CN117733155A - Device and method for additive connection - Google Patents
Device and method for additive connection Download PDFInfo
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- CN117733155A CN117733155A CN202311771678.5A CN202311771678A CN117733155A CN 117733155 A CN117733155 A CN 117733155A CN 202311771678 A CN202311771678 A CN 202311771678A CN 117733155 A CN117733155 A CN 117733155A
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Abstract
The device comprises a laser, a workbench, a special fixture for material addition connection, a laser deposition head, a deposition bin and a powder feeder, wherein the laser is electrically connected with the laser deposition head, the special fixture for material addition connection and the workbench are arranged in the deposition bin, the special fixture for material addition connection is arranged on the workbench, a powder feeder powder conveying pipe is communicated with a powder inlet of the laser deposition head, and a plurality of air inlets are formed in the deposition bin. According to the invention, the pressure of the connecting device to the connecting piece is regulated for many times in the process of material adding and connecting of the segmented components, so that mechanical constraint force is provided for the connected components of the material adding and connecting to improve the cracking problem of the high-temperature titanium alloy caused by accumulation of residual stress of solid phase change, the mechanical property of the connected components of the material adding and connecting are improved, the dimensional accuracy of the connected components of the material adding and connecting are improved, a certain amount of hydrogen is added in protective atmosphere, the plasticity of the connected components of the material adding and connecting is improved by utilizing hydrogen softening, and the cracking problem in the process of material adding and connecting is solved.
Description
Technical Field
The invention relates to the technical field of additive manufacturing, in particular to a device and a method for additive connection.
Background
The additive manufacturing (Additive Manufacturing) technology is a technology for manufacturing solid parts by adopting a material gradual accumulation method, and is a manufacturing method from bottom to top relative to the traditional material removal cutting processing technology. The technology solves the problem of forming a plurality of parts with complex structures, greatly reduces the processing procedures and shortens the processing period. The laser additive manufacturing technology (Laser Additive Manufacturing, LAM) is to melt metal powder synchronously conveyed by high-power laser under the control of computer programming on the basis of slicing data of a CAD three-dimensional solid model of a part, melt partial materials on the surface of a base material, mix the metal powder and the base material to form a molten pool, quickly solidify after a laser beam sweeps through the molten pool, deposit the metal powder on the solidified base material, and accumulate the metal powder layer by layer to finally obtain the three-dimensional part. Of these, most typical are laser deposition fabrication techniques (Laser Deposition Manufacturing, LDM) and selective laser melt forming techniques (Selective Laser Melting, SLM). The LDM is different from the SLM in the powder adding form, and the powder adding form uses laser as a heat source to melt the metal powder synchronously fed by the powder feeder; and before the laser beam scans, a layer of metal powder is pre-paved on the substrate by using a powder paving roller, and then the powder is selectively melted by using the laser beam according to a preset scanning track.
The whole deposition manufacturing flow comprises five parts, namely forming pretreatment, forming processing, connecting pretreatment, material adding connection and post-treatment, wherein the pretreatment mainly comprises three-dimensional modeling of parts, model slicing treatment, check and repair of slice files, determination of model placement positions and determination of processing parameters (such as laser power, scanning speed, scanning strategy, lap joint rate and the like); the forming process is the stage of processing and manufacturing the part; the material adding connection is to connect the components manufactured in blocks, and a connecting groove is needed to be processed for connection; most deposition fabrication and additive bonding processes need to be performed under an inert protective gas atmosphere. The post-treatment refers to the process of repairing the surface and the supporting structure of the steel plate to meet the requirement of the working condition after the machining is finished.
The large-sized component has long scanning path, long forming time, more serious accumulation of residual stress, obvious deformation and cracking trend and difficult guarantee of forming geometric precision. Therefore, in order to control stress and deformation and improve the forming quality of the large-sized member, the additive manufacturing of the large-sized member at present usually adopts an additive connection mode, namely the whole member is discretized into a plurality of parts according to the structural characteristics and the additive process characteristics of the member, and the parts are independently formed and then connected together according to a reasonable sequence, so that the forming of the large-sized member is finally realized. The segmented forming reduces the size of the formed part, is relatively easier to relieve for residual stresses and deformations, and tends to provide better forming performance and accuracy than large-sized parts by scanning discrete stresses in segments during the forming process. Therefore, the quality of the additive connection is ensured, and the method is important to realizing the overall high-quality manufacturing of large structural parts.
