A method for preventing lateral bending during casting of a long strip cast product

Abstract

The application provides a long-strip-shaped casting preparation anti-side-bending pouring method, which comprises the following steps: step one, preparing a metal mold coating; step two, cleaning the metal mold; step three, spraying the coating on the cleaned metal mold; and step four, pouring the metal mold. The long-strip-shaped casting is poured by the metal mold pouring mode, so that the appearance of the poured long-strip-shaped casting is ensured to be free of casting defects and the internal structure is relatively dense, the side-bending phenomenon during pouring is prevented, the problem of safety accidents in the use process of the user is prevented, and in addition, silicon, manganese and magnesium are added in the alloy solution of the casting, so that the mechanical properties, heat resistance and corrosion resistance of the casting after pouring are improved, and the strengthening performance is good.

Description

Technical Field

[0001] This invention relates to the field of casting technology, specifically to a method for preventing lateral bending during the preparation of elongated castings. Background Technology

[0002] Castings are metal shaped objects obtained by various casting methods. They are objects with a certain shape, size and properties obtained by pouring, injecting, sucking or other casting methods into a pre-prepared mold after smelting liquid metal, cooling and then grinding.

[0003] Aluminum alloys have good casting properties. Due to their low melting point (the melting point of pure aluminum is 660℃, and the pouring temperature of aluminum alloys is generally around 730~750℃), they can be widely used in casting methods such as metal mold casting and pressure casting to improve the internal quality, dimensional accuracy, surface finish, and production efficiency of castings.

[0004] Existing long and narrow castings are usually produced using sand casting. However, due to insufficient filling capacity of the liquid metal or poor filling conditions, the molten metal stops flowing before the cavity is filled, resulting in incomplete casting. Incomplete casting prevents the casting from achieving a complete shape, causing localized lateral bending in the long and narrow casting. Based on this, the present invention provides an anti-lateral bending casting method for the preparation of long and narrow castings. Summary of the Invention

[0005] The purpose of this invention is to provide an anti-bending casting method for preparing elongated castings, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A method for preventing lateral bending during the preparation of elongated castings includes the following steps:

[0008] Step 1: Prepare the metallic coating;

[0009] Step two: Clean the metal mold;

[0010] Step 3: Apply coating to the cleaned metal mold;

[0011] Step four: Cast the metal mold.

[0012] Preferably, in step one, the coating components are sodium silicate, talc, zinc oxide, kaolin, and warm water, and the weight ratio of sodium silicate, talc, zinc oxide, kaolin, and warm water is 4:2:1.2:0.8:12. Then, the various raw materials are mixed together and then fed into a mixer for stirring and mixing. The uniformly mixed coating is filtered through a 400-mesh filter screen, and then the filtered coating is loaded into a spray gun for use.

[0013] Preferably, the stirring temperature is 50-70℃, the stirring speed is 100-200 r / min, and the stirring time is 30-40 min.

[0014] Preferably, in step two, the surface of the metal mold is first cleaned with an organic solvent, then dried, and then sandblasted.

[0015] Preferably, the cleanliness of the metal type treated by sandblasting is Sa2.5, and the surface roughness is 30-40μm.

[0016] Preferably, in step three, the metal mold is first preheated to 180-250°C, and then 3-5 layers of coating are sprayed onto the mold surface of the preheated metal mold cavity, metal core and gating and riser parts. After spraying, the mold is dried at 60-80°C for 55-65 minutes.

[0017] Preferably, the thickness of each layer of the coating is 30-40 μm, and the spray gun pressure is 1-1.8 MPa.

[0018] Preferably, in step four, the pouring step is as follows:

[0019] S1: Close the metal mold and clamp it with the clips;

[0020] S2: Preheat the crucible to 200-300℃, then add the aluminum block into the crucible to melt it, making the melting temperature 730℃. After the aluminum block melts, control the crucible temperature to 760-780℃.

[0021] S3: Remove the slag from the metal solution in S2, then add silicon, manganese and magnesium in a weight ratio of 10:1:1, and slowly mix them with the solution using a stirring rod.

