CN109079143A - The method for removing precinct laser fusion formation of parts surface of internal cavity crackle - Google Patents

The method for removing precinct laser fusion formation of parts surface of internal cavity crackle Download PDF

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Publication number
CN109079143A
CN109079143A CN201710445500.XA CN201710445500A CN109079143A CN 109079143 A CN109079143 A CN 109079143A CN 201710445500 A CN201710445500 A CN 201710445500A CN 109079143 A CN109079143 A CN 109079143A
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China
Prior art keywords
parts
precinct laser
laser fusion
fusion formation
removal
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CN201710445500.XA
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Chinese (zh)
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CN109079143B (en
Inventor
侯慧鹏
张渝
雷力明
何艳丽
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中国航发商用航空发动机有限责任公司
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Priority to CN201710445500.XA priority Critical patent/CN109079143B/en
Priority claimed from CN201710445500.XA external-priority patent/CN109079143B/en
Publication of CN109079143A publication Critical patent/CN109079143A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10Sintering only
    • B22F3/105Sintering only by using electric current other than for infra-red radiant energy, laser radiation or plasma ; by ultrasonic bonding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10Sintering only
    • B22F3/105Sintering only by using electric current other than for infra-red radiant energy, laser radiation or plasma ; by ultrasonic bonding
    • B22F3/1055Selective sintering, i.e. stereolithography
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24After-treatment of workpieces or articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24After-treatment of workpieces or articles
    • B22F2003/247Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24After-treatment of workpieces or articles
    • B22F2003/248Thermal after-treatment

Abstract

The present invention relates to a kind of methods for removing precinct laser fusion formation of parts surface of internal cavity crackle comprising: hip treatment hip treatment step: is carried out to precinct laser fusion formation of parts;Abrasive Flow processing step: abrasive grain stream process is carried out to the precinct laser fusion formation of parts after hip treatment.The present invention removes the method for precinct laser fusion formation of parts surface of internal cavity crackle by the way that abrasive grain flow step is arranged after hot isostatic pressing step, precinct laser fusion formation of parts initial surface quality is preferable, inner cavity of component open-delta winding is eliminated using abrasive Flow technique, effectively promotes the comprehensive performance of part.

Description

The method for removing precinct laser fusion formation of parts surface of internal cavity crackle

Technical field

The present invention relates in material working process technical field more particularly to a kind of removal precinct laser fusion formation of parts The method of chamber face crack.

Background technique

Precinct laser fusion (Selective Laser Melting, abbreviation SLM) technology is a kind of typical increasing material manufacturing (Additive Manufacturing) technology is predicted to be one of the key technology that may cause " the third time industrial revolution ", Its main technical principle are as follows: part three-dimensional digital model to be processed is successively divided, be input to precinct laser fusion at In shape equipment.Substrate is fixed in forming platform first, and is leveled, carries out single berth using scraper plate or powder roller later Powder carries out selective melting using a branch of or multiple laser single layer powder good to laying, realize by put to line, by line to face at Shape process, later forming platform decline certain altitude, carry out next layer of powdering and selective melting forming, finally realize by face to The forming process of body, thus to obtain final part.Compared to traditional handicraft, selective laser melting process has stock utilization It is high, increase the degree of design freedom, shape the multiple advantages such as high-precision, surface quality be good, add particularly suitable for aerospace is contour It is worth industry.

However, rapid solidification is along with pole since precinct laser fusion forming process is along with rapid solidification High-temperature gradient, resulting in part, there are biggish residual stress, and when local residual stress is more than tensile strength, part occurs Crackle obtains stress by cracking and discharges to a certain extent.In general, crack distribution range not only includes inside parts, also include Piece surface.

