Powder point-by-point high-pressure torsion consolidation type additive device and process

Abstract

The application discloses a kind of powder point high-pressure torsion consolidation type additive devices and process, including support frame, lifting platform and horizontal transverse positioning mechanism, horizontal transverse positioning mechanism is connected with mobile positioning plate, installation frame is provided on mobile positioning plate, the bottom of mobile positioning plate is connected with the forming die group located above lifting platform;Forming die group includes fixedly arranged in the bottom of mobile positioning plate cylinder, coaxially rotates and is arranged in the rotating die of cylinder inside and slides and sets up the movable die assembly on the outside of rotating die bottom end, movable die assembly is formed by a plurality of movable die monomers closed ring structure in turn adjacent, each movable die monomer can independently vertically move;The top of installation frame is fixedly provided with rotating drive mechanism, pressurizing mechanism and automatic feeding mechanism respectively.The application realizes material addition and organization reconstruction synchronous completion, reaches the excellent effect of defect in situ elimination and grain ultrafine, significantly improves the density and mechanical properties of component, and also can make heterogeneous material strong combination.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of powder metallurgy manufacturing, in particular to a powder point-by-point high-pressure torsion solidification type additive device and process. BACKGROUND

[0002] Key components in the fields of aerospace, military, nuclear power, etc. face extreme environmental tests such as high pressure, corrosion, electromagnetic interference, etc. in actual combat, flight, equipment operation, etc. Any slight performance problem may cause serious catastrophic consequences. Therefore, it is urgent to improve the service reliability of key complex components in extreme environments. Traditional metal component manufacturing technologies (such as casting and forging) have problems such as difficulty in forming complex structures. Although additive manufacturing can significantly broaden the forming complexity of formed components, existing additive manufacturing technologies are mostly liquid-phase additive technologies based on rapid heating and solidification (such as electric arc wire additive, plasma arc wire additive, laser powder bed fusion additive, etc.) which are prone to thermal defects such as coarse grain formation, high-melting-point brittle phase formation, and micro-porosity in extreme environment component manufacturing, as well as high residual stress and residual deformation, which are difficult to meet the use requirements. Therefore, it is urgent to develop solid-phase additive manufacturing technologies with low heat input, low residual stress, and small grain size and excellent performance of the manufactured parts, which have become key technologies to break through the manufacturing bottleneck in the fields of aerospace, nuclear power, etc.

[0003] In the field of high-end equipment manufacturing, solid-phase additive manufacturing technology has emerged with unique advantages, such as solid-phase additive technology based on friction stirring or diffusion bonding principles. However, the existing shortcomings seriously restrict its further development and widespread application. Friction stirring cannot directly achieve powder solidification without heating. Preheating is required to realize solid-phase additive manufacturing, which is difficult to form complex components and has poor solidification effect. In terms of heat input and microstructure performance regulation, it is difficult to efficiently realize powder solidification and block connection under room temperature and low heat conditions, it is difficult to form dense ultra-fine grain structure, and it is difficult to regulate heterogeneous structure by layering, which restricts the preparation of super-strong and super-tough components. When additive manufacturing of complex materials is mixed, the manufacturing capability of metal combinations with large differences in melting point is insufficient, and the powder mixing and regulation means are scarce, which hinders the innovation of complex material components. In terms of mechanical property uniformity guarantee, it is difficult to eliminate undesirable texture, and the performance of components in different directions is greatly different, which cannot meet the strict requirements of high-end fields and has poor reliability under complex working conditions. SUMMARY

[0004] This invention patent provides a powder-based point-to-point high-pressure torsion consolidation additive manufacturing device and process, successfully breaking through the bottlenecks of traditional manufacturing technology. This invention integrates the ability of coaxial powder deposition to add material layer by layer with the intense plastic deformation and ultrafine crystallization capabilities of high-pressure torsion in situ, achieving simultaneous material addition and microstructure reconstruction. This results in excellent in-situ defect elimination and grain refinement, significantly improving the density and mechanical properties of components. It also enables strong bonding of dissimilar materials, meeting the application requirements of special material composite structures in aerospace, nuclear energy, and other fields. Simultaneously, by employing a progressive execution method, point-to-point deposition and layer-to-layer torsion are carried out along the three-dimensional path of the component, precisely controlling material flow and deformation. This effectively solves the problem of uneven deformation in different parts of the sample in traditional integral torsion processes, significantly improving microstructure uniformity.

[0005] In addition, a special forming module is designed, deeply integrating horizontal positioning, vertical feeding, and horizontal torsion mechanisms to achieve multi-functional integration. This allows for orderly alternation between feeding and pressure / torsion, eliminating gaps at deposition points and doubling efficiency. Employing a multi-drive system, while feeding powder via a screw, the number of pressure / torsion rotations and the torsion speed are adjusted according to the target material properties, allowing for customized manufacturing and truly realizing full-dimensional programmable manufacturing of complex components, from geometry to microstructure.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A powder point-by-point high-pressure torsion consolidation additive manufacturing device includes a support frame, a lifting platform disposed at the bottom of the inner side of the support frame, and a horizontal lateral positioning mechanism disposed at the top of the support frame. The top positioning output end of the horizontal lateral positioning mechanism is fixedly connected to a movable positioning plate, the top of the movable positioning plate is fixedly provided with an mounting frame, and the bottom of the movable positioning plate is connected to a forming module located above the lifting platform.

[0008] The forming module includes a cylinder fixedly disposed at the bottom of the movable positioning plate, a rotating mold coaxially rotatably disposed within the cylinder, and a moving mold assembly slidably sleeved on the outer side of the bottom end of the rotating mold. The moving mold assembly is formed by several moving mold units sequentially adjacent to each other to form a closed ring structure, and each moving mold unit can move independently vertically.

[0009] The top of the mounting frame is respectively fixed with a rotation drive mechanism for driving the rotating mold to rotate horizontally, a pressurizing mechanism for driving the rotating mold to rise and fall vertically, and an automatic feeding mechanism located inside the rotating mold.

[0010] Further, the movable die assembly further comprises a hoop barrel coaxially sleeved outside the rotating die and fixedly connected to the bottom surface of the barrel, a guide slot corresponding to each movable die unit is formed in the side wall of the hoop barrel, a connecting rod movably arranged in the guide slot is fixedly connected to the outer side wall of the movable die unit, a connecting block is fixedly connected to one end of the connecting rod located outside the movable die unit, and a first spring is connected between the top surface of the connecting block and the bottom surface of the top wall of the hoop barrel.

[0011] Further, the rotating die is internally provided with an annular cooling chamber, and a chamber sealing cover with a funnel structure is arranged at the top end of the cooling chamber.

[0012] Further, the top of the mounting frame is fixedly provided with a feeding hopper, and the bottom discharge port of the feeding hopper extends into the inside of the top of the chamber sealing cover.

