A deburring roller and its preparation method and application

Abstract

This application relates to the field of steel rolling technology, and particularly to a deburring roller, its preparation method, and its application. The deburring roller includes a support roller and a curved bottom roller; the curved bottom roller is located directly below the support roller and is symmetrically arranged relative to the support roller; the support roller includes a first steel substrate and a first coating, the first coating covering the surface of the first steel substrate; the curved bottom roller includes a second steel substrate and a second coating, the second coating covering the surface of the second steel substrate; the method includes: obtaining the first steel substrate of the support roller or the second steel substrate of the curved bottom roller; obtaining coating material; laser-coating the coating material onto the surface of the first steel substrate or the second steel substrate to obtain the support roller or the curved bottom roller; installing and fixing the support roller or the curved bottom roller to obtain the deburring roller; the application includes: using the deburring roller to remove burrs after disc shearing of steel products; and improving the burr removal effect by utilizing the coating and the curved bottom roller.

Description

Technical Field

[0001] This application relates to the field of steel rolling technology, and in particular to a deburring roller, its preparation method and application. Background Technology

[0002] After continuous annealing, cold-rolled strip steel needs to be trimmed at the edges using a disc shear. This serves two purposes: firstly, to precisely control the strip steel width according to order requirements, and secondly, to remove edge defects. However, after being sheared by a disc shear, cold-rolled strip steel inevitably develops a large number of small burr defects at the edges, affecting the product's appearance and quality.

[0003] Currently, deburring rollers are used to press down on both sides of the strip steel to remove burrs through extrusion. However, conventional deburring rollers are made of chrome-plated material, and the bottom roller is a flat roller. During multiple deburring processes, due to the low hardness and wear resistance of the chrome-plated coating, the bottom roller of the flat deburring roller will have poor burr removal effect during use. Therefore, how to improve the removal effect of deburring rollers is a technical problem that urgently needs to be solved. Summary of the Invention

[0004] This application provides a deburring roller, its preparation method, and its application, to solve the technical problem that it is difficult to improve the deburring effect of the deburring roller in the prior art.

[0005] In a first aspect, this application provides a deburring roller, which includes a support roller and a curved bottom roller;

[0006] A curved bottom roller is provided directly below the support roller, and the curved bottom roller is symmetrically arranged with respect to the vertical plane where the center line of the support roller is located;

[0007] The support roller includes a first steel substrate and a first coating, wherein the first coating covers the surface of the first steel substrate;

[0008] The curved bottom roller includes a second steel substrate and a second coating. The second steel substrate is symmetrically arranged with respect to the vertical plane where the center line of the first steel substrate is located, and the second coating covers the surface of the second steel substrate.

[0009] The metallographic structure of the coating comprises martensite and alloy carbides; the alloy carbides comprise carbides of Co, Cr, Mo and hSi.

[0010] Optionally, the roller surface of the curved bottom roller is curved, and the diameter of the curved surface is 500mm to 1000mm.

[0011] Optionally, the thickness of the coating is 150μm to 180μm.

[0012] Optionally, by volume fraction, the metallographic structure of both the first coating and the second coating comprises: lamellar martensite: 85%–95%, and alloy carbides: 5%–15%.

[0013] Secondly, this application provides a method for preparing a deburring roller, the method comprising:

[0014] Obtain the first steel substrate of the support roller or the second steel substrate of the curved bottom roller;

[0015] Obtain coating raw materials;

[0016] The coating material is laser-fused onto the surface of the first steel substrate or the second steel substrate to obtain a support roller with a first coating or a curved bottom roller with a second coating.

[0017] The support roller or the curved bottom roller is installed and fixed to obtain a deburring roller.

[0018] Optionally, the atmosphere for laser cladding is an argon atmosphere.

[0019] Thirdly, this application provides an application of the deburring roller described in the first aspect and the deburring roller prepared by the method described in the second aspect, the application including: using the deburring roller to remove burrs from steel products after disc shearing.

[0020] Optionally, the thickness of the steel product is 0.5mm to 2.5mm.

