Now Li Zhao mainly has two things to draw, the first is the electroslag remelting furnace, the second is the transformation of the machine tool of the rolling mill, and the other is not particularly anxious to do anything for him, in fact, at this time, Director Yang is already afraid that Li Zhao will throw out something shocking.

Regarding the design of the electroslag remelting furnace, the three tons taken out in front of the military factory felt that it was too small, and Li Zhao intended to build a ten-ton one, no matter how big it was, the power supply would really become a big problem. These projects are estimated to be inseparable, but there are many factors that need to be considered in the design of such an electroslag remelting furnace, and it is not a simple scale-up. You must know that Li Zhaoke learned from the Ministry of Machinery that there are now three factories that have produced half a ton of equipment.

But half-ton equipment and ten-ton equipment are completely two concepts, and the difficulty of implementing half-ton is too small. Not to mention anything else, just talking about power, it is only a few hundred kilowatts, and any transformer with a similar can be driven, as long as the line is almost usable, and there is no need to consider so many safety issues.

And to reach ten tons, it is a completely different concept, the power alone makes Li Zhao feel a headache, if the melting time is set to half an hour, then basically the power will be eight or nine thousand kilowatts, and the design, at least 20 percent of the margin, so calculated, the power will directly exceed 10,000 kilowatts. In order to be safe, it is necessary to adopt a low-voltage, high-current design, so the transformer basically needs to be installed next to the electroslag furnace, which has to consider the problems of transformer safety, ventilation, cooling, dust, etc.

It is different from the three-ton one, the three-ton one is small after all, and many of them can make do, but the design of the ten-ton one may need to consider the plant, operation mode, etc., in short, the design is a headache for Li Zhao.

Li Zhao will first design the furnace body, and then when the project is determined, he will discuss the way to achieve it with the corresponding departments, especially in terms of power supply, which is tens of thousands of kilowatts of power, which is not small. Li Zhao inquired about the power station next to it, and the total installed capacity of others is only more than 100,000 kilowatts, and his own furnace will account for one-tenth, in addition, the transformer is also troublesome, our common transformers may only be a few hundred kilowatts, and tens of thousands of kilowatts is another concept.

The other is the transformation of machine tools, which is relatively good, these machine tools have drawings, some of which are brought by the original factory, and some of which are surveyed and mapped, needless to say, these must be prepared by the Ministry of Machinery to imitate and survey.

However, this also brings great convenience to Li Zhao, otherwise let himself go to surveying and mapping one by one, it can also annoy him, after all, these old antiques used now, Li Zhao has not been in contact with them at all, if there are no drawings, then he can only survey and map by himself, in that case, just surveying and mapping is enough for Li Zhao to be busy for a few years, don't think it is an exaggeration, when surveying and mapping, the special equipment is involved in the inside of the body, which is very troublesome.

If Li Zhao wants to transform the machine tool, he needs to redesign some parts according to these drawings, replace the corresponding parts, and then correct them according to the actual use. For example, the machine tools made by John Bull now, they use their own standards to manufacture, and many times you will find that if you change to a common international standard, it is not an integer in many cases. It's not a question of one or two accessories, it's a whole thing.

Li Zhao wants these equipment to use international standards, so he needs to make trade-offs to modify some parts. Some are simpler, such as lathes, lathes are the rotation of the workpiece, and the turning tool controls the feed through the screw to complete the turning process, and he only needs to transform the small piece of the feed to solve the problem.

But some are more complicated, such as milling machines, the workpiece of the milling machine is fixed, and the cutter is rotating, although the feed is also a tool, but the transformation is definitely more troublesome than the lathe. For example, a gantry-type milling machine, the motor of the cutter head can not only move up and down with the screw rod, but also can move along the gantry beam left and right, and the gantry can also move forward and backward along the worktable, which is equivalent to moving in six directions, so the feed in these directions needs to be transformed.

If you need to replace the screw, it will be more troublesome, and it is not easy to make a precision screw rod of two or 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 accuracy of the screw involves whether the amount of feed is what you need.

