TWI259851B - Method and device for manufacturing inner-surface coated cylindrical body and inner-surface coated cylindrical body manufactured thereby - Google Patents

Abstract

To provide technology for forming an inner surface coating on the inner circumferential face of a cylindrical body with a self-fluxing alloy having a large surface hardness. Inside the cylindrical body 1 placed sideways, there is arranged a self-fluxing alloy powder uniformly in the axial direction of the cylindrical body, in a quantity suitable for the thickness of coating to be formed. After a powder layer of a uniform thickness is formed on the inner circumferential face by rotating the cylindrical body 1 at high speed, the powder inside is melted by heating the cylindrical body 1 to form a molten metal layer, then cooled and solidified to form the inner surface coating. In melting and solidifying the self-fluxing alloy, with a centrifugal force of 20-50G kept working on the inner circumferential face position of the cylindrical body 1, the hard ceramics fine particles of low specific gravity in the molten metal are integrated anti-centrifugally on the inner diameter side, increasing the density and hardness of the hard fine particles on the face of the inner surface coating.

Description

1259851 (1) The present invention relates to the application of excellent wear resistance and corrosion resistance to the inner surface of a metal cylinder such as a resin molding machine barrel and a slurry conveying steel tube. A manufacturing technique for coating the inner surface of a self-fluxing alloy coating layer. [Patent Document 1] Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. The inner cladding cylinder is well known. A method of forming an inner surface coating layer by using a centrifugal force on an inner circumferential surface of a cylindrical body (tube) is disclosed in Patent Document 1 (Japanese Unexamined Patent Publication No. Hei No. Hei No. Hei No. Hei No. Hei. When the self-fluxing alloy powder is supplied in a state of 3 G or more, a powder layer having a certain thickness is formed on the inner circumferential surface of the cylindrical body, and then the body of the cylinder is heated to a temperature at which the powder layer is in a sintered state, so that After the powder layer adheres to the circumferential surface of the cylinder body, the rotation is stopped, and then the inner peripheral surface temperature of the cylinder body is heated to a temperature higher than or equal to the melting temperature of the powder to melt the powder layer adhering to the inner circumferential surface of the cylinder body. A method of joining to a parent metal in the form of a diffusion, as a method of manufacturing such an inner coated cylinder. Further, the above-mentioned Patent Document 2 (Japanese Laid-Open Patent Publication No. Hei No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. After the alloy powder is placed in the body of the cylinder, the body of the cylinder is rotated such that the centrifugal force of the inner peripheral surface of the -7-1259851 (2) reaches 2 G or more, and the centrifugal force of the outer peripheral surface is 7 G or less, and the cylinder body is heated to the above. Above the melting temperature of the powder, the powder layer adhering to the inner peripheral surface of the cylindrical body is melted, and a method of joining to the parent metal along with the diffusion form ' is used. In either method, the self-fluxing alloy powder layer distributed on the inner surface of the cylinder body is heated and melted, and the diffusion form is bonded to the parent metal to form a dense and nearly non-porous joint which is well bonded to the parent metal. The inner surface coating layer of the self-fluxing alloy, in particular, the method described in Patent Document 2 is a centrifugal casting method in which the powder layer is melted and solidified in a state in which the cylindrical body is rotated, and can be formed by using centrifugal force. The molten metal layer on the inner circumferential surface of the cylindrical body further reduces the pores, and the inner coating layer of the formed self-fluxing alloy becomes a coating layer having high hardness and excellent wear resistance and corrosion resistance. SUMMARY OF THE INVENTION [Problems to be Solved by the Invention] Recently, the wear resistance of the inner surface coating layer formed on the cylindrical body has been further improved. It has been desired to further increase the hardness of the inner surface coating layer. In order to increase the hardness, it is considered that a self-fluxing alloy into which hard particles such as tungsten carbide are introduced can be used. However, it has been found that satisfactory results may not be obtained. In other words, in the method described in Patent Document 1, although the hard microparticles such as tungsten carbide are introduced, the hardness can be improved to some extent. However, compared with the method described in Patent Document 2, the amount of residual pores is large. Disadvantages. On the other hand, in the method described in Patent Document 2, even if hard fine particles such as tungsten carbide are introduced, the surface of the inner cladding layer is hardly found to have an improvement in hardness of -8 to 129,851 (3). It is said that this is because the specific gravity (and 15) of particles such as tungsten carbide, which are widely used, is larger than the specific gravity of the welded metal phase (8 to 9 times, so that it is away from the surface (inner peripheral surface) of the inner cladding layer). The movement, the surface does not exist very much. Moreover, the hard particles on the outer diameter side of the inner cladding layer, that is, the parent metal (the boundary region of the cylinder, thus hindering the inner cladding layer to the parent gold The resulting bonding action causes a decrease in the bonding force, thereby generating a new one. In view of the above, an object of the present invention is to provide a method for at least greatly improving the formation of an inner surface of an alloy on a circumferential surface of a cylindrical body. The technique of the surface hardness of the layer. [Means for Solving the Problem] In order to solve the above problem, the method for manufacturing the inner surface coated cylinder of the invention of claim 1 includes a cylindrical body having a circumferential surface. The centrifugal casting of the self-fluxing alloy on the inner circumferential surface is characterized in that the centrifugal casting is performed at a rotational speed of 〜50 G centrifugal force at the inner circumferential surface position to cast the casting The fine ceramic particles in the molten alloy melt have a specific gravity lower than that of the molten metal phase of the liquid, and are centrifugally collected on the inner diameter side of the centrifugal casting. In this state, the molten metal is solidified, and the low particles are aggregated on the inner diameter side. Since the inner surface coating layer is formed on the inner diameter side due to the formation of the low specific particles, the surface hardness of the inner surface becomes extremely large, and the inner hard surface having excellent wear resistance can be manufactured. The direction shifting sub-aggregate body is a problem of diffusion. The self-melting of centrifugal casting is a micro-coated layer covering the surface of a cylindrically formed metal melting system. The micro-coating layer is covered by a -9 - 1259851 (4) body. Further, as a result of the centrifugal accumulation of the hard ceramic fine particles on the inner diameter side of the inner coating layer, the concentration of the outer diameter side hard ceramic fine particles is lowered, so that the toughness can be improved and the diffusion bonding to the parent metal is hindered. Since the factor is reduced, the bonding force with the parent metal can be improved, and the inner cladding cylinder excellent in impact resistance and peeling resistance can be manufactured. According to the invention of claim 2, in the invention of claim 1, the fine particles having a lower weight than the welded metal gathered on the inner diameter side of the inner cladding layer are precipitated from the molten alloy of the self-fluxing alloy. Ceramic microparticles of any of the chromium-based borides, carbides, and borocarbides. As described above, the surface hardness of the inner cladding layer can be improved under the condition that a self-fluxing alloy such as a nickel self-fluxing alloy or a cobalt self-melting alloy is widely used as the self-fluxing alloy. According to the invention of claim 3, in the invention of claim 1, the fine particles having a lower weight than the welded metal gathered on the inner diameter side of the inner cladding layer are precipitated from the molten alloy of the self-fluxing alloy. The ceramic fine particles of any of the chromium-based boride, the carbide, and the borocarbide, and the hard component which is introduced into the melt of the self-fluxing alloy as a component other than the basic component of the self-fluxing alloy, does not exceed the specific gravity of the chromium-based ceramic Ceramic microparticles. Thus, the amount of hard fine particles collected on the inner diameter side can be increased, so that the surface hardness can be further improved. The invention of claim 4 is a method for manufacturing an inner coated cylindrical body, which comprises a coating process for centrifugally casting a self-fluxing alloy on the inner circumferential surface of a cylindrical inner peripheral cylindrical body It is characterized in that -10-(5) 1259851 is subjected to centrifugal casting in a state where the pressure of Ο 3 3 Μ P a is applied to the molten metal layer. Once the surface coating of the self-fluxing alloy is formed by centrifugal casting, the pores remaining in the coating layer become extremely small, and in the centrifugal casting, the surface of the molten metal is subjected to 0.3 to 3 Μ P a gas. Since the action is solidified in this state, the micropores remaining in the molten metal layer are reduced in volume by the compression of the gas pressure, so that the volume ratio of the remaining pores in the obtained inner surface layer is made smaller. Therefore, as a result of suppressing the effect of lowering the hardness of the inner surface coating layer due to the volume occupied by the pores, it is harder than that in the case of centrifugal casting without air pressure, so that abrasion resistance can be produced by this method. An inner surface covering with excellent damage. The invention of claim 5 is a method for manufacturing an inner surface coated cylinder, the method comprising: a coating process for centrifugally casting a self-fluxing alloy on an inner circumferential surface of a cylindrical inner circumferential surface of a cylindrical body; It is characterized in that the surface of the molten metal layer is subjected to centrifugal casting under the action of a pressure of 0.3 to 3 MPa, and the rotation speed of the tubular body is achieved in a state in which the surface of the molten metal layer is subjected to the air pressure. A rotational speed of 10 G or more centrifugal force is generated at the inner surface position. Once the surface of the molten metal layer is solidified by a pressure of 0.3 to 3 MP a, as described above, a volume is reduced by compressing the pores in the molten metal layer, but in this case, the pressurized gas sometimes It will penetrate the hole in the molten metal layer, and sometimes penetrates further to the interface between the molten metal and the body of the cylinder. Once solidified in this state, it will be larger than the inner pore of the inner cladding layer. A hole that leads to the surface, that is, a pinhole. In order to prevent such an in-plane and the amount of pressure is applied to the liquid in the front cylinder, the rotation speed of the cylinder body is set to -11 - !259851 (6), in the present invention, the rotation speed of the cylinder body is set to The rotation speed at which the centrifugal force of 10 G or more is generated at the inner circumferential surface position is applied to the molten metal by a large centrifugal force, and compressive stress is uniformly generated in all the regions including the thickness direction of the molten metal layer to form a pressurized gas. The pressure in the pressure-inducing behavior of the pressure-inducing action is relieved, and the air pressure is applied in this way to prevent the penetration of the pressurized gas. This makes it possible to form an inner cladding layer having almost no pinholes. The invention of claim 6 is a method of manufacturing an inner surface cladding cylinder, the method comprising the coating process of centrifugally casting a self-fluxing alloy on the inner circumferential surface of a cylindrical inner circumferential cylinder body The centrifugal casting is carried out in a state where the surface of the molten metal layer is subjected to a gas pressure of 0.3 to 3 MPa, and the rotating speed of the cylindrical body is made while the surface of the molten metal layer is subjected to the air pressure. A rotation speed of 20 to 50 G centrifugal force is generated at the position of the inner circumferential surface, in such a manner that the fine particles having a lower specific gravity than the molten metal phase of the molten metal present in the molten metal in the molten alloy during casting are de-centrifuged. The inner surface side of the centrifugal casting system was collected, and in this state, the molten metal was solidified to obtain an inner surface coating layer in which the low specific gravity fine particles were collected on the inner diameter side. That is, the present invention combines the features of the first aspect of the invention and the fourth aspect of the invention, and by applying a centrifugal force of 20 to 50 G, the hard microparticles are collected on the inner diameter side of the inner coating layer, thereby improving the surface hardness. At the same time, the pressure of 0.3 to 3 MP a can be used to make the number of remaining pores in the inner coating layer extremely small, so that the hardness can be increased, and the inner surface of the inner coating layer having higher hardness can be manufactured. -12-1259851 (7) The invention of claim 7 is the invention in the invention of claim 1 to 6 wherein the temperature of the molten iron melt in the centrifugal casting is attained with the self-melting The melting-solidification-related solidus line of the alloy is below the temperature at the 70% position of the solidus side in the solid-liquid coexistence temperature region of the liquidus. When centrifugal casting of a self-fluxing alloy is carried out, it is necessary to form a molten metal layer of a self-fluxing alloy on the surface to be cast, and at this time, when the temperature of the molten metal is increased, it is caused by a metal boride and a metal telluride which contribute to an increase in hardness. The melting and oxidation of the fine particles are consumed to lower the hardness, and further, the oxide is mixed. By setting the temperature of the molten metal to the above