WO2019181085A1 - Cylindre cannelé et son procédé de fabrication - Google Patents

Cylindre cannelé et son procédé de fabrication Download PDF

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WO2019181085A1
WO2019181085A1 PCT/JP2018/044535 JP2018044535W WO2019181085A1 WO 2019181085 A1 WO2019181085 A1 WO 2019181085A1 JP 2018044535 W JP2018044535 W JP 2018044535W WO 2019181085 A1 WO2019181085 A1 WO 2019181085A1
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corrugated
corrugated roll
laser
roll
layer
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PCT/JP2018/044535
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English (en)
Japanese (ja)
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幸平 石田
保志 北村
利幸 中嶋
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株式会社野村鍍金
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Priority claimed from JP2018050793A external-priority patent/JP2021088726A/ja
Priority claimed from JP2018079464A external-priority patent/JP2021088728A/ja
Application filed by 株式会社野村鍍金 filed Critical 株式会社野村鍍金
Publication of WO2019181085A1 publication Critical patent/WO2019181085A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy

Definitions

  • the present invention relates to a corrugated roll having a tooth-shaped corrugation for corrugating core paper for corrugated cardboard and a method for producing the corrugated roll.
  • the corrugated corrugated sheet is formed into a corrugated sheet by placing two corrugated rolls having tooth-shaped stepped mountains in mesh and passing the core paper through the mesh.
  • the tooth-shaped steps of the two corrugating rolls that mesh with each other are formed so as to extend in the transverse direction with respect to the direction in which the core paper passes. Since the core paper is drawn into the meshing portions of the upper and lower corrugated rolls while sliding the corrugated portion, the corrugated portion of the corrugated roll is likely to be worn due to frictional wear. In addition, when the core paper is pulled in, foreign matter may be bitten to cause a dent-like deformation in the stepped portion. If the wear amount of the stepped portion becomes large or a dent is formed in the stepped portion, the corrugated molding becomes defective, and the life of the stepped roll is reached.
  • the hardness of the step roll base in the stepped portion is set to Vickers hardness of 680 or more as a countermeasure against the stepped portion dent.
  • the damaged portion is removed by regrinding to regenerate the tooth-shaped corrugated shape.
  • the roll diameter is reduced by regrinding, it is necessary to adjust the corrugated shape to optimally maintain the meshing of the upper and lower corrugated rolls.
  • the diameter becomes smaller as the number of recycles is repeated. Therefore, the maximum number of recycles by regrinding is about 3 times.
  • Patent Document 1 if the relationship between the hardness (Shore hardness Hs) of the stepped portion of the actual machine roll that has reached the end of life and the number of dents is examined, and the hardness Hs of the corrugated roll substrate is set to Hs> 80, It shows that the dent (that is, the indentation) can be made almost zero.
  • a method is shown in which the hardness Hs of the corrugated roll base is set to Hs> 80 by performing a combined heat treatment method using a combination of carbonitriding and heating and quenching.
  • Patent Document 2 for the purpose of improving wear resistance, a carbide cermet such as WC-Co is sprayed on the surface of a steel corrugated roll base with a high-speed combustion gas flame, and Ni-P or the like is applied on the surface of the sprayed film.
  • a method of manufacturing a corrugated roll that performs electroless plating is proposed.
  • Patent Document 3 for the purpose of reclaiming the corrugated roll, a high hardness build-up weld layer having a Shore hardness Hs of 80 or more that is thicker than the corrugated depth is formed by fusing to the corrugated roll substrate, and the surplus thickness is shaved. It is proposed to process to a predetermined dimension.
  • Patent Document 1 for the purpose of improving wear resistance, a method of coating hard chrome plating on the surface of a corrugated roll substrate having high hardness has been proposed.
  • nitriding treatment or carbonitriding is performed. It is necessary to increase the hardness of the corrugated roll substrate surface by treatment or quenching and tempering, and the corrugated roll manufacturing process is complicated.
  • the corrugated roll reaches the end of its life, if the worn part is removed by re-grinding, the surface of the corrugated roll substrate needs to be hardened again, and the number of regenerations by re-grinding is limited to about 3 times. There is an inconvenience.
  • the method of coating the surface of the corrugated roll substrate with a diamond film or a WC-Co sprayed film adheres to the corrugated roll substrate even though the film itself has excellent wear resistance. If the properties are insufficient, the expected life extension cannot be achieved due to factors other than wear, such as crack formation in the film and film peeling.
  • the corrugated mountain is likely to be chipped due to the inclusion of oxides or welding defects that are likely to be mixed during overlay welding, compared to a new corrugated roll. A much shorter lifespan.
