Novel H14 die steel manufacturing process and application method thereof

Abstract

The invention belongs to the technical field of changing physical structures of black metal, and relates to a novel H14 die steel manufacturing process and an application method thereof.The novel H14 die steel manufacturing process is characterized in that alloy steel is placed in a smelting furnace, a pipeline penetrates through one side of the smelting furnace and is provided with a gate valve in a matched mode, and a transmission rod is manually driven to rotate and a hydraulic telescopic rod drives the gate valve to horizontally move; alloy steel in the smelting furnace can be further stirred, meanwhile, impurities in the alloy steel are assisted to be fully smelted in the smelting furnace, then the smelting furnace is assisted to efficiently remove the impurities in the alloy steel, and then the impurities in the alloy steel in the smelting furnace can be removed through horizontal operation of a gate valve; by means of the structure, the alloy steel smelting time of the smelting furnace can be greatly shortened, and the smelting time is shortened to 5-10 min.

Description

Technical Field

[0001] The invention belongs to the technical field of changing the physical structure of ferrous metals, and in particular relates to a novel H14 die steel manufacturing process and an application method thereof. Background Art

[0002] H14 is a type of tool steel. H14 mold steel belongs to the chromium-tungsten type hot work mold steel. It has higher red hardness and wear resistance than the chromium-molybdenum type hot work mold steel represented by H13. This steel is usually used to manufacture tools and molds that require high hardness and wear resistance. H14 mold steel usually contains a certain proportion of carbon, chromium, molybdenum and vanadium elements. By adding a certain proportion of carbon, chromium, molybdenum and vanadium elements, the hardness, wear resistance and heat treatment performance of H14 mold steel can be improved.

[0003] After proper heat treatment, H14 mold steel can reach very high hardness, making H14 mold steel suitable for making tools that withstand high stress. Due to the alloy elements contained in H14 mold steel, H14 steel has good wear resistance. H14 mold steel can be optimized through different heat treatment processes, such as quenching and tempering. Due to its high hardness and wear resistance, H14 mold steel is often used to make plastic molds, stamping molds and other types of molds, or for making cutting tools such as drills and milling cutters. At the same time, due to its good dimensional stability and high hardness, it is suitable for making tools that require high precision.

[0004] According to the existing technology, H14 mold steel needs to be poured into the mold for forming after smelting. Since H14 mold steel is smelted in an electric arc furnace and the molten H14 mold steel liquid needs to be poured after smelting, different molds need to be adjusted according to the application direction of the H14 mold steel during the pouring process. As a result, it is inconvenient to quickly change the mold during the pouring process of the H14 mold steel liquid, which in turn easily causes the H14 mold steel liquid to cool and condense during the pouring process.

[0005] At the same time, the raw material of H14 mold steel is usually alloy steel, which contains impurities. Therefore, the alloy steel needs to be melted to remove the impurities inside the alloy steel. The alloy steel is usually statically melted in a melting furnace, which requires a long time to melt the alloy steel. The melting furnace cannot assist in stirring and melting the alloy steel during the melting process. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a new H14 die steel manufacturing process and application method thereof to solve the problems described in the above background technology.

[0007] The purpose and efficacy of the novel H14 die steel manufacturing process and its application method of the present invention are achieved by the following specific technical means:

[0008] S1 raw material ratio: 0.32%-0.42% C, 0.30%-0.50% Si, 0.30%-0.50% Mn, 0%-0.20% P, 0%-0.20% S, 11%-13% Cr, 0.60-0.90% V, 0.70%-1.20% Mo, and the balance is alloy steel;

[0009] S2 impurity smelting: Alloy steel is placed inside the smelting furnace. A pipe is passed through one side of the smelting furnace. The pipe is equipped with a gate valve. The gate valve is driven horizontally by the manual rotation of the transmission rod and the hydraulic telescopic rod;

[0010] S3 mixed smelting: When the gate valve moves horizontally, the gate valve drives the rotating shaft to slide synchronously. The rotating shaft drives the sliding frame to slide on the inner wall of the pipeline track through the cross arm. The sliding of the cross arm can drive the rotating bearing to slide and rotate as a whole. The outer blades of the rotating bearing rotate synchronously. Therefore, the horizontal movement of the gate valve is used to remove alloy steel impurities inside the smelting furnace. The smelting time of the smelting furnace is 5-10 minutes.