The laser additive connection technology is different from the laser additive manufacturing technology, and the laser additive connection technology refers to the process of forming and connecting two or more metal components into a whole component by utilizing the LDM technology and completing the connection at the same time of forming. The connecting area is directly formed into a near net-shaped connecting area through layer-by-layer fusion deposition of metal powder, and is a novel special connecting technology. Laser additive bonding has a great advantage over other bonding techniques. The device can be connected with large and complex components, has high flexibility, and has high forming precision, and the connection structure is not limited by a processing technology; the method does not need more subsequent machining, and has high material utilization rate, short production period and low processing cost; in addition, the laser additive connection process can ensure the rapid fusion of the metal material, so that the microstructure of the connection area is tiny, the element distribution is uniform, the structure is fine, and the comprehensive mechanical property is excellent. However, deformation and cracking of the component caused by coupling of the thermal stress generated by the laser beam with small range and local high energy density in the connecting area, the structural stress generated by material phase transformation and the solidification shrinkage stress generated by the molten pool and external constraint stress are unavoidable and extremely serious, and particularly for some high-temperature titanium alloy materials with poor processing plasticity, the application of the laser additive connection technology in the connection of large-scale titanium alloy components is severely limited. There is therefore a need for an effective additive bonding solution to the problem of severe deformation and cracking during bonding.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a device and a method for additive connection, which apply external pressure or tensile force to connected parts, ensure that the sizes of components reach design theoretical values after connection is completed, effectively solve the problems of cracking and deformation in the connection process and improve the connection forming quality of the parts.
In order to achieve the above object, the technical scheme of the present invention is as follows:
the utility model provides a device that vibration material disk connects, includes laser instrument, workstation, vibration material disk connects special fixture, laser deposition head, deposition storehouse and send the powder ware, and laser instrument and laser deposition head electricity are connected, and in deposition storehouse was arranged in to laser deposition head, vibration material disk connected special fixture and workstation, vibration material disk was connected special fixture and is placed on the workstation, send powder ware powder pipe and laser deposition head to advance powder mouth intercommunication, offered a plurality of air inlets on the deposition storehouse.
Further, the special fixture is connected to the material adding includes base plate, lower plate, punch holder, adjusting structure, jack top push the arm-tie and locating plate, the lower plate be located the base plate top, punch holder symmetry is arranged in the punch holder top, punch holder passes through bolted connection with the lower plate, the base plate both sides set up the locating plate, the locating plate is fixed with the base plate, punch holder installs jack top push the arm-tie towards the base plate side, install adjusting structure between base plate and the jack top push the arm-tie, adjusting structure includes four equal length extension supporting plates and lead screw, two liang articulates between the supporting plates constitutes the quadrangle structure, two diagonal angles below in the quadrangle structure set up the helicoidal, in the helicoidal screw in, lead screw one end installation nut, the other two diagonal angles of quadrangle structure are articulated with locating plate middle part and jack top push the arm-tie middle part respectively, evenly distributed a plurality of location scale marks on the base plate.
Further, the blocking component is arranged between the upper clamping plate and the lower clamping plate, the pressure sensor is arranged in the blocking component, the dial is arranged on the positioning plate on one side of the base plate, and the dial is electrically connected with the pressure sensor.