[0013] Further, the bottom of the lifting platform is further provided with a horizontal longitudinal positioning mechanism, the horizontal longitudinal positioning mechanism drives the horizontal longitudinal movement of the lifting platform, and the horizontal displacement direction of the lifting platform is perpendicular to the horizontal movement direction of the moving positioning plate.

[0014] Further, the rotating drive mechanism comprises a first drive motor fixedly arranged on one side of the top surface of the mounting frame and a driven gear fixedly arranged outside the top of the rotating die, and a driving gear engaged with the driven gear for transmission is fixedly connected to the output shaft end of the first drive motor.

[0015] Further, the pressing mechanism comprises an annular lower pressing plate arranged outside the top of the rotating die and located at the top of the driven gear, and an annular upper pressing plate arranged outside the top of the rotating die and located at the bottom of the driven gear, a hydraulic cylinder is fixedly arranged on the top of the mounting frame, the output shaft end of the hydraulic cylinder is fixedly connected to the top of the annular lower pressing plate, and a plurality of second springs are arranged between the bottom surface of the annular upper pressing plate and the top surface of the moving positioning plate.

[0016] Further, the automatic feeding mechanism comprises a second drive motor fixedly arranged on the top of the mounting frame and a spiral feeding rod coaxially arranged in the rotating die and fixedly connected to the output shaft end of the second drive motor, and the outer side surface of the spiral blade of the spiral feeding rod is in sliding contact with the inner wall surface of the rotating die.

[0017] Further, a feeding port opening and closing block is rotatably connected to the bottom end of the spiral feeding rod, at least one vertical sliding groove is formed in the outer wall of the feeding port opening and closing block, a synchronous sliding block is fixedly arranged on the inner wall bottom end of the rotating die and slidably embedded in the sliding groove, and when the rotating die is located at the lowest position, the bottom surface of the rotating die is flush with the bottom surface of the feeding port opening and closing block.

[0018] Further, the feeding port opening and closing block and the bottom surface of the rotating die are both provided with a wear-increasing structure.

[0019] A powder point-by-point high-pressure torsion consolidation type additive process is also provided, comprising the following steps:

[0020] S1, setting the operation parameters of the equipment according to the forming characteristics of the metal powder to be processed;

[0021] S2, sufficient metal powder to be processed is put into the automatic feeding mechanism, the automatic feeding mechanism is debugged to uniformly feed out the metal powder, and the equipment is started to operate;

[0022] S3, the lifting platform is raised to the bottom surface of the dynamic die assembly in contact with the forming operation reference surface;

[0023] S4, the pressure mechanism drives the rotating die to rise, the automatic feeding mechanism continuously feeds into the bottom forming cavity of the rotating die to a preset time, and then stops working;

[0024] S5, the pressure mechanism drives the rotating die to move downward, the rotating drive mechanism drives the rotating die to rotate at a preset rotating speed, and the rotating die applies a preset pressure and torque to the bottom metal powder;

[0025] S6, after the single deposition point torsion pressure forming reaches a preset time, the lifting platform moves downward by a preset vertical distance, the horizontal transverse positioning mechanism drives the forming die assembly to move horizontally by a preset distance, and the steps S4 and S5 are repeated to complete the torsion pressure forming of the next deposition point;

[0026] S7, repeating step S6, completing the cross connection forming of multiple deposition points to form a single material layer;

[0027] S8, the lifting platform moves downward by a thickness of a single material layer, and steps S4 to S7 are repeated to form a new material layer on the top of the formed material layer;

[0028] S9, repeating step S8 until the material layer reaches a preset number of layers, the equipment is reset and stopped, and the torsion pressure formed part is taken out.

[0029] Further, in step S6, after the single deposition point torsion pressure forming reaches a preset time, the horizontal transverse positioning mechanism drives the forming die assembly to move horizontally by a preset distance, which is 1 / 5 to 4 / 5 of the contour size of the formed single deposition point.

[0030] Further, before the horizontal transverse positioning mechanism drives the forming die assembly to move horizontally, the side wall of the forming cavity is in an open state on the side opposite to the horizontal moving direction of the forming die assembly.

[0031] Further, in step S5, the preset torsion pressure forming pressure is 2-10GPa, and the rotating speed of the rotating die is further, the material qualities of the metal powders of different deposition points in the same single material layer are partially different or totally different.

[0032] Compared with the prior art, the present application has the following advantages:

[0033] The present application realizes in-situ integration of coaxial powder feeding deposition technology and high-pressure torsion technology by setting an automatic feeding mechanism in a rotary die, adopts a process of layer-by-layer deposition and single-layer multi-point cross deposition, and can eliminate defects such as pores and cracks in the process of torsion and pressure forming, refine the grain structure and improve the density.

[0034] 2. Based on the three-dimensional digital model of the component, the present application adopts a gradual execution strategy of 'point-by-point cross deposition torsion + layer-by-layer deposition', solves the problem of uneven deformation of the sample edge and center in the whole large-size torsion and pressure forming process, and can complete the torsion and pressure forming work at room temperature, with the advantages of low heat input and low residual stress.

[0035] 3. The present application sets a movable die assembly on the outside of the rotary die, integrates horizontal positioning, vertical feeding and horizontal torsion mechanism, realizes the organic synergy of modular functions, realizes the alternative operation of deposition point feeding and high-pressure torsion, eliminates the deposition gap and improves the forming efficiency.

[0036] 4. The present application uses a multi-drive programmable control system and a parameter partition control mechanism to realize independent driving of the screw powder feeding control and the torsion head speed, meets different component pressure and torsion parameters, and can meet the point deposition torsion forming of different component metal powder, realize the spatial multi-point interlacing structure form of the sample internal space, and realize the precise regulation and control of the full-scale performance from macro geometry to microstructure.

[0037] 5. The present application can realize the mechanical alloying of materials by mixing different metal powders / forming complex alloy components, realize the local point area super grain structure of the material by high-pressure torsion, realize the high-strength combination of heterogeneous materials, improve the service reliability of the material in extreme environment, realize the simple forming of complex components, realize the overturning manufacturing capacity of 'printing, densification and strengthening' at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 It is a three-dimensional structure schematic diagram of the powder point-by-point high-pressure torsion consolidation type additive device of the present application.

[0039] Figure 2 It is a front view structure schematic diagram of the powder point-by-point high-pressure torsion consolidation type additive device of the present application.

[0040] Figure 3 It is a side view structure schematic diagram of the powder point-by-point high-pressure torsion consolidation type additive device of the present application.

