JP5400400B2 - Hydraulic molding nozzle, hydraulic molding apparatus, and hydraulic molding method - Google Patents

Description

  The present invention relates to a hydraulic forming nozzle, a hydraulic forming apparatus, and a hydraulic forming method, and in particular, a hydraulic forming nozzle having a movable core, and a hydraulic forming apparatus and a hydraulic forming method to which such a pressure forming nozzle is applied. It is about.

  There are various conflicting demands for strength parts of moving bodies such as automobiles, such that the structure and the manufacturing method are simplified, the strength is sufficient and sufficient, and the design flexibility of the shape is also increased.

  Under such circumstances, an attempt has been made to replace a general press molding method with a hydraulic molding method in which a plate material is molded using the hydraulic pressure of a pressurized fluid such as water. In such a hydraulic forming method, the end of the hydraulic forming nozzle connected to the pressurized fluid source is arranged inside the member to be processed, and the pressurized fluid is discharged from the hydraulic forming nozzle to the inside of the member to be processed. Then, in order to form the workpiece to be processed into a desired shape, the pressurized fluid discharged to the inside of the workpiece to be processed passes through the gap between the hydraulic pressure forming nozzle and the workpiece to be processed to the outside of the workpiece to be processed. It is necessary to prevent unnecessary leakage and discharge.

  In Patent Document 1, the nozzle member of the hydraulic forming nozzle is slid toward the pipe to be molded, and the seal member is pressed to be compressed and deformed, and the compression-deformed seal member is converted into the pipe to be molded. Has been proposed to prevent unnecessary discharge of the pressurized fluid.

Japanese Patent Laid-Open No. 2001-334318

  However, in the configuration proposed in Patent Document 1, the simple principle of using the operation of sliding the nozzle member of the hydraulic forming nozzle toward the pipe to be molded is used for compressive deformation of the seal member. In addition, repeatedly compressing and deforming the seal member is difficult in terms of durability of the seal member, and the entire configuration actually implemented is complicated.

  In such a configuration, the shape of the insertion end portion of the molding pipe is somewhat fixed in order that the compression-deformed seal member is brought into close contact with the inner peripheral surface in the vicinity of the insertion end portion of the molding pipe. It is necessary to manage the shape of the insertion end of the pipe for molding, except when the insertion end of the pipe for molding is used as the end of the raw pipe. It is complicated.

  In such a configuration, in order to insert the hydraulic forming nozzle into the molding pipe, it is necessary to match the shape of the hydraulic molding nozzle with the shape of the insertion end of the molding pipe, When the size of the molding pipe itself or the shape of the insertion end of the molding pipe is changed, it is necessary to change the size and shape of the insertion part of the hydraulic forming nozzle. It is difficult to evaluate even if a certain configuration is realized.

The present invention has been made after the above-described studies. The movable core is provided in the hydraulic forming nozzle, and the movable core is rotated according to the operation of the hydraulic forming nozzle entering the entry end of the workpiece. By moving the workpiece into the workpiece and press-molding the workpiece using the movable core, the end shape of the workpiece is defined to form the seal portion of the hydroforming nozzle An object of the present invention is to provide a hydraulic forming nozzle, a hydraulic forming apparatus, and a hydraulic forming method that can freely cooperate, and to suppress unnecessary discharge of pressurized fluid at the time of hydraulic forming.

In order to achieve the above object, the hydroforming nozzle according to the first aspect of the present invention is a base block to which a pressurized fluid is supplied, fixed to the base block, and abutted against the entry end of the workpiece. A seal head that freely enters, a shaft fixed to the seal head, and when the seal head enters the member to be processed, so that it can move following the shape of the entry end of the member to be processed. A movable core mounted on the shaft so as to be rotatable, and the movable core is brought into contact with the entry end portion when the seal head enters the workpiece.
After, when the processing target member is molded embossed, Ru rotatable der correspond to the molding shape of the processing target member.

In addition to the first aspect, the present invention provides a movable core that slides following the shape of the entry end of the workpiece when the seal head enters the workpiece. The second aspect is to have a cam portion to perform.

In addition to the first or second aspect, the present invention has an outer surface shape in which the movable core is entirely in contact with an inner surface of the processing target member after the processing target member is embossed. This is the third aspect.

In addition to any one of the first to third aspects, the present invention provides the first movable core that is rotatably mounted on the shaft and the shaft that is rotatable. A second movable core that is mounted, and the first movable core and the second movable core are pressed when the seal head enters the workpiece and when the workpiece is pressed. In the fourth aspect, the fourth aspect is to rotate in opposite directions.

According to the present invention, in addition to the fourth aspect, the first movable core has a first contact portion, and the second movable core has a second contact portion. The first abutting portion and the second abutting portion abut each other when the seal head enters the workpiece, and the first movable core rotates and the The fifth aspect is to restrict the rotation of the second movable core.

According to the present invention, in addition to the fourth or fifth aspect, the first movable core has a third contact portion, and the second movable core has a fourth contact. The third abutting portion and the fourth abutting portion are brought into contact with each other when the workpiece is pressed and molded, and the first movable core The sixth aspect is to restrict the rotation and the rotation of the second movable core.

Further, the present invention, in addition to any one of the first to sixth aspects, the shaft has an overhang portion, the overhang portion, when the workpiece to be processed is molded and molded, A seventh aspect is to define the shape of the member to be processed in cooperation with the movable core.

The hydraulic forming apparatus according to the eighth aspect of the present invention includes a base block to which a pressurized fluid is supplied, and a seal head that is fixed to the base block and enters the end portion of the member to be processed so as to come into contact therewith. And a shaft fixed to the seal head, and when the seal head enters the processing target member, the shaft can rotate so as to be able to move following the shape of the entry end portion of the processing target member. A hydraulic forming nozzle having a movable core attached to a shaft; a pressurized fluid supply source that supplies the pressurized fluid to the base block; and a cylinder that presses the base block toward the workpiece. When, and a push type for stamping the processing target member, the movable core, after the seal head is in contact with the entrance end and enters the processing target member, the working When the elephant member is molded embossed, it is rotatable in response to the molding shape of the processing target member.

