JP2003105364A - Lubricant for plastic working of magnesium alloy or aluminum alloy, and working method using the lubricant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubricant for plastic working having excellent biodegradability and suitable for the working of a magnesium alloy or the like, and further to provide a method of the plastic working. SOLUTION: This lubricant for the plastic working of the magnesium alloy or an aluminum alloy contains a biodegradable oil and fat as an essential component. The working method of the magnesium alloy or the aluminum alloy is characterized in that the magnesium alloy or the aluminum alloy is coated with the composition, and the coated product is subjected to cold press working.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a plastic working oil for magnesium alloys or aluminum alloys, a working method using the working oil, and a processed product obtained.

[0002]

2. Description of the Related Art Magnesium alloy is a relatively new metal material, and is replaced by a plastic material that is difficult to recycle due to the enactment of the Recycling Law, and the casing of mobile phones, notebook personal computers, etc. that utilizes the light weight of magnesium alloy. It is a material whose usage range is increasing as the material of the body part.

Magnesium, which is the main component of the magnesium alloy, belongs to alkaline earth metals and is known as a highly reactive metal. When magnesium is used as an alloy, it has characteristics such as a low elongation rate of the material, and therefore has a drawback that plastic working, particularly cold working performance is low.

Therefore, as a conventional processing technique, a base material is molded by a die-casting method or a thixomolding method, and a mineral oil is used as a base oil in an after-treatment step to add additives (chlorine-based, sulfur-based, oiliness improver, stabilizer The mainstream is cutting and grinding, using a water-insoluble processing oil that contains a mixture of agents.

Die casting is a method in which a material is heated into a liquid state, poured into a mold and cooled to obtain a metal block along the mold, and has the following drawbacks. That is, since it is heated once, the total processing cost of the molded product increases.
Since the raw material is heated to a high temperature, there is a high risk of work; when molding a thin material, the liquid flow (fluidity of the molten metal) deteriorates and it is difficult to obtain the desired shape; Occurs, and the performance as a material deteriorates (generally referred to as "su"). This phenomenon is particularly noticeable for magnesium alloys because of the high cooling rate; melted in the gap between the molds for casting. "Burr" when metal flows in and cools
Since it is necessary to remove burrs, dust explosion accidents are more likely to occur especially in the case of magnesium alloys; normally used mold release agents are difficult to completely remove even by etching. The residual release agent adversely affects coating such as corrosion resistant coating; the etching for removing the release agent reduces the dimensional accuracy; and the thicker wall causes warping due to internal stress. In addition, the thixomolding method also has drawbacks such as adverse effects of using a release agent, short life of the mold, and warping due to internal stress when the wall thickness increases.

With respect to the processing oil used for cutting and grinding in the subsequent process and for plastic working, since magnesium alloy is a difficult-to-process material, chlorine-based compounds have been added as additives to conventional processing oils. There is. However, it is known that the chlorine-based compound is highly likely to generate dioxin, which is an environmental pollutant when incinerated, and the Japanese Industrial Standard (JIS) of cutting oil was also revised at the end of 2000, and the chlorine-based standard was abolished. Has been done. In addition, since the conventional processing oil uses mineral oil, when it is discarded or discharged into the environment, its components are not easily decomposed, and there is a possibility that it may lead to environmental damage.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a plastic working oil and a plastic working method which are excellent in biodegradability and suitable for working magnesium alloys and the like.

[0008]

