Burr-shaped cast-in type cylinder sleeve and detection method thereof

Abstract

The invention relates to the technical field of cylinder sleeves and detection thereof, in particular to a burr-shaped cast-in type cylinder sleeve and a detection method thereof. The cylinder sleeve is made of cast iron and is cast into the cylinder body through a die-casting or gravity casting process, and a plurality of burrs are formed on the peripheral face of the cylinder sleeve. At least one burr meets the following conditions: in the burr-shaped cast-in cylinder sleeve, the diameter of the burr at the position 0.25 mm away from the top end is L1, and the diameter of the burr at the position 0.4 mm away from the top end is L2; and the ratio of the diameter L1 to the diameter L2 is more than or equal to 0.65 and less than or equal to 1.15. The specific shapes of the burrs are limited by limiting the diameter sizes of the two special positions, away from the top end, of the burrs, so that the binding rate between the single burrs and the cylinder body and the binding rate between the cylinder sleeve and the cylinder body are guaranteed, good heat dissipation performance between the cylinder sleeve and the cylinder body is guaranteed, and it is guaranteed that the cylinder sleeve does not deform in the working process.

Description

Technical Field

[0001] The invention relates to the technical field of cylinder sleeves and detection thereof, and in particular to a burr-shaped cast-in cylinder sleeve and a detection method thereof. Background Art

[0002] The cast-in cylinder liner is a cylindrical part that is cast into the cylinder block. During the operation of the internal combustion engine, the inner surface of the cylinder liner is directly affected by high-temperature and high-pressure combustion gas, and always has high-speed sliding friction with the piston ring and piston skirt. Therefore, the cylinder liner must be well combined with the cylinder block and will not move. At the same time, it can conduct the heat on the surface of the cylinder liner to the cylinder block, thereby ensuring that the cylinder liner maintains an appropriate temperature, that is, there is both good bonding strength and excellent heat dissipation performance between the cylinder liner and the cylinder block.

[0003] In the prior art, in order to increase the bonding strength between the cylinder liner and the engine block, a raised structure, i.e., burrs, is usually provided on the surface of the cylinder liner. The burrs are in the following shapes: dumbbell-shaped, columnar, spike-shaped, eagle-shaped, or thorn-shaped, worm-shaped, etc. The raised structure is mainly in the shape of a dumbbell or a spike. The specific shape and size of the burrs will 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 then 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 different shapes and how to effectively improve the bonding rate between the cylinder liner and the cylinder block. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is how to solve the problem of insufficient bonding rate between a single burr and the cylinder body, and insufficient bonding rate between the cylinder liner and the cylinder body in the prior art, resulting in poor heat dissipation of the cylinder liner. To this end, the present invention provides a burr-shaped cast-in cylinder liner, the cylinder liner is made of cast iron, cast into the cylinder body by die casting or gravity casting, and a plurality of burrs are formed on the outer peripheral surface of the cylinder liner; at least one of the burrs meets:

[0005] The diameter of the burr at a position 0.25 mm from the top is L1, and the diameter of the burr at a position 0.4 mm from the top is L2; ​​the ratio range of the diameter L1 to the diameter L2 is: 0.65≤L1:L2≤1.15;

[0006] The burr comprises a protrusion in a necked shape, and the protrusion is in a necked structure at a position between 0.2 mm and 0.35 mm from the top of the burr; or, the burr comprises a conical protrusion.

[0007] In the above structure, optionally, the protrusion in the shape of a neck is a dumbbell-shaped burr;

[0008] At the diameter L1 position of the dumbbell-shaped burr, the outer contour of the dumbbell-shaped burr has points A1 and A3, and the line connecting points A1 and A3 is the diameter L1; the outer contour tip of the dumbbell-shaped protruding position of the dumbbell-shaped burr also has point A2; point A2 and point A1 are located on the same longitudinal section of the dumbbell-shaped burr, the line connecting points A1 and A2 is line A1A2, the line connecting points A1 and A3 is line A1A3, and the angle between the extension line of line A1A3 and line A1A2 is α2;

[0009] At the diameter L2 position of the dumbbell-shaped burr, the outer contour of the dumbbell-shaped burr has points A4 and A5, and the line connecting points A4 and A5 is the diameter L2; points A4 and A1 are located on the same longitudinal section of the dumbbell-shaped burr, the line connecting points A4 and A1 is line A4A1, the line connecting points A4 and A5 is line A4A5, and the angle between line A4A1 and line A4A5 is α1;

[0010] The ratio range of α1 and α2 is: α1:α2≥0.5.

[0011] In the above structure, optionally, the ratio range of α1 and α2 is: α1:α2≤2.1.

[0012] In the above structure, optionally, the number of the dumbbell-shaped burrs on the cylinder sleeve within 1 square centimeter is 30 to 80.

[0013] In the above structure, optionally, the number of the dumbbell-shaped burrs passing through any 10 mm long line segment on the outer circumferential surface of the cylinder liner is 4 to 8.

[0014] In the above structure, optionally, the pointed cone-shaped protrusion is a conical burr;

[0015] At the diameter L1 position of the conical burr, the outer contour of the conical burr has points A1 and A3, and the line connecting points A1 and A3 is the diameter L1; there is also a point A2 on the outer contour of the conical burr, and point A2 is located 0.1 mm away from the top of the burr; point A2 and point A1 are located on the same longitudinal section of the conical burr, the line connecting points A1 and A2 is line A1A2, the line connecting points A1 and A3 is line A1A3, and the angle between line A1A3 and line A1A2 is α2;

[0016] At the diameter L2 position of the conical burr, the outer contour of the conical burr has points A4 and A5, and the line connecting points A4 and A5 is the diameter L2; points A4 and A1 are located on the same longitudinal section of the conical burr, the line connecting points A4 and A1 is line A4A1, the line connecting points A4 and A5 is line A4A5, and the angle between line A4A1 and line A4A5 is α1;

[0017] The ratio range of α1 and α2 is: α1:α2≥0.25.

[0018] In the above structure, optionally, the ratio range of α1 and α2 is: α1:α2≤1.0.

[0019] In the above structure, optionally, the number of the conical burrs on the cylinder liner within 1 square centimeter is 45 to 85.

[0020] In the above structure, optionally, the number of any 10 mm long line segment passing through the conical burrs on the outer circumferential surface of the cylinder liner is 6 to 11.

[0021] A burr detection method for a burr-shaped cast-in cylinder liner, comprising:

[0022] The method for detecting the diameter of the burr at a position of 0.25 mm and 0.4 mm from the top of the burr comprises the following steps:

[0023] Step S101, taking the end position of the cylinder liner or the vertical cutting surface in the radial direction of the cylinder liner as the detection surface;

[0024] Step S102, placing the inspection surface of the cylinder liner under the objective lens of an ultra-depth-of-field microscope;

[0025] Step S103, turning the coarse focusing knob and the fine focusing knob until a clear image of the object is seen on the computer screen;

[0026] Step S104, using the object image of step S103, find the position of the burr 0.25mm and 0.4mm from the top of the burr downward and along the vertical direction respectively; wherein the burr distance to the top position is the highest point of the longitudinal section of the burr, and the allowable error of the distance from the burr to the top is: ±0.018mm;

[0027] Step S105, detecting the intercept L1 value of the burr at 0.25mm from the top and the intercept L2 value of the burr at 0.4mm from the top in step S104; wherein the diameters of the burr at 0.25mm and 0.4mm from the top are the horizontal lengths of the longitudinal section of the burr.

