Crusher frame assembly for mining machinery and its casting method

Abstract

This invention relates to the field of large cast steel component manufacturing technology, and discloses a crusher frame assembly for mining machinery and its casting method. The frame assembly includes a cast steel body and a functionally graded reactive framework pre-placed within it, forming a metallurgically bonded structure. The framework is made of a refractory metal alloy and is divided into regions A and B. Region A is located at the core of heat accumulation in the casting and has a highly reactive coating on its surface; Region B extends outward from Region A and has a highly thermally conductive ceramic coating on its surface. The method includes preparing the framework, installing it in the mold cavity, and then pouring molten steel and performing heat treatment. This invention induces in-situ forced nucleation at the core of the casting through the highly reactive coating in Region A, and establishes an inside-out heat conduction path with the help of the highly thermally conductive coating in Region B, achieving sequential solidification of the casting. This effectively transfers defects such as shrinkage porosity and shrinkage cavities, improves the density and uniformity of the internal structure of the casting, and enhances the overall mechanical properties of the frame assembly.

Description

Technical Field

[0001] This invention relates to the field of large cast steel parts manufacturing technology, specifically to crusher frame assemblies for mining machinery and their casting methods. Background Technology

[0002] The frame of a crusher in mining machinery is a key structural component that bears the core impact and vibration loads of crushing operations. Its service environment is harsh, requiring the manufacturing materials to possess high strength, high toughness, and excellent fatigue resistance. These components typically feature complex structures, large external dimensions, and highly uneven wall thickness, and are usually produced using a sand casting process for cast steel.

[0003] When producing such large, thick-walled steel castings using traditional casting processes, the heat dissipation conditions are far worse in the thicker cross-sectional areas (i.e., hot spots) than in thinner-walled areas due to the concentrated molten metal. This results in a gentle temperature gradient from the mold surface to the geometric center during solidification, leading to extremely slow cooling in the central region. This uncontrolled solidification behavior makes the central region of the casting the last area for the liquid phase to solidify. During the solidification shrinkage stage, external feeding channels are often blocked by the solidified metal, preventing this region from receiving effective molten metal replenishment. Consequently, volumetric defects such as shrinkage porosity and shrinkage cavities form inside the casting.

[0004] Meanwhile, the slow cooling process provides kinetic conditions for dendrite coarsening and macroscopic elemental segregation, resulting in a final as-cast microstructure with coarse grains and uneven composition. These internal metallurgical defects significantly reduce the density and microstructure uniformity of the casting, thereby impairing the material's mechanical properties, particularly impact toughness and fatigue life, directly affecting the reliability and service life of the entire crusher. Existing technologies typically rely on large-sized risers for feeding, but this method has limited feeding efficiency for castings with extremely large cross-sectional dimensions and results in high metal consumption, low process yield, and heavy workload for subsequent riser cutting and grinding, increasing production costs and energy consumption.

[0005] Therefore, how to actively control the solidification process of large, thick-walled cast steel parts in order to improve their internal structure and properties is a technical challenge in this field. Summary of the Invention

[0006] The technical problem this invention aims to solve is that, in the existing technology, when manufacturing large, thick-walled cast steel parts, especially crusher frames for mining machinery, using traditional casting processes, the slow and uncontrolled cooling rate in the central area of ​​the thick cross-section easily leads to casting defects such as shrinkage porosity, shrinkage cavities, compositional segregation, and coarse grains. This results in insufficient density and uniformity of the internal structure of the casting, thus affecting the overall mechanical properties and service life of the crusher frame assembly. Furthermore, traditional processes rely on large risers for feeding, leading to material waste, high energy consumption, and long production cycles.

[0007] To solve the above-mentioned technical problems, the present invention provides a crusher frame assembly for mining machinery and its casting method.

[0008] The first aspect of the present invention provides a crusher frame assembly for mining machinery, comprising: a cast steel body and a functionally graded reactive skeleton.

[0009] The functionally graded reactive framework is pre-placed inside the cast steel body and forms a metallurgical bond with the cast steel body.

[0010] The volume of the functionally graded reactive skeleton accounts for 0.5-10% of the total volume of the crusher frame assembly for mining machinery.