[0041] Figure 4One of the three-dimensional structural diagrams of the mobile positioning frame and its functional components in the tissue culture state;

[0042] Figure 5 The second three-dimensional structural diagram of the mobile positioning frame and its functional components in the tissue culture state;

[0043] Figure 6 A side view of the mobile positioning frame and its functional components in the culture state;

[0044] Figure 7 for Figure 6 A schematic diagram of the cross-sectional structure at position AA in the middle;

[0045] Figure 8 This is one of the three-dimensional structural schematic diagrams of the forming module;

[0046] Figure 9 This is the second three-dimensional structural schematic diagram of the forming module;

[0047] Figure 10 A three-dimensional structural diagram showing the assembled state of the rotating mold and the chamber sealing cover;

[0048] Figure 11 This is a schematic diagram showing the interaction state between the moving mold assembly and the previous deposition point during the forming process;

[0049] Figure 12 for Figure 7 Enlarged structural diagram of section C;

[0050] Figure 13 This is a three-dimensional structural diagram of the rotation drive mechanism;

[0051] Figure 14 A three-dimensional structural diagram of the pressurizing mechanism;

[0052] Figure 15 This is a three-dimensional structural diagram of the automatic feeding mechanism;

[0053] Figure 16 for Figure 15 Enlarged structural diagram of section B in the middle;

[0054] Figure 17 For corresponding Figure 1 A schematic diagram of the forming process of the powder point-by-point high-pressure torsion consolidation additive manufacturing process in the embodiment;

[0055] Figure 18 A three-dimensional structural schematic diagram of a powder point-by-point high-pressure torsion consolidation additive manufacturing device according to another embodiment;

[0056] Figure 19 For corresponding Figure 18Fig. 1 is a schematic diagram of the forming process of the powder point-by-point high-pressure torsion consolidation type additive process of the embodiment in the present application.

[0057] Fig. 1 is a schematic diagram of the forming process of the powder point-by-point high-pressure torsion consolidation type additive process of the embodiment in the present application. Fig. 1 is a schematic diagram of the forming process of the powder point-by-point high-pressure torsion consolidation type additive process of the embodiment in the present application. Fig. 1 is a schematic diagram of the forming process of the powder point-by-point high-pressure torsion consolidation type additive process of the embodiment in the present application. DETAILED DESCRIPTION

[0058] The advantages and features of the present application will become more apparent from the following detailed description of preferred embodiments when taken in conjunction with the drawings, in which:

[0059] It should be noted that when an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements can be present. When an element is referred to as being "positioned on" another element, it can be directly positioned on the other element or intervening elements can be present. When an element is referred to as being "fixed to" another element, it can be directly fixed to the other element or intervening elements can be present.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. All publications, patent applications, patents, and other references mentioned herein are incorporated by reference in their entirety.

[0061] Reference will now be made to the drawings to describe the preferred embodiments of the present application. Figures 1 to 3The application discloses a powder point-by-point high-pressure torsion consolidation type additive device which comprises a support frame 1, a lifting platform 2 arranged at the bottom of the inner side of the support frame 1 and a horizontal transverse positioning mechanism 4 arranged at the top of the support frame 1. The support frame 1 is welded by a metal base frame at the bottom, columns at the two sides of the top surface of the metal base frame and a cross beam at the top of the columns, and the metal base frame, the columns and the cross beam are all made of square steel profiles. A motor-driven push cylinder mounting seat 301 is arranged at the center of the top surface of the metal base frame, a servo motor-driven motor-driven push cylinder 3 is fixedly arranged in the motor-driven push cylinder mounting seat 301, the output shaft of the motor-driven push cylinder 3 is vertically upward, and the end is fixedly connected with the bottom surface of the lifting platform 2. In the embodiment, the resolution of the motor-driven push cylinder 3 is 0.01 mm, the rated pushing force is 2.5 kN, and the top surface of the lifting platform 2 serves as a working surface for the pressure-torsion forming operation. In this way, the lifting platform 2 can be vertically lifted by the motor-driven push cylinder 3, and the height of the lifting platform 2 can be accurately adjusted, so that the position adjustment between the top surface of the lifting platform 2 and the forming die set 6 is realized, and the forming needs of the deposition points of each layer are met. Meanwhile, a guide column 302 between the columns is fixedly arranged between the metal base frame and the cross beam, and the four corners of the lifting platform 2 are sleeved with linear bearing sleeves outside the guide column 302, so that the lifting movement of the lifting platform 2 is guided, and the lifting platform 2 is kept stable. The horizontal transverse positioning mechanism 4 is composed of a transverse linear module driven by a servo motor, a transverse sliding rail and a transverse sliding block, the transverse linear module and the transverse sliding rail are arranged on the top surfaces of the two cross beams in parallel with each other and are fixedly connected by bolts, and the transverse sliding block is slidingly arranged on the transverse sliding rail.

[0062] The top positioning output end of the horizontal transverse positioning mechanism 4 is fixedly connected with a moving positioning plate 5, the top of the moving positioning plate 5 is fixedly provided with a mounting frame 501, and the bottom of the moving positioning plate 5 is connected with a forming die set 6 above the lifting platform 2, as shown in Figures 4 to 7 . Specifically, the bottom surface of the moving positioning plate 5 is fixedly connected with the top surface of the nut block of the transverse linear module and the top surface of the transverse sliding block by bolts. The mounting frame 501 is in an arc shape, and the two sides of the bottom thereof are fixedly connected to the top surface of the moving positioning plate 5 by bolts. In this way, through the driving of the transverse linear module and the guiding of the transverse sliding rail, the stable and synchronous movement and accurate positioning of the moving positioning plate 5, the mounting frame 501 and the forming die set 6 on the moving positioning plate 5 in the horizontal transverse direction (X direction) can be realized. Figure 1

[0063] Figure 8 and Figure 9 ​​As shown, the forming die set 6 includes a cylinder body 601 fixedly arranged at the bottom of the movable positioning plate 5, a rotating die 602 coaxially arranged in the cylinder body 601, and a movable die assembly 603 slidingly sleeved outside the bottom end of the rotating die 602. Specifically, the top end outside of the cylinder body 601 is integrally provided with a connecting flange, which is fixedly connected to the bottom surface of the movable positioning plate 5 by screws, and the bottom end of the rotating die 602 protrudes below the bottom surface of the cylinder body 601. As shown in Figure 7 As shown, the cylinder body 601 is embedded with a thrust bearing 610, the bottom of the outer cylindrical surface of the rotating die 602 is provided with a shaft shoulder, the bottom section of the rotating die 602 is inserted into the upper thrust washer of the thrust bearing 610 and vertically positioned by the shaft shoulder, and the outer wall of the rotating die 602 and the inner wall of the upper thrust washer are gap-fitted, so that the rotating die 602 can be rotationally assembled in the cylinder body 601, and the rotating die 602 can be freely lifted and moved vertically relative to the cylinder body 601.

