WO2017094863A1 - リング圧延体の製造方法 - Google Patents
リング圧延体の製造方法 Download PDFInfo
- Publication number
- WO2017094863A1 WO2017094863A1 PCT/JP2016/085824 JP2016085824W WO2017094863A1 WO 2017094863 A1 WO2017094863 A1 WO 2017094863A1 JP 2016085824 W JP2016085824 W JP 2016085824W WO 2017094863 A1 WO2017094863 A1 WO 2017094863A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ring
- ring material
- induction heating
- outer peripheral
- rolling
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/06—Making articles shaped as bodies of revolution rings of restricted axial length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/10—Lubricating, cooling or heating rolls externally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B5/00—Extending closed shapes of metal bands by rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/10—Lubricating, cooling or heating rolls externally
- B21B2027/103—Lubricating, cooling or heating rolls externally cooling externally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2267/00—Roll parameters
- B21B2267/02—Roll dimensions
- B21B2267/06—Roll diameter
- B21B2267/065—Top and bottom roll have different diameters; Asymmetrical rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2269/00—Roll bending or shifting
- B21B2269/12—Axial shifting the rolls
- B21B2269/16—Intermediate rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/10—Lubricating, cooling or heating rolls externally
- B21B27/106—Heating the rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/22—Making articles shaped as bodies of revolution characterised by use of rolls having circumferentially varying profile ; Die-rolling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2300/00—Application independent of particular apparatuses
- F16C2300/10—Application independent of particular apparatuses related to size
- F16C2300/14—Large applications, e.g. bearings having an inner diameter exceeding 500 mm
Definitions
- the present invention relates to a ring that forms a ring rolled body from a ring material by using rolling including a process of rolling the ring material between a mandrel roll and a main roll from both inner and outer peripheral sides while the ring material is rotated in the circumferential direction.
- the present invention relates to a method for manufacturing a rolled body.
- Ring-shaped parts are used for gears and rotating bodies of rotating mechanisms used in various industrial fields, and in many cases, ring parts are ring-shaped rolled. It is produced by processing a body (hereinafter referred to as “ring-rolled body”).
- the ring-rolled body is produced by subjecting a ring-shaped material (hereinafter referred to as “ring material”) to ring rolling, and a rolling device such as a ring rolling mill is used for the ring rolling.
- the inner and outer peripheral surfaces of the ring material are respectively reduced by a mandrel roll and a main roll, and one of the mandrel roll and the main roll is further reduced.
- the ring material is deformed so as to increase its diameter by relatively moving both in the ring radial direction with respect to the radial center of the ring material.
- the quality such as the dimensional accuracy of the produced ring rolled body may be lowered.
- a ring component that requires strict dimensional control such as a turbine disk used in a gas turbine, a steam turbine, an aircraft jet engine, or the like is produced. Therefore, the ring material is heated at the time of ring rolling.
- induction heating of the ring material by an induction heating coil or the like has become the mainstream.
- a mandrel roll and a main roll that respectively reduce the inner and outer peripheral surfaces of the ring material, and a pair of axial rolls that respectively reduce both end surfaces in the axial direction of the ring material.
- (Edge roll) and an induction heating coil (heating electrode) surrounding the entire circumference of the ring material are provided in the ring rolling mill, and the ring material is moved by the induction heating coil in the region immediately after the ring material passes the axial roll.
- induction heating coil heating electrode
- ring rolling is a mandrel roll and a main roll (inner and outer forming rolls) that respectively squeeze the inner and outer peripheral surfaces of the ring material (ring body), and the entire outer peripheral surface and both axial end surfaces of the ring material.
- An induction heating coil formed in a U-shape so as to be opposed is provided in a ring rolling mill (metal ring body forming device), and the induction heating coil is applied to the entire region along the ring material excluding the vicinity of the mandrel roll and the main roll.
- a ring rolling mill metal ring body forming device
- ring rolling mandrel rolls and main rolls (floating rolls and drive rolls) that respectively reduce the inner and outer peripheral surfaces of the ring material (ring body), and both end surfaces in the axial direction of the ring material are respectively reduced.
- a ring rolling mill rolling forging device
- inductively heats the ring material by an induction heating coil in a region immediately after the ring material passes the axial roll for example, see Patent Document 3
- the temperature of the outer peripheral side region of the ring material tends to be lower than the temperature of the inner peripheral side region.
- the entire circumference of the ring material is only induction-heated, so the temperature difference between the inner and outer circumferences of the ring material remains, and during the ring rolling, the radial direction of the ring material There is a possibility that the temperature distribution cannot be controlled within an appropriate temperature range.
- the final processing shape and processing rate of the ring material depend on the shape and size of the induction heating coil surrounding the entire cross-section of the ring material. There will be restrictions.
- the ring material when the ring material is squeezed between a pair of axial rolls from both sides in the axial direction, the effects of frictional heat generated between the axial roll and the ring material, heat transfer from the ring material to the axial roll, processing heat generation of the ring material, etc. This causes the temperature distribution of the ring material to become irregular. Therefore, it is difficult to control the temperature of the ring material immediately after the ring material passes through the axial roll.
- the temperature distribution of the ring material may not be controlled in an appropriate temperature range. .
- the rotating ring material may be held by a guide roll or the like in the vicinity of the main roll.
- heat transfer from the ring material to the guide roll is not as great as the influence of the axial roll.
- the temperature distribution of the ring material cannot be controlled within an appropriate temperature range due to the influence of the above.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to efficiently control the temperature distribution of the ring material in the ring rolling in an appropriate temperature range.
- An object of the present invention is to provide a method of manufacturing a ring rolled body that can efficiently improve the quality of the ring rolled body manufactured by using the ring rolled body.
- the ring material is in contact with the inner and outer peripheral surfaces of the ring material in a state where the ring material is rotated in the circumferential direction.
- a rolling apparatus comprising a rotatable mandrel roll and a main roll configured to reduce the material in its radial direction, and at least one induction heating body configured to induction-heat the ring material
- the center of the direction corresponding to the circumferential direction of the ring material is a reference line segment connecting the rotation axis of the ring material and the rotation axis of the main roll in the radial direction of the ring material, and the center of the ring material with respect to the reference line segment Arranged in a region immediately before the inner and outer peripheral pressure reduction sandwiched in the circumferential direction of the ring material by a boundary line rotated at an angle of 90 degrees or less in the direction opposite to the rotation direction of the ring material around the rotation axis Is done.
- the ring material is in contact with the inner and outer peripheral surfaces of the ring material in a state where the ring material is rotated in the circumferential direction, and the ring material is moved in the radial direction.
- a rotatable mandrel roll and main roll configured to be rolled down, and at least one induction heating coil having a winding wound to circulate and configured to inductively heat the ring material.
- the outer peripheral edge portion of the induction heating coil is arranged along the direction inclined with respect to the circumferential direction or the axial direction of the ring material. Having at least one ramp.
- the ring material is in contact with the inner and outer peripheral surfaces of the ring material in a state where the ring material is rotated in the circumferential direction, and the ring material is moved in the radial direction.
- a rotatable mandrel roll and main roll configured to be rolled down, and at least one induction heating coil having a winding wound to circulate and configured to inductively heat the ring material
- a mechanism configured to be able to change the inclination of the induction heating coil with respect to the circumferential direction or the axial direction of the ring material
- the outer peripheral edge portion of the induction heating coil is inclined with respect to the circumferential direction or the axial direction of the ring material.
- the temperature distribution of the ring material in the ring rolling can be efficiently controlled in an appropriate temperature range, and as a result, the ring rolled body produced using the ring rolling.
- the quality of can be increased efficiently.
- FIG. 1 It is a perspective view which shows typically the rolling apparatus used in 1st Embodiment of this invention. It is a top view which shows typically the rolling apparatus used in 1st Embodiment of this invention. It is a figure which shows typically the cross section which cut
- ring-rolled body A method for manufacturing a substantially ring-shaped rolled body (hereinafter referred to as “ring-rolled body”) according to the first to fifth embodiments of the present invention will be described below with reference to FIGS.
- the ring-rolled body is used for producing a substantially ring-shaped part (hereinafter referred to as “ring part”).
- ring part a substantially ring-shaped part
- such a ring component may be a gear used in various industrial fields, a rotating body of a rotating mechanism, etc., and further, the ring component requires a strict dimensional control, in particular, A turbine disk or the like used for a gas turbine, a steam turbine, an aircraft jet engine or the like is preferable.
- the diameter of the outer periphery of the ring rolled body is preferably about 600 mm or more and about 2000 mm or less.
- the present invention is not limited to this, and depending on the ring component produced using the ring rolled body, the ring rolled body The diameter of the outer periphery of can be smaller than about 600 mm and larger than about 2000 mm.
- the ring rolled body is formed by subjecting a substantially ring-shaped material (hereinafter referred to as “ring material”) to ring rolling.
- ring material is preferably manufactured using a metal material having excellent high-temperature strength, high-temperature toughness, etc.
- the ring material is a Ni-based alloy, Fe-based alloy, Co-based alloy, Ti, which is excellent in high-temperature strength, high-temperature toughness, etc. It may be manufactured using a metal material selected from a base alloy or the like.
- the rolling apparatus is configured to be capable of mounting a ring material 1 formed substantially rotationally symmetric with respect to an axis 1a.
- the rolling device is configured to contact the inner and outer peripheral surfaces 1b and 1c of the ring material 1 and to reduce the ring material 1 in the radial direction (hereinafter referred to as “ring radial direction”) and A pair configured to contact the main roll 3 and both end faces 1d and 1e of the ring material 1 in the direction of the axis 1a (hereinafter referred to as “ring axis direction”) and to reduce the ring material 1 in the ring axis direction.
- the axial rolls 4 and 5 are provided. However, the present invention is also applicable to a rolling device that does not include a pair of axial rolls 4 and 5.
- the rolling device also includes two guide rolls 6 and 7 configured to be able to contact the ring material 1.
- the rolling apparatus further includes one outer peripheral induction heating body 8 configured to directly heat the ring material 1.
