JP6552468B2 - Burring tool and burring machine - Google Patents

Description

  The present invention relates to a burring tool and a burring apparatus. In particular, a structure of a burring tool suitable for burring processing in which a pilot hole opened in a metal plate-shaped member is processed to form a flange raised from one surface of the plate-shaped member, and the burring tool is used. Relates to the structure of the burring apparatus.

  Burring is a processing method in which a pilot hole opened in a metal plate-shaped member is processed, and a flange raised from one surface of the plate-shaped member is formed. By using a burring tool to form a raised flange on one surface of the plate-like member, a female screw having a predetermined number of threads can be secured in a burring hole surrounded by the flange. Further, the shaft member can be fitted or press-fitted into the burring hole by forming a raised flange on one surface of the plate-like member using a burring tool.

  The burring can also be formed into a metallic tubular member. By forming the burring raised on the outer periphery of the metal tubular member, the tubular joint can be integrally formed without welding the tubular joint member to the outer periphery of the tubular member.

  By the way, in the burring process of such a tubular member, when the peripheral part of the pilot hole opened on the outer periphery is bent and raised from the inner wall toward the outer wall, the burring hole after burring becomes oval due to springback. I was worried about not getting roundness.

  In order to eliminate such problems, a burring tool for a tubular member is disclosed that can improve the workability and mass productivity of burring of a tubular member and can improve the processing accuracy of a burring hole after burring (for example, , Patent Document 1).

Japanese Patent Application Laid-Open No. 7-39945

  FIG. 8 is a front view showing the configuration of a burring tool according to the prior art, and is a state diagram before the burring tool is inserted into a pilot hole opened on the outer periphery of the tubular member. FIG. 9 is a front view showing a configuration of a burring tool according to the prior art, and is a state diagram in which burring is performed on the outer periphery of a tubular member. 8 and 9 of the present application correspond to FIGS. 1 and 4 of Patent Document 1, respectively.

  Referring to FIG. 8 or FIG. 9, a burring tool (hereinafter referred to as a punch) 9 according to the prior art is made of a steel cylindrical member, has a tip portion 9a formed in a truncated cone shape at the tip portion, and an inclined surface 9b. At the proximal end. When the pointed end 9a is arranged at the head and the punch 9 is moved from the inside of the tubular member P toward the pilot hole Hp, a burring Br can be formed on the outer periphery of the tubular member P (see FIG. 9).

  Referring to FIG. 8 or FIG. 9, a burring apparatus 8 according to the prior art includes a die 81, a slider 82, and a cylindrical holder 83. The die 81 is disposed on the outer periphery of the tubular member P. The die 81 cooperates with the punch 9 to open a forming hole 81h for forming the outer periphery of the burring Br.

  Referring to FIG. 8 or FIG. 9, the holder 83 is disposed inside the tubular member P so as to be coaxial with the tubular member P. Further, the holder 83 opens a guide hole 83 g for guiding the punch 9.

  Referring to FIG. 8 or 9, the slider 82 is disposed inside the holder 83. The slider 82 is guided by the holder 83 and can slide in the axial direction of the holder 83. The slider 82 has an inclined surface 9b of the punch 9 and a slidable inclined surface 82s at one end.

  When the slider 82 is moved to the left (X direction) from the state shown in FIG. 8, the inclined surface 9b of the punch 9 and the inclined surface 82s of the slider 82 slide, and the punch 9 can be moved in the outer peripheral direction of the tubular member P. . And burring Br can be formed in the outer periphery of the tubular member P (refer FIG. 9).

  Referring to FIG. 8 or FIG. 9, the punch 9 has a first circular flange 91 and a second circular flange 92. The outer diameter of the first circular flange 91 is φD1, the outer diameter of the second circular flange 92 is φD2, and φD1 <φD2.

  Referring to FIG. 8 or FIG. 9, the first circular flange 91 is continuous with the pointed portion 9a. The second circular flange 92 is formed at a predetermined distance from the first circular flange 91. Between the 1st circular collar part 91 and the 2nd circular collar part 92, the oil reservoir part 93 which can retain oil freely is comprised.