The using method of the additive connection device comprises the following steps:
step one: dividing the integral structural member into blocks, then carrying out layering slicing and partitioning division on each block to form an additive printing process digital model, selecting proper laser deposition manufacturing forming process parameters, and carrying out laser deposition manufacturing on each block structural member;
step two: after the material adding of the block members is finished, carrying out stress relief annealing heat treatment on the block members, carrying out rough machining on each block member after the heat treatment, reserving a certain finish machining allowance, carrying out nondestructive testing, preparing a unilateral groove in each block connecting area after the defect detection index is met, carrying out polishing treatment on the groove and surrounding areas, and cleaning after polishing;
step three: installing the segmented components after the treatment in the step two in a special fixture for additive connection, aligning the bottoms of grooves of the two segmented components with positioning scale marks on the fixture during installation, ensuring the alignment of interfaces of two connecting pieces, reserving connection allowance at the bottoms of the grooves of the segmented components, starting a laser and a powder feeder to carry out additive connection, filling inert protective gas into a deposition bin, continuously adjusting the pressure or the tension of the connecting fixture on the connecting pieces by rotating nuts on a screw rod during the connection process until the size of the additive connecting components just reaches the theoretical size, and ending the adjustment of the connection pressure or the tension;
step four: after the material adding connection of each block component is completed, the integral component is annealed and dehydrogenated firstly, the aims of eliminating residual stress and dehydrogenating are fulfilled, and then solution heat treatment is performed, so that the structure regulation and control of the connected integral component are fulfilled. And after the heat treatment is finished, rough machining and nondestructive testing are carried out on the integral component, and after the defect index is met, finishing treatment is carried out on the integral component.
Further, the unilateral groove in the step two is V-shaped, X-shaped or Y-shaped, and the groove angle ranges from 10 degrees to 75 degrees.
Further, the reserved connection allowance at the bottom of the groove of the block member is 0.5mm-3mm.
Further, the inert shielding gas in the third step is a mixed gas of argon and hydrogen, wherein the volume ratio of the hydrogen to the volume of the deposition bin is 0.01% -3%.
The invention has the beneficial effects that:
(1) The problem that the integral large-sized component is easy to crack due to oversized dimension and poor in forming precision in the additive manufacturing process is solved by printing the integral large-sized component in a blocking way.
(2) The pressure of the connecting device to the connecting piece is adjusted for a plurality of times in the material adding and connecting process of the block members, so that mechanical constraint force is provided for the material adding and connected members, the problem of cracking of high-temperature titanium alloy caused by accumulation of solid phase transition residual stress is solved, and the mechanical property of the material adding and connecting members is improved.
(3) The tensile force of the connecting device on the connecting piece is adjusted for a plurality of times in the material adding and connecting process of the block members, deformation caused by uneven expansion and inelastic strain of the materials in the phase change process due to extreme temperature gradient in the thermal cycle process of the metal materials is controlled, and the dimensional accuracy of the material adding and connecting members is improved.
(4) In the process of material addition connection, a certain amount of hydrogen is added into the protective atmosphere, and the plasticity of the material addition connection component is improved by softening through hydrogen, so that the cracking problem in the process of material addition connection is solved; after the material-adding connection is completed, the structure of the connection region is regulated and controlled through dehydrogenation heat treatment, so that the comprehensive mechanical property of the material-adding connection region is improved.
Drawings
FIG. 1 is a schematic illustration of an additive-coupled device according to the present invention;
FIG. 2 is a top view of the additive bonding special fixture provided by the present invention;
FIG. 3 is a schematic structural view of a special fixture for additive connection provided by the invention;
FIG. 4 is a flow chart of an additive manufacturing technique provided by the present invention;
FIG. 5 is a schematic view of the blunt edge distance and the bottom connection margin of the blocking member according to the present invention;
FIG. 6 is a schematic illustration of additive joint layering partitions provided by the present invention;
FIG. 7 is a schematic illustration of the applied pressure to improve cracking principles provided by the present invention;
FIG. 8 is a schematic diagram of the applied tension improving deformation principle provided by the invention;
FIG. 9 is a microstructure view of the Ti65 additive bond pad OM 500 times provided by the present invention;
fig. 10 is a microstructure view of the Ti65 additive junction OM 200 times provided by the present invention.
Reference numerals in the drawings of the specification include:
the device comprises a laser device 1, a workbench 2, a special fixture for 3-material adding connection, a laser deposition head 4, a deposition bin 5, a powder feeder 6, a base plate 7, a lower clamping plate 8, an upper clamping plate 9, an adjusting structure 10, a jack pushing pulling plate 11, a positioning plate 12 and a dial 13.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention.
