JP2005335091A - Metal/resin composite sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metal/resin composite sheet having a metal sheet constituted of a hardly cut material on its surface side, excellent in design effect, strength, corrosion resistance, weatherability and durability and having excellent cutting processability enabling industrially advantageous good cutting processing using a panel saw or the like generally used in an aluminum composite sheet. <P>SOLUTION: The metal/resin composite sheet 1 is constituted of a resin sheet 3, the surface material 2, which comprises a metal sheet being a hardly cut material, bonded to one side of the resin sheet 3 and the back material 4, which is selected from the group consisting of a cold rolled steel sheet, a cold rolled steel strip and surface treated products of them, bonded to the other surface of the resin sheet 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides a panel saw or the like generally used for an aluminum composite plate, although the surface side metal plate is composed of a difficult-to-cut material and has excellent design, strength, corrosion resistance, weather resistance, and durability. The present invention relates to a metal-resin composite plate having excellent cutting workability, which can be used for industrially favorable cutting.

  2. Description of the Related Art A metal-resin composite plate configured by using a resin sheet as a core material and joining metal plates to both surfaces thereof is well known. This metal-resin composite plate is a material that has moderate strength and elasticity, and has many features such as lightness, design, and metal-like processability, and is widely used for building exterior walls and signboards. It has been.

  In such a metal-resin composite plate, the resin sheet of the core material is made of a mixture of non-combustible inorganic material and polyolefin resin in order to impart non-combustible performance. May be used.

  On the other hand, aluminum, stainless steel, titanium or the like is used as the material for the front and back metal plates, but aluminum is the most common (hereinafter referred to as “aluminum composite plate” using aluminum plates as the front and back metal plates). Sometimes called). However, since sufficient corrosion resistance cannot be obtained with an aluminum composite plate, a metal resin composite plate having a structure in which the front surface side is a titanium plate having excellent corrosion resistance and the back surface side is a stainless steel plate is also known (see Patent Document 1). ) However, when high performance in strength and corrosion resistance is required, especially in the outer wall of a building, generally, a metal plate of a difficult-to-cut material having a machinability index of 80 or less on both the front and back surfaces. A metal resin composite plate using is used.

The “machinability index” is an index indicating the ease of cutting workability of a metal material. In the present specification, the following 1. The cutting speed at which the tool life is 60 minutes is obtained by cutting the metal material under the conditions of 2. The following 3. Represents an index when the cutting speed of the free-cutting steel is 100.
1. Processing conditions:
・ Cut type: Grooving with end mill ・ Tool: Square end mill made of high-speed tool steel ・ Cutting width: 10-50mm
・ Cutting depth: 0.75 to 1.5 mm
2. Cutting speed: Cutting speed at which the tool life is 60 minutes.
The cutting speed is given by the following formula.
Cutting speed (m / min)
= Π × end mill diameter (mm) × end mill speed (rpm) / 1000
3. Standard metal material and machinability index JIS SUM11 free-cutting steel (sulfur free-cutting carbon steel defined in JIS G 4804 (1999)) or its equivalent is used as a standard. The machinability index of each metal material is indicated by an index when the cutting speed of the free-cutting steel is 100.
Table 1 shows the cutting speed and machinability index of typical metal materials.

JP-A-9-11394

  However, when the metal resin composite plate is used as an exterior panel or the like used for an outer wall of a building, a cut having a V-shaped or U-shaped cross section is usually provided on the back surface of the metal resin composite plate (hereinafter referred to as such The processing is sometimes referred to as “V-groove processing”.) In many cases, this notch is bent inside and processed into a tray-like panel. In this case, if the machinability of the metal plate on the back surface side is poor, there are significant restrictions on the machines and machining conditions that can be used for V-groove machining.

  For example, in the case of a metal resin composite plate in which difficult-to-cut materials are laminated on the front and back surfaces of the resin sheet as described above, in the V-groove processing, fine setting of cutting conditions such as the number of rotations and feed speed suitable for the work piece Therefore, it is necessary to use a CNC router (Computerized Numerical Control Router). This CNC router is a machine that V-grooves a plate placed on a table by moving the cutting head on a horizontal processing table. The cutting head can be moved in the XYZ axis direction by a computer program. It can be done.

