Intermediate product, unclogging method, unclogging device, object to be cooled, and cooling method

Abstract

The application discloses a three-dimensional printing intermediate product, a dredging method, a dredging device, a to-be-cooled product and a cooling method. The intermediate product has a cooling pipe piece embedded in a first material body, the cooling pipe piece is provided with at least two port portions which are open to an upper surface and / or a side surface of the first material body, and a channel which is communicated with the port portions and is filled with a second material body. The dredging method and the dredging device are used for dredging the channel of the intermediate product and forming the to-be-cooled product. The cooling method accelerates the cooling speed of the to-be-cooled product by inputting cooling gas into the channel of the to-be-cooled product.

Description

Technical Field

[0001] The present application relates to the field of three-dimensional printing, and in particular to an intermediate product, a dredging method, a dredging device, an object to be cooled, and a cooling method. Background Art

[0002] In the prior art, a three-dimensional printing molding process is completed in a printing cavity that is open upward in a printing support. Specifically, a three-dimensional printing system includes a printing support, a three-dimensional printer, and a post-processing workstation. The printing support includes a shell, a support plate, and casters. The support plate is accommodated in the shell and moves in the up and down directions relative to the shell. The upper surface of the support plate and the inner surface of the shell together constitute an upward-opening printing cavity. The casters are used to realize the movement of the printing support. The printing support can also be provided with a printing material accommodating cavity and a powder lifting mechanism. The printing material accommodating cavity is used to accommodate printing materials, and the powder lifting mechanism lifts the printing materials for the three-dimensional printer to spread powder. A three-dimensional printer generally includes a printing information generation module and a layered printing execution module. The printing information generation module is configured to obtain shape information of a 3D printed part and, based on the shape information of the 3D printed part, generate layout information of the 3D printed part to be confirmed. After the layout information of the 3D printed part to be confirmed is confirmed, the module generates layered printing information based on the shape information and the layout information of the 3D printed part. The printing information generation module may also obtain modifications to the 3D printed part layout information from a user and generate layered printing information based on the shape information and the modified layout information of the 3D printed part. The layered printing execution module includes a controller and a printing device. After obtaining the layered printing information, the controller controls the printing device to layer powder and print in a printing chamber based on the layered printing information. The printing device includes a powder spreading mechanism and a printing mechanism. The powder spreading mechanism is configured to spread printing material lifted by the powder lifting mechanism into the printing chamber. The printing mechanism is configured to selectively shape specific areas of the surface of the printing material so that the printing material in the specific areas is sintered and connected. The printing mechanism includes an inkjet unit and a heating unit. The inkjet unit is configured to spray a sintering promoter on the specific areas, while the heating unit is configured to heat the printing material to sinter and form the printing material in the specific areas. After the printing device has applied powder layer by layer and completed printing, an intermediate product is formed in the printing chamber. The intermediate product includes a material body accommodated in the printing chamber and a three-dimensional printed part embedded in the material body. The printing support carries the intermediate product out of the three-dimensional printer and into a post-processing workstation. After the intermediate product is naturally cooled in the post-processing workstation, the printing material forming the material body is sucked away by a negative pressure device, and finally the three-dimensional printed part is removed from the material body. Some public technical documents also disclose a method in which a post-processing workstation is not set up, but the intermediate product is lifted from the printing chamber by raising the support plate, allowing it to cool naturally, and then the printing material forming the material body is sucked away by a negative pressure device. However, regardless of which of the above post-processing methods is used, the cooling time is very long, generally about three to five times the printing time of the three-dimensional printer, which becomes a key factor restricting the overall work efficiency of three-dimensional printing. Summary of the Invention

[0003] The purpose of this application is to overcome the above-mentioned defects or problems existing in the background technology, and to provide an intermediate product, a dredging method, a dredging device, an object to be cooled and a cooling method, which can accelerate the cooling rate of the intermediate product, or create material conditions for accelerating the cooling rate of the intermediate product.

[0004] In order to achieve the above objectives, the following technical solutions are adopted:

[0005] The first technical solution relates to an intermediate product, which is formed in an upwardly opening printing cavity of a three-dimensional printing support member, and comprises: a first material body, which is formed by a portion of unformed printing material, and the first material body is accommodated in the printing cavity when the intermediate product is formed; a three-dimensional printed member, which is formed by the printing material and buried in the first material body; a cooling duct member, which is formed by the printing material and buried in the first material body, and is provided with at least two openings opening on the upper surface and / or side surface of the first material body, and a channel connecting the openings; and a second material body, which is formed by a portion of the unformed printing material in the channel.

[0006] The second technical solution is based on the first technical solution, wherein at least one through hole is opened on the pipe wall of the cooling pipe member.

[0007] The third technical solution relates to a dredging method for dredging the channel of the intermediate product as described in the first technical solution; it uses a flexible suction tube to gradually extend into the channel from at least one of the mouths to suck away the printing material forming the second material body until each of the mouths forms a gas connection through the channel.

[0008] The fourth technical solution relates to a clearing device, which includes an air suction pump and a flexible air suction tube connected to the air suction pump; the air suction pump is used to suck air from the flexible air suction tube, and the flexible air suction tube is suitable for extending into the channel of the intermediate product described in the first or second technical solution to suck away the printing material forming the second material body.

[0009] The fifth technical solution is based on the fourth technical solution, which also includes an air pump and a flexible air pipe connected to the air pump; the air pump is used to supply air to the flexible air pipe, and the flexible air pipe at least close to its output end is located in the flexible intake pipe or is configured to be suitable for extending into the channel parallel to the flexible intake pipe.

[0010] The sixth technical solution is based on the fifth technical solution, wherein the air pump sends pulse gas to the flexible air supply pipe.

[0011] The seventh technical solution is based on the fourth technical solution, and further includes a thimble, which is fixed relative to the input end of the flexible intake pipe and extends out of the input end of the flexible intake pipe.

[0012] The eighth technical solution is based on the fourth technical solution, and further includes a vibrator and a vibrating needle. The vibrator is used to generate mechanical vibration. One end of the vibrating needle is connected to the vibrator, and the other end extends out of the input end of the flexible suction tube.

[0013] The ninth technical solution is based on any one of the technical solutions described in any one of the fourth to eighth technical solutions, and further includes a powder collector, which is connected in series with the suction pump and the flexible suction pipe to collect the printing material that forms the second material body.

[0014] The tenth technical solution relates to an object to be cooled, which includes: a first material body, which is formed by a portion of unmolded printed material; a three-dimensional printed part, which is molded from the printed material and buried in the first material body; and a cooling duct part, which is molded from the printed material and buried in the first material body, and is provided with at least two openings opening on the upper surface and / or side surface of the first material body, and a gas channel connecting each of the openings.

