A production process for high-performance hard aluminum alloy sheet and strip

Abstract

The present invention provides a production process for high-performance hard aluminum alloy plates and strips, which relates to the technical field of aluminum alloy plate and strip production and processing. In this production process for high-performance hard aluminum alloy plates and strips, the mass percentages of the aluminum alloy components are set as follows: Si: 7.5 - 8%, Mg: 0.1 - 0.3%, Mn: 0.3 - 0.5%, Ti: 0.1 - 0.2%, Ni: 0.35 - 0.55%, C: 0.45 - 0.65%, Fe: 0.2 - 0.3%, Sr ≤ 0.04%, Cu ≤ 0.06%, and the rest is Al. It includes the following specific preparation and production processes: S1. Raw material preparation; S2. Aluminum alloy melting; S3. Aluminum liquid casting; S4. Rolling and forming; S5. Quenching, cooling and discharging. By adding Ni to the raw materials for the preparation of traditional aluminum alloys, the mechanical properties of the aluminum alloy can be effectively improved, the hardness of the aluminum alloy plate can be increased while the service life of the overall plate is extended. Also, when performing the quenching treatment on the aluminum alloy plate and strip, real-time stretching treatment is carried out on the quenched plate, which can effectively improve the quenching efficiency of the plate core while effectively solving the deformation problem of the aluminum alloy plate and strip during quenching.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloy sheet and strip production and processing, and specifically relates to a production process for high-performance hard aluminum alloy sheet and strip. Background Art

[0002] Aluminum and its alloys are a kind of metal material with the characteristics of high specific strength, good corrosion resistance, good processing performance and excellent welding performance. They are often used in the fields of transportation, aerospace, chemical engineering and medical devices. Aluminum and its alloys can also be applied in various shapes. Among them, sheet and strip is a relatively common application form of aluminum alloy, generally referring to an aluminum plate with a certain length and an extremely small thickness.

[0003] When traditional aluminum alloy sheet and strip is produced, it generally needs to go through three steps of melting, casting and quenching in sequence. And when traditional aluminum alloy sheet and strip is produced, generally only solid aluminum, silicon ingot, element Mg, and element Mn are used as its basic raw materials. The performance of the produced aluminum alloy sheet and strip is often insufficient, and the hard structure is insufficient, so it often cannot be used in the production of more precise instruments. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present invention provides a production process for high-performance hard aluminum alloy sheet and strip, which solves the problems that the mechanical properties of the existing aluminum alloy sheet and strip are not strong, the strength, hardness and ductility are relatively low, and the service life of the overall sheet is not high, and it is prone to heat deformation during quenching production.

[0006] (2) Technical Solutions

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: A production process for high-performance hard aluminum alloy sheet and strip, the mass percentages of the aluminum alloy components of the aluminum alloy sheet and strip are set as follows: Si: 7.5 - 8%, Mg: 0.1 - 0.3%, Mn: 0.3 - 0.5%, Ti: 0.1 - 0.2%, Ni: 0.35 - 0.55%, C: 0.45 - 0.65%, Fe: 0.2 - 0.3%, Sr ≤ 0.04%, Cu ≤ 0.06%, and the rest is Al.

[0008] Preferably, the preparation production process of the aluminum alloy sheet and strip includes the following steps:

[0009] S1. Raw material preparation: Prepare the basic raw materials in set proportion: solid aluminum, silicon ingot, element Mg, element Mn; element Ti and element Ni;

[0010] S2. Aluminum alloy melting: Divide the prepared raw materials into three parts, add them into the tilting furnace, and conduct continuous stirring and melting treatment. During the melting process, use a slag remover to remove slag inside;

[0011] S3. Aluminum liquid casting: After skimming the surface scum from the melted aluminum liquid, conduct spectral quality analysis on it. For the alloy aluminum liquid with qualified components, conduct casting treatment in the strip and plate mold;

[0012] S4. Rolling and forming: Conduct cooling treatment on the aluminum alloy sheet after casting in the mold. After cooling and taking out of the mold, put the aluminum alloy sheet into the rolling mill for strip forming treatment;

[0013] S5. Quenching, cooling and discharging: Put the formed aluminum alloy strip under the condition of strip stretching into the quenching furnace, add carbon powder in a set proportion for quenching treatment. Then conduct water immersion cooling treatment on the quenched aluminum alloy strip, and finally put it into the quenching furnace again for low-temperature tempering treatment to obtain the target hard aluminum alloy strip and plate.

