CN104313423B - The manufacture method of magnesium base composite material wallboard section bar - Google Patents

Abstract

The manufacture method of magnesium base composite material wallboard section bar, the present invention relates to a kind of method manufacturing magnesium base composite material wallboard section bar, and it is in order to solve the problem that in existing manufacture wallboard section bar, the easy vexed car of extrusion process, the flexibility of section bar and twist are higher.Manufacture method: one, melting raw material in smelting furnace；Two, SiC particulate is added；Three, the flat casting rod of magnesium base composite material it is cast as；Four, flat casting rod is cut off；Five, car descale；Six, homogenizing annealing is carried out；Seven, the magnesium base composite material rectangle ingot after annealing is extruded；Eight, magnesium base composite material wallboard section bar is heated to 150 DEG C～180 DEG C, then carries out stretcher leveling；Nine, truncate and tail end.The flexibility every meter being obtained magnesium base composite material wallboard section bar by the manufacture method of the present invention is less than 1.5mm, and in every meter of length at any position of section bar, the twist around the longitudinal axis is less than 1.5 °, and extrusion process does not occur vexed car.

Description

Manufacturing method of magnesium-based composite wall panel profile

technical field

The invention relates to a method for manufacturing a magnesium-based composite material wall board profile.

Background technique

Magnesium-based composites have the advantages of light weight, high specific strength, high specific stiffness and good wear resistance, and are increasingly used in aerospace, military and automotive industries. Particle-reinforced magnesium-based composites have the characteristics of low cost and simple preparation process, and have gradually become the focus of research in the field of magnesium-based composites. Existing siding profiles are made of magnesium alloy, which are obtained by extruding a circular extrusion cylinder. The degree of extrusion deformation is large, and the extrusion process is stuffy. The profile dimensions and straightness exceed the range required by the standard, and the curvature per meter is 2.5 mm to 3.5mm, the torsion around the longitudinal axis per meter of any part of the profile is 2.0° to 3.0°, and the wave height is 1.0mm to 2.0mm, which cannot meet the requirements of users.

Contents of the invention

The present invention provides a method for manufacturing a magnesium-based composite wall plate profile in order to solve the problems that the extrusion process is easy to be stuffy and the profile has a high degree of curvature and torsion in the existing wall plate profile production.

The manufacture method of the magnesium-based composite material wall plate profile of the present invention is realized by the following steps:

1. According to the mass percentage of elements, Al: 0.2%, Mn: 1.3%-2.2%, Zn: 0.3%, Ce: 0.15%-0.35%, Fe: ≤0.05%, Si: ≤0.1%, Cu: ≤0.05 %, Ni: ≤0.007%, and the balance is Mg. Weigh aluminum ingots, magnesium-manganese master alloys, zinc ingots, magnesium-cerium master alloys, magnesium-iron master alloys, magnesium-silicon master alloys, copper ingots, magnesium-nickel master alloys and magnesium Ingots are used as raw materials, and the raw materials are added to a dry smelting furnace, and smelted at a temperature of 760°C to 780°C for 3.5h to 5h to obtain a magnesium alloy melt;

2. Preheat the SiC particles, the preheating temperature is 490℃～510℃, the holding time is 1.5h～2.5h, add the preheated SiC particles into the magnesium alloy melt obtained in step 1, and stir for 10min～ 15min, obtain magnesium-based composite material melt;

3. The magnesium-based composite material melt obtained in step 2 is cast at a casting temperature of 710°C-740°C, a casting speed of 2.0m/h-2.4m/h, a cooling water strength of 0.05MPa-0.10MPa and a cooling water temperature of 0.05MPa-0.10MPa. A magnesium-based composite material flat cast rod with a cross-sectional aspect ratio of 3.2 to 3.6 is cast under the condition of 10°C to 20°C;

Four, the magnesium-based composite material flat cast rod that step 3 is obtained is cut off, obtains the flat cast rod after cutting;

5. Remove the casting scale on the surface of the cut-off flat cast rod by car to obtain a magnesium-based composite material flat cast ingot that has been descaled;

6. Perform homogenization annealing of the descaled magnesium-based composite flat ingot in an annealing furnace with an annealing temperature of 380°C to 400°C for 10h to 15h, and cool down with the furnace to obtain the annealed magnesium-based composite flat ingot;

