JP2010031360A - Casting part and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for achieving production high in cost effectiveness, and casting parts. <P>SOLUTION: The invention relates to manufacturing of the casting parts made of an aluminum alloy for die casting. The casting parts are subjected to heat treatment after casting. The breaking elongation 5 of the casting parts is ≥10%, and the yield point Rp<SB>0.2</SB>thereof is <120 MPa. Stabilization annealing treatment of single step is executed, and the aluminum alloy for die casting which has 7% in the breaking elongation A5 of the casting parts and ≥110 MPa in yield point Rp<SB>0.2</SB>is used. Further, the invention relates to the casting parts manufactured by the method of this type. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for producing a cast part made of an aluminum die cast alloy of the type disclosed in the preamble of claim 1. The invention further relates to a cast part made of an aluminum die cast alloy of the type disclosed in the preamble of claim 11.

  To use these types of cast parts made of aluminum die-casting alloys, for example in the automotive industry, they are now usually subjected to a heat treatment process after primary formation and casting.

  As a result of such a heat treatment, a cast part is produced that can achieve, for example, short-term thermal stability over a period of 1 hour at 205 ° C. or long-term thermal stability over a period of 1000 hours at 150 ° C., for example. In that case, short-term thermal stability is, for example, when baking to a layered coating, the baking process is carried out for example for 20 minutes at 170 ° C., so that the car body has adequate thermal stability. is necessary. Long-term thermal stability is essential, for example, in order that a cast part can withstand the corresponding temperatures generated by the motor, for example during vehicle operation, or acting on the part by solar radiation.

In that case, it is possible to produce a cast part having reduced ductility and impact resistance, for example, the cast part has a yield point Rp _0.2 of between 120 MPa and 165 MPa, for example, and an elongation at break A ₅ Is 7% or more. Accordingly, corresponding parts with an appropriate level of ductility can be produced and used, for example, in the region of the deformable zone.

  Recently, in order to be able to produce these parts, for example, alloys containing a high proportion of the alloying elements Ti, Zr and Mo have to be used. However, these alloying elements are very expensive, so their cast parts will eventually be very expensive.

  Accordingly, it is an object of the present invention to provide a method and cast part of the type described above that can achieve cost-effective manufacturing.

  This object is achieved according to the invention by a method and cast parts having the features of claims 1 and 11. Advantageous embodiments with useful and significant developments of the invention are disclosed in the independent claims.

To provide a process for producing the elongation at break A ₅ is not less more than 7% yield point Rp _0.2 is cast components is not less than 110MPa as much as possible cost-effective increases, the present invention, the cast parts, in the state of the cast, elongation at break _{a 5} of 10% or more, a yield point _{Rp 0.2} is less than 120 MPa, and, annealing for stabilization at temperatures of 120 to 260 ° C. after a primary form (stable An aluminum die-cast alloy that is subjected to an annealing treatment is used for the cast part. Thus, the stabilization annealing process allows the use of a corresponding suitable aluminum die casting alloy in a simple manner, so that sufficient values are still obtained even after heat treatment.

  These sufficient values are necessary to produce aluminum die cast parts with suitable properties, so that they can be used, for example, in the region of deformable zones in the automotive manufacturing field. However, it should also be noted that, as encompassed within the scope of the present invention, this cast part is in no way limited to use within the region of the car's deformable zone. This cast part can also be used in other parts, for example in the area of the chassis or in the area of externally mounted parts or elements.

In accordance with the present invention, the part has a short-term thermal stability of 205 ° C. for 1 hour and a long-term of 1000 hours at 150 ° C. without significantly changing the mechanical properties such as elongation at break A ₅ and yield point Rp _0.2. It is possible to achieve a sufficient level of thermal stability of the cast part in a simple manner so as to maintain thermal stability.

  Accordingly, it is possible to produce a particularly cost-effective aluminum die casting alloy containing less than 8.5% by weight of silicon, in particular 8.3% by weight or less. Such a low silicon content in a die-cast alloy can be compensated specifically by an optimum magnesium content.

  In a further embodiment of the invention, it has proven advantageous if the magnesium content is less than 0.6% by weight, in particular in the range 0.02-0.3% by weight. Thus, the above-mentioned properties of the aluminum die-cast alloy allow for as cost-effective production as possible to achieve the required values of cast parts, especially after heat treatment, without the need to add large amounts of Ti, Zr or Mo, for example. .

In a further embodiment of the invention,
4 to 8.2 weight percent silicon,
0.5-0.6% by weight manganese,
0.15 to 0.2 weight percent iron;
0.04 to 0.2 weight percent magnesium;
0.04-0.08 wt% titanium,
14 × 10 ⁻³ to 18 × 10 ⁻³ wt% strontium (140 to 180 ppm)
In the case of using an aluminum die-cast alloy made of aluminum containing the alloying elements, and the balance containing impurities generated by the above manufacturing method individually up to 0.05% by weight and up to 0.2% by weight as a whole Has also proved advantageous.

