JP5406650B2 - Cylindrical workpiece piercing apparatus and cylindrical workpiece forming apparatus - Google Patents

Description

  The present invention relates to a cylindrical workpiece piercing apparatus that simultaneously forms a plurality of piercing holes in a peripheral wall of a cylindrical workpiece, and a cylindrical workpiece forming apparatus that molds the peripheral wall of the cylindrical workpiece.

  Generally, when a piercing hole is pierced on the peripheral wall of a cylindrical workpiece from the inner peripheral surface side toward the outer peripheral surface, a processing burr is generated on the outer peripheral surface side of the peripheral wall, and a processing burr generated on the inner peripheral surface side is generated. On the other hand, by piercing the piercing hole from the outer peripheral surface side toward the inner peripheral surface, processing burrs are generated on the inner peripheral surface side of the peripheral wall, and the processing burrs generated on the outer peripheral surface side are suppressed. Are known. On the other hand, deburring for removing the processing burr generated on the inner peripheral surface side of the peripheral wall is extremely troublesome and requires a large number of work steps.

  Therefore, various piercing apparatuses that suppress machining burrs generated on the inner peripheral surface side of the peripheral wall by simultaneously piercing a plurality of piercing holes on the peripheral wall of the cylindrical workpiece from the inner peripheral surface side toward the outer peripheral surface. is there.

  For example, Patent Document 1 discloses a piercing apparatus that pierces a plurality of pierced holes simultaneously on the peripheral wall of this type of cylindrical workpiece from the inner peripheral surface side toward the outer peripheral surface. The piercing apparatus disclosed in Patent Document 1 will be described with reference to FIG.

  FIG. 27 is a partial cross-sectional view showing an outline of the piercing apparatus. A bolster 121 of the press apparatus is provided with a lower holder 122 for holding the cylindrical workpiece 140, and a plurality of slides 123 are arranged on the lower holder 122 with the cylindrical workpiece 140. It is provided to be slidable in the radial direction. Each slide 123 is fixed with a piercing punch 124 corresponding to the inner peripheral surface side of the cylindrical workpiece 140 set in the lower holder 122, and a driven cam portion 125 is formed on the outer peripheral surface side of the cylindrical workpiece 140. The A return spring 128 is disposed between each slide 123 and a spring receiver 127 provided on the outer periphery of the lower holder 122. The return spring 128 urges the slide 123 toward the center of the cylindrical workpiece 140.

  On the other hand, the cam inclined surface 131a at the tip of the upper holder 130 provided on the slide of the press device comes into contact with the driven cam portion 125 of the slide 123 as the upper holder 130 is lowered, so that the slide 123 has a diameter of the cylindrical workpiece 140. A slide cam 131 is provided for driving in the direction. Further, a piercing die 136 facing the piercing machining punch 124 is provided in a block portion 135 provided in a portion of the lower holder 122 located on the outer peripheral surface side of the cylindrical workpiece 140 and inside the slide cam 123. The block portion 135 is provided with a discharge hole 137 for discharging punch scraps punched from the cylindrical workpiece 140 by the cooperation of the piercing punch 124 and the piercing die 136.

  When the slide of the press machine is at the top dead center, the upper holder 130 is separated from the lower holder 122. In this top dead center state, the cylindrical workpiece 140 is set on the lower holder 122, the cam inclined surface 131a of the slide cam 131 that descends as the upper holder 130 descends contacts the driven cam portion 125, and the slide 123 returns to the return spring. The piercing punch 124 cooperates with the piercing die 136 to pierce the pierced hole 143 in the peripheral wall 141 of the cylindrical workpiece 140 against 128. The punched punch punched out is discharged out of the apparatus through the discharge hole 137.

  When the slide cam 131 moves upward from the completion of the piercing process at the bottom dead center of the slide of the press machine, as the slide cam 131 rises, the piercing punch 124 is moved through the slide 123 by the return spring 128 through the cylindrical workpiece 140. The peripheral wall 141 is pulled away from the pierced hole 143.

JP-A-8-99133

  According to the said patent document 1, the process burr | flash which generate | occur | produces on the inner peripheral surface side of a peripheral wall is suppressed by carrying out the piercing process of the piercing hole from the inner peripheral surface side to an outer peripheral surface in the peripheral wall of a cylindrical workpiece.

  However, according to Patent Document 1, since the peripheral wall is locally pierced by the block portion and the piercing punch, the deformation of the peripheral wall of the cylindrical workpiece is a concern. Furthermore, a piercing punch is provided on the inner peripheral surface side of the peripheral wall of the cylindrical workpiece on the slide provided in the lower holder so as to be slidable in the radial direction, and a driven cam portion is formed on the outer peripheral surface side of the peripheral wall. The cylindrical workpiece is pierced by the cooperation of the piercing die and the piercing die by driving the slide in the radial direction of the workpiece by abutting the cam inclined surface of the slide cam that descends as the slide descends with the driven cam portion. Since the processing is performed, the distance from the sliding surface between the lower holder and the slide to the piercing punch, that is, the piercing position, is large, and a large rotational stress is applied to the slide along with the piercing. For this reason, the required rigidity of the slide is increased, and the slide is inevitably increased in size due to an increase in thickness or reinforcement of the slide.

  As the size of the slide increases, the number of radially arranged slides is greatly limited, and in particular, the number of piercing holes that are pierced on the peripheral wall of a relatively small diameter cylindrical workpiece is limited. In addition, as the size of the slide increases, it is necessary to increase the size of the return spring that pulls the slide away from the cylindrical workpiece after the end of the piercing process, which makes it difficult to place more slides.

  Accordingly, in view of such a point, a first object of the present invention is to provide a cylindrical workpiece piercing apparatus that is excellent in machining accuracy and that can simultaneously make a large number of piercing holes on the peripheral wall of the workpiece.

  A second object is to provide a cylindrical workpiece forming apparatus having excellent machining accuracy.

The invention of the apparatus for piercing a cylindrical workpiece according to claim 1 , which achieves the first object, comprises a lower mold and an upper mold that moves up and down along the central axis and contacts and separates from the lower mold. In the piercing apparatus for piercing a plurality of pierced holes radially on the peripheral wall of the workpiece, the lower mold is radially arranged around the central axis outside the peripheral wall of the cylindrical workpiece set around the central axis. A die slide that moves forward and backward between a forward end that approaches the central axis and a backward end that is separated from the central axis, has a piercing die on the front end surface, and has a die driven cam surface formed on the rear end surface; It is radially arranged around the central axis inside the peripheral wall of the cylindrical workpiece set around the central axis, and moves forward and backward between a forward end away from the central axis and a reverse end approaching the central axis. With a peer on the front end face A punch driven cam surface is formed on the rear end surface, and a plurality of punch slides having a punch return driven cam surface and a punch return driven cam surface formed on each punch slide are slidable. A cam return having a cam return driver having a punch return drive cam surface, and a punch driver having an upper die extending downward along the central axis and having a punch drive cam surface on the outer periphery of the tip; A die driver having a die driver extending downward and having a die drive cam surface continuously formed at the tip thereof, and the die drive cam surface of the die driver that sequentially descends as the upper die is lowered is the die follower of each die slide. Each die slide moves forward in sliding contact with the cam surface, and the piercing die presses the outer peripheral surface of the peripheral wall of the cylindrical workpiece, and the tip of the punch driver is Each piercing punch but the punch return drive cam surface is spaced from the punch return the driven cam surface pushes down the cam return, and the punch driving cam surface is in sliding contact with each punch slide in the punch follower cam surface moves forward And the piercing dies work together to pierce the pierced hole in the peripheral wall, and the mu-retro contact by the tip of the punch driver that rises as the upper die rises is released, and each cam return driver of the cam return punch return drive cam surface is characterized by causing backward movement of the sliding contact with the punch slide in the punch return the driven cam face.