- the mandrel roll 2 has a peripheral surface 2 a configured to be able to contact the inner peripheral surface 1 b of the ring material 1
- the main roll 3 has an outer peripheral surface 1 c of the ring material 1. It has the surrounding surface 3a comprised so that contact is possible.
- Such peripheral surfaces 2a and 3a are substantially rotationally symmetric with respect to the rotation axes 2b and 3b, respectively.
- Each of the mandrel roll 2 and the main roll 3 is configured to be rotatable about rotation axes 2b and 3b.
- One or both of the mandrel roll 2 and the main roll 3 are preferably configured to be rotationally driven by a drive mechanism (not shown).
- the mandrel roll 2 and the main roll 3 are also preferably configured so that their rotational speed can be controlled as required.
- the main roll 3 is configured to be rotatable.
- the “inner peripheral side of the ring material 1” is defined as a range including the inner peripheral side region of the ring material 1 having the surface of the ring material 1 in contact with the mandrel roll 2, and “the outer peripheral side of the ring material 1”. Includes the outer peripheral side region of the ring material 1 having the surface of the ring material 1 in contact with the main roll 3 and the pair of axial rolls 4, 5 and is closer to the outer periphery of the ring material 1 with respect to the inner peripheral side region of the ring material 1 Is defined as the range located at.
- the peripheral surfaces 2a and 3a of the mandrel roll 2 and the main roll 3 have a shape corresponding to the shape of the ring rolled body to be produced.
- the ring material 1 has one convex portion 1f that protrudes from the outer peripheral surface 1c and extends in the circumferential direction of the ring material 1 (hereinafter referred to as “ring circumferential direction”).
- the peripheral surface 3 a of the main roll 3 is formed so as to have one concave portion 3 c corresponding to the one convex portion 1 f and extending along the circumferential direction of the main roll 3. Has been.
- the outer peripheral surface of the ring material is not limited to this, and is formed to be substantially flat, to have a portion whose diameter is changed along the ring axial direction, or one or more It may be formed so as to have at least one of the convex portion and one or more concave portions, and the peripheral surface of the main roll may be formed corresponding to the outer peripheral surface of such a ring material.
- the inner peripheral surface of the ring material can also be formed in the same manner as the outer peripheral surface of such a ring material, and the peripheral surface of the mandrel roll can be formed corresponding to the inner peripheral surface of the ring material.
- the mandrel roll 2 and the main roll 3 are configured to be movable in the ring radial direction.
- the ring material 1 is squeezed between the peripheral surfaces 2 a and 3 a of the mandrel roll 2 and the main roll 3.
- the rolling device is configured such that the ring material 1 can rotate in the circumferential direction of the ring as the mandrel roll 2 and the main roll 3 rotate.
- the main roll 3 rotates to the one side (indicated by arrow R2) of the rotation direction, and the mandrel roll 2 is in one side (indicated by arrow R1) of the rotation direction.
- a description will be given of a case where the ring material 1 rotates toward one side (indicated by arrow F) in the ring circumferential direction as it rotates.
- the pair of axial rolls 4, 5 are arranged with a space in the ring circumferential direction with respect to the main roll 3.
- the pair of axial rolls 4, 5 can be arranged at an angle ⁇ interval about the axis 1 a of the ring material 1 with respect to the main roll 3.
- the angle ⁇ is preferably about 180 degrees.
- the pair of axial rolls 4 and 5 are spaced apart from the main roll 3 in the ring circumferential direction and face the ring radial direction. Preferably it is arranged.
- the angle ⁇ is not limited to this, and may be within a range larger than about 0 degree and smaller than about 360 degrees as long as a high-quality ring-rolled body can be produced. It may be within a range of less than or equal to about 135 degrees, or within a range of about 135 degrees or more and about 225 degrees or less.
- the pair of axial rolls 4 and 5 have peripheral surfaces 4a and 5a configured to be able to come into contact with both end surfaces 1d and 1e in the ring axis direction, respectively. Such peripheral surfaces 4a and 5a are substantially rotationally symmetric with respect to the rotation axes 4b and 5b, respectively.
- Each of the pair of axial rolls 4 and 5 is configured to be rotatable about the rotation axes 4b and 5b.
- One or both of the pair of axial rolls 4 and 5 are preferably configured to be rotationally driven by a drive mechanism.
- the pair of axial rolls 4 and 5 are also preferably configured so that the rotation speed can be controlled as necessary.
- the peripheral surfaces 4a and 5a of the pair of axial rolls 4 and 5 each have a shape corresponding to the shape of the ring rolled body to be produced.
- the ring material 1 is squeezed between the peripheral surfaces 4 a and 5 a of the pair of axial rolls 4 and 5.
- the rolling device is configured such that the ring material 1 can rotate in the circumferential direction of the ring as the pair of axial rolls 4 and 5 rotates.
- one side axial roll 4 rotates to the one side (indicated by arrow R3) of the rotation direction
- the other side axial roll 5 is one side of the rotation direction
- the guide roll 6 on one side of the two guide rolls 6 and 7 is directed from the pair of axial rolls 4 and 5 to one side (indicated by arrow F) in the ring circumferential direction. It is arranged in a range reaching the main roll 3.
- the other guide roll 7 is disposed in a range from the pair of axial rolls 4, 5 to the main roll 3 toward the other side in the ring circumferential direction.
- the two guide rolls 6 and 7 have peripheral surfaces 6a and 7a configured to be able to contact the outer peripheral surface 1c of the ring material 1, respectively. Such peripheral surfaces 6a and 7a are substantially rotationally symmetric with respect to the rotation axes 6b and 7b, respectively.
- Each of the two guide rolls 6 and 7 is configured to be rotatable about rotation axes 6b and 7b.
- the two guide rolls 6 and 7 are configured to hold the ring material 1 that rotates in the circumferential direction of the ring while contacting the outer peripheral surface 1c of the ring material 1 and rotating around the rotation axes 6b and 7b.
- the present invention is not limited to this, and the rolling apparatus may be configured not to include a guide roll.
- the rolling apparatus may be configured not to include a guide roll.
- a rolling device is the structure provided with a guide roll, it is good to provide at least the above-mentioned one side guide roll.
- the outer circumferential induction heating body 8 includes an induction heating coil 8a having a winding wound so as to circulate at least once, and the outer circumferential induction heating body 8 includes the induction heating coil 8a.
- a magnetic field for induction heating is generated by passing an alternating current through the winding of the coil 8a.
- the outer peripheral induction heating body 8 is also configured to be movable.
- a substantially center (hereinafter referred to as “outer peripheral induction heating body 8” in the direction corresponding to the circumferential direction of the outer peripheral side region of the ring material 1 in the outer peripheral induction heating body 8.
- the center of the ring material 1) is a ring centering on the axis 1 a of the ring material 1 with respect to a reference line segment L connecting the axis 1 a of the ring material 1 and the rotation axis 3 b of the main roll 3 in the radial direction of the ring material 1. It arrange
- the circumferential center of the outer induction heating body 8 may be located in a region immediately before the reduction by the mandrel roll 2 and the main roll 3 (hereinafter referred to as “region immediately before the inner and outer periphery reduction”).
- region immediately before the inner and outer circumferential pressure reduction is the reference line segment L and the boundary line segment rotated about the axis 1a of the ring material 1 with respect to the reference line segment L to the other side in the ring circumferential direction at an angle ⁇ .
- the angle ⁇ is not less than a size that allows the outer periphery side induction heating body 8 to be disposed in the region immediately before the inner and outer periphery pressure reduction and not more than about 90 degrees. Good. Further, the angle ⁇ is preferably 60 degrees or less, and more preferably 45 degrees or less. In particular, it is preferable that the entire outer peripheral induction heating body 8 can be arranged in the region immediately before the inner and outer peripheral pressure reduction. Such a region immediately before the inner and outer circumferential pressure reduction is located between the main roll 3 and the guide roll 6 on one side in the ring circumferential direction. It is preferable that the roll 3 and the guide roll 6 on one side are positioned.
- the interval in the ring circumferential direction between the main roll 3 and the outer circumferential induction heating body 8 is smaller than the interval in the ring circumferential direction between the pair of axial rolls 4, 5 and the outer circumferential induction heating body 8. It is preferable.
- the area immediately before the inner and outer peripheral pressures can be defined as follows. That is, the region immediately before the inner and outer peripheral pressures is the other side in the ring circumferential direction with respect to the main roll 3 and one side in the ring circumferential direction with respect to the center in the ring circumferential direction between the main roll 3 and the pair of axial rolls 4 and 5. Can be defined as Further, the region immediately before the inner and outer circumferential pressures is a range of a length obtained by dividing the length in the ring circumferential direction between the main roll 3 and the pair of axial rolls 4 and 5 from the main roll 3 toward the other side in the ring circumferential direction. Can be defined as being located within.
- the rolling apparatus may also include induction heating means other than the outer peripheral induction heating body 8.
- induction heating means other than the outer peripheral induction heating body 8.
- the induction heating means disposed on the other side of the ring circumferential direction and between the main roll 3 and the pair of axial rolls 4 and 5 is preferably only the outer peripheral induction heating body 8.
- only the outer periphery side induction heating body 8 may be sufficient as the induction heating means provided in a rolling mill.
- the induction heating coil 8 a is spaced from the outer peripheral surface 1 c of the ring material 1 in the ring radial direction, and the direction of the winding axis 8 b of the winding is set to the outer peripheral surface 1 c of the ring material 1. It is arranged to point to. Further, both end portions in the ring axis direction of the outer peripheral surface 1c of the ring material 1 are arranged within a range sandwiched between both end portions in the ring axis direction of the induction heating coil 8a.
- the induction heating coil 8 a By this induction heating coil 8 a, the outer peripheral surface 1 c of the ring material 1, particularly the surface of the ring material 1 in contact with the main roll 3 can be induction heated in the region immediately before the inner and outer peripheral pressure reduction. As a result, the induction heating coil 8a can further induction heat the outer peripheral side region of the ring material 1 immediately before the inner and outer peripheral pressure reduction, and the surface of the ring material 1 in contact with the pair of axial rolls 4 and 5 is also induction heated. it can.
