ASME Y14.46-2017 pdf – Product Definition for Additive Manufacturing.
5,1 General
Section 5 establishes data requirements for manufacturing a part with an AM process. Due to the inherently digital nature of AM processes, this section focuses on model-based requiremeilts (see ASM F Y14.100— Classification Codes 3,4, and 5), as opposed to drawing-centric requirements.
5.2 Product Data Package Types
Paragraph 5.2 establishes data requirements for managing different stages of an AM part. The process intricacies required to define the transition from a product definition data set to a part is like that of forgings and castmgs in both complexity and postprocessing requirements. As such, managing the AM transition shall be similar to managing transitions established in the applicable standards for casting and forgings. Each transition may be represented as a unique file set with unique formats. These files shall be collected into a PDP type.
Table 5.1 presents examples olconstituent PDP types used in AM. At a minimum, one PDP type is required; AM design is described In Tables 5-1 and 5-2.
5.3 PDP Type Contents
5.3.1 AM Design Data Package (DP). The AM Design DP content may include the required and optional elements identified in lable 5.L
5.3.2 AM 84J1Ld DP. The AM Build 1W content may include the required and optional elements identified in Table 5-3.
5.3.3 AM Processed DP. The AM Processed DP content may include the required and optional elements Identified in Table 5-4.
This Appendix Is an informative appendix.
The transition property is indicated with symbol m.The transition function is indicated asf1. At any given locationx.y. z within a unit•delined volume of the transition region, the required factor m1 is computed using eq. (1). The unit-defined volume Is thevolume within which the property iscumputv’d. Any given location can be normalized by usingall factors rn and summing to 1; see eq. (2). Furthermore, tolerance on the value of the factor may be specified as ,,,, and may be computed using formula (3). All computed values may he taken as absolute positive values as deemed necessary. Mathematical functions defined in ISO/ASTM 52915 are also applicable.
The application of this method is illustrated in para. 4.3.2.
Table B-I provides an example of material gradient values for the part shown in Figure 4-12. This example implements functions to specify a gradient, which are!2 . z – 10 andf1 15 – (z – 10). These equations may be represented in the part or any derivative modeL The tolerance on MAT1 and MAT2 is identified in Table LI-i as ±125% and ±25%. respectively, The actual valueof the material composition in a minimal measurable volume in the part space will equal 100% (Including voids). Nominal material compositions are modified by changing the equations computed In the table. The tolerance values are unilaterally disposed within the VOL bounded region at the material boundaries (e.g.,: = 10,: = 25 or when nominals are either 0% or 100%).
Figure B-I describes the nominal values of materials along the a-axis with their tolerance zones and a set of allowable values for MATI und MAT2. The two lines with small dashes indicate the tolerance zone for each material. For a chosen allowable value of MAT2 (blue circle at a given z-coordinate). a corresponding maximum allowable value of MAT1 Is shown in the graph. Although MAT2 values are at their upper/lower allowable limits. MAT1 values do not lie at the upper or lower allowable limits This is due to different tolerance zones for each material fraction.
Figure B-I indicates that nominal limits and acceptable material fractions along the i-axis for VOL2 are based on the equations embedded in the part model
This example also allows for a void fraction. As depicted in Figure B-2, any value of MATI in the black area is acceptable, based on the given values ol MAT2. When MATI fractions are below the top line connecting the black triangles, the material fractions at MAT1 and MAT2 do not add up to 1. In this case, the remainder of the material fraction is allowable void fractions. Simibrly, if MATL fractions were given as depicted in Figure B3 with black triangles, the respective maximumallowable fractionsfor MAT2 are shown with blue circles. All acceptable MAT2 fractions areshown as blue area, When MAT2 fractions are below the top line connecting the blue circles, the material fractions olMi and M2 do not add up to 1. In this case, the remainder of the material traction is allowable void fractions.