Wear-resistant alloy block, manufacturing method thereof and composite imbedding process

Abstract

The invention discloses a wear-resistant alloy block. The wear-resistant alloy block comprises the following chemical components in percentage by mass: 3.0-3.4% of C; 0.4% to 0.8% of Si; 0.8% to 1.2% of Mn; cr: 19.0% to 22.0%; 0.4% to 0.6% of Ni; 0.7% to 0.9% of Cu; 0.8% to 1.2% of Mo; p is less than or equal to 0.04%; s is less than or equal to 0.04%; and the balance Fe and trace elements. According to the wear-resistant alloy block, the manufacturing method of the wear-resistant alloy block and the composite imbedding process of the wear-resistant alloy block, the technical problems that an existing jaw plate is low in cost performance, and the wear-resistant alloy block falls off in the operation process of a jaw plate loading machine can be solved to a certain extent.

Description

Technical Field

[0001] The present application belongs to the technical field of alloy casting, and specifically relates to a wear-resistant alloy block and a manufacturing method thereof, and a composite inlay casting process. Background Art

[0002] The jaw crusher is responsible for the rough crushing of materials. The movable jaw plate and the fixed jaw plate are subjected to the impact wear of large pieces of materials and the erosion wear of fine-grained materials. Therefore, the jaw plate needs to have both high hardness and high toughness.

[0003] The mainstream jaw plates on the market are filled with wear-resistant alloy blocks in the jaw plate body, mainly using two processes, namely, the wear-resistant alloy block integral casting process and the wear-resistant alloy block inlay process. However, there are the following problems:

[0004] The first is the integrated casting process of wear-resistant alloy blocks: the alloy blocks are fixed in the sand mold and cast together with the jaw plate body. The wear-resistant alloy blocks used in this process are produced by powder metallurgy process, and the purchase price is about 120,000 yuan per ton. The high price of alloy blocks affects the cost performance of the jaw plate.

[0005] The second is the wear-resistant alloy block inlay process: after the alloy block is inlaid into the cavity of the jaw plate body, a thin steel plate is used to fill the gap between the two. This process uses a physical method to fix the alloy block. During the installation and operation of the jaw plate, the alloy block is prone to fall off, which affects the service life of the jaw plate. Summary of the invention

[0006] The present application aims to at least to some extent solve the technical problems of low cost performance of the existing jaw plate and alloy block falling off during the operation of the jaw plate. To this end, the present application provides a wear-resistant alloy block and a manufacturing method thereof, and a composite inlay casting process.

[0007] The technical solution of this application is:

[0008] One aspect of the present application provides a wear-resistant alloy block, the chemical composition mass percentage of which is:

[0009] C: 3.0%-3.4%; Si: 0.4%-0.8%; Mn: 0.8%-1.2%; Cr: 19.0%-22.0%; Ni: 0.4%-0.6%; Cu: 0.7%-0.9%; Mo: 0.8%-1.2%; P≤0.04%; S≤0.04%; the remainder is Fe and trace elements.

[0010] Another aspect of the present application provides a method for manufacturing a wear-resistant alloy block, comprising:

[0011] Pre-treating the molten iron;

[0012] The pretreated molten iron is subjected to a lost foam casting process to obtain an alloy block;

[0013] After the alloy block is shot blasted, heat treatment is performed to obtain the finished product.

[0014] Further, the pretreatment of the molten iron includes:

[0015] Add a slag remover to the molten iron in the furnace and remove the slag three times repeatedly, add 0.3% rare earth, stir the molten iron evenly, cool it to 1550℃~1560℃ and take it out of the furnace;

[0016] Clean the residual slag in the tapping trough and ladle before tapping;

[0017] After the iron is tapped, a slag remover is added into the ladle and the slag is removed repeatedly for three times. When the temperature is between 1470°C and 1480°C, the pretreated molten iron is poured by a traveling carriage.

[0018] Further, the pretreated molten iron is subjected to a lost foam casting process to obtain an alloy block, which includes:

[0019] Forming a foam mold of the alloy block;

[0020] Mixing the coating, applying the coating to the alloy block foam type, drying it and forming a modeling buried box;

[0021] The pretreated molten iron is poured to obtain an alloy block.

[0022] Further, mixing the coating, applying the coating to the alloy block foam type, drying and molding the embedded box include:

[0023] The mixed aggregate is a high-aluminum powder water-based paint. Pre-treat various raw materials, weigh them and add them according to the formula requirements. The mixing time is 2 hours to 4 hours, and it can be used immediately after mixing.

