Narrow-surface section bar

Abstract

The invention relates to a steel profile. The invention is characterized in that a small convex narrow surface is arranged on the base body or the boss. Contact area can be reduced, friction force is reduced, and mechanical efficiency is improved.

Description

Technical Field

[0001] The present invention relates to steel profiles, including 6-chromium-13-molybdenum steel profiles. Background Art

[0002] Today's steel profiles have a wider plane. Summary of the Invention

[0003] The object of the present invention is to provide a narrow surface profile, wherein a protrusion is provided on a base body, so that a small narrow surface is formed on the upper surface of the base body while ensuring sufficient strength.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A narrow profile is in the shape of a long strip and has a base with protrusions arranged on the top of the base.

[0006] A narrow profile is in the shape of a long strip and comprises a base, a boss is arranged on the base and a protrusion is arranged on the boss.

[0007] A narrow profile is long and has a base. A left boss is provided on the upper left side of the base and a protrusion is provided on the left boss; a right boss is provided on the upper right side of the base and a protrusion is provided on the right boss.

[0008] According to a preferred embodiment, the height of the protrusion is ≤0.11 mm to 0.02 mm.

[0009] According to a preferred embodiment, the protrusion height may be <0.15mm to 0.02mm, or ≤0.14mm to 0.02mm, or ≤0.13mm to 0.02mm, or ≤0.12mm to 0.02mm, or ≤0.11mm to 0.02mm, or ≤0.1mm to 0.02mm, or ≤0.09mm to 0.02mm, or ≤0.08mm to 0.02mm.

[0010] According to a preferred embodiment, the protrusion is an arc-shaped surface or a circular arc surface.

[0011] Preferably, the protrusion is partially elliptical.

[0012] According to a preferred embodiment, the protrusion is formed by providing a downward step.

[0013] According to a preferred embodiment, the protrusion is a small trapezoid.

[0014] According to a preferred embodiment, the protrusion is a small boss.

[0015] According to a preferred embodiment, the protrusion has a small boss at its lower portion and an arc-shaped surface or a circular arc surface at its upper portion.

[0016] In a preferred embodiment, a step is provided beside the lower part of the protrusion.

[0017] In a preferred embodiment, a left step is provided on the left side below the protrusion; a right step is provided on the right side below the protrusion.

[0018] In a preferred embodiment, a left step is provided on the left side below the protrusion and a right step is provided on the right side below the protrusion; the width of the left step is preferably equal to the width of the right step, and the protrusion is preferably located at the middle position between the left step and the right step.

[0019] In a preferred embodiment, the height of the protrusion is preferably 0.02 mm to 0.09 mm. Preferably 0.02 mm to 0.08 mm. Preferably 0.02 mm to 0.07 mm. Preferably 0.02 mm to 0.06 mm. Preferably 0.02 mm to 0.05 mm. Preferably 0.02 mm to 0.04 mm. Preferably 0.02 mm to 0.03 mm. Preferably 0.03 mm to 0.05 mm. Preferably 0.03 mm to 0.06 mm. Preferably 0.03 mm to 0.07 mm. Preferably 0.03 mm to 0.08 mm.

[0020] In a preferred embodiment, a step is provided beside the lower part of the protrusion, and the upper surface of the step is preferably flat.

[0021] In a preferred embodiment, the upper surface of the step provided beside the lower part of the protrusion is a conical surface, and the angle between the conical surface and the horizontal plane is preferably ≤ 10 degrees.

[0022] In a preferred embodiment, the upper surfaces of the left step and the right step are preferably flat.

[0023] In a preferred embodiment, the width of the protrusion < 0.06 mm, preferably ≤ 0.05 to 0.03 mm. Preferably ≤ 0.04 to 0.02 mm. Preferably ≤ 0.03 mm.

[0024] In a preferred embodiment, the upper surface of the left step provided on the left side below the protrusion is a conical surface, and the angle between the conical surface and the horizontal plane is preferably ≤ 11 degrees.

