The highlights of the line pipe processing method you do not understand
The processing of rifling is made with special tools such as brooch, but even with the same brooch, affected by workers and manufacturing equipment, even the same product from the same manufacturer cannot have exactly the same twist. In other words, it is impossible to create a gun with the same marking. Here we talk about the method of making the line tube.
Line tube processing method
Scraper method
Using a steel rod with a slightly more inner diameter than the pistol, a groove is carved in a specific part of the pistol, and a hard alloy steel plate is mounted. The steel piece has one or two protruding strips with a certain inclination angle, and the front end is favorable. Cut part and adjust the height of the protrusion. Pull back and forth several times on a squatting line to cut out a haze line, then adjust the position and cut the next one. In this method, odd-numbered or even-numbered strands are generally used as a single scraper, and even-numbered strands can be used as two-way scrapers. It is also possible to install a single, double or triple knife in opposite positions and cut out 2 to 6 twist lines at a time.
2. Hook knife drawing method
The hook cutter is placed on a steel rod slightly smaller than the diameter of the barrel, and the height of the edge of the hook blade can be adjusted by adjusting the screw of the tie rod part. Each pull through the barrel once, the lever moves a few microns, with the uniform rotation of the barrel, broaching a certain degree of obscurity of the haze line, reach the predetermined width, and then change position to pull the second twist line. In the early days, the rifled gun pulled a haze line as long as it was pulled about twenty times, and a good gun pulled the same haze line about one hundred times. The more pulls are made, the finer and more precise the draw grooves are.
Earlier American colonialists used a hook cutter method to make a twist line. The tool used was a simple manual wood machine, and the colonists could make it themselves.
3. Combination circular knife drawing method
25 to 30 cemented carbide steel rings are fixed on a tie rod, the distance between each steel ring is equal, and each steel ring is processed with the same number of squeegee blades as the number of haze lines, each of which can be followed by The tangent angle is connected to the cutter on the next ring, and it can be considered as a spiral line from the end to the end. The amount of protrusion of each blade on the ring is slightly larger than that of the previous ring, forming a series of cutting knives. The slot that is opened has a stable width, depth, and spacing. This type of combined circular broaching tool passes through the rifle. It can cut out all the haze lines, shorten the working time, and increase the output and quality.
4. Top cone (or punch line) squeeze JE method
With a mid-section cross-sectional shape and the same shape of the inner section of the coil in the hard alloy (such as tungsten carbide) without tip warhead cone, through the gun barrel aperture diameter is slightly smaller than the top cone, the barrel metal in the top cone of the top Under pressure, through the rifle, the inner diameter of the cymbal increases slightly, and the outer surface of the top cone extrudes through the inner wall of the cymbal to form a deformation, that is, the haze line, and the depression is formed along the rifle and pressed against the inner shadow. . And due to the great pressure it suffers, the metal density on the inner surface of the crucible increases and the hardness increases. At the same time, we completed the process of hinge removal and the production of twist lines. The inner wall of the bowl becomes smooth due to the hard and smooth surface of the top cone. Make the life of the barrel doubled. This method was first invented by the Germans. Since the 1970s, it has been widely adopted in the production of barrels.
5. Cold forging
The barrel radial cold forging forming technology is essentially a precision rotary forging shaft process type, and is a method without chip precision molding. The cold precision forging process is to forge the barrel blank and the magazine at a time on the professional precision forging machine. The accuracy of the inner spindle is guaranteed by the mandrel. As the precision forging process can improve the strength of the barrel, firing accuracy, and then increase the life of the barrel, reduce the initial speed drop, played a key role in improving the performance of firearms. Western forged technology is widely used in developed countries. China also introduced this technology in the 1980s.
Regardless of the method used to make the rifling, observation under a sufficiently large microscope has many cracks remaining in the groove of the groove, like the zigzag direction of the squeegee. Even after polished to chrome, it can still be observed. The translation of the cutting process will produce a random pull groove distance change, forming a stable feature. The material of the barrel steel is not absolutely homogenous, and some places on the inner wall of the tube must be harder, and the scraper can be processed to have different effects at this time.
Metallic debris will have a microscopic change in diameter, which will be detected when firing: Warheads will produce repetitive marks on the soft metal. That is, after using the top cone and then polishing to Mohs 8 to achieve the mirror effect, there will also be its family characteristics (the same characteristics of the top cone made of left), because the top cone has a slight difference due to processing . With the increase in the number of shots. Will produce random wear. Rust spots and chemical gas corrosion marks form individual differences. In the production, the factory will prepare more than two top cones on an extruder, which is usually used randomly and alternately. It is not specific that one top cone will squeeze several barrels at a time. A process shop will have more than one extruder operating at the same time. Although a tip cone theoretically can extrude more than a thousand barrels, each batch of barrels will have a slight difference in rifling. As long as the magnification is sufficiently large, it can distinguish the characteristics of the family.
The above is a brief introduction for Xiaobian. If you want to know more related information, please continue to pay attention to Qijia Consulting. More exciting consultation, please stay tuned.
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