51 Steel Tube Network News: Metal extrusion has many important characteristics such as good variety variety and high production flexibility. It is a new material and new material for industrial production of metal pipe and bar wire profiles, various composite materials, powder materials, and high-performance and difficult-to-process materials. Product preparation, processing of important methods. With the rapid development of economic construction and high technology, metal extrusion technology has developed rapidly. In the past ten years, China has achieved remarkable achievements in metal extrusion production, high-end product development, localization of heavy-duty and super-heavy-duty extrusion equipment, and production line construction. Currently, it is actively developing new technologies for metal extrusion.
1. Isothermic extrusion technology.
In order to overcome the changes in the structure and properties of the product caused by temperature changes in the extrusion process and to increase the extrusion speed, isothermal extrusion processes have received increasing attention. The methods for isothermal extrusion include billet temperature heating/cooling, tool and mold temperature control, parameter optimization, thermal model-based speed control, and temperature-speed on-line detection closed-loop control. Among them, the temperature-speed on-line detection closed-loop control works best, but it is difficult to achieve, it is the ideal development direction of the isothermal extrusion process. The temperature-speed closed loop control method measures the change of the product temperature at the exit of the die hole on-line during the extrusion process, and feeds back the measurement result, thereby adjusting the extrusion speed in real time so as to achieve the purpose of isothermal extrusion. In addition to the temperature-speed closed-loop control, the product temperature at the die-out hole can be kept constant. Compared with ordinary isostatic extrusion, the temperature-speed closed-loop control is often significantly increased in the early and middle stages of extrusion due to a significant increase in speed in many cases. Shorten the extrusion time and increase productivity. However, because of the characteristics such as the speed of the extruder, the frequency of the extruder, and the non-linear output of the extruder speed, it is often difficult to obtain the desired control effect. Therefore, the isotherm extrusion technology developed by the joint control of various methods has attracted attention. Through the use of a special structural extrusion die to control the flow of metals, various layered composite materials can be formed. Some of these layered composite materials are difficult or even impossible to form using existing plastic processing methods, such as using two or more layers. The material forms the same cladding layer (that is, a cladding layer that is integrally welded with different materials in the circumferential direction), and is simultaneously coated with two or more layers, a multi-layer composite pipe or hollow section, a special layered composite material, and the like.
2. Excessive billet extrusion.
The multi-blank extrusion method is different from the case where only one billet is used in conventional extrusion, but a plurality of barrel holes are formed on a barrel as required, and billets having the same or different size and material are loaded in each barrel hole. Then squeeze at the same time. In the additional bending extrusion method, the bending deformation device plays a guiding role in the moving direction of the profile, and simultaneously applies bending deformation to the profile after the extrusion die hole to obtain the desired arc profile. Therefore, the additional bending extrusion method is actually an extrusion-bending combined processing method.
3. Core extrusion.
In order to meet the needs of certain special applications, such as slender special steel, high-temperature alloy pipe, copper clad steel wire, etc., core extrusion method is a simple and feasible method. If the core rod is changed to the core material of the covered wire rod, the resulting product is a coated wire rod. The most important feature of core extrusion is that it can be realized on ordinary extruders with independent perforation systems. It is developed based on the combination of the characteristics of fixed needle extrusion and follow-up needle extrusion. In the method, the mandrel or the core material enters the die hole from the back of the extruder through the hollow needle support and the hollow needle, and is driven out of the die by the frictional force exerted on the surface of the mandrel by the extruded metal. hole.
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1. Isothermic extrusion technology.
In order to overcome the changes in the structure and properties of the product caused by temperature changes in the extrusion process and to increase the extrusion speed, isothermal extrusion processes have received increasing attention. The methods for isothermal extrusion include billet temperature heating/cooling, tool and mold temperature control, parameter optimization, thermal model-based speed control, and temperature-speed on-line detection closed-loop control. Among them, the temperature-speed on-line detection closed-loop control works best, but it is difficult to achieve, it is the ideal development direction of the isothermal extrusion process. The temperature-speed closed loop control method measures the change of the product temperature at the exit of the die hole on-line during the extrusion process, and feeds back the measurement result, thereby adjusting the extrusion speed in real time so as to achieve the purpose of isothermal extrusion. In addition to the temperature-speed closed-loop control, the product temperature at the die-out hole can be kept constant. Compared with ordinary isostatic extrusion, the temperature-speed closed-loop control is often significantly increased in the early and middle stages of extrusion due to a significant increase in speed in many cases. Shorten the extrusion time and increase productivity. However, because of the characteristics such as the speed of the extruder, the frequency of the extruder, and the non-linear output of the extruder speed, it is often difficult to obtain the desired control effect. Therefore, the isotherm extrusion technology developed by the joint control of various methods has attracted attention. Through the use of a special structural extrusion die to control the flow of metals, various layered composite materials can be formed. Some of these layered composite materials are difficult or even impossible to form using existing plastic processing methods, such as using two or more layers. The material forms the same cladding layer (that is, a cladding layer that is integrally welded with different materials in the circumferential direction), and is simultaneously coated with two or more layers, a multi-layer composite pipe or hollow section, a special layered composite material, and the like.
2. Excessive billet extrusion.
The multi-blank extrusion method is different from the case where only one billet is used in conventional extrusion, but a plurality of barrel holes are formed on a barrel as required, and billets having the same or different size and material are loaded in each barrel hole. Then squeeze at the same time. In the additional bending extrusion method, the bending deformation device plays a guiding role in the moving direction of the profile, and simultaneously applies bending deformation to the profile after the extrusion die hole to obtain the desired arc profile. Therefore, the additional bending extrusion method is actually an extrusion-bending combined processing method.
3. Core extrusion.
In order to meet the needs of certain special applications, such as slender special steel, high-temperature alloy pipe, copper clad steel wire, etc., core extrusion method is a simple and feasible method. If the core rod is changed to the core material of the covered wire rod, the resulting product is a coated wire rod. The most important feature of core extrusion is that it can be realized on ordinary extruders with independent perforation systems. It is developed based on the combination of the characteristics of fixed needle extrusion and follow-up needle extrusion. In the method, the mandrel or the core material enters the die hole from the back of the extruder through the hollow needle support and the hollow needle, and is driven out of the die by the frictional force exerted on the surface of the mandrel by the extruded metal. hole.
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