Integral casting digging bucket and manufacturing method thereof

Abstract

The invention belongs to the field of engineering machinery, and particularly relates to an integral casting digging bucket and a manufacturing method thereof. The integral casting digging bucket comprises a lifting lug, a top plate, two side plates and a bottom plate connected with the two side plates, and the lifting lug, the top plate, the two side plates and the bottom plate are integrated. Cast steel for casting the digging bucket comprises the following components: 0.1%-0.6% of C, 0.2%-0.6% of Si, 0.5%-1.8% of Mn, 0.5%-1.6% of Cr, 0.2%-0.75% of Ni, 0.1%-0.6% of Mo, less than or equal to 0.035% of P, less than or equal to 0.035% of S, and the balance of iron. The method for manufacturing the integral digging bucket of an excavator by using the cast steel comprises the following steps: smelting the components of the cast steel in a smelting furnace; and after smelting is finished, carrying out modification treatment in front of a furnace, manufacturing models and mould plates, coating, heating, vacuumizing, placing a sandbox, adding sand, modeling, carrying out mould assembling, pouring, quenching, and tempering and cooling to the normal temperature to finish casting of the digging bucket. A vacuum sealing technology and a low alloy steel material are adopted, the integral casting digging bucket is formed by one-time pouring, and the product is high in strength, high in wear resistance, corrosion resistance and impact force resistance and long in service life.

Description

Technical field [0001] The invention belongs to the field of engineering machinery, and particularly relates to an integral casting bucket and a manufacturing method thereof. Background technique [0002] Excavator buckets are generally made of cast iron. After a period of use, the wear of cast iron materials is more serious. When they are worn out to protect them, they need to be replaced. If you use higher hardness and high content alloy steel When making buckets, although this kind of higher hardness alloy steel material has better wear resistance, its comprehensive mechanical properties are poor. The higher hardness causes its brittleness and is extremely easy to break when used. In addition, the existing excavator buckets are almost all assembled by welding technology, cannot be heat-treated, are not wear-resistant, and the welds are easily broken and have a short service life. [0003] Rare earth elements are usually used to improve the wear resistance of steel, which has a ...

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Problems solved by technology

[0005] The water-based quenching agent is characterized by a high cooling rate throughout the cooling process. In the high-temperature cooling stage, it can promote grain refinement and regular crystal shape, which is conducive to improving the performance of the workpiece. However, in the low-temperature stage, too high cooling rate is easy to Lead to problems such as cracking of the workpiece, quenching deformation, and soft spots; in addition, water-based quenching agents generally have problems such as insufficient anti-rust performance and insufficient cleaning ability, and are prone to oxide scales, and the amount of quenched workpieces is large, which greatly affects the processing technology and Productivity

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