In addition, a hydraulic molding method according to a ninth aspect of the present invention includes a base block to which a pressurized fluid is supplied, and a seal head that is fixed to the base block and enters a processing target member in an abutment manner. And a shaft fixed to the seal head, and when the seal head enters the processing target member, the shaft can rotate so as to be able to move following the shape of the entry end portion of the processing target member. A step of preparing a hydraulic forming nozzle having a movable core attached to a shaft; a step of placing the processing target member on a pressing die; and the hydraulic forming nozzle advances toward the processing target member The movable core is rotated while moving in accordance with the shape of the entry end portion of the processing target member to enter the processing target member, and the seal head is moved into the entry end of the processing target member. A step of abutting the workpiece, a step of pressing the processing target member with the pressing die in a state where the movable core has entered the processing target member, and the processing target member embossed with the pressing die. Supplying a pressurized fluid to the inside of the movable core, wherein the movable core is pressed by the workpiece after the seal head enters the workpiece and contacts the entry end. When being molded, corresponding to the molding shape of the workpiece
It can rotate freely.

According to the configuration in the first aspect of the present invention, the hydroforming nozzle has a movable core attached to the shaft so as to be rotatable so as to be able to move following the shape of the entry end of the workpiece. At the same time, when the workpiece is preliminarily embossed and press-molded, the movable core can be rotated in accordance with the molding shape of the workpiece, so that the movable core is reliably It can enter the inside of the member to be processed, and can actually function as a core in the press molding that is performed preliminarily before the hydraulic molding. Therefore, by using this movable core to perform preliminary press molding on the workpiece, a substantial seal portion between the hydraulic forming nozzle and the workpiece can be secured widely and reliably. It is possible to suppress unnecessary discharge of the pressurized fluid at the time of hydraulic molding , and the pressing process can be performed reliably, and a substantial seal portion between the hydraulic nozzle and the member to be processed is provided. Can be obtained more reliably.

Moreover, according to the structure in the 2nd aspect of this invention, a movable core can enter the inside of a process target member more reliably because a movable core has a cam part.

In addition, according to the configuration of the third aspect of the present invention, the movable core has an outer surface shape that entirely contacts the inner surface of the processing target member after the press molding, so that the hydroforming nozzle and the processing target member The substantial seal portion between the two can be obtained in an appropriate state more reliably.

Further, according to the configuration of the fourth aspect of the present invention, the movable core rotates in the reverse rotation direction when the hydraulic forming nozzle enters the workpiece and when the workpiece is pressed. By having the first movable core and the second movable core that move, the movable core can be rotated in a smaller rotation range, and the movable member can enter the workpiece target member. Thus, it is possible to make the stamping during press molding simpler and more reliable.

Further, according to the configuration of the fifth aspect of the present invention, the first abutting portion of the first movable core and the second abutting portion of the second movable core are processed by the hydraulic pressure forming nozzle. When entering the target member, the hydroforming nozzle is processed in a more stable posture by abutting each other and restricting the rotation of the first movable core and the second movable core. It is possible to enter the inside of the target member.

Further, according to the configuration of the sixth aspect of the present invention, the third contact portion of the first movable core and the fourth contact portion of the second movable core are pressed by the workpiece to be processed. When press molding is performed, the first movable core and the second movable core are prevented from rotating by being brought into contact with each other, so that the preliminary molding before the hydraulic molding is more reliably performed. Pressing can be performed.

Further, according to the configuration of the seventh aspect of the present invention, when the projecting portion of the shaft is press-molded by pressing the workpiece, the molded shape of the workpiece is cooperated with the movable core. By defining the above, it is possible to obtain a substantial seal portion between the hydroforming nozzle and the member to be processed in a wide range with higher accuracy.

Moreover, according to the structure in the 8th or 9th aspect of this invention, while being able to suppress the unnecessary discharge | emission of the pressurized fluid at the time of hydraulic forming , a press process can be made | formed reliably, and a hydraulic nozzle and It is possible to obtain a hydraulic molding apparatus or a hydraulic molding method that can more reliably obtain a substantial seal portion between the workpiece .

It is a top view of the hydroforming nozzle in the embodiment of the present invention. It is a side view of the hydroforming nozzle in this embodiment. FIG. 2 is a view taken in the direction of arrow X1 in FIG. 1. FIG. 2 is a view taken in the direction of arrow X2 in FIG. 1. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. FIGS. 7A and 7B are enlarged cross-sectional views taken along the line C-C in FIG. 1. FIG. 7A shows a case where the movable core is in the initial position, and FIG. 7B shows a case where the movable core is in the upper limit position. FIGS. 8A and 8B are enlarged cross-sectional views taken along the line D-D in FIG. 1. FIG. 8A illustrates a case where the movable core is in the initial position, and FIG. 8B illustrates a case where the movable core is in the upper limit position. FIG. 5 is a partial cross-sectional view showing a state in which the hydraulic forming nozzle in the present embodiment is opposed to a workpiece to be processed set in a mold with a configuration in which a pressurized fluid source and a hydraulic cylinder are connected. FIG. 10 is a view taken in the direction of arrow X3 in FIG. 9, and the hydroforming nozzle is indicated by an imaginary line for convenience. In this embodiment, it is a partial cross section figure which shows the state which the hydraulic forming nozzle which connected the pressurized fluid source and the hydraulic cylinder approached in the process target member set to the type | mold. FIG. 12 is a view taken in the direction of arrow X3 in FIG. 11, and the hydroforming nozzle is indicated by an imaginary line for convenience. In this embodiment, a state in which the upper die is lowered to the lower die while the hydraulic pressure forming nozzle connected with the pressurized fluid source and the hydraulic cylinder further enters the member to be processed set in the die. FIG. FIG. 14 is a view taken in the direction of arrow X3 in FIG. 13, and the hydroforming nozzle is indicated by an imaginary line for convenience. In the present embodiment, the hydraulic forming nozzle that connects the pressurized fluid source and the hydraulic cylinder further enters the workpiece to be processed set in the die while the upper die is lowered to the lower die, and the hydraulic forming is performed. It is a partial cross section figure which shows the state which the seal part of the nozzle contact | abutted to the edge part of the process target member. FIG. 16 is a view taken in the direction of the arrow X3 in FIG. FIGS. 17A and 17B are views showing a molded product formed by hydraulic molding using the hydraulic molding nozzle in the present embodiment, FIG. 17A showing a top view of the molded product, and FIG. 17B showing a side view of the molded product. FIG. 17 (c) is a view taken in the direction of arrow X4 in FIG. 17 (a).