[0024] After the alloy block foam mold is dried thoroughly and the gate system is assembled, the surface is coated with paint. The coating is two layers. The second layer can be applied after the first layer is dried thoroughly. The total thickness of the paint is controlled to be 1.5 mm as much as possible after drying. The first layer of paint should be evenly and thoroughly applied. The paint is spread with a brush at the corners of the model. After drying, if local bubbles, missing paint or cracks are found, they should be repaired in time;

[0025] After applying the paint, the foam type drying time shall not be less than 12 hours;

[0026] The humidity in the paint drying room shall not be greater than 30°C, and the temperature shall be controlled at 40°C-50°C;

[0027] Determine the amount of sand intake and the depth of the bottom sand according to the total height of the alloy block foam mold and the size of the sand box;

[0028] Check all parts of the sand box and conduct a no-load operation test on the vibrating table. When you are sure everything is correct, add bottom sand to the sand box and vibrate it. The molding sand used during molding should not be higher than 40℃.

[0029] After adding sand and vibrating, make the upper surface of the sprue connection smooth, lay a plastic film, put the pouring cup in place and add a layer of protective sand on the film, and then transport the sand box to the pouring area to prepare for pouring.

[0030] Further, pouring the pretreated alloy block molten iron to obtain the alloy block comprises:

[0031] Before pouring, check whether the seal between the pouring cup and the plastic film is intact;

[0032] During pouring, the pretreated molten iron is rushed to the end away from the sprue to prevent the pretreated molten iron from rushing directly to the sprue;

[0033] While pouring, turn on the vacuum pump, with a negative pressure of 0.05Mpa, and stop extracting the vacuum 5 minutes after pouring.

[0034] After pouring for 2 hours, the alloy blocks were boxed.

[0035] Further, after the alloy block is subjected to shot blasting, heat treatment is performed to obtain a finished product, which includes:

[0036] The alloy block is subjected to shot blasting treatment;

[0037] After the alloy block is put into the resistance furnace, the temperature is raised to 200°C±10°C for 1 hour, the temperature is averaged at 200°C±10°C for 1 hour to eliminate thermal stress, the temperature is further raised to 650°C±10°C for 7 hours, the temperature is kept for 2 hours to prepare for quenching, the temperature is raised from 650°C±10°C to 920°C±10°C for 2.7 hours, the temperature is kept for 2 hours, and air cooling quenching is performed;

[0038] After the alloy block is quenched, it is tempered twice at 480°C±10°C and 300°C±10°C in sequence to obtain a finished product.

[0039] Another aspect of the present application provides a composite casting process for a wear-resistant alloy block, comprising:

[0040] Calculate the number and distribution spacing of the wear-resistant alloy blocks on the tooth surface of the jaw plate;

[0041] After the movable jaw plate body, the fixed jaw plate body and the wear-resistant alloy block are heat-treated respectively, the wear-resistant alloy block is embedded in the tooth surface cavities of the movable jaw plate body and the fixed jaw plate body;

[0042] After the inlay quality meets the standard, high-strength resin glue backing filler is filled in the assembly gap between the movable jaw plate body, the fixed jaw plate body and the wear-resistant alloy block. After standing for 24 hours, the wear-resistant alloy block and the movable jaw plate body and the fixed jaw plate body are firmly bonded into a whole.

[0043] Furthermore, the height dimension of the wear-resistant alloy block is consistent with the depth dimension of the cavity cast on the tooth surface of the movable jaw plate body and the fixed jaw plate body, and the top arc surface dimension of the wear-resistant alloy block is consistent with the curvature dimension of the tooth surface of the movable jaw plate body and the fixed jaw plate body. The wear-resistant alloy block is inserted into the tooth surface cavity of the movable jaw plate body and the fixed jaw plate body, and the working surface of the wear-resistant alloy block is consistent with the R25 arc surface of the tooth top and the 15° inclined surfaces on both sides of the movable jaw plate body and the fixed jaw plate body. The wear-resistant alloy block is cast based on the tooth surface of the movable jaw plate body and the fixed jaw plate body, and the height deviation is controlled within ±2mm.

[0044] Further, the height of the wear-resistant alloy block is 100 mm ± 5 mm, and the width of the wear-resistant alloy block is 64 mm ± 5 mm;

[0045] The tooth surface cavity clearance between the wear-resistant alloy block and the movable jaw plate body and the fixed jaw plate body is 4mm±1mm, and the spacing between the wear-resistant alloy blocks is 20mm±3mm.

