JPS61231105A - Wear resistant material to be melt-joined to surface of structure - Google Patents

Abstract

PURPOSE:To obtain a wear resistant material to be melt-joined to the surface of a structure by heating a metal which can be melt-joined to the surface forming metal of the structure and two or more layers of hard alloy powder to a high temp. under pressure. CONSTITUTION:A metal which can be melt-joined to the surface forming metal of a structure and two or more layers of hard alloy powder are heated to a high temp. under pressure by directly supplying a strong electric current at a low voltage for a short time so that they are melt-bonded to each other. WC-Co, WC-TiC-Co, WC-TaC-Co or the like is used as the hard alloy.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wear-resistant material for fusion welding to the surface of a structure,
More specifically, it is applied to many structure surfaces such as conveyance roads for heavy objects, walls of shot peening and sandblasting pots where metal powder etc. are violently scattered, and processing table surfaces of workpieces. This invention relates to a platelet-shaped wear-resistant material for imparting wear resistance to.

[Prior Art] As is well known, there are many needs to provide wear resistance to the surfaces of structures such as road surfaces, floors, walls, and workpiece table surfaces.

For example, in a steelworks, steel ingots as products or materials,
In order to transfer steel materials, etc. to a predetermined location on a production or shipping line, the steel materials, etc. are transported by sliding them onto a steel transport path. As it rubs violently against heavy objects, it causes severe wear.
Naturally, road surface wear resistance is required. In this case, the above requirements could be met if the structures themselves, such as the transport road surface, were made of wear-resistant hard alloys, but this is not practical due to cost considerations, and for this reason, several techniques have been developed in the past. has been completed.

One method is to lay out a large number of small hard alloy plates one by one by soldering them onto the surface of a structure such as a steel transport road or wall.

The other method involves arranging a large number of small hard alloy plates in advance, pouring molten steel onto them, allowing the whole to solidify, and forming a large number of small hard alloy plates on the surface. This is a method of laying them out.

[Problems to be Solved by the Invention] Both of these two techniques meet the requirements of imparting wear resistance to the conveyance path surface, wall surface, etc., and are actually effective, but in the case of the first method, The small plate-shaped hard alloy plates must be soldered one by one using a metal solder, which poses a problem in that the manufacturing process is laborious and costly. In addition, since the expansion coefficients of the hard metal and the surface of the structure are different, the strain after soldering,
In addition, there are various hard metals such as WC type and TiC type, but WC type is expensive, so I would like to use TiC type, but TiC type is difficult to solder, so I use TiC type. This is not possible in actual purchase, and there are restrictions on the materials that can be used. In the case of the second method, although problems in terms of manufacturing time and cost are solved, the hard alloys that can be used are limited. In other words, when molten steel is poured onto small hard alloy plates, the hard alloy plates must not float, so only hard alloy plates with a specific gravity sufficiently higher than the molten metal can be used. Cannot do 0 e.g. WC-TiC-
In the case of Co-based hard alloys, those with a large Tic composition cannot be used.

Therefore, an object of the present invention is to provide a wear-resistant material that can be easily produced, can be easily joined to the surface of a structure by fusion welding, and is not limited by the type of hard metal used. is to provide.

[Means and effects for solving the problems] In order to achieve the above object, the present invention has the following technical means.

That is, to explain this using the numbers corresponding to the examples, this wear-resistant material 9 simultaneously pressurizes two or more layers of metal 5 and hard alloy powder 6 that can be fusion-welded to the metal on the surface of the structure. It is heated to a high temperature and formed into a base body 7 and a surface body 8 of a hard alloy powder layer that is integrally welded to the base body 7, and the surface 10 of the base body 7 is used as a conveyance road surface for heavy objects, a wall surface, or a workpiece table surface. This is a fusion welding surface for fusion welding to the surface 12 of a structure 11 such as the like, and since the transportation road surface for heavy objects and the wall surface are usually made of steel, the above-mentioned substrate is made from a layer of iron powder molded and heated. Become.

