JP2001225007A - Coated metal plate for laminated mold and method for producing laminated mold by using the plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a precision coated metal plate for a laminated mold and a method for producing the mold by using the plate in a simple process. SOLUTION: In the metal plate for the mold one side or both sides of which are coated with a thermoplastic resin, the amount of the adherent dry resin in one-side coating is 1.0-10 g/m2, the amount of the adherent dry resin on one side in both-side coating 0.5-5.0 g/m2. In manufacturing the mold by cutting a plurality of the plates precisely one by one in a prescribed shape according to CAD data and laminating the cut plates in turn, in the case of one-side coating, the plates are laminated so that the uncoated side in contacted with the resin surface of the plate and heated so that the resin is fusion-bonded to the plate, or the plates are fusion-bonded to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated metal plate for a laminated mold and a method for manufacturing a laminated mold to be heated and joined using the same.

[0002]

2. Description of the Related Art Recently, there has been a tendency that the life cycle of a product has been shortened due to the rapid progress of technology. During the development period, the lead time of the development of the cast material is key, and the production time of the mold greatly affects the shortening of the product development. Conventionally, this mold is mainly manufactured by cutting, and the mold is designed by CAD, CAE (Computer Aided).
Molding simulation by Engineering, CAD / CAM (Computer AidedM)
Many innovative technologies such as automatic machining by automatic manufacturing, high-efficiency machining by high-speed cutting and electric discharge machining, finishing by mirror surface and automatic polishing, automatic inspection of mold by 3D measuring machine, high-performance trial molding machine, etc. It has been effective in shortening the development lead time. However, since the most important mold processing depends on cutting, the mold manufacturing time and accuracy must depend on the cutting tool.

[0003] One of the methods for solving these problems is a laminated metal mold. This means that a three-dimensional solid of a mold is regarded as a stack of thin plates with different shapes, and based on the data, each thin plate is actually cut precisely into a predetermined shape by laser or chemical etching. A metal mold is formed by laminating the metal plates thus obtained. This is a kind of a so-called rapid prototyping additive manufacturing method, which is the reverse method to the cutting method that is the removal processing. When laminating cut metal sheets, the joining method is difficult, so far, bolting, caulking, diffusion bonding, laser spot welding or seaming of laminated metal sheets, joining while laminating multiple metal sheets one by one Various joining methods such as welding or a combination thereof are being studied.

[0004]

However, in joining laminated metal sheets, bolting, caulking, spot welding or seam welding is a partial joining, and the strength and the rigidity of the mold are insufficient. There have been problems such as floating and gaps due to welding distortion. On the other hand, there is also heat joining using a brazing material. However, if a soft solder having a melting point of less than 450 ° C. is used, the strength is small, and if a hard solder having a melting point of the brazing material exceeding 450 ° C. is used, the heating joining temperature becomes high. It is not practical for a laminated mold. Diffusion bonding is a perfect bonding method, but requires a large-scale facility because the processing temperature is close to the melting point of the metal material (1300 ° C. or more in the case of iron). It is difficult and practical.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to a coated metal plate in which one or both surfaces of a metal plate are coated with a thermoplastic resin, wherein the single-sided coating has a dry adhesion of 1.0 to 10 g / m ² , The dry adhesion amount of the double-sided coating is 0.5 to 5.0 g / m ² per one side.
A coated metal plate for a laminated mold is used, and a plurality of metal plates are precisely cut into a predetermined shape one by one according to CAD data, and the cut metal plates are sequentially laminated to form a mold. in fabricating a single-sided coating, dry coverage is 1.0~10g / m ^2, when the double-sided coating, drying coating weight of the coated metal plate per side 0.5 to 5.0 g / m ^2, In the case of single-sided coating, after overlapping so that the unpainted surface and the thermoplastic resin surface are in contact with each other, the resin is fused to the metal plate by heating, or the painted metal plates are fused together and joined. did.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION As the thermoplastic resin to be coated on a metal plate, vinyl resins such as polyvinyl alcohol, polyvinyl butyral, polyvinyl acetal, polyvinyl acetate, polyvinyl chloride, polyvinyl pyrrolidone and polystyrene, and polymethyl (meth) acrylate Acrylate resins such as polybutyl (meth) acrylate, polyacrylamide, polyacrylonitrile, polyolefin resins such as polypropylene and polyethylene, polyester resins, polycarbonate resins, polyurethane resins,
Polyamide resin, urea resin, polycaprolactone resin,
A coating material using a polyarylate resin, a polysulfone resin, a silicone polyester resin, an epoxy resin, or a copolymer or a mixture thereof can be used. In addition, a polyolefin resin is modified with maleic anhydride or the like to improve adhesion, a modified polyolefin resin, a polymerization catalyst or a reaction accelerator is added to an acrylic monomer, and a monomer cement that simultaneously performs polymerization and adhesion, water resistance and heat resistance are improved. In order to improve the properties, those to which metal salts such as titanyl sulfate and chromium nitrate are added can be used.

