MJF Process

1. Design Specification

Respective account manager will convert the 3D drawing file provided by customer to STL file format and examine if the file meets the standard requirements such as size, structure, thickness of parts and other elements. To check if there are problems with the file, and make quick diagnosis and rectification. Then, make a confirmation about materials, technics and finishing process with customer. (Software includes Rhino 6, Magics 20.03 64bit)

1. Design Specification

2. Order Confirmation

The material of the MJF process is HP 7500 high-performance nylon, belongs to the PA12 category. Confirm with customers regarding delivery time, quantity, invoices, receipts, information of the consignee, special requirements and other details hence order can be placed quickly.

3. Review

Our expert team will check if the file meets the printing standard (minimum thickness, size, and depth of the aperture).

4. Programming and Typesetting

4. Programming and Typesetting

Programming: It is a process to determine the part placement mode. MJF Powder printing does not need support structures. The printing effect depends on the part placement and position of constructions. Since the printing effect inclined according to the structure and height, hence the printing layout should incline 45 degree.

Typesetting: The machine is automatically placed in the build chamber and stacked until the work package is filled.

5. Printing

The specific process of MJF technology can be divided into 4 steps:

  • Preheat the powder to molten state
  • Lay powder on the workbench
  • Print nozzle spray melting Auxiliary Agent and Fine Agent
  • Continuous heating melts and forms the material

Repeat the above steps, stack them layer by layer, and finally print the parts we need.

5. Printing
6. Offload Part

6. Offload Part

Cooling: After printing finished, the construction will be removed from the printing module and pushed into the post-processing module to start cooling. The post-processing station can cool the construction quickly, which significantly improves the production efficiency.

Disassembly: Split the cooled package and the molten powder will be found by the worker while the unmolded nylon is still in the powder state, and the worker will recycle the powder material for reuse.

7. Post-processing

Sandblasting: The main purpose of sandblasting is to remove the powder material from the surface of the part. The unwrapped part placed in the sandblasting machine. The high-speed air flow ejected from the air compressor which impinges on the surface of the product to take away the excess powder and make the surface smooth.

Dyeing: After sandblasting, dyeing equipment will be heated, disseminated and cooled. The dyeing temperature is about 120°C.

Drying: Place the construction in the oven and dry for 40 minutes.

8. Inspection
8. Inspection

8. Inspection

Initial checking: Clear powder, hole dredging

Quality checking: The quality inspector checks the size, quantity, and dyeing effect of the part according to the drawings.

9. Inspection, Packaging and Delivery

Finished product will be wrapped carefully for deliver to customer. We will cover the part with foam ball to ensure the part will not damage during transportation. We will pay extra attention to sensitive part.

9.	Inspection, Packaging and Delivery
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