[0022] S4: Preheat the metal mold to 400-450℃, keep the metal mold at a 75-85° tilt angle, peel off the oxide scale on the surface of the alloy solution, scoop the solution and pour it from the gating gate of the metal mold. When pouring, keep the flow rate of the solution entering the cavity following the principle of slow at first → medium fast → slow at last. At the same time, the tilt angle of the metal mold should be returned to the horizontal state smoothly and slowly until the gating gate of the metal mold is filled.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] This invention uses a metal mold casting method to cast elongated castings, thereby ensuring that the cast elongated castings have no casting defects in appearance and a relatively dense internal structure, preventing casting side bending and safety accidents during use. In addition, silicon, manganese, and magnesium are added to the alloy solution of the casting, which improves the mechanical properties, heat resistance, and corrosion resistance of the casting after casting, while also making it strong. Attached Figure Description

[0025] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] like Figure 1 The present invention discloses an anti-bending casting method for preparing elongated castings, comprising the following steps:

[0028] Step 1: Prepare the metallic coating;

[0029] Step two: Clean the metal mold;

[0030] Step 3: Apply coating to the cleaned metal mold;

[0031] Step four: Cast the metal mold.

[0032] In step one of this embodiment, the coating components are sodium silicate, talc, zinc oxide, kaolin, and warm water, and the weight ratio between sodium silicate, talc, zinc oxide, kaolin, and warm water is 4:2:1.2:0.8:12. Then, the various raw materials are mixed together and then fed into a mixer for stirring and mixing. The uniformly mixed coating is filtered through a 400-mesh filter screen, and then the filtered coating is loaded into a spray gun for use.

[0033] In this embodiment, the stirring temperature is 50-70℃, the stirring speed is 100-200r / min, and the stirring time is 30-40min.

[0034] In step two of this embodiment, the surface of the metal mold is first cleaned with an organic solvent, then dried, and then sandblasted.

[0035] In this embodiment, the cleanliness of the metal mold treated by sandblasting is Sa2.5, and the surface roughness is 30-40μm.

[0036] In step three of this embodiment, the metal mold is first preheated to 180-250°C. Then, 3-5 layers of coating are sprayed onto the mold surface of the preheated metal mold cavity, metal core and gating and riser area. After spraying, the mold is dried at 60-80°C for 55-65 minutes.

[0037] In this embodiment, the thickness of each coating layer is 30-40μm, and the spray gun pressure is 1-1.8MPa.

[0038] In step four of this embodiment, the pouring process is as follows:

[0039] S1: Close the metal mold and clamp it with the clips;

[0040] S2: Preheat the crucible to 200-300℃, then add the aluminum block into the crucible to melt it, making the melting temperature 730℃. After the aluminum block melts, control the crucible temperature to 760-780℃.

[0041] S3: Remove the slag from the metal solution in S2, then add silicon, manganese and magnesium in a weight ratio of 10:1:1, and slowly mix them with the solution using a stirring rod.

[0042] S4: Preheat the metal mold to 400-450℃, keep the metal mold at a 75-85° tilt angle, peel off the oxide scale on the surface of the alloy solution, scoop the solution and pour it from the gating gate of the metal mold. When pouring, keep the flow rate of the solution entering the cavity following the principle of slow at first → medium fast → slow at last. At the same time, the tilt angle of the metal mold should be returned to the horizontal state smoothly and slowly until the gating gate of the metal mold is filled.

[0043] Example 1:

[0044] This embodiment provides a method for preventing lateral bending during the preparation of elongated castings, comprising the following steps:

[0045] Step 1: Prepare the metallic coating;

[0046] Step two: Clean the metal mold;

[0047] Step 3: Apply coating to the cleaned metal mold;

[0048] Step four: Cast the metal mold.

