Forming die forging-all-metal lifting strip

Abstract

The utility model discloses a loose tooling forging-all-metal lifting strip which comprises a lifting strip body which is integrally formed in a forging mode. Dovetail grooves are formed in the two side edges of the bottom face of the lifting strip body. The dovetail groove does not penetrate through the lifting strip body; an inclined face is arranged on the front face of the lifting strip body and serves as a working face. The depth of the dovetail groove does not exceed the horizontal plane where the bottom of the inclined face is located. According to the lining plate manufactured through the forging process, the abrasion resistance is improved, the frequency of maintenance and replacement is reduced, the production cost is reduced, the long-term stable working state of a machine is guaranteed, and remarkable benefits are brought to industrial production.

Description

Technical Field

[0001] The utility model belongs to the technical field of steel lifting strips and relates to a die forged all-metal lifting strip. Background Art

[0002] The liner of a semi-autogenous grinding mill is a wear-resistant material whose primary function is to protect the cylinder from direct impact and friction between the grinding media and the material. It also enhances the crushing effect on the material by adjusting the motion of the grinding media, thereby improving the mill's grinding efficiency and output and reducing metal consumption. Key considerations include the lifting effect on the grinding media, the media's trajectory, and operating conditions. This liner exhibits excellent properties such as wear and impact resistance, high strength, and high toughness. It maintains wear resistance under high-intensity, high-frequency impacts, and is resistant to fracture and breakage while withstanding high wear, ensuring a long service life. This wear-resistant material is widely used in industries such as mining and mineral processing. In particular, the performance and quality of the semi-autogenous grinding mill's wear-resistant liner, a key piece of equipment for grinding ore into powder and separating the desired minerals, directly impacts the efficiency and cost of the entire process.

[0003] Traditional cast liners are primarily produced through casting. Problems include unstable raw material alloying elements, and the tendency for casting to produce defects such as shrinkage and slag inclusions. These defects often break during use, necessitating frequent replacement and limiting mine beneficiation efficiency. Utility Model Content

[0004] In order to solve the deficiencies of the above technologies, the purpose of the present invention is to provide a wear-resistant liner, a lifting strip and a forming method thereof which have high production efficiency, high quality wear resistance and high toughness.

[0005] The utility model proposes a die-forged all-metal lifting strip, comprising: a lifting strip body, wherein the lifting strip body is forged in one piece;

[0006] Both sides of the bottom surface of the lifting bar body are provided with dovetail grooves; the dovetail grooves do not penetrate the lifting bar body;

[0007] The front side of the lifting bar body is provided with an inclined surface as a working surface;

[0008] The depth of the dovetail groove does not exceed the horizontal plane where the bottom of the inclined surface is located.

[0009] In the present invention, the top of the dovetail groove is set with a rounded corner R8; the length of the dovetail groove is 45mm; the narrowest part of the dovetail groove is 21mm, and the widest part is 36mm; the bottom of the dovetail groove is 26mm; the center lines of the dovetail groove are set at intervals of 60mm.

[0010] In the present invention, the angle between the back of the lifting bar body and the vertical plane is 0-30 degrees, preferably 5 degrees. The top of the lifting bar body is rounded R30. The distance between the bottom edge of the back of the lifting bar body and the center line of the nearest dovetail groove is 56 mm.

[0011] In the present invention, the angle between the inclined plane and the vertical plane is 15-35°, preferably 26°.

[0012] Based on the above die forging-all-metal lifting strip, the present invention also proposes a die forging method for an all-metal lifting strip, comprising the following steps:

[0013] Step 1: First, the electroslag ingot is heated to a forging temperature of 1200-1250°C and forged into a square cross-section billet of the required size;

[0014] Step 2: The billet is heated to a forging temperature of 1200-1250°C for secondary heating to form a forging bevel;

[0015] Step 3: The inclined blank is heated three times to a forging temperature of 1200-1250°C and then finalized by die forging;

[0016] Step 4: The final forged lifting strip is spheroidized annealed to prevent cracking of the forging;

[0017] Step 5: The forging is processed into a finished liner by subsequent machining;

[0018] Step 6: The machined liner is heat treated to obtain the final product to achieve the required performance indicators.

