JP2019136759A - Al ALLOY CAST MATERIAL MANUFACTURING METHOD - Google Patents

Abstract

To provide an Al alloy cast material manufacturing method that can appropriately adjust amounts of Ti to be added.SOLUTION: The Al alloy cast material manufacturing method, in which Al alloy molten metal W1 supplied to a casting machine 6 through a molten metal passage 4 is coagulated by the casting machine 6 to manufacture an Al alloy cast material W2, includes a primary Ti adding step in which Ti is previously added to the Al alloy molten metal W1 which has not yet passed through the molten metal passage 4 and a secondary Ti adding step in which Ti is added by a feeder 5 to the Al alloy molten metal passing through the molten metal passage 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for producing an Al alloy cast material for producing an Al alloy cast material that can be suitably used as a material of, for example, an aluminum (Al) alloy plastic work product, and a related technique.

  In recent years, Al alloy plastic processed products are often used as structural materials (parts) for transport machines such as vehicles, ships, aircraft, automobiles, and motorcycles that require high strength and high corrosion resistance.

  As an example of such an Al alloy plastic processed product of a structural material for transport aircraft, in an automotive part such as a suspension arm, for the purpose of reducing the weight of the vehicle body, the Al- A plastically processed product of Mg—Si alloy is used. Particularly, A6061 is frequently used among Al—Mg—Si based alloys, but high strength is required to further reduce the weight, and the material side of the Al alloy is improved.

For example, in order to increase the strength of an Al—Mg—Si alloy, the amount of excess Si or the amount of Cu element added is increased. In particular, Cu element promotes the precipitation of Mg ₂ Si and makes a solid solution in the matrix and greatly contributes to improving the strength. Therefore, increasing the addition amount is an effective means for increasing the strength.

  However, if the amount of Cu element added for increasing the strength exceeds a predetermined amount, the sensitivity to intergranular corrosion increases, and stress corrosion cracking may occur when used in a corrosive environment.

  Further, as disclosed in the following Patent Document 1, to increase the strength of an Al—Mg—Si based alloy, addition of Ti has been conventionally known as an effective means. Ti is a refining material, and influences during solidification to refine crystal grains and greatly contribute to strength improvement.

  For example, an Ti alloy containing Ti—B is used for the addition of Ti, and an alloy of Al-5% Ti-1% B is preferably used. However, it is most effective to add Ti immediately before casting. It is said to be appropriate. For this reason, in the prior art, it is common to add Ti to the Al alloy melt using a rod feeder immediately before pouring the Al alloy melt into the casting machine, for example, in a casting rod that supplies the Al alloy melt to the casting machine.

Patent No. 5275321

  However, in the conventional method for producing an Al alloy cast material, Ti is added immediately before casting using a rod feeder, so Ti-B may not be sufficiently added, which may lead to insufficient strength. there were. For example, when Ti is added with a rod feeder, if the casting speed is increased, the amount (flow rate) flowing per unit time in the Al alloy molten metal flowing in the casting iron also increases, so the supply capacity by the rod feeder cannot catch up, and Ti The amount added may be insufficient. Then, as described above, there was a problem that an appropriate amount of Ti could not be added and there was a risk of insufficient strength in the Al alloy cast material.

  In the above description, the case of producing an Al—Mg—Si alloy cast material has been described as an example. However, even in the case of producing an Al alloy cast material other than an Al—Mg—Si alloy, The same problem occurs when adding Ti.

  The present invention has been made in view of the above-described problems, and can provide a method for producing an Al alloy cast material capable of appropriately adjusting the amount of Ti added and producing a high-strength Al alloy cast material. The purpose is to provide the related technology.

  In order to solve the above problems, the present invention comprises the following means.

[1] A method for producing an Al alloy cast material, wherein an Al alloy melt supplied to a casting machine via a molten metal flow path is solidified by the casting machine to produce an Al alloy cast material,
A primary Ti addition step of adding Ti in advance to the Al alloy melt before flowing through the melt flow path;
A method for producing an Al alloy cast material, comprising: a secondary Ti addition step of adding Ti to a molten Al alloy flowing through the molten metal flow path by a feeder.

  [2] The method for producing an Al alloy casting according to item 1, wherein the Al alloy molten metal is composed of an Al—Mg—Si based alloy.

  [3] When the addition amount of Ti added in the primary Ti addition step is “X” mass%, the addition amount of Ti added in the secondary Ti addition step is “0.1X” mass% to “2X” mass%. 3. The method for producing an Al alloy cast material according to item 1 or 2, wherein the aluminum alloy cast material is adjusted.

