A roughening tool for the inner wall of a hole

Abstract

This utility model discloses a roughening tool for the inner wall of a hole, comprising a blade with multiple cutting grooves arranged at intervals along the edge of the blade, and a cutting section between adjacent cutting grooves; the extension lines of the two sides of the cutting section intersect, and the included angle between the extension lines of the two sides of the cutting section is α, where α is 10-25°. This utility model can effectively improve the adhesion of subsequent coatings on the product.

Description

Technical Field

[0001] This utility model relates to the technical field of roughening the inner wall of a hole, and in particular to a roughening tool for the inner wall of a hole. Background Technology

[0002] Hole inner wall roughening technology is one of the key processes in modern machining. In various industrial applications, hole inner wall roughening is particularly common in the manufacturing process of engine cylinder blocks. Its main purpose is to provide an ideal adhesion substrate for subsequent coatings on the engine cylinder block.

[0003] Because engine cylinder blocks using coating technology can reduce weight by 25-30 mm compared to traditional cast iron cylinder liners, while significantly improving wear resistance and heat transfer efficiency, traditional cast iron cylinder liners are gradually being replaced by thermal spray coatings. Therefore, roughening the inner wall of bores is becoming an increasingly crucial step in the engine cylinder block manufacturing process.

[0004] Currently, sandblasting is often used to roughen the surface of holes and enhance the adhesion of the coating. However, due to the problems of pollution and insufficient depth of sandblasting, the adhesion of the subsequent coating on the inner wall surface of the hole is unreliable, resulting in the coating peeling off. According to tests, the failure rate is usually over 45%. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a roughening tool for the inner wall of a hole, which can effectively improve the adhesion of subsequent coatings on the product.

[0006] To solve the above-mentioned technical problems, the borehole wall roughening tool provided by this utility model adopts the following technical solution:

[0007] A roughening tool for the inner wall of a hole includes a blade with multiple cutting grooves arranged at intervals along the edge of the blade, and a cutting section between two adjacent cutting grooves; the extension lines of the two sides of the cutting section intersect, and the included angle between the extension lines of the two sides of the cutting section is α, wherein α is in the range of 10-25°.

[0008] By employing the above technical solution, the blade, with its multiple cutting sections and grooves, cuts the inner wall surface of the product's hole to form grooves. Simultaneously, because the extended lines of the opposite edges of the cutting sections intersect at an angle, the opening of the groove on the product is narrowed, preventing the paint sprayed into the groove from flying out and ensuring a tighter adhesion of the sprayed coating to the inner wall surface of the product's hole. Furthermore, by controlling the angle between the extended lines of the two edges of the cutting sections to 10-25°, the groove formed by the cutting process not only prevents the sprayed paint from splashing out but also ensures that the paint smoothly enters the groove, improving the efficiency of high-adhesion spraying.

[0009] Optionally, α is 18°.

[0010] By adopting the above technical solution, when the included angle between the two extension lines is 18°, the possibility of paint splashing out of the groove sprayed into the product can be minimized, while ensuring that the paint enters the groove smoothly.

[0011] Optionally, the cross-sectional profile of the bottom wall of the cutting groove is arc-shaped.

[0012] By adopting the above technical solution, and by designing the cross-sectional profile of the bottom wall of the cutting groove as an arc, the stress concentration caused by the cutting part on both sides of the cutting groove when force is applied can be eliminated, thereby enhancing the structural strength of the cutting tool and improving the cutting stability of the cutting part.

[0013] Optionally, the radius of the circle containing the cross-sectional profile of the bottom wall of the cutting groove is R, and the range of R is 0.1-0.2 mm.

[0014] By adopting the above technical solution, the radius of the circle containing the bottom arc of the cutting groove is limited to 0.1-0.2mm, which can fully eliminate stress concentration while ensuring the depth of the groove formed on the product, so as to ensure the adhesion of the subsequent coating.

[0015] Optionally, the horizontal width of the cross-sectional profile of the bottom wall of the cutting groove is L1, and the range of L1 is 0.1-0.15mm.

