A method and device for spinning a javelin shaft

Abstract

The application discloses a spinning processing method for a spear body, which comprises the following steps: S1, positioning and supporting a pipe between two pipe end positioning sleeves and clamping the pipe by using a pipe rotating mechanism; S2, driving the pipe to rotate uniformly; S3, clamping the pipe from the radial outside of the pipe by using a centering mechanism to limit the radial deviation of the pipe in the subsequent processing process and keeping the centering state; and S4, spinning forming, which comprises the following steps: S4.1, radial feeding, making two groups of spinning rollers on two spinning units contact the outer wall of the rotating pipe in a left-right opposite state and applying radial pressure; and S4.2, axial feeding and synchronous spinning, driving the centering mechanism and each spinning unit to move in the direction parallel to the pipe axis under the condition that the spinning rollers contact the outer wall of the pipe, so that the pipe is processed and formed. The application has the advantages that the uniformity of the circumferential wall thickness of the spear body can be improved.

Description

Technical Field

[0001] This invention relates to the field of metal pipe processing technology, specifically to a method and apparatus for spinning javelin barrels. Background Technology

[0002] Metal javelins are commonly used sports equipment in throwing track and field events. They are usually composed of two parts: a metal spearhead and a metal shaft. The shaft is a hollow, thin-walled structure with a streamlined spindle shape that is thicker in the middle and thinner at both ends.

[0003] Currently, these spindle-shaped gun bodies are mainly formed by tube shrinking machines. However, while the tube shrinking process can ensure that the outline meets the requirements by compressing the straight tube into a spindle-shaped structure segment by segment, it is difficult to control the uniformity of the wall thickness in the circumferential direction of the tube body, which can easily lead to inconsistent wall thickness in the circumferential direction of the tube body.

[0004] According to the national standard GB / T 22765-2008 "Javelin", the javelin body must have sufficient rigidity. Therefore, the formed metal body needs to undergo quenching treatment to improve material properties. The conventional quenching process involves passing the metal body through an induction heating coil, heating the metal body through the coil, and then spraying the heated metal body to cool it, thus completing the quenching.

[0005] However, due to the uneven circumferential wall thickness of the gun body after tube shrinking and forming, when heated by induction coil, the thinner wall area heats up faster and at a higher temperature, while the thicker wall area heats up relatively later. This results in poor heating uniformity on the same cross section. This uneven heating not only affects the consistency of the microstructure after quenching, but more seriously, the thin-walled area may burn through due to overheating, directly affecting product quality and yield. Summary of the Invention

[0006] The first objective of this invention is to provide a method for spinning a javelin barrel, which involves rotating and feeding axially while simultaneously performing radial spinning, so that the tube is stretched axially while being compressed radially, thereby achieving the formation of a spindle-shaped barrel with uniform circumferential wall thickness.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a javelin barrel spinning process, comprising the following steps:

[0008] S1: Clamping and positioning: The two ends of the pipe are inserted and supported between two coaxially arranged pipe end positioning sleeves, and the pipe is clamped by the pipe rotation mechanism.

[0009] S2: Drive rotation: Start the pipe rotation mechanism to drive the clamped pipe to rotate at a constant speed around its own axis;

[0010] S3: Centering and Stabilization: The tube is clamped from the radial outside using a centering mechanism to limit its radial offset during subsequent processing and maintain centering; the centering mechanism moves synchronously with the spinning unit in the subsequent steps.

[0011] S4: Spin forming, this step includes:

[0012] S4.1: Radial feed: Drive two spinning units located on the left and right sides of the pipe to move synchronously towards each other, so that the two sets of spinning rollers on the two spinning units are in a left-right opposite position and simultaneously contact the outer wall of the rotating pipe and apply radial pressure.

[0013] S4.2: Axial feed and synchronous spinning: When the spinning rollers are in contact with the outer wall of the pipe, the centering mechanism and each spinning unit are driven to move together in a direction parallel to the pipe axis.

