Tooth-shaped roller for conveying automobile heat treatment parts

Abstract

The utility model discloses a tooth-shaped roller for conveying automobile heat treatment parts, which comprises a roller base body, the surface of the roller base body is provided with continuously distributed tooth-shaped structures, the surface of each tooth-shaped structure is coated with a non-metal protective coating which is non-infiltrating with aluminum-silicon coating powder, and the non-metal protective coating is coated with an aluminum-silicon coating. Due to the tooth-shaped structure, the contact area of the parts and the roller is reduced by 40%-80%, the powder bonding amount is reduced, aluminum-silicon coating powder on the parts can be reserved in tooth-shaped gaps, but the powder is not pressed by the gravity of the parts and hardly permeates into the roller to erode a roller main body material, the erosion is small, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of automotive heat treatment component conveying technology, and in particular to a toothed roller for conveying automotive heat treatment components. Background Technology

[0002] In the hot stamping process of automotive parts, drum-type heating furnaces require the conveying of parts at high temperatures via drums. Existing technologies commonly use circular drums for conveying; for example, patent CN219586133U discloses a heat treatment device for automotive parts, which includes a treatment chamber, heat treatment components, a drive mechanism, and a heating system. Although this device optimizes the uniformity and efficiency of heat treatment through structures such as vertical pipes and conveying pipes, its conveying components still use traditional circular drums. However, circular drums have the following problems in practical use:

[0003] Because a small amount of aluminum-silicon coating powder on the parts will fall off and stick to the surface of the roller, the long-term adhesion and the continuous pressure of the parts on the surface of the circular roller will cause the aluminum-silicon coating powder to gradually penetrate into the inside of the roller and erode the roller material. This will cause the surface and inside of the roller to be subject to erosion and separation by inorganic non-metallic materials and metallic materials. Ultimately, the roller will break due to the difference in the expansion coefficients of the two materials when the roller is cooled and heated.

[0004] Therefore, even if other parts of the heat treatment device are improved in the existing technology, the technical problems of short roller life and high maintenance cost caused by aluminum-silicon coating erosion cannot be effectively solved if the structure of the conveying roller is not optimized. Utility Model Content

[0005] Purpose of the invention: The purpose of this utility model is to provide a toothed roller for conveying automotive heat treatment parts. The toothed structure reduces the contact area between the parts and the roller by 40%-80%, reducing the amount of powder adhesion. The aluminum-silicon coating powder on the parts will remain in the gaps between the teeth, but these powders are not suppressed by the gravity of the parts and rarely penetrate into the inside of the roller to corrode the main material of the roller. The corrosion is small and the service life is extended.

[0006] Technical solution:

[0007] A toothed roller for conveying automotive heat-treated parts includes a roller base, the surface of which is provided with a continuously distributed toothed structure, and the surface of the toothed structure is coated with a non-metallic protective coating that is non-wetting to aluminum-silicon coating powder.

[0008] Furthermore, multiple toothed structures are equidistantly arranged along the circumference of the drum base, and a single toothed structure penetrates the entire drum conveying space along the axial direction of the drum base.

[0009] Furthermore, multiple toothed structures are evenly distributed along the circumference and axial direction of the roller.

[0010] Furthermore, the non-metallic protective coating includes at least one of boron nitride coating and aluminum oxide coating.

[0011] Furthermore, the non-metallic protective coating is a polycrystalline material, composed of a mixture of boron nitride, aluminum oxide, and other materials.

[0012] Furthermore, the tooth-shaped cross-sectional shape of the tooth structure is one of trapezoidal, triangular or arc-shaped, and the ratio of the spacing between adjacent tooth structures to the tooth height is 1:0.2-4.

[0013] Furthermore, the height of the tooth-like structure is 0.5-15mm, and the spacing between adjacent tooth-like structures is 0.5-20mm.

[0014] Furthermore, the thickness of the non-metallic protective coating is 50-2000 μm.

[0015] Furthermore, the tooth tip width of the tooth structure is 0.5-15mm, and the tooth root width is 1-20mm.

[0016] Beneficial effects:

[0017] 1. The toothed structure reduces the contact area between the parts and the roller by 40%-80%, reducing the amount of powder adhesion. The aluminum-silicon coating powder on the parts will remain in the toothed gaps, but these powders are not suppressed by the gravity of the parts and rarely penetrate into the inside of the roller to corrode the main material of the roller. The corrosion is small and the service life is extended.