  However, this processing machine can perform V-groove processing of a metal resin composite plate using difficult-to-cut materials, but the device itself is expensive and has a low diffusion rate, and can only be processed by a specific processor. In addition, the cutting speed is slow, a special square end mill is required, and the lifetime is short, resulting in high processing costs.

  In order for metal-resin composite plates to become widespread, the productivity is low by using processing machines such as panel saws that are generally widely used for aluminum composite plates, rather than such expensive and special cutting machines. It is desirable that the metal resin composite material be capable of V-groove processing at a low cost.

  On the other hand, the metal resin composite plate has sufficient mechanical strength; it does not deform due to a difference in thermal expansion even when exposed to temperature changes; has corrosion resistance that can be used outdoors for many years; It is also required to possess the basic required performance as a composite material.

  However, metal resin composite plates using difficult-to-cut materials on both the front and back surfaces have poor machinability even if they can meet these basic performance requirements, and different metal plates are used on the front and back sides to ensure machinability. In the case where is used, the above-mentioned required performance cannot be satisfied, and a metal resin composite plate that can satisfy such conflicting requirements has not been established industrially.

  Therefore, the present invention is a panel saw generally used for aluminum composite plates, although the surface side metal plate is made of a difficult-to-cut material and has excellent design, strength, corrosion resistance, weather resistance, and durability. It is an object of the present invention to provide a metal resin composite plate having excellent cutting workability, which can be advantageously cut industrially by using the above.

  The inventors of the present invention have developed and studied a metal-resin composite plate that is excellent in strength, corrosion resistance, weather resistance, durability, designability, and excellent in machinability. The present invention relating to a resin composite board has been reached.

  The gist of the present invention is a cold rolled steel sheet joined to a resin sheet, a surface material made of a difficult-to-cut metal plate joined to one surface of the resin sheet, and the other surface of the resin sheet. And a cold-rolled steel strip and a metal-resin composite plate characterized by comprising a back material selected from the group consisting of these surface-treated products (hereinafter referred to as “cold rolled steel sheets”). .

  Since the metal-resin composite plate of the present invention has a hard-to-cut metal plate as a surface material, it is excellent in strength, corrosion resistance, and durability, and it is also possible to enhance the design. On the other hand, by using cold-rolled steel sheets as the back material for such a surface material, there is no problem of deformation due to the difference in thermal expansion coefficient between the metal plates on the front and back surfaces, and a metal-resin composite excellent in machinability Board can be provided.

  As described above, conventionally, a metal-resin composite plate that does not cause problems of strength and warpage has been obtained by selecting difficult-to-cut materials for both the front surface material and the back surface material. However, in this case, the machinability is poor, and a special processing machine and labor are required, which limits the range of use.

  However, in the present invention, by selecting specific materials and related materials as the back material and the surface material, the strength, corrosion resistance, and design properties of the surface material, which could not be achieved in the past, are not impaired, and warping and A revolutionary metal-resin composite plate with improved workability and workability has been realized by avoiding problems such as deformation.

  That is, the present inventors examined a method of performing V-groove processing of a metal resin composite plate using a panel saw or the like used for V-groove processing of an aluminum composite plate as a surface material. As a result, if cold-rolled steel sheets are used for the metal plate on the back surface, it is possible to industrially process V-grooves using the panel saw etc. used for the aluminum composite plate as it is, and further, the surface material and the back surface By maintaining the thermal expansion coefficient ratio of the metal plate of the material, and the physical and mechanical properties of the surface material within a specific range, the warpage due to the difference in thermal expansion coefficient and the performance under load due to the difference in mechanical property It was found that problems such as deterioration can be avoided.

  When the metal plates on both sides of the metal resin composite plate are of different materials, the core resin sheet and the metal plates on both sides are bonded together under heating and pressure, and then cooled to produce the metal resin composite plate Due to the difference in coefficient of thermal expansion, the metal resin composite plate warps above the standard, and when the product is used by the user, after being attached to the outer wall, the problem of warpage due to temperature change when exposed to direct sunlight Arise. Moreover, it may be difficult for the strength when subjected to a wind load to satisfy the standard. The present inventors have practically hindered this problem by keeping the surface material and the back material at a thermal expansion coefficient ratio in a specific ratio range, and further by selecting the physical and mechanical properties of the surface material. It was found that it can be suppressed to the extent that there is no.