  • the present invention has been made in view of the above points, and as a coating layer excellent not only in wear resistance and hardness but also in adhesion to the surface of a corrugated roll substrate, a laser build-up weld layer (corrugated layer) is provided.
  • a metal lamination method in which the metal powder is melted on the surface of the corrugated roll substrate by being irradiated with a laser while supplying the metal powder to the roll substrate surface, and then cooled, solidified and deposited). It aims at preventing the shortening of the lifetime by factors other than abrasion as well as wear, and achieving further extension of the life of the corrugated roll.
  • the present invention in order to increase the hardness of the surface of the corrugated roll base serving as the base of the hard chromium plating, high carbon steel or alloy steel that is easily hardened by quenching is accurately formed by laser overlay welding. Accordingly, another object of the present invention is to make it possible to easily regenerate corrugated rolls that have been worn and damaged by use.
  • the corrugated roll base means a corrugated roll itself having a tooth-shaped corrugated shape in which a corrugated core paper is formed in a corrugated shape on the outer periphery of the roll, and a wear-resistant layer for improving wear resistance.
  • a corrugated roll in which a corrugated corrugated corrugated corrugated core paper is formed on the outer periphery of the roll, the thickness of the corrugated roll crest surface or uneven surface of the corrugated roll base by laser overlay welding is used.
  • a corrugated roll having a build-up weld layer of 1-10 mm high carbon steel or alloy steel is a first invention.
  • a corrugated roll in which a corrugated core is formed on the outer periphery of the roll in a corrugated shape, the surface of the corrugated roll base of the corrugated roll base or the entire surface of the corrugated surface is high by laser overlay welding.
  • a corrugated roll characterized by having a high wear-resistant coating layer made of carbon steel or alloy steel and carbide and having a thickness of 0.1 to 3 mm is a second invention.
  • a corrugated roll characterized in that the corrugated roll substrate is previously cured by nitriding treatment, carbonitriding treatment, quenching treatment and tempering treatment is a third invention.
  • the high wear-resistant coating layer contains 5 to 30% by weight of one or more of tungsten carbide, molybdenum carbide, titanium carbide, niobium carbide and zirconium carbide.
  • a corrugated roll characterized in that the balance is made of high carbon steel or alloy steel containing 0.3 wt% or more of carbon is a fourth invention.
  • a corrugated roll characterized in that the surface is further coated with a hard chromium plating layer having a thickness of 10 to 200 ⁇ m is a fifth invention.
  • a corrugated roll characterized in that the laser build-up welding method is carried out in an inert gas atmosphere is a sixth invention.
  • a seventh aspect of the present invention is a method for producing a corrugated roll characterized in that a single-layer or multi-layer build-up weld layer is formed.
  • a high-carbon steel or alloy steel and carbide mixed powder with an average particle size of 20 to 150 ⁇ m is formed on the surface of a corrugated roll base on which a corrugated core paper is formed in a corrugated shape on the outer periphery of the roll.
  • the eighth aspect of the present invention is a method for producing a corrugated roll characterized in that the molten pool is solidified to form a single-layer or multi-layer laser build-up weld layer.
  • a corrugated roll characterized by subjecting the corrugated roll base to a hardening process by nitriding or carbonitriding or quenching and tempering in advance before irradiating the laser.
  • the manufacturing method is the ninth invention.
  • a tenth aspect of the invention relates to a method for producing a corrugated roll characterized in that the surface is further coated with a hard chromium plating layer having a thickness of 10 to 200 ⁇ m. .
  • the method for producing corrugated rolls characterized in that laser irradiation is carried out in an inert gas atmosphere is the eleventh invention.
  • the hardness of the build-up weld layer can be increased by the quenching effect by rapid heating and cooling during laser build-up welding, so even if a foreign object is bitten when the core paper is pulled in It is hard to produce a dent in a peak part, and it can attain the lifetime improvement of a corrugated roll.
  • the entire surface of the corrugated roll crest or uneven surface of the corrugated roll base is made of high carbon steel or alloy steel and carbide with a thickness of 0.1 to 3 mm by laser overlay welding. Since it has a layer, not only abrasion resistance and hardness but also a coating layer with high adhesion to the corrugated roll substrate can be formed, and the life of the corrugated roll can be extended.
  • the corrugated roll base is hardened in advance by nitriding treatment or carburizing treatment or quenching treatment and tempering treatment, so that it is more resistant to plastic deformation than the first or second invention. Therefore, the life of the corrugated roll can be further extended.
  • the high wear resistant coating layer contains 5 to 30% by weight of one or more of tungsten carbide, molybdenum carbide, titanium carbide, niobium carbide and zirconium carbide, with the balance being 0. .
