A manufacturing method of a strip steel coiler roller bed side guide plate wear-resistant sheet

Abstract

A kind of manufacturing method of strip steel coiler roller bed side guide plate wear-resistant sheet belongs to strip steel manufacturing equipment field.The roller bed side guide plate wear-resistant sheet uses plain carbon steel base, the diameter of base is between 200-500mm, wear-resistant layer is welded using plasma cladding numerical control welding machine on base surface, ceramic alloy welding powder is used in welding machine, forms single-sided wear-resistant layer thickness 5-6mm thick, the hardness after annealing can reach 62-65HRC, compared with the hardness of previous wear-resistant sheet, the service life is greatly improved, downtime can not be stopped due to wear of wear-resistant plate, wear-resistant plate can be replaced during regular maintenance of other equipment, and enterprise production efficiency can be greatly improved.

Description

Technical Field

[0001] This invention relates to a manufacturing method, and more particularly to a method for manufacturing wear-resistant plates for the side guide plates of a strip steel coiler roller conveyor, belonging to the field of strip steel manufacturing equipment. Background Technology

[0002] Strip steel production involves rolling heated steel into sheet structures, which are then conveyed via conveyor rollers to a coiler for transport and storage. Before reaching the coiler, the strip steel experiences deviations on the conveyor rollers due to variations in thickness, roller pressure, and roller friction resistance during the forming process. To ensure straight-line transport, figure-eight guide rollers are added to both sides of the roller conveyor entrance, and wear-resistant side guide plates are installed on both sides. As the high-temperature strip steel is continuously conveyed, its deviation causes friction with the side guide plates, resulting in horizontal grooves on both sides. To prevent these grooves from cutting the side guide plates, periodic shutdowns are necessary for replacement. Frequent shutdowns for replacement not only reduce production efficiency but also require a large workforce for repairs. To mitigate the impact of side guide plate wear on strip steel production and reduce maintenance frequency, a patent publication number of CN is proposed. Patent 217018032 U discloses an improved side guide plate body device for a winding machine. In this patent, multiple circular notches are opened below the side guide plates on both sides of the roller conveyor, and circular wear-resistant plates are set in the circular notches. The wear-resistant plates are fixed on the rotating shaft and driven to rotate synchronously by a synchronous rotation mechanism, so as to achieve the purpose of synchronous friction and synchronous replacement of multiple wear-resistant plates. The wear-resistant plates described in this patent are made of 5Cr15MoV stainless steel, which has the characteristics of high toughness, wear resistance and good processing performance.

[0003] Patent No. 202022394395.1 discloses a side guide plate for a steel conveyor roller with adjustable wear-resistant pads. This patent discloses the mechanism of the wear-resistant pad angle rotation device, and also discloses that the wear-resistant pads can be used on both sides. The specific fixing method extends the service life of the wear-resistant pads and ensures the uniformity of wear-resistant pad replacement.

[0004] However, there is no best, only better. As for how to further improve the manufacturing cost of wear-resistant plates and reduce costs, this is the goal pursued by enterprises. Regarding existing wear-resistant plates, the 5Cr15MoV stainless steel used has a hardness of 57-60 HRC, which, despite its high wear resistance, still has the potential to further improve its service life. Its cost also needs to be reduced, and self-production is necessary. Existing wear-resistant plates must be discarded once replaced, requiring the 5Cr15MoV stainless steel to be scrapped from the inside out. They cannot be recycled or reused. Therefore, reducing costs, extending service life, achieving self-production, and reducing the capital tied up in spare parts are major challenges currently faced by manufacturers of side guide plates for strip coiler roller conveyors. Summary of the Invention

[0005] To address the challenges of improving wear resistance, extending service life, and reducing the waste of high-value materials caused by the disposal of existing wear-resistant sheets, this invention provides a method for manufacturing wear-resistant sheets for the side guide plates of strip coiler rollers. The aim is to further improve the hardness and service life of the wear-resistant sheets, reduce their manufacturing costs, achieve independent production of wear-resistant sheets, shorten the inventory cycle of spare parts, and free up capital.

