TWI690413B - Corrugating roller and fabrication method thereof - Google Patents

Abstract

Provided is a corrugating roller and a method for the fabrication of the same, capable of enhancing the longevity of the corrugating roller having tooth-shaped corrugated ridges and significantly increasing the recycling and reuse of the corrugating roller by further grinding the roller body. A build-up welding layer of high carbon steel or alloy steel deposited at a thickness of 1 mm to 10 mm by a laser build-up welding process extends over an entirety of a surface of a corrugated ridge portion or concave and convex surfaces of a substrate of the corrugating roller.

Description

Corrugated roller and its manufacturing method

The present invention relates to a corrugated roller having a tooth-shaped corrugated ridge for corrugating cardboard core paper into a wavy shape and a manufacturing method thereof.

The wave shape of the corrugated cardboard is to set two corrugated rolls with tooth-shaped corrugated ridges into a meshed state, and pass the core paper through the meshed portion, thereby producing a sheet formed into a wavy shape. The toothed corrugated ridges of the two corrugated rollers that are in mesh with each other are formed to extend horizontally with respect to the direction in which the core paper passes. The core paper is drawn into the meshing part of the upper and lower corrugated rolls while sliding on the corrugated ridges, so the corrugated ridges of the corrugated rolls are prone to wear due to friction and wear. In addition, in some cases, when the core paper is pulled in, a concave-like deformation may occur in the corrugated ridge due to biting of foreign matter. When the amount of wear of the corrugated ridge becomes larger, or when the corrugated ridge is dented, the formation of the wavy shape becomes defective, reaching the service life of the corrugated roll.

Therefore, in order to extend the life of the corrugated roll, it is known to coat the surface of the corrugated roll with a hard chrome plating layer to improve the wear resistance. In addition, as a countermeasure against the depression of the corrugated ridge portion, it is known to make the hardness of the corrugated roller substrate of the corrugated ridge portion to Vickers hardness 680 or more.

When the corrugated roll reaches the end of its service life due to wear or dents, the damaged part is removed by regrind, thereby regenerating the corrugated ridge shape of the tooth shape. However, since the roll diameter becomes smaller by regrind, it is necessary to adjust the shape of the corrugated ridge to maintain the meshing of the upper and lower corrugated rolls at an optimal level. In the regenerating method of corrugated rolls by regrinding, the diameter becomes smaller as the number of repetitive regenerations is repeated, so the number of regenerations by regrinding is limited to about three times.

Patent Document 1 shows the relationship between the hardness of the corrugated ridge portion (Shore hardness Hs) of the actual machine corrugated roll that has reached the end of its service life and the number of depressions, as long as the hardness Hs of the corrugated roll base is made If Hs>80, the depression (ie, indentation) can be made almost zero. In addition, a method of making the hardness of the corrugated roller substrate Hs>80 by implementing a combined heat treatment method using a carburizing and nitriding method and heat quenching is shown. Furthermore, for the purpose of improving the abrasion resistance, a technique is proposed in which a hard chromium plating layer, a diamond film, or a WC-Co spray film is coated on the surface of a corrugated roller substrate with high hardness.

In Patent Document 2, for the purpose of improving the wear resistance, a carbide-based cermet (cermet) such as WC-Co is sprayed on the surface of a steel corrugated roller substrate with a high-speed combustion gas flame. A method of manufacturing corrugated rolls on the surface of the spray film by electroless plating such as Ni-P.

In Patent Document 3, for the purpose of regenerating corrugated rolls, it is proposed that a high-hardness surfacing layer thicker than the depth of the corrugated ridges and having a Shore hardness Hs of 80 or more be melted and formed on the corrugated roll base, and the excess thickness is cut With the technology of processing into a predetermined size.

[Previous Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open No. 8-602509

Patent Document 2: Japanese Patent Laid-Open No. 9-262915

Patent Document 3: Japanese Patent Laid-Open No. 1-177956

Although Patent Document 1 proposes a method of coating hard chromium plating on the surface of a corrugated roll substrate with high hardness for the purpose of improving wear resistance, it is necessary to use nitridation to coat hard chromium plating. The treatment or carburizing and nitriding treatment or quenching treatment and tempering treatment can make the surface of the corrugated roll substrate harder, resulting in a complicated process for the corrugated roll. In addition, when the corrugated roller has reached the end of its service life, if the worn part is removed by regrind, there are the following disadvantages: the treatment of making the surface of the corrugated roller substrate harder is required again, and The number of regenerations by grinding is also limited to about three.

In addition, as in Patent Document 1 or Patent Document 2, a method of coating a diamond film or a WC-Co sprayed film on the surface of the corrugated roller substrate is such that even if the film itself has excellent abrasion resistance, if the adhesion to the corrugated roller substrate is not Sufficiently, it is still impossible to achieve the expected extension of the service life due to the main causes other than wear, such as the generation of cracks in the film or peeling of the film.

Furthermore, when using the corrugated roller regenerated by the method described in Patent Document 3, the corrugated ridges are easily damaged due to the involvement of oxides or welding defects that are considered to be mixed during the build-up welding, and The service life will be much shorter than the new corrugated roller.

The present invention was developed in view of such a problem, and its purpose is to deposit a laser surfacing layer (while supplying metal powder to the surface of the corrugated roller substrate, while irradiating the laser, The metal powder on the surface of the corrugated roll base is melted, and then cooled and solidified and deposited in sequence (a metal stacking method) is formed on the surface of the corrugated roll base. The excellent coating layer prevents the shortening of the service life due to not only the wear but also the main causes other than the wear, and achieves a longer service life of the corrugated roller.

