An inner wall scraper and its processing method

Abstract

The present invention relates to the technical field of burr removal for welded pipes, and discloses an inner wall scraper and a processing method thereof, including a blade taper wall, a blade inner wall, and a cutting edge formed by the connection between the top of the blade taper wall and the top end of the blade inner wall. The cutting edge is arranged in a ring shape. The cutting edge is used to contact the weld scar on the inner wall during the welding process of the welded pipe and scrape off the burrs therefrom, so that the burrs enter the blade inner wall through the chip removal inlet formed by the ring-shaped surrounding of the cutting edge. The included angle between the extension line of the top end of the blade inner wall and the top of the blade taper wall is a first included angle, and the first included angle is an obtuse angle; the longitudinal section included angle of the cutting edge is complementary to the first included angle, and the cutting edge forms a sharp edge; the blade inner wall is provided with a chip removal channel in a conical hole structure for the burrs to pass through. The present invention improves the sharpness of the cutting edge of the cutting edge.

Description

Technical Field

[0001] The invention relates to the technical field of welded pipe burr removal, and in particular to an inner wall scraper and a processing method thereof. Background Art

[0002] The development of precision welded pipes marks a major advancement in the manufacturing industry's demand for high-precision, high-efficiency pipes. It plays an indispensable role in key industries such as aerospace, automobile manufacturing, petrochemicals, and medical devices. With the continuous innovation of technology, precision welded pipes not only achieve stricter dimensional tolerances and surface finish requirements, but also have higher strength and corrosion resistance, ensuring reliability and safety under complex working conditions. Its importance lies in its ability to significantly improve the overall performance of the system, reduce the risk of leakage, extend the life of the equipment, and support the stringent standards for material quality and process accuracy in high-end application fields, promoting the development of related industries to a higher level.

[0003] Precision welded pipes have high requirements for the surface quality after weld scraping, and do not allow for many burrs or deep scratches. In the process of removing burrs from the inner wall of welded pipes, in order to remove burrs in the workpiece hole while guiding the burrs to be discharged, reducing the generation of secondary burrs; and the inner wall can support the blade, so an inner wall scraper is used as a blade to scrape and discharge burrs.

[0004] At present, the existing inner wall scrapers focus more on increasing the sharpness of the blade to reduce the burrs on the inner wall of the welded pipe and prevent the generation of secondary burrs. However, in actual processing and production, due to the increase in the sharpness of the blade, it is easy to cause the blade edge to break. If the service life of a single inner wall scraper is short, multiple inner wall scrapers are required to complete the scraping of multiple welded pipes in a batch. This will cause the quality of welded pipes processed in the same batch to be uneven, and the processing cost is also high.

[0005] In the prior art, there is a burr processing blade for welding pipes with a published patent application number of CN201921504651.9, or a tool for quickly removing burrs from press-fit bolts with a published patent application number of CN201510398529.8, or an end face burr improvement milling cutter with a published patent application number of CN202122981939.9, or a disc blade deburring machine tool bar assembly with a published patent application number of CN201320008599.4, which uses the cutting edge of the blade provided on the cone wall of the blade to cut burrs. In order to reduce the difficulty of processing the blade, such as Figure 1As shown, the rake face on the blade taper wall serves as the cutting edge. The cutting edge of the blade is circularly arranged. The cutting edge is used to contact the weld scar on the inner wall of the pipe to be processed and scrape off the burrs therefrom, enabling the burrs to enter the inner wall of the blade through the chip removal inlet formed by the circular surrounding of the cutting edge. The inner wall of the blade is perpendicular to the closed circular plane formed by the chip removal inlet. The upper part of the inner wall of the blade is a chip removal channel with a cylindrical structure. The inner wall of the blade is used to guide and discharge the burrs. However, the angle of such a cutting edge itself is relatively large, making the cutting edge itself rather dull. Not only is the deburring efficiency low, but also the single deburring rate is relatively low. When encountering relatively large burrs, it is easy for relatively large burr chips to enter the inner wall of the blade. Such relatively large burr chips will cause poor chip removal in the inner wall of the blade, resulting in blockage of the inner wall of the blade. This not only reduces the deburring efficiency, but also the stuck chips are likely to cause chipping of the cutting edge of the blade, reducing the service life of the blade. Summary of the Invention

[0006] The present invention aims to provide an inner wall scraping tool and its processing method, which solves the problem of poor chip discharge in the inner wall of the blade, improves the sharpness of the inner wall of the blade, and extends the service life of the scraping tool.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] First solution: An inner wall scraping tool and its processing method, including a blade taper wall, an inner wall of the blade, and a cutting edge formed by the connection between the top of the blade taper wall and the top end of the inner wall of the blade. The cutting edge is circular. The cutting edge is used to contact the weld scar on the inner wall during the welding process of the welded pipe and scrape off the burrs therefrom, enabling the burrs to enter the inner wall of the blade through the chip removal inlet formed by the circular surrounding of the cutting edge. The included angle between the extension line of the top end of the inner wall of the blade and the top of the blade taper wall is the first included angle, and the first included angle is an obtuse angle; the longitudinal section included angle of the cutting edge is complementary to the first included angle, and the cutting edge forms a sharp edge; the inner wall of the blade is provided with a chip removal channel in a conical hole structure for the burrs to pass through. The chip removal channel includes a first conical inner wall connected to the cutting edge at the top and a second conical inner wall connected to the first conical inner wall; the extended lines of the bottom cone surfaces of the first conical inner wall and the second conical inner wall both extend towards the blade taper wall; the cone angle of the first conical inner wall is smaller than the cone angle of the second conical inner wall. The first conical inner wall extends downward along the cutting edge and surrounds its peripheral surface to form a first conical chip removal channel, and the second conical inner wall extends downward along the end of the first conical tube and surrounds the peripheral surface of the second conical inner wall to form a second conical chip removal channel. The cross-sectional area of the second conical chip removal channel is greater than or equal to the cross-sectional area of the first conical chip removal channel; the first conical chip removal channel and the second conical chip removal channel are connected to each other to form a continuous chip removal channel.

[0009] The principle and advantages of this solution are as follows: Different from the structure of the prior art, in practical applications, by setting the inner wall of the blade to be a conical structure composed of multiple combinations, the included angle between the extension line of the top end of the inner wall of the blade and the top of the conical wall of the blade is an obtuse angle, so that the included angle of the cutting edge itself is smaller, the cutting edge becomes sharper, and the cutting edge forms a sharp edge. The sharper cutting edge not only easily scrapes off burrs, but also scrapes off a relatively large amount of burrs in a short time. With a large amount of burrs entering the inner wall of the blade in a short time, it is easy to have the situation of burrs clogging the inner wall of the blade. At the same time, the inner wall of the blade in the shape of a cone can further increase the chip removal amount, avoiding the phenomenon that more burrs are scraped off in a short time after the blade becomes sharp and causing burrs to clog the inner wall of the blade, thereby preventing the burrs from clogging and easily chipping the cutting edge, and improving the service life of the inner wall scraper.

