WO2014024907A1 - Method for manufacturing wheel rim for wheel - Google Patents
Method for manufacturing wheel rim for wheel Download PDFInfo
- Publication number
- WO2014024907A1 WO2014024907A1 PCT/JP2013/071327 JP2013071327W WO2014024907A1 WO 2014024907 A1 WO2014024907 A1 WO 2014024907A1 JP 2013071327 W JP2013071327 W JP 2013071327W WO 2014024907 A1 WO2014024907 A1 WO 2014024907A1
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- WIPO (PCT)
- Prior art keywords
- rim
- ring
- manufacturing
- mold
- diameter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/26—Making other particular articles wheels or the like
- B21D53/30—Making other particular articles wheels or the like wheel rims
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B21/00—Rims
- B60B21/02—Rims characterised by transverse section
Definitions
- the present invention relates to a method for manufacturing a vehicle wheel rim, and more particularly, to a method for manufacturing a vehicle wheel rim that manufactures a vehicle wheel rim from a ring.
- Patent Document 1 discloses a method of manufacturing a wheel in which a rim 6 and a disk 7 are integrated as shown in FIG.
- Patent Document 1 discloses a method of forming the rim 6 by press using an outer peripheral die 8a and an inner peripheral die 8b.
- the method for manufacturing a vehicle wheel rim disclosed in the above publication has the following problems. Since the rim 6 and the disk 7 are integrated, it is necessary to use a circular flat plate. Therefore, a rectangular flat plate cannot be used as it is, and there is a waste of material. In addition, since a circular flat plate is drawn into a rim portion, a large deformation process has already been applied before the rim portion is pressed. It is difficult to form a high-quality rim portion by press molding the rim portion.
- An object of the present invention is to provide a method for manufacturing a vehicle wheel rim capable of suppressing the generation of waste of material.
- the present invention for achieving the above object is as follows.
- An elemental ring preparation step in which a rectangular steel plate is wound into a cylindrical shape and both ends of the winding are welded to each other to form an elemental ring;
- An outer peripheral mold divided in the circumferential direction and an inner peripheral mold are moved with respect to the elemental ring to reduce the diameter of the elemental ring by the outer peripheral mold and the diameter expansion of the elemental ring by the inner peripheral mold.
- a rim forming step performed by pressing, simultaneously performing the rim into a rim shape;
- a method for manufacturing a vehicle wheel rim comprising: (2) The vehicle rim manufacturing method according to (1), wherein the rim forming step includes at least one rough forming step and a finishing step.
- the base ring is reduced in diameter to form a drop bottom surface portion of the wheel rim and at least a part of the first and second sidewall portions
- the diameter of the elemental ring is reduced, and the end part of the first sidewall part opposite to the drop bottom part in the axial direction of the elemental ring and the second sidewall part
- the vehicle wheel rim manufacturing method of the above (1) the following effects can be obtained. Since the rim forming process is performed by pressing, the rim can be formed by using an outer peripheral mold and an inner peripheral mold of a general-purpose press. In addition, since a rectangular steel sheet is wound into a cylindrical shape, and both ends of the winding are welded to each other to form an element ring, and a rim forming step for making the element ring into a rim shape, A rim can be produced using a flat plate. Therefore, since it is not necessary to use a circular flat plate, it is possible to suppress the generation of waste of materials and to easily form a rim as compared to the case of using a circular flat plate.
- the rim forming step includes at least one rough forming step and a finishing step, a rim with good quality can be formed.
- each of the movement speed and stroke of the outer peripheral mold and each of the movement speed and stroke of the inner peripheral mold are adjusted so that the occurrence of shrinkage, wrinkles, etc. is suppressed and accuracy is improved.
- the rim can be molded well.
- the maximum value of the amount of expansion of the elemental ring is larger than the maximum value of the amount of diameter reduction of the elemental ring. Rims with good quality can be formed.
- the rough forming step includes a step of forming the recess by reducing the diameter of the elemental ring, it is possible to efficiently form a rim with higher efficiency and better quality.
- FIG. 1 shows the state before the rough forming process of a rim forming process.
- B shows the state after the rough forming step of the rim forming step.
- C shows the state before the finishing process of a rim forming process.
- D shows the state after the finishing process of a rim forming process.
- FIG. 10 is a half cross-sectional view of a modified example of the rough forming ring after the rough forming step in the vehicle wheel rim manufacturing method of the embodiment of the present invention. It is a half sectional view of the rim manufactured by the manufacturing method of the wheel rim for vehicles of the example of the present invention.
- both the outer rim type and the inner rim type are circumferential division types, and the phases of the outer rim type and the inner rim type coincide with each other.
- FIG. For the sake of clarity, the cross-sectional display of parts other than the elemental ring is omitted.
- both the outer periphery type and the inner periphery type are circumferentially divided types, and the phases of the outer periphery type and the inner periphery type are different. It is sectional drawing in the case. For the sake of clarity, the cross-sectional display of parts other than the elemental ring is omitted.