In addition, the object of the present invention is to form a high-carbon steel or alloy that is easily hardened by quenching by laser surfacing in order to increase the hardness of the surface of the corrugated roller substrate that is the base of hard chrome plating. Steel can easily regenerate corrugated rollers that are worn and damaged due to use.

The present invention has been carefully reviewed to solve the aforementioned problems, and as a result, the following means have been adopted. In this specification, a corrugated roll base system means a corrugated roll having a toothed corrugated ridge that corrugates the core paper for corrugated paperboard on the outer periphery of the roll, and means that none of the corrugated roll is applied to improve Corrugated rollers with physical and chemical treatments such as abrasion-resistant layer or hardened layer to increase the hardness of the surface of corrugated roller.

(1) The corrugated roller of the first invention is formed on the outer periphery of the roller with a corrugated corrugated ridge that corrugates the core paper of the corrugated cardboard into a corrugated shape. The entire surface has a build-up layer of high-carbon steel or alloy steel with a thickness of 1 mm to 10 mm formed by laser build-up welding.

(2) The corrugated roller of the second invention is formed on the outer periphery of the roller with a corrugated corrugated ridge that forms the core paper of corrugated cardboard into a wave shape, in which: the corrugated roller ridge surface or the unevenness of the corrugated roller base body The entire surface has a high wear-resistant coating layer composed of high-carbon steel or alloy steel and carbide formed by laser surfacing and having a thickness of 0.1 mm to 3 mm.

(3) The corrugated roller of the third invention is the first or second invention, in which the corrugated roller base system is hardened in advance by nitriding treatment or carburizing nitriding treatment or quenching treatment and tempering treatment.

(4) The corrugated roller of the fourth invention is the second or third invention, wherein the high wear-resistant coating layer is composed of tungsten carbide and molybdenum containing 5 to 30% by weight , Titanium carbide (titanium), niobium carbide (niobium) and zirconium carbide (zirconium) one or two or more, the rest is made of high carbon steel or alloy steel containing more than 0.3% by weight of carbon.

(5) The corrugated roll of the fifth invention is any one of the first to fourth inventions, in which the surface is further coated with a hard chrome plating layer having a thickness of 10 μm to 200 μm.

(6) The corrugated roller of the sixth invention is any one of the first to fifth inventions, wherein the laser surfacing method is implemented in an inert gas environment.

(7) A method for manufacturing a corrugated roll of the seventh invention, wherein a corrugated roll base surface on which the core paper of the corrugated cardboard is formed into a corrugated corrugated ridge is formed on the outer periphery of the roll, and an average particle diameter of 20 μm is supplied Powder of high carbon steel or alloy steel up to 150 μm, while irradiating laser to form a molten pool composed of the above powder components on the surface of the corrugated roller base, and implement the powder along the tooth shape of the corrugated roller base Supply and laser irradiation, thereby sequentially solidifying the molten pool to form one or more build-up layers.

(8) A method for manufacturing a corrugated roller of the eighth invention, wherein the surface of the corrugated roller substrate on which the core paper of the corrugated cardboard is formed into a wave-shaped corrugated ridge is formed on the outer periphery of the roller, and the average particle diameter is 20 μm High-carbon steel or alloy steel and carbide mixed powder up to 150μm, while irradiating laser to form the above-mentioned mixed powder component on the surface of corrugated roller base The molten pool, and the supply of the mixed powder and laser irradiation are performed along the tooth shape of the corrugated roller base body, thereby sequentially solidifying the molten pool to form one or more layers of laser surfacing.

(9) The method of manufacturing the corrugated roller of the ninth invention is the seventh or eighth invention, wherein the corrugated roller substrate is subjected to nitriding treatment or carburizing nitriding treatment or quenching before the laser irradiation Treatment and tempering treatment to give hardening treatment.

(10) The method for manufacturing a corrugated roller of the tenth invention is any one of the seventh to ninth inventions, wherein the surface is treated with a hard chromium plating layer with a thickness of 10 μm to 200 μm.

(11) The manufacturing method of the corrugated roller of the eleventh invention is any one of the seventh to tenth inventions, wherein the laser irradiation is carried out under an inert gas environment.

According to the first invention, since the hardening effect caused by rapid heating and cooling during laser surfacing can be used to increase the hardness of the surfacing layer, even if foreign substances are bitten into when the core paper is pulled in, it is still not easy to be in the corrugated wave The ridge is dented, and the life of the corrugated roller can be increased.

According to the second invention, since all of the corrugated roll ridge surface or the uneven surface of the corrugated roll base has a thickness of 0.1 mm composed of high carbon steel or alloy steel and carbide formed by laser surfacing The coating layer with high wear resistance up to 3mm can form a coating layer with high abrasion resistance and hardness and high adhesion to the corrugated roll base, and it is possible to prolong the service life of the corrugated roll.

According to the third and ninth inventions, since the corrugated roller base system is hardened in advance by nitriding treatment or carburizing treatment or quenching treatment and tempering treatment, it is superior to the first or second invention in plastic deformation resistance Therefore, it is possible to make the corrugated roller use longer.

According to the fourth invention, since the highly wear-resistant coating layer is composed of one or more of tungsten carbide, molybdenum carbide, titanium carbide, niobium carbide and zirconium carbide containing 5 to 30% by weight, the rest is It is composed of high-carbon steel or alloy steel with 0.3% by weight or more of carbon, so by using the quenching effect caused by rapid heating and cooling during laser surfacing, the matrix as a highly wear-resistant coating (matrix) can be improved ) Of the high-carbon steel or alloy steel itself, and because the high-carbon steel or alloy steel with the matrix of the high-wear coating is fused with the steel of the corrugated roller matrix, the high-wear coating can be improved Adhesion to the corrugated roll base, and the hardness and abrasion resistance can be further improved by the above-mentioned carbide ceramics, so the life of the corrugated roll can be further increased.

