High-strength and anti-fatigue mold jig alloy material and preparation method thereof

Abstract

The invention discloses a high-strength and anti-fatigue mold jig alloy material and a preparation method thereof, and relates to the technical field of mold jig materials, the high-strength and anti-fatigue mold jig alloy material is prepared from the following components by mass: 0.3-1.0 wt% of carbon (C), 4-8 wt% of chromium (Cr), and 1-3 wt% of molybdenum (Mo). According to the high-strength and anti-fatigue mold jig alloy material and the preparation method thereof, the formula of an existing mold jig alloy material is optimized, the wear resistance, corrosion resistance and fatigue resistance of the mold jig alloy material are effectively improved by adding chromium and molybdenum materials, meanwhile, the thermal stability of the alloy material is also improved, and the service life of the alloy material is prolonged. Vanadium is added to facilitate formation of fine carbides, grain refinement and particle strengthening effects are achieved, and the overall performance and heat treatment reactivity of the alloy material can be effectively optimized by adding a proper amount of materials such as silicon, nickel and trace boron.

Description

Technical Field

[0001] The present invention relates to the technical field of die and fixture materials, and specifically to a high-strength and fatigue-resistant die and fixture alloy material and a preparation method thereof. Background Art

[0002] Dies and fixtures are very important tools in the manufacturing industry, which are mainly used to ensure the accuracy and consistency of parts. Since the quality of dies and fixtures will directly affect the accuracy and consistency of the final product, better alloy materials need to be used when manufacturing dies and fixtures. However, the current die and fixture alloy materials still have the following deficiencies:

[0003] However, since dies and fixtures are mostly used continuously and uninterruptedly during actual production operation by manufacturers, the die and fixture alloy materials are also gradually developing towards alloy materials with better strength. However, the existing die and fixture alloy materials still cannot adapt to continuous operation in some special working environments. Therefore, the research and development of alloy materials with higher strength and better fatigue resistance has become an important task at present.

[0004] Although with the continuous improvement of the existing technology, the strength and fatigue resistance of the existing die and fixture alloy materials have become better, when the dies and fixtures are used continuously and uninterruptedly for a long time, a large amount of wear still inevitably occurs, which has a certain interference on the service life of the dies and fixtures. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-strength and fatigue-resistant die and fixture alloy material and a preparation method thereof to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] In the first aspect, the present invention provides a high-strength and fatigue-resistant die and fixture alloy material, which is made of the following components by mass percentage: base metal, carbon (C) 0.3-1.0 wt%, chromium (Cr) 4-8 wt%, molybdenum (Mo) 1-3 wt%, vanadium (V) 0.1-0.5 wt%, silicon (Si) 0.05-0.15 wt%, nickel (Ni) 0.05-0.15 wt%, boron (B) 0.01-0.03 wt%, alloying additive;

[0008] The base metal is a common alloy material base metal such as iron (Fe) or aluminum (Al);

[0009] The alloying additive is selected from one or more of iron agents, manganese agents, nickel agents or composite refining agents containing components such as chloride salts, fluoride salts, rare earths, etc.

[0010] Furthermore, high-purity materials are selected for the base metal, carbon, chromium, molybdenum, vanadium, nickel, silicon, and boron, and the content of impurities (such as oxygen, sulfur, and phosphorus) in the materials is strictly controlled.

[0011] In a second aspect, the present invention provides a method for preparing a high-strength and fatigue-resistant die and fixture alloy material, which is applied to the high-strength and fatigue-resistant die and fixture alloy material described above. The preparation method includes the following steps:

[0012] S1. Raw material screening: According to the formula requirements of the die and fixture alloy material, high-purity metallurgical materials are selected and the content of impurities in the raw materials is strictly controlled to ensure more efficient and complete removal of impurities during subsequent smelting.

[0013] S2. Batching and proportion calculation: According to the formula requirements of the die and fixture alloy material, the dosage of each raw material is accurately calculated and precise batching is carried out to ensure the accurate proportion of each raw material. After batching is completed, the batching data is recorded.

[0014] S3. Melting and alloying: Inject the base metal into the furnace for dissolution, then start the stirring equipment to stir the metal solution in the furnace, and add the accurately proportioned other materials into the furnace in due course during the stirring process to make all raw materials fully mixed. During the stirring process, regularly check the working state of the stirring equipment to ensure the mixing effect.

[0015] S4. Casting processing: Adopt high-precision die casting technology and cooperate with low-pressure or high-pressure casting to reduce casting defects, and perform precision machining after casting to eliminate surface defects.

[0016] S5. Heat treatment process:

[0017] S51. Solution treatment: Heat the formed part to a suitable high temperature (within the range of 900 - 1100 °C) and maintain for a sufficient time to make all strengthening elements fully dissolve into the matrix to form a single-phase solid solution.

