Method for concurrently making multiple three-dimensional objects from multiple solidifiable materials

• US 10,513,108 B2
• Filed: 02/19/2019
• Issued: 12/24/2019
• Est. Priority Date: 12/11/2015
• Status: Active Grant

• Current Assignee: Gulf Filtration Systems Inc. (Desktop Metal, Inc.)
• Original Assignee: Gulf Filtration Systems Inc. (Desktop Metal, Inc.)
• Inventors: El-Siblani, Ali
• Primary Examiner(s): Tentoni, Leo B
• Application Number:
  US16/279,342
• Publication Number:
  US 20190176458A1
• Time in Patent Office: 308 Days
• Field of Search: 264255, 2642971, 264317, 264401
• CPC Class Codes: B29C 33/448 destructible B29C33/52 takes precedence; in particular used in injection moulding B29C45/4457
• CPC Class Codes: B29C 64/124 using layers of liquid which are selectively solidified
• CPC Class Codes: B29C 64/171 specially adapted for manufacturing multiple 3D objects
• CPC Class Codes: B29C 64/176 Sequentially
• CPC Class Codes: B29C 64/182 in parallel batches
• CPC Class Codes: B29C 64/336 of two or more materials
• CPC Class Codes: B29C 64/393 for controlling or regulating additive manufacturing processes
• CPC Class Codes: B29C 64/40 Structures for supporting 3D objects during manufacture and intended to be sacrificed after completion thereof
• CPC Class Codes: B29K 2995/0005 Conductive
• CPC Class Codes: B29L 2031/753 Medical equipment; Accessories therefor bloodbags, medical bags B29L2031/7148; artificial eyes B29L2011/0008
• CPC Class Codes: B33Y 10/00 Processes of additive manufacturing
• CPC Class Codes: B33Y 50/00 Data acquisition or data processing for additive manufacturing
• CPC Class Codes: B33Y 50/02 for controlling or regulating additive manufacturing processes

Abstract

Methods and apparatuses for making multiple three-dimensional objects from multiple solidifiable materials are shown and described. In accordance with the method, the objects are designed with variable removable support heights along the build axis so that each object has an interface between first and second materials that is the same height from the build platform. The technique simplifies the process of producing multiple three-dimensional objects from multiple solidifiable materials which may have different build axis heights of first and second finished object sections so that the sources of solidifiable materials need only be switched once during the building of multiple objects.

Claims

1. A method of making a selected number of finished three-dimensional objects on a build platform, comprising:

placing a source of a first solidifiable object material in alignment with the build platform;

forming a number of partially-formed three-dimensional objects from the first solidifiable material, wherein the number is the selected number, each partially-formed three-dimensional object has a first end attached to the build platform and a second end spaced apart from the build platform along a build axis, each partially-formed object has a removable support section comprising the first end and a first object section comprising the second end, and each second end of each partially-formed three-dimensional object is spaced apart from the build platform by the same distance along the build axis;

placing a source of a second solidifiable material in alignment with the build platform;

solidifying the second solidifiable material into a number of second object sections, wherein the number of second object sections is the selected number, and each second object section is connected to the second end of a corresponding partially formed three-dimensional object from the number of partially formed three-dimensional objects, thereby yielding a number of supported three-dimensional objects wherein the number of supported three-dimensional objects is the selected number;

removing the support sections from each of the supported three-dimensional objects to yield the selected number of finished three-dimensional objects, wherein at least some of the first object sections of the finished three-dimensional objects have different build axis heights.

2. The method of claim 1, wherein the step of placing the source of a first solidifiable object material in alignment with the build platform comprises positioning the source of the first solidifiable object material and the build platform such that the source of the first solidifiable object material and the build platform overlap when viewed along the build axis.

3. The method of claim 2, further comprising placing the source of the second solidifiable object material out of alignment with the build platform such that the source of the second solidifiable material and the build platform do not overlap when viewed along the build axis.