- both the outer periphery type and the inner periphery type are circumferential division types, and the number of divisions of the outer periphery type and the inner periphery type is different.
- FIG. For the sake of clarity, the cross-sectional display of parts other than the elemental ring is omitted. It is a fragmentary sectional view of the press machine used for the manufacturing method of the wheel rim for vehicles of the example of the present invention in the state where the press machine was operated and the outer periphery type and the inner periphery type were reduced.
- the cross-sectional display of parts other than the elemental ring is omitted. It is sectional drawing when both the outer periphery type
- the cross-sectional display of parts other than the elemental ring is omitted. It is sectional drawing in case the radial direction retreat part is provided in the inner periphery type in the outer periphery type
- the cross-sectional display of parts other than the elemental ring is omitted. It is sectional drawing when the radial direction retraction part is provided in each of the outer periphery type
- the vehicle wheel rim (hereinafter also simply referred to as a rim) 30 is a method of manufacturing the rim 30 from the element ring 20 as shown in FIGS.
- the material of the element ring 20 is steel.
- the rim 30 is, for example, a rim for passenger cars, trucks / buses, and industrial vehicles.
- the rim 30 has a first flange portion 30a, a first bead sheet portion 30b, a hump portion 30h, a drop portion 30d (the drop portion 30d A first side wall portion 30c, a drop bottom surface portion 30d1, and a second side wall portion 30e), a second bead sheet portion 30f, and a second flange portion 30g.
- a disc (not shown) is fitted into the rim and welded to form a welding type wheel.
- the rim 30 does not have one of the first flange portion 30a or the second flange portion 30g, and is a full-face wheel that is joined to the back surface of a disk (not shown) with a bead seat portion.
- a rim may be used.
- the manufacturing method of the rim 30 includes a ring manufacturing step in which a rectangular steel plate 10 is wound into a cylindrical shape and both ends of the winding are welded together to form a ring 20. 2, the outer peripheral mold 41 and the inner peripheral mold 42 divided in the circumferential direction are moved with respect to the main ring 20 (rough forming ring 40), and the main ring 20 ( This is performed by a press which reduces the diameter of the rough forming ring 40) and expands the diameter of the element ring 20 (rough forming ring 40) by the inner peripheral die 42, and makes the element ring 20 (rough forming ring 40) into the shape of the rim 30.
- a rim forming step is performed by a press which reduces the diameter of the rough forming ring 40) and expands the diameter of the element ring 20 (rough forming ring 40) by the inner peripheral die 42, and makes the element ring 20 (rough forming ring 40) into the shape of the rim 30.
- the diameter reduction of the elemental ring 20 (rough forming ring 40) by the outer peripheral mold 41 and the diameter expansion of the elemental ring 20 (rough forming ring 40) by the inner peripheral mold 42 are simultaneously performed on the elemental ring 20 (rough forming ring 40). It is performed all around. Further, the diameter reduction of the elemental ring 20 (rough forming ring 40) by the outer peripheral mold 41 and the diameter expansion of the elemental ring 20 (rough forming ring 40) by the inner peripheral mold 42 may be performed simultaneously (in the same process). .
- the maximum inner diameter of the outer peripheral mold 41 when the outer peripheral mold 41 is expanded most is larger than the maximum outer diameter of the rim 30 so that the outer peripheral mold 41 can be removed from the rim 30. Further, the maximum outer diameter of the inner peripheral mold 42 when the inner peripheral mold 42 is most contracted is smaller than the maximum inner diameter of the rim 30 so that the inner peripheral mold can be removed from the rim 30.
- a flat rectangular steel plate 10 is obtained by, for example, pulling the belt-like member 11 linearly from the belt-like member 11 wound in a coil shape for each predetermined length. It is produced sequentially by cutting.
- the flat rectangular steel plate 10 is wound into a cylindrical shape, both ends of the winding are butted against each other and welded together by flash butt welding, butt welding, arc welding, or the like, and the rise and burrs of the welded portion 12 are trimmed.
- the element ring 20 is produced.
- the elemental ring production step although not shown, the elemental ring 20 may be produced by cutting a pipe-shaped material into a predetermined length.
- Rim forming process is performed by pressing.
- the blank 20 is set in the press machine 50 as shown in FIG. Thereafter, the press machine 50 is operated to move (crush) the outer peripheral die 41 and the inner peripheral die 42 with respect to the elemental ring 20, and the elemental ring 20 is formed into a rim shape.
- the drop portion 30 d of the rim 30 is formed by reducing the diameter of the element ring 20.
- the first flange portion 30 a and the second flange portion 30 g of the rim 30 are formed by expanding the diameter of the element ring 20.
- the outer peripheral mold 41 is a circumferentially divided mold that is divided in the circumferential direction.
- the outer peripheral die 41 is disposed on the outer side in the radial direction (hereinafter also simply referred to as the radial direction) of the element ring 20 (rough forming ring 40).