  [4] Any one of items 1 to 3 above, wherein the time from the addition of Ti in the primary Ti addition step to the addition of Ti in the secondary Ti addition step is adjusted within 5 minutes to 30 minutes. The manufacturing method of Al alloy casting material as described in 2.

  [5] The method for producing an Al alloy cast material according to item 2, wherein the molten metal temperature in the molten metal flow path is adjusted to 700 ° C. ± 30 ° C.

  [6] Al alloy plasticity characterized in that an Al alloy plastic work product is produced by subjecting an Al alloy cast material produced by the production method according to any one of items 1 to 5 to plastic working. Manufacturing method of processed products.

  [7] The method for producing an Al alloy plastic processed product according to [6], wherein the Al alloy plastic processed product is used as a structural material for a transport aircraft.

[8] A molten metal storage section for storing the molten Al alloy to which Ti is added;
A casting machine that solidifies Al molten metal and casts an Al alloy casting material;
A molten metal flow path for supplying the Al alloy molten metal stored in the molten metal reservoir to the casting machine;
An apparatus for producing an Al alloy cast material, comprising: a feeder for adding Ti to an Al alloy melt flowing in the melt flow path.

  [9] The apparatus for producing an Al alloy cast material according to [8], wherein the molten metal storage unit is configured by a melting furnace for melting an Al alloy material or a holding furnace for adjusting the temperature of the molten Al alloy.

  [10] The Al alloy casting according to the above item 8, wherein the molten metal storage unit is constituted by a melting / holding furnace that serves as both a melting furnace for melting the Al alloy material and a holding furnace for adjusting the temperature of the Al alloy molten metal. Material manufacturing equipment.

  According to the method for producing an Al alloy cast material of the invention [1], since Ti is added in two steps, a primary Ti addition step and a secondary Ti addition step, an appropriate amount of Ti is surely added. can do. Therefore, problems due to insufficient addition of Ti can be prevented, and an Al alloy cast material having sufficient strength can be reliably manufactured.

  According to the method for producing an Al alloy cast material of the invention [2], an Al-Mg-Si alloy having excellent workability and high strength and high corrosion resistance is used as the Al alloy. An Al alloy casting material having strength and corrosion resistance can be provided.

  According to the method for producing an Al alloy cast material of the invention [3], since the Ti addition amount in the secondary Ti addition step is set within a specific range with respect to the Ti addition amount in the primary Ti addition step, the effect In particular, Ti can be added, and a high-strength and high-quality Al alloy casting can be more reliably produced.

  According to the method for producing an Al alloy cast material of the invention [4], since the time from the primary Ti addition step to the secondary Ti addition step is set to a specific range, it is possible to add Ti more effectively. It is possible to manufacture an Al alloy cast material with high strength and high quality even more reliably.

  According to the method for producing an Al alloy cast material of the invention [5], since the molten metal temperature of the Al alloy molten metal is set within a specific range in the secondary Ti addition step, the addition of Ti in the secondary Ti addition step is performed. This can be done even more effectively.

  According to the method for producing an Al alloy plastic work product of the invention [6], since the Al alloy cast material according to the above method invention is used, an Al alloy plastic work product having sufficient strength as described above can be surely obtained. Can be manufactured.

  According to the method for producing an Al alloy plastic processed product of the invention [7], a structural material for a transport aircraft having sufficient strength can be provided.

  According to the apparatus for producing an Al alloy cast material of the invention [8], since the invention [1] can be carried out, an Al alloy cast material having sufficient strength as described above can be reliably produced. .

  According to the Al alloy cast material manufacturing apparatus of the invention [9] and [10], the above effect can be obtained more reliably.

FIG. 1 is a block diagram showing a manufacturing apparatus to which an Al alloy cast material manufacturing method according to an embodiment of the present invention can be applied. FIG. 2 is a block diagram showing a manufacturing apparatus to which a method for manufacturing an Al alloy cast material according to a modification of the present invention can be applied.

  FIG. 1 is a block diagram showing an apparatus for producing an Al alloy cast material for carrying out a method for producing an Al alloy cast material according to an embodiment of the present invention.

  As shown in the figure, the production apparatus for an Al alloy cast material of the present embodiment includes a melting furnace 11, a first rod 21, a holding furnace 12, a second rod 22, a molten metal processing device 3, and a casting rod 4. The rod feeder 5 and the casting machine 6 are provided as basic components.

  The melting furnace 11 is for melting the Al alloy material to produce the Al alloy molten metal W1.