[0011] S4 Proportioning Melting: The alloy steel solution after impurities are removed in the step and the carbon, silicon, manganese, phosphorus, sulfur, chromium, vanadium and molybdenum in the proportions in the step are placed in an electric arc furnace. The temperature inside the electric arc furnace is 2560-2950°C and the heating time is 1-3 hours. After heating, the mold steel liquid is obtained. Subsequently, oxygen is injected into the steel liquid to perform an oxidation-reduction reaction to remove impurities and gases in the steel liquid.

[0012] S5 vacuum degassing: The molten steel is sucked into the vacuum chamber of the vacuum furnace, and then argon is blown into the molten steel. Under high temperature and vacuum conditions, the argon expands, causing the density of the molten steel and gas mixture to decrease, so that it enters the vacuum chamber under the action of pressure difference. Under the action of high vacuum, the gas in the molten steel is released, and the molten steel is sprayed into fine droplets, further enhancing the degassing effect;

[0013] S6 Forging: The molten steel in step (5) is cast under vacuum conditions to reduce the content of gas and inclusions, and then poured into the mold. During the pouring process, the molds are horizontally fitted together and manually pushed to the pouring port of the mold steel liquid to assist the mold steel liquid to pour quickly;

[0014] S7 cooling: Spraying water is used for cooling. The wastewater generated after spraying is filtered and cooled again, and can be recycled. After cooling, the mold steel workpiece is obtained;

[0015] S8 quenching: After cooling, the mold steel workpiece is placed in the quenching furnace. The internal temperature of the quenching furnace is 500-700℃. The mold steel workpiece is kept warm for 30-40 minutes for preheating. Then the internal temperature of the quenching furnace is raised to 1000-1200℃ and kept warm for 40-60 minutes. Then the mold steel workpiece is taken out and cooled. The cooling time is 30-40 minutes.

[0016] S9 tempering: After cooling, the mold steel workpiece is placed in the tempering furnace. The internal temperature of the tempering furnace is 600-700℃, the tempering time is 50-60min, and the number of times is 2-3 times. After tempering, the mold steel workpiece is cooled to complete the production;

[0017] S10 Application: The shape of the mold used for pouring the molten steel in step (3) is selected according to the desired application direction of the mold steel. Different molds are selected, and the prepared mold steel workpiece can be applied to plastic molds, stamping molds and cutting tools.

[0018] Preferably, the pipeline is a pipeline at the outlet of the smelting furnace.

[0019] Preferably, a track is provided on the inner side of the pipeline, one end of the sliding frame slides inside the track, the other end of the sliding frame is connected to the cross arm, one side of the gate valve is rotatably connected to a rotating shaft, the rotating shaft is rotatably connected to the cross arm, a rotary bearing is rotatably connected to the end of the cross arm away from the gate valve, the outer side of the rotary bearing is surrounded by blades, and the rotary bearing passes through the interior of the smelting furnace.

[0020] Preferably, the molds used for pouring the mold steel liquid are arranged at the upper end of the pulley block, and by pushing the molds, the molds move horizontally at the upper end of the pulley block, and the diameter of the pulley block is 1-3 cm.

[0021] Beneficial effects:

[0022] 1. When the gate valve moves horizontally, the gate valve drives the rotating shaft to slide synchronously. The rotating shaft drives the sliding frame to slide on the inner wall of the pipeline track through the cross arm. The sliding of the cross arm can drive the rotating bearing as a whole to slide and rotate. The outer blades of the rotating bearing rotate synchronously. The rotation of the rotating bearing and the blades can further stir the alloy steel inside the smelting furnace, and at the same time assist the impurities inside the alloy steel to be fully melted inside the smelting furnace, thereby assisting the smelting furnace to achieve efficient removal of impurities inside the alloy steel. The horizontal operation of the gate valve can be used to remove impurities in the alloy steel inside the smelting furnace. The above structure can greatly shorten the smelting time of the alloy steel in the smelting furnace, and the smelting time is shortened to 5-10 minutes.

