High-speed rotating high-load bar clamping device, system and method

Abstract

The invention relates to a high-speed rotating and high-load bar clamping device, system and method. The high-speed rotating and high-load bar clamping device comprises a mechanism main body piece; the clamping driving device is arranged in the mechanism main body piece and is used for providing rotating power; the rotary transmission assembly is connected with the clamping driving device and used for transmitting rotary motion; the spiral conversion mechanism comprises spiral inclined planes which are matched with each other and converts the rotary motion into axial displacement; the core shaft is arranged in the mechanism main body piece in an axial moving manner; the clamping assembly is arranged at the end part of the mandrel and is used for clamping or loosening a bar; the bearing assembly is used for supporting the rotary transmission assembly; the clamping driving device drives the spiral switching mechanism to rotate through the rotary transmission assembly, so that the mandrel generates axial displacement, and the clamping assembly is driven to clamp or loosen a bar. According to the continuous solid-phase material adding device, the bar can be clamped, meanwhile, high-speed rotation of the bar can be achieved, high upsetting force can be applied to the bar, and continuous solid-phase material adding is achieved.

Description

Technical Field

[0001] This invention relates to the field of solid-phase additive manufacturing technology, and in particular to a high-speed rotating high-load bar clamping device, system and clamping method. Background Technology

[0002] Friction stir solid phase additive manufacturing (AFSD) technology has advantages such as high additive efficiency and low raw material cost, making it suitable for rapid prototyping of large rotating bodies or irregularly shaped parts. It can realize short-process integrated manufacturing of large metals (especially lightweight alloys such as aluminum alloys), and has become a research hotspot at home and abroad in recent years.

[0003] Existing AFSD equipment uses the contact friction between the shaft shoulder end face and the raw material bar and the substrate to generate heat and plasticize the metal to achieve additive layer forming. This results in huge pressure between the raw material bar and the stirring tool and the substrate / added part. The raw material bar cannot stably overcome the problem of high upsetting force under conventional clamping methods (hydraulic driven elastic collet, hydraulic stability is slightly poor and response speed is slow, elastic collet has life problems such as deformation and elastic failure, and it is difficult to achieve continuous solid phase additive manufacturing by applying upsetting force to the end of the bar). Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a high-speed rotating high-load bar clamping device, system and clamping method, which can solve the problem of bar clamping while realizing high-speed rotation of bar and applying high upsetting force to bar, thereby realizing continuous solid-phase additive manufacturing.

[0005] To solve the above-mentioned technical problems, the present invention provides a high-speed rotating high-load bar clamping device, comprising: Main components of the organization; A clamping drive device is disposed within the main body of the mechanism and is used to provide rotational power; A rotary transmission assembly, connected to the clamping drive device, is used to transmit rotary motion; The helical conversion mechanism, including interlocking helical inclined planes, converts rotational motion into axial displacement; The mandrel is axially movable within the main body of the mechanism; A clamping assembly, disposed at the end of the mandrel, is used to clamp or release the bar stock; the clamping assembly body comprises a clamping wedge block and multiple chucks; the clamping wedge block is axially movable within the clamping assembly body; the chucks are radially movable within the clamping assembly body and wedge-shapedly engage with the clamping wedge surface of the clamping wedge block; the clamping surface of the chucks facing the bar stock has a toothed structure to resist the upsetting force during the solid-phase additive manufacturing process when clamping the bar stock; Bearing assemblies are used to support rotary transmission components; The clamping drive device drives the spiral conversion mechanism to rotate through the rotary transmission assembly, causing the mandrel to generate axial displacement, which in turn drives the clamping assembly to clamp or release the bar stock.

[0006] In one embodiment of the present invention, the helical conversion mechanism includes: The spiral conversion mechanism includes: A rotating clamping and fixing plate is fixedly installed on the main body of the mechanism, and its lower end face is provided with a first spiral inclined surface; A rotating clamping plate is connected to the rotating transmission assembly, and its upper end face is provided with a second spiral inclined surface that cooperates with the first spiral inclined surface. The rotating clamping plate is connected to the mandrel. A rotary clamping bearing housing is connected to the rotary transmission assembly; the rotary clamping plate is mounted on the rotary clamping bearing housing; and the rotary clamping bearing housing is connected to the spindle. The first helical inclined plane and the second helical inclined plane have a self-locking angle.

[0007] In one embodiment of the present invention, the clamping drive device is a clamping motor, and the rotary transmission assembly includes a clamping seat and a rotary clamping plate. The clamping seat is connected to the rotor of the clamping motor, and the rotary clamping plate is connected to the clamping seat via a rotary clamping key. The rotary clamping key transmits torque while allowing the rotary clamping plate to move axially relative to the clamping seat.

