Metal descaling nozzle with prefabricated wear-resistant curve and manufacturing method of metal descaling nozzle

Abstract

The invention discloses a metal descaling nozzle with a prefabricated wear-resistant curve and a manufacturing method of the metal descaling nozzle, and belongs to the technical field of metal rolling and heat treatment. In order to solve the problem that in the processes of high-pressure water descaling, cooling liquid spraying, high-pressure purging and the like, the invention provides a design strategy for prefabricating a wear-resistant curve, specifically, the corner angle of a spraying hole is subjected to structure optimization through multi-stage chamfering, and on the basis of improving the wear resistance, the wear resistance of the spraying hole is improved through accurate control over parameters; and the stability of the jet flow track in the using process is guaranteed. On one hand, the overall service life of the nozzle is prolonged by prefabricating an anti-wear curve, and the rolling mill shutdown maintenance frequency is effectively reduced; and on the other hand, the jet flow can still maintain extremely small track offset under high-pressure impact, the surface and cooling quality of the product is ensured, the method is suitable for scenes such as descaling, purging and heat treatment cooling after rolling, the production line efficiency and the product quality can be remarkably improved, and the method has good practical application value.

Description

Technical Field

[0001] The invention relates to the technical field of metal rolling and heat treatment, and in particular to a metal descaling nozzle with a prefabricated anti-wear curve and a manufacturing method thereof. Background Art

[0002] During the metal rolling and heat treatment process, the nozzle serves as a core component for high-pressure water descaling, coolant injection, and high-pressure purging. Its wear resistance and injection accuracy directly determine the surface quality of the product, cooling effect, and production line efficiency. Taking the high-pressure water descaling of hot-rolled steel plates as an example, traditional nozzles usually do not chamfer the edges and corners of the nozzle holes to avoid deviation of the jet trajectory. However, under the continuous impact of high-speed water flow (pressure can reach 20MPa and above), the edges and corners of the nozzle holes are very likely to cause wear or even cracking due to stress concentration, resulting in jet jitter and divergence, uneven descaling, and further resulting in poor cooling effect on the surface of the rolled plate, residual oxide scale, and other problems. In severe cases, the machine needs to be shut down and the nozzle replaced, which greatly increases production costs.

[0003] In the existing technology, some people in the industry have tried to alleviate the wear problem by optimizing chamfers. For example, Chinese patent CN101306409B discloses a design for rounding the edges of guide vanes, but its main purpose is to reduce flow resistance, and it does not optimize the requirements of prefabricated anti-wear curves under high impact loads in rolling and heat treatment scenarios; Chinese patent CN201848324U proposes chamfering the inner side of the nozzle flow channel to stabilize the jet, but this solution will still cause a large amount of wear on the chamfered parts under the high-pressure environment of metal rolling and heat treatment, resulting in a decrease in jet accuracy. Therefore, how to optimize the vulnerable areas at the edges and corners of the nozzle through structural design while ensuring the jet accuracy required by the rolling and heat treatment processes, thereby extending the overall life of the nozzle, has become a technical problem that needs to be solved urgently in the field of metal rolling and heat treatment. Summary of the Invention

[0004] In view of this, the present invention provides a metal descaling nozzle with a prefabricated anti-wear curve and a manufacturing method thereof. The main purpose is to manufacture a nozzle that can not only ensure the jet ejection curve and accuracy, but also has good wear resistance and extended service life through a unique multi-stage chamfering design and precise parameter control, thereby effectively solving the problem of the contradiction between its wear resistance and injection accuracy.

[0005] On the one hand, in order to achieve the above-mentioned purpose, the technical solution provided by the present invention is as follows: A method for manufacturing a metal descaling nozzle with a prefabricated anti-wear curve, suitable for producing nozzles that spray liquid, gas or a gas-liquid mixture in any proportion; The nozzle includes an injection end and a connection end. The injection end is provided with a groove and a curved nozzle hole is opened at the center of the bottom of the groove. The connection end is provided with a contraction cavity, the cavity wall of which is connected to the curved nozzle hole. The connected intersection interface has an original transitional edge, and its tip connects the edge located at the bottom of the groove, the contraction cavity wall and the curved nozzle hole. The manufacturing method includes: Taking the injection direction as the positive direction, perform N chamfering processes on the original transitional corners from outside to inside along the bottom edge of the groove, N ≥ 2, and record them as the 1st to Nth chamfers in sequence, and the corresponding chamfer radii are recorded as R1 to R N The distance between the tip of the original transitional edge and the starting point of the first chamfer is the area to be chamfered, which is recorded as L. A perpendicular line is drawn from the end point of the first to Nth chamfers to the straight line where the edge of the groove bottom is located. The distance between the foot of the perpendicular and the starting point of the first chamfer is recorded as L1 to L N ; R1 is greater than R2, R2 is greater than R3, and so on. N minimum; after the Nth chamfering process, a new transitional edge is formed, and the angle θ between the bottom edge of the groove and the edge of the shrinkage cavity wall is 90°~120°.

