CN1264622C - Magnesium material products mfg. method - Google Patents

Abstract

In the method of producing a product of a predetermined shape from a magnesium or magnesium alloy plate by plastic working, the surface of the plate that becomes the surface side of the product after plastic working is superimposed on a product selected from aluminum, aluminum alloy, magnesium, magnesium alloy and resin The thin plate state of the material, and the manufacturing method of magnesium products subjected to plastic processing. By adopting this manufacturing method, even if the minimum R of the surface of the magnesium material product is small, for example, even if it is less than 3mm, it is possible to manufacture the specified material by plastic processing of the magnesium material plate without producing cracks on the product, or without producing scratches on the surface of the product. Shaped magnesium products, high-quality magnesium products can be manufactured cheaply.

Description

Magnesium product and manufacturing method thereof

technical field

The present invention relates to the manufacturing method of magnesium or magnesium alloy (the two are collectively referred to as magnesium material in this specification) product, more specifically, the present invention relates to even if the minimum R (bend radius) of the surface of magnesium material product is small, For example, even if it is less than 3 mm, no cracks or scratches are generated on the product surface, and a magnesium material product of a predetermined shape can be produced by plastic working of a magnesium material plate.

Background technique

When iron alloys or aluminum alloys are formed by plastic processing such as stamping processing, forging processing, and rolling processing such as deep drawing processing, iron alloys or aluminum alloys made of materials with excellent plastic workability are produced, and these alloys are plastically processed, or in Plastic working is carried out in a state where the iron alloy or aluminum alloy is cooled (low-temperature working) or heated (warm working or hot working) to improve plastic workability, or a combination of both is performed. Furthermore, when flaws generated on the surface of the plastically processed product become a problem, a hardened layer is formed on the surface of the material before plastic working to avoid the occurrence of flaws.

However, with regard to the plastic working of magnesium materials, when the plastic working method of iron alloy or aluminum alloy is used as it is, cracks or scratches may occur on the magnesium product surface, so not only forming is difficult, but also must be processed. Introducing an inspection process or a repair process for damage increases the cost. In addition, if a hardened layer is formed on the surface of the magnesium material before plastic working, the characteristics of the magnesium material as an original lightweight material will be lost. Furthermore, the addition of new additive elements that are difficult to separate at the time of recycling may have a bad influence on the global environment.

Contents of the invention

The present invention has been made in view of such problems in the prior art, and the present invention aims to provide a production method in which even if the minimum R (bend radius) on the surface of a magnesium product is small, for example, even if it is 3mm or less, A manufacturing method in which a magnesium material product of a predetermined shape can be produced by plastic working of a magnesium material plate without generating cracks on the product or producing a flaw on the surface of the product.

The inventors of the present invention conducted various studies in order to achieve the above-mentioned problems, and as a result, found that, in the method of producing a product of a predetermined shape from a magnesium plate by plastic working, if the surface side of the product is formed after plastic working, The surface of the plate is plastic-worked in a state where a thin plate having plastic working properties similar to that of the plate is overlapped. Although scratches are generated on the surface of the thin plate, the magnesium plate and the thin plate have similar plastic working properties, so there is no difference between them. Scratches are generated, and therefore, by removing the thin plate that has scratches, it is possible to manufacture a product without cracks on the product and without scratches on the surface of the product, thereby completing the present invention.

That is, the manufacturing method of the magnesium product of the present invention is a method of manufacturing a magnesium or magnesium alloy plate into a product of a predetermined shape by plastic working, and is characterized in that the surface of the plate that becomes the surface side of the product after plastic working is superimposed Plastic working is performed in the state of a thin plate made of a material selected from aluminum, aluminum alloy, magnesium, magnesium alloy, and resin.

Description of drawings

FIG. 1A shows a male die used in Examples and Comparative Examples, and FIG. 1B shows a female die used in Examples and Comparative Examples.

Detailed ways

Hereinafter, the plastic working method, the plastic working conditions, the type of magnesium alloy, etc. in the manufacturing method of the magnesium material product of this invention are demonstrated in detail.

In the production method of the present invention, as the plastic working method that can be used, as long as it is a method that can plastically work the sheet material, any method is acceptable, for example, press working methods such as deep drawing methods, forging processing method, rolling method.