  According to this, since the piercing punch is provided on the front end surface of the punch slide and the punch driven cam surface that is in sliding contact with the punch driver cam surface of the punch driver is formed on the rear end surface, the required rigidity of the punch slide can be suppressed and the punch slide can be suppressed. The slide can be downsized. Furthermore, since the punch return driving cam surface of each cam return driver is in sliding contact with the punch return driven cam surface of each punch slide and the punch slide is moved backward, the punch slide is moved backward after conventional piercing. Combined with the fact that a return spring or the like is not necessary, it is possible to increase the number of piercing holes that are pierced simultaneously on the peripheral wall of the cylindrical workpiece.

  In addition, as the number of punch slides increases, the number of die slides arranged opposite to the punch slides increases, and a large number of piercing dies arranged radially at equal intervals along with the piercing process move the outer peripheral surface of the peripheral wall. By pressing evenly at equal intervals, deformation such as distortion of the peripheral wall is corrected, and a highly accurate processed product is obtained.

The invention of a cylindrical workpiece piercing apparatus according to claim 2 is provided with a lower mold and an upper mold that moves up and down along the central axis and contacts and separates from the lower mold, and a plurality of piercing holes are formed in the peripheral wall of the cylindrical workpiece. In the piercing apparatus for piercing the workpiece, the lower die is arranged radially around the central axis outside the peripheral wall of the cylindrical workpiece set around the central axis, and the forward end approaches the central axis. A die driven cam surface that moves forward and backward between the center axis and the rearward end that is separated from the center axis, has a piercing die on the front end surface, and inclines so as to move away from the center axis as the rear end surface moves downward from above And a plurality of die slides in which a flat surface parallel to the central axis is continuously formed, die return means for urging the die slide toward the backward movement end, and a cylindrical work set around the central axis A front end face that is radially arranged around the central axis inside the wall, moves forward and backward between a forward end away from the central axis and a reverse end approaching the central axis, and faces the front end face of the die slide. A punch driven cam surface which is inclined to approach the center axis as it moves downward from above on the rear end face, and punch return which gradually moves away from the center axis as it moves upward from below For a cam return having a plurality of punch slides having a driven cam surface, and a punch return drive cam surface that protrudes radially from the main body and can be slidably contacted with the punch return driven cam surface formed on each of the punch slides. A cam return having a driver and an actuator for urging the cam return upward, and the upper die is located at the center axis A punch driver having a trapezoidal cone-shaped punch driving cam surface that extends downward and gradually decreases in diameter as it moves to the distal end outer periphery, and the punch driver is disposed concentrically and has a central axis Is a cylindrical shape extending downward along the inner circumferential surface of the true cylinder, and a trapezoidal cone-shaped cam surface for dice drive that is inclined so as to gradually move away from the central axis as it moves to the tip side. The die drive cam surface of the die driver that descends sequentially as the upper die descends slidably contacts the die driven cam surface of each die slide so that each die slide advances simultaneously against the die return means. The piercing die moves and the outer peripheral surface of the peripheral wall of the cylindrical workpiece is pressed, and the inner peripheral surface of the die driver is brought into sliding contact with the flat surface of each die slide to bring each die driver to the forward end position. The punch driver tip pushes down the cam return to separate the punch return driving cam surface from the punch return driven cam surface, and the punch driving cam surface slides against each punch driven cam surface to each punch slide. Punches pierce holes from the inner peripheral surface side to the outer peripheral surface side of the peripheral wall in cooperation with the piercing punches and the piercing dies, and the punch that rises as the upper die rises The cam return pressing force by the tip of the driver is released and the cam return drive cam surface of each cam return driver slides into contact with the punch return driven cam surface to move the punch slide backward. The peripheral surface and the die driving cam surface are separated from the die driven cam surface of each die slide, and each die is moved by the bias of the die return means. Characterized in that the scan slide moves backward movement.

  According to this, a piercing punch for piercing the peripheral wall of the cylindrical workpiece from the inner peripheral surface side toward the outer peripheral surface is provided on the front end surface of the punch slide, and the punch is in sliding contact with the punch driver cam surface of the punch driver on the rear end surface. Since the driven cam surface is formed, the rotational moment acting on the punch slide during piercing is small, the required rigidity of the punch slide can be suppressed, and the punch slide can be downsized. Furthermore, since the punch return driving cam surface of each cam return driver is in sliding contact with the punch return driven cam surface of each punch slide and the punch slide is moved backward, the punch slide is moved backward after conventional piercing. Combined with the fact that a return spring or the like is not necessary, the limitation on the number of punch slides arranged radially is relaxed, and the number of piercing holes that are pierced simultaneously on the peripheral wall of the cylindrical workpiece can be increased.

  In addition, as the number of punch slides increases, the number of die slides arranged opposite to the punch slides increases, and a large number of piercing dies arranged radially at equal intervals along with the piercing process move the outer peripheral surface of the peripheral wall. The piercing punch provided on the punch slide is pressed evenly at equal intervals, and the inner peripheral surface of the peripheral wall is evenly pressed at equal intervals to correct deformation such as distortion of the peripheral wall, resulting in a highly accurate processed product. It is done.

  According to a third aspect of the present invention, in the apparatus for piercing a cylindrical workpiece according to the first or second aspect, the punch slide includes the punch return driven cam surface that gradually moves away from the center axis as it moves from the lower side to the upper side. A cam return insertion hole is formed, and the cam return protrudes radially from the main body and the cam return insertion hole formed in each punch slide from below and is slidably contacted with the punch return driven cam surface. A cam return driver having the punch return driving cam surface is provided.

  This is a specific configuration of the punch slide and cam return. The punch return is provided with a cam return insertion hole having a punch return driven cam surface, and the cam return is inserted into the cam return insertion hole from below. By providing a cam return driver having the punch return drive cam surface slidably in contact with the driven cam surface, the restriction of the punch slides arranged radially is relaxed, and the peripheral wall of the cylindrical workpiece is effectively pierced simultaneously. It is possible to increase the number of piercing holes.

  According to a fourth aspect of the present invention, in the piercing apparatus according to any one of the first to third aspects, the inner wall of the set cylindrical workpiece has an opening in which the cam return is disposed at the center. And a plurality of die slide guide grooves formed radially about the central axis so as to slidably hold the die slides, and continuously formed in the die slide guide grooves inside the peripheral wall of the set cylindrical workpiece. And a set plate having a plurality of punch slide guide grooves that are radially formed around the central axis and hold the die slides in a slidable manner.

  According to this, the die slide, punch slide, and cam return can be moved stably with a simple configuration with a set plate having an opening in the center and a plurality of die slide guide grooves and punch slide guide grooves radially. Can be kept in a state.

The invention of a cylindrical workpiece forming apparatus according to claim 5 which achieves the second object includes a lower die and an upper die which moves up and down along the central axis and contacts and separates from the lower die. In the cylindrical workpiece forming apparatus for forming the peripheral wall of the cylindrical workpiece, the lower die is radially arranged around the central axis outside the peripheral wall of the cylindrical workpiece set around the central axis, and advances toward the central axis A plurality of die slides that move forward and backward between an end and a reverse end that is separated from the central axis and that have a first pressing member on the front end surface, and that have a die driven cam surface formed on the rear end surface; and the central axis Are arranged radially around the central axis on the inside of the peripheral wall of the cylindrical workpiece set around the center, and move forward and backward between the forward end separated from the central axis gland and the backward end approaching the central axis. The front end surface is provided with a second pressing member, and the rear end A plurality of punch slides having a punch driven cam surface and a punch return driving cam surface slidably brought into contact with the punch return driven cam surface formed on each of the punch slides. A cam return having a cam return driver, and an upper die extending downward along the central axis and having a punch driving cam surface on the outer periphery of the tip, and extending downward to the tip A die driver having a die drive cam surface continuously formed, and the die drive cam surface of the die driver that sequentially descends as the upper die is lowered comes into sliding contact with the die driven cam surface of each die slide. Moves forward, the first pressing member presses the outer peripheral surface of the peripheral wall of the cylindrical workpiece, and the tip of the punch driver presses the cam return to pan. The return driving cam surface is separated from the punch return driven cam surface, and the punch driving cam surface slides on each punch driven cam surface so that each punch slide moves forward to move the second press forming member and the first press forming member. The members cooperate to form the peripheral wall, and the press return of the mu return by the tip of the punch driver that rises as the upper die rises is released, so that the cam return driving cam surface of each cam return driver of the cam return in sliding contact with the punch return the driven cam surface, characterized in that to reverse the movement of the punch slide.