[0014] Preferably, the specific operation steps of the melting in step S2 include:

[0015] a1. Divide the solid aluminum, silicon ingots, element Mg, element Mn, element Ti and element Ni in corresponding proportions into two equal parts. Add the first part of the raw materials into the tilting furnace in sequence for melting treatment;

[0016] a2. Wait until the aluminum liquid in the tilting furnace after melting treatment has skimmed the surface scum, then add the second part of the raw materials into the aluminum liquid for mixing, and let the aluminum liquid conduct melting treatment in the tilting furnace again;

[0017] a3. Pass the melted aluminum liquid through the cold slag machine and the slag remover in sequence for chip and slag recovery. Add the set proportion of element Fe and element Sr into the remaining aluminum liquid for the third melting treatment.

[0018] Preferably, the melting temperature in the tilting furnace in step S2 is set at 750°C - 760°C.

[0019] Preferably, the temperature when the aluminum alloy sheet conducts strip forming treatment in step S4 is set at 500°C.

[0020] Preferably, the quenching time inside the quenching furnace in step S5 is set at 5h, and the quenching temperature is set at 600°C.

[0021] Preferably, the tempering time of the aluminum alloy inside the quenching furnace in step S5 is set at 10h, and the tempering temperature is set at 180°C.

[0022] Preferably, the melting temperatures for the melting treatment in the tilting furnace in steps a2 and a3 are both set to 2h.

[0023] (III) Beneficial Effects

[0024] The present invention provides a production process for high-performance hard aluminum alloy plates and strips. It has the following beneficial effects:

[0025] 1. By adding Ni to the raw materials for preparing traditional aluminum alloys, the present invention can effectively improve the mechanical properties of aluminum alloys, thereby improving the strength and ductility of aluminum alloys, prolonging the service life of the overall plates while increasing the hardness of aluminum alloy plates, and adding a certain amount of carbon powder during the quenching treatment, which can improve the surface hardness of the aluminum alloy plates after quenching.

[0026] 2. By performing real-time stretching on the quenched plates during the quenching treatment of aluminum alloy plates and strips, since the temperature gradient in the thickness direction of the aluminum alloy thin plates is extremely small and the core deformation during quenching is limited, the quenching efficiency of the plate core can be improved when stretching the thin plates. At the same time, when the aluminum alloy half-bag is in a stretched state, the residual stress on the surface of the thin plate is in a tensile stress state. At this time, when quenching, the mechanical properties of the aluminum alloy plates and strips after quenching can be improved, effectively solving the deformation problem of aluminum alloy plates and strips during quenching. Specific Embodiments

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Example 1:

[0029] The embodiment of the present invention provides a production process for high-performance hard aluminum alloy plates and strips. The mass percentages of the aluminum alloy components of the aluminum alloy plates and strips are set as follows: Si: 7.5%, Mg: 0.1%, Mn: 0.3%, Ti: 0.1%, Ni: 0.35%, C: 0.45%, Fe: 0.2%, Sr: 0.02%, Cu: 0.03%, and the rest is Al. By adding Ni to the raw materials for preparing traditional aluminum alloys, the mechanical properties of aluminum alloys can be effectively improved, thereby improving the strength and ductility of aluminum alloys, prolonging the service life of the overall plates while increasing the hardness of aluminum alloy plates.

[0030] The production process for the aluminum alloy plates and strips includes the following steps:

[0031] S1. Raw material preparation: Prepare the basic raw materials in set proportion: solid aluminum, silicon ingot, element Mg, element Mn, element Ti, and element Ni;

[0032] S2. Aluminum alloy melting: Divide the prepared raw materials into three parts, add them into the tilting furnace for continuous stirring and melting treatment, and use a slag remover to remove slag inside during the melting process;

[0033] S3. Aluminum liquid casting: After skimming the surface scum from the melted aluminum liquid, conduct spectral quality analysis on it. For the alloy aluminum liquid with qualified composition, conduct casting treatment in the strip and sheet die;

[0034] S4. Rolling and forming: Conduct temperature reduction and cooling treatment on the aluminum alloy sheet after casting in the die. After the aluminum alloy sheet is cooled and removed from the die, put it into a rolling mill for strip forming treatment;

[0035] S5. Quenching, cooling and discharging: Put the formed aluminum alloy strip under the condition of strip stretching into a quenching furnace and add carbon powder in set proportion for quenching treatment. Then conduct water immersion cooling treatment on the quenched aluminum alloy strip, and finally put it into the quenching furnace again for low-temperature tempering treatment to obtain the target hard aluminum alloy strip and sheet. Adding a certain amount of carbon powder during the quenching treatment can improve the surface hardness of the aluminum alloy sheet after quenching. At the same time, conduct real-time stretching treatment on the quenched aluminum alloy strip during the quenching treatment of the aluminum alloy strip and sheet. Since the temperature gradient in the thickness direction of the aluminum alloy thin sheet is extremely small and the core deformation is limited during quenching, the quenching efficiency of the core of the sheet can be improved when stretching the thin sheet. At the same time, when the aluminum alloy strip and sheet is in the stretching state, the residual stress on the surface of the thin sheet is in a tensile stress state. At this time, conducting quenching can improve the mechanical properties of the aluminum alloy strip and sheet after quenching, effectively solving the deformation problem of the aluminum alloy strip and sheet during quenching.