[0046] The embodiments of the present application have at least the following beneficial effects:

[0047] The embodiments of the present application provide a wear-resistant alloy block and a production method thereof, as well as a composite inlay casting process. By adopting a lost foam casting process to replace a powder metallurgy process for mass production of alloy blocks, the production cost of the alloy blocks is reduced by 75%, thereby improving the cost performance of the jaw plate. By adopting the composite inlay casting process, the high hardness of the alloy block and the high strength and toughness of the ultra-high manganese steel jaw plate body can be organically combined, thereby solving the problem of alloy block falling off during the installation and operation of the jaw plate, and realizing long-term stable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0049] Figure 1 A schematic diagram of the composite inlay casting process for the front face of the jaw plate tooth profile provided in Example 1 of the present application;

[0050] Figure 2 A schematic diagram of the composite inlay casting process for the tooth-shaped side of the jaw plate provided in Example 1 of the present application;

[0051] Reference numerals:

[0052] 1-moving jaw plate body; 2-fixed jaw plate body; 3-wear-resistant alloy block, 4-high-strength resin rubber backing filler. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0054] In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but those of ordinary skill in the art may recognize the application of other processes and / or the use of other materials.

[0055] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0056] Embodiment 1

[0057] One aspect of the present application provides a wear-resistant alloy block, which is made of high-chromium wear-resistant white cast iron, adjusts the carbon and chromium content, and adds nickel, molybdenum, and copper alloy elements. The chemical composition mass percentage is: C: 3.0%-3.4%; Si: 0.4%-0.8%; Mn: 0.8%-1.2%; Cr: 19.0%-22.0%; Ni: 0.4%-0.6%; Cu: 0.7%-0.9%; Mo: 0.8%-1.2%; P≤0.04%; S≤0.04%; the remainder is Fe and trace elements.

[0058] The carbon content design should ensure that the wear resistance and toughness of the casting are organically matched. Wear resistance increases with the increase of carbon content. When it increases to a certain value, the wear resistance is optimal. The further increase of carbon content, the wear resistance gradually decreases. If the carbon content is too high, the carbides are coarse and the number increases, which reduces the toughness. If the carbon content is too low, the carbides are distributed in a network along the grain boundaries, which is also not conducive to toughness and wear resistance. The carbon content determines the number and shape of carbides, thereby affecting the wear resistance and toughness of the casting. The carbon content is determined to be 3.0% to 3.4%.

[0059] Silicon dissolves in the solid phase and produces a solid solution strengthening effect on the matrix, which helps to improve the wear resistance of the material. Silicon reduces the critical cooling rate of chromium-rich austenite, which is beneficial to improve hardenability. Silicon increases the Ms point of high-chromium cast iron, which helps to increase the amount of martensite structure transformation and reduce the amount of residual austenite in the cast or quenched structure. Silicon narrows the temperature range of the eutectic reaction, making the eutectic carbide smaller and more dispersed. The silicon content is controlled between 0.4% and 0.8%.

[0060] Chromium is the main alloying element in high-chromium wear-resistant cast iron and is a strong carbide-forming element. The chromium content should be designed to ensure a complete white structure, prevent the generation of free graphite, increase the microhardness of carbides, strengthen the matrix structure, and achieve the goal of improving wear resistance. The chromium content is controlled at 19% to 22%.

[0061] Manganese can enter carbides in high chromium cast iron and dissolve in the matrix. An appropriate amount of manganese is beneficial for improving toughness, hardenability and wear resistance. When manganese and molybdenum are used together, it has a good effect on improving hardenability. The manganese content is controlled at 0.8-1.2%.

[0062] Molybdenum has the following main functions in high chromium cast iron: First, it improves the hardenability and Ms point of high chromium cast iron, produces sufficient martensite structure after quenching, reduces the amount of residual austenite in the room temperature structure, and obtains higher quenching hardness. Second, it forms fine grains to improve the strength and toughness of castings. Third, molybdenum forms a stable carbide phase with carbon elements, or dissolves in chromium-carbon compounds to enhance the wear resistance of the material. The molybdenum content is controlled at 0.8% to 1.2%.

[0063] Nickel promotes the austenite transformation of high chromium cast iron, improves toughness and reduces residual stress inside the casting. The nickel content is controlled at 0.4% to 0.6%.

[0064] Copper can improve corrosion resistance, wear resistance and strength, and its content is controlled at 0.7% to 0.9%. Sulfur and phosphorus are harmful elements in high chromium cast iron, and are both controlled below 0.04%.

[0065] Another aspect of the present application provides a method for manufacturing a wear-resistant alloy block, comprising:

[0066] Step S1: pre-treating the alloy block molten iron;

[0067] Step S2: obtaining alloy blocks by using the pretreated molten iron through a lost foam casting process;

[0068] Step S3: After the alloy block is shot blasted, heat treatment is performed to obtain a finished product.