Since there are crackles for precinct laser fusion formation of parts, it is difficult to meet wanting for structure durability and damage tolerance design It asks, this point is especially pronounced in aerospace field.For this problem, the elimination of following two method is generallyd use at present and is split Line: first is that making inside parts crack closure using heat and other static pressuring processes;Second is that using machining process (such as turning, milling) Processable face is machined.However the feature intrinsic due to heat and other static pressuring processes, it is only capable of making inside parts crack closure, Play the role of eliminating underbead crack, and there is no effect for cracks with surface openings.And machining process is used to there is processing The problems such as position limitation is high, to parts with complex structures complex process, especially precinct laser fusion formation of parts usually has Complicated inner-cavity structure, mechanical processing technique are often difficult to play a role.

It can be seen that by heat and other static pressuring processes and tradition machinery processing technology, can eliminate inside parts micro-crack and Open surface crackle, and the face crack of inner cavity is difficult to remove.It is molten that the presence of surface of internal cavity crackle can seriously destroy precinct laser The surface integrity for changing part, has a significant impact to the military service performance of components, life and reliability.Such as it is with titanium alloy member Example, statistics shows that the failure of 90% aero titanium alloy part is related to fatigue behaviour, and face crack often plays fatigue The effect of formation of crack improves the surface integrity of titanium alloy by certain techniques, has key effect for promoting fatigue behaviour.

Summary of the invention

To overcome the above technological deficiency, the technical problem to be solved by the present invention is to provide a kind of formings of removal precinct laser fusion The method of inner cavity of component face crack can effectively remove the face crack of precinct laser fusion formation of parts inner cavity.

In order to solve the above technical problems, the present invention provides a kind of removal precinct laser fusion formation of parts surface of internal cavity to split The method of line comprising:

Hip treatment step: hip treatment is carried out to precinct laser fusion formation of parts;

Abrasive Flow processing step: abrasive grain stream process is carried out to the precinct laser fusion formation of parts after hip treatment.

Further, further include cutting analytical procedure between hip treatment step and abrasive Flow processing step: right Part after completing hot isostatic pressing carries out cutting analysis, to obtain the maximum of the crack depth on inner cavity of component surface, according to splitting The maximum of line depth determines the material removal amount that abrasive Flow need to reach.

Further, if the maximum of crack depth is greater than the pattern allowance of precinct laser fusion formation of parts, increase mould Type surplus, and the minimum value of total pattern allowance is greater than the maximum of crack depth.

Further, the roughness that the maximum of crack depth passes through the surface of internal cavity different location after the completion of detection cutting It is obtained with crack distribution and by analysis on cracks.

Further, analysis on cracks includes: to carry out multiposition cutting to precinct laser fusion formation of parts, to precinct laser Formation of parts is melted to analyze using progress Metallographic Analysis after the cutting of vertical crack direction and multiple batches of repetition cutting.

Further, abrasive Flow processing step includes: to carry out abrasive Flow, carry out abrasive material removal and whether detect stock removal Reach desired value, if the stock removal measured and desired value are not met, resets the model of precinct laser fusion formation of parts Surplus.

Further, further include part sampling observation step: to extract carry out abrasive Flow treated the part of preset quantity into Row cutting analysis detection, judges whether there is crackle.

It further, further include the model preprocessing step, blank procedure of processing and heat treatment step successively carried out, heat Processing step is located at before hip treatment step.

As a result, based on the above-mentioned technical proposal, the present invention removes the side of precinct laser fusion formation of parts surface of internal cavity crackle Method after hot isostatic pressing step by being arranged abrasive grain flow step.Abrasive Flow is used for finishing, polishing, the deburring of part, has Favorable repeatability, the high feature of surface quality.Precinct laser fusion formation of parts initial surface quality is preferable, using abrasive Flow work Skill eliminates inner cavity of component open-delta winding, further increases surface roughness.The present invention is directed to can not lead to after hot isostatic pressing The inner cavity crackle that over mechanical processing or manual grinding are eliminated.