[0023] 2. Pour the heated mold steel liquid into the mold. During the pouring process, the molds are horizontally fitted together and manually pushed. The molds are pushed to the pouring port of the mold steel liquid to assist in quickly pouring the mold steel liquid. The molds used for pouring the mold steel liquid are arranged at the upper end of the pulley block. By pushing the molds, the molds move horizontally at the upper end of the pulley block. The diameter of the pulley block is 1-3 cm. The pulley block diameter is set to avoid the inconvenience of the mold moving downward at the upper end of the pulley block due to the pulley block diameter being too large. At the same time, the pulley block assists the mold to move quickly to the pouring port of the mold steel liquid, which facilitates the rapid pouring of the mold steel liquid into the mold and avoids the mold steel liquid cooling and condensing during the pouring process, causing the mold steel liquid to adhere to the inside of the melting furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the gate valve of the smelting furnace of the present invention.

[0025] Figure 2 Schematic diagram of the shaft assembly of the present invention.

[0026] Reference numerals: 1-pipeline, 2-gate valve, 3-rotating shaft, 4-cross arm, 5-sliding frame, 6-rotating bearing, 7-blade. DETAILED DESCRIPTION

[0027] Hereinafter, the present invention will be described with reference to examples. However, the present invention is not limited to the following examples.

[0028] 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.

[0029] Example 1:

[0030] This embodiment provides a novel H14 die steel manufacturing process and application method, and the specific steps are as follows:

[0031] S1 raw material ratio: 0.32%-0.42% C, 0.30%-0.50% Si, 0.30%-0.50% Mn, 0%-0.20% P, 0%-0.20% S, 11%-13% Cr, 0.60-0.90% V, 0.70%-1.20% Mo, and the balance is alloy steel;

[0032] S2 impurity smelting: The alloy steel is placed inside the smelting furnace. A pipe 1 is passed through one side of the smelting furnace. The pipe 1 is equipped with a gate valve 2. The gate valve 2 is driven horizontally by the manual rotation of the transmission rod and the hydraulic telescopic rod;

[0033] S3 mixed smelting: When the gate valve 2 moves horizontally, the gate valve 2 drives the rotating shaft 3 to slide synchronously. The rotating shaft 3 drives the sliding frame 5 to slide on the inner wall of the track of the pipeline 1 through the cross arm 4. The sliding of the cross arm 4 can drive the rotating bearing 6 to slide and rotate as a whole. The outer blades 7 of the rotating bearing 6 rotate synchronously. Therefore, the horizontal movement of the gate valve 2 is used to remove impurities in the alloy steel inside the smelting furnace. The smelting time of the smelting furnace is 5-10 minutes.

[0034] S4 Proportioned Melting: The alloy steel solution after impurities are removed in step 3 and the carbon, silicon, manganese, phosphorus, sulfur, chromium, vanadium and molybdenum proportioned in step 1 are placed inside an electric arc furnace. The temperature inside the electric arc furnace is 2560-2950°C and the heating time is 1-3 hours. After heating, the mold steel liquid is obtained. Subsequently, oxygen is injected into the steel liquid to perform an oxidation-reduction reaction to remove impurities and gases in the steel liquid.

[0035] S5 vacuum degassing: The molten steel is sucked into the vacuum chamber of the vacuum furnace, and then argon is blown into the molten steel. Under high temperature and vacuum conditions, the argon expands, causing the density of the molten steel and gas mixture to decrease, so that it enters the vacuum chamber under the action of pressure difference. Under the action of high vacuum, the gas in the molten steel is released, and the molten steel is sprayed into fine droplets, further enhancing the degassing effect;

[0036] S6 Forging: The molten steel in step (5) is cast under vacuum conditions to reduce the content of gas and inclusions, and then poured into the mold. During the pouring process, the molds are horizontally fitted together and manually pushed to the pouring port of the mold steel liquid to assist the mold steel liquid to pour quickly;

[0037] S7 cooling: Spraying water is used for cooling. The wastewater generated after spraying is filtered and cooled again, and can be recycled. After cooling, the mold steel workpiece is obtained;

[0038] S8 quenching: After cooling, the mold steel workpiece is placed in the quenching furnace. The internal temperature of the quenching furnace is 500-700℃. The mold steel workpiece is kept warm for 30-40 minutes for preheating. Then the internal temperature of the quenching furnace is raised to 1000-1200℃ and kept warm for 40-60 minutes. Then the mold steel workpiece is taken out and cooled. The cooling time is 30-40 minutes.