  • High carbon steel or alloy steel containing 3% by weight or more of carbon. Due to the rapid heating and cooling effect during laser overlay welding, the high carbon steel that is the matrix of the high wear resistant coating layer or The hardness of the alloy steel itself can be increased, and the high-carbon steel or alloy steel of the matrix of the high wear-resistant coating layer is fused with the steel material of the corrugated roll base, so that the high wear-resistant coating layer adheres to the corrugated roll base. Furthermore, since the hardness and wear resistance can be further improved by the above-mentioned carbide ceramics, the life of the corrugated roll can be further extended.
  • the core paper since the surface of the build-up weld layer is further coated with a hard chrome plating layer having a thickness of 10 to 200 ⁇ m that is excellent in wear resistance and lubricity, the core paper has a corrugated portion. It is possible to reduce wear when being pulled while sliding, and to further extend the life of the corrugated roll.
  • the laser build-up welding method is performed in an inert gas atmosphere, so that a build-up weld layer with less oxide entrainment can be obtained, and the length of the corrugated roll can be increased. Life can be extended.
  • the powder particle size is 20 to 150 ⁇ m
  • the powder supply can be smoothly carried out without clogging, so that the thickness control of the build-up weld layer is easy, and the build-up welding is also possible.
  • the surface roughness of the layer can also be smoothed.
  • by supplying the powder and irradiating the laser along the tooth pattern of the corrugated roll base it is possible to obtain a build-up weld layer having a high hardness by quench hardening by rapidly solidifying the molten pool.
  • the steel material of the corrugated roll base also has the effect that the hardness can be increased by the influence of the heat treatment by rapid heating and cooling by passing through the laser irradiation spot.
  • the mixed powder since the mixed powder has a particle size of 20 to 150 ⁇ m, the powder supply can be performed smoothly without clogging, so that the thickness control of the build-up weld layer is easy, and the build-up is also possible.
  • the surface roughness of the weld layer can also be made smooth.
  • the steel material of the corrugated roll base also has an effect that the hardness can be increased by the influence of the heat treatment by rapid heating and cooling due to the passage of the laser irradiation spot.
  • FIG. 5 It is a figure which shows the relationship between tungsten carbide content in the mixed powder of alloy steel and tungsten carbide, and film hardness.
  • corrugated rolls having tooth-shaped stepped ridges for forming corrugated corrugated shapes reaches the end of their life.
  • the corrugated portion of the upper and lower corrugated rolls is worn and the corrugated portion is formed by biting foreign matter when the core paper is pulled.
  • There are two types of ridge-shaped deformation of the ridges and the portion forming the tooth-shaped step ridges of the corrugated rolls requires a material that is excellent in both wear resistance and deformation resistance.
  • the wear-resistant layer is coated on the surface of the corrugated roll base having a tooth-shaped stepped mountain, in consideration of the deformability, the corrugated roll base is thickly coated or the hardness of the corrugated roll base is 680 (Vickers hardness) or more.
  • the hardness of the corrugated roll base is usually obtained by nitriding or carbonitriding or quenching and tempering. Is set to 680 or more in HV.
  • nitriding treatment or carbonitriding treatment there are a gas nitriding method, an ion nitriding method, an ion carbonitriding method, a low temperature gas carbonitriding method, a tuftride method for carbonitriding in a molten salt, and the like.
  • Quenching is a heat treatment in which the steel is heated in the austenite phase region around 850 ° C. and then rapidly cooled to change the state of the martensite structure
  • tempering is a heat treatment that imparts toughness to the steel hardened by quenching. This is a heat treatment in which the steel is reheated to 550 to 650 ° C. from the state of the site structure, kept for a certain time, and then cooled.
  • high-carbon steel or alloy steel powder that is easy to quench and harden is melted on the surface of the corrugated roll substrate by irradiating with laser while preferably supplying the powder in an inert gas atmosphere
  • a coating layer with high strength and excellent wear resistance is formed on a corrugated roll base by laser build-up welding, which is cooled, solidified, and deposited in order, and is ground and polished to form a precise tooth profile. Form a mountain.
  • the surface of the corrugated roll is coated with a hard chromium plating layer having high hardness and excellent wear resistance and lubricity, thereby extending the life of the corrugated roll.
  • the corrugated roll surface is ground and removed by 1 mm or more, and then the portion corresponding to the corrugated roll surface that has been removed is laser-welded and high-hardness carbon steel.
