Chapter 218 (2/2)

At present, there are only two kinds of metal processing capabilities available in gaoshu tribe, namely, the most primitive sand casting and hammer forging. Other hot processing technologies such as injection casting, die casting, rotary casting and directional solidification are not available at all, let alone cold processing technologies such as cold rolling, cold drawing, cold forging, stamping and cold extrusion.

As for precision casting, it only exists on paper.

You expect to use sand casting to produce precision metal parts that can only be produced by precision casting. That's just a joke. If you want to use a hammer to forge precision parts, it's better to use sand casting

However, under the guidance of stone bear and Ferguson, Jack is now preparing to try the lost wax method. What's more, the lost wax method is a metal hot working process with the highest cleanliness under the current conditions.

I know this kind of thing is urgent. Just like in previous generations, the metal processing technology has been improved for hundreds of years, but the machining accuracy is still limited. This is the most basic thing. You can't be anxious if you want to. You can only do it step by step.

However, stone bear also knows that he has golden fingers, and this process will be greatly shortened, but he can't be in a hurry.

It's like the bearing in hand belongs to the type of bearing with a stop on the outer ring. The casting of the inner ring and outer ring is OK. At least the two rings look very round.

But the rolling element inside, that is, the 15 cylindrical rollers, is really a bit ugly.

Bearing is a kind of support body to support the rotation of machinery. Whether it is high-speed rotation or low-speed rotation, the friction coefficient and rotation accuracy are strictly required. The smaller the friction coefficient and the higher the rotation accuracy, the better the bearing.

But whether it is the friction coefficient or the rotary accuracy, it depends on the machining accuracy of the whole bearing, especially the rolling element.

But Jack made the cylindrical roller of this bearing, the machining accuracy error is really visible to the naked eye. It is no exaggeration to say that this kind of cylindrical roller is like later generations cutting a steel bar into several sections and then inserting it between the inner ring and outer ring of the bearing.

The stone bear could only shake his head helplessly and said, ”Jack, try to cast this kind of cylindrical roller with the lost wax method.”

Although the lost wax method was mostly used to cast bronzes in ancient China, it is undeniable that the casting accuracy of lost wax method is much higher than that of sand mold casting.

Even when Ferguson cast the barrel of a new rifle, he used the lost wax method.

”Well, pay attention to communicate with Ferguson. He has a deep understanding of the foundry technology in this area.”

Jack nodded his head quickly to show that he knew

PS: bow to thank ”the first kiss to the hand” 2000 reward!