Inner wall scraper and machining method thereof

Abstract

The invention relates to the technical field of welded pipe burr removal, and discloses an inner wall scraper and a machining method thereof.The inner wall scraper comprises a blade conical wall, a blade inner wall and a cutting edge formed by the joint of the top of the blade conical wall and the top end of the blade inner wall, the cutting edge is annularly arranged, and the cutting edge is used for making contact with craters on the inner wall in the welded pipe welding process; the burrs enter the inner wall of the blade through a chip removal inlet formed by annularly surrounding 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 conical wall of the blade is a first included angle, and the first included angle is an obtuse angle; the included angle of the longitudinal section of the cutting edge is complementary with 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 which is used for burrs to pass through and is of a conical hole-shaped structure. According to the invention, the sharpness of the cutting edge is improved.

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 front cutting surface on the blade cone wall is a blade, and the blade edge is arranged in a ring shape. The blade edge is used to contact the weld scar on the inner wall of the welded pipe to be processed and scrape off the burrs therefrom, so that the burrs enter the inner wall of the blade through the chip removal entrance formed by the blade edge ring. The inner wall of the blade is perpendicular to the closed circular plane formed by the chip removal entrance, and the upper part of the inner wall of the blade is a chip removal channel of a cylindrical structure. The inner wall of the blade is used to guide the burrs out, but such a blade edge itself has a large angle, which makes the blade edge itself relatively dull, not only the deburring efficiency is low, but also the single deburring rate is low. When encountering larger burrs, larger burr chips are likely to enter the inner wall of the blade, and such larger burr chips will cause the inner wall of the blade to have poor chip removal, causing the inner wall of the blade to be blocked. This not only has a low deburring efficiency, but also the chip jamming easily causes the blade edge to break, reducing the service life of the blade. Summary of the invention

[0006] The present invention aims to provide an inner wall scraper and a processing method thereof, which solves the problem of poor drainage of the inner wall of the blade, improves the sharpness of the inner wall of the blade, and prolongs the service life of the scraper.

[0007] In order to achieve the above object, the present invention adopts the following technical scheme: The first scheme: an inner wall scraper and a processing method thereof, comprising a blade cone wall, a blade inner wall and a blade edge formed by the connection between 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 burrs therefrom, so that the burrs enter the blade inner wall through a chip removal entrance formed by the ring-shaped surrounding of the blade edge, the angle between the top extension line of the blade inner wall 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 blade edge is complementary to the first angle, and the blade edge forms a sharp edge; the blade inner wall is provided with a chip removal channel with a conical hole structure for the burrs to pass through, and the chip removal channel includes a top and a blade edge A first conical inner wall connected to the blade and a second conical inner wall connected to the first conical inner wall; the extension lines of the bottom cone surfaces of the first conical inner wall and the second conical inner wall both extend toward the blade cone 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 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.

[0008] The principle and advantage of this scheme are: different from the structure of the prior art, in actual application, by setting the inner wall of the blade in a plurality of combined conical structures, the angle between the top extension line of the inner wall of the blade and the top of the blade cone wall is an obtuse angle, so that the angle of the cutting edge itself is smaller, the cutting edge becomes sharper, and the cutting edge forms a sharp edge. A sharper cutting edge not only makes it easier to scrape off burrs, but also the amount of burrs scraped off in a short time is large. If the amount of burrs entering the inner wall of the blade in a short time is large, it is easy for burrs to block the inner wall of the blade; and at the same time, the inner wall of the blade with a conical structure can further increase the chip removal amount, avoiding the phenomenon that more burrs are scraped off in a short time after the blade is sharp, causing burrs to block the inner wall of the blade, thereby preventing the burr blockage from easily breaking the cutting edge and increasing the service life of the inner wall scraper.

[0009] Specifically, first, the angle between the top extension line of the inner wall of the blade and the top of the blade cone wall is the first angle, and the first angle is an obtuse angle. The cutting edge forms a sharp edge, so that the angle of the cutting edge itself is smaller, so as to improve the sharpness of the cutting edge, and can contact the inner wall of the welded pipe to be processed and can remove the burrs on the inner wall of the welded pipe at one time and almost completely. 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.

[0010] 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, and the extension lines of the bottom cone surfaces of both extend toward the cone wall of the blade. This increases the chip removal amount per unit area of ​​the cross-section of the inner wall of the blade, increases the volume of the inner wall of the blade, avoids the phenomenon of cutting edge chipping caused by chip jamming, and increases the service life of the blade.

[0011] In addition, the first conical inner wall extends downward along the cutting edge and surrounds the surrounding surface to form a first conical chip removal channel, and a second conical chip removal channel is formed along 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 second conical chip removal channel has a large chip removal space, so that the chip removal from the inner wall of the blade is smooth, avoiding the phenomenon of cutting edge chipping caused by chip jamming, and improving the service life of the blade.