[0018] S52. High-speed cooling (quenching): Use oil quenching, water quenching, or gas quenching means to rapidly cool the solid solution to prevent the formation of coarse precipitation phases.

[0019] S53. Tempering treatment: Perform aging treatment or tempering at a lower temperature to promote the precipitation of fine and uniform precipitation phases in the matrix.

[0020] S6. Surface strengthening treatment: Adopt laser quenching to rapidly heat and rapidly cool a part of the die and fixture locally to form a hardened layer.

[0021] S7. Quality inspection: Conduct tensile tests, impact tests, hardness tests, and long-cycle low-cycle fatigue tests on the manufactured material to ensure that it meets the design requirements.

[0022] Furthermore, in step S3, vacuum induction melting or an electric arc furnace in a protective atmosphere (such as argon) environment is used for melting and processing to ensure that the oxygen content in the molten metal is extremely low, which is beneficial to the uniform dissolution of alloy elements.

[0023] Furthermore, in step S51, a trolley furnace is used for solution treatment, and the trolley furnace needs to operate within the range of 900 - 1100 °C. During the solution treatment process, the heating temperature and heating duration must be controlled to avoid interference with the material strength and fatigue resistance caused by temperature difference and duration.

[0024] Furthermore, in step S51, when the trolley furnace is performing solution treatment, inert gases such as nitrogen and argon are injected into the furnace for atmosphere protection to ensure that the oxygen content in the furnace is extremely low and prevent the material from oxidizing.

[0025] Furthermore, in step S6, before laser quenching, the surface of the workpiece is phosphated or coated with an absorbent coating (such as graphite powder + acrylic resin) to ensure efficient energy transfer to the interior of the material.

[0026] Furthermore, in step S7, the detection of the die and fixture alloy material specifically includes:

[0027] Tensile test: The tensile resistance of the die and fixture alloy material directly affects the service strength of the die and fixture. Therefore, a tensile testing device is used to detect the strength of the alloy material to ensure that the alloy material can adapt to high-strength operation during actual use.

[0028] Impact test: An impact hammer is used to detect the impact resistance of the alloy material to ensure that the strength of the fabricated alloy material meets the service strength standard and avoid fracture of the die and fixture alloy material when it is impacted during use.

[0029] Long-term low-cycle fatigue test: A fatigue testing machine is used to detect the performance of the alloy material to detect whether the fabricated alloy material can be used normally during long-term continuous operation.

[0030] The present invention provides a high-strength and fatigue-resistant die and fixture alloy material and its preparation method, which has the following beneficial effects:

[0031] The present invention optimizes the existing alloy material formula for mold fixtures. By adding chromium and molybdenum materials, the wear resistance, corrosion resistance, and fatigue resistance of the alloy material for mold fixtures are effectively improved. At the same time, the thermal stability of the alloy material is also improved. The addition of vanadium helps to form fine carbides, playing a role in grain refinement and particle strengthening. In addition, the addition of appropriate amounts of silicon, nickel, and trace boron and other materials can effectively optimize the overall performance and heat treatment reactivity of the alloy material, thus greatly improving the strength and fatigue resistance of the alloy material for mold fixtures. Furthermore, during the preparation process of the alloy material, laser quenching is used to strengthen the surface of the alloy material, forming a hardened layer on the surface of the alloy material, thereby further improving the wear resistance and fatigue resistance of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the operation process of the preparation method of a high-strength and fatigue-resistant alloy material for mold fixtures of the present invention;

[0033] Figure 2 It is a schematic diagram of the operation process of the heat treatment process in the preparation method of a high-strength and fatigue-resistant alloy material for mold fixtures of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0034] The following further describes in detail the embodiments of the present invention in conjunction with the drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0035] A high-strength and fatigue-resistant alloy material for mold fixtures is made of the following components by mass percentage: base metal, carbon (C) 0.3 - 1.0 wt%, chromium (Cr) 4 - 8 wt%, molybdenum (Mo) 1 - 3 wt%, vanadium (V) 0.1 - 0.5 wt%, silicon (Si) 0.05 - 0.15 wt%, nickel (Ni) 0.05 - 0.15 wt%, boron (B) 0.01 - 0.03 wt%, alloying additives;

[0036] The base metal is a common alloy material base metal such as iron (Fe) or aluminum (Al);

[0037] The alloying additives are selected from one or more of iron agents, manganese agents, nickel agents, or composite refining agents containing components such as chlorine salts, fluorine salts, and rare earths;

[0038] The base metal, carbon, chromium, molybdenum, vanadium, nickel, silicon, and boron are all selected as high-purity materials, and the content of impurities (such as oxygen, sulfur, and phosphorus) in the materials is strictly controlled.

