged outside the first curved surface.

[0013] Furthermore, a connecting line between the unfolded surface of the side wall plane and the unfolded surface of the second back plane is a straight line, and a connecting line between the unfolded surface of the rounded cylindrical surface and the unfolded surface of the second cone is a parabola.

[0014] Furthermore, the rolling mold includes an upper mold and a lower mold, and the upper mold and the lower mold are both semi-rectangular.

[0015] The present invention also provides a lapel former integral forming process, comprising the following steps:

[0016] S1. Select a plate of low-strength metal material with a thickness of 0.2-2 mm that can undergo elastic-plastic deformation, and cut it to form a non-rectangular plane shape;

[0017] S2, pre-bending the plate through a bending device and a bending knife, and then performing a rounding operation to control the barrel forming, thereby forming a lapel former.

[0018] Further, the barrel is cylindrical, and S2 specifically includes the following steps:

[0019] S211, bending along the connecting line between the cylindrical development surface and the first conical development surface, that is, bending along a parabola, bending the plane sheet material to form a bending line, separating the cylindrical development surface and the first conical development surface in the plane sheet material;

[0020] S212, then only the cylindrical unfolded surface is rolled, and a multi-step segmented arc bending is performed to achieve the rolling effect, or the upper and lower molds with semi-cylindrical surface characteristics are used to make the cylindrical unfolded surface unstable under pressure and pre-formed into a U-shaped bend, and then the U-shaped bend is further rolled into a cylinder by air pressure. While the cylindrical unfolded surface is rolled, the first conical unfolded surface is bent into a conical surface, so that a lapel former of a cylindrical barrel can be formed;

[0021] S213. According to the requirements, the cylindrical barrel lapel former without a back plane can be further flattened to obtain a cylindrical barrel lapel former with a first back plane.

[0022] Furthermore, the barrel is non-cylindrical, and S2 further comprises the following steps:

[0023] S221, bend the plane sheet along the intersection lines of the left and right sides of the plane sheet to form a bending line, pre-bend the intersection line of the rounded cylindrical surface and the side wall plane on the same side, and then pre-bend the intersection line of the second cone surface and the second back plane surface on the other side of the plane sheet;

[0024] S222, performing arc bending on the unfolded surface of each rounded cylindrical surface, and then further air-compressing and rolling the pre-bent first curved surface into a cylindrical shape in the upper mold and the lower mold having a semi-rectangular feature, thereby forming a lapel former for a rectangular barrel.

[0025] Beneficial Effects

[0026] The present invention has the following beneficial effects:

[0027] (1) The lapel former uses non-rectangular sheet materials as raw materials, thereby avoiding the need to establish and solve a large number of complex mathematical models for the lapel former, especially for the shoulder curved surface and the intersection curve between the shoulder curved surface and the back plane, thereby simplifying the production operation, avoiding large errors in the forming effect and the need for repeated trimming, and improving work efficiency.

[0028] (2) The overall forming process of the lapel former uses a developable curved surface formed by a combination of a cylindrical development surface and a conical development surface to form a sheet material with a parabolic intersection line. The parabolic focal parameters and the conical development surface size can be changed according to the actual production line requirements, such as the angle between the back and the vertical direction, the back length, etc., to achieve rapid design and modeling of the lapel former.

[0029] (3) Due to the dynamic constraint relationship of the developable surfaces on both sides of the bending line, the lapel former integral forming process can realize the natural bending of the unconstrained shoulder surface along the parabolic intersection curve by rolling the cylindrical barrel portion, thereby realizing the integral forming of the lapel former. The forming efficiency is high, the quality is good, and the cost is low. It is also easy to modify the intersection curve according to the unfolding surface of the cylindrical barrel lapel former. With the help of a similar rolling integral forming process, different columnar lapel formers can be obtained, which has high versatility.

[0030] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the unfolded cylindrical barrel lapel former in Example 1 of the present invention.

