JPS62164531A - Clad plate using cast iron as core material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is applicable to automobile parts, building materials, O
A: It relates to a clad plate whose core material is cast iron, which is suitable for use as a material for parts and structures of equipment, etc.

(Prior Art) There are various materials as distribution materials.Among them, flake graphite cast iron is a material that is inexpensive and has excellent distribution properties. Fragmented graphite cast iron has mechanical strength 3 relatively low, (O) poor formability, unsuitable for cold rolling or cold bending, difficult to weld, etc. Due to its drawbacks, it is mainly used as a casting material and is not widely used as a plate material for processing.

(Problem to be solved by invention) Utilizing the vibration damping properties of flake graphite cast iron, automobile parts, building materials,
In order to use it for parts and structures such as OA equipment, it is necessary to compensate for its shortcomings in mechanical strength, formability, and weldability.

(Means for Solving the Problems) The present invention compensates for the drawbacks of cast iron by cladding spheroidal graphite cast iron with steel, and its structure is as follows.

A three-layer structure assembly is constructed using spheroidal graphite cast iron as a core material and steel materials as a mating material, and this three-layer structure assembly is hot rolled and crimped.The cladding is made of cast iron with excellent vibration distribution properties as a core material. It is a board.

(Function) By using spheroidal graphite cast iron, which has better hot workability than flaky graphite cast iron, as the core material, hot rolling and crimping can be performed relatively easily, and the spheroidal shape can be formed by hot rolling. Graphite is crushed and turns into single-state lead, which improves allocability. In addition, the steel material that is the cladding material that sandwiches the core material provides strength, workability, and weldability S.

(Example) An example of a clad plate having a core material made of cast iron according to the present invention will be described with reference to the drawings.

Spheroidal graphite cast iron, which has better hot workability than flake graphite cast iron, is used as the cast iron for the core material.

In FIG. 1, numeral 2 is a core material made of spheroidal graphite cast iron, and 2 are laminates made of steel such as low carbon steel, alloy steel, or stainless steel. Clean the adhesive surfaces of the spheroidal graphite cast iron material that will become the core material 1 and the steel material that will become the laminate material 2, sandwich the core material 1 with the laminate material 2, and attach the four circumferences of both laminate materials 2 and 2 with mild steel plates. Surrounded by four backing plates 3 made of
The three-layer structure assembly 4 is constructed by sealing the space formed by the and each backing plate 3 in a vacuum state.

When manufacturing a clad plate with a core material of cast iron with a thickness of 3 m or more, the three-layer structure combination is hot rolled and bonded, and then subjected to ferritic heat treatment to give ductility to the core material, and then subjected to surface treatment. and make it into a product.

When manufacturing a clad plate with a core material of 3III thick cast iron, the three-layer structure assembly 4 is hot rolled and bonded, and then subjected to ferritization heat treatment to give the core material ductility and surface treatment. The cold-rolled lead is crushed in the hot rolling process and becomes flaky graphite, as shown in the micrograph of FIG. 2.

Next, the effect will be explained.

In such a clad plate with cast iron as the core material, the laminates 2 on both sides of the core material 1 serve as reinforcing materials to maintain mechanical strength of 8# and to improve formability in bending, press forming, etc. core material 1 when used in welded structures.
The comrades are butted, and both mating materials 2 with good weldability,
Since the welding is done in the second part, the welding work force becomes easier. The damping effect is exerted by the core material l.

In addition, if the thickness of the laminated material as a product is too thick, the distribution effect will be inhibited, so the thickness of the laminated material on one side should be 10 to 30%.
is appropriate, and when used in welded structures, it is desirable that the thickness be as thick as possible within the above range.

Next, specific examples of the present invention will be described.

Use FCD40 as the core material 1, and use 8 as the mating material 2 on both sides.
The three-layer structure combination 4 using No. 8418 was heated to 1100° C. and hot rolled at a rolling ratio of 4. Then A
After heating to the austenite region just above the r3 point and sufficiently holding it in the Ar1 point region, it is slowly cooled to turn the cast iron base into ferrite. An inventive implant with a diameter of 0.8+m and an overall thickness of &6 sam was obtained.

Also, the core material 1 is FCD40, and the mating material 2 on both sides is 5U84.
Using 05i, the present invention material B was obtained through 8 treatment steps similar to the present invention implantation.

Both invention materials A and B as well as flake graphite cast iron (FCl2) and spheroidal graphite cast iron (FCD40) with the same thickness as both invention materials A and B
) The results of the characteristic tests for each building are shown in the table.

As can be seen from the table, the tensile strength of the cast iron B of the present invention is significantly higher than that of flake graphite cast iron, and even in the side bending test, there was no peeling of the laminate 2 from the core material and cracking of the core material 1. This did not occur, and the allocation performance was equivalent to that of flake graphite cast iron. Furthermore, as shown in FIG. 3, it is known that its damping coefficient is superior to 18-8 stainless steel, spheroidal graphite cast iron, and extremely mild steel, and is comparable to flake graphite cast iron.

(Effects of the Invention) As understood from the above explanation, the clad plate of the present invention having cast iron as a core material has the following effects.

The graphite in cast iron, which is the core material, is flake graphite, which has a distribution effect, and the steel on both sides of the core material supplements strength, workability, and weldability. We were able to provide a clad plate suitable for parts and structures such as OA equipment.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a three-layer structure assembly for producing a solid example of a cladding plate having cast iron as a core material according to the present invention, and FIG. FIG. 3, a microscopic photograph of an example of the clad plate, is a diagram showing the relationship between the tensile strength and damping coefficient of various metal materials. 1: Core material (spheroidal graphite cast iron), 2: Steel material, 3: Plate, 4:
Three-Layered Structure Combination Agent Patent Attorney Former 1) Li 2 Figure 1 Figure 3 Hinabe Hamasa kg/mm2 Procedural Amendment April 1, 1986 Director General of the Patent Office Michibu Uga 1, Indication of the Case Patent Application No. 6320 of 1985 9 Name of the invention Relationship to the case of a person who amends a clad plate using cast iron as a core material Patent applicant Japan Steel Works, Ltd., 1-2 (421) Yurakucho-chome, Chiyoda-ku, Tokyo Representative: Naohiko Yagi Rihito 〒166 Date of amendment order: March 5, 1985 (Shipping date: March 25, 1986) -
Number of inventions increased by 1 amendment 0 7, subject of amendment 8, addition of ``of metallographic structure of cast iron'' between ``no'' and ``ken'' on page 7, line 12 of the description of the contents of the amendment. do. that's all

Claims (1)

[Claims] A cast iron characterized by excellent vibration damping properties, which is made by forming a three-layer structure assembly using spheroidal graphite cast iron as a core material and steel materials as a bonding material, and by hot rolling and pressing this three-layer structure assembly. A clad plate with core material.