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The difference between casting, stamping and forging

Posted by: Fymicohuang 2021-09-13 Comments Off on The difference between casting, stamping and forging

With the improvement of living standards, people have a deeper understanding of mechanical processing technology and more choices. They have different choices for different processing parts. Henan Chemical Machinery Manufacturing Co., Ltd. focuses on the casting and processing of large castings. I also saw the purchasers of forgings on the website, so what is the difference between them? Let me share the difference between casting and stamping forging.

Let me talk about the difference between forging and casting

(1) Casting: It is to turn the metal liquid without shape into a solid with shape.

Forging: It is to transform a solid of one shape into a solid of another shape.

Casting is like playing with wax. You buy wax (scrap steel, or pig iron) and then turn the wax into liquid, put it in a Mold, and then you can get different shapes. (Solid-liquid-solid)

Forging is like the process of making dough. You knead a small dough and put it in a mold to make products of different shapes. It is almost a solid shape that can change to other shapes (solid to solid) at high temperatures.

The so-called die casting is the process of casting molten metal into a model to obtain a casting. The foundry profession focuses on the metal smelting process and the control of the process during the casting process.

Forging is plastic forming in the solid state, which can be divided into hot working and cold working, such as extrusion, drawing, piercing, punching, etc., all belong to forging.

(2) Forging is slowly forming, and casting is forming at one time

Casting: The molten liquid metal fills the cavity and cools. Pores are prone to occur in the middle of the workpiece.

Forging: It is mainly formed by extrusion at high temperature. Can refine the crystal grains in the part.

2. The difference between free forging and die forging

Free forging is a processing method in which heated metal blanks are placed on the forging equipment and between the lower iron, and impact or pressure is applied to directly cause the blanks to plastically deform, thereby obtaining the required forgings. Free forging is due to forgings The shape is simple, the operation is flexible, and it is suitable for the production of single, small batch and heavy forgings. Free forging is divided into manual free forging and machine free forging. Manual free forging has low production efficiency and high labor intensity. It is only used for repair or simple, small, In the production of small batches of forgings, in modern industrial production, machine free forging has become the main method of forging production.In the manufacture of heavy machinery, it has a particularly important role.

The full name of die forging is model forging, which is formed by placing the heated blank in a forging die fixed on the die forging equipment.

Die forging can be performed on a variety of equipment. In industrial production, steam-air hammers are mostly used for die forging on hammers, with a tonnage ranging from 5KN to 300KN (0.5 to 30t). Hot die forging presses are commonly used for die forging on the press, with a tonnage of 25000KN~63000KN.

The forging die structure of die forging includes single die forging die and multi-chamber forging die. As shown in Figure 3-13, it is a single-die forging die. It uses dovetail grooves and inclined wedge to fix the forging die to prevent it from coming out and moving left and right; the cooperation of keys and keyways makes the forging die accurately positioned and prevents forward and backward movement. The single-die cavity is generally the final forging die cavity. Forging, air hammering is often required to make the blank, and then the final forging die cavity is hammered several times once to form, and finally the forging is removed to remove the flash.

3. The difference between casting, forging, stamping and casting

Casting is to melt the raw materials and let them form naturally in the forming mold

Forging is to heat the raw material to a certain temperature and then use a tool to forge it into shape

Stamping is to stamp the raw material with a suitable stamping die

Die Casting is to use pressure to inject the melted raw materials into the mold on the basis of casting to obtain a higher density or more precise shape.

Casting: The molten liquid metal fills the cavity and cools. Pores are prone to occur in the middle of the workpiece.

(2) Forging: It is mainly formed by extrusion at high temperature. Can refine the crystal grains in the part.

The thickness of the parts is basically the same, and it is suitable for the stamping of sheet metal forming.

The thickness of the parts is very different, the shape is complicated, and the parts that are not subject to heat are die-cast.

  • 1. There are two types of casting: high pressure casting and low pressure casting. Simply put, after the metal is melted, the pressure to press the model is different, and the temperature at which the metal is heated is different from the machine used for casting.
  • 2. Forging is also a method of casting. The difference is that the temperature during forging is lower, and some methods can make metal into finished products in a semi-melted state.
  • 3. Stamping is the process of making semi-finished products into finished products with punching machines and other machines at room temperature.
  • 4. Die-casting is also a method of high-temperature casting. When encountering a casting with a more complex structure and more difficult, you can use a die-casting machine to heat the metal into a liquid state, press it into the mold, and open the mold after cooling to take out the product. Casting method.

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