[0018] 2. The coating material applied to the toothed roller is boron nitride, aluminum oxide, etc. The main use of these two materials and the non-wetting properties of the aluminum-silicon coating powder on the components is to isolate the aluminum-silicon coating from the roller and prevent direct contact and corrosion. The roller will not break due to the difference in expansion coefficients of the two materials during cooling and heating after corrosion. In this way, the toothed roller with coating extends its service life and reduces the downtime of the heating furnace and the cost of replacing the roller. Attached Figure Description

[0019] Figure 1 This is a perspective view of Embodiment 1 of this utility model;

[0020] Figure 2 This is a cross-sectional view of Embodiment 1 of this utility model;

[0021] Figure 3 This is a perspective view of Embodiment 2 of this utility model;

[0022] Figure 4This is a cross-sectional view of Embodiment 3 of this utility model. Detailed Implementation

[0023] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1

[0025] like Figure 1 , 2 As shown, a toothed roller for conveying automotive heat-treated parts includes a roller base 1. The surface of the roller base 1 is provided with continuously distributed toothed structures 2. The surface of the toothed structures 2 is coated with a non-metallic protective coating that is non-wetting to the aluminum-silicon coating powder. The toothed structures reduce the contact area of ​​the parts (by more than 40%).

[0026] In this embodiment, the non-metallic protective coating includes at least one of a boron nitride coating and an aluminum oxide coating. The boron nitride coating does not wet the aluminum-silicon powder, preventing the powder from melting and penetrating at high temperatures. The surface energy of the two materials (boron nitride 32 mJ / m²) is... 2 Alumina 35mJ / m 2 Both are lower than the surface tension of aluminum-silicon melt (72 mJ / m). 2 This achieves physical isolation.

[0027] In this embodiment, multiple toothed structures are equidistantly arranged along the circumference of the roller base 1, and a single toothed structure 2 penetrates the entire roller conveying space along the axial direction of the roller base 1.

[0028] In this embodiment, the toothed structure 2 has a trapezoidal or arc-shaped cross-section, and the ratio of the spacing between adjacent toothed structures to the tooth height is 1:0.2-4. The trapezoidal structure has the best stability (compressive strength is 20% higher than that of the triangle), and the spacing-to-tooth height ratio ensures sufficient support while reducing contact during component transportation.

[0029] In this embodiment, a trapezoidal structure is used.

[0030] In this embodiment, the height of the tooth structure 2 is 0.5-15mm, and the spacing between adjacent tooth structures is 0.5-20mm.

[0031] In this embodiment, the thickness of the non-metallic protective coating is 50-2000 μm, and the thickness of the non-metallic protective coating at the tooth tip is greater than the thickness at the tooth root.

[0032] In this embodiment, the tooth tip width of the tooth structure 2 is 0.5-15mm, and the tooth root width is 1-20mm.

[0033] Example 2

[0034] like Figure 3 As shown, the toothed structure 2 has multiple teeth evenly distributed along the circumference and axial direction of the roller. The multiple axial teeth reduce the axial offset of the components and improve the heat dissipation rate.

[0035] Example 3

[0036] like Figure 4 As shown, in this embodiment, the tooth-shaped cross-section of the tooth structure 2 is arc-shaped. By utilizing the stress dispersion characteristics of curved surfaces, the problem of coating edge cracking at high temperatures can be solved, making it suitable for continuous production of high-precision parts.

[0037] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A toothed drum for conveying automotive heat treatment parts, characterized in that, The application relates to a roller body (1) provided with a continuous tooth structure (2) on the surface, and the surface of the tooth structure (2) is coated with a non-metal protective coating which is non-wetting with aluminum-silicon coating powder.

2. A toothed drum for conveying automotive heat treated parts according to claim 1, characterized in that, The tooth structures are equidistantly arranged along the circumference of the roller body (1), and each tooth structure (2) penetrates the whole roller conveying space along the axis of the roller body (1).

3. A toothed drum for conveying automotive heat treated parts as claimed in claim 1 wherein, The tooth structures (2) are arranged along the circumference and the axis of the roller.

4. A toothed drum for conveying automotive heat treated parts as claimed in claim 1 wherein, The non-metal protective coating comprises at least one of a boron nitride coating and an aluminum oxide coating.

5. A toothed drum for conveying car heat treatment parts according to claim 1 or 4, characterized in that, The non-metal protective coating is a polycrystalline substance composed of boron nitride, aluminum oxide and other materials.

6. A toothed drum for conveying automotive heat treated parts as claimed in claim 1 wherein, The tooth structure (2) has a trapezoidal or arc-shaped tooth section shape, and the ratio of the interval between adjacent tooth structures to the tooth height is 1:0.2-4.

7. A toothed drum for conveying automotive heat treated parts as claimed in claim 1 wherein, The height of the tooth structure (2) is 0.5-15 mm, and the interval between adjacent tooth structures is 0.5-20 mm.

8. A toothed drum for conveying automotive heat treated parts as claimed in claim 1, wherein, The thickness of the non-metal protective coating is 50-2000 microns.

9. A toothed drum for conveying automotive heat treated parts as claimed in claim 1, wherein, The tooth top width of the tooth structure (2) is 0.5-15 mm, and the tooth root width is 1-20 mm.

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