Novel guide for pipe rolling equipment and method of manufacturing thereof

Abstract

A new guide plate for pipe rolling equipment belongs to the technical field of pipe rolling related equipment. The guide plate base body includes a working section for contacting with the pipe during the pipe rolling process, and a laser cladding alloy layer is arranged on the outer surface of the working section. The application also provides a manufacturing method of the new guide plate for pipe rolling equipment. The application uses laser cladding technology to process the surface of the guide plate, especially the surface of the working section, to strengthen the surface strength of the guide plate. The application uses laser cladding technology to form a cladding alloy layer (formed by selected coating materials after laser cladding) and a base body (guide plate in the application) to form a metallurgical bonding feature with high bonding strength; laser cladding can provide fast heating and fast cooling metallurgical conditions, make the structure dense and refined, and easily form metastable or amorphous structure; the dilution rate of the cladding layer is small, and the cladding thickness can be accurately controlled; the overheating area is small, and the adverse effect on the base material is small.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of pipe rolling related equipment, and more particularly to a new type of guide plate for pipe rolling equipment and a manufacturing method of the new type of guide plate for pipe rolling equipment. BACKGROUND

[0002] In steel pipe production operations, usually, pipe materials are used as raw materials to manufacture steel pipes meeting customer requirements through pipe expanding process (to realize pipe diameter expansion) or rolling process (to realize pipe diameter reduction or wall thickness reduction).

[0003] In the pipe rolling operation of steel pipes, the pipe rolling equipment is usually used, and especially when producing thin-walled pipes (D / S≥11.5, wall thickness <25mm), a larger rolling force is usually required. Since the pipe material is under a large force, the guide plate for guiding the pipe material is also under a large force. The guide plate is in contact with the pipe material, and the wear resistance of the guide plate is easily reduced due to overheating in the production process, the guide plate may stick to the steel, and in severe cases, local chipping may occur. Once the guide plate has structural defects, it will cause spiral scratches on the surface of the steel pipe locally or along the whole length, which seriously affects the product quality and prolongs the delivery cycle. SUMMARY

[0004] (I) Technical problem

[0005] In summary, how to solve the problem of sticking of the guide plate in the continuous rolling process in the prior art has become a problem to be solved by the technical personnel in the field.

[0006] (II) Technical solution

[0007] To solve the above problems, the present application provides a new type of guide plate for pipe rolling equipment, which comprises a guide plate base body, the guide plate base body comprises a working section for contacting with the pipe material in the pipe rolling process; a laser cladding alloy layer is arranged on the outer surface of the working section.

[0008] Preferably, in the new type of guide plate for pipe rolling equipment provided by the present application, one side surface of the working section is a guide contact surface for contacting with the pipe material; the laser cladding alloy layer is arranged on the guide contact surface.

[0009] Preferably, in the new type of guide plate for pipe rolling equipment provided by the present application, the guide contact surface is a smooth concave arc surface.

[0010] Preferably, in the new guide plate for pipe rolling equipment provided by the application, during the pipe rolling process, the laser cladding alloy layer comprises a starting contact section, an intermediate guide section and an ending section along the rolling direction of the pipe; the thickness of the starting contact section gradually increases, the thickness of the ending section gradually decreases, and the thickness of the intermediate guide section remains unchanged along the rolling direction of the pipe; the thickest thickness of the starting contact section is consistent with that of the intermediate guide section, and the thickest thickness of the ending section is consistent with that of the intermediate guide section.

[0011] The application further provides a manufacturing method of the new guide plate for pipe rolling equipment, which comprises the following steps:

[0012] Step 1: treating the working section surface of the guide plate base body to form a smooth surface;

[0013] Step 2: laying laser cladding alloy powder on the working section surface of the guide plate base body;

[0014] Step 3: melting the laser cladding alloy powder by laser cladding and forming a metallurgical bonding structure with the working section surface of the guide plate base body.

[0015] Preferably, in the manufacturing method of the new guide plate for pipe rolling equipment provided by the application, in the step 3, the laser cladding path is linear, and the single cladding is performed from top to bottom or from bottom to top in the vertical direction of the pipe rolling direction until the working section of the guide plate base body is covered.

[0016] Preferably, in the manufacturing method of the new guide plate for pipe rolling equipment provided by the application, in the step 3, the laser cladding path is S-shaped.

[0017] Preferably, in the manufacturing method of the new guide plate for pipe rolling equipment provided by the application, in the step 3, the point laser cladding mode is adopted, and matrix cladding spots are formed on the working section surface of the guide plate base body.

