Metal mold spraying launder for production of plate and strip working roller and preparation method of metal mold spraying launder

Abstract

The invention discloses a metal mold spraying launder for plate and strip working roller production and a preparation method of the metal mold spraying launder, and belongs to the field of roller manufacturing. The metal launder body is made of 20CrMnTi alloy steel and comprises the following chemical components in percentage by weight: 0.15 to 0.5 percent of C, 0.15 to 0.5 percent of Si, 0.6 to 1.8 percent of Mn, 0.70 to 1.80 percent of Cr, 0.03 to 0.40 percent of Ti and the balance of Fe and inevitable impurities; a lead powder coating layer is sprayed on the inner surface of the metal launder body. The prepared metal mold spraying launder can be directly used after spraying, clay sand molding and gas kiln drying are not needed, the labor intensity and the production cost are effectively reduced, and the product quality is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of roll manufacturing, and particularly relates to a metal type spraying flow channel for plate strip work roll production and a preparation method thereof. BACKGROUND

[0002] The flow channel is a basic flow guide tool in the casting and metallurgical industry, and its core function is to provide a safe and controllable flow channel for liquid metal (such as molten iron and molten steel) in a high-temperature environment. It is usually made of or lined with refractory materials, and is used to guide the molten liquid from the smelting equipment or ladle to the mold, casting mold or next process. The flow channel does not store molten liquid, which is different from the ladle; it is also not part of the mold, which is different from the sprue in the mold. Its main forms include fixed iron flow channel, movable pouring flow channel and multiple flow channels for distribution, and it is a key component to ensure precise delivery of molten liquid and smooth casting process.

[0003] In the prior art, such flow channels are usually made of clay sand or refractory materials such as knotted materials. The specific manufacturing process is as follows: first, place the flow channel base on the ground; then, the operator manually punches and compacts the uniformly mixed refractory material on the inner surface of the flow channel to form a lining layer; then, the surface of the clay sand lining layer is trimmed to be smooth, and a layer of lead powder paint is brushed; finally, the manufactured flow channel is placed in a coal gas drying kiln for drying treatment for use. In actual pouring operation, the flow channel is connected with the horn gate, and the outer layer of molten iron is introduced into the rotating centrifugal cold mold cavity through the horn-flow channel path.

[0004] However, the above-mentioned existing manufacturing and using process has many defects: first, the labor intensity is large and the production efficiency is low because the refractory material is completely compacted in the flow channel cavity by manual operation; second, the quality stability of the lining layer of the flow channel is poor and the performance is not uniform due to the influence of the quality fluctuation of the raw material and the difference in manual operation proficiency; third, the drying of the flow channel relies on the coal gas drying kiln, and when the kiln body fails, the lining layer cannot be fully dried, which affects the subsequent use; fourth, before pouring, individual flow channels are prone to local shedding due to insufficient lining strength, and need to be repaired on site, and the repaired parts are often wet and not dry, which will introduce gas or impurities if used directly for pouring, seriously affecting the product quality of the casting skin. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a metal type spraying flow channel for plate strip work roll production and a preparation method thereof, which can be used directly after spraying a lead powder coating layer, does not need to use clay sand molding and coal gas kiln drying, effectively reduces the labor intensity and production cost, and improves the product quality.

[0006] To solve the above technical problems, the technical scheme adopted by the present application is: A metal type spraying flow groove for strip working roll production comprises: an integrally formed metal flow groove body; the metal flow groove body is made of 20CrMnTi alloy steel, and the chemical composition of the 20CrMnTi alloy steel is as follows: C: 0.15-0.5%, Si: 0.15-0.5%, Mn: 0.6-1.8%, Cr: 0.70-1.80%, Ti: 0.03-0.40%, and the balance is Fe and inevitable impurities; and the inner surface of the metal flow groove body is sprayed with a lead powder coating layer.

[0007] Further improvement of the technical scheme of the present application is that the thickness of the lead powder coating layer is 0.5-2mm.

[0008] Further improvement of the technical scheme of the present application is that the metal flow groove body is integrally formed by casting.