According to the fifth and tenth inventions, the surface of the build-up welding layer is further coated with a hard chromium plating layer with a thickness of 10 μm to 200 μm having high hardness and excellent wear resistance and lubricity, so that the core paper can be reduced to slide on the corrugated side The ridge portion is worn while being pulled in, and the corrugated roller can be used for a longer period of time.

According to the sixth and eleventh inventions, the laser surfacing method is carried out under an inert gas environment, so that it is possible to form a surfacing layer with a small amount of oxides involved, and it is possible to prolong the life of the corrugated roller.

According to the seventh invention, since the particle diameter of the powder is 20 μm to 150 μm, the powder can be smoothly supplied without clogging, so that the thickness control of the build-up welding layer is easy, and the surface roughness of the build-up welding layer can also be smoothed. Moreover, by supplying powder and laser irradiation along the tooth shape of the corrugated roll base, it is possible to obtain a high hardness surfacing layer by quenching and hardening caused by rapid solidification of the molten pool, and the corrugated roll The steel of the base body is also illuminated by the laser (irradiation spot) passes, accepts the effect of heat treatment by rapid heating and cooling to improve the hardness.

According to the eighth invention, since the particle diameter of the mixed powder is 20 μm to 150 μm, the powder can be smoothly supplied without clogging, so the thickness control of the build-up welding layer is easy, and the surface of the build-up welding layer can also be roughened Degrees smooth. In addition, by supplying mixed powder and laser irradiation along the tooth shape of the corrugated roller base, it is possible to obtain a high-hardness surfacing layer by quenching and hardening caused by rapid solidification of the molten pool, and the corrugated roller The steel material of the base body also receives the effect of heat treatment caused by rapid heating and cooling through the passage of the laser irradiation spot to improve the effect of hardness.

According to the first to eleventh inventions, not only when the corrugated roll is newly manufactured, but also when the corrugated roll that has been worn and damaged is regenerated, the same effect can be expected.

1‧‧‧SCM440 equivalent material

2‧‧‧WC particles

Figure 1 shows that the surface of the alloy steel hardened by quenching and tempering in advance has a high wear resistance composed of a mixed powder of alloy steel and WC formed by laser surfacing The cross-sectional structure of the laser surfacing layer of the inventive example 3 and the inventive example 4 of the coating layer, and the surface of the alloy steel hardened by the quenching and tempering treatment in advance are formed by the laser surfacing method A photograph of the cross-sectional structure of the laser surfacing layer of Example 5 of the present invention, which is a highly wear-resistant coating composed of alloy steel powder.

Figure 2 is a schematic diagram showing the relationship between the content of tungsten carbide in the mixed powder of alloy steel and tungsten carbide and the hardness of the coating film.

Although the embodiments of the present invention are described below, of course, various changes or corrections can be made without departing from the technical scope of the present invention.

Corrugated rolls with toothed corrugated ridges for forming corrugated cardboard corrugated board reach the end of their service life. They are abrasion caused by the meshing part of the upper and lower corrugated rolls, and bite foreign objects by pulling in the core paper. There are two types of concave deformation of the corrugated ridge, and the tooth-shaped corrugated ridge forming the corrugated roll requires a material that is excellent in both abrasion resistance and deformation resistance. When the wear-resistant layer is coated on the surface of the corrugated roll base with tooth-shaped corrugated ridges, it is necessary to consider the deformability to thicken the coating or to make the hardness of the corrugated roll base to be HV (Vickers hardness) 680 or more in advance. Therefore, in the corrugated rolls where the surface of the corrugated roll base that is currently used is covered with a hard chrome-plated wear-resistant layer, it is usually by nitriding treatment or carburizing and nitriding treatment or quenching treatment and tempering treatment, etc. In order to make the hardness of corrugated roller base become HV680 or above.

Nitriding treatment or carburizing and nitriding treatment include gas nitriding method, ion nitriding method, ion carburizing nitriding method, low-temperature gas carburizing nitriding method, soft nitriding which is carburizing and nitriding in molten salt (Tufftride) method. Quenching refers to the heat treatment of changing the state of martensit structure by rapid cooling after heating the steel in the austenite phase domain around 850°C. Tempering refers to a heat treatment that provides toughness to steel hardened by quenching, and reheats the steel to a temperature of 550°C to 650°C from the state of the loose iron structure in the field, and cools it after holding it for a certain period of time.

Although Patent Document 1 has proposed a method of coating a diamond film or a WC-Co melt-sprayed film on the surface of the corrugated roller substrate after such hardening, even if the film itself is excellent in abrasion resistance, as long as the adhesion to the corrugated roller substrate is not If it is sufficient, it will still be caused by other factors than wear, for example, Cracks in the film, peeling of the film, etc., can not achieve the desired extent of extended life. Based on these, the wear-resistant layer is required to have excellent wear resistance and hardness, and adhesion to the corrugated roller substrate.

According to the present invention, the laser surfacing method supplies the powder of high-carbon steel or alloy steel that is easily quenched and hardened, preferably while being supplied in an inert gas atmosphere while performing laser irradiation on the surface of the corrugated roller substrate. The powder is melted and allowed to cool, solidify and deposit in sequence, thereby forming a coating layer with high strength and excellent abrasion resistance on the corrugated roller base, and forming precise tooth-shaped corrugated ridges by grinding and grinding . Then, the surface is coated with a hard chromium plating layer with high hardness and excellent wear resistance and lubricity, so as to prolong the service life of the corrugated roller. Moreover, by performing laser surfacing under an inert gas environment, it is possible to prevent oxides from being caught in the surfacing layer, which is preferable.

