The existence of defects in titanium forgings will affect the processing quality or processing quality of subsequent processes, and some will seriously affect the performance and use of the forgings, and even greatly reduce the service life of the finished products and endanger safety. Therefore, in order to ensure or improve the quality of forgings, in addition to strengthening quality control in the process and taking corresponding measures to prevent the occurrence of forging defects, necessary quality inspections should also be carried out to prevent subsequent processes (such as heat treatment, surface treatment, cold working) And forgings with defects that have adverse effects on performance flow into the follow-up process. After quality inspection, remedial measures can be taken for the forgings made according to the nature of the defect and the degree of influence to use, so that it meets the technical standards or requirements for use.
Therefore, in a sense, the quality inspection of forgings is to check the quality of the forgings that have been made on the one hand, and to point out the direction of improvement for the forging process on the other, so as to ensure that the quality of forgings meets the requirements of forging technical standards and meets the design Requirements on processing and use. The inspection of forging quality includes the inspection of appearance quality and internal quality. Appearance quality inspection mainly refers to the inspection of the geometric size, shape, surface condition and other items of the forging; the internal quality inspection mainly refers to the inspection of various items such as the chemical composition, macrostructure, microstructure and mechanical properties of the forging.
Specifically, the appearance quality inspection of forgings is to check whether the shape and geometric dimensions of the forgings meet the specifications of the drawings, whether the forgings have defects on the surface, what are the defects, and what are their morphological characteristics. The inspection content of the surface condition is generally to check whether the forging surface has surface cracks, folds, wrinkles, pits, orange peel, blisters, scars, corrosion pits, bruises, foreign objects, underfill, pits, lack of meat, scratches Defects such as marks. The internal quality inspection is to check the internal quality of the forging itself. It is a quality condition that cannot be found by the appearance quality inspection. It includes the inspection of the internal defects of the forgings and the inspection of the mechanical properties of the forgings. For important parts, key parts or large forgings Chemical composition analysis should also be performed. For internal defects, we will inspect the forgings through low-power inspection, fracture inspection, and high-power inspection to check whether there are internal cracks, shrinkage holes, porosity, coarse crystals, white spots, dendrites, streamlines that do not conform to the shape, and streamlines turbulence. , Flow through, coarse crystal ring, oxide film, delamination, overheating, overburning organization and other defects. For the mechanical properties, it is mainly to check the normal temperature tensile strength, plasticity, toughness, hardness, fatigue strength, high temperature instantaneous rupture strength, high temperature permanent strength, permanent plasticity and high temperature creep strength.
After forgings are made into parts, the force, importance, and working conditions are different during use, and the materials and metallurgical processes used are also different. Therefore, different parts are classified into categories according to the above conditions and the requirements of this department. , Different departments and different standards have different classifications of forgings. But no matter what, the overall quality inspection of forgings is inseparable from two major types of inspections, namely, the inspection of appearance quality and internal quality. It is just that the types of forgings are different, and the specific inspection items, inspection quantities and inspection requirements are different. . For example, some industrial departments classify structural steel, stainless steel, and heat-resistant steel forgings into Type IV for inspection, and some departments divide aluminum alloy forgings and die forgings into Type III for inspection according to their usage conditions, and some departments classify aluminum alloy, Copper alloy forgings are classified into Category IV for inspection.
grade 5 titanium rod Gr2 Polished Titanium Wire titanium seamless tubing 6al4v titanium plate
Therefore, in a sense, the quality inspection of forgings is to check the quality of the forgings that have been made on the one hand, and to point out the direction of improvement for the forging process on the other, so as to ensure that the quality of forgings meets the requirements of forging technical standards and meets the design Requirements on processing and use. The inspection of forging quality includes the inspection of appearance quality and internal quality. Appearance quality inspection mainly refers to the inspection of the geometric size, shape, surface condition and other items of the forging; the internal quality inspection mainly refers to the inspection of various items such as the chemical composition, macrostructure, microstructure and mechanical properties of the forging.
Specifically, the appearance quality inspection of forgings is to check whether the shape and geometric dimensions of the forgings meet the specifications of the drawings, whether the forgings have defects on the surface, what are the defects, and what are their morphological characteristics. The inspection content of the surface condition is generally to check whether the forging surface has surface cracks, folds, wrinkles, pits, orange peel, blisters, scars, corrosion pits, bruises, foreign objects, underfill, pits, lack of meat, scratches Defects such as marks. The internal quality inspection is to check the internal quality of the forging itself. It is a quality condition that cannot be found by the appearance quality inspection. It includes the inspection of the internal defects of the forgings and the inspection of the mechanical properties of the forgings. For important parts, key parts or large forgings Chemical composition analysis should also be performed. For internal defects, we will inspect the forgings through low-power inspection, fracture inspection, and high-power inspection to check whether there are internal cracks, shrinkage holes, porosity, coarse crystals, white spots, dendrites, streamlines that do not conform to the shape, and streamlines turbulence. , Flow through, coarse crystal ring, oxide film, delamination, overheating, overburning organization and other defects. For the mechanical properties, it is mainly to check the normal temperature tensile strength, plasticity, toughness, hardness, fatigue strength, high temperature instantaneous rupture strength, high temperature permanent strength, permanent plasticity and high temperature creep strength.
After forgings are made into parts, the force, importance, and working conditions are different during use, and the materials and metallurgical processes used are also different. Therefore, different parts are classified into categories according to the above conditions and the requirements of this department. , Different departments and different standards have different classifications of forgings. But no matter what, the overall quality inspection of forgings is inseparable from two major types of inspections, namely, the inspection of appearance quality and internal quality. It is just that the types of forgings are different, and the specific inspection items, inspection quantities and inspection requirements are different. . For example, some industrial departments classify structural steel, stainless steel, and heat-resistant steel forgings into Type IV for inspection, and some departments divide aluminum alloy forgings and die forgings into Type III for inspection according to their usage conditions, and some departments classify aluminum alloy, Copper alloy forgings are classified into Category IV for inspection.
grade 5 titanium rod Gr2 Polished Titanium Wire titanium seamless tubing 6al4v titanium plate
No comments:
Post a Comment