[0015] The eleventh technical solution is based on the tenth technical solution, wherein at least one through hole is opened in the pipe wall of the cooling pipe member.

[0016] The twelfth technical solution relates to a cooling method for cooling an object to be cooled as described in the tenth or eleventh technical solution, wherein cooling gas is input from at least one of the ports to the channel so that the cooling gas is output from the remaining ports through the channel.

[0017] The thirteenth technical solution is based on the twelfth technical solution, wherein the cooling gas is also recovered from the port that outputs the cooling gas.

[0018] The fourteenth technical solution is based on the twelfth or thirteenth technical solution, wherein the cooling process has at least a first flow rate stage in front and a second flow rate stage in the back, and the cooling gas flow rate in the second flow rate stage is greater than the cooling gas flow rate in the first flow rate stage.

[0019] The fifteenth technical solution is based on the twelfth or thirteenth technical solution, wherein the cooling process has at least a first temperature stage in front and a second temperature stage in the back, the input temperature of the cooling gas in the second temperature stage is lower than the input temperature of the cooling gas in the first temperature stage, and the input temperature of the cooling gas is the temperature of the cooling gas input from the mouth to the channel.

[0020] Compared with the prior art, the above solution has the following beneficial effects:

[0021] In the first technical solution, the cooling duct is embedded within the first material body and has at least two openings extending from the upper and / or side surfaces of the first material body, as well as a channel connecting the openings. After the second material body is cleared from the channel using the dredging method described in the second technical solution, the channel becomes gas-connected. When cooling gas is introduced into the channel, heat conduction is achieved within the intermediate product, accelerating the cooling rate. Therefore, the intermediate product in the first technical solution provides the material basis for accelerating the cooling rate.

[0022] In the first technical solution, the three-dimensional printed parts should be interpreted as not only one but also two or more; the cooling duct parts should be interpreted as not only one but also two or more; the shape of the cooling duct parts can be not only one but also two or more. Generally, as common knowledge, those skilled in the art know that as the final output of three-dimensional printing, any three-dimensional printed part should be separated from other three-dimensional printed parts and have a gap with the cavity wall (including the bottom cavity wall and the side cavity wall) of the printing cavity; and any cooling duct part should also be separated from other cooling duct parts and from any three-dimensional printed part. In the first technical solution, the opening of the mouth on the upper surface of the first material body should not only be interpreted as the mouth opening directly on the upper surface of the first material body, but also as the case where the printing material above the mouth is easy to remove even if there is a certain gap between the mouth and the upper surface of the first material body, which also falls under the situation where the mouth opens on the upper surface of the first material body. The easy removal can be interpreted as not only being removed manually but also being removed by negative pressure, but the easy removal is limited to not exposing any three-dimensional printed part. Similarly, the mouth opening on the side surface of the first material body should not only be interpreted as the mouth directly opening on the side surface of the first material body, but should also be interpreted as even if there is a certain distance between the mouth and the side surface of the first material body, the printing material on the side of the mouth is easy to be removed, which also belongs to the case where the mouth opens on the side cavity wall of the printing cavity.

[0023] In the second technical solution, through holes are opened on the pipe wall of the cooling pipe member, so that the cooling gas can directly contact the printing material during the cooling process, thereby improving the heat exchange efficiency and shortening the cooling time.

[0024] In the third technical solution, the flexible suction tube is adapted to extend into the channel to aspirate the printed material forming the second material body. This should be interpreted as the input end of the flexible suction tube being able to communicate with the atmosphere within the channel to facilitate aspiration of the printed material. This communication with the atmosphere can include forming a gap between the outer wall of the flexible suction tube and the inner wall of the channel. Alternatively, the flexible suction tube can form an airway between the flexible suction tube and the inner wall of the channel through its own shape, thereby communicating with the atmosphere. For example, if the flexible suction tube has a circular cross-section and the channel has a square cross-section, all four corners of the channel can communicate with the atmosphere. Alternatively, the method defined in the fourth technical solution can include supplying air to the input end of the flexible suction tube via an air pump, thereby also achieving the effect of aspirating the printed material. In the second technical solution, since the flexible suction tube can extend into the channel, it can aspirate the printed material forming the second material body in close proximity, resulting in faster dredging.

[0025] The technical effect of the fourth technical solution is the same as that of the third technical solution.

[0026] The flexible air supply tube in the fifth technical solution not only replenishes air to the input end of the flexible air intake tube but also acts on the surface of the second material, breaking up easily agglomerated printed material and thereby improving the efficiency of the flexible air intake tube in removing the printed material. The output end of the flexible air supply tube can be located inside the flexible air intake tube or outside the flexible air intake tube, extending into the passageway in parallel with the flexible air intake tube. Both ends can impact the surface of the second material. The output end of the flexible air supply tube should generally be located close to the input end of the flexible air intake tube to facilitate their coordinated operation and improve work efficiency.

[0027] In the sixth technical solution, the air pump delivers pulse gas, which is more conducive to breaking up the printing materials that are easy to agglomerate through pulse impact, thereby improving the dredging efficiency.

[0028] In the seventh technical solution, a pin is fixedly mounted at the input end of the flexible suction tube. The pin extends beyond the input end of the flexible suction tube. This fixation of the pin relative to the input end of the flexible suction tube means that during the dredging process, the pin continues to penetrate the channel along with the flexible suction tube. During the dredging process, the pin can pierce the second material in the channel and break it into small agglomerates or powder, thereby improving dredging efficiency. Of course, as those skilled in the art will readily appreciate, the pin needs to possess a certain degree of rigidity to resist bending and breaking. Even so, the pin's auxiliary structure is easy to configure and inexpensive.

[0029] The eighth technical solution also provides a vibrator and a vibrating needle. One end of the vibrating needle is connected to the vibrator, and the other end extends out of the input end of the flexible suction tube. Therefore, during the dredging process, the second material body in the channel can be broken by the vibrating needle using mechanical vibration to improve the dredging efficiency.

[0030] The ninth technical solution also includes a powder collector, which is well known to those skilled in the art. The powder collector is connected in series with the suction pump and the flexible suction tube to collect printed material from the second material body, enabling recycling of the printed material forming the second material body and saving costs. The powder collector can be connected in series with the suction pump and the flexible suction tube, or it can be connected in series between the suction pump and the flexible suction tube, or it can be connected in series to the output of the suction pump, or it can be connected in series to the flexible suction tube.