[0009] Further improvement of the technical scheme of the present application is that the inner surface roughness of the metal flow groove body is Ra≤6.3μm.

[0010] Further improvement of the technical scheme of the present application is that the wall thickness of the metal flow groove body is 25-30mm.

[0011] A preparation method of a metal type spraying flow groove for strip working roll production comprises the following steps: Step 1: determining the size parameters of the metal flow groove body according to the roll specifications; Step 2: integrally forming the metal flow groove body by casting using 20CrMnTi alloy steel; Step 3: mechanically processing the inner surface of the metal flow groove body to achieve a roughness of Ra≤6.3μm; Step 4: spraying a 0.5-2mm thick lead powder coating layer on the inner surface of the metal flow groove body.

[0012] Further improvement of the technical scheme of the present application is that in step 2, the casting temperature is 1500-1600℃.

[0013] Further improvement of the technical scheme of the present application is that in step 3, the mechanical processing includes turning and polishing.

[0014] Thanks to the above technical scheme, the present application has the following technical progress: 1. The metal type spraying flow groove adopted by the present application can be put into production and used after completing the surface spraying of the lead powder coating layer, thereby saving the complex processes such as traditional clay sand molding and coal gas kiln drying, effectively reducing the labor intensity and energy consumption, significantly saving the production time and material cost, and having excellent process applicability and production economy.

[0015] 2、The metal type spraying flow groove provided by the application can effectively avoid the non-metallic inclusion problem caused by material erosion or coating peeling in the molten iron flow process, thereby significantly improving the internal quality and appearance quality of the castings, and providing reliable guarantee for the stability and improvement of the product physical quality. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor. Figure 1 is a front view of a metal type spraying flow groove for plate strip working roll production provided in an embodiment of the present application; Figure 2 is a left view of a metal type spraying flow groove for plate strip working roll production provided in an embodiment of the present application; Figure 3 is a top view of a metal type spraying flow groove for plate strip working roll production provided in an embodiment of the present application; Among them, 1, metal flow groove body; 1-1, connecting flange; 1-2, connecting plate; 1-3, flow port. DETAILED DESCRIPTION

[0017] It should be noted that the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device containing a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0018] The present application will be further described in detail below in combination with the drawings and embodiments: As Figure 1 , Figure 2 , Figure 3 shown, a metal type spraying flow groove for plate strip working roll production comprises: an integrally formed metal flow groove body 1; the metal flow groove body 1 is made of 20CrMnTi alloy steel, and the chemical composition of the 20CrMnTi alloy steel is as follows in terms of percentage by weight: C: 0.15-0.5%, Si: 0.15-0.5%, Mn: 0.6-1.8%, Cr: 0.70-1.80%, Ti: 0.03-0.40%, and the balance is Fe and inevitable impurities; a lead powder coating layer is sprayed on the inner surface of the metal flow groove body 1.

[0019] Specifically, the metal trough body 1 has a central flow channel inside. This flow channel starts from the inlet at the connecting flange 1-1, extends through the area of ​​the connecting plate 1-2, and terminates at the front outlet 1-3, forming a channel for the continuous flow of molten iron and its introduction into the centrifugal cooling cavity. The connecting flange 1-1 is located at the front end of the metal trough body 1 and is used to dock and fix with the horn structure. The connecting plate 1-2 is located behind the connecting flange 1-1 and serves as a transition and support. The outlet 1-3 is located at the front end of the metal trough body 1 and is used to introduce molten iron into the centrifugal cooling cavity.

[0020] Furthermore, the thickness of the lead powder coating layer is 0.5-2mm.

[0021] Furthermore, the metal flow channel body 1 is a cast integral structure.

[0022] Furthermore, the inner surface roughness Ra of the metal flow channel body 1 is ≤ 6.3 μm.

[0023] Furthermore, the wall thickness of the metal flow channel body 1 is 25-30mm.

[0024] A method for preparing a metal-mold spraying channel for strip and plate work roll production includes the following steps: Step 1: Determine the dimensional parameters of the metal flow channel body 1 according to the roll specifications; Step 2: Cast the metal flow channel body 1 in one piece using 20CrMnTi alloy steel; the casting temperature is 1500-1600℃.