That is, the present invention provides the invention according to the following items. Item 1. A plastic working oil composition for a magnesium alloy or an aluminum alloy, which comprises a biodegradable fat as a main component. Item 2 The composition according to Item 1, which comprises (A) biodegradable fat and oil, (B) rust preventive / lubricant, and (C) extreme pressure additive. Item 3 (A) The biodegradable oil and fat is at least one of vegetable oil, animal oil and synthetic ester, and hardened oils and fats thereof, and (B) the rust preventive / lubricant is an anionic surfactant and oxidized paraffin. Item 2. The composition according to Item 1, which is at least one and the (C) extreme pressure additive is at least one of (C ′) sulfur-based fats and oils, sulfur-based synthetic polyolefin, and (C ″) phosphorus-based compound. Item 4 (A) The composition according to Item 1, which comprises 50% by weight or more of the biodegradable fat or oil based on the total weight of the composition. Item 5 When the total amount of the composition is 100% by weight, the content of the component (A) is 50 to 90% by weight, the content of the component (B) is 2 to 30% by weight, and the component (C ') is Content of 2 to 30
% By weight, the content of the (C ″) component is 2 to 30% by weight, and the total content of the (B) component, the (C ′) component and the (C ″) component is 10 to 50% by weight. Item 4. The composition according to Item 3, which is Item 6 The composition according to Item 2, further comprising (D) an organozinc compound and (E) an organomolybdenum compound. Item 7 The composition according to Item 1, which has a biodegradability of 60% or more in a test according to CEC (European Standards Advisory Committee) standard L-33-T-82. Item 8 In addition to magnesium alloy or aluminum alloy, Item 1
A method for working a magnesium alloy or an aluminum alloy, which comprises applying the composition according to claim 1 and then performing cold press working. Item 9 A pressed product of a magnesium alloy having a specific gravity of 1.7 or less. Item 10: A mobile information terminal, the housing of which is the pressed product according to Item 9. Item 10: A mobile information terminal, the housing of which comprises the pressed product according to Claim 9. Item 11: A notebook computer, the housing of which is the pressed product according to claim 9. Item 12: A video device, wherein the casing is made of the pressed product according to Claim 9. Item 13. A robot, wherein at least one of the casing and the internal mechanical component is made of the pressed product according to Claim 9. Item 14: An information recording and / or reproducing apparatus in which the housing is made of the pressed product according to claim 9. Item 15 A game machine in which the internal mechanical component is the pressed product according to Claim 9.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.

The composition of the present invention comprises (A) biodegradable fat and oil, (B)
Contains rust preventive / lubricant and (C) extreme pressure additive. Hereinafter, each component will be described.

(A) Biodegradable Fats and Oils The biodegradable fats and oils as the main component of the present invention are CEC (European Standards Advisory Committee) standard L-33-T, which is currently published as a biodegradability evaluation test. Degradability of 60 by -82 test
% Or more, preferably about 80% or more.
If the degradability by the above test is 67% or more, it is officially recognized as a biodegradable oil in CEC, and therefore the degradability of the composition of the present invention is 6 by the test according to the above standard.
It is more preferably at least 7%.

As the fats and oils as the component (A) of the present invention, those containing glycerin esters of fatty acids as a main component can be used, and vegetable fats and oils, animal fats and oils and synthetic esters,
Moreover, these hardened oils and fats can be used.

The fats and oils in the present invention refer to those containing glycerin esters of fatty acids as a main component, and vegetable fats and oils,
Animal fats, synthetic fats and hardened fats and oils thereof are incorporated.

Examples of vegetable oils and fats include palm oil, palm oil, olive oil, soybean oil, rapeseed oil, cottonseed oil, linseed oil, sunflower oil, safflower oil, corn oil, sesame oil, castor oil and the like.

Examples of animal oils include beef tallow, lard, bone oil, sardine oil, mackerel oil, shark liver oil and the like.

Examples of the synthetic ester include esters synthesized from saturated or unsaturated fatty acids and monohydric and polyhydric alcohols. The carbon number of the fatty acid is not particularly limited, but is usually preferably about 8-18.

As the synthetic ester, synthetic fats and oils are particularly preferable, and examples thereof include glycerin ester derivatives such as monoglyceride, diglyceride and triglyceride synthesized from saturated or unsaturated fatty acid and glycerin. The carbon number of the fatty acid is not particularly limited, but is usually preferably about 8-18.

Examples of hardened fats and oils include those obtained by hydrogenating the above-mentioned vegetable fats, animal fats and oils and synthetic fats and oils to reduce all or some of the unsaturated bonds in the alkyl chain to saturated bonds.

(B) Anticorrosion / Lubricant The component (B) can be selected from known rust / lubrication agents such as anionic surfactants and oxidized paraffin without any particular limitation.

Examples of the anionic surfactant include petroleum sulfonate and synthetic sulfonate.