[0069] Wherein, step S1 pre-treating the alloy block molten iron comprises:

[0070] Step S11: Add slag remover to the molten iron in the furnace and remove slag three times repeatedly to ensure the purity of the molten iron and eliminate slag inclusion defects. After adding 0.3% rare earth, stir the molten iron evenly, cool it to 1550℃~1560℃ and take it out of the furnace. Rare earth elements have a significant effect on the transformation of high chromium white cast iron structure, which can refine grains, optimize carbide morphology and distribution, and improve mechanical properties and wear resistance. Control the temperature of molten iron out of the furnace to ensure that the pouring temperature reaches the predetermined value after tapping.

[0071] Step S12: Clean the residual slag in the iron tapping trough and the iron ladle before tapping to prevent the slag from mixing into the molten iron and causing casting defects.

[0072] Step S13: Add a slag remover into the ladle after the iron is tapped and remove the slag three times repeatedly to ensure the purity of the molten iron and eliminate slag inclusion defects. When the temperature is 1470℃-1480℃, the pretreated molten iron is poured by a mobile carriage. The appropriate pouring temperature can ensure that the alloy block is well formed and avoid defects such as cold shut, insufficient pouring, and sand sticking in the alloy block due to inaccurate pouring temperature.

[0073] In step S2, the pretreated alloy block molten iron is subjected to a lost foam casting process to obtain an alloy block. The process flow includes three parts: a white area, a yellow area, and a black area, which are respectively described as follows:

[0074] Step S21: The white area is mainly used for alloy block foam molding, including:

[0075] ⑴ Review drawings, determine scale, calculate runner dimensions, and complete process drawing design.

[0076] ⑵ Make samples according to the requirements of process drawings.

[0077] ⑶ Select the appropriate current for heating with electric heating wire, cut the foam type according to the sample, make the gate system model. The foam type should be dried before use.

[0078] Step S22: The yellow zone is mainly used for mixing paint, foam coating and drying, modeling and embedding boxes, etc.

[0079] Step S221: mixing the coating material includes:

[0080] ⑴ The mixed aggregate is high-aluminum powder water-based paint.

[0081] ⑵ Before operation, carefully check the operation of the mixing drum and clean the inside.

[0082] ⑶ Pre-process various raw materials strictly according to the formula requirements.

[0083] ⑷ Accurately weigh various raw materials and add them according to the recipe requirements.

[0084] ⑸ The mixing time is 2-4 hours. During the mixing process, the material port can be opened to observe the coating state and adjust the consistency.

[0085] ⑹ Try to mix and use immediately.

[0086] Step S222: coating and drying includes:

[0087] ⑴ After the model is completely dry and the gate system is assembled, the surface is coated with paint. The coating is generally two layers (the second layer can be applied only after the first layer is completely dry). After the paint is dry, the total thickness should be controlled within 1.5mm as much as possible.

[0088] ⑵ The first layer of paint should be applied evenly and thoroughly, and the paint should be spread with a brush at the corners of the model. If bubbles, missing paint or cracks are found after drying, they should be repaired in time.

[0089] ⑶ During the entire process of coating, hanging and drying, care should be taken to prevent model deformation, dislocation or cracks on the bonding surface.

[0090] ⑷ After applying the paint, the foam drying time shall not be less than 12 hours.

[0091] ⑸ The humidity in the paint drying room shall not be greater than 30, and the temperature shall be controlled at 40℃-50℃.

[0092] Step S223: The modeling and embedding box operation includes:

[0093] ⑴ Determine the amount of sand and the depth of the bottom sand according to the total height of the model and the size of the sand box.

[0094] ⑵ Check all parts of the sand box and conduct a no-load operation test on the vibrating table. When you are sure that everything is correct, add bottom sand to the sand box and vibrate it. The molding sand used during molding should not be higher than 40℃.

[0095] ⑶Put the model into the sand box. Before putting it in, check whether the model is dry and whether there is any cracking.

[0096] (4) Add sand into the sand box and select the appropriate vibration frequency to ensure that all parts of the casting are filled with dry sand and have a certain degree of compactness.

[0097] ⑸ After adding sand and vibrating, make the upper surface straight runner connection smooth, cover it with plastic film, place the pouring cup and add a layer of protective sand on the film.

[0098] ⑹ Transport the sand box to the pouring area and prepare for pouring.

[0099] Step S23: The black area mainly carries out liquid metal smelting, pouring, casting cleaning, finishing inspection and other work, including:

[0100] Step S231: Liquid metal smelting executes alloy block molten iron pretreatment requirements.

[0101] Step S232: pouring and unpacking includes:

[0102] ⑴ Before pouring, check whether the seal between the pouring cup and the plastic film is intact.

[0103] ⑵ During pouring, the molten iron should rush to the end away from the sprue to avoid the molten iron rushing directly into the sprue.

