Simulation method capable of realizing radial precision forging bore
Through the combination of DEFORM-3D software and DEFORM-MO module, high-precision simulation of radial fine-forged rifle is achieved, the problem of precision-forged rifle simulation in the existing technology is solved, the strength and shooting accuracy of the barrel are improved, and theoretical support for process parameters is provided.
Patent Information
- Application Number
- CN202510567903.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2025-08-15
AI Technical Summary
The prior art is difficult to achieve high-precision radial precision forging rifle simulation, which affects the strength and shooting accuracy of the barrel, and lacks an independent and controllable manufacturing mechanism.
Using DEFORM-3D metal plastic forming simulation software, by defining the movement direction and grid division of the hammer head, combined with the DEFORM-MO multi-station continuous simulation module, 4 hammer heads are simulated to move in the barrel direction and the reverse direction at the same time, and repeating 125 cycles to achieve the simulation of radial precision forging bore.
It improves simulation accuracy, provides a theoretical basis for process parameter optimization, improves the strength and shooting accuracy of the barrel, and realizes an independent and controllable manufacturing process.
Smart Images
Figure CN120493427A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of gun barrel precision forging, and in particular to a simulation method capable of realizing radial precision forging of rifles. Background Art
[0002] The rifling of the barrel is composed of 6 positive lines distributed on the inner wall of the barrel in a spiral with a certain lead. The precision forging process can improve the strength and shooting accuracy of the barrel, thereby increasing the service life of the barrel, which plays a key role in improving the performance of the firearm.
[0003] It is necessary to study the manufacturing mechanism of forging simulated rifling of small-caliber gun barrels using special precision forging machines to achieve independent control. Summary of the Invention
[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for simulating radial precision forging rifles, thereby realizing the simulation of radial precision forging rifles.
[0005] The object of the present invention is achieved like this:
[0006] A simulation method for realizing radial precision forging of a rifling comprises the following steps:
[0007] ①Simulation pre-processing:
[0008] Create 3D models of the hammer head, barrel blank, and core rod, and import the created 3D models into simulation software;
[0009] ②Define the inward movement direction of the hammer head:
[0010] According to the reference system coordinates, define the actual inward movement direction of the hammer head;
[0011] ③Determine the position where the hammer starts forging:
[0012] The position where the hammer starts forging is offset outward toward the outer wall of the barrel;
[0013] ④Define contact parameters
[0014] Contact parameters select cold forging parameters;
[0015] ⑤ Grid marking of the barrel, hammer head and core rod
[0016] A section of the gun barrel is cut for simulation. The length of the cut section is less than 1 / 2 of the total length of the gun barrel. The number of grids in the cut section of the gun barrel is defined to be more than 2 times the number of grids in the mandrel. The number of grids in the mandrel is defined to be more than 20 times the number of grids in the hammer head.
[0017] ⑥Define the outward movement direction of the hammer
[0018] The forging process is a reciprocating process. After the hammer moves inward, it also moves outward. The direction of the hammer's outward movement is defined as being opposite to the direction of its inward movement.
[0019] ⑦ Define the movement of the barrel blank when the hammer moves outward
[0020] Define the feed speed and rotation angle of the barrel blank along the negative direction of the z-axis;
[0021] ⑧Simulation
[0022] The simulation control runs and the simulation results are obtained.
[0023] Preferably, the method further includes step ⑨ post-processing the simulation results: forging rifling on the inner wall of the barrel, and partially amplifying the simulation result schematic diagram in various directions to observe the precision forging quality of the rifling.
[0024] Preferably, the simulation software adopts DEFORM-3D metal plastic forming simulation software, and selects DEFORM-MO multi-station continuous simulation module, and adds AISI-1015 as the barrel material.
[0025] Preferably, an Intel Platium 8268 processor-based dedicated simulation computer is used to run the simulation software.
[0026] Preferably, the difficulty of this patent is that the actual movement direction of the hammer head when it moves inward and outward must be consistent with the definition of the deform reference coordinate.