[0031] The object to be cooled in the tenth technical solution is the intermediate product in a dredged state. Since the passages are already connected to the gas, the object to be cooled can be directly cooled by inputting cooling gas.

[0032] The technical effect of the eleventh technical solution is the same as that of the second technical solution.

[0033] The twelfth technical solution achieves rapid cooling of the object to be cooled by transporting cooling gas into the channel to establish heat conduction inside the object to be cooled.

[0034] The thirteenth technical solution recycles the cooling gas, which is particularly beneficial when the input temperature of the cooling gas is higher than room temperature. By recycling the cooling gas above room temperature, energy consumption is saved and the ambient temperature is prevented from being too high.

[0035] The fourteenth technical solution increases the temperature of the cooling gas in the object to be cooled by setting a lower flow rate in the early stage of cooling, slows down the heat conduction efficiency, and avoids excessive deformation of the three-dimensional printed part. It can also take away heat faster by setting a higher flow rate in the later stage of cooling, thereby improving the cooling efficiency.

[0036] The fifteenth technical solution sets the cooling gas input temperature close to the actual temperature of the object being cooled during the early cooling phase, thereby slowing down heat transfer and preventing excessive deformation of the 3D printed part. In the later cooling phase, the cooling gas input temperature is lowered, further away from the actual temperature of the object being cooled. This improves cooling efficiency while minimizing deformation of the 3D printed part. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solution of the embodiment, the following briefly introduces the drawings required for use:

[0038] Figure 1 This is a schematic structural diagram of the printing support member in Example 1;

[0039] Figure 2 Schematic diagram of the structure of the 3D printer in Example 1;

[0040] Figure 3 This is a logical diagram of the printing method in Example 1;

[0041] Figure 4 Schematic diagram of the structure of the 3D printer in Example 1;

[0042] Figure 5 This is a schematic diagram of the structure of the intermediate product in Example 1;

[0043] Figure 6 This is a structural diagram of the post-processing workstation in Example 1;

[0044] Figure 7 Schematic diagram of the method for dredging the intermediate product in Example 1;

[0045] Figure 8 This is a schematic structural diagram of the object to be cooled in Example 1;

[0046] Figure 9 This is a schematic diagram of a method for cooling an object to be cooled in Example 1;

[0047] Figure 10 This is a logical diagram of the printing method in Example 2;

[0048] Figure 11 This is a schematic diagram of the structure of the intermediate product in Example 2;

[0049] Figure 12 This is a schematic structural diagram of the dredging device in Example 2;

[0050] Figure 13 Schematic diagram of the method for dredging the intermediate product in Example 2;

[0051] Figure 14 This is a schematic diagram of the structure of the object to be cooled in Example 2;

[0052] Figure 15 This is a schematic structural diagram of the cooling device in Example 2;

[0053] Figure 16 Schematic diagram of a method for cooling an object to be cooled in Example 2;

[0054] Figure 17 This is a logical diagram of the printing method in Example 3;

[0055] Figure 18 This is a schematic structural diagram of the dredging device in Example 3;

[0056] Figure 19 Schematic diagram of the method for dredging the intermediate product in Example 3;

[0057] Figure 20 This is a schematic diagram of the cooling device structure in Example 3;

[0058] Figure 21This is a schematic diagram of the structure of the intermediate product in Example 4;

[0059] Figure 22 Schematic diagram of the method for dredging the intermediate product in Example 4;

[0060] Figure 23 This is a schematic diagram of the structure of the object to be cooled in Example 4;

[0061] Figure 24 This is a schematic structural diagram of the cooling device in Example 4;

[0062] Figure 25 Schematic diagram of a method for cooling an object to be cooled in Example 4;

[0063] Figure 26 This is a schematic diagram of the structure of the intermediate product in Example 5;

[0064] Figure 27 This is a schematic diagram of the structure of the object to be cooled in Example 5.

[0065] Description of main reference numerals:

[0066] 1. 3D printing system; 2. Printing support member; 3. 3D printer; 4. Post-processing workstation; 5. Housing; 6. Support plate; 7. Drive member; 8. Casters; 9. Print chamber; 10. Frame; 11. Printing information generation module; 12. Layered printing execution module; 13. Accommodating chamber; 14. Memory; 15. Processor; 16. Human-computer interaction unit; 17. 3D printing computer program; 18. Controller; 19. Printing device; 20. Powder spreading mechanism; 21. Printing mechanism; 22. Inkjet unit; 23. Heating unit; 24. Intermediate product; 25. First material body; 2 6. Three-dimensional printed part; 27. Cooling pipe part; 28. Second material body; 29. ​​Mouth; 30. Channel; 31. Main body; 32. Clearing device; 33. Cooling device; 34. Suction pipe; 35. Accommodating chamber; 36. Air suction pump; 37. Flexible air suction pipe; 38. Object to be cooled; 39. Air pump; 40. Air pipe; 41. Recovery part; 42. Air pump; 43. Flexible air pipe; 44. Powder collector; 45. Flow rate regulator; 46. Vibrator; 47. Vibrating needle; 48. Ejector pin; 49. Heater; 50. Temperature controller; 51. Tube wall; 52. Through hole. DETAILED DESCRIPTION

[0067] In the claims and the description, unless otherwise defined, the terms "first", "second" or "third", etc. are intended to distinguish different objects rather than to describe a specific order.

[0068] In the claims and the specification, unless otherwise specified, the terms "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships are based on the directions and positional relationships shown in the accompanying drawings and are only for the convenience of simplifying the description, and do not imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction.

[0069] In the claims and description, unless otherwise specified, the term "fixed connection" or "fixed connection" should be understood in a broad sense, that is, any connection method in which there is no displacement relationship or relative rotation relationship between the two parties, that is, including non-detachable fixed connection, detachable fixed connection, integral connection, and fixed connection through other devices or elements.

[0070] In the claims and the description, unless otherwise defined, the terms "include", "have" and their variations mean "including but not limited to".

[0071] The technical solutions in the embodiments will be described clearly and completely below with reference to the accompanying drawings.

[0072] Example 1

[0073] The first embodiment discloses a three-dimensional printing system 1 , which includes a printing support 2 , a three-dimensional printer 3 , and a post-processing workstation 4 .