number, it is possible to prevent the hard fine particles from being reduced by melting and oxidation, or to mix the oxides, thereby forming a coating layer having a high hardness. The invention of claim 8 is the invention of claim 1 to 6, wherein the formation of the molten alloy layer of the self-fluxing alloy on the inner circumferential surface in the centrifugal casting is performed in the cylinder body The introduction of the self-fluxing alloy powder is carried out by heating and melting the powder under the rotation of the cylindrical body. The formation of the molten metal layer of the self-fluxing alloy on the inner peripheral surface of the cylindrical body may be performed by supplying the molten metal to the inside of the cylindrical body after the molten metal is formed outside the tubular body, but According to the present invention, the self-fusing alloy is supplied to the body of the cylinder in the form of a powder, and the method of heating and melting the same in the position enables easy handling of the self-fusing alloy, and the necessary equipment is also simplified. The invention of claim 9 is the invention of claim 1 to 6, wherein the formation of the self-fluxing alloy solution layer on the inner peripheral surface in the centrifugal casting is performed in the following manner: (1) Inside the horizontal body 13-(8) 1259851 body, the self-fluxing alloy powder corresponding to the thickness of the coating layer is equally disposed along the axial direction of the cylinder, and (2) the body of the cylinder is When the axis rotates at the center so as to achieve a rotational speed of 3 G or more centrifugal force at the position of the inner circumferential surface of the cylindrical body, the powder in the cylindrical body is also adhered in the circumferential direction of the cylindrical body. On the inner peripheral surface of the cylindrical body, the time required to reach a rotational speed capable of generating a centrifugal force of 3 G or more is not more than the time τ obtained by the following experimental formula (A): r (second) = 3 x 105 /D3 (A) (D is the inner diameter of the cylinder, mm) so as to suppress the powder uniformly disposed along the axial direction of the cylinder from moving in the axial direction of the cylinder, thereby forming a layer along the axial direction and the circumferential direction of the cylinder Powder with almost no thickness deviation The last layer is adhered to the inner circumferential surface of the cylinder body, and (3) while the cylinder body is continuously rotated, the body of the cylinder is heated to simultaneously raise the temperature of the entire cylinder, and the powder in the cylinder body is simultaneously Melt. When the above-mentioned (1) and (2) processes are used for supplying the powder, a self-fluxing alloy powder layer having a small thickness variation along the axial direction of the cylinder can be formed on the inner circumferential surface of the cylindrical body, and the powder layer can be heated and melted. When it is solidified, it can form an inner coating layer of a self-fusing alloy having a very small thickness deviation. The invention of claim 10 is the invention of claim 1 to 6, wherein the formation of the self-fluxing alloy solution layer on the inner peripheral surface in the centrifugal casting is introduced into the body of the cylinder The self-fluxing alloy powder 'heats and melts the powder under the rotation of the cylindrical body' simultaneously while melting the powder in the cylindrical body under reduced pressure. According to the structure of No.-14-1259851 (9), it is possible to effectively remove bubbles from the metal formed by powder melting, and also prevent oxidation of the molten metal layer, which has few pores and contributes to the increase in hardness of precipitated fine particles of oxygen, An inner coating layer with less oxide incorporation. The invention of claim 11 is an inner surface coated with an inner surface of a cylindrical coating body having a cylindrical inner peripheral surface, wherein the inner surface of the inner surface of the cylindrical body having a cylindrical inner peripheral surface is covered with a self-fluxing alloy. In the case where the fine particles of the chromium compound-based hard ceramic are distributed at a high density on the inner diameter side of the inner surface, the chromium component concentration is 20 degrees, and a hard layer having an increased hardness is formed. Such an inner surface coating has an increased hardness on the inner surface of the inner cladding layer (inner peripheral surface) and thus has excellent wear resistance. According to the invention of claim 12, in the invention of the patent application, in the outer diameter side of the inner cladding layer, the microscopic area ratio of the shaped medium is less than 0.1%. Floor. The non-metallic medium has few toughness and excellent toughness, and since the diffusion of the parent metal causes the bonding of the non-metallic medium to be small and the bonding strength of the body metal is high, the inner cladding layer becomes a good and The cleansing layer supporting surface of the parent metal is firmly bonded, and is not only excellent in abrasion resistance, but also impact resistance and peeling resistance. The invention of claim 13 of the patent application is an inner face manufacturing device which has horizontally The cylindrical body is supported and supported by the rotating device, and the cylindrical body is supported by the rotating body in the supporting liquid layer, and the inner peripheral surface is characterized by a 40% by mass in the coating layer. Due to the hard layer, the 11th non-metallic ruthenium layer is in contact with the cylinder of the cylinder which is excellent in the knot-like property of the toughness-quality layer and is also excellent in the rotation of the cylinder. -15 - 1259851 (10) The coating layer forms a powder supply device for a self-fluxing alloy powder having a thickness corresponding to a thickness, and a heating device for heating the entire length of the cylindrical body supported by the cylindrical body supporting the rotating device The cylindrical support rotating device can rotate the cylindrical body body at a rotational speed of 3 to 5 〇 at a position on the inner circumferential surface of the cylindrical body. In the manufacturing apparatus of such a configuration, the cylindrical body can be rotated by the cylindrical body. The body supported by the device supplies a powder of a self-fluxing alloy powder in a thickness corresponding to the thickness of the coating layer, and the body of the cylinder is rotated to form a self-fluxing alloy powder layer on the inner circumferential surface, and the self-melting alloy powder is heated and melted. This centrifugal prayer is formed by forming a molten metal layer, and the centrifugal casting is performed at a rotational speed at which a centrifugal force of 20 to 50 G is generated at the inner circumferential surface position. The fine particles in the hard ceramic fine particles in the molten metal of the casting are less than the fine particles of the molten metal phase of the molten metal, and are centrifugally collected on the inner diameter side of the centrifugal casting system, and the molten metal is solidified in this state. The inner surface coating layer in which the low specific gravity fine particles are collected on the inner diameter side can be obtained, whereby the inner surface coating layer having excellent surface hardness and abrasion resistance can be manufactured. The invention of claim 14 is an apparatus for manufacturing an inner cladding cylinder, wherein the cylinder body supports a rotating device that horizontally supports and rotates the cylinder body, A powder supply device for supplying a self-fluxing alloy powder having a thickness corresponding to a thickness of the coating layer to the cylindrical body supported by the cylindrical body supporting the rotating device, and heating the entire length of the cylindrical body supported by the cylindrical body supporting rotating device a heating device and a pressurizing device for applying a gas pressure of 0.3 to 3 MPa on the inner surface of the cylindrical body. In the manufacturing of the structure - 16 - (11) 1259851, the rotating device can be supported by the cylindrical body The body of the cylinder is supplied with a powder of a self-fluxing alloy in a thickness corresponding to the thickness of the coating layer, and the body of the cylinder is rotated to form a self-fluxing alloy powder layer on the inner peripheral surface, and then the self-fluxing alloy powder layer is melted by heating. To form a molten metal layer, followed by centrifugal casting to solidify it, and in the centrifugal casting, a molten metal melt can be formed from the inner circumferential surface. The process of solidifying the molten metal layer to the surface of the molten metal layer is carried out under the action of a pressure of 0.3 to 3 MPa, thereby producing an inner coating layer having a small amount of residual pores and a large hardness. The invention relates to an inner surface coated cylinder which is excellent in abrasion resistance. The invention of claim 15 is an apparatus for manufacturing an inner cladding cylinder, which has a cylinder support for horizontally supporting and rotating the cylinder body. The rotating device supplies a powder supply device for the self-fluxing alloy powder in a thickness corresponding to the thickness of the coating layer to the cylindrical body supported by the cylindrical body supporting the rotating device, and the cylindrical body supported by the cylindrical body supporting the rotating device a heating device that heats all the lengths, and a pressing device that applies a pressure of 0.3 to 3 MPa on the inner surface of the cylindrical body, and the cylindrical supporting rotating device can generate the 10G of the cylindrical body at a position on the inner circumferential surface of the cylindrical body The rotation speed of the above centrifugal force is rotated. In the manufacturing apparatus of such a structure, the cylindrical body can be centrifugally cast in a state where the surface of the metal solution layer in the cylindrical body body is subjected to a pressure of 0.3 to 3 MPa, and the cylindrical body can be now in the inner circumference of the cylindrical body. When the position is rotated at a rotational speed of 10 G or more, it is possible to prevent the pressurized gas from penetrating through the pores in the molten metal layer or through the interface between the molten metal layer and the body of the cylinder, thereby forming almost -17·1259851 ( 12) The inner coating without pinholes. The invention of claim i is an apparatus for manufacturing an inner-faced cylindrical body, wherein a cylindrical body supporting a rotating device that horizontally supports and rotates the cylindrical body body is supported by the rotating body supporting the rotating body The inside of the cylindrical body is supplied with a powder supply device of a self-fluxing alloy powder in an amount corresponding to the thickness of the coating layer, and a heating device for heating the entire length of the cylindrical body supported by the cylindrical supporting rotating device, and 0.3 to 3 MPa is provided. A pressurizing device that acts on the inner surface of the cylindrical body by the air pressure, and the cylindrical supporting rotating device can rotate the tubular body at a rotational speed of 20 to 50 G centrifugal force at a position of a circumferential surface of the cylindrical body. In the manufacturing apparatus of such a structure, centrifugal casting can be performed in a state where the surface of the metal solution layer in the cylindrical body body is subjected to a pressure of 0.3 to 3 MPa, and the cylindrical body can be positioned at the circumferential surface of the cylindrical body at this time. Rotating at a rotational speed of 20~50G centrifugal force, under the pressure of 〇·3~3MPa, not only can the number of residual pores in the inner coating layer be extremely small, but the hardness can be increased, and the hard microparticles can be reversed by applying 20~50G centrifugal force. The inner surface side of the inner coating layer is centrifugally collected to increase the surface hardness, so that the inner surface coating cylinder having the inner surface coating layer having a higher hardness can be produced. The invention of claim 17 is the invention of claim 1 to 3, wherein the heating device has a circumferential direction of the cylindrical body supported by the cylindrical support rotating device over the entire length of the tubular body Inductive coil for induction heating between cells. According to this configuration, the entire length of the tubular body can be heated simultaneously and rapidly, so that the self-fusing alloy powder layer can be rapidly heated and melted. -18-1259851 (13) In summary, the present invention has such a structure that when the inner coating surface of the self-fluxing alloy is formed on the inner circumferential surface of the cylindrical body by centrifugal casting, the cylinder can be The position of the inner surface of the body is in a state of 20 0 to 50 G centrifugal force or the surface of the molten metal layer is subjected to a pressure of 0 · 3 〜 3 Μ P a , which is compared with the inner coating layer formed by the existing method. The same self-fluxing alloy can be used to extract the surface hardness of the inner surface coating layer, and has the effect of being able to produce an inner surface coating cylinder excellent in abrasion resistance. Further, the inner coated cylinder produced by the present invention has excellent wear resistance, and when it is used for a resin molding machine barrel and a steel pipe for slurry conveyance, it is possible to obtain an excellent wear resistance and a long service life. Resin molding machine barrel and slurry conveying steel pipe and other products. [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figs. 1(a) and 1(b) are schematic perspective views showing the state in which the inner facing cylindrical body manufacturing apparatus is in a different state according to the embodiment of the present invention, and Figs. 2(a), (b), (c), (d) is a schematic cross-sectional view showing a procedure for forming a self-fusing alloy inner surface coating layer on the inner circumferential surface of the cylindrical body by the manufacturing apparatus of Fig. 1, and 1 is a cylindrical body having a cylindrical inner circumferential surface. . The cylindrical body 1 is optional as long as it is made of a metal, and typical examples thereof include various steel tubes such as a barrel for a resin molding machine barrel and a slurry conveying steel tube. 2 is a powder of a self-fluxing alloy for forming an inner surface coating layer on the inner circumferential surface of the cylindrical body 1. Examples of the self-fluxing alloy forming the coating layer include widely used nickel self-fluxing alloys (for example, SFNi4 of JIS, 83 03, etc.) and widely used cobalt self-fluxing alloys (for example, JIS, SFC 3 of 8303, etc.). . And if necessary, you can also use these in -19- 1259851 (14)