[0027] This movement direction definition is related to the movement direction of the hammer head. The difficulty is to first define the directions of the four hammer heads to move simultaneously and coordinately toward the axis of the barrel, and then simultaneously define the four hammer heads to move coordinately in the opposite direction of the barrel. This is the process of the hammer head forging the barrel.
[0028] The simulation simulates the movement relationship of the four eccentric shafts moving 3.5mm in the axial direction of the barrel and then moving 3.5mm in the opposite direction of the barrel, with a total stroke of 7mm.
[0029] Using the mo module of deforem, the above process of hammer forging the barrel is repeated 125 times, and the effect achieved is to realize the simulation of radial precision forging rifling.
[0030] Preferably, the movement speed of the hammer is defined as 680 m / s;
[0031] The starting point of the hammer forging is offset 3.5mm from the outer wall of the barrel;
[0032] The cold forging parameter is selected as 0.12;
[0033] Define the gun barrel segment with 200,000 meshes, the hammer head with 3,200 meshes, and the core rod with 90,000 meshes. To improve the accuracy of the gun barrel blank simulation, a section of the gun barrel is cut for simulation and 200,000 meshes are divided on this section of the gun barrel.
[0034] The barrel blank has a feed motion speed of 1 m / s along the negative direction of the z-axis and a rotation motion angle of 22.5 degrees.
[0035] Preferably, four hammers are used to forge the barrel toward the barrel at the same time, and then the four hammers move outward at the same time, away from the barrel movement, and then the cycle is repeated 100 times, 125 steps are simulated, and the simulation results are obtained.
[0036] The existing rotary forging of tubular workpieces uses a step function to simulate the motor input, inputting power to the transition gear. Through the coordinated rotation of the transition gear, the power is transmitted to the four main gears. The main gears simultaneously drive the rotation of four 3.5mm eccentric shafts. The eccentric portion of the eccentric shaft is connected to the slider through a bearing, converting the eccentric shaft's circular motion into the slider's linear motion. A connecting piece exists between the slider and the turbine and worm. A sliding pair is added between the worm and the hammer housing. The worm has a hammer seat for installing the hammer. Finally, the motion curve of the four hammer seats along the forging direction of the barrel is tested. The motion curve is a sine curve with an envelope.
[0037] The difference of this patent application is that the deformation simulation directly defines the movement direction of the hammer head. It is a linear relationship, without the interference caused by the movement of the precision forging machine mechanism, and the simulation accuracy is higher.
[0038] The progress made is to use AISI-1015 material, and use the deform software to simulate σ, which is the stress, in MPa, to calculate the contact area S between the hammer and the barrel when forging the barrel. By F=σ×S, the forging force F of the precision forging machine hammer can be calculated. Calculate the contact area S of a single hammer when forging the barrel = 210mm 2 , σ=816Mpa, F=171.4kN, using new 5.8mm automatic rifle barrel (30CrNi3MoVMA) material, σ=1950Mpa, F=410kN, completing the digital prototype simulation forging of the new 5.8mm automatic rifle barrel (30CrNi3MoVMA), the calculated hammer forging force is in the technical indicators range of 350kN~430kN.
