Cast-in type burr-free cylinder liner and method for detecting the same

Abstract

The burr shape is provided to avoid the risk of poor heat dissipation due to insufficient coupling between the cylinder liner and the cylinder block. [Solution] The cylinder liner is cast into the cylinder block, and a plurality of burrs 3 are formed on the outer surface of the cylinder liner. At least one of the burrs 3 satisfies the condition that, in a cast-type burred cylinder liner, if L1 is the diameter at a position 0.25 mm from the top of the burr 3 and L2 is the diameter at a position 0.4 mm from the top of the burr 3, then the range of the ratio of diameter L1 to diameter L2 is 0.65 ≤ L1:L2 ≤ 1.15.

Description

Technical Field

[0001] The present invention relates to the technical field of cylinder liners and their detection, and specifically to cast-in cylinder liners with burrs and a method for detecting the same.

Background Art

[0002] A cast-in cylinder liner is a cylindrical component cast into a cylinder block. During the operation of an internal combustion engine, the inner surface of the cylinder liner is directly affected by high-temperature and high-pressure combustion gases and constantly undergoes high-speed sliding friction with the piston ring and piston skirt. Therefore, the cylinder liner needs to be firmly coupled with the cylinder block without displacement, and the heat on the surface of the cylinder liner can be conducted to, for example, the cylinder block, thereby ensuring that the cylinder liner maintains an appropriate temperature. That is, between the cylinder liner and the cylinder block, it is necessary to achieve both good bonding strength and excellent heat dissipation performance.

[0003] In the prior art, in order to increase the bonding strength between the cylinder liner and the engine block, a protruding structure, that is, a burr, is often provided on the surface of the cylinder liner. The shape of the burr is dumbbell-shaped, columnar, spike-shaped, eagle's claw-shaped, continuous spine-shaped, or worm-shaped, etc. The protruding structure is mainly dumbbell-shaped or spike-shaped. The specific shape and size of the burr all affect the bonding rate between the cylinder liner and the cylinder block. The bonding rate between the cylinder liner and the cylinder block has a great influence on the effective heat dissipation of the cylinder liner. By increasing the bonding rate between a single burr and the cylinder block and further increasing the bonding rate between the cylinder liner and the cylinder block, the heat dissipation of the cylinder liner can be effectively improved. Therefore, those skilled in the art need to study burrs of various shapes and consider how to effectively improve the bonding rate between the cylinder liner and the cylinder block.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Therefore, the technical problem that the present invention aims to solve is how to solve the problems of the prior art, which include insufficient coupling between a single burr and the cylinder block, insufficient coupling between the cylinder liner and the cylinder block, and poor heat dissipation of the cylinder liner.

[0005] Therefore, the present invention is A cast-in burred cylinder liner is manufactured from cast iron and cast into a cylinder block by a die-casting or gravity casting process, wherein a plurality of burrs are formed on the outer surface of the cylinder liner, and at least one of the burrs is If L1 is the diameter at a position 0.25 mm from the top of the burr, and L2 is the diameter at a position 0.4 mm from the top of the burr, then the range of the ratio of diameter L1 to diameter L2 satisfies the condition 0.65 ≤ L1:L2 ≤ 1.15. The invention provides a cast-in burred cylinder liner in which the burr includes a constricted projection, the projection having a constricted structure at a position 0.2 mm to 0.35 mm from the top of the burr, or the burr includes a sharp tapered projection.

[0006] In the above structure, the constricted projection is a dumbbell-shaped burr, which can be selected as such. At the position of the dumbbell-shaped burr with a diameter L1, there are points A1 and A3 on the outer contour of the dumbbell-shaped burr, and the connecting line between points A1 and A3 is the diameter L1. At the position of the dumbbell-shaped projection of the dumbbell-shaped burr, there is further point A2 at the tip of the outer contour, and points A2 and A1 are on the same longitudinal cross-section of the dumbbell-shaped burr, the connecting line between points A1 and A2 is connecting line A1A2, the connecting line between points A1 and A3 is connecting line A1A3, and the angle between the extension of connecting line A1A3 and connecting line A1A2 is α2. At a position of diameter L2 of the dumbbell-shaped burr, points A4 and A5 are located on the outer contour of the dumbbell-shaped burr, the connecting line between points A4 and A5 is diameter L2, points A4 and A1 are in the same longitudinal cross-section of the dumbbell-shaped burr, the connecting line between points A4 and A1 is connecting line A4A1, the connecting line between points A4 and A5 is connecting line A4A5, and the angle between connecting line A4A1 and connecting line A4A5 is α1. The range of the ratio of α1 to α2 is α1:α2≧0.5.

[0007] In the above structure, the range of the ratio of α1 to α2 is selectable, where α1:α2 ≤ 2.1.

[0008] In the above structure, the number of dumbbell-shaped burrs within a 1 square centimeter area of ​​the cylinder liner can be selected to be between 30 and 80.

[0009] In the above structure, the number of dumbbell-shaped burrs through which any 10 mm long line segment passes on the outer surface of the cylinder liner can be selected to be 4 to 8.

[0010] In the above structure, the sharp tapered projection is optionally a conical burr. At a position of diameter L1 of the conical burr, points A1 and A3 are located on the outer contour of the conical burr, the connecting line between points A1 and A3 is diameter L1, and point A2 is further located on the outer contour of the conical burr, point A2 is located 0.1 mm from the top of the burr, points A2 and A1 are on the same longitudinal cross-section of the conical burr, the connecting line between points A1 and A2 is connecting line A1A2, the connecting line between points A1 and A3 is connecting line A1A3, and the angle between connecting line A1A3 and connecting line A1A2 is α2. At a position of diameter L2 of the conical burr, points A4 and A5 are located on the outer contour of the conical burr, the connecting line between points A4 and A5 is diameter L2, points A4 and A1 are on the same longitudinal cross-section of the conical burr, the connecting line between points A4 and A1 is connecting line A4A1, the connecting line between points A4 and A5 is connecting line A4A5, and the angle between connecting line A4A1 and connecting line A4A5 is α1. The range of the ratio of α1 to α2 is α1:α2 ≥ 0.25.

[0011] In the above structure, the range of the ratio of α1 to α2 is selectable, where α1:α2 ≤ 1.0.

[0012] In the above structure, the number of conical burrs within a 1 square centimeter area in the cylinder liner can be selected to be between 45 and 85.

[0013] In the above structure, the number of conical burrs through which any 10 mm long line segment passes on the outer surface of the cylinder liner can be selected to be 6 to 11.

[0014] A method for detecting burrs in a cast-in burr-type cylinder liner, The method includes a method for detecting diameter values ​​at positions 0.25 mm and 0.4 mm from the top of the burr, the method being Step S101, in which the position of the end of the cylinder liner or the radially perpendicular cross-section of the cylinder liner is used as the detection surface, Step S102 involves placing the detection surface of the cylinder liner below the objective lens of the ultra-depth microscope, Step S103 involves rotating the coarse adjustment screw and the fine adjustment screw until a clear photograph of the subject is displayed on the computer screen. Step S104 is a step in which, based on the subject image of step S103, positions 0.25 mm and 0.4 mm from the top of the burr are identified vertically downward from the top of the burr, wherein the position from the top of the burr is selected from the highest point of the longitudinal cross-section of the burr, and the tolerance of the distance from the top of the burr is ±0.018 mm. A method for detecting burrs in a cast-in burred cylinder liner, comprising step S105, in step S104, detecting the numerical value of the intercept L1 at a position 0.25 mm from the top of the burr and the numerical value of the intercept L2 at a position 0.4 mm from the top of the burr, wherein the diameters at positions 0.25 mm and 0.4 mm from the top of the burr are the horizontal lengths of the longitudinal cross-section of the burr.

