CN111829844A - A kind of sampling method of metal fuse additive manufacturing sample - Google Patents

Abstract

The invention belongs to the technical field of 3D printing, and specifically discloses a sampling method for metal fuse additive manufacturing samples, comprising the following steps: S1: prepare a substrate, the material of which is the same as that of the test piece; S2: The test piece is printed on the substrate, and the test piece is grown vertically; S3: the substrate is removed from the test piece; S4: roughness processing is performed on the surface of the test piece; S5: flaw detection is performed on the test piece; S6: the The sample is subjected to sampling distribution planning, the sample is cut according to the sampling distribution plan, and several required sample blocks are cut; S7: All sample blocks are placed on the substrate, and all sample blocks are laid out , to test the performance of the sample block after layout. The above method can solve the problem that there is no effective detection method and relevant standards in the prior art, so it is difficult to determine the performance of the printed parts.

Description

A kind of sampling method of metal fuse additive manufacturing sample

technical field

The invention belongs to the technical field of 3D printing, and in particular relates to a sampling method for metal fuse additive manufacturing samples.

Background technique

As a disruptive technology, metal additive manufacturing (3D printing) has a profound impact on the traditional process flow, production line, factory model, and industrial chain combination. The most prominent advantage of metal 3D printing is that it can be formed without a mold, and objects of any shape can be printed directly from the designed 3D graphics data.

As a new technology, fused filament additive manufacturing currently has no effective detection methods and related standards, so it is difficult to determine the performance of printed parts. There is an urgent need for a comprehensive performance testing method for metal fuse additively manufactured specimens.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a sampling method for metal fuse additive manufacturing samples, so as to solve the problem that there is no effective detection method and relevant standards in the prior art, so it is difficult to determine the performance of the printed parts.

In order to achieve the above purpose, the technical scheme of the present invention is: a sampling method for metal fuse additive manufacturing samples, comprising the following steps:

S1: prepare a substrate, the material of the substrate is the same as the material of the test piece;

S2: print a test piece on the substrate, and the test piece grows vertically;

S3: remove the substrate from the test piece;

S4: Roughness processing is performed on the surface of the specimen;

S5: Detect flaws on the test piece;

S6: Plan the sampling distribution of the test piece, cut the test piece according to the sampling distribution plan, and cut out a number of required sample blocks; including the bending sample blocks for measuring the bending performance, which are cut on the front and rear sides of the test piece , Horizontal and vertical tensile specimen blocks for measuring tensile properties, impact specimen blocks for measuring impact properties and hardness for measuring specimens horizontally and vertically , the composition sample block of chemical composition;

S7: Place all the sample blocks on the substrate, and arrange all the sample blocks, and perform various performance tests on the sample blocks after the layout.

Further, in step S2, the perpendicularity between the test piece and the substrate is greater than or equal to 2 mm.

Further, in step S2, the deformation amount of the printed test piece is measured, if the deformation amount meets the requirements, then step S3 is performed; if it does not meet the requirements, the test piece is reprinted.

Further, in step S3, it is also necessary to perform edge trimming processing on the test piece.

Further, in step S4, the surface roughness Ra of the test piece is less than or equal to 6.3um.

Further, in step S4, a processing method is adopted: firstly, the test piece is subjected to turning treatment, and then the test piece is subjected to grinding treatment until the required roughness is processed.

Further, in step S5, the adopted flaw detection method is radiographic flaw detection.

Further, in step S6, two sample blocks are taken from the front and rear sides of the test piece, three each of the horizontal tensile sample block and the vertical tensile sample block, and the impact sample block. Three pieces, two component sample pieces.

Further, in step S6, the two sides of the horizontal tensile sample block and the vertical tensile sample block are wider than the middle part; the middle part of the bottom of the impact sample block is provided with a groove.

Further, in step S7, the four bending sample blocks and the other several sample blocks are respectively located on both sides of the substrate, and the four bending sample blocks are arranged side by side and the length direction of the bending sample blocks is the same as the length direction of the substrate. ; The vertical tensile sample block is arranged side by side on one side of the substrate, and the length direction of the vertical tensile sample block is perpendicular to the length direction of the substrate; the impact sample block and the horizontal tensile sample block are side by side The length direction of the impact sample block and the horizontal tensile sample block is consistent with the length direction of the substrate; the component sample blocks are arranged side by side and are located on the side of the impact sample block away from the vertical tensile sample block.