[0021] The technical solutions provided in this application have the following advantages compared with the prior art:

[0022] This application provides a deburring roller, its preparation method, and its application. By designing the support roller and the curved bottom roller, the curved bottom roller at the lower end of the deburring roller can fully contact the surface of the steel to be deburred. Furthermore, the curved roller, due to its curved surface, experiences uniform force and is more wear-resistant than the flat roller. The coating, including martensite and alloy carbides, further enhances the hardness and wear resistance of the support roller and the curved bottom roller, facilitating the removal of burrs from the surface of cold-rolled strip steel. Thus, the coating and the designed curved bottom roller improve the burr removal effect of cold-rolled strip steel. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic flowchart illustrating a method for preparing a deburring roller according to an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the structure of a deburring roller provided in an embodiment of this application;

[0027] Figure 3 A schematic diagram of the structure of the first and second coatings of a deburring roller provided in this application embodiment;

[0028] Figure 4 This is a schematic diagram of a deburring roller provided in an embodiment of this application.

[0029] Wherein, 1-support roller, 11-first steel substrate, 12-first coating, 2-curved bottom roller, 21-second steel substrate, 22-second coating, 31-martensite, 32-alloy carbide. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] The inventive concept of this application is as follows: Since the deburring roller is a thin-walled sleeve roller, composed of an upper support roller 1 and two lower deburring rollers on both sides, pressure is applied by a cylinder during production to press the strip steel on both sides, achieving the deburring effect through extrusion. A physical image is shown below. Figure 4 As shown, the deburring roller equipment has high requirements for the strength, wear resistance and fatigue resistance of the first coating 12 on the roller surface. Since the deburring roller equipment is in long-term contact with the burrs of the strip steel, it is a wear-prone equipment. Frequent replacement will increase the equipment cost and affect the smooth operation of the production line, thus restricting the increase in output.

[0032] Meanwhile, since the deburring roller achieves close contact and compression with both sides of the strip through cylinder pressure during use, the inertia of the deburring roller not only affects the deburring effect, but also significantly affects the wear of its own roller surface, causing a large number of pits on the roller surface and thus failure. It may also introduce new defects on the surface of the strip.

[0033] In one embodiment of this application, a deburring roller, such as Figure 2 , Figure 3 and Figure 4 As shown, the deburring roller includes a support roller 1 and a curved bottom roller 2;

[0034] A curved bottom roller 2 is provided directly below the support roller 1, and the curved bottom roller 2 is symmetrically arranged with respect to the vertical plane where the center line of the support roller 1 is located.

[0035] The support roller 1 includes a first steel substrate 11 and a first coating 12, wherein the first coating 11 covers the surface of the first steel substrate 12;

[0036] The curved bottom roller 2 includes a second steel substrate 21 and a second coating 22. The second steel substrate 21 is symmetrically arranged with respect to the vertical plane where the center line of the first steel substrate 11 is located, and the second coating 22 covers the surface of the second steel substrate 21.

[0037] The metallographic structure of both the first coating 12 and the second coating 22 includes martensite 31 and alloy carbide 32; the alloy carbide 32 includes carbides of Co, Cr, Mo and Si, wherein the first coating 11 and the second coating 12 are both coatings provided by Beijing Continental Tianrui Laser Engineering Technology Co., Ltd.

[0038] As an optional implementation, the roller surface of the curved bottom roller 2 is curved, and the diameter of the curved surface is 500mm to 1000mm.

[0039] In this application, the positive effect of the curved bottom roller 2 having a curved surface is that after the strip steel passes through the edge trimming, the burr direction is downward. Therefore, the bottom roller of the deburring roller mainly plays the role of deburring. If the bottom roller surface of the deburring roller is flat, not only will the wear amount be large, but it will also easily cause bright edge defects in the strip steel.

[0040] The positive effect of a curved surface diameter of 500mm to 1000mm is that within this diameter range, the strip, except for the edge, can avoid contact with the roll surface. If the diameter is too large, the adverse effect is that the strip, except for the edge, may contact the roll surface, affecting the deburring effect of the deburring roll. If the diameter is too small, the adverse effect is that the curvature of the curved surface is too large, resulting in poor edge pressing effect.