The self-fusing alloy is introduced into the self-fluxing alloy metal strontium solution, and any one of the chromium-based borides, carbides, and borides is equal or under the specific gravity, specifically, the specific gravity is 7 or less. Hard ceramics (for example, BN: specific gravity 2.34' B4C: specific gravity 2.47, Si3N4: specific gravity 3.2, SiC: specific gravity 3_21, V2O5: specific gravity 3.36, V〇2: specific gravity 4.34, TiB2: specific gravity 4·5, V203: specific gravity 4.8, TiC : Microparticles having a specific gravity of 4.94, TiB: specific gravity of 5.09, TiN: specific gravity of 5.43, V0: specific gravity of 5.76, VC: specific gravity of 5.77, ZrB2: specific gravity of 6.08, ZrC: specific gravity of 6_73, NbB2: specific gravity of 6.97, or a composite thereof. 3 is a cylindrical body supporting rotation device that horizontally supports and rotates the cylindrical body 1. In the present embodiment, the two receiving rolls 4 that support the lower side of the cylindrical body 1 are pressed against the upper side of the cylindrical body 1. 5 (omitted in FIG. 1), a shift motor 6 that rotationally drives the two receiving rolls 4, and a control device 7 that controls the rotational speed and acceleration of the receiving roller 4 by the shift motor 6. The shift motor 6 and the control device 7 are capable of rotating the tubular body 1 at a rotational speed at which the inner circumferential surface of the cylindrical body 1 is subjected to a centrifugal force of 20 to 50 G. Further, the structure can accelerate the rotational speed to a centrifugal force of 3 g or more in a short time not exceeding the time τ obtained by the above experimental formula (A). 9 is a powder supply device for supplying a self-fluxing alloy powder having a thickness corresponding to the thickness of the coating layer to the inside of the cylindrical body 1 supported by the supporting rotating device 3. In the present embodiment, the powder supply pipe j is fed from the end portion. 〇, and a hopper trolley worker or the like that holds the powder supply pipe 10 and is movable in the tube axis direction. 13 is a heating device for heating the length of the cylindrical body supported by the cylindrical support rotating device 3. In the present embodiment, the circumferential direction of the cylindrical body 1 can be used along the entire length of the tubular body -20-(15) 1259851. The induction coil of the surface heating coil that inductively heats the small section. Next, a method of manufacturing the inner cladding cylinder by the apparatus for manufacturing the inner cladding cylinder of the above configuration will be described. First, the metal body i of the metal is prepared, and the surface roughness suitable for covering the inner peripheral surface thereof is ascertained. Here, the surface roughness of the inner peripheral surface of the cylindrical body i is not particularly limited, but is preferably selected to be about 5 to 20 μm Ra. The surface roughness within this range can be easily formed by the inner surface blasting method which has the operation of the chamfer inner peripheral surface. After the surface roughness of the inner circumferential surface of the cylindrical body is found to be in the range of 5 to 20 μm Ra, and the self-fluxing alloy powder is supplied into the cylindrical body 1 and uniformly arranged along the axis, the cylindrical body 1 is made to have a local velocity. In the acceleration process when rotating so as to be evenly distributed in the circumferential direction, it is possible to suppress the phenomenon of uneven thickness due to the movement of the powder in the axial direction of the cylinder, which is an advantage. This is considered to be because there are some irregularities on the inner peripheral surface of the cylindrical body 1, and the suction of the powder in the axial direction of the cylinder can be suppressed. The higher the surface roughness of the inner surface of the cylinder body, the more significant the effect of suppressing the tendency of the powder to move along the axial direction of the cylinder. To use this suppression effect, the surface roughness should be set to 5 μRa or more as described above. However, if the enthalpy is set to 20 μm or more, it is hardly expected that the effect of suppressing the movement of the powder is further increased. On the other hand, rough surface processing leads to increased costs. In view of these factors, it is preferable to limit the surface roughness to 20 μm Ra. Next, the cylindrical body 1 is placed on the cylindrical support rotating device 3 so as to be in a horizontal state, and the inside of the horizontally cylindrical body 1 is uniformly disposed in the axial direction of the tubular body to be equal to the thickness of the coating layer. The amount of self-melting alloy powder-21 - 1259851 (16) at the end of the 2 operation. Specifically, the powder supply tube i of the powder supply device 9 is inserted into the inside of the cylindrical body 1, and a predetermined amount of self-fluxing alloy powder 2 is loaded into an appropriate position (one or more) in the axial direction of the cylindrical body i (refer to In Fig. 2(a)), the powder supply pipe 1 is pulled out, and the both ends of the cylindrical body 1 are blocked by a suitable cover 15 and then the cylindrical body 1 is not covered by the powder in the cylindrical body 1. The speed at which the cylindrical body is spread in the circumferential direction is gradually rotated. Since the powder 2 inserted into the cylindrical body 1 is evenly spread in the axial direction of the cylindrical body 1 by this rotation, it can be equally arranged along the axial direction (refer to Fig. 2(b)). According to this method, when the self-fluxing alloy powder is charged into the cylindrical body 1 by the powder supply tube 10, since the powder is allowed to be unevenly distributed in the axial direction of the cylinder, there is an advantage that the powder loading operation is easy. Here, the operation of uniformly arranging the self-fluxing alloy powder in the cylinder body 1 in the axial direction of the cylinder in a thickness corresponding to the thickness of the coating layer is not limited to the above method, and other methods may be employed. For example, the powder supply pipe 10 is inserted into the tubular body 1 and the hopper hopper i is moved at a constant speed in the cylinder axis direction while discharging the powder at a constant flow rate from the end portion thereof. 1 The powder is uniformly disposed along the axial direction of the cylinder. In addition, as the powder supply tube 10' in which the powder is placed in the cylindrical body 1, a slit having a slit-like discharge port extending in the axial direction or a plurality of holes arranged side by side in the axial direction may be formed on the side surface thereof. The supply pipe of the outlet is uniformly filled with the self-fluxing alloy powder in the axial direction of the powder supply pipe 10 by closing the discharge port or facing upward, and the powder supply pipe 1 is inserted into the cylindrical body 1, and then It is also possible to arrange the powder evenly in the axial direction by opening the discharge port or causing the self-fluxing alloy powder in the powder supply pipe 10 to be supplied to the inside of the cylindrical body 1 by the method of -22·(17) 1259851. After the self-fluxing alloy powder 2 is uniformly disposed in the cylindrical body 1 in the direction of the cylinder axis, the cylindrical body 1 is rotated about the axis thereof by the cylindrical body supporting the rotating device 3, so that the rotational speed is within the cylindrical body 1 A centrifugal force of 20 to 50 G is generated at the circumferential position. By this rotation, the self-fluxing alloy powder 2 placed in the cylindrical body 1 is evenly spread in the circumferential direction of the cylindrical body and adhered to the inner peripheral surface of the cylindrical body (see Fig. 2(c)). In this way, the powder 2' which is uniformly spread in the circumferential direction of the tubular body and adhered to the circumferential surface of the cylindrical body body 2' produces a centrifugal force at a centrifugal force of 3 G or more at the inner circumferential surface position, which is hardly on the inner circumference of the cylindrical body. By moving and maintaining its position, it is possible to form and maintain a powder layer of uniform wall thickness on the inner peripheral surface of the cylindrical body. However, in the acceleration process of the tubular body 1, when the inner circumferential surface position generates a centrifugal force of about 1 to 2 G centrifugal force, although the powder is once adhered to the inner circumferential surface of the cylinder body, the binding force due to the centrifugal force is small. Under the action of microscopic directionality on the inner circumferential surface of the cylindrical body 1, the powder moves to the left and right positions, and the powder moves in the axial direction of the cylinder. This tends to cause uneven thickness in the axial direction of the cylinder. Therefore, during the rotation from the cylinder body 1 to the acceleration to the predetermined rotation speed, the rotation speed should be accelerated in a short time so that the centrifugal force of the inner circumferential surface of the cylinder body can generate 3 G or more, so that the cylinder can be made The thickness unevenness in the body axis direction hardly occurs (it should be within an allowable range even if it is generated). Specifically, for the cylinder body 1 in which the surface roughness of the inner peripheral surface is 5 to 20 μm Ra, it should not exceed the following experimental formula (A): r (second) = 3 χ 105 / ϋ 3 ... (A -23- (18) 1259851 In a short time of the obtained time τ, the cylindrical body 1 is subjected to a rotational speed at which the rotational speed of the tubular body 1 reaches a centrifugal force of 3 G or more in the short time. This method enables the formation and adhesion of the self-powder layer having a thickness which is extremely small along the axial direction of the cylinder on the f-face of the cylinder. In the case where the cylindrical body 1 is rotated to a predetermined rotational speed of 20 to a heart force at the inner circumferential surface position, the cylindrical body 1 is held in the rotation and continues to rotate. In the state where the cylindrical body 2 is heated by the heating device 13, the powder 2 in the cylindrical body is melted, and the molten metal can be formed on the inner peripheral surface of the cylindrical body 1 in the molten state. Here, the molten state in the molten metal does not necessarily mean only a state in which the powder is completely melted, and also refers to a state in which at least a part of the powder is melted, and can be melted and adhered to the circumferential surface of the cylindrical body, and the heating device 13 is used. The heating temperature of the cylindrical body 1 can be selected to be at least partially dissolved between the powders and adhered to the circumferential surface of the body of the cylinder, and can be selected to exceed In the self-fluxing alloy state diagram, on the one hand, the higher the heating temperature of the cylindrical body 1 is, the larger the powder is melted, and finally the molten state is completely formed. Although it is considered that the powder can be formed to be denser and has no pores and a molten adhesion coating layer in the molten state, according to the findings of the present inventors, even if it is completely melted, it is possible to form a dense and non-porous and pinhole melting. Covered layer. Moreover, once the powder is in a completely molten state, although the flow property is such that the thickness of the coating layer is equal along the axial direction of the cylinder, due to the acceleration, the inner circumference of the crucible 1 is melted at the D / 50G speed of the crucible 1 . Thus, the entire layer of the melt layer is powdered. Therefore, it can be fused to the temperature and temperature. At the end of the ratio, the powder of the completely pinhole does not adhere to the molten layer, and even if the thickness of the powder layer adhered to the inner surface of the body of the cylinder body - 24 - (19) 1259851 can be modified, as described above, If the powder layer is formed in a state where there is almost no thickness unevenness, it is not necessary to correct the thickness unevenness in a completely molten state. On the other hand, once the powder is completely melted, it is necessary to increase the heating temperature of the cylindrical body 1, which of course increases the consumption of heat energy, and the heating time is also prolonged. Moreover, once in a completely molten state exceeding the liquidus temperature of the self-fluxing alloy, particles such as metal boride or metal telluride which contribute to increase the hardness of the self-melting alloy may be reduced due to melting or oxidation consumption, thereby causing a decrease in hardness or Disadvantages of mixing oxides. In consideration of these factors, the upper limit of the heating temperature of the barrel body 1 should be selected such that the temperature of the self-fluxing alloy in the body of the cylinder does not exceed the liquidus temperature associated with the melting of the self-fluxing alloy; more preferably, the arrival of the self-fluxing alloy solution The temperature is lower than the temperature from the liquidus temperature associated with the melting and solidification of the self-fusing alloy to the 70% position of the solidus line within the solid-liquid coexistence temperature. The rotational speed of the cylindrical body 1 when the self-fluxing alloy powder layer is heated and melted is determined to be a rotational speed at which a centrifugal force of 20 to 50 G is generated as described above. However, it has been known in the past that when the self-fluxing alloy powder layer formed on the inner surface of the cylinder body is melted and densified, the effect of removing the air bubbles from the silicon alloy solution by increasing the centrifugal force of the cylindrical body 1 is increased. In the method described in Patent Document 2, the melting treatment is performed under a centrifugal force of 2 G or more. However, the effect of removing the bubbles by the centrifugal force increases as the centrifugal force increases before the centrifugal force is increased to 7 to 8 G. However, even if the centrifugal force increases above the number, the effect of removing the bubbles hardly increases, so that the centrifugal force at the time is at best In the present embodiment -25 - (20) 1259851, a centrifugal force of 20 to 50 G is used. Due to the centrifugal force of such a high G, not only the effect of removing bubbles is good, but also the hard ceramic particles having a specific gravity lower than that of the molten metal phase in the molten metal have the effect of centrifugally collecting toward the inner diameter side, so that the surface can be greatly improved. The hardness of the layer. That is to say, the fusion metal in the molten metal melt is Ni (specific gravity 8.9), Cr (specific gravity 8.5), Co (specific gravity 8.85), etc., and the hard ceramic microparticles present in the alloy melt are in the range of 6 to 7. A chromium-based boride (CrB: specific gravity 6.2), a carbide (Cr3C2: specific gravity 6.68, Cr7C3: specific gravity: 6.92) precipitated from the molten metal, or a boron carbide compounded by the composite (about 6 to 7 specific gravity) )Wait. Although the specific gravity of these hard ceramic fine particles is lower than that of the welded metal phase, the difference is not large. Therefore, under the centrifugal force of about 3 to 8 G which has been conventionally performed, it is almost impossible to centrifugally concentrate on the inner diameter side of the molten metal layer. The high-G centrifugal force of ~50 G can achieve reverse centrifugal concentration on the inner diameter side. The time during which the self-melting alloy powder on the inner peripheral surface of the cylindrical body 1 is maintained in a molten state is preferably set in the range of 10 to 180 seconds. When the time is less than 10 seconds, the diffusion bonding of the molten metal to the parent metal is insufficient, or the low specific gravity ceramic fine particles are insufficiently aggregated on the inner diameter side; if it is more than 180 seconds, the molten metal is in the molten metal. Hard ceramic fine particles are reduced by melting or oxidation consumption, and there is a disadvantage that hardness cannot be increased or oxides are mixed. In view of these circumstances, in the case where the cylindrical body 1 is heated so that the powder 2 in the cylindrical body is melted and maintained in a molten state, the heating of the cylindrical body 1 is set such that the temperature of the self-fluxing alloy powder inside exceeds the self. The solidus temperature of the molten alloy is melted, but does not exceed the temperature of the liquidus, and the holding time of the melted -26-(21) 1259851 is preferably selected from 10 to 180 seconds. After the self-fluxing alloy powder is held in a molten state for a predetermined time, the cylindrical body 1 is continuously transferred to the cooling stage under rotation to solidify the molten self-melting alloy in the cylindrical body 1. This cooling may be carried out by any cooling method such as cooling in the furnace or cooling, or cooling, air cooling, etc., but if the cooling is too fast, the solidified self-fluxing alloy coating may be cracked by thermal stress. Therefore, it is necessary to experimentally find a cooling system that does not cause cracks and that is as short as possible. As described above, the self-fluxing alloy is once melted and adhered to the entire circumference of the cylindrical body, and a self-fluxing alloy coating layer can be formed, and then the cylindrical body 1 is taken out from the apparatus as shown in Fig. 2(d). The inner surface covering cylinder 20 having the self-fusing alloy inner surface coating layer 21 on the inner circumferential surface of the cylindrical body 1 can be formed. The inner surface of the self-fluxing alloy coating layer 21 has an extremely high hardness on the surface (inner peripheral surface), and the thickness deviation in the axial direction of the cylinder and the circumferential direction is extremely small. When the cross section of the inner cladding layer 21 of the inner cladding cylinder 20 obtained by the above process was observed with a microscope, it was found that, as schematically shown in Fig. 3, the inner cladding layer 21 had the surface layer 21a. A layered structure composed of the intermediate layer 21b and the boundary layer 21c. The surface layer 21a is a structure in which a white cross-shaped structure and a black cross-shaped structure are mixed, and each of the intersecting-like