[0008] In one embodiment of the present invention, the clamping surface of the chuck facing the bar stock is provided with a toothed structure to resist the upsetting force during the solid-phase additive manufacturing process when clamping the bar stock; the chuck is also provided with a wedge-shaped surface and double-sided planes, the wedge-shaped surface realizes the horizontal movement of the chuck under the action of the up and down movement of the clamping wedge block; the double-sided planes cooperate with the side of the chuck hole so that the chuck does not deviate laterally during operation.

[0009] In one embodiment of the present invention, the clamping assembly includes: Clamping component body, The clamping wedge block is axially movable within the clamping assembly body. Multiple clamps are radially movable within the clamping assembly body and engage with the clamping wedge surface of the clamping wedge block. The axial displacement of the mandrel drives the axial movement of the clamping wedge block, which in turn drives the radial movement of the chuck to clamp or release the bar stock. The chuck is fixed to the clamping assembly body and is used to mount the clamp. The elastic reset element includes a spring and a tension spring disposed between the chuck mounting base and the chuck, for keeping the chuck in an open state under normal conditions.

[0010] In one embodiment of the invention, a replaceable hollow sleeve is further included. The hollow sleeve is installed inside the mandrel for the passage of bar stock. The inner diameter of the hollow sleeve can be changed according to the cross-sectional dimensions of the bar stock. During replacement, a hollow sleeve with the corresponding inner diameter is used according to the cross-sectional dimensions of the bar stock, allowing the same clamping mechanism to adapt to bar stock of different specifications.

[0011] In one embodiment of the present invention, the bearing assembly includes: The first set of bearings includes a lower bearing assembly disposed between the spindle and the main body of the mechanism, for bearing axial force; The second set of bearings includes a large bearing assembly disposed between the rotor of the clamping drive device and the main body of the mechanism, which is used to support the rotation of the rotor and withstand the axial force during the clamping process; The third set of bearings includes an upper rotary clamping bearing and a lower rotary clamping bearing located in the middle of the mandrel, which assist the mandrel in high-speed rotation.

[0012] In one embodiment of the present invention, an external rotation drive device is further included, which is connected to the clamping assembly and is used to drive the clamping assembly to rotate at high speed.

[0013] Secondly, in order to solve the above-mentioned technical problems, the present invention provides a bar stock clamping system, including two sets of bar stock clamping mechanisms as described in the first aspect, arranged vertically, a linear motion support frame, a rotary drive device, and a control system; the bar stock clamping mechanism is fixed to an external linear motion mechanism through the linear motion support frame, and the external rotary drive device drives the clamping assembly to rotate at high speed; the control system is used to control the two sets of clamping mechanisms to work alternately: after the lower clamping mechanism clamps the bar stock and feeds it downward to a set position, the upper clamping mechanism performs a clamping action and continues to feed the bar stock downward, and the lower clamping mechanism releases the bar stock and returns to the initial position upward, and so on, to achieve high-speed rotation, clamping, and continuous feeding of the bar stock.

[0014] Thirdly, in order to solve the above-mentioned technical problems, the present invention provides a high-speed rotating clamping method for bar stock, applied to the clamping mechanism described in the first aspect, the clamping method comprising: The raw material bar is fed into the clamping mechanism so that the end of the bar extends beyond the chuck area; Start the clamping motor, which drives the helical conversion mechanism to rotate through the rotary transmission assembly. The first helical inclined surface of the helical conversion mechanism and the second helical inclined surface cooperate to generate axial displacement, which pushes the mandrel to move downward. The downward movement of the mandrel drives the clamping wedge block to move axially downward. The flat key guides the clamping wedge block, fixing it circumferentially to the clamping assembly body while allowing it to move linearly axially. When the clamping wedge block moves downward, it drives multiple chucks to move radially inward through the clamping wedge surface, clamping the raw material bar. The chuck uses a toothed structure to engage with the surface of the bar stock to resist the axial upsetting force during the additive manufacturing process.

[0015] Compared with the prior art, the above-described technical solution of the present invention has the following advantages: The high-speed rotating high-load bar clamping device of the present invention can rotate at high speed when clamping bar stock. By converting the rotational power into axial displacement and then driving the clamping assembly, the device achieves the composite working condition of bar stock bearing high upsetting force while rotating at high speed. This is in contrast to the slow response and easy failure of hydraulic elastic collets in the prior art.

[0016] The clamping system of this invention features two mechanisms that work alternately to achieve continuous feeding with "zero downtime," solving the industry problem of unusable bar stock ends in traditional single-mechanism systems. Both additive manufacturing efficiency and material utilization are improved, making it particularly suitable for continuous additive manufacturing of large components at the meter level.

