Arrangement and method for producing a three-dimensional product

An arrangement for producing a three-dimensional product, the arrangement comprising:

• a work table on which said three-dimensional product is built up,
• a powder dispenser that distributes a thin layer of powder on the work table, thereby forming a powder bed,
• a radiation gun that fuses the powder together by delivering energy thereto,
• a beam guide that guides the beam emitted by the radiation gun over said powder bed such that the beam forms a cross section of said three-dimensional product by fusing together parts of said powder bed, and
• a control computer which
• stores information about successive cross sections of the three-dimensional product, which cross sections build up the three-dimensional product,
• controls the beam guide according to an operating scheme,
• stores information about a calculated amount of supplied energy required to maintain at least one part area within each powder layer at a defined working temperature;
• and
• sets the calculated amount of supplied energy as a maximum energy output of the radiation gun before the radiation gun delivers energy to said at least one part area.

A method for production of three-dimensional bodies by successive fusing together of selected areas of a powder bed, which parts correspond to successive cross sections of the three-dimensional body, the method comprising:

• applying a powder layer to the powder bed;
• fusing a selected area of the powder layer, where fusing includes supplying energy from a radiation gun, according to an operating scheme determined for the powder layer, to the selected area such that the powder in the selected area is fused into a cross section of said three-dimensional body;
• calculating an amount of supplied energy required to maintain the selected area at a defined working temperature during said supplying energy;
• and
• setting the calculated amount of supplied energy as a maximum energy output of the radiation gun during said supplying energy, where said setting is performed before said supplying energy.