[0039] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:
[0040] The simulation method of the present invention is original and realizes the functional simulation of the radial precision forging rifle simulation principle model. The research results can provide a theoretical basis and technical support for the optimization of process parameters in actual processing. BRIEF DESCRIPTION OF THE DRAWINGS
[0041] Figure 1 Imported 3D simulation models of hammer head, barrel blank, and mandrel;
[0042] Figure 2 Definition of the direction of the hammer's inward movement;
[0043] Figure 3 The hammer head below moves along the negative direction of the y-axis;
[0044] Figure 4 The upper hammer moves along the positive direction of the y-axis;
[0045] Figure 5 The hammer head on the right moves along the negative direction of the x-axis;
[0046] Figure 6 The left hammer moves along the positive direction of the x-axis;
[0047] Figure 7 Determination of hammer forging position;
[0048] Figure 8 Define contact parameters;
[0049] Figure 9 Schematic diagram of the gun barrel grid;
[0050] Figure 10 Schematic diagram of hammer head scratching grid;
[0051] Figure 11 Schematic diagram of mandrel gridding;
[0052] Figure 12a 、 Figure 12b Define a schematic diagram for the direction of the hammer's outward movement;
[0053] Figure 13 The movement of the barrel blank as the hammer moves outward;
[0054] Figure 14 Simulation 125step schematic diagram;
[0055] Figure 15a 、 Figure 15b Schematic diagram of simulation results. DETAILED DESCRIPTION
[0056] The original intention of the design of the present invention is to realize the simulation of precision forging rifling, and the DEFORM-MO module is used to perform the simulation process of rifling simulation pre-processing, simulation, and simulation post-processing. The simulation process has high requirements on computer performance, because a section of the barrel blank is divided into 200,000 grids, which is a high-precision simulation. The simulation results can provide theoretical and technical support for precision forging rifling. The difficulty of this patent is that the actual movement direction of the hammer head when moving inward and outward must be consistent with the definition of the deform reference coordinate and must be accurately added. The innovation of this patent is that ① the motion parameters and grid parameters of the barrel blank, hammer head, and core rod are refined, and the simulation parameters realize the simulation of the barrel rifling. ② Innovative thinking comes up with a step-by-step simulation idea that in the first step, the four hammer heads simultaneously forge the barrel in the direction of the barrel, and in the second step, the four hammer heads simultaneously move outward away from the barrel. Then, this cycle is repeated 100 times, and 125 simulation steps are simulated to produce the simulation results. This simulation method is the first of its kind and realizes the functional simulation of the radial precision forging rifling simulation principle model. The research results can provide theoretical basis and technical support for the optimization of process parameters in actual processing.
[0057] Specifically:
[0058] ①Simulation pre-processing: Import the three-dimensional models of hammer head, barrel blank and core rod into DEFORM-3D metal plastic forming simulation software, select DEFORM-MO multi-station continuous simulation module, add material AISI-1015, such as Figure 1 As shown;
[0059] ② Define the inward movement of the hammer: This movement direction definition is related to the movement direction of the hammer. The difficulty is to first define the directions of the four hammers to move in the axial direction of the barrel at the same time, and then define the four hammers to move in the opposite direction of the barrel at the same time. This is the process of the hammer forging the barrel. The simulation simulates the movement of the four eccentric shafts in the axial direction of the barrel by 3.5mm at the same time, and then moves 3.5mm in the opposite direction of the barrel, for a total movement relationship of 7mm. The difficulty lies in using the mo module of deforem to repeat the above process of hammer forging the barrel 125 times. The effect achieved is to realize the simulation of radial precision forging rifling. According to the reference system coordinates, define the actual movement direction of the hammer, with a speed of 680m / s, such as Figure 2 As shown; In order to better understand the direction of movement of the hammer, Figure 3-Figure 6 Added schematic diagrams for the specific movement directions of the four hammer heads;
[0060] ③ Define the starting position of the hammer head forging: offset 3.5mm outward from the outer wall of the barrel, such as Figure 7 As shown;
[0061] ④ Define the contact parameter as cold forging parameter is 0.12, such as Figure 8 As shown;
[0062] ⑤ Define the grid: 200,000 grids for the barrel, 3,200 grids for the hammer head, and 90,000 grids for the core rod. In order to improve the accuracy of the barrel blank simulation, a small section of the barrel is cut for simulation. 200,000 grids are divided on this small section of the barrel. This is equivalent to doubling the number of grids per unit volume compared to dividing the entire barrel into 200,000 grids. A dedicated simulation computer with an Intel Platinum 8268 processor (24 cores and 48 threads) is required. The grid division diagram is shown below. Figures 9-11 As shown;
[0063] ⑥ Define the hammer head to move outward. The forging process is a reciprocating process. After the hammer head moves inward, it also moves outward. It can be seen that the two frames in the lower left corner have a darker color from the first to the second. The DEFORM-MO multi-station continuous simulation module used here is cycled 100 times. The direction of the hammer head movement is exactly opposite to the direction of the hammer head movement in ①, as shown in Figure 12;
[0064] ⑦ The barrel blank is fed along the negative direction of the z axis at 1 m / s and rotated at 22.5 degrees, such as Figure 13 shown.
