Additive composite manufacturing forming cavity device and forming method for long pipe parts

Abstract

The invention discloses an additive composite manufacturing forming cavity device and method for long pipe parts. The device comprises a box body, a base plate is arranged at the top in the box body and connected with the top of a clamp guide rail body, the clamp guide rail body is connected with an air bag clamp, and the left side and the right side of the air bag clamp are connected with a first lead screw stepping motor and a second lead screw stepping motor through a first connecting rod and a second connecting rod; the first lead screw stepping motor and the second lead screw stepping motor are connected to the middle of the box body through an annular supporting plate; the front side and the rear side of the air bag clamp are connected with a first air pump and a second air pump through a first air pipe connector and a second air pipe connector. The lower part of the clamp guide rail body is connected with a push rod, the left and right sides of the push rod are connected with third and fourth lead screw stepping motors through third and fourth connecting rods, and the third and fourth lead screw stepping motors are fixed on the left and right sides of the box body; the first, second, third and fourth lead screw stepping motors control the substrate to move up and down in a coordinated manner; the material utilization rate is improved, the manufacturing cost is reduced, and the manufacturing time is shortened.

Description

Technical Field

[0001] The present invention belongs to the technical field of additive composite manufacturing, and in particular relates to an additive composite manufacturing forming chamber device and a forming method for long tube parts. Background Art

[0002] Additive manufacturing is an emerging technology that can realize the integrated manufacturing of complex-shaped components by converting three-dimensional models into two-dimensional slices and forming them layer by layer. It has the advantages of short production cycle, high material utilization, digitization, automation, and personalization, and is considered to be a "transformative" design and manufacturing integrated technology. Among them, laser powder bed fusion (L-PBF) technology has the advantages of high precision, high quality, and high density. It is one of the most representative and widely used technologies in the field of metal additive manufacturing, and can meet the complex shapes and high-precision technical requirements of core components of the hot end of aircraft engines and gas turbines.

[0003] Materials with titanium as the matrix and other elements added to them are called titanium alloys. As a new type of structural material, titanium alloys are endowed with excellent comprehensive properties, such as good crack growth resistance and fatigue strength, high specific strength and good fracture toughness, low-temperature toughness and excellent corrosion resistance. The maximum operating temperature of titanium alloys can reach 550°C, and they are widely used in aviation, aerospace, chemical industry, shipbuilding and other industrial sectors. For example, TA18 high-strength titanium tubes are used in hydraulic pipeline systems, which can not only meet higher strength requirements, but also meet the needs of lightweight components in aerospace and other fields.

[0004] For Figure 1 The titanium alloy long tube parts shown in the figure have a straight tube length of more than 40cm and a complex curved tube structure. The traditional manufacturing method uses a complex manufacturing process of forging blanks + CNC machining, such as the document "A method for preparing low-cost titanium alloy thin-walled tubes". This process has a large amount of CNC machining and a very low material utilization rate. The remarkable feature of laser powder bed melting technology is that it can perform high-precision manufacturing of complex-shaped parts with high material utilization rate. However, it is limited by the height limit of the formed parts by traditional additive equipment, which makes it impossible to form parts in one piece. Figure 1 The titanium alloy long tube parts shown in the figure are priced at 800-900 yuan / kg for titanium alloy 3D printing powder. Even if the laser powder bed melting technology is used to form the titanium alloy long tube parts in one piece, the printing cost is still high. Figure 1 The titanium alloy long tube parts shown in the figure explore an additive composite manufacturing method that combines traditional manufacturing with additive manufacturing. This is of great significance for improving material utilization, breaking the limitations of traditional additive equipment on the height of formed parts, reducing manufacturing costs and reducing manufacturing time. Summary of the invention

