WO2003086726A1 - Verfahren und vorrichtung zum auftragen von fluiden - Google Patents
Verfahren und vorrichtung zum auftragen von fluiden Download PDFInfo
- Publication number
- WO2003086726A1 WO2003086726A1 PCT/DE2003/001148 DE0301148W WO03086726A1 WO 2003086726 A1 WO2003086726 A1 WO 2003086726A1 DE 0301148 W DE0301148 W DE 0301148W WO 03086726 A1 WO03086726 A1 WO 03086726A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- blade
- area
- container
- coated
- fluid
- Prior art date
Links
Classifications
-
- 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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/36—Feeding the material on to the mould, core or other substrate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
-
- 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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/12—Spreading-out the material on a substrate, e.g. on the surface of a liquid
-
- 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
- B29C64/307—Handling of material to be used in additive manufacturing
- B29C64/343—Metering
-
- 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
- B33Y80/00—Products made by additive manufacturing
Definitions
- the present invention relates to a method and a device for applying fluids according to the preamble of independent claims 1 and 7. Furthermore, the invention also relates to the use of such a device.
- German patent application DE 198 53 834 a rapid prototyping method for building cast models is known from German patent application DE 198 53 834.
- untreated particle material is applied to a construction platform in a thin layer.
- a binder is sprayed onto the entire particle material in as fine a distribution as possible.
- a hardener is then dosed onto selected areas, thereby solidifying desired areas of the particle material. After repeating this process several times, an individually shaped body can be provided from the bound particle material.
- a casting mold can be produced with the aid of a sulfurous acid as hardening material, which mold is made from materials that are usually used in mold production and are therefore known to those skilled in the art consists.
- EP 0 538 244 ' B1 discloses a method for applying a layer of powder to an area, powder material being supplied to the area, a roller being moved over the area and the roller being rotated over the area in the opposite direction of its linear movement , The powder material is contacted by the roller rotating in the opposite direction, so that after the area is rolled over with the roller, a layer of powder material is formed on the area.
- the coating step is carried out in such a way that no significant shear stress is transferred to layers previously applied to the area and the shape is not destroyed, which was also generated in such previously applied layers.
- Fluids are described on an area to be coated, the fluid being applied to the area to be coated in front of a blade, viewed in the direction of advance of the blade, and the blade is then moved over the applied fluid, the blade carrying out an oscillation of the type Rotary motion.
- the blade swings in a certain sequence around a point above the point of contact of the blade on the surface.
- the movement itself is only a few degrees, the amplitude in the direction of travel of the blade is between 0.5 and 1.5 millimeters for the given lever ratio at the point of contact of the blade.
- the blades which vibrate vertically or in the manner of a rotary movement, the blade pushes a supply of particulate material in front of it during the coating run, which stock must be sufficient to coat the surface.
- the compression of the layer depends on the amount of particles in front of the blade. This means that at the start of the coating run, higher densifications can occur in the powder bed than at the end of the coating run when the powder supply has already been used up significantly. This difference in compression manifests itself, for example, in a wave of displacement in the powder bed already present at the start of the coater run and thus in the destruction of the already printed structure. Countermeasures can be taken here if the powder actually required is significantly less than the total amount in front of the blade.
- a further disadvantage is that the free particle material in front of the blade moves on the already printed level and on the one hand can impair the printed image of the last layer or comes into contact with the printed hardener of the last layer when used in rapid prototyping, which leads to undesired hardening effects in undefined areas.
- the unguided amount of particles on the coating blade leads to the particles also flowing off in the direction of the blade's longitudinal axis. Without a lateral boundary, a kind of wall made of particulate material would thus arise on the lateral boundary. However, a wall at the edge of the building site level cannot be accepted, since the printer is guided over it at a short distance from the surface to be printed and would inevitably come into contact with it.
- this object is achieved with a method for applying fluids of the type mentioned at the outset, the fluid being supplied from a container which is open at the bottom and oscillates with the blade.
- the vibration takes place in the manner of a rotary movement. This enables a strong reduction in the shear forces on the fluid surface and a higher compression.
- the vibration takes place essentially perpendicular to the area to be coated, that is to say in a vertical direction.