- the outer peripheral die 41 moves (reduces diameter) in the radial direction with respect to the element ring 20 (rough forming ring 40), thereby reducing the diameter of the element ring 20 (rough forming ring 40).
- the inner circumferential mold 42 is a circumferential division mold divided in the circumferential direction.
- the inner peripheral mold 42 is arranged on the inner side in the radial direction of the element ring 20 (rough forming ring 40).
- the inner peripheral die 42 moves (expands) in the radial direction of the elemental ring 20 (roughly formed ring 40) with respect to the elemental ring 20 (roughly formed ring 40). Expand the diameter.
- the inner peripheral die 42 includes a portion having a diameter larger than that of the elemental ring 20 (roughly formed ring 40).
- the inner peripheral mold 42 may be an axial press die that moves (rolls and presses) in the axial direction of the element ring 20 (rough forming ring 40) to expand the diameter of the element ring 20 (rough forming ring 40).
- the inner peripheral mold 42 may or may not be divided in the circumferential direction, but is divided only in the axial direction and divided in the circumferential direction. It is better not to.
- the inner circumference type is a circumferential division type
- the number of divisions in the circumferential direction of the outer periphery die 41 and the inner periphery die 42 may be the same as shown in FIGS. 7 and 8, or may be different as shown in FIG.
- the number of divisions of the outer periphery mold 41 and the inner periphery mold 42 may be larger or smaller than the number of divisions of the inner periphery mold 42.
- mold 42 may correspond as shown in FIG. 7, and may differ as shown in FIG.
- the movement (reduction diameter) speed and movement distance of the outer peripheral mold 41 and the movement (expansion) speed and movement distance of the inner peripheral mold 42 are adjusted, respectively.
- the diameter reduction speed and the moving distance of the outer peripheral mold 41 are configured to be changeable. Further, the diameter expansion speed and the moving distance of the inner peripheral mold 42 can be changed.
- the moving speed of the outer peripheral mold 41 may be the same as or different from the moving speed of the inner peripheral mold 42.
- the movement distance of the outer peripheral mold 41 may be the same as or different from the movement distance of the inner peripheral mold 42.
- the moving speed of the outer peripheral mold 41 and the inner peripheral mold 42 may be always constant from the start of molding to the end of molding.
- the molding start is made faster than the latter half of molding. It is desirable.
- the movement speed of the outer peripheral mold 41 and the inner peripheral mold 42 may be faster in the latter half of the molding than in the first half of the molding, but since the molding requires less force than the latter half of the molding. It is desirable that the beginning of molding be faster than the latter half of molding.
- the maximum value of the diameter expansion of the element ring 20 is set larger than the maximum value of the diameter reduction of the element ring 20. This is to suppress the occurrence of buckling in the reduced diameter portion and its vicinity due to the reduced diameter.
- the diameter reduction rate from the elemental ring 20 is about 5% or within 5% in the most diameter-reduced part, and the diameter expansion rate from the elemental ring 20 is about 10% or more than 10% in the most diameter-expanded part. It is desirable that Further, it is desirable that the ratio of the diameter expansion ratio to the diameter reduction ratio from the element ring 20 is 1: 2.8 or more.
- the outer peripheral die 41 is integrated over the entire length in the axial direction (hereinafter also simply referred to as the axial direction) of the element ring 20 (rough forming ring 40).
- the outer peripheral mold 41 may be a split mold (axial split mold) that is split into at least two in the axial direction.
- the number of divisions in the axial direction of the outer peripheral mold 41 may be two, three, or four or more.
- segmented into 3 pieces is shown.
- type 41 is an axial direction division
- the inner circumferential mold 42 may be integrated over the entire length in the axial direction, or may be a divided mold (axially divided mold) divided into at least two.
- the number of divisions in the axial direction of the inner peripheral mold 42 may be two, three, or four or more. In the illustrated example of the present invention, the inner peripheral mold 42 is divided into two parts.
- the moving speed and moving distance in the radial direction of each mold in the axial direction may be different from each other.
- the outer peripheral mold 41 when the number of divisions in the axial direction of the outer peripheral mold 41 is three and the number of divisions in the axial direction of the inner peripheral mold 42 is two, the outer peripheral mold 41 has the other end in the axial direction.
- the first, second, and third outer molds 41a, 41b, and 41c are provided in this order.
- the inner peripheral mold 42 includes first and second inner molds 42a and 42b in order from one axial end to the other end.
- the rim forming step includes the following configuration.
- first and third outer molds 41a and 41c and / or the first and second inner molds 42a and 42b are moved with respect to the element ring 20, and the first and third outer molds 41a and 41c The axially opposite ends 21 and 21 of the element ring 20 are sandwiched between the first and second inner molds 42a and 42b.