[0049] In step one of this embodiment, the coating components are sodium silicate, talc, zinc oxide, kaolin, and warm water, and the weight ratio between sodium silicate, talc, zinc oxide, kaolin, and warm water is 4:2:1.2:0.8:12. Then, the various raw materials are mixed together and then fed into a mixer for stirring and mixing. The uniformly mixed coating is filtered through a 400-mesh filter screen, and then the filtered coating is loaded into a spray gun for use.

[0050] In this embodiment, the stirring temperature is 50℃, the stirring speed is 100r / min, and the stirring time is 30min.

[0051] In step two of this embodiment, the surface of the metal mold is first cleaned with an organic solvent, then dried, and then sandblasted.

[0052] In this embodiment, the cleanliness of the metal mold treated by sandblasting is Sa2.5, and the surface roughness is 30μm.

[0053] In step three of this embodiment, the metal mold is first preheated to 180°C, and then three layers of coating are sprayed onto the mold surface of the preheated metal mold cavity, metal core and gating and riser area. After spraying, the mold is dried at 60°C for 55 minutes.

[0054] In this embodiment, the thickness of each coating layer is 30 μm, and the spray gun pressure is 1 MPa.

[0055] In step four of this embodiment, the pouring process is as follows:

[0056] S1: Close the metal mold and clamp it with the clips;

[0057] S2: Preheat the crucible to 200°C, then add the aluminum block to the crucible to melt it, making the melting temperature 730°C. After the aluminum block melts, control the crucible temperature to 760°C.

[0058] S3: Remove the slag from the metal solution in S2, then add silicon, manganese and magnesium in a weight ratio of 10:1:1, and slowly mix them with the solution using a stirring rod.

[0059] S4: Preheat the metal mold to 400°C, keep the metal mold at a 75° tilt angle, peel off the oxide scale on the surface of the alloy solution, scoop the solution and pour it from the gating gate of the metal mold. When pouring, keep the flow rate of the solution entering the cavity following the principle of slow at first → medium fast → slow at last. At the same time, the tilt angle of the metal mold is smoothly and slowly returned to the horizontal state until the gating gate of the metal mold is filled.

[0060] Example 2:

[0061] This embodiment provides a method for preventing lateral bending during the preparation of elongated castings, comprising the following steps:

[0062] Step 1: Prepare the metallic coating;

[0063] Step two: Clean the metal mold;

[0064] Step 3: Apply coating to the cleaned metal mold;

[0065] Step four: Cast the metal mold.

[0066] In step one of this embodiment, the coating components are sodium silicate, talc, zinc oxide, kaolin, and warm water, and the weight ratio between sodium silicate, talc, zinc oxide, kaolin, and warm water is 4:2:1.2:0.8:12. Then, the various raw materials are mixed together and then fed into a mixer for stirring and mixing. The uniformly mixed coating is filtered through a 400-mesh filter screen, and then the filtered coating is loaded into a spray gun for use.

[0067] In this embodiment, the stirring temperature is 70℃, the stirring speed is 200r / min, and the stirring time is 40min.

[0068] In step two of this embodiment, the surface of the metal mold is first cleaned with an organic solvent, then dried, and then sandblasted.

[0069] In this embodiment, the cleanliness of the metal mold treated by sandblasting is Sa2.5, and the surface roughness is 40μm.

[0070] In step three of this embodiment, the metal mold is first preheated to 250°C, and then five layers of paint are sprayed onto the mold surface of the preheated metal mold cavity, metal core and gating and riser parts. After spraying, the mold is dried at 80°C for 65 minutes.

[0071] In this embodiment, the thickness of each coating layer is 40 μm, and the spray gun pressure is 1.8 MPa.

[0072] In step four of this embodiment, the pouring process is as follows:

[0073] S1: Close the metal mold and clamp it with the clips;

[0074] S2: Preheat the crucible to 300℃, then add the aluminum block into the crucible to melt it, making the melting temperature 730℃. After the aluminum block melts, control the crucible temperature to 780℃.

[0075] S3: Remove the slag from the metal solution in S2, then add silicon, manganese and magnesium in a weight ratio of 10:1:1, and slowly mix them with the solution using a stirring rod.

