Patent Application
20100018043
1. Field of the Invention
The subject invention relates to a high speed vertical part transfer assembly for moving parts in a hydroforming assembly or a part trimming assembly.
2. Description of the Prior Art
Hydroforming generally is the use of fluid pressure to expand a blank, or a work-piece, to comply with the shape of the cavity of a die. Hydrotrimming is the process of cutting and trimming parts through the use of a hydraulic fluid. Hydroforming or hydrotrimming machines generally include a die having a cavity defining a negative mold of a final part. A work-piece is placed in the cavity of the die, and a high pressure hydraulic fluid is injected into the work-piece to cause the work-piece to conform to the shape of the negative mold.
The dies of the hydroforming and hydrotrimming assemblies of the prior art are laid horizontally with two halves moveable relative to each other parallel to a vertical-axis. A common problem with such hydroforming assemblies is that fluid and other residue is left in the final part following the hydroforming process. Similarly, the scrap material cut away from the work-piece during a hydrotrimming process must manually be removed from the die and away from the work-piece.
Other manufacturing processes, e.g. stamping, often sequentially shape a work-piece through a series of stations to form a part having a complex shape. A part transfer assembly is then required to bring the work-piece to the first station, transfer the work-piece between the stations, and remove the work-piece from the final station. An example of such a transfer assembly is disclosed in U.S. Pat. No. 7,107,383, issued on Mar. 28, 2006 to Luciano Trinidade (hereinafter referred to as “Trinidade '383”). The Trinidade '383 patent discloses a transfer system including a pair of rails extending in spaced and parallel relationship with each other and parallel to a horizontal-axis. A plurality of horizontally spaced part grabbers is disposed on each of the rails for engaging a work-piece. A plurality of transfer modules engages each of the rails for moving the rails side-to-side parallel to the horizontal-axis and for moving the rails vertically up and down parallel to a vertical-axis.
The invention relates to such a forming assembly for hydroforming or hydrotrimming a work-piece and including a left post and a right post spaced from and extending parallel to each other and parallel to a vertical-axis. A left top arm extends transversely from the left post and parallel to a horizontal in/out-axis to an outer distal end. A right top arm extends transversely from the right post and parallel to the in/out-axis to the outer distal end. A left top transfer module interconnects the left post and the left top arm for moving the left top arm in and out parallel to the in/out-axis and vertically up and down relative to the left post parallel to the vertical-axis. A right top transfer module interconnects the right post and the right top arm for moving the right top arm in and out parallel to the in/out-axis and vertically up and down relative to the right post parallel to the vertical-axis. An upper rail extends across the distal ends of the left top arm and the right top arm and parallel to a horizontal station-axis. A rail transfer module is disposed on each of the top arms and operatively connects the upper rail to the distal ends of the arms for moving the upper rail side-to-side parallel to the station-axis. At least one upper part grabber is disposed on the upper rail for engaging a work-piece.
The subject invention holds the work-piece in a vertical orientation parallel to the vertical-axis. In the hydroforming process, the work-piece is pressurized in each of the cavities of the die, and when the work-piece is removed from the cavity, the fluid along with any residue is flushed out of the work-piece by gravity. Similarly, in the hydrotrimming process, the work-piece can be trimmed in the die cavity and secondary trimming operations can be reduced or eliminated.
Other advantages of the present invention will be readily appreciated, as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings wherein:
Referring to the Figures, wherein like numerals indicate corresponding parts throughout the several views, the invention is a forming machine 20 including a transfer assembly 22 having a horizontal in/out-axis X and a horizontal station-axis Y perpendicular to the in/out-axis X and a vertical-axis Z. In the exemplary embodiment, the forming machine 20 is a hydroforming machine, but it is to be appreciated that it may also be a hydrotrimming machine.
The forming machine 20, which is generally shown in
The transfer assembly 22 is generally indicated in
The left and right posts 40, 42 are disposed on either side of the die 24 and the horizontal member 50 is disposed above the die 24 so that the die 24 can move between the open and closed positions without interfering with the posts 40, 42 or the horizontal member 50.
A left top arm 56 and a left bottom arm 58 extend in spaced and parallel relationship with each other transversely to the left post 40 and parallel to the in/out-axis X to outer distal ends 60, and a right top arm 62 and a right bottom arm 64 extend in spaced and parallel relationship with each other transversely to the right post 42 and parallel to the in/out-axis X to outer distal ends 60. The top arms 56, 62 are vertically spaced parallel to the vertical-axis Z from the bottom arms 58, 64, and all of the arms 56, 58, 62, 64 have the same length.
The left arms 56, 58, 62, 64 are horizontally spaced from the right arms 56, 58, 62, 64 parallel to the station-axis Y by an interior width Winterior being greater than the die width Wdie so that the die 24 halves 28, 30 can move between the open and closed positions without interfering with the arms 56, 58, 62, 64 of the transfer assembly 22.