Examples of the petroleum sulfonate (B) include alkali metal salts or alkaline earth metal salts of alkylbenzene sulfonic acid, alkali metal salts or alkaline earth metal salts of dinaphthylbenzene sulfonic acid, and the like. The alkyl group of alkylbenzenesulfonic acid is not particularly limited, but an alkyl group having about 8 to 18 carbon atoms is preferable, and an alkyl group having about 10 to 14 carbon atoms is preferable. Examples of the alkali metal include sodium and potassium. Examples of alkaline earth metals include calcium, barium and magnesium. More specific examples include sodium sulfonate and calcium sulfonate.

Examples of synthetic sulfonates include alkali metal salts and alkaline earth metal salts of alkylbenzene sulfonic acid, dialkylnaphthalene sulfonic acid, alkali metal salts thereof, and alkaline earth metal salts thereof. As the alkali metal salt or alkaline earth metal salt of alkylbenzene sulfonic acid, those described above as examples of petroleum sulfonate can be used. Examples of the dialkylnaphthalene sulfonic acid, its alkali metal salt, alkaline earth metal salt, and the like include those having an alkyl group having about 8 to 18 carbon atoms. Examples of the alkali metal include sodium and potassium, and examples of the alkaline earth metal include Calcium, barium, magnesium etc. can be illustrated. As the alkali metal, calcium is more preferable. More specifically, dinonylnaphthalene sulfonic acid and its salt are mentioned.

The oxidized paraffin has 20 to 4 carbon atoms.
The paraffinic hydrocarbon of about 0 may be oxidized to add a polar group such as a carboxyl group.

(C) Extreme Pressure Additive The extreme pressure additive can be used without particular limitation as long as it has been conventionally used in plastic working oils, and examples thereof include sulfur-based fats and oils and sulfur-based synthetic polyolefins. , Phosphorus compounds can be used.

(C ') Sulfur-based fats and oils and sulfur-based synthetic polyolefins Sulfur-based fats and oils and sulfur-based synthetic polyolefins have a sulfur atom in the molecule and are dissolved or uniformly dispersed in the component (A) to obtain extreme pressure properties. As long as it can exhibit excellent lubricity, it is not particularly limited and can be appropriately selected from conventionally used sulfur-based extreme pressure additives. As the sulfurized fats and oils, the above-mentioned fats and oils as exemplified for the component (A) may be sulfurized by a conventional method, and examples thereof include sulfurized rapeseed oil, sulfurized castor oil, and sulfurized soybean oil. The sulfur content is not particularly limited, but is preferably about 8 to 15% by weight.

Examples of the sulfurized polyolefin include the following general formula (I) R ₁ -Sx -R ₂ ... (I) (wherein R ₁ is an alkenyl group having 2 to 15 carbon atoms, and R ₂ is a carbon atom). Represents an alkyl group or an alkenyl group of the number 2 to 15, x
Represents an integer of 1 to 8. The polymer of the compound represented by these can be mentioned. The compound of formula (I) has 2 to 2 carbon atoms.
It is obtained by reacting 15 olefins or 2- to 4-mer thereof with a sulfurizing agent such as sulfur or sulfur chloride. Preferred examples of the olefin include propylene, isobutene and diisobutene. Sulfurized polyolefin is
It can be obtained by polymerizing the compound of formula (I) according to a conventional method so that the degree of polymerization is about 2 to 50.

(C ′) Phosphorus Compound The phosphorus compound is not particularly limited and may be appropriately selected from conventionally used phosphorus extreme pressure additives, for example, trioctyl phosphate, tricresyl phosphate, trioleyl. Examples thereof include phosphoric acid esters such as phosphate (having an alkyl group having about 8 to 18 carbon atoms), dioctyl acid phosphate, dilauryl acid phosphate, and other acidic phosphoric acid esters (having about 6 to 12 carbon atoms in the starting alcohol).

In addition to the above-mentioned components (A) to (C), the composition of the present invention may optionally contain (D) an organozinc compound or (E) an organomolybdenum compound. By adding these ingredients, the processing speed can be increased, and
It is preferable because the seizure performance during processing is improved.

The (D) organozinc compound can be selected without any particular limitation as long as it is a compound usually used as an additive for plastic working oils. Examples thereof include zinc dithiophosphate and dialkyldithiozinc.

The (E) organomolybdenum-based compound can be selected without particular limitation as long as it is a compound usually used as an additive for plastic working oils. For example, molybdenum dithiocarbamate and the like can be mentioned.