[0014] During this process, the tube is kept rotating continuously, and the two sets of spinning rollers apply continuous and uniform radial spinning force to the outer circumferential wall of the rotating tube throughout its entire axial movement, thereby gradually processing the tube into a spindle-shaped javelin body with uniform circumferential wall thickness.

[0015] Furthermore, in the aforementioned javelin shaft spinning method, during or after the spinning process, cooling water is continuously sprayed onto the high-temperature tubular spinning deformation zone for online cooling.

[0016] The second objective of this invention is to provide a javelin barrel processing device that implements the above-mentioned method. This device integrates tube rotation, axial feed, radial spinning, and centering stabilization functions, and can automatically and with high precision complete the processing of a shuttle-shaped javelin barrel with uniform circumferential wall thickness.

[0017] To achieve the above objectives, the present invention adopts the following technical solution: a javelin barrel spinning processing device, comprising a base, a tube rotation mechanism, two tube end positioning sleeves, and a tube spinning mechanism;

[0018] The two pipe end positioning sleeves are coaxially and symmetrically arranged on the front and rear sides of the base, so that the two ends of the pipe can be inserted to support the pipe.

[0019] The pipe rotation mechanism is used to clamp the pipe supported between the two pipe end positioning sleeves and drive it to rotate around its own axis.

[0020] A front and rear guide rail assembly extending in the front-rear direction is fixed on the top of the base; the pipe spinning mechanism is disposed between two pipe end positioning sleeves and slidably disposed on the front and rear guide rail assembly; the pipe spinning mechanism is connected to a walking drive mechanism, which is used to drive the pipe spinning mechanism to move along the front and rear guide rail assembly; the pipe spinning mechanism is used to perform radial spinning on the rotating pipe.

[0021] The pipe spinning mechanism includes: a sliding seat slidably disposed on the front and rear guide rail assembly, an alignment mechanism and two spinning units installed on the sliding seat, the two spinning units being distributed in a left-right opposite manner, the two spinning units cooperating to perform radial spinning on the rotating pipe, and the alignment mechanism being used to limit the radial displacement of the pipe so as to keep the pipe in an aligned state when the two spinning units perform radial spinning on the pipe;

[0022] Each spinning unit includes: a left and right guide rail assembly fixed on a sliding base and extending in the left and right direction; a spinning slide block slidably disposed on the left and right guide rail assembly; the spinning slide block is connected to a left and right translation drive mechanism; the left and right translation drive mechanism is used to drive the spinning slide block to translate along the left and right guide rail assembly; a roller frame is installed at the outer end of the spinning slide block; a set of spinning rollers for contacting the tube is installed on the roller frame; each set of spinning rollers consists of two spinning rollers that are symmetrically distributed vertically and can rotate freely around their own axis.

[0023] The two sets of spinning rollers of the two spinning units can move towards each other and press against the outer peripheral wall of the tube under the synchronous drive of the corresponding left and right translation drive mechanism. Through the cooperation of the walking drive mechanism and the left and right translation drive mechanism, the two sets of spinning rollers of the two spinning units can continuously apply radial spinning force to the rotating tube while moving along the tube axis, so as to process the tube into a shuttle-shaped javelin body.

[0024] Furthermore, in the aforementioned javelin shaft spinning processing device, the tube rotation mechanism comprises: a rotation frame mounted on a base, a seat fixed on the rotation frame, a rotating chuck rotatably mounted in the seat to clamp the tube, a rotation motor mounted on the rotation frame, a synchronous pulley mounted on the output shaft of the rotation motor, and a synchronous belt wound around the rotating chuck and the synchronous pulley. When the rotating chuck clamps the tube, the rotation motor drives the rotating chuck to rotate through the synchronous pulley and the synchronous belt, thereby synchronously driving the clamped tube to rotate around its own axis.

[0025] Furthermore, in the aforementioned javelin barrel spinning processing device, the structure of the walking drive mechanism includes: a rack extending in a forward and backward direction and fixedly installed on the side wall of the base, and a walking servo motor fixedly installed on the sliding seat. An output gear is coaxially installed on the output shaft of the walking servo motor, and the output gear meshes with the rack. The walking servo motor drives the output gear to walk along the rack, thereby synchronously driving the tube spinning mechanism to move along the forward and backward guide rail assembly.