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide an additive composite manufacturing forming chamber device and a forming method for long tube parts. Under the premise of ensuring the forming accuracy of the parts, the forming chamber device can be used for additive equipment using laser powder bed melting technology, breaking the limitation of traditional additive equipment on the height of formed parts; the forming method improves material utilization, reduces manufacturing costs and reduces manufacturing time.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A forming chamber device for additive composite manufacturing of long tube parts, comprising a box body 1, a base plate 19 is provided at the top of the box body 1, the base plate 19 is connected to the top of a fixture guide rail body 20 below it, the fixture guide rail body 20 is connected to an airbag fixture 21, and the airbag fixture 21 moves up and down along the fixture guide rail body 20; the left and right sides of the airbag fixture 21 are respectively connected by a first connecting rod 2, a second connecting rod 3 and a first lead screw nut 14 of a first lead screw stepper motor 4, and a second lead screw nut 15 of a second lead screw stepper motor 5, the first lead screw stepper motor 4 and the second lead screw stepper motor 5 are symmetrically connected to an annular support plate 16, and the annular support plate 16 is connected to the outer side of the middle part of the box body 1;

[0008] The front and rear sides of the airbag clamp 21 are respectively connected to the first air pipe connector 10 and the second air pipe connector 11, and the first air pipe connector 10 and the second air pipe connector 11 are respectively connected to the first air pump 12 and the second air pump 13, and the first air pump 12 and the second air pump 13 are symmetrically connected to the front and rear of the box body 1 through the annular support plate 16;

[0009] The lower part of the clamp guide body 20 is connected to the push rod 22 located below it, and the left and right sides of the push rod 22 are respectively connected by the third connecting rod 6, the fourth connecting rod 7 and the third lead screw nut 17 of the third lead screw stepper motor 8, and the fourth lead screw nut 18 of the fourth lead screw stepper motor 9. The third lead screw stepper motor 8 and the fourth lead screw stepper motor 9 are fixed on the left and right sides of the box body 1; the first lead screw stepper motor 4, the second lead screw stepper motor 5, the third lead screw stepper motor 8 and the fourth lead screw stepper motor 9 coordinate the up and down movement of the control substrate 19.

[0010] The lead screw of the first lead screw stepper motor 4 and the first lead screw nut 14, the lead screw of the second lead screw stepper motor 5 and the second lead screw nut 15, the lead screw of the third lead screw stepper motor 8 and the third lead screw nut 17, and the lead screw of the fourth lead screw stepper motor 9 and the fourth lead screw nut 18 cooperate to form a roller screw transmission.

[0011] The first trachea connector 10 and the second trachea connector 11 both use rubber trachea of ​​sufficient length to cooperate with the up and down movement of the airbag clamp 21 .

[0012] The expansion and contraction structure of the airbag clamp 21 is an annular rubber airbag with a thickness of not less than 5 mm. After the annular rubber airbag expands and contracts, the diameter of the outer wall of the clamped pipe is in the range of 10 to 80 mm. The overall airtightness of the airbag clamp 21 is good. After expansion and contraction, it forms a close annular contact with the outer wall of the clamped pipe and provides sufficient clamping force.

[0013] The substrate 19 is a circular substrate with the same diameter as the inner wall of the box body 1 and a thickness of not less than 30 mm. A circular opening 1901 is opened in the middle, and the circular opening 1901 is used for spreading powder before printing parts.

[0014] The upper part of the box body 1 is provided with four windows, which serve to facilitate the installation of the first connecting rod 2, the second connecting rod 3, the first trachea connecting body 10 and the second trachea connecting body 11; the lower part of the box body 1 is also provided with four windows, the front and rear windows serve to facilitate the installation of the third connecting rod 6 and the fourth connecting rod 7, and the left and right windows serve to limit the displacement stroke of the third connecting rod 6 and the fourth connecting rod 7.

[0015] The annular support plate 16 includes an outer flat plate and an inner vertical plate connected thereto; the outer flat plate is provided with threaded holes for fixing the first screw stepper motor 4, the second screw stepper motor 5, the first air pump 12, and the second air pump 13 to the annular support plate 16 by bolts; the inner vertical plate is provided with through holes and is connected to the outer wall of the box body 1 by bolts.

[0016] The thickness of the annular support plate 16 is not less than 20 mm to ensure sufficient rigidity.

[0017] The clamp guide rail body 20 is provided with a guide rail inside, and the airbag clamp 21 moves up and down along the guide rail; windows are opened around the middle of the clamp guide rail body 20 to limit the displacement stroke of the first connecting rod 2, the second connecting rod 3, the first trachea connector 10 and the second trachea connector 11.