- This method can preferably be carried out with a device for applying fluids to an area to be coated, wherein a blade and, viewed in the forward direction of movement of the blade, a metering device is provided, by means of which fluid is applied to the area to be coated and the blade is above the applied fluid is moved and attached in such a way that it can carry out an oscillation.
- the metering device is designed as a type of container which is open at the bottom and contains the particle material and oscillates with the blade.
- the device is preferably provided such that the container is connected to the blade.
- the container is essentially designed as a funnel.
- a kind of funnel open at the bottom is hung in front of the coater blade, which is rigidly connected to the blade and thus resonates with it.
- the funnel carries the particulate material precursor along for at least one coater run over the entire length of the construction site.
- the funnel's swing mechanism is actuated, the particle material in the funnel is fluidized and flows out of the funnel, which is open at the bottom, in front of the blade.
- the particulate material remains in the funnel if the gap that defines the funnel opening is set accordingly.
- the hopper can therefore carry a much larger amount of material than is necessary for the current layer.
- a possible overfilling or the sinking of the supply in the funnel could preferably be monitored via a fill level sensor and, if necessary, the funnel can be filled from a supply container.
- the funnel can be made relatively simple. For example, a plate corresponding to the length of the coater can be fastened in front of the coater blade in such a way that a funnel is created.
- Decisive for the function of the device according to the invention are the setting of the gap width B g at the funnel exit and the height of the funnel plate above the contact surface of the coater blade H.
- the height H is determined as the resulting gap between the bottom edge of the funnel plate and the contact point the coating blade in relation to the zero position of, for example, the rotating or only vibrating system.
- H in the embodiment in which the blade only swings in the vertical, that is to say perpendicular, direction to the region to be coated is not a very critical size, since the blade no longer plunges into the previous layer due to the rotational movement.
- the funnel angle should be between 15 and 30 degrees, depending on which particle material is used.
- the following preferably applies to the dimensioning of the gap width B s :
- H s is the layer height and p s is the bulk density achieved
- the particle flow M ⁇ is dependent on the three variables vibration frequency, gap width B s and the height H.
- the increase in the parameters mentioned leads to an increased particle flow M ⁇ .
- a gap width B s that is selected too large mainly causes a higher material pressure on the last layer and thus a higher compaction of the sand with all its undesirable side effects.
- the height H should be selected using the following considerations:
- the entire structure of the coating blade and the funnel plate moves during the oscillation movement "in the manner of a rotary movement" not only in the direction of travel but also vertically.
- the fulcrum of the arrangement is chosen so that a definite stroke on the underside of the oscillating blade results- This stroke enables the controlled compression of the particle bed.
- the stroke must be matched to the particle material.
- Different particle materials have different compaction potential. Materials with a low bulk density measured by the density of the base material can be more densely compressed due to the low packing density (compare density of quartz 2.5 kg / 1 and bulk density of quartz sand 1.4 kg / 1). Depending on the material properties, a larger stroke of the blade can be set, measured by the layer thickness. This means that more particulate material can be transported under the blade and compressed by the return stroke.
- the funnel plate lies in front of the blade and therefore carries out an even greater pitching movement in this embodiment.
- the low point of the movement and thus the distance of the funnel plate H from the underside of the coater blade must be set so that the funnel plate does not touch the previous layer.
- the oscillating blade is preferably driven via eccentrics, which are attached to the drive motor shaft in a rotationally fixed manner.
- the power transmission from the eccentric to the oscillating blade can, for example, be positive, that is to say by direct application of a rolling bearing to the eccentric, or by means of non-positive transmission a spring loaded roller on the eccentric.
- the device according to the invention is particularly suitable for use in applying particulate material provided with a binder, and in particular in a process for building molds.
- the device according to the invention can preferably be used in a coating process with particle material which tends to agglomerate.
- Figure A shows the sequence of the method according to the invention.
- FIG. B shows the device according to the invention according to a first preferred embodiment.
- Figure C shows the device according to the invention according to a second preferred embodiment.
- the method according to the invention and the device according to the invention for use in the layered construction of cast models from particle material, binder and hardener in a rapid prototyping method are to be explained by way of example below.