  Hereinafter, a hydraulic forming nozzle according to an embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In the figure, the x-axis, y-axis, and z-axis form a three-axis orthogonal coordinate system. Further, the y-axis direction is the width direction, and the z-axis direction is the vertical direction.

FIG. 1 is a top view of a hydraulic forming nozzle in the present embodiment, and FIG. 2 is a side view of the hydraulic forming nozzle in the present embodiment. 3 is a view taken in the direction of arrow X1 in FIG. 1, and FIG. 4 is a view taken in the direction of arrow X2 in FIG. 5 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 6 is a cross-sectional view taken along the line BB in FIG.

  As shown in FIGS. 1 to 6, the hydraulic forming nozzle 1 extending in the x-axis direction is a base block 10 to which a pressurized fluid is supplied, and a processing that is fixed to the base block 10 and is a cylindrical member. And a seal head 30 that is capable of entering the inside of the processing target member while being in contact with the entrance end of the target member. Further, the seal head 30 rotates so that the shaft 50 fixed to the seal head 30 and the seal head 30 can move following the shape of the entry end portion of the processing target member when the seal head 30 enters the processing target member. A first movable core 70 and a second movable core 90, which are freely mounted on the shaft 50, are provided. The base block 10 and the seal head 30 are not limited to being configured as separate members, and may be integrally configured as the same member as long as they have these functions.

  Specifically, the base block 10 is made of metal such as iron, and has a pressurized fluid communication hole 12 that extends in the z-axis direction and can communicate with a pressurized fluid source described later. In the base block 10, the pressurized fluid communication hole 12 communicates with the liquid passage 14 extending in the x-axis direction, and the pressurized fluid supplied from the pressurized fluid source passes through the pressurized fluid communication hole 12. After being supplied, it can be introduced into the liquid passage 14.

  The base block 10 further includes a seal head coupling hole 16 extending in the x-axis direction, a hydraulic cylinder coupling hole 18 extending in the x-axis direction, and a fastening hole 20. A seal head 30 is coupled to the seal head coupling hole 16, and a hydraulic cylinder described later is coupled to the hydraulic cylinder coupling hole 18. The fastening hole 20 is used for fastening the seal head 30 to the base block 10. The direction in which the pressurized fluid communication hole 12 extends is not limited to the z-axis direction as long as it communicates with the liquid passage 14 without interfering with the seal head coupling hole 16 and the hydraulic cylinder coupling hole 18. .

  The seal head 30 is made of a metal such as iron, and a liquid path 32 that communicates with the liquid path 14 of the base block 10, a communication liquid path 34 that communicates with the liquid path 32, and the seal head 30 are fastened to the base block 10. A fastening member insertion hole 36 into which a fastening member such as a bolt is inserted, and a coupling portion 38 coupled to the seal head coupling hole 16 of the base block 10. The liquid passage 32 and the communication liquid passage 34 extend coaxially with the liquid passage 14 of the base block 10.

  The seal head 30 further includes a shaft coupling hole 40, a seal portion 42, and a small diameter portion 44. The shaft 50 is coupled to the shaft coupling hole 40. The seal portion 42 includes an outer surface of the small-diameter portion 44 and a vertical surface that rises from the small-diameter portion 44 and extends perpendicularly to the general surface of the seal head 30, and abuts against an end portion of the workpiece to be described later. It is possible to seal the inside of the liquid. The small-diameter portion 44 has an outer shape that is consistent with the outer shape of the first movable core 70 and the outer shape of the second movable core 90, and has a hexagonal cross section with respect to the yz plane. Have

  In such a seal head 30, the coupling portion 38 is inserted into the seal head coupling hole 16 of the base block 10 and aligned with the base block 10 in the z-axis direction, and the position of the fastening member insertion hole 36 is fastened to the base block 10. In a state of being aligned with the hole 20, the fastening member is fixed to the base block 10 by being screwed into the fastening hole 20 of the base block 10 while being inserted into the fastening member insertion hole 36. The pressurized fluid introduced into the liquid passage 14 via the pressurized fluid communication hole 12 of the base block 10 can be introduced into the communication liquid passage 34 via the liquid passage 32 of the seal head 30.

  Here, in order to make the mounting state of the base block 10 and the seal head 30 more reliable, an O-ring 45 is provided between the seal head coupling hole 16 of the base block 10 and the coupling portion 38 of the seal head 30. Provided.

  The shaft 50 is made of metal such as iron, and a liquid path 52 communicating with the communication liquid path 34 of the seal head 30, a nozzle 54 serving as a discharge end of the liquid path 52, and the liquid path 52 having an x-axis inside. A cylindrical shaft body 56 extending in the direction to the nozzle 54, a shaft end portion 58 attached to the shaft body 56, a coupling portion 60 coupled to the shaft coupling hole 40 of the seal head 30, and a shaft And an overhanging portion 62 extending upward from the main body 56 while extending in the width direction. Here, the shaft end portion 58 can be fixed to the shaft main body 56 so as to cover the shaft main body 56 from the outside by a structure such as fitting or screwing. Of course, if necessary, the shaft end portion 58 may be configured as the same member instead of being configured as a separate member from the shaft main body 56. The liquid path 52 and the nozzle 54 extend in the x-axis direction coaxially with the liquid path 32 and the communication liquid path 34 of the seal head 30.