  In the metal-resin composite plate of the present invention, the surface material preferably has a thermal expansion coefficient ratio of 0.7 to 1.4 with respect to the back material, a yield point or a proof stress of 165 MPa or more, and an elastic modulus of 100 GPa or more. . The machinability index of the surface material is preferably 80 or less. The surface material is preferably a stainless steel plate.

  On the other hand, as a resin sheet, what has a nonflammable inorganic substance and polyolefin resin as a main component is preferable.

  In the present invention, the thickness of the surface material and the back material is 0.1 to 1 mm, respectively, and the ratio of the thickness of the surface material to the back material is preferably 0.8 to 1.2, and the thickness of the resin sheet Is preferably 60 to 90% of the total thickness of the composite plate.

  According to the present invention, it has excellent mechanical strength, design properties, corrosion resistance, excellent weather resistance, and sufficiently satisfies the basic performance as a composite material such as small deformation due to a difference in thermal expansion at the time of temperature change. Above, although the surface side metal plate is a difficult-to-cut material, the machinability as a metal resin composite plate is good, and a general processing machine such as a panel saw widely used for an aluminum composite plate is used. Thus, a metal resin composite material capable of easily performing V-groove processing is provided.

  Hereinafter, embodiments of the metal resin composite plate of the present invention will be described in detail. In addition, the following description is an example (representative example) of the embodiment of this invention, and this invention is not specified to the following content, unless the summary is exceeded.

  The metal resin composite plate of the present invention basically has a laminated structure of a surface material / resin sheet / back material.

  The front and back surfaces of the metal-resin composite plate can be arbitrarily determined. Here, however, the side of the outer wall or the like that requires aesthetic appearance is usually the front surface, and the other side is subjected to bending processing such as V-groove processing. The side is the back side.

[Back material]
The cold-rolled steel sheets used as the back material of the metal resin composite plate of the present invention are cold-rolled steel sheets, cold-rolled steel strips, or those subjected to surface treatment such as plating or painting. .

Specific examples of the back material include the following.
JIS G3141 Cold rolled steel plate and steel strip JIS G3302 Hot dip galvanized steel plate and steel strip JIS G3312 Painted hot dip galvanized steel plate and steel strip JIS G3312 Hot dip galvanized steel plate and steel strip JIS G3317 Hot dip -5% aluminum alloy plated steel plate and steel JIS G3318 Painted hot-dip zinc-5% aluminum alloy-plated steel plate and steel strip JIS G3321 Hot-melted 55% aluminum-zinc alloy-plated steel plate and steel strip JIS G3122 Painted hot-dip 55% aluminum-zinc alloy-plated steel plate and steel strip

  The cold-rolled steel sheets used for the back material are those that are easy to cut and have a machinability index greater than 80, particularly 90 or more, and particularly close to 100 of free-cutting steel. preferable.

Moreover, the thermal expansion coefficient of cold-rolled steel sheets may be usually 11 × 10 ⁻⁶ / ° C. to 13 × 10 ⁻⁶ / ° C., and the yield point or proof stress may be usually 230 MPa or more, and the upper limit is 400 MPa or less. It only has to be about. Furthermore, the elastic modulus may be about 200 GPa or more and 220 GPa or less. In addition, in this specification, a thermal expansion coefficient shows the linear thermal expansion coefficient in 20-100 degreeC.

  As a particularly preferable back material satisfying such physical properties, among the above-described cold-rolled steel plates, a coated molten 55% aluminum-zinc alloy plated steel plate and the like can be mentioned.

[Surface material]
The surface material of the metal resin composite plate of the present invention is a metal plate or a metal strip (hereinafter sometimes referred to as “hard-to-cut metal plate”) of a difficult-to-cut material. This surface material is a hard, hard-to-cut metal plate with excellent design and corrosion resistance, and preferably has a constant coefficient of thermal expansion relative to the back surface material, has a high yield point or yield strength, and a high elastic modulus. It is a metal plate.

  Hereinafter, suitable physical properties of the surface material will be described.