[0006] In some embodiments, L1=(0.50-0.70)L.

[0007] In some embodiments, L N -L N-1 =(0.10~0.20)L.

[0008] In some embodiments, when L N =(0.80~0.95)L, the angle θ is 90°~105°; when L N =(0.60~0.80)L, the angle θ is 105°~120°.

[0009] In some embodiments, when L N =(0.70~0.80)L, the angle θ is 110°~120°.

[0010] In some embodiments, the groove runs horizontally through the injection end, and its cross-sectional profile is V-shaped or U-shaped; the curved surface nozzle is a fan-shaped nozzle, and its equivalent aperture is 0.5mm~5.0mm, and the injection angle is 10°~30°; the original transitional edges are located at both ends of the long axis of the fan-shaped nozzle, N=2.

[0011] In some embodiments, R2=(0.07-0.15)R1.

[0012] In some embodiments, the contraction cavity is a conical cavity structure that contracts toward the curved nozzle hole end, and the top angle thereof is 45° to 70°.

[0013] In some embodiments, the outer contour structure of the nozzle is set according to the installation position requirements; the material of the nozzle is tungsten carbide; and the inner and outer surfaces of the nozzle are coated with a wear-resistant or corrosion-resistant coating.

[0014] On the other hand, the technical solution provided by the present invention is a nozzle produced based on the metal descaling nozzle manufacturing method described in the above embodiment. The nozzle is installed inside the nozzle of metal rolling or heat treatment cooling equipment, and is used for high-pressure water descaling, coolant injection or high-pressure blowing.

[0015] Based on the above technical solution, the present invention provides a metal descaling nozzle with a prefabricated anti-wear curve and a manufacturing method thereof. It is different from the traditional nozzle hole non-chamfered design and the chamfered corner design in the conventional mechanical field. It adopts a unique prefabricated anti-wear curve structure design strategy, and performs multi-stage chamfering with different parameters on the corners at the nozzle hole. It can not only ensure that the chamfering does not affect the spray curve and accuracy of the spray during use, but also play a wear-resistant role and extend the service life of the nozzle.

[0016] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 are physical pictures of the nozzles of some embodiments of the present invention;

[0019] Figure 2 are physical cross-sectional views of nozzles according to some embodiments of the present invention;

[0020] Figure 3 Schematic diagram of the structure of the nozzle of some embodiments of the present invention;

[0021] Figure 4 yes Figure 3 An enlarged view of the structure at the corner of part A of the middle nozzle.

[0022] Description of reference numerals: 1—injection end; 2—connection end; 11—groove; 12—curved spray hole; 21—contraction chamber; 111—bottom edge of the groove; 121—edge of the curved spray hole; 211—edge of the contraction chamber wall. DETAILED DESCRIPTION

[0023] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. Among them, the accompanying drawings are only for illustrative purposes and only represent schematic diagrams, not physical drawings, and cannot be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, it is understandable to those skilled in the art that some well-known structures or steps in the accompanying drawings and their descriptions may be omitted.

[0024] In the description of the present invention, it should be noted that the terms "positive direction," "inward," and "outward," etc., indicating directions or positional relationships, are used solely to facilitate description and simplify the present disclosure. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present disclosure. When the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0025] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "mounted," "provided with," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections via an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention.

[0026] Reference Figures 1 to 4 , the specific implementation of a metal descaling nozzle with a prefabricated anti-wear curve and a manufacturing method thereof provided by the present invention is described.