[0065] ⑧Simulation: After running the simulation control for 125 steps, the simulation results can be obtained, such as Figure 14 shown.
[0066] Simulation Post-processing ⑨ Post-processing of simulation results: Rifling is forged on the inner wall of the barrel, and the schematic diagram is partially enlarged in all directions, as shown in Figure 15.
[0067] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.
Claims
1. A simulation method capable of realizing radial precision forging of rifling, characterized in that: The following steps are involved: ①Simulation pre-processing: Create 3D models of the hammer head, barrel blank, and core rod, and import the created 3D models into simulation software; ②Define the inward movement direction of the hammer head: According to the reference system coordinates, define the actual inward movement direction of the hammer head; ③Determine the position where the hammer starts forging: The position where the hammer starts forging is offset outward toward the outer wall of the barrel; ④Define contact parameters Contact parameters select cold forging parameters; ⑤ Grid marking of the barrel, hammer head and core rod A section of the gun barrel is cut for simulation. The length of the cut section is less than 1 / 2 of the total length of the gun barrel. The number of grids in the cut section of the gun barrel is defined to be more than 2 times the number of grids in the mandrel. The number of grids in the mandrel is defined to be more than 20 times the number of grids in the hammer head. ⑥Define the outward movement direction of the hammer The forging process is a reciprocating process. After the hammer moves inward, it also moves outward. The direction of the hammer's outward movement is defined as being opposite to the direction of its inward movement. ⑦ Define the movement of the barrel blank when the hammer moves outward Define the feed speed and rotation angle of the barrel blank along the negative direction of the z-axis; ⑧Simulation The simulation control runs and the simulation results are obtained.
2. A simulation method capable of realizing radial precision forging of rifling according to claim 1, characterized in that: It also includes step 9 post-processing of the simulation results: forging rifling on the inner wall of the barrel, and partially amplifying the simulation result schematic in various directions to observe the precision forging quality of the rifling.
3. The simulation method for realizing radial precision forging of a rifle according to claim 1, characterized in that: The simulation software used was DEFORM-3D metal plastic forming simulation software, and the DEFORM-MO multi-station continuous simulation module was selected, and the barrel material was added as AISI-1015.
4. The method for simulating radial precision forging of a rifle according to claim 3, wherein: The simulation software is run on a dedicated simulation computer with an Intel Platium 8268 processor.
5. The method for simulating radial precision forging of a rifle according to claim 3, wherein: When the hammer moves inward or outward, the actual movement direction is consistent with the definition of the deform reference coordinate.
6. The method for simulating radial precision forging of a rifle according to claim 1, characterized in that: The speed of the hammer is defined as 680 m / s; The starting point of the hammer forging is offset 3.5mm from the outer wall of the barrel; The cold forging parameter is selected as 0.12; Define the gun barrel segment with 200,000 meshes, the hammer head with 3,200 meshes, and the core rod with 90,000 meshes. To improve the accuracy of the gun barrel blank simulation, a section of the gun barrel is cut for simulation and 200,000 meshes are divided on this section of the gun barrel. The barrel blank has a feed motion speed of 1 m / s along the negative direction of the z-axis and a rotation motion angle of 22.5 degrees.
7. The simulation method for realizing radial precision forging of rifling according to claim 1, characterized in that: Four hammers are used to forge the barrel simultaneously. Afterwards, the four hammers move outward simultaneously, away from the barrel. The cycle is repeated and the simulation is performed to obtain the simulation results.