In order to regenerate the corrugated roller that has been worn or deformed, after grinding and removing the surface of the corrugated roller by more than 1mm, the surface of the corrugated roller that has been removed is formed by laser surfacing method. The coating layer made of high carbon steel or alloy steel of hardness can regenerate the shape of corrugated roll with the size of corrugated roll before grinding. After the shape of the corrugated roller is regenerated, it is important to form a hard chromium plating layer with excellent abrasion resistance on the outermost surface to extend the service life of the corrugated roller after regeneration. In addition, the regeneration of the corrugated roll by laser surfacing and hard chromium plating is repeated, whereby the number of regeneration and reuse of the corrugated roll body by regrind can be greatly extended.

The method of quenching the surface of the corrugated roller base to a high hardness is described in Patent Document 1. At a normal quenching temperature of 930°C, the thermal deformation of the roller will become a problem, while in the quenching at a low temperature, there will be a problem that the quenching depth becomes uneven or the quenching hardness is insufficient. Therefore, carburizing or nitriding is performed in advance, and then quenching and tempering are performed at a relatively low temperature. In addition, in order to reduce the distortion associated with quenching, the quenching system only performs toothed corrugated ridges, and requires a long time of more than 15 hours for quenching and tempering.

Thus, in order to quench the surface of the corrugated roller base to high hardness, complicated treatment is required. On the other hand, in the present invention, since the high-hardness laser surfacing layer composed of high-carbon steel or alloy steel is formed to be 1 mm or more, it is sufficient to increase the hardness of the surface of the corrugated roller base only by this The authors have the same plastic deformation resistance (sag prevention effect), and it is not necessary to harden the surface of the corrugated roller base by nitriding treatment or carburizing nitriding treatment or quenching treatment and tempering treatment as in Patent Document 1. Of course, even in the present invention, the surface of the corrugated roller substrate before laser surfacing can be hardened by nitriding treatment, carburizing nitriding treatment, quenching treatment and tempering treatment. In this case, the plastic deformation resistance (sag prevention effect) becomes higher.

In the present invention, the thickness of the laser surfacing layer composed of high carbon steel or alloy steel is preferably 1 mm to 10 mm. When the thickness is less than 1 mm, the resistance to plastic deformation such as depressions or indentations becomes smaller when used as a corrugated roller. In addition, when the thickness exceeds 10 mm, the resistance to plastic deformation is saturated and hardly increases. As such high-carbon steel or alloy steel, a steel type that can be hardened to HV650 or more by heat treatment is preferable, and specifically, carbon steel such as SKD61 or SCM440, SUS420, etc. containing 0.3% by weight or more of carbon is preferable Of alloy steel.

The hardness of hard chrome plating is above HV1000. Therefore, according to the present invention, when the surface of the corrugated roll on which the build-up layer of high carbon steel or alloy steel is formed is further coated with a hard chromium plating layer having a thickness of 10 μm to 200 μm, abrasion resistance and lubricity can be improved. When the thickness of the hard chrome plating layer is less than 10 μm, there is no expectation that the service life will be prolonged due to the improved wear resistance. On the other hand, when the thickness of the hard chrome plating layer exceeds 200 μm, the shape of the corrugated roll will be very complex It is very difficult to plate uniformly, so it is possible to improve the wear resistance and lubricity of the ridge part, but because the trough part cannot obtain the necessary film thickness, it becomes impossible to improve the wear resistance and lubrication of the trough part The coating with uneven performance.

In addition, the present invention is a corrugated roll hardened by nitriding treatment or carburizing nitriding treatment or quenching treatment and tempering treatment in order to achieve a longer service life of corrugated rolls with toothed corrugated ridges On the surface of the substrate, a highly wear-resistant coating layer with high strength and excellent wear resistance is formed. Specifically, as for the high wear-resistant coating layer excellent in abrasion resistance and hardness and adhesion to the corrugated roller substrate, high-carbon steel or alloy steel that is easily quenched and hardened is used as the matrix material, and wear-resistant The high-damage and high-hardness carbide ceramics as a dispersant laser surfacing layer are extremely effective for extending the service life of corrugated rollers.

That is, by supplying the mixed powder of the above matrix material and the dispersant of the carbide ceramic to the surface of the corrugated roller substrate while irradiating the laser, the carbide ceramic is dispersed on the substrate that has been melted on the surface of the corrugated roller substrate In order to form a high-strength and wear-resistant coating layer with high strength and excellent abrasion resistance, the laser surfacing method of cooling and solidifying and depositing it in sequence can form a corrugated roller with a longer service life.

The diameter of the laser beam is as small as a few mm, and the supplied "high carbon steel or alloy steel powder" or "high carbon steel or alloy powder mixed with carbide" is melted The size of the pool is also the same. By controlling the supply of the above powder or mixed powder, the energy of the laser beam and the scanning speed of the laser beam, the amount of the corrugated roller base component mixed into the molten pool from the interface where the melting pool and the corrugated roller base contact 10% by weight or less, by which the wear resistance of the surfacing layer is not compromised, and high strength with excellent adhesion can be obtained High wear-resistant coating. By making the mixing amount of the corrugated roller base component to the melting pool 2% to 6% by weight, the wear resistance of the surfacing layer is not impaired, and the adhesion can be further improved.

In order to improve the quenching effect of the laser surfacing layer or to reduce the amount of the components of the corrugated roller base mixed into the molten pool from the interface between the molten pool and the corrugated roller base, it is preferable to reduce the molten pool. The diameter of the molten pool is as small as a few mm, so the heat capacity is small, and the temperature of the molten pool is above the melting point of high-carbon steel or alloy steel. By quenching and solidifying from high temperature, the hardness is the same as the quenching hardness. For example, even in the case of SCM440 alloy steels that do not contain carbides, hardness of HV650 or higher can still be obtained. Furthermore, when carbide ceramics are used as a dispersant in the matrix of high-carbon steel or alloy steel, the hardness of HV1100 or more can be easily obtained by changing the amount of the dispersant.