[0019] This utility model adopts 3 heating forming. Heating and forging more than 4 times will lead to the reduction of material properties of steel alloy forgings, see the table below:

[0020]

[0021] In the present invention, the heating temperature of each forging is decreased in a decreasing manner, at a rate of 10 to 20° C. per firing, so as to ensure the uniformity of the grain structure of the steel alloy material after forging.

[0022] The utility model also proposes a die forging-all-metal lifting strip forming method of first forging and then sawing, comprising the following steps:

[0023] Step 1: First, the electroslag ingot is heated to the forging temperature of 1200-1250℃, and then the ingot is opened into the required size square cross-section steel billet. The two pieces are combined as shown in the following figure: Figure 4 As shown, the blue line is the sawing line;

[0024] Step 2: The billet forging lifting bar is subjected to spheroidizing annealing to prevent the forging from cracking;

[0025] Step 3: The billet is sawn into wear-resistant lining plates by a band saw;

[0026] Step 4: After sawing, the lining plate is machined to obtain the finished product;

[0027] Step 5: The machined liner is heat treated to obtain the final product to achieve the required performance indicators.

[0028] In the present invention, 1-2 heating forming is adopted, and the heating temperature of each forging should be reduced in a decreasing manner, with a decrease of 10-20°C / fire, so as to ensure the uniformity of the microstructure grain of the steel alloy forging alloy material after forging and improve the forging efficiency;

[0029] In the utility model, the cross-sectional size is obtained by sawing, so as to improve the material utilization rate.

[0030] The utility model also proposes a plate-shaped composite lifting strip, comprising: a plate-shaped lifting strip body, wherein the plate-shaped lifting strip body is forged in one piece;

[0031] Both sides of the back of the plate-shaped lifting strip body are provided with dovetail grooves; the dovetail grooves do not penetrate the plate-shaped lifting strip body;

[0032] The front surface and top surface of the plate-shaped lifting strip body serve as working surfaces.

[0033] In the present invention, the top of the dovetail groove is set with a rounded corner R8; the length of the dovetail groove is 40mm; the narrowest part of the dovetail groove is 21mm, and the widest part is 36mm; the bottom of the dovetail groove is 26mm; the center lines of the dovetail groove are set at intervals of 60mm.

[0034] In the present invention, R20 fillets are set between the front surface of the plate-like lifting strip body and the top and bottom surfaces; and / or, R5 fillets are set between the back surface of the plate-like lifting strip body and the top and bottom surfaces; the distance between the bottom edge surface of the plate-like lifting strip body and the center line of the nearest dovetail groove is 48mm.

[0035] Based on the above plate-like structure composite lifting strip, the present invention also proposes a forging method for the plate-like structure composite lifting strip, comprising the following steps:

[0036] Step 1: First, the steel alloy wear-resistant liner is designed into a plate structure;

[0037] Step 2: The electroslag ingot is heated to a forging temperature of 1200-1250°C and forged to the required size to form a wear-resistant liner forging lifting strip;

[0038] Step 3: The liner forging lifting strip is spheroidized annealed to prevent the forging from cracking;

[0039] Step 4: After annealing, the forgings are cut into plate-shaped wear-resistant liner forgings using a band saw;

[0040] Step 5: The finished plate-shaped lining plate is obtained by machining;

[0041] Step 6: The machined liner is heat treated to obtain the final product to achieve the required performance indicators.

[0042] Step 7: The lining plate is then compounded with the rubber and other parts to form a lining plate assembly.

[0043] In the present invention, 1-2 heating forming is adopted, and the heating temperature of each forging should be reduced in a decreasing manner, with a decrease of 10-20°C / fire, so as to ensure the uniformity of the microstructure grain of the steel alloy forging alloy material after forging and improve the forging efficiency;

[0044] The utility model obtains a plate-shaped structure lining plate by sawing, so as to improve the material utilization rate.

[0045] The utility model also proposes a high-wear-resistant and high-toughness forged steel alloy material for semi-autogenous mill liners, whose composition formula includes the following elements in weight percentage: C: 0.40% to 0.70%; Si: 0.2% to 1.0%; Mn: 0.2% to 1.0%; Cr: 5% to 7%; Mo: 1.0% to 2.0%; V: 0.5% to 1.0%; Ni: 0.2% to 0.5%, and the balance is iron.

