Production process of high-alloy cold work die steel

Abstract

The invention belongs to the technical field of alloy, and relates to a production process of high-alloy cold work die steel, which comprises the following steps: mixing iron ore, high-carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, boron-niobium-iron alloy and kaolin, heating in a smelting furnace, heating in quenching equipment at the heating temperature of 850-950 DEG C for the heating time of 25-40 DEG C, and cooling to room temperature to obtain the high-alloy cold work die steel. According to the method, iron ore, high-carbon steel, ferrosilicon alloy, ferrochromium alloy, ferromolybdenum alloy and boron-niobium-iron alloy are heated and then immersed in oil to be rapidly cooled, iron ore, high-carbon steel, ferrosilicon alloy, ferrochromium alloy, ferromolybdenum alloy and boron-niobium-iron alloy are further rapidly mixed, the smelting time of a smelting furnace on raw materials can be shortened, and the strength and hardness of the machined die steel can be enhanced by premixing the raw materials; and the situation that when existing die steel is machined, raw materials cannot be fully mixed due to stacking of the raw materials, and then the raw materials cannot be fully fused in the smelting process is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of alloys, and in particular relates to a production process of high-alloy cold-working die steel. Background Art

[0002] Mold steel is a type of steel used to manufacture molds such as cold stamping dies, hot forging dies, and die-casting dies. Molds are the main processing tools for manufacturing parts in industrial sectors such as machinery manufacturing, radio instruments, motors, and electrical appliances. Mold steel is divided into three categories: cold-rolled mold steel, hot-rolled mold steel, and plastic mold steel. They are used for forging, stamping, cutting, and die-casting.

[0003] Among them, cold-rolled die steel, also known as cold-working die steel, refers to the die steel used to deform or form metal in a cold state. The most commonly used special cold-working die steel is Crl2 steel, which has a carbon content of 1.45% to 2.30% and a chromium content of 11% to 13%. Cold-working die steel is usually based on high carbon in composition to meet the needs of high hardness and high wear resistance.

[0004] Combined with the existing cold working die steel production process, the raw ore is heated and melted. Due to the large particles of the raw ore, the smelting furnace needs a long time to melt the raw ore. At the same time, the various raw ores are not fully mixed before smelting, which makes it difficult to fully mix and melt the raw ores after smelting and quenching. This can easily lead to performance differences between different surfaces of the die steel after forming. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a production process of high alloy cold working die steel to solve the problems described in the above background technology.

[0006] The purpose and effect of the production process of a high-alloy cold-working die steel of the present invention are achieved by the following specific technical means:

[0007] S1 Raw material screening: iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroniobium alloy and kaolin are selected as raw materials. The iron ore is crushed step by step through a crusher, from large pieces of iron ore to 2-5mm fine iron ore.

[0008] S2 Crushing: High carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are respectively fed into a fine jaw crusher for fine crushing. After fine crushing, they are screened by a screening machine. The above steps are repeated 3-5 times. High carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are all screened to a particle size of 1-2 mm to ensure that the particle size required for mold steel production is achieved;

[0009] S3 raw material mixing: the iron ore crushed in step 1 and the high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and ferroniobium alloy screened in step 2 are placed in a mixer. A motor is installed on the side of the mixer, which drives the output bearing to rotate, and the main blades outside the output bearing rotate synchronously;

[0010] S4 further mixing: When the output bearing rotates, inertia is generated, and the sliding ring slides on the outside of the output bearing. The sliding ring drives the auxiliary blade to slide horizontally. Therefore, the auxiliary blade can horizontally mix the iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and ferroniobium-boron alloy. When the auxiliary blade slides, it is stretched to one end of the spring. The spring assists the auxiliary blade to slide back at one end of the connecting rod. The two-way mixing of the main blade and the auxiliary blade is used to further quickly mix the iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and ferroniobium-boron alloy.

