US20030226388A1 - Rotary drive apparatus for rotary body - Google Patents
Rotary drive apparatus for rotary body Download PDFInfo
- Publication number
- US20030226388A1 US20030226388A1 US10/193,988 US19398802A US2003226388A1 US 20030226388 A1 US20030226388 A1 US 20030226388A1 US 19398802 A US19398802 A US 19398802A US 2003226388 A1 US2003226388 A1 US 2003226388A1
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- United States
- Prior art keywords
- cam
- rotary
- cam follower
- forming
- rotary body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
- B21D22/08—Stamping using rigid devices or tools with die parts on rotating carriers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/08—Dies with different parts for several steps in a process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
- B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
- B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
- B21D19/082—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws for making negative angles
- B21D19/086—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws for making negative angles with rotary cams
Definitions
- the present invention relates to a rotary drive apparatus for a rotary body; more specifically, the present invention relates to, for example, a rotary-cam driven apparatus for a negative-angle formation die used to form a thin metallic sheet.
- the “negative-angle forming die” refers to a die for performing intrusive forming of a work of the material such as to be intruded into a lower die from a linear descendent locus of an upper die.
- intrusive forming for a work of a thin metallic sheet is performed in the following manner.
- a work is first set on a lower die, an upper die is then vertically moved downward, a passive cam of a lower die is driven using an active cam of an upper die, and the work is transversely processed.
- the active cam is retracted using a spring.
- a forming portion of the aforementioned passive cam is operated to slide in the transverse direction from the outside of the work to performing the forming process of the work.
- the forming portion of the passive cam is formed to have an integral shape that is the same as the shape of a forming portion of the work.
- the forming portion of the lower die on which the work is mounted needs to be retracted by separating an intruding portion of the lower die.
- the forming portion needs to be formed to enable the work to be taken out in such a way that a rear portion of the intruding portion is preliminarily removed and the work is moved forward.
- the problem is not so serious when the extent of intrusion is minor, it becomes a serious when the intrusion extent is large and depending upon the type of the work.
- a long and slender frame-like vehicle component having a grooved section such as a front pillar outer formed of a thin metallic sheet
- the width of the grooved portion is small, when the intruding portion of the lower die is separated or removed, the component cannot be neatly formed in a desired shape; and in addition, since the strength of the lower die is not sufficient, the intrusive forming cannot be performed.
- a negative-angle forming die having a configuration as described below has been proposed.
- a forming portion intruded into a lower die from a linear descendent locus of an upper die is formed, and a rotary cam is then rotationally retracted to be in a state where a formed work can be taken out from a lower die.
- the negative-angle forming die includes a lower die 102 for mounting a work W of a thin metallic sheet onto a supporting portion 101 , and an upper die 103 that is descended in a linear direction towards the lower die 102 for forming the work W by hitting against the work W.
- the negative-angle forming die further includes a rotary cam 106 provided on the lower die 102 to be rotatable.
- the rotary cam 106 includes a groove 104 that is open to an outer peripheral surface and that is carved along an axial direction, and an intrusive-forming portion 105 that is formed at an edge portion of the groove 104 which is closer to the supporting portion 101 and that is intruded from a locus of the upper die 103 .
- the negative-angle forming die includes a slide cam 108 that includes an intrusive-forming portion 107 and that is provided to the upper die 103 to be slidable in opposition to the rotary cam 106 ; and an air cylinder 109 provided to the lower die 102 for rotationally retracting the rotary cam 106 to be in a state where the work W can be taken out from the lower die 102 upon completion of the forming process.
- the work W set on the supporting portion 101 of the lower die 102 is formed using the intrusive forming portion 105 of the rotary cam 106 and the intrusive forming portion 107 of the slide cam 108 .
- the slide cam 108 slides to perform the forming process of the work W; and upon completion of the forming process, the rotary cam 106 is rotationally retracted using the air cylinder 109 to enable the formed work W to be taken out from the lower die 102 .
- the upper die 103 is positioned at a top dead center, and the work W is mounted onto the supporting portion 101 of the lower die 102 .
- the rotary cam 106 is brought into a state of being retracted by the air cylinder 109 .
- the rotary cam 106 is brought into a state of being retracted by the air cylinder 109 .
- the upper die 103 starts to descend, and a pad 110 presses the work W mounted onto the supporting portion 101 of the lower die 102 .
- the upper die 103 descends, and as shown in FIG. 13, the lower face of the slide cam 108 engages a rotating plate 111 .
- the slide com 108 operates without interfering with the intrusive-forming portion 105 of the rotary cam 106 .
- the air cylinder is required to rotationally return the rotary cam to enable the formed work to be take out after completion of the intrusive forming.
- FIGS. 17 to 20 a description will be made regarding a rotary-cam driven apparatus for a negative-angle forming die by way of an example of the rotary drive apparatus for the negative-angle forming die.
- a rotary cam 5 is rotatably disposed in a lower die 1 .
- a cylinder 51 for returning the rotary cam 5 is disposed in the lower die 1 .
- a cam follower arm 52 is mounted to the rotary cam 5 .
- a planar driver 53 for controlling the cam follower arm 52 is provided in an upper die 3 .
- Supporting axes 11 are individually protrudedly provided to two ends of the axial rotary cam 5 .
- the supporting axis 11 is internally fitted to a metal 12 of a bearing 13 (to which the cylindrical metal 12 is fixed) to be rotatable, thereby enabling the rotary cam 5 to rotate.
- a base plate 14 of the supporting axis 11 is fixed with a bolt to an axial end of the rotary cam 5 .
- the bearing 13 for receiving the supporting axis 11 is fixed with a bolt 16 to the lower die 1 .