[0074] Print support 2 as Figure 1 As shown, it includes a shell 5, a support plate 6, a drive member 7 and casters 8. The support plate 6 is accommodated in the shell 5 and is driven by the drive member 7 to move in the up and down directions relative to the shell 5. The upper surface of the support plate 6 and the inner surface of the shell 5 together form an upwardly open printing cavity 9. The printing cavity 9 is the printing working area of ​​3D printing. During the 3D printing process, as each layer is printed, the support plate 6 descends layer by layer, and the depth of the printing cavity 9 gradually increases until the printing is completed, as shown in FIG. Figure 5 As shown, an intermediate product 24 is formed in the printing chamber 9. The casters 8 are used to realize the movement of the printing support 2, and the printing support 2 can be moved to cooperate with the three-dimensional printer 3 (such as Figure 4 As shown), the three-dimensional printer 3 is used to print in the printing chamber 9. After the printing is completed, the printing support 2 can be Figure 5 As shown, the intermediate product 24 is matched with the post-processing workstation 4 (as shown Figure 6) for the post-processing workstation 4 to post-process the intermediate product 24. In the prior art, the print support 2 is also used to accommodate powder as the printing material; in the prior art, the print support 2 is also provided with a powder lifting mechanism (not shown in the figure, which is the prior art) to lift the printing material to a level suitable for use by the 3D printer 3. However, since the technical problem solved and the technical solution provided by this application do not involve this aspect, the powder lifting mechanism is not shown in the drawings of the specification of this application.

[0075] 3D printer 3 Figure 2 As shown, a frame 10 , a printing information generating module 11 and a layered printing executing module 12 are provided.

[0076] The frame 10 serves as a carrier for each module of the 3D printer 3. Figure 4 As shown, a receiving cavity 13 is provided, which is used to receive the printing support 2 so that the printing support 2 can cooperate with the 3D printer 3 .

[0077] like Figure 2 As shown, the printing information generation module 11 includes a memory 14, a processor 15 and a human-computer interaction unit 16. The memory 14 stores a 3D printing computer program 17, and the processor 15 is adapted to call the 3D printing computer program 17 from the memory 14 to implement the 3D printing method, that is, to generate layered printing information. Figure 4 As shown, it is used to realize human-computer interaction, generally including display, keyboard and mouse, etc. The three-dimensional printing method of generating layered printing information is as follows Figure 3 As shown, the following steps are included:

[0078] Step S11: Obtaining shape information of the 3D printed part from the human-computer interaction unit 16; the 3D printed part 26 is the final output of the 3D printing, and its shape can be one or more than one. Regardless of the number of shapes of the 3D printed part 26, the shape information of all types of 3D printed parts should be obtained from the human-computer interaction unit 16;

[0079] Step S12: Generate arrangement information of the 3D printed parts, shape information of the cooling duct parts, and arrangement information of the cooling duct parts, and form the to-be-printed information together with the shape information of the 3D printed parts. The arrangement information of the 3D printed parts refers to the position information of the 3D printed parts 26 in the printing cavity 9 when there is only one 3D printed part 26, and refers to the position information of all 3D printed parts 26 in the printing cavity 9 when there are two or more 3D printed parts 26. Specifically, in the first embodiment, step S12 includes the following sub-steps:

[0080] Sub-step S12.1: Generate and output the information to be confirmed from the human-computer interaction unit 16 to the user, the information to be confirmed includes the arrangement information of the three-dimensional printed part to be confirmed, the shape information of the cooling duct part to be confirmed and the arrangement information of the cooling duct part to be confirmed; the shape information of the cooling duct part to be confirmed should ensure that the cooling duct part 27 has at least two openings 29, and a channel 30 connecting the openings 29; the arrangement information of the cooling duct part to be confirmed should ensure that the cooling duct part 27 and the three-dimensional printed part 26 are separated from each other and that the opening 29 opens to the side cavity wall of the printing cavity 9 and / or the top layer of printing material; wherein, the arrangement information of the cooling duct part to be confirmed refers to when there is only one cooling duct part. When the cooling duct part 27 is displayed, it is the position information of the cooling duct part 27 in the printing cavity 9, and when the number of cooling duct parts 27 is more than two, it is the position information of each cooling duct part 27 in the printing cavity 9; generally, those skilled in the art know as common knowledge that the three-dimensional printed part 26 is the final output of three-dimensional printing, and any three-dimensional printed part 26 should be separated from other three-dimensional printed parts 26 and have a gap with the cavity wall (including the bottom cavity wall and the side cavity wall) of the printing cavity 9; and any cooling duct part 27 should also be separated from other cooling duct parts 27 and separated from any three-dimensional printed part 26; the top layer of printing material refers to the material after the three-dimensional printing is completed, such as Figure 5As shown, the printing material located on the upper surface of the first material body 25, the mouth 29 opens to the uppermost layer of printing material, which not only means that the mouth 29 of the cooling duct member 27 in the printed intermediate product 24 directly opens to the upper surface of the first material body 25, but also means that even if there is a certain distance between the mouth 29 and the upper surface of the first material body 25, the printing material above the mouth 29 is easy to be removed, which also belongs to the case where the mouth 29 opens to the uppermost layer of printing material, wherein easy to be removed not only means that it can be removed manually, but also means that it can be removed by negative pressure, but easy to be removed is limited to not exposing any three-dimensional printed part 26; similarly, the mouth 29 opens to the side wall of the printing cavity 9 , not only refers to the fact that the opening 29 of the cooling duct member 27 in the printed intermediate product 24 directly opens onto the side surface of the first material body 25, but also refers to the fact that even if there is a certain distance between the opening 29 and the side surface of the first material body 25, the printed material on the side of the opening 29 is easily removed, which also falls under the situation where the opening opens onto the side wall of the printing cavity. It should be noted that for existing 3D printers, if the shape information of the cooling duct member to be confirmed is already given, generating the arrangement information of the 3D printed part to be confirmed and the arrangement information of the cooling duct member to be confirmed is an existing technology, because the cooling duct member can be regarded as a special type of 3D printed part. Generating the shape information of the cooling duct member to be confirmed can be easily solved by presetting a selectable cooling duct member model or even a presetting and determined cooling duct member shape. With the development of artificial intelligence technology, other fields now already have the technology to automatically generate specific shapes in space and automatically arrange them, and it is easy to introduce these technologies into this field.

[0081] Sub-step S12.2: Obtaining feedback on the information to be confirmed from the human-computer interaction unit 16;

[0082] Sub-step S12.3: Determine whether the information to be confirmed is confirmed. If so, generate the information to be printed based on the shape information of the 3D printed part and the information to be confirmed, and proceed to step 13. If not, proceed to sub-step S12.4.