[0046] Furthermore, the high wear-resistant and high-toughness forged steel alloy material includes the following elements in weight percentage: C: 0.40%; Si: 0.5%; Mn: 0.4%; Cr: 5%; Mo: 2.3%; V: 1.0%; Ni: 0.3%; P: 0.01%; S: 0.005%, and the balance is iron.

[0047] Furthermore, the high wear-resistant and high-toughness forged steel alloy material includes the following elements in weight percentage: C: 0.40%; Si: 0.45%; Mn: 0.5%; Cr: 6%; Mo: 1.2%; V: 0.7%; Ni: 0.2%; P: 0.01%; S: 0.005%, and the balance is iron.

[0048] Furthermore, the high wear-resistant and high-toughness forged steel alloy material includes the following elements in weight percentage: C: 0.45%; Si: 0.5%; Mn: 1.5%; Cr: 6.5%; Mo: 0.5%; V: 0.2%; Ni: 0.3%; P: 0.01%; S: 0.003%, and the balance is iron.

[0049] Furthermore, the high wear-resistant and high-toughness forged steel alloy material includes the following elements in weight percentage: C: 0.45%; Si: 0.55%; Mn: 1.5%; Cr: 7%; Mo: 0.2%; V: 0.5%; Ni: 0.3%; P: 0.01%; S: 0.004%, and the balance is iron.

[0050] Furthermore, the high wear-resistant and high-toughness forged steel alloy material includes the following elements in weight percentage: C: 0.60%; Si: 0.6%; Mn: 1.4%; Cr: 5.5%; Mo: 0.45%; V: 0.25%; Ni: 0.5%; P: 0.008%; S: 0.004%, and the balance is iron.

[0051] Furthermore, the high wear-resistant and high-toughness forged steel alloy material includes the following elements in weight percentage: C: 0.70%; Si: 0.55%; Mn: 1.2%; Cr: 5%; Mo: 0.65%; V: 0.3%; Ni: 0.5%; P: 0.01%; S: 0.005%, and the balance is iron.

[0052] This utility model also proposes a method for preparing a highly wear-resistant and high-toughness forged steel alloy material for use in semi-autogenous mill liners, comprising smelting, electroslag remelting, high-temperature homogenization, forging (two upsetting steps and two drawing steps), ultra-fine processing, and quenching and tempering. The resulting steel alloy material exhibits excellent strength, toughness, and wear resistance. Specifically, the preparation method comprises the following steps:

[0053] Step 1, smelting: The raw materials are placed in an electric arc furnace or a medium frequency electric furnace for smelting. After the composition meets the requirements, the molten steel is temperature-controlled to 1500-1550°C and cast into a mold of the required specifications to form an electrode steel rod. After cooling and demolding, a special grinding wheel is used to remove the oxide scale and pit defects on the surface of the electrode rod; wherein the raw materials refer to high-quality scrap steel or alloy steel, low-carbon ferrochrome, ferromolybdenum, ferrovanadium, etc.

[0054] In the present invention, the composition detection before and after the furnace is carried out by using a direct reading spectrometer to determine whether the composition meets the requirements.

[0055] Step 2, electroslag remelting: The electrode steel rod, from which the surface oxide scale and pit defects have been removed in step 1, is subjected to electroslag remelting, so that the molten steel is filtered through the slag system to remove impurities and then slowly crystallizes and solidifies into electroslag ingots. The electroslag ingots are of different specifications according to the product size and forging ratio requirements;

[0056] Step 3, high temperature homogenization: heat the round electroslag steel ingot obtained in step 2 to 1200-1250°C for 0.3×D hours, where D is the ingot diameter in cm, to uniformly diffuse the components in the steel, and then cool it to the forging temperature of 1150-1200°C;

[0057] Step 4, upsetting: The electroslag steel ingot at 1150-1200°C is upset to 30% of the ingot height on a press, then finished and returned to the furnace for heating for 2-4 hours; then a second upsetting to 50% of the height is performed, followed by finishing, and the final forging temperature is always maintained above 870-1250°C;

