WO2013161176A1 - 穿孔圧延用プラグの製造方法 - Google Patents
穿孔圧延用プラグの製造方法 Download PDFInfo
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- WO2013161176A1 WO2013161176A1 PCT/JP2013/001858 JP2013001858W WO2013161176A1 WO 2013161176 A1 WO2013161176 A1 WO 2013161176A1 JP 2013001858 W JP2013001858 W JP 2013001858W WO 2013161176 A1 WO2013161176 A1 WO 2013161176A1
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- WIPO (PCT)
- Prior art keywords
- plug
- base material
- arc spraying
- arc
- coating
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 34
- 238000005507 spraying Methods 0.000 claims abstract description 108
- 239000000463 material Substances 0.000 claims abstract description 82
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000005096 rolling process Methods 0.000 claims abstract description 26
- 239000012768 molten material Substances 0.000 claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 13
- 229910052742 iron Inorganic materials 0.000 claims abstract description 13
- 239000010959 steel Substances 0.000 claims abstract description 13
- 238000007664 blowing Methods 0.000 claims abstract description 4
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 210000000746 body region Anatomy 0.000 claims 1
- 239000011248 coating agent Substances 0.000 abstract description 50
- 238000000576 coating method Methods 0.000 abstract description 50
- 239000010953 base metal Substances 0.000 description 32
- 239000007921 spray Substances 0.000 description 32
- 238000010586 diagram Methods 0.000 description 16
- 238000013142 basic testing Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 10
- 238000007796 conventional method Methods 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000005553 drilling Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000005422 blasting Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 238000007751 thermal spraying Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000011835 investigation Methods 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229910001315 Tool steel Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000000573 anti-seizure effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/131—Wire arc spraying
Definitions
- the present invention relates to a method for producing a piercing and rolling plug (hereinafter also simply referred to as “plug”) used in a piercing and rolling machine (hereinafter also simply referred to as “piercing machine”) used for the production of seamless steel pipes. More particularly, the present invention relates to a method for manufacturing a piercing-rolling plug in which a coating is formed by arc spraying an iron wire on the surface of a plug base material.
- the seamless steel pipe can be manufactured by the Mannesmann pipe manufacturing method.
- This pipe making process consists of the following steps: (1) A material (round billet) heated to a predetermined temperature is pierced and rolled by a piercing machine, and formed into a hollow shell (hollow shell); (2) The hollow shell is stretch-rolled by a stretching mill (eg, mandrel mill); (3) Using a constant diameter rolling mill (eg, stretch reducer), the stretched hollow shell is constant-rolled to a predetermined outer diameter and thickness.
- a stretching mill eg, mandrel mill
- a constant diameter rolling mill eg, stretch reducer
- a plug In piercing and rolling with a piercing machine, a plug is used as a piercing tool. This plug is attached to the end of the core metal and pierces the billet heated to a high temperature of about 1200 ° C., so that it is exposed to a severe situation where high surface pressure is applied with high heat.
- a plug uses hot tool steel as a base material, and in order to protect the base material, an oxide scale film is previously formed on the surface of the base material by heat treatment, and then used for piercing and rolling.
- the scale film on the plug surface plays a role of blocking heat transfer from the billet to the plug base material and preventing seizure between the billet and the plug.
- Such a plug with a scale coating is gradually worn with repeated piercing and rolling.
- the heat shielding effect by the coating is reduced, so that the temperature of the plug rises during drilling, and the plug base material is easily melted and thermally deformed.
- seizure occurs and wrinkles are generated on the inner surface of the steel pipe. For this reason, the plug becomes unusable at the time when the film is lost, and the life is reached.
- Patent Document 1 As a film to be formed on the surface of the plug base material, instead of a scale film by heat treatment, an iron wire material is arc sprayed on the surface of the plug base material to form oxide and Fe A plug formed with a film composed of is disclosed.
- This plug with an arc sprayed coating is expected to improve the plug life because the coating on the plug surface is composed of oxide and Fe, and is excellent in heat shielding properties and anti-seizure properties.
- a manufacturing facility in which a molten material is sprayed on the surface of a base material to form a film composed of oxide and Fe on the surface of the base material of the plug.
- a thermal sprayer is installed at the tip of the plug base metal surface, the front half of the barrel, and the latter half of the barrel, and all sprayers are operated simultaneously to form an arc spray coating.
- the time required for forming the coating can be shortened and the manufacturing efficiency of the plug can be improved as compared with the case where the arc spray coating is formed over the entire surface of the plug base material with one thermal spraying machine.