[0026] Furthermore, in the aforementioned javelin barrel spinning processing device, the centering mechanism includes: a center frame fixed on a sliding seat, a centering cylinder vertically mounted on the top of the center frame, the piston rod of the centering cylinder facing downward and fixed with an active clamping arm, a first centering roller for contacting the tube being rotatably mounted at the bottom end of the active clamping arm, two linkage clamping arms symmetrically arranged on the left and right sides of the active clamping arm, each linkage clamping arm being hinged to the center frame via a central pivot shaft located in the middle, and a second centering roller for contacting the tube being rotatably mounted at the lower end of each linkage clamping arm;

[0027] The upper end of each linkage clamping arm is hinged to the active clamping arm through a set of connecting rod assemblies. When the centering cylinder drives the active clamping arm to move up and down, the connecting rod assembly can synchronously drive the two linkage clamping arms to swing around their respective central axis. This allows the first centering roller and the two second centering rollers to close together to clamp the pipe and keep it in a centered state, or to open up the first centering roller and the two second centering rollers to release the pipe.

[0028] Furthermore, in the aforementioned javelin barrel spinning processing device, the structure of the connecting rod assembly connecting the corresponding linkage clamping arm and the active clamping arm includes: a connecting rod, one end of which is hinged to the upper end of the corresponding linkage clamping arm via a first pin, and the other end of which is hinged to the active clamping arm via a second pin.

[0029] Furthermore, in the aforementioned javelin barrel spinning processing device, the structure of the corresponding left-right translation drive mechanism in each spinning unit includes: a spinning servo motor, two support seats, a lead screw, and a nut seat. The nut seat is fixed to the bottom of the spinning slide, and the spinning servo motor and the two support seats are both fixed to the corresponding sliding seats. The lead screw is rotatably supported between the two support seats around its own axis. The output shaft of the spinning servo motor is coaxially connected to the lead screw through a coupling, and the lead screw passes through the nut seat and is threadedly connected to the nut seat.

[0030] Furthermore, in the aforementioned javelin shaft spinning processing device, a spray cooling mechanism is provided on each sliding seat. The spray cooling mechanism consists of nozzles connected to a water source via water pipes, and the nozzle orifices are aligned with the tubular portion between the two sets of spinning rollers of the two spinning units.

[0031] Furthermore, in the aforementioned javelin shaft spinning processing device, a water receiving tank is provided on the base for collecting spray water after cooling the pipe.

[0032] The beneficial effects of implementing the above technical solution are as follows:

[0033] (1) The forming method of combining rotation stretching and radial spinning effectively improves the uniformity of the circumferential wall thickness of the javelin body. The uniform wall thickness of the javelin body is conducive to the uniformity of subsequent quenching heating, avoiding local overheating and burn-through of the tube during quenching, thereby improving the yield and product performance consistency.

[0034] (2) Driven by a programmable servo motor, the radial feed and axial movement speed of the spinning roller can be precisely controlled. Only the javelin shape data and deformation parameters need to be input into the control system to automatically complete the processing of different specifications of shuttle-shaped javelin bodies. It has strong adaptability and high precision.

[0035] (3) Set up a centering mechanism to constrain the radial offset of the tube in real time during the spinning process, so as to ensure the stability and centering of the forming process and further guarantee the forming accuracy. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of a spindle-shaped javelin.

[0037] Figure 2 This is a schematic diagram of the javelin barrel spinning device according to the present invention.

[0038] Figure 3 for Figure 2 Top view.

[0039] Figure 4 for Figure 2 The left view.

[0040] Figure 5 for Figure 2 A three-dimensional image.

[0041] Figure 6 This is a schematic diagram of the pipe spinning mechanism.

[0042] Figure 7 for Figure 6 Top view.

[0043] Figure 8 for Figure 7 A schematic diagram of the AA cross-section.