[0015] The above burr detection method is selectively used for the above-mentioned cast-in burr-equipped cylinder liner.

[0016] The above burr detection method is selectively used for the above-mentioned cast-in burr-equipped cylinder liner. The method for detecting the included angles α1 and α2 of the dumbbell-shaped burr (3) is as follows: Step S201 involves identifying positions 0.25 mm and 0.4 mm from the top of the dumbbell-shaped burr, respectively, according to steps S101 to S104, and In step S201, at a position 0.25 mm from the top of the burr, points A1 and A3 of the outer contour of the dumbbell-shaped burr are selected, and point A2 of the tip of the outer contour at the position of the dumbbell-shaped protrusion of the dumbbell-shaped burr is selected, where point A2 is the outermost position of the dumbbell-shaped protrusion in the longitudinal section of the burr in the ultra-depth-of-field microscope image in step S103, and the tolerance of the outermost position of the dumbbell-shaped protrusion is ±0.018 mm, and the angle α2 between the extension of connecting line A1A3 and connecting line A1A2 is measured using the angle measurement function of the ultra-depth-of-field microscope software. Step S202 involves selecting points A4 and A5 of the outer contour of the dumbbell-shaped burr at a position 0.4 mm from the top of the burr in step S201, and measuring the angle α1 between the connecting line A4A1 and the connecting line A4A5 using the angle measurement function of the ultra-depth microscope software.

[0017] The above burr detection method is selectively used for cast-in burr-equipped cylinder liners. The method for detecting the enclosing angles α1 and α2 of the conical burr is as follows: Step S301, which identifies positions 0.25 mm and 0.4 mm from the top of the conical burr, according to steps S101 to S104, At a position 0.25 mm from the top of the burr in the step S301, select points A1 and A3 on the outer contour of the conical burr. According to the super-depth-of-field microscope photograph in the step S103, identify a position 0.1 mm from the top of the burr downward along the vertical direction from the top of the burr. At the position 0.1 mm from the top of the burr, select point A2 from the outer contour of the longitudinal section of the burr in the super-depth-of-field microscope photograph. Measure the included angle α2 between the extension line of the connection line A1A3 and the connection line A1A2 by using the angle measurement function of the software of the super-depth-of-field microscope. In the step S302, at a position 0.4 mm from the top of the burr in the step S301, select points A4 and A5 on the outer contour of the conical burr, and measure the included angle α1 between the connection line A4A1 and the connection line A4A5 by using the angle measurement function of the software of the super-depth-of-field microscope.

[0018] In this embodiment, the steps of the measurement method of the bonding rate are specifically as follows.

[0019] Step S1: Die-cast the cylinder liner into the cylinder block. The melting aluminum smelting temperature is controlled within the range of 700 °C to 720 °C, the pouring temperature is controlled within the range of 650 °C to 680 °C, the preheating temperature of the cylinder liner is 130 to 150 °C, and a 28000 KN die-casting machine with a low-speed pressure injection speed of 0.2 m / s, a high-speed pressure injection speed of 5.5 m / s, and a final holding pressure of 45 MPa is used.

[0020] Step S2: Cut the die-cast cylinder block in a circumferential direction at a position 25 to 35 mm from the top of the cylinder liner, and cut the die-cast cylinder block in a circumferential direction at a position 25 to 35 mm from the end of the cylinder liner.

[0021] After that, grind the annular end faces at the top and the end of the above cylinder liner with sandpaper, and apply them to 180-mesh, 400-mesh, and 800-mesh water sandpaper, and grind the end faces with a grinding machine as needed.

[0022] Step S3: For the polished and ground cylinder liner, the coupling ratio between the aluminum cylinder block and the outer diameter of the cylinder liner is detected at the top and end of the cylinder liner. The specific detection locations are four cylinder liner outer diameter positions A with a circumference of 10 mm, spaced 90 degrees apart, as shown in Figure 6. The specific detection method is as follows.

[0023] Step S301: Using a super depth-of-field microscope, the length of the void ratio within a circumferential range of 10,000 μm along the surface of the burr is measured. Visual observation under the microscope reveals a gap between the aluminum cylinder block and the cast iron of the cylinder liner 1, meaning there is a void at that location. The length of this gap is measured as the length of the void.

[0024] Step S302: Calculate the coupling ratio between the aluminum cylinder block and the outer diameter of the cylinder liner using the coupling ratio calculation formula: Coupling Ratio = (100 - (sum(Gap Length)) 2 / 100000000))%, where the unit of length of the void is μm. The symbol "sum" means total sum. [Effects of the Invention]

[0025] The present invention has the following advantages.

[0026] 1. In the cast-in burred cylinder liner according to the present invention, a plurality of burrs are formed on the outer circumferential surface of the cylinder liner. The diameter at a position 0.25 mm from the top of the burr is defined as L1, and the diameter at a position 0.4 mm from the top of the burr is defined as L2. Furthermore, the range of the ratio of diameter L1 to diameter L2 is limited to 0.65 ≤ L1:L2 ≤ 1.15. The constricted projection has a constricted structure in the section from 0.2 mm to 0.35 mm from the top of the burr. Therefore, the position 0.25 mm from the top of the burr is within the constriction range of the dumbbell-shaped burr. Also, the position 0.4 mm from the top of the burr is on the outer surface of the burr close to the cylinder liner, and this position affects the bonding strength between the burr and the cylinder liner and the characteristics of the burr's shape. In this invention, the range of the ratio of diameter L1 to diameter L2 is limited to 0.65 ≤ L1:L2 ≤ 1.15. Within the above ratio range, the dumbbell-shaped burr is a projection exhibiting a constricted shape, and the conical burr is a sharp tapered projection. In these two types of burrs, the bonding rate between a single burr and the cylinder block is relatively high, thereby improving the bonding rate between the cylinder liner and the cylinder block, ensuring the overall structure of the cylinder liner and the heat transfer capacity of the cylinder block, and ensuring that the cylinder liner has excellent heat dissipation capacity.

[0027] 2. In the cast-in burred cylinder liner according to the present invention, at the position of the diameter L1 of the dumbbell-shaped burr, there are points A1 and A3 on the outer contour of the dumbbell-shaped burr, the connecting line between points A1 and A3 is the diameter L1, and at the position of the dumbbell-shaped protrusion of the dumbbell-shaped burr, there is further point A2 at the tip of the outer contour, points A2 and A1 are on the same longitudinal cross-section of the dumbbell-shaped burr, the connecting line between points A1 and A2 is connecting line A1A2, the connecting line between points A1 and A3 is connecting line A1A3, and the angle between the extension of connecting line A1A3 and connecting line A1A2 is α2. At a position of diameter L2 of the dumbbell-shaped burr, points A4 and A5 are located on the outer contour of the dumbbell-shaped burr, the connecting line between points A4 and A5 is diameter L2, points A4 and A1 are in the same longitudinal cross-section of the dumbbell-shaped burr, the connecting line between points A4 and A1 is connecting line A4A1, the connecting line between points A4 and A5 is connecting line A4A5, and the angle between connecting line A4A1 and connecting line A4A5 is α1. The range for the ratio of α1 to α2 is α1:α2≧0.5. Points A2 and A1 mentioned above are on the same cross-section of the ultra-depth microscope image, thereby effectively ensuring that points A2 and A1 lie on the same vertical plane of the dumbbell-shaped burr. Points A4 and A1 mentioned above are on the same cross-section of the ultra-depth microscope image, thereby effectively ensuring that points A4 and A1 lie on the same vertical plane of the dumbbell-shaped burr. Under the above conditions, the smaller the value of α1, the more likely the dumbbell-shaped burr is to become flatter in the area of ​​its outer circumferential surface closest to the cylinder liner, i.e., the middle and lower parts of the dumbbell-shaped burr. When the middle and lower parts of the dumbbell-shaped burr tend to become flatter, the connection surface between the dumbbell-shaped burr and the outer circumferential surface of the cylinder liner increases, and the dumbbell-shaped burr becomes firmly connected to the outer circumferential surface of the cylinder liner, making it less likely to break. Of course, if the value of α1 is too large, the bottom of the dumbbell-shaped burr on the cylinder liner will have a relatively large reverse taper, and when removing paint by blasting, foreign matter such as paint is likely to remain in the constricted area and base of the burr. As a result, when die-casting the cylinder liner, inclusions and pores are likely to occur at the connection surface between the base of the burr and the aluminum cylinder block, and furthermore, the bonding rate between the cylinder liner and the cylinder block decreases. Under the above conditions, α2 limits the structure of the constriction position of the dumbbell-shaped burr. When α2 is within an appropriate range, the coupling rate between a single burr and the cylinder block is relatively high, and the coupling rate between the cylinder liner and the cylinder block is also relatively high, thereby ensuring that the overall structure of the cylinder liner has excellent heat dissipation capabilities. Furthermore, in this invention, the range of the ratio of α1 to α2 in the dumbbell-shaped burr is limited to α1:α2≧0.5. Within the above range of the ratio of α1 to α2, the coupling rate between each burr and the cylinder block is relatively high, and the coupling rate between the cylinder liner and the cylinder block is also relatively high, thereby ensuring that the cylinder liner has excellent heat dissipation capabilities.

