Abstract:
An additive manufacturing assembly includes a work space including a plurality of separate regions and an energy transmitting device for focusing an energy beam to a specific location within one of the plurality of regions within the work space. The energy transmitting device includes features for expanding the workspace for fabricating parts of increased size and volume.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims priority to U.S. Provisional Application No. 61/556,990 that was filed on Nov. 8, 2011. 
     
    
     BACKGROUND 
       [0002]    This disclosure generally relates to an LASER configuration for an additive manufacturing machine and process. More particularly, this disclosure relates to a LASER configuration for improving coverage area for increasing possible overall part area and volume. 
         [0003]    Typical manufacturing methods include various methods of removing material from a starting blank of material to form a desired completed part shape. Such methods utilize cutting tools to remove material to form holes, surfaces, overall shapes and more by subtracting material from the starting material. Such subtractive manufacturing methods impart physical limits on the final shape of a completed part. Additive manufacturing methods form desired part shapes by adding one layer at a time and therefore provide for the formation of part shapes and geometries that would not be feasible in part constructed utilizing traditional subtractive manufacturing methods. 
         [0004]    Additive manufacturing utilizes a heat source such as a laser beam to melt layers of powdered metal to form the desired part configuration layer upon layer. The laser forms a melt pool in the powdered metal that solidifies. Another layer of powdered material is then spread over the formerly solidified part and melted to the previous melted layer to build a desired part geometry layer upon layer. 
         [0005]    The size and shape of a part formed by additive manufacturing is dependent on the size of the envelope in which the laser can be applied to a surface. The range in which a laser can generate a desired focal point can limit the additive manufacturing space and thereby the feasible size of a desired part. 
       SUMMARY 
       [0006]    An additive manufacturing assembly according to an exemplary embodiment of this disclosure, among other possible things includes a work space including a plurality of separate regions, an energy transmitting device for focusing an energy beam to a specific location within one of the plurality of regions within the work space, and a splitter for dividing the energy beam to focus energy to a location within at least two of the plurality of separate regions of the work space. 
         [0007]    In a further embodiment of the foregoing additive manufacturing assembly, the splitter simultaneously divides the energy beam into each of the plurality of regions within the work space. 
         [0008]    In a further embodiment of any of the foregoing additive manufacturing assemblies, the splitter directs each of the energy beams separately within each of the plurality of regions. 
         [0009]    In a further embodiment of any of the foregoing additive manufacturing assemblies, the splitter comprise a plurality of directing features controllable for focusing energy from the energy transmitting device within each of the plurality of separate regions. 
         [0010]    In a further embodiment of any of the foregoing additive manufacturing assemblies, the energy-transmitting device comprises a Laser beam. 
         [0011]    A method of additive manufacturing according to an exemplary embodiment of this disclosure, among other possible things includes the steps of defining a work space including a plurality of regions, defining a part configuration, applying a layer of material over the work space, splitting a single energy beam into a plurality of energy beams, and directing each of the plurality of energy beams into the work space for melting the material within the work space according to the defined part configuration. 
         [0012]    In a further embodiment of the foregoing additive manufacturing method including splitting the energy beam such that one of the plurality of energy beams is directed simultaneously into each of the plurality of regions within the work space. 
         [0013]    In a further embodiment of any of the foregoing additive manufacturing methods further including separately controlling each of the energy beams within each of the plurality of regions. 
         [0014]    An additive manufacturing assembly according to another exemplary embodiment including, among other things, a work space including a plurality of separate regions, an energy transmitting device for focusing an energy beam to a specific location within the work space, and a transit supporting the energy transmitting device, the transit movable relative to the work space for positioning the energy transmitting device relative to the workspace for focusing the energy beam within each of the plurality of separate regions. 
         [0015]    In a further embodiment of the foregoing additive manufacturing assembly a controller governs movement of the transit relative to the workspace. 