[0025] In a preferred embodiment, the upper surface of the right step provided on the right side below the protrusion is a conical surface, and the angle between the conical surface and the horizontal plane is preferably ≤ 11 degrees.

[0026] In a preferred embodiment, the protrusion is formed by providing a conical surface on the upper plane of the boss.

[0027] In a preferred embodiment, the protrusion on the left boss is formed by providing a conical surface on the left side of the upper plane of the left boss; the protrusion on the right boss is formed by providing a conical surface on the left side of the upper plane of the right boss.

[0028] In a preferred embodiment, conical surfaces or protrusions formed by multiple conical surfaces can be provided on both sides of the protrusion.

[0029] According to a preferred embodiment, the base body is made into a thin (height made thin) base body to form a flexible profile.

[0030] According to a preferred embodiment, shallow spring grooves are provided below the base body.

[0031] According to a preferred embodiment, a conical surface is added to the left side of the left boss to make it a strong protrusion; a conical surface is added to the left side of the right boss to make it a strong protrusion.

[0032] According to a preferred embodiment, the boss is a trapezoidal or asymmetric trapezoidal boss.

[0033] According to a preferred embodiment, a lower conical surface is provided on the downward step surface.

[0034] According to a preferred embodiment, spring grooves may be provided below the base body.

[0035] According to a preferred embodiment, the vertical line downward at the middle position of its small narrow surface is collinear with the symmetry line of the spring groove provided below the base body.

[0036] According to a preferred embodiment, the symmetry line of the spring groove provided below the base body is located at the middle position between the middle vertical lines of the protrusions on the left boss and the right boss.

[0037] According to a preferred embodiment, the boss is composed of ≥2 trapezoidal or asymmetric trapezoidal surfaces connected together.

[0038] The present invention is a steel profile with extremely high manufacturing precision. Especially for the small narrow surface of the protrusion at the key part, the manufacturing tolerance can achieve <0.005 mm, and the precision consistency is good in mass production, the production efficiency is high, and the energy consumption is low. This profile has high strength and toughness. A more prominent advantage is that this profile can be nitrided on its surface (such as materials like 6Cr13MO), and a DLC coating with a low friction coefficient and good wear resistance is coated. Especially on the steel profile, a small narrow surface with a convex arc surface is manufactured, which can reduce the width of the base body and the boss of the steel profile, and the service performance is particularly good. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present invention will be described in detail below with reference to the embodiments shown in the drawings. In the drawings:

[0040] Figure 1 is a cross-sectional view of the narrow surface profile of the present invention;

[0041] Figure 2 is Figure 1 a partial view of the left view;

[0042] Figure 3 is a cross-sectional view of the narrow surface profile of the present invention;

[0043] Figure 4 is Figure 3 A partial view of the left view;

[0044] Figure 5 is a cross-sectional view of the narrow-profile section of the present invention;

[0045] Figure 6 is Figure 5 A partial view of the left view;

[0046] Figure 7 is a cross-sectional view of the narrow-profile section of the present invention;

[0047] Figure 8 is Figure 7 A partial view of the left view;

[0048] Figure 9 is a cross-sectional view of the narrow-profile section of the present invention;

[0049] Figure 10 is Figure 9 A partial view of the left view;

[0050] Figure 11 is a cross-sectional view of the narrow-profile section of the present invention;

[0051] Figure 12 is Figure 11 A partial view of the left view;

[0052] Figure 13 is a cross-sectional view of the narrow-profile section of the present invention;

[0053] Figure 14 is a cross-sectional view of the narrow-profile section of the present invention;

[0054] Figure 15 is a cross-sectional view of the narrow-profile section of the present invention;

[0055] Figure 16 is a cross-sectional view of the narrow-profile section of the present invention;

[0056] Figure 17 is a cross-sectional view of the narrow-profile section of the present invention;

[0057] Figure 18 is a cross-sectional view of the narrow-profile section of the present invention;

