EP4204184A1 - Machine à détonation et procédé pour faire fonctionner une machine à détonation - Google Patents

Machine à détonation et procédé pour faire fonctionner une machine à détonation

Info

Publication number
EP4204184A1
EP4204184A1 EP21772685.0A EP21772685A EP4204184A1 EP 4204184 A1 EP4204184 A1 EP 4204184A1 EP 21772685 A EP21772685 A EP 21772685A EP 4204184 A1 EP4204184 A1 EP 4204184A1
Authority
EP
European Patent Office
Prior art keywords
process chamber
blasting
troughed belt
fan
blasting system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21772685.0A
Other languages
German (de)
English (en)
Inventor
Joscha INNECKEN
Maximilian SPES
Hansjörg Kauschke
Valentin GRABMAIER
Philipp Kramer
Julius Legenmajer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dyemansion GmbH
Original Assignee
Dyemansion GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dyemansion GmbH filed Critical Dyemansion GmbH
Publication of EP4204184A1 publication Critical patent/EP4204184A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/18—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions
    • B24C3/26—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions the work being supported by barrel cages, i.e. tumblers; Gimbal mountings therefor
    • B24C3/28—Apparatus using nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B24C7/0046—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
    • B24C9/003—Removing abrasive powder out of the blasting machine
    • 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
    • B29C64/264—Arrangements for irradiation
    • 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
    • B29C64/35—Cleaning
    • 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
    • B29C64/364—Conditioning of environment
    • 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
    • B33Y40/20—Post-treatment, e.g. curing, coating or polishing
    • 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

Definitions

  • the blasting system optionally includes at least one first fan, which is set up to suck substances out of the process chamber with a first suction power and a first volume flow, and at least one second fan, which is set up to suck substances out of the process chamber suck off with a second suction power and a second volume flow.
  • the one or more compressed air hoses can perform a chaotic movement in the process chamber. This allows cleaning to take place, for example. In addition, a powder cake could be unpacked.
  • the compressed air hoses are arranged in the trough of a troughed belt in the process chamber or are arranged in a basket if this accommodates the process components in the process chamber.
  • a sealing plate could be used to position manual interventions located in the sealing plate in front of the process chamber. This could be used, for example, in connection with a tumble belt blasting system, but optionally also, for example, in connection with a basket that is arranged in the blasting system.
  • the sealing plate could in particular interact with a lifting door, which can then rest on an upper edge of the sealing plate.
  • a lifting door which can then rest on an upper edge of the sealing plate.
  • Different techniques are conceivable for unloading the process components from the process chamber.
  • a carriage that has an unloading container can be used for this purpose.
  • the process parts could, for example, slide into the unloading container via a flap attached to the trolley.
  • a chute could also be formed on the blasting system, in which case the chute can be fixed, for example, or can be constructed to be foldable.
  • a basket or a troughed belt could also be moved out of a process chamber of the blasting system in order to unload the process parts.
  • blasting nozzles may be used to blast grit into the process chamber.
  • a corresponding mount can be provided for one or more jet nozzles.
  • This holder can be movably arranged inside the process chamber.
  • the jet nozzles can be positioned in relation to the trough.
  • a longitudinal movement along the direction of movement of the troughed belt would be conceivable, and/or a transverse movement.
  • An area in which the process components are arranged that is, for example, a trough of a troughed belt or a basket—can optionally be subdivided by one or more partitions according to various examples.
  • the partition walls can be detachably arranged within this area.
  • the area in which the process components are arranged can be reduced or enlarged as required.
  • the blasting machine can be operated in different operating modes. It is not necessary in all operating modes that blasting material is actually blasted into the process chamber.
  • the jet nozzles could be turned off.
  • the one or more jet nozzles are controlled differently.
  • Vibration drive could optionally be activated or deactivated depending on the operating mode. Compressed air could optionally be blown into the chamber depending on the operating mode.
  • a basket or a troughed belt can be driven differently depending on the operating mode.
  • the process chamber prefferably be cleaned between the operating modes, for example by blowing in compressed air, for example by using one or more compressed air hoses.
  • a fan module that cleans a filter of another fan module could also be operated between the operating modes.
  • an ionization bar it would be conceivable for an ionization bar to be arranged inside a process chamber of a blasting system. This could be surrounded by inert gas or air, for example.
  • 2A is a flowchart of an example method.
  • FIG. 2B illustrates a flap-controlled control of the outflow from a process chamber of the blasting system.
  • 2C illustrates a flap-controlled control of the outflow from a process chamber of the blasting system.
  • FIG 3 is a perspective view of an example implementation of a process chamber of a blast machine according to various examples.
  • FIG. 4 is a perspective view of an example implementation of a troughing module that includes a frame and a troughing belt mounted on the frame.