  Thus, these types of aluminum die cast alloys not only have a very low silicon content and optimum magnesium content, but in particular can often eliminate the alloying elements Ti, Zr and Mo. Features. That is, these alloy elements have a particular effect because they increase the price of aluminum die casting alloys.

In a further embodiment of the present invention, elongation at break A ₅ of the cast part cast 11% or more, it has also been demonstrated that when using a particular 12% or more comprising an aluminum die casting alloy which is advantageous. Thus, the cast component is a heat treatment or after the stabilization anneal process should have ensured a sufficient elongation at break A ₅ of 7% or more.

Even after the heat treatment, particularly advantageous for the production of cast parts having a elongation at break A ₅ are preferably die-cast aluminum alloy elongation at break A ₅ of the cast part cast is more than 13% using Is done.

It is further advantageous to use an aluminum die cast alloy in which the cast part is in an as-cast state and the yield point Rp _0.2 is 105 MPa or more, particularly 110 MPa or more. Therefore, starting from the yield point _{Rp 0.2,} made after heat treatment in a simple manner can be realized more necessary yield point _{Rp 0.2} 120 MPa.

In order to obtain a higher yield point after stabilization annealing, it has also proved advantageous to set the magnesium content of the aluminum die cast alloy within a range of up to 0.6% by weight. Is an as-cast state with a yield point Rp _0.2 of 80 MPa or more, in particular 85 MPa or more.

  In a further embodiment of the invention, it has also been demonstrated that it is advantageous if the stabilization annealing process is carried out at a temperature of 200-240 ° C. Thus, it is possible to achieve a particularly rapid annealing process, the duration of which is, for example, shorter than 180 minutes, in particular shorter than 60 minutes.

Specifically, the stabilization annealing treatment is finally performed so that the yield point Rp _{0.2 of the} heat-treated cast part is 115 MPa or more and 220 MPa or less, particularly 125 MPa or more and 165 MPa or less. Therefore, for example, a particularly advantageous component that can be used in the vehicle body structure of a passenger car can be obtained.

  Naturally, the above-mentioned advantages explained in connection with the method according to the invention also apply to the cast part according to claim 11.

  Further advantages, features and details of the present invention are disclosed in the following description of preferred embodiments.

(First embodiment)
According to the first embodiment,
7.8-8.2 wt% silicon,
0.5-0.6% by weight manganese,
0.15 to 0.2 weight percent iron;
0.04 to 0.08 weight percent magnesium;
0.04-0.08 wt% titanium,
14 × 10 ⁻³ to 18 × 10 ⁻³ wt% strontium (140 to 180 ppm)
An aluminum die-cast alloy made of aluminum is used, which contains the above-described alloy elements, and the balance contains impurities generated by a manufacturing method of up to 0.05% by weight and up to 0.2% by weight as a whole.

After the aluminum die casting alloy, the cast component is formed or primarily been cast, elongation at break A ₅ is 10% or more, a yield point Rp _0.2 is less than 120 MPa, immediately cast state ( cast state).

  Parts made from the above-mentioned aluminum die-cast alloys are subsequently subjected to a period between 120 ° C. and 260 ° C., in particular at 200-240 ° C. for less than 180 minutes, for example about 20 minutes to 90 minutes, in particular 30 minutes to 60 minutes. , Subjected to stabilization annealing.

After the heat treatment, the yield point Rp _0.2 of the cast part is, for example, between about 110 and 120 MPa, in particular between 115 and 118 MPa.

(Second embodiment)
According to the second embodiment,
7.8-8.2 wt% silicon,
0.5-0.6% by weight manganese,
0.15 to 0.2 weight percent iron;
0.08-0.12 wt% magnesium;
0.04-0.08 wt% titanium,
14 × 10 ⁻³ to 18 × 10 ⁻³ wt% strontium (140 to 180 ppm)
An aluminum die-casting alloy for cast parts made of aluminum, containing the following alloy elements, and the balance containing impurities produced by a manufacturing method of individually up to 0.05% by weight and up to 0.2% by weight as a whole Is used.

Die-cast aluminum alloy used in this case, a state-cast, elongation at break _{A 5} is 10% or more, a yield point _{Rp 0.2} is less than 120 MPa.

  Subsequently, each cast part is in an as-cast state, for example at a temperature of about 120-260 ° C., in particular at a temperature of 200-240 ° C., for a period shorter than 180 minutes, for example about 20 minutes to about 90 minutes, in particular A stabilization annealing treatment is performed within a period of about 30 minutes to about 60 minutes.