[0011] The functionally graded reactive framework (FRP) is made of a molybdenum-based or tungsten-based refractory metal alloy, and is divided into regions A and B. Region A corresponds to the final solidification region determined by solidification simulation of the cast steel body, and region B extends from region A outwards from the cast steel body. Regions A and B are spatially different and do not overlap, and their surfaces are coated with different coatings.

[0012] The different coatings include:

[0013] A highly reactive coating is disposed on the surface of region A. The highly reactive coating is composed of barium nitrate, hexagonal boron nitride and lanthanum hexaboride, and has a thickness of 200-400 μm.

[0014] A high thermal conductivity ceramic coating is disposed on the surface of region B. The high thermal conductivity ceramic coating is composed of hexagonal boron nitride and lanthanum hexaboride, and has a thickness of 100-200 μm.

[0015] In one specific embodiment, the molybdenum-based or tungsten-based refractory metal alloy is a Mo-Ti-C alloy, which is composed of the following components by mass percentage: Mo 94-96%, Ti 3-5%, and C 0.5-1.0%.

[0016] In one specific embodiment, the highly reactive coating comprises, by dry weight percentage, the following components: 40-60% barium nitrate, 25-40% hexagonal boron nitride, and 5-10% lanthanum hexaboride.

[0017] In one specific embodiment, the high thermal conductivity ceramic coating comprises, by dry weight percentage, the following components: 65-80% hexagonal boron nitride and 10-25% lanthanum hexaboride.

[0018] The technical solution provided by the first aspect of the present invention achieves active control of the solidification process of the casting by pre-setting a functional gradient reaction skeleton inside the cast steel body.

[0019] Its mechanism of action is as follows: when the high-temperature cast steel molten steel comes into contact with the functionally graded reactive framework, the nitrates in the highly reactive coating located at the core of heat accumulation in the casting (area A) undergo a violent endothermic decomposition reaction, forcing the molten steel in this area to undergo local supercooling and preferential nucleation; at the same time, the latent heat of solidification and subsequent heat are rapidly conducted to the outside of the casting through the entire framework, especially along the B area with excellent thermal conductivity and its surface high thermal conductivity ceramic coating, thereby establishing a steep temperature gradient from the inside to the outside, guiding the solidification front to advance along a predetermined path.

[0020] This structural design enables sequential solidification of the casting, concentrating and driving defects such as shrinkage cavities and porosity to the riser region where they finally solidify, thereby obtaining a cast steel body with a dense internal structure and refined grains. At the same time, the functionally graded reactive framework, as a permanent internal component, also strengthens the cast steel body.

[0021] A second aspect of the present invention provides a casting method for a crusher frame assembly for mining machinery, used for casting the crusher frame assembly for mining machinery as described in any of the foregoing embodiments, comprising the following steps:

[0022] S1. Prepare a functionally graded reactive framework, wherein the functionally graded reactive framework is composed of a molybdenum-based or tungsten-based refractory metal alloy, and apply a reinforcing reactive coating to the surface of region A of the functionally graded reactive framework, and apply a high thermal conductivity ceramic coating to the surface of region B of the functionally graded reactive framework.

[0023] S2. Install the functionally graded reactive framework prepared in step S1 into the mold cavity;

[0024] S3. Molten cast steel with a furnace temperature of 1600-1640℃ is poured into the mold cavity equipped with the functional gradient reactive skeleton to form a casting.

[0025] S4. Heat treat the casting formed after solidification in step S3.

[0026] In one specific implementation, in step S1, the molybdenum-based or tungsten-based refractory metal alloy portion of the functionally graded reactive framework is additively manufactured by selective laser melting (SLM). The parameters of the SLM are: laser power 350-500W, laser scanning speed 800-1200mm / s, and powder layer thickness 30-50μm.

[0027] In one specific embodiment, step S1, the coating preparation step on the functionally graded reactive framework includes: preparing a strong reactive coating slurry containing a silica sol binder and a high thermal conductivity ceramic coating slurry; applying the strong reactive coating slurry and the high thermal conductivity ceramic coating slurry to regions A and B of the functionally graded reactive framework respectively using a zone spraying or dip coating method; and curing at 150-200°C for 2-3 hours.