As shown in fig. 1 to 3, an additive connection device comprises a laser 1, a workbench 2, an additive connection special fixture 3, a laser deposition head 4, a deposition bin 5 and a powder feeder 6, wherein the laser 1 is electrically connected with the laser deposition head 4, the additive connection special fixture 3 and the workbench 2 are arranged in the deposition bin 5, the additive connection special fixture 3 is arranged on the workbench 2, a powder feeder 6 powder conveying pipe is communicated with a powder inlet of the laser deposition head 4, and a plurality of air inlets are formed in the deposition bin 5.
The special fixture is connected to the material adding includes base plate 7, lower plate 8, punch holder 9, adjusting structure 10, jack pushing pulling plate 11 and locating plate 12, lower plate 8 be located the base plate top, punch holder 9 symmetry is arranged in lower plate 8 top, punch holder 9 passes through bolted connection with lower plate 8, base plate 7 both sides set up locating plate 12, locating plate 12 is fixed with base plate 7, punch holder 9 installs jack pushing pulling plate 11 towards base plate 7 side, install adjusting structure 10 between base plate 7 and the jack pushing pulling plate 11, adjusting structure 10 includes four equal length extension supporting plates and lead screw, two liang articulates between the supporting plates constitutes the quadrangle structure, two diagonal angles below in the quadrangle structure set up the helicoidal, in the lead screw in the helicoidal, lead screw one end installation nut, two other diagonal angles of quadrangle structure are articulated with locating plate 12 middle part and jack pushing pulling plate 11 middle part respectively. A plurality of positioning scale marks are uniformly distributed on the base plate 7, a blocking member is arranged between the upper clamping plate 8 and the lower clamping plate 9, a tension pressure sensor is arranged in the blocking member, a dial 13 is arranged on a positioning plate on one side of the base plate, and the dial 13 is electrically connected with the pressure sensor. The pulling pressure value of the block member is checked through the dial 13, so that the force value can be conveniently adjusted in the process of material adding and connecting.
As shown in fig. 4 to 6, a method for using an additive-connected device includes the following steps:
the material used in this example was Ti65 high temperature titanium alloy.
Step one: dividing the large structural member into blocks, determining forming technological parameters, and manufacturing each block structural member in an additive way;
step 1.1: processing small features such as holes, bosses, chamfers and the like which cannot be printed in the additive manufacturing in the integral geometric digital-analog, setting the blank allowance of the laser deposition manufactured component to be unilateral 3mm, and establishing the integral component additive manufacturing process digital-analog;
step 1.2: dividing the whole component into blocks according to the size requirements of 250mm in the longitudinal direction and 100mm in the deposition direction of laser deposition, and keeping the thickness of the block component unchanged to form a digital-analog of the block process of laser deposition;
step 1.3: setting laser deposition manufacturing parameters of each segmented component, wherein the laser power is 4500W-5000W, the scanning speed is 8mm/s-12mm/s, the lap joint rate is 50%, the powder feeding amount is 14g/min-18g/min, the scanning track is serpentine short-side scanning, and the interval time between adjacent deposition layers is set to be 20s in order to reduce thermal stress accumulation. When the oxygen content in the argon protective atmosphere of the forming bin is lower than 100ppm, starting additive manufacturing;
step 1.4: and (3) completing the laser deposition manufacture of each segmented component according to the step 1.3, and removing powder and splash particles on the surfaces of the segmented components after the components are cooled to room temperature.