[0083] Sub-step S12.4: Acquire modification information from the human-computer interaction unit 16, the modification information including the modified arrangement information of the 3D printed component, the modified shape information of the cooling duct component, and the modified arrangement information of the cooling duct component;

[0084] Sub-step S12.5: Determine whether the modified information meets the requirements. If the modified shape of the cooling duct meets the requirements that the cooling duct 27 has at least two openings 29 and a passage 30 connecting the openings 29, and the modified arrangement of the cooling duct meets the requirements that the openings 29 open to the side walls of the printing chamber 9 and / or the topmost layer of printing material, then generate the to-be-printed information based on the shape of the 3D printed part and the modified information, and proceed to step 13. Otherwise, execute sub-step S2.6.

[0085] Sub-step S12.6: Report an error through the human-computer interaction unit 16 and execute sub-step 12.4;

[0086] Step S13: Generate layered printing information based on the information to be printed and output it to the layered printing execution module 12 .

[0087] like Figure 2 As shown, the layered printing execution module 12 includes a controller 18 and a printing device 19. The controller 18 obtains the layered printing information output by the printing information generation module 11, and controls the printing device 19 to spread powder layer by layer in the printing chamber 9 and print based on the layered printing information. The printing device 19 includes a powder spreading mechanism 20 and a printing mechanism 21, and the printing mechanism 21 includes an inkjet unit 22 and a heating unit 23. Figure 4 As shown, the printing device 19 is mounted on the frame 10 and can slide back and forth relative to the frame 10 in the powder spreading direction. The powder spreading mechanism 20 is generally a powder spreading roller, which is used to spread the printing material raised by the powder lifting mechanism into the printing chamber 9. The printing mechanism 21 is used to selectively shape specific areas of the surface of the printing material so that the printing material in the specific area is sintered and connected. The inkjet unit 22 is used to spray a sintering agent in the specific area, and the heating unit 23 is used to heat the printing material to sinter the printing material in the specific area.

[0088] After the printing device 19 is completed under the control of the controller 18, the following is formed in the printing chamber 9: Figure 5The intermediate product 24 shown. In this embodiment, the intermediate product 24 is transferred to the post-processing workstation 4 through the printing support 2 for post-processing. During the entire process, the intermediate product 24 is always contained in the printing chamber 9. In this embodiment, the intermediate product 24 includes a first material body 25, a plurality of three-dimensional printed parts 26, a cooling duct part 27, and a second material body 28. The first material body 25 is formed by a portion of unformed printing material, and the first material body 25 is contained in the printing chamber 9 when the intermediate product 24 is formed. The three-dimensional printed part 26, as the final output of three-dimensional printing, is formed from the printing material and embedded in the first material body 25. Generally, any three-dimensional printed part 26 should be separated from other three-dimensional printed parts 26 and should be spaced apart from the cavity wall (including the bottom cavity wall and the side cavity wall) of the printing cavity 9. The cooling duct part 27 is formed from the printing material and embedded in the first material body 25. The cooling duct member 27 is provided with at least two openings 29 opening on the upper surface and / or side surface of the first material body 25, and a channel 30 connecting the openings 29. In this embodiment, the cooling duct member 27 is provided with two openings 29 opening on the upper surface of the first material body 25, and the channel 30 is roughly U-shaped.

[0089] The intermediate product 24 is post-processed in the post-processing workstation 4. The post-processing method generally includes three steps:

[0090] Step S21: sucking the printed material forming the second material body 28 to clear the channel 30 of the intermediate product 24 so that the channel 30 is gas-connected;

[0091] Step S22: inputting cooling gas into the channel 30 from at least one opening 29 opened on the upper surface of the first material body 25, and outputting the cooling gas from the remaining openings 29; and

[0092] Step S23: The printed material forming the first material body 25 is sucked to remove the three-dimensional printed part 26. The cooling duct part 27 is allowed to be removed or broken in this step.

[0093] The following describes in detail the method for post-processing the intermediate product 24 in conjunction with the structure of the post-processing workstation 4.

[0094] like Figure 6 As shown, the post-processing workstation 4 includes a main body 31, a clearing device 32, a cooling device 33 and a suction pipe 34.

[0095] The main body 31 is used to carry the dredging device 32, the cooling device 33, and the suction pipe 34. The main body 31 is provided with a receiving cavity 35 for accommodating the printing support 2. The main body 31 is generally also provided with a glass cover to prevent dust. Since it is not related to the technical problem to be solved by this application and the corresponding technical solution, it will not be described here.

[0096] like Figure 6 As shown, the dredging device 32 includes an air suction pump 36 and a flexible air suction tube 37. The air suction pump 36 is used to suck air from the flexible air suction tube 37, and the flexible air suction tube 37 is suitable for extending into the channel 30 to suck away the printing material forming the second material body 28.

[0097] Specifically, if Figure 7 As shown, a flexible suction tube 37 is gradually extended from one of the openings 29 into the channel 30 to aspirate the printed material forming the second material body 28 until the openings 29 are in gas communication through the channel 30. The flexible suction tube 37 extending into the channel 30 to aspirate the printed material forming the second material body 28 specifically means that the input end of the flexible suction tube 37 is able to communicate with the atmosphere to facilitate the aspiration of the printed material. In this embodiment, a gap is formed between the outer wall of the flexible suction tube 37 and the inner wall of the channel 30. In other embodiments, the flexible suction tube 37 can also form an airway connected to the atmosphere through its own shape and the inner wall of the channel 30. For example, if the cross-section of the flexible suction tube 37 is circular and the cross-section of the channel 30 is square, then all four corners of the channel can communicate with the atmosphere.

[0098] After the channel 30 of the intermediate product 24 is unblocked, a Figure 8 The object to be cooled 38 is shown. The difference between the object to be cooled 38 and the intermediate product 24 is that the second material body 28 in the channel 30 is removed, so that the openings 29 are in gas communication through the channel 30. In this embodiment, the object to be cooled 38 is also accommodated in the printing cavity 9.

[0099] like Figure 6 As shown, in this embodiment, the cooling device 33 for cooling the object 38 includes an air pump 39 and an air pipe 40. The air pump 39 is configured to deliver cooling gas at a high flow rate to the air pipe 40. In this embodiment, the cooling gas is room temperature air. The air pipe 40 is adapted to interface with at least one opening 29 on the upper surface of the first material body 25 to deliver the cooling gas to the already gas-connected channel 30, thereby establishing a gas flow within the channel 30. In other embodiments, to establish a gas flow within the channel 30, the air pipe 40 may be interfaced with an air suction pump 36 or a separate air extraction pump. This allows air suction to create a gas flow within the channel 30, thereby accelerating the cooling of the 3D printed part 26. The air pipe 40 may interface with the opening 29 by extending from the opening 29 into the channel, by being fitted onto the opening 29 after removing the printed material from the opening 29, or by directly forming threads on the opening 29 through 3D printing, thereby allowing the joint of the air pipe 40 to interface with the opening 29 through threads. Generally, the connection between the gas pipe 40 and the mouth 29 may be airtight or non-airtight.

