In fact, it’s no wonder that Bai Yi would sigh. If we want to trace the origin, the bolt assembly in Bai Yi’s plan is actually quite related to the Soviet SVT-40 semi-automatic rifle, because this bolt assembly is based on the famous name of later generations.

It is improved from the bolt assembly in the Type 56 semi-automatic rifle.

The Soviet SKS semi-automatic rifle copied from the Type 56 semi-automatic rifle was designed after fully referring to and absorbing the advantages of the SVT-40 semi-automatic rifle. If we really want to talk about it, Bai Yi's new gun plan is different from the SVT-40 semi-automatic rifle.

They can be considered a pair of distant cousins.

However, cousins ​​are cousins. After all, the two are fundamentally different. At least in terms of structure, Boyi's plan to absorb the Type 56 semi-automatic bolt assembly is much simpler than the original bolt assembly of the SVT-40 semi-automatic rifle.

It is also much more reliable. You must know that although the SVT-40 semi-automatic rifle uses a bolt offset locking mechanism.

However, due to the historical conditions at the time and the limitations of the designer, the composition of the bolt assembly was still a bit complicated. The most typical one is that the bolt frame of the SVT-40 semi-automatic rifle was designed as a concave that required precision machining.

Groove, use this groove to drive the lower bolt to achieve offset opening and closing.

However, the Type 56 semi-automatic rifle simplifies this complex bolt assembly into a pair of hook-shaped sears that are hooked to each other. This not only reduces nearly two-thirds of the machining workload in production, but also greatly saves money.

The production time and cost are reduced, and the durability, serviceability and reliability of the simplified bolt assembly are also greatly improved.

Because this almost open hook-like closure device is almost immune to severe cold, wind, sand, mud and other harsh substances and environments. Not to mention anything else, the Type 56 semi-automatic rifle of the Chinese army at that time was very cold outside the Great Wall in the north and wet and cold in the south.

The tropical jungles, going deep into the Gobi desert to the west, and swimming in the densely networked Jiangnan to the east.

I have stood guard on the plateau, fished in the mud, from south to north, from east to west, the Type 56 semi-automatic rifle has been with the Chinese army for nearly 30 years, and has almost never been unable to fire due to machine failure.

It is the most reliable partner of generations of Chinese soldiers, and its reliability is simply outstanding!

Because of this, Bai Yi's use of the bolt assembly of the Type 56 semi-automatic rifle can be said to be the best choice that is mature and reliable. However, Bai Yi did not copy the Type 56 semi-automatic rifle. The reason is that he chose the bolt assembly of the Type 56.

It's very simple. After all, the 56 semi is just a semi-automatic rifle.

Therefore, Simonov, the designer of the original Soviet SKS semi-automatic rifle, did not leave any room for modification when developing this gun. He just designed it as a pure semi-automatic rifle. Because of this, the Type 56 semi-automatic rifle

Although the rifle is good in all aspects, it is not suitable for improvement into a fully automatic rifle.

The same goes for the bolt component. Because it is semi-automatic and does not involve the issue of continuous movement of the recoil, the support point of the 56 and a half bolt is located at the front of the firearm. However, the firearm developed by Boyi is a fully automatic firearm that can fire continuously.

, if the support point of the bolt is at the front end, it may not be able to withstand the impact of continuous shooting, resulting in damage to the bolt and the entire gun being scrapped.

So Bai Yi took over another classic bolt-offset automatic rifle, the fal automatic rifle developed and produced in Belgium, and fully absorbed the structure of the bolt support point that moved backward. At the same time, he moved the receiver

Redesign, and then simplifying the production process of each link, formed the final solution for today's notebook.

"Well... before I joined the Soviet army, I studied in the Soviet Union for a period of time and worked as an intern in a factory for three months. During this period, I was exposed to a lot of firearms developed by the Soviet Union and absorbed a lot of useful nutrients.

…”

Naturally, Bai Yi couldn't say anything about firearms that would become commonplace only a few years later. But facing the admiring and envious eyes of Wang Dehua and others, Bai Yi also needed some explanations, and he was already familiar with this, and he said it even more shamelessly.

The people present had no doubts about Bai Yi, and it was no secret that Bai Yi returned from the Soviet Union. Therefore, Bai Yi's words were quickly accepted and recognized by everyone.

In this way, everyone gathered together to discuss the details and then dispersed. In the next three months, Bai Yi and others almost spent time in the No. 5 workshop, repeatedly scrutinizing every detail of the new firearms.

, Simplify what can be simplified as much as possible, and never use complicated production methods if it can be made with simple processes.

At this point, Bai Yi, a time traveler, does not have as many solutions as the old technicians with rich production experience around him. For example, in the production of small parts such as air guide hoops and ruler seats, Bai Yi only knows how to use machining. However,

Due to factors such as the proficiency of workers and the large accuracy errors of existing machine tools, the scrap rate of these small parts is very high.

Bai Yi thought of many ways to do this, but he could not reduce the cost of products. This problem was later solved by the old fitter Master Lei, and the method he used seemed very "unfashionable", because China had a long history in the pre-Qin period.

This process has been widely used. Over thousands of years, this process has been improved and spread to the present, which is the lost wax casting method.

Lost wax has been used in the manufacture of precision instruments since the pre-Qin period. There are several national treasure-level bronzes in the tomb of Marquis Yi of Zeng that were mapped in the late 1970s. They were cast using this lost wax process. Therefore, this set

During the inheritance of more than a thousand years in China, the craftsmanship has been improved by skilled craftsmen of successive generations, and now it has become an extremely mature precision casting technology.

It's just that this process was only used for the manufacture of complex and exquisite handicrafts in the feudal era, but now it has been introduced by Master Lei into the production of weapons and equipment. The process is also very simple, and the effect is even more obvious, using the lost wax casting method.

By casting precision parts, even if the resulting parts cannot meet the requirements temporarily, they can be used normally after simple machining.

The process is simple and the application is mature, and the older generation of craftsmen can operate it skillfully. The slight machining process also greatly simplifies the process. More importantly, the scrap rate is controlled within a very small range. Because of this,

Bai Yi simply removed the receiver

Although the lifespan of this lost-wax casting method may not be as long as that of machining, its production cost is low, production efficiency is fast, and more importantly, the scrap rate is extremely low, which is very important for China, which is short of resources and materials.
Chapter completed!