[0010] Specifically, first, the included angle between the extension line of the top end of the inner wall of the blade and the top of the conical wall of the blade is the first included angle, and the first included angle is an obtuse angle. The cutting edge forms a sharp edge, making the included angle of the cutting edge itself smaller to improve the sharpness of the cutting edge. It can contact the inner wall of the welded pipe to be processed and almost completely remove the burrs on the inner wall of the welded pipe at one time. Compared with the inner wall scraper used in the prior art, more burrs are removed and enter the inner wall of the blade. The sharp edge of the cutting edge can also increase the outflow space of the burrs during the deburring process, reduce the generation of built-up edge on the cutting edge, and thus improve the quality of the weld surface.

[0011] Secondly, a first conical inner wall connected to the cutting edge and a second conical inner wall connected to the first conical inner wall are provided. The extension lines of the bottom cone surfaces of both of them extend towards the conical wall of the blade. In this way, the chip removal amount per unit area of the cross-section of the inner wall of the blade is increased, the volume of the inner wall of the blade is increased, the phenomenon of the cutting edge being chipped due to chip clogging is avoided, and the service life of the blade is improved.

[0012] Moreover, the first conical inner wall extends downward along the cutting edge and surrounds the surrounding surface to form a first conical chip removal channel. A second conical chip removal channel is formed around the end of the first conical tube. The cross-sectional area of the second conical chip removal channel is not less than the cross-sectional area of the first conical chip removal channel. Compared with the first conical tube, the chip removal space of the second conical chip removal channel is large, enabling the chip removal in the inner wall of the blade to be smooth, avoiding the phenomenon of the cutting edge being chipped due to chip clogging, and improving the service life of the blade.

[0013] Immediately afterwards, the taper of the first conical inner wall is smaller than the taper of the second conical inner wall. This can also facilitate the tool for grinding to retract from the second conical chip removal channel formed by the second conical inner wall when grinding the first conical inner wall, avoiding the tool for processing the first conical inner wall from touching and wearing the second conical inner wall.

[0014] While increasing the sharpness of the cutting edge of the inner wall scraping blade, the volume of the inner wall of the blade is also increased, avoiding the phenomenon of chipping blockage causing the cutting edge of the blade to break, and improving the service life of the blade. In actual production, it can meet the scraping of multiple welded pipes in a batch with one inner wall scraping tool, reducing the production and processing costs while ensuring the stability of the processing quality of multiple welded pipes in the same batch.

[0015] Finally, in the prior art, the circular plane formed by the closed enclosure of the inner wall of the blade and the annular cutting edge, that is, the chip discharge inlet is not tangent. This is because when machining the first conical wall, the axial direction of the conventional internal hole grinding wheel and the axial direction of the inner hole of the blade blank are kept parallel, so the inner wall of the blade is perpendicular to the blade. Once the included angle between the inner wall of the blade and the cutting edge is an obtuse angle, the internal hole grinding wheel needs to be adjusted. Ordinary technicians believe that this requires modifying or even adjusting the internal hole grinding wheel to keep the axial direction of the internal hole grinding wheel parallel to the axial direction of the inner wall of the scraping tool, and the modification difficulty is relatively large. This solution improves the inner wall of the blade, which can not only improve the sharpness of the cutting edge, but also increase the chip discharge amount, avoid the phenomenon of burr congestion, and improve the service life of the blade.

[0016] Preferably, the taper angle of the first conical inner wall is 3°-15°.

[0017] Beneficial effect: When the taper angle of the first conical inner wall is less than 3°, it cannot improve the chip discharge space; when the taper angle of the first conical inner wall is greater than 15°, it cannot support the cutting edge, and the cutting edge is prone to damage after multiple scrapings. Only when the taper angle of the first conical inner wall is 3°-15° can it support the cutting edge and improve the chip discharge space at the same time.

[0018] Preferably, the first included angle is 123°-155°.

[0019] Beneficial effect: When the first included angle is 155°, the included angle of the cutting edge itself is minimized, and the cutting edge forms a sharp edge, so as to greatly improve the sharpness of the cutting edge and be able to remove the burrs on the inner wall of the welded pipe at one time and almost completely.

[0020] Preferably, the ratio of the length of the first conical inner wall to the length of the second conical inner wall ranges from 0.3 to 1.

[0021] Beneficial effect: The length of the first conical inner wall is less than or equal to the length of the second conical inner wall. When the ratio of the length of the first conical inner wall to the length of the second conical inner wall is greater than 1, the chip discharge space is reduced; when the ratio of the length of the first conical inner wall to the length of the second conical inner wall is less than 0.3, the supporting effect on the cutting edge is poor; therefore, when the ratio of the length of the first conical inner wall to the length of the second conical inner wall is 0.3-1, it can not only improve the chip discharge space, but also play a good supporting role for the cutting edge.

[0022] Second Solution: A processing method for an inner wall scraper, which is used to process an annular scraper blank into an inner wall scraper product as described in the first solution, including: S1, press and sinter the annular scraper blank to form an annular scraper blank body. The annular scraper blank body has an inner hole, and the inner hole is composed of a first-stage inner hole and a second tapered hole that are connected in sequence from the cutting edge downward. Among them, the first-stage inner hole has no taper and the hole wall line is perpendicular to the bottom surface of the annular scraper blank body. The inner wall of the second tapered hole is a second tapered inner wall, and the taper of the second tapered hole is 5°-25°; S2, clamp with the outer cylindrical surface of the scraper blank of the annular scraper blank body as the installation reference, grind a smooth through hole along the first-stage inner hole to form a first tapered inner wall blank body; then grind the bottom surface of the blade flat and shiny with a grinding wheel to form a second annular scraper blank body; S3, grind the outer cylindrical surface of the blade blank, and use the light-transmitting inner through hole as the positioning reference to grind the outer wall of the second annular scraper blank body along the outer wall connected to the top of the light-transmitting inner through hole to form a third annular scraper blank body with a blade tapered wall; S4, grind the first cylindrical inner wall according to the allowance to form a preliminary tapered inner wall; S5, compare whether the structure of the preliminary tapered inner wall matches that of the first tapered inner wall according to the first judgment condition. If they do not match, grind the preliminary tapered inner wall again according to the remaining allowance; if they match, an inner wall scraper product is formed. Among them, the first judgment condition includes that the preliminary tapered inner wall has not deformed, the included angle between the extension line of the top of the preliminary tapered inner wall and the top of the blade tapered wall is the first included angle, and the taper angle of the preliminary tapered inner wall is 3°-15°. If any one of the first judgment conditions is not met, it is considered not to match.