         [0016]    In a further embodiment of any of the foregoing additive manufacturing assemblies, the energy transmitting device produces a plurality of separate energy beams that focus energy separately on different regions within the workspace. 
         [0017]    In a further embodiment of any of the foregoing additive manufacturing assemblies, the energy transmitting device comprises a plurality of separately controllable energy transmitting devices. 
         [0018]    An additive manufacturing assembly according to another exemplary embodiment including, among other things, a workspace including a plurality of separate regions, a plurality of energy transmitting devices corresponding with the plurality of separate regions of the workspace, each of the plurality of energy transmitting devices separately controllable for focusing an energy beam within the workspace, and a controller for coordinating actuation of the plurality of energy transmitting devices. 
         [0019]    The additive manufacturing assembly of the foregoing embodiment, including overlapping zones between adjacent ones of the plurality of separate regions of the workspace and each of the plurality of energy transmitting devices are arranged to transmit energy within the corresponding overlapping zones. 
         [0020]    The additive manufacturing assembly of any of the foregoing embodiments wherein each of the plurality of energy transmitting devices directs energy to a surface of a corresponding one of the separate regions of the workspace. 
         [0021]    A method of additive manufacturing according to another exemplary embodiment including, among other things, the steps of defining a work space including a plurality of regions, defining a part configuration, applying a layer of material over the work space and directing a plurality of energy beams into the work space for melting the material within the work space according to the defined part configuration. 
         [0022]    The method of additive manufacturing according to the foregoing embodiment, including directing each of the plurality of energy beams into separate ones of the plurality of regions and separately controlling each of the plurality of energy beams independent of the other ones of the plurality of energy beams. 
         [0023]    The method of additive manufacturing according to any of the foregoing embodiments including defining overlapping regions between each of the plurality of regions defined in the workspace and controlling each of the plurality of energy beams to direct energy into corresponding overlapping regions. 
         [0024]    Although the different examples have the specific components shown in the illustrations, embodiments of this invention are not limited to those particular combinations. It is possible to use some of the components or features from one of the examples in combination with features or components from another one of the examples. 
         [0025]    These and other features disclosed herein can be best understood from the following specification and drawings, the following of which is a brief description. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0026]      FIG. 1  is a schematic perspective view of an additive manufacturing assembly. 
           [0027]      FIG. 2  is a side schematic view of the example additive manufacturing assembly. 
           [0028]      FIG. 3  is a top schematic view of another example additive manufacturing assembly. 
           [0029]      FIG. 4  is a side schematic view of the example additive manufacturing assembly shown in  FIG. 3 . 
           [0030]      FIG. 5  is a top schematic view of another additive manufacturing assembly. 
           [0031]      FIG. 6  is a side view of the example additive manufacturing assembly shown in  FIG. 5 . 
       
    
    
     DETAILED DESCRIPTION 
       [0032]    Referring to  FIG. 1 , an example additive manufacturing assembly  10  includes a workspace  12 , an energy-directing device  32  that emits an energy beam  34 , a material dispersal device  28 , and a controller  40 . The example energy-directing device  32  emits a laser beam  34  into the workspace for melting portions of material  30  spread over a support  24  provided in the workspace  12 . The example assembly  10  provides for the fabrication of an example part  26  layer by layer by repeated and subsequent melting of layers of material set out by the dispersal device  28 . In this example, the dispersal device  28  lays a layer of metal powder of a composition desired for the completed part  26 . It should be understood that other material are also within the contemplation of this disclosure. 
         [0033]    The example workspace  12  is divided into a plurality of regions  14  with overlapping regions  16  disposed between adjacent ones of the regions  14 . The example workspace  12  includes a width  22 , a length  20 , and a height  18 . The volume and space provided within the workspace  12  has been limited in the past by the capabilities of the energy-transmitting device  32 . In this example, the energy-transmitting device  32  emits a single primary beam  34  that is directed through a splitter  36 . The splitter  36  divides the primary beam  34  into a plurality of secondary beams  38  that are separately and independently directed to different regions  14  within the workspace  12 . Direction of the various beams  38  is governed by the configuration of the part and controlled by the controller  40  in conjunction with operation of the powder dispersal device  28 . 