[0012] Next, the taper of the first conical inner wall is smaller than the taper of the second conical inner wall. This makes it easier for the grinding tool to withdraw from the second conical chip removal channel formed by the second conical inner wall when machining and grinding the first conical inner wall, thereby preventing the tool used to machine the first conical inner wall from touching and wearing the second conical inner wall.

[0013] While increasing the sharpness of the inner wall scraper blade, it also increases the volume of the inner wall of the blade, avoiding the phenomenon of blade edge collapse caused by chip blockage, and increasing the service life of the blade. In actual processing and production, one inner wall scraper can be used to complete the scraping of multiple welded pipes in a batch, while reducing production and processing costs, and ensuring the stability of the processing quality of multiple welded pipes in the same batch.

[0014] Finally, the prior art does not enclose the circular plane formed by the annular setting of the inner wall of the blade and the cutting edge, that is, the chip removal entrance is not tangentially set. This is because when processing the first cone wall, the axial direction of the conventional inner 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 at a vertical angle to the blade. Once the angle between the inner wall of the blade and the cutting edge is an obtuse angle, the inner hole grinding wheel needs to be adjusted. Ordinary technicians believe that this requires the modification or even adjustment of the inner hole grinding wheel so that the axial direction of the inner hole grinding wheel and the axial direction of the inner wall of the scraper remain parallel, and the modification is difficult. By improving the inner wall of the blade, this solution can increase the chip removal while improving the sharpness of the cutting edge, avoid the phenomenon of burr congestion, and increase the service life of the blade.

[0015] Preferably, the cone angle of the first conical inner wall is 3°-15°.

[0016] Beneficial effect: When the cone angle of the first conical inner wall is less than 3°, it cannot improve the chip removal space; when the cone angle of the first conical inner wall is greater than 15°, it cannot support the blade, and the blade is easily damaged after multiple scraping. Only when the cone angle of the first conical inner wall is 3°-15°, it can support the blade and improve the chip removal space. Preferably, the first angle is 123°-155°.

[0017] Beneficial effect: When the first angle is 155°, the angle of the cutting edge itself is minimized, and the cutting edge forms a sharp edge, which greatly improves the sharpness of the cutting edge and can almost completely remove burrs on the inner wall of the welded pipe at one time.

[0018] Preferably, 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.

[0019] Beneficial effect: The length of the first tapered inner wall is less than or equal to the length of the second tapered inner wall. When the ratio of the length of the first tapered inner wall to the second tapered inner wall is greater than 1, the chip removal space is reduced; when the ratio of the length of the first tapered inner wall to the second tapered inner wall is less than 0.3, the support effect on the blade is poor; therefore, when the ratio of the length of the first tapered inner wall to the second tapered inner wall is 0.3-1, the chip removal space can be increased and the blade edge can be better supported.

[0020] The second scheme: A processing method for an inner wall scraper, used for processing an annular scraper blank into an inner wall scraper product as described in the first scheme, comprising: S1, pressing and sintering the annular scraper blank to form an annular scraper blank, the annular scraper blank having an inner hole, the inner hole consisting of a first section of inner hole and a second tapered hole connected in sequence 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, 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 of the annular scraper blank with the outer cylindrical surface of the 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 blade roughness The outer cylindrical surface of the blank is positioned with the light-transmitting inner through hole as the reference, and the outer wall of the second annular scraper blank is ground 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 conical inner wall; S5, comparing whether the structure of the preliminary conical inner wall matches that of the first conical inner wall according to the first judgment condition, if not, grinding the preliminary conical inner wall again according to the remaining margin; if matching, forming an inner wall scraper product; wherein the first judgment condition includes that the preliminary conical inner wall has not been deformed, the angle between the top extension line of the preliminary conical inner wall and the top of the blade cone wall is the first angle, and the cone angle of the preliminary conical inner wall is 3°-15°; if any one of the first judgment conditions is not met, it is considered as mismatch.

[0021] Beneficial effect: the second conical inner wall is first pressed and sintered into shape, then the blade cone wall is ground, and finally the second conical inner wall is ground, so that a fine inner wall scraper can be produced, and the yield of the inner wall scraper is improved, and the production cost is reduced.

[0022] Preferably, when the diameter of the blade cone wall is less than 22 mm, the margin is 0.2 mm; when the diameter of the blade cone wall is not less than 22 mm, the margin is 0.2 mm-0.4 mm.

