Magnesium hot rolling method and apparatus

Abstract

A magnesium alloy hot rolling method includes: a first rolling step in which a magnesium plate (M0, M1) is rolled reciprocatingly between an upstream heating furnace (2) which is located on an upstream side of a rolling mill (1) and which heats the magnesium plate (M0, M1), and a upstream heating furnace (3) which is located on a downstream side of the rolling mill (1) and which heats the magnesium plate (M0, M1); and a second rolling step in which the temperature of respective end portions of the magnesium plate (M0, M1) on both the upstream and downstream sides is maintained while the magnesium plate (M0, M1) is being rolled reciprocatingly between an upstream temperature maintaining apparatus (5) which transports the heated magnesium plate (M0, M1) while maintaining the temperature thereof, and a downstream temperature maintaining apparatus (6) which transports the heated magnesium plate (M0, M1) while maintaining the temperature thereof. According to the magnesium hot rolling apparatus of the present invention and to the magnesium hot rolling method of the present invention which uses this apparatus, it is possible to prevent any deterioration in the quality of a product which is due to temperature variations during the hot rolling of magnesium alloy.

Description

TECHNICAL FIELD

[0001] The present invention relates to a magnesium hot rolling method and to a magnesium hot rolling apparatus.

[0002] Priority is claimed on Japanese Patent Application No. 2007-269058, filed Oct. 16, 2007, the contents of which are incorporated herein by reference.TECHNICAL BACKGROUND

[0003] To manufacture a magnesium sheet from magnesium alloy, a round bar-shaped billet having, for example, a diameter of approximately 300 to 400 mm and a length of approximately 500 to 600 mm is molded by hot extrusion molding into a thick plate having a thickness of, for example, 10 mm or less. This thick plate is then cut to a predetermined length (for example, 3 m) so as to form a cut plate material, and this cut plate material is then rolled to a thickness of not more than 1 mm by rough rolling.

[0004] In order to roll magnesium alloy at room temperature a large amount of pressure is required. However, even if a large amount of pressure is applied, it still cracks easily. Accordingly,...

Examples

Embodiment Construction

[0032]An embodiment of the present invention will now be described with reference made to the drawings.

[0033]FIG. 1 is a schematic front view showing the schematic structure of a hot rolling apparatus 100 (i.e., a magnesium alloy hot rolling apparatus) in the present embodiment.

[0034]As is shown in FIG. 1, the hot rolling apparatus 100 according to the present embodiment is provided with a rolling mill 1, a first heating furnace 2, a second heating furnace 3, pinch rollers 4, a first table roller 5, a second table roller 6, a winder 7, and pinch rollers 8.

[0035]The rolling mill 1 has a pair of working rollers 1a that are in parallel with each other and also face each other, and with a drive source (not shown) which drives the working rollers 1a to rotate.

[0036]The working rollers 1a are heating rollers whose surface temperature is raised to a suitable temperature and which, while feeding a magnesium cut plate material M0 (i.e., a magnesium plate) which is passing between the working...

TECHNICAL FIELD

[0001] The present invention relates to a magnesium hot rolling method and to a magnesium hot rolling apparatus.

[0002] Priority is claimed on Japanese Patent Application No. 2007-269058, filed Oct. 16, 2007, the contents of which are incorporated herein by reference.TECHNICAL BACKGROUND

[0003] To manufacture a magnesium sheet from magnesium alloy, a round bar-shaped billet having, for example, a diameter of approximately 300 to 400 mm and a length of approximately 500 to 600 mm is molded by hot extrusion molding into a thick plate having a thickness of, for example, 10 mm or less. This thick plate is then cut to a predetermined length (for example, 3 m) so as to form a cut plate material, and this cut plate material is then rolled to a thickness of not more than 1 mm by rough rolling.

[0004] In order to roll magnesium alloy at room temperature a large amount of pressure is required. However, even if a large amount of pressure is applied, it still cracks easily. Accordingly,...

Examples

Embodiment Construction

[0032]An embodiment of the present invention will now be described with reference made to the drawings.

[0033]FIG. 1 is a schematic front view showing the schematic structure of a hot rolling apparatus 100 (i.e., a magnesium alloy hot rolling apparatus) in the present embodiment.

[0034]As is shown in FIG. 1, the hot rolling apparatus 100 according to the present embodiment is provided with a rolling mill 1, a first heating furnace 2, a second heating furnace 3, pinch rollers 4, a first table roller 5, a second table roller 6, a winder 7, and pinch rollers 8.

[0035]The rolling mill 1 has a pair of working rollers 1a that are in parallel with each other and also face each other, and with a drive source (not shown) which drives the working rollers 1a to rotate.

[0036]The working rollers 1a are heating rollers whose surface temperature is raised to a suitable temperature and which, while feeding a magnesium cut plate material M0 (i.e., a magnesium plate) which is passing between the working...

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