JP6472882B2 - Burring method and burring system - Google Patents

Description

  The present invention relates to a press member, a burring method and a burring system for manufacturing the press member.

  Conventionally, burring is known as a method of manufacturing a press member in which a rising portion is formed around a through hole. For example, Patent Literature 1 discloses a technique related to this type of burring. Patent Document 1 discloses a pre-forming step in which a convex portion is formed in the rising direction of the rising portion at a portion where the burring of the plate material is to be performed by pressing, and a convex portion formed in the pre-forming step by punching processing. And a punching step of making a hole having a diameter smaller than the diameter of the hole finally obtained, and a main forming step of forming a raised portion by deep drawing a convex portion having a hole by pressing. A characteristic burring method for a plate material is disclosed.

Japanese Patent Laid-Open No. 2004-223583

  Flatness may be required around the through hole in the press member. For example, when the packing member is attached around the through hole, the portion of the press member to which the packing member is attached needs to be formed flat. However, in the molding using the conventional burring process, there is a problem that undulation is formed around the through hole by punching or pressing during the burring process. If undulation occurs in the portion where the packing is attached, a gap is formed between the packing member and the press member, and the sealing performance is deteriorated. In this regard, even in the technique disclosed in Patent Document 1, the bent portion of the convex portion formed in the preforming process becomes a fold after punching or pressing, and a undulating portion is formed. It was difficult to ensure flatness.

  An object of this invention is to provide the technique regarding the burring process which can form a favorable flat part around a through-hole in the press member in which a standing part is formed around a through-hole.

  The present invention relates to a burring method for manufacturing a press member (for example, a press member 10 described later) in which a rising portion (for example, a later-described rising portion 13) is formed around a through hole (for example, a later-described through hole 12). Then, a portion where the through-hole is formed (for example, a portion 49 where a later-described through-hole is formed) protrudes in a tapered shape in which an inclined portion (for example, an inclined portion 50 described later) is formed around. A preforming step, a punching step for forming the through-hole, a portion of the press member around the through-hole and a part of the inclined portion on the through-hole side are formed on the rising portion, and the remaining of the inclined portion And a main forming step of forming a flat portion (for example, a packing mounting surface 14 described later) around the rising portion from the portion.

  As a result, a part of the inclined portion formed in the pre-forming process is formed into a flat portion by the main forming, so that a crease (for example, a wavy portion 19 described later) is formed in the flat portion in the main forming process. Can be prevented.

  In the pre-forming step, a portion formed in the flat portion is formed into a starting point portion (for example, an outer end portion 51 described later) and a rising portion that start to tilt toward the portion where the through hole is formed. It is preferable to shape the inclined portion so as to be positioned between the two portions.

  Thereby, it is possible to more reliably prevent a situation in which creases caused by the starting portion of the inclined portion occur in the flat portion. Moreover, the press member in which the crease is located outside the flat portion can be easily formed only by setting the position of the starting portion based on the required shape of the flat portion.

  In the main forming step, it is preferable that the rising portion is formed by applying a pressing force to the inclined portion so as to be pulled toward the through hole while holding the vicinity of the starting point portion.

  As a result, the press member is pulled toward the through-hole while being pressed on the starting portion side, so that a high-quality press member with sufficiently flatness can be manufactured.

  In addition, the present invention provides a burring for producing a press member (for example, a press member 10 described later) in which a rising portion (for example, a later-described rising portion 13) is formed around a through hole (for example, a later-described through hole 12). In a processing system (for example, a burring processing system 20 to be described later), a portion where the through-hole is formed (for example, a portion 49 where a through-hole to be described later is formed) is tapered so that an inclined portion is formed around the portion. And a punching device (for example, a burring device 40 to be described later) for forming the through hole, and the periphery of the through hole and the inclination in the press member. A part on the through hole side in the portion is formed into the rising portion, and a flat portion around the rising portion from the remaining portion of the inclined portion ( Eg to the present molding apparatus for molding a gasket mounting surface 14) will be described later (for example, burring apparatus 40 will be described later), related to burring processing system comprising a.

  Thereby, since a part of inclined part shape | molded by a preforming apparatus is shape | molded by this shaping | molding apparatus in a flat part, the situation where a fold is formed in the flat part of a press member can be prevented.

