Manufacturing equipment for casting slag ladle

Abstract

The utility model discloses casting slag ladle manufacturing equipment which comprises a ladle body, a trunnion, a ladle body reinforcing rib, a tank car fixing lug and a ladle bottom radian, the ultrasonic flaw detection percent of pass of the trunnion reaches 100% through an accurate trunnion pre-embedding device and a reasonable sand mould manufacturing process, and the structural strength and rigidity are enhanced through unique ladle body design and reinforcing rib layout. The bearing capacity is improved, deformation is reduced, and the service life is prolonged. In the aspect of the production process, the sand mold manufacturing mold is split by the horizontal center line of the tank car fixing lug, and sand mold manufacturing is efficiently and accurately completed; the box closing device is matched with the pouring system, smooth box closing pouring is guaranteed, the rejection rate is reduced, the production period is shortened, and the efficiency is improved. In the aspect of cost control, the equipment process is optimized, the yield is improved, the waste loss is reduced, meanwhile, equipment such as a sand mold manufacturing mold is durable, the maintenance cost is reduced, the safety accident risk caused by slag ladle faults during steelmaking slag conveying is effectively reduced, and the personnel safety and the production order are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of casting equipment technology, and in particular to a device for manufacturing casting slag pots. Background Technology

[0002] Slag is the collective term for the products formed when impurities in the metal materials (molten iron and scrap steel, etc.) are oxidized by oxidants during the steelmaking process, and then react with slag-forming agents and furnace lining through physicochemical reactions. Slag has a lower density than molten steel and usually covers the surface of the molten steel. During smelting, due to the generation of a large amount of gas, the molten pool is intensely stirred, and the slag and molten steel are often in a mixed state. The greater this mixing, the faster the refining effect of the slag on the molten steel. Due to the continuous reaction between slag and steel, the composition and properties of the slag constantly change during the smelting process, and the properties of the slag directly affect the final quality of the molten steel. There is a famous saying in the steelmaking industry: "Steelmaking is slag making." After smelting, before tapping the steel, the electric furnace equipment first discharges the slag, then taps the steel. The furnace tilts forward, pouring the slag on top of the molten steel into the slag pot. The slag pot contains hot molten slag, sometimes mixed with a small amount of molten steel. Overhead cranes transport slag ladles to the steel slag plant for centralized slag processing. If the trunnions of the slag ladles have defects exceeding the standard, cracks can easily appear during hoisting, causing the slag ladles to tilt or fall, resulting in safety accidents. Cast slag ladles are a type of smelting vessel. According to the national standard AQ7011-2018 Safety Rules for Hoisting High-Temperature Molten Metal, the trunnions of the ladles must undergo ultrasonic testing and meet JB / T5000.15-2007 Class II to be considered qualified. However, due to the inherent loose structure of casting, defects such as slag inclusions and shrinkage cavities are prone to occur. Previously, both the ladle body and trunnions of cast slag ladles were cast. The current design uses sand casting to create the cavity, and then the ladle body and trunnions are cast simultaneously after molten metal is injected. The trunnion with its groove is located within the tank body, and its axial connection with the tank sidewall forms a near 90° angle. This makes it prone to forming a thermal nodule at the connection point, an effect of the casting process. Poor heat dissipation and slow solidification contribute to shrinkage porosity and other defects. If an exposed riser is used in the casting riser design, the effective feeding distance at the trunnion location cannot be guaranteed, easily leading to shrinkage porosity, cracks, and coarse crystal structures, affecting the trunnion's strength. If a concealed riser is used, the manufacturing process becomes more difficult, especially increasing the time required for subsequent finishing and grinding, and the required strength for the trunnion cannot be guaranteed. The casting microstructure is unstable, with many defects. Ultrasonic testing shows a low pass rate of only 50%. If inclusions and excessive shrinkage cavities cause cracks, it could lead to safety accidents; the casting slag tank cannot guarantee safe operation. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a manufacturing device for casting slag pots.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A casting slag pot manufacturing equipment includes a pot body, trunnions, pot body reinforcing ribs, pot car fixing lugs, and pot bottom curvature. The pot body wall thickness gradually increases from the pot mouth to the pot bottom, with the pot mouth wall thickness being mm, the pot bottom wall thickness being mm, and the pot bottom curvature radius being mm. The trunnion embedded in the pot body has a groove structure, and the trunnion is circular around its perimeter and communicates with the pot body reinforcing ribs.

