CN106863784A - A kind of forming quality monitoring method and increasing material manufacturing equipment - Google Patents

A kind of forming quality monitoring method and increasing material manufacturing equipment Download PDF

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Publication number
CN106863784A
CN106863784A CN201710044379.XA CN201710044379A CN106863784A CN 106863784 A CN106863784 A CN 106863784A CN 201710044379 A CN201710044379 A CN 201710044379A CN 106863784 A CN106863784 A CN 106863784A
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CN
China
Prior art keywords
shaping
layer
scanning
material manufacturing
increasing material
Prior art date
Application number
CN201710044379.XA
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Chinese (zh)
Inventor
杨东辉
李洋
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西安铂力特激光成形技术有限公司
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Priority to CN201710044379.XA priority Critical patent/CN106863784A/en
Publication of CN106863784A publication Critical patent/CN106863784A/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B33ADDITIVE MANUFACTURING TECHNOLOGY
    • B33YADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y50/00Data acquisition or data processing for additive manufacturing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B33ADDITIVE MANUFACTURING TECHNOLOGY
    • B33YADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y50/00Data acquisition or data processing for additive manufacturing
    • B33Y50/02Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T15/003D [Three Dimensional] image rendering
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/18Closed circuit television systems, i.e. systems in which the signal is not broadcast

Abstract

The invention discloses a kind of forming quality monitoring method, after shaping scanning work starts, scanning shaped one layer after, start to lay next layer of formed powder before, by the photo that forming platform region is shot by being arranged on the video camera above forming platform, corresponding slicing layer in the photo internal shaping CNC Model of the part current layer information with formation of parts is contrasted, calculate matching degree, if matching degree is in the range of error permission, continue executing with scanning shaping work, if it is not, increasing material manufacturing equipment is stopped.Also disclose the increasing material manufacturing equipment used by the method.Monitoring method of the invention and equipment can carry out monitor in real time to forming quality, understand forming quality situation at any time so as to operating personnel, pinpoint the problems in time, slacken or even eliminate because cannot real-time monitoring shaping process and the quality of shaping, the problems such as the forming quality that causes is poor, part shaping fails.

Description

A kind of forming quality monitoring method and increasing material manufacturing equipment

Technical field

The invention belongs to increases material manufacturing technology field, and in particular to a kind of forming quality monitoring method, a kind of prison is further related to Control the increasing material manufacturing equipment of forming quality.

Background technology

Increases material manufacturing technology is based on three-dimensional CAD model data, by way of increasing material and successively manufacturing, with computer Three Dimensional Design Model is source, by software hierarchy and numerical control formation system, is successively piled up material using high energy beam, most Whole superposition forming, produces a kind of technological means of geometry in particular part.Increasing material manufacturing equipment in forming process, shadow The factor for ringing its quality has a lot, for example, circulates that wind path is unstable, forming parameter is imperfect, Z axis low precision etc., can influence The quality of shaping, when situation is serious, or even the failure that the scanning shaping of whole part can be caused.It is possible to real-time monitoring shapes During the shaping situation of part be just particularly important.

It is existing scanning forming technique in, increasing material manufacturing equipment cannot real-time monitoring shaping process and forming quality, Equipment is caused during shaping is scanned, because the scratch of part deforms, what unstable, scarce powder of circulation wind path etc. was caused is scanned into Subregion powder is few and duplicate the situation of scanning during shape.When above-mentioned situation cannot timely be found and be processed When, it is possible to there is the situation of the scanning forming quality of influence formation of parts.

The content of the invention

It is an object of the invention to provide a kind of forming quality monitoring method, forming quality is carried out after every layer of shaping terminates Monitoring, solve the problems, such as it is existing scanning forming technique cannot real-time monitoring shaping process and forming quality.

It is a further object to provide a kind of increasing material manufacturing equipment for monitoring forming quality.