[0036] The specific operation steps of melting in step S2 include:

[0037] a1. Divide the solid aluminum, silicon ingot, element Mg, element Mn, element Ti, and element Ni in corresponding proportion into two equal parts according to the same weight. Add the first part of the raw materials into the tilting furnace in sequence for melting treatment;

[0038] a2. Wait until the aluminum liquid in the tilting furnace after melting treatment has its surface scum skimmed off, then add the second part of the raw materials into the aluminum liquid for mixing, and let the aluminum liquid conduct melting treatment in the tilting furnace again;

[0039] a3. Let the molten aluminum liquid in the boiler pass through a cold slag machine and a slag remover in sequence for chip and slag recovery, and add element Fe and element Sr in set proportion into the remaining aluminum liquid for the third melting treatment.

[0040] The melting temperature in the tilting furnace in step S2 is set at 750 °C.

[0041] In step S4, the temperature during the strip forming process of the aluminum alloy sheet is set at 500 °C.

[0042] In step S5, the quenching time inside the quenching furnace is set at 5 h, and the quenching temperature is set at 600 °C.

[0043] In step S5, the tempering time of the aluminum alloy inside the quenching furnace is set at 10 h, and the tempering temperature is set at 180 °C.

[0044] In steps a2 and a3, the melting temperature during the melting process in the tilting furnace is set at 2 h.

[0045] Example 2:

[0046] The present invention provides a production process for high-performance hard aluminum alloy sheet and strip. The mass percentages of the aluminum alloy components of the aluminum alloy sheet and strip are set as follows: Si: 8%, Mg: 0.3%, Mn: 0.5%, Ti: 0.2%, Ni: 0.55%, C: 0.65%, Fe: 0.3%, Sr: 0.04%, Cu: 0.06%, and the rest is Al.

[0047] The preparation process of the aluminum alloy sheet and strip includes the following steps:

[0048] S1. Raw material preparation: Prepare the basic raw materials in set proportion: solid aluminum, silicon ingots, element Mg, element Mn, element Ti, and element Ni. Adding Ni to the raw materials for preparing traditional aluminum alloys can effectively improve the mechanical properties of the aluminum alloy, thereby improving the strength and ductility of the aluminum alloy, increasing the hardness of the aluminum alloy sheet while extending the service life of the overall sheet.

[0049] S2. Aluminum alloy melting: Divide the prepared raw materials into three parts, add them to the tilting furnace for continuous stirring and melting treatment, and use a slag remover to remove slag inside during the melting process.

[0050] S3. Aluminum liquid casting: Skim the surface scum from the melted aluminum liquid inside, and then conduct spectral quality analysis on it. For the qualified alloy aluminum liquid, conduct casting treatment in the strip and sheet die.

[0051] S4. Rolling and forming: Cool the aluminum alloy sheet after casting in the die, and then put the cooled aluminum alloy sheet out of the die into a rolling mill for strip forming treatment.

[0052] S5. Quenching Cooling and Discharging: After the formed aluminum alloy strips are shaped, place them in a quenching furnace under the condition of strip stretching, add carbon powder in a set proportion for quenching treatment. Then, conduct water immersion cooling treatment on the quenched aluminum alloy strips. Finally, put them back into the quenching furnace for low-temperature tempering treatment to obtain the target hard aluminum alloy strip. Adding a certain amount of carbon powder during quenching can improve the surface hardness of the aluminum alloy sheet after quenching. At the same time, when conducting quenching treatment on the aluminum alloy strip, perform real-time stretching treatment on the quenched sheet. Since the temperature gradient in the thickness direction of the aluminum alloy thin sheet is extremely small and the core deformation is limited during quenching, stretching the thin sheet can improve the quenching efficiency of the sheet core. At the same time, when the aluminum alloy half-bag is in a stretched state, the residual stress on the surface of the thin sheet is in a tensile stress state. At this time, quenching can improve the mechanical properties of the aluminum alloy strip after quenching, effectively solving the deformation problem of the aluminum alloy strip during quenching.