  The preforming device is formed into a starting portion (for example, an outer end portion 51 described later) and a rising portion where a portion formed in the flat portion starts to tilt toward a portion where the through hole is formed. The inclined portion is formed so as to be positioned between the two portions. The molding apparatus includes a mold body (for example, a lower mold 41 described later), a button die (for example, a button die 42 described later) provided on the mold body, and a burring punch (for example, a mold for forming the rising portion). , A burring punch 44 to be described later, and a pad (for example, a pad 43 to be described later) that presses the outside of the starting portion in the inclined portion, the pad and the die main body of the starting portion of the press member It is preferable to press the through hole side of the pressing member with the burring punch while pressing the outside.

  Thereby, it is possible to more reliably prevent a situation in which creases caused by the starting portion of the inclined portion occur in the flat portion. Moreover, the press member in which the crease is located outside the flat portion can be easily formed only by setting the position of the starting portion based on the required shape of the flat portion. In addition, since the press member is pulled toward the through hole while being pressed on the outside of the starting portion, a high-quality press member with sufficiently flatness can be manufactured.

  The punching device (for example, piercing punch 45 and button die 42 described later) and the main forming apparatus (for example, burring punch 44 and button die 42 described later) are the same press device (for example, burring processing device 40 described later). It is preferable to be mounted on.

  Thereby, the formation of the through hole and the operation for forming the rising portion can be performed by one press device, the burring time is shortened, and the space required for arranging the punching device and the main forming device Can be miniaturized.

  The present invention also includes a through hole (for example, a through hole 12 described later) to which a fuel pump (for example, a fuel pump 90 described later) is attached and a rising portion (for example, a rising portion described later) formed around the through hole. 13) a pressing member (for example, a pressing member 10 to be described later), a packing mounting surface (for example, a packing mounting surface to be described later) formed flat around the through hole and the rising portion, and the packing A swell portion (for example, a swell portion 19 described later) that is the same surface as the mounting surface and is formed on the outer side of the packing mounting surface, and a packing member (for example, a packing that is described later) on the packing mounting surface. The invention relates to a pressing member to which the fuel pump is attached via a member 91).

  As a result, the swell portion generated during the burring process is positioned outside the packing mounting surface, so that it is possible to reliably prevent the swell portion from forming a gap between the packing member and the press member. it can.

  According to the burring process of the present invention, a good flat portion can be formed around the through hole in the press member in which the rising portion is formed around the through hole.

It is a perspective view which shows the press member which concerns on one Embodiment of this invention. It is an expansion perspective view which shows the mode of the through-hole vicinity in the surface of a press member. It is an expansion perspective view which shows the mode of the through-hole vicinity in the back surface of a press member. It is sectional drawing which shows typically the mode of the through-hole vicinity of a press member. It is a figure which shows typically a mode that the overdraw shape was shape | molded by the press member. It is a figure which shows typically a mode that a press member is inserted | pinched with a lower mold | type and a pad. It is a figure which shows typically a mode that a press member is pressed by a burring punch. It is a figure which shows typically a mode that the through-hole was formed in the press member by the piercing punch. It is a figure which shows typically the mode of the press member in which a standing part is formed by a burring punch.

  Hereinafter, a preferred embodiment of a burring method for producing a press member of the present invention will be described with reference to the drawings. In the present embodiment, the bottom of the fuel tank of the motorcycle is manufactured as the press member 10.

  FIG. 1 is a perspective view showing a press member 10 according to an embodiment of the present invention. FIG. 2 is an enlarged perspective view showing a state in the vicinity of the through hole 12 on the surface 31 of the press member 10. FIG. 3 is an enlarged perspective view showing the vicinity of the through hole 12 on the back surface 32 of the press member 10. FIG. 4 is a cross-sectional view schematically showing the vicinity of the through hole 12 of the press member 10.

  As shown in FIGS. 1-4, the press member 10 is equipped with the base 11, the through-hole 12, the standing part 13, and the packing attachment surface 14 as main structures.

  The base 11 is a bottom plate of the fuel tank. A fuel tank body 15 is attached to the base 11. The base 11 of this embodiment has a protrusion 16 formed on the front side thereof.

  The through hole 12 is a planar portion of the base 11 and is formed on the rear side of the protrusion 16. A fuel pump 90 is attached through the through hole 12. Here, the front side and the rear side mean front and rear in the traveling direction of the motorcycle to which the fuel tank is attached.

