JP3133669B2 - Manufacturing method of composite board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a composite plate having different characteristics on both sides.

[0002]

2. Description of the Related Art Conventionally, in order to form a plate having abrasion resistance on its surface, a hard metal such as stellite is welded on a plate to be a base material. . This is because, for example, stellite has a very high hardness and is excellent as a wear-resistant material, but lacks workability and makes it very difficult to manufacture a stellite plate. Furthermore, since it is extremely difficult to join and fix such a material having a hard metal surface, it is necessary to provide a stellite layer on a workable base material to enable joining and fixing of the material. It is being done. In this method, overlay welding is performed using a welding rod made of hard metal such as stellite, for example, on a rolled carbon steel sheet, so that the width that can be overlaid in one pass is narrow, and the welding speed also causes cracks in the welded portion. Due to the characteristics of the deposited metal that it is easy to deposit, it was not possible to do so quickly, and the deposited amount was about several tens of kg / h. Furthermore, it is difficult to weld-weld a long welding line at a time. For example, in order to manufacture a long two-layer composite plate, it is necessary to further lengthen the welded two-layer composite plate by welding. Have been done. In addition, a clad material is generally used as a plate material having corrosion resistance on the surface.
In order to manufacture the clad, a plate material forming a base material and a corrosion-resistant plate material forming a surface layer are often overlapped and rolled.

[0003]

Therefore, when manufacturing the above-mentioned conventional composite plate material having abrasion resistance, a large amount of labor and time are required because the welding is performed using a welding rod having poor weldability. However, the productivity was extremely low and the economy was poor. Furthermore, the above-mentioned wear-resistant welded metal is liable to cause crater cracks, making it difficult to add a build-up bead, and thus has a limited welding line length. It was difficult to manufacture. Moreover, to prevent cracking while maintaining the hardness of the overlay,
It required a high level of skill and skill and had a problem that it was inevitably expensive. Furthermore, it is difficult to form a weld overlay bead uniformly, and there is also a problem that welding defects may be present. There is also a problem that this also requires a lot of labor and time. On the other hand, there is a problem in that extremely large equipment is required to form the corrosion-resistant clad material by rolling, the equipment cost is high, and there is a limit in reducing the product cost. Furthermore, since the clad material is formed by pressure welding, the joint of the clad material is liable to have a poorly bonded portion,
If a two-layer composite plate having no material defect at the joining boundary is to be obtained, there is a problem that the yield is reduced. Therefore, an object of the present invention is to solve the above-described problems and suppress the generation of intrinsic material defects, at a low cost, and easily, on one surface, different from the other surface, for example, abrasion resistance. Another object of the present invention is to provide a method for producing a composite plate material integrally formed by imparting characteristics such as corrosion resistance.

[0004]

[Means for Solving the Problems]