The film thickness of the laser surfacing layer can be controlled by controlling the supply of "high carbon steel or alloy steel powder" or "high carbon steel or alloy steel and carbide powder" and the energy and energy of the laser beam Adjust the scanning speed of the laser beam. For example, by slowing down the scanning speed of the laser beam, the thickness of the laser surfacing layer can be increased. On the other hand, when the thickness of the laser surfacing layer is thickened in this way, the energy supplied per unit area will become larger, and the depth of the molten pool will become deeper to increase the heat capacity, so the cooling rate will decrease, so It becomes difficult to obtain high hardness, and thermal distortion becomes large. Therefore, when the thickness of the laser surfacing layer is to be increased, it is preferable to obtain a surfacing layer of a desired thickness by stacking a plurality of thinner surfacing layers. In particular, in the case where the damaged part of the used corrugated roll is removed by grinding, and the corrugated roll is regenerated to a thickness and shape of the same degree as the removal amount, the preferred method is to use a thin laser stack A thinner laser surfacing layer is repeatedly stacked on top of the welding layer.

The high-strength and high-abrasion-resistant coating layer of the present invention is formed on the surface of the corrugated roll substrate after laser surfacing, thereby regenerating the corrugated roll size before grinding Corrugated roller shape. In addition, by repeating the laser surfacing method, the number of regeneration and reuse by re-grinding of the corrugated roller substrate can also be greatly extended.

The thickness of the highly wear-resistant coating layer is preferably 0.1 mm to 3 mm. When the thickness is less than 0.1 mm, although a certain degree of wear resistance can be obtained, it cannot be expected that the service life of the corrugated roll that is compatible with the processing cost will be extended. In addition, since the wear resistance is improved according to the thickness of the high wear-resistant coating layer, the service life of the corrugated roller can be extended by setting the thickness of the high wear-resistant coating layer to 0.1 mm or more. On the other hand, when its thickness exceeds 3mm, there will be the following disadvantages: it will increase the probability of defects in the build-up welding layer (high wear-resistant coating), or it is easy to appear based on the corrugated ridges The main reason for the reduction of other service life due to defects such as the decrease in toughness due to the increase in hardness. Although it is also possible to increase the strength of the high wear-resistant coating by increasing the thickness of the thin laser surfacing layer repeatedly on the thin surfacing layer, or to increase the strength of the tooth-shaped corrugated wave A corrugated ridge with a thicker depth and a high wear resistance coating layer is formed on the surface of the corrugated roller substrate, and the excess thickness is cut to form a corrugated ridge of a predetermined size, but the thickness of the high wear resistance coating layer is preferably set to Below 3mm.

The high-abrasion-resistant coating layer is composed of carbide ceramics as a dispersed phase component and high-carbon steel or alloy steel as a matrix component. The carbide ceramic as a dispersed phase component is one or more selected from tungsten carbide, molybdenum carbide, titanium carbide, niobium carbide, and zirconium carbide that have high hardness and excellent wear resistance and heat resistance. The content of the carbide ceramic in the high wear-resistant coating layer is preferably 5% to 30% by weight. When the content of carbide is less than 5% by weight, a significant increase in hardness cannot be achieved, and the improvement in wear resistance is not sufficient. On the other hand, due to carbon When the content of the compound ceramic exceeds 30% by weight, the toughness of the laser surfacing layer will be reduced, which is not good. Furthermore, the carbide ceramics do not necessarily need to be uniformly dispersed in the high-abrasion-resistant coating layer, and there may be more lateral portions than the inner portion outside the high-abrasion-resistant coating layer.

As shown in the second figure described later, as the content of the known carbide ceramics becomes larger, the harder it becomes, so as long as the thinner laser surfacing layer is repeatedly stacked on the thinner laser In the laser surfacing layer formed on the surfacing layer, the content of carbide ceramics, for example, at 5 wt%, 10 wt%, 20 wt%, 30 wt%, slowly increases from the inside toward the outside, It can be made harder the outer side, and the inner side can be formed to have a hardness close to that of the steel material of the corrugated roller base. Therefore, it has the following advantages: even if the corrugated roll is bitten by a foreign body, etc., and thus exerts a force to dent the corrugated roll, the corrugated roll is not easily broken, and cracks are not easily generated in the highly wear-resistant coating, and the high resistance The wear coating is not easy to peel.

The method of repeatedly stacking a thinner laser surfacing layer on a thinner laser surfacing layer is to form a thicker highly wear-resistant coating layer on the toothed corrugated ridge of the corrugated roller The following is particularly effective. When a thicker high wear-resistant coating is to be formed on the toothed corrugated ridge, it is composed of "a powder composition of high carbon steel or alloy steel" or "a mixture of high carbon steel or alloy steel and carbide" The molten pool formed by the "powder component" becomes larger, so that the molten metal flows out of the corrugated ridge before the molten metal in the molten pool solidifies. However, as long as the thinner laser surfacing layer is repeatedly stacked on the thinner laser surfacing layer, such a bad situation will not occur, so the corrugated wave of the corrugated roller can be The ridges form a highly wear-resistant coating of the desired thickness.

As the dispersed phase component, the carbide ceramic dispersed in the high wear-resistant coating layer has a smaller particle size and is uniformly dispersed, the more the hardness and wear resistance of the high wear-resistant coating layer can be improved Sex. Therefore, it is preferable to mix a carbide ceramic of about several μm with a matrix of high carbon steel or alloy steel and then granulate it to a particle size (20 μm to 150 μm) that can be easily laser-surfacing.