- the use of such a particle material has the advantage that the step of coating the particle material with binder, which is usually necessary in the rapid prototyping process, is omitted, and the model can thus be built up more quickly and more cost-effectively.
- particle materials with a smaller grain size of less than 20 ⁇ m and also wax powder tend to agglomerate, so that the method according to the invention is also particularly advantageous for fluids.
- a construction method which is described with reference to FIG. A, of a component, such as a cast model, a construction platform 4, on which the casting mold is to be built, is lowered by a layer thickness of the particle material 5.
- particle material 5 for example quartz sand, which according to a preferred embodiment is provided with 1% by weight of binder (for example Capaset 0401 from Wilsontenes, Albertus), is applied to the building platform 4 in a desired layer thickness from a container, here a funnel 3 - wear.
- binder for example Capaset 0401 from Wilsontenes, Albertus
- the coater 1 is in the starting position, which is shown in Figure AI. It is initially filled via a filling device 2 when the level sensor has detected a low level in a container, which is designed here as a funnel 3.
- the building platform 4 is lowered by more than one layer in order to build a model.
- the coater 1 moves into the position opposite the filling device 2 without an oscillating movement and thus without a conveying action, until it stands above the edge of the building platform 4.
- the building platform 4 is raised exactly to the level of the layer, which can be seen from FIG. A4. This means that the construction platform 4 is now lowered exactly by one layer height,
- the coater-1 begins to oscillate and travels at a constant speed over the building platform 4. It releases particulate material 5 in exactly the right amount and coats the building platform 4. This is shown in FIG. A5.
- the coater 1 is then back in the starting position and can be refilled if necessary using the filling device (2). This is shown in Figure A6, which corresponds to Figure AI.
- the hopper 3 can be emptied over the waste container 6 by oscillating the hopper 3 in the state after a certain time and then filled again.
- the printing process or exposure process for hardening the particle material 1 provided with binder can take place during or after the coating.
- FIG. B shows a device according to the invention according to a preferred embodiment.
- a device is also suitable for carrying out the method according to the invention for applying particulate material 5 to an area to be coated, wherein a blade 7, viewed in the direction of forward movement 16 of the blade 7, has a metering device by means of which the construction platform is applied 4 Particle material 5 is applied and the blade 1 is moved over the construction platform 4.
- the blade 7 is attached to the main coater 10 in such a way that it can carry out an oscillation in the manner of a rotary movement.
- the main coater 10 extends here over the entire width of the construction platform 4 and travels over the entire construction platform 4.
- the axis of rotation 9 of the blade 7 is therefore, according to this preferred embodiment shown, perpendicular to the travel movement represented by the arrow 16 and parallel to the longitudinal axis of the blade 7.
- the metering device is a funnel 3, which is formed by a corresponding plate 17 which is fastened in front of the blade 7 by means of spacers.
- the plate 17 is arranged such that the gap width
- Hs the layer height
- p s the bulk density of the particle material achieved after coating
- M ⁇ a particle flow from the funnel 3
- M s is the necessary particle flow for the selected coating speed V B.
- the distance ⁇ of the sheet 17 of the funnel 3 from the underside of the blade 7 is as small as possible in accordance with the embodiment shown and is set such that the sheet does not touch the previous layer.
- the entire structure consisting of blade 7 and funnel 3 moves not only in the direction of travel, which is indicated by the arrow 16, but also vertically during the oscillating movement.
- the oscillation movement is indicated by arrow 8.
- the fulcrum 9 of the arrangement of the blade 7 is selected such that, as described in more detail above, there is a definite stroke in the direction of the arrow 8 on the underside of the blade.
- the blade is attached in such a way that the rotary movement of the blade takes place about an axis of rotation 9, which, viewed in the direction in the direction of construction of the particle material 5, lies above the area to be coated and is attached in such a way that the rotary movement is in the range of an angle of rotation of 0. 1 to 5 degrees.
- the particle material 5 can be fed into the funnel 3 from the filling device 2 in any conceivable manner known to the person skilled in the art. It would therefore be conceivable that, for example, a conveyor belt is used to supply it from a reservoir.