[0016] By adopting the above technical solution, the horizontal width of the cross-sectional profile of the bottom wall of the cutting groove is limited to limit the distance between two adjacent cutting parts, thereby adjusting and controlling the spacing of multiple grooves formed on the product, so as to further improve the adhesion of the coating on the inner surface of the product hole.

[0017] Optionally, the cross-sectional profile of the top of the cutting part is stepped, with the small end of the cutting part on top, and a notch is formed between the small end and the large end of the cutting part.

[0018] By adopting the above technical solution, through the stepped arrangement and the notch formed between the small end and the large end of the cutting part, notches can be formed at the two corners of the top of the cutting part to eliminate the stress concentration phenomenon at the two corners of the cutting part when the blade applies force to cut the product.

[0019] Optionally, the width of the small end of the cutting part is L2, and the range of L2 is 0.13-0.18mm, and the width of the large end of the cutting part is L3, and the range of L3 is 0.15-0.25mm.

[0020] By adopting the above technical solution, the width of the large end and the small end of the cutting part is limited, and a notch of appropriate size can be formed on the cutting part, so as to eliminate stress concentration and enable the cutting part to achieve a sufficient cutting width.

[0021] In summary, this utility model has at least one of the following beneficial technical effects:

[0022] 1. By using the concave and convex arrangement of multiple cutting parts and cutting grooves, the cutting blade is used to cut the inner wall surface of the product's hole to form a groove on the product; at the same time, since the extension lines of the opposite two sides of the cutting part intersect and have an included angle, the opening of the groove on the product is narrowed, so that the paint sprayed into the groove on the product is not likely to fly out, and the formed spray coating can be more tightly embedded in the inner wall surface of the product's hole;

[0023] 2. Control the included angle between the extended lines of the two sides of the cutting part to 10-25°. The groove formed by the cutting can prevent the sprayed paint from splashing out, and at the same time ensure that the paint can enter the groove smoothly, thus improving the efficiency of high adhesion spraying.

[0024] 3. By designing the cross-sectional profile of the bottom wall of the cutting groove as an arc, the stress concentration caused by the cutting part on both sides of the cutting groove when force is applied can be eliminated, thereby enhancing the structural strength of the cutting tool and improving the cutting stability of the cutting part. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the hole inner wall roughening tool of this utility model.

[0026] Figure 2 yes Figure 1 A magnified structural diagram of part A in the middle.

[0027] Explanation of reference numerals in the attached drawings: 1. Blade; 2. Cutting groove; 3. Cutting section; 4. Notch. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-2 The present invention will be described in further detail below.

[0029] This utility model discloses a roughening tool for the inner wall of a hole. (Refer to...) Figure 1 and Figure 2 The bore roughening tool includes a blade 1, and multiple cutting grooves 2 are arranged at intervals along the edge of the blade 1. A cutting section 3 is formed between two adjacent cutting grooves 2. Through the concave and convex arrangement of the multiple cutting sections 3 and cutting grooves 2, the blade 1 is used to cut the inner wall surface of the product to form a groove on the product.

[0030] Reference Figure 1 and Figure 2 The extended lines of the two sides of the cutting part 3 intersect and form an angle, with the angle between them being α, ranging from 10-25°. In this embodiment, α is 18°. Because the extended lines of the opposite sides of the cutting part 3 intersect and form an angle, the opening of the groove on the product is made to contract, preventing the paint sprayed into the groove from flying out and ensuring that the formed coating layer is more tightly embedded in the inner wall surface of the product's hole. By controlling the angle between the extended lines of the two sides of the cutting part 3 to 10-25°, the groove formed by the cutting part prevents the sprayed paint from splashing out while ensuring that the paint smoothly enters the groove, improving the efficiency of high-adhesion spraying. When the angle between the two extended lines is 18°, the possibility of paint splashing out of the groove is minimized, while ensuring that the paint smoothly enters the groove.