[0006] The technical solution of this invention is: a method for manufacturing wear-resistant sheets for the side guide plates of a strip coiler roller conveyor. The wear-resistant sheets for the side guide plates of the roller conveyor use a steel substrate with a diameter between 200-500 mm. A wear-resistant layer is welded onto the surface of the steel substrate using a plasma cladding CNC welding machine. The welding machine uses ceramic alloy welding powder. The steps for manufacturing the wear-resistant layer are as follows:

[0007] A method for manufacturing a wear-resistant sheet for a side guide plate of a strip coiler roller, characterized in that: the wear-resistant sheet for the side guide plate of the roller uses a steel substrate with a diameter between 200-500mm; a wear-resistant layer is welded onto the surface of the steel substrate using a plasma cladding CNC welding machine; the welding machine uses ceramic alloy welding powder; and the steps for manufacturing the wear-resistant layer are as follows:

[0008] 1) Place the wear-resistant steel substrate on the platform of the plasma cladding CNC welding machine;

[0009] 2) Use the display screen of the plasma cladding CNC welding machine to program the welding path of the wear-resistant layer on the surface of the wear-resistant sheet;

[0010] 3) Welding;

[0011] (1) Weld twice on one side, with each weld thickness being 2.5-3mm and the thickness of the single-sided weld being 5-6mm;

[0012] (2) Weld the reverse side using the same process;

[0013] The wear-resistant pad has a pre-drilled hole in the center or the center position is not welded and then drilled. The diameter of the hole in the center position is 3±0.5mm.

[0014] 4) After welding, place the wear-resistant sheet in a clay mud with a temperature below 5°C. Grind the clay into powder and sieve it through a 200-mesh sieve. Dry the clay powder in a pan and freeze it in a refrigerator until it is below 5°C. Refrigerate the Coca-Cola in a refrigerator until it reaches 5-8°C. After taking it out, quickly stir it into a mud according to the weight ratio of clay to Coca-Cola of 1:(2-5). Add it to the quenching tank of the wear-resistant sheet and quickly take out the wear-resistant sheet after 15 minutes.

[0015] 5) The wear-resistant sheets taken out of the clay mud were allowed to cool naturally to room temperature;

[0016] 6) Perform surface grinding on a grinding machine to make the wear-resistant layer surface flat.

[0017] The ceramic alloy welding powder has the following composition by weight percentage:

[0018] Ti44.5-54.5%, Co 27.1-33.2%, W4.8-8.5%, Ni2.8-5.8%, Mo2.6-4.6%, Fe1-3%,

[0019] Al1-2%, Si0.8-1.2%, V0.63-1.12%, Mn0.59-1.15%, Cu0.43-0.72%, P0.017-0.023%, S0.017-0.023%, Nb0.0075-0.012%;

[0020] Furthermore, the steel substrate is made of Q235 ordinary carbon steel;

[0021] Furthermore, the wear-resistant layer of the wear-resistant sheet has a hardness of 62-65 HRC;

[0022] Furthermore, the welding trajectory on the wear-resistant sheet surface of the roller conveyor side guide plate consists of multiple concentric circle trajectories, multiple reciprocating horizontal movement trajectories, a spiral trajectory, and multiple vertical reciprocating movement trajectories, with the welding trajectories interconnected to form an integral welding surface.

[0023] The positive effects of this invention are as follows: By using a plasma cladding CNC welding machine to weld a wear-resistant layer onto a wear-resistant steel substrate, and then quenching it, the hardness can be increased from the original 57-60 HRC to 62-65 HRC. The rotation time of the wear-resistant plate can be extended by 4-6 hours. If each wear-resistant plate can rotate 20 times on one side, the service life can be extended by 3.3-5 days. The replacement time of the wear-resistant plate can be extended from about 25 days to about one month, and the double-sided service life can be extended to about 2 months. Compared with the previous general wear-resistant plate's service life of 15 days, this significantly improves the service life. Downtime can basically be avoided due to wear of the wear-resistant plate. The wear-resistant plate can be replaced during the regular maintenance of other equipment, which can greatly improve the production efficiency of enterprises. Attached Figure Description

[0024] Figure 1 Schematic diagram of various welding trajectories for wear-resistant plates with central holes.

[0025] Figure 2 Schematic diagram of various welding trajectories for wear-resistant plates with fixed holes.

[0026] Labeling explanation: 10-center hole, 11-front fixing hole, 12-back fixing hole, 13-welding trajectory. Detailed Implementation

[0027] The specific technical solutions of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] The technical solution of this invention is: a method for manufacturing wear-resistant sheets for the side guide plates of a strip coiler roller conveyor. The wear-resistant sheets are made of a steel substrate with a diameter between 200-500 mm. A wear-resistant layer is welded onto the surface of the steel substrate using a plasma cladding CNC welding machine. The welding machine uses ceramic alloy welding powder. The steps for manufacturing the wear-resistant layer are as follows:

[0029] 1) Place the wear-resistant steel substrate on the platform of the plasma cladding CNC welding machine;

[0030] 2) Use the display screen of the plasma cladding CNC welding machine to program the welding path of the wear-resistant layer on the surface of the wear-resistant sheet;

[0031] 3) Welding;

[0032] (1) Weld twice on one side, each weld is 2.5-3mm thick, and the thickness of the weld on one side is 5-6mm;

[0033] (2) Weld the reverse side using the same process;

[0034] The wear-resistant pad has a pre-drilled hole in the center or the center position is not welded. The diameter of the hole in the center position is 3±0.5mm. The wear-resistant pad is mainly fixed to the end of the synchronous rotating shaft. The center hole of both sides of the wear-resistant pad is countersunk and fixed with screws.