  The first rod 21 flows the Al alloy molten metal W1 in the melting furnace 11 along the rod 21 and supplies it to the holding furnace 12.

  The holding furnace 12 stabilizes the Al alloy molten metal W1 by adjusting components such as degassing while adjusting the Al alloy molten metal W1 to an optimum temperature.

  The second rod 22 is for flowing the Al alloy molten metal W <b> 1 in the holding furnace 2 along the rod 22 and supplying it to the molten metal treatment apparatus 3.

  The molten metal treatment device 3 removes impurities in the Al alloy molten metal W1 by using a bubbling action or the like.

  The cast iron 4 flows the Al alloy molten metal W1 in the molten metal treatment device 3 along the iron 4 and supplies it to the casting machine 6. In the present embodiment, the molten metal flow path is constituted by the casting rod 4.

  The rod feeder 5 is for adding Ti to the molten Al alloy W1 flowing in the casting rod 4. The rod feeder 5 of the present embodiment includes a coil 52 around which a rod 51 (Ti-containing material) made of an Al—Ti alloy or an Al—Ti—B alloy is wound, and the rod 51 is appropriately wound from the coil 52. By returning, Ti is added to the Al alloy molten metal W1 flowing through the casting iron 4.

  The casting machine 6 is a vertical semi-continuous casting machine. In the casting machine 6 of the present embodiment, the molten Al alloy W1 supplied from the casting rod 4 into the casting machine 6 is solidified through the mold 61, while the solidified Al alloy ingot W2 is supplied from the cooler 62. A rod-shaped Al alloy ingot (Al alloy cast material) W2 such as an Al alloy billet or an Al alloy slab is cast by being sent downward together with the lower mold 63 while being cooled by the cooling water. .

  In the present embodiment, an Al—Mg—Si alloy cast material to which Ti is added is produced using the above-described apparatus for producing an Al alloy cast material.

  That is, in the melting furnace 11, a predetermined alloy material is melted to produce an Al—Mg—Si-based Al alloy molten metal W1 that is a 6000 series Al alloy (6000-based Al alloy). This Al alloy molten metal W1 is supplied to the holding furnace 12 through the first rod 21, and the temperature of the Al alloy molten metal W1 is adjusted. Subsequently, the Al alloy molten metal W <b> 1 is supplied from the holding furnace 12 to the molten metal processing apparatus 3 through the second rod 22.

  Here, in this embodiment, Ti is added in the melting furnace 11 or the holding furnace 12. For example, when adding Ti in the melting furnace 11, Ti is added by melting an Al—Ti alloy or an Al—Ti—B alloy in the melting furnace 11 together with the above alloy material. In addition, when adding Ti in the holding furnace 12, an Al—Ti alloy or an Al—Ti—B alloy is added to the molten Al alloy in the holding furnace 12, and Ti is added.

  In the present embodiment, the step of adding Ti in the melting furnace 11 or the holding furnace 12 is referred to as a primary Ti addition step. Furthermore, in this embodiment, the molten metal storage part is comprised by the side to which Ti is added among the melting furnace 11 or the holding furnace 12. FIG.

  On the other hand, the Al alloy molten metal W1 supplied to the molten metal processing device 3 is supplied to the casting machine 6 through the casting rod 4 after impurities are removed.

  In the present embodiment, Ti is added to the Al alloy molten metal W1 that flows in the casting rod 4. That is, as described above, in the rod feeder 5, the Al-Ti alloy or Al-Ti-B alloy rod 51 (Ti-containing material) wound in a coil shape is appropriately rewound to allow Al to flow through the casting rod 4. Ti is added by putting it in the molten alloy W1. In the present embodiment, the step of adding Ti by the rod feeder 5 is referred to as a secondary Ti addition step.

  The molten Al alloy W1 supplied into the casting machine 6 is solidified, and the solidified Al alloy ingot W2 is sent downward to produce a rod-shaped Al alloy ingot (Al alloy cast material) W2. The