  • FIG. 5 illustrates details of the frame of the troughed belt module of FIG. 4.
  • 6 is a perspective view of the process chamber into which the troughed belt module is inserted. 6 also illustrates details of fans in the process chamber.
  • FIG. 7 is a perspective view of a lift gate capable of enclosing the processing chamber and moving to load the processing chamber, according to various examples.
  • 15 is a schematic view of the troughed belt according to various examples.
  • 16 is a perspective view of a holder for jet nozzles according to various examples.
  • the blasting system includes a housing in which a process chamber is arranged.
  • the process chamber can accommodate process components so that they can be treated with blasting material.
  • various of the techniques described herein are based on the knowledge that typically a number of plastic components to be processed, which are obtained by a powder bed method, is comparatively small, for example in particular in comparison to metallic components, which are produced by an injection molding method be obtained. If only small batches are blasted - as is often the case for plastic components - the relative consumption of process materials per process component, such as compressed air or blasting material, is high. Due to the possible variety of variants of the additively manufactured components, components with different geometries, shapes, sizes and weights are often processed together, which can also pose a challenge.
  • the techniques described herein can make it possible to handle the plastic components in a way that avoids damage to the plastic components or at least reduces rejects. Furthermore, according to the various examples described herein, it may also be possible to process comparatively limited batch sizes efficiently. This can affect both the loading process and the unloading process, as well as the blasting process itself, e.g. the consumption of process materials per process component
  • the efficient loading and unloading of the process chamber is described, particularly in the context of a troughed belt. Complex individual handling of the process components is avoided. It is avoided that process components have to cover a long fall distance, which could otherwise result in damage, especially for filigree plastic components. Using the techniques described herein, the loading process and the unloading process can be made particularly simple and reliable.
  • Fig. 1 illustrates aspects related to a blasting system 100.
  • the blasting system 100 includes a process chamber 110 in which process components 90 can be brought in.
  • the process components 90 are to be blasted with blasting material in order to treat their surfaces.
  • a blasting nozzle 111 is provided for this purpose, which is set up to blast the blasting material into the process chamber 110 . While only a single jet nozzle is shown in the example in FIG. 1 , it would generally be conceivable for more than one single jet nozzle to be used.
  • One or more such jet nozzles 111 can be attached to a corresponding holder.
  • the fixture can be moved relative to a housing of the process chamber 110 . This allows the jet nozzles 111 to be positioned with respect to the process components 90 . This allows the blasting process to be adjusted. Details on this are explained below in connection with FIG.
  • a compressed air source 113 is provided, which can press compressed air into the process chamber 110 via a corresponding outlet 112 . It is possible to attach an ionizer in front of or near the compressed air source 113. In this way, ionized air can be distributed in the process chamber 110 and the static charge can be reduced in this way.
  • more than one compressed air source 113 and/or more than one outlet 112 could be provided.
  • compressed air can be helpful when using a process for unpacking. Unpacking can be promoted by applying compressed air.
  • compressed air can be helpful for cleaning the process chamber 110 .
  • outlet 112 could be implemented as a compressed air hose.
  • FIG. 1 also shows that it would be conceivable in some variants to use a further outlet from the process chamber 110 in addition to the section 182 of the blasting material circuit 180, here in the form of the line 191.
  • the line 191 leads to a Collecting container 202 (instead of the collecting container 202 there can also be an interface to a powder conveyor or directly a powder feed pump, which then feeds into a third-party system (powder processing, etc.)).
  • line 191 or section 182 to be opened, for example depending on the operating mode of blasting system 100.
  • 2A is a flowchart of an example method.
  • the method could be performed by the control logic 160 of the shot blasting machine 100 of FIG.
  • the fan of the fan module 403 has a greater suction power than the fans of the fan modules 402, but can only suck in a lower volume flow of substances.
  • Suction power can denote the ability to create negative pressure.
  • the fan can also be characterized by a volume flow.
  • the fan of the fan module 403 can be designed as a side channel compressor, for example, and the fans of the fan module 402 can each be designed as a radial fan.
  • the fans of the fan module 402 can therefore be used to extract dust, in particular suspended dust, directly from the process chamber 110, which can be particularly helpful when the process chamber 110 is being loaded/unloaded and the door in front of the frontal opening of the process chamber 110 is open.
  • the troughed belt 410 is mounted on the frame arrangement 411 which has upper drive or deflection rollers 412 and a lower deflection roller 413 .
  • the troughed belt forms a trough 414 in the lower area in the vicinity of the lower deflection roller 413, in which the process components 90 can be arranged during the process.
  • the frame assembly 411 also includes side panels.
  • the grid size of the grid structure could be smaller than the particle size of the blasting material. Instead, the blasting material is sucked off by the fan module 403.