[0011] S5 material heating: After mixing, iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroniobium alloy and kaolin are placed in the smelting furnace for heating and heated in the quenching equipment. The heating temperature is 850-950℃ and the heating time is 25-40℃. After heating, they are immersed in oil for rapid cooling.

[0012] S6 quenching and tempering: After heating, the mold steel is placed in the quenching equipment at a temperature of 650-720°C for 30-40s / mm, and then cooled again. After cooling, the mold steel is placed in the quenching equipment again at a temperature of 400-500°C for 1-2h.

[0013] S7 Cooling Forming: After quenching, the mold steel is placed in clean water to cool down to room temperature.

[0014] Preferably, the connecting rod is located at one end of the main blade, and the spring is located between the connecting rod and the auxiliary blade. When the main blade rotates, the main blade drives the auxiliary blade to rotate synchronously through the spring and the connecting rod.

[0015] Preferably, the main blades, sliding rings, auxiliary blades, springs and connecting rods are matched and arranged in 2-3 groups, with an interval of 10-20 cm between each group.

[0016] Preferably, the high carbon steel, ferrosilicon alloy, ferrochromium alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are respectively crushed into a fine jaw crusher, and then sieved by a screening machine. The above steps are repeated 4 times, and the high carbon steel, ferrosilicon alloy, ferrochromium alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are all sieved to a particle size of 1.5 mm to ensure that the particle size required for mold steel production is achieved.

[0017] Preferably, the mixed iron ore, high carbon steel, ferrosilicon alloy, ferrochromium alloy, ferromolybdenum alloy, ferroniobium alloy and kaolin are placed inside a smelting furnace for heating, and heated inside a quenching equipment, with a heating temperature of 900° C. and a heating time of 31° C. After heating, they are immersed in oil for rapid cooling.

[0018] Preferably, the heated mold steel is placed inside a quenching device at a temperature of 700°C for a quenching time of 35s / mm, and then cooled again. After cooling, the mold steel is placed inside the quenching device again at a temperature of 460°C for 1.5h.

[0019] Preferably, the mold steel after quenching is placed in clean water for cooling for 20-40 minutes, the clean water is circulated, and the clean water temperature is 10-15°C.

[0020] Preferably, the inner cavity of the smelting furnace is rectangular.

[0021] Beneficial effects:

[0022] 1. High carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are respectively fed into a fine jaw crusher for fine crushing, and then screened by a screening machine. The above steps are repeated 4 times. High carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are all screened to a particle size of 1.5 mm to ensure that the particle size required for mold steel production is achieved. By repeatedly grinding the raw materials and using the two-way mixing of the main blade and the auxiliary blade, the iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and ferroboron-niobium alloy are further quickly mixed, which can shorten the smelting time of the raw materials in the smelting furnace. By pre-mixing the raw materials, the strength and hardness of the mold steel after processing can be enhanced, avoiding the situation in which the raw materials cannot be fully mixed by superimposing the raw materials during the existing mold steel processing, and then the raw materials cannot be fully fused during the smelting process;

[0023] 2. When the output bearing rotates, inertia is generated, and the sliding ring slides on the outside of the output bearing. The sliding ring drives the auxiliary blade to slide horizontally. Therefore, the auxiliary blade can form a horizontal mixing of iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and ferroboron-niobium alloy. When the auxiliary blade slides, it is stretched to one end of the spring. The spring assists the auxiliary blade to slide back to one end of the connecting rod. The two-way mixing of the main blade and the auxiliary blade is further used to quickly mix the iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and ferroboron-niobium alloy. The rapid mixing of the main and auxiliary materials can assist in subsequent rapid smelting.

[0024] 3. The hardness of the mold steel can be improved by adding high carbon steel. Adding high carbon steel can increase the hardness of the mold steel after quenching;

[0025] By adding 3.7 parts of ferrochrome, the hardness and corrosion resistance of the mold steel can be improved, and excessive ferrochrome can be avoided to reduce the toughness of the mold steel;

[0026] By adding 3 parts of molybdenum iron alloy, the strength and toughness of the mold steel can be improved, and excessive molybdenum iron alloy can be avoided to affect the corrosion resistance and mechanical properties of the mold steel.