[0028] 3. In the cast-in burr-type cylinder liner according to the present invention, the range of the ratio of α1 to α2 in the dumbbell-shaped burr is limited to 0.5 ≤ α1:α2 ≤ 2.1. Within the above range of the ratio of α1 to α2, it is possible to ensure that the coupling rate between each burr and the cylinder block is relatively high, and that the overall structure of the cylinder liner has excellent heat dissipation capabilities.

[0029] 4. In the cast-in burred cylinder liner according to the present invention, the number of dumbbell-shaped burrs within a range of 1 square centimeter in the cylinder liner is 30 to 80. In this invention, the number of dumbbell-shaped burrs within a 1 square centimeter area is 30 to 80. More preferably, it is 30 to 55. An appropriate number of dumbbell-shaped burrs ensures a good coupling ratio between the outer surface of the cylinder liner and the cylinder block. This improved coupling ratio effectively ensures the overall heat dissipation capacity of the cylinder liner structure and increases the bonding strength between the cylinder liner structure and the cylinder block.

[0030] 5. In the cast-in burred cylinder liner according to the present invention, the surface is the dumbbell-shaped burr, and the number of dumbbell-shaped burrs through which any 10 mm long line segment on the outer surface of the cylinder liner passes is 4 to 8. By limiting the number of dumbbell-shaped burrs through which any 10mm long line segment passes on the outer surface of the cylinder liner, the burr density of dumbbell-shaped burrs on the outer surface of the cylinder liner can be effectively limited. An appropriate density of dumbbell-shaped burrs ensures a good coupling ratio between the outer surface of the cylinder liner and the cylinder block. This improved coupling ratio effectively ensures the overall heat dissipation capacity of the cylinder liner structure and increases the bonding strength between the cylinder liner structure and the cylinder block.

[0031] 6. In the cast-in burred cylinder liner according to the present invention, at a position of diameter L1 of the conical burr, there are points A1 and A3 on the outer contour of the conical burr, points A1 and A3 are located 0.25 mm from the top of the burr, the connecting line between points A1 and A3 is diameter L1, there is further point A2 on the outer contour of the conical burr, point A2 is located 0.1 mm from the top of the burr, points A2 and A1 are on the same longitudinal cross-section of the dumbbell-shaped burr, the connecting line between points A1 and A2 is connecting line A1A2, the connecting line between points A1 and A3 is connecting line A1A3, and the angle between connecting line A1A3 and connecting line A1A2 is α2. At a position of diameter L2 of the conical burr, points A4 and A5 are located on the outer contour of the conical burr, A4 and A5 are located 0.4 mm from the top of the burr, the connecting line between A4 and A5 is diameter L2, A4 and A1 are in the same longitudinal cross-section of the conical burr, the connecting line between A4 and A1 is connecting line A4A1, the connecting line between A4 and A5 is connecting line A4A5, and the angle between connecting line A4A1 and connecting line A4A5 is α1. The range of the ratio of α1 to α2 is α1:α2 ≥ 0.25. Points A2 and A1 mentioned above lie on the same cross-section of the ultra-depth microscope image, thereby effectively ensuring that points A2 and A1 lie on the same vertical plane of the conical burr. Points A4 and A1 mentioned above lie on the same cross-section of the ultra-depth microscope image, thereby effectively ensuring that points A4 and A1 lie on the same vertical plane of the conical burr. Point A2 is selected as being 0.1 mm from the top of the burr because the connecting line A1A2 is closer in shape to a conical burr. Furthermore, since the position 0.1 mm from the top of the burr is far from the flat part of the burr's top, it is less affected by the sudden flattening of the shape of the conical burr's top. Under the above conditions, the larger the value of α1, the more likely the position of the outer surface of the conical burr closest to the cylinder liner, i.e., the middle and lower part of the conical burr, is to become flatter. The flatter the middle and lower part of the conical burr becomes, the larger the connection surface between the conical burr and the outer surface of the cylinder liner, and the more firmly the conical burr is connected to the outer surface of the cylinder liner, making it less likely to break. Of course, if the value of α1 is too large, the conical burr on the cylinder liner will become a relatively large inverted cone, making it difficult to remove the paint from the base of the burr by blasting, and causing defects such as inclusions and pores to easily occur at the base of the burr during die casting, and further reducing the bonding rate. Under the above conditions, α2 limits the structure of the constriction position of the conical burr. When α2 is within an appropriate range, the coupling rate between a single burr and the cylinder block is relatively high, and the coupling rate between the cylinder block and the outer surface of the cylinder liner is also relatively high, thereby ensuring that the entire cylinder liner structure has excellent heat dissipation capabilities. Furthermore, in this invention, the range of the ratio of α1 to α2 is limited to α1:α2 ≥ 0.25. Within the above range of the ratio of α1 to α2, the coupling rate between the cylinder liner and the cylinder block is relatively high, thereby ensuring that the entire structure of the cylinder liner has excellent heat dissipation capabilities.

[0032] 7. In the cast-in burred cylinder liner according to the present invention, the range of the ratio of α1 to α2 in the conical burr is limited to 0.25 ≤ α1:α2 ≤ 1.0. Within the above range of the ratio of α1 to α2, it is possible to effectively ensure a relatively high coupling rate between each burr and the cylinder block, and to ensure that the entire structure of the cylinder liner has excellent heat dissipation capabilities.

[0033] 8. In the cast-in burred cylinder liner according to the present invention, the number of conical burrs within a range of 1 square centimeter in the cylinder liner is 45 to 85. In this invention, the number of conical burrs within a 1 square centimeter area is between 45 and 85. An appropriate number of conical burrs ensures a good coupling ratio between the outer surface of the cylinder liner and the cylinder block. This improved coupling ratio enhances the overall bonding strength between the cylinder liner structure and the cylinder block, while effectively ensuring the heat dissipation capacity of the entire cylinder liner structure.

