CN112223746A - Calibration method for high-precision processing base point of 3D printing equipment - Google Patents
Calibration method for high-precision processing base point of 3D printing equipment Download PDFInfo
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- CN112223746A CN112223746A CN202010825176.6A CN202010825176A CN112223746A CN 112223746 A CN112223746 A CN 112223746A CN 202010825176 A CN202010825176 A CN 202010825176A CN 112223746 A CN112223746 A CN 112223746A
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- scraper
- parallel plate
- printing
- adjusting screw
- fixed plane
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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
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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
- B29C64/30—Auxiliary operations or equipment
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- 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
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
Abstract
The invention discloses a calibration method for a high-precision processing base point of 3D printing equipment, which comprises the following steps: selecting a fixed plane as a reference, installing a parallel plate, placing the parallel plate below a laser source, wherein the parallel plate is parallel to and higher than the fixed plane, calibrating the focal plane of the laser source by taking the parallel plate as the reference, and rotating the laser source within a preset range to ensure that the focal points of the laser source fall on the parallel plate; calibrating the dimensional accuracy of the printing position of the laser printing product, determining the surface position of the laser printing position on the parallel plate and each coordinate position of the laser printing on the upper surface of the parallel plate; and calibrating the scraper with the fixed plane, and confirming the height between the scraper and the fixed plane to determine the height between the scraper and the printing position. The height coincidence of a processing surface formed by powder spreading on the lower surface of the scraper and a laser focus surface can be ensured, and the repeatability and stability of high-precision production are ensured.
Description
Technical Field
The invention relates to the technical field of 3D printing equipment, in particular to a calibration method for a high-precision processing base point of 3D printing equipment.
Background
3D printer is more and more widely used in various fields, and to the requirement of medical products (such as collimator), its work piece that prints guarantees the error within 0.02mm to the high precision that turns to from the roughness to the high precision of product, then improves to a very high level to 3D printing precision. In order to improve the printing (processing) quality, the laser source and the scraper need to be adjusted before printing (processing). The laser source is required to be adjusted and calibrated firstly, then the scraper is adjusted, the adjustment of the laser source and the scraper is vital to the printing and forming of parts, and the forming quality is determined by the parallelism and the height of the upper surface of the powder after the powder is paved, the parallelism and the height of the surface and the relative parallelism and the relative height of a laser focal plane directly determined by the lower surface of the scraper, so that the product precision is improved by the adjustment of the scraper.
Therefore, it is necessary to provide a calibration method for high-precision processing of the base point by the 3D printing device to realize printing of high-precision products.
Disclosure of Invention
The invention aims to provide a calibration method for a high-precision processing base point of 3D printing equipment, which is used for printing a high-precision product.
In order to achieve the purpose, the invention adopts the following technical scheme: a calibration method for a high-precision processing base point of a 3D printing device comprises the following steps:
(1) selecting a fixed plane as a reference, installing a parallel plate, placing the parallel plate below a laser source, wherein the parallel plate is parallel to and higher than the fixed plane, calibrating the focal plane of the laser source by taking the parallel plate as the reference, and rotating the laser source within a preset range to ensure that the focal points of the laser source fall on the parallel plate;
(2) calibrating the dimensional accuracy of the printing position of the laser printing product, determining the surface position of the laser printing position on the parallel plate and each coordinate position of the laser printing on the upper surface of the parallel plate;
(3) removing the parallel plates;
(4) and calibrating the scraper with the fixed plane, and confirming the height between the scraper and the fixed plane to determine the height between the scraper and the printing position.
The fixed plane is a middle flat plate between the forming cylinder and the powder cylinder.
The parallel plate is arranged in the forming cylinder, is placed on the upper surface of a processing plate, and is determined to be within a preset required value with the upper surface of the parallel plate and the fixed plane by adjusting the height of the processing plate.
The scraper takes the fixed plane as a reference, so that the lower surface of the scraper is kept horizontal, and the lower surface of the scraper is positioned higher than the fixed plane, and a preset gap is reserved between the scraper and the fixed plane, wherein the gap is the same as the height difference between the parallel plate and the middle flat plate.