  Here, in this embodiment, the addition amount (mass%) of Ti in the secondary Ti addition process is in a range of 0.1 to 2 times the addition amount (mass%) of Ti in the primary Ti addition process. It is preferable to set to. In other words, when the Ti addition amount in the primary Ti addition step is “X” mass%, the Ti addition amount in the secondary Ti addition step is set to “0.1X” mass% to “2X” mass%. Is preferred. That is, when the amount of Ti added in the secondary Ti addition step by the rod feeder 5 is too large (in the case of more than 2X), in order to prevent excessive addition of Ti, the flow of the Al alloy molten metal W1 relatively in the casting rod 4 Although it is necessary to increase the speed, since the casting speed becomes too high, the quality of the Al alloy cast material W2 cannot be stabilized, which is not preferable. Conversely, if the amount of Ti added in the secondary Ti addition step by the rod feeder 5 is too small (less than 0.1X), it may be difficult to obtain a sufficient strength improvement effect. The reason for this is that Ti is said to be most effective when added immediately before casting. Therefore, Ti addition in the secondary Ti addition process is more effective than Ti addition in the primary Ti addition process. It is. Therefore, if the amount of Ti added in the secondary Ti addition step is not sufficient, the amount of Ti added in the primary Ti addition step, which is less effective, must be increased, and it becomes difficult to obtain a sufficient strength improvement effect. There is a fear and it is not preferable.

  In the present embodiment, the time from when Ti is added in the primary Ti addition step to when Ti is added in the secondary Ti addition step is set to 5 minutes or more and within 30 minutes (5 to 30 minutes). Is preferred. That is, in consideration of the melt treatment time in the melting furnace 1 and the holding furnace 2, the melt speed of the first rod 71 and the second rod 72, the time from the primary Ti addition step to the secondary Ti addition step is less than 5 minutes. It is difficult to construct a production facility, which is not preferable. Further, as described above, since it is effective to add Ti immediately before casting, if the time from the primary Ti addition step to the secondary Ti addition step exceeds 30 minutes, the primary Ti addition step It takes a long time from casting to casting, and Ti addition in the primary Ti addition step becomes too fast, so that the effect of addition of Ti in the primary Ti addition step cannot be sufficiently obtained, which is not preferable.

  In the present embodiment, in the case of an Al—Mg—Si alloy, the molten metal temperature in the casting rod 4 when adding an Al—Ti alloy or an Al—Ti—B alloy from the rod feeder 5 is 700 ° C. ± 30 ° C is preferred. Alternatively, the liquidus temperature is preferably + 55 ° C ± 30 ° C.

  The Al alloy cast material W2 of the present embodiment manufactured in the above procedure is, for example, subjected to plastic processing such as extrusion, rolling, drawing, forging, and the like, and an Al alloy plastic processed product is manufactured. is there.

  Further, in the present embodiment, the Al alloy plastic processed product can be suitably used as a structural material of a transport device such as a vehicle, a ship, an airplane, an automobile, or a motorcycle that requires high strength and high corrosion resistance.

  As described above, according to the method for producing an Al alloy cast material of the present embodiment, since Ti is added in two steps of the primary Ti addition step and the secondary Ti addition step, sufficient Ti is added. An effect of the addition of Ti, that is, an Al alloy cast material having sufficient strength and corrosion resistance can be obtained.

  In particular, simply by adding Ti by the rod feeder 5 (corresponding to the secondary Ti addition step) as in the past, if the casting speed increases, the Ti supply capability by the rod feeder 5 cannot catch up, and the strength decreases due to insufficient Ti. May be incurred. On the other hand, according to the manufacturing method of this embodiment, in addition to Ti addition (secondary Ti addition step) by the rod feeder 5, a primary Ti addition step of adding Ti in advance is performed. Even when the Ti supply capability in the addition step cannot catch up, the shortage can be reliably replenished in the primary Ti addition step. Accordingly, an appropriate amount of Ti can be surely added, strength reduction due to lack of Ti can be prevented, and sufficient strength can be reliably obtained.

  In this embodiment, since an Al—Mg—Si alloy having excellent workability and high strength and high corrosion resistance is used as the Al alloy, an Al alloy casting material having higher strength and corrosion resistance is used. As a result, an Al alloy plastic processed product can be provided.

  In the present embodiment, since the addition amount of Ti in the secondary Ti addition step is set in a range of 0.1 to 2 times the addition amount of Ti in the primary Ti addition step, As described above, Ti can be effectively added, and a high-strength, high corrosion resistance and high-quality Al alloy cast material can be more reliably produced.

  In this embodiment, since the time from the primary Ti addition step to the secondary Ti addition step is set within 5 minutes to 30 minutes, Ti can be added more effectively, High corrosion resistance and high quality Al alloy cast material can be manufactured in a more stable state.

  In the above embodiment, the primary Ti addition step is performed in the melting furnace 11 or the holding furnace 12, but the present invention is not limited to this, and in the present invention, the Al alloy molten metal W1 is cast iron as a molten metal flow path. If it is before circulating 4, that is, upstream of the casting rod 4, Ti may be added by the primary Ti addition step at any stage. For example, Ti addition by the primary Ti addition step may be performed by the first rod 21 or the second rod 22 or may be performed by the molten metal processing apparatus 3.