- the rolling device may have a plurality of outer peripheral induction heating bodies in order to make temperature control of the ring material easier.
- the direction of the winding axis of the induction heating coil may be directed to other than the outer peripheral surface of the ring material, as long as the outer peripheral surface or the outer peripheral side region of the ring material can be induction-heated in the region immediately before the inner / outer peripheral pressure reduction.
- the outer peripheral induction heating body may have a magnetic core around which an induction heating coil is wound. In this case, the magnetic flux generated from the magnetic core The outer peripheral surface of the ring material on the line is induction-heated.
- the outer peripheral edge portion of the induction heating coil 8a is formed in a substantially rectangular shape when viewed from the direction of the winding shaft 8b.
- the outer peripheral edge portion of the induction heating coil is not limited to this, and can be formed in a substantially circular shape, a substantially elliptical shape, a substantially polygonal shape other than a substantially rectangular shape, etc. as viewed from the direction of the winding axis.
- the number of turns of the induction heating coil 8a is preferably plural in accordance with the required magnetic line density within a range in which the coil can be manufactured.
- the manufacturing method of a ring rolling body is demonstrated.
- the ring material 1 heated in advance is ring-rolled by the above-described rolling apparatus.
- the temperature of the ring material 1 to be heated in advance is preferably in the range of about 850 ° C. or higher and about 1150 ° C. or lower.
- the temperature is not limited to this, and can be adjusted according to the type of metal material used for the ring material so as to produce a high-quality ring rolled body.
- the mandrel roll 2 and the main roll 3 and the pair of axial rolls 4 and 5 rotate, and the ring material 1 heated in advance with these rotations, It rotates to one side (indicated by arrow F) in the ring circumferential direction around the axis 1a.
- the temperature of the ring material 1 that is induction-heated by the outer peripheral side induction heating body 8 is in the range of about 850 ° C. or more and about 1150 ° C. or less.
- the temperature is not limited to this, and may be adjusted so that the temperature distribution in the radial direction of the ring material can be efficiently controlled within an appropriate temperature range. It may be adjusted to make the temperature distribution uniform.
- the outer peripheral surface 1c or the outer peripheral side region of the ring material 1 is likely to have a temperature drop compared to the inner peripheral side region of the ring material 1 in the region immediately before the inner and outer peripheral pressure reduction. Since the ring material 1 is induction-heated, the ring material 1 immediately passes through the region immediately before the inner and outer circumferential pressure reduction, and the ring material 1 is pressed between the mandrel roll 2 and the main roll 3 (hereinafter referred to as the “inner and outer circumferential reduction region”).
- the temperature distribution in the radial direction of the material 1 can be efficiently controlled within an appropriate temperature range, and as a result, the quality such as the dimensional accuracy of the produced ring rolled body can be efficiently increased. Moreover, since it can suppress that the temperature distribution between the surface of the ring raw material 1 and the inside of the ring raw material 1 becomes non-uniform with the temperature fall of the ring raw material 1, the mixing of crystal grains is carried out in the whole ring rolling body produced. Can be suppressed. That is, it is possible to promote grain size adjustment in the entire ring rolled body to be produced.
- the induction heating coil 8a can further induction heat the outer peripheral side region of the ring material 1 in the region immediately before the inner and outer peripheral pressure reduction, and the surface of the ring material 1 in contact with the pair of axial rolls 4 and 5 can be Since induction heating is possible, it is possible to prevent the surface from being cracked and causing a reduction in dimensional accuracy.
- the distance in the ring circumferential direction between the main roll 3 and the outer circumferential induction heating body 8 is a pair of axial rolls 4 and 5 and the outer circumferential induction heating body 8. Is smaller than the interval in the circumferential direction of the ring. Therefore, when the surface of the ring material 1 is induction-heated by the outer peripheral induction heating body 8, friction heat generated between the ring material 1 and the pair of axial rolls 4, 5, and from the ring material 1 to the pair of axial rolls 4, 5. It is possible to make it less susceptible to the effects of heat transfer, processing heat generation of the ring material 1, and the like. As a result, the radial temperature distribution of the ring material 1 can be efficiently controlled within an appropriate temperature range.
- the outer peripheral induction heating body 8 is located between the main roll 3 and the one side guide roll 6. Therefore, even if the rolling device includes a guide roll that is generally disposed in the vicinity of the main roll, the ring material 1 does not pass through the guide roll immediately after induction heating by the outer peripheral side induction heating body 8. Then, it will be rolled down by the main roll 3. As a result, the radial temperature distribution of the ring material 1 can be efficiently controlled within an appropriate temperature range.
- the temperature of the outer peripheral surface 1c of the ring raw material 1 which contacts the peripheral surface 3a of the main roll 3 is shown. Is appropriately managed, and the entire outer peripheral surface 1c of the ring material 1 is directly induction-heated in the region immediately before the inner and outer circumferential pressure reduction.
- the temperature distribution in the radial direction can be efficiently controlled within an appropriate temperature range.
- the main processing of the ring material 1 is the reduction by the main roll 3, it is important to appropriately control the temperature of the outer peripheral surface 1c of the ring material 1 in contact with the main roll 3.
- the volume of the mold part of the main roll 3 configured to mold the ring material 1 is equal to the mold part of the mandrel roll 2 configured to mold the ring material 1. It tends to be larger than the volume.
- the main roll 3 is located on the outer peripheral side of the ring material 1, the peripheral length of the main roll 3 is larger than the peripheral length of the mandrel roll 2, and the surface area of the ring material 1 in contact with the main roll 3 is increased.
- the surface area of the ring material 1 in contact with the mandrel roll 2 tends to be larger.
- the amount of heat escaping from the surface of the ring material 1 in contact with the main roll 3 tends to be larger than the amount of heat escaping from the surface of the ring material 1 in contact with the mandrel roll 2.
- the entire outer peripheral surface 1c of the ring material 1 can be induction-heated by the induction heating coil 8a in the region immediately before the inner / outer peripheral pressure reduction, the surface of the ring material 1 in contact with the main roll 3 in this way is used. The amount of heat that escapes can be compensated.
- the outer peripheral side induction heating body 8 of the first embodiment is further configured as follows, and a method of manufacturing a ring rolled body using the outer peripheral side induction heating body 8 is as follows. It can be implemented as follows.
- the region immediately before the inner and outer circumferential pressure reduction related to the outer circumferential induction heating body 8 is located between the reference line segment L and the boundary line segment M in the ring circumferential direction,
- the guide roll 6 is disposed in the middle of the ring circumferential direction in the region immediately before the inner and outer circumferential pressure reduction.
- the diameter of the ring material 1 increases as the ring rolling proceeds from the start stage to the completion stage. Therefore, before the ring rolling start stage as shown in FIG. 14, and further before the ring rolling intermediate stage, the ring circumferential direction, preferably the tangential direction in contact with the outer circumference of the ring material 1 (hereinafter referred to as “ring tangent”). Direction)), a space (hereinafter referred to as a “heating body arrangement space”) located between the guide roll 6 and the boundary line segment M on the outer peripheral side and one side of the ring material 1 in the region immediately before the inner and outer peripheral pressure reduction.
- the length S1 is less than or equal to half the length T of the outer circumferential induction heating body 8.
- the relationship between the lengths S1 and S2 of the heating element arrangement space in the region immediately before the inner and outer pressure reduction and the length T of the outer induction heating element 8 is such that the outer diameter of the ring material 1 at the start of ring rolling is about 700 mm. It can be defined as resulting from: However, the present invention is not limited to this, and depending on conditions such as rolling equipment and ring rolling, of course, when the diameter of the outer periphery at the start stage of ring rolling is larger than about 700 mm, the relationship between the lengths is of course. Can be brought.
- the center of the outer circumferential induction heating body 8 is the outer circumferential side of the ring material 1 and the boundary line segment M in the ring circumferential direction.
- the distance in the ring radial direction between the ring material 1 and the outer circumferential induction heating body 8 is maintained so as to enable induction heating.
- the center of the outer peripheral induction heating body 8 is arranged in the region immediately before the inner and outer peripheral pressure reduction between the middle stage and the completion stage of ring rolling.
- the center of the outer peripheral induction heating body 8 is arranged in the ring circumferential direction, preferably in the ring tangential direction, in the area immediately before the inner and outer circumferential pressure reduction. It arrange
- the present invention is not limited to this, and the outer peripheral induction heating body may be as follows. Before the intermediate stage of the ring rolling, the outer peripheral side induction heating body has a ring diameter from the outer periphery of the ring material so as to avoid the one side guide roll and the reference line portion on the outer peripheral side of the ring material. In this case, the outer peripheral side induction heating body may be in a state where the ring material cannot be induction heated.
- the outer circumferential induction The heating body can be moved at an arbitrary timing of the ring rolling so that the center of the outer circumferential induction heating body is arranged in the region immediately before the inner and outer circumferential pressure reduction. Further, in the ring rolling start stage, the length of the heating element arrangement space in the area immediately before the inner and outer circumferential pressure reduction is already larger than half the length of the outer circumferential induction heating element in the ring circumferential direction, preferably in the ring tangential direction. It may be.
- the manufacturing method of the ring rolling object includes carrying out ring rolling as follows. As shown in FIGS. 14 and 15, the ring material 1 is rotated in the ring axis direction by a pair of axial rolls 4 and 5 while the ring material 1 is rotated, and the outer peripheral induction heating body moves as described later. These operations are repeated in the order of the operation of inductively heating the entire outer peripheral surface 1 c of the ring material 1 by 8 and the operation of reducing the ring material 1 in the radial direction of the ring by the mandrel roll 2 and the main roll 3. At this time, one or both of the mandrel roll 2 and the main roll 3 are relatively moved in the ring radial direction with respect to the radial center of the ring material 1 so that the diameter of the ring material 1 is increased. Can be transformed into
- the movement of the outer periphery side induction heating body 8 is performed as follows. Between the start stage of the ring rolling shown in FIG. 14 and before the intermediate stage, the center of the outer peripheral induction heating body 8 is in the ring circumferential direction, preferably in the ring tangential direction, in the region immediately before the inner and outer circumferential pressure reduction. It arrange
- the center of the outer peripheral induction heating body 8 is arranged in the region immediately before the inner and outer peripheral pressure reduction in the ring circumferential direction, preferably in the ring tangential direction.