The 3D printing equipment is provided with a scraper component, wherein the scraper component comprises a scraper, a pair of clamping plates arranged on the scraper, a fixing frame for fixing the clamping plates and an adjusting knob arranged on the fixing frame.
The scraper is the plastic material, for the triangle-shaped post structure that falls, and it has the scraping portion that is located the front end and inwards caves in a pair of relative first recess that forms and neighbouring from scraper both sides face first protruding first boss that stretches of formation of first recess, splint have with the second lug that the first recess of scraper was held mutually and with the second recess that first boss was held mutually, fix two splint together through a plurality of screws, should laminate mutually to the splint, first recess with the mutual card of second lug is held, first boss with the mutual card of second recess is held.
The fixing frame is provided with a notch formed by inwards sinking from one side surface of the fixing frame, a plurality of first adjusting grooves formed by inwards sinking from the other side surface of the fixing frame and communicated with the notch, and a second adjusting groove which is downwards sunk from the upper surface of the fixing frame and communicated with the notch; first adjustment tank is vertical extension's lengthwise structure, install first adjusting screw in the first adjustment tank, first adjusting screw's end with splint threaded connection each other, second adjusting screw is installed to the second adjustment tank, the end of second adjusting screw supports and leans on the upper surface of this pair of splint.
When the position of the scraper is not in accordance with the preset requirement, the first adjusting screw and the second adjusting screw are adjusted to enable the scraper and the clamping plate to be kept at reasonable positions, the first adjusting screw and the second adjusting screw are installed through preset installation positions, and the first adjusting screw and the second adjusting screw are rotated through preset torque so that the scraper is at the preset position.
The calibration method for the high-precision processing base point of the 3D printing equipment has the beneficial technical effects that: the fixed plane is used as a calibration standard of all moving parts, no extra mechanical error exists because the fixed plane is a non-moving device, all moving devices are calibrated by taking the non-moving device as a standard, and a plug gauge is used as a measuring tool. The laser processing device can ensure that the height of a processing surface formed by powder paving on the lower surface of the scraper is overlapped with the height of a laser focus surface every time the scraper is replaced, and ensures the repeatability and stability of high-precision production.
The problem of processing board unevenness can not lead to the degree of overlap to appear the deviation, to the requirement greatly reduced of the machining precision of processing board, to the installation requirement greatly reduced of the processing board of production at every turn, the processing board because the processing board upper surface that deformation, foreign matter, processing harmfulness scheduling problem lead to does not coincide with the middle flat plate of powder jar, can not lead to the skew of processing plane.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a 3D printing device;
FIG. 2 is an angled schematic view of a doctor assembly of the 3D printing apparatus;
FIG. 3 is another angle schematic of the doctor assembly shown in FIG. 2;
fig. 4 shows a product printed by the 3D printing apparatus according to the present invention, which has a porous structure and dense pores, and cannot be processed by a mold or CNC.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood by those skilled in the art, the present invention is further described with reference to the accompanying drawings and examples. Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
As shown in fig. 1 to 2, the present invention discloses a 3D printing apparatus, which includes a worktable 10, a laser source 20 installed on the worktable 10, a processing station 30 located on the worktable 10, and a blade assembly 40. The processing station 30 comprises a powder cylinder 31 for placing powder and a forming cylinder 32 for processing a printed workpiece, a processing plate 33 which is gradually lowered by an automatic device 50 (a prior art product) is arranged in the forming cylinder 32, and after the powder is pushed onto the processing plate 33 by a scraper assembly, the laser source 20 sends laser to the powder, so that the powder is sintered by the laser to form the workpiece.