With such a configuration, this large number is distributed over the surface 1 of the structure 11.
2, the surface 10 of the base body 7 made of wear-resistant material is fusion-welded to the structure surface 12 by spot welding or the like.

According to this, the wear-resistant material itself can be molded by simply pressurizing and heating at the same time, so it can be manufactured relatively easily, and when applied to the surface of a structure, the base 7 is
For example, if the surface of a structure is normally made of steel, iron, which is similar to that, is selected because it can be easily joined to the surface of the structure by fusion welding. Construction is easy, and the hard alloy of the surface body 8 of the wear-resistant material 9 is WC-Co-based or WC-TiC-C.

system, WC-T a C-Co system, WC-Tic-Ta
C-Co type, Cr4C type, and any other type can be used, and can be used optimally depending on the purpose. In particular, W.C.
The TiC system is cheaper than the TiC system, and can be used freely, so it can be supplied to the market at a low cost.

[Example] Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 represent dice, and 3 and 4 represent punches.

The dies 1 and 2 are filled with iron powder 5, and a hard alloy powder 6 is filled thereon.

In this state, molding pressure is applied by the upper and lower punches 3 and 4, and at the same time, high temperature heating is performed. This is the so-called hot press method. The example in this figure shows an example in which the material to be formed is pressurized by a punch and simultaneously formed by the resistance heat generated between the iron powder and the hard alloy powder layer through a strong current for a short period of time. 3 and 4 are used which also serve as carbon electrodes.

In this way, when applying pressure and applying a strong current directly for a short time,
The iron powder 5 and the hard alloy powder 6 are sintered by the resistance heat generation, and at the same time, the base body 7, which is a sintered body of the iron powder 5, and the surface body 8, which is a sintered body of the hard alloy powder 6, are integrally welded to each other. do.

Figure 2 shows the wear-resistant material 9 obtained in this way.
be.

The above hard alloy powder is obtained by this method.

WC-Co based hard alloy, WC-Tic-Co based alloy, W
C-T a C-Co hard alloy, WC-TiC-T
A wide variety of hard metals such as aC-Co-based hard alloys and Cr4C can be used, and these are selected according to the wear resistance required for the surface of the structure to which they are applied. Since the structure is usually made of steel, it is common and preferable to mold iron powder as shown in this example, but molding using metal powder that can join the metals forming the structure by fusion welding Since the base body 7 supports the surface body 8, other metals that can be fusion welded to the metal may be used depending on the structure. In some cases, carbon, Tic, WC, or the like may be included in the composition to freely adjust the hardness, or stainless steel or the like may also be used.

In addition, the hardness of the surface body 8 depends on the porosity and grain size of carbides in the case of WC-Co hard alloys, and on the hardness of WC-Ti.
Attenuation in C-Co systems is affected by the amount of Tic, etc., but in this example high-temperature compression method using direct energization of residual current for a short time, it is affected by the pressure, the strength of the instantaneous current, and the energization time. Therefore, it should be determined as appropriate depending on the structure to which it is applied. However, the present invention is also possible using other molding methods as long as they are high-temperature compression methods. The above-mentioned method of directly applying a strong current to the powder to be molded for a short time is preferable because it can be molded in a short time and has great economic advantages such as not requiring a special graphite mold. However, in addition, dies 1 and 2 may be made of graphite type, high-temperature compression may be performed by directly passing a strong current through the graphite type, high-frequency induction heating, etc. Even in the case of high-temperature compression, it is better to mold in a vacuum or inert gas where it does not react with the atmosphere.