[First Characteristic Configuration] A first characteristic configuration of the method for manufacturing a composite plate material according to the present invention for the above object is to cast a first molten metal as an outer layer metal into a cylindrical mold by centrifugal casting. After solidification of the outer layer metal, the first metal
A second molten metal material different from the molten metal is cast on the inner surface of the outer layer metal to form a two-layer metal tube, and after removing the two-layer metal tube from the mold, the pipe is moved in the circumferential direction of the tube. The point is that a composite plate is formed by cutting a plurality of portions (corresponding to claim 1). [Effects of the first characteristic configuration] Therefore, according to the first characteristic configuration, if a two-layer metal pipe having different materials of the inner and outer layers is formed by centrifugal casting, the two-layer metal can be easily formed. Either the metal or the second metal is used as a metal that gives characteristics to the two-layer metal to be formed, and the other is used as a base material, which is cut and divided in the circumferential direction of the two-layer metal tube to form one surface. It is possible to produce a two-layer plate material having characteristics similar to that of a substantially flat plate supported by a base material. Therefore, by using one of the inner and outer layers as a metal material having desired characteristics and the other as a preferable metal material as its base material, a plate material having characteristics different from those of the other surface on one surface can be easily manufactured. it can. Further, the metallographic continuity is maintained between the inner and outer layers of the two-layer metal tube obtained by centrifugally casting the first metal and the second metal in the same mold, and the Separation between the inner and outer layers can be prevented. As a result, for example, a two-layer plate material that imparts properties different from that of the other surface to the other surface such as abrasion resistance and corrosion resistance, and that is strongly supported by the metal on the other surface side is used as an internal material. Inexpensive and simple manufacture can be achieved while suppressing generation of defects. [Second characteristic configuration and operation and effect] The second characteristic configuration of the method for manufacturing a composite plate material according to the present invention for the above object is that a metal having a lower melting point than the outer layer metal is cast as the inner layer metal in the first characteristic configuration. By casting a metal having a melting point lower than the melting point of the outer layer metal as the inner layer metal, it is possible to prevent the inner layer metal from being melted into the outer layer metal at the time of casting. In addition, it is possible to suppress the occurrence of casting defects in the boundary layer between the inner and outer layers and the occurrence of disturbance such as waving of the boundary layer. As a result, it becomes possible to manufacture a two-layer plate material in which generation of intrinsic material defects is more reliably suppressed. [Third characteristic configuration and operation and effect] A third characteristic configuration of the method for manufacturing a composite plate material of the present invention for the above object is to cast a wear-resistant metal as the inner layer metal in the first or second characteristic configuration. For example, if the outer layer metal is used as a base material, a carbon cast steel is cast, and the inner layer metal is a metal having properties, a Ni alloy cast steel is cast. Since the casting can be performed at a temperature lower than the melting point, the formation of defects in the boundary layer between the inner and outer layers can be suppressed, the toughness is imparted to the outer layer metal, and the inner layer metal can exhibit abrasion resistance. As a result, the generation of intrinsic material defects can be more reliably suppressed, and a two-layer plate material having sufficient wear resistance on the inner metal surface can be manufactured. [Fourth feature and operation and effect] A fourth feature of the method for manufacturing a composite plate material of the present invention for the above object is to cast a corrosion-resistant metal as the inner layer metal in the first or second feature. For example, if the outer layer metal is used as a base material, carbon cast steel is cast, and the inner layer metal is a metal having properties, and corrosion resistant cast steel is cast,
Since the casting temperature can be cast at a temperature lower than the melting point of the outer layer, the generation of defects in the boundary layer between the inner and outer layers can be suppressed, the toughness is imparted to the outer layer metal, and the inner layer metal can exhibit corrosion resistance. . As a result, the generation of intrinsic material defects can be more reliably suppressed, and a two-layer plate having sufficient corrosion resistance on the inner metal surface can be manufactured. [Fifth characteristic configuration and operation and effect] A fifth characteristic configuration of the method of manufacturing a composite plate according to the present invention for the above object is to plastically process the composite material formed by any of the first to fourth characteristic configurations. (Corresponding to claim 5), it is more preferable to form a composite flat plate material by, for example, casting a carbon cast steel as an outer layer metal and casting a corrosion resistant cast steel as an inner layer metal to form a two-layer pipe in the circumferential direction. If the sheet is cut at a plurality of locations to obtain a band-shaped plate, and is flattened by, for example, rolling, a two-layer flat plate having desired characteristics can be obtained. As a result, for example, a two-layer composite plate having sufficient corrosion resistance on the surface of the inner metal layer can be manufactured.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As an example of an embodiment of the method for producing a composite plate according to the present invention, an example of producing a composite plate having a wear-resistant surface will be described below with reference to the drawings. explain. First, in order to form the outer layer metal 2 by centrifugal casting, carbon steel (JIS SC 3
7) An equivalent material is cast from the casting port 16 on one end side of the mold 1 and, in order to form the inner layer metal 3, a high-manganese cast steel is used as a second metal, which is a metal having characteristics of the two-layer composite plate material. A certain hadfield steel (JIS SCMn5) was cast from the casting port 1a at the other end of the mold 1 (see FIG. 2), and the outer diameter was 20 mm.
00 mm, wall thickness 30 mm (outer layer thickness 18 mm, inner layer thickness 12
mm), a two-layer metal tube 4 having a length of 2000 mm (FIG. 1 (A)
1), and as shown in FIGS. 1A and 1B, the two-layer metal tube 4 is cut along a cutting plane Y1-Y1, Y2- Y2, Y3-Y3, Y4
Cut at -Y4, and divide it into eight equal parts in the circumferential direction, and cut out the strip 5 made of a partially cylindrical composite plate. The cut-out strip 5 has a curved outer portion formed of a carbon steel casting and an inner portion formed of hadfield steel. Since there is no great difference in composition between the first metal and the second metal, the boundary layer between the outer metal 2 and the inner metal 3 does not become discontinuous, and an integrated strip 5 is obtained. . Next, the strip 5 is kept at 1000 ° C. for 1 hour in an inert atmosphere and then water-cooled (water toughness treatment). Hadfield steel after water toughness treatment has high tensile strength and elongation, and has a low yield point, so plastic working is easy, and plastic working is possible in the same manner as carbon steel cast steel of the outer layer metal, as shown in FIG. Thus, a composite flat plate 5A having a width of about 400 mm, a thickness of 25 mm, and a length of 2000 mm is prepared by cold rolling. Composite plate 5 after cold rolling
In A, the Hadfield steel was work-hardened, and the surface hardness (Hv) on the carbon steel side was 186, whereas the surface hardness (Hv) on the Hadfield steel side was 332. In this way, a composite flat plate having a high surface hardness was obtained while the base material layer had sufficient toughness.