  Referring to FIG. 8 or 9, when the burring Br is formed by the first circular flange portion 91 of the punch 9, the thickness tb of the burring Br becomes approximately the same as the thickness t of the tubular member P. When the burring Br is formed at the second circular ridge portion 92 after burring at the first circular ridge portion 91, the thickness tb of the burring Br is smaller than the thickness t of the tubular member P.

  Referring to FIG. 8 or FIG. 9, the burring process in the second circular flange 92 is called ironing burring. The burring tool according to Patent Document 1 can obtain a flange having a uniform thickness by forming a burring Br having a thickness tb smaller than the thickness t of the tubular member P on the outer periphery of the tubular member P. The roundness can be improved.

  Press parts for automobiles (particularly suspension parts) are often required when the tolerance of burring holes is in the range of ± 0.05 mm to 0.15 mm. Generally, it is known that the burring hole is reduced in diameter by spring back after burring. However, the amount of diameter reduction of the burring hole differs depending on the material and thickness of the workpiece, even if the diameter of the burring hole is the same. For this reason, it is difficult to obtain a burring tool having an appropriate outer diameter before mass production of a pressed part having a highly accurate burring hole.

  For this reason, two to three trial burring tools having different outer diameters are prepared, and after burring a sample product, mass production is performed after confirmation that the hole diameter of the burring hole is within the required range. The outer diameter of the burring tool was determined. For this reason, it was necessary to replace the trial burring tools having different outer diameters with the burring apparatus.

  With the burring tool for ironing disclosed in Patent Document 1, a burring tool for trial production can be made. However, since the burring tool for ironing is severely worn on the outer periphery, it is necessary to treat the surface with, for example, titanium carbide (TiC) after quenching the burring tool. For this reason, manufacturing a plurality of burring tools having different outer diameters is expensive to manufacture, and if additional burring tools having different outer diameters are manufactured while checking the tolerance range, the number of manufacturing days is also increased. There was a problem of requiring a considerable period of time.

  There has been a demand for a burring tool with a low manufacturing cost and a burring apparatus using the burring tool without requiring a large number of prototypes. The above can be said to be the subject of the present invention.

  The present invention has been made in view of the above problems, and provides a burring tool that is inexpensive to manufacture without requiring a large number of prototypes, and a burring apparatus using the burring tool. The purpose is

  The present inventors constitute a burring tool including a cylindrical member having a multistage outer periphery whose outer diameter gradually increases in diameter from the distal end portion to the proximal end portion, and the burring device is operated with or without a spacer. It was considered that these problems could be solved by changing the stroke of the burring tool, and based on this, the following new burring tool and burring apparatus were invented.

  (1) A burring tool according to the present invention is a burring tool used for burring processing in which a pilot hole opened in a metal plate-shaped member is processed and a flange raised from one surface of the plate-shaped member is formed. A cone portion for expanding the diameter from the distal end portion to the base end portion and causing the peripheral portion of the pilot hole to rise from one surface of the plate-like member, and the outer periphery continues from the cone portion And a cylindrical portion for forming a burring hole in the plate-like member, and the cylindrical portion has a slight outer diameter stepwise from its distal end to its proximal end. It has a multi-stage outer periphery that expands in diameter.

  (2) The columnar part may be divided into a front part having a first outer diameter and a rear part having a second outer diameter slightly larger than the first outer diameter.

  (3) It is preferable that the internal thread part is screwed in the center part of the said cylindrical part toward the front-end | tip part from the base end surface of the said cylindrical part.

  (4) A burring apparatus according to the present invention has a base plate with a burring tool fixed in an upright state, a predetermined thickness, and a through-hole through which a cylindrical portion of the burring tool can be inserted at the center, A spacer plate which can be mounted on the base plate and a through hole through which the cylindrical portion can be inserted is provided at a central portion, and can be mounted on the spacer plate and in contact with the other surface of the plate member A blank holder having a free flat surface on the upper surface, and a die that is disposed opposite to the blank holder via the plate-like member and has a forming hole for forming the outer periphery of the burring at the center, When the die is advanced toward the blank holder in a state where the spacer plate is disposed between the base plate and the blank holder, a burring hole can be formed in the front portion of the cylindrical portion, The pacer board in a state removed from between the blank holder and the base plate, when advanced toward the die to the blank holder can be molded to the burring holes later section following the front portion of the cylindrical portion.