- An end portion 11 a of the supporting axis 11 is formed as a square column to thereby enable the output of the air cylinder 51 to be securely transferred to the rotary cam 5 .
- the cam follower arm 52 protrudes from a disc portion, is formed of two members, receives the end portion 11 a of the supporting axis 11 in the center, and is connected with bolts 54 .
- a cam follower 55 is rotatably provided to one of the ends of the cam follower arm 52 , and is fixed with a nut 56 to prevent detachment.
- the other end of the cam follower arm 52 is connected to the end of a piston rod. 57 of the cylinder 51 with a pin 59 via a connecting member 58 .
- a threaded rod portion 67 of the end of the piston rod 57 is inserted into a connecting member 58 , a nut 68 threaded on the threaded rod portion 67 is tightened to thereby connect the connecting member 58 and the end of the piston rod 57 .
- a rotation start position and a rotation termination position of the cam follower arm is not precisely determined. As such, in a state where the rotary cam 5 cannot be accurately disposed, intrusive forming is performed, thereby disabling the implementation of high-quality work processes.
- the cylinder 51 is fixed to the lower die 1 with a bolt 61 via a bracket 60 .
- the piston rod 57 of the cylinder 51 extends to thereby maintain the forming posture; and after the upper die 3 descends and intrusive forming is completed, the piston rod 57 retracts, and the rotary cam 5 rotationally retracts. Then, the work becomes ready to be taken out upwardly.
- the driver 53 of the upper die 3 and the cam follower arm 52 of the lower die 1 cause the rotary cam 5 to assume, for example, the forming posture and a posture enabling the rotationally retracted work to be taken out upwardly.
- the planar driver 53 is provided in a portion opposing the cam follower arm 52 of the upper die 3 .
- the rotation of the rotary cam 5 is controlled by causing the cam follower 55 of the cam follower arm 52 to engage a cam face 62 of the driver 53 .
- the cam face 62 is determined in consideration regarding the position where the rotary cam 5 is rotated during a descending stroke of a press, and the time of assuming a predetermined forming posture at what level of the rotation.
- the rotary cam 5 is rotated at a sloped portion 62 a of the cam face 62 , and the forming posture is maintained at a perpendicular portion 62 b of the cam face 62 .
- the driver 53 is fixed with a bolt 63 to the upper die 3 .
- the cylinder 51 causes the rotary cam 5 to return when the upper die 3 rises, and the cam follower 55 is positioned not to be in contact with the cam face 62 of the driver 53 .
- FIG. 18 shows a state where the upper die 3 is at a top dead center
- FIG. 19 shows a state where the upper die 3 is at a bottom dead center.
- FIG. 20 is a plan view of the configuration shown in FIG. 19.
- the rotating apparatus for rotating the rotary body according to the extension and retraction of the piston rod of the cylinder is configured such that the supporting axes are provided to protrude from two ends of the rotary body, the supporting axes are held to rotatably provide the rotary body, the central portion of the cam follower arm is fixed to the supporting axes, the threaded rod portion that is provided at the end of the piston rod and that connects the one end of the cam follower arm and the piston rod is inserted into the connecting member, the nut threaded on the threaded rod portion is tightened, and the connecting member and the end of the piston rod is thereby connected.
- the rotation start position and the rotation termination position of the cam follower arm are not determined because of variations in the amount of tightening the nut. As such, the rotary cam cannot be accurately positioned.
- intrusive forming is performed in the above-described state, cases can occur in which high-quality work processing cannot be implemented.
- the present invention is to provide a rotary drive apparatus for a rotary body for rotating the rotary body through extension and extraction of the piston rod of the cylinder, wherein a rotation start and a rotation termination position can be accurately determined, intrusive forming can be performed with the rotary cam being accurately positioned, and high-quality work processing can be implemented.
- the rotary drive apparatus is configured such that supporting axes are provided to individually protrude from two ends of the rotary body, the supporting axes are held and the rotary body are rotatably provided, a central portion of a cam follower arm is fixed to the supporting axis, one end of the cam follower arm and the piston rod of the cylinder are connected via a guide plate provided therebetween, a guide groove is carved on the guide plate to rotate the cam follower separately in a stroke direction of the piston rod and in a direction perpendicular thereto, and a cam follower at the end of the cam follower arm is engaged with the guide groove.
- the present invention provides a rotary-cam driven apparatus for a negative-angle forming die comprising a lower die for mounting a work of a thin metallic sheet onto a supporting portion, an upper die that is linearly descended to the lower die for forming the work by hitting against the work, a rotary cam rotatably provided in the lower die to comprise an intrusive-forming portion that is formed at an edge portion closer to a supporting portion and that is intruded from a locus of the upper die, a slide cam that comprises an intrusive-forming portion and that is provided to the upper die to be slidable in opposition to the rotary cam, and an automatic returning tool provided to the lower die for rotationally retracting the rotary cam to be in a state where the work can be taken out from the lower die upon completion of the forming process, wherein the slide cam performs the forming process of the work set on the supporting portion of the lower die by using the intrusive forming portion of the rotary cam, and the rotary cam is rotationally re
- FIG. 1 is a side view of a state where an upper die of a rotary-cam driven apparatus for a negative-angle forming die according to a practical embodiment of the present invention is positioned at a top dead center;
- FIG. 2 is a side view of state where the upper die shown in FIG. 1 is positioned at a bottom dead center;
- FIG. 3 is a plan view of a state excluding the upper die shown in FIG. 2;
- FIG. 4 is a front view of a fixing plate according to the present invention.
- FIG. 5 is a side view of the fixing plate according to the present invention.
- FIG. 6 is a front view of a guide plate according to the present invention.
- FIG. 7 is a side view of the guide plate according to the present invention.
- FIG. 8 is a front view of a guide plate support according to the present invention.