[0027] See the actual pictures of the nozzles of some embodiments of the present invention. Figure 1 , including an injection end 1 and a connecting end 2, the outer contour structure of which is set according to the requirements of the installation position, and is suitable for injecting liquids, gases or gas-liquid mixtures of any proportion. A groove 11 is provided at the injection end 1, and the groove 11 passes horizontally through the injection end 1, and its cross-sectional profile is U-shaped, and in other embodiments it can also be V-shaped. This groove design can form a specific curved surface shape with the nozzle opened at the center of the bottom of the groove, such as a fan-shaped nozzle with an equivalent aperture of 0.5mm to 5.0mm and a spray angle of 10° to 120°, etc., especially a small-angle fan-shaped nozzle of 10° to 30°, which is more conducive to the convergence of the fluid and the control of the injection guide. A contraction cavity 21 that contracts toward the end of the curved nozzle 12 is provided at the connecting end 2, and its structure is a tapered conical cavity, such as Figure 2(a) As shown in the actual cross-sectional view, the cavity wall is connected to the curved nozzle hole 12, which can accelerate the contraction of the medium entering the nozzle, and the top angle of the cone can be set to 45°~70° to ensure the contraction effect of the medium; in other embodiments, the contraction cavity 21 can also be a rotating body structure with a smoother contraction transition, or a herringbone structure, or a structure that combines a stable flow cylinder with a contracting rotating body / cone / herringbone, which helps to accelerate the fluid and form a stable jet. Figure 1 and Figure 2 The curved spray hole 12 in the embodiment is a fan-shaped spray hole with an equivalent aperture of 2.74 mm and a spray angle of 22°. The top angle of the conical cavity provided at the connecting end is 48°. When it is installed inside the nozzle, the medium obtains a higher speed and greater impact force through the conical cavity and is sprayed out from the fan-shaped spray hole at an angle of 22°.

[0028] In fact, due to the unique structure of the nozzle, the intersection of the cavity wall of the contraction cavity 21 and the curved nozzle hole 12 will form a relatively sharp three-dimensional original transitional edge. In some embodiments of the present invention, the bottom of the groove of the nozzle, the contraction cavity wall and the edge of the curved nozzle hole are connected to form the tip of the original transitional edge, such as Figure 1 and Figure 2 (b) is shown in the box position. Figure 2 In the embodiment (d), the original transitional edges of the nozzle are located at both ends of the long axis of the fan-shaped nozzle, including the groove bottom edge 111, the contraction cavity wall edge 211 and the curved nozzle edge 121. In other embodiments, the nozzle groove bottom edge 111 and the Figure 1 and Figure 2 Unlike the straight lines shown in the embodiments, arcs can also be connected to the contracting cavity wall and the three-dimensional edges of the curved spray hole to form transitional angular tips, such as narrow-angle fan nozzles and wide-angle K-shaped nozzles. For nozzles, a well-designed angular design not only ensures a more stable and orderly flow of the medium and reduces turbulence, but also controls the spray angle and direction of the medium, preventing unnecessary diffusion or deviation during the spraying process, thereby ensuring the accuracy and consistency of the spray. For example, when applied to steel plate descaling, the sharp corners of the nozzle can form a finer, more concentrated jet of water when it is ejected. According to the principles of fluid mechanics, a fine, concentrated jet can generate greater impact force at the same pressure. During the steel plate descaling process, the strong impact force helps to more effectively strip and remove the iron oxide scale on the steel plate surface, improving the descaling efficiency and quality. Furthermore, by rationally designing the shape and angle of the nozzle's angular shape, the ejected water flow can be formed into different spray shapes, such as fan-shaped and cone-shaped, thereby regulating the water flow's coverage of the steel plate surface and improving the uniformity and integrity of the descaling process.

[0029] In the field of nozzle manufacturing, the material and structural design of nozzles are crucial, as nozzles often need to withstand the impact and wear of media such as high-pressure water or gas during the injection process. High-strength, wear-resistant materials such as tungsten carbide and ceramics are usually used to manufacture nozzles. Furthermore, considering the complexity of the service environment, certain surface treatment processes can also be used in the material design of nozzles. For example, wear-resistant or corrosion-resistant coatings can be applied to the inner and outer surfaces through physical vapor deposition or chemical plating. The coating thickness and composition can be adjusted according to the actual working conditions to improve the corresponding service performance. At the same time, the nozzle's structural design must also ensure sufficient strength and stability under high pressure. However, paradoxically, while chamfering in conventional mechanical fields can improve the wear resistance and service stability of nozzle corners, it can easily have a negative impact on injection accuracy. For example, at the same chamfer position, the larger the chamfer radius, the less the change to the nozzle's internal shape. Although it can ensure injection accuracy, it has limited blunting of the sharp corners and is more prone to wear. On the other hand, the smaller the chamfer radius, the greater the change to the nozzle's internal shape. Although the sharp corners are effectively blunted and wear resistance is improved, it affects the injection direction and accuracy. Therefore, in order to ensure injection accuracy, most traditional nozzles use a non-chamfered design at their corners. This results in rapid wear of the nozzle orifice during use, making it prone to deformation, cracking, or damage. This changes the jet trajectory and reduces accuracy, thus affecting the injection effect.

