CN114228140A - Scraper detection method, three-dimensional object manufacturing equipment and powder spreading device thereof - Google Patents

Scraper detection method, three-dimensional object manufacturing equipment and powder spreading device thereof Download PDF

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Publication number
CN114228140A
CN114228140A CN202111373680.8A CN202111373680A CN114228140A CN 114228140 A CN114228140 A CN 114228140A CN 202111373680 A CN202111373680 A CN 202111373680A CN 114228140 A CN114228140 A CN 114228140A
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Prior art keywords
scraper
detection points
difference
detection
distance
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CN202111373680.8A
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CN114228140B (en
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梁冬生
司妞
黄鸿喜
陈锐敏
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Hunan Farsoon High Tech Co Ltd
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Hunan Farsoon High Tech Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/141—Processes of additive manufacturing using only solid materials
    • B29C64/153—Processes of additive manufacturing using only solid materials using layers of powder being selectively joined, e.g. by selective laser sintering or melting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B29C64/205—Means for applying layers
    • B29C64/214—Doctor blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/30—Auxiliary operations or equipment
    • B29C64/386—Data acquisition or data processing for additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE 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
    • B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE 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
    • B33Y50/00—Data acquisition or data processing for additive manufacturing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Abstract

The invention relates to a scraper detection method, which comprises the following steps: placing a laser rangefinder on the leveled piston plate; respectively acquiring the distance between N first detection points on the surface of the scraper seat and the distance between N second detection points on the bottom surface of the scraper, which are respectively in one-to-one correspondence with the first detection points, by using a laser distance meter, wherein the corresponding first detection points and the corresponding second detection points are positioned on the same vertical line; and respectively calculating the distance difference between the N first detection points and the N second detection points, and judging whether the scraper is intact, damaged or worn according to the distance difference. The scraper detection method of the invention utilizes the piston plate which needs to be leveled before construction, saves operation procedures, and because the piston plate is in a leveling state, the laser range finder arranged on the piston plate can accurately judge whether the scraper is intact, or worn or damaged by measuring the corresponding first detection point and the second detection point. Therefore, the invention has higher accuracy, simpler structure and simpler and more convenient operation.

Description

Scraper detection method, three-dimensional object manufacturing equipment and powder spreading device thereof
Technical Field
The invention relates to the field of additive manufacturing, in particular to a scraper detection method, three-dimensional object manufacturing equipment and a powder spreading device thereof.
Background
Additive Manufacturing (AM) is an advanced Manufacturing technology with the advantages of digital Manufacturing, high flexibility and adaptability, direct CAD model driving, rapidness, rich and diverse material types, and the like. Among them, Selective Laser Melting (SLM) is one of the additive manufacturing technologies that have been rapidly developed in recent years, in which a powder material is used as a raw material, and Laser is used to scan the cross section of a three-dimensional entity layer by layer to complete prototype manufacturing, which is not limited by the complexity of the shape, does not require any tooling mold, and has a wide application range.
The selective laser melting process includes feeding certain amount of powder to the bench, spreading one layer of powder material on the upper surface of the formed part in the forming cylinder, controlling the laser to scan the powder layer in the solid part according to the cross section contour of the layer to raise the temperature of the powder to the melting point, and melting and sintering the powder to adhere the formed part. After the sintering of one layer of section is finished, the workbench descends by the thickness of one layer, the powder laying device lays a layer of uniform and compact powder on the workbench, and the scanning sintering of the section of a new layer is carried out until the manufacturing of the whole three-dimensional object is finished.
At present, a scraper becomes a common component of a powder spreading device, the control precision of the scraper plays a crucial role in manufacturing the whole three-dimensional object, if the scraper is damaged or abraded, the printing quality of a workpiece is poor, and even printing failure is caused, so that huge loss is brought.
In order to solve the technical problems, a manual detection method is provided at present, and the specific method is that after a scraper positioned on a scraper seat is installed, a piston is moved to an upper limit position, and a clearance gauge is adopted to detect the distance between the upper surface of the piston and the surface of the scraper.