[0064] Preferably, the rotating die 602 is internally provided with an annular cooling chamber 6021, and the top end of the cooling chamber 6021 is provided with a chamber sealing cover 604 of a funnel structure. Specifically, as shown in Figure 10 As shown, the rotating die 602 is a hollow cylindrical structure through the top and bottom, wherein the hollow part serves as a feeding channel for the metal powder to be processed, and the cooling chamber 6021 is coaxially arranged in the annular side wall of the rotating die 602, so that the wall thickness of the inside and outside of the cooling chamber 6021 is the same, the heat dissipation effect is relatively uniform everywhere, and the vertical height of the inside side wall of the cooling chamber 6021 is lower than that of the outside side wall. The bottom end surface of the side wall of the chamber sealing cover 604 is in contact with the top end surface of the inside side wall of the cooling chamber 6021, the top end outside of the side wall of the chamber sealing cover 604 is integrally provided with a connecting flange, the bottom surface of the connecting flange is overlapped on the top end end surface of the outside side wall of the cooling chamber 6021 (i.e. the top surface of the rotating die 602), and is fixedly connected by screws. In this way, the cooling chamber 6021 below the chamber sealing cover 604 is a closed cavity. Preferably, a rubber sealing gasket is arranged at the contact position of the chamber sealing cover 604 and the rotating die 602 to improve the sealing effect and prevent the cooling water from leaking into the feeding channel or overflowing onto other structural members of the forming die set 6.

[0065] The upper and lower ends of the outer wall outside the closed cavity are respectively provided with a water outlet and a water inlet, and the cooling water of the water cooling circulation system is sent into through the water inlet to timely absorb the heat generated by the bottom of the rotating compression mold 602 during the compression and torsion forming process, and then flows back to the water cooling circulation system from the water outlet, so that the working position of the bottom of the rotating compression mold 602 can be kept in an optimal performance state, and the heat generated during the torsion and compression forming operation of the rotating compression mold 602 can be prevented from being conducted upward, thereby ensuring that the hollow part of the rotating compression mold 602, i.e., the feeding channel, remains in a stable non-high-temperature state, and the flowability of the metal powder to be processed in the feeding channel during the entire additive manufacturing process can be well guaranteed, especially for fine powder.

[0066] The chamber sealing cover 604 has a funnel-shaped structure, so that the inner diameter of the top cylindrical barrel is greater than the inner diameter of the bottom end of the bottom conical barrel, and the top end of the top cylindrical barrel protrudes above the top surface of the mounting frame 501 to facilitate feeding of the metal powder to be processed. For this purpose, a through hole is formed in the top surface of the mounting frame 501, and the diameter of the through hole is appropriate so as not to hinder the free rotation of the rotating compression mold 602 and the chamber sealing cover 604. At the same time, the inner diameter of the bottom end of the bottom conical barrel is not greater than the inner diameter of the feeding channel, so that the metal powder fed into the chamber sealing cover 604 can completely enter the feeding channel.

[0067] The movable mold assembly 603 is formed by a plurality of movable mold units adjacent to each other in sequence to form a closed ring structure, and each movable mold unit can independently move vertically. Specifically, as shown in Figure 9 In this embodiment, the number of movable mold units is preferably 12, and the specifications of each movable mold unit are the same, i.e., the central angle of the cross-sectional sector of each movable mold unit is 360° / 12=30°, and the 12 movable mold units are symmetrically distributed on both sides of the horizontal movement direction of the rotating compression mold 602. In this way, after completing the compression and torsion forming of the previous deposition point, the rotating compression mold 602 moves horizontally by a predetermined horizontal offset distance and is again at the forming position of the next deposition point, and since the two deposition point planes partially overlap, the bottom end of the movable mold unit at the rear end is overlapped on the top surface of the previously formed deposition point, and the remaining movable mold units are combined with the side surface of the previously formed deposition point to form a new closed ring, thereby forming a new forming chamber with the bottom surface of the rotating compression mold 602 and the top surface of the lifting platform 2 / the top surface of the lower material layer, as shown in Figure 11As shown, the number of the movable die units in this embodiment is 12, and each movable die unit has the same specification. The number of the movable die units can be set according to actual conditions, and the specifications of the movable die units can also be different in other application scenarios, for example, the direction of point-by-point deposition is a one-way straight line, and then the six movable die units corresponding to the front side of the moving direction of the rotating die 602 can be designed as an integral structure and fixedly connected with the barrel 601.

[0068] As shown in FIG. 1, the movable die assembly 603 is arranged on the top surface of the lifting platform 2, and the rotating die 602 is arranged on the movable die assembly 603. Figure 12 As shown, the movable die assembly 603 further includes a hoop 608 coaxially sleeved on the outside of the rotating die 602 and fixedly connected to the bottom surface of the barrel 601. The side wall of the hoop 608 is provided with a guide slot 6081 corresponding to each movable die unit. The outer side wall of the movable die unit is fixedly connected with a connecting rod 605 movably arranged in the guide slot 6081. One end of the connecting rod 605 located on the outside of the movable die unit is fixedly connected with a connecting block 606. The top surface of the connecting block 606 is connected with the bottom surface of the top wall of the hoop 608 through a first spring 607.

[0069] Specifically, the top end of the hoop 608 is integrally provided with a connecting flange, which is fixedly connected to the bottom surface of the barrel 601 through bolts. The inner wall diameter of the hoop 608 matches the outer diameter of the movable die assembly 603, and the bottom end outer wall diameter of the rotating die 602 matches the inner diameter of the movable die assembly 603, so as to realize the radial limiting of the movable die assembly 603. The guide slot 6081 is a vertically arranged waist-shaped slot, and the connecting rod 605 is a cylindrical rod, the diameter of which matches the slot width dimension of the waist-shaped slot, and the inner side end is provided with a threaded end and is threadedly connected with the outer wall of the movable die unit. The outer side end is a non-circular cross-section plug connector structure. The inner side surface of the connecting block 606 is provided with a plug connector hole matched with the plug connector structure. The plug connector hole and the plug connector are plug-connected to realize the non-rotatable and detachable assembly of the connecting block 606 on the connecting rod 605. The outer side end of the connecting block 606 is provided with a bolt through hole, and a guide bolt 609 is arranged in the bolt through hole. The connecting section of the guide bolt 609 is threadedly connected to the bottom surface of the top connecting flange of the hoop 608, and the first spring 607 is sleeved on the outside of the guide bolt 609, so that the first spring 607 will not be bent during the stretching and contracting process. In the non-working state, the first spring 607 is in a free state or a compressed state, so that the connecting rod 605 is located at the lowest end position of the guide slot 6081. In this state, the bottom surface of the annular closed structure of the movable die assembly 603 is located below the bottom surface of the rotating die 602. When the bottom surface of the movable die assembly 603 contacts the top surface of the lifting platform 2, a torsional forming cavity is formed below the bottom surface of the rotating die 602.