[0030] To solve the above problems, the present invention provides a unique structural design method for prefabricated anti-wear curves. Through reasonable parameter design, the wear resistance of the nozzle is improved while the requirements for use accuracy are met. In some embodiments, Figure 3 and Figure 4 As shown in the structural diagram of the nozzle, the manufacturing method of the nozzle includes: Figure 4 The direction indicated by the arrow is the injection direction. As the positive direction, the original transitional corners are chamfered from the outside to the inside of the nozzle along the bottom edge of the groove for N times. N ≥ 2. The chamfers are recorded as the 1st to Nth times in sequence. The corresponding chamfer radii are recorded as R1 to R N . Different from the starting point of conventional mechanical chamfering, the manufacturing method disclosed in the present invention proposes a multi-stage chamfering idea to ensure the injection accuracy. Among them, from the outside to the inside is to ensure that the transitional edges and corners still have a strong guiding effect. Unlike conventional chamfering that easily causes the injection medium to diverge, it can make the direction and angle of the medium ejected from the nozzle more accurate during injection; and unlike single chamfering, multi-stage chamfering can be refined through the prefabricated curve design of the nozzle according to the targeted nozzle service requirements, so as to obtain transitional edges and corners that meet both precision and wear resistance requirements.

[0031] In the manufacturing method of the present invention, R1 of N chamfering treatments is greater than R2, R2 is greater than R3, and so on. NThe minimum, and after the Nth chamfering treatment, a new transitional edge is formed, and the angle θ between the edge of the bottom of the groove and the edge of the contraction cavity wall is blunted from the conventional acute angle to an obtuse angle of 90° to 120°. Such moderate blunting can avoid the problem of severe stress concentration caused by too small θ, and can also stabilize the water outlet on the basis of ensuring the injection accuracy, which is beneficial to increase the impact force and superposition amount, thereby improving the injection effect and efficiency. On the one hand, the decreasing chamfer radius design, compared with the chamfer with a smaller radius, can perform large-scale pretreatment of high-stress areas of the nozzle that are prone to cracks, wear and other defects through chamfering with a larger radius, while the decreasing multi-stage chamfering gradually optimizes the stress distribution in the chamfer area, better retaining the advantage of mechanical chamfering in alleviating stress concentration in a large range. On the other hand, if only a single large-scale chamfer is used, due to the large radius of the chamfer, the final angle θ obtained after it intersects with the edge of the contraction cavity wall is small, so the wear resistance at the edge is limited. The use of a smaller radius chamfer can perform chamfering in a larger angle range within a limited area, which is conducive to obtaining a more ideal angle in the end. At the same time, the decreasing chamfer radius also provides a good connection for multiple chamfering treatments with different functions, which can not only effectively disperse the impact force during medium injection and play a wear-resistant role, but also more accurately control the angle θ of the new transitional edge to 90°~120°, providing manufacturing space for improving the final injection accuracy and stability.