[0039] S9 tempering: After cooling, the mold steel workpiece is placed in the tempering furnace. The internal temperature of the tempering furnace is 600-700℃, the tempering time is 50-60min, and the number of times is 2-3 times. After tempering, the mold steel workpiece is cooled to complete the production;

[0040] S10 Application: The shape of the mold used for pouring the molten steel in step (3) is selected according to the desired application direction of the mold steel. The prepared mold steel workpiece can be applied to plastic molds, stamping molds and cutting tools;

[0041] Pipeline 1 is the outlet pipe of the smelting furnace;

[0042] A track is provided on the inner side of the pipe 1. One end of a sliding frame 5 slides inside the track. The other end of the sliding frame 5 is connected to a cross arm 4. A rotating shaft 3 is rotatably connected to one side of the gate valve 2. The rotating shaft 3 is rotatably connected to the cross arm 4. A rotary bearing 6 is rotatably connected to the end of the cross arm 4 away from the gate valve 2. A blade 7 surrounds the outer side of the rotary bearing 6. The rotary bearing 6 extends through the interior of the smelting furnace.

[0043] The molds used to pour the mold steel liquid are arranged on the upper end of the pulley block. By pushing the molds, the molds move horizontally on the upper end of the pulley block. The diameter of the pulley block is 1-3 cm.

[0044] When the gate valve 2 moves horizontally, the gate valve 2 drives the rotating shaft 3 to slide synchronously. The rotating shaft 3 drives the sliding frame 5 to slide on the inner wall of the track of the pipeline 1 through the cross arm 4. The sliding of the cross arm 4 can drive the rotating bearing 6 to slide and rotate as a whole. The outer blades 7 of the rotating bearing 6 rotate synchronously. Therefore, the horizontal operation of the gate valve 2 is used to remove impurities in the alloy steel inside the smelting furnace. The smelting time of the smelting furnace is 8 minutes.

[0045] The alloy steel solution after removing impurities in step 3 and the carbon, silicon, manganese, phosphorus, sulfur, chromium, vanadium and molybdenum in the proportions in step 1 are placed in an electric arc furnace. The internal temperature of the electric arc furnace is 2750°C and the heating time is 2 hours. After heating, the mold steel liquid is obtained;

[0046] After cooling, the mold steel workpiece is placed in a quenching furnace with an internal temperature of 580°C. The mold steel workpiece is kept warm for 36 minutes for preheating. The internal temperature of the quenching furnace is then raised to 1100°C and kept warm for 55 minutes. The mold steel workpiece is then taken out and cooled for 37 minutes.

[0047] After cooling, the mold steel workpiece is placed in a tempering furnace. The internal temperature of the tempering furnace is 680°C, the tempering time is 58 minutes, and the number of times is 2. After tempering, the mold steel workpiece is cooled to complete the production.

[0048] It uses 0.38% C, 0.40% Si, 0.41% Mn, 0.1% P, 0.11% S, 12.2% Cr, 0.76% V, 0.95% Mo, and the remainder is alloy steel.

[0049] Example 2:

[0050] When the gate valve 2 moves horizontally, the gate valve 2 drives the rotating shaft 3 to slide synchronously, and the rotating shaft 3 drives the sliding frame 5 to slide on the inner wall of the track of the pipeline 1 through the cross arm 4. The sliding of the cross arm 4 can drive the rotating bearing 6 to slide and rotate as a whole, and the outer blades 7 of the rotating bearing 6 rotate synchronously. Through the rotation of the rotating bearing 6 and the blades 7, the alloy steel inside the smelting furnace can be further stirred, and at the same time, the impurities inside the alloy steel are assisted to be fully smelted inside the smelting furnace, thereby assisting the smelting furnace to achieve efficient removal of impurities inside the alloy steel, and then the horizontal operation of the gate valve 2 can be used to achieve the removal of impurities in the alloy steel inside the smelting furnace. The above structure can greatly shorten the smelting time of the alloy steel in the smelting furnace, and the smelting time is shortened to 5-10 minutes.

