JPH0477063B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD This invention relates to a heat roller used for fixing toner in a copying machine or the like, and particularly to a heat roller with excellent heat resistance. BACKGROUND OF THE INVENTION Heat rollers used in copying machines and the like are required to be lightweight and non-magnetic, as well as to have excellent heat resistance so as not to warp in high-temperature conditions. Conventionally, heat rollers made of aluminum alloys, particularly JIS5052 alloys and 5056 alloys, have been used. Problems to be Solved by the Invention Incidentally, the heat roller described above is generally manufactured by extrusion, but since the extrudability of the 5052 alloy and 5056 alloy described above is generally poor, extrusion is used to obtain the final dimensions of the heat roller. After that, drawing and annealing are repeated to gradually reduce the outer diameter and wall thickness, which causes high costs. This invention was made in order to solve these drawbacks, and its purpose is to provide a heat roller that has heat resistance equal to or higher than that of 5052 alloy or 5056 alloy, and also has excellent extrudability in the manufacturing process. It is something to do. Means for Solving the Problems Therefore, this invention contains Ni: 3 to 8 wt%,
Furthermore, Zr: 0.05~0.5wt%, Mn: 0.05~3wt%,
Contains one or more of Cr: 0.05 to 0.5 wt%, or further Fe: 0.05 to 3 wt%, Cu:
0.05-1.5wt%, Mg: one or more of 0.05-1.5wt% and/or Ti: 0.005-0.5wt%,
B: A heat with excellent heat resistance characterized by being formed from an extruded aluminum alloy containing one or two of 0.001 to 0.1 wt%, with the remainder consisting of aluminum and unavoidable impurities. Roller is the gist. The heat roller according to the present invention is made of aluminum alloy because of its lightweight and non-magnetic properties. To explain the composition of this aluminum alloy and the significance of adding each element, Ni contributes to improving the heat resistance of the alloy. That is, it contributes to improving heat resistance through the dispersion strengthening effect of finely formed Al ₃ Ni particles in the alloy structure. However, if the content is less than 3wt%, the effect is insufficient, and on the other hand, if the content exceeds 8wt%, primary crystallization will occur.
This results in the disadvantage that the Ni content increases and the extrudability decreases. The preferred Ni content range is 3 to 5 wt%. Zr, Mn, and Cr are all elements that are effective in suppressing recrystallization and, in turn, contribute to improving heat resistance. These are equivalent in terms of such action, and it is sufficient if at least one type is contained. However, if each is less than 0.05wt%, this effect is poor;
If Zr or Cr is contained in excess of 0.5 wt% or Mn is contained in excess of 3 wt%, a disadvantage arises in that extrudability is reduced. Furthermore, as optional components, Fe: 0.05 to 3wt%, Cu:
The content of one or more of Mg: 0.05 to 1.5 wt% and Mg: 0.05 to 1.5 wt% is allowed. These elements are effective in improving the heat resistance of the heat roller. Although the heat resistance improvement effect contributed by Fe is not large, up to 3wt% is allowed. 3wt
If the content exceeds %, the extrudability will be reduced. Further, although the addition of Cu and Mg causes a decrease in extrudability, they may be contained within the above range in order to further improve the heat resistance of the heat roller. Further, Ti and B, which are optionally allowed to be included at least one of them, contribute to grain refinement during casting of the aluminum alloy, and both are equivalent in terms of this effect. However, Ti is 0.005wt
If B is less than 0.001wt%, the above effects will be poor. On the other hand, even if Ti exceeds 0.5 wt% and B exceeds 0.1 wt%, the refinement effect is saturated and it is useless. Effects of the Invention The heat roller according to the present invention limits the amount of Ni to a specific range, and is made of an aluminum alloy containing one or more of Zr, Mn, and Cr in a predetermined range. As is clear from consideration of the examples of
It has heat resistance equal to or higher than those made of 5052 alloy and 5056 alloy, and has extremely excellent extrudability during the manufacturing process. Therefore, it not only fully satisfies the properties as a heat roller, but also enables hollow extrusion of the raw tube for the heat roller at the manufacturing stage of the heat roller, which eliminates the trouble of repeating drawing and annealing after extrusion as in the past. This makes it possible to avoid problems, improve productivity, and significantly reduce costs. Furthermore, when one or more of Fe, Cu, and Mg are further contained within a predetermined range, there is an effect of further improving heat resistance. Furthermore, when one or both of Ti and B are contained within a predetermined range, in addition to the above-mentioned effects, the crystal grain refinement effect during casting can be exhibited. Examples Next, examples of the present invention will be described in comparison with comparative examples. As shown in Table 1 below, aluminum alloys (sample Nos. 1, 3, 5 to 13) forming the heat roller according to the present invention with various compositions were prepared, and an Al-Ni alloy was prepared as a comparison alloy. (Sample No. 2,
4), JIS3003 alloy (sample No. 14), 5052 alloy (sample
No. 15) and 5056 alloy (sample No. 16) were prepared.