[0058] Figure 19 is a cross-sectional view of the narrow-profile section of the present invention;

[0059] Figure 20 is a cross-sectional view of the narrow-profile section of the present invention;

[0060] Figure 21 is a cross-sectional view of the narrow-profile section of the present invention;

[0061] Figure 22 It is a cross-sectional view of the narrow-profile section of the present invention;

[0062] Figure 23 It is a cross-sectional view of the narrow-profile section of the present invention;

[0063] Figure 24 It is a cross-sectional view of the narrow-profile section of the present invention;

[0064] Figure 25 It is a cross-sectional view of the narrow-profile section of the present invention;

[0065] Figure 26 It is a cross-sectional view of the narrow-profile section of the present invention;

[0066] Figure 27 It is a cross-sectional view of the narrow-profile section of the present invention;

[0067] Figure 28 It is a cross-sectional view of the narrow-profile section of the present invention;

[0068] Figure 29 It is a cross-sectional view of the narrow-profile section of the present invention;

[0069] Figure 30 It is a cross-sectional view of the narrow-profile section of the present invention;

[0070] Figure 31 It is a cross-sectional view of the narrow-profile section of the present invention;

[0071] Figure 32 It is a cross-sectional view of the narrow-profile section of the present invention;

[0072] Figure 33 It is a cross-sectional view of the narrow-profile section of the present invention;

[0073] Figure 34 It is a cross-sectional view of the narrow-profile section of the present invention;

[0074] Figure 35 It is a cross-sectional view of the narrow-profile section of the present invention;

[0075] Figure 36 It is a cross-sectional view of the narrow-profile section of the present invention;

[0076] Figure 37 It is a cross-sectional view of the narrow-profile section of the present invention;

[0077] Figure 38 It is a cross-sectional view of the narrow-profile section of the present invention. Detailed implementation mode

[0078] One of the embodiments is shown in Figure 1 As shown, the narrow-profile section is strip-shaped, as shown in Figure 2 As shown. Figure 2 It is Figure 1Partial view of the left view. There is a base [1], and a protrusion [2] is provided on the base [1], making the upper surface of the base [1] a small narrow surface. On the left side below the protrusion [2], there is a left step

[19] , and on the right side, there is a right step

[20] . The width of the left step

[19] is preferably equal to the width of the right step

[20] , and the protrusion [2] is located at the middle position between the left step

[19] and the right step

[20] . The upper surfaces of the left step

[19] and the right step

[20] are flat.

[0079] The width of the small narrow surface of the protrusion [2] can be ≤0.1 mm, preferably ≤0.06 mm, preferably ≤0.05 mm. Preferably ≤0.04 mm. Preferably ≤0.03 mm.

[0080] The protrusion [2] can be an arc surface or a circular arc surface; it can be a partial ellipse or a semi-ellipse; it can also be a small trapezoid; or it can be formed after setting a conical surface [4]; it can also be formed after setting a downward step [5]; and it can be an asymmetric trapezoid, etc. In addition, the lower part of the protrusion [2] is a small convex platform

[16] (the small convex platform

[16] can be a small trapezoid), and its upper part is composed of an arc surface or a circular arc surface, etc. The description will not be repeated hereafter.

[0081] Figure 3 It is on Figure 1 the basis that the upper left corner of the base [1] is made into an arc shape, and the upper right corner of the base [1] is made into an arc shape or a circular arc. Figure 4 It is Figure 3 Partial view of the left view.

[0082] Example two, see Figure 5 as shown. The narrow surface profile is strip-shaped, see Figure 6 as shown, Figure 6 It is Figure 5 Partial view of the left view. There is a base [1], and a convex platform [3] is provided on the base [1], and a protrusion [2] is provided on the convex platform [3], making the upper surface of the convex platform [3] a small narrow surface. On the left side below the protrusion [2], there is a left step

[19] , and on the right side, there is a right step

[20] . The width of the left step

[19] is preferably equal to the width of the right step

[20] , and the protrusion [2] is located at the middle position between the left step

[19] and the right step

[20] . The upper surfaces of the left step

[19] and the right step

[20] are conical surfaces [4].