[0017] When the clamping device of the present invention is in the released state, the radial space through which the bar stock can pass is larger than the opening diameter of the elastic collet of the same specification, which significantly improves the adaptability to the dimensional tolerance and straightness deviation of the bar stock to be processed, effectively avoids the problem of clamping failure or unstable clamping caused by the opening restriction of the elastic collet of the existing clamping device, and improves the reliability and adaptability of clamping. Attached Figure Description

[0018] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the high-speed rotating high-load bar clamping device in Embodiment 1 of the present invention; Figure 2 Figure 1 A schematic diagram of the structure for inserting raw material bars in a medium-to-high speed rotating high-load bar clamping device; Figure 3 This is a schematic diagram of the rotating clamping fixing plate in this invention; Figure 4 This is a schematic diagram of the rotating clamping plate in this invention; Figure 5 This is a schematic diagram of the rotating clamping bearing housing in this invention; Figure 6 This is a schematic diagram of the clamping seat in the present invention; Figure 7 This is a schematic diagram of the rotating clamping bearing housing in this invention; Figure 8This is a schematic diagram of the mandrel structure in this invention; Figure 9 This is a schematic diagram of the clamping wedge block in the chuck assembly of the present invention; Figure 10 This is a partial structural diagram of the clamping motor in this invention; Figure 11 This is a partial structural diagram of the main component of the mechanism in this invention; Figure 12 This is a partial structural diagram of the clamping assembly in this invention; Figure 13 This is a schematic diagram of the structure of the chuck in the chuck assembly of the present invention; Figure 14 This is a schematic diagram of the hollow sleeve in this invention; Figure 15 This is a schematic diagram of the combined structure of the two bar clamping mechanisms in Embodiment 2 of the present invention; Explanation of reference numerals in the instruction manual: 1-1 Rotary clamping fixing plate; 1-1-1 Locking surface; 1-1-2 Mounting locking hole; 1-1-4 First hollow through hole; 1-1-5 Clamping motor wire passage hole; 1-1-6 First mounting stop; 1-1-7 Inner ring stop; 1-2. Rotary clamping plate; 1-2-1. Spiral inclined surface; 1-2-2. Hollow through hole; 1-2-3. Mounting and fixing hole; 1-3. Rotary clamping of the bearing housing; 1-3-1. Rotary clamping of the upper bearing mounting countersunk hole; 1-3-2. Locking screw hole; 1-3-3. First cylindrical surface; 1-3-4. Installation keyway; 1-4 Clamping seat; 1-4-1 Rotor mounting hole; 1-4-2 Rotor mounting circumferential surface; 1-4-3 Inner ring mounting surface; 1-4-4 Axial keyway; 1-4-5 Second hollow through hole; 1-5. Rotate the clamping key; 1-6 Clamping motor; 1-6-1, First sealing ring; 1-6-2, Stator; 1-6-3, Second sealing ring; 1-7. Main body of the mechanism; 1-7-1. First screw hole; 1-7-2. Inner cylindrical surface; 1-7-3. Countersunk hole for mounting the large bearing assembly; 1-7-4. Mounting hole for the bar clamping mechanism; 1-7-5. Second cylindrical surface; 1-7-6. Countersunk hole for mounting the lower bearing assembly; 1-7-7. Second screw hole; 1-8. Rotate and clamp the bearing end cover; 1-9. Mandrel; 1-9-2. Bearing mounting cylindrical surface; 1-9-3. Hollow through hole; 1-9-4. Mounting surface; 1-9-5. Locking screw hole; 1-9-6. Cylindrical section; 1-9-7. Groove; 1-10. Clamping assembly; 1-10-1. Clamping assembly main body; 1-10-2. Flat key; 1-10-3. Clamping wedge block; 1-10-3, Clamping wedge block; 1-10-3-1, Third hollow through hole; 1-10-3-2, Hook; 1-10-3-3, Keyway; 1-10-3-4, Third cylindrical surface; 1-10-3-5, Clamping wedge surface; 1-10-4, Spring; 1-10-5, Chuck mounting base; 1-10-5-1, Mounting through hole; 1-10-5-2, Threaded hole; 1-10-5-3, Bar stock through hole; 1-10-5-4, Chuck hole; 1-10-5-5, Spring stop; 1-10-5-6, Second mounting stop; 1-10-6, Chuck; Tooth; 1-10-6-1; 1-10-6-2, Wedge-shaped surface; 1-10-6-3, Double-sided plane; 1-10-7, Tension spring mounting pin; 1-10-8, Tension spring; 1-10-9, Clamp locking plate; 1-10-10, Pulley locking plate; 1-10-11, Pulley; 1-11. Rotate and clamp the bearing locking nut; 1-12, Hollow sleeve; 1-12-1, Guide bevel; 1-12-2, Hollow through hole; 1-12-3, Mounting hole; 1-12-4, Cylindrical surface; 1-12-5, Stepped surface; 1-13. Rotary clamping of the upper bearing; 1-14. Rotary clamping of the bearing inner ring bushing; 1-15. Rotary clamping of the lower bearing; 1-16. Large bearing assembly; 1-17. Lower bearing assembly; 1-18. Locking end cover of the lower bearing assembly; 1-19. Locking end cover of the large bearing assembly; 1-20. Locking upper end cover of the lower bearing assembly; 1-21. Raw material bar stock; 1-22. Support frame; 1-24. Synchronous belt. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0021] Reference Figure 1-2 As shown, the present invention provides a high-speed rotating high-load bar stock clamping device, comprising: Main components 1-7; A clamping drive device is disposed within the main body components 1-7 of the mechanism and is used to provide rotational power; A rotary transmission assembly, connected to the clamping drive device, is used to transmit rotary motion; The helical conversion mechanism, including interlocking helical inclined planes, converts rotational motion into axial displacement; The spindle 1-9 is axially movable within the main body 1-7 of the mechanism; A clamping assembly 1-10 is disposed at the end of the mandrel 1-9 and is used to clamp or release the bar stock. The clamping assembly 1-10 includes the clamping assembly body 1-10-1, a clamping wedge block 1-10-3, and multiple chucks. The clamping wedge block 1-10-3 is axially movable within the clamping assembly body 1-10-1. Multiple chucks 1-10-6 are radially movable within the clamping assembly body 1-10-1 and wedge-shapedly engage with the clamping wedge face 1-10-3-5 of the clamping wedge block 1-10-3. The mandrel... The axial displacement of 1-9 drives the clamping wedge block 1-10-3 to move axially, thereby driving the chuck 1-10-6 to move radially to clamp or release the bar stock 1-21; the clamping assembly also includes: a chuck mounting base 1-10-5, fixed to the clamping assembly body 1-10-1, for mounting the chuck 1-10-6; and an elastic reset member, including a spring 1-10-4 and a tension spring 1-10-8 disposed between the chuck mounting base 1-10-5 and the chuck 1-10-6, for keeping the chuck 1-10-6 in an open state under normal conditions, such as Figure 12 As shown; The axial displacement of the mandrel 1-9 causes the clamping wedge block 1-10-3 to move axially, which in turn drives the chuck 1-10-6 to move radially, thus clamping or releasing the bar stock 1-21. The chuck 1-10-6 has a toothed structure on its clamping surface facing the bar stock to resist the upsetting force during the solid-phase additive manufacturing process when clamping the bar stock. Bearing assemblies are used to support rotary transmission components; The clamping drive device drives the spiral conversion mechanism to rotate through the rotary transmission assembly, causing the mandrel 1-9 to generate axial displacement, thereby driving the clamping assembly to clamp or release the bar stock.