In the manufacturing method of the present invention, the material of the thin plates superimposed on the surface of the plate during the plastic working of the magnesium plate theoretically has plastic working characteristics similar to the plastic working characteristics of the magnesium plate. Under plastic processing conditions (temperature, pressure), if it is a non-reactive, non-crimping, and non-alloying material, no matter what the material is, there are no special restrictions, but it is better to use aluminum, aluminum alloy, For thin plates made of materials such as magnesium, magnesium alloy, and resin, it is preferable to use thin plates made of the same material as the magnesium plate. Of course, when using a resin sheet, the temperature of the plastic processing tool and the temperature of the magnesium sheet should be limited due to its heat resistance.

In the production method of the present invention, the plastic working may be carried out in a state where the above-mentioned thin plate is superimposed on both sides of the magnesium material plate to be plastic-worked, or the above-mentioned thin plate may be superimposed only on the surface of the plate that becomes the product surface side after plastic working. Plastic working is performed in the thin plate state, but the latter is practical and sufficient. And this overlapping, the magnesium plate and the thin plate can form a state of separate contact, or can also be bonded with an adhesive with weak cohesive force.

In the manufacturing method of the present invention, the thickness of the magnesium plate to be plastically worked is not particularly limited if it is a thickness that can be plastically worked. Smooth, etc., preferably less than 5.0mm. Accordingly, the thickness of the thin plate is preferably 1.5 mm or less, which is thinner than that of the magnesium plate.

In the production method of the present invention, there is no particular limitation on the material of the working tool used for plastic working. As a processing tool, a processing tool made of an iron-based alloy is generally used, but when a processing tool made of an iron-based alloy is used for plastic processing of a magnesium sheet, generally, seizure often occurs. However, according to the production method of the present invention, plastic working can be properly performed even if a working tool made of an iron-based alloy is used.

In the manufacturing method of the present invention, in order to improve the plastic working of the magnesium material plate when carrying out plastic working, generally speaking, preferably make the temperature of the plastic working tool reach 100～500 ℃, the temperature of the magnesium material plate and the temperature of the thin plate Respectively reach 80 ~ 450 ℃ (the temperature of the magnesium plate and the temperature of the thin plate can be the same or different), and carry out plastic processing. However, it is better to be different within this range, and the preferable temperature range differs depending on the material of the magnesium plate and the material of the thin plate, and especially the optimal temperature range also differs. The preferred temperature range is a level that can be easily determined by professionals according to the material of the magnesium plate, the material of the thin plate, and the like.

In the manufacturing method of the present invention, the scratches produced by the processing tool are attached to the surface of the thin plate, but the magnesium plate and the thin plate have similar plastic working characteristics, so no scratches are generated between them, therefore, thereafter, by removing A thin plate with scratches can produce products without cracks on the product and without scratches on the surface of the product. Therefore, even if the minimum R (bending radius) on the surface of the magnesium product is small, for example, even if it is less than 3mm, there will be no scratches on the product. Cracks occur, or in the state where no scratches occur on the surface of the product, the plastic processing of the magnesium plate is used to manufacture the magnesium product of the specified shape. After the plastic working, the scratched sheet is removed from the surface of the magnesium product, recovered, regenerated into a sheet of desired thickness, and reused.

The manufacturing method of the present invention is applicable to all kinds of magnesium and magnesium alloys. However, even if the minimum R (bending radius) of the surface of the magnesium product is small, for example, even if it is less than 3mm, in order not to cause cracks on the product or scratches on the surface of the product, it can be manufactured by plastic processing of the magnesium plate Magnesium products with a predetermined shape are desired to have high plastic workability.

What kind of magnesium material contains 35% by mass or less of aluminum, and contains 5% by mass or less of zinc, 5% by mass or less of manganese, 5% by mass or less of rare earth metals, 5% by mass or less of silicon, and 5% by mass? Magnesium alloys in which at least one of the following silvers is at least 10% by mass in total and the balance is basically magnesium, specifically AZ31, AZ61, AZ80 and the like.

In addition, zinc containing 5 mass % or less, silver 5 mass % or less, rare earth metals 5 mass % or less, zirconium 1 mass % or less, manganese 1 mass % or less, calcium 5 mass % or less, 5 Magnesium alloys in which silicon is less than 5 mass % and yttrium is less than 5 mass %, the total of which is less than 10 mass %, and the balance is basically magnesium. Specifically, there are ZK60, ZE10 and the like.