[0018] The first lead screw stepper motor 4, the second lead screw stepper motor 5, the third lead screw stepper motor 8 and the fourth lead screw stepper motor 9 coordinate to control the up and down movement distance of the substrate 19 to be 200 mm.

[0019] The precision of the first lead screw stepper motor 4 , the second lead screw stepper motor 5 , the third lead screw stepper motor 8 and the fourth lead screw stepper motor 9 is at the P1 level.

[0020] The push rod 22 comprises a straight rod portion and a disc portion connected to the top thereof; the disc portion is cylindrically hollow in the middle and is used to place the straight tube portion of a long tube part.

[0021] The forming method of the additive composite manufacturing forming chamber device for long tube parts comprises the following steps:

[0022] S1. Divide the titanium alloy long tube parts into a straight tube part and a curved tube part;

[0023] S2. The straight tube part is formed by extrusion process;

[0024] S3. The bent pipe part adopts laser powder bed melting technology, and the pipe mouth of the straight pipe formed by the extrusion process is blocked with a reducer plug, and then placed in the forming chamber device, and the first air pump 12 and the second air pump 13 work to inflate the airbag clamp 21 until the airbag clamp 21 is in close contact with the outer wall of the straight pipe and provides sufficient clamping force;

[0025] S4. The first screw stepper motor 4 and the second screw stepper motor 5 work in coordination to control the movement of the airbag clamp 21 to fine-tune the nozzle so that the upper surface of the substrate 19 is flush;

[0026] S5. After the nozzle is flush with the upper surface of the substrate 19, metal powder is added from the circular opening of the substrate 19 to the top of the airbag fixture 21 until the metal powder is flush with the upper surface of the substrate 19;

[0027] S6. The first screw stepper motor 4, the second screw stepper motor 5, the third screw stepper motor 8 and the fourth screw stepper motor 9 work in coordination to control the substrate 19 to descend a set distance, and the first screw stepper motor 4 and the second screw stepper motor 5 work in coordination to control the airbag fixture 21 to move up a predetermined distance, and print a layer of support after spreading powder;

[0028] S7. Repeat step S6 until the printed support height reaches the required height;

[0029] S8. After the support printing is completed, the first screw stepper motor 4, the second screw stepper motor 5, the third screw stepper motor 8 and the fourth screw stepper motor 9 work in coordination to control the substrate 19 to descend, and spread powder to print the curved pipe part.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The airbag clamp 21 inside the forming chamber device of the present invention adopts an annular rubber airbag, which can realize the clamping, fixing and positioning of long tube parts of different diameters; and because of the seamless clamping of the airbag and the tube wall, and the use of a reducer to seal the tube mouth, the downward leakage of metal powder is avoided. The height of the metal powder covering the part is much smaller than the height of the part, which saves metal powder, reduces printing costs, and facilitates the recovery of metal powder after printing.

[0032] 2. The forming chamber device of the present invention can first clamp and fix the extruded straight tube inside the forming chamber device, making full use of the internal space of the chamber and breaking the limitation of the original additive equipment on the height of the formed parts.

[0033] 3. The forming method of the present invention divides long tube parts with complex shapes into two parts for separate manufacturing. The straight tube part with large length and low precision requirement is formed by extrusion process, and the curved tube part with complex shape and high precision requirement is formed by laser powder bed melting technology, thus overcoming the limitation of traditional processing technology on part shape.

[0034] 4. The forming method of the present invention first prints the support, which is convenient for cutting and separating the printed long tube parts from the substrate during post-processing.

[0035] 5. Compared with the traditional manufacturing method of forging blank + CNC machining, the forming method of the present invention reduces material waste and shortens manufacturing time because both the laser powder bed melting technology and the extrusion process have the characteristics of high material utilization.

[0036] 6. The forming method of the present invention only uses the laser powder bed melting technology to form the curved pipe part with complex shape and high precision requirements, which reduces the time share of additive manufacturing and reduces the cost of atmosphere protection for avoiding high-temperature oxidation of titanium alloy.