[0023] Beneficial effect: A margin is left according to different blade cone walls, so that when manufacturing the inner wall of the blade, an inner wall scraper closer to the inner wall of the standard blade can be obtained, thereby reducing the amount of waste generated when manufacturing the inner wall scraper, thereby reducing the manufacturing cost.

[0024] The third scheme: a deburring tool using an inner wall scraper, comprising a tool rod, a chip removal main pipe is opened on the tool rod, and an inner wall scraper used in the first scheme; a first mounting position and a second mounting position are provided on the tool rod, and a first blade and a second blade are respectively installed in the first mounting position and the second mounting position, and the first blade and the second blade are used to simultaneously remove the inner wall burrs of the weld pipe; the first blade and the second blade are an inner wall scraper, and the deburring tool using the inner wall scraper forms a double-blade deburring structure; a chip spacing 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 angle with the axis of the weld pipe, and the central axis of the second blade forms a second chip angle with the axis of the weld pipe, and the chip removal channels formed on the inner walls of the first blade and the second blade are both connected to the chip removal main pipe.

[0025] Beneficial effect: The deburring tool using the inner wall scraper is provided with a first blade and a second blade, and the first blade and the second blade are used to remove the burrs on the inner wall of the welded pipe at the same time, so as to achieve the effect of removing the burrs on the inner wall of the welded pipe in one go and completely, and the burrs are removed quickly without causing scratches to the welded pipe.

[0026] Preferably, the first chip angle is 15°-35°; the second chip angle is 15°-35°.

[0027] Beneficial effects: First, by setting the first chip angle and the second chip angle of the two first blades and the second blade, when the chip angle is in the range of 15°-35°, the contact angle between the blade and the inner wall of the weld pipe is relatively reasonable, which enables the blade to cut into the burrs on the inner wall of the weld pipe more smoothly during the scraping process, thereby scraping off more burrs per unit time, significantly improving the efficiency of deburring, reducing processing time, and improving production efficiency. Secondly, the chip angle within this angle range is conducive to controlling the amount and effect of burr removal, avoiding incomplete burr removal or excessive scraping of the inner wall of the weld pipe due to an angle that is too large or too small, thereby ensuring the surface quality of the inner wall of the weld pipe, meeting the strict requirements of precision welded pipes for the surface quality after weld scraping, and reducing the defective rate caused by processing defects.

[0028] Preferably, the first value is 1 mm-10 mm.

[0029] Beneficial effects: First, the first value is within the range of 1mm-10mm, which can enable the first blade and the second blade to form a reasonable cutting layer during the scraping process. The first blade first performs preliminary scraping of the burrs on the inner wall of the welded pipe to remove most of the burrs; then the second blade performs fine scraping of the remaining small amount of burrs to further improve the smoothness of the inner wall of the welded pipe. This layered 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 of precision welded pipes on the inner wall quality. Appropriate exposure height helps to maintain the stability of the tool during the scraping process. Excessive exposure height may cause the tool to produce greater vibration during high-speed rotation or reciprocating motion, affecting the scraping accuracy and tool life; while too small exposure height may cause uneven force on the tool during scraping, causing the tool to swing or jump. The exposure height range of 1mm-10mm can effectively control the vibration and swing of the tool while ensuring the scraping effect, so that the tool runs more smoothly during the processing process, improving the reliability of the processing process and the service life of the tool. Finally, in actual production, according to different processing conditions and welded pipe conditions, it may be necessary to fine-tune the exposed height of the tool. The range of 1mm-10mm 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A cross-sectional view of an inner wall scraper of the prior art; Figure 2 (a) is a cross-sectional view of the inner wall scraper of Example 1; Figure 3 (b) is a cross-sectional view of the inner wall scraper of Example 1; Figure 4 A schematic structural diagram of a deburring tool using an inner wall scraper according to Embodiment 3 (a); Figure 5 A schematic structural diagram of a deburring tool using an inner wall scraper according to Embodiment 3 (b); Figure 6 A schematic structural diagram of a deburring tool using an inner wall scraper according to Embodiment 3 (c); Figure 7 A schematic structural diagram of a deburring tool using an inner wall scraper according to Embodiment 3 (d); Figure 8 A schematic structural diagram of a deburring tool using an inner wall scraper according to Embodiment 3 (e); Fig. 9 (a) is a cross-sectional view of the comparative inner wall scraper of Test 1; Fig.10 (b) is a cross-sectional view of the comparative inner wall scraper of Experiment 1.