(1) Machinability The machinability of the difficult-to-cut metal plate of the surface material is preferably 80 or less, particularly 60 or less as the machinability index. In general, a metal material has a higher mechanical strength such as tensile strength as the machinability is worse, and the surface material has a machinability index of 80 or less. Etc. can be secured sufficiently. If the machinability index of the surface material is excessively low, the machinability as a metal resin composite plate is remarkably inferior, and therefore it is preferably about 30 or more. Even if the surface material is such a difficult-to-cut material, preferably, the thermal expansion coefficient ratio with the cold-rolled steel sheets of the back surface material is kept in the appropriate range, and the physical and mechanical properties are in the appropriate range, A metal-resin composite plate having excellent cutting workability can be realized.

(2) Thermal expansion coefficient ratio The thermal expansion coefficient ratio (TE _a / TE _b ) of the thermal expansion coefficient TE _a of the hard-to-cut metal plate of the surface material to the thermal expansion coefficient TE _b of the cold-rolled steel sheets of the back surface is usually 0. It is preferably 7 or more, particularly 0.8 or more, and usually 1.4 or less, particularly 1.2 or less. Even if this thermal expansion coefficient ratio exceeds the upper limit or falls below the lower limit, the metal resin composite plate may be warped beyond the practical range due to the difference in thermal expansion between the front surface material and the back surface material.

(3) Yield point or yield strength The yield point or yield strength of the difficult-to-cut metal plate of the surface material is preferably 165 MPa or more, particularly preferably 230 MPa or more. When the yield point or the proof stress is below this lower limit, the strength as the metal resin composite plate is lowered, and an extra cost for reinforcement is required. The upper limit of the yield point or yield strength of the surface material is usually 400 MPa or less. Even if it exceeds this upper limit, the improvement of the mechanical strength as the whole metal resin composite board is not recognized.

(4) Elastic modulus The elastic modulus of the hard-to-cut metal plate of the surface material is preferably 100 GPa or more, particularly 110 GPa or more, particularly 200 GPa or more and 220 GPa or less. If the elastic modulus is less than this lower limit, deformation when subjected to a load is large, extra cost for reinforcement is required, and even if the upper limit is exceeded, the mechanical strength of the metal resin composite plate as a whole is not improved.

  In the present invention, the hard-to-cut metal plate used as the surface material is not particularly limited as long as it satisfies the physical properties as described above, and has good corrosion resistance, excellent design properties, and difficult-to-cut materials. For some reason, stainless steel is preferred.

Stainless steel alloy types include SUS316 (Machinability Index 45, Thermal Expansion Coefficient 16.0 × 10 ⁻⁶ / ° C., Yield 205 MPa and Elastic Modulus 190 GPa), YUS220M (Machinability Index 61, Thermal Expansion Coefficient 10 4 × 10 ⁻⁶ / ° C., yield strength of 295 MPa or more, and elastic modulus of 200 GPa).

[Resin sheet]
In the metal resin composite plate of the present invention, the resin sheet is usually a non-combustible inorganic material, a thermosetting resin or a thermoplastic resin, especially a non-combustible inorganic material and a thermoplastic resin, particularly a non-combustible inorganic material, and a polyolefin such as polyethylene or polypropylene. It is preferable to be composed of a resin or a mixture with an ethylene-vinyl acetate copolymer resin, but for use in a place where fire resistance is not required depending on the application, a polyolefin resin that does not contain a nonflammable inorganic substance, ethylene -What consists of various resins, such as a vinyl acetate copolymer resin, a vinyl chloride resin, a phenol resin, and a urethane resin, can be used.

  Moreover, as a nonflammable inorganic substance for imparting flame retardancy, 1 of nonflammable inorganic fillers such as oxides, hydroxides, silicates, carbonates or sulfates such as magnesium, calcium, barium or aluminum Species or two or more can be used. The content of these incombustible inorganic fillers in the resin sheet is usually 50% by weight or more, particularly 60% by weight or more, and usually 90% by weight or less, particularly preferably 80% by weight or less. If the content of the nonflammable inorganic filler is less than the above lower limit, sufficient flame retardancy due to the blending of the nonflammable inorganic filler cannot be obtained, and if it exceeds the upper limit, the binding property is inferior, and the resin sheet Becomes brittle.