  According to this, a punch driven cam surface is formed on the front end surface of the second press-forming member facing the inner peripheral surface of the peripheral wall surface of the cylindrical workpiece, and the rear end surface is in sliding contact with the punch driving cam surface of the punch driver. The punch slide can be reduced in size, and the punch return drive cam surface of each cam return driver is in sliding contact with the punch return driven cam surface of each punch slide to move the punch slide backward. Therefore, the restriction of the punch slides arranged radially with the size reduction of the punch slide is eased, and the punch slide can be increased, and the die slide including the first pressing member arranged to face the punch slide is provided. Increased, a large number of first pressing members arranged radially at equal intervals press the outer peripheral surface of the peripheral wall evenly at equal intervals. Deformation such as distortion of the peripheral wall evenly pressed at regular intervals and the second pressure member to the inner peripheral surface of the peripheral wall provided in the punch slide is corrected, high-precision machining products are obtained.

The invention of a cylindrical workpiece forming apparatus according to claim 6 includes a lower mold and an upper mold that moves up and down along the central axis and contacts and separates from the lower mold, and forms the peripheral wall of the cylindrical workpiece. In the molding apparatus, the lower mold is radially arranged around the central axis outside the peripheral wall of the cylindrical workpiece set around the central axis, and is separated from the forward end approaching the central axis and the central axis. Parallel to the die driven cam surface and the central axis that are moved forward and backward with respect to the rearward end and that are provided with a first pressing member on the front end surface, and that are inclined away from the central axis as the rear end surface is shifted downward from above. A plurality of die slides each having a flat surface continuously formed, die return means for urging the die slides toward the backward movement end, and a central axis line on the inner wall of the cylindrical workpiece set around the central axis line. Radially in the center The second end of the die slide is provided on the front end surface of the die slide that moves forward and backward between the forward end separated from the central axis and the reverse end approaching the central axis. A cam driven cam surface having a punch driven cam surface that is inclined so as to approach the central axis as it moves from the upper side to the lower side, and that gradually moves away from the central axis as it moves from the lower side to the upper side. A plurality of punch slides in which holes are formed, and punches that are slidably contacted with the punch return driven cam surface by being inserted from below into the main body and cam return insertion holes formed in the punch slides that protrude radially from the main body. A cam return having a cam return driver having a return drive cam surface, and an actuator for biasing the cam return upward A punch driver having a trapezoidal cone-shaped punch driving cam surface that extends downward along the central axis and gradually decreases in diameter as it moves to the distal end outer periphery. A trapezoidal shape in which the punch driver is arranged concentrically and extends downward along the central axis, and is inclined so as to be gradually separated from the central axis as it moves to the inner peripheral surface and the tip side of the true cylinder. A die driver having a conical die drive cam surface formed continuously is provided, and the die drive cam surface of the die driver that sequentially descends as the upper die descends is in sliding contact with the die driven cam surface of each die slide. Each die slide moves forward against the die return means at the same time, the first pressing member presses the outer peripheral surface of the peripheral wall of the cylindrical workpiece, and the inner peripheral surface of the die driver slides on the flat surface of each die slide. The die driver is held in the forward end position, the tip of the punch driver pushes down the cam return, the cam return driver is pulled out from the cam return insertion hole, and the cam surface for punch driving is in sliding contact with each punch driven cam surface. As the punch slides move forward simultaneously, the second press forming member and the first press forming member cooperate to form the peripheral wall, and the cam return is caused by the tip of the punch driver that rises as the upper die rises. The push return is released and each cam return driver of the cam return enters the cam return insertion hole of each punch slide, the cam surface for the punch return drive slides on the punch return driven cam surface, and the punch slide is moved backward. the inner peripheral surface and the die drive cam face of the die driver away from the die driven cam surface of each die slide die return Each dice slide by the urging of the stage, characterized in that the backward movement.

According to this, a punch driven cam surface is formed on the front end surface of the second press-forming member facing the inner peripheral surface of the peripheral wall surface of the cylindrical workpiece, and the rear end surface is in sliding contact with the punch driving cam surface of the punch driver. The rotational moment acting on the punch slide is extremely small, the required rigidity of the punch slide can be suppressed, and the punch slide can be reduced in size, and the cam return driving cam surface of each cam return driver is the punch return driven cam of each punch slide. Since the punch slide is moved backward in sliding contact with the surface, the restriction of the punch slide arranged radially is reduced with the downsizing of the punch slide, and the punch slide is arranged to face the punch slide as the number of punch slides increases. The number of die slides provided with the first pressing member is increased, and a large number of first pressing members are arranged radially at equal intervals. The forming member presses the outer peripheral surface of the peripheral wall evenly at equal intervals, and the second press forming member provided on the punch slide uniformly presses the inner peripheral surface of the peripheral wall at equal intervals to deform the peripheral wall. Corrected and high-precision processed products are obtained.

  According to the punching device for a cylindrical workpiece according to the present invention, the restriction of punch slides arranged radially is reduced as the punch slide is miniaturized, and it is possible to increase the number of piercing holes that are pierced simultaneously on the peripheral wall of the cylindrical workpiece. In addition, the number of die slides arranged opposite to the punch slide is increased, and a large number of piercing dies arranged radially at equal intervals as punching presses the outer peripheral surface of the peripheral wall evenly at equal intervals, and the punch slide The piercing punch provided on the inner wall uniformly presses the inner peripheral surface of the peripheral wall at equal intervals to correct deformation such as distortion of the peripheral wall, and a highly accurate processed product is obtained.

  According to the cylindrical workpiece forming apparatus of the present invention, the restriction of the punch slides arranged radially is reduced with the size reduction of the punch slides, and the first press arranged facing the punch slides with the increase of the punch slides. The number of die slides provided with members is increased, and a number of first press-molding members arranged radially at equal intervals press the outer peripheral surface of the peripheral wall evenly at equal intervals, and second press-molding members provided on the punch slide However, the inner peripheral surface of the peripheral wall is evenly pressed at equal intervals to correct deformation such as distortion of the peripheral wall, and a highly accurate processed product can be obtained.

It is explanatory drawing which shows an example of the cylindrical workpiece | work used as a shaping | molding raw material, (a) is a perspective view of a cylindrical workpiece, (b) is the bb sectional view taken on the line of (a). It is explanatory drawing which shows an example of a molded article, (a) is a perspective view of a molded article, (b) is the cc sectional view taken on the line of (a). It is principal part sectional drawing which shows the piercing apparatus in embodiment. It is the IV section enlarged view of FIG. It is a principal part top view of the lower mold | type which abbreviate | omitted the 1st give plate and the 2nd give plate. FIG. 6 is an enlarged view of a part VI in FIG. 5. It is a top view of a set plate. It is the VIII-VIII sectional view taken on the line of FIG. It is the IX section enlarged view of FIG. FIG. 10 is a sectional view taken along line XX in FIG. 9. It is the XI-XI sectional view taken on the line of FIG. It is the XII-XII sectional view taken on the line of FIG. It is a top view of a die slide. It is the XIV-XIV sectional view taken on the line of FIG. It is a XV arrow line view of FIG. It is a top view of a punch slide . It is a side view of a punch slide . It is a XVIII arrow directional view of FIG. It is an operation | movement process diagram of the piercing apparatus which shows the state in a raise position. It is an operation | movement process diagram of the piercing apparatus which shows the principal part of a descent | fall state. It is an operation | movement process diagram of the piercing apparatus which shows the principal part of a descent | fall state. It is an operation | movement process diagram of the piercing apparatus which shows the principal part of a process completion state. It is an operation | movement process diagram of the piercing apparatus which shows the principal part of a raise state. It is an operation | movement process diagram of the piercing apparatus which shows the principal part of a raise state. It is an operation | movement process diagram of the piercing apparatus which shows the principal part of a raise state. It is an operation | movement process diagram of the piercing apparatus which shows the principal part of a raise state. It is a figure which shows the outline | summary of the conventional piercing apparatus.