[0051] Example 3:

[0052] The heated mold steel liquid is poured into the mold. During the pouring process, the molds are horizontally fitted together and manually pushed. The molds are pushed to the pouring port of the mold steel liquid to assist in the rapid pouring of the mold steel liquid. The molds used for pouring the mold steel liquid are arranged on the upper end of the pulley block. By pushing the molds, the molds move horizontally at the upper end of the pulley block. The diameter of the pulley block is 1-3 cm. The pulley block diameter is set to avoid the inconvenience of the mold moving downward at the upper end of the pulley block due to the pulley block diameter being too large. At the same time, the pulley block assists the mold to move quickly to the pouring port of the mold steel liquid, facilitating the rapid pouring of the mold steel liquid into the mold, and avoiding the mold steel liquid cooling and condensing during the pouring process, causing the mold steel liquid to adhere to the inside of the melting furnace;

[0053] Example 4:

[0054] The alloy steel is made of 0.32% C, 0.30% Si, 0.30% Mn, 0.10% P, 0.10% S, 11% Cr, 0.60% V, 0.70% Mo, and the remainder. First, the alloy steel is placed inside the melting furnace. A pipe 1 is passed through one side of the melting furnace. The pipe 1 is equipped with a gate valve 2. The gate valve 2 is driven horizontally by the manual rotation of the transmission rod and the hydraulic telescopic rod. When the gate valve 2 moves horizontally, the gate valve 2 drives the rotating shaft 3 to slide synchronously. The rotating shaft 3 drives the sliding frame 5 to slide on the inner wall of the track of the pipe 1 through the cross arm 4. Through the sliding of the cross arm 4, it can The rotating bearing 6 is driven to slide and rotate as a whole, and the outer blades 7 of the rotating bearing 6 rotate synchronously. Therefore, the horizontal operation of the gate valve 2 is used to remove impurities in the alloy steel inside the smelting furnace. The smelting time of the smelting furnace is 5 minutes. The alloy steel solution after impurities are removed and the proportion of carbon, silicon, manganese, phosphorus, sulfur, chromium, vanadium and molybdenum are placed inside the electric arc furnace. The temperature inside the electric arc furnace is 2560℃, and the heating time is 1 hour. After heating, it becomes mold steel liquid. Subsequently, oxygen is sprayed into the steel liquid to carry out redox reaction to remove impurities and gases in the steel liquid. The steel liquid is then sucked into the vacuum chamber of the vacuum furnace. Then, argon is blown into the molten steel. Under high temperature and vacuum conditions, the argon expands, causing the density of the molten steel and gas mixture to decrease, and then enters the vacuum chamber under the action of pressure difference. Under the action of high vacuum, the gas in the molten steel is released, and the molten steel is sprayed into fine droplets, further increasing the degassing effect. The molten steel is cast under vacuum conditions to reduce the content of gas and inclusions, and then poured into the mold. During the pouring process, the molds are horizontally fitted together and manually pushed. The molds are pushed to the pouring port of the mold steel liquid to assist the mold steel liquid to pour quickly, and spray water cooling is used. The wastewater generated after spraying is filtered and cooled again, and can be recycled and reused. After cooling, the mold steel workpiece is obtained. After cooling, the mold steel workpiece is placed in a quenching furnace with an internal temperature of 500°C. The mold steel workpiece is kept warm for 30 minutes for preheating, and then the internal temperature of the quenching furnace is raised to 1000°C and kept warm for 40 minutes. The mold steel workpiece is then taken out and cooled for 30 minutes. After cooling, the mold steel workpiece is placed in a tempering furnace with an internal temperature of 600°C and a tempering time of 50 minutes, twice. After tempering, the mold steel workpiece is cooled to complete the production.

[0055] Embodiment 5:

[0056] The alloy steel is made of 0.36% C, 0.35% Si, 0.35% Mn, 0.13% P, 0.12% S, 11.5% Cr, 0.65% V, 0.85% Mo, and the remainder. First, the alloy steel is placed inside the melting furnace. A pipe 1 runs through one side of the melting furnace. The pipe 1 is equipped with a gate valve 2. The gate valve 2 is driven horizontally by the manual rotation of the transmission rod and the hydraulic telescopic rod. When the gate valve 2 moves horizontally, the gate valve 2 drives the rotating shaft 3 to slide synchronously. The rotating shaft 3 drives the sliding frame 5 to slide on the inner wall of the track of the pipe 1 through the cross arm 4. Through the sliding of the cross arm 4, It can drive the rotary bearing 6 to slide and rotate as a whole, and the outer blades 7 of the rotary bearing 6 rotate synchronously. Therefore, the horizontal operation of the gate valve 2 is used to remove impurities in the alloy steel inside the smelting furnace. The smelting time of the smelting furnace is 6 minutes. The alloy steel solution after impurities are removed and the proportion of carbon, silicon, manganese, phosphorus, sulfur, chromium, vanadium and molybdenum are placed inside the electric arc furnace. The temperature inside the electric arc furnace is 2680℃, and the heating time is 2 hours. After heating, it becomes mold steel liquid. Subsequently, oxygen is sprayed into the steel liquid to carry out redox reaction to remove impurities and gases in the steel liquid, and the steel liquid is sucked into the vacuum chamber of the vacuum furnace. Then, argon is blown into the molten steel. Under high temperature and vacuum conditions, the argon expands, causing the density of the molten steel and gas mixture to decrease, and then enters the vacuum chamber under the action of pressure difference. Under the action of high vacuum, the gas in the molten steel is released, and the molten steel is sprayed into fine droplets, further increasing the degassing effect. The molten steel is cast under vacuum conditions to reduce the content of gas and inclusions, and then poured into the mold. During the pouring process, the molds are horizontally fitted together and manually pushed. The molds are pushed to the pouring port of the mold steel liquid to assist the mold steel liquid to pour quickly, and spray water cooling is used. The wastewater generated after spraying is filtered and cooled again and can be recycled. After cooling, the mold steel workpiece is obtained. After cooling, the mold steel workpiece is placed in a quenching furnace with an internal temperature of 560°C. The mold steel workpiece is kept warm for 34 minutes for preheating. Then the internal temperature of the quenching furnace is raised to 1050°C and kept warm for 45 minutes. The mold steel workpiece is then taken out and cooled. The cooling time is 33 minutes. After cooling, the mold steel workpiece is placed in a tempering furnace with an internal temperature of 650°C. The tempering time is 56 minutes, and the number of times is 2. After tempering, the mold steel workpiece is cooled to complete the production.

[0057] Example 6:

[0058] The invention adopts alloy steel with 0.38% C, 0.40% Si, 0.41% Mn, 0.1% P, 0.11% S, 12.2% Cr, 0.76% V, 0.95% Mo and the balance. First, the alloy steel is placed inside the melting furnace. A pipe 1 is passed through one side of the melting furnace. The pipe 1 is equipped with a gate valve 2. The gate valve 2 is driven horizontally by the rotation of the transmission rod manually and the hydraulic telescopic rod. When the gate valve 2 moves horizontally, the gate valve 2 drives the rotating shaft 3 to slide synchronously. The rotating shaft 3 drives the sliding frame 5 to slide on the inner wall of the track of the pipe 1 through the cross arm 4. Through the sliding of the cross arm 4, it can It can drive the rotary bearing 6 to slide and rotate as a whole, and the outer blades 7 of the rotary bearing 6 rotate synchronously. Therefore, the horizontal operation of the gate valve 2 is used to remove impurities in the alloy steel inside the smelting furnace. The smelting time of the smelting furnace is 8 minutes. The alloy steel solution after impurities are removed and the proportion of carbon, silicon, manganese, phosphorus, sulfur, chromium, vanadium and molybdenum are placed inside the electric arc furnace. The internal temperature of the electric arc furnace is 2750℃, and the heating time is 2 hours. After heating, it becomes mold steel liquid. Subsequently, oxygen is sprayed into the steel liquid to carry out redox reaction to remove impurities and gases in the steel liquid. The steel liquid is then sucked into the vacuum chamber of the vacuum furnace. Then, argon is blown into the molten steel. Under high temperature and vacuum conditions, the argon expands, causing the density of the molten steel and gas mixture to decrease, and then enters the vacuum chamber under the action of pressure difference. Under the action of high vacuum, the gas in the molten steel is released, and the molten steel is sprayed into fine droplets, further increasing the degassing effect. The molten steel is cast under vacuum conditions to reduce the content of gas and inclusions, and then poured into the mold. During the pouring process, the molds are horizontally fitted together and manually pushed. The molds are pushed to the pouring port of the mold steel liquid to assist the mold steel liquid to pour quickly, and spray water cooling is used. The wastewater generated after spraying is filtered and cooled again, and can be recycled and reused. After cooling, the mold steel workpiece is obtained. After cooling, the mold steel workpiece is placed in a quenching furnace with an internal temperature of 580°C. The mold steel workpiece is kept warm for 36 minutes for preheating, and then the internal temperature of the quenching furnace is raised to 1100°C and kept warm for 55 minutes. The mold steel workpiece is then taken out and cooled for 37 minutes. After cooling, the mold steel workpiece is placed in a tempering furnace with an internal temperature of 680°C and a tempering time of 58 minutes, which is 2 times. After tempering, the mold steel workpiece is cooled to complete the production.