  Incombustible inorganic fillers can adopt various shapes such as granular, fibrous, and flaky, but flame retardancy must always satisfy the certification standards for building materials, so the particle size, fiber length, It is important to carefully select the fiber diameter.

  The resin sheet may contain various additives such as a stabilizer, a colorant, a crosslinking agent, a foaming agent, an antioxidant, and an ultraviolet absorber, in addition to the nonflammable inorganic filler and the resin.

  In addition, the resin sheet may be one in which a thin resin film having adhesiveness as an adhesive layer to be described later is laminated on one side or both sides of the resin sheet. Can be secured.

  As the adhesive resin film, a thermoplastic resin film having an affinity for the core resin sheet, the hard-to-cut metal plate of the surface material, and the cold-rolled steel plates of the back material is used. Specific examples of thermoplastic resins include ethylene / acrylic acid copolymers, ethylene / vinyl acetate copolymers, ethylene / glycidyl acrylate copolymers, ethylene / maleic anhydride copolymers, and polyethylene acrylic acid graft copolymers. And a maleic anhydride graft copolymer of polyethylene, and the thickness thereof is usually about 30 to 50 μm.

  In addition, you may use this adhesion | attachment resin film by carrying out lamination | stacking adhesion | attachment on the resin sheet adhesion surface side of a surface material and a back surface material.

  The resin sheet as the core material may also be a laminated sheet formed by laminating two or more thin layer resin sheets, for example, 2 to 5 layers.

[Metal resin composite plate]
(Production method)
The metal resin composite plate of the present invention has a laminated structure of the surface material, the resin sheet, and the back material as described above. Such a metal resin composite plate of the present invention is produced according to a conventional method. That is, for example, a surface material of a hard-to-cut metal plate and a back surface material of cold-rolled steel sheets, each of which is degreased and surface-treated as necessary, on both surfaces of a resin sheet that has been manufactured in advance by extrusion molding or the like. The laminated body may be bonded together by heating and pressing. Moreover, while melt-extruding a resin sheet, it is also possible to unify the three by superimposing a surface material and a back material on both sides. In any case, as a method for adhering the resin sheet to the front surface material and the back surface material, a conventionally known method can be employed without restriction.

(Thickness)
The total thickness of the metal resin composite plate of the present invention is usually 0.5 mm or more, particularly 0.7 mm or more, and usually 10.0 mm or less, particularly 5.0 mm or less. If the total thickness of the metal-resin composite plate is too thin, the mechanical strength required for the metal-resin composite plate cannot be satisfied, and if it is too thick, it is not preferable in terms of reducing the thickness and weight, and as a commercial building material Loses its cost competitiveness.

  Moreover, it is preferable that the ratio of the thickness of the resin sheet with respect to the total board thickness of a metal resin composite board is 60 to 90%. By increasing the proportion of the thickness of the resin sheet in the total thickness of the metal-resin composite plate, the rigidity can be increased without sacrificing its lightness, but if this proportion is excessively large, In particular, the thickness of the front surface material and the back surface material becomes thin, and the required corrosion resistance, weather resistance and mechanical strength cannot be satisfied.

  The thicknesses of the hard-to-cut metal plate for the front material and the cold-rolled steel plates for the back material are each preferably 0.1 mm or more, particularly 0.2 mm or more, and 1.0 mm or less, particularly 0.8 mm or less. If the thickness of the surface material and the back material is too thick, the weight will be heavy and weight reduction will not be achieved. If it is too much, the required strength and durability cannot be satisfied.

  Moreover, it is preferable that the ratio of the thickness of the hard-to-cut metal plate of the front surface material and the cold-rolled steel plates of the back surface material is in the range of 0.8 to 1.2, and these are approximately the same thickness. Most preferred. If the thickness of the surface material and cold-rolled steel sheet is outside the above range, it will be difficult to maintain the flatness by maintaining the tension balance between the surface material and the back material during production, and the strength as a metal resin composite plate is Since the surface material and the back material are determined by the weaker one, it is meaningless to increase the thickness of the other material alone.