[Table] Each alloy was then cast into billets 3 inches in diameter. After that, the billet was heated to 450℃ to a thickness of 5 mm
The extrudability of each material was examined by extruding it into a plate shape with a width of 30 mm. Extrudability is comprehensively evaluated taking into account deformation resistance and extrusion speed during extrusion, and the extrudability of JIS3003 alloy is 100%.
This is a relative comparison. Thereafter, each of the above extruded materials was cold rolled to a thickness of 4 mm. The heat resistance of the obtained material was then investigated. Heat resistance is 250℃ x 2 hours and 400℃ for each material.
After annealing for 2 hours at ℃, evaluation was made based on the Vickers (Hv) hardness. The results of the investigation on heat resistance and extrudability are shown in Table 2.

【table】

[Table] As is clear from the results in Table 2 above, the aluminum alloy forming the heat roller according to the present invention is equivalent to or superior to the conventional 5052 alloy (sample No. 15) and 5056 alloy (sample No. 16). It can be seen that it not only has the above heat resistance but also extremely excellent extrudability. In addition, samples No. 1 and 2,
From the comparison of 3 and 4, one or two of Zr, Mn, Cr
It can be seen that by containing more than one species, heat resistance can be improved to various degrees while maintaining good extrudability. Therefore, it was naturally expected that the heat roller according to the present invention would have heat resistance equal to or higher than that of the conventional heat roller, and would be easily extruded.

Claims (1)

[Claims] 1 Contains Ni: 3 to 8 wt%, and further Zr: 0.05 to 8 wt%.
0.5wt%, Mn: 0.05~3wt%, Cr: 0.05~0.5wt%
A heat roller having excellent heat resistance, characterized in that it is formed from an extruded material of an aluminum alloy containing one or more of the above, the remainder being aluminum and unavoidable impurities. 2 Contains Ni: 3~8wt%, and further contains Zr: 0.05~
0.5wt%, Mn: 0.05~3wt%, Cr: 0.05~0.5wt%
One or more of the following and Fe: 0.05 to 3wt
%, Cu: 0.05 to 1.5 wt%, Mg: 0.05 to 1.5 wt%, and the remainder is aluminum and inevitable impurities. A heat roller with excellent heat resistance. 3 Contains Ni: 3~8wt%, and further contains Zr: 0.05~
0.5wt%, Mn: 0.05~3wt%, Cr: 0.05~0.5wt%
One or more of the following and Ti: 0.005~
0.5 wt%, B: 0.001 to 0.1 wt%, and the remainder is aluminum and inevitable impurities. Excellent heat roller. 4 Contains Ni: 3~8wt%, and further contains Zr: 0.05~
0.5wt%, Mn: 0.05~3wt%, Cr: 0.05~0.5wt%
One or more of the following and Fe: 0.05 to 3wt
%, Cu: 0.05~1.5wt%, Mg: 0.05~1.5wt%, one or more types, and Ti: 0.005~0.5wt
%, B: 0.001 to 0.1 wt%, and the remainder is aluminum and inevitable impurities. heated roller.