[0035] A wear-resistant plate fixing piece with a central hole is fixed to a fixing block position inside the side guide plate body. Since the side guide plate body has a synchronous rotating shaft parallel to the roller conveyor shaft, the synchronous rotating shaft cannot be mounted on the fixing block between the synchronous rotating shafts. The end of the synchronous rotating shaft can be utilized... Figure 1 The wear-resistant pad shown is a wear-resistant pad with an automatic rotation angle; Figure 2 The wear-resistant sheet shown has multiple front-side fixing countersunk holes 11 evenly arranged on its surface, and similarly, multiple back-side fixing countersunk holes 12 with the same spacing as the front side are arranged on its back side. To improve the strength of a single wear-resistant sheet, the back-side fixing holes 12 are positioned in the middle of the front-side fixing holes 11. The radii of the front and back fixing holes from the center of the wear-resistant sheet are equal. This type of wear-resistant sheet is a manually angle-changing wear-resistant sheet. Whether it is an automatically rotating or manually angle-changing wear-resistant sheet, its welding path mainly includes four types of welding paths: (a), (b), (c), and (d). Automatic welding is achieved by editing a CNC program.

[0036] 4) After welding, place the refractory sheet in a clay mud with Coca-Cola at a temperature below 5°C. Grind the clay into powder, sieve it through a 200-mesh sieve, and dry it in a pan. Store the clay in a freezer at a temperature below 5°C. Refrigerate the Coca-Cola at a temperature of 5-8°C. After taking it out, quickly stir it into a mud according to the weight ratio of clay to Coca-Cola of 1:2.5. Add the mud to the quenching tank of the wear-resistant sheet. After 15 minutes, quickly remove the wear-resistant sheet.

[0037] 5) The welded wear-resistant sheet removed from the loess mud was allowed to cool naturally to room temperature;

[0038] 6) Perform surface grinding on a grinding machine to make the wear-resistant layer surface flat. Due to the high hardness, the grinding time needs to be more than 8 hours.

[0039] The welding trajectory on the wear-resistant sheet surface of the roller conveyor side guide plate consists of multiple concentric circle trajectories, multiple reciprocating horizontal movement trajectories, spiral trajectories, and multiple vertical reciprocating movement trajectories, which are connected to each other to form an integral welding surface. Example

[0040] The ceramic alloy welding powder was tested on a steel substrate (carbon steel Q235) using a plasma cladding CNC welding machine with the following seven different components. After two layers of welding, the hardness of the samples reached the range of 60-62 HRC.

[0041]

[0042] Converse example:

[0043] Although Coca-Cola contains water, try mixing regular drinking water or purified water with loess to form mud.

[0044] The test results showed that the quenching effect of using cola loess mud could not be achieved, and the hardness was far from that of using cola loess mud, which could not meet the hardness required by the process.

[0045] Meanwhile, quenching tests were conducted using water, oil, cola, and water, oil, and loess mixed into mud. The hardness of the mud was far lower than that of the mud quenched with cola. Moreover, the surface finish of the wear-resistant sheet quenched with cola and loess was higher after grinding than that of the sheet quenched with water, oil, and the mud.

[0046] The plasma cladding CNC welding machine used in this embodiment, also known as a plasma powder cladding machine, is manufactured by Shanghai Duomu Industrial Co., Ltd. The main parameters of the equipment are as follows:

[0047]