[0018] (Three) beneficial effects:

[0019] The beneficial effects of the application are as follows:

[0020] As described above, this invention provides a novel guide plate for pipe rolling equipment, comprising a guide plate substrate, the guide plate substrate including a working section for contacting the pipe material during the pipe rolling process, and a laser cladding alloy layer disposed on the outer surface of the working section. Simultaneously, this invention also provides a method for manufacturing the novel guide plate for pipe rolling equipment. In this invention, laser cladding technology is used to treat the surface of the guide plate, especially the surface of the working section, thereby strengthening the surface strength of the guide plate. Laser cladding technology refers to placing a selected coating material on the surface of a substrate using different filler methods, and then using laser cladding to melt the selected coating material and the substrate surface (a thin layer on the substrate surface) simultaneously, and rapidly solidifying to form a surface coating with extremely low dilution and metallurgical bonding with the substrate material. This alloy layer forms a composite material with the substrate, which can fully utilize the advantages of both the cladding layer and the substrate, thereby significantly improving the surface performance of the substrate material. Laser cladding technology has the following advantages: 1. The alloy layer (formed by laser cladding of selected coating materials) and the substrate (a guide plate in this invention) form a metallurgical bond with high bonding strength; 2. The rapid heating and cooling metallurgical conditions provided make the microstructure dense and refined, and it is very easy to form metastable or amorphous microstructures; 3. The dilution rate of the cladding layer is small, and the cladding thickness can be precisely controlled; 4. The overheated area is small, and the adverse effects on the substrate are minimal. Attached Figure Description

[0021] Figure 1 This is a simplified structural diagram of the guide plate for the novel tube rolling equipment in an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the manufacturing method of the guide plate for the novel tube rolling equipment in this embodiment of the invention, which uses a linear laser cladding path.

[0023] Figure 3 This is a schematic diagram of the manufacturing method of the guide plate for the novel tube rolling equipment in an embodiment of the present invention, using an S-shaped laser cladding path;

[0024] Figure 4 This is a schematic diagram of the method for manufacturing guide plates for novel tube rolling equipment in an embodiment of the present invention, which uses spot laser cladding.

[0025] exist Figures 1 to 4 middle:

[0026] Guide plate substrate 1, laser cladding alloy layer 2, starting contact section 21, intermediate guide section 22, ending section 23;

[0027] a represents the laser cladding alloy layer formed by a single cladding process, b represents the laser cladding alloy layer formed by S-shaped path cladding, and c represents the laser cladding alloy layer formed by spot cladding. Detailed Implementation

[0028] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the embodiments of the present application with reference to the drawings.

[0029] In addition, in the description of the present application, the orientations or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. are based on the orientations or positional relationships shown in the drawings and are merely for the purpose of facilitating the description of the present application and not for the purpose of requiring the present application to be necessarily constructed and operated in a particular orientation, and therefore should not be construed as limiting the present application. The terms "connected", "connected" used in the present application should be construed broadly, for example, can be fixed connection, can also be detachable connection; can be directly connected, can also be indirectly connected through intermediate components, and those skilled in the art can understand the specific meanings of the above terms according to the specific circumstances.

[0030] Reference is made to Figures 1 to 4 , wherein, Figure 1 is a schematic diagram of the structure of the new guide plate for pipe rolling equipment in the embodiments of the present application. Figure 2 is a schematic diagram of the manufacturing method of the new guide plate for pipe rolling equipment in the embodiments of the present application using a linear laser cladding path; Figure 3 is a schematic diagram of the manufacturing method of the new guide plate for pipe rolling equipment in the embodiments of the present application using an S-shaped laser cladding path; Figure 4 is a schematic diagram of the manufacturing method of the new guide plate for pipe rolling equipment in the embodiments of the present application using a spot laser cladding.

[0031] The present application provides a new guide plate for pipe rolling equipment, which comprises a guide plate base body 1, i.e. an existing guide plate for pipe rolling equipment. The guide plate base body 1 comprises a working section for contacting the pipe material during the pipe rolling process. The working section contacts the pipe rolling, thereby playing a guiding role for the pipe rolling. The working section always contacts the pipe material being rolled during the pipe rolling process. In order to improve the structural strength of the working section, mainly the surface of the working section contacting the pipe rolling, the present application is provided with a laser cladding alloy layer 2 on the outer surface of the working section.