[0053] The specific operation steps in S2 include:

[0054] a1. Divide the corresponding proportion of solid aluminum, silicon ingots, element Mg, element Mn, element Ti, and element Ni into two equal parts according to the same weight. Add the first portion of raw materials to the tilting furnace in sequence for melting treatment;

[0055] a2. After waiting for the molten aluminum in the tilting furnace to skim off the surface scum during melting treatment, add the second portion of raw materials to the molten aluminum for mixing, and then let the molten aluminum in the tilting furnace undergo melting treatment again;

[0056] a3. Pass the molten aluminum in the boiler through a slag cooler and a slag remover in sequence for slag and chip recovery. Add the set proportion of element Fe and element Sr to the remaining molten aluminum for the third melting treatment.

[0057] The melting temperature in the tilting furnace in S2 is set at 760 °C.

[0058] The temperature during the strip forming treatment of the aluminum alloy sheet in S4 is set at 500 °C.

[0059] The quenching time in the quenching furnace in S5 is set at 5 h, and the quenching temperature is set at 600 °C.

[0060] The tempering time of the aluminum alloy in the quenching furnace in S5 is set at 10 h, and the tempering temperature is set at 180 °C.

[0061] The melting temperature during melting treatment in the tilting furnace in both a2 and a3 is set at 2 h.

[0062] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A production process for high-performance hard aluminum alloy plates and strips, characterized in that: The mass percentages of the aluminum alloy components of the aluminum alloy sheet and strip are set as follows: Si: 7.5 - 8%, Mg: 0.1 - 0.3%, Mn: 0.3 - 0.5%, Ti: 0.1 - 0.2%, Ni: 0.35 - 0.55%, C: 0.45 - 0.65%, Fe: 0.2 - 0.3%, Sr ≤ 0.04%, Cu ≤ 0.06%, and the balance is Al; The preparation production process of the aluminum alloy sheet and strip includes the following steps: S1. Raw material preparation: Prepare the basic raw materials in set proportion: solid aluminum, silicon ingots, element Mg, element Mn, element Ti, and element Ni; S2. Aluminum alloy melting: Divide the prepared raw materials into three portions, add them to a tilting furnace for continuous stirring and melting treatment, and use a slag remover to remove slag inside during the melting process; S3. Aluminum liquid casting: After skimming the surface scum from the melted aluminum liquid, conduct spectral quality analysis on it. For the alloy aluminum liquid with qualified components, conduct casting in a sheet and strip mold; S4. Rolling and forming: Conduct temperature reduction and cooling treatment on the aluminum alloy sheet cast in the mold. After the aluminum alloy sheet is cooled and removed from the mold, put it into a rolling mill for strip forming treatment; S5. Quenching, cooling, and discharging: Put the aluminum alloy strip after strip forming into a quenching furnace under the condition of strip stretching, add carbon powder in set proportion for quenching treatment, then conduct water immersion cooling treatment on the quenched aluminum alloy strip, and finally put it into the quenching furnace again for low-temperature tempering treatment to obtain the target hard aluminum alloy sheet and strip; In the S4 step, the temperature during the strip forming treatment of the aluminum alloy sheet is set at 500°C; In the S5 step, the quenching time inside the quenching furnace is set at 5 h, and the quenching temperature is set at 600°C.

2. The production process of a high-performance hard aluminum alloy plate strip according to claim 1, characterized in that: The specific operation steps of the melting in the S2 step include: a1. Divide the solid aluminum, silicon ingots, element Mg, element Mn, element Ti, and element Ni in corresponding proportion into two equal portions according to the same quantity. Add the first portion of raw materials to the tilting furnace in sequence for melting treatment; a2. Wait until the aluminum liquid in the tilting furnace after melting treatment has its surface scum skimmed off, then add the second portion of raw materials to mix inside the aluminum liquid, and let the aluminum liquid conduct melting treatment in the tilting furnace again; a3. Pass the melted aluminum liquid in the boiler through a cold slag machine and a slag remover in sequence for chip and slag recovery, and add element Fe and element Sr in set proportion to the remaining aluminum liquid for the third melting treatment.

3. A production process of a high-performance hard aluminum alloy sheet and strip according to claim 1, characterized in that: In the S2 step, the melting temperature in the tilting furnace is set at 750°C - 760°C.

4. A production process of a high-performance hard aluminum alloy plate and strip according to claim 1, characterized in that: In the S5 step, the tempering time of the aluminum alloy inside the quenching furnace is set at 10 h, and the tempering temperature is set at 180°C.

5. A production process of a high-performance hard aluminum alloy plate and strip according to claim 2, characterized in that: In the a2 step and a3, the melting temperature for the melting treatment in the tilting furnace is set at 2 h.