  • a coating layer made of alloy steel it is possible to regenerate the corrugated roll shape having the corrugated roll dimensions before grinding. After the corrugated roll shape is regenerated, forming a hard chromium plating layer having excellent wear resistance on the outermost surface is important for extending the life of the regenerated corrugated roll. Further, by repeating the laser beam welding and the regeneration of the corrugated roll by the hard chrome plating layer, it becomes possible to greatly increase the number of times of reclaiming and reuse by regrinding the corrugated roll body.
  • Patent Document 1 A method of quenching the surface of the corrugated roll substrate with high hardness is described in Patent Document 1.
  • a normal quenching temperature of 930 ° C. there is a problem of thermal deformation of the roll, and quenching at a low temperature has a problem that the quenching depth becomes uneven or the quenching hardness is insufficient. For this reason, carburizing or nitriding was performed in advance, and then quenching and tempering were performed at a relatively low temperature. Further, in order to reduce the distortion caused by quenching, quenching was performed only on the tooth-shaped step, and quenching and tempering took a long time of 15 hours or more.
  • the high-hardness laser build-up weld layer made of high carbon steel or alloy steel is formed by 1 mm or more, it is equivalent to sufficiently increasing the hardness of the corrugated roll base surface by itself. It is not necessary to harden the surface of the corrugated roll base by nitriding treatment, carbonitriding treatment, quenching treatment and tempering treatment as in Patent Document 1.
  • the surface of the corrugated roll substrate before laser build-up welding may be cured by nitriding or carbonitriding or quenching and tempering. In that case, the plastic deformation resistance (indentation preventing effect) is further enhanced.
  • the thickness of the laser build-up weld layer made of high carbon steel or alloy steel is preferably 1 to 10 mm.
  • the thickness is less than 1 mm, the resistance to plastic deformation such as dents and indentations becomes small when used as a corrugated roll.
  • the thickness exceeds 10 mm, the resistance to plastic deformation is saturated and hardly improved.
  • the high carbon steel or alloy steel a steel type that is hardened to HV650 or more by heat treatment is preferable, and specifically, carbon steel such as SKD61 or alloy steel such as SCM440 or SUS420 is preferable with 0.3% by weight or more of carbon. .
  • Hardness of hard chrome plating is HV1000 or more. Accordingly, when the surface of the corrugated roll on which the build-up weld layer of high carbon steel or alloy steel is formed as in the present invention, a hard chromium plating layer having a thickness of 10 to 200 ⁇ m is further coated to improve wear resistance and lubricity. Can do. When the thickness of the hard chrome plating layer is less than 10 ⁇ m, the life extension due to the improvement in wear resistance cannot be expected so much. On the other hand, if the thickness of the hard chrome plating layer exceeds 200 ⁇ m, the shape of the corrugated roll is so complex that it is very difficult to plate uniformly, so that the wear resistance and lubricity of the peaks are improved. Since the required film thickness cannot be obtained in the valley, the wear resistance and lubricity of the valley are not improved, resulting in a coating with non-uniform performance.
  • the present invention provides a corrugated roll substrate surface hardened by nitriding treatment or carbonitriding treatment or quenching treatment and tempering treatment in order to achieve a longer life of the corrugated roll having tooth-shaped step ridges.
  • a high wear-resistant coating layer that is strong and excellent in wear resistance is formed.
  • high-carbon steel or alloy steel which is easily hardened by hardening, is used as a matrix material.
  • a laser build-up weld layer using high and high hardness carbide ceramics as a dispersant is extremely effective for extending the life of the corrugated roll.
  • a high wear-resistant coating layer having high strength and excellent wear resistance can be formed with good adhesion by means of laser build-up welding, which is sequentially cooled, solidified, and deposited, and the life of the corrugated roll can be extended.
  • the diameter of the laser beam is as small as several millimeters, and the size of the pool in which the supplied “high carbon steel or alloy steel powder” or “mixed powder of high carbon steel or alloy steel and carbide” melts is about the same.
  • the amount of the corrugated roll substrate component mixed into the molten pool from the interface where the molten pool contacts the corrugated roll substrate is 10 wt.
  • a high-strength, high-abrasion-resistant coating layer having excellent adhesion can be obtained without impairing the wear resistance of the build-up weld layer.
  • the amount of the corrugated roll base component to the molten pool to be 2 to 6% by weight, the adhesion can be further improved without impairing the wear resistance of the build-up weld layer.
  • the molten pool In order to increase the quenching effect of the laser build-up weld layer, or to reduce the amount of the corrugated roll substrate component mixed into the molten pool from the interface where the molten pool contacts the corrugated roll substrate, the molten pool must be reduced. preferable.
  • the diameter of the molten pool is as small as several millimeters, and therefore the heat capacity is small. Reach. For example, even in the case of only alloy steel equivalent to SCM440 that does not contain carbide, a hardness of HV650 or higher can be obtained.