The beneficial effects of the technical solution are as follows: (1) Different parts are used for detection on a test piece, which improves the utilization rate of the test piece. ② Take multiple sample blocks for the same detection function to make the detection results more accurate. ③The substrate is made of the same material as that of the test piece, which can ensure the performance testing requirements of the test piece. ④ Trimming the test piece to ensure that the surface of the test piece is free of defects. ⑤ Carry out flaw detection on the test piece to determine whether there are defects such as cracks, pores and impurities inside it. If the test results do not meet the requirements, the test piece needs to be redone. ⑥Use different printing methods to print the test pieces, including arc, electron beam, plasma, laser, composite fuse additive manufacturing, sample and test multiple test pieces respectively, and compare the different additive manufacturing test pieces. The difference in performance provides a theoretical basis for printing parts with complex structures. ⑦ Layout the sample block to ensure the accuracy of the sample block detection.

Description of drawings

Fig. 1 is the flow chart of the sampling method of a kind of metal fuse additive manufacturing sample of the present invention;

Figure 2 is a front view of the substrate and the test piece;

Figure 3 is a side view of the substrate and the test piece;

Figure 4 is a schematic diagram of the specimen without edge removal and without substrate removal;

Fig. 5 is the layout schematic diagram of the sample block;

6 is a schematic diagram of a vertical tensile sample block and a horizontal tensile sample block;

Figure 7 is a schematic diagram of an impact sample block.

Detailed ways

The following is further described in detail by specific embodiments:

The reference signs in the accompanying drawings include: test piece 1, base plate 2, sample block 3 bent from the front side of the test piece, 4 curved test piece on the back side of the test piece, vertical tensile sample block 5, horizontal tensile test piece Sample block 6, impact sample block 7, component sample block 8.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The embodiment is basically shown in the accompanying drawings 1-7: a sampling method for metal fuse additive manufacturing samples, comprising the following steps:

S1: Prepare five groups of substrates 2 and five groups of additive manufacturing (respectively arc, electron beam, plasma, laser, composite fuse additive manufacturing), and the material of each group of substrates 2 is the same as the material of the corresponding test piece 1;

S2: Print the test piece 1 on the substrate 2, the test piece 1 grows vertically, and the perpendicularity between the test piece 1 and the corresponding substrate 2 is greater than or equal to 2 mm; measure the deformation of the printed test piece 1, if the deformation If it meets the requirements, go to step S3; if it does not meet the requirements, reprint the test piece 1.

S3: Remove the substrate 2 from the sample 1 by wire cutting; since the edge of the sample 1 will produce obvious metal melting marks during the printing process, it is necessary to trim the edge of the sample 1 before extracting the sample Treatment to ensure that the surface of the sample is free of defects;

S4: Roughness processing is performed on the surface of test piece 1, and the processing method is as follows: first, the test piece 1 is turned, and then the test piece 1 is ground, until the surface roughness of the test piece 1 Ra≤6.3um;

S5: Perform radiographic inspection on test piece 1 to determine whether there are defects such as cracks, pores and impurities in it. If the inspection results do not meet the requirements, test piece 1 needs to be redone;

S6: carry out sampling distribution planning for each group of test pieces 1, cut each group of test pieces 1 according to the sampling distribution plan, and cut out 15 required sample blocks; Bending specimens for measuring bending properties (two specimens 3 from the front side of the specimen and two specimens 4 for the rear side of the specimen), and specimens 1 are cut in the horizontal and vertical directions for measuring tensile strength. Horizontal tensile sample block 6 and vertical tensile sample block 5 (three each for horizontal tensile sample block 6 and vertical tensile sample block 5), impact sample for measuring impact performance Block 7 and composition test block 8 for measuring hardness and chemical composition (three impact test blocks and two composition test blocks 8); horizontal tensile test block 6 and vertical tensile test block 5 The two sides of the impact sample block 7 are wider than the middle part; the middle part of the bottom of the impact sample block 7 is provided with a groove;

S7: Place all the sample blocks on the substrate 2, and lay out all the sample blocks, and test the performance of the sample blocks after the layout; the layout method is: four bending sample blocks and other Several sample blocks are respectively located on both sides of the base plate 2, four bending sample blocks are arranged side by side and the length direction of the bending sample blocks is the same as the length direction of the base plate 2; the vertical tensile sample blocks 5 are arranged side by side on the base plate 2. 2, and the length direction of the vertical tensile sample block 5 is perpendicular to the length direction of the substrate 2; the impact sample block 7 and the horizontal tensile sample block 6 are arranged side by side, and the impact sample block 7 and the horizontal tensile sample block 6 are arranged side by side. The length direction of the sample block 6 is consistent with the length direction of the substrate 2 ; the component sample blocks 8 are arranged side by side and are located on the side of the impact sample block 7 away from the vertical tensile sample block 5 .