  Hereinafter, an embodiment of a cylindrical workpiece piercing apparatus having a cylindrical workpiece forming apparatus according to the present invention will be described with reference to FIGS.

  Prior to the description of the piercing apparatus 1, an example of a molding material and a molded product after the molding process will be described with reference to FIGS. 1 and 2. 1A and 1B are explanatory views showing an example of a cylindrical workpiece 100 that is a forming material. FIG. 1A is a perspective view of the cylindrical workpiece 100, and FIG. 1B is a sectional view taken along line bb in FIG. The cylindrical workpiece 100 is formed in advance by flow forming or the like, and has a disc-shaped flange 103 in which a circular opening 102 penetrating in the center axis La direction is formed at the center, and a base edge on the outer periphery of the flange 103 The boss portion 101 is formed by a cylindrical tube portion 104 having a continuous shape, a disc-shaped step portion 105 whose diameter is expanded in the radial direction from the distal end edge of the tube portion 104, and a base end edge is continuous with the outer periphery of the step portion 105. In addition, a conical taper portion 106 whose diameter gradually increases so as to move away from the central axis La as it moves toward the distal end side, and a cylindrical peripheral wall 107 having a base end edge continuous with the outer periphery of the taper portion 106 are in the direction of the central axis La The ring-shaped thick portion 108 is formed along the tip 107 c of the peripheral wall 107. When the cylindrical workpiece 100 is machined, the central axis La is set on the piercing machine 1 coaxially with the central axis L of the piercing machine 1.

  FIG. 2 is an explanatory view showing an example of a molded product 110 obtained by molding the cylindrical workpiece 100 by the piercing apparatus 1, wherein (a) is a perspective view of the molded product 110, and (b) is a cc of (a). It is line sectional drawing. The molded product 110 is provided with reference numerals corresponding to the portions corresponding to the cylindrical workpiece 100 and will not be described in detail. However, distortions and the like generated on the peripheral wall 107 of the cylindrical workpiece 100 formed by flow forming molding or the like are omitted. In addition to ensuring the shape dimensional accuracy of the peripheral wall 107 by correcting, a large number of the peripheral wall 107 that penetrates from the inner peripheral surface 107a to the outer peripheral surface 107b radially at equal intervals in the circumferential direction, in the present embodiment, 24 pierce holes 111. Is formed.

  Next, the piercing apparatus 1 will be described. FIG. 3 is a cross-sectional view of the main part showing the piercing apparatus 1 according to the present embodiment, and FIG. 4 is an enlarged view of the IV part of FIG.

  The piercing apparatus 1 includes a set plate 10 that is fixed to a bolster 2 of a press apparatus, and a holder 50 that is fixed to a slide of the press apparatus that moves up and down along a central axis L extending in the vertical direction toward the set plate 10. When processing the cylindrical workpiece 100, the cylindrical workpiece 100 is set coaxially with the workpiece axis L.

  The piercing device 1 includes 24 die slides 20 that are fixed to the bolster 2 of the press device and are radially arranged on the set plate 10 outside the peripheral wall 107 of the cylindrical workpiece 100 in the radial direction. While having a lower mold | type provided with each punch slide 30, the cam return 40, the 1st give plate 45, the 2nd give plate 46 etc. which are arrange | positioned facing each die slide 20 in the radial inside of the surrounding wall 107, it is the slide 3 of a press apparatus. The holder 50 is fixed to the lower surface 51 of the holder 50, and a punch driver 60, a work presser 70, and a die driver 80 are disposed on the lower surface 51 of the holder 50, and an upper die that moves up and down along the central axis L is provided.

  These are arranged on the set plate 10 fixed to the bolster 2, the die slide 20, the punch slide 30, the cam return 40, the first give plate 45, the second give plate 46, and the holder 50 fixed to the slide 3. The punch driver 60, the work presser 70, the die driver 80 and the like will be described in order.

  The set plate 10 will be described with reference to FIGS. FIG. 5 is a plan view of the lower mold in which the first and second gibbing plates 45 and 46 are omitted, FIG. 6 is an enlarged view of a portion VI in FIG. 5, FIG. 7 is a plan view of the set plate 10, and FIG. VIII-VIII sectional view, FIG. 9 is an enlarged view of the IX portion of FIG. 7, FIG. 10, FIG. 11 and FIG. 12 are XX sectional view, XI-XI sectional view, XII-XII sectional view of FIG. FIG. 7 and 9, the cam return 40 is indicated by a broken line.

  The set plate 10 includes a base portion 12 having a substantially disk shape in a plan view having a circular opening 11 extending along the central axis L direction at the center portion. In this embodiment, 24 outer partition walls 13 are provided at regular intervals in a radial manner around the central axis L, and are arranged in the radial direction from the side of the central axis L by the side surfaces of the outer partition walls 13 and the upper surface of the base portion 12 facing each other. 24 dice slide guide grooves extending radially about the central axis L on the radially outer side of the peripheral wall 107 of the cylindrical workpiece 100 set with a pair of guide side surfaces 15a and a guide bottom surface 15b. 15 is formed. A punch residue discharge hole 15c continuous downward is opened in the guide bottom surface 15b of each die slide guide groove 15. The top 13a of the outer partition 13 is flat and serves as a mounting surface for a second give plate 46, which will be described later.

  In addition, 24 inner partition walls 16 are erected at equal intervals along the inner edge of the base portion 12, that is, the opening 11, and the central axis L side is centered by the side surface of each opposing inner partition wall 16 and the upper surface of the base portion 12. Twenty-four pieces extending radially about the central axis L on the radially inner side of the peripheral wall 107 of the cylindrical workpiece 100 set with a pair of guide side surfaces 17a and guide bottom surfaces 17b extending radially. A punch slide guide groove 17 is formed. A U-shaped cam return insertion slit 17c is formed in the guide bottom surface 17b of each punch slide guide groove 17 so as to open on the opening 11 side and up and down.

  The punch slide guide groove 17 has an outer end continuous with the inner end of the die slide guide groove 15, and each die slide guide groove 15 and the punch slide guide groove 17 are continuously formed in the radial direction. Between the guide bottom surface 15 b of the groove 15 and the guide bottom surface 17 b of the punch slide guide groove 17, a workpiece insertion groove 18 having a U-shaped cross section that is continuous in an annular shape in plan view with the central axis L as the center is formed. The tip 107 c of the peripheral wall 107 of the cylindrical workpiece 100 to be set is inserted into the workpiece insertion groove 18.

  Further, a give plate mounting portion 19 is provided between each outer partition wall 13 and the inner partition wall 16 of the base portion 12. The inner partitions 16 and the top portions 16a and 19a of the give plate mounting portion 19 are formed flat and serve as mounting surfaces for the first give plate 45 described later.

  The die slide 20 will be described with reference to FIGS. 3, 4, 5, 13, 14, and 15. 13 is a plan view of the die slide 20, FIG. 14 is a sectional view taken along line XIV-XIV in FIG. 13, and FIG. 15 is a view taken in the direction of arrows XV in FIG.

  The die slide 20 is fitted to the die slide guide groove 15 of the set plate 10 so as to be movable toward and away from the central axis L on the radially outer side of the peripheral wall 107 of the cylindrical workpiece 100 to be set. Both side surfaces 21a slidably contacting the guide bottom surface 15b, the bottom surface 21b and the top surface 21c, the front end surface 22 on the center axis L side, and projecting from the outer end of the dice slide guide groove 15 are separated from the center axis L as they move downward from above. The die driven cam surface 23a inclined in this manner and the flat surface 23b parallel to the central axis L are formed in a block shape having a rectangular cross section having a rear end surface 23 formed continuously.

  A stopper 24 that restricts the radially outward moving end of the die slide 20, that is, the reverse end, by abutting against a diameter stop 46 d formed on the upper surface 21 c by a peripheral edge of an opening 46 a of the second give plate 46 described later. Is projected, and the die slide 20 is separated from the center axis L between the outer periphery of the set plate 10 and the end of the die slide 20, and the rear end surface 23 protrudes from the outer periphery of the set plate 10. A die return means 25 such as a spring for biasing is provided.