A left top transfer module 66 interconnects the left post 40 and the left top arm 56 for moving the left top arm 56 in and out parallel to the in/out-axis X and vertically up and down relative to the left post 40 parallel to the vertical-axis Z. A left bottom transfer module 68 interconnects the left post 40 and the left bottom arm 58 for moving the left bottom arm 58 in and out parallel to the in/out-axis X and vertically up and down relative to the left post 40 parallel to the vertical-axis Z. A right top transfer module 70 interconnects the right post 42 and the right top arm 62 for moving the right top arm 62 in and out parallel to the in/out-axis X and vertically up and down relative to the right post 42 parallel to the vertical-axis Z. A right bottom transfer module 72 interconnects the right post 42 and the right bottom arm 64 for moving the right bottom arm 64 in and out parallel to the in/out-axis X and vertically up and down relative to the right post 42 parallel to the vertical-axis Z.
Each of the transfer modules 66, 68, 70, 72 includes a vertical servo motor 76 for moving the associated arm vertically up and down parallel to the vertical-axis Z, and each of the transfer modules 66, 68, 70, 72 includes a longitudinal servo motor 78 for moving the associated arm in and out parallel to the in/out-axis X.
An upper rail 80 extends across the outer distal ends 60 of the left top arm 56 and the right top arm 62 and parallel to the station-axis Y, and a lower rail 82 extends across the distal ends 60, 84 of the left bottom arm 58 and the right bottom arm 64 and parallel to the station-axis Y. Each of the rails 80, 82 has a rail length L between rail ends 84 greater than the distance between the arms 56, 58, 62, 64 parallel to the station-axis Y. A rail transfer module 74 is disposed on each of the arms 56, 58, 62, 64 and operatively connects the rails 80, 82 to the distal ends 60, 84 of the arms 56, 58, 62, 64 for moving the upper and lower rails 80, 82 side-to-side parallel to the station-axis Y between stop positions with one of the rail ends 84 adjacent one of the arms 56, 58, 62, 64. The upper rail 80 may be controlled independently of the movement and the position of the lower rail 82 depending on the orientation or the shape of the die 24.
A plurality of upper part grabbers 86 is disposed on the upper rail 80 for engaging the work-piece 26. The upper part grabbers 86 extend downwardly from the upper rail 80 and are horizontally spaced from each other. A plurality of lower part grabbers 88 is disposed on the lower rail 82 for engaging a work-piece 26. The lower part grabbers 88 extend upwardly from the lower rail 82 and are horizontally spaced from each other to correspond with the plurality of upper part grabbers 86.
The transfer assembly 22 includes a control system 90 for controlling the arms 56, 58, 62, 64 and the rails 80, 82. The control system 90 is programmed to engage the work-piece 26 and move it into the first station of the die 24 and is programmed for sequentially operating the part grabbers 86, 88 to engage a work-piece 26 and for operating the rail transfer modules 74 to move the rails 80, 82 horizontally parallel to the station-axis Y to move the part grabbers 86, 88 to the first cavity 36 of the die 24 and for operating the longitudinal servo motors 78 to move the arms 56, 58, 62, 64 forwardly parallel to the in/out-axis X and for operating the part grabbers 86, 88 to disengage the work-piece 26 in the first cavity 36 of the die 24 and for operating the longitudinal servo motors 78 to move the arms 56, 58, 62, 64 backwardly parallel to the in/out-axis X and for operating the vertical servo motors 76 to move the top arms 56, 62 upwardly parallel to the vertical-axis Z and the bottom arms 58, 64 downwardly parallel to the vertical-axis Z and for operating the actuator 32 of the press 25 to move the front and back halves 28, 30 of the die 24 together to a closed position to hydroform or hydrotrim the work-piece 26 and for operating the actuator 32 of the press 25 to move the front and back halves 28, of the die 24 apart into an open position.
The control system 90 is also programmed to move the work-piece 26 between stations of the die 24 and is programmed for sequentially operating the longitudinal servo motors 78 to move the arms 56, 58, 62, 64 forwardly parallel to the in/out-axis X and for operating the part grabbers 86, 88 to engage the work-piece 26 and for operating the longitudinal servo motors 78 to move the arms 56, 58, 62, 64 backwardly parallel to the in/out-axis X to remove the work-piece 26 from a first cavity 36 of the die 24 and for operating the rail transfer modules 74 to move the rails 80, 82 horizontally parallel to the station-axis Y for moving the work-piece 26 to a second cavity 38 of the die 24 and for operating the longitudinal servo motors 78 to move the arms 56, 58, 62, 64 forwardly parallel to the in/out-axis X for placing the work-piece 26 in the second cavity 38 of the die 24 and for operating the part grabbers 86, 88 to disengage the work-piece 26 in the second cavity 38 of the die 24 and for operating the longitudinal servo motors 78 to move the arms 56, 58, 62, 64 backwardly parallel to the in/out-axis X and for operating the rail transfer modules 74 to move the rails 80, 82 horizontally parallel to the station-axis Y to move the part grabbers 86, 88 back to the first cavity 36 of the die 24 and for operating the vertical servo motors 76 to move the top arms 56, 62 upwardly parallel to the vertical-axis Z and the bottom arms 58, 64 downwardly parallel to the vertical-axis Z and for operating the front and back halves 28, 30 of the die 24 to move together into a closed position to hydroform or hydrotrim the work-piece 26 and for operating the front and back halves 28, 30 of the die 24 to move apart into an open position.