[0032] Further, one side surface of the working section is a guiding contact surface for contacting the pipe material. The present application is provided with a laser cladding alloy layer on the guiding contact surface. The guiding contact surface is the surface of the working section of the guide plate base body 1 contacting the pipe material (not the entire outer surface of the working section). The present application sets the laser cladding alloy layer on the guiding contact surface, which can reduce the setting area of the laser cladding alloy layer and minimize the degree of modification of the guide plate base body 1.

[0033] In one embodiment of the present application, the guide contact surface is a smooth concave arc surface, that is, in the rolling direction of the pipe, the cross section of the guide plate base 1 is cut, and the cross section shape of the guide contact surface is a concave arc. The guide contact surface adopts a smooth concave arc surface structure design, which is more matched with the surface shape of the pipe and more accurate and stable in guiding the pipe.

[0034] Further, in the rolling direction of the pipe, the laser cladding alloy layer 2 includes a starting contact section 21 (a section preliminarily contacted with the pipe), an intermediate guide section 22 (a main section for guiding the pipe), and an end section 23 (a section for separating the pipe from the guide plate). In the rolling direction of the pipe, the thickness of the starting contact section 21 gradually increases, the thickness of the end section 23 gradually decreases, and the thickness of the intermediate guide section 22 remains unchanged. The thickest thickness of the starting contact section 21 is consistent with that of the intermediate guide section 22, and the thickest thickness of the end section 23 is consistent with that of the intermediate guide section 22. Specifically, the thickness of the intermediate guide section 22 is between 3 mm and 8 mm, and the minimum thickness of the starting contact section 21 and the end section 23 should be no less than 3 mm. The thickness of the transition layer (i.e., the metallurgical bonding structure) between the starting contact section 21, the intermediate guide section 22, and the end section 23 and the guide plate base 1 is not less than 1 mm, and is generally about 1.5 mm.

[0035] The present application also provides a manufacturing method of the new type of guide plate for pipe rolling equipment. In the present application, the manufacturing method of the new type of guide plate for pipe rolling equipment includes the following steps: step one, treating the working section surface of the guide plate base to form a smooth surface; step two, laying laser cladding alloy powder on the working section surface of the guide plate base; and step three, melting the laser cladding alloy powder by laser cladding and forming a metallurgical bonding structure with the working section surface of the guide plate base. The first and second steps in the present application are to prepare for the third step. The surface of the guide plate base is treated to be flat, which can ensure that the transition layer between the laser cladding alloy layer and the guide plate base remains consistent. The laser cladding alloy powder is laid on the working section surface of the guide plate base, which enables the laser cladding operation. Step three is to specifically perform laser cladding.

[0036] Specifically, in one embodiment of the present application, in step three, the laser cladding path is linear, that is, the moving path of the laser head is linear, and the laser head emits laser light during single directional movement, thereby heating the laser cladding alloy powder on the path to form a composite metal layer. In this embodiment, single cladding is performed from top to bottom or from bottom to top in the direction perpendicular to the rolling direction of the pipe until the working section of the guide plate substrate is covered, and then the above operation is repeated in the direction parallel to the rolling direction of the pipe. It is defined that the side edges of the laser cladding alloy layers formed by two adjacent single laser cladding (one relatively short alloy layer with a certain width) overlap, and the overlap width is 0.2-0.3 times the width of the laser cladding alloy layer formed by single laser cladding.

[0037] Specifically, in another embodiment of the present application, in step three, the laser cladding path is S-shaped. It is defined that the side edges of the laser cladding alloy layers formed by two adjacent single laser cladding (one relatively short alloy layer with a certain width) overlap, and the overlap width is 0.2-0.3 times the width of the laser cladding alloy layer formed by single laser cladding.

[0038] Specifically, in still another embodiment of the present application, in step three, a dot-like laser cladding method is used to form a matrix cladding spot on the surface of the working section of the guide plate substrate. The present application can first perform laser cladding in the transverse direction and then perform operation in the longitudinal direction. The edges of two adjacent laser cladding spots overlap, and the overlapping area is 20%-30% of the area of a single laser cladding spot.

[0039] In the prior art, the guide plate material used in the pipe rolling equipment is 4828W5, and the following problems occur during production: in the continuous rolling process, due to frequent temperature rise and fall (the guide plate is heated when it is in contact with the high-temperature pipe, and the guide plate is rapidly cooled when it is separated from the pipe after the rolling of the current pipe section is completed), the surface of the working section of the guide plate appears to be sticky and chipped, thereby causing the steel pipe to be easily scratched in the rolling process.