[0083] The upper surfaces of the left step

[19] and the right step

[20] can be flat or conical surfaces [4], etc. The description will not be repeated hereafter.

[0084] An arc transition can be provided at the junction of the lower part of the protrusion [2] and the left step

[19] ; an arc transition can be provided at the junction of the lower part of the protrusion [2] and the right step

[20] . This can enhance the strength of the protrusion [2].

[0085] Example 3 is shown in Figure 5 As shown, the narrow-profile section is strip-shaped, as shown in Figure 6 shown. Figure 6 It is Figure 5 a partial view of the left view. There is a base body [1], a boss [3] is provided on the upper surface of the base body [1], and a protrusion [2] is provided on the upper surface of the boss [3]. The protrusion [2] is an arc surface or a circular arc surface, making the upper surface of the boss [3] a small narrow surface.

[0086] Example 4 is shown in Figure 7 As shown. The narrow-profile section is strip-shaped, as shown in Figure 8 shown. Figure 8 It is Figure 7 a partial view of the left view. There is a base body [1], a boss [3] is provided on the upper surface of the base body [1], and a protrusion [2] formed by a conical surface [4] is provided on the upper plane of the boss [3], making its upper plane a small narrow surface.

[0087] Example 5 is shown in Figure 9 As shown. The narrow-profile section is strip-shaped, as shown in Figure 10 shown, Figure 10 It is Figure 9 a partial view of the left view. There is a base body [1], a boss [3] is provided on the upper surface of the base body [1], and a protrusion [2] formed by a downward step [5] is provided on the upper plane of the boss [3], making its upper plane a small narrow surface.

[0088] Example 6 is shown in Figure 11 As shown. It is strip-shaped, as shown in Figure 12 shown, Figure 12 It is Figure 11 a partial view of the left view. There is a base body [1], a boss [3] is provided on the upper surface of the base body [1], and a protrusion [2] is provided on the upper surface of the boss [3]. The protrusion [2] is a small trapezoid, making the upper surface of the boss [3] a small narrow surface.

[0089] Example 7 is shown in Figure 13 As shown. The narrow-profile section is strip-shaped. There is a base body [1], a left boss [6] is provided on the upper left surface of the base body [1], and a protrusion [2] is provided on the upper surface of the left boss [6], making the upper surface of the left boss [6] a small narrow surface; a right boss [8] is provided on the upper right surface of the base body [1], and a protrusion [2] is provided on the upper surface of the right boss [8], making the upper surface of the right boss [8] a small narrow surface.

[0090] Example 8 is shown in Figure 13As shown in the figure. The narrow-profile section bar has a base body [1]. A left boss [6] is provided on the upper left surface of the base body [1]. A protrusion [2] is provided on the upper surface of the left boss [6]. The protrusion [2] is an arc surface or a circular arc surface, making the upper surface of the left boss [6] a small narrow surface. A right boss [8] is provided on the upper right surface of the base body [1]. A protrusion [2] is provided on the upper surface of the right boss [8]. The protrusion [2] is an arc surface or a circular arc surface, making the upper surface of the right boss [8] a small narrow surface.

[0091] For the ninth embodiment, see Figure 14 As shown in the figure. The narrow-profile section bar has a base body [1]. A left boss [6] is provided on the upper left surface of the base body [1]. A protrusion [2] is provided on the upper surface of the left boss [6]. A left step

[19] is provided on the left side of the protrusion [2]. The upper surface of the left step

[19] is a conical surface [4]. A right boss [8] is provided on the upper right surface of the base body [1]. A protrusion [2] is provided on the upper surface of the right boss [8]. A left step

[19] is provided on the left side of the protrusion [2]. The upper surface of the left step

[19] is a conical surface [4].

