JPS6141695B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a 50 mm wide
mm~200mm, thickness 4mm~16mm, length practically 1000mm
Wear-resistant composite steel plates are used for equipment, machinery, etc., using wear-resistant composite steel plates, which are made by applying wear-resistant metal overlays 2 using welding wire on steel plates 1 with excellent toughness and good weldability up to around 1.0 mm. How to repair parts that require strength,
and the above-mentioned repair parts.

Industrial machinery for manufacturing steel, cement, coke, etc., mining machinery for crushing stone, alloy powder, etc., and other construction and civil engineering machinery are generally subject to severe abrasive wear and maintenance is currently difficult.

Conventionally, the repair of worn parts of these devices, machines, etc. has been carried out by applying metal overlay to the parts or pasting wear-resistant cast steel blocks on top of them. When repairing a worn bucket of a large excavator at a construction site, if the bucket cannot be welded in a downward welding position because it is difficult to remove it from the main body, repair is extremely difficult, and even if there is no problem with the posture, the wear-resistant metal Difficulties in depositing on high alloy steel such as, etc.
There are problems such as distortion occurring due to the deposit. In addition, the latter has disadvantages in that it requires a lot of effort, time, and cost, such as having to be lathed to fit the shape of the worn part or attached using mechanical joining methods.

In view of the above-mentioned current situation, an object of the present invention is to provide a welding repair method and repair parts that can be easily carried out on a work site, etc., and on worn parts in any posture and position. be.

The present invention repairs a wear-resistant composite steel plate, which is made by depositing wear-resistant metal on a base steel plate with excellent toughness and good weldability, leaving narrow edges along both sides of the base steel plate, where the base metal remains intact. used as parts.

The present invention provides the required number of repair parts such that the wear resistance of the equipment, machinery, etc. is such that the extending direction of the narrow edge of the base material is approximately perpendicular to the flow direction of the abrasive media in contact with the surface. It is characterized by being placed and attached to the required part, using lightweight repair parts, and since the parts have edges that are made of easily weldable steel plates, it can be installed in any posture or position. It can be easily attached by welding to worn parts of
It has the advantage of greatly reducing man-hours and costs, and almost eliminates the occurrence of welding distortion unlike the direct metallization method.Additionally, due to the toughness of the base metal, repairs can be made that are extremely resistant to heavy impact. be.

The first part showing the repair parts used in the method of the present invention
In the figure, 1 is the base material, 2 is the wear-resistant metal deposited on it, 3 is the narrow edge of the base material on both sides, and 4 is the groove provided on the end face of the edge. In Figure 1, A shows a groove with an upward slope that intersects the extending direction of the edge, B shows a groove with a downward slope, and C shows a groove with an upward and downward slope. Examples of each form are shown below.

The material of the base material 1 is not particularly limited, but it is best to use low carbon steel, medium carbon steel, mild steel, etc., which have excellent toughness and good weldability.If particularly strong strength is required, select 50 to 60 kg/mm ^2nd class high tensile steel. It's okay. The metal layer 2 is preferably a surface hardened wire for welding, such as martensitic wire such as JIS, DF2B, etc., which precipitates hypereutectoid carbide, and if necessary, Cr, W, Mo, Ti, etc.
A welding wire containing one or more of high hardness carbide forming elements such as B, Nb, and V is used.

In order to make the base material 1 of the repair parts as light as possible and for convenience of work handling, the thickness of the base material 1 is 4 to 4.
It should be 16mm, width 50-200mm, length around 1000mm or less, but there is no limitation. The thickness of the metal layer 2 is set to a required thickness using a single layer metal layer or two or more layers of metal layer. Further, the groove 4 does not need to be particularly provided when the base material 1 has a thin thickness of 4 to 7 mm.

The present inventor previously developed
Using JISDF2B martensitic welding wire, we succeeded in manufacturing a wear-resistant composite steel plate for repair by applying a layer of overlay to a height of 5 mm, and applied for a patent on the manufacturing method. , special public service 1984-
31430, the part manufactured by the same method has a thin wall,
It is extremely lightweight and easy to handle, yet is strong and has sufficient wear resistance as a repair part for shoot liners, hopper sockets, etc. used in the cement, coke sintering, and ferroalloy industries.

As described above, the repair method of the present invention involves repairing a component made of wear-resistant composite steel plate as described above, such that the extending direction of the edge 3 of the base material is approximately in the flow direction of the abrasive medium in contact with the surface. They are arranged perpendicularly in the area requiring repair, and when multiple parts are required, their three edges are butt-joined so that the extending direction of the edges is approximately perpendicular to the flow direction of the abrasive media. It is characterized in that it is arranged in such a manner that it is attached to said portion by welding.