The blending amount of each component in the composition of the present invention is not particularly limited as long as it can be utilized as a plastic working oil, particularly a press working oil, and can be set appropriately. For example, the blending amount of each component is such that the viscosity is such that it can be used as a plastic working oil, particularly as a press working oil, for example, a kinematic viscosity of about 5 to 10000 (mm ² / S, 40 ° C.), preferably 22 to 200 ( mm ² / S, 40 ° C).

More specifically, the component (A) is 50% by weight of the total weight of the composition when the total amount of the composition is 100% by weight.
It is preferably contained in the above amount, more preferably in an amount of about 60% by weight or more. A more preferable composition has a content of the component (A) of 50 to 9 when the total amount of the composition is 100% by weight.
0% by weight, the content of component (B) is about 2 to 30% by weight, the content of component (C ') is about 2 to 30% by weight, the content of component (C'') is The amount is about 2 to 30% by weight, and the total amount of the component (B), the component (C ') and the component (C'') is 10 to 10%.
It is preferably about 50% by weight. As a more preferable range, when the total amount of the composition is 100% by weight,
When the content of the component (A) is about 75 to 85% by weight, the content of the component (B) is about 5 to 10% by weight, and the content of the component (C ') is about 10 to 15% by weight. Yes, the content of the (C '') component is about 5 to 10% by weight, and the total amount of the (B) component, the (C ') component and the (C'') component is about 15 to 25% by weight. Is preferred.

When the component (D) and the component (E) are contained,
When the content of the component (A) is about 50 to 90% by weight, the content of the component (B) is about 2 to 30% by weight, and the content of the component (C ') is about 2 to 30% by weight. Yes, the content of the (C '') component is about 2 to 30% by weight, and the content of the (D) component is 2 to
It is about 30% by weight, the content of the (E) component is about 2 to 30% by weight, and the (B) component, the (C ') component, the (C'') component, and the (D)
The total amount of the component and the component (E) is preferably about 10 to 50% by weight.

In the plastic working oil composition of the present invention, in addition to the above-mentioned components, as long as the intended purpose of the present invention is not impaired, the components usually contained in the plastic working oil, particularly the press oil composition, for example,
Antioxidants, defoamers and the like can be added.

The plastic working oil composition of the present invention is suitable for plastic working of magnesium alloys. Moreover, since the plastic working oil of a magnesium alloy can usually be used also as the plastic working oil of an aluminum alloy, the plastic working oil composition of the present invention can also be used as a plastic working oil of an aluminum alloy.

The plastic working oil composition of the present invention can be used as a working oil for plastic working methods such as pressing, drawing, punching, drawing, bending, extruding, overhanging and burring. Among these processing methods, it can be preferably used for a press processing method such as a cold press processing method, a hot press processing method and a warm press processing method. Since the press processing does not require a mold release agent, the obtained molded product has excellent coatability, and etching for removing the mold release agent is not required, so that the dimensional accuracy is high. Furthermore, press working has higher productivity and lower equipment costs than die casting and thixomolding.
There is no risk of "burrs" or "burrs" during manufacturing. Among these press processing methods, it is not necessary to use a processing machine (press machine) with a special mold or a special mechanism, and it is not necessary to raise the temperature of the material to be processed, and the processing speed can be increased, so mass productivity is improved. The cold pressing method, which has a high temperature and is industrially excellent, is preferable.

The composition of a magnesium alloy to which cold pressing is applied is usually Li: 5 to 16%, Y, Zn, Al, Ag, Mn, Si,
At least one of Ca, Zr and lanthanoid: 6% or less, Mg: the balance. As an aluminum alloy, for example, JIS H400
Alloy numbers by 0 are 1085, 1080, 1070, 1050, 1100, 1
200, 1N00, 1N30, 2014, 2017, 2219, 2024, 3003, 320
3, 3004, 3104, 3005, 3105, 5005, 5052, 5652, 5154,
5254, 5454, 5082, 5182, 5083, 5086, 5N01, 6061, 7
075, 7N01, 8021, 8079 etc. are usually used. Among these aluminum alloys, the alloy numbers are 1050 and 50.
Those of 52 are preferably used. The shapes of these alloys are
It can be appropriately selected according to the shape of the pressed product. The alloy is usually processed in the form of a plate, but the thickness of the plate can be appropriately selected depending on the application of the pressed product, etc.
It is about 0.3 to 10 mm.