[0031] Reference Figure 1 and Figure 2 The cross-sectional profile of the bottom wall of the cutting groove 2 is arc-shaped. The radius of the circle containing the cross-sectional profile of the bottom wall of the cutting groove 2 is R, which ranges from 0.1 to 0.2 mm. In this embodiment, R is 0.15 mm. By designing the cross-sectional profile of the bottom wall of the cutting groove 2 as arc-shaped, the stress concentration caused at the bottom wall of the cutting groove 2 when the cutting parts 3 on both sides of the cutting groove 2 are subjected to force can be eliminated, thereby enhancing the structural strength of the insert 1 and improving the cutting stability of the cutting parts 3. Limiting the radius of the circle containing the arc of the bottom wall of the cutting groove 2 to 0.1-0.2 mm ensures that stress concentration is effectively eliminated while maintaining the depth of the groove formed on the product to ensure the adhesion of the subsequent coating.

[0032] Reference Figure 1 and Figure 2 The horizontal width of the bottom wall cross-section of the cutting groove 2 is L1, which ranges from 0.1 to 0.15 mm. In this embodiment, L1 is 0.13 mm. By limiting the horizontal width of the bottom wall cross-section of the cutting groove 2, the distance between two adjacent cutting parts 3 is limited, thereby adjusting and controlling the spacing of the multiple grooves formed on the product, so as to further improve the adhesion of the coating on the inner surface of the product hole.

[0033] Reference Figure 1 and Figure 2The cross-sectional profile of the top of the cutting part 3 is stepped, with the smaller end of the cutting part 3 at the top, and a notch 4 formed between the smaller and larger ends of the cutting part 3. The width of the smaller end of the cutting part 3 is L2, ranging from 0.13 to 0.18 mm, and in this embodiment, the width of the smaller end of the cutting part 3 is 0.15 mm; the width of the larger end of the cutting part 3 is L3, ranging from 0.15 to 0.25 mm, and in this embodiment, L3 is 0.2 mm. Through the stepped design and the notch 4 formed between the smaller and larger ends of the cutting part 3, notches 4 can be formed at the two corners of the top of the cutting part 3 to eliminate stress concentration at the two corners of the cutting part 3 when the blade 1 applies force to cut the product. By limiting the width of the larger and smaller ends of the cutting part 3, a notch 4 of appropriate size can be formed on the cutting part 3, thereby eliminating stress concentration while ensuring sufficient cutting width.

[0034] The implementation principle of the hole inner wall roughening tool of this utility model embodiment is as follows: through the concave and convex arrangement of multiple cutting parts 3 and cutting grooves 2, the blade 1 is used to cut the inner wall surface of the product to form a groove on the product; at the same time, since the extension lines of the opposite two sides of the cutting parts 3 intersect and have an included angle, the opening of the groove on the product is made to be constricted, so that the paint sprayed into the groove on the product is not likely to fly out, and the formed spray coating can be more tightly embedded in the inner wall surface of the product.

[0035] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A hole wall roughening tool characterized by: Includes a blade (1), the blade (1) having multiple cutting grooves (2), the multiple cutting grooves (2) being arranged at intervals along the edge of the blade (1), and a cutting part (3) between two adjacent cutting grooves (2); the extension lines of the two sides of the cutting part (3) intersect, and the included angle between the extension lines of the two sides of the cutting part (3) is α, where α is 10-25°.

2. The borehole inner wall roughening tool according to claim 1, characterized in that: The value of α is 18°.

3. The borehole inner wall roughening tool according to claim 1, characterized in that: The cross-sectional profile of the bottom wall of the cutting groove (2) is arc-shaped.

4. The borehole inner wall roughening tool according to claim 3, characterized in that: The radius of the circle containing the cross-sectional profile of the bottom wall of the cutting groove (2) is R, and the range of R is 0.1-0.2 mm.

5. The borehole inner wall roughening tool according to claim 3, characterized in that: The horizontal width of the cross-sectional profile of the bottom wall of the cutting groove (2) is L1, and the range of L1 is 0.1-0.15mm.

6. The borehole inner wall roughening tool according to claim 1, characterized in that: The cross-sectional profile of the top of the cutting part (3) is stepped, with the small end of the cutting part (3) on top, and a notch (4) is formed between the small end and the large end of the cutting part (3).

7. A hole inner wall roughening tool according to claim 6, characterized in that: The width of the small end of the cutting part (3) is L2, and the range of L2 is 0.13-0.18mm. The width of the large end of the cutting part (3) is L3, and the range of L3 is 0.15-0.25mm.

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