[0032] Figure 2 Schematic diagram of the front view of the cylindrical barrel lapel former in Example 1 of the present invention.

[0033] Figure 3 It is a schematic structural diagram of the left view of the cylindrical barrel lapel former in Example 1 of the present invention.

[0034] Figure 4 This is a schematic diagram of the structure of the first back plane in Example 1 of the present invention.

[0035] Figure 5This is a schematic diagram of the unfolded rectangular barrel lapel former in Example 2 of the present invention.

[0036] Figure 6 It is a schematic diagram of the structure of the rolling mold in Example 2 of the present invention.

[0037] Figure 7 Schematic diagram of the front view of the rectangular barrel lapel former in Example 2 of the present invention.

[0038] Figure 8 It is a schematic diagram of the unbent rectangular plane of the present invention.

[0039] Fig. 9 It is a schematic diagram of the concave and convex surface features formed by bending a rectangular plane along a curve according to the present invention.

[0040] In the figure, 1, the entire curved surface; 101, the first curved surface; 102, the second curved surface; 2, the cylindrical unfolded surface; 3, the first conical unfolded surface; 4, the first back plane; 5, the side wall plane unfolded surface; 6, the rounded cylindrical unfolded surface; 7, the second back plane unfolded surface; 8, the second conical unfolded surface; 9, the rolling mold; 901, the upper mold; 902, the lower mold. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0043] Example 1

[0044] See also Figure 1-Figure 4 , Figure 8 as well as Fig. 9The embodiment of the present invention provides a technical solution: a lapel former, comprising a curved surface as a whole 1, the curved surface as a whole 1 comprising a first curved surface 101 and a second curved surface 102, the intersection of the first curved surface 101 and the second curved surface 102 is a parabola, the focus of the parabola is located in the first curved surface 101, the focus of the parabola coincides with the vertex of the second curved surface 102, and the angle between the generatrix of the first curved surface 101 and the tangent at a point on the parabola is equal to the angle between the generatrix of the second curved surface 102 and the tangent at the same point on the parabola.

[0045] Specifically, the curved surface 1 is a plate of a non-rectangular plane, the thickness of the plate is 0.2-2 mm, and the plate is made of a low-strength metal material capable of elastic-plastic deformation.

[0046] In this embodiment, the developable surface theory shows that after an ideal plane without thickness and not stretchable is bent along a curve, two developable surfaces with the same average curvature and opposite signs will be formed on both sides of the bending line, namely, a concave surface and a convex surface, and during the bending process, the curvature size corresponds to the bending angle one by one. In addition, when the generatrixes of the two developable surfaces are collinear before bending, during the entire bending process, the bending line is located in a spatial plane, namely, the intersection line of the two developable surfaces and the bending line are spatial plane curves, an inextensible rectangle without thickness. After plane 1 is bent along curve s, two developable surfaces S1 and S2 with average curvatures k1 and k2 are formed, where k1 = -k2. Surfaces S1 and S2 are connected by a spatial plane curve s', and the angle between their generatrixes is γ. Before bending, the generatrixes of the two are located on the same straight line BB'. Since the surface is not stretchable, the surface curvature and bending angle are dynamically constrained during the bending process. When the generatrixes of the two developable surfaces have the same angle with the bending line of the curve during the bending process, the two developable surfaces have the same dihedral angle along the bending line of the curve at any time.

[0047] According to the properties of the parabola: the tangent and the directrix of a point on the parabola intersect at one point, and a perpendicular to the directrix is ​​drawn through the tangent point. Then the tangent bisects the angle formed by the focus, the foot of the perpendicular and the tangent point. Because the cylindrical generatrix is ​​perpendicular to the parabola directrix, and the focus of the parabola coincides with the vertex of the cone, it can be seen that the angle formed by the cylindrical generatrix and the cone generatrix at any point on the intersection of their parabolas is bisected by the tangent at that point, and α=β.

