mechanical engineering and metallurgical industry

Often when they talk aboutmechanical engineering and metallurgical industry, immediately present giant blast furnaces and CNC workshops. But this is just the tip of the iceberg. In fact, this connection is much thinner and more capricious. Many people, especially from the outside, think: once the metal is cast, it’s sent for processing. And then it’s a matter of technology. In practice, it depends on the quality and specificity of the metal, on its “behavior?” During processing, everything depends - from the service life of the finished machine to the economics of the entire project. It’s about these nuances that are glimpsed in textbooks, but in the workshop decide everything, and I want to speculate.

Where theory diverges from practice: raw materials and their surprises

Take, for example, the production of mining equipment. The task seems to be standard: we need steel with high tensile strength and impact toughness. There are technical specifications, GOSTs are prescribed. We order from metallurgists. But this is where the fun begins. A batch of metal may formally meet all standards, but behave during machining...unpredictably. It happened that when milling large-sized parts, say, crusher bodies, internal stresses in the metal remaining after casting and rolling led to deformations of the almost finished part. Microcracks that are not visible during ultrasonic testing of the ingot can appear only after heat treatment of the finished assembly.

This is not the fault of metallurgists, this is a problem at the junction of two complex industries. The metallurgist thinks about the chemical composition, macrostructure, and rolling properties. Mechanical engineer - about micron accuracy, about surface roughness, about assembly behavior. And their dialogue often comes down to complaints, although they need to speak the same language - the language of final loads and operating conditions. For example, for critical components, we have long switched to the practice of testing trial batches jointly with the metal supplier. Not just look at the certificate, but remember it yourself. material on its own technological chain.

One of the most striking cases was related to the production of drums for magnetic separators. A special structural steel was needed, non-magnetic, but at the same time wear-resistant. Standard grades were not suitable - they either corroded in the aggressive environment of the processing plant, or their hardness made welding difficult. I literally had to sit down with the technologists of the metallurgical plant and develop an almost one-piece alloy. It’s time-consuming and expensive, but this is the only way to achieve a resource that eventually pays off all the costs. There was simply no ready-made solution on the market.

Equipment as a system: why you can’t just assemble a unit

In our business, especially in mining engineering, it is rare that a product is just a machine. This is almost always a complex system, where the mechanical part is closely connected with hydraulics, electrical, and control systems. And heremechanical engineering and metallurgical industryconverge again, but at the level of materials for special components. Let's say the same magnetic separator. His heart is a magnetic system. You can buy standard ferrite magnets and assemble them. But the efficiency will be... average.

Therefore, companies that are seriously involved in the topic are forced to dive into related areas. Here you goLONGI Corporation (https://www.ljmagnet.ru). They started with the development and production of mining equipment, and became, in fact, experts in the field of electromagnetic technology. Because they understood: in order to make an effective separator or enrichment machine, you need to control the entire cycle, including the production of key intangible components - magnetic fields of a certain configuration and strength.

Their experience is indicative: an enterprise in Fushun with an area of ​​140,000 m2 and a team of over 1,200 people, where more than 60% are engineers and technologists with higher education. This is not just an assembly plant. This is a complex where metal is processed for housings, complex electromagnetic coils are wound, and control systems are programmed. The annual volume of 4,000 units of equipment is a scale that allows us to develop technologies not in the laboratory, but in real production cycles. But the main thing is synergy. Their mechanical engineers work in conjunction with physicists and metallurgists. Because the separator body (mechanical engineering) must not only be durable, but also have a minimal effect on the magnetic field (physics), and the materials for its manufacture must not be magnetized (metallurgy).

The cost of failure: when failure teaches more than success

I’ll tell you about one of our old projects, about ten years ago. We were making a large jaw crusher for one of the Siberian processing plants. The calculations were flawless, the metal for the main load-bearing elements (frame, flywheel) was taken to the maximum - high-alloy, expensive steel. We assembled it, tested it on the bench - it works perfectly. Shipped. Three months later - a call: a crack in the frame. The reason, as it turned out after analysis, was not the load, but… the temperature. In winter, -50°C is common in that region. And our super-strong steel turned out to have low cold resistance. The impact and extreme cold caused brittle fractures in it.

Metallurgists, of course, gave a certificate that also indicated impact strength at -40°C. But real conditions turned out to be harsher. It was a classic failure at the intersection of disciplines. We, as mechanical engineers, have focused on strength under normal conditions and dynamic loads, but have underestimated the climatic factor as part of the “metallurgical” factor. behavior of the material. After this incident, we began to include in the technical specifications not just “climatic specifications,” but detailed requirements for the properties of the metal in a specific range of operating and non-operating temperatures, with a margin. And demand from suppliers not just standard tests, but tests modeled for our specific case.

This lesson was costly, but it changed our thinking. Now any new development begins not with a 3D model, but with a table of material properties in conditions as close as possible to the future “place of work” cars. Including humidity, environmental aggressiveness, temperature changes, cyclical loads. Without this dialogue with metallurgists at such a deep level, it is simply impossible.

Trends and dead ends: where are a bunch of industries heading?

Nowadays there is a lot of talk about digitalization and “Industry 4.0”. In the context of our topic, it looks like this: smart sensors built directly into the casting or forging that monitor metal fatigue in real time. Or predictive analytics systems that, based on data from processing on CNC machines, can predict the behavior of the next batch of metal. It sounds great, but in practice... So far these are more often targeted pilot projects. The bulk of problems are solved using old, proven methods: microscope, tensile testing, Brinell hardness testing.

A more real and pressing trend is the customization of materials. As in the example withLONGI Corporation. Universal steels and alloys are gradually giving way to “sharpened” materials. for a specific part in a specific car. This requires incredibly close cooperation. The machine-building plant must clearly formulate: here we need wear resistance, here we need elasticity, here we need absolute non-magneticity. And metallurgical production must have the flexibility to cook such mini-batches economically.

Another point is ecology and resource conservation. Requirements are becoming more stringent, and this is changing both industries. In metallurgy, this is a transition to technologies that reduce emissions (for example, electric arc furnaces). In mechanical engineering, this is a request for light and durable alloys (titanium, aluminum composites), which can reduce the weight of equipment, and therefore the energy consumption for its operation. But titanium is difficult to process, it is “sticky” and requires special tools. Again a challenge at the junction. It is necessary not only to select new cutting plates, but also to completely revise the cutting and cooling modes.

Instead of a conclusion: thinking out loud

So, to summarize the scattered thoughts...Mechanical engineering and metallurgical industry- these are not two neighboring industries in an economics textbook. This is a single technological loop with feedback. The success or failure of the final product is not determined in the assembly shop, but much earlier - when choosing a steel grade, when developing a casting mode, when planning the heat treatment of a forging.

Experienced teams, like the one that formed inLONGIover the years of work since 1993, they understand this. Their strength is not that they make a lot of equipment (4000 units per year is a serious number). Their strength lies in the fact that they have built this very connection within themselves. From control over the properties of raw materials (metal for housings, materials for electromagnets) to final assembly and testing of the most complex enrichment complexes. This is the very “practice” that turns simple production into an engineering art. Without this, it’s just assembling a construction set from someone else’s parts. And with this comes the creation of working systems, where each piece of hardware carries the memory of a blast furnace, a CNC machine, and the engineer who brought them together in the terms of reference.

So the next time you hear these two words together, think not of two giants, but of a thousand small but critical transitions between them. This is where quality is born. Or, alas, a defect is discovered.