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A method for improving rolling forming of magnesium alloy plate and strip

A magnesium alloy plate and strip rolling technology, which is applied in metal rolling, temperature control, metal processing equipment, etc., can solve the problems of unfavorable slab forming and increased cost, achieve good improvement effect and reduce edge temperature drop , the effect of controlling widthwise reduction

Active Publication Date: 2019-10-01
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing pre-side pressure method uses vertical roller mills for rolling, adding a (set) vertical roller mill before the conventional rolling mill will undoubtedly increase a lot of cost
In addition, if the width and thickness of the pre-laminated slab are relatively large, the deformation is mainly concentrated on the edges on both sides of the slab width, which will cause an obvious dog-bone shape in the contact area between the slab and the roller or warpage in the middle of the slab, which is not conducive to the slab subsequent shaping of

Method used

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  • A method for improving rolling forming of magnesium alloy plate and strip
  • A method for improving rolling forming of magnesium alloy plate and strip
  • A method for improving rolling forming of magnesium alloy plate and strip

Examples

Experimental program
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Effect test

Embodiment 1

[0052] A method for improving the rolling and forming of magnesium alloy plates and strips is a pre-rolling and large-pressure blanking method, and the schematic diagram of the pre-rolling large-pressure blanking is shown in figure 1 ②, the schematic diagram of the process flow is shown in Figure 9 , including the following steps:

[0053] Step 1: Pre-rolling

[0054] The slab blank with a size of 150mm×80mm×30mm is heated to 400°C in an orbital box-type resistance heating furnace and transferred to a two-roll cold rolling mill. The rolls of the two-roll cold rolling mill are subjected to 8% reduction in the first pass Pre-rolling to obtain the pre-rolled billet; wherein, the rolling temperature of the two-roll cold rolling mill is room temperature, and the rolling speed is set to 18m / min, 48m / min and 72m / min respectively for three groups of parallel experiments ;

[0055] Step 2: Rolling under heavy pressure

[0056] Immediately afterwards, the billet after the pre-rolli...

Embodiment 2

[0061] A method for improving the rolling and forming of magnesium alloy plate and strip is a pre-rolling large-pressure blanking method, which specifically includes the following steps:

[0062] Step 1: Pre-rolling

[0063] Use a heating device to heat the rolls of the two-roll mill to keep the roll temperature at 150±10°C, heat the slab blank with a size of 800mm×340mm×220mm to 350°C in an orbital box-type resistance heating furnace, and transfer it to the two-roll mill Carry out pre-rolling with 8% reduction in the first pass to obtain the billet after pre-rolling;

[0064] Step 2: Rolling under heavy pressure

[0065] Subsequently, the pre-rolled billet is subjected to a second pass of high-reduction rolling with a reduction of 80% at a rolling speed of 48 m / min. After rolling, the macroscopic appearance of the plate and the properties of different positions in the width direction of the plate were analyzed.

[0066] See Figure 5 ,From Figure 5 It can be obtained th...

Embodiment 3

[0069] A method for improving the rolling forming of magnesium alloy plates and strips, which is a method of continuous rapid side forging and pre-rolling intersecting and then large-pressure blanking method. figure 1 ①+②, the schematic diagram of the process flow is shown in Figure 10 , including the following steps:

[0070] Step 1: Continuous rapid side forging

[0071] Use a heating device to heat the rolls of the two-roll mill to keep the temperature of the rolls at 150±10°C, heat the slab blank with a size of 1000mm×520mm×450mm to 350°C in an orbital box-type resistance heating furnace, and use a small tonnage forging machine Carry out the first pass of 10% continuous rapid side forging to obtain the blank after side forging;

[0072] Step 2: Pre-rolling

[0073] The billet after side forging is sent to the two-roll mill for pre-rolling with a reduction of 8% in the second pass to obtain the billet after pre-rolling;

[0074] Step 3: Rolling under heavy pressure

...

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Abstract

The invention relates to a method for improving rolling forming of a magnesium alloy sheet strip, and belongs to the field of plastic processing of non-ferrous metal materials. The method for improving rolling forming of the magnesium alloy sheet strip comprises the steps that a magnesium alloy billet is subjected to pre-rolling cogging through a chill roll or a hot roll, and a pre-rolled billet is obtained, specifically, the pre-rolling reduction is 2% to 15%; the pre-rolled billet is subjected to high reduction rolling, and a magnesium alloy sheet strip is obtained, specifically, the reduction of high reduction rolling is 75% to 85%; and before pre-rolling or after pre-rolling, continuous rapid side forging is further adopted, specifically, the reduction of continuous rapid side forgingis 5% to 20%. According to the method, the pre-rolling high reduction cogging method or a method of alternate continuous rapid side forging and pre-rolling and subsequent high reduction cogging is adopted for improving the rolling formability of the magnesium alloy sheet strip, edge cracking is suppressed, the texture of a sheet is improved and accurately controlled, the structure uniformity is improved, and the structure is optimized.

Description

technical field [0001] The invention belongs to the field of plastic processing of non-ferrous metal materials, and in particular relates to a method for improving the rolling forming of magnesium alloy plates and strips. Background technique [0002] Edge cracks are the most obvious edge defects in the rolling process of magnesium alloy sheets, and the depth of cracks directly determines the amount of edge trimming in the subsequent finishing process and the yield of the final sheet. From the temperature point of view, the sudden drop in temperature at the edge of the rolled plate during the deformation process will lead to a sharp drop in the plastic forming ability of the magnesium alloy and induce crack initiation at the edge. The difference in transverse temperature plays a leading role in the crack propagation along the transverse direction. From the perspective of deformation, due to having more free ends, the edge metal is less constrained, resulting in differences ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/22B21J5/02B21C37/02B21B37/74
Inventor 乐启炽宁方坤贾伟涛李莹宝磊王彤
Owner NORTHEASTERN UNIV LIAONING
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