structures becomes a finely distributed structure of a plurality of fine-particle precipitates in a weld metal (base metal). Such a surface layer 2 1 a exhibits an extremely high hardness (e.g., 818 to 927 Hv) as shown in Examples 1 to 4 to be described later. It can be seen that the fine particles precipitated in a plate shape, a block shape, and a spot shape, and the chemical composition thereof was measured, and it was found that most of the metal components were chromium. Therefore, it can be considered that the surface layer 2 1 a is improved by high-density distribution of chromium-based borides, carbides, borides, and the like. The 27-(22) 1259851 hard ceramic fine particles are distributed at a high density. A hard layer of hardness, thus showing high hardness. The intermediate layer 21b is a structure in which fine particles of precipitates in the base metal are dispersed in a small amount, and the hardness thereof is lower than that of the surface layer. The boundary layer 2 1 c becomes a layered structure in which a eutectic precipitate in the base metal is dispersed in a very small amount and has a lower hardness. It is considered that this is because the centrifugal casting at high G results that the non-metallic filler such as hard ceramic fine particles contained in the base metal moves toward the inner diameter side, and the boundary layer 2 1 c becomes almost a matrix composed of the base metal. The sake of the net layer. Since the boundary layer 2 1 c is a clean layer having almost no non-metallic media, the toughness is excellent, and the intermediate layer 2 1 b is formed to form a structure corresponding to the inclined structure to support the hard surface layer 21a well, and the parent metal (The barrel body 1) forms a joint with good diffusion. Thus, the inner surface coating layer 2 1 has not only the surface (internal peripheral surface) but also has excellent toughness and good adhesion to the parent metal, and its abrasion resistance, impact resistance and peeling resistance. The surface layer 21a of the inner surface coating layer 21 described above is also excellent in hardness, and the higher the chromium component concentration, the higher the hardness and the more excellent the abrasion resistance. However, if the hardness is too high, it is difficult to manufacture. Therefore, the chromium component concentration of the surface layer 21a is preferably about 20 to 40% by mass. The less the toughness of the boundary layer 2 1 c non-metallic media, the better the bonding property with the diffusion of the parent metal, in particular, the microscopic area ratio of the non-metallic media is preferably 0.1% or less. . In the above embodiment, the rotating main body 1 is heated to melt the inner self-fluxing alloy powder, and the inside of the cylinder body is in a state in which air enters. However, the present invention is not limited to this configuration, and the present invention can be used in the cylinder. The body body -28-1259851 (23) is carried out under reduced pressure, so that the pores in the coating layer can be minimized, or in the absence of an oxidizing atmosphere. Thus, the oxidation of the self-fluxing alloy can be minimized. Fig. 4 is a view showing an example of a manufacturing apparatus for performing a self-fluxing alloy powder heating operation under a reduced pressure state in the cylindrical body. In the manufacturing apparatus, the cover 15A attached to one end of the tubular body 1 is connected to the connecting pipe 25, and the connecting pipe 25 is connected to the pipe 27 by a rotary joint 26 to which an on-off valve 28 and a vacuum pump 29 are connected. The other structure is the same as that of the manufacturing apparatus shown in Fig. 1. When the manufacturing apparatus of Fig. 4 is used, as shown in Fig. 2(a), after the self-fusing alloy powder 2 is supplied into the cylindrical body 1, as shown in Fig. 4, at both ends of the cylindrical body 1. The lids 15 and 15A are attached, and the inside of the cylinder main body 1 is closed, and the inside is connected to the vacuum pump 29, and the vacuum pump 29 is activated to depressurize the inside of the cylinder main body 1, and the same as in the above-described embodiment. The cylindrical body 1 is rotated, and a centrifugal force of 20 to 50 G is applied to the inner peripheral surface of the cylindrical body 1, and in this state, the self-melting alloy powder is heated and melted and solidified. This makes it possible to form an inner cladding layer having an extremely high hardness surface layer. Further, since the inside of the cylindrical body 1 is under reduced pressure during heating and melting, the effect of removing bubbles in the molten metal is high, and an inner coating layer having a small remaining pore can be formed. Further, instead of using the vacuum pump 29, it is connected to a device for supplying an inert gas, and the inside of the cylindrical body 1 is filled with an inert gas to form an atmosphere of no oxidizing gas, and in this state, heating, melting and solidification of the self-fluxing alloy powder are performed. 'Also can minimize the oxidation of the self-fluxing alloy. In each embodiment described above, 'the time at which the self-fusing alloy powder layer is formed on the inner peripheral surface of the cylindrical body 1' is already at the position of the inner peripheral surface of the cylindrical body at the centrifugal force of 20 to 50 G. The present invention is not limited to the case of the case -29-(24) 1259851, and the cylindrical body 1 may be rotated at a rotational speed of 3 G or more by applying an appropriate centrifugal force to the inner circumferential surface position when the self-fluxing alloy powder layer is formed. After the molten powder layer is heated in this state to form a molten metal, the rotation speed of the cylindrical body 1 is increased, and the centrifugal force of 20 to 50 G is applied to solidify the mixture in this state. Fig. 5 is a view showing an inner-coated cylindrical body manufacturing apparatus used in another embodiment of the present invention. In the manufacturing apparatus of the embodiment, the cover 15A attached to one end of the tubular body 1 is connected to the connection pipe 25 by the rotary joint 26 and the switch valve 28, as in the embodiment shown in Fig. 4 . Although the piping 27 is connected, unlike the embodiment shown in Fig. 4, the piping 27 is connected to a pressurizing device having a pressure regulating valve 31 and a compressor 32. The structure of the pressurizing device enables the cylinder body 1 to be subjected to at least a gas pressure of 0.3 to 3 MPa. Alternatively, a pressurized steel cylinder may be used instead of the compressor 3 2 . In this case, the structure in which the pressurized cylinder is rotated together with the cylindrical body 1 can be omitted, and the rotary joint 26 can be omitted. In the case of using a pressurized cylinder, a pressurized cylinder in which an inert atmosphere such as nitrogen is sealed is preferred. The other structure is the same as that of the embodiment of Fig. 1. Next, a method of manufacturing the inner coated cylinder using the manufacturing apparatus shown in Fig. 5 will be described. In the present embodiment, the self-melting alloy powder 2 is also supplied into the cylindrical body 1 (see Fig. 2(a)), and then both ends of the cylindrical body 1 are closed by the covers 15 and 15 A, so that the cylindrical body 1 is slowly lowered. Rotate to allow the powder 2 to spread evenly along the axis. The process up to this point is the same as the case of using the manufacturing apparatus shown in Fig. 1. After the -30-(25) 1259851 of the self-fluxing alloy powder 2 is disposed in the cylindrical body 1 in the axial direction of the cylinder, the cylinder is supported by the rotating device 3 to accelerate until the inner circumferential surface of the cylindrical body 1 is 3 G or more. The centrifugal force is preferably a predetermined rotational speed at which a centrifugal force of 10 G or more is generated, and the rotational speed is maintained. As a result, the self-fluxing alloy powder 2 loaded into the cylindrical body 1 is uniformly spread along the circumferential direction of the cylindrical body and adhered to the inner peripheral surface of the cylindrical body. In this case, when the cylindrical body 1 is accelerated at a predetermined rotational speed, the powder layer formed on the inner circumferential surface of the cylindrical body 1 hardly causes thickness deviation in the axial direction of the cylinder (even within the allowable range even when generated). When the rotational speed of the centrifugal force of 3 G or more is generated in a short time in the inner circumferential surface position, specifically, the cylindrical body 1 having a surface roughness of 5 to 20 μm on the inner circumferential surface is applied to the cylindrical body 1 is accelerated so that the rotation speed of the cylindrical body 1 reaches the above-mentioned 3 in a short time not exceeding the time r obtained by the following experimental formula (A): r (second) = 3x105 / D3 (A) The rotational speed of the centrifugal force above G. In this manner, the self-fluxing alloy powder layer having a thickness which is extremely small in the axial direction of the cylinder can be formed and adhered to the inner circumferential surface of the cylindrical body 1. After reaching a predetermined rotational speed at which a centrifugal force of 3 G or more is generated, the cylindrical body 1 is held at the rotational speed, and the cylindrical body 1 is heated by the heating device 13 under the condition of continued rotation so that the powder in the cylindrical body 1 is made. 2 After melting, it remains in a molten state. Thus, a molten layer of a self-fluxing alloy can be formed on the inner peripheral surface of the cylindrical body 1. In this case, the temperature at which the tubular body 1 is heated by the heating device 13 can be appropriately selected so that the self-fluxing alloy powder adhered to the inner peripheral surface of the cylindrical body is at least partially melted, so that the powders can be mutually-31 - (26) 1259851 and the powder is fused to the inner surface of the cylinder body. Specifically, the temperature of the solidus line in the self-fluxing alloy state diagram can be selected. After the molten metal layer is formed in the cylindrical body 1, the compressor 32 is started to cause the molten metal surface in the cylindrical body 1 to be under the pressure of 0.3 to 3 MPa. Thus, the pores remaining in the molten metal are compressed under the action of the gas pressure to a reduced volume and become extremely fine. Here, the reason why the gas pressure acting on the surface of the molten metal is set to 0 · 3 to 3 Μ P a is that, below this range, the effect of reducing the pore volume is small, and at a pressure exceeding the range, the gas pressure is The increase not only greatly increases the cost of the equipment, but also the effect of reducing the pore volume is hardly increased. It is preferable that the self-fluxing alloy powder on the inner peripheral surface of the cylindrical body 1 is maintained in a molten state at a pressure of 0.3 to 3 MPa, preferably in the range of 10 to 180 seconds. The reason for this setting is that when the time is less than 10 seconds, the diffusion bonding with the molten metal metal is insufficient, or the effect of reducing the volume due to the pore compression is insufficient. On the other hand, if it exceeds 180 seconds, There are: the hard ceramic particles in the molten metal are reduced by melting or oxidation, so that the hardness or the incorporation of oxides cannot be increased. After the self-fluxing alloy powder is held in a molten state for a predetermined period of time and is acted upon by a pressure of 〇·3 〜 3 Μ P a , it is transferred to a cooling stage while maintaining the state, so that the molten solid alloy in the cylindrical body 1 is made. solidification. By the above method, it is possible to form an inner surface coating layer having few residual pores and high hardness. In the inner surface coating process of the manufacturing apparatus of the fifth drawing, the powder on the inner peripheral surface of the cylindrical body 1 is heated and melted, and a pressure of 〇3 to 3 MPa is applied to the inner surface thereof, and applied to the cylindrical body. The rotation speed at 1 is as described above in the -32-(27) 1259851, and the rotation speed at which the centrifugal force of 3 G or more is generated on the inner peripheral surface is determined. This is because, on the inner peripheral surface, at the rotational speed at which the centrifugal force of 3 G or more is generated, the inner peripheral surface of the cylindrical body 1 can equally distribute the powder in the circumferential direction, and at the same time, the powder can be prevented from moving in the circumferential direction and the axial direction after the distribution. The position is maintained, and the molten metal produced by heating and melting can maintain a certain thickness in the circumferential direction. In other words, when the centrifugal force acting on the inner circumferential surface of the cylindrical body 1 is at least 3 G, an inner coating layer having a uniform thickness can be formed. As described above, in order to form the inner surface coating layer having a uniform thickness, the cylindrical body 1 can be set at a rotational speed at which a centrifugal force of 3 G or more is applied to the inner peripheral surface, but the inner peripheral surface of the cylindrical body is set. The rotational speed at which the position generates a centrifugal force of 10 G or more is preferable. In this manner, when a centrifugal force of 10 G or more is applied to the molten metal layer on the inner peripheral surface of the cylindrical body 1, the compressive stress is uniformly generated in all the regions including the thickness direction in the molten metal layer, and the pressurized gas is pressurized. The fluctuation of the pressure-like behavior will be transformed into a relief-like state. During the period of 0.3~3 MPa pressure on the surface of the metal solution layer, it is possible to prevent the pressurized gas from penetrating through the pores in the molten metal layer or through the molten metal. The phenomenon of the interface between the liquid layer and the body of the cylinder occurs. This makes it possible to form an inner coating layer having almost no pinholes. Further, when centrifugal casting is performed in a state where the surface of the molten metal layer in the cylindrical body body is at a pressure of 〇3 to 3 MPa, the body of the same body may be previously placed in the circumferential position of the cylindrical body. Rotate at a rotational speed of ~50G centrifugal force. In this way, when the surface of the molten metal layer in the body of the cylinder is subjected to centrifugal casting under the action of a pressure of 0.3 to 3 MPa, the effect of the -35- (28) 1259851 molten metal layer on the centrifugal force of 20 to 50 G is obtained. In addition, not only the amount of pores remaining in the inner coating layer is extremely small, but also the hardness can be increased, and by applying a centrifugal force of 20 to 50 G, the hard microparticles can be centrifugally collected on the inner diameter side of the inner coating layer. The surface hardness can be increased, and thus it is possible to manufacture an inner coated cylinder having a higher hardness inner coating layer. In the above-described embodiment using the manufacturing apparatus of FIG. 5, when the internal self-fluxing alloy powder is melted by the heating of the body 1 in the other side, the inside of the cylinder body enters the air, but the present invention The inside of the cylindrical body is not limited to this configuration, and the pores in the coating layer may be minimized or may be performed in an oxidizing atmosphere to minimize oxidation of the self-fluxing alloy. Fig. 6 is a schematic view showing an example of a manufacturing apparatus which can perform a self-melting alloy powder heating and melting operation in a state where the cylindrical body is under a reduced pressure. The rotary joint 26 in the manufacturing apparatus is connected not only to the pressurizing means having the pressure regulating valve 31 and the compressor 32 by the piping 27, but also to the switching valve 28A and the vacuum pump 29A by the piping 27A. The other structure is the same as that of the manufacturing apparatus shown in Fig. 5. When the manufacturing apparatus shown in Fig. 6 is used, after the self-feeding alloy powder is supplied into the cylindrical body 1, 'the cover 15 and 15A are attached to both ends of the cylindrical body 1', and both ends of the cylindrical body 1 are closed, first started. When the inside of the cylindrical body 1 is in a reduced pressure state, the vacuum pump 29A rotates the tubular body 1 in the same manner as the above-described embodiment, and the inner circumferential surface position of the cylindrical body 1 is subjected to a centrifugal force of 3 G or more, and is performed in this state. The self-melting alloy powder is heated and melted. Further, after the molten layer is formed, the vacuum pump 29A is stopped, and the compressor 32 is started to cause the surface of the molten metal layer in the body of the cylinder to withstand the pressure of 0.3 to 3 MPa - 34 - (29) 1259851, and maintained in this state for a predetermined period of time. After that, it is cooled and solidified. In this way, it is possible to form an inner coating layer with less residual pores. In place of the vacuum pump 29A, the cylinder body 1 may be filled with an inert gas to form an atmosphere of no oxidizing gas. In this state, the self-melting alloy powder is heated and melted, so that the self-fluxing alloy can be realized. Minimization of oxidation. In each of the above-described embodiments, a linear induction coil (surface heating type coil) that inductively heats the cells in the circumferential direction of the cylindrical body 1 over the entire length of the cylindrical body can be used as the heating device 1 for heating the cylindrical body 1. 3. The heating device 13 of the induction coil having such a configuration can uniformly heat the entire length of the cylindrical body 1 in a short time, and since the cylindrical body 1 is rotated at a high speed, it is possible to uniformly heat the entire cylinder body 1 in a short time. The advantages. However, the heating device 13' that heats the entire length of the tubular body 1 is not limited to such a device, and may be appropriately changed. For example, it is also possible to use a body that is generally provided to surround the tubular body along the entire length while inductively heating the entire body of the cylinder. Inductive coils in the form of multiple coils. The following is an experiment for deriving the above experimental formula (A). (1) Experiment 1