Step two: carrying out stress relief annealing heat treatment on each block component of the additive manufacturing, carrying out nondestructive testing, and machining to prepare a groove after the defect detection index is met;
step 2.1: carrying out vacuum destressing annealing heat treatment on the segmented component, cleaning the segmented component with alcohol, placing the cleaned segmented component into a vacuum heat treatment furnace, and vacuumizing to 1.5 multiplied by 10 -3 Pa, heating to 700-750deg.C at a speed of 10-20deg.C/min, and vacuum degree in furnace higher than 3×10 -3 Pa, preserving heat for 2-4 h, cooling to room temperature in a furnace, and taking out;
step 2.2: firstly, rough machining is carried out on each segmented component after heat treatment, finishing allowance with single-side allowance of 2mm is reserved, then nondestructive testing is carried out on each segmented component, no defects such as air holes, cracks, unfused fusion and inclusions are ensured to exist in the material increase, and each segmented component is ensured to meet the ultrasonic AA level detection standard;
step 2.3: preparing a unilateral groove, a V-shaped groove, an X-shaped groove or a Y-shaped groove and the like for each block component connecting area meeting the nondestructive testing standard, wherein the angle range of the groove is 10-75 degrees, and a blunt edge allowance of 0.5-1 mm is reserved at the bottom of the groove. And finally polishing the groove and surrounding areas, and cleaning the groove after polishing to ensure that the surface of the groove is free of greasy dirt and other impurities.
Step three: preparing before the material addition connection, mounting the block members on a special fixture 3 for the material addition connection, washing the material addition connection deposition bin 5, and setting the technological parameters of the material addition connection;
step 3.1: the split components are placed between the upper clamping plate 9 and the lower clamping plate 8, the two split components are respectively fixed on jack pushing pulling plates 11 on two sides through bolts, nuts are guaranteed to be in a screwing state, the lower clamping plate 8 and the upper clamping plate 9 are connected through the bolts so as to achieve longitudinal fixation of the split components, and at the moment, the bolts between the upper clamping plate 9 and the lower clamping plate 8 are guaranteed not to be screwed, and the split components are only used for limiting structures.
Step 3.2: aligning the bottoms of the grooves of the two block members with positioning scale marks on a clamp so as to realize the alignment and longitudinal positioning of the positions of the block members; in order to realize the penetration effect of single-sided connection and double-sided forming, a connection allowance of 0.5-3mm is reserved at the bottom of the groove of the block component;
step 3.3: when the additive is connected, argon with the purity of more than 99.9 percent and hydrogen with the purity of more than 99.9 percent are filled into the deposition bin 5, and the volume of the hydrogen accounts for 0.01 to 3 percent of the volume of the deposition bin. When the oxygen content in the protective atmosphere is lower than 100ppm, starting the additive connection of the block components;
step 3.4: setting the process parameters of material adding and connecting of a block component, wherein the laser power is 1800W-2200W, the scanning speed is 6mm/s-10mm/s, the lap joint rate is 50%, the powder feeding amount is 6g/min-10g/min, before material adding and connecting, layering slicing is carried out through slicing software, a single-layer scanning track is planned, the material adding and connecting area is divided into nine layers from bottom to top, the scanning track from the first layer to the third layer is long-side single-channel scanning, the fourth layer to the last layer adopts regional snake-shaped short-side scanning, and the regional length is 1/4 of the length of the material adding and connecting component;
step 3.5: in the process of material adding connection, a nut on a screw rod is rotated to apply pressure to a connected piece and continuously change the pressure value, so that the situation that the part is cracked due to accumulation of residual stress caused by solid phase change in the process of material adding connection is improved, and the pressure applied in the process of material adding connection is mainly applied to alloy with poor weldability and easy cracking, such as Ti65 high-temperature titanium alloy and the like;
step 3.6: performing additive connection on the first layer to the third layer according to the technological parameters in the step 3.4, wherein in the connection process, the pressure value between connected pieces is kept to be zero;
step 3.7: after the third layer is connected, carrying out additive connection of the fourth layer to the sixth layer, and applying pressure to the block members by rotating nuts on the screw rods, wherein the pressure value is 50-200N or 5% -10% of the compressive strength of the block members;
step 3.8: when the seventh layer is connected with the ninth layer through the additive, the nuts on the screw rods are rotated, the pressure of the fixture on the connected component is continuously increased, and the pressure value is increased to 200-400N or 10% -20% of the compressive strength of the block component;