[0059] Embodiment seven:

[0060] The alloy steel is made of 0.42% C, 0.50% Si, 0.50% Mn, 0.20% P, 0.20% S, 13% Cr, 0.90% V, 1.20% Mo, and the remainder. First, the alloy steel is placed inside the melting furnace. A pipe 1 is passed through one side of the melting furnace. The pipe 1 is equipped with a gate valve 2. The gate valve 2 is driven horizontally by the manual rotation of the transmission rod and the hydraulic telescopic rod. When the gate valve 2 moves horizontally, the gate valve 2 drives the rotating shaft 3 to slide synchronously. The rotating shaft 3 drives the sliding frame 5 to slide on the inner wall of the track of the pipe 1 through the cross arm 4. Through the sliding of the cross arm 4, it can The rotary bearing 6 is driven to slide and rotate as a whole, and the outer blades 7 of the rotary bearing 6 rotate synchronously. Therefore, the horizontal operation of the gate valve 2 is used to remove impurities in the alloy steel inside the smelting furnace. The smelting time of the smelting furnace is 10 minutes. The alloy steel solution after impurities are removed and the proportion of carbon, silicon, manganese, phosphorus, sulfur, chromium, vanadium and molybdenum are placed inside the electric arc furnace. The temperature inside the electric arc furnace is 2950℃, and the heating time is 3 hours. After heating, it becomes mold steel liquid. Subsequently, oxygen is sprayed into the steel liquid to carry out redox reaction to remove impurities and gases in the steel liquid. The steel liquid is then sucked into the vacuum chamber of the vacuum furnace. Then, argon is blown into the molten steel. Under high temperature and vacuum conditions, the argon expands, causing the density of the molten steel and gas mixture to decrease, and then enters the vacuum chamber under the action of pressure difference. Under the action of high vacuum, the gas in the molten steel is released, and the molten steel is sprayed into fine droplets, further increasing the degassing effect. The molten steel is cast under vacuum conditions to reduce the content of gas and inclusions, and then poured into the mold. During the pouring process, the molds are horizontally fitted together and manually pushed. The molds are pushed to the pouring port of the mold steel liquid to assist the mold steel liquid to pour quickly, and spray water cooling is used. The wastewater generated after spraying is filtered and cooled again, and can be recycled and reused. After cooling, the mold steel workpiece is obtained. After cooling, the mold steel workpiece is placed in a quenching furnace with an internal temperature of 650°C. The mold steel workpiece is kept warm for 40 minutes for preheating, and then the internal temperature of the quenching furnace is raised to 1200°C and kept warm for 60 minutes. The mold steel workpiece is then taken out and cooled for 40 minutes. After cooling, the mold steel workpiece is placed in a tempering furnace with an internal temperature of 700°C and a tempering time of 60 minutes, three times. After tempering, the mold steel workpiece is cooled to complete the production.

[0061] Embodiment 8:

[0062] The H14 die steel produced with different values in Examples 4-7 was evaluated based on hardness and impact resistance;

[0063] Table 1: H14 mold steel evaluation table

[0064] Group Hardness (HRC) Impact resistance Comprehensive score Example 4 40 generally 75 Example 5 47 better 80 Example 6 51 Good performance 97 Example 7 48 better 91

[0065] By using 0.38% C, 0.40% Si, 0.41% Mn, 0.1% P, 0.11% S, 12.2% Cr, 0.76% V, 0.95% Mo, and the remainder as alloy steel as the raw material, and then evaluating the H14 mold steel processed with different values, it can be found that the hardness of the H14 mold steel processed in Example 6 can reach 51 and has good impact resistance. The overall score of the H14 mold steel processed in Example 6 can reach 97 points.