As the cylindrical body 1, cylindrical body samples A, B, and C of the following shapes were prepared. Sample A: outer diameter 125 mm X inner diameter 44 mm X length 1250 mm Material: SCM410 Inner peripheral surface: sandblasting (internal circumferential surface roughness 20 μm Ra) -35- (30) 1259851 sample mB · outer diameter 125 mm χ Inner diameter 44 mm χ length 125 〇 mm material ·· SC Μ 4 1 0 Inner circumferential surface: sandblasting (internal circumferential surface roughness 5 μm Ra) f permanent product C. outer diameter 125 mm X inner diameter 44 mm x length 1250 Millimeter material: SC Μ 4 1 0 Inner circumferential surface: honing processing (internal circumferential surface roughness 0.5 μm R a) These samples A and B are respectively used in the apparatus shown in Fig. 1 and Fig. 2 under the following conditions. The inner peripheral surface of C was subjected to self-fluxing alloy coating. Self-fluxing alloy powder: Hogana sponge iron powder (Hoganas) #1355-20

Solidus temperature: 970 ° C Liquidus temperature: 1 0 7 0 ° C Powder loading: 2.5 kg of powder was placed in one place in the body 1 of the cylinder. Then, the body of the cylinder was rotated at a speed of 70 rpm so that the powder was uniformly dispersed in the body 1 of the cylinder in the axial direction. Acceleration of the barrel body: The barrel body 1 was accelerated from the stationary state to 350 rpm (the rotational speed at which 3G centrifugal force was generated) with the time shown in Table 1. After the rotation speed is reached, the rotation speed is maintained. Heating of the barrel body: The barrel body 1 is heated to 105 ° C. Thereby, the internal powder is heated to substantially the same temperature to make the powder partially melted. It is then held at this temperature for 30 seconds. Cooling of the barrel body: placement to cool. By the above operation, an inner cladding layer was formed on the inner peripheral surface of each sample cylinder body. The thickness of the inner cladding layer and the thickness deviation ratio in the axial direction were measured. The results are shown by the curves of Tables 1 and 7. -36- 1259851 (31) Thickness deviation rate (%) (N condensing νη cn 壊 coating thickness I (mm) (Ν cs CN (Ν to 3G acceleration time νη (Ν v〇<N CN inner surface processing Method Sandblasting sandblasting sandblasting sanding roughness (pmRa) d cylinder body sample << PQ OQ U test number test 1 test 2 test 3 test 4 test 5 -37- 1259851 (32) Table 1 and The graph of Fig. 7 shows that the shorter the acceleration time, the smaller the thickness deviation rate, and the smaller the roughness of the inner circumferential surface of the cylinder body, the smaller the thickness deviation rate. Therefore, it can be confirmed that the inner peripheral surface roughness can be increased to effectively prevent the coating. The layer was thicker in the axial direction. (2) Experiment 2 As the cylinder body 1, the cylindrical body samples D, ugly and F of the following shapes were prepared. Sample D: outer diameter 125 mm X inner diameter 27 mm X length 1250 mm Material: SCM410 Inner peripheral surface: Sandblasting, inner peripheral surface roughness 5 μm Ra Sample E: outer diameter 125 mm X inner diameter 35 mm X length 1250 mm Material: SCM410 Inner peripheral surface · Sandblasting, inner peripheral surface roughness 5 micron Ra sample F: outer diameter 125 mm X inner diameter 44 mm X length 1250 mm material·· Inner surface of SCM410: sandblasting, inner peripheral surface roughness 5 μm Ra Under the following conditions, the inner peripheral surfaces of these samples D, E and F were self-melted by the devices shown in Fig. 1 and Fig. 2, respectively. Alloy coating processing. Self-fluxing alloy powder: Hoganas sponge powder (Hoganas) #1355-2〇