- the device is also designed in such a way that the blade 1 is driven by at least one high-speed electric motor which causes the blade 7 to oscillate via an eccentric 12.
- the motor used to drive the eccentric 12 has, for example, a nominal speed at 12 V of 3000 rpm, the stroke of the eccentric is 0.54 mm, which corresponds to an amplitude at the blade tip of 0.85 mm according to the example described , A speed of 4050 rpm was measured at 15 V. This value corresponds to 67.5 Hz. te of the blade 7, it may be necessary to provide several articulation points.
- the blade also has rounded edges 13, so that the inlet for particulate material 5 is formed by a radius which is formed on an edge of the blade 1.
- This can. can be achieved, for example, by slightly breaking the edges or, as already described, can be achieved by designing the edges as radii, preferably in the range from 2 to 4 mm.
- the blade 1 is constructed from two parts, a shaped blade body 14 and a holder 15, the blade body can be unscrewed and also exchanged if, for example, the blade body 14 is damaged.
- FIG. C shows a further preferred embodiment of the invention.
- the essential difference from the embodiment shown in FIG. B is that the vibration of the
- Blade 7 and the container 3 not in the manner of a rotary movement, but in the vertical direction.
- Vertical here means essentially perpendicular to construction platform 4.
- the oscillating movement is represented by arrow 8. Otherwise, the elements shown with the same reference numerals correspond to those shown in FIG.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Coating Apparatus (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003240385A AU2003240385A1 (en) | 2002-04-11 | 2003-04-08 | Method and device for applying fluids |
DE10391476T DE10391476D2 (de) | 2002-04-11 | 2003-04-08 | Verfahren und Vorrichtung zum Auftragen von Fluiden |
EP03729817A EP1494841B1 (de) | 2002-04-11 | 2003-04-08 | Verfahren und vorrichtung zum auftragen von fluiden |
US10/510,543 US7748971B2 (en) | 2002-04-11 | 2003-04-08 | Method and device for applying fluids |
JP2003583715A JP4445755B2 (ja) | 2002-04-11 | 2003-04-08 | 流体を塗布するための方法および装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10216013.9 | 2002-04-11 | ||
DE10216013A DE10216013B4 (de) | 2002-04-11 | 2002-04-11 | Verfahren und Vorrichtung zum Auftragen von Fluiden |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003086726A1 true WO2003086726A1 (de) | 2003-10-23 |
Family
ID=28684954
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2003/001148 WO2003086726A1 (de) | 2002-04-11 | 2003-04-08 | Verfahren und vorrichtung zum auftragen von fluiden |
Country Status (6)
Country | Link |
---|---|
US (1) | US7748971B2 (de) |
EP (1) | EP1494841B1 (de) |
JP (1) | JP4445755B2 (de) |
AU (1) | AU2003240385A1 (de) |
DE (2) | DE10216013B4 (de) |
WO (1) | WO2003086726A1 (de) |
Cited By (19)
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WO2005080010A1 (de) * | 2004-02-19 | 2005-09-01 | Voxeljet Gmbh | Verfahren und vorrichtung zum auftragen von fluiden |
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US7676298B2 (en) | 2005-06-08 | 2010-03-09 | Crc For Advanced Composite Structures Limited | Method and apparatus for surface shaping of polymer composite components |
US7748971B2 (en) | 2002-04-11 | 2010-07-06 | Voxeljet Technology Gmbh | Method and device for applying fluids |
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US8506870B2 (en) | 2003-06-16 | 2013-08-13 | Voxeljet Technology Gmbh | Methods of manufacturing layered three-dimensional forms |
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Also Published As
Publication number | Publication date |
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JP2005522322A (ja) | 2005-07-28 |
DE10391476D2 (de) | 2005-03-03 |
US20060105102A1 (en) | 2006-05-18 |
EP1494841A1 (de) | 2005-01-12 |
DE10216013B4 (de) | 2006-12-28 |
JP4445755B2 (ja) | 2010-04-07 |
US7748971B2 (en) | 2010-07-06 |
EP1494841B1 (de) | 2013-01-02 |
DE10216013A1 (de) | 2003-10-30 |
AU2003240385A1 (en) | 2003-10-27 |
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