In the production method of the present invention, in order to improve formability and plastic workability, it is preferable that the crystal grain diameter in the above-mentioned magnesium alloy is 50 μm or less. When the grain diameter in the magnesium alloy is 20 μm or less, the magnesium alloy exhibits superplasticity, so superplastic working becomes possible in this case.

Furthermore, it contains 7 to 16% by mass of lithium, and contains 5% by mass or less of aluminum, 5% by mass or less of zinc, 5% by mass or less of calcium, 5% by mass or less of rare earth metals, and 5% by mass or less of silicon At least one of these is a magnesium alloy in which the total amount is 10% by mass or less, and the balance is basically magnesium, specifically Mg-9.5Li-1Zn and the like. Even in these lithium-containing magnesium alloys, it is desirable that the crystal grain diameter be small. However, the crystal structure of these lithium-containing magnesium alloys forms bcc (body-centered cubic crystal) with excellent plastic workability or hcp (hexagonal close-packed crystal) and bcc dual-phase structure with poor plastic workability. Since the microstructure is different from that of other magnesium alloys, the crystal grain size does not necessarily become a problem in magnesium alloys containing lithium like in other magnesium alloys.

By adopting the manufacturing method of the magnesium material product of the present invention, even if the minimum R (bending radius) of the surface of the magnesium material product is small, for example, even if it is 3mm or less, no cracks will be generated on the product, or no scratches will be generated on the surface of the product. Next, the plastic processing of the magnesium material plate is used to manufacture the magnesium material product of the predetermined shape, and the high-quality magnesium material product can be manufactured at low cost.

Hereinafter, the present invention will be specifically described based on Examples and Comparative Examples.

Examples 1-18 and Comparative Examples 1-5

In the Amsra universal test device, the punch support table containing the cartridge heater and the die support table containing the cartridge heater are installed inside, and the shape shown in Figure 1A is installed on the punch support table. The convex mold, the concave mold of the shape shown in Figure 1B is installed on the convex mold support table. The shape of the punch is 77mm×77mm, the height is 10mm, the (circle radius) R of the R part ① is 1.0mm, 1.5mm, 3.0mm or 5.0mm, the shape of the die is 80mm×80mm, and the depth is 10mm. R1.5 and R3 in FIG. 1A and FIG. 1B indicate that the respective (circle radius) R is 1.5mm and 3mm. The shape of the punch used in the deep drawing of a magnesium plate with a thickness of 4.5mm is 77mm×77mm, the height is 15mm, the R of the R part ① (circle radius) R is 3.0mm, the shape of the die is 87mm×87mm, and the depth 15mm.

Use material, grain diameter (average value), thickness as shown in Table 1, the size is 120mm * 120mm magnesium plate, material, thickness as shown in Table 1 is the size of 120mm * 120mm thin plate, as shown in Table 1 Material, R part ① (circle radius) R is the punch and die of the above value, the magnesium plate and the sheet are overlapped, and the sheet is placed in contact with the die, and the temperature of the magnesium plate, sheet, punch, and die is The temperature was adjusted to the temperature shown in Table 1, and deep drawing was performed at a forming speed of 5 mm/min. After forming, the thin plate was removed, and the surface of the obtained molded product in contact with the thin plate was examined for cracks and scratches, as shown in Table 1.

The meanings of the symbols in Table 1 are as follows.