[0031] The reference numerals in the drawings of the specification include: Blade inner wall 1, blade cone wall 2, tool rod 3, welding pipe 4, first blade 5, second blade 6, first cone inner wall 11, second cone inner wall 12, first cone chip removal channel 13, second cone chip removal channel 14, blade 21, burr 41, cutting edge 211, chip removal inlet 212. DETAILED DESCRIPTION

[0032] Embodiment 1 like Figure 2 and Figure 3 As shown, this embodiment provides an inner wall scraper, comprising a blade cone wall 2, a blade inner wall 1, and a cutting edge 211 formed by the connection between the top of the blade cone wall 2 and the top of the blade inner wall 1, the cutting edge 211 is arranged in a ring shape, and the cutting edge 211 is used to contact the weld scar on the inner wall of the welded pipe 4 to be processed and scrape off the burr 41 therefrom, so that the burr 41 enters the blade inner wall 1 through a chip removal entrance 212 formed by the cutting edge 211 surrounding the inner wall 1 in a ring shape, and the angle between the top extension line of the blade inner wall 1 and the top of the blade cone wall 2 is a first angle, and the first angle is an obtuse angle; The longitudinal section angle of the cutting edge 211 is complementary to the first angle, and the cutting edge 211 forms a sharp edge; the inner wall 1 of the blade is provided with a chip removal channel in a conical hole structure for the burr 41 to pass through, and the chip removal channel includes a first conical inner wall 11 connected to the cutting edge 211 at the top and a second conical inner wall 12 connected to the first conical inner wall 11; the bottom end conical extension lines of the first conical inner wall 11 and the second conical inner wall 12 both extend toward the blade conical wall 2; the cone angle of the first conical inner wall 11 is smaller than the cone angle of the second conical inner wall 12, as shown in FIG. Figure 2 As shown, the dotted line in the middle of the figure is the dividing 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 211 to surround the surrounding surface to form a first tapered chip removal channel 13, and surrounds the end of the first tapered tube to form a second tapered chip removal channel 14. The first tapered tube is located above the dotted line, and the second tapered tube is located 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 constitute a chip removal channel.

[0033] Specifically, the blade inner wall 1 is a chip removal channel with a conical hole structure. The blade inner wall 1 includes a first conical inner wall 11 and a second conical inner wall 12. The first conical inner wall 11 and the second conical inner wall 12 are both in an "eight" shape, that is, the conical surface extension lines of the first conical inner wall 11 and the second conical inner wall 12 are both facing the blade conical wall 2. There is an angle between the first conical inner wall 11 and the second conical inner wall 12, and it can be an obtuse angle. Figure 3As shown, when the outer contour of the blade 21 is projected onto the outer contour of the first conical inner wall 11, it is a figurative representation. At this time, a vertical shape is formed. The line of the outer contour projection mapping of the blade 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 blade 21. The first conical inner wall 11 is used to support the blade 21.

[0034] The cone angle of the first tapered inner wall 11 is α, 3°≤α≤15°, in this embodiment, α=15°. The cone angle of the second tapered inner wall 12 is β, 5°≤β≤25°. The ratio of the length of the first tapered inner wall 11 to the second tapered inner wall 12 is 0.3-1. The blade inner wall 1 and the cutting edge 211 form an angle θ, 123°≤θ≤155°.

[0035] Embodiment 2 This embodiment provides a method for processing an inner wall scraper, which is used to process an annular scraper blank into an inner wall scraper product as described in the first embodiment, comprising: S1, press-sintering the annular scraper blank to form an annular scraper blank, the annular scraper blank having an inner hole, the inner hole consisting 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, 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°.

[0036] Specifically, the annular scraper blank is pressed and sintered by using a mold, and the mold can be made according to the first inner hole and the second tapered hole of the annular scraper blank, and the mold is a conventional setting that is easy to use in the prior art of the field. The creativity lies in that the structure of the second tapered hole is the same as that of the second tapered inner wall, which is convenient for not only feeding and retracting the knife when the first tapered inner wall is subsequently made, but also can accelerate the processing efficiency of the inner wall scraper by directly calcining and forming the mold.

[0037] In the preparation stage of the first conical inner wall grinding, the annular preliminary scraper blank is installed on the grinding tool, which includes a tool, an inner hole grinding wheel for grinding the annular preliminary scraper blank, a spring chuck fixture, a chuck base for clamping the tool, a fixture for clamping the annular scraper blank, and a three-jaw chuck; the spring chuck fixture is installed on the three-jaw chuck, and is used to position and grind the outer surface of the annular preliminary scraper blank; the spring chuck fixture is fixed with the annular preliminary scraper blank, and the tool is installed on the spring chuck fixture, and the first conical inner wall is ground by rotating the inner hole grinding wheel. The axial direction of the annular preliminary scraper blank and the axial direction of the inner hole grinding wheel are parallel. In this embodiment, the bottom surface of the preliminary scraper blank is close to the formed second conical inner wall.