- the second outer mold 41b is formed with the first and second outer molds 41a and 41c and the first and second inner molds 42a and 42b sandwiching the axial ends 21 and 21 of the element ring 20. Is moved (reduced in diameter) relative to the elemental ring 20 to reduce the diameter of the part of the elemental ring 20 that becomes the drop portion 30d of the rim 30.
- the first and second inner molds 42a and 42b are moved (expanded) with respect to the element ring 20 to form at least the first flange part 10a and the second flange part 10g of the rim 30. Increase the diameter of the part.
- the diameter reduction of the part of the element ring 20 that becomes the drop part 30d and the diameter expansion of the part of the element ring 20 that becomes the first flange part 10a and the second flange part 10g may be performed simultaneously.
- At least one of the outer peripheral mold 41 and the inner peripheral mold 42 may be provided with a radially retracted portion 43 as shown in FIG.
- the retracted part 43 is provided in the inner peripheral mold 42, and the first flange part 10a and the second flange part
- the receding portion 43 is provided in the outer peripheral mold 41.
- FIG. 12 shows a case where the radially retracted portion 43 is provided only on the inner peripheral mold 42.
- the radial retreating portion 43 is formed on either the outer peripheral die 41 or the inner peripheral die 42 at the corresponding positions of the outer peripheral die 41 and the inner peripheral die 42 in the axial direction (the same position in the axial direction).
- the forming ring 40 In a state in which the forming ring 40) is pressed and formed by the outer peripheral die 41 and the inner peripheral die 42, the forming ring 40) is provided so as to recede in the direction away from the formed rough forming ring 40 and the formed rim 30 in the radial direction. As shown in FIG.
- a retreating portion 43 is provided in the radial direction on the inner peripheral mold 42 at a position corresponding to the portion of the element ring 20 that becomes the drop portion 30d, and the first flange portion 10a and the second flange portion 10g
- a receding portion 43 may be provided in the radial direction on the outer peripheral die 41 at a position corresponding to the portion of the element ring 20. It is possible to suppress an excessive load from being applied to both molds 41 and 42 by the radially retracted portion 43. Therefore, the molding force can be reduced.
- the press machine 50 includes a first wedge 51 arranged in a cylindrical shape for moving the outer peripheral die 41 in the radial direction, and a conical shape for moving the inner peripheral die 42 in the radial direction.
- the second wedge 52 is provided.
- the rim forming step includes at least one rough forming step (preliminary forming step) and one finishing step, as shown in FIG. FIG. 2 shows a case where the rim forming process includes only two processes, one rough forming process and one finishing process.
- the diameter of the elemental ring 20 portion that becomes the drop portion 30 d of the rim 30 is reduced, and the diameter of the other elemental ring 20 part is increased.
- the core ring 20 is reduced in diameter, and viewed from the axial direction of the core ring 20 on the side opposite to the drop bottom surface portion 30d1 of the first sidewall portion 30c.
- a recess 40a having a width (length) L smaller than a distance L ′ (see FIG. 6) between an end 30c1 and an end 30e1 on the opposite side of the drop bottom surface 30d1 of the second sidewall 30e. You may provide the process to shape
- the recess 40 a is continuously provided over the entire circumference of the rough forming ring 40. As shown in FIG.
- only one recess 40a may be provided in the axial direction of the rough forming ring 40, or two recesses 40a may be provided as shown in FIG. It may be provided above. In addition, it is preferable to provide two or more recesses 40a in order to suppress deformation of the molded product (rim 30).
- the width L of each recess 40a may be constant or different.
- the total sum of the widths L of the recesses 40a is set to be smaller than the interval L ′ (see FIG. 6).
- the rough forming step may include a step of forming a flare portion 40 b by flaring at least the portion of the element ring 20 that becomes the first and second flange portions 10 a and 10 g.
- the step of forming the flare portion 40b it is desirable that the first and second bead sheet portions 30b and 30f and the hoop portion 30h are also flare-processed. This is because the first and second bead sheet portions 30b and 30f and the hump portion 30h can be formed by reducing the diameter of the flare portion 40b in a step subsequent to the step of forming the flare portion 40b.
- the flare portion 40 b is continuously provided over the entire circumference of the rough forming ring 40.
- the step of forming the concave portion 40a forms the flare portion 40b. May be performed before the step of forming, may be performed after the step of forming the flare portion 40b, or may be performed simultaneously (in the same step) with the step of forming the flare portion 40b.
- the rough forming ring 40 after the rough forming is formed into a rim shape. 7 to 13, the structure and operation are the same in the rough forming process and the finishing process, although the mold shapes are different.
- the manufacturing method of the rim 30 according to the embodiment of the present invention may have a rim shaping step after the rim shaping step, as shown in FIG.
- the rim shaping process is a process for improving the roundness of the rim 30.
- the shaping mold 60 having the conical part 61 is moved in the axial direction of the rim 30, and at least a part of the rim 30 in the axial direction is pushed and expanded in the radial direction by the conical part 61 to shape the rim 30.
