A method for machining various types of gun barrel rifling using a CNC machine tool and a gun barrel structure

Abstract

This invention relates to the field of gun barrel technology, specifically a method and structure for machining various types of gun barrel rifling using a CNC machine tool. The machining method includes the following steps: S1: Generate a three-dimensional model of the gun barrel rifling, dividing the gun barrel into three equal parts; S2: Machining the outer and inner diameters of the rifling inner wall tube, dividing the rifling inner wall tube into three equal parts; S3: Machining the grooves on the inner bore of each of the three rifling inner wall tubes, milling chamfers; S4: Welding the three rifling inner wall tubes together to form a single rifling inner wall tube, turning it to the specified design outer diameter; S5: Chamfering the weld joints on the end faces of the rifling outer wall tube, machining its inner bore and outer diameter; S6: Press-fitting the rifling inner wall tube into the rifling outer wall tube and welding its two end faces; S7: Precision turning the outer diameter of the entire rifling gun barrel, and boring the inner bore; This invention allows for custom rifling dimensions and machining of different types of rifling; no special equipment is required; the machining method is simple.

Description

Technical Field

[0001] This invention relates to the field of gun barrel technology, and in particular to a method for machining various types of gun barrel rifling using a CNC machine tool and a gun barrel structure. Background Technology

[0002] Rifling, also known as rifling grooves, is the soul of a gun barrel. It gives the bullet the ability to spin, allowing it to maintain its intended direction after leaving the barrel.

[0003] Rifling is a spiral pattern forged into the inner wall of gun barrels and cannon barrels. It consists of two parts: raised lines and recessed lines. Raised lines are the convex parts of the inner wall of the barrel, while recessed lines are the concave parts. In modern gun barrels, the depth of the recessed lines is mostly between 0.004 and 0.006 inches.

[0004] Twist is the distance the rifling in the barrel travels in one revolution. The smaller the twist, the higher the rotational speed of the bullet and the better its stability. However, if the twist is too large, the bullet will become unstable, meaning it loses its stability before hitting the target.

[0005] Rifling is similar to threaded steel, with the twist rate analogous to the lead of a threaded steel pipe. However, unlike the lead, the twist rate of rifling is generally longer, and the barrel caliber is relatively small, making it difficult to machine the internal rifling using a lathe. Common rifling manufacturing methods include: cold extrusion, electrochemical machining, multi-point broaching, die extrusion, hammer forging, broaching, and forging.

[0006] The above methods for processing rifling all require specific machine tools or molds, and the machine tools and molds are limited in scope. For example, a broaching machine or stamping head for 7.62mm rifling cannot process 12.7mm rifling.

[0007] During the design and testing of new guns or new rifling, it is usually necessary to continuously adjust the rifling dimensions to meet product requirements. In order to solve the above problems, a simple method for machining various types of gun barrel rifling using CNC machine tools has been developed. Summary of the Invention

[0008] To solve the above-mentioned technical problems, the present invention provides a method for machining various types of gun barrel rifling using a CNC machine tool and a gun barrel structure, characterized in that the machining method comprises the following steps:

[0009] S1: Based on the rifling size design requirements, a three-dimensional model of the barrel rifling is generated through three-dimensional modeling, and the barrel is divided into three equal parts using three-dimensional modeling software, with each part of the barrel model having specific rifling.

[0010] S2: The outer diameter of the rifling inner wall tube is machined by lathe, and the inner diameter of the rifling inner wall tube is machined by boring machine. Machining allowance is left for both the outer and inner diameters of the rifling inner wall tube. Then the rifling inner wall tube is divided into three equal parts by wire cutting.

[0011] S3: Import the rifling shape after 3D modeling into the CNC milling machine, and machine the grooves on the inner wall of the rifling tube 1, rifling tube 2 and rifling tube 3 respectively, and mill the chamfer for welding.

[0012] S4: After milling, fix the rifling inner wall tube 1, rifling inner wall tube 2 and rifling inner wall tube 3 relatively, and weld them at the weld joint. After welding, they form a whole section of rifling inner wall tube. Then, use a lathe to process the welded inner wall tube to the specified design outer diameter.