Detailed description of the invention

The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair Bright illustrative embodiments and their description for explaining only the invention, do not constitute improper limitations of the present invention.In the accompanying drawings:

Fig. 1 is the flow chart of the method for present invention removal precinct laser fusion formation of parts surface of internal cavity crackle;

Fig. 2 is cutting analytical procedure in the method for present invention removal precinct laser fusion formation of parts surface of internal cavity crackle Flow chart;

Fig. 3 is abrasive Flow processing step in the method for present invention removal precinct laser fusion formation of parts surface of internal cavity crackle Flow chart;

Fig. 4 (a) and Fig. 4 (b) is respectively that precinct laser fusion forming GH4169 alloy utilizes present invention removal precinct laser Underbead crack distribution map of the method for fusing forming inner cavity of component face crack under deposited and hot isostatic pressing state;

Fig. 5 (a) and Fig. 5 (b) is that precinct laser fusion shapes GH4169 alloy part using present invention removal precinct laser Surface cracks distribution map of the method for fusing forming inner cavity of component face crack after hot isostatic pressing.

Specific embodiment

Below by drawings and examples, technical scheme of the present invention will be described in further detail.

A specific embodiment of the invention be for the ease of to design of the invention, it is solved the technical issues of, constitute skill The technical characteristic and bring technical effect of art scheme have further description.It should be noted that for these embodiment party The explanation of formula does not constitute a limitation of the invention simultaneously.In addition, technology involved in the embodiment of present invention described below is special Sign can be combined with each other as long as they do not conflict with each other.

In one schematical embodiment of method of present invention removal precinct laser fusion formation of parts surface of internal cavity crackle In, as shown in Figure 1, this method comprises:

Hip treatment step 4: hip treatment is carried out to precinct laser fusion formation of parts;

Abrasive Flow processing step 6: abrasive Flow is carried out to the precinct laser fusion formation of parts after hip treatment Processing.

The processing step of usual precinct laser fusion formation of parts includes: that model treatment-blank forming-destressing is moved back Fire-remove support-hot isostatic pressing.In the schematical embodiment, the present invention unlike conventional processing routes, by Abrasive Flow processing step 6 is set after hip treatment step 4, and abrasive Flow is used for finishing, polishing, the deburring of part, has Favorable repeatability, the high feature of surface quality.Precinct laser fusion formation of parts initial surface quality is preferable, using abrasive Flow Technique eliminates inner cavity of component open-delta winding, further increases precinct laser fusion formation of parts surface of internal cavity roughness.This hair It is bright to be disappeared by the inner cavity crackle of machining or manual grinding elimination using abrasive Flow method for after hot isostatic pressing Except inner cavity of component face crack.

Specifically or preferably, as shown in Figure 1, the present invention removes precinct laser fusion formation of parts surface of internal cavity crackle Method further includes the cutting analytical procedure 5 between hip treatment step 4 and abrasive Flow processing step 6: to completing, heat etc. is quiet Part after pressure carries out cutting analysis, to obtain the maximum of the crack depth on inner cavity of component surface, according to the pole of crack depth Big value determines the material removal amount that abrasive Flow need to reach.The present invention is according to the maximum of the crack depth on inner cavity of component surface come really Determine the material removal amount that abrasive Flow need to reach, effectively eliminates inner cavity of component open-delta winding and realization uses as needed, avoid not Cost is saved in necessary waste.

Specifically or preferably illustrate present invention removal precinct laser fusion below with reference to process shown in FIG. 1 to FIG. 3 The method of formation of parts surface of internal cavity crackle is as follows:

(1) model preprocessing step 1, addition and supported design comprising pattern allowance, and threedimensional model is sliced, Obtain process modeling;

(2) blank procedure of processing 2, including by process modeling file import equipment, using optimization precinct laser fusion at Shape technological parameter carries out precinct laser fusion forming, part is collected and inner cavity powder is cleared up etc.;

(3) heat treatment step 3, at the same contain part complete stress relief annealing after, substrate is separated into required line with part Cutting action, and support removing step.

(4) hip treatment step 4 plays a part of to eliminate inside parts crackle.

