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2022.2.27
Non ferrous and ferrous metal castings are prone to defects such as porosity, shrinkage and porosity in the casting process. If these tiny holes are connected, the casting will leak under the action of air pressure or hydraulic pressure, resulting in the scrapping of the product. Infiltration process is an effective method to solve the above problems.
It is applicable to the infiltration of steam, water and oil leakage of aluminum alloy, zinc alloy, copper alloy, cast iron and steel castings.
Typical infiltration castings include engine block, cylinder head, steam inlet manifold, oil pump, nozzle, water pump, valve cover, cast oil pan, carburetor shell, gearbox shell, cast iron plate, crankcase, compressor, ABS controller, power steering gear, automobile hub, fuel pump, natural gas control valve, hydraulic valve, filter, oil cylinder, cylinder, hydraulic pump, cooling pump Enclosed aircraft instruments and electronic instrument shields, air braking parts and various gas instruments.
Infiltration related steps:
(1) put the parts into the infiltration tank.
(2) vacuum treatment: start the vacuum pump, the vacuum pressure is above -0.09mpa, and use vacuum to extract the air (or water, oil, etc.) in the pores or cracks of the parts. The vacuum pumping time is 15 minutes.
(3) suck the glue solution into the infiltration tank with vacuum. The quantity of glue solution shall be subject to the parts in the immersion basket. Remove the vacuum to normal pressure.
(4) if necessary, turn on the compressor and use compressed air to hydraulically inject the glue into the pores or cracks in the parts. The compressed air pressure depends on the specific situation. If there are no special requirements, the compressed air pressure can be 0.8-1.0mpa for 15 minutes. After infiltration, open the vent valve to relieve pressure.
The infiltration liquid on the surface of the product must be cleaned in time, and it will agglutinate on the surface after a long time. Infiltration is very effective for air holes in aluminum die castings, which can basically avoid air leakage in aluminum die casting products. Because the products are used in high pressure occasions, it is ensured that the products can not leak.
Infiltration scope:
Applicable to the infiltration of air and oil leakage of zinc alloy, copper alloy, aluminum alloy, cast iron and steel castings. Typical infiltration parts such as engine block, cylinder head, intake manifold, oil pump, nozzle, water pump, valve cover, cast oil pan, carburetor housing, gearbox housing, crankcase, compressor, ABS controller, power steering gear, automobile hub, fuel pump, natural gas control valve, hydraulic valve, cooling pump, sealed aircraft instrument, and electronic instrument shield Air brake parts and various gas instruments, etc. These castings are permanently sealed by injecting infiltrating agent into micropores, and their pressure bearing capacity reaches the fracture strength of castings.
Infiltration principle:
Infiltration is also called infiltration and infiltration. Through the vacuum pressure infiltration equipment, the infiltration glue (infiltration agent) is fully penetrated into the micropores of the workpiece to fill the micropore gap, which effectively prevents the leakage and corrosion of the workpiece, so as to achieve the purpose of sealing and leakage repair.
Specifically, it can be through infiltration technology.
1. To prevent pressure leakage, a large number of scrap castings can be charged.
2. Improve material strength.
3. Prevent corrosion.
4. Improve the quality of electroplating and surface paint decorative parts.
5. Improve the cutting performance of metal parts.
At present, many manufacturers at home and abroad have recognized infiltration technology as an essential process.
Abrasive infiltration treatment technology and device:
In the grinding process, the solidified film melts under the action of grinding heat, so that the infiltrating agent acts directly on the grinding area, reduces the friction between abrasive particles and workpieces, reduces the grinding temperature, reduces the adhesion and blockage on the surface of abrasive tools, and reduces the wear of abrasive tools, so as to effectively improve the grinding performance of abrasive tools, improve the surface quality of grinding parts, and avoid grinding burns and grinding cracks. The abrasive infiltration device is a device designed according to the above principle.
Scope of application:
It is applicable to the infiltration treatment of various abrasives with micro pores. The infiltrated Abrasives can be used to grind titanium alloy, superalloy, ultra-high strength steel, high speed steel, hardened steel, cast iron and other materials. The infiltrated abrasives are not only suitable for wet grinding, but also suitable for dry grinding, Especially in the case of insufficient supply of dry grinding and grinding, the effect is particularly obvious.