[0039] A preparation method of a high-strength and fatigue-resistant alloy material for mold fixtures is applied to the above high-strength and fatigue-resistant alloy material for mold fixtures. The preparation method includes the following steps:

[0040] S1. Raw material screening: According to the requirements of the alloy material formula for the mold fixture, high-purity metallurgical materials are selected and the content of impurities in the raw materials is strictly controlled to ensure more efficient and perfect removal of impurities during subsequent smelting.

[0041] S2. Batching and proportion calculation: According to the requirements of the alloy material formula for the mold fixture, accurately calculate the dosage of each raw material and conduct precise batching to ensure the accurate proportion of each raw material. After batching is completed, record the batching data.

[0042] S3. Melting and alloying: Inject the base metal into the furnace for dissolution, then start the stirring equipment to stir the metal solution in the furnace, and add the accurately proportioned other materials into the furnace in a timely manner during the stirring process to make all raw materials fully mixed. During the stirring process, regularly check the working status of the stirring equipment to ensure the mixing effect. Use vacuum induction melting or an electric arc furnace in a protective atmosphere (such as argon) environment for melting processing to ensure that the oxygen content in the metal melt is extremely low, which is beneficial to the uniform dissolution of alloying elements.

[0043] S4. Casting processing: Adopt the low-pressure casting process to pour the melted alloy liquid into a high-precision die-casting mold. The die-casting mold is preheated to 200 °C to reduce the thermal stress during the casting process. After casting is completed, conduct precision machining on the casting, and process the surface through a CNC lathe and milling machine to remove a 0.5-mm allowance and eliminate possible defects such as pores and sand holes on the surface layer.

[0044] S5. Heat treatment process:

[0045] S51. Solution treatment: Put the processed formed part into a trolley furnace, heat it to 1000 °C at a heating rate of 10 °C / min, and hold it at this temperature for 3 hours to make all strengthening elements fully dissolve into the matrix to form a single-phase solid solution. During the operation of the trolley furnace, accurately control the furnace temperature through the temperature control system, and control the fluctuation range within ±5 °C. At the same time, continuously inject argon into the furnace to keep the oxygen content in the furnace below 0.01% to prevent material oxidation.

[0046] S52. High-speed cooling (quenching): Quench the solid solution rapidly by oil quenching. Special quenching oil is selected for the quenching oil, and the oil temperature is controlled at 40 °C to ensure that the cooling rate is within a suitable range, prevent the formation of coarse precipitation phases, and improve the strength and hardness of the material.

[0047] S53. Tempering treatment: Put the quenched workpiece into a tempering furnace and conduct tempering treatment at 550 °C for 2 hours. During tempering, promote the precipitation of fine and uniform precipitation phases in the matrix, effectively improving the toughness and fatigue resistance of the material.

[0048] S6. Surface strengthening treatment: Phosphatize the surface of the mold fixture to form a uniform phosphate coating with a thickness of about 5 μm. Then, adopt laser quenching technology with a laser power of 3000 W, a scanning speed of 10 mm / s, and a spot diameter of 3 mm to rapidly heat and cool the mold fixture locally, forming a hardened layer with a thickness of about 0.5 mm on the surface, significantly improving the surface hardness and wear resistance;

[0049] S7. Quality inspection: Conduct tensile tests, impact tests, hardness tests, and long-term low-cycle fatigue tests on the fabricated materials to ensure they meet the design requirements. The specific inspection of the alloy materials for the mold fixture includes:

[0050] Tensile test: The tensile resistance of the alloy material of the mold fixture directly affects the service strength of the mold fixture. Use tensile testing equipment to measure the strength of the alloy material to ensure that the alloy material can adapt to high-intensity operation during actual use;

[0051] Impact test: Use an impact hammer to test the impact resistance of the alloy material to ensure that the strength of the fabricated alloy material meets the service strength standard and prevent the alloy material of the mold fixture from cracking when subjected to impact during use;

[0052] Long-term low-cycle fatigue test: Use a fatigue testing machine to test the performance of the alloy material to detect whether the fabricated alloy material can be used normally during long-term continuous operation.

[0053] The embodiments of the present invention are given for purposes of illustration and description, and are not exhaustive or limit the invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and enable those of ordinary skill in the art to understand the present invention and design various embodiments with various modifications suitable for specific purposes.