(5) processing step 5 is analyzed in cutting, cutting analysis is carried out to the part after completion hot isostatic pressing, as shown in Fig. 2, tool Body includes the cutting scheme 5.1 of design elements, and cutting scheme should be can show complete inner-cavity structure as optimum state;Implement Cutting 5.2 carries out cutting using electric spark wire cutting machine or other technologies;Roughness measurement 5.3, after the completion of detection cutting Surface of internal cavity different location roughness, provide foundation for analysis on cracks and detection;Crack detection 5.4, utilizes fluorescent penetrant Detection, Metallographic Analysis or two kinds of techniques combine, and determine the distribution situation of face crack;Analysis on cracks 5.5, emphasis is for thick Rugosity is worth lesser region and intracavity section product sudden change region, using appropriate method (as further to precinct laser fusion Formation of parts carries out multiposition cutting, utilizes progress metallographic point after the cutting of vertical crack direction to precinct laser fusion formation of parts Analysis and multiple batches of repetition cutting analysis) crack depth is analyzed, the maximum of crack depth is obtained after comprehensive comparison.It should be noted that It is that when due to carrying out abrasive Flow, the former biggish surface stock removal of roughness can be greater than roughness smaller area, therefore in crackle depth When degree analysis, it should perform an analysis emphasis for the preferable region of apparent surface's mass.

According to determining crack depth maximum, if the maximum of crack depth is less than precinct laser fusion formation of parts Pattern allowance then carries out abrasive Flow;If maximum is greater than the pattern allowance of precinct laser fusion formation of parts, repeat step 1 model treatment increases corresponding surplus in crackle surface of internal cavity.It should be noted that the occurrence of inner cavity different location surplus, It is closely related with the design feature of inner cavity of component, but the pattern allowance minimum value after increase should be greater than analyzing resulting crack depth Maximum levels off to 100% to ensure that crackle removal reaches effect, promotes the comprehensive performance of part.

(6) abrasive Flow processing step 6, as shown in figure 3, specifically including process parameters design 6.1, not according to material category Same, abrasive type, abrasive grain, pressure, binder type that the different selections of intracavity section product are different etc.;Engineered abrasives cleaning side Case 6.2, it is significant to note that, after removing surface of internal cavity crackle using abrasive Flow, it is using appropriate technique cleaning abrasive material Key link;Abrasive Flow implements 6.3;Abrasive material removal 6.4;Whether analysis detection 6.5 reaches pre- using industry CT detection stock removal Time value need to repeat the setting of step 1 pattern allowance when the stock removal and desired value that analysis detection measures are not met.

(7) part inspects step 7 by random samples, refers mainly to realizing the volume production stage, extracts certain amount part, repeat according to step 5 It is detected, checks whether and achieved the purpose that remove surface of internal cavity crackle.

(8) final inspection and step 8 is checked and accepted, adoptable means include but is not limited to Metallographic Analysis, X-ray detection, glimmering Light detection etc..

The present invention is proposed and is eliminated using abrasive Flow technique on the basis of hip treatment eliminates inside parts crackle The method of part surface crack is finally reached the purpose for completely eliminating the crackle in part, with current prior art method phase Than having the advantage that

(1) improve part mechanical property;

Eliminate crackle process can to avoid inside parts and face crack to mechanical property (including stretch, persistently, fatigue Deng) destruction, to promoted part comprehensive performance play an important role.

(2) lot stability of part is improved;

The dispersibility that the presence of precinct laser fusion formation of parts crackle will lead to the batch performance data of part substantially mentions Height results in part service life and fluctuates in a big way, it is difficult to the service life of Accurate Prediction part.Eliminate crackle work Sequence can be such that part performance inconsistency reduces, and promote lot stability.

(3) roughness, dimensional accuracy are optimized;

Dimensional accuracy, the surface roughness of precinct laser fusion formation of parts are generally difficult to meet high-precision labyrinth zero The requirement of part.While eliminating crackle, by appropriate technology controlling and process, the coarse of surfaces externally and internally can be greatly improved Degree improves dimensional accuracy, meets product demand.

