A Numerical Simulation-Based Method for Obtaining Isothermal Extrusion Velocity Curve
A technology of isothermal extrusion and speed curve, which is applied in the field of material science, can solve the problems of no speed curve, many applications, and failure to realize isothermal extrusion.
Active Publication Date: 2016-01-20
CENT SOUTH UNIV
View PDF6 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
In comparison, the billet temperature gradient value of the first method is difficult to accurately determine and difficult to realize, while the second method is used more
After reviewing the literature, many scholars have proposed a speed change curve to achieve isothermal extrusion, but such a speed standard has no basis for realizing isothermal extrusion, nor does it give how such a speed curve is obtained
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0030] The method of the invention aims at keeping the outlet temperature of the product stable, obtains the isothermal extrusion speed curve and inputs it to the extruder control system. The method for obtaining the isothermal extrusion speed curve is as follows: multiple times of simulating the extrusion process for the isothermal extrusion blank to be processed at different speeds, and fitting the speed curve for realizing isothermal extrusion. According to the performance of the billet and the speed range of the extruder, set the outlet temperature that is beneficial to the performance of the product. According to the actual production experience, the heating temperature, friction coefficient, heat transfer coefficient, ambient temperature, mold shape and size and extrusion coefficient of the extrusion tool are determined, and the...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a numerical-simulation-based isothermal extrusion speed curve acquisition method. The method comprises the following steps: setting simulation extrusion conditions and a simulation extrusion speed on the basis of blank material performance and a speed adjustment range of an extruder; setting an outlet temperature which is favorable to a product performance on the basis of actual production experience; performing constant-speed simulation extrusion on a blank material to be processed repeatedly to obtain a highest-extrusion stroke curve at different extrusion speeds; intersecting the curve and the set outlet temperature, fitting data points to obtain an extrusion speed-stroke curve of isothermal extrusion, and performing functional relationship transformation to obtain an extrusion speed-time curve of the isothermal extrusion; and inputting the obtained extrusion speed-time curve into an extruder control system, and controlling the speed change of a plunger of the extruder to keep the temperature of a product stable. According to the method provided by the invention, the product production quality can be improved, so that the product tissue performance is uniform and stable, the extrusion production efficiency is prompted, and the extrusion production process is improved.
Description
technical field [0001] The invention relates to a metal material extrusion processing technology in the field of material science and technology, and in particular provides an isothermal extrusion speed curve and an acquisition method in the aluminum alloy hot extrusion processing process. Background technique [0002] Extrusion is a pressure processing method that applies pressure to one end of the billet placed in the container (extrusion cylinder) to make it pass through the die hole to achieve forming, such as figure 1 shown. In aluminum and aluminum alloy semi-finished products, extrusion is one of the main forming processes, and extrusion products account for 1 / 3 of all semi-finished products, especially the production of building profiles. [0003] In the extrusion process, the extrusion outlet temperature is an important parameter, which determines whether the structure and properties of the extruded product are uniform and the quality of the extruded product is sta...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): B21C23/00
Inventor 谭建平杨武杨俊
Owner CENT SOUTH UNIV