         [0034]    Referring to  FIG. 2 , with continued reference to  FIG. 1 , the example energy-transmitting device  32  transmits the primary beam  34  that in this example is a laser beam through the splitter  36  to generate a plurality of secondary beams  38 . The splitter  36  includes a plurality of energy directing elements  42 . Each of the energy directing elements  42  are individually movable in response to directions from the controller  40  to direct each of the secondary beams  38  into separate regions  14  of the workspace  12 . Splitting the main beam  34  into a plurality of secondary beams  36  provides for the fabrication of a part  26  with larger dimensions and greater volume within the increased size of the example workspace  12  over a workspace limited to only single energy beam. 
         [0035]    Referring to  FIGS. 3 and 4 , another example additive manufacturing device  44  includes energy transmitting devices  48  supported on a transit assembly  46 . In this example, the energy transmitting devices  48  emit a laser beam  50 . The transit assembly  46  provides for movement of the laser beams  50  throughout the workspace  12  to increase the overall range in which energy can be directed over the desired part  26 . The increased range provides for an increased size and volume of a part that may be fabricated within the workspace  12 . In this example, the transit  46  includes a first carriage  52  that moves along a width of the workspace  12  in a first direction indicated by arrows  56 . The transit  46  also includes a second carriage  54  that moves on the first carriage  52  in a second direction indicated by arrows  58 . Movement of the transit  52  throughout the workspace  12  provides for increases in the workspace area  12  and thereby provides for fabrication of parts with an increased size and volume. 
         [0036]    In this example, a plurality of laser transmitting devices  48  are supported on the second carriage  54 , however a single laser transmitting device  48  is also within the contemplation of this disclosure. Each of the plurality of laser transmitting devices  48  emit a separate laser beam  50  that is independently and separately movable for directing energy over separate portions of the part  26 . This independent direction of energy provides for the desired increased volume of a desired part configuration  26 . The controller  40  governs operation of the transit  46  and each of the plurality of laser beams  48  within the workspace  12  to coordinate selective melting of the powder metal material  30  in different locations to create the desired part. 
         [0037]    Referring to  FIGS. 5 and 6 , another disclosed example additive manufacturing system  60  includes a plurality of energy directing devices  62  that direct laser beams  64  within a corresponding one of the regions  14  of within the workspace  12 . The multiple energy beams  62  are separately and independently movable to direct energy within the corresponding region  14  while beams in other regions  14  are also generating and melting powdered material to form a part according to a predefined part configuration. Multiple, separate concurrently acting laser beams  64  increase the reasonable part size and volume that can be fabricated within a reasonable period. 
         [0038]    In this example, each of the laser beams  64  is adapted to be directed into a corresponding overlapping area  16 . The overlapping areas  16  include a portion of area within adjacent regions  14 . The overlapping extension of each of the laser beams  64  provides for a consistent melting of powdered metal at the boundaries separating the regions. The overlapping portions  16  and melting provided by adjacent beams  64  in adjacent regions  14  prevents undesired incomplete melting, or possible knit lines within a completed part. In other words, each of the laser beams  64  are capable of being directed to the overlapping region such that the part fabricated will include a complete melting and coverage of the metal powder during formation of a desired part configuration. 
         [0039]    Accordingly, the disclosed example additive manufacturing devices provide for the increase in workspace size, thereby providing for a corresponding increase in possible part size and volume that can be produced within a reasonable time. 
         [0040]    Although an example embodiment has been disclosed, a worker of ordinary skill in this art would recognize that certain modifications would come within the scope of this disclosure. For that reason, the following claims should be studied to determine the scope and content of this invention.