[0070] In order to monitor the temperature of the material during the deposition process, preferably, at least one infrared thermal imager is fixedly arranged on the outer wall of the hoop cylinder 608 between two adjacent connecting blocks 606, the resolution of the infrared thermal imager is 320*240, and the detection position is vertically arranged downward and located near the top surface of the deposition point. By collecting thermal images in real time, the temperature of the working surface is monitored to help adjust the process parameters.

[0071] The top of the mounting frame 501 is fixedly provided with a rotation driving mechanism 7 for driving the horizontal rotation of the rotating die 602, a pressing mechanism 8 for driving the vertical lifting of the rotating die 602, and an automatic feeding mechanism 9 located inside the rotating die 602.

[0072] Specifically, as shown in Figure 13 In this embodiment, the rotation driving mechanism 7 includes a first driving motor 701 fixedly arranged on one side of the top surface of the mounting frame 501 and a driven gear 702 fixedly arranged on the outside of the top of the rotating die 602. The output shaft end of the first driving motor 701 is fixedly connected with a driving gear 703 which is in meshing transmission with the driven gear 702. Specifically, the top of the rotating die 602 is integrally provided with a connecting ring disc 6022, the middle part of the driven gear 702 is a hollow structure, the driven gear 702 is coaxially sleeved on the outside of the rotating die 602 and located above the connecting ring disc 6022, and the end face of the driven gear 702 is fixedly connected with the connecting ring disc 6022 through screws, so that the rotating die 602 can synchronously rotate with the driven gear 702. Since the metal powder needs to be vertically moved a certain distance during the filling stage before torsion pressing forming, so as to temporarily increase the space at the bottom of the rotating die 602 and make the metal powder fully filled, and then the metal powder is pressed downward to perform torsion pressing forming, the driven gear 702 will synchronously lift and descend with the rotating die 602 during this process. In order to ensure that the driven gear 702 and the driving gear 703 maintain an accurate meshing relationship, the axial thickness (tooth width) of the driving gear 703 is greater than the axial thickness of the driven gear 702, and the thickness difference is not less than the lifting and descending distance of the rotating die 602 / driven gear 702.

[0073] Obviously, the rotation driving mechanism 7 can also use a belt transmission mechanism, a chain rotation mechanism, a crank connecting rod mechanism, a gear and rack, and other power mechanisms with continuous output rotation driving power.

[0074] As shown in Figure 14As shown, in the embodiment, the pressing mechanism 8 comprises an annular lower pressing plate 801 arranged outside the top of the rotating die 602 and on the top of the driven gear 702, an annular upper pressing plate 802 arranged outside the top of the rotating die 602 and on the bottom of the driven gear 702, and a hydraulic cylinder 803 fixedly arranged on the top of the mounting frame 501, with the output shaft end of the hydraulic cylinder 803 fixedly connected to the top of the annular lower pressing plate 801, and a plurality of second springs 804 arranged between the bottom surface of the annular upper pressing plate 802 and the top surface of the movable positioning plate 5. Specifically, the hydraulic cylinder 803 is arranged in two and symmetrically distributed on both sides of the axis of the rotating die 602, so that the synchronous output of hydraulic pressure by the two hydraulic cylinders 803 can drive the annular lower pressing plate 801 to move downward stably, thereby providing a stable downward pressure on the rotating die 602, and the output force of the hydraulic cylinder 803 can be adjusted to correspondingly adjust the downward pressure of the rotating die 602 on the metal powder on the bottom thereof. A plurality of (three in the embodiment) circumferentially uniformly distributed guide rods 805 are fixedly arranged on the bottom surface of the annular upper pressing plate 802, with the bottom ends of the guide rods 805 movably penetrating into the movable positioning plate 5, and the second springs 804 are sleeved outside the guide rods 805.

[0075] When the hydraulic cylinder 803 pushes the driven gear 702 / rotating die 602 to move downward through the annular lower pressing plate 801, the annular upper pressing plate 802 and the guide rods 805 are synchronously moved downward by the driven gear 702, and the second springs 804 are compressed to store energy until the rotating die 602 moves downward to the lowest position, and the metal powder torsion forming process is completed. After the torsion forming process is completed, the two hydraulic cylinders 803 are synchronously reversely operated to lift the annular lower pressing plate 801 upward, and the restoring force of the second springs 804 pushes the annular upper pressing plate 802 to move upward to reset, and the annular upper pressing plate 802 lifts the driven gear 702 upward, so that the rotating die 602 moves upward to reset. At this time, the vertical distance between the bottom surface of the rotating die 602 and the bottom surface of the movable die assembly 603 is increased, so that the volume of the bottom forming cavity is increased, and the volume increase amount is equal to the volume reduction amount of the final formed part after the metal powder is torsionally pressed and formed. Preferably, in order to prevent the annular upper pressing plate 802 from interfering with the driving gear 703 during the lifting process, an arc-shaped notch is formed on the outer edge of the annular upper pressing plate 802 close to the driving gear 703, so that the driving gear 703 can slide through the arc-shaped notch.

[0076] Further preferably, a pressure sensor is arranged on the bottom surface of the annular lower pressing plate 801, for monitoring the pressure applied on the rotating die 602 in real time, and feeding the detected value to the control system of the device, which compares the actual pressure value with the set target value, so as to adjust the output force of the hydraulic cylinder 803, so that the detected value is finally stabilized at the target value, realizing closed-loop control. Meanwhile, a torque sensor is arranged between the outer wall of the rotating die 602 and the inner wall of the cylinder body 601, for detecting the actual torque value of the rotating die 602, and feeding the detected value to the control system of the device, which compares the actual torque value with the set target value, so as to adjust the output torque of the first driving motor 701, so that the detected value is finally stabilized at the target value, realizing closed-loop control.

[0077] Obviously, the pressing mechanism 8 can also adopt other power mechanisms with continuous output linear driving force, such as electric push cylinder, crank slider, gear rack, cam connecting rod, etc.

[0078] As shown in Figure 15 The automatic feeding mechanism 9 includes a second driving motor 901 fixedly arranged on the top of the mounting frame 501, and a spiral feeding rod 902 fixedly connected to the output shaft end of the second driving motor 901 and coaxially arranged in the rotating die 602, the outer side surface of the spiral blade of the spiral feeding rod 902 being in sliding contact with the inner wall surface of the rotating die 602 (the inner wall of the feeding channel). Specifically, the top of the mounting frame 501 is fixedly connected with a motor mounting frame 904 through bolts, the second driving motor 901 is fixedly mounted on the top of the motor mounting frame 904, and the output shaft thereof is coaxially arranged vertically downward with the rotating die 602, and the output shaft is drivingly connected to the top end of the spiral feeding rod 902 through a shaft coupling. The second driving motor 901 adopts a servo motor, which can accurately control the number of rotations of the spiral feeding rod 902, so as to accurately control the volume of the fed metal powder. The outer side surface of the spiral blade is in sliding contact with the inner wall surface of the rotating die 602, which can realize coaxial positioning of the spiral feeding rod 902 in the rotating die 602, and will not interfere with the horizontal rotation of the rotating die 602, and can also avoid that the metal powder directly falls from the top end to the bottom end of the feeding channel. Preferably, a feeding hopper 903 is fixedly arranged on the top of the mounting frame 501, and the bottom discharge port of the feeding hopper 903 extends into the inside of the top of the chamber sealing cover 604 (i.e. inside the top end of the feeding channel), so that the feeding operation of the metal powder can be conveniently realized from the topmost part of the device.