[0037] 7. The forming method of the present invention is not only applicable to titanium alloy parts, but also to parts made of other metal materials, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of titanium alloy long tube parts.

[0039] Figure 2 1 and 2 are a front view (left) and a rear view (right) of a forming chamber device according to an embodiment of the present invention.

[0040] Figure 3 1 and 2 are the left view (left) and right view (right) of the forming chamber device according to an embodiment of the present invention.

[0041] Figure 4 It is a cross-sectional view of a forming chamber device according to an embodiment of the present invention.

[0042] Figure 5 4 is a top view of a forming chamber device according to an embodiment of the present invention.

[0043] Figure 6 1. The front view (left) and rear view (right) of the internal structure of the forming chamber device according to an embodiment of the present invention.

[0044] Figure 7 1 and 2 are a front view (left), a rear view (middle) and a top view (right) of a housing 1 according to an embodiment of the present invention.

[0045] Figure 8 Schematic diagram of connecting rod 2 and connecting rod 3 according to an embodiment of the present invention.

[0046] Fig. 9 Schematic diagram of connecting rod 6 and connecting rod 7 according to an embodiment of the present invention.

[0047] Fig.10 Schematic diagram of the support plate 16 according to an embodiment of the present invention.

[0048] Fig.11 Schematic diagram of a fixture guide rail body 20 according to an embodiment of the present invention.

[0049] Fig.12 Schematic diagram of the push rod 22 according to an embodiment of the present invention.

[0050] Fig.13 It is a schematic diagram of supporting printing according to an embodiment of the present invention. DETAILED DESCRIPTION

[0051] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0052] Reference Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , an additive composite manufacturing forming chamber device for long tube parts, including a box body 1, a base plate 19 is provided on the top of the box body 1, the base plate 19 is connected to the top of the fixture guide rail body 20 below it, the fixture guide rail body 20 is connected to the airbag fixture 21, and the airbag fixture 21 moves up and down along the fixture guide rail body 20; the left and right sides of the airbag fixture 21 are respectively connected by a first connecting rod 2, a second connecting rod 3 and a first lead screw nut 14 of a first lead screw stepper motor 4, and a second lead screw nut 15 of a second lead screw stepper motor 5, the first lead screw stepper motor 4 and the second lead screw stepper motor 5 are symmetrically connected to an annular support plate 16, and the annular support plate 16 is connected to the outer side of the middle part of the box body 1, the first lead screw stepper motor 4 is coordinated to control the up and down movement of the airbag fixture 21 through the first lead screw nut 14 and the first connecting rod 2, and the second lead screw stepper motor 5 is coordinated to control the up and down movement of the airbag fixture 21 through the second lead screw nut 15 and the second connecting rod 3;

[0053] The front and rear sides of the airbag clamp 21 are respectively connected to the first trachea connector 10 and the second trachea connector 11, and the first trachea connector 10 and the second trachea connector 11 are respectively connected to the first air pump 12 and the second air pump 13, and the first air pump 12 and the second air pump 13 are symmetrically connected to the front and rear of the box body 1 through the annular support plate 16. The first air pump 12 and the second air pump 13 inflate the airbag clamp 21 through the first trachea connector 10 and the second trachea connector 11 to adjust the clamping diameter and the clamping force;

[0054] The lower part of the clamp guide rail body 20 is connected to the push rod 22 located below it, and the left and right sides of the push rod 22 are respectively connected through the third connecting rod 6, the fourth connecting rod 7 and the third lead screw nut 17 of the third lead screw stepper motor 8, and the fourth lead screw nut 18 of the fourth lead screw stepper motor 9. The third lead screw stepper motor 8 and the fourth lead screw stepper motor 9 are fixed to the left and right sides of the box body 1. The third lead screw stepper motor 8 and the fourth lead screw stepper motor 9 coordinate and control the up and down movement of the push rod 22 through the third lead screw nut 17 and the third connecting rod 6, the fourth lead screw nut 18 and the fourth connecting rod 7 respectively; the first lead screw stepper motor 4, the second lead screw stepper motor 5, the third lead screw stepper motor 8 and the fourth lead screw stepper motor 9 coordinate and control the up and down movement of the substrate 19.