[0023] Beneficial effects: First, press and sinter the second tapered inner wall, then grind the blade tapered wall, and finally grind the second tapered inner wall, so that a delicate inner wall scraper can be made, the yield rate of the inner wall scraper is improved, and the production cost is reduced.

[0024] Preferably, when the diameter of the blade tapered wall is less than 22 mm, the allowance is 0.2 mm; when the diameter of the blade tapered wall is not less than 22 mm, the allowance is 0.2 mm - 0.4 mm.

[0025] Beneficial effects: Leave allowances according to different blade tapered walls, so that an inner wall scraper closer to the standard blade inner wall can be obtained when making the inner wall of the blade, reducing the amount of waste products generated when making the inner wall scraper, thereby reducing the production cost.

[0026] The third solution: A deburring tool using an inner wall scraper, including a tool rod. A main chip evacuation pipe is provided on the tool rod, and an inner wall scraper applied to the first solution is used. The tool rod is provided with a first installation position and a second installation position. A first blade and a second blade are respectively installed at the first installation position and the second installation position. The first blade and the second blade are used to remove the inner wall burrs of the welded pipe simultaneously. The first blade and the second blade are an inner wall scraper. The deburring tool using the inner wall scraper forms a double-blade deburring structure. A chip evacuation distance is provided between the first blade and the second blade. The exposed height of the first blade relative to the second blade is a first value. The central axis of the first blade forms a first chip evacuation angle with the axis of the welded pipe, and the central axis of the second blade forms a second chip evacuation angle with the axis of the welded pipe. The chip evacuation channels respectively formed on the inner walls of the blades of the first blade and the second blade are both communicated with the main chip evacuation pipe.

[0027] Beneficial effects: The deburring tool using the inner wall scraper removes the inner wall burrs of the welded pipe simultaneously by setting the first blade and the second blade, so as to achieve the effect of removing the inner wall burrs of the welded pipe once and completely. The speed of removing burrs is fast, and no scratches are caused to the welded pipe.

[0028] Preferably, the first chip evacuation angle is 15° - 35°; the second chip evacuation angle is 15° - 35°.

[0029] Beneficial effects: First, by setting the first chip evacuation angle and the second chip evacuation angle of the two first blades and the second blade, when the chip evacuation angle is within the range of 15° - 35°, the contact angle between the blade and the inner wall of the welded pipe is relatively reasonable, which can make the blade cut into the burrs on the inner wall of the welded pipe more smoothly during the scraping process, so as to scrape off more burrs per unit time, significantly improve the deburring efficiency, reduce the processing time, and improve the production efficiency. Second, the chip evacuation angle within this range is beneficial to controlling the removal amount and removal effect of burrs, avoiding incomplete removal of burrs or excessive scraping of the inner wall of the welded pipe due to too large or too small an angle, thus ensuring the surface quality of the inner wall of the welded pipe, meeting the strict requirements of the surface quality of the welded pipe for the weld scraping, and reducing the defective product rate caused by processing defects.

[0030] Preferably, the first value is 1 mm - 10 mm.

[0031] Beneficial effects: First, when the first value is in the range of 1 mm to 10 mm, it can enable the first blade and the second blade to form a reasonable cutting layer during the scraping process. The first blade first performs a preliminary scraping on the burrs on the inner wall of the welded pipe to remove most of the burrs; subsequently, the second blade performs a fine scraping on the remaining small amount of burrs to further improve the smoothness of the inner wall of the welded pipe. This hierarchical scraping method can more thoroughly remove the burrs on the inner wall of the welded pipe, improve the overall deburring effect, and meet the strict requirements for the inner wall quality of precision welded pipes. An appropriate exposed height helps to maintain the stability of the tool during the scraping process. An excessive exposed height may cause large vibrations of the tool during high-speed rotation or reciprocating motion, affecting the scraping accuracy and tool life; while an overly small exposed height may cause uneven force on the tool during scraping, resulting in tool wobbling or jumping. The exposed height range of 1 mm to 10 mm can effectively control the vibration and wobbling of the tool while ensuring the scraping effect, making the tool run more smoothly during the processing, improving the reliability of the processing process and the service life of the tool. Finally, in actual production, according to different processing conditions and the conditions of the welded pipe, it may be necessary to finely adjust the exposed height of the tool. The range of 1 mm to 10 mm provides sufficient space for adjustment, and the staff can flexibly adjust the exposed height of the first blade according to the actual situation to achieve the best scraping effect. Description of the Drawings

[0032] Figure 1 is a cross-sectional view of the inner wall scraper of the prior art;

[0033] Figure 2 is a cross-sectional view of the inner wall scraper of Embodiment 1 (a);

[0034] Figure 3 is a cross-sectional view of the inner wall scraper of Embodiment 1 (b);

[0035] Figure 4 is a schematic structural diagram of the deburring tool using the inner wall scraper of Embodiment 3 (a);

[0036] Figure 5 is a schematic structural diagram of the deburring tool using the inner wall scraper of Embodiment 3 (b);

[0037] Figure 6 is a schematic structural diagram of the deburring tool using the inner wall scraper of Embodiment 3 (c);

[0038] Figure 7 is a schematic structural diagram of the deburring tool using the inner wall scraper of Embodiment 3 (d);

[0039] Figure 8 is a schematic structural diagram of the deburring tool using the inner wall scraper of Embodiment 3 (e);

[0040] Figure 9 Cross-sectional view (a) of the comparison inner wall scraper for Experiment 1;

[0041] Figure 10 Cross-sectional view (b) of the comparison inner wall scraper for Experiment 1.

