Method and apparatus for printing 3D objects using additive manufacturing and material extruder with translational and rotational axes

Patent metadata

Field	Value
Publication number	US-9481131-B2
Application number	US-201313945223-A
Country	US
Kind code	B2
Filing date	Jul 18, 2013
Priority date	Jul 18, 2013
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

A 5D printer, which additively manufactures an object, includes an extruder that can move linearly along three orthogonal axes and rotationally around at least one of the axes with respect to the object while depositing a material. A gantry is movable along X, Y and Z axes, and a trunnion table movable about A and B axes is mounted on the gantry. A platen is mounted on the trunnion table, and the extruder deposits the material on the platen while moving the gantry and trunnion table. A model of the object is analyzed to produce a stress tensor for the object, and the depositing is according to the stress tensor.

First claim

We claim:

1. An apparatus for additively manufacturing an object from a thermoplastic material having dimensions, comprising:
an extruder configured to move, with respect to the object while depositing the thermoplastic material, wherein the deposited thermoplastic material exhibits an anisotropic tensile strength along an axis of a direction of deposition, and a pattern of the depositing is selected to deposit the thermoplastic material in the object according to, in a stress analysis of a predetermined object model of the object, different tensile loads directed along axes of the object, according to an array of predetermined 3D tensile stresses of the predetermined object model of the object under stress, while substantially maintaining the same dimensions of the object as configured for manufacture.

2. The apparatus of claim 1 , further comprising:
a gantry movable along X, Y and Z axes;
a trunnion table, movable about A and B axes, mounted on the gantry; and
a platen mounted on the trunnion table, wherein the extruder deposits the thermoplastic material on the platen while moving the gantry and trunnion table.

3. The apparatus of claim 1 , wherein the object includes a removable support.

4. The apparatus of claim 3 , wherein the object has a greater tensile strength than the removable support.

5. The apparatus of claim 1 , further comprising:
a processor configured to analyze the predetermined object model of the object and to produce the array of stress tensors for the object.

6. The apparatus of claim 5 , wherein the object has a near optimal strength to weight ratio, and near constant wall thickness.

7. The apparatus of claim 1 , wherein a pattern for the depositing the thermoplastic material is determined stochastically.

8. The apparatus of claim 1 , wherein a pattern for the depositing the thermoplastic material is determined deterministically.

9. The apparatus of claim 5 , wherein the array of stress tensors are determined using a finite element model.

10. The apparatus of claim 5 , wherein the array of stress tensors are determined by a performance specification of the object.

11. The apparatus of claim 5 , wherein the array of stress tensors are selected from a predetermined library of shapes.

12. The apparatus of claim 5 , wherein the object is tested to destruction, and the array of stress tensors are updated according to a failure mode.

13. The apparatus of claim 12 , wherein the depositing, testing and updating is performed iteratively.

14. The apparatus of claim 1 , wherein the extruder is rotatable.

15. The apparatus of claim 14 , wherein the extruder is J shaped.

16. The apparatus of claim 14 , wherein the extruder includes rifling.

17. The apparatus of claim 1 , wherein a path of the extruder is optimized in order of an increasing Z height.

18. The apparatus of claim 1 , wherein a path of the extruder is optimized for minimizing a production time.

19. The apparatus of claim 1 , wherein a path of the extruder is optimized for maximizing a strength of the object.

20. The apparatus of claim 1 , wherein a path of the extruder is optimized for minimizing material usages.

21. The apparatus of claim 1 , wherein the extruder includes an ultrasonic transducer to assist bonding of the thermoplastic material, such that an ultrasonic acoustic energy is applied to the thermoplastic material to achieve a solid-state bond.

22. A method for additively manufacturing an object from a thermoplastic material having dimensions, comprising the steps of:
employing a processor executing computer executable instructions stored on a computer readable memory to facilitate performing the steps of:
using a computer aided design (CAD) module to generate a model of the object;
analyzing the model to determine distributions of stresses present when the object is under stress, resulting in providing volumetric stress tensor data;
moving an extruder linearly along three orthogonal axes and rotationally around at least one of the axes; and
depositing the thermoplastic material while moving to manufacture the object, wherein the deposited thermoplastic material exhibits an anisotropic tensile strength along an axis of a direction of deposition, and a pattern of the depositing is selected to deposit the thermoplastic material in the object according to, in a stress analysis of a model of the object, different tensile loads directed along axes of the object, according to an array of predetermined 3D tensile stresses of the model of the object under stress via the volumetric stress tensor data, while substantially maintaining the same dimensions of the object as configured for manufacture.

23. The apparatus of claim 1 , wherein the pattern of the depositing optimizes a strength of the object with respect to a stress tensor.

24. The apparatus of claim 1 , wherein the object is a spherical pressure tank, such that the pattern of the depositing includes a tessellation by geometric dispersions to produce a constant wall thickness that optimizes a strength to a weight ratio.

Assignees

• Mitsubishi Electric Res Laboratories Inc

Inventors

• Yerazunis William S
• Barnwell Iii John C
• Katz Joseph
• Brinkman Dirk

Classifications

• B29C64/232

  for motion along the axis orthogonal to the plane of a layer · CPC title

• B29C64/236

  for motion in a direction within the plane of a layer · CPC title

• B29C64/241

  for rotary motion · CPC title

• B29C64/393

  for controlling or regulating additive manufacturing processes · CPC title

• G05B2219/35134

  3-D cad-cam · CPC title