- the present invention has been made in view of the above problems, and presupposes that a coating composed of oxide and Fe is formed by arc spraying an iron wire on the surface of a plug base material. It is to provide a method for manufacturing a piercing and rolling plug having the following characteristics: (1) Strengthening the adhesion of the film formed on the plug surface; (2) The plug life can be stably improved even when the perforation length of the billet is long or the high temperature strength of the billet is high.
- the gist of the present invention is as follows.
- a method of manufacturing a plug used in a piercing and rolling machine used for manufacturing a seamless steel pipe The manufacturing method of the piercing and rolling plug is as follows: Including an arc spraying step of melting an iron wire by an arc spraying machine and blowing the molten material toward the surface of the plug base material to form a film composed of oxide and Fe on the surface of the base material of the plug; In this arc spraying process, the plug base material surface is divided into a plurality of regions in the axial direction of the plug, and the crossing angle between the arc sprayer blow center line and the plug base material surface is determined in each region. Arc spraying while maintaining in the range of 35 ° to 90 °, A manufacturing method of a plug for piercing and rolling characterized by the above.
- the plug has a shell shape and includes a body portion and a tip portion, and the plurality of regions are a body portion region and a tip portion region.
- the method for manufacturing a plug for piercing and rolling of the present invention has the following remarkable effects: (1) The adhesion of the arc sprayed coating formed on the plug surface can be strengthened; (2) The plug life can be stably improved even when the perforation length of the billet is long or the high temperature strength of the billet is high.
- FIG. 1 is a diagram schematically showing the state of arc spraying performed in a basic test for investigating the adhesion of an arc sprayed coating.
- FIG. 2 is a diagram showing the dependence of the angle of intersection between the blowing center line of the arc sprayer and the surface of the base metal of the plug as a basic test result of the investigation of the adhesion of the arc sprayed coating.
- FIG. 3 is a diagram showing a cross-sectional micro-observation photograph of the coating according to the crossing angle between the blowing center line of the arc spraying machine and the surface of the base metal of the plug as a basic test result of the investigation of the adhesion of the arc spraying coating.
- FIG. 1 is a diagram schematically showing the state of arc spraying performed in a basic test for investigating the adhesion of an arc sprayed coating.
- FIG. 2 is a diagram showing the dependence of the angle of intersection between the blowing center line of the arc sprayer and the surface of the base metal of the plug as
- FIG. 4 is a schematic diagram for explaining a conventional film forming method by arc spraying and arc spraying conditions of Comparative Example 4.
- FIG. 5 is a schematic diagram for explaining the reason why the plug life cannot be improved when the arc sprayed coating is formed by the conventional method shown in FIG.
- FIG. 6 is a schematic diagram showing a procedure of film formation by arc spraying in the plug manufacturing method of the first embodiment of the present invention.
- FIG. 7 is a schematic diagram showing a procedure of film formation by arc spraying in the plug manufacturing method of the second embodiment of the present invention.
- FIG. 8 is a schematic view for explaining the arc spraying construction conditions of Comparative Example 1.
- FIG. 9 is a schematic diagram for explaining the arc spraying conditions of Comparative Example 2.
- FIG. 10 is a schematic diagram for explaining the arc spraying conditions of Comparative Example 3.
- FIG. 11 is a schematic view for explaining the arc spraying construction conditions of Example 1 of the present invention.
- FIG. 12 is a schematic view for explaining the arc spraying conditions of Example 2 of the present invention.
- FIG. 13 is a schematic diagram for explaining the arc spraying construction conditions of Example 3 of the present invention.
- the present inventors are premised on forming a coating composed of Fe oxide and Fe by arc spraying an iron wire on the surface of the plug base material, and in particular, the arc spray coating of the arc spray coating.
- Various tests were conducted focusing on adhesion, and earnest studies were repeated. As a result, the following knowledge was obtained.
- Arc spraying uses an arc spraying machine. For example, an arc is generated between the tips of two sprayed wires that serve as electrodes to melt the sprayed wire, and at the same time, compressed air, nitrogen gas, etc. are placed between the tips of the sprayed wires.
- This is a technique for forming a film by supplying a jet to blow out a molten material and thereby spraying the molten material onto an object.
- the coating formed on the surface of the plug base material is composed of Fe oxide (iron oxide) and Fe.
- the Fe oxide in the coating is generated by oxidation during the flight until the molten material (molten iron) blown out from the arc sprayer reaches the plug base material surface.
- Fe in the film is the molten material that has reached the surface of the plug base material without being oxidized during the flight.
- FIG. 1 is a diagram schematically showing the state of arc spraying performed in a basic test for investigating the adhesion of an arc sprayed coating.