[0007] Among these thermoplastic resins, it is preferable to use a modified polyolefin resin having a relatively low melting point of 100 to 140 ° C as a material compatible with the pressure bonding temperature of 140 to 180 ° C when using a hot press. The peel strength when the resin is coated is 1.5 kg / 10 mm or more. The joining temperature by heat fusion is preferably a temperature 40 to 80 ° C. higher than the melting point of the resin. At a heating temperature lower than the melting point of the resin, the resin does not sufficiently soften, so that stable adhesive strength cannot be obtained. Conversely, at a heating temperature exceeding 80 ° C. with respect to the melting point of the resin, the coating film becomes brittle due to thermal decomposition of the resin. turn into.

The thermoplastic resin is coated on one or both sides of a metal plate. In the case of single-sided coating, the dry adhesion amount is 1.0 to 1
A paint containing a predetermined resin is applied so as to be 0 g / m ² . If the dry adhesion amount is less than 1.0 g / m ² , the interfacial adhesion between the metal plate and the thermoplastic resin is insufficient, and the adhesive becomes easily peeled off. If it exceeds 10 g / m ² , the adhesive layer is too thick. As a result, cohesive failure of the adhesive occurs and the adhesive strength is insufficient. In order to obtain a sufficient adhesive strength, the dry adhesion amount should be 3.0 to 8.0 g /
It is preferable to apply the coating so as to obtain m ² . In the case of double-sided coating, a paint containing a predetermined resin is applied so that the dry adhesion amount is 0.5 to 5.0 g / m ² per one side. In the case of double-sided coating, when they are overlapped, the coated metal plates are in contact with each other, so that the amount of adhesion is half that of single-sided coating, and the reason for limitation is the same as in the case of single-sided coating.

The coated metal plate for a laminated mold of the present invention uses a thermoplastic resin coated on one or both sides, and a thermosetting resin coating film is formed under or on the other side of the thermoplastic resin. It may be what has been done. The metal plate used as the base material is not particularly limited in material, and may be a cold-rolled steel plate,
Various types of plated steel plates, stainless steel plates, copper plates, aluminum plates and the like can be used. Even if these metal plates are carefully selected, their thicknesses vary, and even if each sheet is slightly integrated, the error increases. Therefore, the shape is as stable as possible,
It is necessary to select a metal plate with high thickness accuracy. A cold-rolled steel sheet or an electroplated steel sheet is preferable because it is inexpensive and has a constant thickness. The plating type of the electroplated steel sheet includes zinc, nickel, a zinc-nickel alloy, copper, and chromium. Prior to the formation of the thermoplastic resin coating film, the base metal plate is subjected to a chemical conversion treatment such as mechanical polishing, pickling, phosphate treatment or chromate treatment, depending on the surface condition of the metal plate, and the coating film adhesion Can also be increased.

[0010]

EXAMPLES The following three types (A to C) of coated metal plates for laminated dies were manufactured, and various test specimens were prepared using the coated metal plates. A.
A coated metal sheet provided with a thermoplastic resin coating film on one or both sides Electro-galvanized steel sheet (sheet thickness 0.5 mm, adhesion amount on one side 3 g /
m ² ), hot-dip galvanized steel sheet (sheet thickness 0.5 mm, adhesion amount on one side 45 g / m ² ) and cold-rolled steel sheet (sheet thickness 0.5 mm)
On one or both sides of a base metal plate that has been subjected to degreasing, surface conditioning treatment, and coating type chromate treatment, a thermoplastic modified polyolefin-based resin paint (Harden MP- manufactured by Toyo Kasei Kogyo Co., Ltd.)
200) was applied so that the dry adhesion amount was 0.6 to 14.0 g / m ^2, and was dried and baked at an ultimate plate temperature of 140 ° C. for 1 minute.

B. Apply thermosetting resin coating on one or both sides
A thermosetting polyester resin paint (FLC600HQ manufactured by Nippon Paint Co., Ltd.) is applied using the same base metal plate as the coated metal plate A so that the dry adhesion amount is 3.0 to 8.0 g / m ² ,
Dry baking was performed at an ultimate plate temperature of 230 ° C. for 1 minute. C. Thermosetting resin coating film provided on one side with thermoplastic resin coating film
Is formed on the other surface using the same base metal plate as the coated metal plate A, a thermoplastic modified polyolefin resin coating film is formed on one surface under the same coating conditions as A, and a thermosetting polyester-based paint (Kansai Paint S
Z5K) was applied so that the thickness of the dried coating film became 5 μm, and the plate was dried and baked at an ultimate plate temperature of 190 ° C. for 1 minute.

[0012] The coated metal plate obtained by the production method of the performance test A~C of stacked molds for painting metal plates, tensile shear strength, compressive shear strength and maximum thickness in the case where the coated metal plate by laminating 20 sheets The dimensional error was measured.