[0022] like Figure 11As shown, the main body component 1-7 is provided with a first screw hole 1-7-1 for installation and fastening; an inner cylindrical surface 1-7-2 is provided for installing the stator, ensuring the coaxiality of the stator while forming a coolant flow cavity with the cooling channel 1-6-2 on the outer side of the stator. A first sealing ring 1-6-1 and a second sealing ring 1-6-2 are provided at the top and bottom of the cavity for sealing. A countersunk hole 1-7-3 for installing the large bearing assembly 1-16 is provided; a bar clamping mechanism mounting hole 1-7-4 is provided for installing the mechanism on external equipment; a cylindrical surface 1-7-5 is provided to ensure the coaxiality of the mechanism with the external equipment; a countersunk hole 1-7-6 for installing the lower bearing assembly 1-17 is provided; and a second screw hole 1-7-7 is provided for locking the lower bearing assembly end cap 1-18 for fixing and locking. Furthermore, the helical conversion mechanism includes: A rotating clamping fixing plate 1-1 is fixedly installed on the main body component 1-7 of the mechanism, and its lower end face is provided with a first spiral inclined surface 1-1-3; as shown in the figure. Figure 3 As shown, the rotary clamping fixing plate 1-1 is provided with a mounting locking surface 1-1-1, a mounting locking hole 1-1-2, a first hollow through hole 1-1-4, a clamping motor wire passage hole 1-1-5, and a first mounting stop 1-1-6 to ensure its coaxiality with the main body of the mechanism 1-7; an inner ring stop 1-1-7 is also provided to ensure its coaxiality with the clamping seat 1-4; A rotating clamping plate 1-2 is connected to the rotating transmission assembly. Its upper end face is provided with a second helical inclined surface 1-2-1 that mates with the first helical inclined surface 1-1-3. The rotating clamping plate 1-2 is connected to the mandrel 1-9. Figure 4 As shown, the rotating clamping plate 1-2 is provided with a matching spiral inclined surface 1-2-1, a hollow through hole 1-2-2, and a mounting and fixing hole 1-2-3; A rotary clamping bearing housing 1-3 is connected to the rotary transmission assembly. A rotary clamping plate 1-2 is mounted on the rotary clamping bearing housing 1-3. The rotary clamping bearing housing 1-3 is connected to the spindle 1-9. Figure 5 As shown, the rotary clamping bearing housing 1-3 is provided with a rotary clamping upper bearing mounting countersunk hole 1-3-1, and 1-3-2 is a mounting locking screw hole for the rotary clamping plate 1-2. The first cylindrical surface 1-3-3 ensures the coaxiality of the installation with the clamping seat 1-4. The mounting keyway 1-3-4 is used to install the rotary clamping key 1-5. The stepped countersunk holes 1-3-5 are distributed at the upper and lower ends of the part, providing installation space for the outer rings of the rotary clamping upper bearing 1-13 and the rotary clamping lower bearing 1-15, respectively. The first spiral inclined plane 1-1-3 and the second spiral inclined plane 1-2-1 have a self-locking angle.