[0044] Figure 9 This is a schematic diagram of the structure of two sets of spinning rollers.

[0045] Figure 10 This is a schematic diagram showing the usage state of the centering mechanism when clamping the pipe.

[0046] Figure 11 This is a schematic diagram showing the usage state when the centering mechanism loosens the pipe.

[0047] Figure 12 This is a schematic diagram of the pipe rotation mechanism. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0049] First, the javelin shaft spinning apparatus described in this invention will be explained. For example... Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 12 As shown, the javelin body spinning processing device includes a base 1, a tube rotation mechanism 2, two tube end positioning sleeves 3, and a tube spinning mechanism 4; the two tube end positioning sleeves 3 are coaxially and symmetrically arranged on the front and rear sides of the base 1, so that the two ends of the tube 100 can be inserted to support the tube 100.

[0050] The pipe rotation mechanism 2 is installed in the middle of the base 1 to clamp the pipe 100 supported between the two pipe end positioning sleeves 3 and drive it to rotate around its own axis. In this embodiment, the structure of the pipe rotation mechanism 2 includes: a rotation frame 21 installed on the base 1, a base 22 fixed on the rotation frame 21, and a rotating chuck 23 rotatably mounted in the base 22 to clamp the pipe 100. The rotating chuck 23 is a commercially available product, and the rotating chuck has been patented with patent number 202410552681. The invention disclosed in the invention titled "A Method for Quenching Ultra-Thin-Walled Shuttle Tubes" will not be described in detail here. A rotary motor 24 is also installed on the rotary frame 21. The output shaft of the rotary motor 24 is equipped with a synchronous pulley 25. A synchronous belt 26 is wound around the rotary chuck 23 and the synchronous pulley 25. When the rotary chuck 23 clamps the tube 100, the rotary motor 24 can drive the rotary chuck 23 to rotate through the synchronous pulley 25 and the synchronous belt 26, so as to synchronously drive the tube 100 clamped by it to rotate around its own axis.

[0051] A front and rear guide rail assembly 5 extending in the front and rear direction is fixed on the top of the base 1; in this embodiment, a pipe spinning mechanism 4 is provided between each pipe end positioning sleeve 3 and the pipe rotating mechanism 2, that is, the number of pipe spinning mechanisms 4 in this device is two.

[0052] Both pipe spinning mechanisms 4 are slidably mounted on the front and rear guide rail groups 5 on the base 1. Each pipe spinning mechanism 4 is connected to a walking drive mechanism 6. The walking drive mechanism 6 is used to drive the corresponding pipe spinning mechanism 4 to move along the front and rear guide rail groups 5. The pipe spinning mechanism 4 is used to perform radial spinning on the rotating pipe 100.

[0053] Since the structures of all pipe spinning mechanisms 4 are the same, the following description will only take the structure of one of the pipe spinning mechanisms 4 as an example. The pipe spinning mechanism 4 includes: a sliding seat 7 slidably disposed on the front and rear guide rail assembly 5, an alignment mechanism 8 and two spinning units 9 installed on the sliding seat 7, the two spinning units 9 being distributed in a left-right opposite manner, the two spinning units 9 cooperating to perform radial spinning on the rotating pipe 100, the alignment mechanism 8 being used to limit the radial displacement of the pipe 100 when the two spinning units 9 are performing radial spinning on the pipe 100 so that the pipe 100 remains in an aligned state;

[0054] Each spinning unit 9 includes: a left and right guide rail assembly 10 fixed on the sliding base 7 and extending in the left and right direction; a spinning slide 11 slidably disposed on the left and right guide rail assembly 10; the spinning slide 11 is connected to a left and right translation drive mechanism; the left and right translation drive mechanism is used to drive the spinning slide 11 to translate along the left and right guide rail assembly 10; a roller frame 12 is installed at the outer end of the spinning slide 11; a set of spinning rollers 13 for contacting the tube 100 is installed on the roller frame 12; each set of spinning rollers consists of two spinning rollers 13 that are symmetrically distributed vertically and can rotate freely around their own axis.