[0038] 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; wherein the surface contour of the first tapered 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 tapered hole, and the difference between the minimum radius of the first cylindrical inner wall and the second tapered hole is the margin; the ratio of the length of the second tapered hole to the smooth through hole is 0.3-1.

[0039] Specifically, the difference from the existing processing method for the inner wall of the scraper can also be reflected in the different processing steps. When making the existing scraper inner wall, the process of grinding the blade inner wall 1 is placed before grinding the blade cone wall 2. This is because the existing blade inner wall 1 is a single cylindrical structure with a simple structure. It can be completed by one-time cutting or direct mold calcination, and the blade inner wall 1 needs to be transparent to grind the blade cone wall 2. Therefore, in the processing steps provided in this embodiment, if the processing of the first conical inner wall is placed before the processing of the blade cone wall 2, the blade inner wall 1 has formed a conical inner wall with different tapers, and it is difficult to locate the processing position of the unprocessed blade cone wall 2 blank. 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 that is not penetrated by the top of the first section of the inner hole. On this circular horizontal plane, the dot is used as the center as the point where the axis of the light-transmitting inner through hole passes through. The difference between the wall thickness of the finishing through hole and the wall thickness of the second conical inner wall is the margin. As Figure 3 As shown, when the diameter of the blade cone wall 2 is less than 22mm, the margin is 0.2mm; when the diameter of the blade cone wall 2 is not less than 22mm, the margin is 0.2mm-0.4mm. In this embodiment, the diameter of the blade cone wall 2 is the diameter of the blade cone wall 2 defined on the production drawing. By grinding out the light-transmitting inner through hole, the blade cone wall 2 that meets the standard size can be accurately ground based on the light-transmitting inner through hole.

[0040] S3, grinding the outer wall surface of the second annular scraper blank, taking the light-transmitting inner through hole as the 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.

[0041] Specifically, compared with the prior art that first makes the blade cone wall and then makes the blade inner wall based on the blade cone wall, this embodiment first presses and burns the second conical inner wall into shape through a mold, and then cuts out a light-transmitting inner through hole based on the circular plane close to the top of the second conical inner wall, and grinds the blade cone wall of the second annular scraper blank by using the light-transmitting inner through hole as a positioning reference. In this embodiment, the deflection angle of the three-jaw chuck and the angle of the blade cone wall 2 to be processed can be adjusted to be consistent to grind out the required blade cone wall 2. Those skilled in the art should be aware that the blade outer wall and the blade cone wall 2 are both the outer contours of the blade, and the difference is that the blade outer wall does not have a taper, while the blade cone wall 2 has a taper.

[0042] S4, grind the first cylindrical inner wall according to the margin to form a preliminary conical inner wall. S5, compare whether the structure of the preliminary conical inner wall matches that of the first conical inner wall according to the first judgment condition. If they do not match, grind the preliminary conical inner wall again according to the remaining margin; if they match, an inner wall scraper product is formed. Among them, the first judgment condition includes that the preliminary conical inner wall has not been deformed, the angle between the top extension line of the preliminary conical inner wall and the top of the blade cone wall is the first angle, and the cone angle of the preliminary conical inner wall is 3°-15°; if any one of the first judgment conditions is not met, it is a mismatch.

[0043] The thickness of the first cylindrical inner wall has a margin, which is equivalent to the thickness of the first cylindrical inner wall being thicker than the thickness of the second conical inner wall 12. The cone angle of the first conical inner wall 11 is smaller than the cone angle of the second conical inner wall 12. If the first conical inner wall 11 is ground first and then the second conical inner wall 12 is ground, the connection surface between the second conical inner wall 12 and the first conical inner wall 11 is prone to burrs 41 and pressure burning deformation. Although a margin is left, the connection surface is ground multiple times, and it is easy to grind the first conical inner wall 11 or the second conical inner wall 12, which reduces the quality of the first conical inner wall 11 and the second conical inner wall 12. Therefore, when the second conical inner wall 12 is first calcined and formed by a mold and then the first conical inner wall 11 is ground, it not only reduces the difficulty of making the blade inner wall 1, but also improves the processing efficiency of the blade, and also ensures the quality of the different conical inner walls of the blade inner wall 1. The taper of the first conical inner wall is greater than that of the second conical inner wall, which makes it easier for the tool to withdraw from the second conical inner wall when making the first conical inner wall, thereby preventing the tool from touching and wearing the second conical inner wall.

[0044] Specifically, unlike the existing method of processing the inner wall blade, the first cylindrical inner wall is ground along the cutting 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 judged that the conical inner wall meets all the items in the first judgment condition, the standard first conical inner wall 11 is processed, that is, the preliminary conical inner wall produces a certain degree of deformation, and the excess excess can be removed by grinding to ensure 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 been deformed, the angle between the top extension line of the preliminary conical inner wall and the top of the blade cone wall is the first angle, and the cone angle of the preliminary conical inner wall is 3°-15°; if any one of the first judgment conditions is not met, it is mismatched. The first angle is θ, 123°≤θ≤155°.