To sum up, by eliminate inner cavity of component face crack can effective Improving The Quality of Products, for promote constituency swash Engineering application of the light smelting technology in fields such as aerospaces has important practical significance.

Illustrated for removing precinct laser fusion forming GH4169 pipe component containing cross-section surface cracks below The method of the present invention is as follows:

(1) model preprocessing is carried out with cross-section internal duct part to some using UG NX7.5, part material is GH4169 alloy, tubing internal diameter φ 3.2mm, outer diameter φ 10.0mm have the rounding off and one that bending radius is R6.0mm at one Place R10.0mm causes pipeline direction to occur to change twice, pipeline total length about 100mm.First to the machinery determined outside part Machined surface adds 1mm or so surplus, and exports stl file, be supported design using Magics19.0 and export slice file. Slice file is imported into precinct laser fusion former, blank forming process is carried out.Setting forming parameters are layer It is 40 μm, laser power 200W, scanning speed 900mm/s thick, 100 μm of laser spot diameter, 110 μm of sweep span, complete blank Destressing heat treatment is carried out after forming, heat treating regime is 1170 ± 50 DEG C/1h, AC.It will using wire cutting after the completion of heat treatment Part is separated from substrate, and support is removed, shown in observation inside parts crack distribution situation such as Fig. 4 (a).

(2) hot isostatic pressing is carried out to the part for completing support removal using vacuum heat treatment furnace, eliminates internal split to reach The purpose of line, selection heat and other static pressuring processes are 1170 DEG C/2h, pressure 150MPa, cooling velocity 3K/min.By analysis, interior Crack effect is eliminated close to 100%, as shown in Fig. 4 (b) in portion.Such as eliminate crack effect it is undesirable when, hot isostatic pressing work need to be adjusted Skill repeats above step.

(3) cutting is carried out to part using Wire EDM or other method for slitting.

(4) determining crack depth maximum is combined with Metallographic Analysis using fluorescent penetrant detection.

Liquid penetrant testing cleans the part after cutting using halogenated hydrocarbon solvent, sufficiently removes grease existing for piece surface And other may influence the substance of Liquid penetrant testing effect, guarantee that part cleans drying.It is being carried out using black light lamp to effect is applied Under the premise of monitoring, bleeding agent is applied using the method for manual brushing, keeps bleeding agent time of contact 15min~30min.Using Emulsifier is coated, and carry out most after washing the removal a large amount of bleeding agent of piece surface in advance with the consistent water temperature of environment temperature Cleaning eventually applies imaging agent.It is finally checked under black light lamp, obtains the distribution situation of part surface crack.It is equal that there are crackles Position should carry out further Metallographic Analysis.

Metallographic Analysis, crack position of the selection by fluorescent penetrant inspection discovery, and selection certain amount are representative Surface region or viewing area crackle distribution situation.As shown in figure 5,2~5 μ of the viewing area surface cracks width m.In this example, it can determine about 30 μm of crack depth maximum by whole cross section observation observation, certain surplus considered, by crackle The positioning of depth maximum.

Test cutting plane hardness number is HRB94.

(5) repeat step 1 model preprocessing, after tubing internal diameter is adjusted to φ 3.1mm, repeat step 2~step 4.

(6) abrasive Flow process flow is carried out.150 mesh silicon carbide abrasives are selected, pressure 10MPa is set.Abrasive Flow continuously into After the row 30min time, using the variation of industry CT signal piping diameter, it is determined whether need to continue abrasive Flow.Work as pipeline After diameter reaches preset value φ 3.2mm, process stops.

Under 12MPa pressure, after carrying out cleaning 20min using aviation kerosine, original clean aviation kerosine is replaced Rinse 5min, collect whole oil outlets, kerosene clean level at visual comparison's oil outlet and oil inlet, until both close to one It causes.Later, vacuum drying is carried out, and 3min is blown from inlet using compressed air, while manually being tapped, such as finds pipeline Exit has particle to be blown out, then continues to repeat Filter Tuber For Clean Coal oil flushing-drying-blowing compressed air, until there is no particles Object generates.