[0042] The reference numerals in the attached drawings of the specification include:

[0043] Inner wall of blade 1, tapered wall of blade 2, tool shank 3, welded pipe 4, first blade 5, second blade 6, first tapered inner wall 11, second tapered inner wall 12, first tapered chip removal channel 13, second tapered chip removal channel 14, cutting edge 21, burr 41, cutting edge opening 211, chip removal inlet 212. Detailed implementation manners

[0044] Example 1

[0045] As Figure 2 and Figure 3 shown, this example provides an inner wall scraper, which includes a tapered wall of blade 2, an inner wall of blade 1, and a cutting edge opening 211 formed at the junction of the top of the tapered wall of blade 2 and the top end of the inner wall of blade 1. The cutting edge opening 211 is arranged in a ring shape and is used to contact the weld scar on the inner wall of the to-be-processed welded pipe 4 and scrape off the burr 41 therefrom, so that the burr 41 enters the inner wall of blade 1 through the chip removal inlet 212 formed by the ring-shaped surrounding of the cutting edge opening 211. The included angle between the extension line of the top end of the inner wall of blade 1 and the top of the tapered wall of blade 2 is the first included angle, and the first included angle is an obtuse angle; the included angle of the longitudinal section of the cutting edge opening 211 is complementary to the first included angle, and the cutting edge opening 211 forms a sharp edge; the inner wall of blade 1 is provided with a chip removal channel in a tapered hole structure for the burr 41 to pass through. The chip removal channel includes a first tapered inner wall 11 connected to the cutting edge opening 211 at the top end and a second tapered inner wall 12 connected to the first tapered inner wall 11; the extended lines of the bottom cone surfaces of the first tapered inner wall 11 and the second tapered inner wall 12 both extend towards the tapered wall of blade 2; the cone angle of the first tapered inner wall 11 is smaller than the cone angle of the second tapered inner wall 12. As Figure 2 shown, the middle dotted line in the figure is the demarcation line between the first tapered inner wall 11 and the second tapered inner wall 12. The first tapered inner wall 11 extends downward along the cutting edge opening 211 and surrounds the surrounding surface to form a first tapered chip removal channel 13, and a second tapered chip removal channel 14 is formed by surrounding the end of the first tapered pipe. The first tapered pipe is above the dotted line, and the second tapered pipe is below the dotted line. The cross-sectional area of the second tapered chip removal channel 14 is not less than the cross-sectional area of the first tapered chip removal channel 13; the first tapered chip removal channel 13 and the second tapered chip removal channel 14 form the chip removal channel.

[0046] Specifically, the chip removal channel on the inner wall of the blade 1 has a conical hole structure. The inner wall of the blade 1 includes a first conical inner wall 11 and a second conical inner wall 12. Both the first conical inner wall 11 and the second conical inner wall 12 have an "eight" - shaped structure, that is, the extension lines of the conical surfaces of the first conical inner wall 11 and the second conical inner wall 12 both face the conical wall 2 of the blade. Among them, there is an included angle between the first conical inner wall 11 and the second conical inner wall 12, and it can be in an obtuse - angle form. As Figure 3 shown, when the outer - contour projection of the cutting edge 21 is mapped on the outer contour of the first conical inner wall 11, for a vivid description, it forms a vertical shape at this time. The line of the outer - contour projection of the cutting edge 21 is shorter than the line of the outer contour of the first conical inner wall 11. The outer contour of the first conical inner wall 11 covers the outer - contour projection surface of the cutting edge 21, and the first conical inner wall 11 is used to support the cutting edge 21.

[0047] The taper angle of the first conical inner wall 11 is α, 3° ≤ α ≤ 15°. In this embodiment, α = 15°. The taper angle of the second conical inner wall 12 is β, 5° ≤ β ≤ 25°. The length ratio of the first conical inner wall 11 to the second conical inner wall 12 is 0.3 - 1. The angle between the inner wall of the blade 1 and the cutting edge 211 is θ, 123° ≤ θ ≤ 155°.

[0048] Embodiment Two

[0049] This embodiment provides a processing method for an inner - wall scraper, which is used to process an annular scraper blank into an inner - wall scraper product as described in Embodiment One, including:

[0050] S1, press - sinter the annular scraper blank to form an annular scraper blank body. The annular scraper blank body has an inner hole, and the inner hole is composed of a first - stage inner hole and a second conical hole that are connected in sequence from the cutting edge downwards; among them, the first - stage inner hole has no taper and its hole - wall line is perpendicular to the bottom surface of the annular scraper blank body, and the inner wall of the second conical hole is the second conical inner wall, and the taper of the second conical hole is 5° - 25°.

[0051] Specifically, the annular scraper blank is press - sintered into shape by using a mold. This mold can be made correspondingly according to the first - stage inner hole and the second conical hole of the annular scraper blank. This mold is a conventional setting that is easy in the prior art in this field. The creativity lies in that the structure of the second conical hole is the same as that of the second conical inner wall, which is convenient for subsequent making of the first conical inner wall. It can not only facilitate the feeding and retracting of the tool, but also be directly calcined into shape by the mold, which can improve the processing efficiency of the inner - wall scraper.

[0052] In the preparation stage of the grinding process for the inner wall of the first conical shape, an annular preliminary scraper blank is installed on a grinding tool. The grinding tool includes a cutting tool, an internal hole grinding wheel for grinding the inner hole of the annular preliminary scraper blank, a spring chuck tooling, a chuck base for clamping the cutting tool, a fixture for clamping the annular scraper blank, and a three-jaw chuck. The spring chuck tooling is installed on the three-jaw chuck and is used for positioning and grinding the outer surface of the annular preliminary scraper blank. The spring chuck tooling is fixedly installed with the annular preliminary scraper blank, and the cutting tool is installed on the spring chuck tooling. The first conical inner wall is ground by rotating the internal hole grinding wheel. The axial direction of the annular preliminary scraper blank is parallel to the axial direction of the internal hole grinding wheel. In this embodiment, the bottom surface of the preliminary scraper blank is close to the already formed second conical inner wall.

[0053] S2. Clamp with the outer circular surface of the scraper blank of the annular scraper blank as the installation reference, grind out a smooth through hole along the first section of the inner hole to form a first conical inner wall blank; then grind the bottom surface of the blade flat and shiny with a grinding wheel to form a second annular scraper blank. Among them, the surface profile of the first conical inner wall blank forms a first cylindrical inner wall, and the radius of the first cylindrical inner wall is greater than the minimum radius of the second conical hole. The difference between the radius of the first cylindrical inner wall and the minimum radius of the second conical hole is the allowance. The ratio of the length of the second conical hole to the length of the smooth through hole is 0.3 - 1.