The scraper assembly 40 includes a scraper 4, a pair of clamping plates 5 mounted on the scraper 4, a holder 6 for holding the clamping plates 5, and an adjustment knob 7 mounted on the holder 6. The scraper assembly 40 is mounted on a slider (not shown) that is pushed by an external force and is mounted in the track, thereby moving the scraper back and forth. The scraper 4 is made of plastic material and has an inverted triangular prism structure, which has a scraping part 41 at the front end, a pair of opposite first grooves 42 formed by inward recession from both sides of the scraper, and a first protruding boss 43 formed by protruding adjacent to the first grooves 42. The fixing clip 5 has a second projection 51 that is caught by the first groove 42 of the scraper 4 and a second groove 52 that is caught by the first projection 43. The two clamping plates 6 are fixed together by a plurality of screws, the clamping plates 6 are attached to each other, the first groove 42 and the second protrusion 51 are clamped to each other, and the first boss 43 and the second groove 52 are clamped to each other. The fixing frame 6 has a notch 61 formed by recessing inward from one side surface thereof, a plurality of first adjustment grooves 62 formed by recessing inward from the other side surface thereof and penetrating the notch 61, and a second adjustment groove 63 recessed downward from the upper surface thereof and penetrating the notch 61. The first adjusting groove 62 is a vertically extending lengthwise structure, a first adjusting screw 8 is installed in the first adjusting groove 62, and the tail end of the first adjusting screw 8 is in threaded connection with the clamping plate 5 inside. The second adjustment groove 63 mounts a second adjustment screw 9, the tip of which abuts against the upper surface of the pair of chucking plates 5.
Referring to fig. 4, the processed product required by the 3D printer of the present invention is a porous structure, has a very small size of less than 1mm, cannot be realized by a die or CNC processing, and needs to be processed in batch by the 3D printer.
In batches before processing, need process the basic point to 3D printing apparatus and calibrate, ensure that the product size of processing is accurate, the plane degree and the straightness that hangs down of product all satisfy the requirement.
The calibration step of the 3D printing equipment for processing the base point comprises the following steps:
(1) selecting a fixed plane 34 as a reference, installing a parallel plate 90, placing the parallel plate 90 below the collimated laser source 20, aligning the focal plane of the laser source 20 with the parallel plate 90 as a reference, and rotating the laser source 20 within a preset range to ensure that the focal point of the laser source 20 is all on the parallel plate 90.
Specifically, a fixed plane on the workbench 10 is selected, the fixed plane is kept horizontal, the fixed plane 34 is a fixed plane on the 3D printing device, and the position of the fixed plane is always unchanged when the 3D printing device works or does not work; the fixed plane can be selected from the middle flat plate 34 between the forming cylinder 32 and the powder cylinder 33, a high-precision parallel plate 90 with the parallelism of the upper surface and the lower surface within 0.01mm is provided, the size of the high-precision parallel plate is equivalent to that of the forming cylinder 32, the high-precision parallel plate is arranged in the forming cylinder 32 and is placed on the upper surface of the processing plate 33, whether the upper surface of the parallel plate 90 is within a preset required value of the fixed plane 34 is measured by a height gauge by adjusting the height of the processing plate 33, the parallel plate 90 is generally required to be 0.03mm higher than the middle flat plate 34 of the forming cylinder 32 and the powder cylinder 31 by an error of 0.005mm, and the height is the same as the height of a disposable printed product of a 3.
By rotating the zoom knob of the upper collimating mirror of the laser source 20 and the height of the F-theta lens, the focal plane of the laser is completely coincident with the upper surface of the parallel plate 90 within 0.1mm of error (this is because the focal plane of the laser has a relatively good focusing effect within ± 0.2mm, although focusing is not affected, size change is significantly affected, and printing is performed on the focal plane, the laser spot is the finest, and higher precision printing can be achieved).
(2) The dimensional accuracy of the laser printing position is calibrated, the position of the laser printing position on the surface of the parallel plate 90 is determined, and the respective coordinate positions of the laser printing position on the surface of the parallel plate 90 are determined.
And measuring the coordinate position of each grid node required by the workpiece to be printed, for example, inputting the grid with the laser printing interval of about 5mm on the upper surface of the parallel plate 90 into a laser galvanometer control system to finish the calibration of the printing size of the product, wherein the deviation of the printing size is controlled within 0.02 mm.
(3) Removing the parallel plate 90;
(4) the doctor blade is calibrated with a fixed plane, and the height between the doctor blade and the fixed plane is confirmed to determine the height of the doctor blade from the printing position.