  Further, a through hole 26a penetrating from the front end surface 22 to the rear end surface 23 is formed, and a cylindrical die attachment portion 27 is formed on the front end surface 22 side of the through hole 26a. A button die type piercing die 28 having a cylindrical and oval cutting blade 28a also serving as a one-press molding member is attached in a state in which its tip 28b protrudes from the front end face 22. The through hole 26a communicates with the bottom surface 21b, and the opening 26c has a communication hole 26b that communicates with the punch waste discharge hole 15c. The outer end side of the through hole 26a is closed with a plug member 26d, and the piercing die A punch residue discharge hole 26 communicating with the punch residue discharge hole 15c from 28 is formed.

The punch slide 30 will be described with reference to FIGS. 4, 5, 16, 17, and 18. FIG. 16 is a plan view of the punch slide 30, FIG. 17 is a side view, and FIG. 18 is an XVIII arrow in FIG. FIG.

  The punch slide 30 is fitted to the punch slide guide groove 17 of the set plate 10 so as to be movable in the direction of contact with and away from the central axis L on the radially inner side of the peripheral wall 107 of the cylindrical workpiece 100 to be set. 17a and the bottom surface 31b slidingly contact the guide bottom surface 17b, the bottom surface 31b, the top surface 31c, the front end surface 31d, and the end of the both side surfaces 31a on the side of the central axis L, protrudes in a tapered shape and gradually protrudes and the set plate 10 A rear end surface projecting into the opening 11 is formed in a block shape having a rectangular cross section in which a punch driven cam surface 32 inclined so as to approach the central axis L as it moves downward from above. A piercing punch 33 is provided on the front end surface 31d of the punch slide 30 to pierce the peripheral wall 107 of the cylindrical workpiece 100 in cooperation with the piercing die 28. A urethane stripper 35 formed in a cylindrical shape by an elastic member such as urethane is attached to the piercing punch 33 that also serves as the second pressing member. A punch driven cam surface 32 is formed coaxially with the axis of the piercing punch 33.

  Further, the punch slide 30 is formed with a cam return insertion hole 34 having a punch return driven cam surface 34a that penetrates from the bottom surface 31b to the top surface 31c and gradually moves away from the central axis L as it moves from below to above. ing. The inclination angle of the punch return driven cam surface 34a that gradually moves away from the central axis L as it moves from the lower side to the upper side with respect to the inclination angle of the punch driven cam surface 32 that gradually moves away from the central axis L as it moves from the lower side to the upper side. It is set large.

  The cam return 40 is slidably fitted into the opening 11 of the set plate 10 and protrudes radially from the upper portion of the main body 41 so as to be movably fitted into the cam return insertion slit 17c. A substantially triangular cam return driver 42 having a punch return drive cam surface 42a that can be inserted into a cam return insertion hole 34 formed in the punch slide 30 from below and slidably contact the punch return driven cam surface 34a. Prepare. The cam return 40 is held so that it can be raised and lowered between a raised position where each punch return driving cam surface 42a of the cam return driver 42 is pressed against the punch return cam surface 34a and a lowered position retracted from the cam return insertion hole 34. At the same time, it is biased toward the lifted position by an actuator 44 such as a gas spring or a tanker cylinder that biases the lifted position. In addition, a protrusion 43 that is pressed by the tip 63 of the punch driver 60 is provided on the upper portion of the main body 41.

  The first give plate 45 abuts the opening 45 a that allows the punch driver 60 to be inserted, the lower surface 45 b that can abut on the upper surface 31 c of each punch slide 30, the stepped portion 105 of the cylindrical workpiece 100, and the tapered portion 106. A punch having a disc shape having a possible upper surface 45c, which is fixed to the top portion 17a of the inner partition wall 17 and the top portion 19a of the give plate mounting portion 19 by screws or the like, and is fitted into the punch slide guide groove 17 by the lower surface 45b. The slide 30 is movably held and the set position of the cylindrical workpiece 100 is achieved by the upper surface 45c.

  The second give plate 46 has a disk shape having an opening 46a and a lower surface 46b that can be in contact with the upper surface 21c of each die slide 20, and is fixed to the top 13b of the outer partition wall 13 and is die-slided by the lower surface 46b. The die slide 20 fitted in the guide groove 15 is movably held, and the stopper 24 protruding from the die slide 20 abuts on a locking portion 46d formed by the peripheral edge of the opening 46a so that the die slide 20 is brought into contact. Is held at the reverse end away from the central axis L radially outward.

  On the holder 50 attached to the slide of the press apparatus, a punch driver 60, a work presser 70, and a die driver 80 are disposed concentrically around the central axis L.

  The punch driver 60 has a flange-like base 61 attached to the lower surface 51 of the holder 50, extends downward from the base 61 and can be inserted into the opening 102 of the cylindrical workpiece 100 and the opening 45 a of the first give plate 45. A cylindrical punch driver main body 62 having a large diameter is provided, and the diameter of the punch driver main body 62 gradually decreases toward the distal end 63 side, that is, gradually approaches the central axis L as it moves toward the distal end 63 side. The punch driving cam surface 64 has a trapezoidal conical surface shape that is inclined in this manner.

  When the slide of the press device is at the top dead center position, the punch driver 60 comes out of the opening 45a of the first give plate 45, and the punch driving cam surface 64 is separated from the punch driven cam surface 32 of each punch slide 30. The tip 63 is separated from the protrusion 43 of the cam return 40. On the other hand, the cam return 40 is pushed up to the raised position by the actuator 44, and the punch return drive cam surface 42 a of each cam return driver 42 of the cam return 40 is pressed against the punch return driven cam surface 34 a of the cam return insertion hole 34. Each punch slide 30 is held at the backward end.

  Further, as the punch driver 60 is lowered, the tip 63 comes into contact with the protrusion 43 of the cam return 40 and pushes the cam return 40 against the actuator 44 so that each cam return driver 42 comes out of the cam return insertion hole 34. The forward movement of the punch slide 30 is allowed, and the punch driving cam surface 64 of the punch driver 60 comes into contact with the punch driven cam surface 32 of each punch slide 30 so that each punch driver 60 moves forward.

  The work retainer 70 has a cylindrical shape that has an opening 72 through which the punch driver 60 and the boss 101 of the tubular work 100 can pass, and extends in the vertical direction. The workpiece pressing body 71 has an annular workpiece pressing surface 73 that can be in contact with the workpiece. The workpiece pressing body 71 is preset from the raised position where the upper surface 74 contacts the lower surface 51 of the holder 50 and the lower surface 51 of the holder 50. It is attached to the holder 50 by a plurality of actuators 75 such as a gas spring and a tanker cylinder that are held so as to be able to move up and down between the lowered positions separated downward and urged to the lowered position.

  The die driver 80 has a cylindrical die driver main body 82 to which a base end 82 a is attached via a ring-shaped cam holder 81 on the lower surface of the holder 50, and a lower end of a true cylindrical inner peripheral surface 83 of the die driver main body 82. The die drive cam surface 85 has a trapezoidal conical surface and is inclined so as to gradually increase in diameter as it moves downward along the edge, that is, gradually away from the central axis L as it moves toward the tip 84 side.

  The die driver 80 is separated from the die driven cam surface 23a of each die slide 20 when the slide is at the top dead center position, and the cam surface 85 is moved along the die driven cam surface of each die slide 20 as the die driver 80 is lowered. Each die slide 20 is moved forward in a direction approaching the central axis L against the die return means 25 in contact with the die return means 25, and then the inner peripheral surface 83 is brought into sliding contact with the flat surface 23b and the die slide 20 is moved forward. The movement stops and the die slide 20 is held at the forward end.

  Next, the operation of the piercing apparatus 1 configured as described above will be described with reference to process drawings showing the main part in FIGS. 19 to 26. 19 shows the state at the raised position, FIGS. 20 and 21 show the lowered state, FIG. 22 shows the machining completed state, and FIGS. 23 to 26 show the raised state.