[0100] Specifically, if Figure 9As shown, the cooling method in this embodiment uses a gas pipe 40 of a cooling device 33 to supply cooling gas from one opening 29 into a channel 30, so that the cooling gas is discharged from the remaining openings through the channel 30. Because the channel 30 runs through the interior of the first material body 25, the flowing cooling gas removes heat, thereby accelerating the cooling of the 3D printed part 26.

[0101] like Figure 6 As shown, after cooling is completed, the suction tube 34 is connected to the suction pump 36 to suck the printing material to form the first material body 25. Since the suction tube 34 is used to suck the printing material to form the first material body 25, the inner diameter of the input end of the suction tube 34 is generally larger than the inner diameter of the flexible suction tube 37. The suction tube 34 can be connected to the suction pump 36 by removing the flexible suction tube 37 and then connecting it to the suction pump 36, or by connecting it to the other input end of the suction pump 36, or directly connecting to the flexible suction tube 37. In some cases, the suction tube 34 may simply be a connector suitable for connecting to the flexible suction tube 37, as long as it can improve the efficiency of sucking the printing material. In other embodiments, another suction pump can also be provided to specifically connect to the suction tube 34.

[0102] After the first material body 25 is removed, the three-dimensional printed part 26 can be taken out. In this process, the cooling pipe part 27 can be taken out or directly broken.

[0103] This embodiment introduces flowing cooling gas through the channel of the cooling pipe member 27 buried in the first material body 25, thereby taking away the heat inside the object to be cooled 38 more quickly, which can increase the cooling speed of the three-dimensional printed part 26, is conducive to improving production efficiency, and solves the pain point of low efficiency in three-dimensional printing.

[0104] In this embodiment, the layout information of the 3D printed part to be confirmed, the shape information of the cooling duct part to be confirmed, and the layout information of the cooling duct part to be confirmed are automatically generated and then need to be confirmed or modified by the user. This improves work efficiency, facilitates user use, and allows the user to modify the 3D printed part 26 according to the specific situation, thereby better meeting actual work needs.

[0105] Example 2

[0106] The difference between the second embodiment and the first embodiment is that:

[0107] 1. Different methods of generating information to be printed

[0108] like Figure 10As shown, in the second embodiment, based on the shape information of the 3D printed part obtained from the human-computer interaction unit 16, the processor 15 in this embodiment directly generates the layout information of the 3D printed part, the shape information of the cooling duct components, and the layout information of the cooling duct components when running the 3D printing computer program 17. Without human intervention, the to-be-printed information is generated together with the shape information of the 3D printed part. This approach is more efficient because it does not require human intervention, but it is less flexible.

[0109] 2. The structure of intermediate 24 is different

[0110] like Figure 11 As shown, in the second embodiment, the intermediate product 24 includes two cooling pipe members 27 , each cooling pipe member 27 is provided with an opening 29 opening on the upper surface of the first material body 25 and an opening 29 opening on the side surface of the first material body 25 .

[0111] 3. The dredging device 32 and the dredging method are different

[0112] like Figure 12 As shown, in the second embodiment, the dredging device 32 includes an air suction pump 36, two flexible air suction pipes 37, an air supply pump 42, two flexible air supply pipes 43 and a powder collector 44. Among them, the two flexible air suction pipes 37 are connected to the input end of the air suction pump 36, the two flexible air supply pipes 43 are connected to the output end of the air supply pump 42, and the powder collector 44 is connected in series to the flexible air suction pipes 37. The air supply pump 42 is used to deliver gas to the flexible air supply pipes 43 and is allowed to be time-division multiplexed with the air delivery pump 39. The so-called time-division multiplexing means that the air supply pump 42 and the air delivery pump 39 are allowed to share a pump. In the dredging stage, the pump is used as the air supply pump 42, and in the cooling stage, the pump is used as the air delivery pump 39. In this embodiment, the air supply pump 42 can choose to deliver pulse gas, which has a stronger impact effect on the surface of the second material body 28.

[0113] like Figure 13 As shown, the output end of one flexible air supply tube 43 is located within the flexible air suction tube 37. Inserting the flexible air suction tube 37 into the channel 30 aspirates the printing material forming the second material body 28. Another flexible air supply tube 43 extends into the channel 30 in parallel with the flexible air suction tube 37, also aspirating the printing material forming the second material body 28. In this embodiment, the output end of the flexible air supply tube 43 is close to the input end of the flexible air suction tube 37, facilitating their coordinated operation and improving work efficiency.

[0114] The dredging device 32 and dredging method of this embodiment can impact the surface of the second material body 28, making it easier to break up the printing material that is prone to agglomeration, thereby making it easier to improve the efficiency of the flexible suction pipe 37 in sucking away the printing material.

[0115] In this embodiment, by using the powder collector 44 , the printing material used to form the second material body 28 can be recycled, thereby saving costs.

[0116] 4. The structure of the object to be cooled 38 is different

[0117] like Figure 14 As shown, in this embodiment, because the structure of the intermediate product 24 is different, the structure of the object to be cooled 38 in this embodiment is also different from that of the object to be cooled 38 in the first embodiment. The specific difference is that the object to be cooled 38 includes two cooling duct members 27, each of which has an opening 29 opening on the upper surface of the first material body 25 and an opening 29 opening on the side surface of the first material body 25.

[0118] 5. Different cooling devices 33 and cooling methods

[0119] like Figure 15 As shown, the cooling device 33 in this embodiment includes an air pump 39, two air pipes 40, a recovery unit 41, and two flow rate regulators 45. The two air pipes 40 are connected to the output end of the air pump 39, the recovery unit 41 is connected to the input end of the air pump 39, and the two flow rate regulators 45 are connected in series to the two air pipes 40. Of course, in other embodiments, the flow rate regulators 45 can also be provided on the air pump 39.