Now, the wear-resistant material 9 obtained in this way usually has a planar shape, a square (square, rectangle), or a round shape, but the surface 10 of the base 7 constituting this wear-resistant material 9 is used as a fusion welding surface. It has characteristics in points. That is, in order to fusion weld this to the surface 12 of a structure 11 such as a road surface for transporting heavy objects, the surface 12 is heated and melted in advance in a certain area, as shown in FIG. A predetermined number of consumable materials 9 are attached to the base 7.
The surface 10 of the base body 7 is enlarged and the surface 12 of the structure is fused to each other after the whole is pressed. The cut portion A in FIG. 3 shows this state as a model. Further, the wear-resistant material 9 is placed on the surface 12 of the structure, and both are pressed, and the surface 10 of the base 7 and the surface 12 of the structure are partially spot fused and integrated. Cut portion B in FIG. 3 is a model representation of this state. In these cases, the metal material of the base 7 of the wear-resistant material 9, for example iron, and the metal material of the structure 11, for example steel, are of the same type, so there is no need for a third brazing rod, soldering material, etc. It can be constructed. Therefore, in the example in progress, metal 5 and hard metal 6 that can be fusion welded to the surface of the structure
Although an example is shown in which two layers are molded, as shown in FIG. 4, another metal 13 such as Cu powder may be interposed between the metal 5 and the hard metal 6 for molding.

Examples of the structure surface 12 include a conveyance road surface for heavy objects, a wall surface in a shot blasting or sandblasting factory, a table surface on which a workpiece is placed in a machine tool, and the like. Also, when fusion welding to the surface of a structure, this plate-shaped wear-resistant material is
A block of ~40 blocks may be welded in advance to a plate of a certain size, and this block plate may be attached to a structure with bolts and nuts.

Next, one specific example will be disclosed.

Iron powder (Fe) is placed between punches 3 and 4 which also serve as carbon electrodes.
Then, the next step Wc -T f C (30-7 layer%
) and 20% Ni and pressurized with 20 Kg/am'' by both punches 3.4, and at the same time, a strong current of 3.0 OOA was applied between both punches 3 and 4. By applying electricity for a minute, a wear-resistant material with a thickness of the base 6 of 5+wm, a thickness of the surface body 7 integrally welded to the base of 2.5cm, a total thickness of 7.5mm, a width of 20mm, and a length of 20ts was obtained. Ta.

A large number of these were fusion welded to the surface of a steel conveyance road made of steel at a steel mill.

The Rockwell hardness (HRA) of the wear-resistant material surface 8 is 8.
8 to 80, and when a heavy steel material was slid on its surface, sufficient wear resistance was exhibited, and the durability of the conveyance road main body was able to be significantly improved.

[Effects of the Invention] As detailed above, this wear-resistant material can be used on surfaces of structures such as transportation roads for heavy objects, walls, ceilings, and table surfaces of workpieces where metal powder is violently scattered, such as in shot peening and sandblasting factories. Two or more layers of metal and hard alloy powder that can be fused to metal are pressed and heated at high temperature to form a small plate of a base and a hard alloy surface that is integrally welded to the base. In particular, the base of this plate-like molded product is a metal that can be fused to the metal on the surface of the structure, so specifically, the surface of the structure is In this case, the base material is the same steel as the steel material, so when joining it to the surface of the structure, it can be joined integrally simply by fusion welding, and construction is extremely easy. In addition, since the hard metal of the surface of this wear-resistant material is not subject to any limitations in processing, various materials can be selected depending on the application, and it has considerable practical advantages such as a remarkable degree of processing freedom. .

[Brief explanation of drawings]

