Sintering: additive manufacturing process for rapid prototyping
Our 3D printing by Powder Sintering / Selective Laser Sintering
Prototype manufacturing process
For the production of prototypesby powder sinteringor laser sintering, polyamide (PA) particles are agglomerated thanks to the heat and the presence of a laser. In fact, the prototype manufacturing chamber is raised in temperature, a CO2 laser then sintered the polyamide arranged in a thin layer. The laser allows the powder to pass into a particular state which allows sintering. The layers follow one another to form the prototype.
The3D model is produced in successive layers of 0.10 mm.
The material can be produced in Polyamide (PA 12), Polyamide filled with glass fiber (PA GF) and now, for a short time, in Polypropylene (PP).
We carry out and validate the assembly of your sub-assemblies
The advantages of powder sintering
Allows for complex shapes
Mechanical resistance allowing validation of clips
Powder Sintering how does it work?
To be able to obtain a part via the powder sintering technology, several steps are necessary:
First of all it is essential to have a 3D file thanks to 3D design software in .STEP or .STL format
This file is then processed and cut by us into thin 0.10 mm slices.
This information is transmitted to the production machine. This sintering machine is composed of a pilot computer, 2 powder tanks, a platform, a lens and a laser. The construction of the part begins with the platform in the high position, flush with the construction surface of the machine.
A thickness of powder is deposited on the platform using a roller or an arm depending on the machine used.
Once the machine is closed, it heats up to reach a certain temperature in the construction cabin.
Once this temperature is reached, the laser starts up, passes through the lens and heads according to the trajectory calculated by the pilot computer to trace the contours of the part.
On contact with the laser, the powder becomes compact and welded because the heat is increased at this precise location to reach the melting point and sinter the material.
The platform drops 0.10 mm, then a new layer of powder is deposited on top.
The different stages then follow one another: the laser taps on the powder to harden it, the platform descends, the roller or the arm deposits a uniform layer of powder, etc.
Once all the successive layers have been produced, the temperature in the passenger compartment drops, the entire production can be accessed.
The manufacturing “cake” then looks like a powder cube.
It is then placed on a sieve and cooled so that its core is not too hot in order to avoid any risk of deformation of the parts.
Like archaeological excavations, using brushes and tools we come to find the prototypes produced in the middle of the powder.
The parts are then powdered, sanded, … to remove all the excess powder still present.