[0092] For the tenth embodiment, see Figure 15 、 Figure 16 、 Figure 17 As shown in the figure. For the narrow-profile section bar, the boss [3] is a trapezoidal or asymmetric trapezoidal boss.

[0093] For the eleventh embodiment, see Figure 18 As shown in the figure. The narrow-profile section bar has a base body [1]. On the upper left surface of the base body [1], a left boss [6] is provided. On the left side of the upper plane of the left boss [6], a protrusion [2] formed by a conical surface [4] is provided, making its upper plane a small narrow surface. On the upper right surface of the base body [1], a right boss [8] is provided. On the left side of the upper plane of the right boss [8], a protrusion [2] formed by a conical surface [4] is provided, making its upper plane a small narrow surface.

[0094] For the twelfth embodiment, see Figure 19 As shown in the figure. The narrow-profile section bar has a base body [1]. On the upper left surface of the base body [1], a left boss [6] is provided. On the right side of the upper plane of the left boss [6], a protrusion [2] formed by a downward step [5] is provided, making its upper plane a small narrow surface. On the upper right surface of the base body [1], a right boss [8] is provided. On the right side of the upper plane of the right boss [8], a protrusion [2] formed by a downward step [5] is provided, making its upper plane a small narrow surface.

[0095] For the thirteenth embodiment, see Figure 20As shown in the figure. There is a base body [1]. On the upper left surface of the base body [1], there is a left boss [6]. On the left boss [6], there is a protrusion [2]. The protrusion [2] is a small trapezoid, making the upper surface of the left boss [6] a small narrow surface. On the upper right surface of the base body [1], there is a right boss [8]. On the right boss [8], there is a protrusion [2]. The protrusion [2] is a small trapezoid, making the upper surface of the right boss [8] a small narrow surface.

[0096] Example No. 14, see Figure 21 、 Figure 22 As shown in the figure. For the said narrow surface profile, there is a lower conical surface [9] on the stepped surface.

[0097] Example No. 15, see Figure 23 As shown in the figure. Figure 23 This is based on Example No. 9 ( Figure 14 ). On the right side of the protrusion [2] provided on the left boss [6], there is a right step

[20] . The upper surface of the right step

[20] is a conical surface [4]. On the right side of the protrusion [2] provided on the right boss [8], there is a right step

[20] . The upper surface of the right step

[20] is a conical surface [4]. This further increases the strength of the left boss [6] and the right boss [8].

[0098] Example No. 16, see Figure 24 、 25 Figure, Figure 26 、 Figure 27 、 Figure 28 As shown in the figure. For the said narrow surface profile, a spring groove [7] can be provided below the base body [1].

[0099] Figure 29 This is based on Example No. 7. The base body is made into a thin shape (the height is made into a thin shape) to form a base body

[13] . A shallow spring groove

[10] is provided below the base body

[13] .

[0100] Figure 30 This is on the basis of Figure 3 . A boss [3] is formed on the arc surface (part of the arc surface) and the right side of the base body [1].

[0101] Figure 31 This is based on Example No. 1 and Figure 1 . On the left side of the protrusion [2] provided on the base body [1], there is a left step

[19] . The upper surface of the left step

[19] is a conical surface [4]. On the right side of the protrusion [2], there is a right step

[20] . The upper surface of the right step

[20] is a conical surface [4].

[0102] Figure 32 This is based on Example No. 7 ( Figure 13 ). The base body is made into a thin shape (the height is made into a thin shape) to form a base body

[13] , making it a flexible profile.

[0103] Figure 33 Based on Figure 1 on this basis, the small boss

[16] at the lower part of the protrusion [2] is a small trapezoid (trapezoid), and the upper part of the protrusion [2] is an arc surface or a circular arc surface.

[0104] Figure 34 Based on Figure 3 on this basis, the protrusion [2] on the substrate [1] has a small boss

[16] at its lower part which is an asymmetric trapezoid, and its upper part is an arc surface or a circular arc surface.