7. Put the annealed flat cast ingot of magnesium-based composite material into a heating furnace and heat it to 360°C-430°C, and then put it into the flat extrusion barrel of the extruder. Under the condition of ~430°C, extrude at an outflow speed of 0.3m/min~0.7m/min to obtain magnesium-based composite wall panel profiles;

8. Heat the magnesium-based composite wallboard profile to 150°C to 180°C, then perform tension straightening and stretching, and perform roller straightening and manual straightening in turn to obtain the straightened magnesium-based composite wallboard profile ;

Nine, cut off the head end and tail end of the magnesium-based composite material wall panel profile after straightening, and complete the manufacture of the magnesium-based composite material wall panel profile;

Wherein the addition amount of the SiC particles in the second step accounts for 3%-6% of the integral fraction of the magnesium alloy melt.

The manufacturing method of the magnesium-based composite material wall plate profile of the present invention adopts a reasonable ratio of alloy components, adopts homogenization annealing to eliminate intragranular segregation and casting stress, and reasonably controls the distribution ratio of ingot components to ensure stable composition and uniform structure of the ingot. , so that the magnesium matrix composites have good plastic deformation ability.

The siding profile is a special profile that is wide and thin with many ribs. The flat extrusion cylinder is used to extrude the panel profile. Since the cross-sectional area of the flat extrusion cylinder is small and its shape is similar to that of the wall panel, compared with the existing round extrusion cylinder, the extrusion coefficient of the flat extrusion cylinder is small and relatively High pressure, uniform metal flow, no stuffiness; the extruded wallboard profiles are accurate in size and easy to straighten. The magnesium matrix has a close-packed hexagonal crystal structure with low symmetry, and its axial ratio (c/a) value is 1.623, which is close to the ideal close-packed value of 1.633. There are few slip systems at room temperature and it is difficult to form by cold working. If the processing temperature of magnesium-based composite wall panel profiles is lower than 150 °C, the plastic deformation of polycrystalline magnesium is limited to the base surface {0001} Slip and Cone Twins, there are only 3 geometric slip systems and 2 independent slip systems during deformation, and it is easy to generate large stress concentration at the grain boundary. However, step 8 of the present invention heats the magnesium-based composite wall plate profile to 150°C to 180°C. When the temperature is higher than 150°C, the amplitude of atomic vibration is increased, and the difference between the closest-packed surface and the second-closed-packed surface is reduced. make the additional pyramid slip surface At this time, the plasticity is greatly improved; at the same time, the softening caused by recovery and recrystallization will also make the magnesium matrix have higher plasticity, so the preheating straightening and stretching process is adopted subsequently to achieve the surface quality of the wall panel profile It is required that the bending degree of the panel profile be less than 1.5mm per meter, the twisting degree of any part of the profile around the longitudinal axis per meter length is not more than 1.5°, and the wave height is less than 0.5mm.

Description of drawings

Fig. 1 is the schematic diagram of the cross-sectional structure of the magnesium-based composite flat cast rod obtained in Step 3 of the present invention, wherein b represents the width of the cross-section, h represents the height of the cross-section, and R represents the radius of the arc.

detailed description

Specific implementation mode one: the manufacturing method of the magnesium-based composite material wall plate profile of this implementation mode is implemented according to the following steps:

1. According to the mass percentage of elements, Al: 0.2%, Mn: 1.3%-2.2%, Zn: 0.3%, Ce: 0.15%-0.35%, Fe: ≤0.05%, Si: ≤0.1%, Cu: ≤0.05 %, Ni: ≤0.007%, and the balance is Mg. Weigh aluminum ingots, magnesium-manganese master alloys, zinc ingots, magnesium-cerium master alloys, magnesium-iron master alloys, magnesium-silicon master alloys, copper ingots, magnesium-nickel master alloys and magnesium Ingots are used as raw materials, and the raw materials are added to a dry smelting furnace, and smelted at a temperature of 760°C to 780°C for 3.5h to 5h to obtain a magnesium alloy melt;

