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Method for preparation of alloy extrudate

A technology of extruded profiles and alloys, which is applied in the field of non-ferrous metal preparation and processing, can solve the problems of unsatisfactory requirements for continuous profiles, high equipment requirements, and large material loss, and achieve saving raw material consumption, high mechanical properties, and reduced tonnage Effect

Inactive Publication Date: 2007-12-05
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this process, the metal needs to be melted first, then cooled, and then heated to a higher temperature. The whole process requires multiple sets of equipment and consumes a lot of energy; material loss, if you want to extrude the pipe, you need to cast a hollow ingot or perforate the ingot, which has high requirements for equipment and technology
In addition, the length of the extruded profile is limited by the size of the extrusion cylinder and the billet. The existing continuous extrusion process can only produce profiles with small cross-sections, and has high requirements for equipment, which cannot meet the demand for continuous profiles with larger cross-sections.

Method used

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  • Method for preparation of alloy extrudate

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Prepare magnesium alloy AZ31B bar with a diameter of φ20mm. First, preheat the extrusion barrel sprue 1, the extrusion barrel 5, and the extrusion pad 7 to 650°C, and the extrusion die 4 to 400°C. The cooling jacket 3 at the front end of the extrusion barrel is controlled at 60°C by circulating cooling water. . After the AZ31B alloy is melted, a semi-solid and semi-liquid slurry is made by mechanical stirring, and then injected into a φ95mm extrusion cylinder at 628°C with an injection volume of about 3kg. The extrusion rod is squeezed forward, the slurry gradually fills the extrusion barrel and solidifies at the front end of the extrusion barrel. After being extruded from the extrusion die 4, it is cooled by the secondary cooling system 9 at the exit of the extrusion die 4 to obtain the Bars with specifications required. The bar has a yield strength of 280MPa, a tensile strength of 320MPa, and an elongation of 13.5%. The microstructure of the bar is shown in Figure 2.

Embodiment 2

[0026] Prepare magnesium alloy AZ31B pipe, the outer diameter of the pipe is φ30mm, and the inner diameter is φ22mm. First, preheat the pouring port, the extrusion barrel, the extrusion pad, and the perforation needle to 600°C, the extrusion die to 300°C, and the cooling jacket 3 at the front end of the extrusion barrel is controlled at 20°C by circulating cooling water. After the AZ31B alloy is melted, a semi-solid and semi-liquid slurry is made by mechanical stirring, and then injected into a φ95mm extrusion cylinder at 628°C with an injection volume of about 2.5kg. The extrusion rod and the perforated needle are extruded forward, and the slurry gradually fills the extrusion cylinder and solidifies at the front end of the extrusion cylinder. After being extruded from the extrusion die, it is cooled twice at the exit of the extrusion die to obtain the required specifications Pipe. The yield strength of the pipe is 220MPa, the tensile strength is 300MPa, and the elongation is 12%....

Embodiment 3

[0028] Prepare magnesium alloy AZ3 1B continuous sheet. The thickness of the plate is 5mm and the width is 100mm. First, preheat the pouring port, the extrusion barrel, and the extrusion pad to 600°C, the extrusion die to 350°C, and the cooling jacket 3 at the front end of the extrusion barrel is controlled at 70°C by circulating cooling water. After the AZ31B alloy is melted, a semi-solid and semi-liquid slurry is made by mechanical stirring, and then injected into a φ95mm extrusion cylinder at 628°C. The first injection volume is about 3kg. The extrusion rod is squeezed forward, the slurry gradually fills the extrusion barrel and solidifies at the front end of the extrusion barrel, and is extruded in the extrusion die. The extruded part is cooled at the exit of the extrusion die to obtain the required specifications. After extruding about 1kg, the squeeze rod drives the squeeze pad back to the left of the pouring port, and quickly pours about 1kg of the prepared semi-solid and s...

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Abstract

The process of extruding alloy section includes the following steps: 1. pre-heating the extrusion chamber and the extrusion pad in the extruder to 300-650 deg.c; 2. pre-heating the extrusion die to 300-500 deg.c and introducing coolant to the cooling jacket in the front end of the extrusion chamber to control the temperature at 20-200 deg.c; 3. forming semi-solid and semi-liquid pulp with the metal melt and injecting quantitatively into the pouring slot of the extrusion chamber; and 4. pushing forwards the extrusion stem for the pulp to fill the extrusion chamber and solidify in the front end of the extrusion chamber, extruding out the plastically deformed pulp from the die, and cooling for the second time to obtain the required section. The process may be realized in a common extruder through slight modification, and can result in saving in machining and saving in material.

Description

Technical field [0001] The invention belongs to the field of non-ferrous metal preparation and processing, and specifically relates to a method for preparing alloy profiles by extrusion. Background technique [0002] Extrusion molding is an important forming method for alloys. The extrusion method can prepare high-performance profiles with different cross-sectional shapes. The usual extrusion process is to first cast an alloy billet, then process the billet to the required size, then heat it to an appropriate temperature range, and finally put it into an extrusion barrel for extrusion. In this process, the metal needs to be melted and then cooled, and then heated to a higher temperature. The whole process requires multiple sets of equipment and consumes a lot of energy; it will cause a lot of damage during the machining process of casting and ingots. In order to squeeze the pipe, it is necessary to cast a hollow ingot or perforate the ingot, which requires high equipment and tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/02B21C31/00B21C23/14B21C23/08
Inventor 徐骏樊中云张少明石力开杨必成许建国杜文龙
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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