[0006] Preferably, the tank body is provided with tank body reinforcing ribs to improve the overall rigidity of the slag tank.

[0007] Preferably, the horizontal center line of the tank truck's fixing lugs is used as the parting surface for making a sand mold, and the four trunnions are pre-embedded in the casting sand mold. After casting, the trunnions are fused with the tank body.

[0008] The beneficial effects of this utility model are as follows:

[0009] 1. By employing a precise trunnion pre-embedded device and a reasonable sand mold manufacturing process, a perfect fusion between the trunnion and the tank body is ensured, resulting in a 100% ultrasonic flaw detection pass rate for the trunnion. This fundamentally guarantees the quality of key components of the slag tank, significantly reducing safety hazards caused by trunnion issues. The tank body's gradually thickening design from the mouth to the bottom, combined with an increased bottom radius of curvature to 1800mm and densely distributed reinforcing ribs effectively connecting to the trunnion, significantly enhances the overall structural strength and rigidity of the slag tank. This not only improves the slag tank's ability to withstand the weight and pressure of steel slag but also effectively resists various stresses during transportation, reducing the risk of deformation and damage, and extending the service life of the slag tank.

[0010] 2. The sand mold making process, using the horizontal center line of the tank car's fixed lug as the parting surface, is scientifically designed, convenient, and quick. In actual operation, it can quickly and accurately complete sand mold making, reducing errors in the production process and providing a solid foundation for subsequent mold assembly and pouring, greatly improving production efficiency. The high-precision guiding and clamping mechanism of the mold assembly device allows the upper and lower sand molds to be assembled quickly and accurately, and to fit tightly during pouring, effectively preventing problems such as sparking. Combined with a carefully designed pouring system, it ensures that the molten metal can fill the cavity evenly and stably, avoiding defects such as incomplete pouring and cold shuts, reducing scrap rates, shortening the production cycle of a single slag pot, and improving overall production efficiency.

[0011] 3. By optimizing equipment and processes, the yield of slag pots has been greatly improved, and the amount of scrap caused by casting defects has been reduced. This not only reduces the waste of raw materials, labor, and time costs, but also avoids the additional costs incurred due to scrap disposal, saving production costs for the company in multiple ways. The sand mold making molds are made of high-strength, wear-resistant, and high-temperature-resistant materials, and the overall equipment is rationally designed, enabling the equipment to maintain good performance and precision during long-term use, reducing the frequency of equipment repair and replacement, and lowering equipment maintenance costs.

[0012] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0013] Figure 1 A schematic diagram of the integrated casting and forging slag pot structure of the equipment for manufacturing casting slag pots proposed in this utility model;

[0014] Figure 2 This is a schematic diagram of the slag pot structure of a casting slag pot manufacturing equipment proposed in this utility model;

[0015] Figure 3 This is a schematic diagram of the trunnion reinforcement part of the manufacturing equipment for a casting slag pot proposed in this utility model.

[0016] Figure 4 A schematic diagram of the bottom structure of a casting slag pot for the manufacturing equipment proposed in this utility model.

[0017] Figure 5 This is a schematic diagram of the trunnion structure of a casting slag pot manufacturing equipment proposed in this utility model.

[0018] In the diagram: 1. Trunnion; 2. Tank body; 3. Tank body reinforcing rib; 4. Tank truck fixing lug; 5. Bottom curvature of the tank. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Example 1, referring to Figures 1 to 5A casting slag pot manufacturing equipment includes a pot body 2, a trunnion 1, a pot body reinforcing rib 3, a pot car fixing lug 4, and a bottom arc 5. The pot body 2 gradually thickens from the pot mouth to the pot bottom, with a pot mouth wall thickness of 100mm and a pot bottom wall thickness of 120mm. The bottom arc 5 has a radius of 1800mm. The part of the trunnion 1 embedded in the pot body has a groove structure, and the trunnion 1 is circular on all sides and communicates with the pot body reinforcing rib 3.