[0028] In one specific embodiment, the silica sol adhesive is prepared by the following method: using tetraethyl orthosilicate as a precursor, hydrolysis and polycondensation reaction are carried out under hydrochloric acid catalysis, the molar ratio of each component in the reaction system is tetraethyl orthosilicate:water:anhydrous ethanol=1:(4-8):(15-25), and the reaction temperature is 50-70℃.

[0029] In one specific implementation, the pouring speed of the molten steel in step S3 is controlled at 80-150 kg / s.

[0030] In one specific embodiment, the heat treatment in step S4 is a low-temperature tempering treatment. The process of the low-temperature tempering treatment is as follows: heat the casting to 550-650°C, hold it at that temperature for 4-8 hours, and then cool it to room temperature at a cooling rate of 30-100°C / hour.

[0031] The technical solution provided by the second aspect of this invention, through the above steps, can stably manufacture the crusher frame assembly for mining machinery as described in the first aspect of this invention. This method, through precise digital design, additive manufacturing, and zoned coating technology, prepares a functionally graded reactive framework capable of actively regulating heat flow. In the subsequent casting process, this framework is used to precisely guide the solidification behavior of the casting, thereby fundamentally solving the technical problem that traditional processes cannot effectively control the internal quality of thick cross-sections.

[0032] This invention provides a crusher frame assembly for mining machinery and its casting method. It has the following beneficial effects:

[0033] 1. This invention achieves sequential solidification of the casting by setting up a functionally graded reactive framework and utilizing the highly reactive coating in zone A to induce in-situ forced nucleation at the core of heat accumulation in the casting. Furthermore, the high thermal conductivity ceramic coating in zone B establishes an inside-out heat conduction path. This method concentrates shrinkage porosity and other defects caused by volume shrinkage at the riser portion on the outside of the casting, thereby improving the density and uniformity of the internal structure of the cast steel body.

[0034] 2. This invention achieves efficient internal feeding through a functionally graded reactive framework, reducing reliance on large external risers. This reduces the total amount of molten steel required for casting and the workload of subsequent riser cutting. Simultaneously, the improved as-cast microstructure simplifies subsequent heat treatment processes. For example, the normalizing and tempering process can be replaced with a single tempering process, or the holding time for heat treatment can be shortened, thereby reducing energy consumption during production.

[0035] 3. The functionally graded reactive framework of this invention is designed based on the thermal and stress field analysis of the casting model. Its pre-positioning in the mold transforms the solidification of the casting from a passive, spontaneous cooling process into an actively controllable process guided by the framework network. The direction and rate of solidification front advancement are governed by the functional settings of regions A and B of the framework, thereby achieving deterministic control over the solidification behavior of large and complex castings. Detailed Implementation

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the specification of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0037] Experimental materials:

[0038] The main raw materials and reagents used in the following examples and comparative examples have the following sources and specifications. Reagents not specifically mentioned are all commercially available analytical grade or higher grade products.

[0039] Molybdenum powder, CAS: 7439-98-7;

[0040] Titanium powder, CAS: 7440-32-6;

[0041] Graphite powder, CAS: 7782-42-5;

[0042] Barium nitrate, CAS: 10022-31-8;

[0043] Hexagonal boron nitride, CAS: 10043-11-5;

[0044] Lanthanum hexaboride, CAS: 12008-21-8;

[0045] Tetraethyl orthosilicate, CAS: 562-90-3;

[0046] Hydrochloric acid, CAS: 7647-01-0.

[0047] Examples 1-3:

[0048] Example 1:

[0049] This embodiment provides a casting method for a crusher frame assembly for mining machinery.