  • the fan module 403 could also have a filter. This filter could be cleaned by the fan module 402 in a cleaning mode by drawing in air.
  • FIG. 7 illustrates aspects related to a lift gate 421 .
  • the lift door 421 can be opened and closed for loading and unloading the process chamber 110 frontally.
  • the lift gate 421 can be moved along a rail 422 between a closed position and an open position.
  • the disc 425 then seals the process chamber 110 in the closed position.
  • the disc 425 can be made of a plastic, for example. Disc 425 could have an antistatic and/or scratch resistant coating.
  • a handle 423 is provided for a user.
  • FIG. 7 shows a lower edge 424 of the lifting door 421, which can be configured with a sealing lip, for example.
  • the lower edge 424 of the lifting door 421 can be in sealing contact with a sealing edge 429 of the housing 401 of the process chamber 110 (compare FIG. 3) when the lifting door 421 is in the closed position, so that the process chamber 110 is sealed off.
  • FIG. 8 illustrates aspects associated with the use of a hand grip 442.
  • the hand grip 442 is disposed in a sealing plate 441.
  • the sealing plate 441 is arranged next to the lift door 421, which is there in the closed position 431.
  • the sealing plate 441 is arranged in the area of the lifting door 421, which is in an intermediate position 432, i.e. between the closed position 431 and an open position (not shown in Fig. 8; in the open position, the lifting door 421 can be pushed further up).
  • the lower edge 424 of the lifting door 421 rests on an upper edge 443 of the sealing plate 441, so that the process chamber 110 is once again closed with a seal.
  • FIG. 8 illustrates aspects associated with the use of a hand grip 442.
  • guide rails 444 are provided, which extend transversely to the longitudinal direction of movement of the lifting door 421 (indicated by the horizontal double-headed arrow in FIG. 8).
  • the sealing plate 441 is movably (slidably) arranged in the guide rails 444 . This enables the hand grips 442 to be positioned very quickly. Compared to a hand grip permanently arranged in the wall of the process chamber, it is advantageous in this case that no dirt and powder can collect on the hand grip, for example in cavities of the hand grip or on gloves which are used frequently.
  • the corresponding displacement of the sealing plate 441 with the hand grips 443 is also shown in FIG.
  • sealing plate 441 it is possible that other techniques for positioning the sealing plate 441 can be used. For example, it would be conceivable for the sealing plate 441 to be positioned manually in the area of the lifting door 421 .
  • 10 illustrates aspects related to the troughed belt. 10 is a side perspective view of the process chamber in which the troughed belt 410 is placed. For the sake of simplicity, the lifting door 421 is not shown.
  • FIG. 10 shows that the housing 401 of the process chamber 110 has a flap 461 in the lower region of the process chamber 110 .
  • the sealing edge 429 of the housing 401 is arranged on the flap 461, which serves to form a seal with the lower edge 424 of the lifting door 421 when the latter is in the closed position 431 (cf. Fig. 8th; when using the sealing plate 441, the seal is made between the sealing edge 429 of the housing 401 and the bottom edge 433A of the sealing plate 441 (see Fig. 9).
  • the flap 461 can be folded out.
  • this can be done manually, or—as shown in FIG. 10—by an actuator 462, for example with an electric motor. It is then possible that components 90 that are arranged on the troughed belt 410 can slip out of the process chamber 110 via the folded-out flap 461, for example into a collection container. By using the flap 461 as a parts chute, the falling height of the parts 90 can be reduced, which avoids damage. For this purpose, the direction of movement of the troughed belt 410 can be reversed so that the parts are moved towards the front edge of the process chamber 110 .
  • a suitable trolley can be used for loading and unloading, as in connection with Figs. 11 and 12 described below.
  • FIGS. 11 and 12 illustrate a cart 700 that can be used to load and unload the shot blasting machine 100 .
  • Cart 700 has optional casters.
  • the carriage can be designed to be movable, but it is also possible for the carriage 700 to be permanently connected to the system.
  • a funnel-shaped chute 702 could also be taken in order to transport process components 90 safely from the trough 414 into the unloading container 703 .
  • wedges could be attached to the sides of the process space 110, which direct the parts to a defined width corresponding to the width of the unloading container 703.
  • a mechanism comprising paddles that can be swiveled away would also be conceivable, which guide the process components 90 away from the edges of the troughed belt 410 during unloading.
  • blasts of compressed air to center the parts within the trough 414 during unloading, by providing appropriate compressed air nozzles at the edges of the troughed belt 410.
  • the loading container 701 can be tilted, as shown in FIG. 12, in order to convey the process components 90 onto the troughed belt 410.
  • the width of the loading container 701 can be smaller than the width of the troughed belt 411 transversely to the direction of movement, so that the loading container 701 can be tilted into the process chamber 110 .