Claims

1. A high-strength and fatigue-resistant die and fixture alloy material, characterized in that, It is made of the following components by mass percentage: base metal, carbon (C) 0.3 - 1.0 wt%, chromium (Cr) 4 - 8 wt%, molybdenum (Mo) 1 - 3 wt%, vanadium (V) 0.1 - 0.5 wt%, silicon (Si) 0.05 - 0.15 wt%, nickel (Ni) 0.05 - 0.15 wt%, boron (B) 0.01 - 0.03 wt%, alloying additives; The base metal is a common alloy material base metal such as iron (Fe) or aluminum (Al); The alloying additives are selected from one or more of iron agents, manganese agents, nickel agents or composite refining agents containing components such as chloride salts, fluoride salts, and rare earths.

2. The high-strength and fatigue-resistant die tool alloy material according to claim 1, wherein The base metal, carbon, chromium, molybdenum, vanadium, nickel, silicon, and boron are all made of high-purity materials, and the content of impurities in the materials is strictly controlled.

3. A preparation method of a high-strength and fatigue-resistant die fixture alloy material, which is applied to the high-strength and fatigue-resistant die fixture alloy material described in any one of claims 1-2, and is characterized in that, The preparation method includes the following steps: S1. Raw material screening: According to the requirements of the alloy material formula for the mold fixture, high-purity metallurgical materials are selected and the content of impurities in the raw materials is strictly controlled to ensure more efficient and perfect removal of impurities during subsequent smelting; S2. Batching and proportion calculation: According to the requirements of the alloy material formula for the mold fixture, the dosage of each raw material is accurately calculated, and precise batching is carried out to ensure the accurate proportion of each raw material. After batching is completed, the batching data is recorded; S3. Melting and alloying: Inject the base metal into the furnace for dissolution, then start the stirring equipment to stir the metal solution in the furnace, and add the accurately proportioned other materials into the furnace in a timely manner during the stirring process to make all raw materials fully mixed. During the stirring process, regularly check the working status of the stirring equipment to ensure the mixing effect; S4. Casting processing: Adopt high-precision mold casting technology and cooperate with low-pressure or high-pressure casting to reduce casting defects, and perform precision machining after casting to eliminate surface defects; S5. Heat treatment process: S51. Solution treatment: Heat the formed part to a suitable high temperature and maintain it for a sufficient time to fully dissolve each strengthening element into the matrix to form a single-phase solid solution; S52. High-speed cooling: Use oil quenching, water quenching or gas quenching means to rapidly cool the solid solution to prevent the formation of coarse precipitated phases; S53. Tempering treatment: Perform aging treatment or tempering at a lower temperature to promote the precipitation of fine and uniform precipitated phases in the matrix; S6. Surface strengthening treatment: Adopt laser quenching to locally and rapidly heat and rapidly cool the mold fixture to form a hardened layer; S7. Quality inspection: Conduct tensile tests, impact tests, hardness tests and long-term low-cycle fatigue tests on the manufactured materials to ensure meeting the design requirements.

4. The preparation method of a high-strength and fatigue-resistant die and fixture alloy material according to claim 3, characterized in that, In step S3, vacuum induction melting or an electric arc furnace in a protective atmosphere environment is used for melting and processing to ensure that the oxygen content in the metal melt is extremely low, which is beneficial to the uniform dissolution of alloying elements.

5. The preparation method of a high-strength and fatigue-resistant die and fixture alloy material according to claim 3, characterized in that, In step S51, a trolley furnace is used for solution processing, and the trolley furnace must operate within the range of 900 - 1100 °C during operation. During the solution processing, the heating temperature and heating duration must be controlled to avoid interference of temperature difference and duration on the material strength and fatigue resistance.

6. The preparation method of a high-strength and fatigue-resistant die fixture alloy material according to claim 5, characterized in that, In the step S51, when the trolley furnace performs solution treatment, inert gases such as nitrogen and argon need to be injected into the furnace for atmosphere protection to ensure that the oxygen content in the furnace is extremely low and prevent the material from oxidation.

7. The preparation method of a high-strength and fatigue-resistant mold fixture alloy material according to claim 3, characterized in that, In the step S6, before laser quenching, the surface of the workpiece is phosphated or coated with an absorptive coating to ensure efficient energy transfer to the interior of the material.

8. The preparation method of a high-strength and fatigue-resistant die fixture alloy material according to claim 3, characterized in that, In the step S7, the detection of the alloy material of the mold fixture specifically includes: Tensile test: The tensile resistance of the alloy material of the mold fixture directly affects the use strength of the mold fixture. The tensile testing equipment is used to detect the strength of the alloy material to ensure that the alloy material can adapt to high-intensity operation during actual use. Impact test: An impact hammer is used to detect the impact resistance of the alloy material to ensure that the strength of the manufactured alloy material meets the use strength standard and avoid fracture of the alloy material of the mold fixture when it is impacted during use. Long-term low-cycle fatigue test: A fatigue testing machine is used to detect the performance of the alloy material to detect whether the manufactured alloy material can be used normally during long-term continuous operation.

Images