step 3.9: and by analogy, reasonably adjusting the pressure value in the process of material addition connection until the size of the material addition connection component just reaches the theoretical size, and ending the adjustment of the connection pressure; in the process of material addition connection, the tensile force applied to the connected piece is continuously changed, and deformation caused by uneven expansion and inelastic strain of the material in the phase change process due to extreme temperature gradient in the thermal cycle process of the metal material is controlled. The tensile force applied in the process of material addition connection is mainly applied to alloy with larger material addition deformation so as to improve connection forming precision;
step four: post-processing the integral component with the connected additive, and completing integral additive deposition manufacturing of the large-scale component;
step 4.1: cleaning the block members after the material addition connection with alcohol, performing stress relief annealing and dehydrogenation heat treatment on the whole block members to eliminate the whole residual stress and dehydrogenation, placing the block members after the material addition connection into a vacuum heat treatment furnace, and vacuumizing to 1.5X10 -3 Pa, heating to 720-750deg.C at a speed of 10-20deg.C/min, and vacuum degree in furnace higher than 3×10 -3 Pa, preserving heat for 2-4 h, and cooling the furnace toCooling to room temperature and taking out;
step 4.2: carrying out solid solution aging heat treatment on the segmented component after the material addition connection to realize the structure regulation and control of Ti65 high-temperature alloy, cleaning the segmented component after the material addition connection by alcohol, placing the segmented component into a vacuum heat treatment furnace, and vacuumizing to 1.5 multiplied by 10 -3 Pa, heating to 1000-1020 deg.C at a speed of 10-20deg.C/min, and vacuum degree in the furnace higher than 3×10 -3 Pa, preserving heat for 2h, cooling to 700-750 ℃, preserving heat for 2-4 h, air-cooling to room temperature, and taking out.
Step 4.3: and 4, carrying out single-side allowance rough machining on the component treated in the step 4.2, and then carrying out nondestructive testing to ensure that the additive connecting area has no defects such as air holes, cracks, unfused fusion, inclusions and the like, and ensure that the additive connecting integral component meets the ultrasonic AA level detection standard.
Step 4.4: and (3) machining the component treated in the step (4.3) according to a finish machining digital-to-analog, and detecting the size of the component to finish the additive forming manufacturing of the large-scale integral component.
The implementation effect is as follows:
(1) By adopting the technical scheme in the invention, pressure is applied to the deposition connecting piece in the process of material addition connection, and the pressure value is continuously adjusted according to the increase of the deposition layer number, so that the occurrence of cracking conditions in the process of high-temperature titanium alloy material addition connection can be effectively reduced, the defects of pores, unfused cracks and the like in the process of material addition connection are reduced, and the internal quality of the connecting piece is improved. And plays a role of refining grains, improves the mechanical property of the additive connecting member, and the schematic diagram is shown in figure 7.
(2) By adopting the technical scheme in the invention, in the process of material addition connection, the tensile force is applied to the deposited connection layer, and the tensile force value is continuously adjusted according to the increase of the deposited layer number, so that the deformation of the high-temperature titanium alloy component in the process of material addition connection of the high-temperature titanium alloy can be effectively reduced, and the schematic diagram is shown in figure 8.
(3) In the process of carrying out additive connection by adopting the technical scheme, a hydrogen placing mode of mixing a certain proportion of hydrogen into an inert gas protection bin for additive connection is adopted, and the weldability of the Ti65 high-temperature titanium alloy is improved by taking the Ti65 high-temperature titanium alloy as an example by utilizing a hydrogen softening principle. After the heat treatment for dehydrogenation and solid solution effective heat treatment, the structural performance of the Ti65 high-temperature titanium alloy component is improved, the length-width ratio of original beta grains is reduced, the additive connection structure is a basket structure, no obvious cluster appears at the grain boundary, the value of the average alpha phase length-width ratio is reduced, and the microstructure diagrams are shown in figures 9 to 10.
Claims (7)
1. The device for connecting the additive is characterized by comprising a laser, a workbench, a special fixture for connecting the additive, a laser deposition head, a deposition bin and a powder feeder, wherein the laser is electrically connected with the laser deposition head, the special fixture for connecting the additive and the workbench are arranged in the deposition bin, the special fixture for connecting the additive is arranged on the workbench, a powder feeder powder conveying pipe is communicated with a powder inlet of the laser deposition head, and a plurality of air inlets are formed in the deposition bin.