[0055] The two sets of spinning rollers 13 of the two spinning units 9 can move towards each other and press against the outer peripheral wall of the tube 100 under the synchronous drive of the corresponding left and right translation drive mechanism. Through the cooperation of the walking drive mechanism 6 and the left and right translation drive mechanism, the two sets of spinning rollers 13 of the two spinning units 9 can continuously apply radial spinning force to the rotating tube 100 while moving along the axial direction of the tube 100, so as to process the tube 100 into a shuttle-shaped javelin body.

[0056] In this embodiment, the structure of the walking drive mechanism 6 includes: a rack 61 extending forward and backward on the side wall of the base 1, and a walking servo motor 62 fixedly mounted on the sliding seat 7. An output gear 63 is coaxially mounted on the output shaft of the walking servo motor 62. The output gear 63 meshes with the rack 61. The walking servo motor 62 drives the output gear 63 to walk along the rack 61, so as to synchronously drive the entire pipe spinning mechanism 4 to move along the front and rear guide rail assembly 5.

[0057] In this embodiment, as Figure 10 , Figure 11As shown, the centering mechanism 8 includes: a center frame 81 fixed on the sliding seat 7; a centering cylinder 82 vertically mounted on the top of the center frame 81; the piston rod of the centering cylinder 82 facing downwards and fixed with an active clamping arm 83; a first centering roller 84 rotatably mounted at the bottom end of the active clamping arm 83 for contacting the pipe 100; two linkage clamping arms 85 symmetrically arranged on the left and right sides of the active clamping arm 83; each linkage clamping arm 85 is hinged to the center frame 81 via a central pivot shaft 86 located in the middle; a second centering roller 87 rotatably mounted at the lower end of each linkage clamping arm 85 for contacting the pipe 100; the upper end of each linkage clamping arm 85 is hinged to the active clamping arm 83 via a set of connecting rod assemblies. In this embodiment, the structure of the connecting rod assembly connecting the corresponding linkage clamping arm 85 and the active clamping arm 83 includes... A connecting rod 88 is provided, one end of which is hinged to the upper end of the corresponding linkage clamping arm 85 via a first pin 89, and the other end is hinged to the active clamping arm 83 via a second pin 810. When the centering cylinder 82 drives the active clamping arm 83 to move up and down, the connecting rod assembly can synchronously drive the two linkage clamping arms 85 to swing around their respective central pivot 86. This allows the first centering roller 84 and the two second centering rollers 87 to close together and clamp the pipe 100 to keep the pipe 100 in a centered state, or to open together and release the pipe 100. Since the first centering roller 84 and the two second centering rollers 87 are all in a state of free rotation, when the first centering roller 84 and the two second centering rollers 87 close together and clamp the pipe 100, it will not hinder the rotation of the pipe 100.

[0058] In this embodiment, the structure of the corresponding left-right translation drive mechanism in each spinning unit includes: a spinning servo motor 14, two support seats 15, a lead screw 16, and a nut seat 17. The nut seat 17 is fixed to the bottom of the spinning slide 11. The spinning servo motor 14 and the two support seats 15 are both fixed to the corresponding sliding seats 7. The lead screw 16 is supported between the two support seats 15 and can rotate freely around its own axis. The output shaft of the spinning servo motor 14 is coaxially connected to the lead screw 16 through a coupling 18. The lead screw 16 passes through the nut seat 17 and is threadedly connected to the nut seat 17. When the spinning servo motor rotates forward or backward, it can drive the nut seat 17 to move along the lead screw 16 through the lead screw 16, thereby synchronously driving the spinning slide 11, which is fixed to the nut seat 17, to move along the left and right guide rails 10 to approach or move away from the pipe 100 held by the pipe rotation mechanism 2.

[0059] In this embodiment, a spray cooling mechanism (not shown in the figure) is provided on each sliding seat 7. The spray cooling mechanism consists of nozzles connected to a water source through water pipes. The nozzles are aligned with the pipe section between the two sets of spinning rollers of the two spinning units. A water receiving tank 19 is also provided on the base 1 to collect the spray water after cooling the pipe 100.