  The first movable core 70 includes a fitting portion 72 that is rotatably fitted to the shaft body 56 of the shaft 50, a cam portion 74 that is slidable in contact with the entry end portion of the processing target member, Have The second movable core 90 includes a fitting portion 92 that is rotatably fitted to the shaft body 56 of the shaft 50, a cam portion 94 that is slidable in contact with the entry end portion of the processing target member, Have Here, the cam portion 74 of the first movable core 70 and the cam portion 94 of the second movable core 90 are parallel to the xz plane and pass through a central axis extending in the x-axis direction of the shaft 50. This is a portion having a symmetric shape and having a receding angle toward the negative direction of the x axis when observed in a direction perpendicular to the paper surface of FIG. Further, the fitting portion 92 of the second movable core 90 is located on the positive side of the x axis with respect to the fitting portion 72 of the first movable core 70.

  In order to mount the first movable core 70 and the second movable core 90 on the shaft 50, first, the shaft main body 56 in a state where the shaft end portion 58 is not mounted is attached to the shaft main body 56 from the nozzle 54 side. After the fitting portion 72 of the movable core 70 is fitted and moved to the overhanging portion 62 side, and the fitting portion 92 of the second movable core 90 is continuously fitted in the same manner, the shaft end portion 58 is moved. Attached to the shaft body 56 and fixed. Next, the coupling portion 60 of the shaft 50 in the state where the first movable core 70 and the second movable core 90 are mounted in this manner is inserted into the shaft coupling hole 40 of the seal head 30 to be inserted into the seal head 30. On the other hand, the shaft 50 is fixed to the seal head 30 by screwing or the like while being aligned in the z-axis direction.

  Then, after the pressurized fluid introduced into the communication liquid passage 34 of the seal head 30 is introduced into the liquid passage 52 of the shaft 50, the pressurized fluid is discharged from the nozzle 54, which is the discharge end of the liquid passage 52, inside the processing target member. It can be discharged to the target area. Further, the communication liquid path 34 of the seal head 30 has an inner diameter gradually larger than that of the liquid path 32, so that the introduction of the pressurized fluid into the liquid path 52 of the shaft 50 is made more reliable.

  Next, detailed configurations of the projecting portion 62 of the shaft 50, the first movable core 70, and the second movable core 90 will be specifically described with reference to FIGS.

  7 is an enlarged cross-sectional view taken along the line CC in FIG. 1. FIG. 7A shows a case where the movable core is in the initial position, and FIG. 7B shows that the movable core is in the upper limit position. Show the case. 8 is an enlarged sectional view taken along the line DD of FIG. 1. FIG. 8 (a) shows a case where the movable core is at the initial position, and FIG. 8 (b) shows a case where the movable core is at the upper limit position. Shows the case.

As shown typically in FIG. 7, the projecting portion 62 of the shaft 50 extends in the x-axis direction from an upper portion 62a having an upper plane parallel to the xy plane and both sides in the width direction of the upper portion 62a. The columnar shaft main body 56 has a first slanted portion 62b and a second slanted portion 62c respectively connected to the outer surface of the columnar.

  The first movable core 70 has an outer surface parallel to the xy plane when viewed at the initial position, as shown typically in FIGS. 7 and 8, in addition to the fitting portion 72 and the cam portion 74. It has a lower part 70a and an upper part 70b that are flat surfaces, and further has a lower oblique part 76 and an upper oblique part 78 that communicate between the lower part 70a and the upper part 70b by forming a ridge line R on the outer side in the width direction. Both the lower oblique portion 76 and the upper oblique portion 78 are planes whose outer surfaces intersect the xy plane when viewed at the initial position. That is, when viewed at the initial position, the outer surface of the lower inclined portion 76 is an inclined surface that expands the width of the first movable core 70 in the positive direction of the z axis, and the outer surface of the upper inclined portion 78 is the z axis. It is the slope which reduces the width | variety of the 1st movable core 70 toward the positive direction.

  Here, a cam portion 74 having a receding angle is provided in a portion of the first movable core 70 on the positive direction side of the x-axis, and the cam portion 74 also has a lower inclined portion 76 and an upper inclined portion. The part 78 and the ridgeline R formed by them extend.

  Similarly, the second movable core 90 has an outer surface that is xy when viewed in the initial position, as shown typically in FIGS. 7 and 8, in addition to the fitting portion 92 and the cam portion 94. It has a lower part 90a and an upper part 90b which are planes parallel to the plane, and further has a lower oblique part 96 and an upper oblique part 98 that communicate with each other by forming a ridge line R between the lower part 90a and the upper part 90b on the outside in the width direction. . Both the lower oblique portion 96 and the upper oblique portion 98 are planes whose outer surfaces intersect the xy plane when viewed at the initial position. That is, when viewed at the initial position, the outer surface of the lower inclined portion 96 is an inclined surface that expands the width of the second movable core 90 toward the positive direction of the z axis, and the outer surface of the upper inclined portion 98 is the z axis. This is a slope that reduces the width of the second movable core 90 in the positive direction.

  Here, on the positive direction side of the x-axis, the second movable core 90 has a cam portion 94 having a receding angle, but the lower inclined portion 96 and the upper inclined portion 98 and the ridgeline R formed by them. Extends also in the cam portion 94.

  Further, as shown in FIG. 7, the first movable core 70 has a concave portion 70 c that is recessed in the width direction in order to prevent interference with the protruding portion 62 at a position corresponding to the protruding portion 62 of the shaft 50. And a contact portion 70d connected to the lower portion 70a on the inner side in the width direction. The remaining portion on the inner side in the width direction of the first movable core 70 at a position corresponding to the projecting portion 62 of the shaft 50 has a shape that is consistent with the shape of the shaft main body 56 of the shaft 50.