[0105] Figure 35 Based on the third embodiment, Figure 5 on this basis, the protrusion [2] provided on the upper surface of the boss [3] has a small boss

[16] at its lower part which is a small trapezoid, and its upper part is an arc surface or a circular arc surface.

[0106] Figure 36 Based on the seventh embodiment, Figure 13 on this basis, the protrusion [2] provided on the upper surface of the left boss [6] is a partial ellipse

[18] ; the protrusion [2] provided on the upper surface of the right boss [8] is a partial ellipse

[18] .

[0107] Figure 37 Based on the seventh embodiment, Figure 13 on this basis, the protrusion [2] provided on the upper surface of the left boss [6] has a small boss

[16] provided at its lower part which is a small trapezoid, and its upper part is an arc surface or a circular arc surface; the protrusion [2] provided on the upper surface of the right boss [8] has a small boss

[16] provided at its lower part which is a small trapezoid, and its upper part is an arc surface or a circular arc surface.

[0108] Figure 38 Based on Figure 37 on this basis, a spring groove [7] is provided at the lower part of the substrate [1].

[0109] Holes

[11] may be provided on the narrow - face profile substrate [1]. See Figure 28 as shown.

[0110] The small boss

[16] may be in the shape of a trapezoid (small trapezoid), an asymmetric trapezoid or a semi - trapezoid, etc.

[0111] This profile is in a long - strip shape. For the convenience of storage and transportation, the long - strip profile is often wound into a roll (similar to the roll of an electric wire).

[0112] The narrow - face steel profile of the present invention has the following particularly remarkable advantages:

[0113] The steel profile in the technical field of the present invention is provided with a small narrow surface with a protrusion [2] on the upper part of the narrow surface profile, which particularly significantly reduces the width of its upper surface. The small narrow surface with the protrusion [2] on this profile serves as the contact friction surface for further manufactured parts of other articles and the components that cooperate with it. It can significantly reduce the width of its upper surface, greatly reduce the contact area, reduce friction, and save energy. In addition, the height of the protrusion [2] can be within ≤0.11 mm to 0.02 mm. If the height of the protrusion [2] is less than 0.0, it is too low in height, and there will be wear due to friction and the service life is too short. If the height of the protrusion [2] is greater than 0.11 mm, it is too exposed and protruded. During the process of further manufacturing the profile into other parts of articles, it is prone to damage such as bumps and depressions, and the finished product rate is low; moreover, the protrusion [2] of the article parts further made from this profile is not firm enough. Especially in order to increase the wear resistance of the protrusion [2], nitriding treatment will be carried out on the upper surface of the profile. If the protrusion [2] is too high, nitriding cracks will penetrate, crack, or even break, and its finished product rate and reliability will be affected. The height of the protrusion [2] is preferably 0.02 mm to 0. In this way, not only can the articles further made from this profile achieve a satisfactory finished product rate during the manufacturing process, but also the service life is long enough and the reliability during use is good. It can avoid quality accidents caused by too high a height of the protrusion [2].

[0114] The height of the small boss

[16] can adjust the height of the protrusion [2] during design. The height of the protrusion [2] determines the service time, life, and reliability of the article parts made from this profile. The width of the small boss

[16] is related to the width of the protrusion [2] and determines the width of the contact surface of the article parts made from this profile. In addition, the shape of the small boss

[16] can be trapezoidal (small trapezoid), asymmetric trapezoidal, or semi-trapezoidal, etc. The angles and so on can be flexibly changed to meet the design requirements of various situations. It has better strength and use effect.

[0115] On the left side below the protrusion [2], there is a left step

[19] , and on the right side below the protrusion [2], there is a right step

[20] , making the base [1], the boss [3], the left boss [6], and the right boss [8] widened in a stepped shape. Especially when the protrusion [2] is located in the middle position between the left step

[19] and the right step

[20] , it can stably support the protrusion [2]. This gives the base [1] and the boss sufficient strength, and also ensures the sufficient strength, working reliability, and stability of the protrusion [2]. In addition, during the process of further manufacturing other article parts from the profile, it can prevent the cracking and nitriding crack penetration of parts such as the protrusion [2], protect the protrusion [2] from damage, and achieve a satisfactory finished product rate. And it ensures the reliability of use. It can prevent the nitriding layer from connecting and penetrating. It can eliminate the cracks or fractures in the nitriding layer of the protrusion [2]. Avoid quality accidents.