- the basic tests to investigate the adhesion of the film while rotating the plug base material 2 to the central axis P C around the plug 1, the molten material to the iron wire material sourced from an arc spray gun 4 A film was formed on the surface of the blowout plug 1. At that time, it was formed film crossing angle ⁇ between the balloon centerline A C and the plug 1 base material 2 of the surface of the arc spray gun 4 with various modifications.
- a peeling stress (hereinafter referred to as “adhesion force”) in the shear direction of the film was measured as an evaluation index of film adhesion.
- the evaluation of the adhesion of the film is based on the ratio of the adhesion force when the crossing angle ⁇ is 90 ° as a reference “1”, and the ratio of the adhesion strength at each crossing angle ⁇ (hereinafter referred to as “adhesion strength ratio”). went. Moreover, cross-sectional micro observation of the film was also conducted.
- FIG. 2 is a diagram showing the dependency of the angle of intersection between the blowing center line of the arc spraying machine and the surface of the base metal of the plug as a basic test result of the investigation of the adhesion of the arc sprayed coating.
- FIG. 3 is a diagram showing a cross-sectional micro-observation photograph of the coating film according to the crossing angle between the blowing center line of the arc sprayer and the surface of the base metal of the plug as the basic test result.
- the adhesion strength ratio of the coating depends on the intersection angle ⁇ between the blowing center line of the arc sprayer and the surface of the plug base material. Specifically, when the crossing angle ⁇ is a low angle of less than 35 °, the tendency of the adhesion force ratio to be remarkably lowered is recognized. On the other hand, if the crossing angle ⁇ is a high angle of 60 ° or more, there is no tendency for the adhesion ratio to decrease.
- the reason why the adhesion force decreases when the crossing angle ⁇ is low is that when the crossing angle ⁇ is low, the film adheres sparsely to the surface of the plug base material. This is thought to be due to the increase in porosity.
- arc spraying is used for repairing a tapping hole of a metal smelting vessel composed of a refractory and for coating an inner peripheral surface of a cylinder bore of an engine.
- the object to be subjected to arc spraying is the inner surface of the cylindrical member, and the spraying machine is inserted into the fixed cylindrical member to perform the arc spraying. Therefore, the distance from the spraying machine to the coating target surface, that is, the thermal spraying.
- the distance is as small as about 50 mm and at most about 150 mm. In such arc spraying that is generally performed, it is not desirable to set the intersecting angle between the spray center line of the thermal sprayer and the coating target surface to a high angle.
- the crossing angle When the crossing angle is high, the molten material blown out from the sprayer is reflected on the surface to be coated and returned to the sprayer, causing damage to the sprayer or the molten material reflected on the surface to be coated blown out again. This is to prevent the film from being inadvertently attached to the surface of the film and thereby reducing the adhesion of the film.
- the time for the molten material (molten iron) blown from the sprayer to oxidize during flight is reduced. Since it is necessary to ensure enough, the spraying distance from the sprayer to the plug base material surface is as large as about 200 to 1000 mm. For this reason, even if the crossing angle is high, the molten material hardly reflects on the plug base material surface.
- arc spraying is performed while the plug is rotated.
- the molten material does not inadvertently adhere to the surface of the plug base material.
- arc spraying is performed when forming the arc spray coating on the base material surface of the plug. It can be said that it is preferable to perform the arc spraying in a state where the crossing angle ⁇ between the blowing center line of the machine and the surface of the plug base material is maintained in the range of 35 ° to 90 °. More preferably, it is in the range of 60 ° to 90 °.
- FIG. 4 is a schematic diagram for explaining a conventional film forming method by arc spraying.
- the plug 1 is a shell-shaped, when forming the film 3 by an arc spraying on the surface of the base material 2, the central axis P C of the plug 1 to the plug base metal 2 While being rotated around, the thermal sprayer 4 is reciprocated along the surface of the plug base material 2 from the rear end to the front end.
- the coating 3 is formed on the surface of the plug 1 over the entire region of the front end portion 1a, the front half portion 1ba of the barrel portion 1b, and the latter half portion (reeling portion) 1bb of the barrel portion 1b.
- the thermal sprayer 4 is attached to an articulated arm that operates according to a program, and its movement and posture are controlled.
- FIG. 5 is a schematic diagram for explaining the reason why the plug life cannot be improved when the arc sprayed coating is formed by the conventional method shown in FIG.
- the thermal sprayer 4 since the thermal sprayer 4 is moved over a wide range from the rear end to the front end of the surface of the plug base material 2, the movement of the thermal sprayer 4 and the control of the posture are extremely complicated. Therefore, as shown in FIG. 5, the position adjustment and posture adjustment of the spray gun 4 is deviated even slightly relative to the plug base material 2, the balloon centerline A C and the plug base metal 2 of the surface of the spray gun 4
- the crossing angle ⁇ may deviate from the above-mentioned appropriate range (portion surrounded by a circle in FIG. 5). Due to this, a part of the film has low adhesion.