[0045] The beneficial effects of this embodiment The processing method of the inner wall scraper is different from that in the prior art, because compared with the inner wall scraper disclosed in the prior art, the inner wall of the blade is a cylindrical structure, and the inner wall of the blade and the chip removal entrance are at a vertical angle. The processing difficulty of the inner wall of such a blade is relatively low, and the scrap rate is low. Compared with the inner wall scraper disclosed in the prior art, the inner wall of the blade used to process the inner wall scraper described in Example 1 has a variety of inner wall structures with different tapers. For such a tapered blade inner wall, if it is directly formed by press-burning during the processing, the inner wall will be easily deformed, which reduces the quality of the product and has a high scrap rate. On the other hand, after the inner wall of the blade has a tapered surface, the cutting edge becomes sharper, and the sharp cutting edge will increase the difficulty of grinding, because as the sharpness of the cutting edge increases, the phenomenon of chipping of the cutting edge will increase, resulting in an increase in the scrap rate.

[0046] In order to improve product quality and reduce scrap rate, this embodiment provides a processing method for the inner wall scraper described in Embodiment 1, which is different from the existing processing method.

[0047] Specifically, first, in the use of the grinding tool, if the annular inner wall scraper blank is directly installed on the tool as in the conventional means of the prior art, and the tool and the grinding wheel are kept parallel in axial direction, it is impossible to process the inner wall of the blade with a variety of different tapers. Therefore, it is necessary to install a spring chuck with a first taper on the chuck base to position the processing of the annular inner wall scraper. There is a certain angle between the axial direction of the inner hole of the tool and the axial direction of the grinding wheel. This angle is the same as the cone angle of the first conical inner wall to process 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 are set parallel to each other in order 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 size structure of the inner wall of the blade. Therefore, by installing a spring chuck with a first taper on the chuck base, the problem of the difficulty of processing the inner wall of the blade with a taper can be preliminarily solved.

[0048] Secondly, if the processing step of the inner wall of the blade provided in this embodiment is placed before processing the outer wall of the blade and the blade cone wall 2, it is difficult to position and grind the blade of the blade cone wall because there are multiple inner walls with different tapers on the inner wall of the blade. It is easy to appear that after grinding the blade cone wall, the angle of the cutting edge is larger than the standard angle, that is, the cutting edge is not sharp. This not only fails to meet the quality requirements of the sharp cutting edge, but also increases the scrap rate. In the prior art, for the horizontal circular surface enclosed and surrounded by the annular cutting edge and the inner wall, this is generally first directly processed to form the blade cone wall, and then the blade inner wall is formed by cutting or directly pressing and burning. The blade cone wall is used as the reference surface to process the blade inner wall, thereby preventing the blade from collapsing during processing. In this embodiment, before grinding the blade cone wall, the second conical inner wall is first formed by pressing and sintering, 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. The blade cone wall is ground based on the top light-transmitting inner through hole. In this way, the target size of the blade cone wall can be ground out at one time and accurately, which not only facilitates the grinding of the blade cone wall and speeds up the efficiency of grinding the blade cone wall, but also enables the outer surface of the annular inner wall scraper blank to grind the blade cone wall of standard size structure faster and with high quality. The last step is to grind the light-transmitting inner through hole to form the first conical inner wall, which not only reduces the processing difficulty, but also improves the processing efficiency, and also ensures the structural quality of the blade cone wall and the blade inner wall, as well as the sharpness of the cutting edge, thereby reducing the scrap rate of producing such inner wall scrapers.

[0049] Next, the surface contour corresponding to the light-transmitting inner through hole is formed into a first cylindrical inner wall with a margin, and the size of the margin is determined according to the diameter of the blade cone wall. When the diameter of the blade cone wall is large, a larger margin is required, because the large-diameter blade cone wall is more likely to accumulate processing errors, so as to reduce the scrap rate; when the diameter of the blade cone wall is small, a smaller margin is used, because the smaller diameter of the blade cone wall is easy to maintain a higher processing accuracy, and less material needs to be removed, and the processing speed is faster.

[0050] Finally, the taper of the second conical inner wall is greater than that of the first conical inner wall. This makes it easier for the tool used for processing to withdraw from the second conical inner wall when making the first conical inner wall, preventing the tool from touching and wearing the second conical inner wall, thereby ensuring the quality of the blade for processing the inner wall.

[0051] This embodiment is a brief description, and the details may refer to the aforementioned embodiments.