  (5) It is preferable that the burring apparatus according to the present invention further includes a knockout bar that is disposed at a central portion of the die so as to freely advance and retract, and that can discharge the plate-like member after burring from the die.

  The burring tool according to the present invention includes a cylindrical portion having a multi-stage outer periphery whose outer diameter slightly increases stepwise from the distal end portion toward the proximal end portion, so by changing the stroke of the burring tool, A single burring tool can prototype multiple burring holes having different inner diameters.

  The burring apparatus according to the present invention can change the stroke of the burring tool with or without the spacer plate.

It is a perspective view which shows the structure of the burring tool by one Embodiment of this invention, and is the state figure which looked at the burring tool from the front-end | tip part side. It is a perspective view which shows the structure of the burring tool by the said embodiment, and is the state figure which looked at the burring tool from the base end part side. It is a front view which shows the structure of the burring processing apparatus by one Embodiment of this invention, FIG. 3 (A) is a state figure which carried out the burring process in the front | former part of a burring tool, FIG.3 (B) is a back | latter stage part of a burring tool It is the state figure which carried out the burring process. It is the longitudinal cross-sectional view which expanded the principal part of the burring processing apparatus by the said embodiment, and is the state figure which inserted the front-end | tip part of the burring tool in the pilot hole of the plate-shaped member. It is the longitudinal cross-sectional view which expanded the principal part of the burring processing apparatus by the said embodiment, and is a state figure in the middle of processing the prepared hole of a plate-shaped member with a burring tool. It is the longitudinal cross-sectional view which expanded the principal part of the burring processing apparatus by the said embodiment, FIG. 6 (A) is a state figure which opened the burring hole in the front | former part of a burring tool, FIG.6 (B) is a state of a burring tool. It is the state figure which opened the burring hole in the back | latter stage part. It is the longitudinal cross-sectional view which expanded the principal part of the burring processing apparatus by the said embodiment, FIG. 7 (A) is an enlarged view of FIG. 6 (A), FIG.7 (B) is an enlarged view of FIG. It is. It is a front view which shows the structure of the burring tool by a prior art, and is a state figure before inserting a burring tool in the pilot hole opened to the outer periphery of a tubular member. It is a front view which shows the structure of the burring tool by a prior art, and is a state figure which carried out the burring process on the outer periphery of the tubular member.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
[Configuration of burring tool]
Initially, the structure of the burring tool by one Embodiment of this invention is demonstrated.

  FIG. 1 is a perspective view showing a configuration of a burring tool according to an embodiment of the present invention, and is a state diagram when the burring tool is viewed from the front end side. FIG. 2 is a perspective view showing the configuration of the burring tool according to the embodiment, and is a state diagram when the burring tool is viewed from the base end side. In addition, in FIG. 1, the plate-like member B in which the burring hole Hb was formed (after the burring process) is shown, and in FIG. 2, the plate-like member B in which the pilot hole Hp was formed (before the burring process) Show.

  1 or 2, a burring tool (hereinafter referred to as a punch) 1 according to an embodiment of the present invention processes a pilot hole Hp (see FIG. 2) opened in a metal plate member B, This is suitable for burring processing for forming a flange Fr raised from one surface Sf of the plate-like member B. The punch 1 is a prototype columnar burring tool for confirming that the hole diameter of the burring hole Hb (see FIG. 1) subjected to burring is within a predetermined tolerance range.

  Referring to FIG. 1 or FIG. 2, the punch 1 includes a thin cylindrical portion 11, a conical portion 12, and a cylindrical portion 13. The small diameter cylindrical portion 11 is formed at the tip of the punch 1. The small-diameter cylindrical portion 11 can be inserted into the lower hole Hp of the plate-like member B (see FIG. 2).