- the rim shaping step when the rim 30 is pushed out in the radial direction by the shaping die 60, at least a part of the rim 30 in the axial direction is radially reduced by a roll (not shown) arranged on the outer peripheral side of the rim 30.
- the rim 30 may be shaped. Further, instead of shaping by the shaping mold 60 or in addition to shaping by the shaping mold 60, the rim 30 may be shaped by roll forming at least one stage.
- the rim forming step is performed by pressing
- the rim can be formed by using a general-purpose press 50, the outer peripheral die 41, and the inner peripheral die 42.
- the rectangular steel plate 10 is wound into a cylindrical shape and both ends of the winding are welded to each other to form the elemental ring 20 and the rim forming step for making the elemental ring 20 into a rim shape
- the rim 30 can be manufactured using the flat plate. Therefore, since it is not necessary to use a circular flat plate, waste of material can be suppressed compared to the case of using a circular flat plate. Further, the rim 30 can be easily formed.
- the rim forming step includes at least one rough forming step and a finishing step, the rim 30 can be stably formed as compared with the case where the rough forming step is not provided.
- the rim 30 can be molded with high accuracy. Further, the rim 30 can be accurately formed by considering the phase and the number of divisions of the outer peripheral die 41 divided in the circumferential direction and the inner peripheral die 42 divided in the circumferential direction.
- each of the movement speed and stroke of the outer peripheral mold 41 and each of the movement speed and stroke of the inner peripheral mold 42 are adjusted, thereby suppressing the occurrence of shrinkage and wrinkles.
- the rim 30 can be molded with high accuracy.
- the maximum value of the diameter expansion of the element ring 20 is larger than the maximum value of the diameter reduction of the element ring 20, so that buckling occurs in the diameter-reduced portion of the element ring 20.
- the rim 30 with good quality can be molded.
- the roundness of the rim 30 can be improved.
- both the diameter expansion and the diameter reduction of the element ring 20 are performed, so that the element ring 20 is buckled, compared to the case where the element ring 20 is only expanded or only the diameter is reduced to form the rim 30.
- the occurrence of defects such as cracks and constriction can be suppressed.
- the rough forming step includes a step of forming the recess 40a by reducing the diameter of the element ring 20, the risk of buckling in the portion of the element ring 20 where the diameter is reduced can be greatly suppressed, and the quality can be improved more efficiently.
- a good rim 30 can be formed effectively.
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Abstract
Description
リム6とディスク7とが一体とされているため、円形平板を用いる必要がある。そのため、矩形の平板をそのまま用いることができず、材料の無駄がある。また、円形平板を絞り加工してリム部としているため、リム部をプレス加工する前の段階で、既に大きな変形加工が加えられており、特に素材が鋼板の場合には、加工硬化によりその後にリム部をプレス成形によって高品質なリム部を成形することは困難である。 However, the method for manufacturing a vehicle wheel rim disclosed in the above publication has the following problems.
Since the
(1) 矩形の鋼板を筒状に巻いて巻きの両端部を互いに溶接接合して素環を作製する素環作製工程と、
周方向に分割された外周型と、内周型と、を前記素環に対して移動させて、前記外周型による前記素環の縮径と前記内周型による前記素環の拡径とを同時に行い、前記素環をリム形状にする、プレスによって行なわれるリム成形工程と、
を有する、車両用ホイールリムの製造方法。
(2) 前記リム成形工程は、少なくとも1つの荒成形工程と、仕上げ工程と、を備える、(1)記載の車両用ホイールリムの製造方法。
(3) 前記リム成形工程では、前記外周型の移動速度および移動距離と、前記内周型の移動速度および移動距離とが、それぞれ調節されて行なわれる、(1)または(2)記載の車両用ホイールリムの製造方法。
(4) 前記リム成形工程では、前記素環の拡径の量の最大値が、前記素環の縮径の量の最大値より、大とされている、(1)~(3)のいずれか1つに記載の車両用ホイールリムの製造方法。
(5)前記リム成形工程では、前記素環を縮径させて、ホイールリムのドロップ底面部と、第1、第2のサイドウォール部の少なくとも一部とを成形しており、
前記荒成形工程は、前記素環を縮径させて、前記素環の軸方向で前記第1のサイドウォール部の前記ドロップ底面部とは反対側の端部と前記第2のサイドウォール部の前記ドロップ底面部とは反対側の端部との間隔よりも幅が小の凹部を成形する工程を備える、(2)記載の車両用ホイールリムの製造方法。 The present invention for achieving the above object is as follows.
(1) An elemental ring preparation step in which a rectangular steel plate is wound into a cylindrical shape and both ends of the winding are welded to each other to form an elemental ring;
An outer peripheral mold divided in the circumferential direction and an inner peripheral mold are moved with respect to the elemental ring to reduce the diameter of the elemental ring by the outer peripheral mold and the diameter expansion of the elemental ring by the inner peripheral mold. A rim forming step performed by pressing, simultaneously performing the rim into a rim shape;
A method for manufacturing a vehicle wheel rim, comprising:
(2) The vehicle rim manufacturing method according to (1), wherein the rim forming step includes at least one rough forming step and a finishing step.