[0060] Based on the javelin body spinning device described above, the javelin body spinning method of the present invention uses the following steps to process the straight tube 100 into a shuttle-shaped javelin body, the specific steps of which are as follows:

[0061] S1: Pipe clamping and positioning: The pipe to be processed 100 is passed through the rotating chuck 23 of the pipe rotation mechanism 2, and both ends of the pipe to be processed 100 are inserted and supported in two coaxially symmetrically arranged pipe end positioning sleeves 3. Then, the pipe rotation mechanism 2 located in the middle of the base 1 is started, so that its rotating chuck 23 clamps the pipe 100, thereby completing the axial positioning of the pipe 100.

[0062] S2: Start the rotary motor 24 of the pipe rotation mechanism 2. The output shaft of the rotary motor 24 drives the synchronous wheel 25 to rotate. The synchronous belt 26, which is wrapped around the synchronous wheel 25 and the rotary chuck 23, drives the rotary chuck 23 to rotate, thereby causing the pipe 100 held by the rotary chuck 23 to rotate at a constant speed around its own axis.

[0063] S3: Control the centering mechanism 8 on each pipe spinning mechanism 4 to clamp the pipe 100, thereby limiting its radial displacement during processing and maintaining the centering state. The specific process is as follows:

[0064] The piston rod of the centering cylinder 82 extends downward, pushing the active clamping arm 83 down. The active clamping arm 83 drives the upper ends of the two linkage clamping arms 85 on the left and right sides to move outward through the connecting rods 88 on both sides. This causes the two linkage clamping arms 85 to swing inward synchronously around their respective central axis 86. As a result, the first centering roller 84 installed at the bottom of the active clamping arm 83 and the second centering roller 87 installed at the lower ends of the two linkage clamping arms 85 converge from above and from both sides and contact the outer wall of the pipe 100. The three freely rotatable centering rollers form a stable centering constraint. Without interfering with the rotation of the pipe 100, they only restrict the radial displacement of the pipe 100, ensuring that the pipe 100 always remains in a centered state during the processing.

[0065] S4: The two pipe spinning mechanisms 4 are made to process the pipe 100 from the middle to both ends simultaneously or sequentially. The operation process of the pipe spinning mechanism 4 is as follows:

[0066] S4.1: Radial feed: Simultaneously start the spinning servo motors 14 in the two spinning units 9 on the pipe spinning mechanism 4. Each spinning servo motor 14 drives the corresponding lead screw 16 to rotate through the coupling 18. When each lead screw 16 rotates, it drives the corresponding spinning slide 11 to move along the corresponding left and right guide rail group 10 in the direction of the pipe 100 through the nut seat 17 that is threaded with it. This causes the spinning slides 11 of the two spinning units 9 to move towards each other, and then synchronously drives the spinning rollers 13 of the two spinning units 9 to move towards each other until all four spinning rollers 13 in the two groups contact the outer peripheral wall of the rotating pipe 100 and apply the set initial radial pressure.

[0067] S4.2: Axial feed and synchronous spinning: Start the walking drive mechanism 6 of the pipe spinning mechanism 4, so that the walking servo motor 62 drives the output gear 63 to rotate. Since the output gear 63 meshes with the rack 61 fixed on the base 1, the output gear 63 will walk along the rack 61 when it rotates, thereby driving the entire sliding seat 7 and its centering mechanism 8 and each spinning unit 9 to move smoothly axially along the front and rear guide rail groups 5 at the same time, so that the two sets of four spinning rollers 13 of the two spinning units 9 move axially along the rotating pipe 100.