In the prior art, an adaptive scraper detection method is also provided, the detection method adopts online detection, is installed on a scraper seat, detects a powder spreading surface along with the movement of a scraper, and judges whether the powder spreading surface is worn or damaged by judging the position of a detection point. Moreover, the mounting position of the detection point is fixed, the position can not be flexibly changed, and the detection point only corresponds to a plurality of fixed positions on the powder surface (because if the position of the detection point is adjustable, even if the whole powder surface is possibly uneven, the detection point in the same plane can be selected as much as possible for detection, and the trouble of spreading powder again is avoided), so that the detection has errors as long as the powder surfaces at the fixed positions are uneven. Even though those skilled in the art recognize the importance of flour flatness, the flour needs to be re-spread and the flour detection needs to be performed again to ensure the flatness of the flour at several fixed positions. However, the method is carried out during construction, such re-powder laying and re-detection bring great inconvenience to the control flow of the construction process, and the operation flow is more complicated, thereby greatly influencing the production efficiency of the workpiece to be printed.
Disclosure of Invention
Therefore, the scraper detection method, the three-dimensional object manufacturing equipment and the powder spreading device thereof are needed to be capable of detecting whether the scraper is normal or worn or damaged and not to timely find the problem that the quality of the workpiece is affected by the abrasion or damage of the traditional scraper.
In order to achieve the purpose, the invention provides a scraper detection method, which comprises the following steps:
1) placing a laser rangefinder on the leveled piston plate;
2) respectively acquiring the distance between N first detection points on the surface of the scraper seat and the distance between N second detection points on the bottom surface of the scraper, which are respectively in one-to-one correspondence with the first detection points, by using a laser distance meter, wherein the corresponding first detection points and the corresponding second detection points are positioned on the same vertical line;
3) and respectively calculating the distance difference between the N first detection points and the N second detection points, and judging whether the scraper is intact, damaged or worn according to the distance difference.
As a further preferable embodiment of the present invention, the step 3) specifically includes the steps of:
calculating the distance difference between the first detection point and the corresponding second detection point one by one to obtain N difference values;
when the difference between the N difference values and the height of the scraper is smaller than an allowable error, judging that the scraper is intact;
when the difference between any one of the N difference values and the height of the scraper is greater than or equal to an allowable error and smaller than a first preset value, judging that the scraper is worn;
and when the difference between any one of the N difference values and the height of the scraper is greater than or equal to a first preset value, judging that the scraper is damaged, wherein the first preset value is greater than an allowable error.
As a further preferable aspect of the present invention, the N first detection points are uniformly located on the surface of the scraper seat.
As a further preferred aspect of the invention, the laser rangefinder is placed at any position on the leveled piston plate.
As a further preferable aspect of the present invention, the tolerance is one fourth of the thickness of the powder bed layer.
As a further preferable aspect of the present invention, the first preset value is one-half of the thickness of the powder bed layer.
The invention also provides a powder laying device of the three-dimensional object manufacturing equipment, which comprises:
the laser range finder is placed on the leveled piston plate and used for respectively obtaining the distance between N first detection points on the surface of the scraper seat and the distance between N second detection points which are respectively in one-to-one correspondence with the first detection points on the bottom surface of the scraper, and the corresponding first detection points and the corresponding second detection points are positioned on the same vertical line;
and the processing unit is used for respectively calculating the distance difference between the N first detection points and the N second detection points and judging whether the scraper is intact, damaged or worn according to the distance difference.
As a further preferable aspect of the present invention, the processing unit includes:
the calculating module is used for calculating the distance difference between the first detection point and the corresponding second detection point one by one to obtain N difference values;
the first judgment module is used for judging that the scraper is intact when the difference between the N difference values and the height of the scraper is smaller than an allowable error;
the second judgment module is used for judging the abrasion of the scraper when the difference between any one of the N difference values and the height of the scraper is greater than or equal to an allowable error and smaller than a first preset value;
and the third judging module is used for judging that the scraper is damaged when the difference between any one of the N difference values and the height of the scraper is greater than or equal to a first preset value, wherein the first preset value is greater than an allowable error.
As a further preferable aspect of the present invention, the tolerance is one fourth of the thickness of the powder bed layer, and the first preset value is one half of the thickness of the powder bed layer.
The invention also provides three-dimensional object manufacturing equipment, which comprises the powder laying device of the three-dimensional object manufacturing equipment.