(3) The vehicle according to (1) or (2), wherein in the rim forming step, the moving speed and moving distance of the outer peripheral mold and the moving speed and moving distance of the inner peripheral mold are adjusted respectively. Wheel rim manufacturing method.
(4) In any one of (1) to (3), in the rim forming step, the maximum value of the amount of diameter expansion of the elemental ring is greater than the maximum value of the amount of diameter reduction of the elemental ring. The manufacturing method of the wheel rim for vehicles as described in any one.
(5) In the rim forming step, the base ring is reduced in diameter to form a drop bottom surface portion of the wheel rim and at least a part of the first and second sidewall portions,
In the rough forming step, the diameter of the elemental ring is reduced, and the end part of the first sidewall part opposite to the drop bottom part in the axial direction of the elemental ring and the second sidewall part The manufacturing method of the wheel rim for vehicles as described in (2) provided with the process of shape | molding the recessed part whose width | variety is smaller than the space | interval with the edge part on the opposite side to the said drop bottom face part.
リム成形工程がプレスによって行なわれるため、汎用のプレス機の外周型と内周型を使用することでリムを成形できる。また、矩形の鋼板を筒状に巻いて巻きの両端部を互いに溶接接合して素環を作製する素環作製工程と、素環をリム形状にするリム成形工程と、を有するため、矩形の平板を用いてリムを作製できる。そのため、円形平板を用いる必要がないため、円形平板を用いる場合に比べて材料の無駄の発生を抑制できるとともにリムの成形が容易にできる。 According to the vehicle wheel rim manufacturing method of the above (1), the following effects can be obtained.
Since the rim forming process is performed by pressing, the rim can be formed by using an outer peripheral mold and an inner peripheral mold of a general-purpose press. In addition, since a rectangular steel sheet is wound into a cylindrical shape, and both ends of the winding are welded to each other to form an element ring, and a rim forming step for making the element ring into a rim shape, A rim can be produced using a flat plate. Therefore, since it is not necessary to use a circular flat plate, it is possible to suppress the generation of waste of materials and to easily form a rim as compared to the case of using a circular flat plate.
リム成形工程が、少なくとも1つの荒成形工程と、仕上げ工程と、を備えるため、品質が良いリムを成形できる。 According to the vehicle wheel rim manufacturing method of (2) above, the following effects can be obtained.
Since the rim forming step includes at least one rough forming step and a finishing step, a rim with good quality can be formed.
リム成形工程では、外周型の移動の速度とストロークのそれぞれと、内周型の移動の速度とストロークのそれぞれとが、調節されて行なわれるため、肉引け、皺などの発生を抑制して精度良くリムを成形できる。 According to the vehicle wheel rim manufacturing method of (3) above, the following effects can be obtained.
In the rim forming process, each of the movement speed and stroke of the outer peripheral mold and each of the movement speed and stroke of the inner peripheral mold are adjusted so that the occurrence of shrinkage, wrinkles, etc. is suppressed and accuracy is improved. The rim can be molded well.
リム成形工程では、素環の拡径の量の最大値が、素環の縮径の量の最大値より、大とされているため、素環の縮径される部分に座屈が生じるおそれを抑制でき、品質が良いリムを成形できる。 According to the vehicle wheel rim manufacturing method of the above (4), the following effects can be obtained.
In the rim forming process, the maximum value of the amount of expansion of the elemental ring is larger than the maximum value of the amount of diameter reduction of the elemental ring. Rims with good quality can be formed.
荒成形工程が、素環を縮径させて凹部を成形する工程を備えるため、一層効率よく、品質が良いリムを効果的に成形できる。 According to the vehicle wheel rim manufacturing method of (5) above, the following effects can be obtained.
Since the rough forming step includes a step of forming the recess by reducing the diameter of the elemental ring, it is possible to efficiently form a rim with higher efficiency and better quality.
本発明実施例の車両用ホイールリム(以下、単にリムともいう)30の製造方法は、図1、図2に示すように、素環20からリム30を製造する方法である。素環20の材料は鋼である。リム30は、たとえば、乗用車用、トラック・バス用、産業車両用のリムである。 A method for manufacturing a vehicle wheel rim according to an embodiment of the present invention will be described below with reference to FIGS.