[0023] The spiral inclined plane self-locking structure design ensures that the clamping force can be maintained for a long time without continuous energy consumption when the clamping motor stops or is powered off, significantly improving equipment safety and energy efficiency. At the same time, the high precision of the spiral drive allows for more accurate clamping force control, avoiding the pressure fluctuation problems of traditional pneumatic / hydraulic control.

[0024] The clamping drive device is a clamping motor 1-6. The rotary transmission assembly includes a clamping seat 1-4 and a rotary clamping plate 1-2. The clamping seat 1-4 is connected to the rotor of the clamping motor 1-6. The rotary clamping plate 1-2 is connected to the clamping seat 1-4 through a rotary clamping key 1-5. The rotary clamping key 1-5 transmits torque while allowing the rotary clamping plate 1-2 to move axially relative to the clamping seat 1-4.

[0025] The clamping motor 1-6 is a stator-rotor type, providing power for clamping the raw material bar 1-21. The stator is fixed inside the main body 1-7 of the mechanism, secured by screws or adhesive. The clamping motor 1-6 includes a stator 1-6-2, and the cooling channels on the outside of the stator 1-6-2 form a coolant flow cavity. The cavity is sealed with a first sealing ring 1-6-1 and a second sealing ring 1-6-3 at the top and bottom. Figure 11 As shown The rotor clamping part is fixed to the outer periphery of the clamping seat 1-4; the rotary clamping bearing seat 1-3 is connected to the clamping seat 1-4 by a rotary clamping key 1-5. The rotary clamping key 1-5 provides rotational torque transmission and can move up and down along the keyway of the clamping seat 1-4, providing the up and down movement stroke of the clamping action; the rotary clamping plate 1-2 is fixedly installed on the rotary clamping bearing seat 1-3, and its lower end face provides pressure on the outer end face of the rotary clamping upper bearing 1-13, and its upper end face is the rotary clamping profile.

[0026] like Figure 6 As shown, the clamping seat 1-4 is provided with a rotor mounting hole 1-4-1 and a rotor mounting circumferential surface 1-4-2 for mounting the clamping motor 1-6, an inner ring mounting surface 1-4-3 for mounting the large bearing assembly 1-16, an axial keyway 1-4-4, and the rotary clamping key 1-5 is embedded in the axial keyway 1-4-4 and can slide axially; a second hollow through hole 1-4-5 is provided to ensure coaxiality with the rotary clamping bearing seat 1-3.

[0027] It also includes a replaceable hollow sleeve 1-12, which is installed inside the mandrel 1-9 for the passage of bar stock 1-21. The inner diameter of the hollow sleeve 1-12 can be changed according to the cross-sectional dimensions of the bar stock 1-21. When changing the bar stock 1-21, a hollow sleeve 1-12 with the corresponding inner diameter is replaced according to the cross-sectional dimensions of the bar stock 1-21, so that the same clamping mechanism can adapt to different specifications of bar stock 1-21.

[0028] like Figure 7 As shown, the mandrel 1-9 is provided with a locking thread, and the bearing mounting cylindrical surfaces 1-9-2 and 1-9-3 are hollow through holes to ensure the coaxiality of the hollow sleeve 1-12 during installation; 1-9-4 is the mounting surface for locking the hollow sleeve 1-12, 1-9-5 is a locking screw hole, and the wall of the cylindrical section 1-9-6 is relatively thin, which facilitates the clamping of the bearing locking nut 1-11 by rotation. The groove 1-9-7 provides a forward pressing and backward loosening interface for the clamping assembly 1-10.