The control system 90 is also programmed to remove the work-piece 26 from the final station of the die 24 and is programmed for sequentially operating the part grabbers 86, 88 to engage the work-piece 26 and for operating the longitudinal servo motors 78 to move the arms 56, 58, 62, 64 backwardly parallel to the in/out-axis X to remove the work-piece 26 from the final station of the die 24 and for operating the rail transfer modules 74 to move the rails 80, 82 horizontally parallel to the station-axis Y for moving the work-piece 26 away from the die 24 and for operating the part grabbers 86, 88 to disengage the work-piece 26.
The invention also includes a method for forming a work-piece 26 in a die 24 having at least one station and a horizontal in/out-axis X and a horizontal station-axis Y perpendicular to the in/out-axis X and a vertical-axis Z including. The method starts with the step of engaging a work-piece 26 with an upper part grabber 86 connected to an upper rail 80 extending horizontally parallel to the station-axis Y and engaging the work-piece 26 with a lower part grabber 88 connected to a lower rail 82 extending horizontally parallel to the station-axis Y. The method continues with the step of moving the upper and lower rails 80, 82 horizontally parallel to the station-axis Y to move the work-piece 26 to a first station of a die 24. The method continues with the step of moving the upper and lower rails 80, 82 forward parallel to the in/out-axis X to place the work-piece 26 in the first station. The method continues with the step of disengaging the work-piece 26 with the part grabbers 86, 88 in the first station.
The die 24 may include only a single station, or cavity, or it may include multiple stations, or cavities 36, 38. Where the die 24 includes multiple stations, the method includes the step of engaging one end of the work-piece 26 in the first cavity 36 of the die 24 with an upper part grabber 86 and engaging the other end of the work-piece 26 with a lower part grabber 88. The method continues with the step of moving the upper and lower rails 80, 82 backward parallel to the in/out-axis X to remove the work-piece 26 from the first cavity 36 of the die 24. The method further includes the step of moving the upper and lower rails 80, 82 horizontally parallel to the station-axis Y to move the work-piece 26 to a second cavity 38 of the die 24. The method further proceeds with the step of moving the upper and lower rails 80, 82 forward parallel to the in/out-axis X to place the work-piece 26 in the second cavity 38 of the die 24 and disengaging the work-piece 26 with the part grabbers 86, 88 in the second cavity 38. The continues with the step of moving the upper and lower rails 80, 82 horizontally parallel to the station-axis Y to position the part grabbers 86, 88 at the first cavity 36.
Whether the die 24 only has a single station or multiple stations, the method proceeds with the step of engaging the work-piece 26 in the last station of the die 24 with the upper part grabber 86 connected to the upper rail 80 and engaging the work-piece 26 with the lower part grabber 88 connected to the lower rail 82. The method continues with the step of moving the upper and lower rails 80, 82 backward parallel to the in/out-axis X to remove the work-piece 26 from the last station of the die 24. The method continues with the step of moving the upper and lower rails 80, 82 horizontally parallel to the station-axis Y to move the work-piece 26 away from the die 24. The method continues with the step of disengaging the work-piece 26 with the part grabbers 86, 88.
In order to move the upper and lower rails 80, 82 out of the way to make room for the die 24 to close, the method is concluded with the step of moving the upper rail 80 vertically upward parallel to the vertical-axis Z and moving the lower rail 82 vertically downward parallel to the vertical-axis Z and closing the die 24 to hydroform or hydrotrim the work-piece 26.
Obviously, many modifications and variations of the present invention are possible in light of the above teachings and may be practiced otherwise than as specifically described while within the scope of the appended claims. These antecedent recitations should be interpreted to cover any combination in which the inventive novelty exercises its utility. The use of the word “said” in the apparatus claims refers to an antecedent that is a positive recitation meant to be included in the coverage of the claims whereas the word “the” precedes a word not meant to be included in the coverage of the claims. In addition, the reference numerals in the claims are merely for convenience and are not to be read in any way as limiting.