[0041] When in use, place the product to be deburred between the support roller 1 and the curved bottom roller 2, with the two opposite sides of the product placed at the center of the two curved bottom rollers 2 respectively. Start the machine and perform the deburring process.

[0042] As an optional implementation, the thickness of both the first coating 12 and the second coating 22 is 150μm to 180μm.

[0043] In this application, the positive effect of the thickness of the first and second coatings being 150μm to 180μm is that the alloy carbides and martensite can be fully mixed and overlapped within this thickness range, resulting in the best hardness and wear resistance of the coating. When the thickness range is too large, the adverse effect is that the thickness is too thick, the raw materials for the laser cladding process increase, leading to increased production costs. When the thickness range is too small, the adverse effect is that the coating thickness is insufficient, the alloy carbides and martensite cannot be fully mixed and overlapped, resulting in poor coating thickness and wear resistance, and poor deburring effect.

[0044] As an optional implementation, the metallographic structure of both the first coating 12 and the second coating 22, by volume fraction, comprises: lamellar martensite 31: 85% to 95% and alloy carbides 32: 5% to 15%.

[0045] In this application, the positive effect of having a volume fraction of 85% to 95% lamellar martensite 31 is that within this volume fraction range, the lamellar martensite structure can enable the coating to meet the design requirements for hardness and strength. When the volume fraction value is too large, the adverse effect is that the volume fraction of alloy carbide structure is too small, resulting in poor wear resistance of the coating. When the volume fraction value is too small, the adverse effect is that the volume fraction of martensite structure is too small, resulting in insufficient hardness and strength of the coating.

[0046] The positive effect of having a volume fraction of alloy carbide 32 of 5% to 15% is that within this volume fraction range, the alloy carbide structure can enable the coating to meet the design requirements for wear resistance, while the lamellar martensite provides sufficient strength and hardness. When the volume fraction value is too large, the adverse effect is that the volume fraction of martensite is too small, resulting in insufficient coating hardness and strength. When the volume fraction value is too small, the adverse effect is that the volume fraction of alloy carbide is too small, resulting in poor wear resistance of the coating.

[0047] In one embodiment of this application, such as Figure 1 As shown, a method for preparing a deburring roller includes:

[0048] S1. Obtain the first steel base 11 of the support roller 1 or the second steel base 21 of the curved bottom roller 2;

[0049] S2. Obtain coating raw materials;

[0050] S3. The coating material is laser-fused onto the surface of the first steel substrate 11 or the second steel substrate 21 to obtain a support roller 1 with a first coating 12 or a curved bottom roller 2 with a second coating 22;

[0051] S4. Install and fix the support roller 1 or the curved bottom roller 2 to obtain the deburring roller.

[0052] As an optional implementation, the atmosphere for laser cladding is an argon atmosphere.

[0053] In this application, the positive effect of using an argon atmosphere for laser cladding is that the deburring roller is a thin-walled sleeve roller, which is prone to deformation and structural defects during hot processing. It is also sensitive to the processing methods of the first coating 12 and the second coating 22. Therefore, laser cladding is chosen to increase the hardness and wear resistance of the substrate by utilizing the secondary hardening effect during the heat treatment process of the laser cladding stage. In addition, laser cladding also has excellent properties such as low dilution rate, small deformation and fine grain size. At the same time, the use of a good argon atmosphere for protection makes the cladding structural defects controllable and has good contact fatigue performance, thereby improving the deburring effect.

[0054] In one embodiment of this application, a deburring roller and an application of the deburring roller prepared by a method for preparing a deburring roller are provided. The application includes using the deburring roller to remove burrs from steel products after disc shearing.

[0055] As an optional implementation, the steel products include continuously annealed steel products and galvanized steel products.

[0056] As an optional implementation, the thickness of the steel product is 0.5mm to 2.5mm.

[0057] Example 1

[0058] like Figure 2 and Figure 3 As shown, a deburring roller consists of a support roller 1 and a curved bottom roller 2.