2. Preheat the SiC particles, the preheating temperature is 490℃～510℃, the holding time is 1.5h～2.5h, add the preheated SiC particles into the magnesium alloy melt obtained in step 1, and stir for 10min～ 15min, obtain magnesium-based composite material melt;

3. The magnesium-based composite material melt obtained in step 2 is cast at a casting temperature of 710°C-740°C, a casting speed of 2.0m/h-2.4m/h, a cooling water strength of 0.05MPa-0.10MPa and a cooling water temperature of 0.05MPa-0.10MPa. A magnesium-based composite material flat cast rod with a cross-sectional aspect ratio of 3.2 to 3.6 is cast under the condition of 10°C to 20°C;

Four, the magnesium-based composite material flat cast rod that step 3 is obtained is cut off, obtains the flat cast rod after cutting;

5. Remove the casting scale on the surface of the cut-off flat cast rod by car to obtain a magnesium-based composite material flat cast ingot that has been descaled;

6. Perform homogenization annealing of the descaled magnesium-based composite flat ingot in an annealing furnace with an annealing temperature of 380°C to 400°C for 10h to 15h, and cool down with the furnace to obtain the annealed magnesium-based composite flat ingot;

7. Put the annealed flat cast ingot of magnesium-based composite material into a heating furnace and heat it to 360°C-430°C, and then put it into the flat extrusion barrel of the extruder. Under the condition of ~430°C, extrude at an outflow speed of 0.3m/min~0.7m/min to obtain magnesium-based composite wall panel profiles;

8. Heat the magnesium-based composite wallboard profile to 150°C to 180°C, then perform tension straightening and stretching, and perform roller straightening and manual straightening in turn to obtain the straightened magnesium-based composite wallboard profile ;

Nine, cut off the head end and tail end of the magnesium-based composite material wall panel profile after straightening, and complete the manufacture of the magnesium-based composite material wall panel profile;

Wherein the addition amount of the SiC particles in the second step accounts for 3%-6% of the integral fraction of the magnesium alloy melt.

Within a certain range of deformation, the greater the extrusion coefficient, the higher the strength and hardness of the panel profile. When reducing the extrusion factor, the strength of the siding profile suffers. Therefore, this embodiment adopts SiC particles to reinforce the magnesium-based composite material. As the reinforcing phase of the magnesium alloy matrix, SiC particles are mainly distributed between the grain boundaries, which can prevent the movement of grain boundaries and dislocations, resulting in a significant increase in strength to compensate for the strength loss of the wall plate profile caused by the reduction in extrusion deformation.

In Step 9 of this embodiment, since the front end of the extruded product retains the casting structure, the mechanical properties are relatively low, so it should be removed; at the tail end, defects that destroy the continuity of the metal, such as the extruded tail formed by insufficient metal filling, should also be removed.

Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, raw materials are added into a dry smelting furnace and smelted at a temperature of 770° C. for 4 hours. Other steps and parameters are the same as those in Embodiment 1.

Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the particle size of the SiC particles described in Step 2 is 5 μm˜8 μm. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

Embodiment 4: The difference between this embodiment and Embodiments 1 to 3 is that in step 3, the two sides of the cross-section are arc-shaped, the width b of the cross-section is 545-565 mm, and the height h is 150-170 mm. Magnesium matrix composite flat cast rod. Other steps and parameters are the same as those in Embodiments 1 to 3.

The middle part of the cross-section of the magnesium-based composite flat cast rod described in this embodiment is a rectangle, and the short side of the rectangle is a semicircle, and the radius R of the semicircle is h/2.

Embodiment 5: This embodiment is different from Embodiment 1 to Embodiment 4 in that the length of the flat cast rod after cutting in Step 4 is 900mm-950mm. Other steps and parameters are the same as in one of the specific embodiments 1 to 4.

Embodiment 6: The difference between this embodiment and one of Embodiments 1 to 5 is that in step 6, homogenization annealing is performed in an annealing furnace with an annealing temperature of 390° C. for 12 hours. Other steps and parameters are the same as one of the specific embodiments 1 to 5.

Embodiment 7: This embodiment differs from Embodiment 1 to Embodiment 6 in that step 7 is extruded at a pressure of 530 MPa and a temperature of 390° C. at an outflow velocity of 0.5 m/min. Other steps and parameters are the same as one of the specific embodiments 1 to 6.