(Processability)
The metal-resin composite plate of the present invention has good machinability and can be easily V-grooved with a processing machine such as a panel saw widely used for aluminum composite materials. As described above, when a metal resin composite plate is processed into a panel or the like constituting the outer wall of a building, the metal resin composite plate is cut into a predetermined size, and then the back surface is cut into a V-shape. (V groove processing), and then bent along the groove to form a tray-like panel. In addition to the panel saw, a stationary type circular saw such as a running saw or an elevator, a manual processing machine such as a grooving cutter or a milling machine can be used for the V-groove processing. Such machines are currently widely used for V-groove processing of aluminum composite materials, but the fact that such highly versatile processing machines can be used as they are for the metal-resin composite plate of the present invention is extremely industrially valuable. high.

  The panel saw was originally a woodworking processing machine. Based on this machine, several panel saw manufacturers around the world have improved it so that it can be applied to the machining of aluminum composite plates, and are sold as processing machines for aluminum composite plates. Panel saws are inexpensive, highly productive, have sufficient accuracy, and are currently the mainstream of V-groove processing machines for aluminum composite plates throughout the world. The panel saw is a circular saw machine having a substantially vertical processing table, and a disc-shaped cutter having a V-groove blade is attached in place of the circular saw.

  Cutting tips are attached to the blades of the V-grooves of the panel saw, and appropriate V-grooves are cut by the shape design of these tips. The chip material may be a commonly used cemented carbide, but a cemented carbide with a ceramic coating such as TiN has a longer life and is particularly preferable. That is, the machinability of the cold-rolled steel sheets used for the back material in the present invention is remarkably worse than that of an aluminum alloy. However, with such cutting tips, many panel saws used for aluminum composite plates are used as they are. Thus, V-groove processing can be performed.

  In addition, in the metal resin composite plate of the present invention, a coating film made of an organic paint is formed on at least one metal plate surface, particularly the hard-to-cut metal plate surface of the surface material, from the standpoint of maintaining and improving design properties and corrosion resistance. You may do it. Examples of the organic paint here include fluorine resins, acrylic resins, polyester resins, polyurethane resins, and the like, and fluorine resins are particularly preferable. The thickness of the coating film is usually 20 μm or more, for example, in the range of 25 to 50 μm, although it varies depending on the coating type and coating color.

  EXAMPLES The present invention will be described more specifically with reference to the following examples and comparative examples. However, the present invention is not limited to the following examples unless it exceeds the gist.

In addition, as a surface material and a back surface material, the metal plates shown in the following Table 2 (both having a thickness of 0.3 mm, a surface finish having a low gloss and a dull finish generally used for building materials having a width of 1020 mm) A coil was used. After these metal plates are washed with water, oil and fat adhering to the surface during rolling of the metal plate is removed by immersion in a degreasing solution, washed again with hot water and dried, and then the adhesive surface side with the resin sheet is coated with a coating type chromium chromate solution. A surface treatment (about 50 mg / m ^{2 in} terms of chromium) was performed, and an adhesive resin film was thermally bonded to this surface at 200 ° C. using a heat roll. As the adhesive resin film, an ethylene / acrylic acid copolymer film having a thickness of 40 μm was used.

  In addition, as the resin sheet material, low density polyethylene LF542M (manufactured by Mitsubishi Chemical Corporation) and aluminum hydroxide with a particle size adjusted (manufactured by Alcoa), the aluminum hydroxide content in the resin sheet is 70% by weight. Used as follows.

Examples 1 and 2 and Comparative Examples 1 to 4
Using the metal plate shown in Table 3 as the front material and the back material, a metal resin composite plate was produced by the following method.

  Using a raw material supply feeder, low density polyethylene and aluminum hydroxide were supplied to a biaxial kneader at a predetermined ratio, melted and kneaded by an extruder, and extruded into a sheet having a thickness of 3.4 mm. Next, the metal sheet coils of the surface material and the back surface material are arranged on both surfaces of the obtained resin sheet, and are crimped by using a crimping bonding roll whose surface temperature is set to 180 ° C., and a metal resin composite having a total thickness of 4 mm. A board was produced.