- Patent Document 1 in order to shorten the formation time of the film by arc spraying, a thermal sprayer is installed toward each of the tip of the plug, the front half of the body, and the latter half of the body, A technique for forming an arc sprayed coating by operating all the thermal sprayers simultaneously is described. Even in the case of this technique, the reason is not clear, but as with the conventional method shown in FIG. 4, the plug life cannot be improved as expected.
- FIG. 6 is a schematic view showing a procedure for forming a film by arc spraying in the method for manufacturing a plug according to the first embodiment of the present invention.
- FIG. 6 (a) shows the plug body as procedure 1 and
- FIG. b) shows a state in which a film is formed on the tip of the plug as step 2.
- the method of the first embodiment shown in the figure is based on the conventional method shown in FIG.
- the plug 1 is a shell-shaped, while rotating the plug base material 2 placed on the like turntable (not shown) to the central axis P C around the plug 1
- the coating 3 is formed on the surface of the plug base material 2 by arc spraying.
- the surface of the plug base material 2 is divided into two regions in the axial direction of the plug 1.
- drum 1b is shown.
- the body portion 1b is a portion of 80 to 98% of the total length along the axial direction (vertical direction in the drawing) from the rear end (lower end in the drawing) of the plug 1.
- the thermal sprayer 4 is opposed to the region of the plug body 1b on the surface of the plug base material 2, and reciprocating along only that region. And arc spraying. As a result, a film 3 is formed on the surface of the plug base material 2 on the body portion 1b excluding the tip portion 1a.
- step 2 the procedure proceeds to step 2 and, as shown in FIG. 6 (b), the thermal sprayer 4 is made to face the region of the plug tip 1a on the surface of the plug base material 2 and slightly along only that region. Reciprocate to arc spray. As a result, the film 3 is formed on the tip portion 1 a on the surface of the plug base material 2. In this way, the film 3 is formed over the entire surface of the plug 1.
- FIG. 6 (a), the any of the steps 1 and 2 (b), the intersection angle between the balloon centerline A C and the plug base metal 2 of the surface of the spray gun 4 theta is, the above basic test results Arc spraying is performed by controlling the movement and posture of each thermal sprayer 4 so as to be within the appropriate range derived from the above, that is, the range of 35 ° to 90 °, more preferably the range of 60 ° to 90 °.
- the surface of the plug base material 2 is divided into two regions (the tip portion 1a and the body portion 1b) in the axial direction of the plug 1, and the thermal sprayer is sequentially applied to each of the divided two regions.
- 4 with balloon centerline a C and the plug base metal 2 of the surface crossing angle ⁇ of maintaining the proper range performs arc thermal spraying, since in order to form a film 3, the adhesiveness of the plug base metal and the film Can be manufactured, and a plug with an arc sprayed coating that can significantly improve the plug life can be manufactured.
- each thermal sprayer 4 when arc spraying is performed in each divided area, the operating range of each thermal sprayer 4 can be reduced, so that the above-described intersection angle ⁇ can be ensured without complicated control of the movement and posture of each thermal sprayer 4. As a result, the adhesion of the film is stabilized over the entire surface of the plug, and the plug life is also stabilized.
- FIG. 7 is a schematic diagram showing the procedure of coating formation by arc spraying in the plug manufacturing method of the second embodiment of the present invention.
- FIG. FIG. 4B shows a state in which a film is formed on the front half of the plug body as step 2 and FIG.
- the method of the second embodiment is based on the method of the first embodiment, and the number of regions dividing the surface of the plug base material 2 is increased.
- the surface of the plug base material 2 is divided into three regions.
- FIG. 7 the example divided into the front-end
- the thermal sprayer 4 is made to face the region of the rear half 1bb of the plug body 1b on the surface of the plug base material 2, and arc spraying is performed. Apply. Thereby, on the surface of the plug base material 2, the film 3 is formed on the body rear half 1bb except for the tip 1a and the body front half 1ba.
- step 2 the procedure proceeds to step 2, and as shown in FIG. 7B, the thermal sprayer 4 is made to face the region of the front half 1ba of the plug body 1b on the surface of the plug base material 2, and arc spraying is performed. .
- the film 3 is formed on the body front half 1ba on the surface of the plug base material 2.