  • the loading container 701 is tipped in the same direction as the chute 702 is located, it would also be conceivable for the loading container 701 to be tipped onto the other side of the carriage 700 . This can be advantageous if dust is thrown up during tipping, which could soil the parts chute.
  • the carriage 700 it would be conceivable for the carriage 700 to have contact features (e.g. a snap lock) which releasably engage with corresponding contact features of the blasting system, e.g to secure the process chamber 110 during loading and/or unloading.
  • Such contact features may also be redundant to allow positioning of the carriage 700 in different positions relative to the blasting machine.
  • the trolley can also be used as part of a safety concept, so that the risk of injury by the user, for example from limbs that are pulled into the troughed belt, is avoided.
  • the troughed belt 410 is pivoted forward out of the operating position - in the direction of the maintenance position 782, into an intermediate position (not shown in Fig. 10 and Fig. 13) - so that a through the front Deflection roller 413 defined front edge of the troughed belt 410 is arranged in front of the sealing edge 429 of the housing 401, that is, protrudes from the process chamber 110.
  • the parts chute 702 of the carriage 700 or directly the unloading container 703 could be arranged below this front edge of the troughed belt 410 in order to enable the process components 90 to be unloaded in this way. In such a case, in particular, it may not be necessary to provide the flap 461 .
  • the troughed belt 410 can be removed particularly easily from the process chamber 110 together with the frame arrangement 411 when this is arranged in the maintenance position 782 (compare FIG. 13).
  • a locking mechanism 481, as shown in FIG. 14, can be provided for this purpose.
  • the locking mechanism is implemented via a locking cylinder.
  • the locking mechanism 481 is configured to selectively lock or unlock an engagement between the frame assembly 411 for the troughed belt 410 and the housing 401 of the process chamber 110 .
  • the engagement between the housing 401 and the frame assembly 411 can be unlocked.
  • the frame assembly 411 can then be removed from the process chamber 110 together with the troughed belt 410 .
  • the removal can take place in the direction of the front lifting door 421, which means that there is no opening in the housing 401 on the side of the process chamber 110 is required.
  • the process chamber 110 can then be particularly accessible and cleaning can be made possible.
  • the troughed belt module comprising the troughed belt 410 and the frame arrangement 411 can be quickly removed from the process chamber 110 .
  • FIG. 15 illustrates the troughed belt 410 schematically.
  • FIG. 15 is a top view of the troughed belt 410.
  • the direction of movement of the troughed belt 410 is oriented vertically in the plane of the drawing in FIG. 15, as indicated by the double-headed arrow.
  • the troughed belt can be made of an antistatic material (such as an acetal copolymer).
  • the electrostatic charge can be created by dissipating charge, i.e. by low ohmic resistance of the material, or by reducing friction.
  • the troughed belt 410 is made up of troughed belt segments 501-506 which are detachably connected to one another. For example, clip connections could be used.
  • the various troughed belt segments 501-506 each comprise webs 511-513 which are oriented perpendicularly to the direction of movement, ie protrude perpendicularly from a surface defined by the various segments 501-506.
  • the webs 511 - 513 can be attached to the surface of the troughed belt 410 in a detachable manner.
  • contact features can be provided on the surface of the troughed belt 410 and on a corresponding underside of the webs 511-513.
  • a detachable plug connection could be implemented using the contact features.
  • differently shaped elements can also be used, for example pins, cuboids or hemispheres.
  • the troughed belt can have properties that enable longevity, stabilize the process, are easy to clean and comply with the safety concept.
  • a durable material such as polyoxymethylene or an acrylonitrile butadiene styrene copolymer can be used for this purpose.
  • a polyoxymethylene, for example, in a natural color (usually white) can be used to minimize the impact of soiling from abrasion.
  • FIG. 15 shows that the various webs 511-513 are arranged on the troughed belt 410 in such a way that they cause the process components 90 to move perpendicularly to the direction of movement of the troughed belt 410 towards the sides of the troughed belt 410 .
  • This is achieved by the pyramidal arrangement of the ridges 511-513 (i.e. a process component is moved by the ridge 511 towards an edge of the troughed belt 410, then further to this edge by one of the ridges 512, etc.; this is shown in Fig. 15 represented by the dotted arrow).
  • the webs 511 -513 could, for example, also be arranged agonal to the direction of movement in order to promote a corresponding “left/right distribution” effect of the process components 90 within the process chamber 90 between the two sides 418 and 419 of the troughed belt 410 . Also, reciprocation of process components could be allowed from one side of the troughed belt to the other, or from the sides of the troughed belt to the center of the troughed belt and back.
  • the webs 511-513 can be variably attached to the troughed belt segments, it would also be conceivable in other examples for the webs 511-513 to be fixedly attached to the troughed belt segments; then a configuration of the webs 511-513 as shown in FIG. 15 could be achieved by suitable selection of the troughed belt segments with the fixed webs 511-513.