Cast component then is elongation at break _{A 5} of 7% or more, a yield point _{Rp 0.2,} for example about 125～135MPa, in particular 129～133MPa.

(Third embodiment)
According to the third embodiment, for each cast part,
7.8-8.2 wt% silicon,
0.5-0.6% by weight manganese,
0.15 to 0.2 weight percent iron;
0.12-0.16 wt% magnesium;
0.04-0.08 wt% titanium,
14 × 10 ⁻³ to 18 × 10 ⁻³ wt% strontium (140 to 180 ppm)
An aluminum die-cast alloy made of aluminum is used, which contains the above-described alloy elements, and the balance contains impurities generated by a manufacturing method of up to 0.05% by weight and up to 0.2% by weight as a whole.

Castings produced using the above-described die-cast aluminum alloy, the pre-cast, namely heat treatment, elongation at break _{A 5} is 10% or more, a yield point _{Rp 0.2} is less than 120 MPa.

  The individual cast parts are then subjected to a stabilization annealing process carried out at a temperature in the range of 120-260 ° C, in particular 200-240 ° C. The stabilization annealing process is performed over a period of up to 180 minutes, in this case for example over a period of about 20 to 90 minutes, in particular 30 to 60 minutes.

This fashion in the heat-treated cast component, after stabilization annealing is elongation at break _{A 5} of 7% or more, the range between the yield point _{Rp 0.2} is 135MPa and 150 MPa, in particular in the range of 141~148MPa It is.

(Fourth embodiment)
According to the fourth embodiment,
7.8-8.2 wt% silicon,
0.5-0.6% by weight manganese,
0.15 to 0.2 weight percent iron;
0.16-0.2 wt% magnesium;
0.04-0.08 wt% titanium,
14 × 10 ⁻³ to 18 × 10 ⁻³ wt% strontium (140 to 180 ppm)
An aluminum die-cast alloy made of aluminum is used, which contains the above-described alloy elements, and the balance contains impurities generated by a manufacturing method of up to 0.05% by weight and up to 0.2% by weight as a whole.

Again in this case, the cast part manufactured using the above described die-cast aluminum alloy, cast, that is, before the heat treatment, and elongation at break A ₅ of 7% or more, a yield point Rp _0.2 is less than 120MPa is there.

  The cast part is then subjected to a stabilizing anneal at a temperature of 120-260 ° C, in particular between 200 ° C and 240 ° C. Thus, the stabilization annealing process is performed within a period that lasts up to 180 minutes, particularly between 20 and 90 minutes, especially between 30 and 60 minutes.

Therefore, in this case, after the heat treatment, elongation at break _{A 5} is 7% or more, the range yield point _{Rp 0.2} is 145～165MPa, especially cast component is in the range of 151~161MPa is produced.

(Overview)
Thus, as a whole, in this case, elongation at break A ₅ before the heat treatment is said cast is at least 10%, yield point Rp _0.2 is less than 120 MPa, starting from the respective cast component It is possible to produce a heat-treated cast part having an elongation at break A ₅ of 7% or more and a yield point Rp _0.2 of 110 MPa or more by an appropriate stabilization annealing treatment. It can be understood from ~ 4 examples.

  By adjusting the magnesium content, it can be further understood that the yield point can be adjusted to the value given according to the first to fourth embodiments, depending on the field in which the respective cast part is used. If the yield point is high, the magnesium content can be adjusted to a maximum of 0.6% by weight.

In this case, it can be understood from the first to fourth embodiments that a single-step stabilization annealing process is performed at a temperature in the range of 120 to 260 ° C., particularly in the range of 200 to 240 ° C. . Thus, in the case of all cast part samples, the shortest possible stability that ensures the necessary short-term thermal stability or long-term stability is obtained without having to excessively or significantly reduce the yield point Rp _0.2. Annealing treatment is realized.

  A single stabilization anneal of this type with a disclosed temperature range, specifically a temperature in the range below 240 ° C., is performed during the painting process, for example during the automotive paint baking process You can also Such a type of stabilizing annealing treatment at such temperatures, for example at temperatures below 240 ° C. for periods shorter than 180 minutes, in particular shorter than 60 minutes, also prevents the cast parts from being deformed and heat treatment in large quantities in a batch furnace. Has the advantage of being able to.

A particular advantage when using the cast part, for example in the field of vehicle production, the cast component is cast, i.e. the intensity is the minimum _{(Rp 0.2} is about 100 MPa) ductility maximum _{(A 5} is from about 10 14%), it can be mechanically joined, for example, riveted. The final mechanical value is set, for example, during a subsequent heat treatment that can be performed for example for about 30 minutes at about 180 ° C. during the car body painting or paint baking process.