[0034] 9. In the cast-in burred cylinder liner according to the present invention, the number of conical burrs through which any 10 mm long line segment passes on the outer surface of the cylinder liner is 6 to 11. By limiting the number of conical burrs through which any 10mm long line segment passes on the outer surface of the cylinder liner, the number and density of conical burrs on the outer surface of the cylinder liner can be effectively limited. With the above parameters, an appropriate conical burr density can ensure a good coupling ratio between the outer surface of the cylinder liner and the cylinder block. This improved coupling ratio effectively ensures the overall heat dissipation capacity of the cylinder liner structure and increases the coupling strength between the entire cylinder liner structure and the cylinder block.

[0035] 10. The method for detecting burrs in a cast-in burred cylinder liner according to the present invention includes a method for detecting diameter values ​​at positions 0.25 mm and 0.4 mm from the top of the burr. Specifically, it includes the following steps: Step S101: The position of the end of the cylinder liner, or the radially perpendicular cross-section of the cylinder liner, is used as the detection surface. In this step, by using the position of the end of the cylinder liner, or the radially perpendicular cross-section of the cylinder liner, the detection surface can be easily and simply found. Furthermore, in this invention, the specific position of the radially perpendicular cross-section of the cylinder liner is not limited. Step S102: The detection surface of the cylinder liner is placed under the objective lens of the ultra-depth microscope. Step S103: Rotate the coarse and fine adjustment screws until a clear photograph of the subject is displayed on the computer screen. In this step, the ultra-depth microscope is focused on the image of the detection surface. Specifically, in selecting burrs to be detected, select burrs whose longitudinal section is formed by cutting and whose longitudinal section is relatively complete. Relatively complete refers to a longitudinal section of a burr that is formed by cutting along the longitudinal section from a position close to the top of the burr. Step S104: Using the subject image from step S103, positions 0.25 mm and 0.4 mm from the top of the burr are identified vertically downward from the top of the burr. Here, the position from the top of the burr is selected from the highest point of the longitudinal section of the burr, and the tolerance for the distance from the top of the burr is ±0.018 mm. In the above step, the positions 0.25 mm and 0.4 mm from the top of the burr are identified from the subject image selected in step S103. Specifically, the vertical scribe function of the ultra-depth-of-field microscope is used to identify the positions 0.25 mm and 0.4 mm from the top of the burr. In this step, the position from the top of the burr is selected from the highest point of the longitudinal section of the burr, and the tolerance for the distance from the top of the burr is ±0.018 mm. This reduces the influence of human factors. Step S105: In step S104, the numerical value of section L1 at a position 0.25 mm from the top of the burr and the numerical value of section L2 at a position 0.4 mm from the top of the burr are detected. Here, the diameters at positions 0.25 mm and 0.4 mm from the top of the burr are the horizontal lengths of the longitudinal section of the burr. In this step, the horizontal scribe function of the ultra-depth microscope is used to measure the values ​​of the horizontal lengths at the above positions of 0.25 mm and 0.4 mm.

[0036] 11. In the method for detecting burrs in a cast-in type burr-equipped cylinder liner according to the present invention, the method for detecting the angle α1 and angle α2 of the dumbbell-shaped burr is as follows. Step S201: In accordance with steps S101 to S104, positions 0.25 mm and 0.4 mm from the top of the dumbbell-shaped burr are identified, respectively. In this step, the same measurement method as in steps S101 to S104 is used to identify positions 0.25 mm and 0.4 mm from the top of the dumbbell-shaped burr. Step S202: At a position 0.25 mm from the top of the burr in step S201, points A1 and A3 of the outer contour of the dumbbell-shaped burr are selected, and point A2 of the tip of the outer contour at the position of the dumbbell-shaped protrusion of the dumbbell-shaped burr is selected, where point A2 is the outermost position of the dumbbell-shaped protrusion in the longitudinal section of the burr in the ultra-depth microscope image in step S103. The angle measurement function of the ultra-depth microscope software is used to measure the angle α2 between the extension of the connecting line A1A3 and the connecting line A1A2. In this step, when selecting the positions of points A1 and A3 of the outer contour of the dumbbell-shaped burr, based on the position 0.25 mm from the top of the burr identified in step S201, the horizontal scribe function of the ultra-depth microscope is used to scribe through the above 0.25 mm position, and the points that intersect with the outer contour of the dumbbell-shaped burr are defined as points A1 and A3. Furthermore, when selecting point A2 in this step, the outermost position of the dumbbell-shaped protrusion in the longitudinal section of the burr in the ultra-depth-of-field microscope image is selected, and the tolerance for the above position selection is ±0.018 mm. This reduces the influence of human factors.

[0037] 12. In the method for detecting burrs in a cast-in type burr-equipped cylinder liner according to the present invention, the method for detecting the angle α1 and angle α2 of a conical burr is as follows. Step S301: In accordance with steps S101 to S104, positions 0.25 mm and 0.4 mm from the top of the conical burr are identified, respectively. In this step, the same measurement method as in steps S101 to S104 is used to identify positions 0.25 mm and 0.4 mm from the top of the conical burr. Step S302: At a position 0.25 mm from the top of the burr in step S301, points A1 and A3 of the outer contour of the conical burr are selected. Using the ultra-depth-of-field microscope image from step S103, a position 0.1 mm from the top of the burr is identified vertically downward from the top of the burr. At a position 0.1 mm from the top of the burr, point A2 is selected from the outer contour of the longitudinal section of the burr in the ultra-depth-of-field microscope image. The angle measurement function of the ultra-depth-of-field microscope software is used to measure the angle α2 between the extension of connecting line A1A3 and connecting line A1A2. In this step, when selecting the positions of points A1 and A3 on the outer contour of the conical burr, the horizontal scribing function of the super depth-of-field microscope is used to scribe through the 0.25 mm position based on the position 0.25 mm from the top of the burr identified in step S301, and the points where it intersects with the outer contour of the conical burr are designated as points A1 and A3. Furthermore, when selecting the position of point A2 on the outer contour of the conical burr, based on the position 0.1 mm from the top of the burr identified in step S301, the horizontal scribing function of the super depth-of-field microscope is used to scribe through the above 0.1 mm position, and point A2 is selected as the point that is close to point A1 and intersects with the outer contour of the conical burr. [Brief explanation of the drawing]

[0038] To more clearly illustrate specific embodiments of the present invention or technical solutions in the prior art, the drawings necessary for describing specific embodiments or the prior art will be briefly described below. Clearly, the drawings described below are some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these without any creative effort. [Figure 1] This is a schematic diagram showing the specific parameter positions in the longitudinal cross-section of the dumbbell-shaped burr according to the present invention. [Figure 2] This is a schematic diagram showing the positions of diameters L1 and L2 in the longitudinal cross-section of the conical burr according to the present invention. [Figure 3]This is a schematic diagram of the specific parameter positions in the longitudinal cross-section of the conical burr according to the present invention. [Figure 4] This is a cross-sectional view of the longitudinal section of the cylinder liner according to the present invention. [Figure 5] This is a schematic diagram illustrating the position of the detection surface at the end of the cylinder liner according to the present invention. [Figure 6] This is a schematic diagram illustrating the position of the end of the cylinder liner according to the present invention, and the position A of the outer diameter of the cylinder liner for detecting the coupling ratio. [Modes for carrying out the invention]

[0039] The technical solutions of the present invention will be described clearly and completely below with reference to the drawings, and it will be obvious that the embodiments described are some, but not all, embodiments of the present invention. Any other embodiments that a person skilled in the art could obtain without creative work based on the embodiments of the present invention are all within the scope of the present invention.