The scraper detection method, the three-dimensional object manufacturing equipment and the powder spreading device thereof respectively obtain the distance between N first detection points on the surface of a scraper seat and the distance between N second detection points which are respectively corresponding to the first detection points one by one on the bottom surface of the scraper by the laser range finder arranged on the leveled piston plate, respectively calculate the distance difference between the N first detection points and the N second detection points, and judge whether the scraper is in good condition, damaged or worn according to the distance difference, so that on one hand, the piston plate which needs to be leveled before construction is utilized, the operation program is saved, on the other hand, because the piston plate is in a leveling state, the laser range finder arranged on the piston plate can accurately judge whether the scraper is in good condition, worn or damaged by measuring the first detection points on the surface of the scraper seat and the second detection points on the corresponding bottom surface of the scraper, therefore, compared with the self-adaptive scraper detection method in the prior art, the method is higher in accuracy, simpler in structure and simpler and more convenient to operate.
Drawings
FIG. 1 is a flow chart of one embodiment of a blade inspection method of the present invention;
FIG. 2 is a system block diagram of one embodiment of the powder laying apparatus of the three-dimensional object manufacturing apparatus of the present invention;
FIG. 3 is a system block diagram of one embodiment of a processing unit of the present invention;
fig. 4 is a schematic diagram of the operation of an embodiment of the doctor blade detection method according to the present invention.
The figures are labeled as follows:
1. piston plate, 2, laser range finder, 3, scraper, 4, scraper seat.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Three-dimensional object manufacturing equipment, i.e. additive manufacturing equipment as mentioned in the background above, selective laser melting processes are one of the techniques employed. The three-dimensional object manufacturing equipment comprises a scanning system, a powder laying device, a powder feeding device, a forming cylinder and the like, wherein the powder laying device mainly comprises a scraper mechanism and a driving mechanism for driving the scraper mechanism to reciprocate on a working plane, and the scraper mechanism comprises a scraper seat 4 and a scraper 3 arranged at the bottom of the scraper seat 4; the forming cylinder comprises a cylinder body wall for supporting, a piston plate 1 and a driving mechanism for driving the piston plate 1 to move up and down in the cylinder body wall, so that the plane position of the working plane is controlled. Currently, the piston plate 1 must be leveled before construction to ensure the flatness of the work plane and thus the printing accuracy, and therefore, the leveling of the piston plate, i.e., the substrate leveling, is an essential step for the conventional art.
As shown in fig. 1, the present invention provides a doctor blade detection method, including the following steps:
step S1, placing the laser range finder 2 on the leveled piston plate 1, wherein in the specific implementation process, the laser range finder can be placed at any position on the leveled piston plate 1, and the central position is a preferred position; it is also possible to have any height position where the piston plate 1 stays, for example, any height position in the vertical direction where the piston plate 1 stays under the driving of the driving mechanism, and thus it can be seen that the detection method of the present invention has lower requirements for the placement position of the laser distance meter 2, and the scraper 3 detection can be performed at any time before the construction as long as the piston plate 1 is leveled, i.e., the operation is simpler.
Step S2, respectively obtaining the distance between N first detection points on the surface of the scraper seat 4 and the distance between N second detection points on the bottom surface of the scraper 3 and the first detection points, wherein the N second detection points are respectively in one-to-one correspondence with the first detection points, and the corresponding first detection points and the corresponding second detection points are positioned on the same vertical line; in specific implementation, a connection line of the N first detection points may be a straight line, a broken line or a curve, and is preferably a straight line, so that acquisition and calculation are facilitated; similarly, the connection line of the N second detection points may be a straight line, a broken line or a curved line, and is preferably a straight line, which is convenient for obtaining and calculating.
Preferably, the N first detection points and the N second detection points are uniformly distributed, and the more the number of the first detection points and the second detection points is, the more accurate the measurement is, however, the calculation may be slightly responsible, and therefore, for the effect of both accuracy and simplicity of calculation, the number of the first detection points and the number of the second detection points are 6 or 8 and are uniformly distributed on the surface of the scraper seat 4 and the bottom surface of the scraper 3, respectively.
It should be emphasized that the first and second detection points should cover the length of the doctor holder 4 and the doctor blade 3 or run lengthwise of the doctor blade 3, so as to ensure the comprehensiveness of the detection of the doctor blade 3.