[0058] Step 5, drawing: the steel ingot after the secondary repeated upsetting is drawn and forged to the final size to obtain a module, the final forging temperature is maintained above 870-1250℃, and after drawing, it is pit cooled to about 350℃;

[0059] Step 6, ultra-fine treatment: heat the module to 1050-1100°C and hold it for (0.2-0.3) × d hours, where d is the effective thickness of the forging in cm. Water quench to about 100°C, then heat it to 870±10°C and hold it isothermally for (0.4-0.6) × d hours, where d is the effective thickness of the forging in cm. Then, cool it to 500-550°C with the furnace door slightly open, then quickly heat it to 750±10°C, hold it isothermally for (0.9-1.2) × d hours, where d is the effective thickness of the forging in cm. Then, cool it to 300°C and air-cool it.

[0060] In the present invention, the slightly open furnace door has the following effects: 1) reducing the process cycle; 2) obtaining a better grain size and more non-spontaneous nucleation cores;

[0061] Step 7, processing the blank obtained in step 6 into a finished product by a CNC machine tool;

[0062] Step 8, quenching and tempering treatment: heat the module to 1000-1050℃ and keep it warm for 5-10 hours, oil quench to about 100℃, take it out of the furnace and air cool it, and immediately temper it at a tempering temperature of 550-600℃ and keep it warm for 5-10 hours. Temper it three times to obtain a high wear-resistant and high-toughness forged steel alloy material for semi-autogenous mill liner.

[0063] The steel alloy material proposed in this utility model has the following performance indicators: hardness 48-54HRC; impact energy (U port) ≥ 20J; wear resistance is improved by 50% compared with Taibai chromium-molybdenum steel. Figure 1 As shown, Figure 1 GH6 is the steel alloy model customized by the applicant.

[0064] The utility model also provides a high-wear-resistant and high-toughness forged steel alloy material prepared by the method.

[0065] The utility model also proposes the application of the high wear-resistant and high-toughness forged steel alloy material in the lining plate of a semi-autogenous grinding mill.

[0066] The three forging processes proposed in this utility model have the same size and performance indicators of the alloy products obtained by the first two different forming processes, and the difference lies in the processing method. The third one mainly reflects the difference in alloy structure size, but the performance indicators are the same.

[0067] The lifting strip proposed in the utility model solves the notch sensitivity of forging materials and does not cause cracks such as through holes. The utility model solves these problems by developing a new type of forged wear-resistant liner. The liner manufactured by the forging process not only improves the wear resistance, but also reduces the frequency of maintenance and replacement, reduces production costs, ensures the long-term stable working state of the machine, and brings significant benefits to industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0069] Figure 1 This is a schematic diagram of the relative wear resistance of the steel alloy of the utility model and Taibai chromium-molybdenum steel.

[0070] Figure 2 This is a schematic diagram of the metallographic structure of the steel alloy of the present invention: martensite + retained austenite.

[0071] Figures 3a-3c This is the structural diagram of the tire die forging-all metal lifting strip of the utility model.

[0072] Figure 4 It is a schematic diagram of the merging of two parts in the die forging-full metal lifting strip of the utility model.

[0073] Figures 5a-5e This is a structural diagram of the plate-shaped composite lifting strip of the utility model.

[0074] Figures 6a-6d This is a schematic diagram of the use of the plate-shaped composite lifting strip of the utility model.

[0075] Figures 7a-7d This is a schematic diagram of the use of the tire die forging-all metal lifting strip of the utility model. DETAILED DESCRIPTION

[0076] The utility model is further described in detail with reference to the following specific embodiments and drawings. The processes, conditions, experimental methods, etc. for implementing the utility model, except for those specifically mentioned below, are common knowledge and common common sense in the field and are not particularly limited by the present utility model.