[0040] Furthermore, in the description of this invention, the directions or positional relationships indicated by terms such as "center," "up," "down," "left," "right," "vertical," "horizontal," "inside," and "outside" are directions or positional relationships based on the illustrations and are merely for the purpose of facilitating or simplifying the explanation of this invention. They do not indicate or imply that the device or element has a specific direction or is configured and operated in a specific direction, and should not be understood as limiting the invention. In addition, the terms "first," "second," and "third" are used solely for explanatory purposes and should not be understood as indicating or implying relative importance. Example 1 Referring to Figures 1 and 4, Figure 1 shows a schematic diagram of the position of a dumbbell-shaped burr in a longitudinal section according to specific parameters in an embodiment of the present invention, and Figure 4 is a cross-sectional view of the cylinder liner in a longitudinal section in an embodiment of the present invention.

[0041] As shown in Figure 5, the cast-in burred cylinder liner is manufactured from cast iron, cast into the cylinder block by a die-casting process, and has multiple burrs formed on its outer surface 2. At least one of the burrs satisfies the following conditions:

[0042] The aforementioned burr includes a projection exhibiting a constricted shape, and this projection has a constricted structure at a position 0.2 mm to 0.35 mm from the top of the burr. As shown in Figure 1, the above-mentioned constricted projection is a dumbbell-shaped burr 3.

[0043] In this embodiment, if L1 is the diameter of the dumbbell-shaped burr 3 at a position 0.25 mm from the top, and L2 is the diameter at a position 0.4 mm from the top, then the range of the ratio of diameter L1 to diameter L2 is 0.65 ≤ L1:L2 ≤ 1.15. Within this range of ratios, the coupling rate between a single burr and the cylinder block is relatively high, and the coupling strength between the burr and the cylinder block is ensured.

[0044] For specific experimental data, please refer to the table below.

[0045] JPEG2026086327000002.jpg77170

[0046] As can be seen from the table above, in this preferred embodiment of the present invention, when the range of the ratio of diameter L1 to diameter L2 is 0.65 ≤ L1:L2 ≤ 1, the coupling rate between the burr and the cylinder block is significantly greater when the range of the ratio of diameter L1 to diameter L2, L1:L2, is less than 0.65 or greater than 1.15. Here, the tools used to obtain the above data are a metal circular saw, model number: JC-130-NC, manufactured by Dongguan Jincheng Machinery Co., Ltd., used to cut the cylinder liner 1 radially. The tool model number of the ultra-depth microscope is VHX-2000, manufactured by Keyence Japan.

[0047] Furthermore, in this embodiment, in order to further increase the bonding strength between the cylinder liner 1 and the cylinder block, and to ensure that the dumbbell-shaped burr 3 is firmly connected to the outer peripheral surface 2 of the cylinder liner 1 and is resistant to breakage, the arrangement is as shown in Figure 1.

[0048] At the position of diameter L1 of the dumbbell-shaped burr 3, there are points A1 and A3 on the outer contour of the dumbbell-shaped burr 3, and the connecting line between points A1 and A3 is the diameter L1. At the position of the dumbbell-shaped projection of the dumbbell-shaped burr 3, there is further point A2 at the tip of the outer contour, and points A2 and A1 are in the same longitudinal cross-section of the dumbbell-shaped burr 3. The connecting line between points A1 and A2 is connecting line A1A2, the connecting line between points A1 and A3 is connecting line A1A3, and the angle between the extension of connecting line A1A3 and connecting line A1A2 is α2. The above α2 limits the structure of the constricted position of the dumbbell-shaped burr 3.

[0049] At a position of diameter L2 of the dumbbell-shaped burr 3, points A4 and A5 are located on the outer contour of the dumbbell-shaped burr 3, the connecting line between points A4 and A5 is diameter L2, points A4 and A1 are on the same longitudinal cross-section of the dumbbell-shaped burr 3, the connecting line between points A4 and A1 is connecting line A4A1, the connecting line between points A4 and A5 is connecting line A4A5, and the angle between connecting line A4A1 and connecting line A4A5 is α1. The larger the value of α1, the more likely the position of the outer circumferential surface 2 of the dumbbell-shaped burr 3 closest to the cylinder liner 1, i.e., the lower middle part of the dumbbell-shaped burr 3, is to become flatter. When the lower middle part of the dumbbell-shaped burr 3 tends to become flatter, the connection surface between the dumbbell-shaped burr 3 and the outer circumferential surface 2 of the cylinder liner 1 increases, and the dumbbell-shaped burr 3 is firmly connected to the outer circumferential surface 2 of the cylinder liner 1, making it less likely to break.

[0050] The range of the ratio of α1 to α2 is 2.1 ≥ α1:α2 ≥ 0.5. Within the above range of the ratio of α1 to α2, the coupling rate between a single burr and the cylinder block is relatively high, the coupling strength between the cylinder liner 1 and the cylinder block is excellent, and the dumbbell-shaped burr 3 is firmly connected to the outer circumferential surface 2 of the cylinder liner 1.

[0051] For specific experimental data, please refer to the table below.

[0052] JPEG2026086327000003.jpg77170

[0053] As can be seen from the table above, in this preferred embodiment of the present invention, when the range of the ratio of the angle α1 to the angle α2 is 2.1 ≥ α1:α2 ≥ 0.5, the coupling rate between the burr and the cylinder block is significantly greater when the range of the ratio of the angle α1 to the angle α2, α1:α2, is less than 0.5 or greater than 2.1. The tools used to obtain the above data are a metal circular saw, model number: JC-130-NC, manufactured by Dongguan Jincheng Machinery Co., Ltd., used to cut the cylinder liner 1 radially. The tool model number of the ultra-depth microscope is VHX-2000, manufactured by Keyence Japan.

[0054] In this embodiment, if the number of dumbbell-shaped burrs 3 is appropriate, it is possible to ensure a good coupling ratio between the multiple burrs in the cylinder liner 1 and the cylinder block, thereby increasing the coupling strength. In the cylinder liner 1, the number of dumbbell-shaped burrs 3 within a 1 square centimeter area is 30 to 80.

[0055] In this embodiment, if the density of the dumbbell-shaped burrs 3 is appropriate, it is possible to ensure a good bond ratio between the multiple burrs on the cylinder liner 1 and the cylinder block, thereby increasing the bond strength. The surface of the dumbbell-shaped burrs 3 is such that there are 4 to 8 dumbbell-shaped burrs 3 through which any 10 mm long line segment on the outer circumferential surface 2 of the cylinder liner 1 passes.

[0056] The method for detecting dumbbell-shaped burrs 3 in a cast-in burr-type cylinder liner is as follows: The method includes a method for detecting the diameter values ​​at positions 0.25 mm and 0.4 mm from the top of the burr, and the method is Step S101 involves setting the position of the end of the cylinder liner 1, or the radially perpendicular cross-section of the cylinder liner 1, as the detection surface 5, Step S102 involves placing the detection surface 5 of the cylinder liner 1 below the objective lens of the super depth microscope, Step S103 involves rotating the coarse adjustment screw and the fine adjustment screw until a clear photograph of the subject is displayed on the computer screen. Step S104 is a step in which, based on the subject image of step S103, positions 0.25 mm and 0.4 mm from the top of the burr are identified vertically downward from the top of the burr, wherein the position from the top of the burr is selected from the highest point of the longitudinal cross-section of the burr, and the tolerance of the distance from the top of the burr is ±0.018 mm. Step S105 includes detecting the numerical value of the intercept L1 at a position 0.25 mm from the top of the burr, and the numerical value of the intercept L2 at a position 0.4 mm from the top of the burr, wherein the diameters at positions 0.25 mm and 0.4 mm from the top of the burr are the horizontal lengths of the longitudinal section of the burr.