- FIG. 9 is a side view of the guide-plate support according to the present invention.
- FIG. 10 is a plan view of the guide plate support according to the present invention.
- FIG. 11 is a vertical cross-sectional view of a state where an upper die of a conventional negative-angle forming die for performing intrusive forming is positioned at a top dead center;
- FIG. 12 is a vertical cross-sectional view of a state where, in the conventional negative-angle forming die, a rotary cam is operated by an air cylinder to assume a forming posture, the upper die descends, and a work is pressed by a pad;
- FIG. 13 is a vertical cross-sectional view of a state where the upper die has descended, abutted on a lower die, and begun to contact the work in the conventional negative-angle forming die;
- FIG. 14 is a vertical cross-sectional view of a state where the upper die of the conventional negative-angle forming die is positioned at a bottom dead center;
- FIG. 15 is a vertical cross-sectional view of a state where the intrusive forming was completed and has begun to rise in the conventional negative-angle forming die;
- FIG. 16 is a vertical cross-sectional view where the conventional negative-angle forming die performed the intrusive forming, and the upper die further rose, and is positioned at the top dead center;
- FIG. 17 is a schematic view showing a pattern diagrams of a rotary-cam driven apparatus for a negative-angle forming die
- FIG. 18 is a side view showing a state where an upper die of the practical example of the rotary-cam driven apparatus for the negative-angle forming die is positioned at a top dead center;
- FIG. 19 is a side view of a state where the upper die shown in FIG. 18 is positioned at a bottom dead center;
- FIG. 20 is a plan view of the state shown in FIG. 19.
- FIGS. 1 to 10 The embodiment of the present invention is shown in FIGS. 1 to 10 , in which the same numerals or symbols will be used to refer to the same components shown in FIGS. 17 to 20 .
- a guide plate 71 is provided between a piston rod 69 of the cylinder 51 and a cam follower arm 70 .
- a cam follower 73 of cam follower arm 70 is fitted into a guide groove 72 of the guide plate 71 .
- the cam follower arm 70 is provided to extend rectangular from a disc portion in the center.
- the cam follower arm 70 is formed of two members, in which a cam follower 55 is rotatably provided to one end thereof, and the cam follower 73 is fitted into the guide groove 72 of the other end thereof.
- the guide groove 72 provided onto the guide plate 71 .
- the guide groove 72 is carved in regions in the direction of the stroke of the piston rod 69 and the direction perpendicular thereto to allow the cam follower 73 to rotate.
- the guide groove 72 is thus carved to cover separate regions in the direction of the stroke of the piston rod 69 and the direction perpendicular thereto (in the drawings, the guide groove 72 is carved in upper and lower regions) in order to allow the cam follower 73 as well as the rotary cam 5 to rotate.
- the guide groove 72 is carved to allow the cam follower 73 to smoothly and is set slightly longer than the stroke of the piston rod 69 .
- the guide groove 72 includes an horizontal groove 72 a and a sloped groove 72 b.
- the piston rod 69 of the cylinder 51 and the guide plate 71 are connected by turning a threaded end portion of the piston rod 69 into the guide plate 71 , and a fixing plate 74 shown in FIGS. 4 and 5 is used to lock rotation of the piston rod 69 .
- a fixing plate 74 shown in FIGS. 4 and 5 is used to lock rotation of the piston rod 69 .
- two plane portions 76 a formed by cutting two sides are provided between a small-diameter end portion 69 a and a large-diameter base end portion 69 b of the piston rod 69 .
- a groove 76 of the fixing plate 74 is externally fitted to the two plane portions 76 a , and the fixing plate 74 is fixed with a bolt 78 to the fixing plate 74 .
- the guide groove 72 is on the reverse side of a portion shown in FIGS. 1 and 2, and the cam follower 73 of the cam follower arm 70 is engaged therewith.
- horizontal guide grooves 75 and 76 are carved to horizontally transfer the extension and extraction of the piston rod 69 of the cylinder 51 .
- a roller 78 and rollers 79 and 80 of a guide-plate support 77 shown in FIGS. 8 to 10 are engaged with the horizontal guide groove 75 and horizontal guide groove 76 , respectively.
- the guide-plate support 77 is fixed with a bolt 81 to the lower die 1 .
- FIG. 1 shows a state where the upper die 3 is positioned at a top dead center
- FIG. 2 shows a state where the upper die 3 is positioned at a bottom dead center
- FIG. 3 is a plan view showing a state excluding the upper die 3 shown in FIG. 2.
- the rotary drive apparatus for a rotary body for rotating the rotary body through extension and extraction of a piston rod of a cylinder is arranged such that supporting axes are provided to individually protrude from two ends of the rotary body, the supporting axes are held and the rotary body are rotatably provided, a central portion of a cam follower arm is fixed to the supporting axis, one end of the cam follower arm and the piston rod of the cylinder are connected via a guide plate provided therebetween, a guide groove is carved on the guide plate to rotate the cam follower separately in a stroke direction of the piston rod and in a direction perpendicular thereto, and a cam follower at the end of the cam follower arm is engaged with the guide groove.
- the rotary drive apparatus for a rotary body for rotating the rotary body through extension and extraction of the piston rod of the cylinder, and a rotation start and a rotation termination position can be accurately determined, intrusive forming can be performed with the rotary cam being accurately positioned, thereby enabling high-quality work processing to be implemented.
- the power of the cylinder is abruptly transferred with shocks.
- the cylinder and the rotary body are connected via the guide groove, shocks in abrupt movements of the cylinder and the piston rod are absorbed by the guide groove. As such, no shocks are transferred to the rotary body.