[0079] Since the bottom end of the feeding channel in the rotating die 602 needs to be in an open-through state during the metal powder feeding stage before the twist compression forming, and needs to be in a closed state during the twist compression forming stage to prevent the metal powder in the feeding channel from continuing to fall and to provide a cavity surface for the forming area corresponding to the bottom end of the feeding channel, in the embodiment, the bottom end of the spiral feeding rod 902 is rotationally connected with a feeding port opening and closing block 905. Specifically, as shown in Figure 16 the bottom of the feeding port opening and closing block 905 is a conical frustum structure, the outer circle diameter of the conical frustum is the same as the inner wall diameter of the feeding channel, the top surface of the conical frustum is integrally provided with a shaft rod, and the top end of the shaft rod is integrally provided with a rotating joint in a spherical structure. A spherical groove matched with the spherical structure is formed in the bottom surface of the rod body of the spiral feeding rod 902, the rotating joint is rotatably inserted into the spherical groove, and a connecting nut cap 907 is movably sleeved outside the rotating joint and the shaft rod. The connecting nut cap 907 is threadedly connected to the bottom end of the rod body of the spiral feeding rod 902, so that the spiral feeding rod 902 is rotatably connected to the bottom end of the spiral feeding rod 902. Obviously, other rotationally connecting modes can also be used to achieve the same rotationally connecting effect.

[0080] The outer wall (the outer cylindrical surface of the conical frustum) of the feeding port opening and closing block 905 is provided with at least one (four in this embodiment) vertical chute, and the inner wall bottom end of the rotating die 602 is fixedly provided with a synchronous sliding block 906 slidingly embedded in the chute. During the metal powder feeding stage before torsion compression forming, the output rod of the hydraulic cylinder 803 is in a retracted state, at which time the rotating die 602 is in the highest position of its lifting stroke in the vertical direction, i.e. the bottom surface of the rotating die 602 is above the conical surface of the conical frustum, so that the bottom end of the feeding channel is in an open state (the inner side top end of the synchronous sliding block 906 is in an embedded state with the bottom end of the chute). During the continuous feeding process of the metal powder driven by the second drive motor 901 rotating the screw feeding rod 902, the metal powder falls from the screw blade, is uniformly scattered to the bottom of the forming chamber of the rotating die 602 through the conical surface of the conical frustum, and then the torsion compression forming stage after the feeding is completed. The hydraulic cylinder 803 drives the rotating die 602 to gradually move downward, and the synchronous sliding block 906 moves upward relative to the chute to gradually increase the embedding degree between them. During the gradual downward movement of the rotating die 602, the rotating drive mechanism 7 also drives the rotating die 602 to continuously rotate. The metal powder below the bottom surface of the rotating die 602 in the forming chamber naturally fills the central area of the forming chamber (the area below the feeding port opening and closing block 905) under the forming pressure. Through the cooperation of the synchronous sliding block 906 and the chute and the rotating connection relationship between the feeding port opening and closing block 905 and the screw feeding rod 902, the feeding port opening and closing block 905 and the rotating die 602 can always be kept in a synchronous rotating relationship, realizing the synchronous torsion compression forming of the entire area of the metal material on the top of the entire compression-torsion forming chamber. When the hydraulic cylinder 803 drives the rotating die 602 to move downward to the lowest position, the bottom surface is flush with the bottom surface of the feeding port opening and closing block 905, and then the top surface of the metal material can be integrally torsion-compressed and trimmed.

[0081] Preferably, the bottom surfaces of the feeding port opening and closing block 905 and the rotating die 602 are provided with abrasive structures. The abrasive structures include but are not limited to wavy curved surfaces, net-like stripes, spherical protrusions and the like, so as to enhance the torsional force of the mold surface on the metal material surface during rotation and enhance the overall toughness of the surface of the formed part.

[0082] A powder point-by-point high-pressure torsion consolidation type additive process is also provided, which is applied to a powder point-by-point high-pressure torsion consolidation type additive device as shown in Figure 1 When applied to the powder point-by-point high-pressure torsion consolidation type additive device as shown in Figure 18 The powder point-by-point high-pressure torsion consolidation type additive process comprises the following steps:

[0083] S1, setting the operating parameters of the equipment according to the forming characteristics of the metal powder to be processed.

[0084] To ensure smooth automatic feeding of metal powder and high-quality forming of the parts, the metal powder to be processed requires strict pretreatment. A suitable substrate (fixed on or embedded in the top surface of the lifting platform 2, serving as the adhesion reference surface for deposition points) must be selected. Impurities affecting the bonding of materials at deposition points are removed through mechanical grinding and chemical cleaning. The material composition and properties are tested. Simultaneously, the forming module 6, lifting platform 2, substrate, and other forming-related structures are cleaned, and the working environment is kept clean to ensure processing quality. Precise calibration of parameters such as pressure, torque, and speed is performed on the equipment. Specific operating parameters are set for different metal powders based on their characteristics and forming process requirements.

[0085] S2. Add sufficient amount of the metal powder to be processed into the automatic feeding mechanism 9, adjust the automatic feeding mechanism 9 until the metal powder is fed out evenly, and start the equipment.

[0086] Given a fixed feeding capacity (feeding volume per unit time) of the automatic feeding mechanism 9, the volume change ratios before and after compression forming of metal powders with different material compositions are not the same. Therefore, for each deposition point in the same deposition material layer, in order to ensure that the vertical height of each deposition point is consistent after compression forming, the material volume fed into each deposition point forming position is a fixed value for metal powders with the same material composition, while for metal powders with different material compositions, the material volume fed in needs to be adjusted accordingly.

[0087] S3. The lifting platform 2 rises until the forming operation reference surface contacts the bottom surface of the moving mold assembly 603. Specifically, the top surface of the substrate matching the metal material of the selected bottom layer of the processing is used as the forming operation reference surface. The positioning of the forming operation reference surface is detected by setting a proximity switch (such as a Hall effect proximity switch or a photoelectric proximity switch) on any component of the forming module 6, or by setting a pressure sensor or limit switch at the bottom of the moving mold unit. The contact position between the forming operation reference surface and the bottom surface of the moving mold assembly 603 is in the vertical direction. Figure 1 The zero-point starting machining position in the Z-axis direction is shown in the figure, and then the subsequent lifting and positioning of the lifting platform 2 are precisely controlled by the electric push cylinder 3 at the bottom.