- the center of the outer periphery side induction heating body 8 moves closer to the main roll 3 as the ring rolling proceeds from the middle stage to the completion stage.
- the temperature of the ring material 1 that is induction-heated by the outer peripheral side induction heating body 8 is in the range of about 850 ° C. or more and about 1150 ° C. or less.
- the temperature is not limited to this, and may be adjusted so that the temperature distribution in the radial direction of the ring material can be efficiently controlled within an appropriate temperature range. It may be adjusted to make the temperature distribution uniform.
- the center of the outer periphery side induction heating body 8 is the ring circumferential direction.
- the outer peripheral side induction heating body 8 moves so as to be arranged in the region immediately before the inner and outer peripheral pressure reduction.
- the length S1 of the heating element arrangement space in the region immediately before the inner and outer circumferential pressure reduction is equal to the length T of the outer circumferential induction heating element in the ring circumferential direction, preferably in the ring tangential direction.
- S2 is larger than half of the length T of the outer circumferential induction heating body. Therefore, due to restrictions such as the layout of the rolling device and the shape and dimensions of the ring material 1, it is difficult to place the outer peripheral induction heating body 8 in the region immediately before the inner and outer circumferential pressure reduction at the start of ring rolling.
- the temperature distribution in the radial direction of the ring material 1 is efficiently adjusted to an appropriate temperature range in the inner and outer periphery reduction region immediately after the ring material 1 passes through the region immediately before the inner and outer periphery reduction.
- quality such as dimensional accuracy of the produced ring rolled body can be efficiently increased.
- the rolling device used in the present embodiment includes an outer circumferential induction heating body 9 described below instead of the outer circumferential induction heating body 8 of the first embodiment.
- this rolling apparatus is the same as that of the rolling apparatus used in 1st Embodiment.
- the outer periphery side induction heating body 9 of this embodiment is the same as the outer periphery side induction heating body 8 of 1st Embodiment except for the following points.
- the induction heating coil 9a is spaced apart from the convex portion 1f of the outer peripheral surface 1c of the ring material 1 in the ring radial direction and wound. Is arranged so that the direction of the winding shaft 9b is directed toward the convex portion 1f.
- both end portions of the convex portion 1f in the ring axis direction are disposed within a range sandwiched between both end portions of the induction heating coil 9a in the ring axis direction.
- the end portion in the ring axis direction of the induction heating coil 9a is the edge shape portion 1g formed on the convex portion 1f and the end portion of the ring material 1 in the ring axis direction. It is arranged between.
- the rolling device may have a plurality of outer peripheral induction heating bodies in order to make temperature control of the ring material easier.
- the edge shape portion formed in the outer peripheral side region of the ring material is set to the region immediately before the inner and outer peripheral pressure reduction. It is good to be configured so as to focus on induction heating.
- the direction of the winding axis of the induction heating coil may face other than the convex portion of the outer peripheral surface of the ring material.
- the outer peripheral induction heating body may have a magnetic core around which the induction heating coil is wound.
- the edge shape part of the ring material is formed on the magnetic flux line generated from the magnetic core. Induction heating will occur.
- the outer peripheral edge portion of the induction heating coil 9a is formed in a substantially rectangular shape when viewed from the direction of the winding shaft 9b.
- the outer peripheral edge portion of the induction heating coil is not limited to this, and can be formed in a substantially circular shape, a substantially elliptical shape, a substantially polygonal shape other than a substantially rectangular shape, etc. as viewed from the direction of the winding axis.
- the number of turns of the induction heating coil 9a is preferably plural in accordance with the required magnetic line density within a range in which the coil can be manufactured.
- the manufacturing method of the ring rolling object concerning this embodiment includes carrying out ring rolling as follows with such a rolling device.
- the mandrel roll 2 and the main roll 3 and the pair of axial rolls 4 and 5 rotate, and along with these rotations, the ring material 1 preheated in the same manner as in the first embodiment has its axis line. Rotates around one side in the circumferential direction of the ring (indicated by an arrow F in FIG. 6).
- the temperature of the ring material 1 that is induction-heated by the outer circumferential induction heating body 9 is in the range of about 850 ° C. or more and about 1150 ° C. or less.
- the temperature is not limited to this, and may be adjusted so that the temperature distribution in the radial direction of the ring material can be efficiently controlled within an appropriate temperature range. It may be adjusted to make the temperature distribution uniform.
- the edge-shaped portion 1g in the outer peripheral side region of the ring material 1 that is particularly susceptible to temperature drop is directly induction heated in the region immediately before the inner and outer peripheral pressure reduction.
- the temperature distribution in the radial direction of the ring material 1 can be efficiently controlled in an appropriate temperature range in the inner and outer peripheral pressure reduction regions.
- the same action as that of the first embodiment is obtained except that the action and effect obtained instead of the action and effect obtained by induction heating the entire outer peripheral surface 1c of the ring material 1 are obtained. Actions and effects can be obtained.
- the edge-shaped part 1g of the ring raw material 1 is induction-heated instead of the effect
- FIG. 1 The same operations and effects as those of the specific example of the first embodiment can be obtained except that the operations and effects based on the above can be obtained.
- the rolling apparatus used in this embodiment has a configuration in which an inner peripheral induction heating body is further provided in the rolling apparatus used in the first or second embodiment.
- an inner peripheral induction heating body 10 is provided in the rolling apparatus used in the first embodiment.
- the inner circumferential induction heating body 10 As shown in FIGS. 7 to 9, the inner circumferential induction heating body 10, its induction heating coil 10a, and its winding shaft 10b are the same except for the following points, the outer circumferential induction heating body 8 of the first embodiment, This is the same as the induction heating coil 8a and the winding shaft 8b.
- the inner peripheral induction heating body 10 is disposed on the inner peripheral side of the ring material 1 in the region immediately before the inner and outer peripheral pressure reduction.
- the rolling device may include means for directly induction heating the ring material 1 in addition to the outer circumferential induction heating body 8 and the inner circumferential induction heating body 10.
- the ring material 1 is a pair of axial rolls.
- the outer peripheral induction heating body 8 and the inner peripheral induction heating member 10 are included in the region immediately before the inner and outer peripheral pressure reduction.
- the outer circumferential induction heating body 8 and the inner circumferential induction heating body 10 are arranged so as to face each other in the ring radial direction across the cross section of the ring material 1.
- the means for directly induction heating the ring material 1 may be only the outer peripheral induction heating body 8 and the inner peripheral induction heating body 10.
- Such an inner peripheral induction heating body 10 is configured to induction heat the entire inner peripheral surface 1b of the ring material 1.
- the temperature of the outer peripheral side region of the ring material 1 that is induction-heated by the outer peripheral side induction heating body 8 is set higher than the temperature of the inner peripheral side region of the ring material 1 that is induction-heated by the inner peripheral side induction heating member 10. Is set to
- the rolling apparatus may have a plurality of inner peripheral induction heating bodies in order to make temperature control of the ring material easier.
- the inner periphery side induction heating body, its inner periphery side induction heating coil, and its winding axis are the outer periphery side induction heating body 9, its induction heating coil 9a, and its winding part of 2nd Embodiment except the above-mentioned point. You may comprise similarly to the winding shaft 9b.
- the manufacturing method of the ring rolling object concerning this embodiment includes carrying out ring rolling as follows with such a rolling device. As shown in FIGS. 7 and 8, in such ring rolling, the mandrel roll 2 and the main roll 3 and the pair of axial rolls 4 and 5 are rotated, and with these rotations, in advance as in the first embodiment.
- the heated ring material 1 rotates around the axis 1a to one side (indicated by arrow F) in the ring circumferential direction.
- the ring material 1 is squeezed in the ring axis direction by the pair of axial rolls 4 and 5 and is arranged on the inner and outer peripheral sides of the ring material 1 in the region immediately before the inner and outer peripheral pressure reduction.
- Induction heating of the entire inner and outer peripheral surfaces 1b and 1c of the ring material 1 by the outer peripheral side induction heating body 8 and the inner peripheral side induction heating body 10, and the mandrel roll 2 and the main roll 3 reduce the ring material 1 in the ring radial direction.
- These operations are repeated in the order of operations.
- one or both of the mandrel roll 2 and the main roll 3 are relatively moved in the ring radial direction with respect to the radial center of the ring material 1 so that the diameter of the ring material 1 is increased.
- the temperature of the outer peripheral side region of the ring material 1 that is induction heated by the outer peripheral side induction heating body 8 is set to the temperature of the inner peripheral side region of the ring material 1 that is induction heated by the inner peripheral side induction heating member 10. Make it higher than the temperature.
- the temperatures of the outer peripheral side region and the inner peripheral side region of the ring material 1 that are induction-heated by the outer peripheral side induction heating member 8 and the inner peripheral side induction heating member 10 are about 850 ° C. and about 1150 ° C., respectively. It is preferable to be within the range. However, these temperatures are not limited to this, and may be adjusted so that the temperature distribution in the radial direction of the ring material can be efficiently controlled to an appropriate temperature range. As an example, the radial direction of the ring material It is preferable that the temperature distribution is adjusted to be uniform.
- the temperature at which the outer peripheral side region of the ring material 1 that is likely to decrease in temperature is inductively heated in the region immediately before the inner and outer peripheral pressure reduction induces the inner peripheral side region of the ring material 1. Since the outer peripheral side and the inner peripheral side portion of the ring material 1 are induction-heated so as to be higher than the heating temperature, the ring material 1 has a ring in the inner and outer peripheral pressure reduction region immediately after passing through the inner and outer peripheral pressure reduction region.
- the temperature distribution in the radial direction of the material 1 can be efficiently controlled within an appropriate temperature range, and as a result, the quality such as the dimensional accuracy of the produced ring rolled body can be efficiently increased.