[0120] like Figure 16 As shown, the recovery part 41 is covered on the opening of the printing cavity 9 and is used to recover the cooling gas from the mouth 29 that is not connected to the gas pipe 40. Specifically, the cooling gas output from the mouth 29 that is not connected to the gas pipe 40 (the mouth 29 that opens on the side surface of the first material body 25) will impact the printing material forming the first material body 25 located on the side surface, thereby forming a gap between the side cavity wall of the printing cavity 9 and the object to be cooled 38. The cooling gas enters the recovery part 41 covered on the opening of the printing cavity 9 from the gap and is recirculated to the gas pump 39. The two gas pipes 40 respectively pass through the recovery part 41 and connect with the mouths 29 of the two cooling pipe parts 27 that open on the upper surface of the first material body 25. The flow rate regulator 45 is used to adjust the flow rate of the cooling gas in the gas pipe 40. In this embodiment, the flow rate of the cooling gas is low in the early stage of cooling, and high in the later stage of cooling. In this embodiment, the recovery member 41 forms a seal with the housing 5 when it covers the opening of the printing chamber 9, and the air supply pipe 40 also forms a seal with the recovery member 41 when it passes through the recovery member 41. The sealing structure belongs to the prior art and will not be described in detail here.

[0121] In this embodiment, a lower flow rate is set in the early stage of cooling to increase the temperature of the cooling gas in the object to be cooled 38, thereby slowing down the heat conduction efficiency and avoiding excessive deformation of the three-dimensional printed part 26. A higher flow rate can also be set in the later stage of cooling to quickly remove heat and improve cooling efficiency.

[0122] This embodiment recycles the cooling gas, which is particularly beneficial when the input temperature of the cooling gas is higher than room temperature. By recycling the cooling gas above room temperature, energy consumption is saved and excessively high ambient temperature is also avoided.

[0123] This embodiment can also introduce flowing cooling gas through the channel of the cooling pipe member 27 buried in the first material body 25, so as to more quickly remove the internal heat of the object to be cooled 38, thereby increasing the cooling speed of the three-dimensional printed part 26, which is beneficial to improving production efficiency and solving the pain point of low efficiency of three-dimensional printing.

[0124] Example 3

[0125] The difference between the third embodiment and the second embodiment is that:

[0126] 1. Different methods of generating information to be printed

[0127] like Figure 17 As shown, in Example 3, all information to be printed, including the shape information of the 3D printed part, the layout information of the 3D printed part, and the shape information and layout information of the cooling duct parts, is obtained from the user through the human-computer interaction unit, and layered printing information is output based on the information to be printed. This is conducive to handling various working conditions, but the efficiency is lower than that of Example 2.

[0128] 2. The dredging device 32 and the dredging method are different

[0129] like Figure 18 As shown in FIG. 1 , in this embodiment, the dredging device 32 includes an air pump 36, two flexible air pipes 37, a vibrator 46, a vibrating needle 47, a top needle 48, and a powder collector 44. The two flexible air pipes 37 are connected to the input end of the air pump 36. The powder collector 44 is connected in series to the output end of the air pump 36. The vibrator 46 is used to generate mechanical vibrations. One end of the vibrating needle 47 is connected to the vibrator 46, and the other end is connected to the vibrator 46. Figure 19 As shown, a flexible suction pipe 37 is extended from the input end. Figure 19 As shown, the ejector pin 48 is fixed relative to the input end of the other flexible suction tube 37 and extends out of the input end of the flexible suction tube 37 .

[0130] The user forcefully inserts one of the flexible suction tubes 37 into the channel 30 , and the ejector pin 48 can continue to penetrate deeper into the channel 30 along with the flexible suction tube 37 . During the dredging process, the second material body 28 in the channel 30 can be pierced by the ejector pin 48 and broken into small agglomerates or powder, thereby improving the dredging efficiency.

[0131] The user extends another flexible suction tube 37 into the channel 30 . During the dredging process, the second material body 28 in the channel 30 can be broken by the vibrating needle 47 through mechanical vibration, thereby improving the dredging efficiency.

[0132] In this embodiment, by using the powder collector 44 , the printing material used to form the second material body 28 can be recycled, thereby saving costs.

[0133] 3. Different cooling devices 33 and cooling methods

[0134] like Figure 20 As shown, the cooling device 33 in this embodiment includes an air pump 39, two air pipes 40, a recovery unit 41, two heaters 49, and a temperature controller 50. The two air pipes 40, as in the second embodiment, are used to connect with the two openings 29 on the upper surface of the first material body 25 and output cooling gas to the corresponding channels 30. The heater 49 is provided on the air pipe 40, and of course, it can also be provided in the air pump 39 in other embodiments. The heater 49 is used to heat the cooling gas in the corresponding air pipe 40. The temperature controller 50 is used to collect the input temperature of the cooling gas and control the heater 49.

[0135] It should be noted that the colder the cooling gas, the better. Especially in the initial stages of cooling, excessively low cooling gas temperatures can easily cause unacceptable deformation or even cracking of the three-dimensional printed part 26. This is readily understood by those skilled in the art. Therefore, in the initial stages of cooling, the cooling gas temperature is often adjusted to above room temperature to prevent unacceptable deformation or cracking of the three-dimensional printed part 26 due to excessive cooling or excessive temperature gradients. In this embodiment, the input temperature of the cooling gas is adjusted to be close to the actual temperature of the object to be cooled in the early stages of cooling, thereby slowing down the heat conduction efficiency and preventing excessive deformation of the three-dimensional printed part 26. In the later stages of cooling, the input temperature of the cooling gas is lowered and distanced from the actual temperature of the object to be cooled 38, thereby improving cooling efficiency without causing excessive deformation of the three-dimensional printed part 26.

[0136] This embodiment can also introduce flowing cooling gas through the channel of the cooling pipe member 27 buried in the first material body 25, so as to more quickly remove the internal heat of the object to be cooled 38, thereby increasing the cooling speed of the three-dimensional printed part 26, which is beneficial to improving production efficiency and solving the pain point of low efficiency of three-dimensional printing.

[0137] Example 4

[0138] The fourth embodiment differs from the first embodiment in that:

[0139] 1. The structures of the intermediate product 24 and the object to be cooled 38 are different

[0140] like Figure 21 As shown in FIG. 1 , in this embodiment, the cooling pipe member 27 of the intermediate product 24 is provided with two openings 29 opened on the side surface of the first material body 25. Figure 23 As shown, in this embodiment, the object to be cooled 38 is different from that in the first embodiment in that the cooling pipe member 27 of the intermediate product 24 is provided with two openings 29 opened on the side surface of the first material body 25 .

[0141] 2. The relationship between the intermediate product 24 and the printing support 2 is different

[0142] In this embodiment, Figure 21 As shown, although the intermediate product 24 is formed in the printing support 2, after printing is completed, the driving member 7 of the printing support 2 lifts the support plate 6 and moves the intermediate product 24 out of the printing chamber 9. Figure 23 As shown, the object to be cooled 38 in this embodiment is also located outside the printing chamber 9 .

[0143] Since the intermediate product 24 is removed from the printing chamber 9 after printing is completed, the heat dissipation area is larger, which is more conducive to cooling the three-dimensional printed part 26.