[0055] Reference Figure 2 and Figure 3 The lead screw of the first lead screw stepper motor 4 and the first lead screw nut 14, the lead screw of the second lead screw stepper motor 5 and the second lead screw nut 15 cooperate to form a roller screw transmission, the purpose of which is to improve the transmission accuracy, stability and service life; the lead screw of the third lead screw stepper motor 8 and the third lead screw nut 17, the lead screw of the fourth lead screw stepper motor 9 and the fourth lead screw nut 18 cooperate to form a roller screw transmission, the purpose of which is to improve the transmission accuracy, stability and service life.

[0056] Reference Figure 2 , Figure 3 The first air pipe connector 10 is connected to the airbag clamp 21 by bolts 23, 24, 25, and 26, and the second air pipe connector 11 is connected to the airbag clamp 21 by bolts 27, 28, 29, and 30. The first air pipe connector 10 and the second air pipe connector 11 both use rubber air pipes of sufficient length to cooperate with the up and down movement of the airbag clamp 21.

[0057] Reference Figure 4 The expansion and contraction structure of the airbag clamp 21 is an annular rubber airbag with a thickness of not less than 5 mm. After the annular rubber airbag expands and contracts, the diameter range of the outer wall of the pipe that can be clamped is 10 to 80 mm. The overall airtightness of the airbag clamp 21 is good. After expansion and contraction, it forms an annular close contact with the outer wall of the clamped pipe to prevent the downward leakage of metal powder and provide sufficient clamping force.

[0058] Reference Figure 4 , Figure 5 The substrate 19 is a circular substrate with the same diameter as the inner wall of the box body 1 and a thickness of not less than 30 mm. A circular opening 1901 with a diameter of 100 mm is opened in the middle. The circular opening 1901 is used for spreading powder before part printing. The substrate 19 can move up and down along the inner wall of the box body 1. The thickness is more than 30 mm to avoid deformation of the substrate 19 during and after part printing.

[0059] Reference Figure 2 , Figure 3 and Figure 7 The upper part of the box body 1 is provided with four windows 101, 102, 103 and 104, which serve to facilitate the installation of the first connecting rod 2, the second connecting rod 3, the first trachea connecting body 10 and the second trachea connecting body 11; the lower part of the box body 1 is also provided with four windows 1013, 1014, 1015 and 1016, the front and rear windows 1015 and 1016 serve to facilitate the installation of the third connecting rod 6 and the fourth connecting rod 7, and the left and right windows 1013 and 1014 serve to limit the displacement stroke of the third connecting rod 6 and the fourth connecting rod 7.

[0060] Reference Figure 5 and Figure 7 The box body 1 is provided with threaded holes 1017, 1018, 1019, 1020, 1021, 1022, 1023 and 1024, for connecting the third screw stepper motor 8 to the box body 1 through bolts 79, 80, 81, 82, and connecting the fourth screw stepper motor 9 to the box body 1 through bolts 83, 84, 85, 86.

[0061] Reference Figure 2 and Figure 8 The first connecting rod 2 has threaded holes 201, 202, 203, and 204 at one end, which are connected to the first screw nut 14 through bolts 31, 32, 33, and 34; the other end of the first connecting rod 2 has threaded holes 205, 206, 207, and 208, which are connected to the airbag clamp 21 through bolts 55, 56, 57, and 58.

[0062] Reference Figure 2 and Figure 8 The second connecting rod 3 has threaded holes 301, 302, 303, and 304 at one end, which are connected to the second screw nut 15 through bolts 35, 36, 37, and 38; the second connecting rod 3 has threaded holes 305, 306, 307, and 308 at the other end, which are connected to the airbag clamp 21 through bolts 59, 60, 61, and 62.

[0063] Reference Figure 2 , Figure 6 and Fig. 9 One end of the third connecting rod 6 is provided with threaded holes 601, 602, 603, 604, 605, 606, 607, 608, which are connected to the push rod 22 through bolts 87, 88, 89, 90, 91, 92, 93, 94; the other end of the third connecting rod 6 is provided with threaded holes 609, 6010, 6011 and 6012, which are connected to the third screw nut 17 through bolts 47, 48, 49, 50.