[0048] Low-strength metal materials that can undergo elastic-plastic deformation can be bent and rolled to avoid breakage. The parabola focus parameters and cone development surface size can be changed according to actual production line requirements, such as the angle between the back and the vertical direction, the back length, etc., to achieve rapid design and modeling of the lapel former.

[0049] Specifically, the first curved surface 101 is a cylindrical development surface 2 , and the second curved surface 102 is a first conical development surface 3 .

[0050] In this embodiment, the cylindrical unfolded surface 2 is cylindrical after the rolling operation, and the first conical unfolded surface 3 is used to form a conical surface.

[0051] Specifically, the second curved surface 102 includes a first conical development surface 3 and a first back plane 4 , and the first conical development surface 3 is disposed on both sides of the first back plane 4 .

[0052] In this embodiment, the first conical unfolded surface 3 can be flattened by a flattening operation to form a first back plane 4, which is suitable for different lapel requirements.

[0053] A lapel former integral forming process, such as Figure 1 As shown, the following steps are included:

[0054] S1. Select a plate of low-strength metal material with a thickness of 0.2-2 mm that can undergo elastic-plastic deformation, and cut it to form a non-rectangular plane shape;

[0055] S2, pre-bending the plate through a bending device and a bending knife, and then performing a rounding operation to control the barrel forming, thereby forming a lapel former.

[0056] In this embodiment, by using non-rectangular sheet materials as raw materials, the establishment and solution of a large number of complex mathematical models for the lapel former, especially for the shoulder surface and the intersection curve of the shoulder surface and the back plane, is avoided. Pre-bending is used to separate the components of the unfolded surface of the lapel former, so that the two developable surfaces are mutually constrained and formed at the same time in the next step, and it is convenient for the subsequent steps to perform forming operations on only a certain component of the unfolded surface. For a cylindrical barrel lapel former, pre-bending is performed at the intersection of the parabola. For a non-cylindrical barrel lapel former, pre-bending is required at the intersection of its two components and at the intersection of the curved planes in each part. In addition, the bent side of the part containing the conical surface is opposite to the bent side of the other part.

[0057] Rolling is used to form cylindrical barrels. Under geometric constraints, while the barrel is being formed, features such as the back plane and shoulder surface are naturally formed. For cylindrical barrels of different shapes, a one-step to multi-step rolling process can be used.

[0058] Specifically, the barrel is cylindrical, such as Figure 1-Figure 4 As shown, S2 specifically includes the following steps:

[0059] S211, bending along the connecting line between the cylindrical development surface 2 and the first conical development surface 3, that is, bending along a parabola, bending the plane sheet material to form a bending line, separating the cylindrical development surface 2 and the first conical development surface 3 in the plane sheet material;

[0060] S212, then only the cylindrical unfolded surface 2 is rolled, and a multi-step segmented arc bending is performed to achieve the rolling effect, or the upper and lower molds with semi-cylindrical surface characteristics are used to make the cylindrical unfolded surface 2 unstable under pressure and pre-formed into a U-shaped bend, and then the U-shaped bend is further rolled into a cylinder by air pressure. While the cylindrical unfolded surface 2 is rolled, the first conical unfolded surface 3 is bent into a conical surface, so that a lapel former of a cylindrical barrel can be formed;

[0061] S213, according to the requirements, the cylindrical barrel lapel former without a back plane can be further flattened to obtain a cylindrical barrel lapel former with a first back plane 4.

[0062] In this embodiment, according to the developable surface theory, when a flat plate is bent along a parabola, the cylindrical unfolded surface 2 and the first conical unfolded surface 3 have the same dihedral angle everywhere. During the bending process, the contour of the bending tool can be the same as the intersection line of the parabola on the flat plate, and the thickness of the bending tool head along the contour line is the same.