[0027] By adding 2.3 parts of boron ferroniobium alloy, the hardness of the mold steel can be significantly improved, and the brittleness of the mold steel caused by excessive boron ferroniobium alloy can be avoided;

[0028] By adding ferrosilicon alloy to improve the hardness and wear resistance of mold steel, ferrosilicon alloy can improve the heat resistance of mold steel, making it less likely to deform and burn in high temperature environment;

[0029] By adding ferrosilicon alloy, ferrochromium alloy, ferromolybdenum alloy and boron ferroniobium alloy, this kind of mold steel can have high alloying properties;

[0030] 4. By evaluating the cold working die steel processed with different values, it can be seen that the overall score of the die steel can reach 93 points, the hardness of the prepared die steel can reach 55, the impact resistance can reach 38J / cm2, and the strength can reach 1610MPa, so the overall performance of the die steel can be significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the mixer of the present invention.

[0032] Figure 2 It is a partial schematic diagram of the mixer of the present invention.

[0033] Figure 3 Schematic diagram of the blade assembly of the present invention.

[0034] Reference numerals: 1-mixer, 101-output bearing, 2-main blade, 3-sliding ring, 4-auxiliary blade, 5-spring, 6-connecting rod. DETAILED DESCRIPTION

[0035] Hereinafter, the present invention will be described with reference to examples. However, the present invention is not limited to the following examples.

[0036] In addition, in the following description, unless otherwise specified, % refers to m / m mass percentage. All reagents, raw materials and instruments used in the present invention are well known in the art and can be purchased from the market, but this does not limit the implementation of the present invention. Other reagents and equipment well known in the art can be applied to the implementation of the following embodiments of the present invention.

[0037] Example 1:

[0038] This embodiment provides a production process for high-alloy cold-working die steel. The production process for high-alloy cold-working die steel comprises, by formula percentage, 150-210 parts of iron ore, 15-22 parts of high-carbon steel, 35-50 parts of ferrosilicon alloy, 3-7 parts of ferrochrome alloy, 2-6 parts of ferromolybdenum alloy, 1-5 parts of ferroboron-niobium alloy, and 0.5-2 parts of kaolin. The iron ore is the primary material, and the high-carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy, and kaolin are auxiliary materials.

[0039] Preferably, the production process of high-alloy cold-working die steel includes, by formula percentage, 198 parts of iron ore, 18 parts of high-carbon steel, 37 parts of ferrosilicon alloy, 3.7 parts of ferrochromium alloy, 3 parts of ferromolybdenum alloy, 2.3 parts of ferroboron-niobium alloy and 1 part of kaolin, and iron ore is the main material, and high-carbon steel, ferrosilicon alloy, ferrochromium alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are auxiliary materials.

[0040] Example 2:

[0041] This embodiment provides a production process for high-alloy cold-working die steel, and the specific steps are as follows:

[0042] S1 Raw material screening: iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroniobium alloy and kaolin are selected as raw materials. The iron ore is crushed step by step through a crusher, from large pieces of iron ore to 2-5mm fine iron ore.

[0043] S2 Crushing: High carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are respectively fed into a fine jaw crusher for fine crushing. After fine crushing, they are screened by a screening machine. The above steps are repeated 3-5 times. High carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are all screened to a particle size of 1-2 mm to ensure that the particle size required for mold steel production is achieved;

[0044] S3 raw material mixing: the iron ore crushed in step 1 and the high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and ferroboron-niobium alloy screened in step 2 are placed into the mixer 1. A motor is provided on the side of the mixer 1. The motor drives the output bearing 101 to rotate, and the main blade 2 outside the output bearing 101 rotates synchronously;