- the present invention is a rotary-cam driven apparatus for a negative-angle forming die comprising a lower die for mounting a work of a thin metallic sheet onto a supporting portion, an upper die that is linearly descended to the lower die for forming the work by hitting against the work, a rotary cam rotatably provided in the lower die to comprise an intrusive-forming portion that is formed at an edge portion closer to a supporting portion and that is intruded from a locus of the upper die, a slide cam that comprises an intrusive-forming portion and that is provided to the upper die to be slidable in opposition to the rotary cam, and an automatic returning tool provided to the lower die for rotationally retracting the rotary cam to be in a state where the work can be taken out from the lower die upon completion of the forming process, wherein the slide cam performs the forming process of the work set on the supporting portion of the lower die by using the intrusive forming portion of the rotary cam, and the rotary cam is rotationally re
Abstract
A rotary drive apparatus for a rotary body for rotating a rotary body through extension and extraction of the piston rod of the cylinder accurately determines a rotation start and a rotation termination position, and performs intrusive forming with the rotary cam being accurately positioned. As such, high-quality work processing can be implemented; and furthermore, shocks of a cylinder are absorbed, and are not transferred to the rotary body.
A rotary drive apparatus for a rotary body for rotating a rotary body through extension and extraction of the piston rod of the cylinder is configured such that supporting axes are provided to respectively protrude from two ends of the rotary body, the supporting axes are held and the rotary body are rotatably provided, a central portion of a cam follower arm is fixed to the supporting axis, one end of the cam follower arm and the piston rod of the cylinder are connected via a guide plate provided therebetween, a guide groove is carved on the guide plate to rotate the cam follower separately in a stroke direction of the piston rod and in a direction perpendicular thereto, and a cam follower at the end of the cam follower arm is engaged with the guide groove.
Description
- The present invention relates to a rotary drive apparatus for a rotary body; more specifically, the present invention relates to, for example, a rotary-cam driven apparatus for a negative-angle formation die used to form a thin metallic sheet. The “negative-angle forming die” refers to a die for performing intrusive forming of a work of the material such as to be intruded into a lower die from a linear descendent locus of an upper die.
- According to a conventional method, intrusive forming for a work of a thin metallic sheet is performed in the following manner. A work is first set on a lower die, an upper die is then vertically moved downward, a passive cam of a lower die is driven using an active cam of an upper die, and the work is transversely processed. Subsequently, after the processing has been completed and the upper die has been moved up, the active cam is retracted using a spring.
- In the conventional method, a forming portion of the aforementioned passive cam is operated to slide in the transverse direction from the outside of the work to performing the forming process of the work. The forming portion of the passive cam is formed to have an integral shape that is the same as the shape of a forming portion of the work. However, since the work needs to be taken out from the lower die upon completion of the forming process, the forming portion of the lower die on which the work is mounted needs to be retracted by separating an intruding portion of the lower die. Alternatively, the forming portion needs to be formed to enable the work to be taken out in such a way that a rear portion of the intruding portion is preliminarily removed and the work is moved forward. Although the problem is not so serious when the extent of intrusion is minor, it becomes a serious when the intrusion extent is large and depending upon the type of the work. For example, suppose a long and slender frame-like vehicle component having a grooved section, such as a front pillar outer formed of a thin metallic sheet, is processed as a work. In this case, since the width of the grooved portion is small, when the intruding portion of the lower die is separated or removed, the component cannot be neatly formed in a desired shape; and in addition, since the strength of the lower die is not sufficient, the intrusive forming cannot be performed.
- In addition, there are cases in which defective portions such as torsional and/or warped portions are formed in products, and correction needs to be performed therefor. However, cases occur in which even correction is practically impossible. For example, correction is practically impossible for defective portions formed on components constituting outer panel portions of a vehicle, such as a side panel, a fender, a roof, a bonnet, a trunk lid, a door panel, and a front pillar outer that have three-dimensional curved surfaces and curved lines. In assembling a product of a thin metallic sheet for a vehicle, when the product has defective portions such as torsions or warps, the product cannot be coupled to other components. Consequently, a high-quality vehicle-dedicated structure of a thin metallic sheet cannot be provided, and a predetermined product accuracy cannot be maintained for a product formed of a thin metallic sheet.
- To solve the above-described problems, a negative-angle forming die having a configuration as described below has been proposed. In the configuration, a forming portion intruded into a lower die from a linear descendent locus of an upper die is formed, and a rotary cam is then rotationally retracted to be in a state where a formed work can be taken out from a lower die.
- Referring to FIGS.11 to 16, the negative-angle forming die includes a
lower die 102 for mounting a work W of a thin metallic sheet onto a supportingportion 101, and anupper die 103 that is descended in a linear direction towards thelower die 102 for forming the work W by hitting against the work W. In addition, the negative-angle forming die further includes arotary cam 106 provided on thelower die 102 to be rotatable. Therotary cam 106 includes agroove 104 that is open to an outer peripheral surface and that is carved along an axial direction, and an intrusive-formingportion 105 that is formed at an edge portion of thegroove 104 which is closer to the supportingportion 101 and that is intruded from a locus of theupper die 103. In addition, the negative-angle forming die includes aslide cam 108 that includes an intrusive-formingportion 107 and that is provided to theupper die 103 to be slidable in opposition to therotary cam 106; and anair cylinder 109 provided to thelower die 102 for rotationally retracting therotary cam 106 to be in a state where the work W can be taken out from thelower die 102 upon completion of the forming process. In this configuration, the work W set on the supportingportion 101 of thelower die 102 is formed using the intrusive formingportion 105 of therotary cam 106 and the intrusive formingportion 107 of theslide cam 108. In this case, theslide cam 108 slides to perform the forming process of the work W; and upon completion of the forming process, therotary cam 106 is rotationally retracted using theair cylinder 109 to enable the formed work W to be taken out from thelower die 102. - Hereinbelow, operations of the negative-angle forming die will be described.