[0029] like Figure 8 As shown, the clamping wedge block 1-10-3 is provided with a third hollow through hole 1-10-3-1 for the installation of the spring 1-10-4. The circumferential array of hooks 1-10-3-2 can be in 2, 3, or 4 groups, etc., for transmitting the up-and-down movement force of the clamping wedge block 1-10-3. A keyway 1-10-3-3 is provided, and a flat key 1-10-2 is installed to ensure that the clamping wedge block 1-10-3 moves up and down along a straight line. A third cylindrical surface 1-10-3-4 is provided to ensure the coaxiality of the clamping wedge block 1-10-3 with the overall mechanism. A clamping wedge surface 1-10-3-5 is provided, and the up-and-down movement realizes the clamping and releasing of the gripper.

[0030] like Figure 9 As shown, the chuck mounting base 1-10-5 is provided with a mounting through hole 1-10-5-1 for mounting and locking the chuck mounting base 1-10-5 onto the clamping assembly body 1-10-1; a threaded hole 1-10-5-2 is provided for mounting the locking pulley locking plate 1-10-10; a bar stock through hole 1-10-5-3 is provided, with a cross-sectional dimension larger than that of the raw material bar stock 1-21 to ensure the smooth passage of the raw material bar stock 1-21; a chuck hole 1-10-5-4 is provided for mounting and placing the chuck 1-10-6; a spring stop 1-10-5-5 is provided for guiding the inner diameter of the spring 1-10-4; and a second mounting stop 1-10-5-6 is provided to ensure the coaxiality of this structure with the overall mechanism.

[0031] like Figure 13 As shown, the clamping surface of the chuck 1-10-6 facing the bar stock 1-21 is provided with a toothed structure 1-10-6-1, which is used to resist the upsetting force during the solid-phase additive manufacturing process when clamping the bar stock 1-21. The chuck 1-10-6 is also provided with a wedge-shaped surface 1-10-6-2 and a double-sided plane 1-10-6-3. The wedge-shaped surface 1-10-6-2 realizes the horizontal movement of the chuck 1-10-6 under the action of the up and down movement of the pressing wedge block 1-10-3. The double-sided plane 1-10-6-3 cooperates with the side of the chuck hole 1-10-5-4 to ensure that the chuck 1-10-6 does not deviate laterally during operation.

[0032] Furthermore, it also includes a replaceable hollow sleeve 1-12, which is installed inside the mandrel 1-9 for the passage of raw material bar 1-21. The inner diameter of the hollow sleeve 1-12 can be changed according to the cross-sectional dimensions of the raw material bar 1-21.

[0033] In this embodiment, the raw material bar 1-21 is cylindrical, but not limited to cylindrical. When the raw material bar 1-21 is replaced, a hollow sleeve 1-12 with a corresponding inner diameter is replaced according to the cross-sectional dimensions of the raw material bar 1-21. At the same time, the chuck 1-10-6 is replaced according to the cross-section of the raw material bar 1-21, so that the clamping surface of the chuck 1-10-6 facing the bar 1-21 is adapted to the raw material bar 1-21, thus meeting the requirement of the same clamping mechanism to adapt to raw material bars of different specifications.

[0034] like Figure 14 Hollow sleeve 1-12 is provided with a guide angle 1-12-1 for the smooth passage of raw material bar 1-21. Hollow through hole 1-12-2 is provided for the passage of raw material bar 1-21. Hollow sleeve mounting hole 1-12-3 is provided for installing and locking hollow sleeve 1-12 onto mandrel 1-9. Hollow sleeve cylindrical surface 1-12-4 is provided to ensure the coaxiality of the inner hole with the overall mechanism. Step surface 1-12-5 is provided for the inner diameter installation guide of spring 1-10-4.

[0035] In practical applications, the inner diameter of the hollow sleeve 1-12 can be made into different cross-sectional sizes to facilitate the passage of raw material bars 1-21 with different cross-sectional sizes by simply replacing the hollow sleeve 1-12.

[0036] The bearing assembly includes: The first set of bearings includes a lower bearing assembly 1-17 disposed between the spindle 1-9 and the main body 1-7 of the mechanism, for bearing axial force; The second set of bearings includes a large bearing assembly 1-16 disposed between the rotor of the clamping drive device and the main body 1-7 of the mechanism, which is used to support the rotation of the rotor and bear the axial force during the clamping process. The third set of bearings includes a rotating clamping upper bearing 1-13 and a rotating clamping lower bearing 1-15 located in the middle of the mandrel 1-9, which assist the mandrel 1-9 in high-speed rotation.