  Prior to the operation, the cylindrical workpiece 100 is set on the piercing apparatus 1 when the slide of the press device is at the top dead center, that is, in the raised position state shown in FIG. In this raised position state, the punch driver 60 comes out of the opening 45a of the first give plate 45, the punch driving cam surface 64 is separated from the punch driven cam surface 32 of each punch slide 30, and the tip 63 is the cam return 40. The cam return 40 is pushed up to the raised position by the actuator 44 so that the return drive cam surface 42a of each cam return driver 42 of the cam return 40 is a punch return driven cam surface of the cam return insertion hole 34. The piercing punch 33 provided on each punch slide 30 in pressure contact with the punch 34a is held at the backward end away from the inner peripheral surface 107a of the peripheral wall 107 of the cylindrical workpiece 100. The work pressing body 71 of the work pressing 70 is held at the lowered position by the actuator 75.

  The die driver 80 is held in a state of being separated from the rear end face 23 of each die slide 20, and each die slide 20 has its stopper portion 24 abutting against the engaging portion 46 d of the second give plate 46 by the die return means 25. The piercing die 28 is held at the backward end away from the outer peripheral surface 107b of the peripheral wall 107 of the cylindrical workpiece 100 on which the piercing die 28 is set. Thus, in the state where the die slide 20 and the punch slide 30 are held at the backward end, each piercing die 28 and the piercing punch 33 are in a non-contact state, and the tip 28b of the piercing die 28 and the piercing punch 33 are in contact with each other. A gap that allows insertion of the peripheral wall 107 of the cylindrical workpiece 100 is formed between the tip 33a of the cylindrical workpiece 100 and the tip 33a.

  In this state, the cylindrical workpiece 100 is fitted with the stepped portion 105 and the tapered portion 106 placed on the upper surface 45c of the first giving plate 45, and the peripheral wall 107 is opposed to the piercing die 28 and the piercing punch. The tip 107c of the peripheral wall 107 is set in a state of entering into the workpiece insertion groove 18. In a state where the cylindrical workpiece 100 is set, the peripheral wall 107, the inner peripheral surface 107a, and the workpiece insertion groove 18 are not in contact with each other, and a gap of, for example, 1.1 mm is formed.

  With the cylindrical work 100 set, the slide of the press device starts to descend. As the slide is lowered, the work pressing surface 73 of the work pressing body 71 supported by the holder 50 via the actuator 75 comes into pressure contact with the stepped portion 105 of the cylindrical workpiece 100 by the work pressing body 71 and the first give plate 45. The stepped portion 105 of the cylindrical workpiece 100 is pressed and held.

  When the slider is further lowered, the work holding body 71 is pressed against the stepped portion 105 by the actuator 75, and the stepped portion 105 of the cylindrical workpiece 100 is pressed and held by the work holding main body 71 and the first give plate 45. The die driving cam surface 85 of the die driver 80 contacts and slides against the die driven cam surface 23a of each die slide 20 so that each die slide 20 resists the die return means 25 at the same time along the die slide guide groove 15. Thus, the tip 28b of the piercing die 28 protruding from the front end face 22 of each die slide 20 is moved forward toward the central axis L, that is, closer to the outer peripheral surface 107b of the peripheral wall 107 of the cylindrical workpiece 100. The outer peripheral surface 107b of the peripheral wall 107 is pressed radially from the outer peripheral direction at equal intervals, and the peripheral wall 107 is pressed. Deformation applied to the circular shape.

  When the die drive cam surface 85 of the die driver 80 further descends abuts and slides on the die driven cam surface 23a of each die slide 20, and each die slide 20 reaches the forward end position, as shown in FIG. The contact between the die driving cam surface 85 of the die driver 80 and the die driven cam surface 23a of each die slide 20 is finished, and the inner peripheral surface 83 of the die driver 80 is brought into sliding contact with the flat surface 23b of each die slide 20. Each die driver 80 is held at the forward end.

When the slider is further lowered, the work holding body 71 is pressed against the stepped portion 105 by the actuator 75, and the state where the stepped portion 105 of the cylindrical workpiece 100 is pressed and held by the work holding body 71 and the first give plate 45 is maintained. The inner peripheral surface 83 of the driver 80 is in sliding contact with the flat surface 23 b of each die slide 20 to hold each die slider 20 at the forward end, and the tip 63 of the punch driver 60 is in contact with the protruding portion 43 of the cam return 40. each punch cam return driver 42 pushes down the cam return 40 in contact punch driven cam face 32 in contact with and slides in the punch drive cam surfaces 64 each punch slide 30 of the punch driver 60 while withdrawn from the cam return insertion hole 34 slide 30 along the punch slide guide groove 17 simultaneously away from the central axis L, The cylindrical workpiece 100 moves forward in a direction approaching the inner peripheral surface 107a of the peripheral wall 107, and the tip 33a of the piercing punch 33 and the urethane stripper 35 are stabilized at the tip 28b of each piercing die 28 as shown in FIG. The shape of the peripheral wall 107 is adjusted by pressing against the inner peripheral surface 107b of the peripheral wall 107 held in this state, and piercing is started.

  When the slider is further lowered, the workpiece holding body 71 is continuously pressed against the stepped portion 105 and the state where the stepped portion 105 of the cylindrical workpiece 100 is pressed and held by the workpiece holding body 71 and the first give plate 45 is maintained. The inner peripheral surface 83 of the die driver 20 is slidably contacted with the flat surface 23b of each die slide 20 to hold each die driver 80 at the forward end, and the tip 63 of the punch driver 60 is pressed against the protrusion 43 of the cam return 40 to thereby return the cam return. The punch drive cam surface 64 of the punch driver 60 is slidably contacted with the punch driven cam surface 32 of each punch slide 30 while the cam return driver 42 is pulled out from the cam return insertion hole 34 by depressing 40, and each punch slide 30 advances. The peripheral wall 107 is moved by the cooperation of each piercing die 28 and the piercing punch 33. The piercing hole 111 piercing from an inner peripheral surface 107a side toward the outer peripheral surface 107b side and the bottom dead center position shown in Figure 22. Here, each punch residue 112 punched out by the piercing die 28 and the piercing punch 33 is discharged out of the apparatus through the punch residue discharge hole 26 formed in each die slide 20 and the punch residue discharge hole 15c of the set plate 10. The

  When the bottom dead center position is reached and piercing is completed, the slide of the press device starts to rise. When the slider is raised, the work pressing body 71 continues to press against the stepped portion 105 and maintains the state in which the stepped portion 105 of the cylindrical workpiece 100 is pressed and held by the workpiece pressing main body 71 and the first give plate 45. With the inner peripheral surface 83 slidably contacting the flat surface 23b of each die slide 20 and holding each die driver 80 at the forward end, the pressing contact of the protrusion 43 of the cam return 40 by the tip 63 of the punch driver 60 is released. As shown in FIG. 22, the cam return 40 is lifted and biased by the actuator 44 so that each cam return driver 42 enters the cam return insertion hole 34 of each punch slide 30 and the cam surface 42a for driving the punch return is moved. It abuts on the punch return driven cam surface 34a.

  Further, when the slider is raised, the workpiece pressing body 71 continues to press against the stepped portion 105 and maintains the state in which the stepped portion 105 of the cylindrical workpiece 100 is pressed and held by the workpiece pressing main body 71 and the first give plate 45, and the die driver. With the inner peripheral surface 83 of the 80 slidably contacting the flat surface 23b of each die slide 20 and holding each die driver 80 at the forward end position, the pressing portion 43 of the cam return 40 is pressed by the tip 63 of the punch driver 60. Is released, the cam return 40 is lifted and biased by the actuator 44, and the cam return driving cam surface 42a of each cam return driver 42 is moved to the punch return driven cam surface 34a in the cam return insertion hole 34 of each punch slide 30. The punch slide 30 is moved backward to the reverse end in sliding contact. As a result, as shown in FIG. 23, each piercing die 28 and the piercing hole 111 of the peripheral wall 107 come out.