[0063] According to the developable surface theory, when the flat sheet is bent along a parabola, the average curvature of the cylindrical surface and the conical surface is dynamically constrained with the bending degree, and the average curvature of the cylindrical unfolded surface 2 is equal to the average curvature of the first conical unfolded surface 3, so a cylindrical barrel lapel former can be formed. By flattening the first conical unfolded surface 3, a cylindrical barrel lapel former containing a first back plane 4 can be obtained, which is suitable for products with different requirements.

[0064] Example 2

[0065] See also Figure 6-Figure 7 Specifically, the first curved surface 101 includes a side wall plane unfolded surface 5 and a rounded cylindrical surface unfolded surface 6, and the side wall plane unfolded surface 5 and the rounded cylindrical surface unfolded surface 6 are arranged at intervals. The second curved surface 102 includes a second conical unfolded surface 8 and a second back plane unfolded surface 7, and the second conical unfolded surface 8 and the second back plane unfolded surface 7 are arranged at intervals. A rolling mold 9 is movably arranged outside the first curved surface 101.

[0066] In the present embodiment, the side wall plane unfolded surface 5 and the rounded cylindrical surface unfolded surface 6 are rolled to form a rectangular barrel shape, and the side wall plane unfolded surface 5 and the rounded cylindrical surface unfolded surface 6 are spaced apart for bending at their intersection, and the second conical unfolded surface 8 and the second back plane unfolded surface 7 are rolled to form a cone shape, and the second conical unfolded surface 8 and the second back plane unfolded surface 7 are spaced apart for bending at their intersection, and the first curved surface 101 is rolled into shape by a rolling mold 9.

[0067] Specifically, the connecting line between the side wall plane development surface 5 and the second back plane development surface 7 is a straight line, and the connecting line between the rounded cylindrical surface development surface 6 and the second cone development surface 8 is a parabola.

[0068] In this embodiment, a straight line and a parabola are used to bend a flat sheet material to form a bending line to separate the first curved surface 101 and the second curved surface 102 .

[0069] Specifically, the rolling mold 9 includes an upper mold 901 and a lower mold 902 , and both the upper mold 901 and the lower mold 902 are semi-rectangular.

[0070] In this embodiment, the upper mold 901 and the lower mold 902 are respectively arranged outside the bent first curved surface 101, and squeezed to roll the first curved surface 101 into a cylindrical shape by air compression.

[0071] Specifically, the barrel is non-cylindrical, such as Fig. 9 As shown, S2 also includes the following steps:

[0072] S221, bend the plane sheet along the intersection lines of the left and right sides of the plane sheet to form a bending line, pre-bend the intersection line of the rounded cylindrical surface 6 and the side wall plane surface 5 on the same side, and then pre-bend the intersection line of the second cone surface 8 and the second back plane surface 7 on the other side of the plane sheet;

[0073] S222, the unfolded surface 6 of each rounded cylindrical surface is bent into an arc shape, and then the pre-bent first curved surface 101 is further compressed and rolled into a cylindrical shape in the upper mold 901 and the lower mold 902 with semi-rectangular characteristics, so as to form a lapel former of a rectangular barrel.

[0074] In this embodiment, the bending line is used to separate the developable surfaces on the left and right sides. Through the pre-bending of each part and the coordinated use of the upper mold 901 and the lower mold 902, the subsequent rolling forming operation is facilitated. Depending on the required barrel shape, the rolling mold 9 of different shapes is replaced.

[0075] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0076] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A lapel former, comprising a curved surface (1), characterized in that: The curved surface as a whole (1) comprises a first curved surface (101) and a second curved surface (102); the intersection of the first curved surface (101) and the second curved surface (102) is a parabola; the focus of the parabola is located inside the first curved surface (101); the focus of the parabola coincides with the vertex of the second curved surface (102); and the angle between the generatrix of the first curved surface (101) and the tangent at a point on the parabola is equal to the angle between the generatrix of the second curved surface (102) and the tangent at the same point on the parabola.