- the rolling mill has the outer peripheral side induction heating body 8 of the specific example of the first embodiment instead of the outer peripheral side induction heating body 8 of the third embodiment. You can also.
- the inner circumferential induction heating body 10 may be configured to move following the movement of the outer circumferential induction heating body 8 in the ring circumferential direction.
- the manufacturing method of the ring rolled body according to this specific example is the same as the specific example of the first embodiment in which the outer peripheral induction heating body 8 is operated in the manufacturing method of the ring rolled body according to the third embodiment. It has become.
- the manufacturing method of the ring rolling body which concerns on a specific example, in addition to the effect
- the rolling mill has the outer peripheral side induction heating body 9 of the specific example of the second embodiment instead of the outer peripheral side induction heating body 8 of the third embodiment.
- the inner circumferential induction heating body 10 may be configured to move following the movement of the outer circumferential induction heating body 9 in the ring circumferential direction.
- the method for manufacturing a rolled ring body according to this example is the same as the method for manufacturing the ring rolled body according to the third embodiment, in which the outer peripheral induction heating body 9 is operated in the same manner as the specific example of the second embodiment. It has become.
- the manufacturing method of the ring rolling body which concerns on a specific example, in addition to the effect
- the rolling apparatus used in the present embodiment includes an induction heating body 11 described below instead of the outer peripheral side induction heating body 8 of the first or third embodiment.
- Such a rolling device is the same as the rolling device used in the first or third embodiment.
- the induction heating body 11, its induction heating coil 11a, and its winding shaft 11b of this embodiment are the outer periphery side induction heating body 8 of 1st Embodiment, its induction except the following points. This is the same as the heating coil 8a and its winding shaft 8b.
- the outer peripheral edge portion of the induction heating coil 11a is formed in a substantially elliptical shape when viewed from the direction of the winding shaft 11b, and the major axis thereof is relative to the axis 1a of the ring material 1. Oriented so as to be inclined in the circumferential direction of the ring.
- Each of both edges in the ring circumferential direction at the outer peripheral edge portion of the induction heating coil 11a is between the both ends in the ring axial direction on the outer circumferential surface 1c of the ring material 1 with respect to the axis 1a of the ring material 1 in the ring circumferential direction. It has the inclination part 11c arrange
- the inclination of the inclined portion 11c with respect to the axis 1a of the ring material 1 depends on the feed speed of the ring material 1 and the metal material used for the ring material 1.
- the ring material 1, the shape of the ring material 1, the distance between the ring material 1 and the induction heating coil 11a, the temperature at which the ring material 1 is preheated before ring rolling, the temperature at which the ring material 1 is induction heated, etc. Can be determined.
- the number of turns of the induction heating coil 11a is preferably plural in accordance with the required magnetic line density within a range in which the coil can be manufactured.
- the induction heating coil is not limited to this, and the outer peripheral edge portion of the induction heating coil only needs to have at least one inclined portion.
- the outer peripheral edge portion of the induction heating coil is preferably formed in a substantially polygonal shape including such an inclined portion when viewed from the direction of the winding axis.
- the induction heating coil 11 a may be configured such that the inclination of the inclined portion 11 c with respect to the axis 1 a of the ring material 1 can be adjusted.
- the induction heating coil 11a can be configured to be rotatable around its winding axis 11b or other axis along the radial direction of the ring by a rotation mechanism (not shown).
- the inclination of the inclined portion 11c with respect to the axis 1a of the ring material 1 is made smaller than the inclination of the inclined portion 11c shown in FIG. 10 by the rotation of the induction heating coil 11a around the winding shaft 11b. The state is shown.
- Such an induction heating body 11 is preferably arranged in the same manner as the outer periphery side induction heating body 8 of the first embodiment from the viewpoint of obtaining the same operation and effect as the first embodiment.
- the induction heating body 11 can be arranged on the outer peripheral side of the ring material 1 not only in the outer peripheral side of the region immediately before the inner and outer peripheral pressure reduction, but also in other regions.
- the inner circumferential induction heating body 10 is used.
- the induction heating body corresponding to can be configured in the same manner as the induction heating body 11 except that the inner peripheral side of the ring material 1 is induction heated.
- the manufacturing method of the ring rolling object concerning this embodiment includes carrying out ring rolling as follows with such a rolling device.
- the mandrel roll 2 and the main roll 3 and the pair of axial rolls 4 and 5 rotate, and the ring material 1 heated in advance in the same manner as in the first or third embodiment is accompanied by the rotation.
- Rotate around one axis 1a in the circumferential direction of the ring (indicated by an arrow F in FIGS. 10 and 11).
- the temperature of the ring material 1 that is induction-heated by the induction heating body 11 is in the range of about 850 ° C. or more and about 1150 ° C. or less.
- this temperature is not limited to this, and it is good to adjust the temperature distribution in the radial direction of the ring material to be efficiently controlled to an appropriate temperature range.
- the temperature distribution in the radial direction of the ring material It is good to adjust so that it may become uniform.
- the inclination of the inclined portion 11c of the induction heating coil 11a with respect to the axis 1a of the ring material 1 is changed according to the feed speed of the ring material 1. It can be changed by a rotating mechanism. In particular, the inclination of the inclined portion 11c with respect to the axis 1a of the ring material 1 is changed so that the time required for the ring material 1 to pass under the line of magnetic force of the induction heating coil 11a is changed according to various parts of the surface of the ring material 1. In the case of adjustment, the temperature of the ring material 1 that is induction-heated by the induction heating body 11 can be controlled to be in an appropriate rolling temperature range.
- the longitudinal direction of the inclined portion 11c with respect to the axis 1a of the ring material 1 is inclined so as to approach the ring circumferential direction when the feed speed of the ring material 1 is increased.
- the tilt when the feed speed of the ring material 1 is decreased, it is preferable to adjust the tilt so as to approach the ring axis direction.
- the rotation mechanism allows the inclination of the inclined portion with respect to the axis of the ring material to be adjusted according to the feed speed of the ring material and the metal material used for the ring material. It is also possible to adjust according to at least one of the type, the shape of the ring material, the distance between the ring material and the induction heating coil, the temperature for preheating the ring material, the temperature for induction heating the ring material, and the like.
- the peripheral part of induction heating coil 11a has inclined part 11c arranged along the direction inclined with respect to the peripheral direction or axial direction of ring material 1. Therefore, the magnetic field range in the induction heating coil 11a can be changed along the axial direction so as to efficiently control the temperature distribution in the axial direction on the outer peripheral surface 1c of the ring material 1 to an appropriate temperature range, As a result, the quality such as the dimensional accuracy of the produced ring rolled body can be efficiently increased.
- induction heating coil 11a Since the outer peripheral edge portion of 11a is inclined with respect to the circumferential direction or axial direction of the ring material 1, so as to efficiently control the temperature distribution in the axial direction on the outer peripheral surface 1c of the ring material 1 to a more appropriate temperature range.
- the range of the magnetic field in the induction heating coil 11a can be changed along the axial direction, and as a result, the quality such as the dimensional accuracy of the produced ring rolled body can be more efficiently increased.
- the outer peripheral edge portion of the induction heating coil 12a of the induction heating body 12 can be formed in a substantially parallelogram shape.
- Each of both edges in the ring circumferential direction of the induction heating coil 12a is located on the other side in the ring circumferential direction with respect to the axis 1a of the ring material 1 between both ends in the ring axial direction on the outer circumferential surface 1c of the ring material 1.
- An inclined portion 12c that is inclined is provided.
- the winding shaft 12b of the induction heating coil 12a is oriented in the same manner as the winding shaft 11b of the induction heating coil 11a of the fourth embodiment.
- the rolling device used in the present embodiment has an induction heating body 13 described below instead of the outer peripheral side induction heating body 8 of the first or third embodiment.
- Such a rolling device is the same as the rolling device used in the first or third embodiment.
- the induction heating body 13, its induction heating coil 13a, and its winding shaft 13b of this embodiment are the outer periphery side induction heating body 8 of 1st Embodiment, its induction except the following points. This is the same as the heating coil 8a and its winding shaft 8b.
- the outer peripheral edge portion of the induction heating coil 13a is formed in a substantially rhombus shape when viewed from the direction of the winding shaft 13b.
- Each of the edges in the ring circumferential direction at the outer peripheral edge portion of the induction heating coil 13a is directed toward the both ends in the ring axis direction from the substantially central part in the ring axis direction on the outer circumferential surface 1c of the ring material 1 respectively. It has two inclined parts 13c which incline to the center side of the ring circumferential direction of the induction heating coil 13a with respect to one axis line 1a.
- the inclination of the inclined portion 13c with respect to the axis 1a of the ring material 1 is determined based on the feed speed of the ring material 1 and the metal material used for the ring material 1.
- the shape of the ring material 1, the distance between the ring material 1 and the induction heating coil 13a, the temperature at which the ring material 1 is preheated before ring rolling, the temperature at which the ring material 1 is induction heated, etc. can be determined.
- the number of turns of the induction heating coil 13a is preferably plural in accordance with the required magnetic line density within a range in which the coil can be manufactured.
- the induction heating coil is not limited to this, and at least one edge portion in the ring circumferential direction at the outer peripheral edge portion of the induction heating coil may have two inclined portions.
- the outer peripheral edge portion of the induction heating coil may be formed in a substantially polygonal shape including these inclined portions as seen from the direction of the winding axis.
- the induction heating coil 13a may be configured so that the inclination of the inclined portion 13c with respect to the axis 1a of the ring material 1 can be adjusted.
- the induction heating coil 13a can be configured to be rotatable around a winding axis 13b or another axis along the ring radial direction by a rotation mechanism (not shown).
- Such an induction heating body 13 is preferably arranged in the same manner as the outer periphery side induction heating body 8 of the first embodiment from the viewpoint of obtaining the same operation and effect as those of the first embodiment.
- the induction heating body 13 can be arranged on the outer peripheral side of the ring material 1 not only in the outer peripheral side of the region immediately before the inner and outer peripheral pressure reduction, but also in other regions.