The technical solution adopted in the present invention is, a kind of forming quality monitoring method, after shaping scanning work starts, Scanning shaped one layer after, start to lay next layer of formed powder before, by by being arranged on taking the photograph above forming platform Camera shoots the photo in forming platform region, by the CNC Model of the photo internal shaping part current layer information and formation of parts Corresponding slicing layer contrast, calculate matching degree, if matching degree error permission in the range of, continue executing with scanning shaping work Make, if it is not, increasing material manufacturing equipment is stopped.

Further, the method specifically includes following steps:

Step 1, obtains current layer image information

Shaping scanning work start after, scanning shaped one layer after, start to lay next layer of formed powder before, The photo in forming platform region is shot by video camera, then by the corresponding image information that is pre-installed on industrial computer The photo vector quantization that reason software will shoot, and take relative coordinate system;

Step 2, the corresponding slicing layer information of acquisition current layer

By the relative co-ordinate information of formation of parts in the photo by shot by camera with by subdivision software obtain into The relative co-ordinate information of the corresponding slicing layer of CNC Model of shape part is adjusted to 1:1 proportionate relationship, and shot in current layer Take point (A, B) and point (X, Y) respectively on formation of parts in photo and on formation of parts respective slice layer, and make point (A, B) and Point (X, Y) is one-to-one relationship;

Step 3, image information compare with slicing layer information

The Vector Message of the image in point (A, B), the equal proportion radius corresponding shaped regions of R of (X, Y) is compared It is right, the Vector Message in the range of point (A, B), the equal proportion radius R corresponding to (X, Y) is then calculated by vector deviation Matching degree ∑, computer compares the value range Δ that Vector Message matching degree ∑ is allowed with error, if Vector Message matching degree ∑ In the range of the Δ that error is allowed, increasing material manufacturing equipment can then continue executing with the next layer of work of shaping scanning, otherwise increase material system Manufacturing apparatus stop shaping scanning work, treat artificially to have processed failure, start again at the work of shaping scanning.

Another technical scheme of the present invention is that a kind of increasing material manufacturing equipment for monitoring forming quality is wrapped The filming apparatus positioned at forming platform overlying regions are included, filming apparatus are connected with computer.

Further, filming apparatus are video camera.

The beneficial effects of the invention are as follows monitoring method of the invention can carry out monitor in real time to forming quality, with convenient to operate Personnel understand forming quality situation at any time, pinpoint the problems in time, slacken or even eliminate because cannot real-time monitoring shaping process And the quality of shaping, the problems such as the forming quality that causes is poor, part shaping fails.

Brief description of the drawings

Fig. 1 is the structural representation of the increasing material manufacturing equipment of present invention monitoring forming quality;

Fig. 2 is the principle flow chart of forming quality monitoring method of the present invention.

In figure, 1. working chamber's plane, 2. video camera, 3. industrial computer, 4. forming platform, 5. camera acquisition formed image area Domain, 6. relative coordinate system zero point, 7. formation of parts.

Specific embodiment

The present invention is described in further detail with reference to the accompanying drawings and detailed description, but the present invention is not limited to These implementation methods.

Device used in the present invention in the top centre position of working chamber's plane 1 as shown in figure 1, be provided with a shooting Machine 2, video camera 2 is connected by the industrial computer 3 with control shaping.The formed image region 5 that video camera 2 can be collected is comprising whole Individual forming platform 4.

After shaping scans through one layer, start to lay next layer of formed powder before, formation zone is shot by video camera The photo in domain;The photo is contrasted with the corresponding section in the CNC Model of formation of parts 7, matching degree is calculated, if matching Degree continues executing with scanning shaping work, if it is not, then increasing material manufacturing equipment alarm, is stopped in the range of error permission.

The method according to following steps as shown in Fig. 2 specifically implement:

Step 1, obtains current layer image information

Shaping scanning work start after, scanning shaped one layer after, start to lay next layer of formed powder before, The photo in forming platform region is shot by video camera, then by the corresponding image information that is pre-installed on industrial computer The photo vector quantization that reason software will shoot, and take relative coordinate system.