  Similarly, the second movable core 90 has a concave portion 90c whose inner side in the width direction is recessed inward in order to prevent interference with the protruding portion 62 at a position corresponding to the protruding portion 62 of the shaft 50, and There is a contact portion 90d that is continuous with the lower portion 90a on the inner side in the width direction. Note that the remaining portion on the inner side in the width direction of the second movable core 90 at a position corresponding to the projecting portion 62 of the shaft 50 has a shape that is consistent with the shape of the shaft main body 56 of the shaft 50.

  Further, as shown in FIG. 8, in the position corresponding to the fitting portion 72, the first movable core 70 is connected to the outer surface of the lower portion 70 a in contact with the cylindrical outer surface of the fitting portion 72. 70 b is continuous with the inwardly abutting portion 70 e, and the outer surface of the abutting portion 70 e is continuous with the cylindrical outer surface of the fitting portion 72. In such a position, the second movable core 90 has a contact portion 90e that is recessed inward from the upper portion 90b and is continuous, and the remaining portion on the inner side in the width direction is the fitting portion of the first movable core 70. The shape is consistent with the shape of 72.

  In addition, in the position corresponding to the fitting part 92 of the 2nd movable core 90, while the 1st movable core 70 has the contact part 70e, the remaining part is 2nd movable. It has a shape that is consistent with the shape of the fitting portion 92 of the core 90. In such a position, it goes without saying that the second movable core 90 also has a contact portion 90e.

  In the first movable core 70 having such a configuration, the fitting portion 72 is rotatable around the shaft main body 56 extending in the x-axis direction of the shaft 50, and the second movable core 90 is fitted. The mounting portion 92 is rotatable around a shaft main body 56 extending in the x-axis direction of the shaft 50.

  As shown in detail in FIGS. 7A and 8A, the first movable core 70 and the second movable core 90 have the first movable core 70 in the initial position. The contact portion 70d and the contact portion 90d of the second movable core 90 are in contact with each other, and the outer surface of the lower portion 70a of the first movable core 70 and the outer surface of the lower portion 90a of the twenty-first movable core 90 are the same. It is maintained at the lower limit position aligned on the plane and does not fall below this state. At the same time, the outer surface of the upper portion 70b of the first movable core 70 and the outer surface of the upper portion 90b of the second movable core 90 and the upper plane of the upper portion 62a of the projecting portion 62 of the shaft 50 are on the same plane. Align.

  In addition, the upper limit position shown in detail in FIGS. 7B and 8B is such that the first movable core 70 rotates from the initial position so as to be clockwise in FIG. In addition, the second movable core 90 is realized by rotating from the initial position so as to be counterclockwise in FIG. 7A, and returning from the upper limit position to the initial position. The first movable core 70 may be rotated counterclockwise, and the second movable core 90 may be rotated clockwise.

  At the upper limit position, the contact portion 70e of the first movable core 70 and the contact portion 90e of the second movable core 90 are in contact with each other, and do not rise above this state. When the contact portion 70e of the first movable core 70 and the contact portion 90e of the second movable core 90 are in contact with each other, a part of the recess 70c of the first movable core 70 is A part of the concave portion 90 c of the second movable core 90 contacts the second inclined portion 62 c of the protruding portion 62 of the shaft 50, and comes into contact with the first inclined portion 62 b of the protruding portion 62 of the shaft 50.

  In addition, the shape of the overhang | projection part 62 of the shaft 50, the 1st movable core 70, and the 2nd movable core 90 is not limited, It respond | corresponds to the desired shape obtained after shaping | molding of a process target member. Can be set as appropriate. Further, the movable core is not limited to the two-member configuration having the first movable core 70 and the second movable core 90, and the entry position to the processing target member is used as the processing target member. On the other hand, if the eccentricity is made in the width direction, the structure may be one member, or the number of components may be increased and three or more members may be arranged in the z-axis direction. It does not matter.

  Next, a method of applying the hydraulic forming nozzle 1 having the above configuration to a member to be processed and forming the member to be processed into a desired shape will be described in detail with reference to FIGS. 9 to 16. .

FIG. 9 is a partial cross-sectional view showing a state in which the hydraulic forming nozzle in the present embodiment is connected to a pressurized fluid source and a hydraulic cylinder and is opposed to a workpiece to be processed set in a mold. 10 is a view taken in the direction of arrow X3 in FIG. 9, and the hydraulic pressure forming nozzle is indicated by an imaginary line for convenience. FIG. 11 is a partial cross-sectional view showing a state in which the hydraulic forming nozzle in which the pressurized fluid source and the hydraulic cylinder are connected enters the member to be processed set in the mold in this embodiment. Fig. 11 is a view taken in the direction of arrow X3 in Fig. 11, and the hydraulic pressure forming nozzle is indicated by an imaginary line for convenience. FIG. 13 shows that, in this embodiment, the upper die is lowered to the lower die in a state in which the hydraulic forming nozzle connecting the pressurized fluid source and the hydraulic cylinder further enters the workpiece to be processed set in the die. FIG. 14 is a partial cross-sectional view showing the state, and FIG. 14 is a view taken in the direction of arrow X3 in FIG. FIG. 15 shows that in this embodiment, the hydraulic forming nozzle that connects the pressurized fluid source and the hydraulic cylinder further enters the workpiece to be processed set in the die while the upper die is lowered to the lower die. FIG. 16 is a partial cross-sectional view showing a state in which the seal portion of the hydraulic forming nozzle is in contact with the end of the member to be processed. FIG. 16 is a view taken along arrow X3 in FIG. Shown with imaginary lines for convenience.

  First, as shown in FIGS. 9 and 10, the pressurized fluid source S is connected to the pressurized fluid communication hole 12 of the base block 10, and the hydraulic cylinder 100 of the hydraulic cylinder 100 is connected to the hydraulic cylinder coupling hole 18 of the base block 10. A hydroforming nozzle 1 is prepared in which the coupling portion 102 is connected by screwing or the like. On the other hand, a metal mold such as aluminum, typically having a cylindrical shape, is formed on the inner side of a pressing mold comprising an upper mold 200 having processed surfaces C1 and C2 and a lower mold 300 having processed surfaces C3 and C4. The target member 400 is accommodated.

