How to Choose High Quality Harvester Spare Parts?

“Why does a product have two prices?”
“Can you give me only one lowest price?”
“I don’t know the materials and processes in the remarks column very well, what should I do?”
For a long time, customers will have questions about our quotation, Why how big is the price difference between a factory’s quotation for the same spare part? Or, why are the prices quoted by the two manufacturers different for the same product?

The correlation between product price and product quality

Ordinary casting

For such questions, although we will attach a separate note to the items that are different from ordinary parts when quoting, customers usually only care about the price and ignore the reason for the price difference.

In this regard, we cannot just focus on the price, because the large price gap is generally the difference in the material and process of the product. There is an old saying in China, “You get what you get for every penny”. Only by understanding the information behind the price can we judge the quality of the harvester spare parts and choose the most suitable one for us.

For example, the rollers in the harvester spare parts generally have two different processes: ordinary casting and forging, and their quality is also very different. What about the quality of harvester spare parts judged by materials and production processes?

Ordinary casting

Influence of Different Processes on the Quality of Harvester Parts

Casting is mainly by pouring molten liquid metal into the model to fill it up, and after it cools and solidifies, the blank or part casting can be obtained. This method is suitable for mass production of harvester spare parts Harvester spare parts are generally cheap, but the quality is not stable.

Forging

Due to the many manufacturing processes and complex influencing factors, many defects are prone to occur, and the mechanical properties are not as good as forgings. For example, the driving wheel in the picture above has obvious pores on the surface, and the finished product It is not particularly flat and so on. Harvester spare parts made by this type of casting method have this phenomenon.

Forging

Forgings are forging machines that apply pressure to metal blanks at high temperatures to deform the metal to obtain castings with certain shape, size and mechanical properties. The finished product produced by forging has a denser structure and molecules, can withstand greater pressure during application, and is lighter than casting. This is because forging can make the metal more compact during the smelting process, and while optimizing the microstructure, it can also preserve the complete metal streamline.

Forging

Therefore, the forgings in our common harvester spare parts are usually precise in size and more appearance. In order to be flat, there are few defects. More importantly, the mechanical properties of forgings are generally better than those of castings of the same material. For example, the forged rollers in the picture have a smoother and more beautiful surface than castings.

Forging

Influence of different materials on the quality of harvester spare parts

In addition to the distinction in terms of craftsmanship, we also need to understand the difference between materials. Because the material is different, it will also greatly affect the quality of the harvester spare parts.

Ductile Iron

The materials commonly used for castings are gray cast iron, ductile iron, malleable cast iron, cast steel, cast road alloy, cast brass and others. Among them, ductile iron and gray cast iron and some stainless steel materials are widely used in harvester spare parts.

Quenching

Ductile iron has good technological properties and mechanical properties, which can be further adjusted by a series of heat treatments such as normalizing (increasing strength and wear resistance), annealing (relieving internal stress), and quenching (tempering to obtain good comprehensive mechanical properties). . Therefore, it can be used to produce parts with complex force, high wear resistance, strength, hardness and toughness, and can replace carbon cast steel and malleable cast iron to a certain extent, as shown in the quenched drive wheel.

cast iron

Gray cast iron has good casting performance and cutting performance, high wear resistance, strong shock absorption and low notch sensitivity, and the spare parts of this material are generally cheap, and are generally used to manufacture complex shapes under large loads. Box (castings need decompression annealing to reduce the internal stress of castings), machine tool guide rails and cylinder blocks (castings need to be surface quenched to increase the quenching hardness to improve the hardness and wear resistance of the casting surface. As shown in the figure, the surface of gray cast iron generally looks It will be very flat and firm.

harvester spare parts

Other material. Chilled alloy cast iron, vermicular graphite cast iron, stainless steel and other cast iron materials, as shown in the figure, is common stainless steel spare part in harvester spare parts.

Forging parts

Forging parts are generally made of 35SiMn or 16MnCr material, commonly used in heat treatment quenching, water cooling, tempering, oil cooling and other processes. The harvester parts produced have high strength, wear resistance and fatigue resistance, good toughness, and quenching. Good permeability, generally used for various small and medium shafts and gears.

Forging parts

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