[0077] Example 1 Preparation of high wear-resistant and high toughness forging steel alloy material

[0078] Step 1, smelting: The raw materials are placed in an electric arc furnace or a medium frequency furnace for smelting. After the composition meets the requirements, the molten steel is controlled at 1500℃ and cast into a mold of the required specifications to form an electrode steel rod. After cooling and demolding, the surface oxide scale and pit defects of the electrode rod are removed with a grinding wheel machine;

[0079] Step 2, electroslag remelting: Electroslag remelting is performed on the electrode rods, so that the molten steel is filtered through the slag system to remove impurities and then slowly crystallizes and solidifies into electroslag ingots of the required specifications;

[0080] Step 3, high temperature homogenization: heat the round steel ingot to 1200°C and hold it for 0.3 × D hours, where D is the ingot diameter in cm, to allow the components in the steel to diffuse evenly, then cool it to the forging temperature of 1150°C.

[0081] Step 4, upsetting: The 1150°C electroslag ingot is upset to 30% of the ingot height on a press, then finished and returned to the furnace for heating for 2 hours; then a second upsetting to 50% of the height is performed, followed by finishing, and the final forging temperature is always maintained at 880°C;

[0082] Step 5, drawing: the steel ingot after the secondary repeated upsetting is drawn and forged to the final size to obtain a module, the final forging temperature is maintained at 880°C, and after drawing, it is pit cooled to 350°C;

[0083] Step 6, ultra-fine treatment: heat the module to 1050℃ and hold it for 0.2×d hours, where d is the effective thickness of the forging in cm, water quench it to about 100℃, then heat it to 870±10℃ and hold it isothermal for 0.4×d hours, where d is the effective thickness of the forging in cm; then cool it to 500℃ with the furnace door slightly open, then quickly heat it to 750±10℃ and hold it isothermal for 0.9×d hours, where d is the effective thickness of the forging in cm, then cool it to 300℃ and air cool it out of the furnace;

[0084] Step 7, processing the blank into a finished product through a CNC machine tool;

[0085] Step 8, quenching and tempering treatment: heat the module to 1000℃ and keep it for 5 hours, oil quench to about 100℃, take it out of the furnace and air cool it, and immediately temper it at the tempering temperature of 550℃ and keep it for 5 hours, and temper it 3 times.

[0086] Example 2 Preparation of High Wear-Resistant and High Toughness Forged Steel Alloy Material

[0087] Step 1, smelting: The raw materials are placed in an electric arc furnace or a medium frequency furnace for smelting. After the composition meets the requirements, the molten steel is controlled at 1550℃ and cast into a mold of the required specifications to form an electrode steel rod. After cooling and demolding, the surface oxide scale and pit defects of the electrode rod are removed with a grinding wheel machine;

[0088] Step 2, electroslag remelting: Electroslag remelting is performed on the electrode rods, so that the molten steel is filtered through the slag system to remove impurities and then slowly crystallizes and solidifies into electroslag ingots of the required specifications;

[0089] Step 3, high temperature homogenization: heat the round steel ingot to 1250°C and hold it at this temperature for 0.3 × D hours, where D is the ingot diameter in cm, to allow the components in the steel to diffuse evenly, then cool it to the forging temperature of 1200°C.

[0090] Step 4, upsetting: The 1200°C electroslag ingot is upset to 30% of the ingot height on a press, then finished and returned to the furnace for heating for 4 hours; then a second upsetting to 50% of the height is performed, followed by finishing, and the final forging temperature is always maintained at 1250°C;

[0091] Step 5, drawing: the steel ingot after the secondary repeated upsetting is drawn and forged to the final size to obtain a module, the final forging temperature is maintained at 1250°C, and after drawing, it is pit cooled to 350°C;

[0092] Step 6, ultra-fine treatment: heat the module to 1100℃ and hold it for 0.3×d hours, where d is the effective thickness of the forging in cm. Water quench it to about 100℃, then heat it to 870±10℃ and hold it isothermal for 0.6×d hours, where d is the effective thickness of the forging in cm. Then, cool it to 550℃ with the furnace door slightly open, then quickly heat it to 750±10℃ and hold it isothermal for 1.2×d hours, where d is the effective thickness of the forging in cm. Then, cool it to 300℃ and air cool it out of the furnace.

[0093] Step 7, processing the blank into a finished product through a CNC machine tool;

[0094] Step 8, quenching and tempering treatment: heat the module to 1050℃ and keep it for 10 hours, oil quench to about 100℃ and then take it out of the furnace and air cool it.

[0095] Temper immediately, keep the tempering temperature at 600℃ for 10 hours, and temper 3 times.