[0028] The above-mentioned burr detection method can be optionally applied to the above-mentioned burr-shaped cast-in cylinder liner.

[0029] The burr detection method mentioned above, optionally, is applied to a burr-shaped cast-in cylinder liner, and the angle α1 and the angle α2 of the dumbbell-shaped burr are detected;

[0030] The detection method of the angle α1 and the angle α2 of the dumbbell-shaped burr is:

[0031] Step S201, according to the steps S101 to S104, respectively finding the positions of the dumbbell-shaped burr 0.25 mm and 0.4 mm from the top;

[0032] Step S202, at a position of 0.25 mm from the top of the burr in step S201, select point A1 and point A3 of the outer contour of the dumbbell-shaped burr; select point A2, the tip of the outer contour of the dumbbell-shaped protrusion of the dumbbell-shaped burr; wherein point A2 is the outermost position of the dumbbell-shaped protrusion of the longitudinal section of the burr in step S103 and the ultra-depth of field microscope photograph, and the outermost position of the dumbbell-shaped protrusion is allowed to have an error of ±±0.018 mm; measure the angle α2 between the extension line of the line A1A3 and the line A1A2 through the angle measurement function of the software of the ultra-depth of field microscope;

[0033] At the position of 0.4 mm from the top of the burr in step S201, select points A4 and A5 of the outer contour of the dumbbell-shaped burr; and measure the angle α1 between the line A4A1 and the line A4A5 using the angle measurement function of the software of the ultra-depth of field microscope.

[0034] The burr detection method mentioned above, optionally, is applied to the burr-shaped cast-in cylinder liner, and the angle α1 and the angle α2 of the conical burr are detected;

[0035] The detection method of the angle α1 and the angle α2 of the conical burr is:

[0036] Step S301, according to the steps S101 to S104, respectively finding the positions of the conical burr 0.25 mm and 0.4 mm from the top;

[0037] Step S302, at the position of 0.25mm from the top of the burr in step S301, select point A1 and point A3 of the outer contour of the conical burr; through the ultra-depth microscope photo of step S103, find the position of 0.1mm from the top of the burr downward in the vertical direction; at the position of 0.1mm from the top of the burr, select point A2 on the outer contour of the longitudinal section of the burr in the ultra-depth microscope photo; measure the angle α2 between the extension line of the connecting line A1A3 and the connecting line A1A2 through the angle measurement function of the ultra-depth microscope software;

[0038] At the position of 0.4 mm from the top of the burr in step S301, select points A4 and A5 of the outer contour of the conical burr; and measure the angle α1 between the line A4A1 and the line A4A5 using the angle measurement function of the software of the ultra-depth of field microscope.

[0039] In this embodiment, the binding rate measurement method is specifically performed in the following steps:

[0040] Step S1, die-casting the cylinder liner in the cylinder body, controlling the aluminum molten temperature in the range of 700°C to 720°C, and the pouring temperature in the range of 650°C to 680°C; controlling the cylinder liner preheating temperature to 130-150°C, using a 28000KN die-casting machine, setting the slow pressure injection speed to 0.2m / s, and the fast pressure injection speed to 5.5m / s; setting the final pressure to maintain 45MPa;

[0041] Step S2, cutting the die-cast cylinder body at a position 25-35 mm from the top of the cylinder liner, and cutting the die-cast cylinder body at a position 25-35 mm from the rear end of the cylinder liner;

[0042] Afterwards, the annular end surfaces of the top end and the tail end of the cylinder liner are polished with sandpaper, respectively with 180 mesh, 400 mesh, and 800 mesh water sandpaper, and the end surfaces are polished on a polishing machine as needed;

[0043] Step S3, for the top and tail ends of the polished cylinder liner, detect the bonding rate between the aluminum cylinder body and the outer diameter of the cylinder liner. The specific detection positions are: Figure 6 As shown, there are four sections of cylinder liner outer diameter positions A with a circumference of 10 mm at 90 degree intervals; the specific detection method is:

[0044] Step S301, using an ultra-depth-of-field microscope, measuring the length of the porosity within a circumference of 10000 μm along the burr surface; wherein, if there is a gap between the aluminum cylinder block and the cast iron of the cylinder liner by visual observation under the microscope, it means that there is a pore at this position; and the length of the gap is the length of the pore;

[0045] Step S302, the bonding ratio between the aluminum cylinder block and the outer diameter of the cylinder sleeve is calculated by the bonding ratio calculation formula, bonding ratio = (100 - (∑ porosity length 2 / 100000000))%; wherein the length unit of the porosity is μm.

[0046] The technical solution of the present invention has the following advantages:

[0047] 1. The burr-shaped cast-in cylinder liner provided by the present invention has a plurality of burrs formed on the outer peripheral surface of the cylinder liner. The diameter of the burr at a position 0.25 mm from the top is defined as L1, and the diameter of the burr at a position 0.4 mm from the top is defined as L2. The ratio range of the diameter L1 to the diameter L2 is defined as: 0.65≤L1:L2≤1.15.

[0048] The position of the necked protrusion in the range of 0.2mm to 0.35mm from the top of the burr is a necked structure. Therefore, the position of 0.25mm from the top of the burr is within the necking range of the dumbbell-shaped burr. In addition, the position of 0.4mm from the top of the burr is the position of the burr close to the outer peripheral surface of the cylinder liner, which will affect the bonding strength between the burr and the cylinder liner and the shape characteristics of the burr. In the present invention, the ratio range of the diameter L1 and the diameter L2 is limited to: 0.65≤L1:L2≤1.15. Within the above ratio range, the dumbbell-shaped burr is a protrusion in the shape of a neck, and the conical burr is a conical protrusion. Among the above two types of burrs, the bonding rate between a single burr and the cylinder body is higher, thereby improving the bonding rate between the cylinder liner and the cylinder body, thereby ensuring the heat transfer capacity of the overall structure of the cylinder liner and the cylinder body, and ensuring that the cylinder liner has excellent heat dissipation capacity.

[0049] 2. The burr-shaped cast-in cylinder liner provided by the present invention has a dumbbell-shaped burr at a diameter L1 position, and the outer contour of the dumbbell-shaped burr has points A1 and A3, and the line connecting points A1 and A3 is the diameter L1; the outer contour tip of the dumbbell-shaped protruding position of the dumbbell-shaped burr also has a point A2; point A2 and point A1 are located on the same longitudinal section of the dumbbell-shaped burr, the line connecting points A1 and A2 is line A1A2, the line connecting points A1 and A3 is line A1A3, and the angle between the extension of line A1A3 and line A1A2 is α2;

[0050] At the position of the diameter L2 of the dumbbell-shaped burr, the outer contour of the dumbbell-shaped burr has points A4 and A5, and the line connecting the points A4 and A5 is the diameter L2; the points A4 and A1 are located on the same longitudinal section of the dumbbell-shaped burr, the line connecting the points A4 and A1 is the line A4A1, the line connecting the points A4 and A5 is the line A4A5, and the angle between the lines A4A1 and A4A5 is α1;

[0051] The ratio range of the above α1 and α2 is: α1:α2≥0.5.

