Materials of cast and forged valves
Classification:
Release Time：2017-12-04
Casting valve is cast into the valve, the general casting valve pressure rating is relatively low. Forged valves are forged and are generally used in high-grade pipelines. 1. casting 1. Casting: It is the process of smelting metal into liquid that meets certain requirements and pouring it into the casting mold. After cooling, solidification and cleaning, the process of obtaining castings (parts or blanks) with predetermined shape, size and performance is obtained. The basic process of modern machinery manufacturing industry. 2. The cost of the blank produced by casting is low, and it can show its economy for parts with complex shapes, especially with complex cavities; at the same time, it is suitable
Casting valve is cast into the valve, the general casting valve pressure rating is relatively low. Forged valves are forged and are generally used in high-grade pipelines.
1. casting
1, casting: is the metal smelting into a liquid that meets certain requirements and poured into the mold, after cooling solidification, cleaning treatment to obtain a predetermined shape, size and performance of the casting (parts or blank) process. The basic process of modern machinery manufacturing industry.
2. The cost of the blank produced by casting is low, and it can show its economy for parts with complex shapes, especially for parts with complex cavities; at the same time, it has a wide adaptability and good comprehensive mechanical properties.
However, there are many materials and equipment required for casting production, and it will produce dust, harmful gases and noise to pollute the environment.
Casting is an earlier metal hot working process that humans have mastered, and it has a history of about 6000 years.
5. There are many types of casting, which are divided into: ① Ordinary sand casting, including wet sand mold, dry sand mold and chemically hardened sand mold. ② special casting, according to the modeling materials can be divided into natural mineral sand as the main modeling materials of special casting and metal as the main casting materials of special casting two categories.
6. The casting process usually includes: ① preparation of casting mold (a container that makes liquid metal a solid casting). The casting mold can be divided into sand mold, metal mold, ceramic mold, mud mold, graphite mold, etc. according to the materials used. It can be divided into disposable mold, semi-permanent mold and permanent mold according to the number of uses. The quality of casting mold preparation is the main factor affecting the quality of casting. ② Melting and pouring of cast metal, cast metals (cast alloys) mainly include cast iron, cast steel and cast non-ferrous alloys; ③ casting treatment and inspection, casting treatment includes removal of foreign bodies on the surface of the core and castings, removal of gating risers, shoveling and grinding of protrusions such as spines and seams, as well as heat treatment, shaping, rust prevention treatment and roughing. Inlet pump valve
2. forging
1. Forging: It is a processing method that uses forging machinery to apply pressure to metal blanks to produce plastic deformation to obtain forgings with certain mechanical properties, certain shapes and sizes.
2. One of the two major components of forging. Through the forging can eliminate the casting of metal loose, welding holes, the mechanical properties of forgings are generally better than the same material castings. The important parts of machinery with high load and severe working conditions, in addition to the simple shape of the available rolled plates, profiles or weldments, the use of forgings.
3, forging according to the forming method can be divided into: ① open forging (free forging). The use of impact or pressure to make the metal in the upper and lower two (anvil) between the deformation to obtain the required forgings, mainly manual forging and mechanical forging two. ② Closed mode forging. Metal blanks are deformed under pressure in a forging die bore with a certain shape to obtain forgings, which can be divided into die forging, cold heading, rotary forging, extrusion, etc. According to the deformation temperature forging can be divided into hot forging (processing temperature is higher than the recrystallization temperature of the billet metal), warm forging (lower than the recrystallization temperature) and cold forging (room temperature).
4, forging materials are mainly various components of carbon steel and alloy steel, followed by aluminum, magnesium, titanium, copper and its alloys. The correct choice of forging ratio has a lot to do with improving product quality and reducing costs.
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