Specifically, the lower surface of the blade 4 is kept horizontal with the fixed plane 34 as a reference, and the lower surface is located higher than the fixed plane 34 with a predetermined gap therebetween. The gap is the same as the difference in height between the parallel plate 90 and the intermediate flat plate 34.
Install scraper 4 in splint 5, when the position of scraper is not conform to and predetermine the requirement, adjust first adjusting screw 8 and second adjusting screw 9, so that scraper 4 and splint 5 can keep in reasonable position (predetermine the position), install first adjusting screw 8 and second adjusting screw 9 through predetermined mounted position, and rotate first adjusting screw 8 and second adjusting screw 9 so that the scraper is in predetermineeing the position through predetermined moment of torsion, and indeformable, and guarantee that the scraper does not rock, avoid influencing the shop powder homogeneity.
When the position of the scraper does not meet the preset requirements, the scraper clamping plate is pressed down by adjusting the second adjusting screw 9, for example: and (3) adjusting the clearance between the scraper and the middle flat plate of the powder cylinder by about 0.05mm each time, measuring the clearance by using a sheet plug gauge, adjusting the jackscrew by 0.01mm each time after the plug gauge with 0.1mm cannot enter the clearance, and measuring the feeler gauge once each time until the feeler gauge enters the clearance just 0.02mm and cannot enter the clearance by 0.04mm each time. At the moment, the lower surface of the surface scraper is 0.03mm higher than the middle flat plate of the forming cylinder and the powder cylinder, and the error is +/-0.01 mm and almost completely coincides with the focal plane of the laser. If the scraper is adjusted too tightly by carelessness and the plug gauge with 0.02mm cannot enter the gap, the second adjusting screw 9 is adjusted again. After the scraper is adjusted, powder is loaded in the powder cylinder 31.
The fixed plane (the middle plate between the powder cylinder 31 and the forming cylinder 32) is used as the calibration standard of all moving parts, and because the fixed plane is a non-moving device, no extra mechanical error exists, and all moving devices are calibrated by taking the non-moving device as the standard and taking a plug gauge as a measuring gauge. The laser processing device can ensure that the height of a processing surface formed by powder paving on the lower surface of the scraper is overlapped with the height of a laser focus surface every time the scraper is replaced, and ensures the repeatability and stability of high-precision production.
The deviation of the overlapping degree caused by the unevenness of the processing plate 33 can be avoided, the requirement on the processing precision of the processing plate 33 is greatly reduced, the installation requirement on the processing plate 33 produced at each time is also greatly reduced, and the deviation of a processing plane can be avoided due to the fact that the upper surface of the processing plate 33 is not overlapped with the middle flat plate of the powder cylinder because of the problems of deformation, foreign matters, poor processing and the like of the processing plate 33.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Various equivalent changes and modifications can be made by those skilled in the art based on the above embodiments, and all equivalent changes and modifications within the scope of the claims should fall within the protection scope of the present invention.
Claims (8)
1. A calibration method for a high-precision processing base point of a 3D printing device is characterized by comprising the following steps:
(1) selecting a fixed plane as a reference, installing a parallel plate, placing the parallel plate below a laser source, wherein the parallel plate is parallel to and higher than the fixed plane, calibrating the focal plane of the laser source by taking the parallel plate as the reference, and rotating the laser source within a preset range to ensure that the focal points of the laser source fall on the parallel plate;
(2) calibrating the dimensional accuracy of the printing position of the laser printing product, determining the surface position of the laser printing position on the parallel plate and each coordinate position of the laser printing on the upper surface of the parallel plate;
(3) removing the parallel plates;
(4) and calibrating the scraper with the fixed plane, and confirming the height between the scraper and the fixed plane to determine the height between the scraper and the printing position.
2. The method for calibrating a high-precision machining base point of a 3D printing device according to claim 1, wherein the fixed plane is an intermediate flat plate located between a forming cylinder and a powder cylinder.
3. The method for calibrating a high-precision machining base point of a 3D printing apparatus according to claim 1, wherein the parallel plate is installed in the forming cylinder, placed on an upper surface of a machining plate, and the upper surface of the parallel plate and the fixed plane are determined to be within a predetermined required value by adjusting the height of the machining plate.