The matrix component of the highly wear-resistant coating layer is preferably hardened into a steel grade of more than 650 by heat treatment. Specifically, it is preferably carbon steel such as SKD61 containing 0.3% by weight or more of carbon, or alloy steel such as SCM440 or SUS420.

As the base of the corrugated roller, since the conventional use of ordinary steel (C content of 0.30% to 0.38% by weight of structural carbon steel S43C) or alloy steel (C content of 0.38% to 0.43% by weight of chromium molybdenum (chrome molybdenum) steel SCM440) etc.

The "powder of high carbon steel or alloy steel" or "mixed powder of high carbon steel or alloy steel matrix and carbide ceramic" used in the laser surfacing method of the present invention is preferably an average of 20 μm to 150 μm Particle size. When supplying powder to the irradiation spot of the laser beam, in order to prevent the oxidation of the powder or the molten pool, it is preferably supplied together with argon gas, but in the case of a powder containing a lot of fine particles with a particle diameter of less than 20 μm, The micro-particle system will not easily fall into the molten pool, but will fly to the periphery of the laser surfacing device. Therefore, it is not only difficult to control the thickness of the laser surfacing layer, but also because the fine particles will stay in the air for a long time, it is also unfavorable from the viewpoint of working environment. On the other hand, when the particle size exceeds 150 μm, the surface roughness of the laser build-up layer becomes larger, not only the surface grinding process after the build-up welding takes time, but also the carbide ceramic is easily dispersed unevenly in the matrix. Therefore, the average particle size of "powder of high carbon steel or alloy steel" or "mixed powder of matrix of high carbon steel or alloy steel and carbide ceramic" is preferably 20 μm to 150 μm.

In addition, the shape of the tooth-shaped corrugated ridge of the corrugated roll is not particularly limited, for example, as long as a known shape exemplified in Patent Documents 1 to 3 is appropriately adopted. The shape of each toothed corrugated ridge is generally formed in a circular arc on a section perpendicular to the axial direction of the corrugated roll. In this case, the shape of the corrugated trough part meshing with the toothed corrugated ridge also becomes an arc shape, and the arc of the corrugated ridge part and the corrugated trough part is generally smoothed by a straight part or a curved part of an appropriate length地连接。 Ground connection. (For example, Japanese Patent Laid-Open No. 2007-98902).

[Examples]

[Example 1]

On the surface of the substrate made of alloy steel SCM440 with a diameter of 100 mm and a length of 150 mm, while supplying powder of carbon steel SKD61 containing 0.3% by weight or more of carbon, powder of alloy steel SCM440 or stainless steel SUS420 in an argon atmosphere The powder is irradiated with semiconductor laser to form a laser surfacing layer with a thickness of 5 mm. The particle size of each powder is adjusted to 40μm to 90mμm, and while the powder is supplied at a supply speed of 6g/min or 8g/min, the scanning speed of the laser beam is set to 300mm/min or 600mm/min, and the irradiation wavelength A semiconductor laser with an output of 950nm to 1070nm and an output of 1300W. The test conditions are shown in Table 1.

Repeat the above test conditions A four times and test conditions B eight times to form a laser surfacing layer with a thickness of about 5 mm, and after the surface is processed into a flat surface by grinding, it is determined that the test force is maintained at 200 g Vickers hardness at 15 seconds. Table 2 shows the measurement results.

In the test condition B where the powder supply speed is smaller than the test condition A and the laser beam scanning speed is faster than the test condition A, since the molten pool will become smaller and the molten metal will be cooled rapidly, it is clear that it will be better than the test The condition A also achieves higher hardness. Therefore, when the laser surfacing layer is laminated into multiple layers, as long as the powder supply speed is reduced from the lower layer to the upper layer, and the laser beam scanning speed is controlled to be controlled, the hardness of the upper layer can be increased more than the lower layer , Can be described as good.

In the application of corrugated rollers, after forming the laser surfacing layer, by grinding and grinding, after forming the tooth-shaped corrugated ridge with the desired dimensional accuracy, the surface is coated with a hardness of 0.01mm to 0.2mm Chrome plating.

[Example 2]

On the surface of the base material composed of alloy steel SCM440 with a diameter of 100 mm and a length of 150 mm with a hardness of HV560 formed by quenching and tempering, while supplying powder of carbon steel SKD61 containing 0.3% by weight or more of carbon in an argon atmosphere, The powder of alloy steel SCM440 or the powder of stainless steel SUS420 is irradiated with semiconductor laser to form a laser surfacing layer with a thickness of 5 mm. The particle size of each powder is adjusted to 40μm to 90mμm, and while the powder is supplied at a supply speed of 6g/min or 8g/min, the scanning speed of the laser beam is set to 300mm/min or 600mm/min, and the irradiation wavelength A semiconductor laser with an output of 950nm to 1070nm and an output of 1300W. The test conditions are shown in Table 3.

Repeat the above test conditions A four times and test conditions B eight times to form a laser surfacing layer with a thickness of only about 5 mm, and after the surface is processed into a flat surface by grinding, the test force is maintained at 200 g. Vickers hardness at 15 seconds. Table 4 shows the measurement results.

In the test condition B where the powder supply speed is smaller than the test condition A and the laser beam scanning speed is faster than the test condition A, since the molten pool will become smaller and the molten metal will be cooled rapidly, it is clear that it will be better than the test The condition A will achieve a higher hardness. Therefore, when the laser surfacing layer is laminated into multiple layers, as long as the powder supply speed is reduced from the lower layer to the upper layer, and the laser beam scanning speed is controlled to be controlled, the hardness of the upper layer can be increased more than the lower layer , Can be described as in good condition. In addition, when comparing Table 2 and Table 4, it can be understood that the value of Vickers hardness of Table 4 on the surface of the laser surfacing layer is slightly higher than that of Table 2, but there is no significant difference, and the laser surfacing layer There is almost no change in its own hardness. Hardening the corrugated roller substrate in advance is advantageous from the viewpoint of resistance to plastic deformation such as when biting foreign objects, but when only friction and wear are considered, it is not necessarily necessary to harden the corrugated roller substrate in advance.