Embodiment 8: This embodiment is different from Embodiment 1 to Embodiment 7 in that Step 8 heats the magnesium-based composite wall plate profile to 160°C. Other steps and parameters are the same as one of the specific embodiments 1 to 7.

Embodiment 9: The difference between this embodiment and Embodiment 1 to Embodiment 8 is that the tensile deformation rate of step 8 is 1% to 3% in tension straightening and stretching. Other steps and parameters are the same as those in Embodiments 1 to 8.

Embodiment 1: The manufacturing method of the magnesium-based composite wall plate profile of this embodiment is implemented according to the following steps:

1. According to the mass percentage of elements, Al: 0.2%, Mn: 1.8%, Zn: 0.3%, Ce: 0.2%, Fe: 0.03%, Si: 0.02%, Cu: 0.02%, Ni: 0.003%, and the balance Weigh aluminum ingots, magnesium-manganese master alloys, zinc ingots, magnesium-cerium master alloys, magnesium-iron master alloys, magnesium-silicon master alloys, copper ingots, magnesium-nickel master alloys and magnesium ingots as raw materials for Mg, and add the raw materials to the dry In the smelting furnace, smelting at a temperature of 770°C for 4 hours to obtain a magnesium alloy melt;

2. Preheat the SiC particles with a particle size of 6 μm. The preheating temperature is 500°C, and the holding time is 2.0h. The preheated SiC particles are quickly added to the magnesium alloy melt prepared in step 1, and stirred for 13 minutes. The amount of SiC particles added is 4% of the integral fraction of the magnesium alloy melt to obtain a magnesium-based composite material melt;

3. Cast the molten magnesium-based composite material obtained in step 2 into a cross-section at a casting temperature of 730°C, a casting speed of 2.2m/h, a cooling water strength of 0.08MPa, and a cooling water temperature of 15°C. Magnesium-based composite material flat cast rod with a width of 555mm and a height of 160mm;

Four, the magnesium-based composite material flat cast rod that step 2 is obtained is cut off, and the length obtained after cutting is a 930mm flat cast rod;

Five, car removes the casting scale on the surface of the flat cast rod after cutting, and obtains a magnesium-based composite material flat cast ingot that is 545mm wide and 150mm high in scale;

6. Perform homogenization annealing on the descaled magnesium-based composite flat ingot in an annealing furnace with an annealing temperature of 390° C. for 12 hours, and cool with the furnace to obtain an annealed magnesium-based composite flat ingot;

7. Put the annealed magnesium-based composite flat ingot into a heating furnace and heat it to 400°C, then put it into the flat extrusion barrel of the extruder, and flow it out under the conditions of a pressure of 530MPa and a temperature of 390°C Extruding at a speed of 0.5m/min to obtain a magnesium-based composite wall plate profile;

8. Heating the magnesium-based composite wall plate profile to 160°C, then performing tension straightening and stretching, the tensile deformation rate is 2%, and performing roller straightening and manual straightening in turn to obtain the straightened magnesium-based Composite siding profiles;

9. Cut off the 150mm head end and the 300mm tail end of the straightened magnesium-based composite material wall plate profile to complete the manufacture of the magnesium-based composite material wall plate profile.

The degree of curvature of the magnesium-based composite panel profile obtained in this embodiment is 1.2 mm per meter, the twist degree of any part of the profile around the longitudinal axis is 1° per meter, and the wave height is 0.3 mm. In this embodiment, the bending degree, twisting degree and wave height are tested according to GB/T14846-2008 standard. The profile has good surface quality, high dimensional accuracy, yield rate of 80%, stable mechanical properties, tensile strength of 350MPa, and elongation of 6.5%. In the extrusion process, due to the small extrusion coefficient and high specific pressure, the required extrusion force is small, and the metal flow is uniform, so there is no stuffy phenomenon.