- First, as shown in FIG. 11, the
upper die 103 is positioned at a top dead center, and the work W is mounted onto the supportingportion 101 of thelower die 102. At this time, therotary cam 106 is brought into a state of being retracted by theair cylinder 109. - Subsequently, as shown in FIG. 12, the
rotary cam 106 is brought into a state of being retracted by theair cylinder 109. Theupper die 103 starts to descend, and apad 110 presses the work W mounted onto the supportingportion 101 of thelower die 102. - Then, the
upper die 103 descends, and as shown in FIG. 13, the lower face of theslide cam 108 engages a rotating plate 111. At this time, theslide com 108 operates without interfering with the intrusive-formingportion 105 of therotary cam 106. - When the
upper die 103 continues to descend, theslide cam 108 in the state of being urged outwardly of the die is transversely moved by the cam operation to the left in opposition to an urged force of acoiled spring 112. Thereby, theslide cam 108 is brought into a state shown in FIG. 14, whereby intrusive forming of the work W is performed through the intrusive-formingportion 105 of the rotatedrotary cam 106 and the intrusive-formingportion 107 of theslide cam 108. - After the intrusive forming has been completed as shown in FIG. 15, the
upper die 103 starts to move up. - The
slide cam 108 outwardly urged by thecoiled spring 112 is moved rightward in FIG. 16, theslide cam 108 rises without interfering with the work W. - The
slide cam 108 thus rises, therotary cam 106 rotates rightward according to theair cylinder 109, as shown in FIG. 16, and the work W intrusively formed is then taken out from thelower die 102. At this time, the work W can be taken out without causing interference with the intrusive-formingportion 105 of therotary cam 106. - As described above, the air cylinder is required to rotationally return the rotary cam to enable the formed work to be take out after completion of the intrusive forming.
- Hereinbelow, referring to FIGS.17 to 20, a description will be made regarding a rotary-cam driven apparatus for a negative-angle forming die by way of an example of the rotary drive apparatus for the negative-angle forming die.
- A
rotary cam 5 is rotatably disposed in alower die 1. Acylinder 51 for returning therotary cam 5 is disposed in thelower die 1. Acam follower arm 52 is mounted to therotary cam 5. Aplanar driver 53 for controlling thecam follower arm 52 is provided in anupper die 3. - Supporting
axes 11 are individually protrudedly provided to two ends of the axialrotary cam 5. The supportingaxis 11 is internally fitted to ametal 12 of a bearing 13 (to which thecylindrical metal 12 is fixed) to be rotatable, thereby enabling therotary cam 5 to rotate. Abase plate 14 of the supportingaxis 11 is fixed with a bolt to an axial end of therotary cam 5. The bearing 13 for receiving the supportingaxis 11 is fixed with abolt 16 to thelower die 1. - An
end portion 11 a of the supportingaxis 11 is formed as a square column to thereby enable the output of theair cylinder 51 to be securely transferred to therotary cam 5. - The
cam follower arm 52 protrudes from a disc portion, is formed of two members, receives theend portion 11 a of the supportingaxis 11 in the center, and is connected withbolts 54. Acam follower 55 is rotatably provided to one of the ends of thecam follower arm 52, and is fixed with anut 56 to prevent detachment. The other end of thecam follower arm 52 is connected to the end of a piston rod. 57 of thecylinder 51 with apin 59 via a connectingmember 58. A threadedrod portion 67 of the end of thepiston rod 57 is inserted into a connectingmember 58, anut 68 threaded on the threadedrod portion 67 is tightened to thereby connect the connectingmember 58 and the end of thepiston rod 57. Because of variations in the amount of tightening thenut 68, a rotation start position and a rotation termination position of the cam follower arm is not precisely determined. As such, in a state where therotary cam 5 cannot be accurately disposed, intrusive forming is performed, thereby disabling the implementation of high-quality work processes. Thecylinder 51 is fixed to thelower die 1 with abolt 61 via abracket 60. - Ordinarily, the
piston rod 57 of thecylinder 51 extends to thereby maintain the forming posture; and after theupper die 3 descends and intrusive forming is completed, thepiston rod 57 retracts, and therotary cam 5 rotationally retracts. Then, the work becomes ready to be taken out upwardly. - If the
cylinder 51 malfunctions, thedriver 53 of theupper die 3 and thecam follower arm 52 of thelower die 1 cause therotary cam 5 to assume, for example, the forming posture and a posture enabling the rotationally retracted work to be taken out upwardly. - Specifically, the
planar driver 53 is provided in a portion opposing thecam follower arm 52 of theupper die 3. The rotation of therotary cam 5 is controlled by causing thecam follower 55 of thecam follower arm 52 to engage acam face 62 of thedriver 53. Thecam face 62 is determined in consideration regarding the position where therotary cam 5 is rotated during a descending stroke of a press, and the time of assuming a predetermined forming posture at what level of the rotation. Therotary cam 5 is rotated at a sloped portion 62 a of thecam face 62, and the forming posture is maintained at aperpendicular portion 62 b of thecam face 62. - The
driver 53 is fixed with abolt 63 to theupper die 3. - The
cylinder 51 causes therotary cam 5 to return when theupper die 3 rises, and thecam follower 55 is positioned not to be in contact with thecam face 62 of thedriver 53. - FIG. 18 shows a state where the
upper die 3 is at a top dead center, and FIG. 19 shows a state where theupper die 3 is at a bottom dead center. - When the
upper die 3 descends from the state of the top dead center, the sloped portion 62 a of thecam face 62 of thedriver 53 of theupper die 3 engages thecam follower 55 of thecam follower arm 52 of thelower die 1. Then, when therotary cam 5 rotates, and thecam follower 55 reaches theperpendicular portion 62 b of thecam face 62, therotary cam 5 holds the forming posture. When the intrusive forming process has been completed, theupper die 3 rises. Since nothing remains to constrain thecam follower arm 52, therotary cam 5 is returned by thecylinder 51 to the original position. - FIG. 20 is a plan view of the configuration shown in FIG. 19.