[0104] ⑶ During pouring, the vacuum pump should be turned on with a negative pressure of 0.05Mpa, and the vacuum extraction should be stopped 5 minutes after the pouring is completed.

[0105] (4) The alloy block is boxed 2 hours after pouring.

[0106] Step 3: After the alloy block is shot blasted, heat treatment is performed including:

[0107] Step 31: Shot blast the alloy block to remove surface coating and oxide scale to avoid affecting the heat treatment effect. ;

[0108] Step 32: After the alloy block is put into the resistance furnace, the temperature is raised to 200℃±10℃ for 1 hour, and the temperature is averaged at 200℃±10℃ for 1 hour to eliminate thermal stress. The temperature is further raised to 650℃±10℃ for 7 hours, and the temperature is kept for 2 hours to eliminate stress. In preparation for quenching, the temperature is raised from 650℃±10℃ to 920℃±10℃ for 2.7 hours, and air-cooled quenching is performed after keeping the temperature for 2 hours. The quenching heat treatment can refine the grains, improve the strength and hardness of the alloy block, and enhance the wear resistance.

[0109] Step 33: After the alloy block is quenched, it is tempered twice at 480℃±10℃ and 300℃±10℃ to obtain the finished product. The two temperings can eliminate the stress generated during the quenching heat treatment, stabilize the structure, and further improve the toughness and wear resistance of the alloy block. After the alloy block completes the heat treatment, the surface hardness reaches HRC60-62, and it has a strong ability to resist the wear of low-impact materials.

[0110] Another aspect of the present application provides a composite inlay casting process of a wear-resistant alloy block. Since the jaw plate body and the alloy block are made of different materials, the heat treatment process is different and they cannot be cast into one piece and heat treated in the same furnace. After the jaw plate body and the alloy block are heat treated and finished separately, the alloy block is inlaid in the cavity on the tooth surface of the jaw plate body to achieve an organic combination of the high hardness of the alloy block and the toughness of the ultra-high manganese steel body. The following measures are adopted to improve the inlay strength of the alloy block and the jaw plate body to avoid the problem of the alloy block falling off during the installation and operation of the jaw plate, specifically including:

[0111] Step A1: Calculate the number and distribution spacing of the wear-resistant alloy blocks on the jaw plate tooth surface to ensure that the gap between the tooth surface cavity of the movable jaw plate body and the fixed jaw plate body and the wear-resistant alloy blocks is appropriate for smooth assembly; Figure 1 , Figure 2As shown, the height dimension of the wear-resistant alloy block 3 is consistent with the depth dimension of the cavity cast on the tooth surface of the movable jaw plate body 1 and the fixed jaw plate body 2, and the top arc dimension of the wear-resistant alloy block 3 is consistent with the arc dimension of the tooth surface of the movable jaw plate body 1 and the fixed jaw plate body 2. The wear-resistant alloy block 3 is inserted into the tooth surface cavity of the movable jaw plate body 1 and the fixed jaw plate body 2, and the working surface of the wear-resistant alloy block 3 is consistent with the R25 arc surface of the tooth top and the 15° inclined surfaces on both sides of the movable jaw plate body 1 and the fixed jaw plate body 2. The wear-resistant alloy block 3 is cast with the tooth surface of the movable jaw plate body 1 and the fixed jaw plate body 2 as the reference, and the height deviation is controlled within ±2mm, so as to ensure that after the wear-resistant alloy block 3 is cast, the tooth surface size and shape of the movable jaw plate body 1 and the fixed jaw plate body 2 meet the design requirements of the original drawing. In the embodiment of the present application, 108 72mm×72mm×100mm cavities are cast on the tooth surface of the movable jaw plate body 1, and 135 72mm×72mm×100mm cavities are cast on the tooth surface of the fixed jaw plate body 2. The height of the wear-resistant alloy block is 100mm±5mm, and the width of the wear-resistant alloy block is 64mm±5mm. In order to increase the bonding force between the wear-resistant alloy block 3 and the movable jaw plate body 1 and the fixed jaw plate body 2, the tooth surface cavity gap between the wear-resistant alloy block 3 and the movable jaw plate body 1 and the fixed jaw plate body 2 is 4mm±1mm, and the spacing between the wear-resistant alloy blocks 3 is 20mm±3mm.

[0112] Step A2: After the movable jaw plate body 1, the fixed jaw plate body 2 and the wear-resistant alloy block 3 are heat-treated respectively, the wear-resistant alloy block 3 is centrally embedded in the tooth surface cavities of the movable jaw plate body 1 and the fixed jaw plate body 2;

[0113] Step A3: After the inlay quality meets the standard, high-strength resin glue backing filler 4 is filled into the assembly gap between the movable jaw plate body 1, the fixed jaw plate body 2 and the wear-resistant alloy block 3. After standing for 24 hours, the wear-resistant alloy block 3, the movable jaw plate body 1, and the fixed jaw plate body 2 are firmly bonded into a whole.