[0059] A curved bottom roller 2 is provided directly below the support roller 1, and the curved bottom roller 2 is symmetrically arranged with respect to the vertical plane where the center line of the support roller 1 is located.

[0060] The support roller 1 includes a first steel substrate 11 and a first coating 12, wherein the first coating 11 covers the surface of the first steel substrate 12;

[0061] The curved bottom roller 2 includes a second steel substrate 21 and a second coating 22. The second steel substrate 21 is symmetrically arranged with respect to the vertical plane where the center line of the first steel substrate 11 is located, and the second coating 22 covers the surface of the second steel substrate 21.

[0062] The metallographic structure of both the first coating 12 and the second coating 22 includes martensite 31 and alloy carbides 32; the alloy carbides 32 include carbides of Co, Cr, Mo and Si.

[0063] The roller surface of the curved bottom roller 2 is curved, and the diameter of the curved surface is 1000mm.

[0064] The coating thickness is 160μm.

[0065] By volume fraction, the metallographic structure of both the first coating 12 and the second coating 22 consists of: lamellar martensite 31:90% and alloy carbides 32:10%.

[0066] like Figure 1 As shown, a method for preparing a deburring roller includes:

[0067] S1. Obtain the first steel base 11 of the support roller 1 or the second steel base 21 of the curved bottom roller 2;

[0068] S2 obtains coating raw materials;

[0069] S3. The coating material is laser-fused onto the surface of the first steel substrate 11 or the second steel substrate 21 to obtain a support roller 1 with a first coating 12 or a curved bottom roller 2 with a second coating 22;

[0070] S4. Install and fix the support roller 1 or the curved bottom roller 2 to obtain the deburring roller.

[0071] The atmosphere for laser cladding is argon.

[0072] Example 2

[0073] Comparing Example 2 with Example 1, the difference between Example 2 and Example 1 is as follows:

[0074] The diameter of the curved surface is 500 mm.

[0075] The coating thickness is 150 μm.

[0076] By volume fraction, the metallographic structure of both the first coating 12 and the second coating 22 consists of: lamellar martensite 31: 85% and alloy carbides 32: 15%.

[0077] Example 3

[0078] Comparing Example 3 with Example 1, the difference between Example 3 and Example 1 is as follows:

[0079] The diameter of the curved surface is 700mm.

[0080] The coating thickness is 180μm.

[0081] By volume fraction, the metallographic structure of both the first coating 12 and the second coating 22 consists of: lamellar martensite 31: 95% and alloy carbides 32: 5%.

[0082] Comparative Example 1

[0083] Comparing Comparative Example 1 and Example 1, the difference between Comparative Example 1 and Example 1 is as follows:

[0084] The first coating 12 is a chrome-plated first coating 12.

[0085] Comparative Example 2

[0086] Comparing Comparative Example 2 with Example 1, the difference between Comparative Example 2 and Example 1 is as follows:

[0087] The bottom roller is a flat roller.

[0088] Comparative Example 3

[0089] Comparing Comparative Example 3 with Example 1, the difference between Comparative Example 3 and Example 1 is as follows:

[0090] The first coating 12 is a chrome-plated first coating 12, and the bottom roller type is a flat roller.

[0091] Comparative Example 4

[0092] Comparing Comparative Example 4 with Example 1, the difference between Comparative Example 4 and Example 1 is as follows:

[0093] Instead of using laser cladding, the first coating 12 is deposited by electroplating.

[0094] Comparative Example 5

[0095] Comparing Comparative Example 5 with Example 1, the difference between Comparative Example 5 and Example 1 is as follows:

[0096] The curved bottom roller 2 has a curved surface diameter of 1500 mm, which is outside the diameter range of this application.

[0097] Related experiments:

[0098] The deburring rollers obtained in Examples 1-3 and Comparative Examples 1-5 were collected, and the performance of each deburring roller was tested. The results are shown in Table 1.

[0099] Test methods for related experiments:

[0100] Service life: The deburring rollers were applied to the deburring production lines for steel products with thicknesses of 0.5mm, 1mm, 1.5mm, 2mm, and 2.5mm respectively. The time was recorded until the roller surface showed severe wear and pitting defects. The time was then stopped, and the average value was taken.