- The rotating apparatus for rotating the rotary body according to the extension and retraction of the piston rod of the cylinder is configured such that the supporting axes are provided to protrude from two ends of the rotary body, the supporting axes are held to rotatably provide the rotary body, the central portion of the cam follower arm is fixed to the supporting axes, the threaded rod portion that is provided at the end of the piston rod and that connects the one end of the cam follower arm and the piston rod is inserted into the connecting member, the nut threaded on the threaded rod portion is tightened, and the connecting member and the end of the piston rod is thereby connected.
- However, the rotation start position and the rotation termination position of the cam follower arm are not determined because of variations in the amount of tightening the nut. As such, the rotary cam cannot be accurately positioned. When intrusive forming is performed in the above-described state, cases can occur in which high-quality work processing cannot be implemented.
- In view of the above circumstances, the present invention is to provide a rotary drive apparatus for a rotary body for rotating the rotary body through extension and extraction of the piston rod of the cylinder, wherein a rotation start and a rotation termination position can be accurately determined, intrusive forming can be performed with the rotary cam being accurately positioned, and high-quality work processing can be implemented. The rotary drive apparatus is configured such that supporting axes are provided to individually protrude from two ends of the rotary body, the supporting axes are held and the rotary body are rotatably provided, a central portion of a cam follower arm is fixed to the supporting axis, one end of the cam follower arm and the piston rod of the cylinder are connected via a guide plate provided therebetween, a guide groove is carved on the guide plate to rotate the cam follower separately in a stroke direction of the piston rod and in a direction perpendicular thereto, and a cam follower at the end of the cam follower arm is engaged with the guide groove.
- More specifically, the present invention provides a rotary-cam driven apparatus for a negative-angle forming die comprising a lower die for mounting a work of a thin metallic sheet onto a supporting portion, an upper die that is linearly descended to the lower die for forming the work by hitting against the work, a rotary cam rotatably provided in the lower die to comprise an intrusive-forming portion that is formed at an edge portion closer to a supporting portion and that is intruded from a locus of the upper die, a slide cam that comprises an intrusive-forming portion and that is provided to the upper die to be slidable in opposition to the rotary cam, and an automatic returning tool provided to the lower die for rotationally retracting the rotary cam to be in a state where the work can be taken out from the lower die upon completion of the forming process, wherein the slide cam performs the forming process of the work set on the supporting portion of the lower die by using the intrusive forming portion of the rotary cam, and the rotary cam is rotationally retracted by the automatic returning tool to enable the formed work to be taken out from the lower die; wherein the rotary-cam driven apparatus is configured such that supporting axes are provided to individually protrude from two ends of the rotary body, the supporting axes are held by the lower die and the rotary body are rotatably provided, a central portion of a cam follower arm is fixed to the supporting axis, one end of the cam follower arm and the piston rod of the cylinder are connected via a guide plate provided therebetween, a guide groove is carved on the guide plate to rotate the cam follower separately in a stroke direction of the piston rod and in a direction perpendicular thereto, and a cam follower at the end of the cam follower arm is engaged with the guide groove.
- FIG. 1 is a side view of a state where an upper die of a rotary-cam driven apparatus for a negative-angle forming die according to a practical embodiment of the present invention is positioned at a top dead center;
- FIG. 2 is a side view of state where the upper die shown in FIG. 1 is positioned at a bottom dead center;
- FIG. 3 is a plan view of a state excluding the upper die shown in FIG. 2;
- FIG. 4 is a front view of a fixing plate according to the present invention;
- FIG. 5 is a side view of the fixing plate according to the present invention;
- FIG. 6 is a front view of a guide plate according to the present invention;
- FIG. 7 is a side view of the guide plate according to the present invention;
- FIG. 8 is a front view of a guide plate support according to the present invention;
- FIG. 9 is a side view of the guide-plate support according to the present invention;
- FIG. 10 is a plan view of the guide plate support according to the present invention;
- FIG. 11 is a vertical cross-sectional view of a state where an upper die of a conventional negative-angle forming die for performing intrusive forming is positioned at a top dead center;
- FIG. 12 is a vertical cross-sectional view of a state where, in the conventional negative-angle forming die, a rotary cam is operated by an air cylinder to assume a forming posture, the upper die descends, and a work is pressed by a pad;
- FIG. 13 is a vertical cross-sectional view of a state where the upper die has descended, abutted on a lower die, and begun to contact the work in the conventional negative-angle forming die;
- FIG. 14 is a vertical cross-sectional view of a state where the upper die of the conventional negative-angle forming die is positioned at a bottom dead center;
- FIG. 15 is a vertical cross-sectional view of a state where the intrusive forming was completed and has begun to rise in the conventional negative-angle forming die;
- FIG. 16 is a vertical cross-sectional view where the conventional negative-angle forming die performed the intrusive forming, and the upper die further rose, and is positioned at the top dead center;
- FIG. 17 is a schematic view showing a pattern diagrams of a rotary-cam driven apparatus for a negative-angle forming die;
- FIG. 18 is a side view showing a state where an upper die of the practical example of the rotary-cam driven apparatus for the negative-angle forming die is positioned at a top dead center;
- FIG. 19 is a side view of a state where the upper die shown in FIG. 18 is positioned at a bottom dead center; and
- FIG. 20 is a plan view of the state shown in FIG. 19.
- Hereinbelow, the present invention will be described in detail using an a practical embodiment thereof with reference to the accompanying drawings.