  Referring to FIG. 1 or FIG. 2, the outer periphery of the conical body portion 12 is continuous from the small-diameter cylindrical portion 11, and the diameter is increased toward the proximal end portion of the punch 1. When the small diameter cylindrical portion 11 is at the top and the punch 1 is inserted into the pilot hole Hp from the other surface Sr of the plate member B (see FIG. 2), the conical portion 12 is a plate member The surface can be raised from one surface Sf of B.

  Referring to FIG. 1 or FIG. 2, the cylindrical portion 13 has an outer periphery continuously extending from the cone portion 12 to the base end portion of the punch 1. The cylindrical portion 13 can form a burring hole Hb having a flange Fr in the plate member B (see FIG. 1).

  Referring to FIG. 1 or FIG. 2, the cylindrical portion 13 has a multi-stage outer periphery whose outer diameter is slightly increased stepwise from the distal end portion toward the proximal end portion. The cylindrical portion 13 according to the embodiment is divided into a front portion 131 having a first outer diameter d1 and a rear portion 132 having a second outer diameter d2 having a slightly larger outer diameter than the first outer diameter d1. For example, the first outer diameter d1 is “40.16” mm, and the second outer diameter d2 is “40.21” mm. That is, in this embodiment, the difference between the first outer diameter d1 and the second outer diameter d2 is set to 0.05 mm.

  Referring to FIG. 1 or FIG. 2, the punch 1 has a circular flange portion 13f at the base end portion. The punch 1 also has a female screw 13s at its proximal end. The female screw portion 13s is screwed to the central portion of the cylindrical portion 13 from the proximal end surface of the cylindrical portion 13 toward the distal end portion (see FIG. 2). The punch 1 can be fixed by fastening a bolt member (not shown) to the female screw 13s.

[Operation of burring tool]
Next, the operation and effect of the punch 1 according to the embodiment will be described. Referring to FIG. 1 or 2, punch 1 is preferably made of an alloy tool steel material (for example, SKD 11), and a punch 1 having a desired shape is formed by turning an alloy tool steel material made of a round bar. Can be obtained.

  Referring to FIG. 1 or 2, it is preferable that the outer diameter of the small diameter cylindrical portion 11, the conical portion 12, and the front end portion 131 and the rear end portion 132 of the cylindrical portion 13 be slightly mirror-polished. It is preferable to surface-treat these outer circumferences with titanium carbide (TiC). By subjecting the sliding portion of the punch 1 to fine mirror surface finishing and hardening surface treatment, abrasion of the punch 1 can be suppressed.

  Referring to FIG. 1 or FIG. 2, the punch 1 according to the embodiment includes a cylindrical portion 13 having a multi-stage outer periphery whose outer diameter slightly increases stepwise from the distal end portion toward the proximal end portion. By changing the stroke of the burring tool 1, a plurality of burring holes Hb having different inner diameters can be produced with a single burring tool 1.

[Configuration of burring machine]
Next, the configuration of a burring apparatus according to an embodiment of the present invention will be described. FIG. 3 is a front view showing the configuration of the burring apparatus according to one embodiment of the present invention, and FIG. 3 (A) is a state diagram in which burring is performed in the front part of the burring tool; It is the state figure which carried out the burring process in the back | latter stage part of the tool.

  FIG. 4 is an enlarged vertical cross-sectional view of a main part of the burring apparatus according to the embodiment, and is a state diagram in which the tip of the burring tool is inserted into the prepared hole of the plate-like member. FIG. 5 is an enlarged longitudinal sectional view of a main part of the burring apparatus according to the embodiment, and is a state diagram in the process of processing the prepared hole of the plate-like member with a burring tool.

  FIG. 6 is a longitudinal cross-sectional view enlarging the principal part of the burring apparatus according to the embodiment, and FIG. 6 (A) is a state diagram in which the burring hole is opened at the front part of the burring tool; 4 is a state diagram in which a burring hole is opened at a rear part of the burring tool.

  7 is an enlarged longitudinal sectional view of a main part of the burring apparatus according to the embodiment, FIG. 7A is an enlarged view of FIG. 6A, and FIG. 7B is FIG. Is an enlarged view of FIG.

