，
Countermeasures to Prevent and Eliminate Grain Inheritance in Forging and Pressing
Forging and pressing are important processes in the manufacture of metal materials, but in the process of forging and pressing, grain inheritance easily occurs. Grain inheritance has a great impact on the performance of metal materials, which affects the performance of molds and the dimensional accuracy of the workpieces. This article will analyze the causes and countermeasures of grain inheritance in forging and pressing, in order to provide some reference.
The Cause of Grain Inheritance
Crystallization is the interchange process between microcrystals and the solid solution. During the process of forging and pressing, the recrystallization of the metal material is completed in a short time. The continuous recrystallization of the metal causes grain expansion, which causes the small grain size to become large, and the large grain size to further expand, which eventually causes the grain to become financial large. Compared with the original single crystal grain size of the metal material, the grain size has greatly increased, resulting in grain inheritance.
Countermeasures
1.Choose high-quality raw materials: The quality of the raw materials should be checked when purchasing, and only qualified raw materials should be purchased to ensure the continuity of the final product involving grain size.
2.Adopt correct heat treatment process: Choosing the right heat treatment process is very important for improving the performance of metal materials. It not only can ensure that the metal material performs better, but also can prevent the grain inheritance during the forging and pressing process.
3.Adopt reasonable deformation force: Deformation force affects the internal structure of metal materials, so it must be controlled by a reasonable range. If the deformation force is too large, grain enlargement will occur, resulting in grain inheritance; if the deformation force is too small, the mold and workpiece will not reach the design requirements, so the deformation force should be based on the requirements of the product.
4.Strengthen the heat treatment of products: Taking measures such as tempering after forging can significantly reduce the grain inheritance of the finished product. At the same time, the product should be subjected to aging treatment, so that the grain can be made more uniform and the grain inheritance is greatly reduced.
5.Use the right equipment: The selection of the forming equipment should not be wrong. The forged products must be forged in the regular forging equipment with reasonable pressure, so as to ensure its final crystalline structure.
The above are some countermeasures to prevent and eliminate grain inheritance in forging and pressing. To sum up, to solve the problem of grain inheritance in forging and pressing, it is necessary to carefully choose high-quality raw materials, take reasonable deformation force and heat treatment, select the appropriate mold forming equipment and improve the heat treatment process.