[0088] S4, the pressing mechanism 8 drives the rotating die 602 to rise, the automatic feeding mechanism 9 continuously feeds into the bottom forming cavity of the rotating die 602 to a preset time length, and then stops working. As described above, after the pressing mechanism 8 drives the rotating die 602 to rise, the volume of the forming cavity at the bottom increases to meet the needs of sufficient filling of the powder (in a loose state, the volume is larger than the volume in the compressed state after torsional compaction), and at the same time, the bottom end of the feeding channel is in an open state to meet the needs of discharging. The metal powder at different deposition points of the same single layer of material has different or all different material qualities to achieve the cross deposition forming of the spatial point interlaced structure of a single material or a compatible material. For metal powder with determined components (pure material or mixed material), the volume compression ratio before and after torsional compaction is determined. In order to make the thickness of each torsional compaction deposition point the same, the preset single feeding volume is inversely calculated according to the compression ratio, and then by precisely controlling the feeding time of the automatic feeding mechanism 9 (the feeding amount per unit time is fixed), the total amount of single feeding can be within a reasonable threshold range.

[0089] S5, the pressing mechanism 8 drives the rotating die 602 to move downward, the rotating drive mechanism 7 drives the rotating die 602 to directionally rotate at a preset rotating speed, and the rotating die 602 applies a preset pressure and torque to the metal powder at the bottom. The bottom surface of the rotating die 602 applies a torsional pressure to the top of the metal powder to realize "single point" extrusion forming. Taking the formation of one kind of metal powder or mixed powder of multiple metal powders such as pure aluminum (Al), pure titanium (Ti), and aluminum-titanium alloy (such as Al-Mg-Ti) as an example, the preset torsional compaction pressure is 2-10 GPa, the rotating speed of the rotating die is 0.5-5 rad / min, and the number of single rotation is 0.5-2 turns.

[0090] S6, after the single deposition point is torsionally compacted to a preset time, the lifting platform 2 moves downward by a preset vertical distance, the horizontal transverse positioning mechanism 4 drives the forming die set 6 to move horizontally by a preset distance, and the steps S4 and S5 are repeated to complete the torsional compaction of the next deposition point. The lifting platform 2 moves downward by a preset vertical distance which is not less than the vertical height of the single deposition point of the layer, so that the deposition point can be completely removed from the forming cavity. Preferably, after the single deposition point is torsionally compacted to a preset time, the horizontal transverse positioning mechanism 4 drives the forming die set 6 to move horizontally by a preset distance which is 1 / 5 to 4 / 5 of the outline size of the single deposition point formed, so that there is a partial intersection between the forming areas of the front and rear deposition points, thereby connecting the deposition points formed by the front and rear two times into one body.

[0091] Preferably, when the intersection area of the next deposition point and the previous deposition point is greater than 1 / 2, i.e. the horizontal offset distance is less than 1 / 2 of the lateral size of the deposition point, since the bottom end of the rear die monomer always overlaps the top surface of the previous deposition point, i.e. before the horizontal transverse positioning mechanism 4 drives the forming die set 6 to move horizontally, the side wall of the forming cavity is in an open state at the side opposite to the horizontal moving direction of the forming die set 6 (i.e. the positive direction of the X axis), in this case, the lifting platform 2 can not be lowered, and the horizontal transverse positioning mechanism 4 directly drives the forming die set 6 to move horizontally, and the formed deposition point can be directly removed from the forming cavity through the opening at the rear side.

[0092] S7, repeat step S6 to complete the intersection connection forming of multiple deposition points to form a single-layer material layer with a single-row structure, and realize the forming processing of "connecting points to form a line". As shown in Figure 17 Fig. 4, it is a schematic diagram of the forming point profile when the forming intersection area of the adjacent two deposition points is 1 / 2.

[0093] S8, the lifting platform 2 is lowered by a thickness of a single-layer material layer, and steps S4 to S7 are repeated to stack and form a new material layer above the formed material layer.

[0094] S9, repeat step S8 until the material layer reaches the preset number of layers, reset the equipment and stop, and take out the torsion compression formed part.

[0095] As shown in Figure 18 Fig. 5, in another embodiment, the bottom of the lifting platform 2 is also provided with a horizontal longitudinal positioning mechanism 10, which is installed on a base plate 11 fixedly connected to the output rod top end of the electric push cylinder 3. The horizontal longitudinal positioning mechanism 10 includes a longitudinal linear module, a longitudinal sliding rail and a longitudinal sliding block driven by a servo motor, the longitudinal linear module and the longitudinal sliding rail are respectively arranged on the top surface of the base plate 11 in parallel and fixedly connected by bolts, and the longitudinal sliding block is slidingly arranged on the longitudinal sliding rail, and the bottom surface of the lifting platform 2 is fixedly connected to the top surface of the nut block of the longitudinal linear module and the top surface of the longitudinal sliding block by bolts. In this way, through the driving of the longitudinal linear module and the guidance of the longitudinal sliding rail, the stable movement and accurate positioning of the lifting platform 2 in the horizontal longitudinal direction (Y direction) can be realized. In this way, after the horizontal transverse positioning mechanism 4 drives the forming die set 6 to move horizontally and transversely and completes the torsion compression forming of multiple deposition points in a single row, the horizontal longitudinal positioning mechanism 10 can drive the forming die set 6 to move horizontally and longitudinally by a preset distance, and then complete the torsion compression forming of the next row of deposition points, so that multiple rows of deposition points are alternately connected to form a planar deposition material layer. Figure 1 and Figure 17 Fig. 6 shows the schematic diagram of the forming point profile when the forming intersection area of the adjacent two deposition points is 1 / 2.

[0096] The above process is applied to, for example, Figure 18The powder is shown on the point-by-point high-pressure torsion solidification type additive device, like Figure 19 As shown in step S7, the horizontal longitudinal positioning mechanism 10 drives the lifting platform 2 to offset the preset horizontal interval along the horizontal longitudinal direction (Y-axis direction), and then repeats the above steps S3 to S6 to complete the next row of single-layer material layer, realizes the "line-to-surface" forming processing. Then the above steps S8 and S9 are performed to form a large-volume formed part.

[0097] The technical features of the above-described embodiments can be combined in any way. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present disclosure.

[0098] The above-described embodiments are merely examples of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, based on the content of the specification and drawings of the present application, are also included in the patent protection scope of the present application.

