My system is not decent

Chapter 733 A Discovery
Workers made [-] wooden models, and Chen Wenzhe was making clay models, because the casting of Jing Yunzhong needed clay models.

Clay models are not so easy to make, because they need finishing, drying and other processes.

The manufacture of clay models has a long history.

Judging from archaeological excavations, the Xia Dynasty was able to cast bronze.

The original cast was made of stone fan.

Because stone is not easy to process and not resistant to high temperature, stone fan was quickly replaced by mud fan.

In the early Shang Dynasty, marked by the Erlitou site in Yanshi, copper adzes and copper bells were cast with clay molds.

After Pan Geng moved to Yin, the bronze casting technology reached its peak.

In order to obtain bronze castings with complex shapes and beautiful patterns, smelting craftsmen choose pure sand with high refractoriness to refine clay molds.

This is the key point, only qualified sediment can produce qualified mud model.

This is not difficult for Chen Wenzhe, who has a master-level mud practice technique.

What is really rare is knowing what kind of sand to use.

Not to mention other things, ordinary sediment, after being mixed into mud, will crack after a little drying.

And the cracked mud fan, how do you use it?
If you want to avoid such a result, you need to look at inheritance.

In inheritance, there are too many successful experiences, so Chen Wenzhe will not take detours, he will always walk on the right path.

After choosing the sand, start to make the mud model. At this time, you also need to choose the craft.

In terms of modeling technology, clay mold casting takes the separate casting method as the basic technology, so as to cast complex utensils.

Or cast the body first, then fit the mold on it and pour the accessories;

Or cast the accessories first, and then cast the two into one when pouring the body.

During the Spring and Autumn Period, the process of casting the accessories first and then the body became the mainstream of the separate casting method.

At this time, the time to express technology has come.

The clay mold made by separate casting method has strict requirements on the drying, roasting, assembling and uniform wall thickness of the mold core.

Only by making a qualified clay mold, making it solidify at the same time when casting, and preheating the mold so that it can be poured smoothly, can a qualified product be cast.

In this regard, a complete set of mature craftsmanship has been explored during the Shang and Zhou dynasties.

In the Han Dynasty, the craftsmanship was naturally more mature, such as the three bronze wares placed not far away.

Chen Wenzhe got these three bronze wares not only because he likes to collect them, or because he wants to make money. What he values ​​most is the craftsmanship.

The casting technology of the Han Dynasty cannot be said to be stronger than that of the Xia, Shang and Zhou Dynasties, the Spring and Autumn Period and the Warring States Period, but it is definitely not weak.

For example, the stack casting method reached its peak in the Han Dynasty.

It can be said that another outstanding achievement of clay mold casting is the emergence and wide application of stack casting.

Stack casting is to stack and assemble many templates, or pairs of templates, and pour them from a common runner, so that dozens or even hundreds of castings can be obtained at one time.

The earliest stacked castings in my country are Qidao coins in the Warring States Period.

In the Han Dynasty, the overlapping casting method was widely used in the production of coins and chariots and horses.

During the Tang and Song Dynasties, the technology of casting large and extra-large castings with clay molds became more and more mature.

The iron lion from the Five Dynasties period in Cangzhou and the Yongle bell from the Dazhong Temple in the god capital are all world-renowned huge castings.

As for Jing Yunzhong, he was made by separate casting, not a super-large casting at one time!
Therefore, some things need to be done in advance.

And as long as it is done well, it may not be so troublesome to continue to make some big clocks in the future.

After all, it's the first time to do it, so let's follow the original method and explore it!

After all, Chen Wenzhe has never seen the Yongle Bell, so he doesn't know how the one-piece casting is done.

Making clay models and wooden models has been my work recently.

Of course, in this process, it is also essential to continuously smelt copper ore and refine copper ore.

The work progressed slowly and orderly. On this day, some small clay models made by Chen Wenzhe were ready for use.

And some bronze materials were fired successfully and put aside for later use.

At this time, Chen Wenzhe needed to experiment to see if the alloy materials he had prepared were suitable for making percussion instruments.

By the way, these days, Chen Wenzhe also transported the batch of Yueyu bronzes at home to Dahai City, because they will not go back to their hometown for the Chinese New Year this year.

One aspect is that the little niece is too young to travel by boat.

Another reason is that the two elderly people in the family are reluctant to part with the income from the restaurant.

The better the Chinese New Year, the better the restaurant's business. How could they give up the huge income that is easy to get in order to go home for the New Year?Absolutely impossible!
So, after a little discussion, they decided that the family would stay in Haihai City for the new year.

Anyway, the whole family is in Dahai City. Where can we celebrate the New Year? Can't the family reunite?

Among the batch of bronze wares was a chime bell and some copper bells, which Chen Wenzhe needed.

He still admires the technology of Yueyu Huang's family, but Chen Wenzhe really doesn't believe that everything made by Huang's family is fake.

Therefore, if you can't see the real chime, then learn from the imitation technology.

It was because of various preparations that Chen Wenzhe made some small clay models and prepared to do some experiments.

The simplest thing he made this time was chime bells, singing bowls and some wind chimes.

The craftsmanship of the bell is a little more complicated, similar to a big bell.

Moreover, one-piece casting is required. Chen Wenzhe feels that he has not fully mastered this craft, so he thought about making some simple things first.

Don't look at the chimes and singing bowls are bigger, but it's really not difficult to cast these things.

Once the clay model is ready, just pour copper water into it, wait for it to cool, trim and polish it.

Whether it can be poured in one piece depends on this moment.

The cooling speed is very fast. After breaking the clay fan and taking out the chime bells and singing bowls, there is no possibility of failure.

With modern machines, whether it is trimming or grinding, the speed is very fast.

The machine is fixed with sandpaper and rotates rapidly.

At this time, put the copperware in, and you can polish whichever side you want, without much trouble at all, and the polishing will be completed quickly.

After all the procedures are completed, it is time to verify the results.

Percussion instruments, good or bad, you can tell what's going on with just one tap.

The sound of "ding" is melodious, with lingering lingering sounds, which is very pleasant to hear.

But after hearing the sound of singing bowls made by others, Chen Wenzhe knew that it didn't sound very pleasant to him, did he?

It feels no different from the sound of those singing bowls I bought!

I rang the chime again, and the sound was that kind of sound. I am not a professional, and I don't seem to be able to judge whether it is good or bad.

At this moment, Chen Wenzhe felt a little numb!

Fortunately, Cao Qingchun prepared two kinds of singing bowls for him, one with a low voice and one with a crisp voice.

After such a comparison, Chen Wenzhe discovered something.

(End of this chapter)