  In such a state, the hydraulic molding nozzle 1 and the pressing mold composed of the upper mold 200 and the lower mold 300 are connected to the first movable core 70 and the second movable core 90 of the hydraulic molding nozzle 1. It is made to oppose so that it may respond | correspond to the cylindrical inner hole of the workpiece 400 accommodated in the pressing die which consists of the type | mold 200 and the lower mold | type 300. Note that the volume of the mold cavity portion to be defined by the machining surface C1 and the machining surface C3 is smaller than the volume of the mold lumen portion to be defined by the machining surface C2 and the machining surface C4. The hydraulic forming nozzle 1, the pressurized fluid source S, the hydraulic cylinder 100, and the pressing die having the upper die 200 and the lower die 300 constitute a hydraulic forming device 500.

  At this time, the first movable core 70 and the second movable core 90 are in the initial position. That is, the contact portion 70d of the first movable core 70 and the contact portion 90d of the second movable core 90 are in contact with each other, and the outer surface of the lower portion 70a of the first movable core 70 and the twenty-first portion. The outer surface of the lower part 90a of the movable core 90 is maintained at the lower limit position aligned on the same plane and does not fall below this state.

  Next, as shown in FIGS. 11 and 12, the hydraulic cylinder 100 is actuated to extend the coupling portion 102, and the hydraulic forming nozzle 1 is moved in the X3 direction facing the positive direction of the x axis. It is made to approach into the cylindrical inner hole of the workpiece 400 accommodated in the pressing die. Then, since the cam portion 74 of the first movable core 70 and the cam portion 94 of the second movable core 90 have a receding angle with respect to the X3 direction, the cam portion 74 and the cam portion 94 are mainly used. The portion of the ridge line R abuts on the entry end portion 400e of the workpiece 400 and can slide while following the shape of the entry end portion 400e. Correspondingly, the first movable core 70 and the second moveable core 70 can be slid. The movable core 90 rotates upward. Here, when the first movable core 70 and the second movable core 90 are rotated, the outer envelope of the remaining portions other than the cam portion 74 and the cam portion 94 is in the cylinder of the workpiece 400. There is no unnecessary interference with the inner surface of the hole.

  Then, before the seal portion 42 in the seal head 30 of the hydraulic forming nozzle 1 comes into contact with the entry end portion 400e of the workpiece 400, the operation of the hydraulic cylinder 100 is temporarily stopped, and the hydraulic forming nozzle 1 is moved. The first movable core 70 and the second movable core 90 are maintained in a state where they completely enter the cylindrical bore of the workpiece 400. Here, the first movable core 70 and the second movable core 90 are arranged at positions corresponding to the machining surface C1 and the machining surface C3, respectively.

  At this time, the first movable core 70 and the second movable core 90 are at the upper limit position. That is, the contact portion 70e of the first movable core 70 and the contact portion 90e of the second movable core 90 are in contact with each other, and do not rise above this state. Here, the rotation angle from the initial position of the first movable core 70 and the second movable core 90 is less than 90 degrees.

Next, as shown in FIGS. 13 and 14, the upper mold 200 is lowered with respect to the lower mold 300 and pressed with the pressing force Z <b> 1. Then, the processing target member 400 accommodated inside the pressing mold composed of the upper mold 200 and the lower mold 300 is pressed and pressed, and when the pressing is completed with a predetermined pressing stroke, the processed surface Preliminarily corresponding to the mold shape defined by the end surface 400a, which is preliminarily formed corresponding to the mold shape defined by C1 and the machining surface C3, and the machining surface C2 and the machining surface C4. A workpiece 400 ′ having a molded main body 400b is obtained.

  At this time, the first movable core 70 and the second movable core 90 of the hydraulic pressure forming nozzle 1 entering the cylindrical inner hole of the processing target member 400 are molded by pressing the processing target member 400. As the upper inclined portion 78 and the upper inclined portion 98 are pressed, the rotational force is received, and the rotational force is rotated from the upper limit position toward the initial position. Return.

  Here, in such an initial position, the outer surface shape defined by the cooperation of the first movable core 70 and the second movable core 90 is the processing surface in consideration of the plate thickness of the processing target member 400. Since it is set to have a shape matched with the mold shape defined by C1 and the processing surface C3, when pressing is completed with a predetermined pressing stroke, the lower portion of the first movable core 70 The outer surfaces of 70a, upper portion 70b, lower inclined portion 76 and upper inclined portion 78 and the lower surfaces 90a, upper portion 90b, lower inclined portion 96 and upper inclined portion 98 of the second movable core 90 are processed members 400. It functions as a push-type core composed of the upper mold 200 and the lower mold 300. Therefore, in the obtained workpiece 400 ′, unnecessary deformation at the end portion 400a formed by the processed surface C1 and the processed surface C3 is prevented, and a desired preliminary formed shape can be obtained. It is done.

  Further, at this time, in particular, since the overhanging portion 62 of the shaft 50 is overlapped with the entry end portion 400e of the workpiece 400, the first entry portion 400e and the vicinity thereof are the first. Of the lower part 70a, the upper part 70b, the lower oblique part 76 and the upper oblique part 78 of the movable core 70, and the lower part 90a, the upper part 90b, the lower oblique part 96 and the upper oblique part 98 of the second movable core 90. In addition to the outer surfaces, the upper plane of the upper portion 62a of the overhang portion 62 is disposed.