- the rolling apparatus used in this embodiment is the same as the rolling apparatus used in the third embodiment except for the induction heating body 13 described above, the inner circumferential induction heating body 10 is used.
- the induction heating body corresponding to can be configured in the same manner as the induction heating body 13 described so far, except that the inner peripheral side of the ring material 1 is induction heated.
- the manufacturing method of the ring rolling object concerning this embodiment includes carrying out ring rolling as follows with such a rolling device.
- the mandrel roll 2 and the main roll 3 and the pair of axial rolls 4 and 5 rotate, and the ring material 1 heated in advance in the same manner as in the first or third embodiment is accompanied by the rotation.
- the temperature of the ring material 1 that is induction-heated by the induction heating body 13 is in the range of about 850 ° C. or more and about 1150 ° C. or less.
- this temperature is not limited to this, and it is good to adjust the temperature distribution in the radial direction of the ring material to be efficiently controlled to an appropriate temperature range.
- the temperature distribution in the radial direction of the ring material It is good to adjust so that it may become uniform.
- the inclination of the inclined portion 13c of the induction heating coil 13a with respect to the axis 1a of the ring material 1 can be changed by the rotation mechanism in accordance with the feed speed of the ring material 1 during ring rolling or before ring rolling.
- the inclination of the inclined portion 13c with respect to the axis 1a of the ring material 1 is changed so that the time required for the ring material 1 to pass under the line of magnetic force of the induction heating coil 13a is changed according to various parts of the surface of the ring material 1.
- the temperature of the ring material 1 induction-heated by the induction heating body 13 can be controlled so as to be in an appropriate rolling temperature range.
- the inclination of the inclined portion 13c with respect to the axis 1a of the ring material 1 is changed by the rotation mechanism during the ring rolling or before the ring rolling.
- Feed rate of material 1 type of metal material used for ring material 1, shape of ring material 1, distance between ring material 1 and induction heating coil 13a, temperature for preheating ring material 11, induction heating of ring material 1 It is also possible to adjust in accordance with at least one of the temperature to be performed.
- the induction heating coil is configured using a rotating mechanism configured to be able to change the inclination of the induction heating coil 13a with respect to the circumferential direction or the axial direction of the ring material 1. Since the outer peripheral edge portion of 13a is inclined with respect to the circumferential direction or axial direction of the ring material 1, so as to efficiently control the temperature distribution in the axial direction on the outer peripheral surface 1c of the ring material 1 to a more appropriate temperature range. The range of the magnetic field in the induction heating coil 13a can be changed along the axial direction, and as a result, the quality such as the dimensional accuracy of the produced ring rolled body can be increased more efficiently.
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Abstract
Description
本発明の第1実施形態に係るリング圧延体の製造方法について以下に説明する。
最初に、リング圧延に用いられる圧延装置の概略について説明する。図1及び図2に示すように、圧延装置は、軸線1aを基準として略回転対称に形成されるリング素材1を装着可能に構成されている。かかる圧延装置は、リング素材1の内外周面1b,1cにそれぞれ接触すると共にリング素材1をその径方向(以下、「リング径方向」という)にて圧下するように構成されるマンドレルロール2及び主ロール3と、リング素材1における軸線1aの方向(以下、「リング軸線方向」という)の両端面1d,1eに接触すると共にリング素材1をリング軸線方向にて圧下するように構成される一対のアキシャルロール4,5とを備えている。しかしながら、本発明は、一対のアキシャルロール4,5を備えない圧延装置にも適用可能である。圧延装置はまた、リング素材1と接触可能に構成された2つのガイドロール6,7を備えている。圧延装置は、リング素材1を直接的に誘導加熱するように構成された1つの外周側誘導加熱体8をさらに備えている。
図1及び図2に示すように、マンドレルロール2は、リング素材1の内周面1bに接触可能に構成される周面2aを有し、かつ主ロール3は、リング素材1の外周面1cに接触可能に構成される周面3aを有している。このような周面2a,3aは、それぞれ、回転軸線2b,3bを基準として略回転対称になっている。マンドレルロール2及び主ロール3のそれぞれは、回転軸線2b,3bを中心に回転可能に構成されている。マンドレルロール2及び主ロール3の一方又は両方は、駆動機構(図示せず)によって回転駆動可能に構成されると好ましい。マンドレルロール2及び主ロール3はまた、必要に応じて、その回転速度を制御可能とするように構成されると好ましい。特に、リング素材1の内周側に形成される空間は、リング素材1の外周側に形成される空間と比較して、駆動機構の配置スペースを十分に確保し難いという実情を鑑みれば、マンドレルロール2及び主ロール3のうち主ロール3が回転駆動可能に構成されると好ましい。
図1及び図2に示すように、一対のアキシャルロール4,5は、主ロール3に対してリング周方向に間隔を空けて配置されている。一対のアキシャルロール4,5は、主ロール3に対してリング素材1の軸線1aを中心に角度θ間隔を空けて配置することができる。典型的には、角度θは約180度であると好ましく、言い換えれば、一対のアキシャルロール4,5は、主ロール3に対してリング周方向に間隔を空けると共にリング径方向に対向するように配置されると好ましい。しかしながら、角度θは、これに限定されず、高品質のリング圧延体を作製可能であれば、約0度より大きくかつ約360度よりも小さな範囲内としてもよく、約90度以上かつ約270度以下の範囲内としてもよく、約135度以上かつ約225度以下の範囲内としてもよい。
図1及び図2に示すように、2つのガイドロール6,7のうち一方側のガイドロール6は、一対のアキシャルロール4,5からリング周方向の一方側(矢印Fにより示す)に向かって主ロール3に至る範囲に配置されている。2つのガイドロール6,7のうち他方側のガイドロール7は、一対のアキシャルロール4,5からリング周方向の他方側に向かって主ロール3に至る範囲に配置されている。
図1~図4に示すように、外周側誘導加熱体8は、少なくとも一周周回するように巻かれた巻線を有する誘導加熱コイル8aを備えており、外周側誘導加熱体8は、誘導加熱コイル8aの巻線に交流電流を流すことによって、誘導加熱のための磁界を発生させるように構成されている。外周側誘導加熱体8はまた移動可能に構成されている。