[0032] Figure 2 and Figure 3 The embodiment shown is a steel plate descaling nozzle, the curved spray hole is fan-shaped, and there are original transitional edges at both ends of the long axis. The manufacturing method of the present invention is used to perform two chamfering processes. Figure 3 The cross-section A area of ​​the embodiment is enlarged, as shown in FIG. Figure 4 As shown in the figure, the distance between the tip of the original transitional edge and the starting point of the first chamfer is the area to be chamfered, which is recorded as L. In other embodiments, L can be determined based on the area where the nozzle is prone to failure in actual working conditions, or by calculating the high stress area of ​​the nozzle through simulation software, or by converting the former and the latter by a certain coefficient in combination with the requirements of the nozzle application scenario. Figure 4 In order to explain the chamfering process, after determining the area to be chamfered L, the parameters of multiple chamfers are quantified, that is: a perpendicular line is drawn through the end points of the first and second chamfers to the straight line where the edge of the bottom of the groove is located, and the distance between the foot of the perpendicular and the starting point of the first chamfer is recorded as L1 and L2 respectively; after quantification, L can reflect the range of the total chamfer, while L1 and L2-L1 can represent the range of the first and second chamfers respectively, and the actual machining range of the original transitional edge can also be calculated as L-L2. Figure 4In the embodiment, the first chamfer has R1 = 12.5mm, the second chamfer has R2 = 1.25mm, R1 is much larger than R2, the angle θ is 114°, and the corresponding L, L1 and L2 are 4.6mm, 2.7mm and 3.5mm respectively. By calculation, it can be seen that the range of the first chamfer is L1 = 2.7mm, the range of the second chamfer is L2-L1 = 0.8mm, and the actual processing range is L-L2 = 1.1mm; which are approximately 59%, 17% and 24% of the total chamfer range L respectively. Figure 4 It can be seen that after two rounding treatments, the original sharp transitional corners are blunted, but still maintain a certain sharp angle state, which not only ensures the injection accuracy but also improves the injection stability. The larger high stress concentration range is also smoothed through multiple rounding treatments, which not only effectively connects the transitional corners after passivation, but also optimizes the overall stress distribution of the total chamfer range L, which is beneficial to improving the service life of the nozzle. The actual chamfering situation can be referred to Figure 2 As shown in (d), the black solid line is the first chamfered part, and the white solid line is the second chamfered part (due to the stress concentration on the corners during cross-section processing, some wear occurs). In addition, in the present invention, considering the need to ensure wear resistance while simplifying the manufacturing process and improving production efficiency, for some embodiments with N=2, the chamfer radius parameter R2 can be further refined to (0.07~0.15)R1, as shown in Figure 4 The embodiment shows that R2=0.10R1.

[0033] In some embodiments, a larger chamfer radius reduces stress concentration at corners, resulting in a more uniform and gentler stress distribution. Furthermore, during multiple chamfering processes, R1 is the largest. Therefore, to fully utilize the advantages of the first chamfer during nozzle manufacturing, the chamfer range should be increased as much as possible to reduce stress in nozzle failure-prone areas. Research by the present inventors has found that when L1 = (0.50-0.70) L, stress relief is achieved in most areas while leaving sufficient space for subsequent multiple chamfering operations.

[0034] In the manufacturing method of the present invention, the last chamfering process is closely related to the final shape of the transitional corners. In order to further balance the contradiction between injection accuracy and wear resistance, in some embodiments, the range L of the last chamfering process is set to N -L N-1 =(0.10~0.20)L, this is mainly due to the fact that in multiple chamfering processes, R N Minimum, when L N -L N-1 When it is greater than 0.20L, the larger radius R1~R N-1 The pretreatment range of stress relief is reduced, which is not conducive to the optimization of the overall stress distribution. In order to ensure the internal shape of the nozzle, R NThe lower limit of the value will also increase, which will limit the range of the final angle θ, reduce the degree of passivation, and weaken the wear resistance. N -L N-1 When it is less than 0.10L, the proportion of the corner tip formed after the last chamfer to the total chamfer range is too small, which is not conducive to the transmission of impact force during injection and is prone to stress concentration. On the other hand, L N -L N-1 The smaller the range, the N The lower the lower limit of the value, the more likely it is that the final angle θ will be overly blunted, affecting the injection direction and accuracy.

[0035] In the manufacturing method of the present invention, the selection of the angle θ can be adapted to the specific working conditions and injection requirements of the nozzle. In some embodiments, high-precision injection parameters are required, that is, the actual machining range of the nozzle corners should be as small as possible, and the L N In the range of (0.80~0.95)L, in order to avoid stress concentration and improve wear resistance, multi-stage chamfering can be used to slightly blunt it, and the final angle θ is 90°~105°. In other embodiments, the nozzle service mainly considers wear resistance and reducing stress concentration, that is: under the premise of ensuring a certain accuracy, the actual range of the nozzle edge should be as large as possible, and L should be controlled. N When the L range is (0.60-0.80), the final angle θ is 105°-120° because the obtuse angle can better disperse the stress and reduce the stress concentration.