[0037] Furthermore, it also includes an external rotation drive device, which is connected to the clamping assembly 1-10 through a transmission mechanism to drive the clamping assembly 1-10 to rotate at high speed.

[0038] The transmission mechanism includes pulley 1-10-11 and synchronous belt 1-24. The bottom of the clamping assembly 1-10 locks pulley 1-10-11 (e.g., 1-10-10) via pulley locking plate 1-10-10. Figure 12 As shown in the figure, the clamping assembly rotates at high speed under the action of the synchronous belt 1-24 and the external rotary drive device.

[0039] In this embodiment, the transmission mechanism can also be implemented by gears. A driven gear is coaxially connected to the bottom of the clamping assembly 1-10. An external rotation drive device transmits torque to the clamping assembly 1-10 and the bar stock 1-21 by meshing the driving gear with the driven gear.

[0040] It should be noted that the transmission mechanism for driving the clamping assembly to rotate 1-10 is not limited to synchronous belts 1-24 or gears, but can also adopt other methods well known to those skilled in the art, such as chain drive and direct drive of couplings, which will not be described in detail here.

[0041] like Figure 15 As shown, the present invention provides a bar stock clamping system, including two sets of bar stock clamping mechanisms arranged vertically as described in Embodiment 1, a linear motion support frame 1-22, a rotary drive device, and a control system; the bar stock clamping mechanism is fixed to an external linear motion mechanism via the linear motion support frame 1-22, and the external rotary drive device drives the clamping assembly 1-10 to rotate at high speed; the control system is used to control the two sets of clamping mechanisms to work alternately: after the lower clamping mechanism clamps the bar stock 1-21 and feeds it downward to a set position, the upper clamping mechanism performs a clamping action and continues to feed the bar stock downward, and the lower clamping mechanism releases the bar stock 1-21 and returns it to the initial position upward, and so on, to achieve high-speed rotational clamping and continuous feeding of the bar stock 1-21.

[0042] After the bar stock is clamped, the external drive device drives the clamped raw material bar stock 1-21 to rotate at high speed through the synchronous belt 1-24, and at the same time, the support frame 1-22 applies a downward upsetting force to the clamping mechanism to perform solid phase additive manufacturing.

[0043] This invention provides a high-speed rotary clamping method for bar stock, applied to the clamping mechanism described in Embodiment 1, wherein the clamping method includes: Feed the raw material bar 1-21 into the clamping mechanism so that the end of the bar 1-21 extends beyond the area of ​​the chuck 1-10-6; Start the clamping motor 1-6, which drives the screw conversion mechanism to rotate through the rotary transmission assembly. The first helical inclined surface 1-1-3 of the screw conversion mechanism and the second helical inclined surface 1-2-1 cooperate to generate axial displacement, which pushes the mandrel 1-9 to move downward. The downward movement of the spindle 1-9 drives the clamping wedge block 1-10-3 to move axially downward. The flat key 1-10-2 guides the clamping wedge block 1-10-3, making it circumferentially fixed to the clamping assembly body 1-10-1 and axially linearly movable; When the clamping wedge block 1-10-3 moves downward, it drives multiple chucks 1-10-6 to move radially inward through the clamping wedge surface 1-10-3-5, clamping the raw material bar 1-21; The chuck 1-10-6 engages with the surface of the bar stock 1-21 through the toothed structure 1-10-6-1 to resist the axial upsetting force during the additive manufacturing process.

[0044] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A high-speed rotating high-load bar clamping device, characterized in that, include: Main components of the organization; A clamping drive device is disposed within the main body of the mechanism and is used to provide rotational power; A rotary transmission assembly, connected to the clamping drive device, is used to transmit rotary motion; The helical conversion mechanism, including interlocking helical inclined planes, converts rotational motion into axial displacement; The mandrel is axially movable within the main body of the mechanism; A clamping assembly is disposed at the end of the mandrel for clamping or releasing bar stock; the clamping assembly body comprises a clamping wedge block and multiple chucks; the clamping wedge block is axially movable within the clamping assembly body; the chucks are radially movable within the clamping assembly body and engage with the clamping wedge surface of the clamping wedge block. Bearing assemblies are used to support rotary transmission components; The clamping drive device drives the spiral conversion mechanism to rotate through the rotary transmission assembly, causing the mandrel to generate axial displacement, which in turn drives the clamping assembly to clamp or release the bar stock.