[0114] In the embodiment of the present application, the high-strength resin glue backing filler 4 adopts a special backing filling material for the cone crusher liner, which is mainly used for the installation of the fixed cone liner of the MS400 cone crusher. After the relative position of the finished fixed cone liner and the frame is adjusted to meet the standard requirements, the special backing filling material is filled in the gap between the two. After standing for 24 hours, the backing material hardens and the fixed cone liner and the frame are bonded into one. After the fixed cone liner is installed, it can operate stably for a long period of time. The present application uses the high-strength resin glue backing filler 4 to bond the wear-resistant alloy block 3 with the movable jaw plate body 1 and the fixed jaw plate body 2, which can effectively solve the problem of the wear-resistant alloy block 3 falling off during the jaw plate installation and operation, and achieve long-term stable operation of the equipment.

[0115] Embodiment 2

[0116] The difference between the embodiment of the present application and the first embodiment is that a wear-resistant alloy block is provided, and the mass percentage of the chemical composition is: C: 3.0%; Si: 0.5%; Mn: 0.9%; Cr: 19.0%; Ni: 0.5%; Cu: 0.7%; Mo: 0.9%; P≤0.03%; S≤0.02%; the balance is Fe and trace elements. After the alloy block is put into the resistance furnace, the temperature is raised to 195°C for 1 hour, and the temperature is averaged at 195°C for 1 hour to eliminate thermal stress. The temperature is continued to be raised to 645°C for 7 hours, and the temperature is kept for 2 hours to eliminate stress. In preparation for quenching, the temperature is raised from 645°C to 915°C for 2.7 hours, and air-cooled quenching is performed after keeping the temperature for 2 hours. After the alloy block is quenched, it is tempered twice at 480°C and 300°C in sequence to obtain the finished product. The height of the wear-resistant alloy block 3 is 100mm, and the width of the wear-resistant alloy block 3 is 64mm. In order to increase the bonding force between the wear-resistant alloy block 3 and the movable jaw plate body 1 and the fixed jaw plate body 2, the tooth surface cavity gap between the wear-resistant alloy block 3 and the movable jaw plate body 1 and the fixed jaw plate body 2 is 4 mm, and the spacing between the wear-resistant alloy blocks 3 is 20 mm. The rest is completely consistent with the first embodiment.

[0117] Embodiment 3

[0118] The difference between the embodiment of the present application and the embodiment 1 is that a wear-resistant alloy block is provided, and the mass percentage of the chemical composition is: C: 3.3%; Si: 0.6%; Mn: 1.0%; Cr: 20.0%; Ni: 0.4%; Cu: 0.8%; Mo: 1.0%; P≤0.01%; S≤0.03%; the balance is Fe and trace elements. After the alloy block is put into the resistance furnace, the temperature is raised to 205°C for 1 hour, and the temperature is averaged at 205°C for 1 hour to eliminate thermal stress. The temperature is continued to be raised to 655°C for 7 hours, and the temperature is kept for 2 hours to eliminate stress. In preparation for quenching, the temperature is raised from 655°C to 925°C for 2.7 hours, and air-cooled quenching is performed after keeping the temperature for 2 hours. After the alloy block is quenched, it is tempered twice at 475°C and 295°C in sequence to obtain the finished product. The height of the wear-resistant alloy block 3 is 104mm, and the width of the wear-resistant alloy block 3 is 69mm. In order to increase the bonding force between the wear-resistant alloy block 3 and the movable jaw plate body 1 and the fixed jaw plate body 2, the tooth surface cavity gap between the wear-resistant alloy block 3 and the movable jaw plate body 1 and the fixed jaw plate body 2 is 3 mm, and the spacing between the wear-resistant alloy blocks 3 is 21 mm. The rest is completely consistent with the first embodiment.