[0050] Preparation of functionally graded reactive frameworks:

[0051] Additive manufacturing of the Mo-Ti-C alloy framework involves mixing molybdenum powder, titanium powder, and graphite powder in a mass ratio of 94:3:0.5 to prepare Mo-Ti-C alloy powder. To ensure powder uniformity, the powder in the above ratio is placed in a V-type mixer and mixed for 8 hours under argon protection. The uniformly mixed powder is then dried in a vacuum drying oven at 80°C for 4 hours for later use. First, casting engineering simulation software (such as ProCAST or AnyCasting) is used, inputting a 3D model of the crusher frame and predetermined casting process parameters to simulate the solidification process and accurately determine the final solidification region of the casting. Then, topology optimization design is performed on this final solidification region to generate a 3D network structure model with high specific surface area and interconnected pores. Additive manufacturing is then performed using a laser selective melting device under an argon protective atmosphere, based on this model. The topology-optimized 3D model is a 3D network structure with high specific surface area and interconnected pores, designed to ensure minimal obstruction to molten steel flow and maximum contact area with the molten steel. During additive manufacturing, the oxygen content is controlled below 100 ppm. Process parameters are set as follows: laser power 350 W, laser scanning speed 800 mm / s, and powder layer thickness 30 μm. After forming, stress-relief annealing is performed to obtain a refractory metal framework.

[0052] The silica sol binder was synthesized in a reaction vessel by mixing tetraethyl orthosilicate, water, and anhydrous ethanol in a molar ratio of 1:4:15, with hydrochloric acid added as a catalyst to adjust the pH to 2.0. The reaction was stirred at 50°C for 4 hours, followed by aging at room temperature for 24 hours to obtain the silica sol binder.

[0053] Preparation and application of functional coatings: Strong reactive coating slurry preparation: A powder mixture of 40% barium nitrate, 25% hexagonal boron nitride, and 5% lanthanum hexaboride (by dry weight percentage) was weighed and added to the prepared silica sol binder. High thermal conductivity ceramic coating slurry preparation: A powder mixture of 65% hexagonal boron nitride and 10% lanthanum hexaboride (by dry weight percentage) was weighed and added to the prepared silica sol binder. Using a zoned spraying method, the strong reactive coating slurry was applied to the surface of region A of the refractory metal framework, controlling the coating thickness to 200 μm; the high thermal conductivity ceramic coating slurry was applied to the surface of region B, controlling the coating thickness to 100 μm. After coating, the framework was cured at 150℃ for 2 hours to obtain the functionally graded reactive framework.

[0054] The integral casting of the crusher frame involves precisely installing the prepared functionally graded reactive framework into the mold cavity of the crusher frame. The framework is fixed in its predetermined position through pre-reserved positioning structures that engage with supporting pins within the mold cavity, preventing displacement or floating during subsequent pouring. Molten ZG25MnCr cast steel is heated to a furnace tapping temperature of 1600℃ and poured at a rate of 80 kg / s. After the casting solidifies and cools, sand removal is performed.

[0055] Finally, the casting is subjected to low-temperature tempering treatment. The process is as follows: heat to 550℃, hold for 4 hours, and then cool to room temperature at a cooling rate of 30℃ / hour.

[0056] Example 2:

[0057] This embodiment is basically the same as Embodiment 1, except that:

[0058] Additive manufacturing of Mo-Ti-C alloy framework: The mass ratio of molybdenum powder, titanium powder, and graphite powder is 95:4:0.75. The laser selective melting process parameters are set as follows: laser power 425W, laser scanning speed 1000mm / s, and powder layer thickness 40μm.

[0059] Synthesis of silica sol adhesive: The molar ratio of tetraethyl orthosilicate:water:anhydrous ethanol is 1:6:20, and the reaction temperature is 60℃.

[0060] Preparation and application of functional coatings: The dry weight composition of the highly reactive coating slurry is: 50% barium nitrate, 32.5% hexagonal boron nitride, and 7.5% lanthanum hexaboride. The coating thickness is controlled at 300 μm. The dry weight composition of the high thermal conductivity ceramic coating slurry is: 72.5% hexagonal boron nitride and 17.5% lanthanum hexaboride. The coating thickness is controlled at 150 μm. The curing process involves holding at 175℃ for 2.5 hours.

[0061] The crusher frame is integrally cast: the molten steel tapping temperature is 1620℃, and the pouring speed is 115kg / s. The low-temperature tempering process is as follows: heat to 600℃, hold for 6 hours, and then cool to room temperature at a cooling rate of 65℃ / hour.