[0036] Furthermore, in some embodiments, when L N =(0.70~0.80)L, the angle θ can be further set to 110°~120° to meet the requirements of wear resistance and use accuracy. Figure 4 As an example, the optimization parameters are further explained. This embodiment assumes that the wear resistance is the main consideration. N =0.76L, and the angle θ is 114°. Testing the precision of the nozzle revealed that the spray angle, landing point distribution and other parameters of the prefabricated anti-wear curve nozzle, compared with the design requirements, can meet the use requirements. Multiple chamfering treatments have no adverse effects on the spray characteristics, and the spray accuracy deviation is less than 2%. By simulating actual working conditions to test the effectiveness of the nozzle's wear-resistant design, it was observed that after a certain period of operation, the wear of key parts such as the nozzle hole and transitional edges under a metallographic microscope was significantly reduced compared to traditional nozzles, and the wear resistance was improved. Actual production line application data also shows that the average service life of the prefabricated anti-wear curve nozzle of the present invention is increased by about 12% or more compared to ordinary nozzles.

[0037] In some embodiments, the present invention also provides a metal descaling nozzle produced using the above-mentioned manufacturing method, which is combined with an adaptive connection structure, etc. and installed inside the nozzle of metal rolling or heat treatment cooling equipment for high-pressure water descaling, coolant injection or high-pressure blowing to form a complete nozzle product.

[0038] The terms "including" and "having" and any variations thereof in the description and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatus.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for manufacturing a metal descaling nozzle with a prefabricated anti-wear curve, suitable for nozzles that spray liquid, gas or a gas-liquid mixture in any proportion, characterized in that: The nozzle includes an injection end and a connection end. The injection end is provided with a groove, and a curved spray hole is opened at the center of the bottom of the groove. The connection end is provided with a contraction cavity, and its cavity wall is connected to the curved spray hole. The connected intersecting interface has an original transitional edge, the tip of which connects the edge located at the bottom of the groove, the contraction cavity wall and the curved surface nozzle hole; The manufacturing method comprises: Taking the injection direction as the positive direction, perform N chamfering processes on the original transitional corner from outside to inside along the bottom edge of the groove, N≥2, and record them as the 1st to Nth chamfers in sequence, and the corresponding chamfer radii are recorded as R1 to R N The distance between the tip of the original transitional edge and the starting point of the first chamfer is the area to be chamfered, which is recorded as L. A perpendicular line is drawn from the end point of the first to N chamfers to the straight line where the bottom edge of the groove is located. The distance between the foot of the perpendicular and the starting point of the first chamfer is recorded as L1 to L N ; R1 is greater than R2, R2 is greater than R3, and so on. N minimum; after the Nth chamfering process, a new transitional edge is formed, and the angle θ between the bottom edge of the groove and the edge of the shrinkage cavity wall is 90°~120°.

2. The method for manufacturing a metal descaling nozzle according to claim 1, characterized in that: The L1=(0.50~0.70)L.

3. The method for manufacturing a metal descaling nozzle according to claim 1, characterized in that: The L N -L N-1 =(0.10~0.20)L.

4. The method for manufacturing a metal descaling nozzle according to claim 1, characterized in that: When the L N =(0.80~0.95)L, the angle θ is 90°~105°; when L N =(0.60~0.80)L, the angle θ is 105°~120°.

5. The method for manufacturing a metal descaling nozzle according to claim 1, characterized in that: When the L N =(0.70~0.80)L, the angle θ is 110°~120°.

6. The method for manufacturing a metal descaling nozzle according to claim 1, characterized in that: The groove runs horizontally through the injection end, and its cross-sectional profile is V-shaped or U-shaped; the curved surface spray hole is a fan-shaped spray hole, whose equivalent aperture is 0.5mm~5.0mm and the injection angle is 10°~30°; the original transitional edges are located at both ends of the long axis of the fan-shaped spray hole, N=2.

7. The method for manufacturing a metal descaling nozzle according to claim 6, characterized in that: The R2=(0.07~0.15)R1.

8. The method for manufacturing a metal descaling nozzle according to claim 1, characterized in that: The contraction cavity is a conical cavity structure that contracts toward the curved spray hole end, and the top angle thereof is 45° to 70°.

9. The method for manufacturing a metal descaling nozzle according to claim 1, characterized in that: The outer contour structure of the nozzle is set according to the installation position requirements; the material of the nozzle is tungsten carbide; the inner and outer surfaces of the nozzle are plated with wear-resistant or corrosion-resistant coatings.

10. A nozzle produced based on the method for manufacturing a metal descaling nozzle according to any one of claims 1 to 9, characterized in that: The nozzle is installed inside the nozzle of metal rolling or heat treatment cooling equipment and is used for high-pressure water descaling, coolant injection or high-pressure blowing.

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