Apparatus and method for creating three-dimensional modeling data from an object

• US 5,621,648 A
• Filed: 08/02/1994
• Issued: 04/15/1997
• Est. Priority Date: 08/02/1994
• Status: Expired due to Term

• Current Assignee: Crump Group Incorporated
• Original Assignee: Crump, Craig D.
• Inventors: Crump, Craig D.
• Primary Examiner(s): Gordon, Paul P.
• Application Number:
  US08/284,253
• Time in Patent Office: 987 Days
• Field of Search: 364/468, 364/478, 364/474.03, 364/474.24, 364/470, 364/167.01, 364/474.28, 364/474.34
• US Class Current: 700/112
• CPC Class Codes: G06T 17/00 Three dimensional [3D] modelling, e.g. data description of 3D objects
• CPC Class Codes: G06T 17/10 Constructive solid geometry [CSG] using solid primitives, e.g. cylinders, cubes

Abstract

The present invention provides a method and apparatus for the creation of a electronic domain geometric modeling data file containing internal and external features of an object of interest by first successively removing contours of material forming the object to form exposed surfaces and thereby reveal the internal and external features contour by contour and second by subsequently, successively acquiring data relative to the exposed surfaces. The geometry of each exposed surface is obtained, processed and recorded after each contour is removed. The processing is converted to perimeter data to define the internal and external features and surfaces of the object and the perimeter data is combined to yield a three dimensional electronic domain representation of the object. If desired this representation can be displayed on a computer monitor or printed onto paper. In a representative embodiment of the present invention a face mill is provided to remove the contours, a scanner is used to obtain the data relative to the exposed surfaces, and a shuttle is used to transport the object between the mill and the scanner for alternating steps of material removal and scanning.

Claims

1. Apparatus for producing electronic data representations of an object, the object being formed from at least one material, said apparatus comprising:

a material removal station;

a data gathering station; and

a shuttle providing relative movement of the object between said stations;

wherein said material removal station comprises;

means for removing a predetermined layer of material from the object;

wherein said data gathering station comprises;

means for successively imaging the object after removal of a predetermined layer; and

means for storing data gathered by said means for imaging; and

wherein said shuttle comprises;

a table for holding the object;

means for moving said table in a first, substantially linear direction between a first position in which said table is at said data gathering station in imaging alignment with said means for successively imaging the object, and a second position in which said table is at said material removal station in material removing alignment with said means for removing a layer of material; and

a first sensor for determining when said table is at said data gathering station in imaging alignment with said means for successively imaging the object;

means for moving said table in a second direction substantially perpendicular to said first direction into and out of relative material removing engagement with said means for removing a pre-determined layer of material; and

a second sensor for determining when said table is at said material removing station in relative material removing engagement with said means for removing material.

2. The apparatus of claim 1 wherein said data gathering station further comprises means for manipulating data gathered by said imaging means and stored in said data storage means to produce a three-dimensional drawing of the object.

3. Apparatus for producing electronic data representations of an object, the object being formed from at least one material, said apparatus comprising:

a material removal station;

a data gathering station; and

a shuttle providing relative movement of the object between said stations;

wherein said material removal station comprises;

means for removing a predetermined layer of material from the object to expose a surface;

wherein said data gathering station comprises;

means for successively imaging the exposed surface of the object after removal of a predetermined layer; and

means for storing data gathered by said means for imaging; and

wherein said shuttle comprises;

a table for holding the object;

means for providing relative movement of said table between said material removal station and said data gathering station;

wherein said means for moving said table comprises;

means for moving said table in a first, substantially linear direction between a first position in which said table is at said data gathering station in imaging alignment with said means for successively imaging the object, and a

second position in which said table is at said material removal station in material removing alignment with said means for removing a predetermined layer of material from the object, said first direction moving means comprising;

a screw drive having first and second ends;

a first motor, said motor being drivingly attached to said first end of said drive, said second end of said screw drive being rotationally mounted by a bearing; and

a nut threadingly engaging said screw, said table being mounted to said nut.

4. The apparatus of claim 3 wherein the object is encased within an encasing material to form an encasement and wherein the layer removing means removes a predetermined layer of the encasement.