Of course, if the machine tools are the same type, it is not a big problem, the key is that there are too many types of machines in the rolling mill, the age is too much, and the basic needs to be designed according to the situation of each machine tool, otherwise it is likely that the parts do not match, resulting in machine damage. For a simple example, such as gears, if you design the teeth and the original gear, the angle is a little mismatched, then it is possible to directly pay for the gear, you must know that these equipment can span more than 40 years, several countries, and each country is not produced by the same manufacturer, the gear they use may be about the same size, but the different teeth may be very large, you can imagine how many problems there will be.

Now Li Zhao is starting to transform a lathe, this one is the worst situation in the factory, it is estimated that the leader is afraid that Li Zhao will miss, first find this one is not afraid of failure, it is a big deal to scrap, for this equipment, no one in the factory is distressed. There are a lot of problems with this lathe, Li Zhao has seen the drawings, it is the equipment of the Da Mao family more than 40 years ago, and it adopts the standard of John Bull, which needs to be changed to an international standard.

The second is that the design accuracy of this lathe is extremely low, and it can only be used for rough turning, and the minimum feed scale of this lathe is 64th of an inch, which is about 0.4 millimeters, or 40 filaments, when converted to international standards. This accuracy is a relatively large value in machining, but it is the minimum operating scale of this equipment, and it is basically useless except for rough turning.

Not to mention the spare parts, the accuracy of the accessories is also a mess, which also leads to a relatively large assembly clearance, and the maximum speed of the spindle is relatively slow, only a thousand revolutions per minute, but at such a speed, his noise and vibration are very large. The same is true for motors, because the processing of the motor shell is also a bit of a problem, the shafts of the motor are a little eccentric, and this should also be changed. There is not much problem with the levelness of the spindle, etc., and it is estimated that it has been adjusted, which directly affects the processing, and it is estimated that it has been changed.

After getting the requirements for the transformation of this equipment, Li Zhao also worked with Mr. An to measure it, and finally gave the standard of ten wires for the processing accuracy after the transformation, and the maximum speed of the spindle was changed to 2,000 revolutions per minute. In this way, the transformation is still a bit possible, if it reaches a few wires or even lower, Li Zhao can only sweep this equipment into the garbage heap, because it is not as simple as building a new one.

In the end, Li Zhao needed to replace more than 30 parts, basically the gears were all replaced, the motor shell was recast, the screw rod, and all the parts related to the feed were redone, and all the drawings of these have been drawn, and they have been issued, and it is estimated that the accuracy of the design is not too high, but Li Zhao estimates that in the end, all the equipment will be improved, and the performance of most of the lathes in the factory will be similar, and it may even be better.

The reason is very simple, because this equipment is heavy enough, because the accuracy of this equipment is very poor in terms of design and processing, resulting in the bed and bed base materials of this equipment are very solid, which is heavier than two. Of course, this is also the consistent style of Da Maojia equipment, loud noise, big vibration, it doesn't matter, it's no problem to directly aggravate the equipment.

In this way, as long as Li Zhao's transformation will be the assembly accuracy, then it is easy to reduce the vibration, and after the vibration is lowered, the machine tool will be more stable because of the solid materials, which is probably an unexpected joy.

Thinking of this, Li Zhao didn't want to stay in the office, so he got up and went to the electrical workshop first, the motor shell was cast here, Li Zhao wanted to see if the motor shell was done, and then went to the fitter workshop to see the production of accessories, if it was all right, you could start assembly.

I came to the electrical appliance first, and got a satisfactory answer after asking. Li Zhao also picked up the measuring tool to measure the motor shell, and the result was very satisfied, and the problem of eccentricity of the motor spindle was basically solved.

Then go to the fitter workshop, the rest of the parts are produced in the fitter workshop, a question, only to know that there is no completion of the screw rod now, Li Zhao knows, this screw is really a little difficult to process now, because Li Zhao requires relatively high precision, is now being polished by two eighth-level workers by hand. Of course, one of them was an uncle, and Li Zhao also walked over to see the actual situation.