2. A lapel former according to claim 1, characterized in that: The curved surface as a whole (1) is a plate material that is not a rectangular plane, the thickness of the plate material is 0.2-2 mm, and the plate material is a low-strength metal material that can undergo elastic-plastic deformation.

3. A lapel former according to claim 1, characterized in that: The first curved surface (101) is a cylindrical development surface (2), and the second curved surface (102) is a first conical development surface (3).

4. A lapel former according to claim 3, characterized in that: The second curved surface (102) comprises a first conical development surface (3) and a first back plane (4), and the first conical development surface (3) is respectively arranged on both sides of the first back plane (4).

5. A lapel former according to claim 1, characterized in that: The first curved surface (101) includes a side wall plane unfolded surface (5) and a rounded cylindrical surface unfolded surface (6), and the side wall plane unfolded surface (5) and the rounded cylindrical surface unfolded surface (6) are arranged at intervals. The second curved surface (102) includes a second conical unfolded surface (8) and a second back plane unfolded surface (7), and the second conical unfolded surface (8) and the second back plane unfolded surface (7) are arranged at intervals. A rolling mold (9) is movably arranged outside the first curved surface (101).

6. A lapel former according to claim 5, characterized in that: The connecting line between the side wall plane unfolded surface (5) and the second back plane unfolded surface (7) is a straight line, and the connecting line between the rounded cylindrical surface unfolded surface (6) and the second conical surface unfolded surface (8) is a parabola.

7. A lapel former according to claim 5, characterized in that: The rolling mold (9) comprises an upper mold (901) and a lower mold (902), and the upper mold (901) and the lower mold (902) are both semi-rectangular.

8. A lapel former integral forming process, characterized in that: The following steps are involved: S1. Select a plate of low-strength metal material with a thickness of 0.2-2 mm that can undergo elastic-plastic deformation, and cut it to form a non-rectangular plane shape; S2, pre-bending the plate through a bending device and a bending knife, and then performing a rounding operation to control the barrel forming, thereby forming a lapel former.

9. The lapel former integral forming process according to claim 8, characterized in that: The barrel is cylindrical, and S2 specifically includes the following steps: S211, bending along the connecting line between the cylindrical development surface (2) and the first conical development surface (3), that is, bending along a parabola, bending the plane sheet material to form a bending line, and separating the cylindrical development surface (2) and the first conical development surface (3) in the plane sheet material; S212, then only the cylindrical unfolded surface (2) is subjected to a rolling process, and a rolling effect is achieved by performing multi-step segmented arc bending, or using upper and lower molds with semi-cylindrical surface features to cause the cylindrical unfolded surface (2) to be preformed into a U-shaped bend by pressure instability, and then the U-shaped bend is further rolled into a cylinder by air pressure, and while the cylindrical unfolded surface (2) is rolled, the first conical unfolded surface (3) is bent into a conical surface, thereby forming a lapel former for a cylindrical barrel; S213. According to the requirements, the cylindrical barrel lapel former without a back plane can be further flattened to obtain a cylindrical barrel lapel former with a first back plane (4).

10. The lapel former integral forming process according to claim 8, characterized in that: The barrel is non-cylindrical, and S2 further comprises the following steps: S221, bend the plane sheet along the intersection lines of the left and right sides of the plane sheet to form a bending line, and pre-bend the intersection line of the rounded cylindrical surface (6) and the side wall plane surface (5) on the same side, and then pre-bend the intersection line of the second cone surface (8) and the second back plane surface (7) on the other side of the plane sheet; S222, the unfolded surface (6) of each rounded cylindrical surface is bent into an arc shape, and then the pre-bent first curved surface (101) is further compressed and rolled into a cylindrical shape in an upper mold (901) and a lower mold (902) having a semi-rectangular feature, thereby forming a lapel former for a rectangular barrel.

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