  That is, at the entry end portion 400e of the workpiece 400, the outer surfaces of the lower portion 70a, the upper portion 70b, the lower inclined portion 76, and the upper inclined portion 78 of the first movable core 70, and the lower portion of the second movable core 90. 90a, the upper part 90b, the outer surfaces of the lower inclined part 96 and the upper inclined part 98, and the upper flat surface of the upper part 62a of the projecting part 62 of the shaft 50 are present as core surfaces having no unnecessary recesses, etc. When the pressing of 400 is completed, the entry end portion 400e and the vicinity thereof have a desired preliminary molding shape with higher accuracy.

  Next, as shown in FIGS. 15 and 16, the hydraulic cylinder 100 is operated again to extend the coupling portion 102, and the hydraulic forming nozzle 1 is moved in the X3 direction facing the positive direction of the x axis. Then, it is made to enter into the cylindrical inner hole of the workpiece 400 ′ accommodated in the pressing die and preformed. Here, the small-diameter portion 44 of the seal head 30 has an outer contour that matches the outer contour excluding the contact portion 70e of the first movable core 70 and the outer contour other than the contact portion 90e of the second movable core 90. Therefore, entry of the hydroforming nozzle 1 is not hindered.

  And if the seal part 42 in the seal head 30 of the hydroforming nozzle 1 contacts the entry end part 400e of the workpiece 400 ', the coupling part 102 of the hydraulic cylinder 100 is maintained in that position. In such a state, a pressurized fluid such as water is supplied from the pressurized fluid source S to the hydroforming nozzle 1, and the pressurized fluid is discharged from the nozzle 54 of the shaft 50 into the cylindrical bore of the workpiece 400 ′. Thus, in the member to be processed 400 ′, in particular, a part other than the processed surface C1 and the processed surface C3 is subjected to hydraulic forming to obtain a molded product P having the end portion 400a and the main body portion 400b ′.

At this time, in the processing target member 400 ′, in particular, since the entrance end portion 400e and the vicinity thereof have an accurate preliminary shape, only the seal portion 42 in the seal head 30 of the hydraulic pressure forming nozzle 1 is used. First, the portion from the seal portion 42 to the overhang portion 62 of the shaft 50 and the corresponding portions of the first movable core 70 and the second movable core 90 can function as a substantial seal portion, and the molded product P Suppresses unnecessary discharge of pressurized fluid until it is obtained.

  Next, the configuration of the molded product P obtained by the above hydraulic molding will be further described in detail with reference to FIG.

  FIG. 17 is a diagram showing a molded product that has been hydraulically molded using the hydraulic molding nozzle in the present embodiment. FIG. 17A shows a top view of the molded product, and FIG. The side view of a molded product is shown, and FIG.17 (c) is a X4 arrow line view of Fig.17 (a).

  As shown in FIG. 17 (a) to FIG. 17 (c), a molded product P obtained by hydraulic molding has an end portion 400a having a small cross section, and a main body portion 400b ′ having a larger cross section than the end portion 400a, It is a cylindrical member which has. Here, the shape of the end portion 400a is such that the first movable core 70 and the second movable core 90 of the hydraulic molding nozzle 1 are preliminarily molded during the preliminary molding of the workpiece 400 before the hydraulic molding. The shape of the preliminary press molding obtained as a result of functioning as a core is substantially maintained as it is. On the other hand, the shape of the main body 400b ′ is further applied by hydraulic molding to the shape of the main body 400b obtained when the workpiece 400 is preliminarily press-molded before the hydraulic molding. This is a shape obtained by adding a shape change.

  As described above, the molded product P includes a cross-sectional portion having a precise shape obtained by preliminary press molding before hydraulic molding, and a cross-sectional portion having a shape with high molding freedom obtained by hydraulic molding. And a cylindrical member whose end portion is a small cross-sectional portion. If necessary, the end portion is a large cross-sectional portion, while the main body portion is a small cross-sectional portion, or a cylindrical member having a structure in which the small cross-sectional portion and the large cross-sectional portion are continuously formed is formed as appropriate. Is also possible.

As described above, according to the configuration of the present embodiment, the hydraulic forming nozzle has a movable core attached to the shaft so as to be rotatable so as to be able to move following the shape of the entry end portion of the processing target member . When the workpiece is preliminarily embossed and press-molded, the movable core can be rotated in accordance with the molding shape of the workpiece, so that the movable core can be reliably processed. It can enter the inside of the target member, and can actually function as a core in the press molding performed preliminarily before the hydraulic molding. Therefore, by using this movable core to perform preliminary press molding on the workpiece, a substantial seal portion between the hydraulic forming nozzle and the workpiece can be secured widely and reliably. It is possible to suppress unnecessary discharge of the pressurized fluid at the time of hydraulic molding , and the pressing process can be performed reliably, and a substantial seal portion between the hydraulic nozzle and the member to be processed is provided. Can be obtained more reliably.

  In addition, since the movable core has the cam portion, the movable core can enter the inside of the member to be processed more reliably.

  In addition, since the movable core has an outer surface shape that entirely contacts the inner surface of the workpiece to be processed after press molding, the substantial seal portion between the hydraulic forming nozzle and the workpiece to be processed is more reliably secured. Can be obtained in an appropriate state.

Further, when the hydraulic forming nozzle enters the member to be processed and when the member to be processed is press-molded, the movable core has a first movable core and a second movable core that rotate in opposite directions. By having the core, the movable core can be rotated in a smaller rotation range, and it is easier to enter the movable member into the workpiece and to press the mold during press molding. It can be.

  Further, the first abutting portion of the first movable core and the second abutting portion of the second movable core are in contact with each other when the hydraulic forming nozzle enters the workpiece, By restricting the rotation of the first movable core and the rotation of the second movable core, the hydraulic pressure forming nozzle can enter the processing target member with a more stable posture.

  Further, the third abutting portion of the first movable core and the fourth abutting portion of the second movable core are brought into contact with each other when the member to be processed is pressed and molded. By restricting the rotation of the first movable core and the rotation of the second movable core, preliminary press molding before hydraulic molding can be executed more reliably.

  In addition, the projecting portion of the shaft forms a molding shape of the processing target member in cooperation with the movable core when the processing target member is embossed and press-molded. A substantial seal portion between the target member can be obtained over a wide range with higher accuracy.