The obtained metal resin composite plate was subjected to the following evaluation tests, and the results are shown in Table 3.
1) Deformation amount test The metal-resin composite plate produced above was cut into a size of 1000 x 1000 mm using a shear cutter to obtain a sample for measuring the deformation amount. After holding this sample in a room whose temperature was controlled at 10 ° C. for 4 hours or more, its deformation amount (initial deformation amount) was measured. Next, the temperature of the room temperature was raised to 60 ° C., and the amount of deformation (the amount of deformation after the temperature increase) was measured after maintaining the same temperature for 4 hours or more. A value obtained by subtracting the initial deformation amount from the deformation amount after the temperature rise is shown as “deformation amount” in Table 3.

  Generally, the allowable deformation amount as a building material plate is 5 mm / m or less, preferably 3 mm / m or less. A sample satisfying the standard and acceptable for practical use was indicated by ○, and a material having a large amount of deformation and impractical for use was indicated by ×.

2) V-groove machining test V-groove machining with a panel saw was performed under the following operating conditions.
Cutting tip: Ceramic coated WC Rotational speed: 4800 rpm
Feeding speed: 10m / min

  The V groove shape is as shown in FIG. In FIG. 1, 1 is a metal resin composite plate, 2 is a surface material, 3 is a resin sheet, 4 is a back material, and 5 is a V-groove.

  When the blade is worn in such V-groove processing, the burr of the V-groove begins to increase, and not only an accurate V-groove shape cannot be obtained, but finally an abnormal sound and heat are emitted, and operation becomes impossible. . There was no such problem, and good cutting workability was exhibited, and those that were practical were marked with ◯, and those that were worn out in a short time within 10 minutes after the start of cutting, and those that could not be practically cut were marked with ×.

From the results in Table 3, the following can be understood.
The metal resin composite plate (Comparative Example 1) using the stainless steel plate SUS430 with poor machinability as the back surface material and the stainless steel plate YUS220M, which is a difficult-to-cut material, as the surface material has no practical problem with deformation due to thermal expansion. V-groove machining is not possible with a panel saw. The same result is obtained when the stainless steel plate SUS316, which is a difficult-to-cut material, is used as the surface material (Comparative Example 2).

  On the other hand, in the metal resin composite plate (Comparative Example 3) using the aluminum alloy plate 1100 with good machinability as the back material and the stainless steel plate YUS220M as the surface material, V-groove processing can be performed with a panel saw, but deformation due to thermal expansion is possible. Large, exceeding the allowable amount of building material board. The same result is obtained when stainless steel plate SUS316 is used as the surface material (Comparative Example 4).

  On the other hand, in the metal resin composite plate (Examples 1 and 2) using the hot dip galvanized steel plate as the back material and the stainless steel plate YUS220M or the stainless steel plate SUS316 as the surface material, V-groove processing can be performed with a panel saw, and There is no practical problem with the amount of deformation due to thermal expansion.

It is sectional drawing which shows the V-groove shape of the V-groove processing test in an Example and a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal resin composite board 2 Surface material 3 Resin sheet 4 Back surface material 5 V groove

Claims (7)

  A resin sheet, a surface material made of a difficult-to-cut metal plate joined to one surface of the resin sheet, and a cold rolled steel sheet and a cold rolled steel strip joined to the other surface of the resin sheet A metal resin composite plate comprising: a surface material selected from the group consisting of these surface-treated products (hereinafter referred to as “cold-rolled steel sheets”).   2. The metal according to claim 1, wherein the surface material has a thermal expansion coefficient ratio of 0.7 to 1.4 with respect to the back material, a yield point or a proof stress of 165 MPa or more, and an elastic modulus of 100 GPa or more. Resin composite board.   3. The metal resin composite plate according to claim 1 or 2, wherein the machinability index of the surface material is 80 or less.   The metal resin composite plate according to any one of claims 1 to 3, wherein the surface material is a stainless steel plate.   The metal resin composite plate according to any one of claims 1 to 4, wherein the resin sheet contains a non-combustible inorganic substance and a polyolefin resin as main components.   In any 1 item | term of Claim 1 thru | or 5, the thickness of this surface material and a back surface material is 0.1-1 mm, respectively, and the ratio of the thickness of the surface material with respect to this back material is 0.8-1. 2. A metal-resin composite plate, wherein   7. The metal resin composite plate according to claim 1, wherein the thickness of the resin sheet is 60 to 90% of the total thickness of the composite plate.

Images