  • carbide ceramics is used as a dispersant in a matrix of high carbon steel or alloy steel, hardness of HV1100 or higher can be easily obtained by changing the amount of the dispersant.
  • the thickness of the laser overlay weld layer depends on the supply amount of "high carbon steel or alloy steel powder” or “mixed powder of high carbon steel or alloy steel and carbide", the energy of the laser beam, and the scanning speed of the laser beam. It can be adjusted by controlling. For example, the thickness of the laser build-up weld layer can be increased by reducing the scanning speed of the laser beam. On the other hand, when the thickness of the laser overlay weld layer is increased in this way, the amount of energy supplied per unit area increases, the depth of the molten pool increases, and the heat capacity increases, so the cooling rate decreases. Therefore, it becomes difficult to obtain high hardness, and thermal distortion increases.
  • a build-up weld layer having a desired thickness by laminating a plurality of thin build-up weld layers.
  • a thin laser overlay weld layer is formed on the thin laser overlay weld layer. A method of repeatedly laminating is preferable.
  • the corrugated roll shape having the corrugated roll dimensions before grinding is regenerated. make it possible.
  • this laser build-up welding method it is possible to greatly increase the number of times of recycling and reuse by regrinding the corrugated roll base.
  • the thickness of the high wear resistant coating layer is preferably 0.1 to 3 mm. If the thickness is less than 0.1 mm, a certain level of wear resistance can be obtained, but the life extension of the corrugated roll cannot be expected to meet the processing cost. In addition, since the wear resistance is improved corresponding to the thickness of the high wear-resistant coating layer, the life of the corrugated roll can be extended by setting the thickness of the high wear-resistant coating layer to 0.1 mm or more. On the other hand, if the thickness exceeds 3 mm, the probability of existence of defects in the build-up weld layer (high wear-resistant coating layer) increases, or other defects such as defects due to reduced toughness due to the increased hardness of the tooth profile step.
  • a method of repeatedly laminating a thin laser build-up weld layer on a thin laser build-up weld layer to increase the thickness of the high wear-resistant coating layer to increase the strength, or to make it thicker than the step depth of the tooth-shaped step Although it is possible to form the wear-resistant coating layer on the surface of the corrugated roll substrate and scrape the surplus into a stepped mountain having a predetermined size, the thickness of the high wear-resistant coating layer is preferably 3 mm or less.
  • the high wear-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 ceramics as the dispersed phase component is selected from one or more of tungsten carbide, molybdenum carbide, titanium carbide, niobium carbide and zirconium carbide having high hardness and excellent wear resistance and heat resistance.
  • the carbide ceramic content in the high wear-resistant coating layer is preferably 5 to 30% by weight. When the content of the carbide ceramic is less than 5% by weight, a remarkable improvement in hardness cannot be realized, and an improvement in wear resistance is not sufficient.
  • the content of the carbide ceramic exceeds 30% by weight, the toughness of the laser build-up weld layer is lowered, which is not preferable.
  • the carbide ceramic does not necessarily need to be uniformly dispersed in the high wear-resistant coating layer, and the outer portion of the high wear-resistant coating layer may be more than the inner portion.
  • the harder the content of the carbide ceramics the harder it is formed.
  • a thin laser build-up weld layer repeatedly on a thin laser build-up weld layer, it is formed.
  • the content of carbide ceramics is gradually increased from the inner side to the outer side, for example, 5% by weight, 10% by weight, 20% by weight, 30% by weight.
  • the inner side can be set to a hardness close to the hardness of the steel material of the corrugated roll base.
  • the corrugated roll is difficult to crack, cracks are not easily generated in the high wear resistant coating layer, and the high wear resistant coating layer is peeled off. There is an advantage that it is difficult to do.
  • the method of repeatedly laminating a thin laser build-up weld layer on a thin laser build-up weld layer is particularly effective when a thick high wear-resistant coating layer is formed on the tooth profile of the corrugated roll. If an attempt is made to form a thick, high wear-resistant coating layer on the tooth-shaped stepped hill, from “a powder component of high carbon steel or alloy steel” or “a mixed powder component of high carbon steel or alloy steel and carbide” Since the resulting molten pool becomes larger, there arises a problem that the molten metal flows down from the terrace before the molten metal in the molten pool solidifies. However, such a problem does not occur if the thin laser build-up weld layer is repeatedly laminated on the thin laser build-up weld layer. A wear coating layer can be formed.