- step 3 the procedure proceeds to step 3, and as shown in FIG. 7C, the thermal sprayer 4 is made to face the region of the plug tip 1a on the surface of the plug base material 2, and arc spraying is performed. As a result, the film 3 is formed on the tip portion 1 a on the surface of the plug base material 2. In this way, the film 3 is formed over the entire surface of the plug 1.
- any of the steps 1-3 shown in FIG. 7 (a) ⁇ (c) , the intersection angle between the balloon centerline A C and the plug base metal 2 of the surface of the spray gun 4 theta is, the above basic test results Arc spraying is performed by controlling the movement and posture of each thermal sprayer 4 so as to be within an appropriate range derived from.
- the number of regions for dividing the surface of the plug base material may be any number as long as it is two or more, and the regions to be divided are set according to the taper angle, curvature, etc. of the plug surface.
- the plug obtained by the method of each of the above embodiments is repeatedly used for piercing and rolling, and when it reaches the end of its life, an arc sprayed coating can be re-formed on the plug surface and regenerated by the same method.
- the molten material inadvertently adheres to the target area to be subjected to arc spraying at the time of arc spraying in another area before that, the molten material may adhere at an inappropriate crossing angle. This is because it is assumed that the adhesion of the film may be non-uniform.
- a shielding plate when arc spraying is performed on each area of the surface of the divided base material, a shielding plate can be disposed so as to cover an area other than the target area for film formation.
- a shielding plate when arc spraying is applied to the body portion, a shielding plate is provided so as to cover the tip portion, and when performing arc spraying on the tip portion, the body portion is What is necessary is just to arrange
- a shielding plate when arc spraying is applied to the rear half of the body, a shielding plate may be disposed so as to cover the front half and the front end of the body.
- a shielding plate When spraying the front half of the body, a shielding plate is disposed so as to cover the rear half of the body and the front end, and when spraying the front end, the front half of the body and the rear half of the body are What is necessary is just to arrange
- the thickness of the coating by arc spraying can be formed uniformly over the entire region, or can be formed thicker at the tip than at the body.
- the plug tip where the surface pressure rises and the temperature rises during piercing and rolling can further ensure heat insulation and wear resistance due to the coating, and further improvement of the plug life can be expected. Useful in terms.
- a piercing and rolling plug was manufactured, and a test was conducted in which the manufactured plug was mounted on a piercing machine and pierced and rolled.
- the test conditions are as follows.
- an oxide scale film was formed on the surface of the plug base material using a heat treatment furnace to produce a plug with a scale film.
- the thickness of the scale film was 600 ⁇ m.
- Comparative Example 1 As shown in FIG. 8, balloon centerline A C of spray gun 4 while maintaining to always perpendicular to the central axis P C of the plug base material 2, a thermal spray gun 4 from the rear end surface of the plug base metal 2 Move across the entire area up to the tip and perform arc spraying. In this case, the crossing angle ⁇ between the balloon centerline A C and the plug base metal 2 of the surface of the spray gun 4, departing from the proper scope plug tip 1a.
- Comparative Example 3 As shown in FIG. 10 (a), as a step 1, while balloon centerline A C of spray gun 4 is maintained as is always parallel to the central axis P C of the plug base material 2, a thermal spray gun 4 plug body It is moved along only the region of the part 1b, and arc spraying is performed on the plug body 1b. Then, as shown in FIG. 10 (b), the process proceeds to Step 2, while crossing angle between the balloon centerline A C and the plug base metal 2 of the surface of the spray gun 4 theta is always kept to be a 25 ° Then, the thermal sprayer 4 is moved only along the region of the plug tip 1a, and arc spraying is performed on the plug tip 1a. In this case, the crossing angle ⁇ between the balloon centerline A C and the plug base metal 2 of the surface of the spray gun 4, departing from the proper scope across the plug tip portion 1a and the barrel section 1b.
- Comparative Example 4 Wherein as shown in Figure 4, balloon centerline A C of spray gun 4, the rear end of the plug base material 2 and perpendicular to the central axis P C of the plug base metal 2, the plug base metal at the tip of the plug base metal 2 while controlling the attitude of the spray gun 4 so as to be parallel to the second center axis P C, the spraying machine 4 is moved over the entire region from the rear end surface of the plug base material 2 to the tip, it performs arc spraying. In this case, the crossing angle ⁇ between the balloon centerline A C and the plug base metal 2 of the surface of the spray gun 4, departing from the proper scope in the vicinity of the boundary of the plug tip portion 1a and the body 1b.