(7) fluorescent penetration test, Metallographic Analysis are detected whether there are still face crack after progress X-ray procedure, cutting, As produced in batches there is no after curing process if crackle.But batch sampling observation should be executed.

(8) part final inspection and storage are completed.

The embodiment combined above is described in detail embodiments of the present invention, but the present invention is not limited to be retouched The embodiment stated.For a person skilled in the art, in the case where not departing from the principle and substance of the present invention spirit A variety of variations, modification, equivalence replacement and modification is carried out to these embodiments to still fall within protection scope of the present invention.

Claims (8)

1. a kind of method for removing precinct laser fusion formation of parts surface of internal cavity crackle characterized by comprising
Hip treatment step: hip treatment is carried out to precinct laser fusion formation of parts;
Abrasive Flow processing step: abrasive grain stream process is carried out to the precinct laser fusion formation of parts after hip treatment.
2. the method for removal precinct laser fusion formation of parts surface of internal cavity crackle according to claim 1, feature exist In further including the cutting analytical procedure between the hip treatment step and the abrasive Flow processing step: to completing heat Part after equal static pressure carries out cutting analysis, to obtain the maximum of the crack depth on inner cavity of component surface, according to the crackle The maximum of depth determines the material removal amount that abrasive Flow need to reach.
3. the method for removal precinct laser fusion formation of parts surface of internal cavity crackle according to claim 2, feature exist In if the maximum of the crack depth increases the model greater than the pattern allowance of the precinct laser fusion formation of parts Surplus, and the minimum value of total pattern allowance is greater than the maximum of the crack depth.
4. the method for removal precinct laser fusion formation of parts surface of internal cavity crackle according to claim 2, feature exist In the roughness and crack distribution that the maximum of the crack depth passes through the surface of internal cavity different location after the completion of detection cutting And it is obtained by analysis on cracks.
5. the method for removal precinct laser fusion formation of parts surface of internal cavity crackle according to claim 4, feature exist In the analysis on cracks includes: to carry out multiposition cutting to the precinct laser fusion formation of parts, molten to the precinct laser Change formation of parts to analyze using progress Metallographic Analysis after the cutting of vertical crack direction and multiple batches of repetition cutting.
6. the method for removal precinct laser fusion formation of parts surface of internal cavity crackle according to claim 1, feature exist In the abrasive Flow processing step includes: to carry out abrasive Flow, carry out abrasive material removal and detect whether stock removal reaches expected Value resets the pattern allowance of the precinct laser fusion formation of parts if the stock removal measured and desired value are not met.
7. the method for described in any item removal precinct laser fusion formation of parts surface of internal cavity crackles according to claim 1~6, It is characterized in that, further including part sampling observation step: carrying out cutting to carry out abrasive Flow treated the part for extracting preset quantity Analysis detection judges whether there is crackle.
8. the method for described in any item removal precinct laser fusion formation of parts surface of internal cavity crackles according to claim 1~6, It is characterized in that, further including the model preprocessing step, blank procedure of processing and heat treatment step successively carried out, at the heat Reason step is located at before the hip treatment step.
CN201710445500.XA 2017-06-13 Method for removing cracks on inner cavity surface of selective laser melting formed part CN109079143B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710445500.XA CN109079143B (en) 2017-06-13 Method for removing cracks on inner cavity surface of selective laser melting formed part

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Application Number Priority Date Filing Date Title
CN201710445500.XA CN109079143B (en) 2017-06-13 Method for removing cracks on inner cavity surface of selective laser melting formed part
PCT/CN2018/090088 WO2018228251A1 (en) 2017-06-13 2018-06-06 Method for removing cracks on inner cavity surface of part formed by selective laser melting

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CN109079143A true CN109079143A (en) 2018-12-25
CN109079143B CN109079143B (en) 2020-12-29

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