Claims (9)

1. The manufacture method of magnesium-based composite material wall panel profile is characterized in that it is realized in the following steps: 1. According to the mass percentage of elements, Al: 0.2%, Mn: 1.3%-2.2%, Zn: 0.3%, Ce: 0.15%-0.35%, Fe: ≤0.05%, Si: ≤0.1%, Cu: ≤0.05 %, Ni: ≤0.007%, and the balance is Mg. Weigh aluminum ingots, magnesium-manganese master alloys, zinc ingots, magnesium-cerium master alloys, magnesium-iron master alloys, magnesium-silicon master alloys, copper ingots, magnesium-nickel master alloys and magnesium Ingots are used as raw materials, and the raw materials are added to a dry smelting furnace, and smelted at a temperature of 760°C to 780°C for 3.5h to 5h to obtain a magnesium alloy melt; 2. Preheat the SiC particles, the preheating temperature is 490℃～510℃, the holding time is 1.5h～2.5h, add the preheated SiC particles into the magnesium alloy melt obtained in step 1, and stir for 10min～ 15min, obtain magnesium-based composite material melt; 3. The magnesium-based composite material melt obtained in step 2 is cast at a casting temperature of 710°C-740°C, a casting speed of 2.0m/h-2.4m/h, a cooling water strength of 0.05MPa-0.10MPa and a cooling water temperature of 0.05MPa-0.10MPa. A magnesium-based composite material flat cast rod with a cross-sectional aspect ratio of 3.2 to 3.6 is cast under the condition of 10°C to 20°C; Four, the magnesium-based composite material flat cast rod that step 3 is obtained is cut off, obtains the flat cast rod after cutting; 5. Remove the casting scale on the surface of the cut-off flat cast rod by car to obtain a magnesium-based composite material flat cast ingot that has been descaled; 6. Perform homogenization annealing of the descaled magnesium-based composite flat ingot in an annealing furnace with an annealing temperature of 380°C to 400°C for 10h to 15h, and cool down with the furnace to obtain the annealed magnesium-based composite flat ingot; 7. Put the annealed flat cast ingot of magnesium-based composite material into a heating furnace and heat it to 360°C-430°C, and then put it into the flat extrusion barrel of the extruder. Under the condition of ~430°C, extrude at an outflow speed of 0.3m/min~0.7m/min to obtain magnesium-based composite wall panel profiles; 8. Heat the magnesium-based composite wallboard profile to 150°C to 180°C, then perform tension straightening and stretching, and perform roller straightening and manual straightening in turn to obtain the straightened magnesium-based composite wallboard profile ; Nine, cut off the head end and tail end of the magnesium-based composite material wall panel profile after straightening, and complete the manufacture of the magnesium-based composite material wall panel profile; Wherein the addition amount of the SiC particles in the second step accounts for 3%-6% of the integral fraction of the magnesium alloy melt. 2. The method for manufacturing magnesium-based composite wall panel profiles according to claim 1, characterized in that in step 1, the raw materials are added to a dry melting furnace and smelted at a temperature of 770° C. for 4 hours. 3 . The method for manufacturing magnesium-based composite wall panel profiles according to claim 1 , characterized in that the SiC particles in step 2 have a particle size of 5 μm to 8 μm. 4 . 4. The manufacturing method of the magnesium-based composite wall panel profile according to claim 1, characterized in that the two sides of the cross-section cast in step 3 are arc-shaped, the width of the cross-section is 545-565 mm, and the height is 150-50 mm. 170mm flat cast bar of magnesium matrix composite material. 5 . The method for manufacturing a magnesium-based composite wall plate profile according to claim 1 , wherein the length of the flat cast rod after cutting in step 4 is 900 mm to 950 mm. 6 . 6 . The method for manufacturing magnesium-based composite wall panel profiles according to claim 1 , characterized in that in step six, homogenization annealing is performed in an annealing furnace with an annealing temperature of 390° C. for 12 hours. 7 . The method for manufacturing magnesium-based composite wall panel profiles according to claim 1 , characterized in that in step 7, extrusion is carried out at a pressure of 530 MPa and a temperature of 390° C. at an outflow speed of 0.5 m/min. 8. The manufacturing method of the magnesium-based composite material wall plate profile according to claim 1, characterized in that step 8 the magnesium-based composite material wall plate profile is heated to 160°C. 9. The manufacturing method of magnesium-based composite wallboard profiles according to claim 1, characterized in that the tensile deformation rate of the eighth step of tension straightening and stretching is 1% to 3%.