  The rising portion 13 is formed around the through hole 12. As shown in FIGS. 2 and 4, the rising portion 13 is formed on the surface 31 and is formed in a wall shape covering the periphery of the through hole 12.

  The packing mounting surface 14 is formed around the through hole 12 in the back surface 32 of the base 11. A fuel pump 90 is attached to the packing attachment surface 14 with a packing member 91 interposed therebetween. The packing mounting surface 14 of the present embodiment is formed flat by burring processing of the present embodiment described later (for example, flatness 0.3).

  As shown in FIGS. 3 and 4, a swell portion 19 generated in the process of burring is formed on the outer side of the packing mounting surface 14 of the press member 10. In the following description, the inner side and the outer side are described with the through hole 12 side as the inner side and the end face side of the press member 10 as the outer side.

  The main structure of the press member 10 is as described above. Next, the burring method used for manufacture of the press member 10 of this embodiment is demonstrated. In the burring method of this embodiment, a draw process, a punching process, and a burring process are performed.

  The draw process is a preforming process for burring. FIG. 5 is a diagram schematically illustrating a state in which the overdraw shape is formed on the press member 10. In FIG. 5, the one side part of the press member 10a is expanded and represented typically.

  As shown in FIG. 5, the burring processing system 20 includes a draw molding device 21 as a preforming device. The draw molding device 21 forms an overdraw shape into a plate material made of a metal material by using the upper draw die 25 and the lower draw die 26, and manufactures the press member 10a. By this drawing process, the inclined portion 50 is formed in the press member 10a.

  The inclined portion 50 is formed in the entire area around the portion 49 where the through hole 12 is formed. Further, the inclined portion 50 is shaped such that the outer end portion 51 is at a lower position than the inner end portion 52. The outer end 51 of the inclined portion 50 is located outside the portion that becomes the packing mounting surface 14, and the inner end 52 is located outside the portion 49 where the through hole 12 is formed.

  The overdraw shape of the press member 10a is set based on the position of the portion 49 where the through hole 12 is formed, the height a of the rising portion 13, the width of the packing mounting surface 14 (width of the packing member 91), and the like. (See FIG. 4). In FIG. 4, the range of the distance b from the through hole 12 side is formed flat, and the width of the packing mounting surface 14 is a length included in the distance b. The length of the inclined portion 50 of the press member 10a can be set based on these distances and sizes.

  Next, punching and burring will be described. FIG. 6 is a diagram schematically showing a state in which the press member 10 a is sandwiched between the lower mold 41 and the pad 43. FIG. 7 is a diagram schematically showing a state in which the pressing member 10 b is pressed by the burring punch 44. FIG. 8 is a diagram schematically illustrating a state in which the through hole 12 is formed in the press member 10 c by the piercing punch 45. FIG. 9 is a diagram schematically showing a state of the press member 10 in which the rising portion 13 is formed by the burring punch 44. 6 to 9, the portion on one side of the press member 10 is enlarged and schematically represented.

  The burring system 20 according to the present embodiment includes a burring apparatus 40 as a main forming apparatus. The burring apparatus 40 is a press forming apparatus in which a punching apparatus that performs punching and a main forming apparatus that performs burring are mounted. The burring apparatus 40 of the present embodiment includes a lower die 41, a button die 42, a pad 43, a burring punch 44, and a piercing punch 45.

  As shown in FIG. 6, the lower die 41 incorporates a button die 42 in which a die hole 71 is formed. In the punching process, the press member 10 a formed with the overdraw shape is set on the lower die 41. The outer side of the outer end 51 in the press member 10 a is sandwiched between the pad 43 and the lower mold 41. The press member 10 is set so that the inner end 52 of the inclined portion 50 is positioned outside the die hole 71 of the button die 42.

  In the present embodiment, the inclined portion 50 has an overdraw shape in which the outer end portion 51 is located in the vicinity of the pad 43. Since the inclined portion 50 extends to the vicinity of the portion pressed by the pad 43, the portion sandwiched between the lower mold 41 and the pad 43 is in a state of being positioned in the vicinity of the outer end portion 51 in the press member 10.

  Next, as shown in FIG. 7, pressing by the burring punch 44 is applied to the press member 10 b set in the burring apparatus 40. In the present embodiment, the burring punch 44 is pushed downward around the portion 49 where the through hole 12 of the pressing member 10 is formed, and the vicinity of the inner end portion 52 of the inclined portion 50 is bent inward.