[Example 3]

On the surface of alloy steel SCM440 (disc-shaped alloy steel with a diameter of 60 mm and a thickness of 10 mm), a powder of titanium carbide mixed with an average particle diameter of 45 μm to 125 μm and an average particle diameter of 45 μm were supplied at a feed rate of 8 g/min A mixed powder of SUS420 powder up to 125 μm is irradiated with a laser beam with a scanning speed of 600 mm/min, a wavelength of 950 nm to 1070 nm, and an output of 1300 W to form a semiconductor laser in which titanium carbide is dispersed in SUS420 as a matrix The thickness of the laser surfacing layer is 2mm. The titanium carbide powder in the mixed powder is set to 10% by weight. In addition, instead of the mixed powder of the titanium carbide powder and the SUS420 powder, a disc-shaped test piece having a laser surfacing layer with a thickness of 2 mm composed only of the SUS420 powder was also produced under the same conditions.

About a disc-shaped test piece with a laser surfacing layer of the above titanium carbide powder of 10% by weight and a SUS420 powder of 90% by weight (Example 1 of the present invention), and a laser stack with only SUS420 powder The disc-shaped test piece of the solder layer (Example 2 of the present invention) uses the H-10 grinding ring as the grinding ring belonging to the corresponding material, and was subjected to the wear resistance evaluation by the Taber wear test . The load of the Taber wear test is set to 9.8N, and the weight loss is measured per 1000 rotations, and the volume reduced by wear (cm ³ /1000 rotations) is calculated according to the coating density of the laser surfacing layer . Table 5 shows the results of the Taber Abrasion Test. The Vickers hardness of the laser surfacing layer is shown in Table 5. This Vickers hardness system shows the value when the test force was maintained at 200 g for 15 seconds. As shown in Table 5, it can be understood that Example 1 of the present invention having a laser surfacing layer composed of a mixed powder of titanium carbide powder and SUS420 powder is associated with a laser surfacing welding consisting only of SUS420 powder Compared with the inventive example 2 of the layer, the inventive example 1 has less volume reduced due to wear, and the Vickers hardness is also improved.

[Example 4]

On the surface of the alloy steel SCM440 (disk-shaped alloy steel with a diameter of 60 mm and a thickness of 10 mm) formed into a hardness of HV560 by quenching and tempering, the average particle diameter of 45 μm is mixed at a supply rate of 8 g/min to The mixed powder of 125μm tungsten carbide (WC) powder and powder of alloy steel (SCM440) with an average particle size of 45μm to 125μm, while irradiated with a laser beam, the scanning speed is 600mm/min, the wavelength is 950nm to 1070nm, the output is A 1300W semiconductor laser is used to form a laser surfacing layer with a thickness of 2mm formed by dispersing tungsten carbide in SCM440 as a matrix. In addition, the content of tungsten carbide in the mixed powder varies from 0% to 30% by weight.

Figure 1 is a photograph showing the cross-sectional structure of the sample with the laser surfacing layer formed as described above. In the figure, the upper left (Example 5 of the present invention) is a photograph showing the cross-sectional structure of a laser surfacing layer containing only a matrix that does not contain tungsten carbide (SCM440), and the upper right shows the content of tungsten carbide in the mixed powder is 5% by weight The remaining part is a photo of the cross-sectional structure of the laser surfacing layer of the matrix (SCM440). The lower right part shows that the content of tungsten carbide in the mixed powder is 20% by weight and the rest is the laser surfacing layer of the matrix (SCM440). The photo of the cross-sectional organization.

Figure 2 shows the relationship between the tungsten carbide content (wt%) and the coating film hardness (Vickers hardness HV) in the mixed powder of the sample formed with the laser surfacing layer as described above. The Vickers hardness It shows the value when the test force was maintained at 200g for 15 seconds. The hardness of the laser surfacing layer without the tungsten carbide and only the matrix shows HV650. As the content of tungsten carbide in the mixed powder increases, the hardness of the surfacing layer will increase, and it has reached HV1112 when the content of tungsten carbide is 30% by weight.

In addition, a disc-shaped test piece (Example 3 of the present invention) having a laser surfacing layer of the above-mentioned tungsten carbide powder of 5% by weight and 95% by weight of the SCM440 powder has 20% by weight of the tungsten carbide powder SCM440 powder is a disc-shaped test piece of a laser surfacing layer of 80% by weight (invention example 4), and a disc-shaped test piece of a laser surfacing layer with only SCM440 powder (invention example) 5), the H-10 grinding ring is used as the grinding ring belonging to the corresponding material, and the wear resistance evaluation according to the Taba wear test is carried out. The load of the Taber wear test is set to 9.8N, and the weight loss is measured per 1000 rotations, and the volume reduced by wear (cm ³ /1000 rotations) is calculated according to the coating density of the laser surfacing layer . Table 6 shows the results of the Taber Abrasion Test. As shown in Table 6, Examples 3 and 4 of the present invention having a laser surfacing layer composed of a mixed powder of tungsten carbide powder and SCM440 powder, and those having a laser surfacing layer composed only of SCM440 powder Compared with Example 5 of the present invention, the reduced volume of Examples 3 and 4 of the present invention due to wear is reduced.

