With the development of economy and science and technology, the quality requirements of extruded products are higher and higher, and some special requirements are put forward in some aspects, which promote the rapid development of brass sheet reverse extrusion technology.
A new type of reverse extrusion process for brass sheet suitable for various metals and alloys as well as other metals was developed. According to the need, the structure of brass sheet extruder is constantly innovated and improved, and the new reverse extruder with different uses and different structures is developed. According to the requirements of production technology and product quality, the die and new extrusion tool materials of reverse extruder with new structure are developed.
The main principles of the selection of brass sheet reverse extrusion technology: (1) according to the flow characteristics of different metal extrusion, which materials should be considered to use reverse extrusion can be determined. For example, in the reverse extrusion of copper, brass and other alloys, the metal flow is between type A and type B, and the change of temperature and pressure in the process of extrusion is very small. It is beneficial to improve the uniformity of microstructure and properties of extruded products by using flat die unlubricated reverse extrusion of brass sheet and copper alloy wire, bar, profile and pipe.
(2) The external friction condition has a very obvious influence on the flow of brass sheet. Different external friction conditions will lead to different types of metal flow. Therefore, for materials that need to be lubricated and extruded, it is more beneficial to use reverse extrusion.
(3) Reverse extrusion is suitable for the extrusion production of brass sheet with high precision, fine structure and no coarse crystal ring and narrow extrusion temperature range. The force acting on the metal during reverse extrusion, and the force acting on the metal during reverse extrusion of the brass strip, there is no relative motion between the metal billet and the extrusion sheet.
Post time: Aug-25-2022