The vehicle wheel rim (hereinafter also simply referred to as a rim) 30 according to the embodiment of the present invention is a method of manufacturing the
ただし、リム30は、図示はしないが、第1のフランジ部30aまたは第2のフランジ部30gのうち一方が存在せず、図示略のディスクの裏面にビードシート部で接合される、フルフェイスホイール用のリムであってもよい。 As shown in FIG. 6, the
However, although not shown, the
なお、素環作製工程では、図示はしないが、パイプ状素材を所定寸法長さに切断して素環20を作製してもよい。 In the elemental ring manufacturing step, as shown in FIG. 1, a flat
In the elemental ring production step, although not shown, the
ただし、内周型42は、図15の変形例に示すように、素環20(荒成形環40)よりも径が大きい部分を備えており、素環20(荒成形環40)に対して素環20(荒成形環40)の軸方向に移動(圧下、プレス)されて素環20(荒成形環40)を拡径させる軸方向プレス型となっていてもよい。内周型42が軸方向プレス型となっている場合、内周型42は、周方向に分割されていてもよく分割されていなくてもよいが、軸方向にのみ分割され周方向に分割されていないほうが良い。
以下、本発明実施例では、内周型が円周分割型である場合を説明する。 The inner
However, as shown in the modified example of FIG. 15, the inner
Hereinafter, in the embodiment of the present invention, a case where the inner circumference type is a circumferential division type will be described.
外周型41の縮径速度および移動距離は、変更可能に構成されている。また、内周型42の拡径速度および移動距離も、変更可能に構成されている。外周型41の移動速度は、内周型42の移動速度と同じであってもよく、異なっていてもよい。外周型41の移動距離は、内周型42の移動距離と同じであってもよく、異なっていてもよい。
外周型41と内周型42の移動速度は、成形し始めから成形終了まで常に一定とされていてもよいが、成形時間短縮のために、成形し始めの方が成形後半よりも速くされていることが望ましい。外周型41と内周型42の移動速度が、成形後半の方が成形し始めよりも速くされていてもよいが、成形し始めの方が成形後半よりも成形に要する力が小さくて済むため、成形し始めの方が成形後半よりも速くされていることが望ましい。 In the rim forming step, the movement (reduction diameter) speed and movement distance of the outer
The diameter reduction speed and the moving distance of the outer
The moving speed of the outer
また、外周型41の軸方向における分割数が3個であり、内周型42の軸方向における分割数が2個である場合、リム成形工程は、以下の構成を含む。
先ず、第1、第3の外型41a、41cおよび/または第1、第2の内型42a、42bを素環20に対して移動させて、第1、第3の外型41a、41cと第1、第2の内型42a、42bとで素環20の軸方向両端部21,21を挟む。
次いで、第1、第3の外型41a、41cと第1、第2の内型42a、42bとで素環20の軸方向両端部21,21を挟んだ状態で、第2の外型41bを素環20に対して移動(縮径)させてリム30のドロップ部30dとなる素環20の部分を縮径させる。
次いで、第1、第2の内型42a、42bを素環20に対して移動(拡径)させて少なくともリム30の第1のフランジ部10aおよび第2のフランジ部10gとなる素環20の部分を拡径させる。ドロップ部30dとなる素環20の部分の縮径と、第1のフランジ部10aおよび第2のフランジ部10gとなる素環20の部分の拡径とは、同時に行われてもよい。 As shown in FIG. 11, when the number of divisions in the axial direction of the outer
Further, when the number of divisions in the axial direction of the outer peripheral die 41 is three and the number of divisions in the axial direction of the inner
First, the first and third
Next, the second
Next, the first and second
半径方向後退部43は、軸方向において外周型41と内周型42の対応する位置(軸方向に同じ位置)において外周型41と内周型42のうちいずれか一方に、素環20(荒成形環40)を外周型41および内周型42によりプレスして成形した状態で、成形された荒成形環40および成型されたリム30から半径方向に離れる方向に後退して設けられている。図13に示すようにドロップ部30dとなる素環20の部分に対応する位置の内周型42に半径方向に後退部43が設けられ、第1のフランジ部10aおよび第2のフランジ部10gとなる素環20の部分に対応する位置の外周型41に半径方向に後退部43が設けられていてもよい。半径方向後退部43により、両方の型41,42に過大な負荷がかかることを抑制できる。よって、成形力を低減できる。 At least one of the outer
The
凹部40aが複数設けられる場合、各凹部40aの幅Lは、一定であってもよく、異なっていてもよい。また、凹部40aが複数設けられる場合、各凹部40aの幅Lの総和は、間隔L´(図6参照)より小とされている。 In the rough forming step, as shown in FIGS. 3 and 4, the
When a plurality of the
リム整形工程では、円錐部61をもつ整形型60をリム30の軸方向に移動させて、円錐部61にてリム30の少なくとも軸方向一部を半径方向に押し広げてリム30を整形する。リム整形工程では、図示略のタイヤが装着される部分である第1のビードシート部30bおよび第2のビードシート部30fを半径方向に押し広げることが望ましい。
リム整形工程では、整形型60によりリム30を半径方向に押し広げるとき、リム30の外周側に配置される図示略のロールにてリム30の少なくとも軸方向一部を半径方向に縮径させてリム30を整形してもよい。また、整形型60による整形の替わりに、または、整形型60による整形に加えて、少なくとも1段のロール成形をしてリム30の整形をしてもよい。 The manufacturing method of the
In the rim shaping step, the shaping
In the rim shaping step, when the
リム成形工程がプレスによって行なわれるため、汎用のプレス機50と外周型41と内周型42を使用することでリムを成形できる。 Next, the operation of the embodiment of the present invention will be described.