[0096] Example 3 Preparation of High Wear-Resistant and High Toughness Forged Steel Alloy Material

[0097] Step 1, smelting: Place the raw materials into an electric arc furnace or a medium frequency furnace for smelting. Once the composition meets the requirements, the molten steel is temperature-controlled to 1510°C and cast into a mold of the required specifications to form an electrode steel rod. After cooling and demolding, use a grinding wheel to remove the oxide scale and pit defects on the surface of the electrode rod;

[0098] Step 2, electroslag remelting: Electroslag remelting is performed on the electrode rods, so that the molten steel is filtered through the slag system to remove impurities and then slowly crystallizes and solidifies into electroslag ingots of the required specifications;

[0099] Step 3, high temperature homogenization: heat the round steel ingot to 1210°C and hold it at this temperature for 0.3 × D hours, where D is the ingot diameter in cm, to allow the components in the steel to diffuse evenly, then cool it to the forging temperature of 1160°C.

[0100] Step 4, upsetting: The 1160°C electroslag ingot is upset to 30% of the ingot height on a press, then finished and returned to the furnace for heating for 2.5 hours; then a second upsetting to 50% of the height is performed, followed by finishing, and the final forging temperature is always maintained at 900°C;

[0101] Step 5, drawing: the steel ingot after the secondary repeated upsetting is drawn and forged to the final size to obtain a module, the final forging temperature is maintained at 900°C, and the temperature is cooled to 350°C after drawing;

[0102] Step 6, ultra-fine treatment: heat the module to 1060℃ and hold it for 0.21×d hours, where d is the effective thickness of the forging in cm. Water quench it to about 100℃, then heat it to 870±10℃ and hold it isothermal for 0.45×d hours, where d is the effective thickness of the forging in cm. Then, cool it to 510℃ with the furnace door slightly open, then quickly heat it to 750±10℃ and hold it isothermal for 0.98×d hours, where d is the effective thickness of the forging in cm. Then, cool it to 300℃ and air cool it out of the furnace.

[0103] Step 7, processing the blank into a finished product through a CNC machine tool;

[0104] Step 8, quenching and tempering treatment: heat the module to 1010℃ and keep it for 6 hours, oil quench to about 100℃, take it out of the furnace and air cool it, and immediately temper it at the tempering temperature of 560℃ and keep it for 6 hours, and temper it 3 times.

[0105] Example 4 Preparation of High Wear-Resistant and High Toughness Forged Steel Alloy Material

[0106] Step 1, smelting: The raw materials are placed in an electric arc furnace or a medium frequency furnace for smelting. After the composition meets the requirements, the molten steel is controlled at 1520℃ and cast into a mold of the required specifications to form an electrode steel rod. After cooling and demolding, the surface oxide scale and pit defects of the electrode rod are removed with a grinding wheel machine;

[0107] Step 2, electroslag remelting: Electroslag remelting is performed on the electrode rods, so that the molten steel is filtered through the slag system to remove impurities and then slowly crystallizes and solidifies into electroslag ingots of the required specifications;

[0108] Step 3, high temperature homogenization: heat the round steel ingot to 1220°C and hold it at this temperature for 0.3 × D hours, where D is the ingot diameter in cm, to allow the components in the steel to diffuse evenly, then cool it to the forging temperature of 1170°C.

[0109] Step 4, upsetting: The 1170°C electroslag ingot is upset to 30% of the ingot height on a press, then finished and returned to the furnace for heating for 3 hours; then a second upsetting to 50% of the height is performed, followed by finishing, and the final forging temperature is always maintained above 870°C;

[0110] Step 5, drawing: the steel ingot after the secondary repeated upsetting is drawn and forged to the final size to obtain a module, the final forging temperature is maintained at 1000°C, and the temperature is cooled to 350°C after drawing;

[0111] Step 6, ultra-fine treatment: heat the module to 1070℃ and hold it for 0.23×d hours, where d is the effective thickness of the forging in cm. Water quench it to about 100℃, then heat it to 870±10℃ and hold it isothermal for 0.48×d hours, where d is the effective thickness of the forging in cm. Then, cool it to 520℃ with the furnace door slightly open, then quickly heat it to 750±10℃ and hold it isothermal for 1.0×d hours, where d is the effective thickness of the forging in cm. Then, cool it to 300℃ and air cool it out of the furnace.