4. The method of claim 1, wherein the step of forming the number of partially formed three-dimensional objects from the first solidifiable material comprises solidifying a number of regions of a number of layers of the first solidifiable object material.

5. The method of claim 4, wherein the step of solidifying the second solidifiable material into a number of second object sections comprises solidifying a number of layers of the second solidifiable material corresponding to each finished object in contact with the second end of a corresponding one of the partially-formed three-dimensional objects.

6. The method of claim 1, wherein the step of forming a number of partially-formed three-dimensional objects from the first solidifiable object material comprises supplying solidification energy from a digital light projector to the first solidifiable object material in a first sequence of two-dimensional energy patterns, wherein the first sequence of two-dimensional energy patterns defines each of the partially-formed three-dimensional objects.

7. The method of claim 6, wherein the step of solidifying the second solidifiable object material into a number of second object sections comprises supplying solidification energy from a digital light projector to the second solidifiable object material in a second sequence of energy patterns, wherein the second sequence of energy patterns defines each of the second object sections.

8. The method of claim 1, wherein the step of forming a number of partially-formed three-dimensional objects from the first solidifiable material comprises scanning solidification energy onto the first solidifiable material in a first sequence of sets of linear energy scans, wherein the first sequence of linear energy scans defines one of the partially-formed objects.

9. The method of claim 6, wherein the step of solidifying the second solidifiable material into a number of second object sections comprises scanning solidification energy onto the second solidifiable material in a second sequence of sets of linear energy scans, wherein the second sequence of sets of linear energy scans defines each of the second object sections.

10. The method of claim 1, wherein the step of placing the source of the first solidifiable object material in alignment with the build platform comprises translating the source of the first solidifiable object material and the build platform relative to one another.

11. The method of claim 10, wherein the step of placing the source of the second solidifiable object material in alignment with the build platform comprises translating the source of the second solidifiable object material and the build platform relative to one another.

12. The method of claim 1, wherein the step of placing the source of the first solidifiable object material in alignment with the build platform comprises rotating the build platform around the build axis.

13. A method of concurrently making a plurality of finished three-dimensional objects from multiple solidifiable materials on a build platform, comprising:

providing object data representative of the three-dimensional objects, wherein the object data defines a spacing between each object and the build platform and an interface between a first object section formed from a first solidifiable object material and a second object section formed from a second solidifiable object material;

modifying the object data to adjust the position of each object relative to the build platform such that each object'"'"'s interface is spaced apart from the build platform by the same distance along a build axis;

solidifying a first solidifiable object material to create respective support sections attached to the build platform and positioned between each object and the build platform;

solidifying the first solidifiable object material to form each object'"'"'s first object section such that each object'"'"'s first object section is connected to the object'"'"'s support section; and

solidifying the second solidifiable object material to form each object'"'"'s second object section, wherein at least some of the first object sections of the plurality of three-dimensional objects have different heights along the build axis.

14. The method of claim 13, wherein the three-dimensional objects in the plurality of three-dimensional objects are hearing aids.

15. The method of claim 13, further comprising selectively aligning the build platform and a source of the first solidifiable object material.

16. The method of claim 15, further comprising selectively aligning the build platform and source of the second solidifiable object material.

17. The method of claim 13, wherein during the entire process of building the plurality of three-dimensional objects, only one solidifiable material switching event occurs, and the solidifiable material switching event comprises aligning the build platform with a source of the second solidifiable material.

18. The method of claim 13, wherein the step of solidifying a first solidifiable object material to create respective support sections attached to the build platform and positioned between each object and the build platform comprises solidifying the first solidifiable object material with a two-dimensional pattern generator.

19. The method of claim 13, wherein the step of solidifying a first solidifiable object material to create respective support sections attached to the build platform and positioned between each object and the build platform comprises solidifying the first solidifiable object material with a linear solidification device that moves along a travel axis while selectively scanning solidification energy along a scanning axis.

20. The method of claim 13, further comprising removing the support sections from the first object sections of each object to yield the plurality of finished three-dimensional objects.