[Example 5]

Titanium carbide and molybdenum carbide were selected for the surface of alloy steel SCM440 (disk-shaped alloy steel with a diameter of 60 mm and a thickness of 10 mm) formed by hardness HV560 by quenching and tempering. , Niobium carbide, zirconium carbide, as the carbide ceramics belonging to the dispersed phase component in the laser surfacing layer, and at a feed rate of 8 g/min, the powder of each carbide ceramic with an average particle size of 45 μm to 125 μm is averaged The powder of SUS420 with a particle size of 45 μm to 125 μm contains 10% by weight of the resulting mixed powder, while the laser surfacing layer was formed under the same conditions as in Example 4, and the hardness of HV560 was formed by quenching and tempering. The surface of alloy steel SCM440 (disc-shaped alloy steel with a diameter of 60 mm and a thickness of 10 mm) was supplied at a feed rate of 8 g/min to SUS420 powder having an average particle size of 45 μm to 125 μm, and the same side as in Example 4 Conditions to produce a laser surfacing layer, and no laser surfacing layer is formed on the surface of alloy steel SCM440 (disk-shaped alloy steel with a diameter of 60 mm and a thickness of 10 mm) formed by hardness HV560 by quenching and tempering To determine the Vickers hardness, the wear resistance was evaluated by the Taber Abrasion Test (volume reduced due to wear). The Vickers hardness measurement method and the Taber abrasion test method are the same as in Example 4.

As shown in Table 7, it can be understood that Examples 6 to 10 of the present invention are higher in hardness than Comparative Example 1 which does not have a laser surfacing layer, which reduces the volume reduced by wear, and has Very excellent wear resistance. Furthermore, it can be understood that Examples 6 to 9 of the present invention having a laser surfacing layer composed of a mixed powder of carbide ceramic powder and SUS420 powder are related to the present invention having a laser surfacing layer composed of only SUS420 powder Compared with Example 10, Examples 6 to 9 of the present invention have less body reduction due to wear, and the Vickers hardness is also significantly improved.

[Industry availability]

The high-abrasion-resistant coating layer for corrugated roller of the present invention is a coating layer with excellent adhesion to the corrugated roller substrate, high strength and excellent abrasion resistance, which has excellent plastic deformation resistance and can also be used to easily cause depressions Roller or mold use. The laser surfacing layer for corrugated rollers of the present invention has excellent adhesion to the corrugated roller substrate, high strength and excellent plastic deformation resistance. In addition, the surface is coated with hard chromium plating to provide excellent wear resistance and a small friction coefficient. It can also be used in rollers or large wear-resistant parts that are prone to dents.

1‧‧‧SCM440 equivalent material

2‧‧‧WC particles

Claims (11)

A corrugated roller is formed on the outer circumference of the roller with corrugated corrugated ridges that shape the core paper of corrugated cardboard into waves, wherein: all of the corrugated roll ridge surface or the uneven surface of the corrugated roller base body has The surfacing layer of high carbon steel or alloy steel with a thickness of 1mm to 10mm formed by laser surfacing. A corrugated roller is formed on the outer circumference of the roller with corrugated corrugated ridges that shape the core paper of corrugated cardboard into waves, wherein: all of the corrugated roll ridge surface or the uneven surface of the corrugated roller base body has A high wear-resistant coating made of high-carbon steel or alloy steel and carbide formed by laser surfacing with a thickness of 0.1mm to 3mm. The corrugated roller as described in item 1 or 2 of the patent application, wherein the corrugated roller base system is hardened in advance by nitriding treatment or carburizing nitriding treatment or quenching treatment and tempering treatment. The corrugated roller as described in item 2 of the patent application scope, wherein the high wear-resistant coating layer is composed of one of tungsten carbide, molybdenum carbide, titanium carbide, niobium carbide and zirconium carbide containing 5 to 30% by weight Or more than two kinds, the rest is made of high carbon steel or alloy steel containing more than 0.3% by weight of carbon. The corrugated roller as described in item 1 or 2 of the patent application, wherein the surface is further coated with a hard chrome plating layer with a thickness of 10 μm to 200 μm. The corrugated roller as described in item 1 or 2 of the patent application scope, wherein the laser surfacing method is implemented under an inert gas environment. A manufacturing method of corrugated roller, in which: The outer surface of the roll is formed on the surface of the corrugated roll base with corrugated corrugated ridges that form the core paper of corrugated cardboard. While supplying powder of high-carbon steel or alloy steel with an average particle size of 20 μm to 150 μm, light is irradiated. To form a molten pool composed of the above-mentioned powder components on the surface of the corrugated roller base, and supply the powder and laser irradiation along the tooth shape of the corrugated roller base, thereby sequentially solidifying the above-mentioned molten pool to form a layer or Multi-layer surfacing layer. A method for manufacturing corrugated rolls, wherein: a corrugated roll base surface formed by corrugated corrugated ridges with corrugated cardboard core paper formed on the outer periphery of the roll, while supplying high-carbon steel with an average particle size of 20 μm to 150 μm Or a mixed powder of alloy steel and carbide, while irradiating laser to form a molten pool composed of the above-mentioned mixed powder components on the surface of the corrugated roller base, and supplying the mixed powder and the laser along the tooth shape of the corrugated roller base The irradiation, thereby sequentially solidifying the molten pool to form one or more layers of laser surfacing. The manufacturing method of corrugated roller as described in item 7 or 8 of the patent application scope, wherein, before irradiating the laser, the corrugated roller substrate is previously subjected to nitriding treatment or carburizing nitriding treatment or quenching treatment and return Fire treatment to give hardening treatment. The method for manufacturing a corrugated roll as described in item 7 or 8 of the patent application scope, wherein the surface is treated with a hard chrome plating layer with a thickness of 10 μm to 200 μm. The method for manufacturing corrugated rollers as described in item 7 or 8 of the patent application scope, wherein the laser irradiation is carried out under an inert gas environment.

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