  • process components 90 can be irradiated particularly uniformly. Corresponding effects of a uniform irradiation of the process components 90 can also be achieved through the suitable implementation of jet nozzles. Techniques in this regard are discussed in FIG.
  • FIG. 16 illustrates aspects related to jet nozzles 611 , 612 .
  • Jet nozzles 611 , 612 may correspond to jet nozzle 111 (compare FIG. 1 ).
  • blasting system 110 may use one or more blasting nozzles.
  • FIG. 16 illustrates a holder 601 to which the jet nozzles 611 , 612 are attached.
  • the holder 601 is rod-shaped.
  • the holder 601 is arranged in the upper area of the process chamber (compare, for example, FIG. 10, where the jet nozzles 611, 612 are also shown).
  • the holder is movably arranged relative to the trough 411 formed by the troughed belt 410 .
  • the jet nozzles 611, 612 are positioned by manually moving the bracket 601 with respect to the trough 414, for example when the lift gate 421 is located in the open position.
  • an actuator 613 for example an electric motor, is provided, which can adjust the holder 601 automatically.
  • the control logic 160 (compare FIG. 1 ) is set up to control this actuator 613 in order to move the holder 601 .
  • a manual movement could also take place.
  • a lever outside of the process chamber 110 can be provided for this purpose, for example.
  • the mount 601 can be implemented. For example, it would be conceivable that an up-down movement is performed, i.e. towards or away from the trough 414 (illustrated in Figure 16 by the vertical dashed arrow). Alternatively or additionally, a left-right movement could also be performed, ie parallel to the trough 414 (illustrated by the horizontal dashed arrow in FIG. 16).
  • the jet nozzles 611-612 or the entire mount 601 also referred to as a jet bar
  • control logic 160 uses the control logic 160 to control the actuator 613 in order to move the holder 601 .
  • Some exemplary control variables are discussed below. As a general rule, multiple controls may be considered, or controls other than those listed below.
  • an “electric eel move” could be performed by fixture 601 .
  • Compressed air can then be used particularly efficiently for cleaning via the jet nozzles.
  • the holder 601 it would also be possible to position the holder 601 depending on the positioning of the frame arrangement 411 for the troughed belt 410. If, for example, the frame assembly 411 is folded out into the maintenance position (compare FIG. 13), it would be conceivable that the holder 601 is positioned far away from the bottom of the process chamber 110 so that the frame assembly 411 can be folded far up. In such examples it would therefore be conceivable that the control logic 160 is set up to control the actuator 613 so that it moves the holder 601 towards the trough 414 or away from the trough 414 . This can correspond to the up and down movement within the process chamber 110 . In addition to a control through an actuator and the control logic, a mechanical coupling of the troughed belt module and the holder 601 is also conceivable, which causes a joint movement when the troughed belt module is folded up.
  • a distance sensor (such as a TOF camera, an LIDAR sensor, an ultrasonic sensor, a stereo camera, etc.) could be provided for this purpose, for example, which determines a distance between the holder 601 and the process components 90 in the trough 414 .
  • control logic can be arranged to form a closed loop control to regulate this distance to a desired value by moving the support 601 towards the trough 414 or away from the trough 414 while the troughed belt 411 is moving.
  • a blasting process could also carry out a predefined movement of the holder 601 or steel nozzles 611-612.
  • Such a target value of the control loop can be defined statically or dynamically.
  • a static target value can remain constant during the blasting process, for example.
  • a dynamic target value that assumes different values during the blasting process.
  • the control logic 160 could therefore be set up to control the actuator 613 so that it moves the holder 601 transversely to the direction of movement of the troughed belt.
  • a separate actuator 614 could also be provided for this.
  • Such a transverse movement can also ensure that process components 90 arranged laterally in the trough 414 are reliably blasted.
  • a corresponding horizontal movement could be carried out periodically. In this way, the entire width of the troughed belt 410 can be covered during the blasting, even if the opening angles of the blasting nozzles 611, 612 are comparatively smaller.
  • a dividing wall could be provided, for example, which extends along the direction of movement of the troughed belt 410 and which is arranged in order to divide the process chamber 110 into two areas. For example, these areas can correspond to left and right.
  • the partition wall it would be conceivable for the partition wall to be arranged in a stationary manner in the process chamber 110 or for example to be attached to the troughed belt in the form of webs along the running direction of the troughed belt 410 .
  • the dividing wall can be attached, for example in a contact area with the troughed belt 410, flexible contact elements, for example bristles.
  • the control logic 160 can then be set up to in a corresponding mode of operation Actuator 613-614 to control, so that the movement of the holder 601 positioned transversely to the direction of movement of the one or more jet nozzles 611, 612 in one of the two areas that are formed by the partition.