The tensile shear strength is JIS K6850.
A coated steel sheet cut into a size of 25 mm x 100 mm according to the standard is used as a test piece, and two test pieces are overlapped to form a double clip (Plus CP-105) of 12.5 mm x 25 mm. The temperature was measured at 170 ° C. for 5 minutes in an oven using a thermocompression bonding method. The measurement was carried out using a material testing machine (Autograph AG-2000D manufactured by Shimadzu Corporation) and a tensile speed of 1.
The measurement was performed at 0 mm / min.

[0014] The compression shear strength is as follows: a coated steel plate is cut into a size of 50 mm x 50 mm in accordance with JIS K 6852, and 20 sheets are laminated and hot-pressed (MHP manufactured by Meiki Seisakusho).
C-60-550), heating temperature 160 ° C, pressure 15
The measurement was carried out using a thermocompression bonded article under the conditions of 0 N / cm ² and a heating time of 10 minutes. The measurement was performed at a compression speed of 1.0 mm / min using a material testing machine (Autograph AG-5000B manufactured by Shimadzu Corporation). Compressive shear strength (N / cm ² ) = Compressive shear load (N)
/ Cross-sectional area of sample (cm ² )

The maximum dimensional error is as follows:
It cut | disconnected to the size of 300 mm, laminated | stacked 20 sheets, and measured it using what was thermocompression-bonded on the said hot press on the same conditions. The measurement site was 2 at the four corners of the obtained laminate.
The total thickness of a 0 mm × 20 mm square was measured and determined from the difference between the maximum value and the minimum value.

As a performance test result of each adhesive specimen, the measurement results of tensile shear strength are shown in Table 1, and the coated steel sheet was measured for 20 times.
Table 2 shows the measurement results of the compressive shear strength and the maximum dimensional error when the sheets were laminated. The required adhesive strength of the laminated mold is 76
0 N / cm ² or more, and the material according to the present invention has a tensile shear strength of 765 to 912 N / cm ² and a compressive shear strength of 760 to 883 N / cm ² , so that it can be used sufficiently as a coated steel sheet for a laminated mold. It can be said that. In addition, the maximum dimensional error is 0.28 to 0.75 m if the metal sheet material is a cold-rolled steel sheet or an electroplated steel sheet having high smoothness.
m and good. On the other hand, the tensile shear strength and the compressive shear strength of the comparative example are less than 760 N / cm ² ,
It can be predicted that the laminated mold cannot be put to practical use.

[0017]

[Table 1]

[0018]

[Table 2]

[0019]

As described above, the present invention relates to a coated metal plate in which one or both surfaces of a metal plate are coated with a thermoplastic resin.
m ² , dry adhesion of double-sided coating per side 0.5-5.0
g / m ² , using a coated metal plate for a laminated mold.
According to the CAD data, a plurality of metal plates are precisely cut one by one into a predetermined shape, and the cut metal plates are sequentially laminated to form a mold.
10 to 10 g / m ² , in the case of double-sided coating, a coated metal sheet having a dry adhesion of 0.5 to 5.0 g / m ² per side, and in the case of single-sided coating, the uncoated surface and the thermoplastic resin surface should be in contact. After overlapping, the resin is fused to the metal plate by heating,
Alternatively, since the coated metal plates are fused and joined, the production of the mold is simple, high in accuracy, and no large-scale equipment is required.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazuo Umeda 7th, Takatani Shinmachi, Ichikawa-shi, Chiba Pref. 1-22-2 Kamiyacho, Naka-ku, Hiroshima-shi Nisshin Steel Co., Ltd. China branch office F term (reference) 4D075 BB92Z CA12 DA06 DB01 DC15 EA17 EB13 EB14 EB15 EB19 EB22 EB35 EB39 EB42 4F100 AA22 AB01A AB03 AK01B AK41 ALAK03 BA03 BA06 BA10B BA10C BA25B BA25C CC00 EH46B EH46C EH461 EH711 EJ301 EJ422 GB90 JB16B JB16C JL01 YY00B YY00C 4F202 AA03 AA24 AD03 AD08 AG03 AJ02 AJ09 CD16 CD28 CD30

Claims (2)

[Claims] 1. A coated metal plate in which one or both surfaces of a metal plate are coated with a thermoplastic resin, wherein the dry adhesion of one-sided coating is 1.0 to 10 g / m ² and the dry adhesion of double-sided coating is one-sided. 0.5 to 5.0 g / m < ² > per unit weight of the coated metal sheet for a laminated mold. 2. CAD (Computer Aided)
According to the Design data, a plurality of metal plates are precisely cut into predetermined shapes one by one, and the cut metal plates are sequentially laminated to form a mold, and the metal plate is coated with a thermoplastic resin on one or both surfaces. a was coated metal plate, dried coating weight of 1.0~10g / m ² single-sided coating, dry coverage of both sides paint the coated metal plate per side 0.5 to 5.0 g / m ^2, In the case of single-sided coating, after overlapping so that the unpainted surface and the thermoplastic resin surface are in contact with each other, apply heat to fuse the resin to the metal plate, or to bond the coated metal plates together by fusing. Characteristic method of manufacturing a laminated mold.