What are the requirements for material selection of overhead cranes cast?
In terms of overhead crane casting process, in terms of overhead crane casting equipment procedures, there are alloy melting machine pouring, modeling and core making, cleaning and post-processing, inspection, environmental protection and labor hygiene; in terms of casting methods, there are pressure casting, investment casting, Investment casting, metal casting, low pressure casting, ceramic casting, centrifugal casting, solid casting. Magnetic casting, continuous casting, vacuum suction casting, squeeze casting and graphite casting.
When designing castings, in addition to meeting the working performance of the parts, the casting process, alloy casting properties, casting methods, machining, assembly and transportation requirements should also be considered. The sources of raw materials used in casting are very extensive, and the cost of production is also very low, so combined with the above-mentioned, the casting process is widely used.
From the above, it can be seen that casting is very common in life, not only for metal casting. In a long time ago, casting was a folk art that could cast things that people wanted to use, such as porcelain. Manufacturing is widely used in the private sector, and manufacturing is also a casting method. But in today's society, the scope of the casting method has changed, and it is more suitable for the steel industry.
The casting overhead crane is more suitable for special equipment in China. The casting of the crane has certain operating procedures. The main trolley lifts the bucket, and the auxiliary trolley performs auxiliary work such as turning the bucket. In order to expand the scope of use of the auxiliary hook and better serve the steelmaking process services, the main and auxiliary hooks are respectively arranged on the main and auxiliary trolleys with independent trolley operating mechanisms, and run along their respective tracks.
Commonly used structural forms are double-beam double-track, four-beam four-track, and four-beam six-track.
The double-beam double-track overhead crane and four-beam four-track forms overhead crane are generally used for medium and large tonnage casting cranes, and the four-beam six-track double trolley form is generally used for extra-large tonnage casting cranes. During casting, different functions can be carried out according to the different requirements of customers. The following provides the following refer to:
1. The speed of each mechanism can be adjusted (1:10 or greater);
2. The spreader can be rotated;
3. The hook distance of the gantry hook is variable;
4. Overload limit and alarm;
5. Load weighing and display, PLC control and fault detection, display, recording and printing systems;
6. Prevent collisions between cranes with the same span.
This is the method of casting cranes, and it also introduces the widespread use of casting in today's society. Casting cranes are one of the main equipment in the continuous casting process of steelmaking. It is mainly used for mixing molten iron in the converter charging span to the converter, hoisting the molten steel to the refining furnace in the refining span, or hoisting the molten steel in the molten steel span to the continuous casting turntable. This technology hopes to be passed down all the time, and the technology will be continuously updated.
Then, in the face of the continuous development and improvement of overhead cranes, the types of materials made by cranes are also quite rich. However, the metal structure of the crane is still inseparable from the main material steel, but the materials of the various parts on the crane are also somewhat different, such as:
1. The material of the reel is generally gray cast iron with a strength not lower than HT200.
2. The steel wire rope is composed of steel wire and rope core. The steel wire requires high strength and toughness, and is usually made of high-quality carbon steel with a carbon content of 0.5% to 0.8%.
3. The material of the coupling gear is generally 45 steel or ZG55ll.
4. The material of the gears is generally made of medium carbon steel after quenching and tempering treatment or high frequency quenching treatment.
5. Q235B, Q235C and Q235D are specified for the main bearing members of the heavy machinery metal structure.
The requirements for such materials in overhead cranes are also closely related to the quality of the cranes they manufacture. Cranes made of high-demand materials can also ensure the safety and stability of their re-operation. Compared with large-scale machinery, in the manufacturing process. There are certain rules and regulations and safety audit requirements. Generally, individuals or enterprises are not allowed to illegally manufacture cranes at will. Even if you have mastered certain technologies, you must pass the national audit before you can manufacture commercial cranes. From this it appears that demanding conditions for some materials are required.
Because the accident of a crane can cause considerable damage, the manufacturing process of this large-scale machine is also very rigorous.
If you have any technical questions about overhead cranes and gantry cranes, please contact us freely, we will give you the most professional answers.