[0062] Example 3:

[0063] This embodiment is basically the same as Embodiment 1, except that:

[0064] Additive manufacturing of Mo-Ti-C alloy framework: The mass ratio of molybdenum powder, titanium powder, and graphite powder is 96:5:1.0. The laser selective melting process parameters are set as follows: laser power 500W, laser scanning speed 1200mm / s, and powder layer thickness 50μm.

[0065] Synthesis of silica sol adhesive: The molar ratio of tetraethyl orthosilicate:water:anhydrous ethanol is 1:8:25, and the reaction temperature is 70℃.

[0066] Preparation and application of functional coatings: The dry weight composition of the highly reactive coating slurry is: 60% barium nitrate, 40% hexagonal boron nitride, and 10% lanthanum hexaboride, with a coating thickness controlled at 400 μm. The dry weight composition of the high thermal conductivity ceramic coating slurry is: 80% hexagonal boron nitride and 25% lanthanum hexaboride, with a coating thickness controlled at 200 μm. The curing process involves holding at 200℃ for 3 hours.

[0067] The crusher frame is integrally cast: the molten steel tapping temperature is 1640℃, and the pouring speed is 150kg / s. The low-temperature tempering process is as follows: heat to 650℃, hold for 8 hours, and then cool to room temperature at a cooling rate of 100℃ / hour.

[0068] Comparative Examples 1-3:

[0069] Comparative Example 1:

[0070] This comparative example uses a traditional casting process. The difference from Example 2 is that no functionally graded reactive framework is pre-placed during casting; instead, a large-sized riser designed using traditional methods is used for feeding. Furthermore, the heat treatment after solidification of the casting employs a normalizing followed by high-temperature tempering process. All other conditions, such as the grade of cast steel used and the mold, are the same.

[0071] Comparative Example 2:

[0072] The only difference from Example 2 is that the prepared refractory metal framework is not coated with any highly reactive coating or high thermal conductivity ceramic coating and is used directly in subsequent steps. All other steps and process parameters are exactly the same as in Example 2.

[0073] Comparative Example 3:

[0074] The only difference from Example 2 is that the highly reactive coating of Example 2 is applied to the entire surface of the refractory metal framework (including regions A and B), instead of the highly thermally conductive ceramic coating. All other steps and process parameters are exactly the same as in Example 2.

[0075] Test Example 1-2:

[0076] Test Example 1:

[0077] Performance Tests and Results:

[0078] To verify the actual effect of the technical solutions provided in the foregoing embodiments, performance tests were conducted on the crusher frame assemblies prepared in Examples 1-3 and Comparative Examples 1-3.

[0079] Test method:

[0080] Step 1: Sample Preparation Samples were cut from each crusher frame casting of Examples 1-3 and Comparative Examples 1-3. The sampling locations are specified as follows:

[0081] Sampling location 1: The final solidification area of ​​the casting, which is determined by solidification simulation and pre-set functional gradient reactive skeleton A area before casting.

[0082] Sampling location 2: In a non-critical thin-walled area of ​​the frame, far from the heat accumulation core. Specimens are fabricated from these two locations for internal defect detection and mechanical property testing, respectively.

[0083] Step 2: Internal defect detection was performed using an ultrasonic flaw detector, according to the GB / T7233.1-2009 standard, on the test block taken from sampling location 1. The rating level of internal defects for each test block was recorded, with Level I indicating compliance and Level II and above indicating defects requiring attention.

[0084] Step 3: Mechanical Property Testing. Materials taken from sampling locations 1 and 2 are processed into standard specimens. Tensile strength (Rm), yield strength (Rp0.2), and elongation at break (A) are tested on a universal testing machine according to GB / T228.1-2010 standard. Room temperature impact energy (AkV) is tested on a pendulum impact testing machine according to GB / T229-2020 standard. Each set of data is tested three times, and the average value is taken.

[0085] Test results:

[0086] The test data for the examples and comparative examples are summarized in Table 1 below.