[0052] Embodiment 3 This embodiment provides a deburring tool 41 using an inner wall scraper, which is applied to an inner wall scraper of the first embodiment. Figure 4 and Figure 5 As shown, the tool bar 3 is provided with a first mounting position and a second mounting position, and is also provided with a chip removal main pipe. The first mounting position and the second mounting position are both located on the tool head, and the first mounting position and the second mounting position are respectively provided with a first blade 5 and a second blade 6, which are used to simultaneously remove the inner wall burrs 41 of the welding pipe 4; 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 removal main pipe. The overhang length of the tool head is related to the first mounting position and the second mounting position. That is, the original tool bar has only one mounting position, and now after adding one more mounting position, the overhang length of the tool head is increased, and the overhang length of the tool head is equivalent to the chip spacing between the first blade 5 and the second blade 6.

[0053] like Figure 6 As shown, the central axis of the first blade 5 forms a first chip angle γ with the axis of the weld pipe 4, and the central axis of the second blade 6 forms a second chip angle λ with the axis of the weld pipe 4, and the first chip angle is different from the second chip angle. In this embodiment, 15°≤γ≤30°, 15°≤β≤30°.

[0054] like Figure 7 As shown, a chip spacing a is provided between the first blade 5 and the second blade 6. 10mm≤a≤150mm.

[0055] like 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.

[0056] The beneficial effects of this embodiment 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] This embodiment is a brief description, and the details may refer to the aforementioned embodiments.

[0061] Test Example 1 A comparative test was conducted on an inner wall scraper provided in Example 1. In this test, another inner wall scraper was provided. For the convenience of distinction, the other inner wall scraper was referred to as the comparative inner wall scraper, and the inner wall scraper provided in Example 1 was 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 designed to make the blade sharper, the modifications of the two are different. Fig. 9 As shown in FIG. 1 , in the comparative inner wall scraper, the inner wall of the blade is not improved, and the inner wall of the blade is still perpendicular to the chip removal inlet according to the prior art, and the upper part of the inner wall of the blade is a cylindrical chip removal channel. The improvement of the comparative inner wall scraper is that the angle δ between the blade edge and the inner wall of the blade is directly reduced, such as Fig. 9 As shown by the dotted line in the middle, the cutting edge is sharper and has a sharp edge. Fig.10 As shown, by reducing the angle δ between the blade edge and the inner wall of the blade, the blade edge forms a sharp edge. In comparison with the production of the inner wall scraper, the processing steps are similar to those of the common and existing inner wall scrapers, which are to first process the inner wall of the blade and then process the blade cone wall. Figure 1 As shown, this test example also provides an inner wall scraper of the prior art. In this test example, the inner wall scraper of the prior art is referred to as the existing inner wall scraper.

[0062] In this test, the cutting edges of the comparison inner wall scraper and the test inner wall scraper were processed into the same sharp edges through the controlled variable method. Three different types of inner wall scrapers, namely the existing inner wall scraper, the comparison inner wall scraper and the test inner wall scraper, were used to deburr 10 welded pipes with the same structure and produced in the same batch to be processed, and the test results were obtained.

[0063] Table 1 Comparative test results of three different inner wall scrapers

[0064] The service life in Table 1 refers to the number of times different types of inner wall scrapers will break after scraping off a number of burrs in the welded pipe to be processed. The time required to complete the experiment in Table 1 refers to the time required for different types of inner wall scrapers to complete 20 welded pipes to be processed as the number of blockages increases.

[0065] As shown in Table 1, it can be seen that compared with the existing inner wall scraper, the other two types of inner wall scrapers have a good effect in scraping burrs, and the scratches in the welded pipe are relatively slight, which meets the surface quality requirements of precision welded pipes for weld scraping. At the same time, the other two types of inner wall scrapers have sharper edges, and the time taken to complete the test is shorter, thereby reducing the processing speed.

[0066] Compared with the comparison inner wall scraper in which the angle δ between the blade edge and the inner wall of the blade is reduced and the chip removal amount of the inner wall cross-sectional area of ​​the blade does not change, the inner wall of the blade of the experimental inner wall scraper is less likely to be blocked, which increases the deburring speed of the inner wall scraper, thereby increasing the processing speed, and does not cause chipping of the blade edge due to chip jamming, thereby increasing the service life.

[0067] Test Example 2 An inner wall scraper provided in Example 1 was tested. 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 blade and the inner wall of the blade was 48°. As shown in Table 2, the scraping forming conditions are expressed as the mode of the scraping forming conditions of all inner wall scrapers in the same group. The weld surface quality is expressed as the mode of the weld surface quality of all inner wall scrapers in the same group. The average number of uses of the inner wall scraper is expressed as the cumulative number of scraped test welded pipes scraped by each inner wall scraper in the same group from the beginning of use to damage, and the number of all scraped test welded pipes in a group is added and 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 the requirements of precision welded pipes 4 are met.