  • the process chamber 110 By dividing the process chamber 110 into two parts by the dividing wall, it is possible to achieve that less consumable material, in particular compressed air, is required for the process control, in particular when comparatively few process components 90 are arranged in the process chamber 110 .
  • the jet nozzles 611, 612 can still be suitably positioned in either of the respective areas.
  • such a partition can also be used without having a left-right moveable mount 601 for the jet nozzles 611-612.
  • a left-right moveable mount 601 for the jet nozzles 611-612. it would be conceivable that only one of the two jet nozzles 611 , 612 is activated, depending on whether process components 90 are arranged in the left-hand part or in the right-hand part of the process chamber 110 .
  • FIG. 16 also illustrates that an ionization bar 671 is also attached to the holder 601—in addition to the jet nozzles 611-612.
  • the ionization bar 671 can be moved together with the jet nozzles 611-612 when the holder 601 is moved. While in the example in FIG. 16 the ionization bar 671 is attached together with the jet nozzles 611-612 by a single holder 601, it would be conceivable in other examples for the ionization bar 671 and the jet nozzles 611-612 to be attached to different holders, with these different brackets can also be moved separately.
  • blasting material When blasting process components, blasting material is conveyed onto components, for example by means of a carrier medium (eg air).
  • a carrier medium eg air
  • a turbine or centrifugal wheel could also be used.
  • the energy input will remove material from the component (especially when de-powdering plastic components additively manufactured using the powder bed process).
  • blasting material/ blasting material residues here summarized under dirt
  • material particles/powder from the component.
  • solid particles can explode under certain circumstances (so-called dust explosion). This is possible if the dust consists of combustible material and falls below a certain particle size, eg 0.5mm. Due to the correspondingly large surface, the dust particles can absorb heat well and oxidize quickly after ignition. Another decisive factor is the dusting behavior of bulk goods. An ignition spark in combination with a dust cloud must therefore be avoided in blasting systems.
  • Static charging is usually reduced by ionization, increasing the humidity, suitable material pairing or ESD passive dissipation of charges. In practice, you usually find a combination of the tools mentioned.
  • ionizers Free ions and electrons are generated which neutralize the charge by recombination. Active ionizers are often used in blasting systems, which generate an electrical field on pointed electrodes and thus the air in the area is ionized. The ionized air can then be accelerated onto the powder. In the worst case, the high voltage can ignite a cloud of dust. The blasting process and the blow-off process with ionized air are therefore often separated in time.
  • Zone 20 area in which an explosive atmosphere in the form of a cloud of combustible dust in air is present continuously, for a long time or frequently;
  • Zone 21 area in which it is to be expected that an explosive atmosphere in the form of a cloud of combustible dust in air will occasionally occur during normal operation.
  • the ionization bar 671 By using the ionization bar 671, it is possible to create a local flushing of the ionization with air or another protective gas.
  • the ionizing bar is implemented by a non-explosion-proof ionizing bar. This can be arranged in the process room 110 - for example with ATEX zone 20 - by flushing the partially enclosed rod continuously with clean and dust-free air; e.g. process exhaust air from the plant fan could be used. Instead of air, however, other gases are also possible, for example inert gas, e.g. nitrogen. In this way, a local reduction/avoidance of a potentially explosive zone can be achieved. This makes it possible to reduce restrictions in the choice of ionization. For example, it may be possible to use non-explosion proof ionization and use ionization during blasting or other process steps where dust is present.
  • FIG. 17 is a flowchart of an example method.
  • the method of FIG. 17 may be performed by control logic such as control logic 160 .
  • the method of FIG. 17 is used to operate multiple fans of a blasting system for plastic components that were produced, for example, by means of 3D printing.
  • box 3005 it is checked whether the blasting machine is currently being loaded. If the blasting system is currently being loaded, gas, in particular air, is sucked out of the process chamber in box 3010 (when the loading door is open). In addition, dust, in particular fine dust, is extracted.
  • a second fan can be controlled and operated, which is set up to suck off a particularly large volume flow.
  • a centrifugal fan could typically be used.
  • the radial fan can have a comparatively low suction power, for example in comparison to a side channel compressor. In this way it can be avoided that dust-like powder residues of the plastic components from the production process escape into the ambient air when loading the blasting system and cause pollution of the ambient air.
  • the system When the system is loaded, it can be checked in box 3015 whether the plastic components are blasted. For example, unpacking or depowdering could be done.
  • powder cake residues could be sucked off when unpacking.
  • the blasting agent and/or waste i.e. thermally contaminated powder, for example, can be extracted, for example in order to reuse the blasting agent. Powder cake residues could also be recovered when unpacking.