[0116] The protrusion [2] and the step [5] together (the downward step can be a minute step, for example, the size range of the downward step can be 0.02 mm to 0.09 mm), have appropriate width and strength. And the width of the boss [3] is ensured. It can avoid the dimensions of its part being too small (thin), so that the nitrided layer on the left side and the nitrided layer on the right side are connected and penetrated during nitriding. It can eliminate the cracks or fractures of the nitrided layer.

[0117] The upper surfaces of the left step

[19] and the right step

[20] are preferably flat. It is beneficial to protect the protrusion [2] from damage.

[0118] The angle between the conical surface [4] and the horizontal plane is preferably ≤ 11 degrees, so as to avoid the protrusion [2] protruding and isolated excessively and avoid cracks or fractures from occurring.

[0119] On this narrow surface profile, by setting the small narrow surface of the protrusion [2], the width of the contact surface between the parts of the articles made of this narrow surface profile and other mating parts can be greatly reduced. Therefore, the contact area can be greatly reduced, the friction force can be reduced, and the mechanical efficiency can be improved.

[0120] Especially for the articles made of the arc surface or circular arc surface in this profile, the friction surface in contact with its mating parts has good lubricity, strong pressure-bearing capacity, small contact area, and particularly good effect.

Claims

1. A narrow-profile section bar is in a long strip shape and has a substrate [1], characterized in that, There is a protrusion [2] on the upper surface of the substrate [1].

2. A narrow-profile section bar is in a long strip shape and has a matrix [1], and is characterized in that There is a boss [3] on the upper surface of the substrate [1], and a protrusion [2] is provided on the upper surface of the boss [3].

3. A narrow-profile section bar is strip-shaped, and is characterized in that, There is a substrate [1]. There is a left boss [6] on the upper left surface of the substrate [1], and a protrusion [2] is provided on the upper surface of the left boss [6]; there is a right boss [8] on the upper right surface of the substrate [1], and a protrusion [2] is provided on the upper surface of the right boss [8].

4. The narrow-profile section according to claims 1, 2, and 3, characterized in that, The height of the said protrusion [2] is ≤ 0.11 mm to 0.02 mm.

5. The narrow-profile section according to claims 1, 2 and 3, characterized in that, The said protrusion [2] is an arc surface or a circular arc surface.

6. The narrow-profile section according to claims 1, 2 and 3, characterized in that, The said protrusion [2] is a partial ellipse [18].

7. The narrow-profile section according to claims 1, 2 and 3, characterized in that, The said protrusion [2] is a small boss [16].

8. The narrow-profile section according to claims 1, 2 and 3, characterized in that, For the said protrusion [2], its lower part is a small boss [16], and its upper part is an arc surface or a circular arc surface.

9. The narrow-profile section according to claims 1, 2 and 3, characterized in that, There is a left step [19] on the left side under the said protrusion [2]; there is a right step [20] on the right side under the protrusion [2].

10. The narrow-profile section according to claims 1, 2, and 3, characterized in that, There is a left step [19] on the left side and a right step [20] on the right side under the said protrusion [2]; the width of the left step [19] is preferably equal to the width of the right step [20], and the protrusion [2] is preferably located at the middle position between the left step [19] and the right step [20].

11. The narrow-profile section according to claims 1, 2 and 3, characterized in that, The height of the said protrusion [2] is preferably 0.02 mm to 0.09 mm.

12. The narrow-profile section according to claims 1, 2, and 3, characterized in that, The width of the said protrusion [2] is < 0.06 mm, preferably ≤ 0.03 to 0.05 mm.

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