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Strong impulse current auxiliary copious cooling different speed asynchronous rolling device and method for preparing ultra-fine grain metal strip
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A technology of strong pulse current and metal strip, which is used in the driving device of metal rolling mill, metal rolling, metal rolling, etc., can solve the problems of inability to use plate and strip products, easy cracks on the edge of the rolling piece, etc.
Inactive Publication Date: 2019-01-11
CENT SOUTH UNIV
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Neither of the above two methods can be used to prepare strip products
The cumulative stack rolling method is suitable for the preparation of strip products, but the main disadvantage is that cracks are prone to appear on the edge of the rolled piece, and it requires surface treatment of the rolled piece
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Embodiment 1
[0044] Preparation of ultra-fine grain aluminum alloy AA5083 strip by intensive pulse current cryogenic all-speed asynchronous rolling, refer to figure 1 ,Proceed as follows:
[0045] Step 1: The metal strip 3 is an aluminum alloy AA5083 strip with a width of 300mm and a thickness of 1.2mm before rolling.
[0046] Step 2: Put the metal strip 3 on the crimping device 2 of the left cryogenic box, open the gap between two work rolls, and place one end of the metal strip 3 on the crimping device 17 of the right cryogenic box.
[0047] Step 3: Turn on the cryogenic box 1 on the left, use nitrogen gas for cooling, and control the cooling time according to the amount of strip material, so that the metal strip 3 is evenly cooled to -170°C.
[0048] Step 4: Turn on the cryogenic box 18 on the right, and the temperature is -170°C.
[0049] Step 5: Turn on all the nitrogen nozzles and set the temperature of the nitrogen to -160°C.
[0050] Step 6: Turn on the strong pulse current powe...
Embodiment 2
[0055] Preparation of ultra-fine grain T3 copper strip by intensive pulse current cryogenic all-speed asynchronous rolling, refer to figure 1 ,Proceed as follows:
[0056] Step 1: The metal strip 3 is a T3 copper strip with a width of 200 mm and a thickness of 1.0 mm before rolling.
[0057] Second step: put the metal strip 3 on the crimping device 2 of the left cryogenic box, open the two work roll gaps, and place one end of the metal strip 3 on the crimping device 17 of the right cryogenic box.
[0058] Step 3: Turn on the cryogenic box 1 on the left, use nitrogen gas for cooling, and control the cooling time according to the amount of strip material, so that the metal strip 3 is evenly cooled to -180°C.
[0059] Step 4: Turn on the cryogenic box 18 on the right, and the temperature is -180°C.
[0060] Step 5: Turn on all the nitrogen nozzles and set the temperature of the nitrogen to -160°C.
[0061] Step 6: Turn on the strong pulse current power supply 6 with a current ...
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Abstract
A strong impulse current auxiliary copious cooling different speed asynchronous rolling device for preparing an ultra-fine grainmetal strip comprises a left side copious cooling box and a right sidecopious cooling box; a left side metal crimping device is arranged in the left side copious cooling box; a right side metal crimping device is arranged in the right side copious cooling box; the two ends of a to-be-rolled metal strip are arranged on the left side metal crimping device and the right side metal crimping device correspondingly; an upper work roller and a lower work roller used for rolling the metal strip are arranged above and the below the middle position of the metal strip correspondingly; a left side conductive roller and a right side conductive roller connected with a strongpulse current power source are correspondingly arranged on the two sides of the upper work roller and the lower work roller; the left side conductive roller and the right side conductive roller act onthe metal strip, and apply a strong pulse current on the metal strip; and the upper work roller and the lower work roller are different in rotating speed. The invention further provides a corresponding strong impulse current auxiliary copious cooling different speed asynchronous rolling method, the method is suitable for preparing a large-size ultra-fine grain high-performance strip, it can be avoided that cracks occur on the edge portion of a rolled piece, and important using prospects are achieved.
Description
technical field [0001] The invention belongs to the technical field of ultra-fine-grained metal materials, and in particular relates to a strong pulse current-assisted cryogenic all-speed asynchronous rolling device and method for preparing ultra-fine-grained metal strips. Background technique [0002] Ultrafine-grained metal materials have attracted extensive attention from engineers and researchers due to their excellent mechanical properties, good corrosion resistance and fatigue resistance. A large number of large plastic deformation methods have been developed to prepare ultrafine-grained metallic materials. Such as equal channel extrusion method, high pressure torsion, cumulative stack rolling and other methods. The equal channel extrusion method is suitable for the preparation of rods, and the high pressure torsion method is suitable for the preparation of small samples. Neither of the above two methods can be used to prepare strip products. The accumulative stack ...
Claims
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