- The embodiment of the present invention is shown in FIGS.1 to 10, in which the same numerals or symbols will be used to refer to the same components shown in FIGS. 17 to 20.
- A
guide plate 71 is provided between apiston rod 69 of thecylinder 51 and acam follower arm 70. Acam follower 73 ofcam follower arm 70 is fitted into aguide groove 72 of theguide plate 71. - The
cam follower arm 70 is provided to extend rectangular from a disc portion in the center. Thecam follower arm 70 is formed of two members, in which acam follower 55 is rotatably provided to one end thereof, and thecam follower 73 is fitted into theguide groove 72 of the other end thereof. - The
guide groove 72 provided onto theguide plate 71. Theguide groove 72 is carved in regions in the direction of the stroke of thepiston rod 69 and the direction perpendicular thereto to allow thecam follower 73 to rotate. Theguide groove 72 is thus carved to cover separate regions in the direction of the stroke of thepiston rod 69 and the direction perpendicular thereto (in the drawings, theguide groove 72 is carved in upper and lower regions) in order to allow thecam follower 73 as well as therotary cam 5 to rotate. Theguide groove 72 is carved to allow thecam follower 73 to smoothly and is set slightly longer than the stroke of thepiston rod 69. Theguide groove 72 includes anhorizontal groove 72 a and a slopedgroove 72 b. - The
piston rod 69 of thecylinder 51 and theguide plate 71 are connected by turning a threaded end portion of thepiston rod 69 into theguide plate 71, and a fixingplate 74 shown in FIGS. 4 and 5 is used to lock rotation of thepiston rod 69. As shown in FIGS. 2 and 4, two plane portions 76 a formed by cutting two sides are provided between a small-diameter end portion 69 a and a large-diameterbase end portion 69 b of thepiston rod 69. In addition, agroove 76 of the fixingplate 74 is externally fitted to the two plane portions 76 a, and the fixingplate 74 is fixed with abolt 78 to the fixingplate 74. - As shown in FIGS. 6 and 7, the
guide groove 72 is on the reverse side of a portion shown in FIGS. 1 and 2, and thecam follower 73 of thecam follower arm 70 is engaged therewith. On the obverse side,horizontal guide grooves piston rod 69 of thecylinder 51. In addition, aroller 78 androllers plate support 77 shown in FIGS. 8 to 10 are engaged with thehorizontal guide groove 75 andhorizontal guide groove 76, respectively. The guide-plate support 77 is fixed with abolt 81 to thelower die 1. - FIG. 1 shows a state where the
upper die 3 is positioned at a top dead center, and FIG. 2 shows a state where theupper die 3 is positioned at a bottom dead center. FIG. 3 is a plan view showing a state excluding theupper die 3 shown in FIG. 2. - When the
upper die 3 descends from the state of the top dead center, the sloped portion 62 a of thecam face 62 of thedriver 53 of theupper die 3 abuts against thecam follower 55 of thecam follower arm 70 of thelower die 1. Then, when therotary cam 5 rotates, and thecam follower 55 reaches theperpendicular portion 62 b of thecam face 62, the rotary cam maintains the forming posture. When an intrusive forming process for a work has been completed, theupper die 3 rises. In this case, nothing remains to constrain thecam follower arm 70, therotary cam 5 is returned by thecylinder 51 to the original position. - In the state of the top dead center shown in FIG. 1, the
cam follower 73 of thecam follower arm 70 in theguide groove 72 of theguide plate 71 is positioned in the slopedgroove 72 b. As theupper die 3 descends, thecam follower 73 moves from the slopedgroove 72 b to alinear groove 72 a. When thecam follower 73 is positioned in thelinear groove 72 a, thecam follower 55 is positioned at theperpendicular portion 62 b of thedriver 53 to cause therotary cam 5 to assume the forming posture. - Conventionally, when the piston rod of the cylinder is connected by tightening the threaded portion, because of variations in the amount of tightening the threaded portion, a rotation start position and a rotation termination position of the rotary cam has not been able to be precisely determined. As such, when intrusive forming is performed in the above-described state, high-quality work processes have not been able to be implemented. However, the present invention is arranged such that operation in the piston stroke of the
cylinder 51 is performed through the engagement between thecam follower 73 and theguide groove 72, no influences are caused on the rotation start and the rotation termination of the rotary cam, and high-quality work processing can therefore be implemented. - As described above, according to the present invention, the rotary drive apparatus for a rotary body for rotating the rotary body through extension and extraction of a piston rod of a cylinder is arranged such that supporting axes are provided to individually protrude from two ends of the rotary body, the supporting axes are held and the rotary body are rotatably provided, a central portion of a cam follower arm is fixed to the supporting axis, one end of the cam follower arm and the piston rod of the cylinder are connected via a guide plate provided therebetween, a guide groove is carved on the guide plate to rotate the cam follower separately in a stroke direction of the piston rod and in a direction perpendicular thereto, and a cam follower at the end of the cam follower arm is engaged with the guide groove. As such, in the rotary drive apparatus for a rotary body for rotating the rotary body through extension and extraction of the piston rod of the cylinder, and a rotation start and a rotation termination position can be accurately determined, intrusive forming can be performed with the rotary cam being accurately positioned, thereby enabling high-quality work processing to be implemented. Conventionally, when the cylinder is directly connected to the rotary body, the power of the cylinder is abruptly transferred with shocks. However, according to the present invention, since the cylinder and the rotary body are connected via the guide groove, shocks in abrupt movements of the cylinder and the piston rod are absorbed by the guide groove. As such, no shocks are transferred to the rotary body.