As shown in fig. 4, B1, B2, B3, B4, B5, and a.9.. times, Bn of the bottom surface of the doctor blade 3 are detected by the laser distance measuring device 2, and the distances of h1, h2, h3, h4, h5, a.9.. times, hn are detected, and the distances of a1, a2, A3, A4, A5, a.9.. times, An of the surface of the doctor holder 4 are detected as S1, S2, S3, S4, S5, a.t.. times, Sn are detected.
Step S3, calculating distance differences between the N first detection points and the N second detection points, and determining whether the scraper 3 is damaged or worn according to the distance differences.
Specifically, the step S3 specifically includes the steps of:
step S31, calculating the distance difference between the first detection point and the corresponding second detection point one by one to obtain N difference values;
step S32, when the difference between the N difference values and the height of the scraper 3 is smaller than an allowable error, judging that the scraper 3 is intact;
step S33, when the difference between any one of the N difference values and the height of the scraper 3 is greater than or equal to an allowable error and smaller than a first preset value, judging that the scraper 3 is worn;
and step S34, determining that the scraper 3 is damaged when the difference between any one of the N difference values and the scraper height is greater than or equal to a first preset value, where the first preset value is greater than an allowable error.
It should be noted here that the tolerance, the first preset value, may be specifically determined according to the thickness of the powder coating layer, and specifically, the tolerance may be one fourth of the thickness of the powder coating layer. Ideally, when the scraper 3 is intact, the difference between the N differences and the height of the scraper 3 is 0, however, limited by the detection accuracy of the laser range finder 2 and other factors, the scraper 3 is considered to be intact when the difference between the N differences and the height of the scraper 3 is less than the allowable error. Similarly, according to multiple tests and the degree of influence of abrasion of the scraper 3 on printing, the first preset value is set to be one half of the thickness of the powder spreading layer, and the first preset value can be specifically determined according to different materials of the powder and different thicknesses of the powder, which are not listed here.
Referring to fig. 4, S1-h1= d1, S2-h2= d2, S3-h3= d3, S4-h4= d4, S5-h5= d5,..... and Sn-hn = dn are sequentially combined to obtain N differences d1, d2, d3, d4, d5,..... and dn;
the thickness of the existing powder layer is generally 0.02-0.12 mm, taking the thickness of the powder layer as 0.1mm as an example;
when the difference between the N differences and the height of the scraper 3 is less than 0.025mm, judging that the scraper 3 is intact;
when the difference between any one of the N differences and the height of the scraper 3 is larger than 0.025mm and smaller than 0.05mm, judging that the scraper 3 is worn;
and when the difference between any one of the N differences and the height of the scraper 3 is greater than or equal to 0.05mm, judging that the scraper 3 is damaged.
As shown in fig. 2, the present invention also provides a powder spreading device of a three-dimensional object manufacturing apparatus, comprising:
the laser range finder 2 is arranged on the leveled piston plate 1 and is used for respectively obtaining the distance between N first detection points on the surface of the scraper seat 4 and the distance between N second detection points which are respectively in one-to-one correspondence with the first detection points on the bottom surface of the scraper 3, and the corresponding first detection points and the corresponding second detection points are positioned on the same vertical line;
and the processing unit is used for respectively calculating the distance difference between the N first detection points and the N second detection points and judging whether the scraper 3 is damaged or abraded according to the distance difference.
It should be noted that the powder laying device of the three-dimensional object manufacturing equipment of the present invention mainly describes only the device having the function of detecting the scraper 3, and other parts of the prior art, such as a scraper mechanism and a driving mechanism, are not mentioned here.
With further reference to fig. 3, the processing unit includes:
the calculating module is used for calculating the distance difference between the first detection point and the corresponding second detection point one by one to obtain N difference values;
the first judging module is used for judging that the scraper 3 is intact when the difference between the N difference values and the height of the scraper 3 is smaller than an allowable error;
the second judging module is used for judging the abrasion of the scraper 3 when the difference between any one of the N difference values and the height of the scraper 3 is greater than or equal to an allowable error and smaller than a first preset value;
and the third judging module is used for judging that the scraper 3 is damaged when the difference between any one of the N difference values and the height of the scraper 3 is greater than or equal to a first preset value, wherein the first preset value is greater than an allowable error.
In specific implementation, the allowable error is one fourth of the thickness of the powder spreading layer, and the first preset value is one half of the thickness of the powder spreading layer.
Based on the powder paving device, the invention also provides three-dimensional object manufacturing equipment, which comprises the powder paving device of the three-dimensional object manufacturing equipment in any embodiment.