[0066] 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 new H14 die steel manufacturing process and application method, characterized by: The novel H14 die steel manufacturing process and application method thereof include the following steps: S1 raw material ratio: 0.32%-0.42% C, 0.30%-0.50% Si, 0.30%-0.50% Mn, 0%-0.20% P, 0%-0.20% S, 11%-13% Cr, 0.60-0.90% V, 0.70%-1.20% Mo, and the balance is alloy steel; S2 impurity smelting: alloy steel is placed inside a smelting furnace, a pipe (1) is passed through one side of the smelting furnace, the pipe (1) is equipped with a gate valve (2), and the gate valve (2) is driven horizontally by the manual rotation of the transmission rod and the hydraulic telescopic rod; S3 mixed smelting: When the gate valve (2) moves horizontally, the gate valve (2) drives the rotating shaft (3) to slide synchronously, and the rotating shaft (3) drives the sliding frame (5) to slide on the inner wall of the track of the pipeline (1) through the cross arm (4). Through the sliding of the cross arm (4), the rotating bearing (6) can be driven to slide and rotate as a whole, and the outer blades (7) of the rotating bearing (6) rotate synchronously. Therefore, the horizontal operation of the gate valve (2) is used to remove impurities in the alloy steel inside the smelting furnace, and the smelting time of the smelting furnace is 5-10 minutes; S4 proportioning smelting: the alloy steel solution after impurities are removed in step (3) and the carbon, silicon, manganese, phosphorus, sulfur, chromium, vanadium and molybdenum proportioned in step (1) are placed inside an electric arc furnace. The temperature inside the electric arc furnace is 2560-2950°C, and the heating time is 1-3 hours. After heating, the mold steel liquid is obtained. Subsequently, oxygen is sprayed into the steel liquid to perform an oxidation-reduction reaction to remove impurities and gases in the steel liquid. S5 vacuum degassing: The molten steel is sucked into the vacuum chamber of the vacuum furnace, and then argon is blown into the molten steel. Under high temperature and vacuum conditions, the argon expands, causing the density of the molten steel and gas mixture to decrease, so that it enters the vacuum chamber under the action of pressure difference. Under the action of high vacuum, the gas in the molten steel is released, and the molten steel is sprayed into fine droplets, further enhancing the degassing effect; S6 Forging: The molten steel in step (5) is cast under vacuum conditions to reduce the content of gas and inclusions, and then poured into the mold. During the pouring process, the molds are horizontally fitted together and manually pushed to the pouring port of the mold steel liquid to assist the mold steel liquid to pour quickly; S7 cooling: Spraying water is used for cooling. The wastewater generated after spraying is filtered and cooled again, and can be recycled. After cooling, the mold steel workpiece is obtained; S8 quenching: After cooling, the mold steel workpiece is placed in the quenching furnace. The internal temperature of the quenching furnace is 500-700℃. The mold steel workpiece is kept warm for 30-40 minutes for preheating. Then the internal temperature of the quenching furnace is raised to 1000-1200℃ and kept warm for 40-60 minutes. Then the mold steel workpiece is taken out and cooled. The cooling time is 30-40 minutes. S9 tempering: After cooling, the mold steel workpiece is placed in the tempering furnace. The internal temperature of the tempering furnace is 600-700℃, the tempering time is 50-60min, and the number of times is 2-3 times. After tempering, the mold steel workpiece is cooled to complete the production; S10 Application: The shape of the mold used for pouring the molten steel in step (3) is selected according to the desired application direction of the mold steel. The prepared mold steel workpiece can be applied to plastic molds, stamping molds and cutting tools.

2. The novel H14 die steel manufacturing process and application method according to claim 1 are characterized by: The pipeline (1) is a pipeline at the outlet of the smelting furnace.

3. The novel H14 die steel manufacturing process and application method according to claim 1 are characterized by: A track is provided on the inner side of the pipeline (1), one end of the sliding frame (5) slides inside the track, the other end of the sliding frame (5) is connected to the cross arm (4), one side of the gate valve (2) is rotatably connected to the rotating shaft (3), the rotating shaft (3) is rotatably connected to the cross arm (4), a rotary bearing (6) is rotatably connected to one end of the cross arm (4) away from the gate valve (2), a blade (7) surrounds the outer side of the rotary bearing (6), and the rotary bearing (6) passes through the interior of the smelting furnace.

4. The novel H14 die steel manufacturing process and application method according to claim 1 are characterized by: The molds used for pouring the mold steel liquid are arranged on the upper end of the pulley block. By pushing the molds, the molds move horizontally on the upper end of the pulley block. The diameter of the pulley block is 1-3 cm.

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