[0064] Reference Figure 2 , Figure 6 and Fig. 9One end of the fourth connecting rod 7 is provided with threaded holes 701, 702, 703, 704, 705, 706, 707, 708, which are connected to the push rod 22 through bolts 95, 96, 97, 98, 99, 100, 101, 102; the other end of the fourth connecting rod 7 is provided with threaded holes 709, 7010, 7011 and 7012, which are connected to the fourth screw nut 18 through bolts 51, 52, 53, 54.

[0065] Reference Figure 2 , Figure 5 and Fig.10 The annular support plate 16 comprises an outer plate and an inner vertical plate connected thereto; threaded holes 1601, 1602, 1603, 1604, 1605, 1606, 1607, 1608, 1609, 16010, 16011, 16012, 16013, 16014, 16015 and 16016 are provided on the outer plate for fixing the first lead screw stepper motor 4 to the annular support plate 16 by bolts 71, 72, 73 and 74, the second lead screw stepper motor 5 to the annular support plate 16 by bolts 75, 76, 77 and 78, the first air pump 12 to the annular support plate 16 by bolts 67, 68, 69 and 70, and the second air pump 13 to the annular support plate 16 by bolts 63, 64, 65 and 66;

[0066] The inner vertical plate of the annular support plate 16 is provided with through holes 16017, 16018, 16019, 16020, 16021, 16022, 16023 and 16024, and is connected to the outer wall of the box body 1 by bolts 39, 40, 41, 42, 43, 44, 45 and 46;

[0067] The thickness of the annular support plate 16 is not less than 20 mm to ensure sufficient rigidity.

[0068] Reference Fig.11 The clamp guide rail body 20 is provided with a guide rail inside, and the airbag clamp 21 moves up and down along the guide rail; the bottom of the clamp guide rail body 20 is provided with threaded holes 201, 202, 203 and 204 for connecting with the push rod 22; the middle part of the clamp guide rail body 20 is provided with windows 205, 206, 207 and 208 around, which play the role of limiting the displacement stroke of the first connecting rod 2, the second connecting rod 3, the first trachea connecting body 10 and the second trachea connecting body 11.

[0069] The first screw stepper motor 4 and the second screw stepper motor 5 coordinate to control the airbag clamp 21 to move up and down by a distance of 20 mm.

[0070] The first lead screw stepper motor 4, the second lead screw stepper motor 5, the third lead screw stepper motor 8 and the fourth lead screw stepper motor 9 coordinate to control the up and down movement distance of the substrate 19 to be 200 mm.

[0071] The precision of the first lead screw stepper motor 4, the second lead screw stepper motor 5, the third lead screw stepper motor 8 and the fourth lead screw stepper motor 9 is P1 level, the purpose is to improve the printing precision.

[0072] Reference Fig.12 The push rod 22 includes a straight rod portion and a disc portion connected to the top thereof; the straight rod portion is provided with threaded holes 2201, 2202, 2203, 2204, 2205, 2206, 2207, 2208, 2209, 22010, 22011, 22012, 22013, 22014, 22015, 22015 and 22016; the disc portion is provided with threaded holes 22017, 22018, 22019 and 22020, the middle of which is a cylindrical hollow through hole with a diameter of 80 mm, which is used to place the straight tube portion of long tube parts.

[0073] The forming method of the additive composite manufacturing forming chamber device for long tube parts comprises the following steps:

[0074] S1. Divide the titanium alloy long tube parts into a straight tube part and a curved tube part;

[0075] S2. The straight tube part with long length and low precision requirement is formed by extrusion process;

[0076] S3. The curved pipe part with complex shape and high precision requirement adopts laser powder bed melting technology, and the pipe mouth of the straight pipe formed by the extrusion process is blocked with a reducer plug, and then placed in the forming chamber device, and the first air pump 12 and the second air pump 13 work to inflate the airbag clamp 21 until the airbag clamp 21 is in close contact with the outer wall of the straight pipe and provides sufficient clamping force;