[0054] Specifically, the difference from the existing processing method for the inner wall of the scraper can also be reflected in different processing steps. When manufacturing the existing inner wall of the scraper, the process of grinding the inner wall 1 of the blade is placed before grinding the conical wall 2 of the blade. This is because the existing inner wall 1 of the blade has a single cylindrical structure, with a simple structure, which can be completed by a single knife cut or directly by die forging, and the inner wall 1 of the blade needs to be made translucent to grind the conical wall 2 of the blade. Therefore, for the processing steps provided in this embodiment, if the processing of the first conical inner wall is placed before the processing of the conical wall 2 of the blade, the inner wall 1 of the blade has already formed a conical inner wall with different taper degrees, making it difficult to position the processing position of the unprocessed blank of the conical wall 2 of the blade. In this embodiment, the plane connected to the top of the second conical inner wall is used as the first grinding reference surface, which is equivalent to the circular horizontal plane at the top of the first section of the inner hole that is not penetrated. The axis of the translucent inner through hole passes through the center point on this circular horizontal plane. The difference between the wall thickness of the smooth through hole and the wall thickness of the second conical inner wall is the allowance. As Figure 3 shown, when the diameter of the conical wall 2 of the blade is less than 22 mm, the allowance is 0.2 mm; when the diameter of the conical wall 2 of the blade is not less than 22 mm, the allowance is 0.2 mm - 0.4 mm. In this embodiment, the diameter of the conical wall 2 of the blade is the diameter of the conical wall 2 of the blade defined on the manufacturing drawing. By grinding out the translucent inner through hole and using the translucent inner through hole as the reference, the conical wall 2 of the blade that meets the standard size can be accurately ground.

[0055] S3. Polish the outer wall surface of the second annular scraper blank, with the light-transmitting inner through-hole as the positioning reference, and polish the outer wall of the second annular scraper blank along the outer wall connected to the top of the light-transmitting inner through-hole to form a third annular scraper blank with a blade taper wall.

[0056] Specifically, compared with the prior art of first manufacturing the blade taper wall and then manufacturing the inner wall of the blade based on the blade taper wall as the reference, in this embodiment, the second tapered inner wall is first press-fired and formed by a mold, and then the light-transmitting inner through-hole is cut out with the circular plane close to the top of the second tapered inner wall as the reference. By using the light-transmitting inner through-hole as the positioning reference, the blade taper wall of the second annular scraper blank is polished. In this embodiment, the deflection angle of the three-jaw chuck can be adjusted to be the same as the angle of the required blade taper wall 2 to grind out the required blade taper wall 2. Those skilled in the art should be familiar that both the outer wall of the blade and the blade taper wall 2 are the outer contours of the blade. The difference is that the outer wall of the blade has no taper, while the blade taper wall 2 has a taper.

[0057] S4. Polish the first cylindrical inner wall according to the allowance to form a preliminary tapered inner wall. S5. Compare whether the structure of the preliminary tapered inner wall matches that of the first tapered inner wall according to the first judgment condition. If not, grind the preliminary tapered inner wall again according to the remaining allowance; if it matches, an inner wall scraper product is formed. Among them, the first judgment condition includes that the preliminary tapered inner wall has not deformed, the included angle between the extension line of the top of the preliminary tapered inner wall and the top of the blade taper wall is the first included angle, and the taper angle of the preliminary tapered inner wall is 3° - 15°; if any one of the first judgment conditions is not satisfied, it is considered not to match.

[0058] The thickness of the first cylindrical inner wall has an allowance, which means that the thickness of the first cylindrical inner wall is thicker than that of the second tapered inner wall 12. The taper angle of the first tapered inner wall 11 is smaller than that of the second tapered inner wall 12. If the first tapered inner wall 11 is ground first and then the second tapered inner wall 12 is ground, burrs 41 are likely to appear on the joint surface between the second tapered inner wall 12 and the first tapered inner wall 11, and there is pressure sintering deformation. Although there is an allowance, grinding the joint surface multiple times is likely to grind the first tapered inner wall 11 or the second tapered inner wall 12, resulting in a decrease in the quality of the first tapered inner wall 11 and the second tapered inner wall 12. Therefore, when the second tapered inner wall 12 is first calcined and formed by a mold and then the first tapered inner wall 11 is ground, it not only reduces the difficulty of manufacturing the inner wall of the blade 1, but also improves the processing efficiency of the blade, and also ensures the quality of different tapered inner walls of the inner wall of the blade 1. The taper of the first tapered inner wall is greater than that of the second tapered inner wall, which can also facilitate the tool to retract from the second tapered inner wall when manufacturing the first tapered inner wall, avoiding the tool from touching and wearing the second tapered inner wall.

[0059] Specifically, it is different from the existing method for processing the inner wall blade. Grind the first cylindrical inner wall along the edge direction at the top of the second conical inner wall 12 to form a preliminary conical inner wall. At this time, if it is determined that the conical inner wall meets all items in the first judgment condition, a standard first conical inner wall 11 is processed. That is, even if the preliminary conical inner wall undergoes a certain degree of deformation, the excess allowance can be removed by grinding, ensuring that the finished size of the entire blade inner wall 1 meets the standard size. Among them, the first judgment condition includes that the preliminary conical inner wall has not deformed, the included angle between the extension line of the top of the preliminary conical inner wall and the top of the blade conical wall is the first included angle, and the cone angle of the preliminary conical inner wall is 3° - 15°; if any item in the first judgment condition is not met, it is a mismatch. The first included angle is θ, and 123° ≤ θ ≤ 155°.

[0060] Beneficial effects of this embodiment

[0061] It is different from the existing processing method for the inner wall scraper in the prior art. For the inner wall scraper disclosed in the prior art, its blade inner wall is in a cylindrical structure, and the blade inner wall and the chip removal inlet are at a right angle. The processing of such a blade inner wall is less difficult and the rejection rate is low. Compared with the inner wall scraper disclosed in the aforementioned prior art, the blade inner wall for processing the inner wall scraper described in Embodiment 1 has an inner wall structure with multiple different tapers. For such a tapered blade inner wall, during the processing, if it is directly formed by pressure sintering, the inner wall is likely to deform, reducing the product quality and resulting in a higher rejection rate. On the other hand, after the blade inner wall has a tapered surface, the edge becomes sharper. The sharper edge increases the difficulty of grinding. Because as the sharpness of the edge increases, the phenomenon of edge chipping increases, leading to an increase in the rejection rate.

[0062] In order to improve the product quality and reduce the rejection rate, this embodiment provides a processing method for the inner wall scraper described in Embodiment 1, which is different from the existing processing method.

[0063] Specifically, first, in the use of a grinding tool, if the annular inner wall scraping tool blank is directly installed on the tool in the conventional manner of the prior art and the tool and the grinding wheel are kept axially parallel, it is impossible to machine the inner wall of the blade with multiple different tapers. Therefore, a collet chuck with a first taper needs to be installed on the chuck base to position the machining of the annular inner wall scraping tool. There is a certain angle between the axial direction of the inner hole of the tool and the axial direction of the grinding wheel, and this angle is the same as the taper angle of the first conical inner wall, so as to machine the inner wall of the blade with a taper. According to the thinking of those skilled in the art, the axial direction of the inner hole of the tool and the axial direction of the grinding wheel should be set parallel to produce a better inner wall of the blade. If there is a certain angle between the axial direction of the inner hole of the tool and the axial direction of the grinding wheel, it is difficult to ensure the dimensional structure of the inner wall of the blade. Therefore, by installing a collet chuck with a first taper on the chuck base, the problem of high machining difficulty of the inner wall of the blade with a taper can be initially solved.