The attached drawings show embodiments of the present invention, with Fig. 1 showing high-temperature compression molding, Fig. 2 a cross-sectional view of the molded wear-resistant material, and Fig. 3 showing the wear-resistant material on the surface of the structure. FIG. 4 is a diagram showing another embodiment of the welding of wear materials. In the figure, 5 is iron powder, 6 is hard alloy powder, 7 is base body, 8 is surface body, 9 is wear-resistant material, 10 is the surface of the base, 11 is the structure, and 12 is the surface of the structure. It is often applied to the surfaces of structures such as the walls of workpiece peening and sandblasting factories, where metal powder, etc. are violently scattered, and the processing table surfaces of workpieces. Regarding plate-shaped wear-resistant materials. [Prior Art 1] As is well known, there are many needs to provide wear resistance to the surfaces of structures such as road surfaces, floors, walls, and workpiece table surfaces. For example, in a steelworks, steel ingots as products or materials,
In order to transfer steel materials, etc. to a predetermined location on a production or shipping line, the steel materials, etc. are transported by sliding them onto a steel transport path. As it rubs violently against heavy objects, it causes severe wear.
Naturally, road surface wear resistance is required. In this case, the above requirements could be met if the structures themselves, such as the transport road surface, were made of wear-resistant hard alloys, but this is not practical due to cost considerations, and for this reason, several techniques have been developed in the past. has been completed. One method is to lay out a large number of small hard alloy plates one by one by soldering them onto the surface of a structure such as a steel transport road or wall. The other method is to arrange a large number of small plate-shaped hard alloy plates in advance, pour molten steel over them, and solidify the whole in that state, so that many small plate-shaped hard alloy plates are formed on one surface. This is a method of laying out the [Problems to be Solved by the Invention] Both of these two techniques meet the requirements of imparting wear resistance to the conveyance path surface, wall surface, etc., and are actually effective, but in the case of the first method, The small plate-shaped hard alloy plates must be soldered one by one using a metal solder, which poses a problem in that the manufacturing process is laborious and costly. In addition, since the expansion coefficients of the hard metal and the surface of the structure are different, the strain after soldering,
There are various types of hard metals that are prone to cracking, such as WC type and TiC type, but WC type is expensive, so we would like to use TiC type, but TiC type is difficult to solder, so TiC type is used.
It is virtually impossible to use C-based materials, and there are restrictions on the materials that can be used. In the case of the second method, although problems in terms of manufacturing time and cost are solved, the hard alloys that can be used are limited. In other words, when molten steel is poured onto small hard alloy plates, the hard alloy plates must not float, so only hard alloy plates with a specific gravity sufficiently higher than the molten metal can be used. Not possible 0 For example, WC-T
In the case of ic-Co-based hard alloys, those with a large TiC composition cannot be used. Therefore, an object of the present invention is to provide a wear-resistant material for fusion welding to the surface of a structure that is easy to manufacture, can be easily joined to the surface of a structure by fusion welding, and is not limited by the type of hard metal used. is to provide. [Means 9 Effects for Solving the Problems] The present invention has the following technical means for achieving the above object. That is, to explain this using the reference numerals corresponding to the examples, this wear-resistant material 9 directly presses two or more layers of metal 5 and hard alloy powder 6 that can be fusion-welded to the metal on the surface of the structure. The surface 10 of the base 7 is formed by heating at high temperature through low voltage and strong current for a short period of time in an energizing method to form a base 7 and a surface body 8 of a hard alloy powder layer that is integrally welded thereto.
is used as a fusion welding surface for fusion welding to the surface 12 of a structure 11 such as a conveyance path for heavy objects, a wall surface, a workpiece table surface, etc. Since the conveyance path for heavy objects and the wall surface are usually made of steel, the above-mentioned The base consists of a layer of iron powder molded and heated. With such a configuration, this large number is distributed over the surface 1 of the structure 11.