[0057] Furthermore, the method for detecting the gripping angles α1 and α2 of the dumbbell-shaped burr 3 is as follows: Step S201 involves identifying positions 0.25 mm and 0.4 mm from the top of the dumbbell-shaped burr 3, respectively, according to steps S101 to S104, and In step S201, at a position 0.25 mm from the top of the burr, points A1 and A3 of the outer contour of the dumbbell-shaped burr 3 are selected, and point A2 of the tip of the outer contour at the position of the dumbbell-shaped protrusion of the dumbbell-shaped burr 3 is selected, where point A2 is the outermost position of the dumbbell-shaped protrusion in the longitudinal section of the burr in the ultra-depth microscope image in step S103, and the tolerance of the outermost position of the dumbbell-shaped protrusion is ±0.018 mm, and the angle α2 between the extension of the connecting line A1A3 and the connecting line A1A2 is measured using the angle measurement function of the ultra-depth microscope software. Step S202 involves selecting points A4 and A5 on the outer contour of the dumbbell-shaped burr 3 at a position 0.4 mm from the top of the burr in step S201, and measuring the angle α1 between the connecting line A4A1 and the connecting line A4A5 using the angle measurement function of the ultra-depth microscope software.

[0058] In this example, the steps for measuring the binding rate are specifically as follows:

[0059] Step S1: The cylinder liner is die-cast into the cylinder block. A 28,000 KN die-casting machine is used, with the molten aluminum smelting temperature controlled to be within the range of 700°C to 720°C, the pouring temperature controlled to be within the range of 650°C to 680°C, the cylinder liner preheating temperature controlled to be within the range of 130°C to 150°C, a low-speed pressurized injection speed of 0.2 m / s, a high-speed pressurized injection speed of 5.5 m / s, and a final holding pressure of 45 MPa.

[0060] Step S2: The die-cast cylinder block is sliced ​​at a point 25-35 mm from the top of the cylinder liner, and the die-cast cylinder block is sliced ​​at a point 25-35 mm from the end of the cylinder liner.

[0061] Subsequently, the top and end ring faces of the cylinder liner are polished with sandpaper, then subjected to 180-mesh, 400-mesh, and 800-mesh wet sandpaper, respectively, and the end faces are polished with a grinding machine as needed.

[0062] Step S3: The coupling ratio between the aluminum cylinder block and the outer diameter of the cylinder liner is detected at the top and end of the polished cylinder liner. The specific detection locations are four cylinder liner outer diameter positions A, each with a circumference of 10 mm and spaced 90 degrees apart, as shown in Figure 6. The specific detection method is as follows.

[0063] Step S301: Using a super depth-of-field microscope, the length of the void ratio within a circumferential range of 10,000 μm along the surface of the burr is measured. Visual observation under the microscope reveals a gap between the aluminum cylinder block and the cast iron of the cylinder liner 1, meaning there is a void at that location. The length of this gap is measured as the length of the void.

[0064] Step S302: Calculate the coupling ratio between the aluminum cylinder block and the outer diameter of the cylinder liner using the coupling ratio calculation formula: Coupling Ratio = (100 - (sum(Gap Length)) 2 / 100000000))%, where the unit of length of the void is μm. The symbol "sum" means total sum.

[0065] Of course, in this embodiment, the number of dumbbell-shaped burrs 3 in the cylinder liner 1 is not particularly limited, and in other embodiments, the number of dumbbell-shaped burrs 3 within a 1 square centimeter area in the cylinder liner 1 may be less than 30 or more than 80.

[0066] Of course, in this embodiment, the range of the ratio of α1 to α2 is not particularly limited. In other embodiments, the range of the ratio of α1 to α2 may be α1:α2≦0.5, or the range of the ratio of α1 to α2 may be α1:α2≧2.1.

[0067] Of course, in this embodiment, the number of dumbbell-shaped burrs 3 through which any 10 mm long line segment on the outer circumferential surface 2 of the cylinder liner 1 passes is not particularly limited, and in other embodiments, the surface is the dumbbell-shaped burr 3, and the number of dumbbell-shaped burrs 3 through which any 10 mm long line segment on the outer circumferential surface 2 of the cylinder liner 1 passes may be less than 4 or more than 8.

[0068] Of course, in this embodiment, the specific method for casting the cylinder liner 1 into the cylinder block is not particularly limited, and in other embodiments, the cylinder liner 1 is manufactured from cast iron and cast into the cylinder block by a gravity casting process. Example 2

[0069] Referring to Figures 2 and 4, Figure 2 shows a schematic diagram of the positions of diameters L1 and L2 in the longitudinal section of a conical burr in an embodiment of the present invention, and Figure 4 is a cross-sectional view of the longitudinal section of a cylinder liner in an embodiment of the present invention.

[0070] As shown in Figure 5, the cast-in burred cylinder liner is manufactured from cast iron, cast into the cylinder block by a die-casting process, and has multiple burrs formed on its outer surface 2. At least one of the burrs satisfies the following conditions:

[0071] The aforementioned burr includes a sharp tapered projection. The sharp tapered projection is a conical burr 4, If L1 is the diameter of the burr at a position 0.25 mm from the top of the burr, and L2 is the diameter at a position 0.4 mm from the top of the burr, then the range of the ratio of diameter L1 to diameter L2 is 0.65 ≤ L1:L2 ≤ 1.15. Within this range of ratios, the coupling rate between a single burr and the cylinder block is relatively high, and the coupling strength between the burr and the cylinder block is ensured.

[0072] Furthermore, in this embodiment, in order to further increase the bonding strength between the cylinder liner 1 and the cylinder block, and to ensure that the conical burr 4 is firmly connected to the outer circumferential surface 2 of the cylinder liner 1 and is resistant to breakage, the schematic diagram of the position of the conical burr based on specific parameters in the longitudinal cross-section shown in Figure 3 is as follows.

[0073] At a position of diameter L1 of the conical burr 4, points A1 and A3 are located on the outer contour of the conical burr 4, the connecting line between points A1 and A3 is diameter L1, and point A2 is further located on the outer contour of the conical burr 4, point A2 is located 0.1 mm from the top of the burr, points A2 and A1 are on the same longitudinal cross-section of the conical burr 4, the connecting line between points A1 and A2 is connecting line A1A2, the connecting line between points A1 and A3 is connecting line A1A3, and the angle between connecting line A1A3 and connecting line A1A2 is α2. At a position of diameter L2 of the conical burr 4, points A4 and A5 are located on the outer contour of the conical burr 4, the connecting line between points A4 and A5 is diameter L2, points A4 and A1 are on the same longitudinal cross-section of the conical burr 4, the connecting line between points A4 and A1 is connecting line A4A1, the connecting line between points A4 and A5 is connecting line A4A5, and the angle between connecting line A4A1 and connecting line A4A5 is α1. The range of the ratio of α1 to α2 is 1.0 ≥ α1 : α2 ≥ 0.25.

[0074] For specific experimental data, please refer to the table below.

[0075] JPEG2026086327000004.jpg80170

[0076] As can be seen from the table above, in this preferred embodiment of the present invention, when the range of the ratio of the angle α1 to the angle α2 is 1.0 ≥ α1:α2 ≥ 0.25, the coupling rate between the burr and the cylinder block is significantly greater when the range of the ratio of the angle α1 to the angle α2, α1:α2, is less than 0.25 or greater than 1.0. Here, the tools used to obtain the above data are a metal circular saw, model number: JC-130-NC, manufactured by Dongguan Jincheng Machinery Co., Ltd., used to cut the cylinder liner 1 radially. The tool model number of the ultra-depth microscope is VHX-2000, manufactured by Keyence Japan.

[0077] In this embodiment, if the number of conical burrs 4 is appropriate, it is possible to ensure a good coupling ratio between the multiple burrs in the cylinder liner 1 and the cylinder block, thereby increasing the coupling strength. The number of conical burrs 4 within a 1 square centimeter area in the cylinder liner 1 is between 45 and 85.