It is the 0. 6 of relative coordinate system wherein to take and be included in the lower right corner of the forming platform that camera acquisition is arrived, i.e. shaping The relative co-ordinate information of part, in the second the quadrant coordinate system region of relative coordinate system, as shown in Figure 1.

Step 2, the corresponding slicing layer information of acquisition current layer

Because relative co-ordinate information of each layer of formation of parts in relative coordinate system is all fixed, therefore assume shooting The relative coordinate values of the certain point on the photo captured by machine on formation of parts are (A, B).Take by subdivision software obtain into The relative coordinate values of the certain point of the corresponding slicing layer of CNC Model of shape part are (X, Y).

By image contrast conting, by the relative co-ordinate information of formation of parts in the photo by shot by camera with pass through The relative co-ordinate information of the corresponding slicing layer of CNC Model of the formation of parts that subdivision software is obtained is adjusted to 1:1 ratio is closed System, and cause the relative coordinate values taken on formation of parts on the photo of shot by camera for the point of (A, B) and by subdivision The relative coordinate values on formation of parts respective slice layer that software is obtained are for the point of (X, Y) is one-to-one relationship.

Step 3, image information compare with slicing layer information

The equal proportion radius corresponding formation zones of R of point (A, B), (X, Y) corresponding to two for being taken in step 2 Image in domain enters to compare, and compares the Vector Message in the range of its equal proportion radius R, is then calculated by vector deviation The Vector Message matching degree ∑ in the range of equal proportion radius R corresponding to point (A, B), (X, Y), then matches Vector Message Degree ∑ is sent in PLC.

The method that above-mentioned vector deviation is calculated is the equal ratio that the point corresponding to two is obtained by Da-Jin algorithm (OTSU methods) The gray threshold information of the image in the example radius corresponding shaped regions of R, it is assumed that two gray threshold information are respectively t (A, B) With t (X, Y).

1) image grey level histogram (having L gray level, each probability of occurrence is P) is set up

Pi=ni/N

2) probability of occurrence of background and target is calculated, computational methods are as follows:

Assume that t is selected threshold value in above formula, C represents background (gray level is 0~N), the element in histogram Understand, Pc is the probability that background occurs, similarly D is target, Pd is the probability that target occurs.

As from the foregoing:Above-mentioned suitable information matching degree ∑=| Pd (A, B)-Pd (X, Y) |.

Compare the value range Δ that Vector Message matching degree ∑ is allowed with error in PLC, if Vector Message matching degree ∑ In the range of the Δ that error is allowed, increasing material manufacturing equipment can then continue executing with the work of shaping scanning, and otherwise PLC will send phase The alarm answered, makes increasing material manufacturing equipment stop corresponding shaping scanning work, at this moment needs human intervention, treats Chu Liwan failures, Eliminate after alarm, can just start again at the work of shaping scanning.

Monitor in real time can be carried out to forming quality using above-mentioned monitoring method, so that operating personnel understand forming quality at any time Situation, pinpoints the problems in time, slacken or even eliminate because cannot real-time monitoring shaping process and shaping quality, cause into The problems such as shape is of poor quality, part shaping fails.

Claims (4)