[0052] Among them, the above-mentioned point A2 and point A1 are located on the same cutting plane of the super-depth-of-field microscope image, which can effectively ensure that the above-mentioned point A2 and point A1 are located on the same vertical plane of the dumbbell-shaped burr. The above-mentioned point A4 and point A1 are located on the same cutting plane of the super-depth-of-field microscope image, which can effectively ensure that the above-mentioned point A4 and point A1 are located on the same vertical plane of the dumbbell-shaped burr.

[0053] Under the above conditions, the smaller the value of α1 is, the closer the dumbbell-shaped burr is to the outer peripheral surface of the cylinder liner, that is, the lower and middle parts of the dumbbell-shaped burr are closer to being flat. When the lower and middle parts of the dumbbell-shaped burr are closer to being flat, the connection surface between the dumbbell-shaped burr and the outer peripheral surface of the cylinder liner increases, and the dumbbell-shaped burr is firmly connected to the outer peripheral surface of the cylinder liner and is not easy to break. Of course, if the value of α1 is too large, the bottom of the dumbbell-shaped burr on the cylinder liner will be a large inverted cone, and paint and other debris will easily remain at the neck and root of the burr when the paint is shot blasted, resulting in inclusions and pores on the joint surface between the root of the burr and the aluminum cylinder body during die casting, which will cause the problem of reduced bonding between the cylinder liner and the cylinder body.

[0054] Under the above conditions, α2 defines the structure of the necking position of the dumbbell-shaped burr. When α2 is in an appropriate range, the bonding rate between a single burr and the cylinder body is high, and the bonding rate between the cylinder liner and the cylinder body is high, thereby ensuring that the overall structure of the cylinder liner has excellent heat dissipation capacity.

[0055] In addition, the present invention also defines the ratio range of α1 and α2 in the dumbbell-shaped burr as: α1:α2≥0.5. When the above α1 and α2 are within the above ratio range, the bonding rate between each burr and the cylinder body is high, and the bonding rate between the cylinder liner and the cylinder body is high, thereby ensuring that the cylinder liner has excellent heat dissipation capacity.

[0056] 3. The burr-shaped cast-in cylinder liner provided by the present invention also defines the ratio range of α1 and α2 in the dumbbell-shaped burr as: 0.5≤α1:α2≤2.1. When the above α1 and α2 are within the above ratio range, it can effectively ensure that the bonding rate between each burr and the cylinder body is high, so as to ensure that the overall structure of the cylinder liner has excellent heat dissipation capacity.

[0057] 4. The burr-shaped cast-in cylinder liner provided by the present invention has a number of dumbbell-shaped burrs ranging from 30 to 80 within 1 square centimeter on the cylinder liner.

[0058] In the present invention, the number of dumbbell-shaped burrs within 1 square centimeter is 30 to 80. More preferably, it is 30 to 55. The appropriate number of dumbbell-shaped burrs can ensure the bonding rate between the outer surface of the cylinder liner and the cylinder body. The improvement of the bonding rate can effectively ensure the heat dissipation capacity of the overall structure of the cylinder liner, and at the same time improve the bonding strength between the overall structure of the cylinder liner and the cylinder body.

[0059] 5. The burr-shaped cast-in cylinder liner provided by the present invention has a surface in which the dumbbell-shaped burrs are located on any 10 mm long line segment on the outer circumference of the cylinder liner, and the number of the dumbbell-shaped burrs passing through the dumbbell-shaped burrs is 4 to 8.

[0060] By limiting the number of dumbbell-shaped burrs passing through any 10mm long line segment on the outer peripheral surface of the cylinder liner, the burr density of the dumbbell-shaped burrs on the outer peripheral surface of the cylinder liner can be effectively limited. The appropriate dumbbell-shaped burr density can ensure the bonding rate between the outer surface of the cylinder liner and the cylinder body. The improvement of the bonding rate can effectively ensure the heat dissipation capacity of the overall structure of the cylinder liner, and at the same time improve the bonding strength between the overall structure of the cylinder liner and the cylinder body.

[0061] 6. The burr-shaped cast-in cylinder liner provided by the present invention has a point A1 and a point A3 at the diameter L1 position of the conical burr and the outer contour of the conical burr, and the point A1 and the point A3 are located 0.25 mm away from the top of the burr, and the line connecting the point A1 and the point A3 is the diameter L1; the outer contour of the conical burr also has a point A2, and the point A2 is located 0.1 mm away from the top of the burr; the point A2 and the point A1 are located on the same longitudinal section of the dumbbell-shaped burr, the line connecting the point A1 and the point A2 is the line A1A2, the line connecting the point A1 and the point A3 is the line A1A3, and the angle between the line A1A3 and the line A1A2 is α2;

[0062] At the diameter L2 position of the conical burr, the outer contour of the conical burr has points A4 and A5, and points A4 and A5 are located 0.4 mm away from the top of the burr, and the line connecting points A4 and A5 is the diameter L2; points A4 and A1 are located on the same longitudinal section of the conical burr, and the line connecting points A4 and A1 is line A4A1, and the line connecting points A4 and A5 is line A4A5, and the angle between line A4A1 and line A4A5 is α1;

[0063] The ratio range of α1 and α2 is: α1:α2≥0.25.

[0064] Among them, the above-mentioned point A2 and point A1 are on the same cutting plane of the ultra-depth microscope image, which can effectively ensure that the above-mentioned point A2 and point A1 are on the same vertical plane of the conical burr. The above-mentioned point A4 and point A1 are on the same cutting plane of the ultra-depth microscope image, which can effectively ensure that the above-mentioned point A4 and point A1 are on the same vertical plane of the conical burr.

[0065] The point A2 is selected as 0.1 mm from the top of the burr because the line A1A2 is closer to the shape of the conical burr. Moreover, the point A2 is 0.1 mm from the top of the burr and far away from the flat position of the top of the burr, so it is not easily affected by the sudden flattening of the top of the conical burr.

[0066] Under the above conditions, the larger the value of α1, the closer the conical burr is to the outer peripheral surface of the cylinder liner, that is, the lower and middle parts of the conical burr are close to being flat. When the lower and middle parts of the conical burr are close to being flat, the connection surface between the conical burr and the outer peripheral surface of the cylinder liner increases, and the conical burr is firmly connected to the outer peripheral surface of the cylinder liner and is not easy to break. Of course, if the value of α1 is too large, the conical burr on the cylinder liner will present a larger inverted cone shape, and the paint at the root of the burr should not be removed during shot blasting. During die casting, the root of the burr is prone to defects such as inclusions and pores, resulting in a decrease in the bonding rate.

[0067] Under the above conditions, α2 defines the structure of the necking position of the conical burr. When α2 is in an appropriate range, the bonding rate between the single burr and the cylinder body is high, and the bonding rate between the cylinder body and the outer surface of the cylinder liner is also high, thereby ensuring that the overall structure of the cylinder liner has excellent heat dissipation capacity.

[0068] In addition, the present invention also defines the ratio range of α1 and α2 as: α1:α2≥0.25. When α1 and α2 are within the above ratio range, the bonding rate between the cylinder liner and the cylinder body is high, thereby ensuring that the overall structure of the cylinder liner has excellent heat dissipation capacity.

[0069] 7. The burr-shaped cast-in cylinder liner provided by the present invention also defines the ratio range of α1 and α2 in the conical burr as: 0.25≤α1:α2≤1.0. When the above α1 and α2 are within the above ratio range, it can effectively ensure that the bonding rate between each burr and the cylinder body is high, so as to ensure that the overall structure of the cylinder liner has excellent heat dissipation capacity.