AZ31＝Mg-3Al-1Zn alloy material

AZ61＝Mg-6Al-1Zn alloy material

ZK60＝Mg-6Zn-0.6Zr alloy material

LZ101＝Mg-9.5Li-1Zn alloy material

A2024＝Al-4.4Cu-1.5Mg-0.6Mn alloy material

S45C = carbon steel for machine structures according to JIS G 4051

SKD8 = Alloy tool steel steel according to JIS G 4404

Table 1 Magnesium sheet sheet punch die R part ① value With or without cracks With or without scratches material Grain diameter thickness temperature material thickness temperature material temperature Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Example 10 Example 11 Example 12 Example 13 Example 14 Example 15 Example 16 Example 17 Example 18 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 AZ31AZ31AZ31AZ31AZ31AZ31AZ31AZ61AZ61AZ61ZK60LZ101LZ101LZ101LZ101AZ31AZ31AZ31AZ31AZ31AZ31AZ61LZ101 15μm15μm18μm18μm23μm32μm15μm20μm25μm20μm35μm----15μm15μm18μm15μm15μm18μm20μm- 0.5mm0.5mm1mm1mm2.5mm4.5mm0.5mm0.7mm1.5mm0.7mm2mm0.6mm0.6mm1mm0.6mm0.5mm0.5mm1mm0.5mm0.5mm1mm0.7mm0.6mm 300°C 400°C 300°C 400°C 400°C 400°C 350°C 400°C 400°C 400°C 400°C 200°C 100°C 100°C 100°C 300°C 400°C 300°C 400°C AZ31AZ31AZ31AZ31AZ31AZ31A2024AZ31AZ31A2024ZK60LZ101LZ101LZ101 acrylic plate AZ31AZ31AZ31 0.5mm0.5mm0.5mm0.5mm0.5mm0.5mm0.5mm0.5mm0.5mm0.5mm0.5mm0.6mm0.6mm0.6mm0.5mm0.5mm0.5mm0.5mm do not use do not use do not use do not use 300℃400℃300℃400℃400℃400℃350℃400℃400℃400℃400℃200℃100℃100℃100℃300℃400℃300℃ S45CS45CS45CS45CS45CS45CS45CS45CS45CS45CS45CS45CS45CS45CS45CSKD8SKD8SKD8S45CS45CS45CS45CS45CS45C 300°C 400°C 300°C 400°C 400°C 400°C 350°C 400°C 400°C 400°C 450°C 200°C 100°C 100°C 100°C 300°C 400°C 300°C 400°C 3mm1.5mm3mm1mm3mm3mm3mm3mm3mm3mm3mm3mm3mm3mm3mm3mm1.5mm3mm1.5mm5mm5mm3mm3mm no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no

Claims (12)

1. utilize plastic working magnesium plate or magnesium alloy plate to be made the method for the goods of regulation shape, it is characterized in that, with on the surface of this plate that becomes the product surface side after the plastic working overlapping be selected from aluminium, aluminium alloy, magnesium, magnesium alloy and resin material, thickness is the state of the thin plate below the 1.5mm, carries out plastic working.

2. the described manufacture method of claim 1 is characterized in that, the thickness of magnesium plate or magnesium alloy plate is below the 5.0mm, and the material of plastic working instrument is an iron-based alloy.

3. the described manufacture method of claim 1 is characterized in that, reaches 100～500 ℃ in the temperature of plastic working instrument, and the temperature of magnesium plate or magnesium alloy plate and the temperature of thin plate reach carries out plastic working under 80～450 ℃.

4. the described manufacture method of claim 1, it is characterized in that, to contain the following aluminium of 35 quality %, contain below the total 10 quality % at least a in zinc, the manganese below the 5 quality %, the rare earth metal below the 5 quality %, the silicon below the 5 quality % and the silver below the 5 quality % that is selected from below the 5 quality %, surplus is that the magnesium alloy plate of magnesium carries out plastic working basically.

5. the described manufacture method of claim 1, it is characterized in that, to contain and be selected from below the total 10 quality % at least a in the following yttrium of the following zinc of 5 quality %, 5 quality % following silver, 5 quality % following rare earth metal, 1 quality % following zirconium, 1 quality % following manganese, 5 quality % following calcium, 5 quality % following silicon, 5 quality %, surplus is that the magnesium alloy plate of magnesium carries out plastic working basically.

6. the described manufacture method of claim 4 is characterized in that, the crystal grain diameter in the magnesium alloy is below the 50 μ m.

7. the described manufacture method of claim 5 is characterized in that, the crystal grain diameter in the magnesium alloy is below the 50 μ m.

8. the described manufacture method of claim 1, it is characterized in that, the lithium that will contain 7～16 quality %, contain below the total 10 quality % at least a in aluminium, the zinc below the 5 quality %, the calcium below the 5 quality %, the rare earth metal below the 5 quality % and the silicon below the 5 quality % that is selected from below the 5 quality %, surplus is that the magnesium alloy plate of magnesium carries out plastic working basically.

9. the surface does not have crackle or abrasive magnesium material products, it is characterized in that, can utilize the described manufacture method of claim 1 to make.

10. the surface does not have crackle or abrasive magnesium material products, it is characterized in that, can utilize the described manufacture method of claim 4 to make.

11. the surface does not have crackle or abrasive magnesium material products, it is characterized in that, can utilize the described manufacture method of claim 5 to make.

12. the surface does not have crackle or abrasive magnesium material products, it is characterized in that, can utilize the described manufacture method of claim 8 to make.

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