1. a kind of forming quality monitoring method, it is characterised in that after shaping scanning work starts, scanning shaped one layer with Afterwards, before starting to lay next layer of formed powder, forming platform region is shot by being arranged on the video camera above forming platform Photo, the corresponding slicing layer in the photo internal shaping CNC Model of the part current layer information with formation of parts is done right Than, matching degree is calculated, if matching degree is in the range of error permission, scanning shaping work is continued executing with, if it is not, increasing material manufacturing sets It is standby to be stopped.
2. forming quality monitoring method according to claim 1, it is characterised in that comprise the following steps:
Step 1, obtains current layer image information
Shaping scanning work start after, scanning shaped one layer after, start to lay next layer of formed powder before, pass through Video camera shoots the photo in forming platform region, and then the corresponding Image Information Processing by being pre-installed on industrial computer is soft The photo vector quantization that part will shoot, and take relative coordinate system;
Step 2, the corresponding slicing layer information of acquisition current layer
By the relative co-ordinate information of formation of parts in the photo by shot by camera and the shaping zero obtained by subdivision software The relative co-ordinate information of the corresponding slicing layer of CNC Model of part is adjusted to 1:1 proportionate relationship, and shoot photo in current layer In formation of parts on and formation of parts respective slice layer on take point (A, B) and point (X, Y) respectively, and make point (A, B) and point (X, Y) it is one-to-one relationship;
Step 3, image information compare with slicing layer information
The Vector Message of the image in point (A, B), the equal proportion radius corresponding shaped regions of R of (X, Y) is compared, so The Vector Message being calculated in the range of point (A, B), the equal proportion radius R corresponding to (X, Y) by vector deviation afterwards is matched Degree ∑, computer compares the value range Δ that Vector Message matching degree ∑ is allowed with error, if Vector Message matching degree ∑ is by mistake In the range of the Δ that difference is allowed, increasing material manufacturing equipment can then continue executing with the next layer of work of shaping scanning, and otherwise increasing material manufacturing sets It is standby to stop shaping scanning work, treat artificially to have processed failure, start again at the work of shaping scanning.
3. a kind of increasing material manufacturing equipment for monitoring forming quality, it is characterised in that including positioned at forming platform overlying regions Filming apparatus, filming apparatus are connected with computer.
4. increasing material manufacturing equipment according to claim 3, it is characterised in that the filming apparatus are video camera.
CN201710044379.XA 2017-01-19 2017-01-19 A kind of forming quality monitoring method and increasing material manufacturing equipment CN106863784A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107672180A (en) * 2017-09-06 2018-02-09 哈尔滨理工大学 A kind of 3D printing accuracy checking method based on reverse Engineering Technology
CN107737927A (en) * 2017-09-22 2018-02-27 南京航空航天大学 A kind of method for improving Laser Melting Deposition forming quality

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105306925A (en) * 2015-10-09 2016-02-03 福州市超智电子科技有限公司 Monitoring system and monitoring method for video monitoring front-end equipment
CN105555509A (en) * 2013-08-07 2016-05-04 麻省理工学院 Automatic process control of additive manufacturing device
CN205498075U (en) * 2016-03-25 2016-08-24 北京鲜树叶科技发展有限公司 A status monitoring device for distributing three -dimensional printing apparatus of van -type
CN205829803U (en) * 2016-07-14 2016-12-21 杭州大穿越旅游策划有限公司 Camera system
CN106312062A (en) * 2016-08-02 2017-01-11 西安铂力特激光成形技术有限公司 Method for detecting powder laying quality and additive manufacturing device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105555509A (en) * 2013-08-07 2016-05-04 麻省理工学院 Automatic process control of additive manufacturing device
CN105306925A (en) * 2015-10-09 2016-02-03 福州市超智电子科技有限公司 Monitoring system and monitoring method for video monitoring front-end equipment
CN205498075U (en) * 2016-03-25 2016-08-24 北京鲜树叶科技发展有限公司 A status monitoring device for distributing three -dimensional printing apparatus of van -type
CN205829803U (en) * 2016-07-14 2016-12-21 杭州大穿越旅游策划有限公司 Camera system
CN106312062A (en) * 2016-08-02 2017-01-11 西安铂力特激光成形技术有限公司 Method for detecting powder laying quality and additive manufacturing device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107672180A (en) * 2017-09-06 2018-02-09 哈尔滨理工大学 A kind of 3D printing accuracy checking method based on reverse Engineering Technology
CN107672180B (en) * 2017-09-06 2019-10-01 哈尔滨理工大学 A kind of 3D printing accuracy checking method based on reverse Engineering Technology
CN107737927A (en) * 2017-09-22 2018-02-27 南京航空航天大学 A kind of method for improving Laser Melting Deposition forming quality

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