In poor quality agricultural machinery accessories, the materials used are more than 35% less than good. The most common alternative materials are plain grey cast iron (hereinafter referred to as gray iron) and ordinary low-carbon steel (hereinafter referred to as low-carbon steel). The materials that are often replaced are high-quality cast iron (such as ductile iron, hereinafter referred to as ductile iron), cast iron, high-quality steel, alloy steel, and powder metallurgy materials. Examples of copper and aluminum materials have also been replaced. The authenticity of the accessory material can be identified by referring to the following methods: Look at the gray surface of the cutting surface: gray, shiny, dark surface, rough surface; ductile iron: gray, shiny gray iron than gray, rough surface like gray iron; steel: a brighter gloss (but cast steel slightly Dark), fine structure, grinding or reaming surface as a mirror, delicate and smooth hand feel, chrome steel grinding surface common small bright spots; iron-based powder gold: silver gray, fine organization, its luster Between steel and iron. In addition, rubbing the smooth cutting surface by hand, the gray iron causes the hand to be dyed dark gray and is not easily wiped off. Ductile iron can also make hands black, but lighter than gray iron, while steel does not stain hands (except dust). 2. The boring test boring test is conducted after the purchase is determined and the supplier agrees to assume the responsibility. Select the non-matching surface with a regular boring tool. Because of the different materials, various metal materials react differently when being boring. Gray iron: boring cutting resistance is relatively small, when the boring, issued a "click" sound, very little sticky, swarf is grayish black, there are a small amount of silver and white highlights, look at the particle size is different, mainly small particles, Grinding with your fingers makes it easy to stain your fingers. Ductile iron: When boring, the resistance is slightly greater than that of gray iron. There are also obvious “squeaking†sounds, and little stickiness. The crumbs are grayish black and fine. Highlights, particle size varies, but mainly large particles, using fingers to grind debris, fingers can be dyed black, but lighter than gray iron dyeing; white iron: boring when issued a loud "grilling" sound No crumbs, no swarf, but only light, no scars, scratches can be seen on the surface of the boring knife; steel: most of the steel parts are cold or heat treated, the surface is hard, and when they are on the stern, they also whisper. However, the sound is much lighter when the white iron is being troweled, and the surface is brighter. After the boring, the scar surface is left with obvious scars. Copper: The most obvious feature of the boring is that the trowel is easy to skid, and the crumbs are easily sticky. The surface of the bedding is bright copper yellow or copper red; aluminum: it is very easy to boring, more crumbs and faster, gray or white White, sticky and heavy and difficult to brush off; iron-based powder metallurgy: less boring resistance, feel with low-carbon steel, sound like gray iron, non-stick smash, crumb particles similar to ductile iron, color black and stained , But slightly lighter than the ball iron.. 3. Listen to the percussion sound to suspend the accessories, hit it with a hammer or
Other metal object, the percussion force should not be too large, and close to the ear with the ear to listen, their sound is Different gray iron: low voice, very short duration, ductile iron: sound crisp, with reverberation, short duration, steel: voice is clear, sound like thin ring tones, longer duration.(Huang Li)
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