[0068] The test results of the inner wall scraper are as follows: The angle θ between the inner wall 1 and the cutting edge 211 of the blade of test group 1 is 132°. The cone angle α of the first tapered inner wall 11 is 0°. The scraping forming situation is as follows: when the first test welded pipe 4 is finished and the second test welded pipe 4 is scraped, the surface finish of the chip decreases and slight burrs 41 are generated. The surface quality of the weld is as follows: when the second test welded pipe 4 is scraped to the tail, slight line marks appear and the blade cannot be used any more. The average number of times the inner wall scraper is used is 2 times.

[0069] The angle θ between the inner wall 1 and the cutting edge 211 of the blade of the test group 2 is 134°. The cone angle α of the first conical inner wall 11 is 2°. The scraping forming situation is as follows: when the second test welded pipe 4 is finished and the third test welded pipe 4 is scraped, the surface finish of the chip decreases and slight burrs 41 are generated. The surface quality of the weld is as follows: when the third test welded pipe 4 is scraped halfway, slight line marks appear on the weld surface and the blade cannot be used any more. The average number of times the inner wall scraper is used is 2.5 times.

[0070] The angle θ between the inner wall 1 and the cutting edge 211 of the blade of the test group 3 is 135°. The cone angle α of the first conical inner wall 11 is 3°. The scraping forming situation is as follows: when the second test welded pipe 4 is finished and the third test welded pipe 4 is scraped, the surface finish of the chip decreases and slight burrs 41 are generated. The surface quality of the weld is that when the third test welded pipe 4 is scraped halfway, a slight line mark appears on the weld surface and the blade cannot be used any more. The average number of times the inner wall scraper is used is 3 times.

[0071] The angle θ between the inner wall 1 and the cutting edge 211 of the blade of test group 4 is 138°. The cone angle α of the first tapered inner wall 11 is 5°. The scraping forming situation is as follows: when the third test welded pipe 4 is finished and the fourth test welded pipe 4 is scraped, the surface finish of the chip decreases and slight burrs 41 are generated. The surface quality of the weld is as follows: when the fourth test welded pipe 4 is scraped to the tail, slight line marks appear and the blade cannot be used any more. The average number of times the inner wall scraper is used is 4 times.

[0072] The angle θ between the inner wall 1 and the cutting edge 211 of the blade of test group 5 is 141°. The cone angle α of the first tapered inner wall 11 is 8°. The scraping forming conditions are as follows: when the second test welded pipe 4 is finished and the third test welded pipe 4 is halfway processed, the surface finish of the chip decreases and slight burrs 41 are generated. The surface quality of the weld is as follows: when the third test welded pipe 4 is scraped to the tail, slight line marks appear and the blade cannot be used any more. The average number of times the inner wall scraper is used is 3 times.

[0073] The angle θ between the inner wall 1 and the cutting edge 211 of the blade of test group 6 is 145°. The cone angle α of the first tapered inner wall 11 is 12°. The scraping forming conditions are as follows: when the second test welded pipe 4 is finished and the third test welded pipe 4 is halfway processed, the surface finish of the chip decreases and slight burrs 41 are generated. The surface quality of the weld is as follows: when the third test welded pipe 4 is scraped to the tail, slight line marks appear and the blade cannot be used any more. The average number of times the inner wall scraper is used is 2.8 times.

[0074] The angle θ between the inner wall 1 and the cutting edge 211 of the blade of test group 7 is 148°. The cone angle α of the first tapered inner wall 11 is 15°. The scraping forming situation is as follows: when the second test welded pipe 4 is finished and the third test welded pipe 4 is scraped, the surface finish of the chip decreases and slight burrs 41 are generated. The surface quality of the weld is as follows: when the third test welded pipe 4 is scraped to the tail, slight line marks appear and the blade cannot be used any more. The average number of times the inner wall scraper is used is 2.5 times.

[0075] In summary, when the average number of times the inner wall scraper is used is at least 3 times, the test of the inner wall scraper is successful when the cone angle is α. As shown in Table 1, when 3°≤α≤15°, the deburring standard of the precision welded pipe is met.

[0076] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the technical solution of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records 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 cone surfaces of the first conical inner wall and the second conical inner wall both extend toward the cone wall of the blade; 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 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.

2. An inner wall scraper according to claim 1, characterized in that: The cone angle of the first cone inner wall is 3°-15°.

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

4. An inner wall scraper according to claim 3, 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.

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

6. 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 5 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.

7. The method for processing an inner wall scraper according to claim 6, 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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