[0070] 8. The burr-shaped cast-in cylinder liner provided by the present invention has a number of conical burrs ranging from 45 to 85 within 1 square centimeter on the cylinder liner.

[0071] In the present invention, the number of conical burrs within 1 square centimeter is 45 to 85. The appropriate number of conical burrs can ensure the bonding rate between the outer surface of the cylinder liner and the cylinder body. The improvement of the bonding rate can effectively ensure the heat dissipation capacity of the overall structure of the cylinder liner, and at the same time improve the bonding strength between the overall structure of the cylinder liner and the cylinder body.

[0072] 9. The burr-shaped cast-in cylinder liner provided by the present invention has 6 to 11 conical burrs passing through any 10 mm long line segment on the outer circumferential surface of the cylinder liner.

[0073] By limiting the number of conical burrs passing through any 10mm long line segment on the outer circumference of the cylinder liner, the number and density of conical burrs on the outer circumference of the cylinder liner can be effectively limited. Under the above parameters, the appropriate density of conical burrs can ensure the bonding rate between the outer surface of the cylinder liner and the cylinder body. The improvement of the bonding rate can effectively ensure the heat dissipation capacity of the overall structure of the cylinder liner, while improving the bonding strength between the overall structure of the cylinder liner and the cylinder body.

[0074] 10. The burr detection method of the burr-shaped cast-in cylinder liner provided by the present invention comprises: a method for detecting the diameter value of the burr at the position of 0.25mm and 0.4mm from the top of the burr. Specifically, it comprises the following steps:

[0075] Step S101, the end position of the cylinder liner, or the vertical cutting surface of the cylinder liner in the radial direction is used as the detection surface. In this step, the end position of the cylinder liner, or the radial cutting surface of the cylinder liner is used as the detection surface, so that the detection surface can be found simply and easily. In addition, in the present invention, the specific radial cutting surface position of the cylinder liner is not limited.

[0076] Step S102, placing the inspection surface of the cylinder liner under the objective lens of the ultra-depth-of-field microscope; Step S103, turning the coarse focusing screw and the fine focusing screw until a clear image is seen on the computer screen; in this step, the ultra-depth-of-field microscope is focused on the image of the inspection surface. In addition, in the selection of specific burrs to be inspected, burrs with relatively complete longitudinal sections cut out are selected. Relatively complete refers to the longitudinal section of the burr formed by cutting along the longitudinal section from a position close to the top of the burr.

[0077] Step S104, through the object image of step S103, find the position of the burr 0.25mm and 0.4mm away from the top of the burr downward and along the vertical direction respectively; wherein, the position of the burr from the top is selected as the highest point of the longitudinal section of the burr, and the allowable error of the distance from the burr to the top is: ±0.018mm. In the above steps, find the position of the burr 0.25mm and 0.4mm away from the top of the burr selected in the object image of step S103. The specific method is to use the vertical marking function of the super depth of field microscope equipment to find the position of the burr 0.25mm and 0.4mm away from the top. In this step, the position of the burr from the top is selected as the highest point of the longitudinal section of the burr, and the allowable error of the distance from the burr to the top is: ±0.018mm. Thereby reducing the influence of human factors.

[0078] Step S105, detecting the intercept L1 value of the burr at the position of 0.25mm from the top and the intercept L2 value of the burr at the position of 0.4mm from the top in step S104; wherein the diameter of the burr at the position of 0.25mm and 0.4mm from the top is the horizontal length of the longitudinal section of the burr. In this step, the horizontal length values ​​of the above 0.25mm position and 0.4mm position are measured respectively by using the horizontal scribing function of the ultra-depth of field microscope equipment.

[0079] 11. The burr detection method of the burr-shaped cast-in cylinder liner provided by the present invention, the detection method of the angle α1 and the angle α2 of the dumbbell-shaped burr is:

[0080] Step S201, according to the steps S101 to S104, respectively find the position of the dumbbell-shaped burr 0.25mm and 0.4mm from the top. In this step, the same measurement method as the steps S101 to S104 is adopted to find the position of the dumbbell-shaped burr 0.25mm and 0.4mm from the top.

[0081] Step S202, at the position of 0.25mm from the top of the burr in step S201, select the A1 point and the A3 point of the outer contour of the dumbbell-shaped burr; select the tip A2 point of the outer contour of the dumbbell-shaped protrusion of the dumbbell-shaped burr; wherein the A2 point is the outermost position of the dumbbell-shaped protrusion of the longitudinal section of the burr in the super-depth microscope photo in step S103; and measure the angle α2 between the extension line of the line A1A3 and the line A1A2 through the software angle measurement function of the super-depth microscope. In this step, the position of the A1 point and the A3 point of the outer contour of the dumbbell-shaped burr are selected based on the position of 0.25mm from the top of the burr found in step S201, and then the horizontal marking function of the super-depth microscope device is used, and the points that are marked through the above-mentioned 0.25mm position and intersect with the outer contour of the dumbbell-shaped burr are the above-mentioned A1 point and A3 point.

[0082] In addition, corresponding to the selection of point A2 in this step, the outermost position of the dumbbell-shaped protrusion of the longitudinal section of the burr in the ultra-depth of field microscope photo is selected, and the allowable error of the above position selection is: ±0.018mm, so as to reduce the influence of human factors.

[0083] 12. The burr detection method of the burr-shaped cast-in cylinder liner provided by the present invention, the detection method of the angle α1 and the angle α2 of the conical burr is:

[0084] Step S301, according to the steps S101 to S104, respectively find the positions of the conical burr 0.25mm and 0.4mm from the top. In this step, the same measurement method as the steps S101 to S104 is adopted to find the positions of the conical burr 0.25mm and 0.4mm from the top.

[0085] Step S302, at the position of 0.25mm from the top of the burr in step S301, select point A1 and point A3 of the outer contour of the conical burr; through the ultra-depth microscope photo of step S103, find the position of 0.1mm from the top of the burr downward in the vertical direction; at the position of 0.1mm from the top of the burr, select point A2 on the outer contour of the longitudinal section of the burr in the ultra-depth microscope photo; through the angle measurement function of the ultra-depth microscope software, measure the angle α2 between the extension line of the connecting line A1A3 and the connecting line A1A2. In this step, the position of point A1 and point A3 of the outer contour of the conical burr is selected based on the position of 0.25mm from the top of the burr found in step S301, and then the horizontal marking function of the ultra-depth microscope equipment is used, and the points marked through the above-mentioned 0.25mm position and intersecting with the outer contour of the conical burr are the above-mentioned points A1 and A3.

[0086] In addition, the position of point A2 of the outer contour of the conical burr is selected based on the position of the burr 0.1 mm from the top found in step S301, and then the horizontal marking function of the super-depth of field microscope equipment is used. The point that passes through the above-mentioned 0.1 mm position, is close to the above-mentioned point A1 and intersects with the outer contour of the conical burr is the above-mentioned point A2. BRIEF DESCRIPTION OF THE DRAWINGS

[0087] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0088] Figure 1 A schematic diagram of the specific parameter positions of the longitudinal section of the dumbbell-shaped burr provided by the present invention;

[0089] Figure 2 A schematic diagram of the positions of the diameter L1 and the diameter L2 on the longitudinal section of the conical burr provided by the present invention;

[0090] Figure 3 A schematic diagram of the specific parameter positions of the longitudinal section of the conical burr provided by the present invention;

[0091] Figure 4A longitudinal cross-sectional view of a cylinder sleeve provided by the present invention;

[0092] Figure 5 A schematic diagram of the position of the detection surface of the cylinder liner end position provided by the present invention;

[0093] Figure 6 A schematic diagram of the position of the cylinder liner outer diameter position A for detecting the bonding rate at the cylinder liner end provided by the present invention.