[0064] Secondly, if the machining process of the inner wall of the blade provided in this embodiment is placed before machining the outer wall and the conical wall 2 of the blade, since there are multiple different tapers on the inner wall of the blade, it is difficult to position and grind the cutting edge of the conical wall of the blade, and it is easy to occur that after grinding the conical wall of the blade, the angle of the cutting edge is larger than the standard angle, that is, the cutting edge is not in a sharp structure. This not only fails to meet the quality requirement of a sharp cutting edge, but also increases the rejection rate. In the prior art, for the horizontal circular surface enclosed by the annular cutting edge and the inner wall are perpendicular. Generally, the conical wall of the blade is directly machined first, and then the inner wall of the blade is formed by feeding or direct pressure sintering. By taking the conical wall of the blade as the reference surface, the inner wall of the blade is machined to prevent the cutting edge from breaking during machining. In this embodiment, before grinding the conical wall of the blade, the second conical inner wall is formed by pressure sintering first, and then the plane connected to the second conical inner wall is used as the first grinding reference surface to grind out the light-transmitting inner through-hole. Based on the top light transmission of the light-transmitting inner through-hole as the reference, the conical wall of the blade is ground, so that the target size of the conical wall of the blade can be ground accurately at one time. This not only facilitates the grinding of the conical wall of the blade, speeds up the grinding efficiency of the conical wall of the blade, but also enables the outer surface of the annular inner wall scraping tool blank to be ground into a standard size structure of the conical wall of the blade faster and with higher quality. The last process is to grind the light-transmitting inner through-hole to form the first conical inner wall. This not only reduces the machining difficulty, but also improves the machining efficiency, and ensures the structural quality of the conical wall and the inner wall of the blade, as well as the sharpness of the cutting edge, thereby reducing the rejection rate of producing this kind of inner wall scraping tool.

[0065] Next, form a first cylindrical inner wall with a surplus for the surface contour corresponding to the light-transmitting inner through-hole, and the size of the surplus is determined according to the diameter of the blade taper wall. When the diameter of the blade taper wall is large, a larger surplus is required because it is easier for the large-diameter blade taper wall to accumulate machining errors to reduce the rejection rate; when the diameter of the blade taper wall is small, a smaller surplus is used because it is easier for the small-diameter blade taper wall to maintain high machining accuracy, and less material needs to be removed, resulting in a faster machining speed.

[0066] Finally, the taper of the second conical inner wall is greater than that of the first conical inner wall. This can also facilitate the retraction of the cutting tool used for machining from the second conical inner wall when making the first conical inner wall, avoiding the tool from touching and wearing the second conical inner wall, and ensuring the quality of the inner wall blade during machining.

[0067] This embodiment is briefly described, and for details, reference can be made to the foregoing embodiments.

[0068] Embodiment Three

[0069] This embodiment provides a deburring 41 tool using an inner wall scraper, which is applied to an inner wall scraper in Embodiment One. As Figure 4 and Figure 5 shown, the tool bar 3 is provided with a first installation position and a second installation position, and a chip discharge main pipe is also provided. Both the first installation position and the second installation position are located on the tool head. The first installation position and the second installation position are respectively equipped with a first blade 5 and a second blade 6. The first blade 5 and the second blade 6 are used to remove the inner wall burrs 41 of the welded pipe 4 simultaneously; the first blade 5 and the second blade 6 are a kind of inner wall scraper, and the deburring 41 tool using the inner wall scraper forms a double-blade deburring 41 structure; the inner walls 1 of the first blade 5 and the second blade 6 are both connected to the chip discharge main pipe. The overhang length of the tool head is related to the first installation position and the second installation position. That is, originally the tool bar had only one installation position, and now after adding one more installation position, the overhang length of the tool head is increased. The overhang length of the tool head is equivalent to the chip removal distance between the first blade 5 and the second blade 6.

[0070] As Figure 6 shown, the central axis of the first blade 5 forms a first chip removal angle γ with the axis of the welded pipe 4, and the central axis of the second blade 6 forms a second chip removal angle λ with the axis of the welded pipe 4. The first chip removal angle is different from the second chip removal angle. In this embodiment, 15° ≤ γ ≤ 30°, 15° ≤ β ≤ 30°.

[0071] As Figure 7 shown, there is a chip removal distance a between the first blade 5 and the second blade 6. 10 mm ≤ a ≤ 150 mm.

[0072] As Figure 8As shown, the exposed height of the first blade 5 relative to the second blade 6 is a first value; the first value is b, 1mm≤b≤10mm.

[0073] The beneficial effects of this embodiment

[0074] In the prior art, a single-blade deburring tool is usually used, while this solution creatively proposes a double-blade deburring structure and cleverly designs the installation method of the blade and the tool rod and the connection method of the chip removal channel. This structural design is not a conventional choice for those skilled in the art, because in the traditional design concept, increasing the number of blades may lead to problems such as reduced tool strength and difficulty in ensuring processing accuracy. However, this embodiment three successfully overcomes these potential problems through reasonable design and optimization, and realizes efficient and stable operation of the double-blade deburring tool.

[0075] Specifically, first of all, the reasonable layout of the first blade and the second blade, such as the chip spacing, exposed height and chip angle, as well as the effective connection with the chip removal main pipe, enables the burrs to be discharged more smoothly during the deburring process, reducing the accumulation and blockage of burrs on the inner wall of the blade. This not only avoids the risk of tool damage caused by burr blockage, but also reduces the vibration and wear of the tool during the processing process, effectively extending the service life of the tool, and reducing the frequency of tool replacement and production costs. At the same time, the double-blade structure can better disperse the force during processing, improve the overall stability of the tool, and ensure the smooth progress of the processing process.

[0076] At the same time, the double blades can scrape the inner wall of the welded pipe more comprehensively and evenly, reducing the burr residue caused by the dead angle or uneven scraping that may exist in single-blade processing, thereby significantly improving the processing quality and consistency of the inner wall of the welded pipe. This helps to meet the strict requirements for the inner wall quality of precision welded pipes in high-end application fields such as aerospace and automobile manufacturing, and reduce the product defective rate and subsequent processing costs caused by processing quality problems.