次に、リング圧延体の製造方法について説明する。かかる製造方法においては、予め加熱したリング素材1を上述の圧延装置によってリング圧延する。このとき、予め加熱されるリング素材1の温度は、約850℃以上かつ約1150℃以下の範囲であると好ましい。しかしながら、かかる温度は、これに限定されず、高品質のリング圧延体を作製するように、リング素材に用いられる金属材料の種類に応じて調節可能である。
本実施形態に係るリング圧延体の製造方法によれば、内外周圧下直前領域にて、リング素材1の内周側領域と比較して温度低下し易いリング素材1の外周面1c又は外周側領域が誘導加熱されるので、リング素材1が内外周圧下直前領域を通過した直後にマンドレルロール2及び主ロール3間にて圧下を行う領域(以下、「内外周圧下領域」という)にて、リング素材1の径方向の温度分布を適切な温度範囲に効率的に制御でき、その結果、作製されるリング圧延体の寸法精度等の品質を効率的に高めることができる。また、リング素材1の温度低下に伴ってリング素材1の表面及び内部間の温度分布が不均一になることを抑制できるので、作製されるリング圧延体の全体にて結晶粒の混粒化を抑制できる。すなわち、作製されるリング圧延体の全体にて結晶粒の整粒化を促すことができる。
本発明の第1実施形態の具体例として、第1実施形態の外周側誘導加熱体8をさらに以下のように構成し、かつかかる外周側誘導加熱体8を用いてリング圧延体の製造方法を以下のように実施することができる。
図14及び図15に示すように、外周側誘導加熱体8に関連する内外周圧下直前領域は、リング周方向にて基準線分Lと境界線分Mとの間に位置し、一方側のガイドロール6は、かかる内外周圧下直前領域のリング周方向の中間に配置される。
本具体例に係るリング圧延体の製造方法は、次のようにリング圧延することを含む。図14及び図15に示すように、リング素材1が回転した状態で、一対のアキシャルロール4,5によってリング素材1をリング軸線方向に圧下する作業、後述のように移動する外周側誘導加熱体8によってリング素材1の外周面1c全体を誘導加熱する作業、マンドレルロール2及び主ロール3によってリング素材1をリング径方向に圧下する作業の順に、これらの作業を繰り返す。このとき、マンドレルロール2及び主ロール3の一方又は両方を、リング素材1の径方向の中心を基準としてリング径方向に相対的に移動させることによって、リング素材1を、その直径を拡大するように変形させることができる。
本具体例に係るリング圧延体の製造方法によれば、外周側誘導加熱体8が主ロール3と一方側のガイドロール6との間に位置することに基づく効果を除いて、第1実施形態と同様の作用及び効果を得ることができる。
本発明の第2実施形態に係るリング圧延体の製造方法について以下に説明する。なお、本実施形態に係るリング圧延体の製造方法は、リング素材1の外周側領域に、エッジ形状部を有する凸部分が形成される場合に好適に用いられる。
図5及び図6に示すように、本実施形態にて用いられる圧延装置は、第1実施形態の外周側誘導加熱体8の代わりに以下に述べる外周側誘導加熱体9を有するが、その他の構成について、かかる圧延装置は、第1実施形態にて用いられる圧延装置と同様になっている。
図5及び図6に示すように、本実施形態の外周側誘導加熱体9は、以下の点を除いて、第1実施形態の外周側誘導加熱体8と同様である。第1実施形態と異なる点を述べると、外周側誘導加熱体9においては、誘導加熱コイル9aが、リング素材1の外周面1cの凸部分1fに対してリング径方向に間隔を空けると共に巻線の巻き軸9bの方向を凸部分1fに向けるように配置されている。また、凸部分1fのリング軸線方向の両端部が、誘導加熱コイル9aにおけるリング軸線方向の両端部に挟まれる範囲内に配置されている。図5及び図6においては、一例として、誘導加熱コイル9aにおけるリング軸線方向の端部が、凸部分1fに形成されるエッジ形状部1gとリング素材1の外周面1cにおけるリング軸線方向の端部との間に配置されている。かかる誘導加熱コイル9aによって、内外周圧下直前領域にてリング素材1のエッジ形状部1gを重点的に誘導加熱することができる。
本実施形態に係るリング圧延体の製造方法は、このような圧延装置によって、次のようにリング圧延することを含む。かかるリング圧延においては、マンドレルロール2及び主ロール3並びに一対のアキシャルロール4,5が回転し、これらの回転に伴って、第1実施形態と同様に予め加熱されたリング素材1が、その軸線1aを中心としてリング周方向の一方側(図6にて矢印Fにより示す)に回転する。さらに、リング素材1が回転した状態で、一対のアキシャルロール4,5によってリング素材1をリング軸線方向に圧下する作業、内外周圧下直前領域にてリング素材1の外周側に配置される外周側誘導加熱体9によってリング素材1のエッジ形状部1gを誘導加熱する作業、マンドレルロール2及び主ロール3によってリング素材1をリング径方向に圧下する作業の順に、これらの作業を繰り返す。このとき、マンドレルロール2及び主ロール3の一方又は両方を、リング素材1の径方向の中心を基準としてリング径方向に相対的に移動させることによって、リング素材1を、その直径を拡大するように変形させることができる。
本実施形態に係るリング圧延体の製造方法によれば、内外周圧下直前領域にて、特に温度低下し易いリング素材1の外周側領域のエッジ形状部1gが直接的に誘導加熱されるので、内外周圧下領域にてリング素材1の径方向の温度分布を適切な温度範囲に効率的に制御できる。さらに、本実施形態によれば、リング素材1の外周面1c全体を誘導加熱することにより得られる作用及び効果の代わりにかかる作用及び効果が得られる点を除いて、第1実施形態と同様の作用及び効果を得ることができる。
本発明の第2実施形態の具体例として、第2実施形態の外周側誘導加熱体9の構成に、第1実施形態の具体例にて記載した外周側誘導加熱体8の構成を適用することができる。また、かかる外周側誘導加熱体9を用いたリング圧延体の製造方法は、リング素材1の外周面1c全体を誘導加熱する代わりにリング素材1のエッジ形状部1gを誘導加熱する点を除いて、第1実施形態の具体例に係るものと同様になっている。さらに、本具体例に係るリング圧延体の製造方法によれば、リング素材1の外周面1c全体を誘導加熱することに基づく作用及び効果の代わりにリング素材1のエッジ形状部1gを誘導加熱することに基づく作用及び効果が得られる点を除いて、第1実施形態の具体例と同様の作用及び効果を得ることができる。
本発明の第3実施形態に係るリング圧延体の製造方法について以下に説明する。
本実施形態にて用いられる圧延装置は、第1又は第2実施形態にて用いられる圧延装置に、内周側誘導加熱体をさらに設けた構成となっている。以下においては、図7~図9に示すように、第1実施形態にて用いられる圧延装置に内周側誘導加熱体10を設けた場合について説明する。しかしながら、第2実施形態に用いられる圧延装置に内周側誘導加熱体を設けることも可能である。
図7~図9に示すように、内周側誘導加熱体10、その誘導加熱コイル10a、及びその巻き軸10bは、以下の点を除いて、第1実施形態の外周側誘導加熱体8、その誘導加熱コイル8a、及びその巻き軸8bと同様である。第1実施形態と異なる点を述べると、内周側誘導加熱体10は、内外周圧下直前領域にてリング素材1の内周側に配置されている。
本実施形態に係るリング圧延体の製造方法は、このような圧延装置によって、次のようにリング圧延することを含む。図7及び図8に示すように、かかるリング圧延においては、マンドレルロール2及び主ロール3並びに一対のアキシャルロール4,5が回転し、これらの回転に伴って、第1実施形態と同様に予め加熱されたリング素材1が、その軸線1aを中心としてリング周方向の一方側(矢印Fにより示す)に回転する。さらに、リング素材1が回転した状態で、一対のアキシャルロール4,5によってリング素材1をリング軸線方向に圧下する作業、内外周圧下直前領域にてリング素材1の内外周側にそれぞれ配置される外周側誘導加熱体8及び内周側誘導加熱体10によってリング素材1の内外周面1b,1c全体を誘導加熱する作業、マンドレルロール2及び主ロール3によってリング素材1をリング径方向に圧下する作業の順に、これらの作業を繰り返す。このとき、マンドレルロール2及び主ロール3の一方又は両方を、リング素材1の径方向の中心を基準としてリング径方向に相対的に移動させることによって、リング素材1を、その直径を拡大するように変形させることができる。
本実施形態に係るリング圧延体の製造方法によれば、内外周圧下直前領域にて、温度低下し易いリング素材1の外周側領域を誘導加熱する温度がリング素材1の内周側領域を誘導加熱する温度よりも高くなるように、リング素材1の外周側及び内周側部分が誘導加熱されるので、リング素材1が内外周圧下直前領域を通過した直後の内外周圧下領域にて、リング素材1の径方向の温度分布を適切な温度範囲に効率的に制御でき、その結果、作製されるリング圧延体の寸法精度等の品質を効率的に高めることができる。
本発明の第3実施形態の第1具体例として、圧延装置が、第3実施形態の外周側誘導加熱体8の代わりに、第1実施形態の具体例の外周側誘導加熱体8を有することもできる。なお、本具体例において、内周側誘導加熱体10は、リング周方向にて外周側誘導加熱体8の移動に追従して移動するように構成されてもよい。本具体例に係るリング圧延体の製造方法は、第3実施形態に係るリング圧延体の製造方法にて、外周側誘導加熱体8を第1実施形態の具体例と同様に動作させたものとなっている。さらに、本具体例に係るリング圧延体の製造方法によれば、第1実施形態の具体例における作用及び効果に加えて、第3実施形態に記載された作用及び効果を得ることができる。
本発明の第3実施形態の第2具体例として、圧延装置が、第3実施形態の外周側誘導加熱体8の代わりに、第2実施形態の具体例の外周側誘導加熱体9を有することもできる。なお、本具体例において、内周側誘導加熱体10は、リング周方向にて外周側誘導加熱体9の移動に追従して移動するように構成されてもよい。本具体例に係るリング圧延体の製造方法は、第3実施形態に係るリング圧延体の製造方法にて、外周側誘導加熱体9を第2実施形態の具体例と同様に動作させたものとなっている。さらに、本具体例に係るリング圧延体の製造方法によれば、第2実施形態の具体例における作用及び効果に加えて、第3実施形態に記載された作用及び効果を得ることができる。
本発明の第4実施形態に係るリング圧延体の製造方法について以下に説明する。
図10に示すように、本実施形態にて用いられる圧延装置は、第1又は第3実施形態の外周側誘導加熱体8の代わりに以下に述べる誘導加熱体11を有するが、その他の構成について、かかる圧延装置は、第1又は第3実施形態にて用いられる圧延装置と同様になっている。
図10に示すように、本実施形態の誘導加熱体11、その誘導加熱コイル11a、及びその巻き軸11bは、以下の点を除いて、第1実施形態の外周側誘導加熱体8、その誘導加熱コイル8a、及びその巻き軸8bと同様である。第1実施形態と異なる点を述べると、誘導加熱コイル11aの外周縁部分は、巻き軸11bの方向から見て略楕円形状に形成され、かつその長軸をリング素材1の軸線1aに対してリング周方向に傾斜させるように配向されている。かかる誘導加熱コイル11aの外周縁部分におけるリング周方向の両縁部のそれぞれは、リング素材1の外周面1cにおけるリング軸線方向の両端部間にてリング素材1の軸線1aに対してリング周方向に傾斜する方向に沿って配置された傾斜部11cを有している。
