Increasing strength in a metal sheet

Abstract

Various aspects of the subject technology relate to methods and systems for strengthening a metallic alloy during machining. The method includes providing a metallic alloy. The method can include flattening a portion of the metallic alloy. The method can include forming a workpiece from the flattened portion of the metallic alloy, wherein the workpiece comprises a top surface and a bottom surface. The method can also include stamping a first dimple profile on a top surface of the workpiece, wherein a dimple profile comprises a plurality of dimple indentations into a surface of the workpiece. The method can also include stamping a second dimple profile on the bottom surface of the workpiece. The disclosure further comprises an apparatus configured to form a workpiece comprising a plurality of dimple profiles oriented in the workpiece to strengthen the workpiece.

What is claimed is: 
     
         1 . A method for strengthening metallic alloys, comprising:
 providing a metallic alloy;   flattening a portion of the metallic alloy;   forming a workpiece from the flattened portion of the metallic alloy, wherein the workpiece comprises a top surface and a bottom surface, the workpiece defined by a thickness dimension between the top surface and bottom surface; and   stamping a first dimple profile on a top surface of the workpiece, wherein a dimple profile comprises a plurality of dimple indentations into a surface of the workpiece.   
     
     
         2 . The method of  claim 1 , further comprising stamping a second dimple profile to the bottom surface. 
     
     
         3 . The method of  claim 2 , further comprising aligning the second dimple profile at an offset distance from a first tooling associated with the first dimple profile. 
     
     
         4 . The method of  claim 2 , wherein the first dimple profile and the second dimple profile comprise a plurality of dimple indentation wherein the dimple indentation includes a depth dimension and the depth dimension associated with the first dimple profile is greater than the depth dimension associated with the second dimple profile. 
     
     
         5 . The method of  claim 1 , further comprising flattening the workpiece to increase mechanical strength. 
     
     
         6 . The method of  claim 1 , wherein forming the metallic alloy into a workpiece comprises trimming a portion of the workpiece from a peripheral region of the workpiece. 
     
     
         7 . The method of  claim 1 , wherein a depth of the first dimple profile maintains a surface integrity of the bottom surface. 
     
     
         8 . The method of  claim 1 , wherein a depth of a second dimple profile maintains a surface integrity of the top surface. 
     
     
         9 . The method of  claim 1 , wherein the metallic alloy comprises an aluminum alloy including approximately 95.7-97.7 mass % Al, approximately 0.15-0.35 mass % Cr, approximately 0.1 mass % Cu and approximately 0.4 mass % Fe. 
     
     
         10 . The method of  claim 1 , wherein a first dimple dimension ranges from approximately 0.1 mm to 0.4 mm. 
     
     
         11 . An apparatus configured to generate a metallic alloy part configured for integration in a head mounted display, wherein the apparatus comprises:
 a feeder configured to provide the metallic alloy;   a forming device configured to:
 flatten a portion of the metallic alloy; 
 form a workpiece from the flattened portion of the metallic alloy, wherein the workpiece comprises a top surface and a bottom surface, the workpiece defined by a thickness dimension between the top surface and bottom surface; and 
 stamp a first dimple profile on a top surface of the workpiece, wherein a dimple profile comprises a plurality of dimple indentations into a surface of the workpiece. 
   
     
     
         12 . The apparatus of  claim 11 , wherein the forming device is further configured to stamp a second dimple profile to the bottom surface. 
     
     
         13 . The apparatus of  claim 12 , wherein the forming device is further configured to align the second dimple profile at an offset distance from a first tooling associated with the first dimple profile. 
     
     
         14 . The apparatus of  claim 12 , wherein the first dimple profile and the second dimple profile comprise a plurality of dimple indentations, wherein a dimple indentation includes a depth dimension and the depth dimension associated with the first dimple profile is greater than the depth dimension associated with the second dimple profile. 
     
     
         15 . The apparatus of  claim 12 , wherein the forming device is further configured to flatten the workpiece to increase mechanical strength. 
     
     
         16 . The apparatus of  claim 12 , wherein the forming device is further configured to trim a portion of the workpiece from a peripheral region of the workpiece. 
     
     
         17 . The apparatus of  claim 12 , wherein the thickness dimension of a workpiece is greater than a depth dimension associated with the first dimple profile and the thickness dimension of the workpiece is greater than the depth dimension associated with the second dimple profile. 
     
     
         18 . A metallic alloy part configured for integration in a head mounted display, wherein the metallic alloy part comprises:
 a substrate comprising a top surface and a bottom surface, defined by a thickness dimension between the top surface and bottom surface, wherein a first region associated with the top surface comprises a first dimple profile and a second region associated with the bottom surface comprises a second dimple profile, the second dimple profile oriented at an offset distance from the first dimple profile, wherein the first dimple profile and the second dimple profile comprise a plurality of dimple indentation wherein the dimple indentation includes a depth dimension and the depth dimension associated with the first dimple profile is greater than the depth dimension associated with the second dimple profile.   
     
     
         19 . The metallic alloy part of  claim 18 , wherein the thickness dimension of the substrate is greater than the depth dimension associated with the first dimple profile and the thickness dimension of the substrate is greater than the depth dimension associated with the second dimple profile. 
     
     
         20 . The metallic alloy of  claim 19  comprises an aluminum alloy including approximately 95.7-97.7 mass % Al, approximately 0.15-0.35 mass % Cr, approximately 0.1 mass % Cu and approximately 0.4 mass % Fe.