[0077] S4. The first screw stepper motor 4 and the second screw stepper motor 5 work in coordination to control the movement of the airbag clamp 21 to fine-tune the nozzle so that the upper surface of the substrate 19 is flush;

[0078] S5. Reference Fig.13 After the tube mouth is flush with the upper surface of the substrate 19, titanium alloy powder is added from the circular opening of the substrate 19 to the top of the airbag fixture 21 until the titanium alloy powder is flush with the upper surface of the substrate 19;

[0079] S6. The first screw stepper motor 4, the second screw stepper motor 5, the third screw stepper motor 8 and the fourth screw stepper motor 9 work in coordination to control the substrate 19 to drop 0.1 mm, the first screw stepper motor 4 and the second screw stepper motor 5 work in coordination to control the airbag fixture 21 to move up 0.1 mm, and a layer of support is printed after the powder is spread;

[0080] S7. Repeat step S6 until the printed support height is 1 mm;

[0081] S8. After the support printing is completed, the first screw stepper motor 4, the second screw stepper motor 5, the third screw stepper motor 8 and the fourth screw stepper motor 9 work in coordination to control the substrate 19 to descend, and spread powder to print the curved pipe part.

[0082] The present invention is described in detail above in conjunction with the embodiments, but the contents described are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope of the present invention.

Claims

1. A chamber device for additive composite manufacturing of long tube parts, comprising a box (1), characterized in that: A base plate (19) is provided at the top of the box body (1), the base plate (19) is connected to the top of the clamp guide rail body (20) below it, the clamp guide rail body (20) is connected to the airbag clamp (21), and the airbag clamp (21) moves up and down along the clamp guide rail body (20); the left and right sides of the airbag clamp (21) are respectively connected by a first connecting rod (2), a second connecting rod (3) and a first lead screw nut (14) of a first lead screw stepping motor (4), and a second lead screw nut (15) of a second lead screw stepping motor (5); the first lead screw stepping motor (4) and the second lead screw stepping motor (5) are symmetrically connected to an annular support plate (16), and the annular support plate (16) is connected to the outer side of the middle part of the box body (1); The front and rear sides of the airbag clamp (21) are respectively connected to the first air pipe connecting body (10) and the second air pipe connecting body (11); the first air pipe connecting body (10) and the second air pipe connecting body (11) are respectively connected to the first air pump (12) and the second air pump (13); the first air pump (12) and the second air pump (13) are symmetrically connected to the front and rear of the box body (1) via an annular support plate (16); The lower part of the fixture guide rail body (20) is connected to a push rod (22) located below it, and the left and right sides of the push rod (22) are respectively connected through a third connecting rod (6), a fourth connecting rod (7) and a third lead screw nut (17) of a third lead screw stepper motor (8), and a fourth lead screw nut (18) of a fourth lead screw stepper motor (9), and the third lead screw stepper motor (8) and the fourth lead screw stepper motor (9) are fixed to the left and right sides of the box body (1); the first lead screw stepper motor (4), the second lead screw stepper motor (5), the third lead screw stepper motor (8) and the fourth lead screw stepper motor (9) coordinate and control the up and down movement of the substrate (19).

2. The device according to claim 1, characterized in that: The lead screw of the first lead screw stepper motor (4) and the first lead screw nut (14), the lead screw of the second lead screw stepper motor (5) and the second lead screw nut (15), the lead screw of the third lead screw stepper motor (8) and the third lead screw nut (17), and the lead screw of the fourth lead screw stepper motor (9) and the fourth lead screw nut (18) cooperate to form a roller screw transmission; the first lead screw stepper motor (4), the second lead screw stepper motor (5), the third lead screw stepper motor (8) and the fourth lead screw stepper motor (9) coordinate to control the up and down movement distance of the substrate (19) to be 200 mm; the precision of the first lead screw stepper motor (4), the second lead screw stepper motor (5), the third lead screw stepper motor (8) and the fourth lead screw stepper motor (9) is P1 level.