[0078] In this embodiment, if the burr density of the conical burrs 4 is appropriate, it is possible to ensure a good coupling ratio between the multiple burrs on the cylinder liner 1 and the cylinder block, thereby increasing the coupling strength. The number of conical burrs 4 on the surface is 6 to 11, through which any 10 mm long line segment of the outer circumferential surface 2 of the cylinder liner 1 passes.

[0079] The method for detecting burrs in cast-in burr cylinder liners is: The method includes detecting the diameter values ​​of the conical burr 4 at positions 0.25 mm and 0.4 mm from the apex, and the method is Step S101 involves setting the position of the end of the cylinder liner 1, or the radially perpendicular cross-section of the cylinder liner 1, as the detection surface 5, Step S102 involves placing the detection surface 5 of the cylinder liner 1 below the objective lens of the super depth microscope, Step S103 involves rotating the coarse adjustment screw and the fine adjustment screw until a clear photograph of the subject is displayed on the computer screen. Step S104 is a step in which, based on the subject image of step S103, positions 0.25 mm and 0.4 mm from the top of the burr are identified vertically downward from the top of the burr, wherein the position from the top of the burr is selected from the highest point of the longitudinal cross-section of the burr, and the tolerance of the distance from the top of the burr is ±0.018 mm. Step S105 includes detecting the numerical value of the intercept L1 at a position 0.25 mm from the top of the burr, and the numerical value of the intercept L2 at a position 0.4 mm from the top of the burr, wherein the diameters at positions 0.25 mm and 0.4 mm from the top of the burr are the horizontal lengths of the longitudinal section of the burr.

[0080] The method for detecting the included angles α1 and α2 of the conical burr 4 is as follows: Step S301 involves identifying positions 0.25 mm and 0.4 mm from the top of the conical burr 4, respectively, according to steps S101 to S104, and In step S301, at a position 0.25 mm from the top of the burr, points A1 and A3 of the outer contour of the conical burr 4 are selected, and in step S103, using the ultra-depth-of-field microscope image, a position 0.1 mm from the top of the burr is identified vertically downward from the top of the burr, and at a position 0.1 mm from the top of the burr, point A2 is selected from the outer contour of the longitudinal section of the burr in the ultra-depth-of-field microscope image, and the angle α2 between the extension of connecting line A1A3 and connecting line A1A2 is measured using the angle measurement function of the ultra-depth-of-field microscope software. Step S302 involves selecting points A4 and A5 on the outer contour of the conical burr 4 at a position 0.4 mm from the top of the burr in step S301, and measuring the angle α1 between the connecting line A4A1 and the connecting line A4A5 using the angle measurement function of the ultra-depth-of-field microscope software.

[0081] In this example, the steps for measuring the binding rate are specifically as follows:

[0082] Step S1: The cylinder liner is die-cast into the cylinder block. A 28,000 KN die-casting machine is used, with the molten aluminum smelting temperature controlled to be within the range of 700°C to 720°C, the pouring temperature controlled to be within the range of 650°C to 680°C, the cylinder liner preheating temperature controlled to be 130-150°C, and the low-speed pressurized injection speed set to 0.2 m / s, the high-speed pressurized injection speed set to 5.5 m / s, and the final holding pressure set to 45 MPa.

[0083] Step S2: The die-cast cylinder block is sliced ​​at a point 25-35 mm from the top of the cylinder liner, and the die-cast cylinder block is sliced ​​at a point 25-35 mm from the end of the cylinder liner.

[0084] Subsequently, the top and end ring faces of the cylinder liner are polished with sandpaper, then subjected to 180-mesh, 400-mesh, and 800-mesh wet sandpaper, respectively, and the end faces are polished with a grinding machine as needed.

[0085] Step S3: The coupling ratio between the aluminum cylinder block and the outer diameter of the cylinder liner is detected at the top and end of the polished cylinder liner. The specific detection locations are four cylinder liner outer diameter positions A, each with a circumference of 10 mm and spaced 90 degrees apart, as shown in Figure 6. The specific detection method is as follows.

[0086] Step S301: Using a super depth-of-field microscope, the length of the void ratio within a circumferential range of 10,000 μm along the surface of the burr is measured. Visual observation under the microscope reveals a gap between the aluminum cylinder block and the cast iron of the cylinder liner 1, meaning there is a void at that location. The length of this gap is measured as the length of the void.

[0087] Step S302: Calculate the coupling ratio between the aluminum cylinder block and the outer diameter of the cylinder liner using the coupling ratio calculation formula: Coupling Ratio = (100 - (sum(Gap Length)) 2 / 100000000))%, where the unit of length of the void is μm. The symbol "sum" means total sum.

[0088] Of course, in this embodiment, the range of the ratio of α1 to α2 is not particularly limited, and in other embodiments, the range of the ratio of α1 to α2 may be α1:α2<0.25 or α1:α2>1.0.

[0089] Of course, in this embodiment, the number of conical burrs 4 in the cylinder liner 1 is not particularly limited, and in other embodiments, the number of conical burrs 4 within a 1 square centimeter area in the cylinder liner 1 may be less than 45 or more than 85.

[0090] Of course, in this embodiment, the number of conical burrs 4 through which any 10 mm long line segment of the outer circumferential surface 2 of the cylinder liner 1 passes is not particularly limited, and in other embodiments, the number of dumbbell-shaped burrs 3 through which any 10 mm long line segment of the outer circumferential surface 2 of the cylinder liner 1 passes may be less than 6 or more than 11.

[0091] Of course, in this embodiment, the specific method for casting the cylinder liner 1 into the cylinder block is not particularly limited, and in other embodiments, the cylinder liner 1 is manufactured from cast iron and cast into the cylinder block by a gravity casting process.

[0092] Clearly, the above embodiments are merely illustrative examples for clarity and do not limit the embodiments. Those skilled in the art can make various other forms of variations or modifications based on the above description. It is not necessary, nor is it possible, to cover all embodiments here. Any obvious variations or modifications arising therefrom still fall within the scope of the present invention. [Explanation of symbols]

[0093] 1 Cylinder Liner 2 Outer surface 3. Dumbbell-shaped burrs 4. Conical burrs 5 Detection surface

Claims

1. A cast-type burred cylinder liner is characterized in that the cylinder liner (1) is made of cast iron and cast into a cylinder block by a die-casting or gravity casting process, and a plurality of burrs are formed on the outer circumferential surface (2) of the cylinder liner (1), At least one in Bali, The diameter at a position 0.25 mm from the top of the burr is L. １ The diameter at a position 0.4 mm from the top of the burr is L ２ Therefore, diameter L １ Diameter L ２ The range of the ratio to is 0.65 ≤ L １ : L ２ Satisfying the condition ≤ 1.15, A cast-in burred cylinder liner characterized in that the burr includes a constricted projection, the projection having a constricted structure at a position 0.2 mm to 0.35 mm from the top of the burr, or the burr includes a sharp tapered projection.

2. The constricted projection is a dumbbell-shaped burr (3), The diameter L of the dumbbell-shaped burr (3) １ At the position of, on the outer contour of the dumbbell-shaped burr (3), there are points A １ and A ３ points, and the connecting line between point A １ and point A ３ is the diameter L １ and at the position of the dumbbell-shaped protrusion of the dumbbell-shaped burr (3), there is further a point A ２ at the tip of the outer contour, and points A ２ and A １ are in the same longitudinal section of the dumbbell-shaped burr (3), and the connecting line between point A １ and point A ２ is connecting line A １ A ２ and the connecting line between point A １ and point A ３ is connecting line A １ A ３ and the included angle between the extension line of connecting line A １ A ３ and connecting line A １ A ２ is taken as α2 Diameter L of the dumbbell-shaped burr (3) ２ At the position, A is located on the outer contour of the dumbbell-shaped burr (3). ４ Point and A ５ There is a point, A ４ Point and A ５ The connecting line to the point is the diameter L ２ And so, A ４ Point and A １ The point is located in the same longitudinal section of the dumbbell-shaped burr (3), A ４ Point and A １ The connecting line to the point is connecting line A. ４ A １ A ４ Point and A ５ The connecting line to the point is connecting line A. ４ A ５ , connecting line A ４ A １ and connecting line A ４ A ５ The included angle between and is denoted as α1. The cast-in burr-coated cylinder liner according to claim 1, characterized in that the range of the ratio of α1 to α2 is α1:α2≧0.