  Further, when the slider is raised, as shown in FIG. 24, the sliding contact between the inner peripheral surface 83 of the die driver 80 and the flat surface 23b of each die slide 20 is released, and the die driving cam surface 85 of the die driver 80 and The die follower cam surface 23 a of each die slide 20 comes into contact, the reverse movement starts by the urging of the die return means 25, and the workpiece pressing surface 73 of the workpiece pressing body 71 is separated from the stepped portion 105 of the cylindrical workpiece 100. The pressing and holding by the work pressing body 71 and the first giving plate 45 is released.

  Further, the slider is raised, and as shown in FIG. 25, the die return means 25 is energized in accordance with the sliding contact between the die driving cam surface 85 of the die driver 80 and the die driving cam surface 23a of each die slide 20. After that, the slide of the press device is moved up and down to the top dead center shown in FIG. 19, and the punch driver 60 comes out of the opening 45a of the first give plate 45, and the cam surface 64 for driving the punch drives each punch slide 30. This is separated from the cam surface 32 for punch driving. Further, the tip 63 is separated from the protrusion 43 of the cam return 40, the cam return 40 is pushed up to the raised position by the actuator 44, and the cam return drive cam surface 42a of each cam return driver 42 of the cam return 40 is cam return. Each punch slide 30 is held at the backward end by being pressed against the punch return driven cam surface 34a of the insertion hole 34.

  On the other hand, the die driver 80 is held in a state separated from the rear end face 23 of each die slide 20, and each die slide 20 has a stopper portion 24 abutting against a locking portion 45 d of the second give plate 45 by the die return means 25. Is held at the reverse end.

  At the top dead center position, the pierced hole 111 is formed in the peripheral wall 107 of the tubular workpiece 100, that is, the processed molded product 110 is carried out. These steps from the setting of the cylindrical workpiece 110 to the carrying out of the molded product 110 are repeated, so that the peripheral wall 107 of the cylindrical workpiece 100 and the processing of the piercing hole 111 are sequentially performed.

  According to the piercing apparatus 1 in the present embodiment, a punch provided on the front end face 31d with a piercing punch 33 that pierces the peripheral face 107 of the cylindrical workpiece 100 from the inner peripheral face 107b side toward the outer peripheral face 107a. The slide 30 abuts and slides on the punch driving cam surface 64 of the punch driver 60 in the extending direction of the piercing punch 33 in the reciprocating direction, that is, on the rear end surface coaxially or substantially coaxially in the reciprocating direction. A punch driven cam surface 32 is formed, the rotational moment acting on the punch slide 30 during piercing is extremely small, the rotational stress applied to the punch slide 30 can be set small, the required rigidity of the punch slide 30 can be suppressed, and the punch slide 30 can be suppressed. Of the cam return driver 42 for each cam return driver 42a. Since the punch slide 30 is moved backward while being in sliding contact with the punch return driven cam surface 34a in the cam return insertion hole 34 of each punch slide 30, there is a return spring or the like for moving the punch slide 30 backward after conventional piercing. Combined with the fact that the punch slide 30 is not necessary, the restriction of the punch slide 30 arranged radially is relaxed, and the piercing holes 111 that are pierced simultaneously on the peripheral wall 107 of the cylindrical workpiece 100 can be increased. become.

  Further, as the number of punch slides 30 is increased, the number of die slides 20 arranged to face the punch slides 30 is increased, and a large number of piercing dies 28 arranged radially at equal intervals along with the punching process are arranged on the outer peripheral surface of the peripheral wall 107. The peripheral wall 107 generated by the flow forming is performed by pressing the 107b evenly at equal intervals and the piercing punch 33 provided on the punch slide 30 equally pressing the inner peripheral surface 107a of the peripheral wall 107 at equal intervals. Deformation such as distortion is corrected, and a highly accurate processed product is obtained.

  Further, instead of the punching die 28 and the punching punch 33, the first press forming member and the second press forming member having a flat tip are attached to the punch slide 20 and the punch slide 30 and pierced to the peripheral wall 107 of the cylindrical workpiece 100. Without processing, a cylindrical workpiece forming apparatus can be configured in which distortion of the peripheral wall 107 caused by flow forming molding or the like is deformed and corrected to obtain a highly accurate processed product.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the case where 24 piercings are performed on the peripheral wall of the cylindrical workpiece has been described as an example. However, a plurality of other piercings may be performed. Further, without providing the piercing punch and the piercing die for all the punch slides and the die slide, the piercing punch and the piercing die for the specific punch slide and the die slide that do not require the piercing hole can be omitted.

DESCRIPTION OF SYMBOLS 1 Piercing apparatus 10 Set plate 11 Opening 12 Base part 13 Outer partition 15 Die slide guide groove 15c Punch waste discharge hole 16 Inner partition 17 Punch slide guide groove 18 Workpiece insertion groove 19 Gib plate attachment part 20 Dice slide 22 Front end surface 23 Rear end surface 23a Die driven cam surface 23b Flat surface 25 Die return means 27 Die mounting portion 28 Piercing die (first press molding member)
30 Punch slide 31 Punch slide body 31d Front end surface 32 Punch driven cam surface 33 Piercing punch (second press forming member)
34 Cam return insertion hole 34a Punch return driven cam surface 40 Cam return 41 Main body 42 Punch return driver 42a Punch return drive cam surface 44 Actuator 45 First give plate 46 Second give plate 50 Holder 60 Punch driver 61 Base 62 Punch driver Body 63 Tip 64 Punch driving cam surface 70 Work holder 71 Work holding body 73 Work holding surface 75 Actuator 80 Dice driver 81 Cam holder 82 Dice driver body 82a Base end 83 Inner peripheral surface 84 Tip 85 Die drive cam surface 100 Cylindrical workpiece (Molding material)
101 Boss portion 102 Opening 103 Flange 104 Tube portion 105 Flat plate portion 106 Tapered portion 107 Peripheral wall 107a Inner peripheral surface 107b Outer peripheral surface 108 Thick portion 110 Molded product 111 Pierce hole L Center axis

Claims (6)