[0094] Description of reference numerals:

[0095] 1 - cylinder liner; 2 - outer peripheral surface; 3 - dumbbell-shaped burr; 4 - cone-shaped burr; 5 - detection surface. DETAILED DESCRIPTION

[0096] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0097] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0098] Example 1

[0099] See also Figure 1 and Figure 4 , Figure 1 A schematic diagram showing the specific parameter positions of the longitudinal section of the dumbbell-shaped burr in an embodiment of the present invention is shown; Figure 4 It is a longitudinal cross-sectional view of a cylinder liner in an embodiment of the present invention.

[0100] A burr-shaped cast-in cylinder liner, such as Figure 5 As shown, the cylinder liner 1 is made of cast iron and cast into the cylinder block by a die-casting process, and a plurality of burrs are formed on the outer peripheral surface 2 of the cylinder liner 1. At least one of the burrs satisfies:

[0101] The burr comprises a protrusion in the shape of a neck, and the protrusion is a neck structure at a distance of 0.2 mm to 0.35 mm from the top of the burr. Figure 1As shown, the protrusion with the above-mentioned necking structure is a dumbbell-shaped burr 3.

[0102] The diameter of the dumbbell-shaped burr 3 in this embodiment at a position 0.25 mm from the top is L1, and the diameter of the burr at a position 0.4 mm from the top is L2; ​​the ratio range of the diameter L1 to the diameter L2 is: 0.65≤L1:L2≤1.15. Within the above ratio range, the bonding rate between a single burr and the cylinder body is high, ensuring the bonding strength between the burr and the cylinder body.

[0103] For specific experimental data, please refer to the following table:

[0104]

[0105]

[0106] It can be seen from the above table that in the preferred embodiment of the present invention, when the ratio of diameter L1 to diameter L2 is in the range of 0.65≤L1:L2≤1, the bonding rate between the burr and the cylinder body is significantly higher than when the ratio of diameter L1 to diameter L2 is in the range of L1:L2 less than 0.65 or greater than 1.15. Among them, the tools related to obtaining the above data are as follows: The cutting tool used for cutting the cylinder sleeve 1 in the radial direction is a metal circular saw machine, model: Dongguan Jincheng Machinery Co., Ltd., JC-130-NC. The tool model of the super depth of field microscope is: Japan Keyence, VHX-2000.

[0107] Furthermore, in this embodiment, in order to further improve the bonding strength between the cylinder liner 1 and the cylinder body, at the same time, it is ensured that the dumbbell-shaped burr 3 is firmly connected to the outer peripheral surface 2 of the cylinder liner 1 and is not prone to breakage. Figure 1 As shown:

[0108] At the diameter L1 position of the dumbbell-shaped burr 3, the outer contour of the dumbbell-shaped burr 3 has points A1 and A3, and the line connecting points A1 and A3 is the diameter L1; the outer contour tip of the dumbbell-shaped protruding position of the dumbbell-shaped burr 3 also has a point A2; points A2 and A1 are located on the same longitudinal section of the dumbbell-shaped burr 3, the line connecting points A1 and A2 is line A1A2, the line connecting points A1 and A3 is line A1A3, and the angle between the extension line of line A1A3 and line A1A2 is α2; the above-mentioned α2 defines the structure of the necking position of the dumbbell-shaped burr 3.

[0109] At the diameter L2 position of the dumbbell-shaped burr 3, the outer contour of the dumbbell-shaped burr 3 has points A4 and A5, and the line connecting points A4 and A5 is the diameter L2; points A4 and A1 are located on the same longitudinal section of the dumbbell-shaped burr 3, and the line connecting points A4 and A1 is line A4A1, and the line connecting points A4 and A5 is line A4A5, and the angle between lines A4A1 and A4A5 is α1. The larger the value of the above α1, the closer the dumbbell-shaped burr 3 is to the outer peripheral surface 2 of the cylinder liner 1, that is, the more the middle and lower parts of the dumbbell-shaped burr 3 are to a flat surface. When the middle and lower parts of the dumbbell-shaped burr 3 are to a flat surface, the connection surface between the dumbbell-shaped burr 3 and the outer peripheral surface 2 of the cylinder liner 1 increases, and the dumbbell-shaped burr 3 is firmly connected to the outer peripheral surface 2 of the cylinder liner 1 and is not easy to break.

[0110] The ratio range of α1 and α2 is: 2.1≥α1:α2≥0.5. When the above α1 and α2 are within the above ratio range, the bonding rate between the single burr and the cylinder body is high, the bonding strength between the cylinder liner 1 and the cylinder body is excellent, and the dumbbell-shaped burr 3 is firmly connected to the outer peripheral surface 2 of the cylinder liner 1.

[0111] For specific experimental data, please refer to the following table:

[0112] α1:α2 ratio Binding rate Example 1 α1:α2＝0.5 98.1％ Example 2 α1:α2＝2.1 98.5％ Example 3 α1:α2＝0.62 99.2％ Example 4 α1:α2＝1.37 99.5％ Comparative Example 1 α1:α2＝0.45 97.1％ Comparative Example 2 α1:α2＝2.14 97.3％

[0113] It can be seen from the above table that in the preferred embodiment of the present invention, when the ratio of the angle α1 to the angle α2 is in the range of 2.1≥α1:α2≥0.5, the bonding rate between the burr and the cylinder body is significantly higher than when the ratio of the angle α1 to the angle α2 is in the range of α1:α2 is less than 0.5 or greater than 2.1. Among them, the tools related to obtaining the above data are as follows: The cutting tool used for cutting the radial direction of the cylinder sleeve 1 is a metal circular saw machine, model: Dongguan Jincheng Machinery Co., Ltd., JC-130-NC. The tool model of the super depth of field microscope is: Japan Keyence, VHX-2000.

[0114] In this embodiment, the appropriate number of dumbbell-shaped burrs 3 can ensure the bonding rate between the multiple burrs on the cylinder liner 1 and the cylinder body, and improve the bonding strength. On the cylinder liner 1, the number of the dumbbell-shaped burrs 3 within 1 square centimeter is: 30 to 80.

[0115] In this embodiment, the burr density of the appropriate dumbbell-shaped burr 3 can ensure the bonding rate between the multiple burrs on the cylinder liner 1 and the cylinder body, and improve the bonding strength. The surface is that the dumbbell-shaped burr 3 on the outer peripheral surface 2 of the cylinder liner 1 has any 10 mm long line segment, and the number of dumbbell-shaped burrs 3 passing through is 4 to 8.