  Moreover, if such a hydraulic forming nozzle is used, a hydraulic forming apparatus or a hydraulic forming method capable of suppressing unnecessary discharge of pressurized fluid at the time of hydraulic forming can be obtained.

  In the present invention, the shape, arrangement, number, and the like of the members are not limited to the above-described embodiments, and the constituent elements thereof are appropriately replaced with those having the same operational effects, and the gist of the invention is not deviated. Of course, it can be appropriately changed within the range.

  As described above, according to the hydraulic molding nozzle, the hydraulic molding apparatus, or the hydraulic molding method of the present invention, unnecessary discharge of pressurized fluid during hydraulic molding can be suppressed. It is expected that it can be widely applied to the field of hydroforming because of its natural character.

DESCRIPTION OF SYMBOLS 1 ......... Hydraulic shaping nozzle 10 ... Base block 12 ... Pressurized fluid communication hole 14 ... Liquid channel 16 ... Seal head coupling hole 18 ... Hydraulic cylinder coupling hole 20 ... Fastening hole 30 ... Seal Head 32 …… Liquid channel 34 …… Communicating fluid channel 36 …… Fastening member insertion hole 38 …… Coupling portion 40 …… Shaft coupling hole 42 …… Seal portion 44 …… Small diameter portion 45 …… O-ring 50 …… Shaft 52 …… Liquid channel 54 …… Nozzle 56 …… Shaft body 58 …… Shaft end 60 …… Coupling part 62 …… Overhanging part 62a… Upper part 62b… First oblique part 62c… Second oblique part 70 …… First 1 movable core 70a ... lower part 70b ... upper part 70c ... concave part 70d ... contact part 70e ... contact part 72 ... fitting part 74 ... cam part 76 ... lower oblique part 78 ... upper oblique part 90 ... Second movable core 90a ... lower part 90b Upper part 90c ... Recessed part 90d ... Abutting part 90e ... Abutting part 92 ... Insertion part 94 ... Cam part 96 ... Lower oblique part 98 ... Upper oblique part 100 ......... Hydraulic cylinder 102 ......... Coupling part 200 ......... Upper mold 300 ......... Lower mold 400 ......... Processing target member 400 '... Processing target member 400a ... End 400b ... Main body 400b' ... Main body 400e ... Entry end 500 ... ... Hydraulic molding equipment

Claims (9)

A base block supplied with pressurized fluid;
A seal head that is fixed to the base block and enters the entry end of the member to be processed so as to come into contact freely;
A shaft fixed to the seal head;
A movable core attached to the shaft so as to be rotatable so as to move following the shape of the entry end of the workpiece when the seal head enters the workpiece;
Equipped with a,
The movable core is formed when the work target member is pressed and formed after the seal head enters the work target member and contacts the entry end. hydroforming nozzle Ru rotatably der corresponds to. 2. The hydraulic molding according to claim 1, wherein the movable core has a cam portion that slides following the shape of the entry end portion of the processing target member when the seal head enters the processing target member. nozzle. 3. The hydraulic forming nozzle according to claim 1, wherein the movable core has an outer surface shape that is entirely in contact with an inner surface of the processing target member after the processing target member is embossed. 4. The movable core includes a first movable core rotatably attached to the shaft and a second movable core rotatably attached to the shaft, the first movable core and The second movable core rotates in the reverse rotation direction when the seal head enters the processing target member and when the processing target member is pressed and molded. 4. The hydraulic forming nozzle according to any one of 3 above. The first movable core has a first abutting portion, the second movable core has a second abutting portion, the first abutting portion and the second abutting portion. The abutting portions abut against each other when the seal head enters the workpiece, and restrict rotation of the first movable core and rotation of the second movable core. 4. The hydroforming nozzle according to 4. The first movable core has a third contact portion, the second movable core has a fourth contact portion, the third contact portion and the fourth contact portion. The abutting portions abut each other when the member to be processed is pressed and molded, thereby restricting rotation of the first movable core and rotation of the second movable core. Item 6. The hydraulic forming nozzle according to Item 4 or 5 . The shaft includes an overhanging portion, and the overhanging portion cooperates with the movable core to define a forming shape of the processing target member when the processing target member is pressed and molded. The hydroforming nozzle according to any one of claims 1 to 6 . A base block to which a pressurized fluid is supplied; a seal head fixed to the base block and entering in contact with an entry end of a workpiece; a shaft fixed to the seal head; and the seal head A hydraulic forming nozzle having a movable core attached to the shaft so as to be rotatable so as to be able to move following the shape of the entry end of the workpiece when entering the workpiece. When,
A pressurized fluid supply source for supplying the pressurized fluid to the base block;
A cylinder that presses the base block toward the workpiece,
A stamping die for stamping the workpiece;
Equipped with a,
The movable core is formed when the work target member is pressed and formed after the seal head enters the work target member and contacts the entry end. in response to rotatable der Ru hydroforming apparatus. A base block to which a pressurized fluid is supplied; a seal head fixed to the base block and entering in contact with an entry end of a workpiece; a shaft fixed to the seal head; and the seal head A hydraulic forming nozzle having a movable core attached to the shaft so as to be rotatable so as to be able to move following the shape of the entry end of the workpiece when entering the workpiece. A process of preparing
Placing the member to be processed on the pressing die;
The hydraulic forming nozzle advances toward the processing target member, and rotates while moving the movable core following the shape of the entry end portion of the processing target member to enter the processing target member. And a step of abutting the seal head on the entry end of the workpiece to be processed;
A step of embossing the processing target member with the pressing die in a state where the movable core has entered the processing target member;
Supplying a pressurized fluid to the inside of the processing target member embossed with the pressing die;
Equipped with a,
The movable core is formed when the work target member is pressed and formed after the seal head enters the work target member and contacts the entry end. hydraulic forming method Ru rotatably der corresponds to.

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