Solidus temperature: 9 7 0 °C Liquidus temperature: 1 0 7 0 QC Loading of powder: The amount of powder shown in Table 2 was placed at one place in the body i of the cylinder. Then, the cylinder body i was rotated at a speed of 7 rpm for 2 sec seconds, and -38-(33) 1259851 was used to uniformly disperse the powder in the cylinder body 1 along the axial direction. Acceleration of the cylinder body: The cylinder body 1 was accelerated from the stationary state to the rotational speed shown in Table 2 (rotation speed at which 3 G centrifugal force was applied) with the time shown in Table 2. After the rotation speed is reached, the rotation speed is maintained. Heating of the barrel body: The barrel body 1 is heated to 1 〇 2 ° C. Thereby, the internal powder is heated to substantially the same temperature to make the powder into a partially molten state. It is then held at this temperature for 60 seconds. Cooling of the barrel body: placement to cool. With the above operation, an inner coating layer was formed on the inner peripheral surface of the same body of each sample. The thickness of the inner cladding layer and the thickness deviation ratio in the axial direction were measured. The results are shown by the curves of Table 2 and Figure 8. -39- (34)1259851 Thickness deviation rate (%) Destroy vn (N 壊yn 壊 coating thickness (mm) (N (N (N (N (Ν (N (Ν (rpm) (R) 390 390 390 350 350 1 350 to 3G acceleration time in 〇〇 (Ν powder supply (kg) rH ο (Ν 〇 〇(Ν νη (Ν tn (Ν (Ν barrel inner diameter i 1 (mm) ν〇 m in cn m Passenger cylinder body sample QQ ω (Jh test number test ό test 7 test 8 test 9 test 10 test 11 test 12 test 13 -40 _ (35) 1259851 The curves of Table 2 and Figure 8 illustrate the acceleration time The shorter the thickness deviation rate is, the smaller the thickness deviation rate increases as the inner diameter increases. In order to suppress the thickness deviation rate to a small number, the acceleration time must be shortened. Also, in the graph of Fig. 8, A curve 35 showing almost no thickness deviation is obtained, which is obtained by the following experimental formula (A): τ (sec) = 3x105 / D3 (A) (D is the inner diameter of the cylinder, mm) When the inner body surface roughness is 5 micrometers Ra or more, the body of the cylinder is coated with a self-fluxing alloy, and the powder is placed along the axis direction in the cylinder. After the body is uniformly disposed, if the cylinder body reaches the time required to generate a rotational speed of 3 G or more centrifugal force, and the number of times r is not exceeded by the time r obtained by the above experimental formula (A), the thickness can be formed along the tube. A coating layer having almost no deviation in the body axis direction. Examples [Examples 1 to 4] (1) A cylindrical body 1 and a self-fluxing alloy powder of the following shapes were prepared. The cylinder body: outer diameter 125 mm X inner diameter 44 Mm X Length 1250 mm Material: SC Μ 4 1 0 Inner circumference: Sandblasted, inner circumferential surface (roughness 20 μm Ra) Self-fluxing alloy powder: Hoganas sponge iron powder (Hoganas ) #1560