[0116] The method for detecting dumbbell-shaped burrs of burr-shaped cast-in cylinder liners includes:

[0117] The method for detecting the diameter of the burr at a position of 0.25 mm and 0.4 mm from the top of the burr comprises the following steps:

[0118] Step S101, taking the end position of the cylinder liner 1, or the vertical cutting surface of the cylinder liner 1 in the radial direction as the detection surface 5;

[0119] Step S102, placing the detection surface 5 of the cylinder liner 1 under the objective lens of the ultra-depth-of-field microscope;

[0120] Step S103, turning the coarse focusing knob and the fine focusing knob until a clear image of the object is seen on the computer screen;

[0121] Step S104, using the object image of step S103, find the position of the burr 0.25mm and 0.4mm from the top of the burr downward and along the vertical direction respectively; wherein the burr distance to the top position is the highest point of the longitudinal section of the burr, and the allowable error of the distance from the burr to the top is: ±0.018mm;

[0122] Step S105, detecting the intercept L1 value of the burr at 0.25mm from the top and the intercept L2 value of the burr at 0.4mm from the top in step S104; wherein the diameters of the burr at 0.25mm and 0.4mm from the top are the horizontal lengths of the longitudinal section of the burr.

[0123] In addition, the detection method of the angle α1 and the angle α2 of the dumbbell-shaped burr 3 is:

[0124] Step S201, according to the steps S101 to S104, respectively finding the positions of the dumbbell-shaped burr 3 at 0.25 mm and 0.4 mm from the top;

[0125] Step S202, at a position of 0.25 mm from the top of the burr in step S201, select point A1 and point A3 of the outer contour of the dumbbell-shaped burr 3; select point A2, the tip of the outer contour of the dumbbell-shaped protrusion of the dumbbell-shaped burr 3; wherein point A2 is the outermost position of the dumbbell-shaped protrusion of the longitudinal section of the burr in step S103 and the ultra-depth of field microscope photograph, and the outermost position of the dumbbell-shaped protrusion is allowed to have an error of ±0.018 mm; measure the angle α2 between the extension line of the line A1A3 and the line A1A2 through the angle measurement function of the software of the ultra-depth of field microscope;

[0126] At the position of 0.4 mm from the top of the burr in step S201, select points A4 and A5 of the outer contour of the dumbbell-shaped burr 3; and measure the angle α1 between the line A4A1 and the line A4A5 using the angle measurement function of the software of the ultra-depth of field microscope.

[0127] In this embodiment, the binding rate measurement method is specifically performed in the following steps:

[0128] Step S1, die-casting the cylinder liner in the cylinder body, controlling the aluminum molten temperature in the range of 700°C to 720°C, and the pouring temperature in the range of 650°C to 680°C; controlling the cylinder liner preheating temperature to 130-150°C, using a 28000KN die-casting machine, setting the slow pressure injection speed to 0.2m / s, and the fast pressure injection speed to 5.5m / s; setting the final pressure to maintain 45MPa;

[0129] Step S2, cutting the die-cast cylinder body at a position 25-35 mm from the top of the cylinder liner, and cutting the die-cast cylinder body at a position 25-35 mm from the rear end of the cylinder liner;

[0130] Afterwards, the annular end surfaces of the top end and the tail end of the cylinder liner are polished with sandpaper, respectively with 180 mesh, 400 mesh, and 800 mesh water sandpaper, and the end surfaces are polished on a polishing machine as needed;

[0131] Step S3, for the top and tail ends of the polished cylinder liner, detect the bonding rate between the aluminum cylinder body and the outer diameter of the cylinder liner. The specific detection positions are: Figure 6 As shown, there are four sections of cylinder liner outer diameter positions A with a circumference of 10 mm at 90 degree intervals; the specific detection method is:

[0132] Step S301, using an ultra-depth-of-field microscope, measuring the length of the porosity within a circumference of 10000 μm along the burr surface; wherein, if there is a gap between the aluminum cylinder block and the cast iron of the cylinder liner 1 by visual observation under the microscope, it means that there is a pore at this position; the length of the gap is the length of the pore;

[0133] Step S302, the bonding ratio between the aluminum cylinder block and the outer diameter of the cylinder sleeve is calculated by the bonding ratio calculation formula, bonding ratio = (100 - (∑ pore length 2 / 100000000))%; wherein the unit of length of the pore is μm.

[0134] Of course, in this embodiment, the number of dumbbell-shaped burrs 3 on the cylinder liner 1 is not specifically limited. In other embodiments, the number of dumbbell-shaped burrs 3 on the cylinder liner 1 within 1 square centimeter can also be less than 30, or greater than 80.

[0135] Of course, in this embodiment, the ratio range of α1 and α2 is not specifically limited. In other embodiments, the ratio range of α1 and α2 may also be: α1:α2≤0.5; or, the ratio range of α1 and α2 may also be: α1:α2≥2.1.

[0136] Of course, in the present embodiment, there is no specific limitation on the number of any 10 mm long line segments on the outer peripheral surface 2 of the cylinder liner 1 that pass through the dumbbell-shaped burrs 3. In other embodiments, the number of any 10 mm long line segments on the outer peripheral surface 2 of the cylinder liner 1 that pass through the dumbbell-shaped burrs 3 can be less than 4 or greater than 8.

[0137] Of course, in this embodiment, the specific method of casting the cylinder liner 1 into the cylinder body is not specifically limited. In other embodiments, the cylinder liner 1 is made of cast iron and cast into the cylinder body by a gravity casting process.

[0138] Example 2

[0139] See also Figure 2 and Figure 4 , Figure 2 A schematic diagram showing the positions of the diameter L1 and the diameter L2 on the longitudinal section of the conical burr in an embodiment of the present invention is shown; Figure 4 It is a longitudinal cross-sectional view of a cylinder liner in an embodiment of the present invention.

[0140] A burr-shaped cast-in cylinder liner, such as Figure 5 As shown, the cylinder liner 1 is made of cast iron and cast into the cylinder block by a die-casting process, and a plurality of burrs are formed on the outer peripheral surface 2 of the cylinder liner 1. At least one of the burrs satisfies:

[0141] The burr comprises a pointed cone-shaped protrusion. The pointed cone-shaped protrusion is a conical burr 4;

[0142] The diameter of the burr at a position 0.25 mm from the top is L1, and the diameter of the burr at a position 0.4 mm from the top is L2; ​​the ratio range of the diameter L1 to the diameter L2 is: 0.65≤L1:L2≤1.15; within the above ratio range, the bonding rate between a single burr and the cylinder body is high, ensuring the bonding strength between the burr and the cylinder body.

[0143] Furthermore, in this embodiment, in order to further improve the bonding strength between the cylinder liner 1 and the cylinder body, it is also ensured that the conical burr 4 is firmly connected to the outer peripheral surface 2 of the cylinder liner 1 and is not prone to breakage. Figure 3 The schematic diagram of the specific parameters and positions of the longitudinal section of the conical burr shown:

[0144] At the diameter L1 position of the conical burr 4, the outer contour of the conical burr 4 has points A1 and A3, and the line connecting points A1 and A3 is the diameter L1; the outer contour of the conical burr 4 also has point A2, and point A2 is located 0.1 mm away from the top of the burr; point A2 and point A1 are located on the same longitudinal section of the conical burr 4, the line connecting points A1 and A2 is line A1A2, the line connecting points A1 and A3 is line A1A3, and the angle between line A1A3 and line A1A2 is α2;

[0145] At the diameter L2 position of the conical burr 4, the outer contour of the conical burr 4 has points A4 and A5, and the line connecting the points A4 and A5 is the diameter L2; the points A4 and A1 are located on the same longitudinal section of the conical burr 4, the line connecting the points A4 and A1 is the line A4A1, the line connecting the points A4 and A5 is the line A4A5, and the angle between the lines A4A1 and A4A5 is α1;

[0146] The ratio range of α1 and α2 is: 1.0≥α1:α2≥0.25.