2, the surface 10 of the base body 7 made of wear-resistant material is fusion-welded to the structure surface 12 by spot welding or the like. According to this, the wear-resistant material itself can be molded by simply pressurizing and heating at the same time, so it can be manufactured relatively easily, and when applied to the surface of a structure, the base 7 is
For example, if the surface of a structure is normally made of steel, iron, which is similar to that, is selected because it can be easily joined to the surface of the structure by fusion welding. Construction is easy, and the hard alloy of the surface body 8 of the wear-resistant material 9 is WC-Co-based, WC-TiC-Co-based,
WC-T a C-Co system, WC-Tic-TaC-
Co-based, Cr4C-based, and any other materials can be used, and can be used optimally depending on the application. In particular, compared to the WC system, the TiC system is cheaper and can be freely used, so it can be supplied to the market at a low cost. [Embodiments] Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 represent dice, and 3 and 4 represent punches. The dies l and z are filled with iron powder 5, and then hard alloy powder 6 is filled thereon. In this state, molding pressure is applied by the upper and lower punches 3 and 4, and at the same time, high temperature heating is performed. That is, the material to be molded is pressurized by a punch and at the same time, a strong current is passed directly for a short period of time to form the material by the resistance heat generated between the iron powder and the hard alloy powder layer. As the upper and lower punches 3 and 4, punches that also serve as carbon electrodes are used. In this way, when applying pressure and applying a strong current directly for a short time,
Although current flows uniformly in each part of both the layer of iron powder 5 and the layer of hard alloy powder 6, since the electrical resistance value of the layer of hard alloy powder is high, a high temperature is generated in that part, and as a result, the iron powder 5
At the same time as the hard alloy powder 6 is sintered, the base body 7, which is a sintered body of the iron powder 5, and the surface body 8, which is a sintered body of the hard alloy powder 6, are integrally welded to each other. FIG. 2 shows the wear-resistant material 9 thus obtained. In this method, the hard alloy powder is WC
-Co-based hard alloy, -WC-TiC-C. system alloy, W C-T a C-Co system hard alloy, wc-
A wide variety of materials can be used, such as T i C-Ta C-Co hard alloys and hard metals such as Cr4C. These are selected according to the wear resistance required for the surface of the structure to which they are applied, and on the other hand, the base 7 is generally made of iron powder, as shown in this example, since the structure is usually made of steel. However, it is preferable to choose a structure in which the metal forming the structure is molded using metal powder that can be joined by fusion welding. Metal may be used, and since this base body 7 supports the surface body 8, if it is iron-based, carbon, TiC1, WC, etc. may be included in its composition to freely adjust its hardness. It may be adjusted, and stainless steel or the like may also be used. In addition, the hardness of the surface body 8 depends on the porosity and grain size of carbides in the case of WC-Co hard alloys, and on the hardness of WC-Ti.
In the c-Co system, it is affected by the amount of TiC, etc., but in this direct energization method that uses direct energization with a strong current for a short time, it is affected by the pressure, the strength of the instantaneous current, and the energization time. Therefore, it is determined as appropriate depending on the structure to which it is applied. In the case of this method of directly applying a strong current to the powder to be molded for a short time, it is possible to mold the powder in a short time,
It has been confirmed that it is suitable because it has great economical advantages such as not requiring a special graphite mold, but it is also possible to use graphite molds for dies 1 and 2, and to apply a strong current directly to the graphite molds to heat them at high temperatures. In vacuum, which can be compressed and does not react with the atmosphere,
It is better to mold in an inert gas. Now, the wear-resistant material 9 thus obtained is usually planar, square (rectangular, rectangular), or round, but the surface of the base 7 constituting this wear-resistant material 9! The feature is that 0 is used as the fusion welding surface. That is, in order to fusion weld this to the surface 12 of a structure 11 such as a road surface for transporting heavy objects, the surface 12 is heated and melted in advance in a certain area, as shown in FIG. A predetermined number of wear materials 9 are attached to the base body 7.