Solidus temperature: 980 ° C Liquidus temperature: 1200 ° C 1259851 (36) (2) Supply of powder and formation of powder layer The cylindrical body 1 is placed on the manufacturing apparatus shown in Fig. 1, where A portion of the inside of the cylinder body 1 was charged with 2.5 kg of powder. Then, both ends of the cylindrical body G were closed by a cover 15, and the cylindrical body 1 was rotated at a speed of 70 rpm for 20 seconds. Thereby, the powder is uniformly dispersed in the cylindrical body 1 along the axial direction.

Then, the rotation of the cylindrical body 1 is accelerated to the inner peripheral surface at 26 G (Example 1), 3 4 G (Example 2), 4 2 G (Example 3), and 50 G (Example 4) centrifugal force, respectively. The rotational speed under the action, after reaching the rotational speed, maintains the rotational speed. The acceleration at this time is set to an acceleration of the centrifugal force from 〇 to 3 G in 2 seconds. (3) Heating, melting and solidification of the powder The body 1 of the cylinder was heated to 1,050 °C. Thereby, the internal powder is also heated to substantially the same temperature to cause the powder to become partially molten. After the cylinder body 1 is heated to 105 (TC, it is kept at this temperature for 3 sec, then the heating is stopped and the cooling is performed. Thereby the molten metal layer on the inner surface of the cylindrical body 1 is solidified) so that the body is in the cylinder body The inner surface of the inner peripheral surface is formed with a coating layer. (4) The hardness of the inner surface coating layer is 2 mm, and the thickness of the inner surface coating layer is 0.5 mm. The hardness at the 〇mm position and the 1<5 mm position. The results are shown in Table 3. -42 - (37) 1259851 [Comparative Examples 1 to 3] The cylindrical body 1 having the same shape as that of Example 1 was used. The self-fluxing alloy powder was subjected to the centrifugal force of 4 G, 1 〇 G, and 18 G on the inner peripheral surface of the cylindrical body 1 when the powder layer was heated, and the inner surface was formed under the same conditions as in Example 1. The hardness of the obtained inner coating layer was measured in the same manner as in Examples 1 to 4. The results are also shown in Table 3. Table 3 Centrifugal hardness (Hv5) Hardness measurement position (depth from the surface mm) Average 0.5 1.0 1.5 Comparative Example 1 4 650 560 473 561 Comparative Example 2 10 781 560 480 607 Comparative Example 3 18 792 565 490 616 Example 1 26 818 584 502 629 Example 2 34 857 841 549 725 Example 3 42 874 857 6 13 769 Example 4 50 927 532 465 637 The results of Table 3 illustrate Examples 1 to 4 of centrifugal casting under increased centrifugal force Compared with the comparative example with low centrifugal force, the surface hardness of the inner surface coating layer was extremely high. Therefore, it was confirmed that the surface hardness of the inner surface coating layer can be improved by using the same self-fluxing alloy. The cross section of the inner cladding layer was cut and microscopically observed. As shown in Fig. 3, the surface layer 21a having a -43-(38) 1259851 two-layer structure formed a very large group of hard ceramic particles. It is considered that such a structure can greatly increase the hardness. [Examples 5 to 7] (1) The cylindrical body 1 and the self-fluxing alloy powder of the following shapes were prepared. The cylindrical body: outer diameter 125 mm X inner diameter 44 Mm X Length 1250 mm Material: SCM410 Inner circumference: Sandblasting (internal circumferential surface roughness 20 μm R a) Self-fluxing alloy powder: Hogana sponge iron powder (Η 〇ganas ) # 1 5 6 0

Solidus temperature: 980 ° C Liquidus temperature: 1 2 0 0 ° C (2) Supply of powder and formation of powder layer The cylinder body 1 is placed on the manufacturing apparatus shown in Fig. 5, in which the cylinder 2.5 kg of powder was placed in one body of the body 1. Then, both ends of the cylindrical body G were closed by the covers 15, 15 A, and the cylindrical body 1 was rotated at a speed of 70 rpm for 20 seconds. Thereby, the powder is uniformly dispersed in the cylindrical body 1 in the axial direction.

Then, the rotation of the cylindrical body 1 is accelerated until the rotational speed of the inner peripheral surface under the action of 10 G centrifugal force 'after reaching the rotational speed' maintains the rotational speed. The acceleration at this time is set to an acceleration of the centrifugal force from 〇 to 3 G in 2 seconds. (3) Heating, melting and solidification of the powder -44 - 1259851 (39) The cylinder body 1 is heated to 10 〇 °C. Thereby, the internal powder is also heated to substantially the same temperature to cause the powder to become partially molten. After heating the cylinder body 1 to 105 Ot, the compressor 3 2 is started, so that the inside of the cylinder body 1 is at MPa3 MPa (Example 5), 〇·6 Μ P a (Example 6), and 1.0 MPa ( Example 7) Under the action of air pressure, it was kept at this temperature for 15 seconds, then the heating was stopped and allowed to cool. In this way, the metal solution layer on the inner surface of the cylindrical body 1 is solidified, and an inner surface coating layer is formed on the inner peripheral surface of the cylindrical body. (4) Hardness measurement of the inner coating layer The inner coating layer was obtained to have a thickness of 2 mm. The hardness of the inner cladding layer at positions of 0.5 mm, 1.0 mm, and 1.5 mm was measured. The results are shown in Table 4. [Comparative Example 4]

Using the cylindrical body 1 and the self-fluxing alloy powder having the same shape as in Example 5, the inner coating layer was formed under the same conditions as in Example 5 except that 0 atmosphere was applied to the cylindrical body 1 when the powder layer was heated. . The hardness of the obtained inner facing layer was measured in the same manner as in Examples 5 to 7. The results are also shown in Table 4 〇-45 - (40) 1259851 Table 4 Pressure (MPa) Hardness (Hv5) Hardness measurement position (丨 度 度 mm from the surface) Average 0.5 1.0 i 1.5 Comparative Example 4 0 78 1 560 480 607 Example 5 0.3 792 652 600 681 Example 6 0.6 825 748 620 73 1 Example 7 1.0 841 766 680 762 The results of Table 4 illustrate that the molten metal layer in the barrel body 1 is at a pressure of 0.3 MPa or more. Examples 5 to 7 of centrifugal casting under action exerted an increase in surface hardness as compared with Comparative Example 4 in which no air pressure was applied. Therefore, it was confirmed that the same self-fluxing alloy can be used, and the surface hardness of the inner cladding layer can be improved by the present invention.