3. The device according to claim 1, characterized in that: The first air tube connector (10) and the second air tube connector (11) both use rubber air tubes of sufficient length to cooperate with the up and down movement of the air bag clamp (21).

4. The device according to claim 1, characterized in that: The expansion and contraction structure of the airbag clamp (21) is an annular rubber airbag with a thickness of not less than 5 mm. After the annular rubber airbag expands and contracts, the diameter of the outer wall of the pipe clamped by the annular rubber airbag ranges from 10 to 80 mm. The overall air tightness of the airbag clamp (21) is good. After expansion and contraction, it forms an annular close contact with the outer wall of the clamped pipe and provides sufficient clamping force.

5. The device according to claim 1, characterized in that: The substrate (19) is a circular substrate with a diameter the same as the inner wall of the box (1) and a thickness of not less than 30 mm, and a circular opening (1901) is opened in the middle, and the circular opening (1901) is used for spreading powder before printing parts.

6. The device according to claim 1, characterized in that: The upper part of the box body (1) is provided with four windows for facilitating the installation of the first connecting rod (2), the second connecting rod (3), the first air pipe connecting body (10) and the second air pipe connecting body (11); the lower part of the box body (1) is also provided with four windows, the front and rear windows are provided for facilitating the installation of the third connecting rod (6) and the fourth connecting rod (7), and the left and right windows are provided for limiting the displacement stroke of the third connecting rod (6) and the fourth connecting rod (7).

7. The device according to claim 1, characterized in that: The annular support plate (16) comprises an outer flat plate and an inner vertical plate connected thereto; the outer flat plate is provided with threaded holes for fixing the first screw stepper motor (4), the second screw stepper motor (5), the first air pump (12) and the second air pump (13) by bolts; the inner vertical plate is provided with through holes for being connected to the outer wall of the box body (1) by bolts; the thickness of the annular support plate (16) is not less than 20 mm to ensure sufficient rigidity.

8. The device according to claim 1, characterized in that: The clamp guide rail body (20) is provided with a guide rail inside, and the airbag clamp (21) moves up and down along the guide rail; windows are opened around the middle of the clamp guide rail body (20) to limit the displacement stroke of the first connecting rod (2), the second connecting rod (3), the first air pipe connecting body (10) and the second air pipe connecting body (11).

9. The device according to claim 1, characterized in that: The push rod (22) comprises a straight rod part and a disc part connected to the top thereof; the middle of the disc part is a cylindrical hollow through hole for placing the straight tube part of a long tube part.

10. A forming method using the additive composite manufacturing forming chamber device for long tube parts according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Divide the titanium alloy long tube parts into a straight tube part and a curved tube part; S2. The straight tube part is formed by extrusion process; S3. The curved tube portion adopts laser powder bed melting technology, and the tube mouth of the straight tube formed by the extrusion process is blocked with a reducer plug, and then placed in the forming chamber device, and the first air pump (12) and the second air pump (13) are operated to inflate the airbag clamp (21) until the airbag clamp (21) is in close contact with the outer wall of the straight tube and provides sufficient clamping force; S4. The first screw stepper motor (4) and the second screw stepper motor (5) work in coordination to control the airbag clamp (21) to move finely so that the nozzle is flush with the upper surface of the substrate (19); S5. After the nozzle is flush with the upper surface of the substrate (19), metal powder is added from the circular opening of the substrate (19) to the top of the airbag fixture (21) until the metal powder is flush with the upper surface of the substrate (19); S6. The first lead screw stepper motor (4), the second lead screw stepper motor (5), the third lead screw stepper motor (8) and the fourth lead screw stepper motor (9) work in a coordinated manner to control the substrate (19) to descend a set distance, and the first lead screw stepper motor (4) and the second lead screw stepper motor (5) work in a coordinated manner to control the airbag fixture (21) to move up a predetermined distance, and a layer of support is printed after powder is applied; S7. Repeat step S6 until the printed support height reaches the required height; S8. After the support printing is completed, the first screw stepper motor (4), the second screw stepper motor (5), the third screw stepper motor (8) and the fourth screw stepper motor (9) work in a coordinated manner to control the substrate (19) to descend, and powder is spread to print the curved pipe part.

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