  • a correspondingly equipped first fan can be controlled and operated in order to suck off the blasting agent and/or the powder cake residues, for example a side channel blower, which has a comparatively high suction power and at the same time a small volume flow (compared to the second fan). Solids can be sucked off particularly well in this way.
  • the second fan can also be controlled in box 3020 in order to generate a negative pressure in the process chamber of the blasting system. Thereby prevents the particularly light plastic components from being pushed out of the process chamber when compressed air with blasting particles is blown into the blasting system during blasting.
  • a filter of the fan module of the first fan used in box 3020 which extracts solids, can be cleaned.
  • the second fan can be used for this.
  • the second fan may be connected to a cleaning port of the filter of the fan module of the first fan and then operated to clean a corresponding filter.
  • Example 1 Shot blasting machine (100) which includes:
  • Example 2 Jet system according to example 1, wherein the first fan (403) is designed as a side channel compressor and wherein the second fan (402) is designed as a radial fan.
  • Example 3 Blasting system (100) according to example 1 or 2, further comprising:
  • a trough belt (411) which is arranged in the process chamber (110) and which forms a trough (414), the second fan being optionally arranged in a side wall of the process chamber (110) next to the trough (414) or on a ceiling the process chamber (110) or in a rear wall of the process chamber (110).
  • a source of compressed air set up to apply compressed air to the compressed air hose so that it performs a chaotic movement in the process chamber.
  • Example 5 Shot blasting machine (100) which includes:
  • a lift door (421) which is arranged in front of the process chamber (110) and which can be moved along a longitudinal direction between a closed position and an open position, with a lower edge (424) of the lift door (421) in the closed position rests on a sealing edge of the housing (401), so that the process chamber (110) is closed in a sealing manner, and
  • a sealing plate (441) having an upper edge and a lower edge, wherein the sealing plate (441) can be releasably arranged such that the lower edge of the sealing plate (441) on the sealing edge (429) of the housing (401) rests and the bottom edge of the lift door (421) rests on the top edge of the sealing plate (441) when the lift door (421) is located in an intermediate position between the closed position and the open position such that the process chamber (110) is sealingly closed is, wherein in the sealing plate (441) one or more hand grips (442) are arranged.
  • Example 6 Blasting system (100) according to example 5, further comprising:
  • a guide rail (444) arranged in the housing (401) and extending transversely to the longitudinal direction of movement of the lifting door (421), the sealing plate (441) being movably arranged in the guide rail (444).
  • Example 7 Blasting system (100) according to example 5 or 6, wherein the sealing edge (429) of the housing (401) is formed on a flap (461) of the housing (401), which can be folded out when the lifting door (421) is not in the closed position, wherein the flap (461) is arranged with respect to the troughed belt (414) such that process components (90) from the trough (414) can slide over the flap (461).
  • Example 8 System that includes:
  • Example 9 Shot blasting machine (100) which includes:
  • a process chamber (110) which is formed in the housing (401), and - A frame arrangement (411) for a troughed belt (414), which has an upper deflection roller (412) and a lower deflection roller (413) and which is set up to guide a movement of the troughed belt (414).
  • Example 10 Blasting system (100) according to example 9, wherein the frame arrangement (411) is arranged pivotably between an operating position (781) and a maintenance position (782) about a pivot axis (471) arranged in the region of the upper deflection roller (412).
  • Example 11 Blasting system (100) according to example 10, further comprising:
  • Example 12 The blasting system (100) according to any one of examples 9 to 11, wherein the frame assembly (411) further comprises guide grooves which extend along a direction of movement of the troughed belt (414) in a region which is one formed by the troughed belt (414). Hollow (414) faces, and which are arranged to guide the troughed belt (414) in movement.
  • Example 13 Shot blasting machine (100) which includes:
  • troughing belt (414) which is arranged in the process chamber (110) and which forms a trough (414), and
  • holder (601) to which one or more jet nozzles (111, 611, 612) are attached, wherein the holder (601) is arranged to be movable relative to the trough (414).
  • Example 14 Blasting system (100) according to example 13, further comprising:
  • control logic (160) which is set up to control the actuator (614) to move the holder (601).
  • Example 15 Blasting system (100) according to example 14, wherein the control logic is set up to control the actuator so that it moves the holder transversely to a direction of movement of the troughed belt (414).
  • Example 16 Blasting system (100) according to any one of examples 13 to 15, wherein the control logic (160) is set up to control the actuator (614) so that it moves the holder (601) towards the trough (414) or away from the Hollow (414) moves.
  • Example 17 Shot blasting system (100) according to Example 16, further comprising:
  • control logic is arranged to form a control loop to determine the distance by movement of the fixture towards the trough (414) or away from the trough ( 414) to a desired value while the troughed belt (414) is moving.