  Further, with the start of pressing by the burring punch 44, pressing by the piercing punch 45 is also started at the portion 49 where the through hole 12 is formed in the pressing member 10b. The piercing punch 45 is formed to have a diameter smaller than the diameter of the die hole 71 of the button die 42, and contacts the portion 49 where the through hole 12 is formed in the press member 10. The button die 42 has a blade formed around the die hole 71, and the piercing punch 45 has a blade formed at the end thereof.

  As shown in FIG. 8, the burring punch 44 is further moved downward, and the peripheral portion where the through hole 12 of the press member 10 is formed is bent so as to rise between the burring punch 44 and the button die 42. In parallel with the pressing of the burring punch 44, the piercing scrap 60 is cut out from the pressing member 10 by the piercing punch 45, and a portion to be the through hole 12 is formed.

  As shown in FIG. 9, the burring punch 44 pushes the through hole 12 side of the press member 10 further downward (lower mold 41 side), so that the portion of the inclined portion 50 on the through hole 12 side rises further. A rising portion 13 is formed around the through hole 12. As described above, since the overdraw shape is set so that the outer end portion 51 that causes the waviness portion 19 is outside the portion that becomes the packing mounting surface 14, the waviness portion 19 derived from the crease is It does not occur on the mounting surface 14.

  Further, in the process of forming the rising portion 13, the vicinity of the outer end portion 51 in the press member 10 is held by the pad 43 and the lower mold 41. Therefore, when the burring punch 44 pushes the inside of the press member 10 downward, a force that is pulled inwardly acts on the inclined portion 50 of the press member 10, and the flatness of the portion that becomes the packing mounting surface 14 increases. . Further, the folding of the outer end portion 51 of the press member 10 formed with the overdraw shape is also alleviated, and the undulation of the undulating portion 19 is reduced.

According to the burring method of the present embodiment described above, the following effects are obtained.
In the burring method according to the present embodiment, a pre-forming step (see FIG. 5) in which a portion 49 where the through hole 12 is formed protrudes in a tapered shape where the inclined portion 50 is formed, and the through hole 12 is formed. The punching step (see FIG. 8), the periphery of the through hole 12 in the press member 10 and a part of the inclined portion 50 on the through hole 12 side are formed into the rising portion 13, and the rising portion 13 from the remaining portion of the inclined portion 50. And a molding step (see FIG. 9) for molding the packing mounting surface 14 around the.

  As a result, a part of the inclined portion 50 formed in the pre-forming process is formed on the flat packing mounting surface 14 by the main forming, so that a crease is formed on the packing mounting surface 14 in the main forming process. Can be prevented.

  In the preforming step, the portion formed on the packing mounting surface 14 is between the outer end portion 51 that starts to incline toward the portion 49 where the through hole 12 is formed and the portion formed on the rising portion 13. The inclined portion 50 is formed so as to be positioned.

  As a result, it is possible to more reliably prevent a situation in which creases (swells 19) caused by the outer end 51 of the inclined part 50 occur on the packing mounting surface 14. Moreover, the press member 10 in which the swell portion 19 is positioned outside the packing mounting surface 14 can be easily formed only by setting the position of the outer end 51 based on the required shape of the packing mounting surface 14. .

  Further, the burring apparatus 40 of the present embodiment includes a lower die 41, a button die 42 provided on the lower die 41, a burring punch 44 for forming the rising portion 13, and an outer side of the outer end portion 51 of the press member 10. And a pad 43 to be pressed. Then, the burring punch 44 presses the through hole 12 side in the inclined portion 50 in a state where the outer side of the outer end portion 51 of the press member 10 is pressed by the pad 43 and the lower die 41. That is, in the main forming step, the rising portion 13 is formed by applying a pressing force to the inclined portion 50 so as to be pulled toward the through hole 12 while holding the vicinity of the outer end portion 51.

  As a result, the press member 10 is pulled toward the through hole 12 while being pressed outside the outer end portion 51, so that the high-quality press member 10 having the packing mounting surface 14 with sufficiently secured flatness is manufactured. Can do.

  A piercing punch 45 as a punching device, a burring punch 44 as a main forming device, and a button die 42 are mounted on the same burring processing device 40.

  Thereby, the operation for forming the through-hole 12 and forming the rising portion 13 can be performed by one burring apparatus 40, so that the burring time can be shortened and the punching apparatus and the main forming apparatus are arranged. The required space can be reduced in size.