[0119] Embodiment 4

[0120] The difference between the embodiment of the present application and the embodiment 1 is that a wear-resistant alloy block is provided, and the mass percentage of the chemical composition is: C: 3.2%; Si: 0.7%; Mn: 1.1%; Cr: 21.0%; Ni: 0.6%; Cu: 0.7%; Mo: 1.1%; P≤0.02%; S≤0.01%; the balance is Fe and trace elements. After the alloy block is put into the resistance furnace, the temperature is raised to 210°C for 1 hour, and the temperature is averaged at 210°C for 1 hour to eliminate thermal stress. The temperature is continued to be raised to 660°C for 7 hours, and the temperature is kept for 2 hours to eliminate stress. In preparation for quenching, the temperature is raised from 660°C to 930°C for 2.7 hours, and air-cooled quenching is performed after keeping the temperature for 2 hours. After the alloy block is quenched, it is tempered twice at 490°C and 310°C in sequence to obtain the finished product. The height of the wear-resistant alloy block 3 is 95mm, and the width of the wear-resistant alloy block 3 is 60mm. In order to increase the bonding force between the wear-resistant alloy block 3 and the movable jaw plate body 1 and the fixed jaw plate body 2, the tooth surface cavity gap between the wear-resistant alloy block 3 and the movable jaw plate body 1 and the fixed jaw plate body 2 is 5 mm, and the spacing between the wear-resistant alloy blocks 3 is 18 mm. The rest is completely consistent with the first embodiment.

[0121] Embodiment 5

[0122] The difference between the embodiment of the present application and the embodiment 1 is that a wear-resistant alloy block is provided, and the mass percentage of the chemical composition is: C: 3.4%; Si: 0.8%; Mn: 1.2%; Cr: 21.5%; Ni: 0.45%; Cu: 0.9%; Mo: 1.2%; P≤0.009%; S≤0.009%; the balance is Fe and trace elements. After the alloy block is put into the resistance furnace, the temperature is raised to 190°C for 1 hour, and the temperature is averaged at 190°C for 1 hour to eliminate thermal stress. The temperature is continued to be raised to 640°C for 7 hours, and the temperature is kept for 2 hours to eliminate stress. In preparation for quenching, the temperature is raised from 640°C to 910°C for 2.7 hours, and air-cooled quenching is performed after the temperature is kept for 2 hours. After the alloy block is quenched, it is tempered twice at 485°C and 305°C in sequence to obtain the finished product. The height of the wear-resistant alloy block 3 is 98mm, and the width of the wear-resistant alloy block 3 is 67mm. In order to increase the bonding force between the wear-resistant alloy block 3 and the movable jaw plate body 1 and the fixed jaw plate body 2, the tooth surface cavity gap between the wear-resistant alloy block 3 and the movable jaw plate body 1 and the fixed jaw plate body 2 is 4 mm, and the spacing between the wear-resistant alloy blocks 3 is 17 mm. The rest is completely consistent with the first embodiment.

[0123] The technical solution of the above invention has at least the following technical effects or advantages:

[0124] 1. The embodiment of the present application adopts the lost foam casting process to replace the powder metallurgy process to mass produce the wear-resistant alloy blocks, which reduces the production cost of the wear-resistant alloy blocks by 75%, thereby improving the cost performance of the jaw plate;

[0125] 2. The embodiment of the present application adopts high-strength resin adhesive backing filler to fill the gap instead of thin steel plate to fill the gap, which can achieve an organic combination of the high hardness of the wear-resistant alloy block and the high strength and toughness of the ultra-high manganese steel jaw plate body, solves the problem of wear-resistant alloy block falling off during the installation and operation of the jaw plate, and realizes long-term stable operation of the equipment.

[0126] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0127] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0128] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0129] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0130] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0131] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0132] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0133] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A wear-resistant alloy block, characterized in that: The mass percentage of its chemical composition is: C: 3.0%-3.4%; Si: 0.4%-0.8%; Mn: 0.8%-1.2%; Cr: 19.0%-22.0%; Ni: 0.4%-0.6%; Cu: 0.7%-0.9%; Mo: 0.8%-1.2%; P≤0.04%; S≤0.04%; the balance is Fe and trace elements.

2. A method for making a wear-resistant alloy block as claimed in claim 1, characterized in that: include: Pre-treating the molten iron; The pretreated molten iron is subjected to a lost foam casting process to obtain an alloy block; The alloy block is subjected to shot blasting treatment and then heat treatment to obtain a finished product.

3. The method according to claim 2, characterized in that: The pretreatment of molten iron comprises: Add a slag remover to the molten iron in the furnace and remove the slag three times repeatedly, add 0.3% rare earth, stir the molten iron evenly, cool it to 1550℃~1560℃ and take it out of the furnace; Clean the residual slag in the tapping trough and ladle before tapping; After the iron is tapped, a slag remover is added into the ladle and the slag is removed repeatedly for three times. When the temperature is between 1470°C and 1480°C, the pretreated molten iron is poured by a traveling carriage.

4. The method according to claim 3, characterized in that: The alloy block is obtained by the lost foam casting process of the pretreated molten iron, including: Forming a foam mold of the alloy block; Mixing the coating, applying the coating to the alloy block foam type, drying it and forming a modeling buried box; The pretreated molten iron is poured to obtain an alloy block.