[0087] Table 1. Results of Internal Defect Detection and Mechanical Property Testing

[0088]

[0089] As shown in Table 1, compared with Comparative Example 1 using the traditional process, Examples 1-3 using the technical solution of this invention improved the internal defect level in the hot spot core region from Level III to Level I, and all mechanical properties, especially the elongation after fracture and impact absorption energy reflecting the material's toughness, showed significant improvement. Meanwhile, the difference in mechanical properties between the hot spot core region and the thin-walled region in Examples 1-3 was significantly smaller than that in Comparative Example 1. This indicates that by using a pre-set functionally graded reactive skeleton, the internal quality of the thick cross-section of the casting was effectively controlled, achieving uniformity in the overall microstructure and properties of the casting.

[0090] The above test results directly correspond to the working mechanism of the technical solution. The functionally graded reactive framework used in this embodiment has region A corresponding to the final solidification area of ​​the casting, with a highly reactive coating on the surface of region A. Under the action of high-temperature molten steel, this coating undergoes endothermic decomposition, causing localized supercooling within the liquid metal, thus preferentially forming a large number of crystal nuclei in the central region of the casting, which is the most difficult to cool. Simultaneously, region B, extending outward from region A, has a highly thermally conductive ceramic coating. This structure constitutes a directional and efficient heat conduction path from the inside of the casting to the outside. These two parts work synergistically to establish a steep temperature gradient from the inside to the outside of the casting, driving the solidification process in a predetermined direction and ultimately driving volume shrinkage defects such as shrinkage porosity and shrinkage cavities to the external risers.

[0091] The results of Comparative Examples 2 and 3 further confirm the necessity of functional zone coatings. In Comparative Example 2, the uncoated metal skeleton only serves as a passive heat conduction channel and cannot force nucleation in the core area. Therefore, its ability to control solidification is limited, resulting in internal defects. In Comparative Example 3, a single highly reactive coating is used. Although it can also promote nucleation, the lack of an efficient heat conduction path in Zone B prevents the establishment of an effective directional solidification temperature field. Heat conduction is disordered, and therefore the final microstructure density and mechanical properties are inferior to those of the examples. This indicates that the combination of forced nucleation in Zone A and directional heat conduction in Zone B is key to obtaining thick-section castings with dense internal microstructure.

[0092] Test Example 2:

[0093] Comparison of process yield and heat treatment process:

[0094] To further verify the effectiveness of the technical solution of the present invention in terms of production process, the casting, riser weight and heat treatment process of Example 2 and Comparative Example 1 using traditional process were recorded and compared.

[0095] Test method:

[0096] After cleaning the sand, the castings of Example 2 and Comparative Example 1 were weighed and recorded as follows: After cutting away the riser, gating system, and other components (collectively referred to as the gating system), the gating system is weighed and recorded as [weight not specified]. The process yield η is calculated using the following formula:

[0097] Castings castings caps ;

[0098] The heat treatment processes used for both were also recorded.

[0099] Test results:

[0100] The comparison results of process parameters are summarized in Table 2 below.

[0101] Table 2. Comparison of Process Yield and Heat Treatment Processes

[0102]

[0103] As shown in Table 2, compared with Comparative Example 1, which uses traditional large-size risers for feeding, Example 2, employing the technical solution of this invention, significantly reduces the weight of its gating and riser system, and increases the process yield from 72.1% to 83.3%. This indicates that the present invention, through efficient internal feeding, reduces reliance on external risers, saving a significant amount of metal material. Furthermore, because the as-cast microstructure of Example 2 is improved, its subsequent heat treatment can employ a simpler, lower-temperature tempering process, replacing the more energy-intensive normalizing followed by high-temperature tempering required in Comparative Example 1, thereby reducing energy consumption during production.