  The press member 10 manufactured by the burring method is configured as follows. That is, the pressing member 10 having a through hole 12 to which the fuel pump 90 is attached and a rising portion 13 formed around the through hole 12, and a packing attachment that is formed flat around the through hole 12 and the rising portion 13. A surface 14 and a swell portion 19 which is the same surface as the packing mounting surface 14 and is formed outside the packing mounting surface 14. A fuel pump 90 is attached to the packing attachment surface 14 via a packing member 91.

  As a result, the swell portion 19 generated in the process of burring is located outside the packing mounting surface 14, so that it is possible to effectively prevent the swell portion 19 from forming a gap between the packing member 91 and the press member 10. can do.

  The preferred embodiments of the burring method, the burring system 20 and the press member 10 according to the present invention have been described above, but the present invention is not limited to the above-described embodiments, and can be modified as appropriate.

  In the said embodiment, although the punching process and the burring process were performed with the same burring processing apparatus 40, a punching process and a burring process can be performed with a respectively separate apparatus.

  In the above embodiment, the press member 10 constituting the fuel tank of the motorcycle has been described as an example, but the present invention is not limited to this configuration. For example, the burring method of the present invention can be applied to the manufacture of a press member that constitutes an automobile. Thus, the present invention can be applied to various moldings in the burring process for molding a press member that requires a flat portion.

DESCRIPTION OF SYMBOLS 10 Press member 12 Through-hole 13 Standing part 14 Packing attachment surface (flat part)
19 Swelling Section 20 Burring System 21 Draw Forming Equipment (Preliminary Forming Equipment)
40 Burring processing equipment (punching equipment, main forming equipment)
41 Lower mold 42 Button die 43 Pad 44 Burring punch (main forming equipment)
45 Piercing punch
49 Part where the through hole is formed 50 Inclined part 51 Outer end part (starting part)
90 Fuel pump 91 Packing member

Claims (6)

A burring method for producing a press member in which a rising portion is formed around a through hole,
A preforming step of projecting a portion in which the through hole is formed into a tapered shape in which an inclined portion is formed around the inclined portion, and forming the inclined portion in an entire region around the portion in which the through hole is formed; A preforming step of forming an end of the portion on the side of the through hole so as to be positioned closer to the end face side of the press member than a portion where the through hole is formed;
A piercing scrap is cut out from the press member by a piercing punch in which a blade is formed at an end portion, thereby forming a through hole; and
A book for forming the periphery of the through hole in the press member and a part of the inclined portion on the through hole side in the rising portion, and forming a flat portion around the rising portion from the remaining portion of the inclined portion. Molding process;
A burring method including: In the preforming step,
The inclined portion is formed such that the portion formed in the flat portion is located between the starting point portion starting to be inclined toward the portion where the through hole is formed and the portion formed in the rising portion. The burring method according to claim 1. In the main forming step,
3. The burring method according to claim 2, wherein the rising portion is formed by applying a pressing force to the inclined portion so as to be pulled toward the through-hole while holding the vicinity of the starting portion. A burring system for manufacturing a press member in which a rising portion is formed around a through hole,
A preforming device for projecting a portion where the through-hole is formed into a tapered shape in which an inclined portion is formed around the inclined portion, and forming the inclined portion over the entire area around the portion where the through-hole is formed, A preforming device for forming an end of the portion on the side of the through hole so as to be positioned closer to the end face side of the press member than a portion where the through hole is formed;
A punching device that forms the through-hole by cutting out a piercing scrap from a press member by a piercing punch in which a blade is formed at an end , and
A book for forming the periphery of the through hole in the press member and a part of the inclined portion on the through hole side in the rising portion, and forming a flat portion around the rising portion from the remaining portion of the inclined portion. A molding device;
A burring system. The preforming device is
The inclined portion is formed such that the portion formed in the flat portion is located between the starting point portion starting to be inclined toward the portion where the through hole is formed and the portion formed in the rising portion. And
The main forming apparatus includes:
A mold body;
A button die provided in the mold body;
A burring punch for forming the rising portion;
A pad that presses the outside of the starting portion in the inclined portion;
With
The burring processing system according to claim 4, wherein the through-hole side of the press member is pressed by the burring punch in a state where the outside of the starting portion of the press member is pressed by the pad and the die body.   The burring processing system according to claim 4 or 5, wherein the punching device and the main forming device are mounted on the same pressing device.

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