Next, another embodiment of the present invention will be described. <1> In the above-described embodiment, a high-manganese cast steel is used for the two-layer metal pipe so that the first metal as the base material is carbon steel cast steel and the second metal has abrasion resistance as a characteristic. Although an example in which a certain Hadfield steel is used has been described, the outer and inner metal layers 2 and 3 are not limited to cast steel products, but may be a Ni-based alloy, a Co-based alloy, or other non-ferrous metals. Further, the inner layer metal 3 may be used as the base material. For example, when the casting temperature of the material having the property is higher than the casting temperature of the base material, casting the base material later can stabilize the characteristics of the product. Further, even when the metal having the properties as the outer layer metal 3 is inferior in plastic workability, a compressive stress is applied to the outer layer metal 3 during the flattening, so that cracks due to the processing can be suppressed. Also, in order to impart abrasion resistance after being flattened by rolling, one of the outer and inner metal layers 2 and 3 is made of a low carbon cast steel and the other is a precipitation hardening type alloy (for example, maraging stainless steel). Is N
Using AS MA164), after cold rolling, soaking at 950 ° C. followed by air cooling, it is possible to obtain a surface to which abrasion resistance is to be imparted having a hardness of Hv352. If the heat treatment after the cold rolling is heated to 525 ° C. after the air cooling and held for 4 hours, the hardness can be increased to about Hv510. <2> When the composite plate 5 can be used without being flattened, cast carbon steel is used for the first metal and 27 for the second metal.
It is also possible to cast Cr cast iron, Ni hard cast Ni alloy, stellite Co alloy, or the like. For example, Hadfield steel is conventionally used for the lining material of a ball mill, but instead of using this, the composite plate material of the present invention having abrasion resistance only on the surface is used to rely on work hardening accompanying use. It is possible to apply a lining material having a high surface hardness to a ball mill without any problem. The lining material is usually fixed to the fuselage by bolts. However, if the base material is easy to process carbon steel, the lining material can be easily fixed to the composite plate by stud welding or stud welding. Down becomes possible. In this case, for example, a double-layer metal pipe having an outer diameter of
By cutting to ~ 150 mm, a material close to a flat plate can be obtained. The casting method as shown in FIG. 3 is also suitable for forming such a two-layer metal tube. <3> Although the example in which the second metal in the above-described embodiment is wear-resistant steel is shown, the second metal may be corrosion-resistant steel. For example, the second metal is Inconel 625, which is a Ni-based stainless alloy. (C: 0.10% or less, Cr: 20 to 23%, Mo: 8 to 10%, Nb:
3.15 to 4.15%, Fe: 5% or less)
Corrosion resistance can also be imparted to the second metal side using S304, SUS316, or the like. This way, for example,
When low-manganese cast steel is used so that the first metal retains strength as a base material, the inner metal 3 composed of the second metal maintains the corrosion resistance while the outer metal 2 composed of the first metal retains the required strength. Will be able to do it. Note that the first metal and the second metal can be exchanged, and a stainless alloy may be used on the side suitable for centrifugal casting. In the case of Inconrl625 in the above example, after cutting into strips, hot pressing at a temperature of 500 to 600 ° C.
If a solution treatment in which water is cooled after water is soaked at 00 ° C., a composite flat plate having good corrosion resistance on one side can be obtained. <4> In the above embodiment, an example in which flattening is performed by cold rolling has been described. However, the plastic working is not limited to rolling, but may be press working or plastic working such as explosive forming. In addition, a suitable processing temperature can be selected according to the material. <5> In the above embodiment, the outer diameter is 2000 mm,
An example of manufacturing a double-layer metal tube having a wall thickness of 30 mm (an outer layer thickness of 18 mm and an inner layer thickness of 12 mm) and a length of 2000 mm was shown.
These dimensions and the like are merely examples, and the specifications of the two-layer metal tube can be arbitrarily selected. The cutting width is also arbitrary.

[0007] In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a production process of a composite plate material of the present invention from a two-layer metal tube.

FIG. 2 is an explanatory diagram of a manufacturing process of the double-layer metal tube of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 mold 2 outer layer metal 3 inner layer metal 4 double layer metal tube 5 composite plate 5A composite plate

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-76263 (JP, A) JP-A-2-127918 (JP, A) JP-A-57-91823 (JP, A) JP-A-58-1983 47583 (JP, A) JP 41-14368 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B22D 19/16 B21B 1/38 B21C 37/02 B22D 13/02 503

Claims (5)

(57) [Claims] 1. A first molten metal is cast as an outer layer metal (2) into a cylindrical mold (1) by centrifugal casting, and after solidification of the cast outer layer metal (2), the inner layer metal (3). A second metal melt different from the first metal melt is cast on the inner surface of the outer metal (2) to form a two-layer metal tube (4), and the two-layer metal tube (4) is A method for producing a composite board material in which a composite board (5) is formed by taking out from a mold (1) and cutting a plurality of locations in the circumferential direction of the tube. 2. The method according to claim 1, wherein a metal having a lower melting point than the outer metal (2) is cast as the inner metal (3). 3. The method according to claim 1, wherein a wear-resistant metal is cast as the inner metal layer. 4. The method according to claim 1, wherein a corrosion-resistant metal is cast as the inner layer metal (3). 5. A method for producing a composite plate, wherein the composite plate (5) formed by the method for producing a composite plate according to any one of claims 1 to 4 is plastically processed to form a composite plate (5A).