Claims

1. A powder point-by-point high-pressure torsional consolidation type additive device comprising a support frame, a lifting platform arranged at the bottom of the inner side of the support frame, and a horizontal transverse positioning mechanism arranged at the top of the support frame, characterized in that: The top positioning output end of the horizontal transverse positioning mechanism is fixedly connected with a moving positioning plate, the top of the moving positioning plate is fixedly provided with a mounting rack, and the bottom of the moving positioning plate is connected with a forming die set located above the lifting table; The forming die set comprises a cylinder fixedly arranged at the bottom of the moving positioning plate, a rotating die rotatably arranged in the cylinder, and a movable die assembly slidably arranged outside the bottom end of the rotating die, the movable die assembly is formed in a closed ring structure by a plurality of movable die units arranged in sequence, and each movable die unit is vertically movable independently. The top of the mounting rack is fixedly provided with a rotating drive mechanism for driving the rotating die to rotate horizontally, a pressing mechanism for driving the rotating die to vertically move up and down, and an automatic feeding mechanism located in the rotating die. The automatic feeding mechanism comprises a second drive motor fixedly arranged at the top of the mounting rack, a spiral feeding rod coaxially arranged in the rotating die and fixedly connected to the output shaft end of the second drive motor, and the outer side surface of the spiral blade of the spiral feeding rod is in sliding contact with the inner wall surface of the rotating die. The bottom end of the spiral feeding rod is rotatably connected with a feeding port opening and closing block, at least one vertically arranged sliding groove is formed in the outer wall of the feeding port opening and closing block, and the inner wall bottom end of the rotating die is fixedly provided with a synchronous sliding block slidably arranged in the sliding groove. During the metal powder filling stage before torsion pressing forming, the pressing mechanism drives the rotating die to vertically move up by a certain distance, so that the space at the bottom of the rotating die is temporarily increased, the bottom end of the feeding channel in the rotating die is communicated with the inside of the movable die assembly and filled with metal powder; during the torsion pressing forming stage, the pressing mechanism drives the rotating die to vertically move down to the lowest position, the bottom surface of the rotating die is flush with the bottom surface of the feeding port opening and closing block, the bottom end of the feeding channel in the rotating die is closed and isolated from the inside of the movable die assembly, and the metal powder is prevented from continuously falling.

2. The powder point-by-point high-pressure torsional solidification type additive device according to claim 1, characterized by: The movable die assembly further comprises a hoop coaxially arranged outside the rotating die and fixedly connected to the bottom surface of the cylinder, guide grooves corresponding to each movable die unit are formed in the side wall of the hoop, a connecting rod movably arranged in the guide groove is fixedly connected to the outer side wall of the movable die unit, a connecting block is fixedly connected to one end of the connecting rod located outside the movable die unit, and a first spring is connected between the top surface of the connecting block and the bottom surface of the top wall of the hoop.

3. The powder point-by-point high-pressure torsional solidification type additive device according to claim 1, characterized by: The inside of the rotating die is provided with an annular cooling chamber, and the top end of the cooling chamber is provided with a chamber sealing cover in the form of a funnel structure.

4. The powder point-by-point high-pressure torsional solidification type additive device according to claim 3, characterized by: The top of the mounting rack is fixedly provided with a feeding hopper, and the bottom end discharge port of the feeding hopper extends into the inside of the top of the chamber sealing cover.

5. The powder point-by-point high-pressure torsional solidification additive device according to claim 1, characterized in that: The bottom of the lifting table is further provided with a horizontal longitudinal positioning mechanism, the horizontal longitudinal positioning mechanism drives the lifting table to move horizontally and longitudinally, and the horizontal displacement direction of the lifting table is perpendicular to the horizontal movement direction of the moving positioning plate.

6. The powder point-by-point high-pressure torsional solidification type additive device according to any one of claims 1 to 5, characterized by: The rotating drive mechanism comprises a first drive motor fixedly arranged on one side of the top surface of the mounting rack and a driven gear fixedly arranged outside the top of the rotating die, and the output shaft end of the first drive motor is fixedly connected with a driving gear in meshing transmission with the driven gear.

7. The powder point-by-point high-pressure torsional solidification type additive device according to claim 6, characterized by: The pressing mechanism comprises an annular lower pressing plate arranged outside the top of the rotating die and located at the top of the driven gear, and an annular upper pressing plate arranged outside the top of the rotating die and located at the bottom of the driven gear.

8. The powder point-by-point high-pressure torsional solidification additive device according to claim 1, characterized by: The feeding opening opening and closing block and the bottom surface of the rotating die are both provided with abrasion-increasing structures.

9. A powder point-by-point high-pressure torsional consolidation additive process applied to the powder point-by-point high-pressure torsional consolidation additive device according to any one of claims 1 to 8, characterized in that, The method comprises the following steps: S1, setting the operation parameters of the equipment according to the forming characteristics of the metal powder to be processed; S2, feeding the metal powder to be processed into the automatic feeding mechanism, adjusting the automatic feeding mechanism to uniformly feed out the metal powder, and starting the equipment to operate; S3, the lifting platform is raised to the bottom surface of the movable die assembly; S4, the pressing mechanism drives the rotating die to rise, and the automatic feeding mechanism continuously feeds the metal powder into the bottom forming cavity of the rotating die for a preset time, and then stops working; S5, the pressing mechanism drives the rotating die to move downward, and the rotating drive mechanism drives the rotating die to rotate at a preset speed, and the rotating die applies a preset pressure and torque to the metal powder at the bottom; S6, after the single deposition point is torsionally pressed and formed for a preset time, the lifting platform moves downward by a preset vertical distance, the horizontal transverse positioning mechanism drives the forming die assembly to move horizontally by a preset distance, and the steps S4 and S5 are repeated to complete the torsional pressing and forming of the next deposition point; S7, the step S6 is repeated to complete the cross connection forming of multiple deposition points to form a single material layer; S8, the lifting platform moves downward by a thickness of a single material layer, and the steps S4 to S7 are repeated to form a new material layer on the formed material layer; S9, the step S8 is repeated until the material layer reaches a preset number of layers, the equipment is reset and stopped, and the torsionally pressed and formed part is taken out.

10. The powder point-by-point high-pressure torsional solidification additive process according to claim 9, characterized in that: In the step S6, after the single deposition point is torsionally pressed and formed for a preset time, the horizontal transverse positioning mechanism drives the forming die assembly to move horizontally by a preset distance, which is 1 / 5 to 4 / 5 of the size of the outer shape contour of the formed single deposition point.

11. The powder point-by-point high-pressure torsional solidification additive process according to claim 10, characterized by: Before the horizontal transverse positioning mechanism drives the forming die assembly to move horizontally, the side wall of the forming cavity is in an open state on the side opposite to the horizontal moving direction of the forming die assembly.

12. The powder point-by-point high-pressure torsional solidification additive process according to claim 10, characterized by: In the step S5, the preset torsional pressing and forming pressure is 2-10 GPa, the rotating speed of the rotating die is 0.5-5 rad / min, and the number of single rotation is 0.5-2 revolutions.

13. Powder point-by-point high-pressure torsional solidification additive process according to any one of claims 9 to 12, characterized in that: The materials of the metal powders of different deposition points in the same single material layer are partially different or totally different.

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