That is, if we take a sintered coke hopper as an example, as shown in the longitudinal side view of FIG. Wear-resistant composite steel plate (repair parts) on the inner surface of the socket 5
The sintered coke 8 is attached so that the extending direction of the edge 3, which remains the base material, is substantially perpendicular to the flowing direction (arrow) of the sintered coke 8.

In this case, in order to cover the parts requiring protection or repair of the hopper socket with the repair parts 5, a large number of repair parts are butt welded 9 to each other along the edges 3 of the base metal. , forming a continuous and wide wear-resistant surface.

When repairing such a large area using conventional overlay methods, for example, it not only takes a lot of work but also always causes welding distortion, but with this method, repair parts The wear-resistant composite steel plate has an edge 3 that is the same as the base material and is easy to weld.
By simply welding along the edges of the part, wear-resistant plates with an area of 1 m square, 2 m square, or more can be produced as needed with great ease and with almost no distortion. It is.

In order to attach a wear-resistant plate with this required area and shape to a part where wear resistance is required, such as the inside of a hopper, it is not necessary to weld the entire edge of the plate. It is only necessary to perform partial welding 10 at appropriate intervals along the edge of the base material. Furthermore, during installation, as mentioned earlier, the direction of extension of the base material 3 of the wear-resistant plate is arranged to be approximately perpendicular to the flow direction of the abrasive media such as sintered coke 8. By doing so, since the edge 3 is a narrow recess between the wear-resistant metal plates 2 of the wear-resistant composite steel plate, it has an opportunity to be abraded by abrasive media such as sintered coke flowing on the surface in the direction of the arrow. Moreover, a part of the abrasive medium remains in the recess, and most of the abrasive medium flows over it, so that the edge 3 is coated with the base metal or wear-resistant material. In addition to the above-mentioned self-lining effect, even if the normal weld metal is exposed, it is protected from wear.

The width R of the edge of the base metal of the repair parts used in this method is determined based on the height of the excess buildup, taking into account welding along the groove or welding for attachment to the area requiring repair. 4
In the case of mm to 12 mm, 3 mm to 9 mm is appropriate.

Next, examples of repairs using this method and their effects will be described.

At a cement factory that manufactures lightweight aggregate for high-rise construction, this method was used to repair the hopper socket of the conveyor that conveys the aggregate after firing in a rotary kiln. The hopper socket was made of S45C carbon steel plate with a plate thickness of 9 mm, but the collision surface inside the hopper socket, where the aggregate falls from the conveyor, wore out and formed holes in about a month.

Therefore, we used a 6 mm thick and 100 mm wide SS41 steel plate as the base material, and added 3.5% C, 1.7% Si, 1.8% Mn, and 15% Cr.
A wear-resistant composite steel plate with surface-hardening metal (hardness HRC55-57) of the composition 5mm thick is cut as a repair part according to the inner dimensions of the hopper, and the required number of sheets are butted together to form a D-4316 low A wear-resistant plate connected with a hydrogen-based mild steel welding rod is pasted on the inner surface of the socket as shown in Figure 2 above, with the extending direction of the edge of the base metal perpendicular to the falling direction of the aggregate. After 7 months of use, the wear-resistant metal plate at the part that collided with the aggregate had worn only about 1 mm, so it took about 35 months with a 5 mm thickness, or about 35 times as long as the conventional 9 mm thick S45C steel plate. Therefore, it is possible to have a service life of .

[Brief explanation of the drawing]

Figure 1 A, B, and C are perspective views illustrating repair parts made of wear-resistant composite steel plates used in the repair method of the present invention, and Figure 2 shows an embodiment of the repair method of the present invention. FIG. 3 is a longitudinal sectional side view of the portion and a perspective view illustrating how to attach repair parts in the method of the present invention. 1: Base material, 2: Wear-resistant metal overlay, 3: Edge of base material, 4: Bevel, 5: Wear-resistant composite steel plate (repair parts), 6: Hopper, 7: Belt conveyor, 8: Sintered coke (grinding wear medium), 9: Butt welding, 10: Installation welding.

Claims (1)

[Scope of Claims] 1. A wear-resistant steel plate that is made by depositing wear-resistant metal in advance on a base steel plate with excellent toughness and good weldability, leaving narrow edges that remain as the base metal along both sides. composite steel plate,
The extending direction of the narrow edge is approximately perpendicular to the flow direction of the abrasive media in contact with the surface, and when a plurality of wear-resistant composite steel plates are required, the base It is characterized in that it is attached to the part by butt welding the raw edges of the material, and arranging the extension direction of the edges to be substantially perpendicular to the flow direction of the abrasive medium in contact with the surface. A method of repairing parts of equipment, machinery, etc. that require wear resistance. 2. On a base steel plate with excellent toughness and good weldability, a wear-resistant metal is applied along both sides leaving narrow edges that remain as the base metal. the end face perpendicular to its extending direction or/
and a repair part for parts of equipment and machinery that require wear resistance, characterized by having a downwardly inclined welding groove formed therein.