[Example 8J Using the cylindrical body 1 and the self-fluxing alloy powder of the same shape as in Example 2] This cylindrical body 1 was placed on the manufacturing apparatus shown in Fig. 5, and the body of the cylinder was removed while heating and melting the powder. The inner peripheral surface of 1 is outside the pressure of 1.0 MPa. The rest is formed under the same conditions as in the embodiment 2 (so that the inner peripheral surface of the cylindrical body 1 is under the action of centrifugal force of 34 G when heated and melted). Covered with a layer. The hardness of the obtained inner coating layer was measured in the same manner as in Example 2. The results are shown in Table 5 together with the results of Example 2. -46- 1259851 (41) Table 5 Air pressure (MPa) Hardness (Hv5) Hard β (depth from the table _ ^ measured position S mm) Average 0.5 1.0 1.5 Example 2 0 857 841 549 725 Example 8 1.0 900 912 796 869 The results of Table 5 show that Example 8 in which the inner circumferential surface position of the cylindrical body 1 was subjected to 34 G centrifugal force while being subjected to centrifugal casting under a pressure of 1.0 MPa was compared with Example 2 without air pressure. The inner coating has a higher hardness. Therefore, it was confirmed that the surface hardness of the inner cladding layer can be further improved by subjecting the molten metal layer to a high G centrifugal force while being subjected to a high gas pressure. The inner cladding layer formed in Example 8 was cut in a cross section and observed under a microscope. It was found that a three-layer structure as shown in Fig. 3 was also formed in this case, and the surface layer 21 a became a hard ceramic microparticle. More organizations. The chemical composition measurement results of the surface layer 2 1 a and the boundary layer 2 1 c are shown in Table 6. Further, the chemical composition of the self-fluxing alloy powder (Hog anas #1 5 60 ) before heat treatment is also listed in Table 6. Here, the concentration of the components in Table 6 is % by mass. -47 - (42) 1259851 Table 6 C Si _J Cr Fe Ni _^ surface layer 21a 0.39 6.03 28.32 7.45 59.81 Boundary layer 2 1 c 0.00 4.83 4.26 32.07 58.84 Powder 0.73 4.38 14.72 3.24 Balance Table 6 results, surface layer The concentration of chromium in 21a is increased, while the concentration of chromium in boundary layer 2 1 c is decreased. This is because the chromium compound-based hard ceramic fine particles which are precipitated in the molten metal are concentrated in the surface layer by centrifugal force during the centrifugal casting. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 (a) and (b) are schematic perspective views showing a state in which the inner cladding cylinder manufacturing apparatus according to the embodiment of the present invention is in a different operation state, Fig. 2(a), ( b), (c), and (d) are schematic cross-sectional views showing a process of forming a resin coating layer on the inner circumferential surface of the cylindrical body by the apparatus of Fig. 1. Figure 3 is a schematic cross-sectional view showing the cross-sectional structure of the inner cladding layer. Fig. 4 is a schematic perspective view showing an apparatus for manufacturing an inner cladding cylinder according to another embodiment of the present invention. Fig. 5 is a schematic perspective view showing the apparatus for manufacturing an inner facing cylindrical body according to another embodiment of the present invention. Fig. 6 is a schematic perspective view showing the above-described inner surface coated cylinder -48 - 1259851 (43) body manufacturing apparatus in still another embodiment of the present invention. Fig. 7 is a graph showing the relationship between the surface roughness and the acceleration time of the circumferential surface of the cylinder body obtained in Experiment 1, and the thickness deviation ratio in the axial direction of the coating layer. Fig. 8 is a graph showing the relationship between the inner diameter and the acceleration time of the cylinder body and the thickness deviation ratio in the axial direction of the coating layer obtained in Experiment 2. [Description of the figure] 1. Body body 2, self-fluxing alloy powder 3, cylinder supporting rotating device 4, receiving roller 5 > Pressurizing roller 6, variable speed motor 7, control device 9, powder supply device 10, powder supply tube 1 hopper trolley 13, heating device 15, 15 A: cover 20, inner cladding cylinder 21, inner cladding layer 25, connecting pipe 26, rotary joint -49 - 1259851 (44) 27, 28, 29 , 3 1, 32, Piping 28A: On-off valve vacuum pump pressure regulating valve compressor

Claims (1)

1259851 Pickup, Patent Application No. 92 1 0 8 1 5 No. 3 Patent Application for Mortgage | Chinese Patent Application Revision Republic of China May 5, 9 曰 repair 1 ^ Manufacturing method of inner cladding cylinder cylindrical inner circumferential surface The inner surface of the cylindrical body is coated on the inner circumferential surface to cover the inner surface of the cylinder: the hard ceramic is present in the casting by using the centrifugal casting at a speed of 20 to 20 at the inner circumferential surface position. The specific gravity of the microparticles is lower than that of the molten metal particles, and the molten metal is solidified under the inner diameter of the centrifugal casting system to solidify the molten metal to obtain the inner surface coating layer on the low specific gravity side. 2. The inner surface method of the first aspect of the patent application, wherein the specific gravity is lower than a chromium-based boride or a carbon microparticle of any one of the molten metal melted in the molten metal phase. 3. The inner surface method of claim 1, wherein the specific gravity is lower than a chromium-based boride precipitated from a molten metal phase of the molten metal phase, and any one of the carbonized ceramic particles; and the self-melting component The hard ceramic embossed with a specific gravity of 7 or less is introduced, and a method for manufacturing the inner-faced cylindrical body is formed on the inner circumferential surface of the cylindrical inner circumferential surface of the cylindrical body body. A method for producing a molten alloy, characterized in that the centrifugal force of '50G is rotated on the micro side of the molten metal phase in the melt of the self-fluxing alloy, and the microparticles in which the microparticles are collected in the inner diameter of the inner cylinder are used. The manufactured particles of the coated body and the borax carbide are S particles other than the basic components of the alloy from the self and the borocarbide. Is a manufacturing method including a surface coated cylinder having a center of f# from the valley of the 1259951, characterized by: applying a gas pressure of 0 · 3 to 3 Μ P a to the metal melting In the state of the surface of the liquid layer, the centrifugal force f# is made and the surface of the molten metal layer is subjected to the gas pressure, and the rotational speed of the tubular body is generated at the inner circumferential surface position. Rotation speed of centrifugal force above 0 G. 5. A method of manufacturing an inner-faced cylindrical body, comprising: coating a cylindrical inner surface of a process of centrifugally casting a self-fusing alloy for coating on an inner circumferential surface of a cylindrical inner circumferential cylindrical body; The manufacturing method is characterized in that: the centrifugal casting is performed while a gas pressure of 0.3 to 3 MPa is applied to the surface of the molten metal layer, and the surface of the molten metal layer is subjected to the air pressure, and the The rotation speed of the tubular body is such that a rotational speed of 20 to 50 G centrifugal force is generated at the position of the inner circumferential surface to make the specific gravity of the hard ceramic microparticles present in the molten metal in the casting lower than the molten metal phase of the molten metal. The fine particles are collected by reverse centrifugation on the inner diameter side of the centrifugal casting system, and the molten metal is solidified in this state to obtain the inner surface coating layer in which the low specific gravity fine particles are collected on the inner diameter side. 6. The method of manufacturing an inner coated cylinder according to any one of claims 1 to 5, wherein the temperature at which the self-fluxing alloy melt is obtained during the centrifugal casting is made: in the self-melting The solid-phase coexistence temperature range of the solid phase of the melting and solidification of the alloy to the liquidus is less than the temperature at the 70% position on the solidus side. 7. The method of manufacturing an inner cladding cylinder according to any one of claims 1 to 5, wherein in the centrifugal casting, the formation of the molten alloy layer on the inner circumferential surface is The introduction of the self-melting-2-1259851 alloy powder 'to the inside of the cylindrical body body' by heating and melting the powder under the rotation of the cylindrical body is performed. 8. The method for producing an inner coated cylinder according to any one of claims 1 to 5, wherein in the centrifugal casting, the formation of the self-fluxing alloy solution layer on the inner circumferential surface is as follows In the manner of the above description: (!) The self-fluxing alloy powder corresponding to the thickness of the coating layer is equally disposed in the tubular body direction in the horizontal direction of the cylindrical body; (2) by the cylindrical body Rotating around the axis to achieve a rotational speed of 3 G or more centrifugal force at the position of the inner circumferential surface of the cylindrical body, so that the powder in the cylindrical body is adhered in the circumferential direction of the cylindrical body. At the time of the time required to reach a rotational speed capable of generating a centrifugal force of 3 G or more, the inner peripheral surface of the cylindrical body does not exceed the time r obtained by the following experimental formula (A): τ (second) = 3x105/D3 · (A) (D is the inner diameter of the cylinder, mm) to prevent the powder uniformly disposed along the axial direction of the cylinder from moving in the axial direction of the cylinder to form the axial direction and the circumferential direction of the cylinder Powder layer with almost no thickness deviation So stuck on the peripheral surface of the cylindrical body; (3) continuing to the casing body in a state of rotation, so that the casing body is heated while warming the entire cylinder, the cylinder and the body of the powder is melted. 9. The method of manufacturing an inner cladding cylinder according to any one of claims 1 to 5, wherein in the centrifugal casting, the formation of the molten alloy layer on the inner circumferential surface is ' The self-fluxing alloy powder is introduced into the cylindrical body, and the powder is heated and melted by the body of the cylinder, and the powder is melted under reduced pressure. 1 〇 an inner-coated cylinder which is formed by centrifugal casting on the inner circumferential surface of a cylindrical body having a cylindrical inner circumferential surface, and an inner surface coating layer of a self-fusing alloy inner coating layer is formed. The body is characterized in that: on the inner diameter side of the inner surface coating layer, fine particles of a chromium compound-based hard ceramic are distributed at a high density, and the chromium component concentration is 20 to 40% by mass to improve the hardness. Floor. 1 1. The inner covering cylinder of claim 10, wherein the microscopic area ratio of the non-metallic medium is less than 0.1% on the outer diameter side in the inner cladding layer. Clean layer. 12. A manufacturing apparatus for an inner-faced cylindrical body, comprising: a cylindrical body supporting rotating device that horizontally supports and rotates a cylindrical body; and a cylindrical body supported by the cylindrical supporting rotating device a powder supply device for supplying a self-fluxing alloy powder having a thickness corresponding to a thickness of the coating layer in the body; and a heating device for heating the entire length of the cylindrical body of the rotating device supported by the cylindrical body, the cylindrical body supporting rotation The apparatus rotates the cylinder body at a rotational speed at which a centrifugal force of 20 to 50 G is generated at a circumferential position of the cylindrical body. 13. A manufacturing apparatus for an inner cladding cylinder, comprising: a cylinder supporting rotation device that horizontally supports and rotates the cylinder body; and a cylinder body supported by the cylinder supporting rotation device a powder supply device for supplying self-fluxing alloy powder in an amount corresponding to a thickness of the coating layer; a heating device for heating the entire length of the cylinder body supported by the cylindrical body supporting the rotating device by -4 - 1259851 degrees; And a pressing device for applying a pressure of 3 to 3 Μ P a to the inner surface of the cylindrical body, wherein the cylindrical supporting rotating device generates a centrifugal force of a centrifugal force of 10 G or more at a position of a circumferential surface of the cylindrical body To rotate the aforementioned cylinder body. A manufacturing apparatus for an inner-faced cylindrical body, comprising: a cylindrical body supporting rotating device that horizontally supports and rotates the cylindrical body; and a cylindrical body supported by the cylindrical supporting rotating device a powder supply device for supplying a self-fluxing alloy powder having a thickness corresponding to a thickness of the coating layer in the body; a heating device for heating the entire length of the cylindrical body supported by the cylindrical body supporting the rotating device; and making 0.3 to 3 The MPa air pressure acts on the inner surface of the cylindrical body, and the cylindrical support rotating device rotates the cylindrical body at a rotational speed of 20 to 50 G centrifugal force at a position on the circumferential surface of the cylindrical body. The apparatus for manufacturing an inner-faced cylinder according to any one of claims 1 to 4, wherein the heating device has a support for rotating the cylinder over the entire length of the cylinder An inductor for inductive heating between cells in the circumferential direction of the body of the cylinder supported by the device.