4. The calibration method for a high-precision machining base point of a 3D printing apparatus according to claim 1, wherein the scraper is based on the fixed plane so that the lower surface of the scraper is kept horizontal and is positioned higher than the fixed plane with a preset gap remaining therebetween, the gap being the same as the height difference between the parallel plate and the middle flat plate.
5. The method for calibrating the high-precision machining base point of the 3D printing device according to claim 4, wherein the 3D printing device is provided with a scraper assembly, and the scraper assembly comprises the scraper, a pair of clamping plates mounted on the scraper, a fixing frame for fixing the clamping plates and an adjusting knob mounted on the fixing frame.
6. The method for calibrating a high-precision machining base point of a 3D printing device according to claim 5, wherein the scraper is made of plastic and has an inverted triangular prism structure, the scraper has a scraping part at a front end, a pair of opposite first grooves formed by inwards recessing two side faces of the scraper, and a pair of protruding first bosses formed by adjacent to the first grooves, the clamping plates have second protrusions clamped with the first grooves of the scraper and second grooves clamped with the first bosses, the two clamping plates are fixed together by a plurality of screws, the pair of clamping plates are attached to each other, the first grooves and the second protrusions are clamped with each other, and the first bosses and the second grooves are clamped with each other.
7. The calibration method for the high-precision machining base point of the 3D printing equipment according to claim 6, wherein the calibration method comprises the following steps: the fixing frame is provided with a notch formed by inwards sinking from one side surface of the fixing frame, a plurality of first adjusting grooves formed by inwards sinking from the other side surface of the fixing frame and communicated with the notch, and a second adjusting groove which is downwards sunk from the upper surface of the fixing frame and communicated with the notch; first adjustment tank is vertical extension's lengthwise structure, install first adjusting screw in the first adjustment tank, first adjusting screw's end with splint threaded connection each other, second adjusting screw is installed to the second adjustment tank, the end of second adjusting screw supports and leans on the upper surface of this pair of splint.
8. The method for calibrating a high-precision machining base point of a 3D printing device according to claim 7, wherein when the position of a scraper does not meet a preset requirement, the first adjusting screw and the second adjusting screw are adjusted to keep the scraper and a clamping plate at a reasonable position, the first adjusting screw and the second adjusting screw are installed at a preset installation position, and the first adjusting screw and the second adjusting screw are rotated by a preset torque to keep the scraper at the preset position.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010825176.6A CN112223746A (en) | 2020-08-17 | 2020-08-17 | Calibration method for high-precision processing base point of 3D printing equipment |
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| CN202010825176.6A CN112223746A (en) | 2020-08-17 | 2020-08-17 | Calibration method for high-precision processing base point of 3D printing equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114087986A (en) * | 2021-11-15 | 2022-02-25 | 北京德普润新材料科技有限公司 | Method for measuring laser focal plane of selective laser melting technology |
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| CN106182779A (en) * | 2016-08-25 | 2016-12-07 | 佛山市南海中南机械有限公司 | The focal plane correcting unit of a kind of 3D printer and bearing calibration thereof |
| CN207043340U (en) * | 2017-07-24 | 2018-02-27 | 长春德信光电技术有限公司 | Powdering precise control device for laser fast shaping equipment |
| CN210940474U (en) * | 2019-09-26 | 2020-07-07 | 成都雍熙聚材科技有限公司 | Adjustable composite flexible powder spreading device |
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2020
- 2020-08-17 CN CN202010825176.6A patent/CN112223746A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106182779A (en) * | 2016-08-25 | 2016-12-07 | 佛山市南海中南机械有限公司 | The focal plane correcting unit of a kind of 3D printer and bearing calibration thereof |
| CN207043340U (en) * | 2017-07-24 | 2018-02-27 | 长春德信光电技术有限公司 | Powdering precise control device for laser fast shaping equipment |
| CN210940474U (en) * | 2019-09-26 | 2020-07-07 | 成都雍熙聚材科技有限公司 | Adjustable composite flexible powder spreading device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114087986A (en) * | 2021-11-15 | 2022-02-25 | 北京德普润新材料科技有限公司 | Method for measuring laser focal plane of selective laser melting technology |
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