The surface 10 of the base body 7 is enlarged and a suitable device is applied, the whole is pressed, and the surface 10 of the base body 7 and the surface 12 of the structure are fused together. The cut portion A in FIG. 3 shows this state as a model. Further, the wear-resistant material 9 is placed on the surface 12 of the structure and pressed together, and the surface 1o of the base 7 and the surface 12 of the structure are partially spot fused and integrated. Cut portion B in FIG. 3 is a model representation of this state. In these cases, the metal material of the base 7 of the wear-resistant material 9, for example iron, and the metal material of the structure 11, for example steel, are of the same type, so there is no need for a third brazing rod, soldering material, etc. It can be constructed. In the following example, we have shown an example in which two layers of metal 5 and hard metal 6 that can be fusion welded are formed on the surface of the structure, but as shown in FIG. Molding may also be performed with a layer of other metal 13 such as powder interposed therebetween. Examples of the structure surface 12 include a conveyance road surface for heavy objects, a wall surface in a shot peening or sandblasting factory, a table surface on which a workpiece is placed in a machine tool, and the like. Also, when fusion welding to the surface of a structure, this plate-shaped wear-resistant material is
-40 blocks may be welded in advance to a plate of a certain size, and this block plate may be attached to a structure with bolts and nuts. Next, one specific example will be disclosed. Iron powder (F e
), then TE wc-”r i C(30-70
%) and 20% Ni alloy powder. Both punches 3.4 pressurize at 20 kg/c rn" and at the same time a strong current of 3.00 O is applied between each punch 3 and 4.
By applying current A for 2 minutes, the 5cm thick layer of the base 6 is integrally melted into the base! The thickness of the surface body 7 is 2.5 l.
A wear-resistant material with a total thickness of 7.51 mm, a radius of 2 Gmm, and a length of 20 m was obtained. A large number of these were fusion welded to the surface of a steel transport road made of steel at a steel mill. The Rockwell hardness (IrA) of the surface body 8 of the wear-resistant material is 88 to 8o, and when a heavy steel material is slid on the surface, it exhibits sufficient wear resistance, and We were able to significantly improve durability. [Effects of the Invention] As detailed above, this wear-resistant material can be used on surfaces of structures such as transportation roads for heavy objects, walls, ceilings, and table surfaces of workpieces where metal powder is violently scattered, such as in shot peening and sandblasting factories. Two or more layers of metal and hard alloy powder are fused together by fusion welding, and at the same time they are pressed and simultaneously heated directly at high temperature through a short period of low voltage and strong current, the hard alloy is integrally welded to the base. Since the surface body is molded into a small plate shape, it can be easily processed, and in particular, the base of this plate-like molded product is a metal that can be fusion-welded to the metal on the surface of the structure. The surface of the structure is mostly made of steel, and in this case the base material is selected to be the same steel.
When joining this to the surface of a structure, it can be integrally joined simply by fusion welding, and construction is extremely easy.
In addition, the hard metal of the surface of this wear-resistant material is not subject to any restrictions in processing, so a variety of materials can be selected depending on the application.
It exhibits moderate practical advantages such as a remarkable degree of processing freedom. 4. Brief description of the drawings The attached drawings show embodiments of the present invention. Fig. 1 is a diagram showing high temperature compression molding, Fig. 2 is a cross-sectional view of the molded wear-resistant material, and Fig. 3 4 is a diagram showing a place where this wear-resistant material is fusion-welded to the surface of a structure, and FIG. 4 is a diagram of another embodiment. In the figure, 5 is iron powder, 6 is hard alloy powder, 7 is a base body, and 8 is a surface body. , 9 is a wear-resistant material, IO is the surface of the base, 11 is the structure, and 12 is the surface of the structure.

Claims (1)

[Claims] A small plate-shaped wear-resistant material that is arranged in large numbers on the surface of structures such as transportation routes for heavy objects, walls where metal powder is violently scattered, and workpiece processing tables to provide wear resistance to the entire surface of the structure. This wear-resistant material is made by pressurizing and heating two or more layers of metal and hard alloy powder, which can be fused to the metal on the surface of the structure, to a base and a hard alloy that can be integrally welded to it. A wear-resistant material for fusion welding to the surface of a structure, characterized in that it is formed into a small plate shape of an alloy surface body, and the surface of the base body is used as a fusion weld surface for fusion welding to the surface of the structure.