2. The device for connecting the material adding device according to claim 1, wherein the special fixture for connecting the material adding device comprises a substrate, a lower clamping plate, an upper clamping plate, an adjusting structure, a jack pushing pulling plate and a positioning plate, wherein the lower clamping plate is positioned above the substrate, the upper clamping plate is symmetrically arranged above the lower clamping plate, the upper clamping plate is connected with the lower clamping plate through bolts, the positioning plates are arranged on two sides of the substrate, the positioning plate is fixed with the substrate, the jack pushing pulling plate is arranged on the upper clamping plate towards the side of the substrate, the adjusting structure is arranged between the substrate and the jack pushing pulling plate, the adjusting structure comprises four supporting plates and a screw rod, the supporting plates are equal in length, two pairs of the supporting plates are hinged to form a quadrilateral structure, a thread ring is arranged below two opposite angles in the quadrilateral structure, the screw rod is screwed into the thread ring, one end of the screw rod is provided with a nut, and the other two opposite angles of the quadrilateral structure are hinged to the middle part of the positioning plate and the middle part of the jack pushing pulling plate respectively, and a plurality of positioning scale marks are uniformly distributed on the substrate.
3. The device for additive connection according to claim 1, wherein the partitioning member is installed between the upper and lower clamping plates, a tension pressure sensor is installed in the partitioning member, a dial is installed on a positioning plate on one side of the base plate, and the dial is electrically connected with the pressure sensor.
4. A method of using an additive bonded device according to claim 2, comprising the steps of:
step one: dividing the integral structural member into blocks, then carrying out layering slicing and partitioning division on each block to form an additive printing process digital model, selecting proper laser deposition manufacturing forming process parameters, and carrying out laser deposition manufacturing on each block structural member;
step two: after the material adding of the block members is finished, carrying out stress relief annealing heat treatment on the block members, carrying out rough machining on each block member after the heat treatment, reserving a certain finish machining allowance, carrying out nondestructive testing, preparing a unilateral groove in each block connecting area after the defect detection index is met, carrying out polishing treatment on the groove and surrounding areas, and cleaning after polishing;
step three: installing the segmented components after the treatment in the step two in a special fixture for additive connection, aligning the bottoms of grooves of the two segmented components with positioning scale marks on the fixture during installation, ensuring the alignment of interfaces of two connecting pieces, reserving connection allowance at the bottoms of the grooves of the segmented components, starting a laser and a powder feeder to carry out additive connection, filling inert protective gas into a deposition bin, continuously adjusting the pressure or the tension of the connecting fixture on the connecting pieces by rotating nuts on a screw rod during the connection process until the size of the additive connecting components just reaches the theoretical size, and ending the adjustment of the connection pressure or the tension;
step four: after the material adding and connection of each block component are completed, firstly, annealing and dehydrogenation treatment is carried out on the integral component to achieve the aims of eliminating residual stress and dehydrogenation, then, solution heat treatment is carried out to achieve the structure regulation and control of the connected integral component, after the heat treatment is completed, rough machining and nondestructive testing are carried out on the integral component, and after defect indexes are met, finish machining treatment is carried out on the integral component.
5. The method of claim 4, wherein the single-sided bevel in the second step is V-shaped, X-shaped, or Y-shaped, and the bevel angle ranges from 10 ° to 75 °.
6. The method of claim 4, wherein the reserved connection allowance is 0.5mm-3mm at the bottom of the groove of the block member.
7. The method of claim 4, wherein the inert shielding gas in the third step is a mixture of argon and hydrogen, and the volume of hydrogen is 0.01% -3% of the volume of the deposition chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311771678.5A CN117733155A (en) | 2023-12-21 | 2023-12-21 | Device and method for additive connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311771678.5A CN117733155A (en) | 2023-12-21 | 2023-12-21 | Device and method for additive connection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117733155A true CN117733155A (en) | 2024-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311771678.5A Pending CN117733155A (en) | 2023-12-21 | 2023-12-21 | Device and method for additive connection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117733155A (en) |
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2023
- 2023-12-21 CN CN202311771678.5A patent/CN117733155A/en active Pending
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