- More specifically, the present invention is a rotary-cam driven apparatus for a negative-angle forming die comprising a lower die for mounting a work of a thin metallic sheet onto a supporting portion, an upper die that is linearly descended to the lower die for forming the work by hitting against the work, a rotary cam rotatably provided in the lower die to comprise an intrusive-forming portion that is formed at an edge portion closer to a supporting portion and that is intruded from a locus of the upper die, a slide cam that comprises an intrusive-forming portion and that is provided to the upper die to be slidable in opposition to the rotary cam, and an automatic returning tool provided to the lower die for rotationally retracting the rotary cam to be in a state where the work can be taken out from the lower die upon completion of the forming process, wherein the slide cam performs the forming process of the work set on the supporting portion of the lower die by using the intrusive forming portion of the rotary cam, and the rotary cam is rotationally retracted by the automatic returning tool to enable the formed work to be taken out from the lower die; wherein the rotary-cam driven apparatus is configured such that supporting axes are provided to individually protrude from two ends of the rotary body, the supporting axes are held by the lower die and the rotary body are rotatably provided, a central portion of a cam follower arm is fixed to the supporting axis, one end of the cam follower arm and the piston rod of the cylinder are connected via a guide plate provided therebetween, a guide groove is carved on the guide plate to rotate the cam follower separately in a stroke direction of the piston rod and in a direction perpendicular thereto, and a cam follower at the end of the cam follower arm is engaged with the guide groove. Conventionally, when the cylinder is directly connected to the rotary body, the power of the cylinder is abruptly transferred with shocks. However, according to the present invention, since the cylinder and the rotary body are connected via the guide groove, shocks in abrupt movements of the cylinder and the piston rod are absorbed by the guide groove. As such, no shocks are transferred to the rotary body.
Claims (2)
1. A rotary drive apparatus for a rotary body for rotating the rotary body through extension and extraction of a piston rod of a cylinder, wherein supporting axes are provided to respectively protrude from two ends of the rotary body, the supporting axes are held and the rotary body are rotatably provided, a central portion of a cam follower arm is fixed to the supporting axis, one end of the cam follower arm and the piston rod of the cylinder are connected via a guide plate provided therebetween, a guide groove is carved on the guide plate to rotate the cam follower separately in a stroke direction of the piston rod and in a direction perpendicular thereto, and a cam follower at the end of the cam follower arm is engaged with the guide groove.
2. A rotary-cam driven apparatus for a negative-angle forming die comprising a lower die for mounting a work of a thin metallic sheet onto a supporting portion, an upper die that is linearly descended to said lower die for forming the work by joining up against the work, a rotary cam rotatably provided in the lower die to include an intrusive-forming portion that is formed at an edge portion closer to a supporting portion and that is intruded from a locus of the upper die, a slide cam that includes an intrusive-forming portion and that is provided to be slidable in opposition to said rotary cam, and an automatic returning tool provided to the lower die for rotationally retracting the rotary cam to be in a state where the work can be taken out from the lower die after the forming process, wherein the slide cam performs the forming of the work set on the supporting portion of the lower die by using the intrusive forming portion of the rotary cam and the intrusive slide cam, and the rotary cam is rotationally retracted by the automatic returning tool to enable the formed work to be taken out from the lower die after the forming process; wherein supporting axes are provided to respectively protrude from two ends of the rotary body, the supporting axes are held by the lower die and the rotary body are rotatably provided, a central portion of a cam follower arm is fixed to the supporting axis, one end of the cam follower arm and the piston rod of the cylinder are connected via a guide plate provided therebetween, a guide groove is carved on the guide plate to rotate the cam follower separately in a stroke direction of the piston rod and in a direction perpendicular thereto, and a cam follower at the end of the cam follower arm is engaged with the guide groove.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-167337 | 2002-06-07 | ||
JP2002167337A JP3509810B2 (en) | 2002-06-07 | 2002-06-07 | Rotary cam drive of negative angle forming die |
Publications (1)
Publication Number | Publication Date |
---|---|
US20030226388A1 true US20030226388A1 (en) | 2003-12-11 |
Family
ID=29545888
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/193,988 Abandoned US20030226388A1 (en) | 2002-06-07 | 2002-07-15 | Rotary drive apparatus for rotary body |
Country Status (6)
Country | Link |
---|---|
US (1) | US20030226388A1 (en) |
EP (1) | EP1369187A3 (en) |
JP (1) | JP3509810B2 (en) |
KR (1) | KR20030095164A (en) |
CA (1) | CA2392582A1 (en) |
TW (1) | TW583038B (en) |
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US20100269324A1 (en) * | 2009-04-25 | 2010-10-28 | Hong Fu Jin Precision Industry(Shenzhen) Co., Ltd. | Pressing apparatus and method |
US20120067105A1 (en) * | 2010-09-17 | 2012-03-22 | Shinji Kinoshita | Press working die assembly |
TWI511578B (en) * | 2009-05-13 | 2015-12-01 | Hon Hai Prec Ind Co Ltd | Pressing apparatus and method |
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- 2002-07-08 CA CA002392582A patent/CA2392582A1/en not_active Abandoned
- 2002-07-12 TW TW091115484A patent/TW583038B/en active
- 2002-07-12 KR KR1020020040565A patent/KR20030095164A/en not_active Application Discontinuation
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Also Published As
Publication number | Publication date |
---|---|
TW583038B (en) | 2004-04-11 |
EP1369187A3 (en) | 2004-05-19 |
JP3509810B2 (en) | 2004-03-22 |
CA2392582A1 (en) | 2003-12-07 |
EP1369187A2 (en) | 2003-12-10 |
KR20030095164A (en) | 2003-12-18 |
JP2004025188A (en) | 2004-01-29 |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: UMIX CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MATSUOKA, MITSUO;REEL/FRAME:013103/0460 Effective date: 20020613 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO PAY ISSUE FEE |