In mold manufacturing, we can usually hear casti […]
In mold manufacturing, we can usually hear casting and forging. What is the difference between these two manufacturing processes?
Casting mold is a process of smelting metal into a liquid that meets certain requirements and pouring it into a mold. After cooling, solidification, and cleaning, a casting (part or blank) with a predetermined shape, size and performance is obtained. It is a modern machine The basic process of the manufacturing industry.
The cost of the blank produced by casting is low, and it can show its economical efficiency for parts with complex shapes, especially with complicated inner cavities; at the same time, it has wide adaptability and better comprehensive mechanical properties. However, the materials (such as metal, wood, fuel, molding materials, etc.) and equipment (such as metallurgical furnaces, sand mixers, molding machines, core making machines, shakeout machines, shot blasting machines, cast iron plates, etc.) Many, and will produce dust, harmful gases and noise and pollute the environment.
1. There are many types of casting, according to the habit of modeling methods:
1.Ordinary sand casting, including three types: green sand, dry sand and chemically hardened sand.
2.Special casting, according to the modeling material, can be divided into special casting with natural mineral sand and gravel as the main modeling material (such as investment casting, clay casting, casting workshop shell casting, negative pressure casting, solid casting, ceramic casting Etc.) and special casting with metal as the main mold material (such as metal mold casting, pressure casting, continuous casting, low pressure casting, centrifugal casting, etc.).
2. The casting process usually includes:
A.Preparation of casting molds (containers that make liquid metal into solid castings). The casting molds can be divided into sand, metal, ceramic, clay, graphite, etc. according to the materials used; according to the number of times of use, they can be divided into disposable type and half type And type. The pros and cons of mold preparation are the main factors affecting the quality of castings;
B.The melting and pouring of cast metal, cast metal (casting alloy) mainly includes cast iron, cast steel and cast non-ferrous alloy;
C.Casting processing and inspection. Casting processing includes removing foreign bodies on the core and surface of castings, removing pouring risers, shoveling burrs and draping seams and other protrusions, as well as heat treatment, shaping, anti-rust treatment and rough machining.