[0048] Plasma powder cladding uses a plasma arc as a heat source. The high temperature generated by the plasma arc rapidly heats the alloy powder and the substrate surface, causing them to melt, mix, diffuse, and solidify together. After the plasma beam leaves, it cools rapidly, forming a high-performance alloy layer. This cladding process strengthens and hardens the surface of the part. Because the plasma arc has high arc temperature, high heat transfer rate, good stability, and strong controllability of penetration depth, the thickness, width, and hardness of the cladding layer can be freely adjusted within a certain range by adjusting relevant cladding parameters. After plasma powder cladding, a fusion interface is formed between the substrate material and the cladding material, resulting in high bonding strength. The cladding layer has a dense structure, good corrosion resistance and wear resistance. The dilution between the substrate material and the cladding material is reduced, and the changes in material properties are minimal. Using powder as the cladding material improves the selectivity of alloy design, especially enabling the successful cladding of refractory materials, improving the wear resistance, high-temperature resistance, and corrosion resistance of the workpiece. The DML-V03CD also boasts significant advantages in autogenous welding, featuring a bright arc, a long and slender arc column, strong penetration, and the ability to weld thin workpieces without beveling, thus shortening welding time. Its welding speed is 3-6 times faster than ordinary TIG welding. Due to the keyhole effect, it allows for single-sided welding with double-sided forming, enabling one-pass welding of 8mm plates.

[0049] The positive effects of this invention are as follows: By using a plasma cladding CNC welding machine to weld a wear-resistant layer onto the wear-resistant plate substrate, and then quenching it, the hardness can be improved from the original 57-60 HRC to 62-65 HRC. The rotation time of the wear-resistant plate can be extended by 4-6 hours. If each wear-resistant plate can rotate 20 times on one side, the service life can be extended by 3.3-5 days. The replacement time of the wear-resistant plate can be extended from about 25 days to about one month, and the double-sided service life can be extended to about 2 months. Compared with the previous general wear-resistant plate, which had a service life of 15 days, this invention significantly improves the service life. Downtime can be reduced to almost no downtime due to wear of the wear-resistant plate. The wear-resistant plate can be replaced during the regular maintenance of other equipment, which can greatly improve the production efficiency of enterprises.

Claims

1. A method for manufacturing wear-resistant plates for the side guide plates of a strip coiler roller conveyor, characterized in that: The wear-resistant sheet of the roller conveyor side guide plate uses a steel base with a diameter between 200-500mm. The wear-resistant layer is welded onto the surface of the steel base using a plasma cladding CNC welding machine. The welding machine uses ceramic alloy welding powder. The manufacturing steps of the wear-resistant layer are as follows: 1) Place the wear-resistant steel substrate on the platform of the plasma cladding CNC welding machine; 2) Use the display screen of the plasma cladding CNC welding machine to program the welding path of the wear-resistant layer on the surface of the wear-resistant sheet; 3) Welding; (1) Weld twice on one side, with each weld thickness being 2.5-3mm and the thickness of the single-sided weld being 5-6mm; (2) Weld the reverse side using the same process; The wear-resistant pad has a pre-drilled hole in the center or the center position is not welded and then drilled. The diameter of the hole in the center position is 3±0.5mm. 4) After welding, place the wear-resistant sheet in a clay mud with Coca-Cola at a temperature below 5°C. Grind the clay into powder and sieve it through a 200-mesh sieve. Dry the clay powder in a pan and freeze it in a refrigerator at a temperature below 5°C. Refrigerate the Coca-Cola at a temperature of 5-8°C. After taking it out, quickly stir it into a mud according to the weight ratio of clay to Coca-Cola of 1:(2-5). Add it to the quenching tank of the wear-resistant sheet and quickly remove the wear-resistant sheet after 15 minutes. 5) The wear-resistant sheets taken out of the clay mud were allowed to cool naturally to room temperature; 6) Perform surface grinding on a grinding machine to make the wear-resistant layer surface flat. The ceramic alloy welding powder has the following composition by weight percentage: Ti44.5-54.5%, Co 27.1-33.2%, W4.8-8.5%, Ni2.8-5.8%, Mo2.6-4.6%, Fe1-3%, Al1-2%, Si0.8-1.2%, V0.63-1.12%, Mn0.59-1.15%, Cu0.43-0.72%, P0.017-0.023%, S0.017-0.023%, Nb0.0075-0.012%.

2. The method for manufacturing a wear-resistant sheet for the side guide plate of a strip coiler roller conveyor according to claim 1, characterized in that: The steel base material is made of Q235 ordinary carbon steel.

3. The method for manufacturing a wear-resistant sheet for the side guide plate of a strip coiler roller conveyor according to claim 1, characterized in that: The wear-resistant layer of the wear-resistant sheet has a hardness of 62-65 HRC.

4. The method for manufacturing a wear-resistant sheet for the side guide plate of a strip coiler roller conveyor according to claim 1, characterized in that: The welding trajectory on the wear-resistant sheet surface of the roller conveyor side guide plate consists of multiple concentric circle trajectories, multiple reciprocating horizontal movement trajectories, spiral trajectories, and multiple vertical reciprocating movement trajectories, which are connected to each other to form an integral welding surface.

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