[0040] To solve the above problems, the present application provides a method for preventing spiral scratches of a thin-walled pipe guide plate. The present application is based on laser surface cladding technology, and the chemical composition of the existing guide plate working section is not changed. The surface of the existing guide plate working section is strengthened to avoid the occurrence of surface sticking of the guide plate working section, reduce the number of grinding, and ensure that the guide plate has good high-temperature resistance and wear resistance, as well as a smooth surface.

[0041] The present application provides a new type of guide plate for a pipe rolling equipment, which comprises a guide plate substrate, and the guide plate substrate comprises a working section for contacting with a pipe during pipe rolling. The present application is provided with a laser cladding alloy layer on the outer surface of the working section.

[0042] In the present application, the surface of the guide plate, especially the surface of the working section of the guide plate, is treated by laser cladding technology, so as to strengthen the surface strength of the guide plate. The laser cladding technology refers to that a selected coating material is placed on the surface of a coated substrate in different filling ways, and the selected coating material and the surface (a thin layer of the surface) of the substrate are melted at the same time by laser cladding, and after rapid solidification, a surface coating with extremely low dilution and metallurgical bonding with the substrate material is formed. The alloy layer and the substrate form a composite material, which can fully exert the advantages of the cladding layer and the substrate, so as to significantly improve the performance of the surface of the substrate material. The laser cladding technology has the following advantages: 1. The alloy layer (formed by the selected coating material after laser cladding) and the substrate (the guide plate in the present application) form a metallurgical bonding feature, and the bonding strength is high; 2. The fast heating and fast cooling metallurgical conditions provided make the organization dense and refined, and it is extremely easy to form a metastable or amorphous organization; 3. The dilution rate of the cladding layer is small, and the cladding thickness can be accurately controlled; 4. The overheating area is small, and the adverse effect on the substrate is small.

[0043] From the common general knowledge, the present application can be realized by other embodiments without departing from the essence or essential characteristics of the present application. Therefore, the above disclosed embodiments are only illustrative in all aspects, and are not the only ones. All changes within the scope of the present application or within the scope equivalent to the present application are included in the present application.

Claims

1. A new type of guide plate for pipe rolling equipment, comprising a guide plate base (1), characterized in that, the guide plate base comprises a working section for contacting the pipe material during pipe rolling; a laser cladding alloy layer (2) is arranged on the outer surface of the working section; one side of the working section is a guide contact surface for contacting the pipe material; the laser cladding alloy layer is arranged on the guide contact surface; the guide contact surface is a smooth concave arc surface; in the pipe rolling process, along the rolling direction of the pipe material, the laser cladding alloy layer comprises a starting contact section (21), an intermediate guide section (22), and an end section (23); along the rolling direction of the pipe material, the thickness of the starting contact section gradually increases, the thickness of the end section gradually decreases, and the thickness of the intermediate guide section remains the same, the thickest thickness of the starting contact section is consistent with the intermediate guide section, and the thickest thickness of the end section is consistent with the intermediate guide section; the thickness of the intermediate guide section (22) is between 3mm and 8mm, and the minimum thickness of the starting contact section (21) and the end section (23) is not less than 3mm.

2. A method of manufacturing a new type of guide for a pipe rolling mill, characterized in that, comprising: Step 1: treating the surface of the working section of the guide plate base to form a smooth surface; Step 2: laying laser cladding alloy powder on the surface of the working section of the guide plate base; Step 3: using laser cladding to melt the laser cladding alloy powder and form a metallurgical bonding structure with the surface of the working section of the guide plate base; in Step 3, the laser cladding path is linear, and in the direction perpendicular to the rolling direction of the pipe material, single cladding is performed from top to bottom or from bottom to top until the working section of the guide plate base is covered; the side edges of the laser cladding alloy layers formed by adjacent two single laser cladding overlap, and the overlap width is 0.2-0.3 times the width of the laser cladding alloy layer formed by single laser cladding; or, in Step 3, the laser cladding path is S-shaped, and the side edges of the laser cladding alloy layers formed by adjacent two single laser cladding overlap, and the overlap width is 0.2-0.3 times the width of the laser cladding alloy layer formed by single laser cladding; or, in Step 3, a dot-like laser cladding method is used, and a matrix cladding spot is formed on the surface of the working section of the guide plate base; the edges of adjacent two laser cladding spots overlap, and the overlapping area is 20-30% of the area of a single laser cladding spot.

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