  In the above embodiment, the rod feeder 5 for supplying Ti-containing material in the form of rods to wire rods is used to add Ti in the primary Ti addition step. However, the present invention is not limited to this. A feeder other than the rod feeder can also be used. For example, a feeder that supplies powdery to granular Ti-containing material to the molten Al alloy can also be used.

  FIG. 2 is a block diagram showing an apparatus for producing an Al alloy cast material for carrying out a method for producing an Al alloy cast material according to a modification of the present invention.

  As shown in the drawing, the Al alloy cast material manufacturing apparatus of this modification differs from the manufacturing apparatus of the embodiment shown in FIG. 1 in the melting furnace 11 and the holding furnace 12 in the manufacturing apparatus of the embodiment. Instead, the melting / holding furnace 10 is provided in the manufacturing apparatus of this modification. The melting / holding furnace 10 serves as both the melting furnace 11 and the holding furnace 12, and has the functions of both furnaces 11 and 12. In this modification, the melting / holding furnace 10 constitutes a molten metal storage section.

  Since the other configuration of the Al alloy cast material manufacturing apparatus according to this modification is substantially the same as that of the above-described embodiment, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

  Also in the Al alloy cast material manufacturing apparatus of this modification, the same effect as the above embodiment can be obtained. In addition, in this manufacturing apparatus, one melting / holding furnace 10 serves as two apparatuses (melting furnace 11 and holding furnace 12), so that the entire manufacturing facility can be made compact and compact. Can do.

  The method for producing an Al alloy cast material of the present invention can be suitably used for producing an Al alloy cast material used as a raw material for, for example, an extruded product of Al alloy, a rolled material, or a forged material.

10: Melting / holding furnace (melt storage part)
11: Melting furnace (melt storage part)
12: Holding furnace (melt storage part)
4: Cast iron (melt channel)
5: Rod feeder (feeder)
6: Casting machine W1: Al alloy molten metal W2: Al alloy ingot (Al alloy cast material)

Claims (10)

A method for producing an Al alloy casting material, wherein an Al alloy molten metal supplied to a casting machine via a molten metal flow path is solidified by the casting machine to produce an Al alloy casting material,
A primary Ti addition step of adding Ti in advance to the Al alloy melt before flowing through the melt flow path;
A method for producing an Al alloy cast material, comprising: a secondary Ti addition step of adding Ti to a molten Al alloy flowing through the molten metal flow path by a feeder.   The method for producing an Al alloy casting according to claim 1, wherein the molten Al alloy is composed of an Al-Mg-Si alloy.   When the amount of Ti added in the primary Ti addition step is “X” mass%, the amount of Ti added in the secondary Ti addition step is adjusted to “0.1X” mass% to “2X” mass%. The manufacturing method of the Al alloy casting material of Claim 1 or 2 which was made to do.   The time from when Ti is added in the primary Ti addition step to when Ti is added in the secondary Ti addition step is adjusted within 5 minutes to 30 minutes. Manufacturing method of Al alloy casting material.   The method for producing an Al alloy cast material according to claim 2, wherein a melt temperature in the melt flow path is adjusted to 700 ° C ± 30 ° C.   An Al alloy plastic work product characterized in that an Al alloy plastic work product is produced by subjecting an Al alloy cast material produced by the production method according to any one of claims 1 to 5 to a plastic work. Manufacturing method.   The method for producing an Al alloy plastic processed product according to claim 6, wherein the Al alloy plastic processed product is used as a structural material of a transport aircraft. A molten metal storage part for storing the Al alloy molten metal to which Ti is added;
A casting machine that solidifies Al molten metal and casts an Al alloy casting material;
A molten metal flow path for supplying the Al alloy molten metal stored in the molten metal reservoir to the casting machine;
An apparatus for producing an Al alloy cast material, comprising: a feeder for adding Ti to an Al alloy melt flowing in the melt flow path.   The said molten metal storage part is a manufacturing apparatus of the Al alloy cast material of Claim 8 comprised by the melting furnace which melts Al alloy material, or the holding furnace which adjusts the temperature of Al alloy molten metal. 9. The Al alloy casting material according to claim 8, wherein the molten metal storage part is configured by a melting / holding furnace that serves both as a melting furnace for melting the Al alloy material and a holding furnace for adjusting the temperature of the Al alloy molten metal. manufacturing device.

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