  • Example 18 Shot blasting machine (100) which includes:
  • troughing belt (414) which is arranged in the process chamber (110) and which forms a trough (414), and - a partition extending along the direction of movement of the troughed belt (414) and arranged to divide the process chamber (110) into two areas.
  • Example 19 Method for operating a blasting system (100) having a process chamber (110) with a first outlet (191) and a second outlet (182), the method comprising:
  • the mode of operation is selected from: unpacking (3001) process components from a powder cake; depowdering (3002) process components; Compression of process components.
  • Example 20 The method according to example 19, wherein the second outlet (182) is connected to a closed blasting material circuit (180), wherein the first outlet (191) is not connected to the closed blasting material circuit (180).
  • Example 21 Troughed belt (410) for a blasting system (100), comprising:
  • troughed belt segments (501 -506) which can be connected to one another and which have contact features which are set up to engage corresponding contact features of webs (511 -513) in order to form a troughed belt with webs (511 -513 ) to train.
  • Example 22 Troughed belt (410) according to example 21, wherein the webs (511-513) are arranged such that a movement of process components (90) arranged in a trough (410) formed by the troughed belt (410) perpendicular to a direction of movement of the troughed belt (410).
  • Example 23 Shot blasting machine (100) which includes:
  • a gas source that is set up to flush the ionization bar (671) with air or an inert gas.
  • Example 24 Method for operating a blasting system (100), which comprises a process chamber (110), at least one first fan and at least one second fan, wherein the at least one first fan (403) is set up to remove substances from the process chamber (110) suck off with a first suction power and a first volume flow, and wherein the at least one second fan (402) is set up to suck the substances out of the process chamber (110) with a second suction power and a second volume flow, the method comprising:
  • fan modules for example the fan modules 402, 403, provide certain functionalities.
  • the fan module 402 can extract air and dust from the process chamber 110 .
  • the fan modules 402, 403 it would be possible for the fan modules 402, 403 to be variably configurable.
  • the fan of the fan module 402 could optionally be connected to the process chamber 110 through a corresponding opening in the process chamber 110, or to a collection container, for example a waste container (compare container 201 FIG. 1 ). Then a waste container could be sucked empty by operating the fan and all waste products collected in a central container.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
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Abstract

Divers exemples de l'invention concernent une machine à détonation ayant une chambre de traitement. Une bande de culbutage peut par exemple être disposée dans la chambre de traitement. Le document décrit des procédés de ventilation de la chambre de traitement. L'invention concerne également des procédés de fixation de la bande de culbutage. L'invention concerne également des procédés permettant de faire fonctionner des buses de détonation.
EP21772685.0A 2020-08-27 2021-08-26 Machine à détonation et procédé pour faire fonctionner une machine à détonation Pending EP4204184A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020122479.6A DE102020122479A1 (de) 2020-08-27 2020-08-27 Strahlanlage und Verfahren zum Betreiben einer Strahlanlage
PCT/EP2021/073595 WO2022043427A1 (fr) 2020-08-27 2021-08-26 Machine à détonation et procédé pour faire fonctionner une machine à détonation

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EP4204184A1 true EP4204184A1 (fr) 2023-07-05

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EP21772685.0A Pending EP4204184A1 (fr) 2020-08-27 2021-08-26 Machine à détonation et procédé pour faire fonctionner une machine à détonation

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US (1) US20230356359A1 (fr)
EP (1) EP4204184A1 (fr)
DE (1) DE102020122479A1 (fr)
WO (1) WO2022043427A1 (fr)

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Publication number Priority date Publication date Assignee Title
WO2024059749A2 (fr) * 2022-09-15 2024-03-21 Align Technology, Inc. Systèmes et procédés de modification de surfaces d'objets fabriqués de manière additive

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
US1567077A (en) * 1922-03-01 1925-12-29 Louis D Peik Tumbling mill
US3672292A (en) * 1970-09-22 1972-06-27 Vacu Blast Corp Blast-room for abrasive blasting system
CH601081A5 (fr) * 1976-07-20 1978-06-30 Werner Hunziker
US4239804A (en) * 1979-03-05 1980-12-16 Progressive Blasting Systems Method for treating metal articles for rust corrosion protection and article produced thereby
CN1072090C (zh) * 1993-11-15 2001-10-03 昭和炭酸株式会社 喷丸处理装置
DE19802308C2 (de) 1998-01-22 2001-05-31 Horst Laug Absaugvorrichtung für Sandstrahl- und Flüssigkeitsdruckdüsen
DE102014003997A1 (de) 2014-03-20 2015-09-24 Rippert Besitzgesellschaft Mbh & Co. Kg Schutzvorrichtung für eine Trockeneis-Strahlanlage und Trockeneis-Strahlanlage

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US20230356359A1 (en) 2023-11-09
DE102020122479A1 (de) 2022-03-03

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