It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus.

The above are only the embodiments of the present invention, and the common knowledge such as the well-known specific structures and characteristics in the scheme has not been described too much here. Those of ordinary skill in the art know that the invention belongs to the technical field before the filing date or the priority date. Technical knowledge, can know all the prior art in this field, and have the ability to apply conventional experimental means before the date, those of ordinary skill in the art can improve and implement this scheme in combination with their own ability under the enlightenment given in this application, Some typical well-known structures or well-known methods should not be an obstacle to those skilled in the art from practicing the present application. It should be pointed out that for those skilled in the art, some modifications and improvements can be made without departing from the structure of the present invention. These should also be regarded as the protection scope of the present invention, and these will not affect the implementation of the present invention. Effectiveness and utility of patents. The scope of protection claimed in this application shall be based on the content of the claims, and the descriptions of the specific implementation manners in the description can be used to interpret the content of the claims.

Claims (10)

1. a sampling method of metal fuse additive manufacturing sample is characterized in that: comprise the following steps: S1: prepare a substrate, the material of the substrate is the same as the material of the test piece; S2: print a test piece on the substrate, and the test piece grows vertically; S3: remove the substrate from the test piece; S4: Roughness processing is performed on the surface of the specimen; S5: Detect flaws on the test piece; S6: Plan the sampling distribution of the test piece, cut the test piece according to the sampling distribution plan, and cut out a number of required sample blocks; including the bending sample blocks for measuring the bending performance, which are cut on the front and rear sides of the test piece , Horizontal and vertical tensile specimen blocks for measuring tensile properties, impact specimen blocks for measuring impact properties and hardness for measuring specimens horizontally and vertically , the composition sample block of chemical composition; S7: Place all the sample blocks on the substrate, and arrange all the sample blocks, and perform various performance tests on the sample blocks after the layout. 2 . The method for sampling a metal fuse additive manufacturing sample according to claim 1 , wherein in step S2 , the perpendicularity between the sample and the substrate is greater than or equal to 2 mm. 3 . 3. The sampling method of a metal fuse additive manufacturing sample according to claim 1, characterized in that: in step S2, the measurement of the deformation amount is carried out to the printed test piece, if the deformation amount meets the requirements, Then go to step S3; if it does not meet the requirements, reprint the test piece. 4 . The method for sampling a metal fuse additive manufacturing sample according to claim 1 , wherein in step S3 , it is also necessary to perform edge trimming on the sample. 5 . 5 . The method for sampling a metal fuse additive manufacturing sample according to claim 1 , wherein in step S4 , the surface roughness Ra of the sample is less than or equal to 6.3um. 6 . 6. The sampling method of a metal fuse additive manufacturing sample according to any one of claims 1 and 5, characterized in that: in step S4, the processing method adopted is: first, the test piece is subjected to turning processing , and then grind the test piece until the required roughness is reached. 7 . The method for sampling a metal fuse additive manufacturing sample according to claim 1 , wherein: different printing methods are used to print the sample, and multiple samples are sampled and detected respectively. 8 . 8. The method for sampling a metal fuse additive manufacturing sample according to claim 1, wherein in step S6, two sample blocks are taken from the front and rear sides of the test piece, so The horizontal tensile sample block and the vertical tensile sample block are three each, the impact sample block is three, and the component sample block is two. 9. The method for sampling a metal fuse additive manufacturing sample according to any one of claims 1 or 8, characterized in that: in step S6, the horizontal tensile sample block and the vertical tensile The two sides of the sample block are wider than the middle part; the middle part of the bottom of the impact sample block is provided with a groove. 10. A method for sampling metal fuse additive manufacturing samples according to any one of claims 8, characterized in that: in step S7, four bending sample blocks and several other sample blocks are respectively located at On both sides of the substrate, four bending sample blocks are arranged side by side, and the length direction of the bending sample blocks is the same as the length direction of the substrate; the vertical tensile sample blocks are arranged side by side on one side of the substrate, and are vertically pulled. The length direction of the tensile sample block is perpendicular to the length direction of the substrate; the impact sample block and the horizontal tensile sample block are arranged side by side, and the length direction of the impact sample block and the horizontal tensile sample block is consistent with the length direction of the substrate ; The component sample blocks are arranged side by side and are located on the side of the impact sample block away from the vertical tensile sample block.

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