5. The method according to claim 4, characterized in that: Mixing the coating, applying the coating to the alloy block foam type, drying and molding the embedded box includes: The mixed aggregate is a high-aluminum powder water-based paint. The raw materials are pre-treated, weighed and added according to the formula requirements. The mixing time is 2 hours to 4 hours, and it can be used immediately after mixing. After the alloy block foam mold is dried thoroughly and the gate system is assembled, the surface is coated with paint. The coating is two layers. The second layer is applied after the first layer is dried. The total thickness of the paint is controlled to be 1.5 mm after drying. The first layer of paint is evenly spread. The paint is spread with a brush at the corners of the model. After drying, local bubbles, missing paint or cracks are found, which should be repaired in time; After coating, the foam type drying time shall not be less than 12 hours; The humidity in the paint drying room should not exceed 30°C and the temperature should be controlled at 40°C-50°C; Determine the amount of sand intake and the depth of the bottom sand according to the total height of the alloy block foam mold and the size of the sand box; Check all parts of the sand box and conduct a no-load operation test on the vibrating table. When you are sure everything is correct, add bottom sand to the sand box and vibrate it. The molding sand used during molding should not be higher than 40℃. After adding sand and vibrating, make the upper surface of the sprue connection smooth, lay a plastic film, put the pouring cup in place and add a layer of protective sand on the film, and then transport the sand box to the pouring area to prepare for pouring.

6. The method according to claim 5, characterized in that: The alloy block is cast by molten iron after pretreatment to obtain the alloy block, comprising: Before pouring, check whether the seal between the pouring cup and the plastic film is intact; During pouring, the pretreated molten iron is rushed to the end away from the sprue to prevent the pretreated molten iron from rushing directly to the sprue; While pouring, turn on the vacuum pump, with a negative pressure of 0.05Mpa, and stop extracting the vacuum 5 minutes after pouring. After pouring for 2 hours, the alloy blocks were boxed.

7. The method according to claim 6, characterized in that: After the alloy block is subjected to shot blasting, heat treatment is performed to obtain a finished product, including: The alloy block is subjected to shot blasting treatment; After the alloy block is put into the resistance furnace, the temperature is raised to 200°C±10°C for 1 hour, the temperature is averaged at 200°C±10°C for 1 hour to eliminate thermal stress, the temperature is further raised to 650°C±10°C for 7 hours, the temperature is kept for 2 hours to prepare for quenching, the temperature is raised from 650°C±10°C to 920°C±10°C for 2.7 hours, the temperature is kept for 2 hours, and air cooling quenching is performed; After the alloy block is quenched, it is tempered twice at 480°C±10°C and 300°C±10°C in sequence to obtain a finished product.

8. A composite casting process for a wear-resistant alloy block as claimed in claim 7, characterized in that: include: Calculate the number and distribution spacing of the wear-resistant alloy blocks on the tooth surfaces of the movable jaw plate body and the fixed jaw plate body; After the movable jaw plate body, the fixed jaw plate body and the wear-resistant alloy block are heat-treated respectively, the wear-resistant alloy block is embedded in the tooth surface cavity of the jaw plate body; After the inlay quality meets the standard, high-strength resin glue backing filler is filled in the assembly gap between the movable jaw plate body, the fixed jaw plate body and the wear-resistant alloy block. After standing for 24 hours, the wear-resistant alloy block and the movable jaw plate body and the fixed jaw plate body are firmly bonded into a whole.

9. The composite casting process according to claim 8, characterized in that: The height dimension of the wear-resistant alloy block is consistent with the depth dimension of the cavity cast on the tooth surface of the movable jaw plate body and the fixed jaw plate body, and the top arc surface dimension of the wear-resistant alloy block is consistent with the arc dimension of the tooth surface of the movable jaw plate body and the fixed jaw plate body. The wear-resistant alloy block is inserted into the tooth surface cavity of the movable jaw plate body and the fixed jaw plate body. The working surface of the wear-resistant alloy block is consistent with the R25 arc surface of the tooth top and the 15° inclined surfaces on both sides of the movable jaw plate body and the fixed jaw plate body. The wear-resistant alloy block is cast based on the tooth surface of the movable jaw plate body and the fixed jaw plate body, and the height deviation is controlled within ±2mm.

10. The composite casting process according to claim 8, characterized in that: The height of the wear-resistant alloy block is 100 mm ± 5 mm, and the width of the wear-resistant alloy block is 64 mm ± 5 mm; The tooth surface cavity clearance between the wear-resistant alloy block and the movable jaw plate body and the fixed jaw plate body is 4mm±1mm, and the spacing between the wear-resistant alloy blocks is 20mm±3mm.

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