2. The high-speed rotating high-load bar clamping mechanism according to claim 1, characterized in that, The spiral conversion mechanism includes: A rotating clamping and fixing plate is fixedly installed on the main body of the mechanism, and its lower end face is provided with a first spiral inclined surface; A rotating clamping plate is connected to the rotating transmission assembly, and its upper end face is provided with a second spiral inclined surface that cooperates with the first spiral inclined surface. The rotating clamping plate is connected to the mandrel. A rotary clamping bearing housing is connected to the rotary transmission assembly; the rotary clamping plate is mounted on the rotary clamping bearing housing; and the rotary clamping bearing housing is connected to the spindle. The first helical inclined plane and the second helical inclined plane have a self-locking angle.

3. The high-speed rotating high-load bar clamping mechanism according to claim 2, characterized in that, The clamping drive device is a clamping motor, and the rotary transmission assembly includes a clamping seat and a rotary clamping plate. The clamping seat is connected to the rotor of the clamping motor, and the rotary clamping plate is connected to the clamping seat via a rotary clamping key. The rotary clamping key transmits torque while allowing the rotary clamping plate to move axially relative to the clamping seat.

4. The high-speed rotating high-load bar clamping mechanism according to claim 1, characterized in that, The clamping surface of the chuck facing the bar stock has a toothed structure to resist the upsetting force during the solid-phase additive manufacturing process when clamping the bar stock; the chuck is also provided with a wedge-shaped surface and double-sided planes. The wedge-shaped surface realizes the horizontal movement of the chuck under the action of the up and down movement of the clamping wedge block; the double-sided planes cooperate with the side of the chuck hole so that the chuck does not deviate laterally during operation.

5. The high-speed rotating high-load bar clamping mechanism according to claim 1, characterized in that, The clamping assembly further includes: A chuck mounting base is fixed to the main body of the clamping assembly and is used to mount the chuck; The elastic reset element includes a spring and a tension spring disposed between the chuck mounting base and the chuck, for keeping the chuck in an open state under normal conditions.

6. The high-speed rotating high-load bar clamping mechanism according to claim 1, characterized in that, It also includes a replaceable hollow sleeve, which is installed inside the mandrel for the passage of bar stock. The inner diameter of the hollow sleeve can be changed according to the cross-sectional dimensions of the bar stock. When changing, a hollow sleeve with the corresponding inner diameter is replaced according to the cross-sectional dimensions of the bar stock, so that the same clamping mechanism can adapt to bar stock of different specifications.

7. The high-speed rotating high-load bar clamping mechanism according to claim 1, characterized in that, The bearing assembly includes: The first set of bearings includes a lower bearing assembly disposed between the spindle and the main body of the mechanism, for bearing axial force; The second set of bearings includes a large bearing assembly disposed between the rotor of the clamping drive device and the main body of the mechanism, which is used to support the rotation of the rotor and withstand the axial force during the clamping process; The third set of bearings includes an upper rotary clamping bearing and a lower rotary clamping bearing located in the middle of the mandrel, which assist the mandrel in high-speed rotation.

8. The high-speed rotating high-load bar clamping mechanism according to claim 1, characterized in that, It also includes an external rotation drive device, which is connected to the clamping assembly and drives the clamping assembly to rotate at high speed.

9. A bar stock clamping system, characterized in that, The device includes two sets of bar clamping mechanisms as described in any one of claims 1-8, arranged vertically, a linear motion support frame, a rotary drive device, and a control system. The bar clamping mechanism is fixed to an external linear motion mechanism via the linear motion support frame, and the external rotary drive device drives the clamping assembly to rotate at high speed. The control system is used to control the two clamping mechanisms to work alternately: after the lower clamping mechanism clamps the bar and feeds it downward to a set position, the upper clamping mechanism performs a clamping action and continues to feed the bar downward, while the lower clamping mechanism releases the bar and returns it to its initial position. This cycle is repeated to achieve high-speed rotation, clamping, and continuous feeding of the bar.

10. A high-speed rotary clamping method for bar stock, applied to the clamping mechanism described in any one of claims 1-8, characterized in that, The clamping method includes: The raw material bar is fed into the clamping mechanism so that the end of the bar extends beyond the chuck area; Start the clamping motor, which drives the helical conversion mechanism to rotate through the rotary transmission assembly. The first helical inclined surface of the helical conversion mechanism and the second helical inclined surface cooperate to generate axial displacement, which pushes the mandrel to move downward. The downward movement of the mandrel drives the clamping wedge block to move axially downward. The flat key guides the clamping wedge block, fixing it circumferentially to the clamping assembly body while allowing it to move linearly axially. When the clamping wedge block moves downward, it drives multiple chucks to move radially inward through the clamping wedge surface, clamping the raw material bar. The chuck uses a toothed structure to engage with the surface of the bar stock to resist the axial upsetting force during the additive manufacturing process.

Images