[0101] Deburring effect: The burr height was measured using a VHX-6000 deburring instrument.

[0102] Bright edge occurrence rate of strip steel: This is calculated by counting the total number of products on the production line and the number of products with bright edge defects. The bright edge occurrence rate is calculated as: (Number of products with bright edge defects / Total number of products) * 100

[0103] Table 1

[0104]

[0105] Detailed analysis in Table 1:

[0106] Service life refers to the time it takes for a deburring roller to become severely worn and develop pits and defects. The longer the service life, the better the wear resistance of the deburring roller.

[0107] Burr height refers to the height of burrs on the surface of the strip after being processed by the deburring roller. The lower the burr height, the higher the hardness of the deburring roller, and the better the deburring effect of the deburring roller.

[0108] The bright edge occurrence rate of strip steel refers to the probability that bright edges appear on both sides of the strip steel after deburring. The lower the occurrence rate, the better the deburring effect.

[0109] From the data in Examples 1-3, it can be seen that:

[0110] In the deburring roller structure of this application, the change in the diameter of the curved surface has little effect on the service life of the deburring roller, but has a significant effect on the height of the burrs after deburring.

[0111] The data from Comparative Examples 1-5 show that not using a curved bottom roller or having an excessively large curved diameter will affect the service life and have a significant impact on the burr height after deburring.

[0112] One or more technical solutions in the embodiments of this application have at least the following technical effects or advantages:

[0113] (1) The deburring roller provided in this application adopts a coating including martensite and various alloy carbides, which improves the hardness and wear resistance of the deburring roller, improves the deburring effect, and can completely eliminate the defects of bright edge of strip steel.

[0114] (2) The deburring roller provided in this application embodiment has been in good condition for more than 9 months. Although the roller surface is worn, there are no pits or defects, which will not affect the deburring effect, nor will there be any foreign matter adhering and damaging the strip steel.

[0115] (3) The method provided in this application embodiment is to perform coating by laser cladding. On the basis of high carbon martensite, a variety of alloy carbides are introduced, which can improve the hardness and wear resistance of the deburring roller. Furthermore, due to the protection of the argon atmosphere, the defects of the cladding structure can be controlled, so that the deburring roller also has good contact fatigue performance.

[0116] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0117] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A deburring roller, characterized in that, The deburring roller includes a support roller and a curved bottom roller; A curved bottom roller is provided directly below the support roller, and the curved bottom roller is symmetrically arranged with respect to the vertical plane where the center line of the support roller is located; The support roller includes a first steel substrate and a first coating, wherein the first coating is applied to the surface of the first steel substrate by laser cladding. The curved bottom roller includes a second steel substrate and a second coating. The second steel substrate is symmetrically arranged with respect to the vertical plane where the center line of the first steel substrate is located. The second coating is applied to the surface of the second steel substrate by laser cladding. The metallographic structure of the coating comprises martensite and alloy carbides; the alloy carbides comprise carbides of Co, Cr, Mo and Si. The roller surface of the curved bottom roller is curved, and the diameter of the curved surface is 500mm~1000mm; By volume fraction, the metallographic structure of both the first coating and the second coating comprises: lamellar martensite: 85%~95%, alloy carbides: 5%~15%; The thickness of both the first coating and the second coating is 150μm~180μm.

2. A method for preparing the deburring roller according to claim 1, characterized in that, The method includes: Obtain the first steel substrate of the support roller or the second steel substrate of the curved bottom roller; Obtain coating raw materials; The coating material is laser-fused onto the surface of the first steel substrate or the second steel substrate to obtain a support roller with a first coating or a curved bottom roller with a second coating. The support roller or the curved bottom roller is installed and fixed to obtain a deburring roller.

3. The method according to claim 2, characterized in that, The atmosphere for laser cladding is an argon atmosphere.

4. An application of the deburring roller according to claim 1, characterized in that, The application includes using the deburring roller to remove burrs from steel products after disc shearing.

5. The application according to claim 4, characterized in that, The thickness of the steel product is 0.5mm to 2.5mm.

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