  • the carbide ceramics dispersed in the high wear-resistant coating layer as a dispersed phase component has a smaller particle size and is more uniformly dispersed, so that the hardness and wear resistance of the high wear-resistant coating layer are improved. Accordingly, it is preferable to mix carbide ceramics of about several ⁇ m with a matrix of high carbon steel or alloy steel and then granulate to a particle size (20 to 150 ⁇ m) that is easy to laser build-up welding.
  • the matrix component of the high wear resistant coating layer is preferably a steel type that hardens to 650 or more by heat treatment.
  • carbon steel such as SKD61 and alloy steel such as SCM440 and SUS420 containing 0.3% by weight or more of carbon are preferable.
  • corrugated roll base conventionally, ordinary steel (structural carbon steel S43C having a C content of 0.30 to 0.38 wt%) or alloy steel (C content of 0.38 to 0.43) is used. It is common to use chromium molybdenum steel SCM440) and the like that are weight percent.
  • “Powder of high carbon steel or alloy steel” or “mixed powder of matrix of high carbon steel or alloy steel and carbide ceramic” used in the laser overlay welding method of the present invention has an average particle diameter of 20 to 150 ⁇ m. It is preferable.
  • the average particle diameter of “high carbon steel or alloy steel powder” or “mixed powder of high carbon steel or alloy steel matrix and carbide ceramics” is preferably 20 to 150 ⁇ m.
  • the shape of the tooth-shaped stepped mountain of the corrugated roll is not particularly limited, and for example, a known shape exemplified in Patent Documents 1 to 3 may be adopted as appropriate.
  • the shape of each tooth profile step is generally an arc on the cross section perpendicular to the axial direction of the step roll.
  • the shape of the step valley that meshes with the tooth step is also a circle.
  • the arc of the stepped portion and the stepped valley portion is smoothly connected via a straight portion or a curved portion having an appropriate length. (For example, JP 2007-98902 A)
  • Example 1 On the surface of a base material made of alloy steel SCM440 having a diameter of 100 mm and a length of 150 mm, carbon steel SKD61 powder, alloy steel SCM440 powder or stainless steel SUS420 powder containing 0.3 wt% or more of carbon is added to argon. While being supplied in a gas atmosphere, a laser beam was irradiated to form a laser overlay weld layer having a thickness of 5 mm. The particle size of each powder is adjusted to 40 to 90 ⁇ m, the powder is supplied at a supply speed of 6 or 8 g / min, the laser beam scanning speed is set to 300 or 600 mm / min, and the wavelength is from 950 to 1070 nm. A semiconductor laser having an output of 1300 W was irradiated. Table 1 shows the test conditions.
  • test condition A By repeating the above test condition A four times and test condition B eight times, a laser overlay weld layer having a thickness of about 5 mm is formed, the surface is processed flat by polishing, and then held at a test force of 200 g for 15 seconds. The Vickers hardness was measured. The measurement results are shown in Table 2.
  • test condition B in which the powder supply rate is lower and the laser beam scanning speed is faster than in test condition A, the molten pool becomes smaller and the molten metal is rapidly cooled, so that it is higher than in test condition A. It was found that the hardness was reached. Therefore, when laminating the laser build-up weld layer in multiple layers, lowering the powder supply rate from the lower layer to the upper layer and controlling the laser beam scanning speed to be higher can increase the hardness of the upper layer than the lower layer. Can be said to be convenient.
  • a laser build-up weld layer is formed, and after grinding and grinding, a tooth-shaped stepped mountain is formed with the desired dimensional accuracy, and then a hard chromium layer with a thickness of 0.01 to 0.2 mm A plating layer can be coated.
  • Example 2 Powder of carbon steel SKD61 containing 0.3% by weight or more of carbon on the surface of a base material made of alloy steel SCM440 having a diameter of 100 mm and a length of 150 mm, which has a hardness of HV560 by quenching and tempering, alloy steel While supplying SCM440 powder or stainless steel SUS420 powder in an argon gas atmosphere, a semiconductor laser was irradiated to form a laser overlay weld layer having a thickness of 5 mm.
  • each powder is adjusted to 40 to 90 ⁇ m, the powder is supplied at a supply speed of 6 or 8 g / min, the laser beam scanning speed is set to 300 or 600 mm / min, and the wavelength is from 950 to 1070 nm.
  • a semiconductor laser having an output of 1300 W was irradiated. Table 3 shows the test conditions.
  • test condition A By repeating the above test condition A four times and test condition B eight times, a laser overlay weld layer having a thickness of about 5 mm is formed, the surface is processed flat by polishing, and then held at a test force of 200 g for 15 seconds. The Vickers hardness was measured. The measurement results are shown in Table 4.