[0013] S5: The outer wall of the rifling tube and the end face weld chamfer are machined by lathe, and the inner hole is machined by boring machine. The outer diameter of the rifling tube is machined with a machining allowance for later precision machining.

[0014] S6: Press the inner wall tube of the rifling into the outer wall tube of the rifling. After pressing, align the two ends and weld the two end faces through the reserved weld joint.

[0015] S7: After welding, the outer diameter of the entire rifling barrel is precision machined, and the inner hole is machined on a boring machine. After machining to the design value, the rear part of the barrel can be further machined using a conventional machine tool.

[0016] Preferably, the barrel structure includes: an outer rifling tube, an inner rifling tube one, an inner rifling tube two, and an inner rifling tube three. The outer rifling tube is a high-strength alloy steel tube, which is interference-fitted onto the outer side of the inner rifling tube one, the inner rifling tube two, and the inner rifling tube three. After welding, it forms a complete inner rifling tube. The two ends are then welded to form a complete barrel. The inner rifling tube one, the inner rifling tube two, and the inner rifling tube three are made of seamless steel tubes, and each of their sides has a weld on its upper side.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. Compared with traditional processing methods, the processing method of this invention is highly customizable, allowing for customized rifling dimensions and processing of different types of rifling;

[0019] 2. Compared to traditional processing methods, no special equipment is required for processing;

[0020] 3. Compared with traditional processing methods, the processing method is simple. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely embodiments of the present invention.

[0022] Figure 1 Schematic diagram of the structure of the rifling inner wall tube 1, rifling inner wall tube 2 and rifling inner wall tube 3;

[0023] Figure 2 This is a schematic diagram of the gun barrel being divided into three equal parts in step S1.

[0024] Figure 3 for Figure 1 Side view;

[0025] Figure 4 This is a cross-sectional view of the inner wall of the rifling chamber after machining according to the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of step S6;

[0027] Figure 6 This is a schematic diagram of the structure of step S7;

[0028] Figure 7 for Figure 6 Side view;

[0029] Figure 8 for Figure 6 Side view;

[0030] In the diagram: 1-Rifling inner wall tube one, 2-Rifling inner wall tube two, 3-Rifling inner wall tube three, 4-Chamfer for welding, 5-Corrugated groove, 6-Rifling outer wall tube, 7-Bullet chamber; Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solution of this equipment, the following detailed description of the equipment is provided in conjunction with the accompanying drawings.

[0032] A method for machining various types of gun barrel rifling using a CNC machine tool and a gun barrel structure, characterized in that the machining method comprises the following steps:

[0033] S1: Based on the rifling size design requirements, a three-dimensional model of the barrel rifling is generated through three-dimensional modeling. The barrel is then divided into three equal parts using three-dimensional modeling software: rifling inner wall tube one, rifling inner wall tube two, and rifling inner wall tube three. Each barrel model has a specific rifling.

[0034] S2: The outer diameters of the separate rifling inner wall tubes 1, 2, and 3 are machined separately using a lathe, and the inner diameters of the separate rifling inner wall tubes 1, 2, and 3 are machined separately using a boring machine. Roughing: spindle speed between 1500-1800 rpm, roughing cutting amount of 0.75-1.0 mm, feed rate of 80 mm / min. Leave a 2 mm machining allowance for both the outer and inner diameters of the rifling inner wall tubes. Then, the rifling inner wall tubes are evenly divided into three parts by wire cutting.

[0035] S3: Import the rifling shape after 3D modeling into the CNC milling machine, and machine the grooves on the inner wall of the rifling tube 1, rifling tube 2 and rifling tube 3 respectively, and mill the chamfer for welding.

[0036] S4: After milling, fix the rifling inner wall tubes 1, 2, and 3 relatively. Weld them at the chamfered joints between the two rifling inner wall tubes to form a single rifling inner wall tube. The welded tube is then machined on a lathe (leaving a 2mm allowance for machining). Rifling finishing: spindle speed between 1200-1300 rpm, roughing cut of 0.05mm, feed rate of 200mm / min; turn to the specified design outer diameter.

