Siheyuan starts from a good life

The weather on the second day was good, the wind was sunny, the sky was clear, and there was no dust. It was really good.

The climate of Sijiucheng is characterized by four distinct seasons. Spring is dry, summer is hot and rainy, autumn is refreshing, and winter is cold and dry. The wind direction has obvious seasonal changes, with northwest wind prevailing in winter and southeast wind prevailing in summer.

However, due to the serious damage to vegetation in Inner Mongolia in the past, windy times were often accompanied by wind and sand. There was no Sanbei Shelter Forest in these years. I can eat a mouthful of sand when I have time.

Not long after arriving in the office, Zhang Huifei, the chief of the technology department, came to Jiang Yan's office with a lot of drawings in his arms.

Entering Jiang Yan's office, Zhang Huifei put down the drawings in his hand and said to Jiang Yan after seeing Jiang Yan: "Mr. Jiang, these are all the drawings of the machine tools in our research institute workshop."

Jiang Yan looked at the drawings on the table and said nothing as quickly as I did. He stared at Zhang Huifei, waiting for his next words.

Seeing Jiang Yan looking at him, he laughed a little awkwardly, and then said: "Didn't you preside over the upgrading and transformation of machine tools in the steel rolling mill next door? We were wondering if the machine tools in our research institute could also be upgraded. Fan."

"We are not going to produce CNC machine tools right away. We want to practice with these things first."

Jiang Yan nodded and casually picked up the drawings of the machine tool he had brought over and started looking at them.

Jiang Yan found that some of these machine tool drawings were brought by the original factory, and some were from surveying and mapping. From these machine tool drawings, it can be seen that they did not just think of things in a flash of enthusiasm. It seems that they have been full for a long time.

"Mr. Jiang, there are some things we are not particularly sure about, and I want you to show us."

Jiang Yan nodded and upgraded the machine tools. Jiang Yan fully agreed. Many of the machine tools held by the institute were older than Jiang Yan, and only some of them were new machine tools.

Jiang Yan had thought about upgrading before, but he had been busy with other things recently. He was talking about those machine tools for surveying and mapping one by one, which would annoy him to death. After all, the ones he is using now Jiang Yan had never come into contact with some of these old antiques. If there were no drawings, then he would have to do the surveying and mapping by himself. In that case, just surveying and mapping would be enough to keep him busy.

With these drawings, Jiang Yan had a lot of energy left.

If you want to modify the machine tool, you need to redesign some parts based on these drawings, replace the corresponding parts, and then make corrections based on actual use.

However, what Jiang Yan is doing now must unify standards, because Jiang Yan knows that the machine tools in the entire institute come from different countries like the previous steel rolling mills, and the standards are also diverse.

For example, the machine tools manufactured by John Bull are also manufactured according to their own standards. Many times you will find that if you change to a common international standard, it is often not an integer. It's not a question of two accessories, it's a question of the whole thing.

If you want these equipment to use international standards, you need to make choices to modify some parts. Some are simpler, such as lathes. The lathe rotates the workpiece, and the turning tool controls the feed through the screw to complete the turning process. He only needs to modify the small part of the feed to solve the problem.

But some are more complicated, such as milling machines. The workpiece of a milling machine is fixed, but the tool rotates. Although it is also the tool that completes the feeding, the transformation is definitely more troublesome than that of a lathe. For example, in a gantry-type milling machine, the motor of the cutter head can not only move up and down along the screw rod, but also move left and right along the gantry beam, and the gantry can also move forward and backward along the workbench, which is equivalent to moving in six directions. If it can move, then the feed in these directions needs to be modified.

Modifying these also requires determining the accuracy of the screw. If the screw needs to be replaced, it will be even more troublesome. It is not easy to make a precision screw that is two to three meters or even longer. If you want to ensure the precision of the machine tool, you have to move these places. After all, the precision of the screw rod depends on whether the amount of feed you need.

Of course, if the machine tools are all of the same type, then it is not a big problem. The key is that there are too many types and ages of machines in the rolling mill. Basically, it is necessary to design according to the conditions of each machine tool. Otherwise, there is a high possibility of parts mismatch, resulting in machine failure. damage.

Take a simple example, such as gears. If the teeth and angles of the original gears do not match when you design them, then the gears may be wasted directly. You must know that these equipments span more than 40 years and are used in several countries. , and each country is not produced by the same manufacturer. The gears they use may be about the same size, but the teeth may be very different. You can imagine how many problems there will be.

At this time, Jiang Yan was looking at a drawing carefully, and from time to time he would make modifications on it with a pen.

The machine tool on the drawing is currently in the worst condition in the institute. This machine was manufactured by Mao Xiongjia more than 20 years ago. It adopts John Bull standards. The reason why I chose Maoxiongjia’s machine tool is not Because their machine tools are rough and durable, and the most important thing is that this machine tool is close to being scrapped, so you don't feel bad if it breaks when you come to practice with it.

However, there are many problems with this lathe. Jiang Yan has seen the drawings. The design accuracy of this lathe is extremely low and can only be used for rough turning. The minimum feed scale of this lathe is fifty-fourths of an inch. If converted to international standards, it is probably less than 0.4 millimeters, which is 40 wires. This accuracy is a relatively large value in machining, but it is the minimum operating scale of this equipment. It is basically useless except for rough machining.

Not to mention the spare parts, the accuracy of the parts is also a mess, which also results in relatively large assembly gaps, and a finger can be inserted into the largest part.

After testing, this spindle, which originally had 2,000 rpm, can now reach a maximum of 1,000 rpm.

The noise and vibration are quite large, which further affects the accuracy of the production parts.

Because the motor on this machine tool has not been properly maintained, the sound when turned on is almost as loud as that of a tractor. What is even more exaggerated is that the motor casing has been damaged to varying degrees. In some places, it is simply covered with iron sheets. The motor's The axes are all a little eccentric, and this needs to be corrected as well.

However, the levelness of the spindle was not a big problem. Jiang Yan asked Zhang Huifei, and he said that they had adjusted the machine, but the adjustment was still a bit unsatisfactory.

Although this machine tool has certain qualities, one thing that makes it outstanding is that the chassis is stable enough. It is precisely because this machine is heavy that the bed and base materials of this machine are very solid. , one is heavier than two. Of course, this is also the consistent style of Da Mao's equipment. No matter the noise or vibration, it doesn't matter. Just add weight to the equipment and there will be no problem.

In this way, as long as Jiang Yan's transformation improves the assembly accuracy, it will be easy to reduce the vibration. After the vibration is reduced, the machine tool will run more stably because of the solid materials used. This is probably an unexpected surprise. Bar.