[0045] S4 further mixing: When the output bearing 101 rotates, inertia is generated, and the sliding ring 3 slides on the outside of the output bearing 101. The sliding ring 3 drives the auxiliary blade 4 to slide horizontally. Therefore, the auxiliary blade 4 can horizontally mix the iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and ferroniobium-boron alloy. When the auxiliary blade 4 slides, it is stretched to one end of the spring 5. The spring 5 assists the auxiliary blade 4 to slide back at one end of the connecting rod 6. By utilizing the two-way mixing of the main blade 2 and the auxiliary blade 4, the iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and ferroniobium-boron alloy are further mixed rapidly.

[0046] S5 material heating: After mixing, iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroniobium alloy and kaolin are placed in the smelting furnace for heating and heated in the quenching equipment. The heating temperature is 850-950℃ and the heating time is 25-40℃. After heating, they are immersed in oil for rapid cooling.

[0047] S6 quenching and tempering: After heating, the mold steel is placed in the quenching equipment at a temperature of 650-720°C for 30-40s / mm, and then cooled again. After cooling, the mold steel is placed in the quenching equipment again at a temperature of 400-500°C for 1-2h.

[0048] S7 Cooling Forming: After quenching, the mold steel is placed in clean water to cool down to room temperature;

[0049] Furthermore, the connecting rod 6 is located at one end of the main blade 2, and the spring 5 is located between the connecting rod 6 and the auxiliary blade 4. When the main blade 2 rotates, the main blade 2 drives the auxiliary blade 4 to rotate synchronously through the spring 5 and the connecting rod 6;

[0050] Furthermore, the main blade 2, the sliding ring 3, the auxiliary blade 4, the spring 5 and the connecting rod 6 are matched and arranged in 2-3 groups, with an interval of 10-20 cm between each group;

[0051] Further, the high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are respectively fed into a fine jaw crusher for fine crushing, and then sieved through a screening machine after fine crushing. The above steps are repeated 4 times, and the high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are all sieved to a particle size of 1.5 mm to ensure that the particle size required for mold steel production is achieved;

[0052] Furthermore, the mixed iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroniobium alloy and kaolin are placed in a smelting furnace for heating, and heated in a quenching device at a temperature of 900° C. for a heating time of 31° C. After heating, the mixture is immersed in oil for rapid cooling;

[0053] Furthermore, the heated mold steel was placed in a quenching device at a temperature of 700°C for a quenching time of 35 s / mm, and then cooled again. After cooling, the mold steel was placed in a quenching device again at a temperature of 460°C for a quenching time of 1.5 h.

[0054] Furthermore, after quenching, the mold steel is placed in clean water for cooling for 20-40 minutes, the clean water is circulated, and the clean water temperature is 10-15°C;

[0055] Furthermore, the inner cavity of the smelting furnace is rectangular.

[0056] Example 3:

[0057] High carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are respectively sent to the fine jaw crusher for fine crushing, and then screened by the screening machine after fine crushing. The above steps are repeated 4 times. High carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are all screened to a particle size of 1.5 mm to ensure that the particle size required for mold steel production is achieved. By repeatedly grinding the raw materials and using the two-way mixing of the main blade 2 and the auxiliary blade 4, the iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and ferroboron-niobium alloy are further quickly mixed, which can shorten the smelting time of the raw materials in the smelting furnace. By pre-mixing the raw materials, the strength and hardness of the mold steel after processing can be enhanced, avoiding the situation in which the raw materials cannot be fully mixed by superimposing the raw materials during the existing mold steel processing, and then the raw materials cannot be fully fused during the smelting process.