5.

3. The cast-in burr cylinder liner according to claim 2, characterized in that the range of the ratio of α1 to α2 is α1:α2 ≤ 2.

1.

4. The cast-in burred cylinder liner according to claim 2 or 3, characterized in that the number of dumbbell-shaped burrs (3) within a range of 1 square centimeter in the cylinder liner (1) is 30 to 80.

5. The cast-in burred cylinder liner according to claim 2 or 3, characterized in that the number of dumbbell-shaped burrs (3) through which any 10 mm long line segment on the outer circumferential surface (2) of the cylinder liner (1) passes is 4 to 8.

6. The sharp, tapered projection is a conical burr (4), The diameter L of the conical burr (4) １ At the position, A １ Point and A ３ There is a point, A １ Point and A ３ The connecting line to the point is the diameter L １ As a result, A is formed on the outer contour of the conical burr (4). ２ There is another point, A ２ The point is located 0.1 mm from the top of the burr, A ２ Point and A １ The point is located in the same longitudinal section of the conical burr (4), A １ Point and A ２ The connecting line to the point is connecting line A. １ A ２ A １ Point and A ３ The connecting line to the point is connecting line A. １ A ３ , connecting line A １ A ３ and connecting line A １ A ２ The included angle between and is denoted as α2. The diameter L of the conical burr (4) ２ At the position, A ４ Point and A ５ There is a point, A ４ Point and A ５ The connecting line to the point is the diameter L ２ And so, A ４ Point and A １ The point is located in the same longitudinal section of the conical burr (4), A ４ Point and A １ The connecting line to the point is connecting line A. ４ A １ A ４ Point and A ５ The connecting line to the point is connecting line A. ４ A ５ , connecting line A ４ A １ and connecting line A ４ A ５ The included angle between and is denoted as α1. The cast-in burr cylinder liner according to claim 1, characterized in that the range of the ratio of α1 to α2 is α1:α2≧0.

25.

7. The cast-in burr cylinder liner according to claim 6, characterized in that the range of the ratio of α1 to α2 is α1:α2 ≤ 1.

0.

8. The cast-in burred cylinder liner according to claim 6 or 7, characterized in that the number of conical burrs (4) within a range of 1 square centimeter in the cylinder liner (1) is 45 to 85.

9. The cast-in burred cylinder liner according to claim 6 or 7, characterized in that the number of conical burrs (4) through which any 10 mm long line segment on the outer circumferential surface (2) of the cylinder liner (1) passes is 6 to 11.

10. A method for detecting burrs in a cast-in burr-type cylinder liner, The method includes a method for detecting diameter values ​​at positions 0.25 mm and 0.4 mm from the top of the burr, the method being Step S101, in which the position of the end of the cylinder liner (1) or the radially perpendicular cross-section of the cylinder liner (1) is used as the detection surface (5), Step S102 involves placing the detection surface (5) of the cylinder liner (1) below the objective lens of the super depth microscope, Step S103 involves rotating the coarse adjustment screw and the fine adjustment screw until a clear photograph of the subject is displayed on the computer screen. Step S104 is a step in which, based on the subject image of step S103, positions 0.25 mm and 0.4 mm from the top of the burr are identified vertically downward from the top of the burr, wherein the position from the top of the burr is selected from the highest point of the longitudinal cross-section of the burr, and the tolerance of the distance from the top of the burr is ±0.018 mm. In the step S104, a section L at a position 0.25 mm from the top end of the burr １ and a numerical value of a section L at a position 0.4 mm from the top end of the burr ２ are detected, and the diameters at positions 0.25 mm and 0.4 mm from the top end of the burr are the horizontal lengths of the longitudinal section of the burr, which includes step S105. A method for detecting a burr of a cylinder liner with a cast-in burr, characterized by the above.

11. The method for detecting burrs in a cast-in type burr-type cylinder liner according to claim 10, characterized in that the burr detection method is used in the cast-in type burr-type cylinder liner according to claim 1.

12. The burr detection method described above is used for a cast-in burr-equipped cylinder liner according to any one of claims 2 to 5. The method for detecting the angle α1 and angle α2 of the dumbbell-shaped burr (3) is as follows: Step S201, which identifies positions 0.25 mm and 0.4 mm from the top of the dumbbell-shaped burr (3), according to steps S101 to S104, At a position 0.25 mm from the top of the burr in the step S201, A of the outer contour of the dumbbell-shaped burr (3) １ point and A ３ point are selected, and the tip A of the outer contour at the position of the dumbbell-shaped protrusion of the dumbbell-shaped burr (3) ２ point is selected. Here, the A ２ point is the outermost position of the dumbbell-shaped protrusion in the longitudinal section of the burr in the super-depth-of-field microscopic photograph in the step S103, and the allowable error of the outermost position of the dumbbell-shaped protrusion is ±0.018 mm. By the angle measurement function of the software of the super-depth-of-field microscope, the included angle α2 between the extension line of the connection line A １ A ３ and the connection line A １ A ２ is measured. At a position 0.4 mm from the top of the burr in step S201, the outer contour of the dumbbell-shaped burr (3) is A ４ Point and A ５ Select a point and use the angle measurement function of the ultra-depth microscope software to determine the connection line A. ４ A １ and connecting line A ４ A ５ The method for detecting burrs in a cast-in burred cylinder liner according to claim 10, characterized in that step S202 is to measure the angle α1 between the burrs and the burrs.

13. The burr detection method described above is used for a cast-in burr-equipped cylinder liner according to any one of claims 6 to 9. The method for detecting the enclosing angles α1 and α2 of the conical burr (4) is as follows: Step S301, which identifies positions 0.25 mm and 0.4 mm from the top of the conical burr (4), according to steps S101 to S104, At a position 0.25 mm from the top of the burr in step S301, the outer contour of the conical burr (4) is A １ Point and A ３ A point is selected, and the ultra-depth-of-field microscope image from step S103 identifies a position 0.1 mm from the top of the burr, downward from the top of the burr, along the vertical direction, and at a position 0.1 mm from the top of the burr, A is determined from the outer contour of the longitudinal cross-section of the burr in the ultra-depth-of-field microscope image. ２ Select a point and use the angle measurement function of the ultra-depth microscope software to determine the connection line A. １ A ３ Extension line and connecting line A １ A ２ The included angle α2 between and is measured, At a position 0.4 mm from the top of the burr in step S301, the outer contour of the conical burr (4) is A ４ Point and A ５ Select a point and use the angle measurement function of the ultra-depth microscope software to determine the connection line A. ４ A １ and connecting line A ４ A ５ The method for detecting burrs in a cast-in burred cylinder liner according to claim 10, characterized in that step S302 is to measure the angle α1 between the burrs and the burrs.

14. The method for detecting burrs in the cast-in type burr-coated cylinder liner is the L of the cast-in type burr-coated cylinder liner according to claims 1 to 11. １ and L ２ A method for detecting burrs in a cast-in burr-equipped cylinder liner according to claim 10, characterized in that it is used to detect burrs.

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