In a piercing apparatus that includes a lower mold and an upper mold that moves up and down along the central axis, and that pierces a plurality of pierced holes radially in the peripheral wall of the cylindrical workpiece,
The lower mold is
The cylindrical workpiece set around the central axis is arranged radially around the central axis on the outside of the peripheral wall of the cylindrical workpiece, and moves forward between a forward end approaching the central axis and a reverse end separated from the central axis. A die slide having a piercing die on the front end surface and a die driven cam surface formed on the rear end surface while reversing,
The cylindrical workpiece set around the central axis is radially arranged around the central axis inside the peripheral wall of the cylindrical workpiece, and moves forward and forward between a forward end away from the central axis and a reverse end approaching the central axis. A plurality of punch slides that move backward and have a piercing punch on the front end surface, a punch driven cam surface formed on the rear end surface, and a punch return driven cam surface;
A cam return having a cam return driver having a cam surface for punch return driving that can slide on the punch return driven cam surface formed on each punch slide;
The upper mold is
A punch driver extending downward along the central axis and having a punch driving cam surface on the outer periphery of the tip;
A die driver extending downward and having a die drive cam surface continuously formed at the tip, and
The die driving cam surface of the die driver that sequentially descends as the upper die descends slidably contacts the die driven cam surface of each die slide so that each die slide moves forward and the piercing die is a peripheral wall of the cylindrical workpiece. Press the outer peripheral surface of
The tip of the punch driver depresses the cam return to separate the punch return driving cam surface from the punch return driven cam surface, and the punch driving cam surface slides on each punch driven cam surface so that each punch slide moves forward. Each piercing punch and piercing die cooperate to pierce a pierced hole in the peripheral wall,
The cam return pressing contact by the tip of the punch driver that rises as the upper die is lifted is released, and the cam return driving cam surface of each cam return driver slides into contact with the punch return driven cam surface. piercing device of the cylindrical workpiece, characterized in that to reverse the movement of the punch slide. In a piercing apparatus that includes a lower mold and an upper mold that moves up and down along the central axis, and that pierces a plurality of pierced holes radially in the peripheral wall of the cylindrical workpiece,
The lower mold is
The cylindrical workpiece set around the central axis is arranged radially around the central axis on the outside of the peripheral wall of the cylindrical workpiece, and moves forward between a forward end approaching the central axis and a reverse end separated from the central axis. A plurality of pierced dies on the front end face that move backward, and a die driven cam face that inclines so as to move away from the central axis as it moves downward from the upper end face, and a flat surface parallel to the central axis. Dice slide
Die return means for urging the die slide toward the reverse end;
Forward and backward movement between a forward end separated from the central axis and a backward end approaching the central axis, which is radially arranged around the central axis inside the peripheral wall of the cylindrical workpiece set around the central axis. And a piercing punch is provided on the front end surface facing the front end surface of the die slide, and a punch driven cam surface is formed on the rear end surface so as to approach the central axis as it moves downward from above. A plurality of punch slides with punch return driven cam surfaces that gradually move away from the central axis as they move upward;
A cam return comprising a main body and a cam return driver having a cam surface for punch return driving that protrudes radially from the main body and is slidable in contact with a punch return driven cam surface formed on each punch slide;
An actuator for biasing the cam return upward,
The upper mold is
A punch driver having a trapezoidal conical punch driving cam surface extending downward along the central axis and gradually reducing in diameter as it moves to the distal end outer periphery;
A trapezoidal cone which is arranged in a core shape with the punch driver and extends downward along the central axis, and which gradually slopes away from the central axis as it moves to the inner circumferential surface and the tip side of the true cylinder. A die driver having a continuous die drive cam surface formed continuously,
The die drive cam surface of the die driver that descends sequentially as the upper die descends slidably contacts the die driven cam surface of each die slide, and each die slide moves forward simultaneously against the die return means to pierce. The die presses the outer peripheral surface of the peripheral wall of the cylindrical workpiece, the inner peripheral surface of the die driver is in sliding contact with the flat surface of each die slide, and each die driver is held at the forward end position,
The tip of the punch driver depresses the cam return to separate the punch return driving cam surface from the punch return driven cam surface, and the punch driving cam surface slides on each punch driven cam surface so that each punch slide moves forward simultaneously. Then, each piercing punch and piercing die cooperate to pierce the pierced hole from the inner peripheral surface side to the outer peripheral surface side of the peripheral wall,
The cam return pushing contact of the tip of the punch driver that rises as the upper die rises is released, and the cam return driving cam surface of each cam return driver slides into contact with the punch return driven cam surface to punch. Move the slide backward,
The inner peripheral surface and the die drive cam face of the die driver away from the die driven cam surface of each dice slide, piercing of the cylindrical workpiece to the die slide urged by the die return means, characterized in that the backward movement apparatus. The punch slide is
A cam return insertion hole provided with the punch return driven cam surface that gradually moves away from the central axis as it moves from below to above,
The cam return is
A cam return having the punch return driving cam surface that protrudes radially from the main body and is inserted into a cam return insertion hole formed in each punch slide from below and is slidably contacted with the punch return driven cam surface. A cylindrical work piercing apparatus according to claim 1, further comprising a screwdriver.   A plurality of cam sliders each having an opening in which the cam return is disposed and radially formed around the central axis inside the peripheral wall of the set cylindrical workpiece and slidably holding the die sliders. A plurality of die slide guide grooves and a plurality of die slide guide grooves that are continuously formed inside the peripheral wall of the set cylindrical workpiece and radially formed around the center axis so as to be slidable. The cylindrical workpiece piercing apparatus according to any one of claims 1 to 3, further comprising a set plate having a plurality of punch slide guide grooves. In a cylindrical work forming apparatus that includes a lower mold and an upper mold that moves up and down along the central axis and contacts and separates from the lower mold,
The lower mold is
The cylindrical work set around the central axis is arranged radially around the central axis on the outside of the peripheral wall of the cylindrical workpiece, and moves forward and backward between a forward end approaching the central axis and a reverse end separated from the central axis. And a plurality of die slides provided with a first pressing member on the front end surface and a die driven cam surface formed on the rear end surface;
Forward and backward movement between a forward end separated from the central axis and a backward end approaching the central axis, which is radially arranged around the central axis inside the peripheral wall of the cylindrical workpiece set around the central axis. A plurality of punch slides provided with a second pressing member on the front end surface, a punch driven cam surface formed on the rear end surface, and a punch return driven cam surface;
A cam return provided with a cam return driver having a punch return drive cam surface slidable in contact with a punch return driven cam surface formed on each of the punch slides,
The upper mold is
A punch driver extending downward along the central axis and having a punch driving cam surface on the outer periphery of the tip;
A die driver extending downward and having a die drive cam surface continuously formed at the tip;
The die driving cam surface of the die driver that sequentially descends as the upper die descends slidably contacts the die driven cam surface of each die slide so that each die slide moves forward, and the first press forming member becomes the cylindrical workpiece. Press the outer peripheral surface of the peripheral wall,
The tip of the punch driver depresses the cam return to separate the punch return driving cam surface from the punch return driven cam surface, and the punch driving cam surface slides on each punch driven cam surface so that each punch slide moves forward. The second pressing member and the first pressing member cooperate to form the peripheral wall,
The cam return pushing contact of the tip of the punch driver that rises as the upper die rises is released, and the cam return driving cam surface of each cam return driver slides into contact with the punch return driven cam surface to punch. molding apparatus of the cylindrical workpiece, characterized in that for backward move the slide. In a cylindrical work forming apparatus that includes a lower mold and an upper mold that moves up and down along the central axis and contacts and separates from the lower mold,
The lower mold is
The cylindrical work set around the central axis is arranged radially around the central axis on the outside of the peripheral wall of the cylindrical workpiece, and moves forward and backward between a forward end approaching the central axis and a reverse end separated from the central axis. In addition, the front end face is provided with a first pressing member, and the rear end face is continuously formed with a die driven cam face that inclines so as to move away from the center axis as it moves downward from above and a flat face parallel to the center axis. Dice slide
Die return means for urging the die slide toward the reverse end;
Forward and backward movement between a forward end separated from the central axis and a backward end approaching the central axis, which is radially arranged around the central axis inside the peripheral wall of the cylindrical workpiece set around the central axis. And a punch driven cam surface that is provided with a second pressing member on the front end surface facing the front end surface of the die slide, and that is inclined so as to approach the central axis as it moves downward from above. A plurality of punch slides formed with cam return insertion holes having punch return driven cam surfaces that gradually move away from the central axis as they move from below to above;
Cam return driver having a main body and a cam surface for punch return driving that protrudes radially from the main body and is inserted into a cam return insertion hole formed in each of the punch slides from below and is slidably contacted with the punch return driven cam surface A cam return comprising:
An actuator for biasing the cam return upward,
The upper mold is
A punch driver having a trapezoidal conical punch driving cam surface extending downward along the central axis and gradually reducing in diameter as it moves to the distal end outer periphery;
A trapezoid that is arranged concentrically with the punch driver and extends downward along the central axis, and is inclined so as to gradually move away from the central axis as it moves to the inner peripheral surface of the true cylinder and the tip side. A die driver in which a conical die-drive cam surface is continuously formed,
The die driving cam surface of the die driver that descends sequentially as the upper die descends slidably contacts the die driven cam surface of each die slide, and the die slides simultaneously move forward against the die return means to be moved first. The pressing member presses the outer peripheral surface of the peripheral wall of the cylindrical workpiece, the inner peripheral surface of the die driver is in sliding contact with the flat surface of each die slide, and each die driver is held at the forward end position,
The tip of the punch driver pushes down the cam return, the cam return driver is pulled out from the cam return insertion hole, the cam surface for punch driving comes into sliding contact with each punch driven cam surface, and the respective punch slides move forward at the same time as the second press. The molding member and the first press molding member cooperate to mold the peripheral wall,
The cam return pressing force by the tip of the punch driver that rises as the upper die is lifted is released, and each cam return driver returns into the cam return insertion hole of each punch slide, and the punch return drive cam The surface slides against the punch return driven cam surface and the punch slide is moved backward,
Dice driver inner peripheral surface and the die drive cam surface of the leaves the die driven cam surface of each dice slide cylindrical workpiece of the molding apparatus each die slide urged by the die return means, characterized in that the backward movement .

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