[0144] 3. The structure of 3D printing system 1 is different

[0145] The three-dimensional printing system 1 in this embodiment does not have a post-processing workstation 4, but is further provided with a dredging device 32 and a cooling device 33.

[0146] 4. Different dredging methods

[0147] The dredging device 32 has the same structure as the dredging device 32 in the first embodiment, but the dredging method is slightly different. Figure 22 As shown, the flexible suction tube 37 extends from a mouth 29 into the channel 30 to suck away the printing material forming the second material body 28, thereby forming a Figure 23 The object to be cooled 38 is shown, and the passage 30 is now in gas communication.

[0148] 5. Different cooling devices and cooling methods

[0149] like Figure 24 and Figure 25As shown, the cooling device 33 is further equipped with a recovery component 41 compared to the cooling device 33 in Example 1. The recovery component 41 is connected to the input end of the gas pump 39 and is suitable for docking with the outlet 29 for outputting the cooling gas, so that the cooling gas can be recovered from the outlet 29 for outputting the cooling gas.

[0150] This embodiment can also introduce flowing cooling gas through the channel 30 of the cooling pipe member 27 buried in the first material body 25, thereby taking away the internal heat of the object to be cooled 38 more quickly, which can increase the cooling speed of the three-dimensional printed part 26, is conducive to improving production efficiency, and solves the pain point of low efficiency of three-dimensional printing.

[0151] Example 5

[0152] The difference between the fifth embodiment and the first embodiment lies in the different structures of the intermediate product 24 and the object to be cooled 38 .

[0153] like Figure 26 As shown, in this embodiment, the pipe wall 51 of the cooling pipe member 27 of the intermediate product 24 is provided with at least one through hole 52, specifically, in this embodiment, the number of through holes 52 is three. Figure 27 As shown, in this embodiment, the object to be cooled 38 is different from the object to be cooled 38 in the first embodiment in that the pipe wall 51 of the cooling pipe member 27 of the intermediate product 24 is provided with at least one through hole 52 .

[0154] A through hole 52 is formed on the pipe wall 51 of the cooling pipe member 27, so that the cooling gas can directly contact the printing material during the cooling process, thereby improving the heat exchange efficiency and shortening the cooling time.

[0155] The above description of the specification and embodiments is used to explain the scope of protection of the present application, but does not constitute a limitation on the scope of protection of the present application.

Claims

1. An intermediate product (24) formed in an upwardly opening printing cavity (9) of a printing support (2), characterized in that: include: a first material body (25) formed from a portion of unformed printing material, the first material body (25) being accommodated in the printing cavity (9) when the intermediate product (24) is formed; a three-dimensional printed part (26), which is formed from a printing material and embedded in the first material body (25); a cooling duct member (27), which is formed from a printed material and embedded in the first material body (25), and is provided with at least two openings (29) opening on the upper surface and / or side surface of the first material body (25), and a channel (30) communicating with the openings (29); and A second material body (28) is formed in the channel (30) by a portion of unformed printing material.

2. The intermediate product (24) according to claim 1, characterized in that The pipe wall (51) of the cooling pipe member (27) is provided with at least one through hole (52).

3. A method for unclogging a channel (30) of an intermediate product (24) as claimed in claim 1 or 2; wherein: The printing material forming the second material body (28) is sucked away by a flexible suction tube (37) which gradually extends from at least one of the mouths (29) into the channel (30) until each of the mouths (29) forms a gas connection through the channel (30).

4. A dredging device (32), characterized in that: The invention comprises an air suction pump (36) and a flexible air suction pipe (37) connected to the air suction pump (36); the air suction pump (36) is used to suck air from the flexible air suction pipe (37), and the flexible air suction pipe (37) is suitable for extending into The channel (30) of the intermediate product (24) according to claim 1 or 2 is used to suck away the printing material forming the second material body (28).

5. The dredging device (32) according to claim 4, characterized in that: It also includes an air supply pump (42) and a flexible air supply pipe (43) connected to the air supply pump (42); the air supply pump (42) is used to supply air to the flexible air supply pipe (43); at least a portion of the flexible air supply pipe (43) close to its output end is located in the flexible air intake pipe (37) or is configured to be suitable for extending into the channel (30) in parallel with the flexible air intake pipe (37).

6. The dredging device (32) according to claim 5, characterized in that: The air supply pump (42) delivers pulsed gas to the flexible air supply pipe (43).

7. The dredging device (32) according to claim 4, characterized in that: It also includes a thimble (48), which is fixed relative to the input end of the flexible suction pipe (37) and extends out of the input end of the flexible suction pipe (37).

8. The dredging device (32) according to claim 4, characterized in that: It also includes a vibrator (46) and a vibrating needle (47), wherein the vibrator (46) is used to generate mechanical vibration, and one end of the vibrating needle (47) is connected to the vibrator (46), and the other end extends out of the input end of the flexible suction tube (37).

9. The dredging device (32) according to any one of claims 4 to 8, characterized in that: It also includes a powder collector (44), which is connected in series with the suction pump (36) and the flexible suction pipe (37) and is used to collect the printing material that forms the second material body (28).

10. An object to be cooled (38), characterized in that: include: A first material body (25) formed by a portion of unformed printed material; a three-dimensional printed part (26), which is formed from a printing material and embedded in the first material body (25); and A cooling duct member (27) is formed from a printed material and embedded in the first material body (25), and is provided with at least two openings (29) opening on the upper surface and / or side surface of the first material body (25), and a gas channel (30) connecting the openings (29).

11. The object to be cooled (38) according to claim 10, characterized in that: The pipe wall (51) of the cooling pipe member (27) is provided with at least one through hole (52).

12. A cooling method for cooling the object to be cooled (38) according to claim 10 or 11, characterized in that: Cooling gas is input from at least one of the ports (29) to the passage (30), so that the cooling gas is output from the remaining ports (29) through the passage (30).

13. The cooling method according to claim 12, wherein: The cooling gas is also recovered from the port (29) for outputting the cooling gas.

14. The cooling method according to claim 12 or 13, wherein: The cooling process has at least a first flow rate stage and a second flow rate stage, wherein the cooling gas flow rate in the second flow rate stage is greater than the cooling gas flow rate in the first flow rate stage.

15. The cooling method according to claim 12 or 13, wherein: The cooling process has at least a first temperature stage in front and a second temperature stage in the back, the input temperature of the cooling gas in the second temperature stage is lower than the input temperature of the cooling gas in the first temperature stage, and the input temperature of the cooling gas is the temperature of the cooling gas input from the mouth (29) to the channel (30).

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