- Invention Example 1 As shown in FIG. 11 (a), as Procedure 1, the spraying device 4 is moved along only in the region of the plug body portion 1b, at that time, the spray gun 4 balloon centerline A C and the plug base metal 2 The position of the thermal sprayer 4 is controlled so that the crossing angle ⁇ with the surface is 90 ° on the rear end side of the plug body 1b and exceeds 35 ° on the front end side of the plug body 1b. Perform arc spraying. Then, as shown in FIG.
- Invention Example 2 As shown in FIG. 12 (a), as a step 1, the spraying device 4 is moved along only in the region of the plug body portion 1b, at that time, the spray gun 4 balloon centerline A C and the plug base metal 2 The attitude of the thermal sprayer 4 is controlled so that the crossing angle ⁇ with the surface is always 90 °, and arc spraying is performed on the plug body 1b. Then, as shown in FIG. 12 (b), the process proceeds to Step 2, while maintaining as the intersection angle between the balloon centerline A C and the plug base metal 2 of the surface of the spray gun 4 theta is always 45 ° Then, the thermal sprayer 4 is moved only along the region of the plug tip 1a, and arc spraying is performed on the plug tip 1a. In this case, the crossing angle ⁇ between the balloon centerline A C and the plug base metal 2 of the surface of the spray gun 4, satisfying the appropriate range across the plug tip portion 1a and the barrel section 1b.
- Invention Example 3 As shown in FIG. 13 (a), as a step 1, the spraying device 4 is moved along only in the region of the plug body portion 1b, at that time, the spray gun 4 balloon centerline A C and the plug base metal 2 The attitude of the thermal sprayer 4 is controlled so that the crossing angle ⁇ with the surface is always 90 °, and arc spraying is performed on the plug body 1b. Then, as shown in FIG. 13 (b), the process proceeds to Step 2, while crossing angle between the balloon centerline A C and the plug base metal 2 of the surface of the spray gun 4 theta is always kept to be a 90 ° Then, the thermal sprayer 4 is moved only along the region of the plug tip 1a, and arc spraying is performed on the plug tip 1a. In this case, the crossing angle ⁇ between the balloon centerline A C and the plug base metal 2 of the surface of the spray gun 4, satisfying the appropriate range across the plug tip portion 1a and the barrel section 1b.
- Test results The test results are shown in Table 1.
- Example 1 to 3 of the present invention shown in 5 to 7 the base material surface of the plug is divided into a plurality of regions, and the appropriate range (35 °) of the crossing angle ⁇ defined in the present invention is sequentially and individually determined for each of the divided regions. Since the arc spraying was performed under the conditions satisfying (90 °), the adhesion of the coating was remarkably improved, the plug life ratio was 5.0 or more, and the improvement of the plug life was remarkably recognized.