[0058] Example 4:

[0059] When the output bearing 101 rotates, inertia is generated, and the sliding ring 3 slides on the outside of the output bearing 101. The sliding ring 3 drives the auxiliary blade 4 to slide horizontally, so the auxiliary blade 4 can form a horizontal mixture of iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and boron niobium ferroalloy. When the auxiliary blade 4 slides, it is stretched to one end of the spring 5. The spring 5 assists the auxiliary blade 4 to slide back at one end of the connecting rod 6. By utilizing the two-way mixing of the main blade 2 and the auxiliary blade 4, the iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and boron niobium ferroalloy are further quickly mixed. By quickly mixing the main material and the auxiliary material, it can assist in subsequent rapid smelting.

[0060] Embodiment 5:

[0061] The hardness of the mold steel can be increased by adding high carbon steel, and the hardness of the mold steel after quenching can be increased by adding high carbon steel;

[0062] By adding 3.7 parts of ferrochrome, the hardness and corrosion resistance of the mold steel can be improved, and excessive ferrochrome can be avoided to reduce the toughness of the mold steel;

[0063] By adding 3 parts of molybdenum iron alloy, the strength and toughness of the mold steel can be improved, and excessive molybdenum iron alloy can be avoided to affect the corrosion resistance and mechanical properties of the mold steel.

[0064] By adding 2.3 parts of boron ferroniobium alloy, the hardness of the mold steel can be significantly improved, and the brittleness of the mold steel caused by excessive boron ferroniobium alloy can be avoided;

[0065] By adding ferrosilicon alloy to improve the hardness and wear resistance of mold steel, ferrosilicon alloy can improve the heat resistance of mold steel, making it less likely to deform and burn in high temperature environment;

[0066] This type of mold steel is made highly alloyed by adding ferrosilicon, ferrochromium, ferromolybdenum and ferroboron-niobium.

[0067] Example 6:

[0068] Iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are selected as raw materials. The iron ore is crushed step by step by a crusher, and the large iron ore is crushed step by step to 2mm iron ore fine material. High carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are respectively sent to a fine jaw crusher for fine crushing. After fine crushing, they are screened by a screening machine. The above steps are repeated 3 times. High carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are respectively sent to a fine jaw crusher for fine crushing. After fine crushing, they are screened by a screening machine. The above steps are repeated 3 times. Kaolin is screened to a particle size of 1 mm to ensure that the particle size required for mold steel production is achieved. The crushed iron ore and the screened high-carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and ferroniobium-boron alloy are placed inside the mixer 1. A motor is provided on the side of the mixer 1. The motor drives the output bearing 101 to rotate. The main blade 2 outside the output bearing 101 rotates synchronously. When the output bearing 101 rotates, inertia is generated. The sliding ring 3 slides on the outside of the output bearing 101, and the sliding ring 3 drives the auxiliary blade 4 to slide horizontally. Therefore, the auxiliary blade 4 can form a horizontal mixture of iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and boron niobium alloy. When the auxiliary blade 4 slides, it stretches to one end of the spring 5. The spring 5 assists the auxiliary blade 4 to slide back at one end of the connecting rod 6. The two-way mixing of the main blade 2 and the auxiliary blade 4 is used to further quickly mix the iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and boron niobium alloy. After mixing, the iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, boron niobium alloy and kaolin are placed inside the melting furnace for heating, and heated inside the quenching equipment. The heating temperature is 850℃ and the heating time is 25℃. After heating, it is immersed in oil for rapid cooling. After heating, the mold steel is placed inside the quenching equipment. The quenching equipment temperature is 650℃ and the quenching time is 30s / mm. Then it is cooled again. After cooling, the mold steel is placed inside the quenching equipment again. The quenching equipment temperature is 400℃ and the time is 1h. After quenching, the mold steel is placed in clean water for cooling and cooled to room temperature.