Claims (20)

In a method for producing a cast part made of an aluminum die cast alloy, which is subjected to a heat treatment process after casting,
The cast component is in the form of cast, elongation at break _{A 5} of 10% or more, a yield point _{Rp 0.2} is less than 120 MPa, and the stabilization annealing is carried out at a temperature of 120 to 260 ° C., followed by the cast components are heat treatment, elongation at break a ₅ of 7% or more, a yield point Rp _0.2 is higher 110 MPa, characterized by using an aluminum die cast alloy to the cast component, method for producing cast parts.   2. A method according to claim 1, characterized in that an aluminum die-casting alloy containing less than 8.5% by weight silicon, in particular 8.3% by weight or less, is used.   3. A method according to claim 1 or 2, characterized in that an aluminum die cast alloy containing less than 0.6% by weight, in particular 0.02 to 0.3% by weight of magnesium is used. 4 to 8.2 weight percent silicon,
0.5-0.6% by weight manganese,
0.15 to 0.2 weight percent iron;
0.04 to 0.2 weight percent magnesium;
0.04 to 0.08 wt% titanium,
14 × 10 ⁻³ to 18 × 10 ⁻³ wt% strontium (140 to 180 ppm)
Containing alloying elements
The balance is characterized by using an aluminum die-casting alloy formed of aluminum containing impurities generated by the above-described manufacturing method up to 0.05% by weight individually and up to 0.2% by weight as a whole, The method as described in any one of Claims 1-3. The cast component is in the form of cast, elongation at break A ₅ 11% or more, particularly characterized by using an aluminum die cast alloy consisting of 12% or more on the cast part, any of claims 1 to 4 one The method according to item. The cast component is cast in a release state, which comprises using the aluminum die-casting alloy elongation at break A ₅ is 13% or more in the cast component, the method according to any one of claims 1 to 5 . 7. The aluminum die casting alloy having a yield point Rp _0.2 of 105 MPa or more, particularly 110 MPa or more in the as-cast state, is used for the cast part. The method according to item. The aluminum die casting alloy having a yield point Rp _0.2 of 115 MPa or more, particularly 120 MPa or more in the as-cast state, is used for the cast part. The method according to item.   The method according to claim 1, wherein the stabilization annealing process is performed at a temperature of 200 to 240 ° C. The yield point Rp _{0.2 of the} cast part that has been subjected to the stabilization annealing treatment and then heat-treated is 115 MPa or more and 165 MPa or less, particularly 125 MPa or more and 220 MPa or less. The method according to claim 1. In cast parts made of aluminum die-casting alloy and subjected to heat treatment process after casting,
The cast component is in the form of cast, elongation at break _{A 5} of 10% or more, a yield point _{Rp 0.2} is less than 120 MPa, and subjected to a stabilization anneal at a temperature of 120 to 260 ° C., subsequent heat treatment has been the cast part, elongation at break _{a 5} of 7% or more, a yield point _{Rp 0.2} is higher 110 MPa, characterized in that it is formed by die-cast aluminum alloy, cast component.   Cast part according to claim 11, characterized in that the aluminum die cast alloy of the cast part contains less than 8.5% by weight of silicon, in particular 8.3% by weight or less.   Cast part according to claim 11 or 12, characterized in that the aluminum die casting alloy of the cast part contains less than 0.6% by weight of magnesium, in particular 0.02-0.3% by weight of magnesium. The aluminum die casting alloy of the cast part is
4 to 8.2 weight percent silicon,
0.5-0.6% by weight manganese,
0.15 to 0.2 weight percent iron;
0.04 to 0.2 weight percent magnesium;
0.04-0.08 wt% titanium,
14 × 10 ⁻³ to 18 × 10 ⁻³ wt% strontium (140 to 180 ppm)
Containing alloying elements
14. The balance of claim 11-13, characterized in that the balance is individually made up of 0.05% by weight, the total containing up to 0.2% by weight of impurities produced by the production method. Cast parts according to any one of the above. The cast component is in the form of cast, and elongation at break A ₅ of 11% or more, and wherein the in particular 12% or more, the cast component according to any one of claims 11 to 14. The cast component is in the form of cast, characterized in that the breaking elongation A ₅ is 13% or more, the cast component according to any one of claims 11 to 15. The cast part according to any one of claims 11 to 16, wherein the cast part is in an as-cast state and has a yield point Rp _0.2 of 105 MPa or more, particularly 110 MPa or more. 18. The cast part according to claim 11, wherein a yield point Rp _{0.2 of the as-} cast part is 115 MPa or more, in particular 120 MPa or more.   The cast part according to claim 11, wherein the cast part is subjected to a stabilization annealing treatment at a temperature of 200 to 240 ° C. The cast part according to any one of claims 11 to 19, wherein the yield point Rp _{0.2 of the} heat-treated cast part is 115 MPa or more and 220 MPa or less, particularly 125 MPa or more and 165 MPa or less.