  • test condition B in which the powder supply rate is lower and the laser beam scanning speed is faster than in test condition A, the molten pool becomes smaller and the molten metal is rapidly cooled, so that it is higher than in test condition A. It was found that the hardness was reached. Therefore, when laminating the laser build-up weld layer in multiple layers, lowering the powder supply rate from the lower layer to the upper layer and controlling the laser beam scanning speed to be higher can increase the hardness of the upper layer than the lower layer. Can be said to be convenient. Further, as apparent from comparison between Table 2 and Table 4, the numerical values of Vickers hardness in Table 4 on the surface of the laser build-up weld layer are slightly improved from those in Table 2, but there is no significant difference.
  • Curing the corrugated roll substrate is advantageous from the viewpoint of plastic deformation resistance such as when a foreign object is caught, but when considering only abrasion wear, the corrugated roll substrate is not necessarily cured. It can be said that it is not necessary.
  • Example 3 Mixed powder obtained by mixing titanium carbide powder with an average particle size of 45 to 125 ⁇ m and SUS420 powder with an average particle size of 45 to 125 ⁇ m on the surface of alloy steel SCM440 (disk-shaped one having a diameter of 60 mm and a thickness of 10 mm) Is supplied at a supply speed of 8 g / min, a semiconductor laser having a laser beam scanning speed of 600 mm / min, a wavelength of 950 to 1070 nm and an output of 1300 W is irradiated, and titanium carbide is dispersed in SUS420 as a matrix. A laser overlay weld layer having a thickness of 2 mm was formed. The titanium carbide powder in the mixed powder was 10% by weight. Moreover, it replaced with the mixed powder of the said titanium carbide powder and SUS42 powder, and also produced the disk-shaped test piece which has a laser build-up welding layer of thickness 2mm which consists only of the said SUS420 powder.
  • a record disc-shaped test piece (Invention Example 1) having a laser build-up weld layer in which the titanium carbide powder is 10% by weight and the SUS420 powder is 90% by weight, and a record having a laser build-up weld layer of only SUS420 powder.
  • the disk-shaped test piece (Example 2 of the present invention) was evaluated for wear resistance by a Taber abrasion test using an H-10 wear wheel as a wear wheel as a counterpart material. Load Taber abrasion test and 9.8 N, 1000 the weight loss was measured for each rotation, to calculate the reduced volume (cm 3/1000 rotations) by abrasion from the coating density of the laser build-up welding layer. Table 5 shows the results of the Taber abrasion test.
  • Table 5 shows the Vickers hardness of the laser build-up weld layer. This Vickers hardness is a numerical value when held at a test force of 200 g for 15 seconds. As shown in Table 5, Example 1 of the present invention having a laser build-up weld layer made of a mixed powder of titanium carbide powder and SUS 420 powder has a laser build-up weld layer made of only SUS 420 powder. It can be seen that the volume reduced by wear is small and the Vickers hardness is improved.
  • Example 4 On the surface of alloy steel SCM440 (disk shape having a diameter of 60 mm and a thickness of 10 mm) which has a hardness of HV560 by quenching and tempering, tungsten carbide (WC) powder with an average particle size of 45 to 125 ⁇ m and an average particle size While supplying a mixed powder obtained by mixing alloy steel (SCM440) powder having a diameter of 45 to 125 ⁇ m at a supply speed of 8 g / min, a laser beam scanning speed is 600 mm / min, a wavelength is 950 to 1070 nm, and an output is 1300 W.
  • SCM440 disk shape having a diameter of 60 mm and a thickness of 10 mm
  • WC tungsten carbide
  • a semiconductor laser was irradiated to form a 2 mm thick laser build-up weld layer in which tungsten carbide was dispersed in SCM440 as a matrix.
  • the tungsten carbide content in the mixed powder was changed in the range of 0 to 30% by weight.
  • FIG. 1 shows a photograph of the cross-sectional structure of the sample in which the laser build-up weld layer was formed as described above.
  • the upper left shows a photograph of the cross-sectional structure of the laser overlay weld layer of only the matrix not containing tungsten carbide (SCM440), and the upper right shows that the content of tungsten carbide in the mixed powder is 5% by weight.
  • the lower right is the laser build-up with the content of tungsten carbide in the mixed powder being 20% by weight and the balance being the matrix (SCM440).
  • the photograph of the cross-sectional structure of a weld layer is shown.
  • FIG. 2 shows the relationship between the tungsten carbide content (% by weight) and the coating hardness (Vickers hardness HV) in the mixed powder of the sample on which the laser build-up weld layer is formed as described above.
  • This Vickers hardness is a numerical value when held at a test force of 200 g for 15 seconds.