[0021] In this embodiment, the tank body 2 is provided with tank body reinforcing ribs 3 around its perimeter to improve the overall rigidity of the slag tank. The horizontal center line of the tank car fixing lug 4 is used as the parting surface to make a sand mold. The four trunnions 1 are pre-embedded in the casting sand mold. After pouring, the trunnions 1 are fused with the tank body 2.

[0022] Based on the above technical solution, the design drawings for the casting and forging slag tank body 2 are as follows (e.g.) Figure 2 (As shown), tank 2

[0023] The process involves using ZG20Mn alloy with titanium and rare earth elements, and trunnion 1 made from 16Mn free-forged steel ingots. Forgings with qualified flaw detection and achieving the required forging ratio are selected. First, the sand casting process for tank body 2 is designed according to the slag pot drawings. The sand mold is created using the horizontal centerline of the tank car fixing lug 4 as the parting surface. Trunnion 1, machined to be free of oil, rust, and moisture, is then pre-embedded in the sand mold. The grooved portion of trunnion 1 is embedded in the slag pot body, while the remaining portion protrudes. It is then fixed with molding sand and a core support, with the protruding part being a circular support. After assembling the mold, molten metal is poured into the tank body 2 cavity formed by the sand mold, encasing trunnion 1. After cooling, it becomes an integral part of the tank body 2. At this point, the forged trunnion 1 is equivalent to a non-fused chill. Because the thermal nodal circle at the connection between trunnion 1 and the side wall of tank 2 is smaller than the maximum diameter of trunnion 1, and the superheat of the liquid metal absorbed by the trunnion 1 embedded in the casting of tank 2 is less than the heat required for the surface of trunnion 1 or even the entire trunnion 1 to melt, the trunnion 1 embedded in the casting of tank 2 does not melt and forms an integral part with the side wall of tank 2. Figure 2 As shown, there are two trunnions 1, each trunnion 1 (as shown) Figure 4 , 5 As shown, the design features a structure with two bosses. The trunnion 1 has a diameter of 360mm, and the mounting boss of the trunnion 1 has a diameter of 660mm. This design increases the bonding force with the casting tank 2 during casting, ensuring that the trunnion 1 is firmly cast into the tank 2 after casting. Around the trunnion 1 (as shown...) Figure 3 As shown, the design incorporates cross-rib reinforcement to enhance the casting and forging bond strength between the trunnion 1 and the tank body 2; cross-ribs 3 are added around the tank body 2 (as shown). Figure 3As shown), the strength of the entire tank body 2 is increased, making it less prone to cracking. The wall thickness of tank body 2 is increased from 100mm at the mouth of the casting to 130mm at the bottom, improving the service life of the steel tank. The bottom diameter is increased to 1600mm, increasing the contact area between the tank body and the steel slag transport vehicle, improving stability during transportation. After the tank body 2 is cast, heat treatment is performed to eliminate casting stress. The trunnion 1 and the slag tank body 2 undergo positive tempering heat treatment in the furnace, which greatly improves the mechanical properties and hardness. After heat treatment, the toughness, plasticity and hardness of the trunnion are enhanced, and the service life is increased by more than 2 times. After heat treatment, ultrasonic testing is performed on the trunnion 1 and the tank body 2, and the pass rate is 100%.

[0024] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A manufacturing apparatus for a foundry slag pot, comprising a pot body (2), trunnions (1), pot body reinforcing ribs (3), pot car fixing lugs (4), and a bottom curvature (5), characterized in that, The wall thickness of the tank body (2) gradually increases from the mouth to the bottom. The wall thickness at the mouth is 100mm and the wall thickness at the bottom is 120mm. The radius of the bottom arc (5) is 1800mm. The part of the trunnion (1) embedded in the tank body has a groove structure. The trunnion (1) is circular and communicates with the tank body reinforcing rib (3). The horizontal center line of the tank car fixing ear (4) is used as the parting surface to make a sand mold. The four trunnions (1) are pre-embedded in the casting sand mold. After pouring, the trunnion (1) is fused with the tank body (2).

2. The equipment for manufacturing a foundry slag pot according to claim 1, characterized in that, The tank body (2) is provided with tank body reinforcing ribs (3) around its body to improve the overall rigidity of the slag tank.

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