The plastic working can be carried out according to a conventional method using the plastic working oil of the present invention. For example, the cold pressing method is applied to the alloy with the working oil composition of the present invention and then 50 k.
It is possible to mold with a pressure of about g / cm ^{2 to} 5,000 kg / cm ² (4.9 MPa to 490 MPa) and a processing time of about 0.1 to 10 seconds. The coating amount of the processing oil is not particularly limited as long as it is an amount capable of processing into a desired shape and can be appropriately set, but it is usually about 0.1 to 50 mg / cm ² .
The processing oil may be applied by dropping the pressing oil on the center of the plate to be normally pressed and spreading it over the entire surface of the plate so that the amount of the pressing oil is sometimes as described above. In addition to dropping, coating can be performed by a conventional method such as spray coating or electrostatic coating.

When the plastic working oil of the present invention is used, a pressed product having a drawing ratio (blank diameter / punch diameter value) of 1.7 or more, preferably 1.8 or more can be obtained. Further, when the plastic working oil of the present invention is used, a pressed product having a thickness of 0.5 mm or less, preferably 0.4 mm or less can be obtained. Further, the alloy used for cold pressing has a low specific gravity, and for example, the specific gravity of the obtained pressed product is about 1.7 or less, preferably about 1.6 or less, more preferably 1.
It will be about 5 or less.

The shape of the molded product is not particularly limited and may be any shape according to the application.

The shaped articles can furthermore be used in the final product. For example, mobile phones, PHS, PDA (Perso
mobile information terminals such as nal Digital Assistance); notebook computers; video equipment such as digital video and digital cameras; industrial robots, entertainment robots (eg AIBO, ASIMO, Pinot (all are registered trademarks) Robots such as simulated robots;
Information recording and / or reproducing apparatus such as CD player, MD player, portable cassette disk, portable DVD; game machine [for example, home game machine such as PlayStation (registered trademark)], housing part, internal mechanical parts (for example, , Internal pickup of game machine) and the like. Further, the molded article can be used as an automobile part, an aerospace industry part (a case for an artificial satellite, a support for a paddle for a solar cell, a structural material for a space station) and the like.

[0042]

EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples below.

Example 1 Plastic Processing Oil Composition of the Present Invention Trimethylolpropane Trioleate 70% by Weight Calcium Synthetic Sulfonate 7% by Weight Sulfided Lard 15% by Weight Phosphate Ester 8% by Weight A plastic working oil composition was obtained.

Using the plastic working oil having the above composition, its moldability was evaluated under the following molding conditions. For comparison,
A commercially available plastic working oil, G3181 (manufactured by Japan Machine Oil Co., Ltd., trade name) was used as Comparative Example 1, and G3080 was used.
(Trade name, manufactured by Nippon Machine Oil Co., Ltd.) was used as Comparative Example 2.

Magnesium alloy (Li: 9%, Y: 1%, Mg: 90
LDR (Limiting Drawing Ratio)
Test The LDR test was performed according to the following conditions. Press machine used for the test: 35t crank press Mold: Single shot die set type Alloy film thickness: 0.5mm Punch diameter: 28.8mm Corner R: 0.5 Clearance: 0.5mm on one side Die size: 29.8mm Die R: 2.0R Wrinkle holding force: 90 kgf Lower spring load: 500 kgf Rotation speed: 40 rpm Processing temperature: Room temperature oil amount: 5 mg / cm ^{2 The} results are shown in Table 1.

[0046]

[Table 1]

In Table 1, the drawing ratio indicates the value of blank diameter / punch diameter.

Further, in the table, "○" indicates that the alloy could be drawn without cracking, and "X" indicates that the alloy was broken and drawing was impossible.

Usually, if the drawing ratio is 1.8 or more, the drawing process can be applied. Therefore, when the plastic working oil composition of the present invention is used, even if it is at room temperature, it has excellent plasticity against magnesium alloy. It can be seen that workability can be obtained.

Aluminum alloy (1050, H24, JIS H400
LDR test using (0) LDR test using aluminum alloy in the same manner as the above test.
The test was conducted. In Comparative Example 3, a commercially available plastic working oil G3181 (trade name, manufactured by Nippon Machine Oil Co., Ltd.) was used. The results are shown in Table 2.