[0112] Step 7, processing the blank into a finished product through a CNC machine tool;

[0113] Step 8, quenching and tempering treatment: heat the module to 1020℃ and keep it for 7 hours, oil quench to about 100℃, take it out of the furnace and air cool it, and immediately temper it at the tempering temperature of 570℃ and keep it for 7 hours, and temper it 3 times.

[0114] Example 5 Preparation of High Wear-Resistant and High Toughness Forged Steel Alloy Material

[0115] Step 1, smelting: Place the raw materials into an electric arc furnace or a medium frequency furnace for smelting. Once the composition meets the requirements, the molten steel is temperature-controlled to 1530°C and cast into a mold of the required specifications to form an electrode steel rod. After cooling and demolding, use a grinding wheel to remove oxide scale and pit defects on the surface of the electrode rod.

[0116] Step 2, electroslag remelting: Electroslag remelting is performed on the electrode rods, so that the molten steel is filtered through the slag system to remove impurities and then slowly crystallizes and solidifies into electroslag ingots of the required specifications;

[0117] Step 3, high temperature homogenization: heat the round steel ingot to 1230°C and hold it at this temperature for 0.3 × D hours, where D is the ingot diameter in cm, to allow the components in the steel to diffuse evenly, then cool it to the forging temperature of 1180°C.

[0118] Step 4, upsetting: The 1180°C electroslag ingot is upset to 30% of the ingot height on a press, then finished and returned to the furnace for heating for 3.3 hours; then a second upsetting to 50% of the height is performed, followed by finishing, and the final forging temperature is always maintained at 1050°C;

[0119] Step 5, drawing: the steel ingot after the secondary repeated upsetting is drawn and forged to the final size to obtain a module, the final forging temperature is maintained at 1050°C, and the steel ingot is pit cooled to 350°C after drawing;

[0120] Step 6, ultra-fine treatment: heat the module to 1080℃ and hold it for 0.25×d hours, where d is the effective thickness of the forging in cm. Water quench it to about 100℃, then heat it to 870±10℃ and hold it isothermal for 0.45×d hours, where d is the effective thickness of the forging in cm. Then, cool it to 530℃ with the furnace door slightly open, then quickly heat it to 750±10℃ and hold it isothermal for 1.2×d hours, where d is the effective thickness of the forging in cm. Then, cool it to 300℃ and air cool it out of the furnace.

[0121] Step 7, processing the blank into a finished product through a CNC machine tool;

[0122] Step 8, quenching and tempering treatment: heat the module to 1030℃ and keep it for 8 hours, oil quench to about 100℃, take it out of the furnace and air cool it, and immediately temper it at the tempering temperature of 580℃ and keep it for 8 hours, and temper it 3 times.

[0123] Example 6 Preparation of High Wear-Resistant and High Toughness Forged Steel Alloy Material

[0124] Step 1, smelting: Place the raw materials into an electric arc furnace or a medium frequency furnace for smelting. Once the composition meets the requirements, the molten steel is temperature-controlled to 1540°C and cast into a mold of the required specifications to form an electrode steel rod. After cooling and demolding, use a grinding wheel to remove oxide scale and pit defects on the surface of the electrode rod.

[0125] Step 2, electroslag remelting: Electroslag remelting is performed on the electrode rods, so that the molten steel is filtered through the slag system to remove impurities and then slowly crystallizes and solidifies into electroslag ingots of the required specifications;

[0126] Step 3, high temperature homogenization: heat the round steel ingot to 1240°C and hold it at this temperature for 0.3 × D hours, where D is the ingot diameter in cm, to allow the components in the steel to diffuse evenly, then cool it to the forging temperature of 1190°C.