  Referring to FIGS. 3 to 7, a burring apparatus (hereinafter abbreviated as a processing apparatus) 10 according to an embodiment of the present invention includes a base plate 21 and a pedestal 22. The processing apparatus 10 further includes a spacer plate 3 and a blank holder 4. Furthermore, the processing apparatus 10 is provided with a die set upper die 5 and a knockout rod 6.

  Referring to FIG. 3, the base plate 21 fixes the punch 1 in an upright state using a bolt member (not shown). The pedestal 22 opens at the center of the first through hole 22h. The pedestal 22 is fixed to the base plate 21 in a state in which the cylindrical portion 13 is inserted into the first through hole 22 h.

  Referring to FIG. 3A, the spacer plate 3 has a predetermined thickness and a second through hole 3h through which the cylindrical portion 13 of the punch 1 can be inserted. The spacer plate 3 is placed on the pedestal 22 in a state where the cylindrical portion 13 is inserted through the second through hole 3h.

  Referring to FIG. 3, the blank holder 4 includes a punch holder 41 and a punch plate 42. The punch holder 41 and the punch plate 42 are screwed integrally. The blank holder 4 opens at a central portion of the third through hole 4 h.

  Referring to FIG. 3A, the blank holder 4 is placed on the spacer plate 3 in a state where the cylindrical portion 13 is inserted through the third through hole 4h. On the other hand, by removing the spacer plate 3 from the state shown in FIG. 3A, the blank holder 4 can be placed on the pedestal 22 with the cylindrical portion 13 inserted through the third through hole 4h (FIG. 3 ( B) see).

  Referring to FIG. 3, the punch plate 42 has a flat surface 42f on the top surface. The flat surface 42f of the punch plate 42 contacts the other surface Sr of the plate-like member B, so that the other surface Sr of the plate-like member B can be made flat. That is, the flat surface 42f of the blank holder 4 can suppress wavy “wrinkles” that occur during burring.

  Referring to FIG. 3, the die set upper mold 5 is configured integrally with a die 51, a die holder 52, and a die plate 53. The die set upper mold 5 can advance toward the blank holder 4 and can also be retracted from the blank holder 4.

  Referring to FIG. 3, the die 51 is disposed to face the blank holder 4 with the plate-like member B interposed therebetween. Further, the die 51 is opened at a central portion with a forming hole 51 h for forming the outer periphery of the burring Br.

  3A, when the die 51 is advanced toward the blank holder 4 in a state where the spacer plate 3 is disposed between the pedestal 22 and the blank holder 4, a burring hole is formed at the front stage 131 of the cylindrical portion 13. Hb can be formed (see FIG. 1 or 2).

  On the other hand, referring to FIG. 3B, when the die 51 is advanced toward the blank holder 4 with the spacer plate 3 removed from between the base 22 and the blank holder 4, the front portion 131 of the cylindrical portion 13 is moved to the front portion 131. The burring hole Hb can be formed in the subsequent rear part 132 (see FIG. 1 or 2).

  Referring to FIG. 3, the processing apparatus 10 according to the embodiment can change the stroke of the punch 1 with or without the spacer plate 3. Thereby, a plurality of burring holes Hb having different inner diameters can be prototyped by one burring tool 1.

  Referring to FIG. 3, the knockout rod 6 is disposed in the center of the die 51 so as to be movable back and forth. When the knockout rod 6 is moved with respect to the die 51 in a state where the tip of the knockout rod 6 protrudes from the lower surface of the die 51, the plate-like member B after burring does not adhere to the die 51. The plate-like member B can be discharged from the die 51.

  Referring to FIG. 3, the knockout bar 6 opens a fitting hole 6h drilled from the tip surface. By rolling the thin cylindrical portion 11 of the punch 1 into the fitting hole 6h, the roll of the punch 1 can be suppressed.

[Operation of burring machine]
Next, the operation and effects of the processing apparatus 10 will be described while describing the operation of the processing apparatus 10 according to the embodiment.

