Full of dry goods, Zhangqiu forgings common sense to share!
Zhangqiu forgings quality inspection items are as follows: geometric shape and size. Generally use steel ruler, caliper, sample plate and other gauges to detect the shape and size of forgings, with the scribing method can accurately detect the shape of complex die forgings, surface quality, forging surface such as cracks, crushing, folding defects, generally can be found with the naked eye, sometimes the crack is very small, if the depth of the fold is unknown, can be shoveled off after observation.
If necessary, you can check by flaw detection. Internal organization, the chapter of forgings whether there are cracks, inclusions, loose and other defects, chapter of forgings on the section of the macroscopic organization available to the naked eye or with 10 ~ 30 times the magnifying glass inspection. The common method of production is acid etching test, that is, from the forgings need to test the part cut specimens, acid etching with acid, can be clearly shown in the cross-section of the macrostructure defects, such as forging streamline distribution, cracks and inclusions, etc.. Metallographic inspection, that is, with the help of a metallographic microscope to observe the forging fracture microstructure inspection method, can check the carbide distribution, grain size and decarburization depth. Mechanical properties test items are mainly hardness, tensile strength and impact toughness. Sometimes, according to the design requirements of the parts, can also be used for cold bending test and fatigue test.
The above quality inspection items are sometimes used according to the design requirements and the actual production situation, sometimes one by one, sometimes according to each batch of forgings for random inspection. Through the quality inspection, the forgings can be evaluated to see if they are qualified. For defective forgings, the causes should be analysed and preventive measures proposed.
A metal working method. Using the plasticity of the metal, usually by heating the billet and then hammering or pressurising it, the workpiece is deformed to a specified shape and size, while also improving the mechanical properties of the metal material. A synonym for forging is also called casting. The metal is melted and poured into a mould to form the intended object, including the steps of mould making, metal melting, casting and cleaning. Sand moulds are widely used, so they are also called sand turning.
Zhangqiu forging can be divided into free forging, die forging, ring rolling and special forging.
1. Free forging, refers to the use of simple universal tools or directly between the upper and lower anvils of the forging equipment to apply external force to deform the billet to obtain the desired geometry and internal quality of the forging processing method. The forgings produced by the free forging method are called free forgings.
2. Die forging, forging can be divided into open die forging and closed die forging. The metal billet is compressed and deformed in the chamber of a certain shape of forging die to obtain forgings, which are generally used for the production of small weight and large quantity parts.
3. Ring grinding refers to the use of special equipment ring mill to produce ring-shaped parts of different diameters, also used for the production of car wheels, train wheels and other wheel parts.
4. Special forging including roll forging, wedge cross rolling, radial forging, liquid die forging and many other forging methods, are more suitable for the production of some special-shaped parts.
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