[0025] Step 3: Machining (including turning and polishing) the inner surface of the metal flow channel body 1 to achieve a surface roughness of Ra≤6.3μm; Step 4: Spray a 0.5-2mm thick lead powder coating layer onto the inner surface of the metal flow channel body 1.

[0026] Specifically, a metal mold spray-coated flow channel for producing strip work rolls serves to transition the outer layer of molten iron through a horn-shaped mold into the centrifugal cooling mold cavity during production (connecting the metal mold spray-coated flow channel coated with lead powder to the horn; allowing the outer layer of molten iron to flow into the centrifugal cooling mold cavity via the horn-metal mold spray-coated flow channel; completing the pouring of the outer layer of molten iron for the strip work roll). The metal mold spray-coated flow channel, after being coated with a certain thickness of lead powder, can be used directly, eliminating the need for clay sand molding and shaping processes, thus reducing labor intensity. Simultaneously, the metal mold spray-coated flow channel is integrally formed, preventing the inclusion problem caused by molding sand falling into the molten iron during production, thereby improving product quality.

[0027] Different centrifuges produce rollers with different groove sizes. Metal spraying grooves of different specifications are designed according to the centrifuge specifications: the total length B of the metal groove body 1 is determined according to the roller body length; the outer diameter A of the metal groove body 1 is determined according to the roller main journal size.

[0028] Example 1 A metal-type spray coating channel for the production of strip work rolls, specifically for 1450mm hot continuous rolling work rolls. The total length of the flow channel is B=1200mm; the inlet diameter is A=φ180mm; the outlet width of flow outlets 1-3 is 150mm; the wall thickness is δ=25mm; the single service life is 15-18 times (3-5 times for the original clay sand mold), the iron oxide slag is reduced by 42%, and the defect rate of subcutaneous porosity in the roll is reduced by 65%.

[0029] Example 2: A metal-type spray coating channel for the production of strip work rolls, specifically for 2050mm cold rolling support rolls, has a total channel length B=1500mm; inlet diameter A=φ200mm; outlet width of outlets 1-3 is 180mm; and wall thickness δ=30mm. The benefits include: reduced replacement time to 1 / 3 of the original; reduced refractory material cost per ton of steel by 28 yuan; and reduced product inclusion defect rate from 1.2% to 0.3%.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A metal mold spray runner for strip work roll production, characterized by, The application relates to a metal runner body (1) which is integrally formed; the metal runner body (1) is made of 20CrMnTi alloy steel, and the chemical components of the 20CrMnTi alloy steel are as follows in percentage by weight: C: 0.15-0.5%, Si: 0.15-0.5%, Mn: 0.6-1.8%, Cr: 0.70-1.80%, Ti: 0.03-0.40%, and the balance is Fe and inevitable impurities; and the inner surface of the metal runner body (1) is sprayed with a lead powder coating layer. The thickness of the lead powder coating layer is 0.5-2 mm.

2. The metal spray-molding channel of claim 1, wherein The metal runner body (1) is integrally formed in a casting structure.

3. The metal spray-molding channel of claim 1, wherein, The inner surface roughness of the metal runner body (1) is less than or equal to 6.3 microns.

4. The metal spray-molding channel of claim 1 wherein, The wall thickness of the metal runner body (1) is 25-30 mm.

5. The metal spray-molding channel of claim 1 wherein, The application further discloses a manufacturing method of the metal runner body (1).

6. A method of producing a metal spray-chute according to any one of claims 1-5, characterized in that Step 1: determining the size parameters of the metal runner body (1) according to the roller specifications; Step 2: integrally forming the metal runner body (1) by casting 20CrMnTi alloy steel; Step 3: mechanically processing the inner surface of the metal runner body (1) so that the roughness is less than or equal to 6.3 microns; Step 4: spraying the inner surface of the metal runner body (1) with a 0.5-2 mm thick lead powder coating layer. In step 2, the casting temperature is 1500-1600 DEG C.

7. The method of claim 6, wherein, In step 3, the mechanical processing includes turning and polishing.

8. The method of claim 6, wherein, ​

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