  When FIG. 3 is referred, the blank holder 4 has stopped in the state which the front end surface (upper end surface of the cone part 12) of the punch 1 fell from the upper surface of the blank holder 4. FIG. Next, with the center of the thin cylindrical portion 11 and the center of the pilot hole Hp of the plate member B aligned (see FIG. 2), the plate member B is set in the blank holder 4 to perform burring processing. You can start.

  Next, referring to FIG. 4, when the die 51 is lowered toward the blank holder 4 via the plate-like member B, the plate-like member B can be sandwiched between the lower surface of the die 51 and the upper surface of the blank holder 4. Next, when the die 51 is further lowered, the thin cylindrical portion 11 can be relatively inserted into the pilot hole Hp (see FIG. 4).

  Next, referring to FIG. 5, when the die 51 is further lowered, the cone portion 12 is relatively raised, and the cone portion 12 is arranged on one surface of the plate-like member B on the peripheral portion of the pilot hole Hp. It can be raised from Sf.

  Next, referring to FIG. 3 (A) or FIG. 6 (A) and FIG. 7 (A), the die 51 is further lowered and the blank holder 4 is in close contact with the spacer plate 3 (FIG. ), The burring hole Hb can be formed in the plate-like member B at the front end portion 131 of the punch 1 (see FIG. 1).

  On the other hand, referring to FIG. 3 (B) or FIG. 6 (B) and FIG. 7 (B), when the die 51 is further lowered and the blank holder 4 is in close contact with the base 22 (see FIG. 3 (B)). The burring hole Hb can be formed in the plate-like member B at the rear end portion 132 of the punch 1 (see FIG. 1).

  3 to 7, the processing apparatus 10 according to the embodiment can change the stroke of the punch 1 with or without the spacer plate 3. Thereby, a plurality of burring holes Hb having different inner diameters can be prototyped by one burring tool 1.

  Although the burring tool and the burring apparatus according to the present invention have disclosed a structure suitable for a plate-like member, it can also be applied to a tubular member.

1 Punch (burring tool)
11 small diameter cylindrical portion 12 conical portion 13 cylindrical portion B plate member Br bar ring Fr flange Hb burring hole Hp pilot hole Sf plate side member Sr plate side member

Claims (4)

A burring tool used in a burring process for processing a pilot hole opened in a metal plate member to form a flange raised from one surface of the plate member, and from the tip to the proximal end A conical body for expanding the diameter toward the end and raising the peripheral edge of the pilot hole from one surface of the plate-like member, and the outer periphery from the conical body continues to the proximal end and the burring hole And a cylindrical portion for forming the plate-like member, wherein the cylindrical portion has a multistage outer periphery whose diameter gradually increases in a stepwise manner from the distal end to the proximal end. A base plate with the burring tool fixed in an upright state,
A spacer plate having a predetermined thickness and having a through hole through which the cylindrical portion of the burring tool can be inserted at a central portion thereof, the spacer plate being mountable on the base plate;
A blank holder having a through hole through which the cylindrical portion can be inserted at its center, and being freely mountable to the spacer plate and having a flat surface on its upper surface that can be abutted against the other surface of the plate-like member ,
And a die disposed opposite to the blank holder via the plate-like member and having a forming hole for forming the outer periphery of the burring open at the center.
When the die is advanced toward the blank holder with the spacer plate disposed between the base plate and the blank holder, a burring hole can be formed in the front portion of the cylindrical portion,
When the die is advanced toward the blank holder in a state where the spacer plate is removed from between the base plate and the blank holder, the burring hole can be formed at a rear stage following the front stage of the cylindrical portion. Burring processing equipment. The burring apparatus according to claim 1, wherein the cylindrical portion is divided into a front portion having a first outer diameter and a rear portion having a second outer diameter slightly larger than the first outer diameter. . The burring apparatus according to claim 1 or 2, wherein a female screw portion is screwed to a central portion of the cylindrical portion from the base end face of the cylindrical portion toward the distal end portion . The burring apparatus according to any one of claims 1 to 3 , further comprising: a knockout rod disposed at a central portion of the die so as to be movable back and forth, and capable of discharging the plate member after burring from the die.

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