[0069] Embodiment seven:

[0070] Iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are selected as raw materials. The iron ore is crushed step by step by a crusher, and the large iron ore is crushed step by step to 3.5mm iron ore fine material. High carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are respectively sent to a fine jaw crusher for fine crushing. After fine crushing, they are screened by a screening machine. The above steps are repeated 4 times. High carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are respectively sent to a fine jaw crusher for fine crushing. After fine crushing, they are screened by a screening machine. The above steps are repeated 4 times. The kaolin is screened to a particle size of 1.5 mm to ensure that the particle size required for mold steel production is achieved. The crushed iron ore and the screened high-carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and ferroboron-niobium alloy are placed in the mixer 1. A motor is provided on the side of the mixer 1. The motor drives the output bearing 101 to rotate. The main blade 2 outside the output bearing 101 rotates synchronously. When the output bearing 101 rotates, inertia is generated. The sliding ring 3 slides on the outside of the output bearing 101. The sliding ring 3 drives the auxiliary blade 4 to slide horizontally. The auxiliary blade 4 is movable, so the auxiliary blade 4 can form a horizontal mixture of iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and boron niobium alloy. When the auxiliary blade 4 slides, it stretches to one end of the spring 5. The spring 5 assists the auxiliary blade 4 to slide back at one end of the connecting rod 6. The two-way mixing of the main blade 2 and the auxiliary blade 4 is used to further quickly mix the iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and boron niobium alloy. After mixing, the iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, boron niobium alloy and kaolin are placed inside the melting furnace for heating, and heated inside the quenching equipment, the heating temperature is 900℃, the heating time is 32℃, and after heating, it is immersed in oil for rapid cooling. After heating, the mold steel is placed inside the quenching equipment, the quenching equipment temperature is 685℃, the quenching time is 35s / mm, and then cooled again. After cooling, the mold steel is placed inside the quenching equipment again, the quenching equipment temperature is 450℃, and the time is 1.5h. After quenching, the mold steel is placed in clean water for cooling and cooled to room temperature.

[0071] Embodiment 8:

[0072] Iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are selected as raw materials. The iron ore is crushed step by step by a crusher, and the large iron ore is crushed step by step to 5mm iron ore fine material. High carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are respectively sent to a fine jaw crusher for fine crushing. After fine crushing, they are screened by a screening machine. The above steps are repeated 5 times. High carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are respectively sent to a fine jaw crusher for fine crushing. After fine crushing, they are screened by a screening machine. The above steps are repeated 5 times. Kaolin is screened to a particle size of 2 mm to ensure that the particle size required for mold steel production is achieved. The crushed iron ore and the screened high-carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and ferroniobium-boron alloy are placed in the mixer 1. A motor is provided on the side of the mixer 1. The motor drives the output bearing 101 to rotate. The main blade 2 outside the output bearing 101 rotates synchronously. When the output bearing 101 rotates, inertia is generated. The sliding ring 3 slides on the outside of the output bearing 101, and the sliding ring 3 drives the auxiliary blade 4 to slide horizontally. Therefore, the auxiliary blade 4 can form a horizontal mixture of iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and boron niobium alloy. When the auxiliary blade 4 slides, it stretches to one end of the spring 5. The spring 5 assists the auxiliary blade 4 to slide back at one end of the connecting rod 6. The two-way mixing of the main blade 2 and the auxiliary blade 4 is used to further quickly mix the iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and boron niobium alloy. After mixing, the iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, boron niobium alloy and kaolin are placed inside the melting furnace for heating, and heated inside the quenching equipment, the heating temperature is 950℃, the heating time is 40℃, and after heating, it is immersed in oil for rapid cooling. After heating, the mold steel is placed inside the quenching equipment, the quenching equipment temperature is 720℃, the quenching time is 40s / mm, and then cooled again. After cooling, the mold steel is placed inside the quenching equipment again, the quenching equipment temperature is 500℃, and the time is 2h. After quenching, the mold steel is placed in clean water for cooling and cooled to room temperature.