[0127] Step 4, upsetting: The 1190°C electroslag ingot is upset to 30% of the ingot height on a press, then finished and returned to the furnace for heating for 4 hours; then a second upsetting to 50% of the height is performed, followed by finishing, and the final forging temperature is always maintained at 1100°C;

[0128] Step 5, drawing: the steel ingot after the secondary repeated upsetting is drawn and forged to the final size to obtain a module, the final forging temperature is maintained at 1100°C, and the temperature is cooled to 350°C after drawing;

[0129] Step 6, ultra-fine treatment: heat the module to 1090℃ and hold it for 0.28×d hours, where d is the effective thickness of the forging in cm. Water quench it to about 100℃, then heat it to 870±10℃ and hold it isothermal for 0.6×d hours, where d is the effective thickness of the forging in cm. Then, cool it to 540℃ with the furnace door slightly open, then quickly heat it to 750±10℃ and hold it isothermal for 0.9×d hours, where d is the effective thickness of the forging in cm. Then, cool it to 300℃ and air cool it out of the furnace.

[0130] Step 7, processing the blank into a finished product through a CNC machine tool;

[0131] Step 8, quenching and tempering treatment: heat the module to 1040℃ and keep it for 9 hours, oil quench to about 100℃, take it out of the furnace and air cool it, and immediately temper it at a tempering temperature of 590℃ and keep it for 8 hours, and temper it 3 times.

[0132] The contents of various elements in the high wear-resistant and high toughness forging steel alloy materials in Examples 1-6 of the present invention are shown in the following table:

[0133]

[0134]

[0135] Example 7

[0136] The utility model performs performance tests on the high wear-resistant and high toughness forged steel alloy materials prepared in Examples 1-6 of the utility model, as follows:

[0137] Hardness test:

[0138] For specific operation steps, refer to the national standard GB 230.1-2009

[0139] Wear resistance test:

[0140] Specific operation steps refer to the national standard GB / T12444

[0141] Impact test:

[0142] For specific operation steps, refer to the national standard GB 229-2007

[0143] Tensile strength and elongation test:

[0144] For specific operation steps, refer to the national standard GB 228.1-2010

[0145] The test results are shown in the following table:

[0146]

[0147] The protection content of the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the utility model, any changes and advantages that can be thought of by those skilled in the art are included in the present invention and are protected by the appended claims.

Claims

1. A die forged all-metal lifting strip, characterized in that: include: A lifting bar body (1), wherein the lifting bar body (1) is forged in one piece; Both sides of the bottom surface of the lifting strip body (1) are provided with dovetail grooves (11); the dovetail grooves (11) do not penetrate the lifting strip body (1); The front face of the lifting bar body (1) is provided with an inclined surface (12) serving as a working surface; The depth of the dovetail groove (11) does not exceed the horizontal plane where the bottom of the inclined surface (12) is located.

2. The die-forged all-metal lifting strip according to claim 1, characterized in that: The top of the dovetail groove (11) is provided with a rounded corner R8.

3. The die-forged all-metal lifting strip according to claim 1, characterized in that: The length of the dovetail groove (11) is 45 mm.

4. The die-forged all-metal lifting strip according to claim 1, characterized in that: The narrowest part of the dovetail groove (11) is 21 mm, and the widest part is 36 mm.

5. The die-forged all-metal lifting strip according to claim 1, characterized in that: The bottom of the dovetail groove (11) is 26 mm.

6. The die-forged all-metal lifting strip according to claim 1, characterized in that: The center lines of the dovetail grooves (11) are spaced 60 mm apart.

7. The die-forged all-metal lifting strip according to claim 1, characterized in that: The angle between the back surface of the lifting strip body (1) and the vertical plane is 0-30°.

8. The die-forged all-metal lifting strip according to claim 1, characterized in that: The angle between the back surface of the lifting strip body (1) and the vertical plane is 5°.

9. The die-forged all-metal lifting strip according to claim 1, characterized in that: The angle between the inclined surface (12) and the vertical surface is 15-35 degrees.

10. The die-forged all-metal lifting strip according to claim 1, characterized in that: The angle between the inclined surface (12) and the vertical surface is 26°.

11. The die-forged all-metal lifting strip according to claim 1, characterized in that: The top of the lifting bar body (1) is provided with a rounded corner R30.

12. The die-forged all-metal lifting strip according to claim 1, characterized in that: The distance between the bottom edge of the back of the lifting strip body (1) and the center line of the nearest dovetail groove (11) is 56 mm.

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