[0076] S4: Preheat the metal mold to 450°C, keep the metal mold at an 85° tilt angle, peel off the oxide scale on the surface of the alloy solution, scoop the solution and pour it from the gating gate of the metal mold. When pouring, keep the flow rate of the solution entering the cavity following the principle of slow at first → medium fast → slow at last. At the same time, the tilt angle of the metal mold is smoothly and slowly returned to the horizontal state until the gating gate of the metal mold is filled.

[0077] Example 3:

[0078] This embodiment provides a method for preventing lateral bending during the preparation of elongated castings, comprising the following steps:

[0079] Step 1: Prepare the metallic coating;

[0080] Step two: Clean the metal mold;

[0081] Step 3: Apply coating to the cleaned metal mold;

[0082] Step four: Cast the metal mold.

[0083] In step one of this embodiment, the coating components are sodium silicate, talc, zinc oxide, kaolin, and warm water, and the weight ratio between sodium silicate, talc, zinc oxide, kaolin, and warm water is 4:2:1.2:0.8:12. Then, the various raw materials are mixed together and then fed into a mixer for stirring and mixing. The uniformly mixed coating is filtered through a 400-mesh filter screen, and then the filtered coating is loaded into a spray gun for use.

[0084] In this embodiment, the stirring temperature is 60℃, the stirring speed is 150r / min, and the stirring time is 35min.

[0085] In step two of this embodiment, the surface of the metal mold is first cleaned with an organic solvent, then dried, and then sandblasted.

[0086] In this embodiment, the cleanliness of the metal mold treated by sandblasting is Sa2.5, and the surface roughness is 35μm.

[0087] In step three of this embodiment, the metal mold is first preheated to 220°C, and then four layers of coating are sprayed onto the mold surface of the preheated metal mold cavity, metal core and gating and riser parts. After spraying, the mold is dried at 70°C for 60 minutes.

[0088] In this embodiment, the thickness of each coating layer is 35 μm, and the spray gun pressure is 1.4 MPa.

[0089] In step four of this embodiment, the pouring process is as follows:

[0090] S1: Close the metal mold and clamp it with the clips;

[0091] S2: Preheat the crucible to 250°C, then add the aluminum block into the crucible to melt it, making the melting temperature 730°C. After the aluminum block melts, control the crucible temperature to 770°C.

[0092] S3: Remove the slag from the metal solution in S2, then add silicon, manganese and magnesium in a weight ratio of 10:1:1, and slowly mix them with the solution using a stirring rod.

[0093] S4: Preheat the metal mold to 425°C, keep the metal mold at an 80° tilt angle, peel off the oxide scale on the surface of the alloy solution, scoop the solution and pour it from the gating gate of the metal mold. When pouring, keep the flow rate of the solution entering the cavity following the principle of slow at first → medium fast → slow at last. At the same time, the tilt angle of the metal mold is smoothly and slowly returned to the horizontal state until the gating gate of the metal mold is filled.

[0094] Example 4:

[0095] This embodiment provides a method for preventing lateral bending during the preparation of elongated castings, comprising the following steps:

[0096] Step 1: Prepare the metallic coating;

[0097] Step two: Clean the metal mold;

[0098] Step 3: Apply coating to the cleaned metal mold;

[0099] Step four: Cast the metal mold.

[0100] In step one of this embodiment, the coating components are sodium silicate, talc, zinc oxide, kaolin, and warm water, and the weight ratio between sodium silicate, talc, zinc oxide, kaolin, and warm water is 4:2:1.2:0.8:12. Then, the various raw materials are mixed together and then fed into a mixer for stirring and mixing. The uniformly mixed coating is filtered through a 400-mesh filter screen, and then the filtered coating is loaded into a spray gun for use.

[0101] In this embodiment, the stirring temperature is 55℃, the stirring speed is 125r / min, and the stirring time is 33min.

[0102] In step two of this embodiment, the surface of the metal mold is first cleaned with an organic solvent, then dried, and then sandblasted.