  • the hardness of the laser-welded layer of the matrix only containing no tungsten carbide was HV650.
  • the hardness of the build-up weld layer improved and reached HV1112 when the content of tungsten carbide was 30% by weight.
  • a record disc-shaped test piece (Example 3 of the present invention) having a laser overlay weld layer in which the tungsten carbide powder is 5% by weight and the SCM440 powder is 95% by weight, and the tungsten carbide powder is 20% by weight and the SCM440.
  • Record disc-shaped test piece (invention example 4) having a laser build-up weld layer with 80% by weight of powder and record disc-like test piece having a laser build-up weld layer of only SCM440 powder (invention example 5) ), Wear resistance was evaluated by a Taber abrasion test using an H-10 wear wheel as a wear wheel as a counterpart material.
  • Dispersion in the laser build-up weld layer on the surface of SUS420 powder as a matrix on the surface of alloy steel SCM440 (disk shape with a diameter of 60 mm and a thickness of 10 mm) which has been hardened to HV560 by quenching and tempering SUS420 powder having an average particle diameter of 45 to 125 ⁇ m is selected from titanium carbide, molybdenum carbide, niobium carbide, and zirconium carbide as the phase ceramic carbide powder, and each carbide ceramic powder having an average particle diameter of 45 to 125 ⁇ m.
  • the average particle size is 45 on the surface of SCM440 (disc-shaped one having a diameter of 60 mm and a thickness of 10 mm).
  • Examples 6 to 10 of the present invention have a higher hardness than Comparative Example 1 having no laser build-up weld layer, less volume that decreases due to wear, and extremely excellent wear resistance. It can be seen that in addition, the inventive examples 6 to 9 having a laser build-up weld layer made of a mixed powder of carbide ceramic powder and SUS 420 powder are more worn by abrasion than the inventive example 10 having a laser build-up weld layer made only of SUS 420 powder. It can be seen that the volume to be reduced is very small and the Vickers hardness is remarkably improved.
  • the highly wear-resistant coating layer for corrugated rolls according to the present invention is a coating layer having excellent adhesion to the corrugated roll substrate, high strength and excellent wear resistance, excellent roll resistance to plastic deformation, Can also be used for mold applications.
  • the laser build-up weld layer for corrugated rolls according to the present invention has excellent adhesion to the corrugated roll substrate, high strength, and excellent plastic deformation resistance.
  • by coating the surface with hard chrome plating it is excellent in wear resistance, has a small friction coefficient, and can be used for rolls and large wear-resistant parts that easily cause dents.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
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  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Laser Beam Processing (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

Selon la présente invention, afin d'augmenter la durée de vie d'un cylindre cannelé ayant des arêtes de type dent et de prolonger de manière significative la régénération et le nombre de réutilisations du corps principal de cylindre par remeulage, une couche de soudure par accumulation d'acier à haute teneur en carbone ou d'un acier allié ayant une épaisseur de 1 mm à 10 mm est disposée sur la surface de portion d'arête de cylindre ondulé ou sur la totalité de la surface nervurée/évidée d'un corps principal de cylindre cannelé par un procédé de soudage par accumulation au laser.
PCT/JP2018/044535 2018-03-19 2018-12-04 Cylindre cannelé et son procédé de fabrication WO2019181085A1 (fr)

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JP2018050793A JP2021088726A (ja) 2018-03-19 2018-03-19 段ロールおよびその製造方法
JP2018079464A JP2021088728A (ja) 2018-04-17 2018-04-17 段ロールおよびその製造方法
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JPH01177956A (ja) * 1988-01-22 1989-07-14 Umetani Seisakusho:Kk 段ロールの製法
JPH07188940A (ja) * 1993-12-27 1995-07-25 Toyota Motor Corp 金属マトリックス中の炭化物の高密化方法
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JPS555126A (en) * 1978-06-26 1980-01-16 Mitsubishi Heavy Ind Ltd Surface hardening build-up welding method
JPH01177956A (ja) * 1988-01-22 1989-07-14 Umetani Seisakusho:Kk 段ロールの製法
JPH07188940A (ja) * 1993-12-27 1995-07-25 Toyota Motor Corp 金属マトリックス中の炭化物の高密化方法
JP2004276031A (ja) * 2003-03-12 2004-10-07 Sumitomo Metal Ind Ltd 曲げ成形部材及びその製造方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111331963A (zh) * 2020-03-27 2020-06-26 嘉兴吉森科技有限公司 一种多层复合钢及多层复合钢刀具的制作方法
CN111331963B (zh) * 2020-03-27 2024-01-05 嘉兴吉森科技有限公司 一种多层复合钢及多层复合钢刀具的制作方法

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