[0037] S5: The rifling outer wall tube and its end face weld chamfer are machined on a lathe, and its inner hole is machined on a boring machine. Roughing: spindle speed between 1500-1800 rpm, roughing cutting amount is 0.75-1.0 mm, feed rate is 80 mm / min; a 2 mm machining allowance is left for the outer diameter of the rifling outer wall tube for subsequent finish machining.

[0038] S6: Press the inner wall tube of the rifling into the outer wall tube of the rifling. After pressing, align the two ends and weld the two end faces through the reserved weld joint.

[0039] S7: After welding, the outer diameter of the entire rifling barrel is precision turned, and the inner hole is machined on a boring machine. For finishing, the spindle speed is between 1200-1300 rpm, the roughing cutting amount is 0.05-0.1 mm, and the feed rate is 60 mm / min. After machining to the design value, the rear chamber of the barrel can be further machined using a conventional machine tool.

[0040] In some embodiments, the barrel structure includes: an outer rifling tube, an inner rifling tube one, an inner rifling tube two, and an inner rifling tube three. The outer rifling tube is a high-strength alloy steel tube, which is interference-fitted onto the outer side of the inner rifling tube one, the inner rifling tube two, and the inner rifling tube three. After welding, it forms a complete inner rifling tube. The two ends are then welded to form a complete barrel. The inner rifling tube one, the inner rifling tube two, and the inner rifling tube three are made of seamless steel tubes and are processed by wire cutting. The three parts can be combined into a complete round barrel, with each section having an angle of 120°. Each side of the barrel has a weld joint for easy subsequent welding.

[0041] The above-described embodiments are merely examples of several implementations of the present invention, and their descriptions are quite specific. However, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be determined by the appended claims.

Claims

1. A method for machining various types of gun barrel rifling using a CNC machine tool, characterized in that, The processing method steps are as follows: S1: Based on the rifling size design requirements, a three-dimensional model of the barrel rifling is generated through three-dimensional modeling, and the barrel is divided into three equal parts using three-dimensional modeling software, with each part of the barrel model having specific rifling. S2: The outer diameter of the rifling inner wall tube is machined by lathe, and the inner diameter of the rifling inner wall tube is machined by boring machine. Machining allowance is left for both the outer and inner diameters of the rifling inner wall tube. Then the rifling inner wall tube is divided into three equal parts by wire cutting. S3: Import the rifling shape after 3D modeling into the CNC milling machine, and machine the grooves on the inner wall of the rifling tube 1, rifling tube 2 and rifling tube 3 respectively, and mill the chamfer for welding. S4: After milling, fix the rifling inner wall tube 1, rifling inner wall tube 2 and rifling inner wall tube 3 relatively, and weld them at the weld joint. After welding, they form a whole section of rifling inner wall tube. Then, use a lathe to process the welded inner wall tube to the specified design outer diameter. S5: The outer wall of the rifling tube and the end face weld chamfer are machined by lathe, and the inner hole is machined by boring machine. The outer diameter of the rifling tube is machined with a machining allowance for later precision machining. S6: Press the inner wall tube of the rifling into the outer wall tube of the rifling. After pressing, align the two ends and weld the two end faces through the reserved weld joint. S7: After welding, the outer diameter of the entire rifling barrel is precision machined, and the inner hole is machined on a boring machine. After machining to the design value, the rear part of the barrel can be further machined using a conventional machine tool.

2. The gun barrel structure according to claim 1, which utilizes a CNC machine tool to process various types of gun barrel rifling, is characterized in that... The barrel structure includes: an outer rifling tube, an inner rifling tube I, an inner rifling tube II, and an inner rifling tube III. The outer rifling tube is a high-strength alloy steel tube, which is interference-fitted onto the outer side of the inner rifling tube I, inner rifling tube II, and inner rifling tube III after welding to form a single section of inner rifling tube. The two ends are then welded together to form a single barrel section. The inner rifling tube I, inner rifling tube II, and inner rifling tube III are made of seamless steel tubes, and each of their sides has a weld joint on its upper side.

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