- the present invention can be effectively used for the production of high alloy steel seamless steel pipes.
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Abstract
Description
(1)穿孔機により、所定温度に加熱された素材(丸ビレット)を穿孔圧延し、中空素管(ホローシェル)に成形する;
(2)延伸圧延機(例:マンドレルミル)により、中空素管を延伸圧延する;
(3)定径圧延機(例:ストレッチレデューサ)により、延伸圧延した中空素管を所定の外径と肉厚に定径圧延する。
(1)プラグ表面に形成された皮膜の密着性を強固なものにすること;
(2)ビレットの穿孔長が長い場合やビレットの高温強度が高い場合にも、安定してプラグ寿命を向上できること。
当該穿孔圧延用プラグの製造方法は、
アーク溶射機により鉄線材を溶融させその溶融材料をプラグの母材表面に向けて吹き出して、プラグの母材表面に酸化物およびFeで構成される皮膜を形成するアーク溶射工程を含み、
このアーク溶射工程では、プラグの母材表面をプラグの軸方向に複数の領域に区分し、区分した領域ごとに、順次、アーク溶射機の吹き出し中心線とプラグの母材表面との交差角度を35°~90°の範囲に維持した状態でアーク溶射を行うこと、
を特徴とする穿孔圧延用プラグの製造方法。
(1)プラグ表面に形成されたアーク溶射皮膜の密着性を強固なものにできること;
(2)ビレットの穿孔長が長い場合やビレットの高温強度が高い場合にも、安定してプラグ寿命を向上できること。
図6は、本発明の第1実施形態のプラグの製造方法において、アーク溶射による皮膜形成の手順を示す模式図であり、同図(a)は手順1としてプラグ胴部に、および同図(b)は手順2としてプラグ先端部にそれぞれ皮膜を形成する状態を示す。同図に示す第1実施形態の方法は、前記図4に示す従来の方法を基本とし、重複する説明は適宜省略する。
図7は、本発明の第2実施形態のプラグの製造方法において、アーク溶射による皮膜形成の手順を示す模式図であり、同図(a)は手順1としてプラグ胴部の後半部に、同図(b)は手順2としてプラグ胴部の前半部に、および同図(c)は手順3としてプラグ先端部にそれぞれ皮膜を形成する状態を示す。第2実施形態の方法は、上記第1実施形態の方法を基本とし、プラグ母材2の表面を区分する領域の数を増加させたものである。第2実施形態では、プラグ母材2の表面を3つの領域に区分する。図7では、プラグ1の先端部1aと、胴部1bの前半部1baと、胴部1bの後半部1bbとに区分した例を示している。
(1)プラグの製造
JIS規定の熱間工具鋼を母材とし、最大直径が57mmの砲弾形状のプラグを多数準備した。各プラグの母材表面に、鉄線材を用いたアーク溶射の施工条件を種々変更して皮膜を形成し、アーク溶射皮膜付きプラグを製造した。アーク溶射皮膜の形成に際しては、溶射機からプラグ母材表面までの溶射距離を最初は200mmとしてアーク溶射を行いつつ、逐次溶射機を遠ざけ、最後は溶射距離を1000mmまで広げてアーク溶射を行った。アーク溶射皮膜の厚みは、プラグ胴部で400μmとし、プラグ先端部で1200μmとした。
比較例1:
図8に示すように、溶射機4の吹き出し中心線ACがプラグ母材2の中心軸PCと常に直交するように維持しつつ、溶射機4をプラグ母材2の表面の後端から先端までの全域にわたって移動させ、アーク溶射を行う。この場合、溶射機4の吹き出し中心線ACとプラグ母材2の表面との交差角度θは、プラグ先端部1aで適正範囲を逸脱する。
図9に示すように、溶射機4の吹き出し中心線ACがプラグ母材2の中心軸PCと常に平行となるように維持しつつ、溶射機4をプラグ胴部1bの領域とプラグ先端部1aの領域の全域にわたって移動させ、アーク溶射を行う。この場合、溶射機4の吹き出し中心線ACとプラグ母材2の表面との交差角度θは、プラグ胴部1bで適正範囲を逸脱する。
図10(a)に示すように、手順1として、溶射機4の吹き出し中心線ACがプラグ母材2の中心軸PCと常に平行となるように維持しつつ、溶射機4をプラグ胴部1bの領域のみに沿って移動させ、プラグ胴部1bにアーク溶射を行う。次いで、図10(b)に示すように、手順2に移行し、溶射機4の吹き出し中心線ACとプラグ母材2の表面との交差角度θが常に25°となるように維持しつつ、溶射機4をプラグ先端部1aの領域のみに沿って移動させ、プラグ先端部1aにアーク溶射を行う。この場合、溶射機4の吹き出し中心線ACとプラグ母材2の表面との交差角度θは、プラグ先端部1aおよび胴部1bの全域で適正範囲を逸脱する。
前記図4に示すように、溶射機4の吹き出し中心線ACが、プラグ母材2の後端ではプラグ母材2の中心軸PCと直交し、プラグ母材2の先端ではプラグ母材2の中心軸PCと平行になるように溶射機4の姿勢を制御しつつ、溶射機4をプラグ母材2の表面の後端から先端までの全域にわたって移動させ、アーク溶射を行う。この場合、溶射機4の吹き出し中心線ACとプラグ母材2の表面との交差角度θは、プラグ先端部1aと胴部1bの境界付近で適正範囲を逸脱する。
図11(a)に示すように、手順1として、溶射機4をプラグ胴部1bの領域のみに沿って移動させ、その際に、溶射機4の吹き出し中心線ACとプラグ母材2の表面との交差角度θが、プラグ胴部1bの後端側では90°であり、プラグ胴部1bの先端側では35°を超えるように溶射機4の姿勢を制御し、プラグ胴部1bにアーク溶射を行う。次いで、図11(b)に示すように、手順2に移行し、溶射機4の吹き出し中心線ACとプラグ母材2の表面との交差角度θが常に90°となるように維持しつつ、溶射機4をプラグ先端部1aの領域のみに沿って移動させ、プラグ先端部1aにアーク溶射を行う。この場合、溶射機4の吹き出し中心線ACとプラグ母材2の表面との交差角度θは、プラグ先端部1aおよび胴部1bの全域で適正範囲を満たす。