[0147] For specific experimental data, please refer to the following table:

[0148] α1:α2 ratio Binding rate Example 1 α1:α2＝0.25 98.2％ Example 2 α1:α2＝1.0 98.5％ Example 3 α1:α2＝0.3 99.2％ Example 4 α1:α2＝0.9 99.6％ Comparative Example 1 α1:α2＝0.21 97.1％ Comparative Example 2 α1:α2＝1.03 96.6％

[0149] It can be seen from the above table that in the preferred embodiment of the present invention, when the ratio of the angle α1 to the angle α2 is in the range of 1.0≥α1:α2≥0.25, the bonding rate between the burr and the cylinder body is significantly higher than when the ratio of the angle α1 to the angle α2 is in the range of α1:α2 is less than 0.25 or greater than 1.0. Among them, the tools related to obtaining the above data are as follows: The cutting tool used for cutting the radial direction of the cylinder sleeve 1 is a metal circular saw machine, model: Dongguan Jincheng Machinery Co., Ltd., JC-130-NC. The tool model of the super depth of field microscope is: Japan Keyence, VHX-2000.

[0150] In this embodiment, the appropriate number of conical burrs 4 can ensure the bonding rate between the multiple burrs on the cylinder liner 1 and the cylinder body, and improve the bonding strength. On the cylinder liner 1, the number of conical burrs 4 within 1 square centimeter is: 45 to 85.

[0151] In this embodiment, the burr density of the appropriate conical burr 4 can ensure the bonding rate between the multiple burrs on the cylinder liner 1 and the cylinder body, and improve the bonding strength. The surface is that the number of any 10mm long line segment of the conical burr 4 on the outer peripheral surface 2 of the cylinder liner 1 passing through the conical burr 4 is 6 to 11.

[0152] A burr detection method for a burr-shaped cast-in cylinder liner, comprising:

[0153] The method for detecting the diameter of the conical burr 4 at the position of 0.25 mm and 0.4 mm from the top thereof comprises the following steps:

[0154] Step S101, taking the end position of the cylinder liner 1, or the vertical cutting surface of the cylinder liner 1 in the radial direction as the detection surface 5;

[0155] Step S102, placing the detection surface 5 of the cylinder liner 1 under the objective lens of the ultra-depth-of-field microscope;

[0156] Step S103, turning the coarse focusing knob and the fine focusing knob until a clear image of the object is seen on the computer screen;

[0157] Step S104, using the object image of step S103, find the position of the burr 0.25mm and 0.4mm from the top of the burr downward and along the vertical direction respectively; wherein the burr distance to the top position is the highest point of the longitudinal section of the burr, and the allowable error of the distance from the burr to the top is: ±0.018mm;

[0158] Step S105, detecting the intercept L1 value of the burr at 0.25mm from the top and the intercept L2 value of the burr at 0.4mm from the top in step S104; wherein the diameters of the burr at 0.25mm and 0.4mm from the top are the horizontal lengths of the longitudinal section of the burr.

[0159] The detection method of the angle α1 and the angle α2 of the conical burr 4 is:

[0160] Step S301, according to the steps S101 to S104, respectively find the positions of the conical burr 4 at 0.25mm and 0.4mm from the top; Step S302, at the position of the burr at 0.25mm from the top in step S301, select the A1 point and the A3 point of the outer contour of the conical burr 4; through the ultra-depth microscope photograph of step S103, find the position of the burr at 0.1mm from the top downward and along the vertical direction; at the position of the burr at 0.1mm from the top, select the A2 point on the outer contour of the longitudinal section of the burr in the ultra-depth microscope photograph; through the angle measurement function of the ultra-depth microscope software, measure the angle α2 between the extension line of the connecting line A1A3 and the connecting line A1A2;

[0161] At the position of 0.4 mm from the top of the burr in step S301, select points A4 and A5 of the outer contour of the conical burr 4; and measure the angle α1 between the line A4A1 and the line A4A5 using the angle measurement function of the software of the ultra-depth of field microscope.

[0162] In this embodiment, the binding rate measurement method is specifically performed in the following steps:

[0163] Step S1, die-casting the cylinder liner in the cylinder body, controlling the aluminum molten temperature in the range of 700°C to 720°C, and the pouring temperature in the range of 650°C to 680°C; controlling the cylinder liner preheating temperature to 130-150°C, using a 28000KN die-casting machine, setting the slow pressure injection speed to 0.2m / s, and the fast pressure injection speed to 5.5m / s; setting the final pressure to maintain 45MPa;

[0164] Step S2, cutting the die-cast cylinder body at a position 25-35 mm from the top of the cylinder liner, and cutting the die-cast cylinder body at a position 25-35 mm from the rear end of the cylinder liner;

[0165] Afterwards, the annular end surfaces of the top end and the tail end of the cylinder liner are polished with sandpaper, respectively with 180 mesh, 400 mesh, and 800 mesh water sandpaper, and the end surfaces are polished on a polishing machine as needed;

[0166] Step S3, for the top and tail ends of the polished cylinder liner, detect the bonding rate between the aluminum cylinder body and the outer diameter of the cylinder liner. The specific detection positions are: Figure 6 As shown, there are four sections of cylinder liner outer diameter positions A with a circumference of 10 mm at 90 degree intervals; the specific detection method is:

[0167] Step S301, using an ultra-depth-of-field microscope, measuring the length of the porosity within a circumference of 10000 μm along the burr surface; wherein, if there is a gap between the aluminum cylinder block and the cast iron of the cylinder liner 1 by visual observation under the microscope, it means that there is a pore at this position; the length of the gap is the length of the pore;

[0168] Step S302, the bonding ratio between the aluminum cylinder block and the outer diameter of the cylinder sleeve is calculated by the bonding ratio calculation formula, bonding ratio = (100 - (∑ pore length 2 / 100000000)%; wherein the unit of length of the pore is μm.

[0169] Of course, in this embodiment, the ratio range of α1 and α2 is not specifically limited. In other embodiments, the ratio range of α1 and α2 may also be: α1:α2<0.25; or, α1:α2>1.0.

[0170] Of course, in this embodiment, the number of the tapered burrs 4 on the cylinder liner 1 is not specifically limited. In other embodiments, the number of the tapered burrs 4 on the cylinder liner 1 within 1 square centimeter can be less than 45, or greater than 85.

[0171] Of course, in the present embodiment, there is no specific limitation on the number of any 10 mm long line segments on the outer circumferential surface 2 of the cylinder liner 1 that pass through the conical burrs 4. In other embodiments, the number of any 10 mm long line segments on the outer circumferential surface 2 of the cylinder liner 1 that pass through the dumbbell-shaped burrs 3 may be less than 6 or greater than 11.

[0172] Of course, in this embodiment, the specific method of casting the cylinder liner 1 into the cylinder body is not specifically limited. In other embodiments, the cylinder liner 1 is made of cast iron and cast into the cylinder body by a gravity casting process.