[0068] During the axial movement of the two sets of four spinning rollers 13 in the two spinning units 9 along the rotating tube 100, the control system adjusts the rotation speed of the spinning servo motors 14 in the two spinning units 9 in real time according to the preset javelin body shape data, thereby dynamically changing the radial position of the two sets of spinning rollers 13, that is, adjusting the radial pressing amount (i.e. spinning force) of the two sets of spinning rollers 13; at the same time, the travel servo motor 62 precisely controls the axial feed speed, and continuously applies a changing radial spinning force to the high-speed rotating tube 100 while the spinning rollers 13 move axially, so that the tube 100 undergoes both radial compression and axial tension at the same time, thereby processing the tube into a shuttle-shaped javelin body with uniform circumferential wall thickness.

[0069] Another pipe spinning mechanism 4 located at the other end of the pipe 100 operates synchronously on the same principle; the two pipe spinning mechanisms 4 advance in coordination from the middle of the pipe to both ends, gradually processing the straight pipe of equal diameter into a streamlined shuttle-shaped structure that is thicker in the middle and thinner at both ends, thus achieving efficient processing; throughout the entire processing process, the centering mechanism 8 in the pipe spinning mechanism 4 at each station always moves closely with the spinning point and clamps the pipe 100, effectively suppressing radial runout and deformation instability during processing.

[0070] During or after spinning, a spray cooling mechanism can be activated to spray cooling water into the high-temperature spinning deformation zone through nozzles for online cooling, thereby controlling the microstructure and properties of the pipe 100.

[0071] Once the javelin body reaches the predetermined size and shape, all moving parts stop and retract in sequence. Each spinning servo motor 14 drives the spinning roller 13 to retract radially. The piston rod of the centering cylinder 82 of each centering mechanism retracts upward to open the centering rollers. Each traveling servo motor 62 drives the corresponding tube spinning mechanism 4 back to its initial position. Finally, the rotating chuck 23 of the tube rotation mechanism 2 releases the tube. At this point, the shaped javelin body can be removed from the tube end positioning sleeve 3.

[0072] The advantages of this invention are:

[0073] (1) The forming method of combining rotation stretching and radial spinning effectively improves the uniformity of the circumferential wall thickness of the javelin body. The uniform wall thickness of the javelin body is conducive to the uniformity of subsequent quenching heating, avoiding local overheating and burn-through of the javelin body during the quenching process, thereby improving the yield and product performance consistency.

[0074] (2) Driven by a programmable servo motor, the radial feed and axial movement speed of the spinning roller can be precisely controlled. Only the javelin shape data and deformation parameters need to be input into the control system to automatically complete the processing of different specifications of shuttle-shaped javelin bodies. It has strong adaptability and high precision.

[0075] (3) Set up a centering mechanism to constrain the radial offset of the tube in real time during the spinning process, so as to ensure the stability and centering of the forming process and further guarantee the forming accuracy.

[0076] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any modifications or equivalent changes made based on the technical essence of the present invention shall still fall within the scope of protection claimed by the present invention.

Claims

1. A javelin barrel spinning processing device, characterized in that: It includes a base, a pipe rotation mechanism, two pipe end positioning sleeves, and a pipe spinning mechanism; The two pipe end positioning sleeves are coaxially and symmetrically arranged on the front and rear sides of the base, so that the two ends of the pipe can be inserted to support the pipe. The pipe rotation mechanism is used to clamp the pipe supported between the two pipe end positioning sleeves and drive it to rotate around its own axis. A front and rear guide rail assembly extending in the front and rear direction is fixed on the top of the base; the pipe spinning mechanism is disposed between two pipe end positioning sleeves and slidably disposed on the front and rear guide rail assembly; the pipe spinning mechanism is connected to a walking drive mechanism, which is used to drive the pipe spinning mechanism to move along the front and rear guide rail assembly. The pipe spinning mechanism is used to perform radial spinning on pipes in a rotating state; The pipe spinning mechanism includes: a sliding seat slidably disposed on the front and rear guide rail assembly, an alignment mechanism and two spinning units installed on the sliding seat, the two spinning units being distributed in a left-right opposite manner, the two spinning units cooperating to perform radial spinning on the rotating pipe, and the alignment mechanism being used to limit the radial displacement of the pipe so as to keep the pipe in an aligned state when the two spinning units perform radial spinning on the pipe; Each spinning unit includes: a left and right guide rail assembly fixed on a sliding base and extending in the left and right direction; a spinning slide block slidably disposed on the left and right guide rail assembly; the spinning slide block is connected to a left and right translation drive mechanism; the left and right translation drive mechanism is used to drive the spinning slide block to translate along the left and right guide rail assembly; a roller frame is installed at the outer end of the spinning slide block; a set of spinning rollers for contacting the tube is installed on the roller frame; each set of spinning rollers consists of two spinning rollers that are symmetrically distributed vertically and can rotate freely around their own axis. The centering mechanism includes: a center frame fixed on a sliding seat; a centering cylinder vertically mounted on the top of the center frame; the piston rod of the centering cylinder facing downwards and fixed with an active clamping arm; a first centering roller for contacting the pipe is rotatably mounted at the bottom end of the active clamping arm; two linkage clamping arms are symmetrically arranged on the left and right sides of the active clamping arm; each linkage clamping arm is hinged to the center frame via a central pivot shaft located in the middle; and a second centering roller for contacting the pipe is rotatably mounted at the lower end of each linkage clamping arm.