本実施形態に係るリング圧延体の製造方法は、このような圧延装置によって、次のようにリング圧延することを含む。かかるリング圧延においては、マンドレルロール2及び主ロール3並びに一対のアキシャルロール4,5が回転し、これらの回転に伴って、第1又は第3実施形態と同様に予め加熱されたリング素材1が、その軸線1aを中心としてリング周方向の一方側(図10及び図11にて矢印Fにより示す)に回転する。さらに、リング素材1が回転した状態で、一対のアキシャルロール4,5によってリング素材1をリング軸線方向に圧下する作業、内外周圧下直前領域にてリング素材1の外周側に配置される誘導加熱体11の誘導加熱コイル11aによって少なくともリング素材1の外周面1c又は外周側領域を誘導加熱する作業、マンドレルロール2及び主ロール3によってリング素材1をリング径方向に圧下する作業の順に、これらの作業を繰り返す。このとき、マンドレルロール2及び主ロール3の一方又は両方を、リング素材1の径方向の中心を基準としてリング径方向に相対的に移動させることによって、リング素材1を、その直径を拡大するように変形させることができる。
本実施形態に係るリング圧延体の製造方法によれば、誘導加熱コイル11aの外周縁部分が、リング素材1の周方向又は軸線方向に対して傾いた方向に沿って配置された傾斜部11cを有するので、リング素材1の外周面1cにおける軸線方向の温度分布を適切な温度範囲に効率的に制御するように、誘導加熱コイル11aにおける磁界の範囲を軸線方向に沿って変化させることができ、その結果、作製されるリング圧延体の寸法精度等の品質を効率的に高めることができる。
第4実施形態の変形例として、図12に示すように、誘導加熱体12の誘導加熱コイル12aの外周縁部分を略平行四辺形形状に形成することができる。誘導加熱コイル12aにおけるリング周方向の両縁部のそれぞれには、リング素材1の外周面1cにおけるリング軸線方向の両端部間にてリング素材1の軸線1aに対してリング周方向の他方側に傾斜する傾斜部12cが設けられている。なお、誘導加熱コイル12aの巻き軸12bは、第4実施形態の誘導加熱コイル11aの巻き軸11bと同様に配向されている。
本発明の第5実施形態に係るリング圧延体の製造方法について以下に説明する。
図13に示すように、本実施形態にて用いられる圧延装置は、第1又は第3実施形態の外周側誘導加熱体8の代わりに以下に述べる誘導加熱体13を有するが、その他の構成について、かかる圧延装置は、第1又は第3実施形態にて用いられる圧延装置と同様になっている。
図13に示すように、本実施形態の誘導加熱体13、その誘導加熱コイル13a、及びその巻き軸13bは、以下の点を除いて、第1実施形態の外周側誘導加熱体8、その誘導加熱コイル8a、及びその巻き軸8bと同様である。第1実施形態と異なる点を述べると、誘導加熱コイル13aの外周縁部分は、巻き軸13bの方向から見て略菱形形状に形成されている。かかる誘導加熱コイル13aの外周縁部分におけるリング周方向の両縁部のそれぞれは、リング素材1の外周面1cにおけるリング軸線方向の略中央部からそのリング軸線方向の両端部にそれぞれ向かうに従ってリング素材1の軸線1aに対して誘導加熱コイル13aのリング周方向の中心側に傾斜する2つの傾斜部13cを有している。
本実施形態に係るリング圧延体の製造方法は、このような圧延装置によって、次のようにリング圧延することを含む。かかるリング圧延においては、マンドレルロール2及び主ロール3並びに一対のアキシャルロール4,5が回転し、これらの回転に伴って、第1又は第3実施形態と同様に予め加熱されたリング素材1が、その軸線1aを中心としてリング周方向の一方側(図13にて矢印Fにより示す)に回転する。さらに、リング素材1が回転した状態で、一対のアキシャルロール4,5によってリング素材1をリング軸線方向に圧下する作業、内外周圧下直前領域にてリング素材1の外周側に配置される誘導加熱体13の誘導加熱コイル13aによって少なくともリング素材1の外周面1c又は外周側領域を誘導加熱する作業、マンドレルロール2及び主ロール3によってリング素材1をリング径方向に圧下する作業の順に、これらの作業を繰り返す。このとき、マンドレルロール2及び主ロール3の一方又は両方を、リング素材1の径方向の中心を基準としてリング径方向に相対的に移動させることによって、リング素材1を、その直径を拡大するように変形させることができる。
本実施形態に係るリング圧延体の製造方法によれば、誘導加熱コイル13aの外周縁部分が、リング素材1の周方向又は軸線方向に対して傾いた方向に沿って配置された2つの傾斜部13cを有するので、リング素材1の外周面1cにおける軸線方向の温度分布を適切な温度範囲に効率的に制御するように、誘導加熱コイル13aにおける磁界の範囲を軸線方向に沿って変化させることができ、その結果、作製されるリング圧延体の寸法精度等の品質を効率的に高めることができる。
1a 軸線
1b 内周面
1c 外周面
1d,1e 軸線方向の端面
1g エッジ形状部
2 マンドレルロール
3 主ロール
3a 周面
4,5 アキシャルロール
6,7 ガイドロール
8,9 外周側誘導加熱体
8a,9a 誘導加熱コイル
8b,9b 巻き軸
10 内周側誘導加熱体
11,12,13 誘導加熱体
11a,12a,13a 誘導加熱コイル
11b,12b,13b 巻き軸
11c,12c,13c 傾斜部
θ,φ 角度
F,B,R1,R2,R3,R4 矢印
L 基準線分
M 境界線分
S1,S2,T 長さ
Claims (10)
- リング素材をその周方向に回転させた状態で前記リング素材の内外周面にそれぞれ接触すると共に前記リング素材をその径方向にて圧下するように構成される回転可能なマンドレルロール及び主ロールと、前記リング素材を誘導加熱するように構成される少なくとも1つの誘導加熱体とを備える圧延装置を用いて、前記リング素材からリング圧延体を形作るリング圧延体の製造方法であって、
前記少なくとも1つの誘導加熱体が、前記リング素材の外周側領域を誘導加熱するように前記リング素材の外周側に配置される外周側誘導加熱体を含み、
さらに、前記リング素材の軸線方向から見た場合に、前記外周側誘導加熱体における前記リング素材の外周側領域の周方向に対応する方向の中心が、前記リング素材の回転軸及び前記主ロールの回転軸を前記リング素材の径方向に結んだ基準線分と、前記基準線分に対して前記リング素材の回転軸を中心に前記リング素材の回転方向とは逆方向に90度以下の角度にて回転させた境界線分とによって前記リング素材の周方向にて挟まれた内外周圧下直前領域内に配置される、リング圧延体の製造方法。 - 前記圧延装置が、前記リング素材をその周方向に回転させた状態で前記リング素材の軸線方向の両端面にそれぞれ接触すると共に該リング素材を前記リング素材の軸線方向にて圧下するように構成され、かつ前記主ロールに対して前記リング素材の周方向に間隔を空けて配置される一対の回転可能なアキシャルロールをさらに備え、
前記外周側誘導加熱体と前記主ロールとの間における前記リング素材の周方向の間隔が、前記外周側誘導加熱体と前記一対のアキシャルロールとの間における前記リング素材の周方向の間隔よりも小さくなるように設定される、請求項1に記載のリング圧延体の製造方法。 - 前記圧延装置を用いて前記リング素材を圧下する作業を有するリング圧延を実施する工程であって、前記リング圧延中に前記リング素材の直径が拡大され、かつ前記リング圧延中に前記少なくとも1つの誘導加熱体によって前記リング素材が誘導加熱される、工程を含み、
前記外周側誘導加熱体が移動可能に構成され、
前記リング圧延の途中段階以降に、前記リング素材の軸線方向から見た場合に前記リング素材の周方向にて前記外周側誘導加熱体の中心が前記内外周圧下直前領域内に配置されるように、前記外周側誘導加熱体が移動すると共に、前記外周側誘導加熱体が前記リング素材を誘導加熱する、請求項1に記載のリング圧延体の製造方法。 - 前記圧延装置が、前記内外周圧下直前領域内で前記リング素材の外周側に配置されると共に前記リング素材に接触可能に構成された回転可能なガイドロールをさらに備え、
前記リング圧延の途中段階よりも前では、前記リング素材の周方向にて、前記内外周圧下直前領域内で前記リング素材の外周側かつ前記ガイドロール及び前記境界線分間に位置する加熱体配置空間の長さが前記外周側誘導加熱体の長さの半分以下となっており、前記外周側誘導加熱体の中心が前記内外周圧下直前領域外に位置し、
前記リング圧延の途中段階以降に、前記リング素材の直径の拡大によって、前記リング素材の周方向にて、前記内外周圧下直前領域の加熱体配置空間の長さが前記外周側誘導加熱体の長さの半分よりも大きくなっており、前記外周側誘導加熱体の中心が前記内外周圧下直前領域内に位置する、請求項3に記載のリング圧延体の製造方法。 - 前記圧延装置が、前記リング素材をその周方向に回転させた状態で前記リング素材の軸線方向の両端面にそれぞれ接触すると共に該リング素材を前記リング素材の軸線方向にて圧下するように構成され、かつ前記主ロールに対して前記リング素材の周方向に間隔を空けて配置される一対の回転可能なアキシャルロールをさらに備え、
前記圧延装置が、前記リング素材の外周側にて、前記一対のアキシャルロールから前記リング素材の回転方向側に向かって前記主ロールに至る範囲に配置されると共に前記リング素材に接触可能に構成された回転可能なガイドロールをさらに備え、
さらに、前記外周側誘導加熱体が、前記主ロールと前記ガイドロールとの間に位置する、請求項1に記載のリング圧延体の製造方法。 - 前記外周側誘導加熱体が、周回するように巻かれた巻線を有する誘導加熱コイルを含み、
前記リング素材の外周面における前記リング素材の軸線方向の両端部が、前記誘導加熱コイルにおける前記リング素材の軸線方向の両端部に挟まれる範囲内に配置される、請求項1に記載のリング圧延体の製造方法。 - 前記リング素材が、その外周側領域に形成されると共に前記リング素材の周方向に延びる凸部分を有し、
前記外周側誘導加熱体が、周回するように巻かれた巻線を有する誘導加熱コイルを含み、
前記凸部分における前記リング素材の軸線方向の両端部が、前記誘導加熱コイルにおける前記リング素材の軸線方向の両端部に挟まれる範囲内に配置される、請求項1に記載のリング圧延体の製造方法。 - 前記少なくとも1つの誘導加熱体が、前記リング素材の内周側領域を誘導加熱するように前記リング素材の内周側に配置される内周側誘導加熱体をさらに含み、
前記外周側誘導加熱体により誘導加熱される前記リング素材の外周側領域の温度が、前記内周側誘導加熱体により誘導加熱される前記リング素材の内周側領域の温度よりも高くなるように設定される、請求項1に記載のリング圧延体の製造方法。 - リング素材をその周方向に回転させた状態で前記リング素材の内外周面にそれぞれ接触すると共に前記リング素材をその径方向にて圧下するように構成される回転可能なマンドレルロール及び主ロールと、周回するように巻かれた巻線を有すると共に前記リング素材を誘導加熱するように構成される少なくとも1つの誘導加熱コイルとを用いて、前記リング素材からリング圧延体を形作るリング圧延体の製造方法であって、
前記誘導加熱コイルの外周縁部分が、前記リング素材の周方向又は軸線方向に対して傾いた方向に沿って配置された少なくとも1つの傾斜部を有する、リング圧延体の製造方法。 - リング素材をその周方向に回転させた状態で前記リング素材の内外周面にそれぞれ接触すると共に前記リング素材をその径方向にて圧下するように構成される回転可能なマンドレルロール及び主ロールと、周回するように巻かれた巻線を有すると共に前記リング素材を誘導加熱するように構成される少なくとも1つの誘導加熱コイルとを用いて、前記リング素材からリング圧延体を形作るリング圧延体の製造方法であって、
前記リング素材の周方向又は軸線方向に対する前記誘導加熱コイルの傾斜を変化可能とするように構成される機構を用いて、前記誘導加熱コイルの外周縁部分を前記リング素材の周方向又は軸線方向に対して傾斜させるリング圧延体の製造方法。
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