Since the rim forming step is performed by pressing, the rim can be formed by using a general-
また、周方向に分割された外周型41と周方向に分割された内周型42の、位相と分割数を考慮することで、リム30を精度よく成形できる。 By using the outer peripheral die 41 divided in the circumferential direction and the inner peripheral die 42 divided in the circumferential direction, the
Further, the
11 帯状部材
12 溶接部
20 素環
30 リム
30a 第1のフランジ部
30b 第1のビードシート部
30c 第1のサイドウォール部
30d ドロップ部
30d1 ドロップ底面部
30e 第2のサイドウォール部
30f 第2のビードシート部
30g 第2のフランジ部
30h ハンプ部
40 荒成形環
40a 凹部
40b フレア部
41 外周型
42 内周型
43 半径方向後退部
50 プレス機
51 第1の楔
52 第2の楔
60 整形型
61 円錐部 DESCRIPTION OF
Claims (5)
- 矩形の鋼板を筒状に巻いて巻きの両端部を互いに溶接接合して素環を作製する素環作製工程と、
周方向に分割された外周型と、内周型と、を前記素環に対して移動させて、前記外周型による前記素環の縮径と前記内周型による前記素環の拡径とを行い、前記素環をリム形状にする、プレスによって行なわれるリム成形工程と、
を有する、車両用ホイールリムの製造方法。 An element manufacturing process for manufacturing an elemental ring by winding a rectangular steel plate into a cylindrical shape and welding both ends of the winding to each other;
An outer peripheral mold divided in the circumferential direction and an inner peripheral mold are moved with respect to the elemental ring to reduce the diameter of the elemental ring by the outer peripheral mold and the diameter expansion of the elemental ring by the inner peripheral mold. A rim forming step performed by pressing, wherein the element ring is formed into a rim shape;
A method for manufacturing a vehicle wheel rim, comprising: - 前記リム成形工程は、少なくとも1つの荒成形工程と、仕上げ工程と、を備える、請求項1記載の車両用ホイールリムの製造方法。 The vehicle rim manufacturing method according to claim 1, wherein the rim forming step includes at least one rough forming step and a finishing step.
- 前記リム成形工程では、前記外周型の移動速度および移動距離と、前記内周型の移動速度および移動距離とが、それぞれ調節されて行なわれる、請求項1または請求項2記載の車両用ホイールリムの製造方法。 3. The vehicle wheel rim according to claim 1, wherein in the rim forming step, the movement speed and movement distance of the outer peripheral mold and the movement speed and movement distance of the inner peripheral mold are adjusted respectively. Manufacturing method.
- 前記リム成形工程では、前記素環の拡径の量の最大値が、前記素環の縮径の量の最大値より、大とされている、請求項1~3のいずれか1項に記載の車両用ホイールリムの製造方法。 4. The rim forming step according to claim 1, wherein the maximum value of the amount of expansion of the elemental ring is larger than the maximum value of the amount of diameter reduction of the elemental ring. Manufacturing method for vehicle wheel rim.
- 前記リム成形工程では、前記素環を縮径させて、ホイールリムのドロップ底面部と、第1、第2のサイドウォール部の少なくとも一部とを成形しており、
前記荒成形工程は、前記素環を縮径させて、前記素環の軸方向で前記第1のサイドウォール部の前記ドロップ底面部とは反対側の端部と前記第2のサイドウォール部の前記ドロップ底面部とは反対側の端部との間隔よりも幅が小の凹部を成形する工程を備える、請求項2記載の車両用ホイールリムの製造方法。 In the rim forming step, the base ring is reduced in diameter to form a drop bottom surface portion of the wheel rim and at least a part of the first and second sidewall portions,
In the rough forming step, the diameter of the elemental ring is reduced, and the end part of the first sidewall part opposite to the drop bottom part in the axial direction of the elemental ring and the second sidewall part The manufacturing method of the wheel rim for vehicles of Claim 2 provided with the process of shape | molding a recessed part with a width | variety smaller than the space | interval with the edge part on the opposite side to the said drop bottom face part.
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WO2019201722A1 (en) * | 2018-04-17 | 2019-10-24 | Thyssenkrupp Steel Europe Ag | Method and device for producing a producing a wheel rim |
CN110712381A (en) * | 2019-11-22 | 2020-01-21 | 吉林大学 | Carbon fiber composite rim forming die |
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CN110405092A (en) * | 2019-07-27 | 2019-11-05 | 安徽科技学院 | A kind of rim for automobile wheel angle flaring die |
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