[0073] Embodiment 9:

[0074] The cold working die steels produced with different values ​​in Examples 6-8 were evaluated based on hardness, impact resistance and strength;

[0075] Table 1: Cold work die steel evaluation table

[0076]

[0077]

[0078] By evaluating the cold working die steel processed with different values, it can be found that the overall score of the cold working die steel processed in Example 7 can reach 93 points, the hardness of the prepared die steel can reach 55, the impact resistance can reach 38J / cm2, and the strength can reach 1610MPa, so the overall performance of the die steel can be significantly improved.

[0079] Technical personnel should note: Although the present invention has been described according to the above specific implementation methods, the inventive concept of the present invention is not limited to this invention. Any modification using the inventive concept will be included in the scope of protection of this patent.

Claims

1. A production process for high alloy cold working die steel, characterized by: The production process of the high alloy cold working die steel comprises the following steps: S1 Raw material screening: iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroniobium alloy and kaolin are selected as raw materials. The iron ore is crushed step by step through a crusher, from large pieces of iron ore to 2-5mm fine iron ore. S2 Crushing: High carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are respectively fed into a fine jaw crusher for fine crushing. After fine crushing, they are screened by a screening machine. The above steps are repeated 3-5 times. High carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin are all screened to a particle size of 1-2 mm to ensure that the particle size required for mold steel production is achieved; S3 raw material mixing: the iron ore crushed in step 1 and the high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and ferroniobium alloy screened in step 2 are all placed in a mixer (1). A motor is provided on the side of the mixer (1), and the motor drives the output bearing (101) to rotate, and the main blade (2) outside the output bearing (101) rotates synchronously; S4 further mixes: when the output bearing (101) rotates, inertia is generated, and the sliding ring (3) slides on the outer side of the output bearing (101). The sliding ring (3) drives the auxiliary blade (4) to slide horizontally, so that the auxiliary blade (4) can form a horizontal mix of the iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and boron niobium alloy. When the auxiliary blade (4) slides, it stretches to one end of the spring (5). The spring (5) assists the auxiliary blade (4) to slide back at one end of the connecting rod (6). By utilizing the two-way mixing of the main blade (2) and the auxiliary blade (4), the iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy and boron niobium alloy are further mixed quickly. S5 material heating: After mixing, iron ore, high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroniobium alloy and kaolin are placed in the smelting furnace for heating and heated in the quenching equipment. The heating temperature is 850-950℃ and the heating time is 25-40℃. After heating, they are immersed in oil for rapid cooling. S6 quenching and tempering: After heating, the mold steel is placed in the quenching equipment at a temperature of 650-720°C for 30-40s / mm, and then cooled again. After cooling, the mold steel is placed in the quenching equipment again at a temperature of 400-500°C for 1-2h. S7 Cooling Forming: After quenching, the mold steel is placed in clean water to cool down to room temperature.

2. The production process of high alloy cold working die steel according to claim 1, characterized in that: The connecting rod (6) is located at one end of the main blade (2), and the spring (5) is located between the connecting rod (6) and the auxiliary blade (4). When the main blade (2) rotates, the main blade (2) drives the auxiliary blade (4) to rotate synchronously through the spring (5) and the connecting rod (6).

3. The production process of high alloy cold working die steel according to claim 1, characterized in that: The main blade (2), sliding ring (3), auxiliary blade (4), spring (5) and connecting rod (6) are matched and arranged in 2-3 groups, with an interval of 10-20 cm between each group.

4. The production process of high alloy cold working die steel according to claim 1, characterized in that: When the high carbon steel, ferrosilicon alloy, ferrochrome alloy, ferromolybdenum alloy, ferroboron-niobium alloy and kaolin enter the fine jaw crusher for fine crushing, the screening machine is located at the lower end of the fine jaw crusher.

5. The production process of high alloy cold working die steel according to claim 1, characterized in that: The inner cavity of the smelting furnace is rectangular.

6. The production process of high alloy cold working die steel according to claim 1, characterized in that: The mold steel after quenching is placed in clean water for cooling for 20-40 minutes, the clean water is circulated and the temperature of the clean water is 10-15°C.

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