2. The javelin barrel spinning device according to claim 1, characterized in that: The pipe slewing mechanism includes: a slewing frame mounted on a base, a seat fixed on the slewing frame, a rotatable chuck for clamping the pipe rotatably mounted in the seat, a slewing motor mounted on the slewing frame, a synchronous pulley mounted on the output shaft of the slewing motor, and a synchronous belt wound around the slewing and the synchronous pulley. When the slewing clamps the pipe, the slewing motor drives the slewing to rotate through the synchronous pulley and the synchronous belt, thereby synchronously driving the pipe clamped by it to rotate around its own axis.

3. The javelin barrel spinning device according to claim 1, characterized in that: The structure of the walking drive mechanism includes: a rack extending forward and backward fixedly mounted on the side wall of the base, and a walking servo motor fixedly mounted on the sliding seat. An output gear is coaxially mounted on the output shaft of the walking servo motor. The output gear meshes with the rack. The walking servo motor drives the output gear to walk along the rack, thereby synchronously driving the tube spinning mechanism to move along the front and rear guide rails.

4. The javelin barrel spinning device according to claim 1, characterized in that: The upper end of each linkage clamping arm is hinged to the active clamping arm through a set of connecting rod assemblies. When the centering cylinder drives the active clamping arm to move up and down, the connecting rod assembly can synchronously drive the two linkage clamping arms to swing around their respective central axis. This allows the first centering roller and the two second centering rollers to close together to clamp the pipe and keep it in a centered state, or to open up the first centering roller and the two second centering rollers to release the pipe.

5. The javelin barrel spinning device according to claim 4, characterized in that: The structure of the linkage assembly connecting the corresponding linkage arm and the active clamping arm includes: a linkage, one end of which is hinged to the upper end of the corresponding linkage arm via a first pin, and the other end of which is hinged to the active clamping arm via a second pin.

6. The javelin barrel spinning device according to claim 1, characterized in that: The structure of the corresponding left-right translation drive mechanism in each spinning unit includes: a spinning servo motor, two support seats, a lead screw, and a nut seat. The nut seat is fixed to the bottom of the spinning slide. The spinning servo motor and the two support seats are fixed to the corresponding sliding seats. The lead screw is supported between the two support seats and can rotate freely around its own axis. The output shaft of the spinning servo motor is coaxially connected to the lead screw through a coupling. The lead screw passes through the nut seat and is threadedly connected to the nut seat.

7. The javelin barrel spinning device according to claim 1, characterized in that: Each sliding seat is equipped with a spray cooling mechanism, which consists of nozzles connected to a water source via water pipes. The nozzles are aligned with the pipe section between the two sets of spinning rollers of the two spinning units.

8. The javelin barrel spinning device according to claim 7, characterized in that: A water collection tank is provided on the base to collect the spray water after cooling the pipes.

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