[0173] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A burr-shaped cast-in cylinder liner, wherein the cylinder liner (1) is made of cast iron and is cast into a cylinder body by die casting or gravity casting, and a plurality of burrs are formed on the outer peripheral surface (2) of the cylinder liner (1), characterized in that: At least one of the glitches satisfies: The diameter of the burr at a position 0.25 mm from the top is L1, and the diameter of the burr at a position 0.4 mm from the top is L2; ​​the ratio range of the diameter L1 to the diameter L2 is: 0.65≤L1:L2≤1.15; The burr comprises a protrusion in a necked shape, and the protrusion is in a necked structure at a distance of 0.2 mm to 0.35 mm from the top of the burr; or, the burr comprises a conical protrusion.

2. The burr-shaped cast-in cylinder liner according to claim 1, characterized in that: The protrusion in the shape of a neck is a dumbbell-shaped burr (3); At the diameter L1 position of the dumbbell-shaped burr (3), the outer contour of the dumbbell-shaped burr (3) has points A1 and A3, and the line connecting points A1 and A3 is the diameter L1; the outer contour tip of the dumbbell-shaped protruding position of the dumbbell-shaped burr (3) also has point A2; point A2 and point A1 are located on the same longitudinal section of the dumbbell-shaped burr (3), the line connecting points A1 and A2 is line A1A2, the line connecting points A1 and A3 is line A1A3, and the angle between the extension line of line A1A3 and line A1A2 is α2; At the position of the diameter L2 of the dumbbell-shaped burr (3), the outer contour of the dumbbell-shaped burr (3) has a point A4 and a point A5, and the line connecting the point A4 and the point A5 is the diameter L2; the point A4 and the point A1 are located on the same longitudinal section of the dumbbell-shaped burr (3), the line connecting the point A4 and the point A1 is the line A4A1, the line connecting the point A4 and the point A5 is the line A4A5, and the angle between the line A4A1 and the line A4A5 is α1; The ratio range of α1 and α2 is: α1:α2≥0.

5.

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

1.

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

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

6. The burr-shaped cast-in cylinder liner according to claim 1, characterized in that: The pointed cone-shaped protrusion is a cone-shaped burr (4); At the diameter L1 position of the conical burr (4), the outer contour of the conical burr (4) has points A1 and A3, and the line connecting points A1 and A3 is the diameter L1; the outer contour of the conical burr (4) also has point A2, and point A2 is located 0.1 mm away from the top of the burr; point A2 and point A1 are located on the same longitudinal section of the conical burr (4), the line connecting points A1 and A2 is line A1A2, the line connecting points A1 and A3 is line A1A3, and the angle between line A1A3 and line A1A2 is α2; At the diameter L2 position of the conical burr (4), the outer contour of the conical burr (4) has points A4 and A5, and the line connecting the points A4 and A5 is the diameter L2; the points A4 and A1 are located on the same longitudinal section of the conical burr (4), the line connecting the points A4 and A1 is the line A4A1, the line connecting the points A4 and A5 is the line A4A5, and the angle between the lines A4A1 and A4A5 is α1; The ratio range of α1 and α2 is: α1:α2≥0.

25.

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

0.

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

9. The burr-shaped cast-in cylinder liner according to claim 6 or 7, characterized in that: In any 10 mm long line segment on the outer peripheral surface (2) of the cylinder liner (1), the number of conical burrs (4) passing through is between 6 and 11.

10. A method for detecting burrs of burr-shaped cast-in cylinder liners, characterized in that: include: The method for detecting the diameter of the burr at a position of 0.25 mm and 0.4 mm from the top of the burr comprises the following steps: Step S101, taking the end position of the cylinder liner (1), or a vertical cutting surface in the radial direction of the cylinder liner (1) as a detection surface (5); Step S102, placing the inspection surface (5) of the cylinder liner (1) under the objective lens of an ultra-depth-of-field microscope; Step S103, turning the coarse focusing knob and the fine focusing knob until a clear image of the object is seen on the computer screen; Step S104, using the object image of step S103, find the position of the burr 0.25mm and 0.4mm from the top of the burr downward and along the vertical direction respectively; wherein the burr distance to the top position is the highest point of the longitudinal section of the burr, and the allowable error of the distance from the burr to the top is: ±0.018mm; Step S105, detecting the intercept L1 value of the burr at 0.25mm from the top and the intercept L2 value of the burr at 0.4mm from the top in step S104; wherein the diameters of the burr at 0.25mm and 0.4mm from the top are the horizontal lengths of the longitudinal section of the burr.

11. The burr detection method for a burr-shaped cast-in cylinder liner according to claim 10, characterized in that: The burr detection method is applied to the burr-shaped cast-in cylinder liner described in claim 1.

12. The burr detection method for a burr-shaped cast-in cylinder liner according to claim 10, characterized in that: The burr detection method is applied to the burr-shaped cast-in cylinder liner according to any one of claims 2 to 5; The detection method of the angle α1 and the angle α2 of the dumbbell-shaped burr (3) is: Step S201, according to the steps S101 to S104, respectively finding the positions of the dumbbell-shaped burr (3) at 0.25 mm and 0.4 mm from the top; Step S202, at a position 0.25 mm from the top of the burr in step S201, select point A1 and point A3 of the outer contour of the dumbbell-shaped burr (3); select point A2, the tip of the outer contour of the dumbbell-shaped protrusion of the dumbbell-shaped burr (3); wherein point A2 is the outermost position of the dumbbell-shaped protrusion of the longitudinal section of the burr in step S103 and the ultra-depth of field microscope photograph, and the outermost position of the dumbbell-shaped protrusion has an allowable error of ±0.018 mm; and measure the angle α2 between the extension line of the line A1A3 and the line A1A2 through the angle measurement function of the software of the ultra-depth of field microscope; At a position 0.4 mm from the top of the burr in step S201, select points A4 and A5 of the outer contour of the dumbbell-shaped burr (3); and measure the angle α1 between the line A4A1 and the line A4A5 using the angle measurement function of the software of the ultra-depth microscope.

13. The burr detection method for a burr-shaped cast-in cylinder liner according to claim 10, characterized in that: The burr detection method is applied to the burr-shaped cast-in cylinder liner according to any one of claims 6 to 9; The detection method of the angle α1 and the angle α2 of the conical burr (4) is: Step S301, according to the steps S101 to S104, respectively finding the positions of the conical burr (4) at 0.25 mm and 0.4 mm from the top; Step S302, at the position of 0.25 mm from the top of the burr in step S301, select point A1 and point A3 of the outer contour of the conical burr (4); through the ultra-depth microscope photograph of step S103, find the position of 0.1 mm from the top of the burr downward in the vertical direction; at the position of 0.1 mm from the top of the burr, select point A2 on the outer contour of the longitudinal section of the burr in the ultra-depth microscope photograph; measure the angle α2 between the extension line of the line A1A3 and the line A1A2 through the angle measurement function of the ultra-depth microscope software; At a position of 0.4 mm from the top of the burr in step S301, select points A4 and A5 of the outer contour of the conical burr (4); and measure the angle α1 between the line A4A1 and the line A4A5 using the angle measurement function of the software of the ultra-depth of field microscope.

14. The burr detection method for a burr-shaped cast-in cylinder liner according to claim 10, characterized in that: The burr detection method for a burr-shaped cast-in cylinder liner is used to detect L1 and L2 of the burr-shaped cast-in cylinder liner described in claims 1 to 11.

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