阅读说明：本技术 基于粉末床增材制造工件的方法、为该前述方法建立校正参数的方法和用于该后述方法的计算机程序产品 (Method for additive manufacturing of a workpiece based on a powder bed, method for establishing correction parameters for the aforementioned method and computer program product for the latter method ) 是由 D.卡斯琴 D.雷兹尼克 于 2017-04-13 设计创作，主要内容包括：本发明涉及一种在粉末床(13)中以增材制造设备(11)制造工件(19)的方法。其中,已经制造的构件的在能量束(17)下方可用的构件体积较少的构件区域中出现产生的熔池危险的过热。为了避免所述情况按照本发明建议,在考虑位于待制造的层(25)下方的构件(19)的情况下考虑轮廓函数(gcf)。由此推导出校正参数(vf),其遏制能量束(17)的引入能量数量以防止熔池的过热。本发明还涉及一种用于建立轮廓函数(gcf)的方法或者说用于建立校正函数(vf)的校正参数的方法和用于执行上述方法的计算机程序产品(26、27)。(The invention relates to a method of manufacturing a workpiece (19) in a powder bed (13) with an additive manufacturing apparatus (11). In this case, dangerous overheating of the melt pool which occurs in component regions of the already produced component which have a low component volume available below the energy beam (17). In order to avoid this, it is proposed according to the invention that the contour function (gcf) is taken into account while taking into account components (19) located below the layer (25) to be produced. From this, a correction parameter (vf) is derived which suppresses the amount of energy introduced by the energy beam (17) in order to prevent overheating of the bath. The invention also relates to a method for creating a contour function (gcf) or a correction parameter for creating a correction function (vf) and to a computer program product (26, 27) for carrying out the method.)

1. a method for additive manufacturing of a workpiece (19) on the basis of a powder bed, wherein the workpiece (19) is manufactured layer by layer in the powder bed (13), wherein for manufacturing the workpiece an uppermost layer (25) of the powder bed (13) is respectively solidified by means of an energy beam, characterized in that a geometry of the manufactured workpiece lying below the uppermost layer (25) is taken into account when solidifying the uppermost layer (25) of the powder bed (13), wherein the time-averaged power introduced by the energy beam (17) per unit area of the powder bed is reduced by using correction parameters when the heat discharge into the already manufactured workpiece (19) is reduced as a function of the workpiece depth (z) available under the energy beam.

2. a method according to claim 1, characterized in that the time-averaged power introduced per unit area of the powder bed is reduced by using the following correction parameters:

Reducing the power of the energy beam (17), and/or

Increasing the feed rate of the energy beam (17) on the powder bed (13), and/or

-maintaining an irradiation pause between a run of irradiation vectors (36) and a run of adjacent irradiation vectors (36), wherein the irradiation vectors respectively define sections of a path that the energy beam (17) traverses for solidifying the powder bed.

3. Method according to one of the preceding claims, characterized in that the workpiece depth (z) available under the energy beam is calculated from a data set describing the geometry of the workpiece (19).

4. Method according to one of the preceding claims, characterized in that the workpiece depth (z) available under the energy beam takes into account at most only the determined maximum depth (zm).

5. Method according to claim 4, characterized in that the maximum depth (zm) to be considered is determined to be at least 0.5mm and at most 2mm, preferably 1 mm.

6. Method according to claim 4, characterized in that the maximum depth (zm) to be considered is determined as a minimum of 10 layers and a maximum of 40 layers, preferably 20 layers.

7. Method according to one of the preceding claims, characterized in that the workpiece depth (z) available for the uppermost layer (25) respectively under the energy beam is described as a position-dependent profile function (gcf) for the surface component of the uppermost layer (25) to be solidified.

8. method according to claim 7 when dependent on claim 4, 5 or 6, characterized in that the contour function (gcf) is normalized to 1, wherein the value 1 is reached when the maximum depth (zm) to be considered is reached.

9. Method according to claim 7 or 8, characterized in that a correction function (vf) is associated with the contour function (gcf), in which correction function correction parameters for the time-averaged power introduced by the energy beam (17) per unit area of the powder bed are stored in a position-dependent manner.

10. Method according to claim 9, characterized in that the correction parameters of the associated correction function (vf) are determined on the basis of the average value of the correction function (vf) or the minimum value of the correction function (vf) along an illumination vector, wherein the illumination vector is a line element of the energy beam feed.

11. Method according to one of the preceding claims, characterized in that the distance from the contour edge is additionally taken into account when determining the correction parameters in the boundary region (33) of the contour.

12. A method for establishing a contour function (gcf) which is used for the method according to one of claims 7 to 11, characterized in that for a layer (25) to be processed of a powder bed, the workpiece depth (z) respectively available under the energy beam (17) for manufacturing is calculated as a position-dependent contour function (gcf) for the surface quantity to be solidified of the layer (25).

13. A method for establishing correction parameters for a correction function (vf) to be used in a method according to one of claims 9 to 11,

determining the amount of reduction of the time-averaged power introduced by the energy beam (17) per unit area of the powder bed by the production of the test specimen (28),

Deriving a correction parameter from said quantity, and

Storing the correction parameters together with the boundary conditions for manufacturing applicable for correction.

14. A method for establishing correction parameters for a correction function (vf) to be used in a method according to one of claims 9 to 11,

calculating the amount of reduction of the time-averaged power introduced by the energy beam (17) per unit area of the powder bed by means of a simulation program,

Deriving a correction parameter from said quantity, and

Storing the correction parameters together with the boundary conditions for manufacturing applicable for correction.

15. A computer program product for establishing a contour function (gcf) to be used in a method according to one of the claims 7 to 11,

Setting a build-up program module (CON) by means of which a workpiece depth (z) which is available for the layer (25) to be machined of the powder bed under the energy beam (17) used for the production in each case can be calculated as a position-dependent profile function (gcf) for the surface component of the layer (25) to be solidified,

-the setup program module (CON) has a first interface (S1) for inputting a data set describing the geometry of a workpiece (19) to be manufactured,

-the setup program module (CON) has a second interface (S4) for outputting the contour function (gcf).

16. A computer program product for establishing correction parameters for a correction function (vf) used in a method according to one of claims 9 to 11,

-providing a simulation program module (SIM) by means of which the amount of reduction of the time-averaged power introduced by the energy beam (17) per unit area of the powder bed can be calculated,

The simulation program module (SIM) has a third interface (S3) for inputting a data set describing the geometry of the workpiece (19) to be simulated and

the simulation program module (SIM) has a fourth interface (S4) for outputting the quantity.