[0077] Finally, each additional mounting position on the tool bar 3 will increase the overhang length of the cutter head, and the bottom design of the first and second mounting positions will try to remove the material at the bottom of the mounting position to increase the chip removal space, so as to form a chip removal main pipe and maximize the chip removal space. Therefore, the overhang length increases, and a large amount of material will be removed from the lower part of the tool head overhang rod, which will cause the strength of the overhang rod tool head to decrease. In order to ensure the strength of the tool head at the overhang rod position, the material of the tool bar 3 needs to be high-strength alloy steel to ensure the strength of the overhanging part and avoid the burr 41 knife from being hit due to insufficient strength during the scraping process. At the same time, the overhang length is shortened as much as possible in the design, and while ensuring the strength, the space of the chip removal main pipe is expanded as much as possible to better remove chips.

[0078] This embodiment is briefly described. For details, reference can be made to the foregoing embodiments.

[0079] Test Example 1

[0080] A comparative test was conducted on an inner wall scraper provided in Embodiment 1. In this test, another inner wall scraper was provided. For convenience of distinction, this other inner wall scraper is simply referred to as the comparative inner wall scraper, and the inner wall scraper provided in Embodiment 1 is simply referred to as the test inner wall scraper. The difference between the comparative inner wall scraper and the test inner wall scraper is that although both inner wall scrapers are for making the cutting edge sharper, their modifications are different. As Figure 9 shown, in the comparative inner wall scraper, the inner wall of the blade is not improved. Still, according to the prior art, the inner wall of the blade is perpendicular to the chip removal inlet, and the upper part of the inner wall of the blade has a chip removal channel in a cylindrical structure. The improvement point of the comparative inner wall scraper is to directly reduce the angle δ between the cutting edge and the inner wall of the blade, as Figure 9 shown by the dotted line in, so as to make the cutting edge sharper and form a sharp edge at the cutting edge; as Figure 10 shown, after reducing the angle δ between the cutting edge and the inner wall of the blade, a sharp edge is formed at the cutting edge. In the production of the comparative inner wall scraper, it is also similar to the processing steps of ordinary and existing inner wall scrapers, that is, first the inner wall of the blade is processed, and then the tapered wall of the blade is processed. As Figure 1 shown, an inner wall scraper of the prior art is also provided in this test example. In this test example, the inner wall scraper of the prior art is referred to as the existing inner wall scraper.

[0081] In this test, by the method of controlling variables, the cutting edges of the comparative inner wall scraper and the test inner wall scraper were both processed into the same sharp edge. Three different types of inner wall scrapers, namely the existing inner wall scraper, the comparative inner wall scraper, and the test inner wall scraper, were used to deburr 10 identical and batch-produced pipes to be processed, and test results were obtained.

[0082] Table 1 Comparative test results of three different inner wall scrapers

[0083]

[0084] The service life in Table 1 refers to the situation where the cutting edges of different types of inner wall scrapers will break after scraping off the burrs in a certain number of pipes to be processed on average. The time taken to complete the experiment in Table 1 refers to the time taken for different types of inner wall scrapers to complete 20 pipes to be processed respectively when the number of blockages is more.

[0085] As shown in Table 1, it can be seen that compared with the existing inner wall scrapers, the other two types of inner wall scrapers have better burr scraping effects, and the scratches inside the welded pipes are relatively slight, meeting the surface quality requirements for the weld scraping of precision welded pipes. At the same time, the cutting edges of the other two types of inner wall scrapers are sharper, and the time taken to complete the test is shorter, thus reducing the processing speed.

[0086] Compared with the comparison inner wall scraper where the chip removal amount of the cross-sectional area of the inner wall of the blade does not change with the reduction of the angle δ between the cutting edge and the inner wall of the blade, it is difficult for the inner wall of the blade of the test inner wall scraper to become blocked, which improves the deburring speed of the inner wall scraper, thus increasing the processing speed. Moreover, it will not get stuck with chips and cause the cutting edge to break, improving the service life.

[0087] Test Example Two

[0088] A test was conducted on an inner wall scraper provided in Example 1. In this test, in the same test group, there were 10 inner wall scrapers with the first conical inner wall 11 of the same cone angle, and multiple test welded pipes, and the angle δ between the cutting edge and the inner wall of the blade was 48°. As shown in Table 2, the description of the scraping forming situation is the mode of the scraping forming situations of all the inner wall scrapers in the same group. The description of the weld surface quality is the mode of the weld surface qualities of all the inner wall scrapers in the same group. The description of the average number of uses of the inner wall scraper is the number of test welded pipes scraped accumulatively by each inner wall scraper in the same group from the start of use to damage. The number of test welded pipes in a group is added up and then averaged to obtain the average number of uses of the inner wall scraper. The number of test welded pipes refers to the successful removal of burrs 41 from the test welded pipes and meeting the requirements of precision welded pipes 4.

[0089] The test results of the inner wall scraper are as follows:

[0090] In Test Group 1, the angle θ between the inner wall 1 of the blade and the cutting edge 211 was 132°. The cone angle α of the first conical inner wall 11 was 0°. The scraping forming situation was: when the scraping of the first test welded pipe 4 ended and the scraping of the second test welded pipe 4 started, the surface finish of the chip decreased and slight burrs 41 were generated. The weld surface quality was: when the second test welded pipe 4 was scraped to the end, slight linear marks appeared and the blade could not be used continuously. The average number of uses of the inner wall scraper was 2 times.

[0091] In Test Group 2, the angle θ between the inner wall 1 of the blade and the cutting edge 211 was 134°. The cone angle α of the first conical inner wall 11 was 2°. The scraping forming situation was: when the scraping of the second test welded pipe 4 ended and the scraping of the third test welded pipe 4 started, the surface finish of the chip decreased and slight burrs 41 were generated. The weld surface quality was: when the third test welded pipe 4 was scraped to half, slight linear marks appeared on the weld surface and the blade could not be used continuously. The average number of uses of the inner wall scraper was 2.5 times.

[0092] For the third test group, the angle θ between the inner wall 1 of the blade and the cutting edge 211 is 135°. The taper angle α of the first conical inner wall 11 is 3°. The scraping forming situation is as follows: When the scraping of the second test welded pipe 4 ends and the scraping of the third test welded pipe 4 starts, the surface finish of the chip decreases, and slight burrs 41 are generated. The surface quality of the weld seam is that when the third test welded pipe 4 is scraped to half, slight linear marks appear on the weld seam surface, and the blade cannot be used continuously. The average number of times the inner wall scraper is used is 3 times.