Claims

1. A frame assembly for a crusher for a mining machine, characterised in that, include: Cast steel body; And a functionally graded reactive framework, wherein the functionally graded reactive framework is pre-positioned and metallurgically bonded to the cast steel body; The volume of the functionally graded reactive framework accounts for 0.5-10% of the total volume of the crusher frame assembly for mining machinery. The functionally graded reactive framework is made of molybdenum-based or tungsten-based refractory metal alloy. The functionally graded reactive framework is divided into region A and region B. Region A is the part corresponding to the final solidification region determined by solidification simulation of the cast steel body. Region B is the part extending from region A to the outside of the cast steel body. Different coatings are provided on the surfaces of region A and region B respectively. The different coatings include: A highly reactive coating is disposed on the surface of region A. The highly reactive coating is composed of barium nitrate, hexagonal boron nitride and lanthanum hexaboride, and has a thickness of 200-400 μm. A high thermal conductivity ceramic coating is disposed on the surface of region B. The high thermal conductivity ceramic coating is composed of hexagonal boron nitride and lanthanum hexaboride, and has a thickness of 100-200 μm.

2. The mine machinery breaker frame set according to claim 1, characterized in that, The molybdenum-based or tungsten-based refractory metal alloy is a Mo-Ti-C alloy, which is composed of the following components by mass percentage: Mo 94-96%, Ti 3-5%, and C 0.5-1.0%.

3. The mine machinery breaker frame set according to claim 1, characterized by, The highly reactive coating comprises, by dry weight percentage, the following components: 40-60% barium nitrate, 25-40% hexagonal boron nitride, and 5-10% lanthanum hexaboride.

4. The mine machinery breaker frame set according to claim 1, characterized by, The high thermal conductivity ceramic coating comprises the following components by dry weight percentage: 65-80% hexagonal boron nitride and 10-25% lanthanum hexaboride.

5. A casting method for a crusher frame assembly for mining machinery, characterized in that, The method for casting the crusher frame assembly for mining machinery according to any one of claims 1-4 includes the following steps: S1. Prepare a functionally graded reactive framework, wherein the functionally graded reactive framework is composed of a molybdenum-based or tungsten-based refractory metal alloy, and apply a reinforcing reactive coating to the surface of region A of the functionally graded reactive framework, and apply a high thermal conductivity ceramic coating to the surface of region B of the functionally graded reactive framework. S2. Install the functionally graded reactive framework prepared in step S1 into the mold cavity; S3. Molten cast steel with a furnace temperature of 1600-1640℃ is poured into the mold cavity equipped with the functional gradient reactive skeleton to form a casting. S4. Heat treat the casting formed after solidification in step S3.

6. The casting method for the crusher frame assembly for mining machinery according to claim 5, characterized in that, In step S1, the molybdenum-based or tungsten-based refractory metal alloy portion of the functionally graded reactive framework is additively manufactured by selective laser melting (SLM). The parameters of the SLM are: laser power 350-500W, laser scanning speed 800-1200mm / s, and powder layer thickness 30-50μm.

7. The casting method for the crusher frame assembly for mining machinery according to claim 5, characterized in that, In step S1, the coating preparation step on the functionally graded reactive framework includes: preparing a strong reactive coating slurry containing a silica sol binder and a high thermal conductivity ceramic coating slurry; applying the strong reactive coating slurry and the high thermal conductivity ceramic coating slurry to regions A and B of the functionally graded reactive framework respectively using a zone spraying or dip coating method; and curing at 150-200℃ for 2-3 hours.

8. The casting method for the crusher frame assembly for mining machinery according to claim 7, characterized in that, The silica sol adhesive is prepared by the following method: using tetraethyl orthosilicate as a precursor, hydrolysis and polycondensation reaction are carried out under hydrochloric acid catalysis. The molar ratio of each component in the reaction system is tetraethyl orthosilicate:water:anhydrous ethanol=1:(4-8):(15-25), and the reaction temperature is 50-70℃.

9. The casting method for the crusher frame assembly for mining machinery according to claim 5, characterized in that, In step S3, the pouring speed of the molten steel is controlled at 80-150 kg / s.

10. The casting method for the crusher frame assembly for mining machinery according to claim 5, characterized in that, The heat treatment in step S4 is a low-temperature tempering treatment. The process of the low-temperature tempering treatment is as follows: heat the casting to 550-650℃, hold it at that temperature for 4-8 hours, and then cool it to room temperature at a cooling rate of 30-100℃ / hour.

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