図12(a)に示すように、手順1として、溶射機4をプラグ胴部1bの領域のみに沿って移動させ、その際に、溶射機4の吹き出し中心線ACとプラグ母材2の表面との交差角度θが常に90°となるように溶射機4の姿勢を制御し、プラグ胴部1bにアーク溶射を行う。次いで、図12(b)に示すように、手順2に移行し、溶射機4の吹き出し中心線ACとプラグ母材2の表面との交差角度θが常に45°となるように維持しつつ、溶射機4をプラグ先端部1aの領域のみに沿って移動させ、プラグ先端部1aにアーク溶射を行う。この場合、溶射機4の吹き出し中心線ACとプラグ母材2の表面との交差角度θは、プラグ先端部1aおよび胴部1bの全域で適正範囲を満たす。
図13(a)に示すように、手順1として、溶射機4をプラグ胴部1bの領域のみに沿って移動させ、その際に、溶射機4の吹き出し中心線ACとプラグ母材2の表面との交差角度θが常に90°となるように溶射機4の姿勢を制御し、プラグ胴部1bにアーク溶射を行う。次いで、図13(b)に示すように、手順2に移行し、溶射機4の吹き出し中心線ACとプラグ母材2の表面との交差角度θが常に90°となるように維持しつつ、溶射機4をプラグ先端部1aの領域のみに沿って移動させ、プラグ先端部1aにアーク溶射を行う。この場合、溶射機4の吹き出し中心線ACとプラグ母材2の表面との交差角度θは、プラグ先端部1aおよび胴部1bの全域で適正範囲を満たす。
上記の各プラグを使用して、1200℃に加熱した下記の被加工材(素材)を繰り返し穿孔圧延し、下記のホローシェルを作製した。
・被加工材の寸法 :直径70mm、長さ600mmの丸ビレット
・被加工材の材質 :SUS304
・ホローシェル :外径73mm、肉厚6.0mm、長さ1800mm
穿孔圧延を終えるたびにプラグの外観を検査し、皮膜が剥離してプラグが使用できなくなるか、またはプラグ先端部に溶損、焼き付きもしくは変形が発生したときのパス回数、すなわち連続して穿孔圧延することができたビレットの本数(連続穿孔回数)を調査した。プラグ寿命の評価は、スケール皮膜付きプラグの寿命を基準「1」とし、これに対する各プラグの寿命の比率(以下、「プラグ寿命比」という)で行った。
試験結果を表1に示す。
1ba:プラグ胴部の前半部、 1bb:プラグ胴部の後半部、
2:プラグ母材、 3:アーク溶射皮膜、 4:アーク溶射機
PC:プラグの中心軸、 AC:アーク溶射機の吹き出し中心線、
θ:交差角度
Claims (2)
- 継目無鋼管の製造に用いられる穿孔圧延機で使用されるプラグの製造方法であって、
当該穿孔圧延用プラグの製造方法は、
アーク溶射機により鉄線材を溶融させその溶融材料をプラグの母材表面に向けて吹き出して、プラグの母材表面に酸化物およびFeで構成される皮膜を形成するアーク溶射工程を含み、
このアーク溶射工程では、プラグの母材表面をプラグの軸方向に複数の領域に区分し、区分した領域ごとに、順次、アーク溶射機の吹き出し中心線とプラグの母材表面との交差角度を35°~90°の範囲に維持した状態でアーク溶射を行うこと、
を特徴とする穿孔圧延用プラグの製造方法。 - 前記プラグが砲弾形状で胴部および先端部からなり、前記複数の領域が胴部の領域と先端部の領域であること、
を特徴とする請求項1に記載の穿孔圧延用プラグの製造方法。
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US14/395,245 US20150132501A1 (en) | 2012-04-24 | 2013-03-19 | Method of producing plug for piercing-rolling |
RU2014146991/02A RU2593884C9 (ru) | 2012-04-24 | 2013-03-19 | Способ изготовления оправки для прошивки-прокатки |
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BR112017015320B1 (pt) * | 2015-02-09 | 2022-12-06 | Nippon Steel Corporation | Método de produção de plugue |
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JP2011001612A (ja) * | 2009-06-19 | 2011-01-06 | Komatsu Ltd | 溶射ガンの制御装置、制御方法および制御プログラム |
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CA2867101A1 (en) | 2013-10-31 |
EP2845655A1 (en) | 2015-03-11 |
CA2867101C (en) | 2017-05-16 |
JP5365723B2 (ja) | 2013-12-11 |
AR090817A1 (es) | 2014-12-10 |
BR112014023120B1 (pt) | 2021-09-28 |
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BR112014023120A2 (pt) | 2017-06-20 |
RU2593884C2 (ru) | 2016-08-10 |
RU2593884C9 (ru) | 2016-12-27 |
CN104284741A (zh) | 2015-01-14 |
EP2845655A4 (en) | 2016-02-24 |
US20150132501A1 (en) | 2015-05-14 |
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RU2014146991A (ru) | 2016-06-10 |
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