[0093] For the fourth test group, the angle θ between the inner wall 1 of the blade and the cutting edge 211 is 138°. The taper angle α of the first conical inner wall 11 is 5°. The scraping forming situation is as follows: When the scraping of the third test welded pipe 4 ends and the scraping of the fourth test welded pipe 4 starts, the surface finish of the chip decreases, and slight burrs 41 are generated. The surface quality of the weld seam is that when the fourth test welded pipe 4 is scraped to the end, slight linear marks appear, and the blade cannot be used continuously. The average number of times the inner wall scraper is used is 4 times.

[0094] For the fifth test group, the angle θ between the inner wall 1 of the blade and the cutting edge 211 is 141°. The taper angle α of the first conical inner wall 11 is 8°. The scraping forming situation is as follows: When the scraping of the second test welded pipe 4 ends and the third test welded pipe 4 is processed to half, the surface finish of the chip decreases, and slight burrs 41 are generated. The surface quality of the weld seam is that when the third test welded pipe 4 is scraped to the end, slight linear marks appear, and the blade cannot be used continuously. The average number of times the inner wall scraper is used is 3 times.

[0095] For the sixth test group, the angle θ between the inner wall 1 of the blade and the cutting edge 211 is 145°. The taper angle α of the first conical inner wall 11 is 12°. The scraping forming situation is as follows: When the scraping of the second test welded pipe 4 ends and the third test welded pipe 4 is processed to half, the surface finish of the chip decreases, and slight burrs 41 are generated. The surface quality of the weld seam is that when the third test welded pipe 4 is scraped to the end, slight linear marks appear, and the blade cannot be used continuously. The average number of times the inner wall scraper is used is 2.8 times.

[0096] For the seventh test group, the angle θ between the inner wall 1 of the blade and the cutting edge 211 is 148°. The taper angle α of the first conical inner wall 11 is 15°. The scraping forming situation is as follows: When the scraping of the second test welded pipe 4 ends and the scraping of the third test welded pipe 4 starts, the surface finish of the chip decreases, and slight burrs 41 are generated. The surface quality of the weld seam is that when the third test welded pipe 4 is scraped to the end, slight linear marks appear, and the blade cannot be used continuously. The average number of times the inner wall scraper is used is 2.5 times.

[0097] In summary, when the average number of times the inner wall scraper is used is at least 3 times, then in the case of the taper angle α, the test of the inner wall scraper is successful. As shown in Table 1, when 3° ≤ α ≤ 15°, the deburring standard of precision welded pipes is achieved.

[0098] The above are only embodiments of the present invention, and common general technical solutions and / or characteristics in the solutions are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope claimed in this application shall be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. An inner wall scraper, comprising a blade cone wall, a blade inner wall and a blade edge formed by the top of the blade cone wall and the top of the blade inner wall, the blade edge is annular, the blade edge is used to contact the weld scar on the inner wall during the welding process of the welded pipe and scrape off the burrs therefrom, so that the burrs enter the blade inner wall through the chip removal entrance formed by the blade edge surrounding the ring, characterized in that: The angle between the top extension line of the inner wall of the blade and the top of the blade cone wall is a first angle, and the first angle is an obtuse angle; the longitudinal section angle of the cutting edge is complementary to the first angle, and the cutting edge forms a sharp edge; The inner wall of the blade is provided with a chip removal channel in a tapered hole structure for burrs to pass through, and the chip removal channel includes a first tapered inner wall whose top end is connected to the cutting edge and a second tapered inner wall connected to the first tapered inner wall; The extension lines of the bottom conical surfaces of the first conical inner wall and the second conical inner wall both extend toward the conical wall of the blade; the conical angle of the first conical inner wall is smaller than the conical angle of the second conical inner wall; the first conical inner wall extends downward along the cutting edge and surrounds its surrounding surface to form a first conical chip removal channel; the second conical inner wall extends downward along the end of the first conical tube and surrounds the surrounding surface of the second conical inner wall to form a second conical chip removal channel; the cross-sectional area of ​​the second conical chip removal channel is greater than or equal to the cross-sectional area of ​​the first conical chip removal channel; the first conical chip removal channel and the second conical chip removal channel are connected to each other to form a continuous chip removal channel; The cone angle of the first cone inner wall is 3°-15°.

2. An inner wall scraper according to claim 1, characterized in that: The first angle is 123°-155°.

3. An inner wall scraper according to claim 2, characterized in that: The ratio of the length of the first tapered inner wall to the length of the second tapered inner wall is in the range of 0.3-1.

4. An inner wall scraper according to claim 1, characterized in that: The cone angle of the second cone inner wall is 5°-25°.

5. A method for processing an inner wall scraper, characterized in that: Processing the annular scraper blank into an inner wall scraper product as claimed in any one of claims 1 to 4 comprises: S1, pressing and sintering the annular scraper blank to form an annular scraper blank, wherein the annular scraper blank has an inner hole, and the inner hole consists of a first section of inner hole and a second tapered hole sequentially connected from the cutting edge downward; wherein the first section of the inner hole has no taper and its hole wall line is perpendicular to the bottom surface of the annular scraper blank, and the inner wall of the second tapered hole is a second tapered inner wall, and the taper of the second tapered hole is 5°-25°; S2, clamping the scraper blank with the outer cylindrical surface of the annular scraper blank as the installation reference, grinding a smooth through hole along the first section of the inner hole to form a first tapered inner wall blank; then grinding the bottom surface of the blade with a grinding wheel to make it smooth and shiny to form a second annular scraper blank; S3, grinding the outer circumferential surface of the blade blank, taking the light-transmitting inner through hole as a positioning reference, grinding the outer wall of the second annular scraper blank along the outer wall connected with the top of the light-transmitting inner through hole, to form a third annular scraper blank with a blade cone wall; S4, grinding the first cylindrical inner wall according to the margin to form a preliminary tapered inner wall; S5, comparing the structures of the preliminary tapered inner wall and the first tapered inner wall according to the first judgment condition to see whether they match, if not, grinding the preliminary tapered inner wall again according to the remaining margin; if they match, forming an inner wall scraper product; Among them, the first judgment condition includes that the initial conical inner wall has not been deformed, the angle between the top extension line of the initial conical inner wall and the top of the blade cone wall is the first angle, and the cone angle of the initial conical inner wall is 3°-15°; if any one of the first judgment conditions is not met, it is a mismatch.

6. The method for processing an inner wall scraper according to claim 5, characterized in that: When the diameter of the blade cone wall is less than 22mm, the margin is 0.2mm; The diameter of the blade cone wall is not less than 22mm, and the margin is 0.2mm-0.4mm.

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