[0103] In this embodiment, the cleanliness of the metal mold treated by sandblasting is Sa2.5, and the surface roughness is 33μm.

[0104] In step three of this embodiment, the metal mold is first preheated to 200°C, and then four layers of coating are sprayed onto the mold surface of the preheated metal mold cavity, metal core and gating and riser parts. After spraying, the mold is dried at 65°C for 58 minutes.

[0105] In this embodiment, the thickness of each coating layer is 33 μm, and the spray gun pressure is 1.2 MPa.

[0106] In step four of this embodiment, the pouring process is as follows:

[0107] S1: Close the metal mold and clamp it with the clips;

[0108] S2: Preheat the crucible to 225°C, then add the aluminum block to the crucible to melt it, making the melting temperature 730°C. After the aluminum block melts, control the crucible temperature to 765°C.

[0109] S3: Remove the slag from the metal solution in S2, then add silicon, manganese and magnesium in a weight ratio of 10:1:1, and slowly mix them with the solution using a stirring rod.

[0110] S4: Preheat the metal mold to 415°, keep the metal mold at a 78° tilt angle, peel off the oxide scale on the surface of the alloy solution, scoop the solution and pour it from the gating gate of the metal mold. When pouring, keep the flow rate of the solution entering the cavity following the principle of slow at first → medium fast → slow at last. At the same time, the tilt angle of the metal mold is smoothly and slowly returned to the horizontal state until the gating gate of the metal mold is filled.

[0111] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0112] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for preventing lateral bending during the preparation of elongated castings, characterized in that, Includes the following steps: Step 1: Prepare the metallic coating; Step two: Clean the metal mold; Step 3: Apply coating to the cleaned metal mold; Step four: Cast the metal mold; In step one, the coating components are sodium silicate, talc, zinc oxide, kaolin, and warm water, and the weight ratio of sodium silicate, talc, zinc oxide, kaolin, and warm water is 4:2:1.2:0.8:

12. Then, the various raw materials are mixed together and then fed into a mixer for stirring. The uniformly mixed coating is filtered through a 400-mesh filter and then loaded into a spray gun for use. The stirring temperature is 50-70℃, the stirring speed is 100-200 r / min, and the stirring time is 30-40 min; In step four, the pouring process is as follows: S1: Close the metal mold and clamp it with the clips; S2: Preheat the crucible to 200-300℃, then add the aluminum block into the crucible to melt it, making the melting temperature 730℃. After the aluminum block melts, control the crucible temperature to 760-780℃. S3: Remove the slag from the metal solution in S2, then add silicon, manganese and magnesium in a weight ratio of 10:1:1, and slowly mix them with the solution using a stirring rod. S4: Preheat the metal mold to 400-450℃, keep the metal mold at a 75-85° tilt angle, peel off the oxide scale on the surface of the alloy solution, scoop the solution and pour it from the gating gate of the metal mold. When pouring, keep the flow rate of the solution entering the cavity following the principle of slow at first → medium fast → slow at last. At the same time, the tilt angle of the metal mold should be returned to the horizontal state smoothly and slowly until the gating gate of the metal mold is filled.

2. The anti-bending casting method for preparing elongated castings according to claim 1, characterized in that, In step two, the surface of the metal mold is first cleaned with an organic solvent, then dried, and then sandblasted.

3. The anti-bending casting method for preparing elongated castings according to claim 2, characterized in that, The cleanliness of the metal mold treated by sandblasting is Sa2.5, and the surface roughness is 30-40μm.

4. The anti-bending casting method for preparing elongated castings according to claim 1, characterized in that, In step three, the metal mold is first preheated to 180-250°C. Then, 3-5 layers of coating are sprayed onto the mold surface of the preheated metal mold cavity, metal core and gating and riser area. After spraying, the mold is dried at 60-80°C for 55-65 minutes.

5. The anti-bending casting method for preparing elongated castings according to claim 4, characterized in that, The thickness of each layer of the coating is 30-40μm, and the spray gun pressure is 1-1.8MPa.

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