[0051]

[Table 2]

Usually, if the drawing ratio is 1.8 or more, the drawing process can be applied. Therefore, when the plastic working oil composition of the present invention is used, even if it is at room temperature, it has excellent plasticity to an aluminum alloy. It can be seen that workability can be obtained.

CEC (European Standards Advisory Committee) Standard L-3
In the test by 3-T-82, the oils used in Comparative Examples 1 to 3 had a biodegradability of about 40%, but the plastic working oil compositions used in the above Examples had a biodegradability of 80%. % Or more.

[0054]

The plastic working oil composition of the present invention contains biodegradable fats and oils as a main component, and therefore has a low environmental load. Further, according to the plastic working oil of the present invention, when used as a plastic working oil of a magnesium alloy or an aluminum alloy, excellent workability can be obtained even in plastic working, particularly cold working. The processed products obtained by the pressing method are
It is preferable because the release agent is not removed and the release agent does not remain in the processing unlike the processed product obtained by the die casting method or the thixomold method.

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) C10M 135/06 C10M 135/06 135/10 135/10 135/18 135/18 137/02 137/02 137/04 137 / 04 137/10 137/10 A 143/18 143/18 159/04 159/04 // B21D 22/20 B21D 22/20 A C10N 10:02 C10N 10:02 10:04 10:04 10:12 10 : 12 20:00 20:00 Z 30:00 30:00 Z 40:24 40:24 AZ 60:04 60:04 (72) Inventor Haruo Okahara 2-15-21 Mitsuyachu, Yodogawa-ku, Osaka-shi, Osaka F-term in Kasatani Co., Ltd. (reference) 4E050 HA06 4H104 BB32A BB34A BG02C BG04C BG06C BG10C BH02C BH03C BH07C CA16C DA02 DA06A EA21A FA01 FA02 FA06 JA13 LA20 PA23 PA33

Claims (15)

[Claims] 1. A plastic working oil composition for a magnesium alloy or an aluminum alloy, which comprises a biodegradable fat as a main component. 2. (A) biodegradable oil and fat, (B) rust preventive and lubricant, and
The composition according to claim 1, which comprises (C) an extreme pressure additive. 3. The (A) biodegradable fat or oil is at least one of vegetable fats and oils, animal fats and oils and synthetic esters, and hardened fats and oils thereof, and (B) the rust preventive / lubricant is an anionic surfactant and At least one kind of oxidized paraffin, (C)
The composition according to claim 1, wherein the extreme pressure additive is at least one of (C ′) sulfur-based fats and oils, sulfur-based synthetic polyolefins, and (C ″) phosphorus-based compounds. 4. The (A) biodegradable fat or oil is added in an amount of 50% by weight of the total composition.
The composition according to claim 1, wherein the composition comprises at least wt%. 5. When the total amount of the composition is 100% by weight,
The content of the component (A) is 50 to 90% by weight, the content of the component (B) is 2 to 30% by weight, and the content of the component (C ') is 2
To 30% by weight, the content of the (C ″) component is 2 to 30% by weight, and the total content of the (B) component, the (C ′) component and the (C ″) component is 10 to 50%. The composition according to claim 3, wherein the composition is wt%. 6. The composition according to claim 2, further comprising (D) an organozinc compound and (E) an organomolybdenum compound. 7. The composition according to claim 1, which has a biodegradability of 60% or more in a test according to CEC (European Standards Advisory Committee) standard L-33-T-82. 8. A method for processing a magnesium alloy or an aluminum alloy, which comprises applying the composition according to claim 1 to a magnesium alloy or an aluminum alloy and then cold-pressing the composition. 9. A pressed product of a magnesium alloy having a specific gravity of 1.7 or less. 10. A mobile information terminal, the housing of which comprises the pressed product according to claim 9. 11. A notebook computer, the housing of which is the pressed product according to claim 9. 12. A video device, the housing of which is the pressed product according to claim 9. 13. A housing and at least one internal mechanical component
A robot whose seed is the pressed product according to claim 9. 14. An information recording and / or reproducing apparatus in which a housing is made of the pressed product according to claim 9. 15. A game machine in which the internal mechanical component is the pressed product according to claim 9.