5. The apparatus of claim 3 wherein said means for moving said table further comprises:

means for moving said table in a second direction substantially perpendicular to said first direction to move said table into and out of relative material removing engagement with said means for removing a layer of material, said second direction moving means comprising;

a plurality of screw drive legs, each said screw drive leg threadably mounting a nut thereto, said nuts mounting said first direction moving means for motion in said second direction; and

a second motor, said second motor drivingly connected to said screw drive legs.

6. The apparatus of claim 5, and further comprising:

a sensor for determining when said table is at said material removal station in relative material removing engagement with said means for removing a predetermined layer of material.

7. The apparatus of claim 3 wherein said means for removing a predetermined layer of material comprises a cutting head including at least one cutting insert, said cutting head being rotated such that all inserts are cutting material in a common plane and wherein movement in said first direction is substantially parallel to said common plane such that a planar surface of the object is exposed by the removal of material therefrom.

8. The apparatus of claim 3 wherein the removal of the predetermined layer exposes an object surface and an encasing material surface and wherein the object surface contrasts with the encasing material surface so that a line of demarcation may be determined between the surfaces.

9. The apparatus of claim 3, wherein said predetermined layer is of substantially uniform thickness.

10. The apparatus of claim 3 wherein said data gathering station further comprises means manipulating data gathered by said imaging and stored in said data storage means to produce a three-dimensional drawing of the object.

11. A method for producing electronic data representations of an object having a plurality of surfaces, said method comprising:

encasing the object within a preselected encasing material to form an encasement, such encasing being done so that all surfaces of the object are coated with the encasing material and so that the encasing material substantially fills all interior volumes of the object;

removing successively from the encasement a plurality of layers of material, each layer of material removed having predetermined dimensions of length, width and depth and a predetermined geometric shape, so as to expose an encasement surface, and assigning a value to each layer representative of its elevation within the object;

acquiring an electronic representation of selected exposed encasement surfaces after a predetermined layer has been removed; and

processing each electronic representation to create a predetermined electronic representation of each said encasement surface.

12. The method of claim 11 wherein said selected electronic representation is a solid model of the object and wherein said processing step includes converting each electronic representation into a layered point cloud representative of the object.

13. The method of claim 12 wherein said method further comprises lofting a surface onto each layered point cloud.

14. The method of claim 13 wherein said method further comprises importing each said layer into CAD space and stacking the layers according to their assigned elevation value.

15. The method of claim 14 and further including creating a solid between adjacent layers.

16. The method of claim 11 wherein said selected electronic representation is a solid model of the object.

17. The method of claim 11 wherein said selected electronic representation is a surface model of the object.

18. The method of claim 11 wherein said contour removing step removes contour of material such that successively exposed surfaces of the object are substantially parallel to each other, said method further including:

identifying a feature of interest in the object; and

orienting the object such that the exposed surfaces of the object are non-parallel to the feature of interest so that at least one exposed surface extends through the feature of interest.

19. The method of claim 11 wherein said acquiring step includes scanning each encasement surface using a scanner to create a scanned image of each encasement surface.

20. The method of claim 11 wherein said selected electronic representation is a surface model of the object and wherein said processing step includes convening each electronic representation into a line an drawing defining the perimeter edges of the internal and external edges of the object.

21. The method of claim 20 wherein said processing step further includes stacking said line art drawings and lofting a surface thereon.

22. The method of claim 20 wherein said processing step further includes converting said line art drawings into a vector data file.

23. The method of claim 22 wherein said processing step further includes importing said vector data file into 3D CAD space and lofting a surface thereon.

24. The method of claim 11 wherein said layers have upper and lower surfaces and a substantially uniform thickness, said upper and lower surfaces being substantially parallel to each other.

25. The method of claim 11 wherein said electronic representation is a raster planar image and wherein said processing step further includes importing said raster planar image into 3D CAD space and converting the imported images into a solid model of the object.

26. The method of claim 11 wherein said layers have upper and lower surfaces being substantially parallel to each other and wherein said layers increase in thickness as successive layers of the encasement are removed to form each said predetermined contour.

27. The method of claim 11 wherein said layers have upper and lower surfaces being substantially parallel to each other and wherein said layers decrease in thickness as successive layers of the encasement are removed to form each said predetermined contour.

28. The method of claim 11 wherein said predetermined contour has a substantially uniform thickness.