Compared with the prior art, the scraper detection method, the three-dimensional object manufacturing equipment and the powder spreading device thereof have the following advantages:
1. the laser distance measuring instrument 2 which is placed on the piston plate 1 which is leveled before construction is used for detecting and judging whether the scraper 3 is damaged or abraded, so that the piston plate 1 which needs to be leveled before construction is utilized, and the operation procedure is saved;
2. because the piston plate 1 is in a leveling state, the laser range finder 2 placed on the piston plate can accurately judge whether the scraper 3 is intact, worn or damaged or not by measuring a first detection point on the surface of the scraper seat 4 and a second detection point on the bottom surface of the corresponding scraper 3, and compared with the self-adaptive scraper detection method in the prior art, the method has the advantages of higher accuracy, simpler structure and simpler and more convenient operation;
3. the laser range finder 2 is high in accuracy, and compared with a manual clearance gauge measuring method and a self-adaptive detecting method, the laser range finder 2 is flexible in position arrangement, and the piston semi-plane can be located at a random position.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A scraper detection method is characterized by comprising the following steps:
1) placing a laser rangefinder on the leveled piston plate;
2) respectively acquiring the distance between N first detection points on the surface of the scraper seat and the distance between N second detection points on the bottom surface of the scraper, which are respectively in one-to-one correspondence with the first detection points, by using a laser distance meter, wherein the corresponding first detection points and the corresponding second detection points are positioned on the same vertical line;
3) and respectively calculating the distance difference between the N first detection points and the N second detection points, and judging whether the scraper is intact, damaged or worn according to the distance difference.
2. The blade detection method according to claim 1, characterized in that said step 3) comprises in particular the steps of:
calculating the distance difference between the first detection point and the corresponding second detection point one by one to obtain N difference values;
when the difference between the N difference values and the height of the scraper is smaller than an allowable error, judging that the scraper is intact;
when the difference between any one of the N difference values and the height of the scraper is greater than or equal to an allowable error and smaller than a first preset value, judging that the scraper is worn;
and when the difference between any one of the N difference values and the height of the scraper is greater than or equal to a first preset value, judging that the scraper is damaged, wherein the first preset value is greater than an allowable error.
3. The blade inspection method of claim 1 wherein the N first inspection points are uniformly located on the surface of the blade holder.
4. The blade detection method of claim 1 wherein the laser rangefinder is placed at any location on the leveled piston plate.
5. The blade inspection method of any of claims 1 to 4, wherein the tolerance is one quarter of the thickness of the dusting layer.
6. The doctor blade detection method according to claim 5, characterised in that the first preset value is half the thickness of the dusting layer.
7. A powder paving device of three-dimensional object manufacturing equipment is characterized by comprising:
the laser range finder is placed on the leveled piston plate and used for respectively obtaining the distance between N first detection points on the surface of the scraper seat and the distance between N second detection points which are respectively in one-to-one correspondence with the first detection points on the bottom surface of the scraper, and the corresponding first detection points and the corresponding second detection points are positioned on the same vertical line;
and the processing unit is used for respectively calculating the distance difference between the N first detection points and the N second detection points and judging whether the scraper is intact, damaged or worn according to the distance difference.
8. The powder spreading device of a three-dimensional object manufacturing apparatus according to claim 7, wherein the processing unit includes:
the calculating module is used for calculating the distance difference between the first detection point and the corresponding second detection point one by one to obtain N difference values;
the first judgment module is used for judging that the scraper is intact when the difference between the N difference values and the height of the scraper is smaller than an allowable error;
the second judgment module is used for judging the abrasion of the scraper when the difference between any one of the N difference values and the height of the scraper is greater than or equal to an allowable error and smaller than a first preset value;
and the third judging module is used for judging that the scraper is damaged when the difference between any one of the N difference values and the height of the scraper is greater than or equal to a first preset value, wherein the first preset value is greater than an allowable error.
9. The powder spreading device of a three-dimensional object manufacturing apparatus according to claim 8, wherein the tolerance is one-fourth of the thickness of the powder spreading layer, and the first preset value is one-half of the thickness of the powder spreading layer.
10. A three-dimensional object manufacturing apparatus comprising the powder spreading device of the three-dimensional object manufacturing apparatus according to any one of claims 7 to 9.
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