JPH02149628A - Aluminum alloy for heating roll - Google Patents

Abstract

PURPOSE:To obtain an Al alloy material which is lightweight and non-magnetic, having excellent heat resistance and suitable to a heating roll for toner fixing in a copying machine by adding specific elements to Al and alloying them. CONSTITUTION:To an Al alloy contg., by weight, 1.0 to 5.0% Mn and 0.1 to 2.0% Mg, if necessary, 0.01 to 0.5% Zr or one or more kinds among 0.3 to 1.2% Cu, 0.01 to 2.0% Ni, 0.01 to 0.5% Si, 0.01 to 0.5% Cr, 0.01 to 0.5% Zn, 0.01 to 0.1% V, 0.01 to 1.0% Fe and 0.001 to 0.1% Ti are furthermore incorporated independently or compoundedly. The Al alloy is subjected to the process of casting, extruding and drawing to work into a heating roll. Since the alloy has excellent cold workability, particularly excellent drawability and easy to form into a heating roll, a heating roll can be manufactured at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an aluminum alloy as a material for a heat roller used for fixing toner in a copying machine or the like.

BACKGROUND OF THE INVENTION Due to the conditions of use, the materials for the heat roller described above are required to be lightweight, non-magnetic, and have excellent heat resistance.

Therefore, the material for this heat roller has conventionally been aluminum alloy, especially JIS A, which has relatively high high temperature strength.
30523052 alloy and 563056 alloy were included.

Problems to be Solved by the Invention Incidentally, the heat roller described above is generally manufactured by extruding it into a pipe shape, but since the extrudability of the 5052 alloy and 5056 alloy is generally poor, it is easy to operate and inexpensive. However, it is difficult to extrude using an inexpensive boathole die, and mandrel extrusion, which is complicated and costly, has to be used, which has the drawback of increasing product cost. In addition, for reasons such as improving surface precision, drawing is generally performed after extrusion to obtain the final dimensions, but conventional aluminum alloys have poor cold workability, especially drawing workability. There was also the problem that cracks were likely to occur on the surface during the drawing process. Furthermore, when stress is applied during heating use as a heat roller, there is a problem that bending is likely to occur due to plastic deformation.

This invention solves these problems and enables porthole extrusion by improving extrusion workability, improves cold workability, especially drawing workability, and improves bending resistance during heating use. The purpose of the present invention is to provide an aluminum alloy for heat rollers that is designed to be used in a heat roller.

Means for Solving the Problems In the above object, the aluminum alloy for heat rollers according to the present invention has Mn: 1.0 to 5.0%, Mg
: 0.1 to 2,0 νt%, or further Z r :
0.01~0. 5wL% and/or Cu: 0.
3-1. 2vt%, Ni: 0°01~2.0wt%
, S i : 0. 01~0. 5wL%, Cr:
0. 01~0. 5wt%, Zn: 0°01~0.
5wt%, V: 0. 01-0.1wt%, Fe
: 0. 01-1. 0wt%, Ti: 0.001
It is characterized by containing up to 0.1 wt% of one or more types, with the remainder consisting of aluminum and unavoidable impurities.

First, the significance of adding each element and the reason for its limitation will be explained.Mn plays a role in improving bending resistance. However, if the content is less than 1.0 wt%, the above effects are poor, and conversely, 5. If it exceeds 0 wt%, extrusion processability deteriorates, making extrusion processing difficult. Therefore, the Mn content is 1
, 0 to 5°, and 0 wt%. Particularly preferably 1.2 to 3. It is preferable to set it in the range of 0 wt%.

Mg contributes to improving the strength of the alloy through solid solution strengthening, but 0
．． If it is less than 1vt%, there is no effect, and if it exceeds 2.0vt%, extrusion processability deteriorates and porthole extrusion becomes difficult. Therefore, the Mg content is between 0.1 and 2. Must be 0wt%.

Particularly preferably 0.3 to 1. The content is preferably in the range of 5 wt%.

Zr, which is allowed to be included as an optional element, increases the recrystallization temperature of the alloy and has the effect of improving heat resistance. But 0
．． If it is less than 0.01vt%, the effect will be poor; 5wt
If it exceeds %, bulky products will be produced and processability will deteriorate. Therefore, the Zr content must be 0.01 to 0.5 wt%. Particularly preferably 0.05 to 0. 3w
It is preferable to set it in the range of t%.

Furthermore, Cu, Ni, Si, C'', Zn s, which are allowed to be included as optional elements in the pond, regardless of the presence or absence of Z''.
Both V SF e s T i contribute to improving the mechanical properties of the alloy, and both are evaluated as equivalent in terms of such effects. More specifically, Cu particularly contributes to improving heat resistance strength, but 0. 3w
If it is less than t%, there is no effect of addition, and if it exceeds 1.2vt%, extrudability deteriorates. Therefore, the Cu content must be in the range of 0.3 to 1.2 vL%. Ni particularly contributes to improving machinability, but if it is less than 0.01 vt%, it has no effect; 2. Even if it exceeds 0 wt%, no particular increase in the effect can be expected. Therefore, the Ni content is 0.01
~2. Must be in the range of 0wt% o S
is Cr % Z n % V % Fe5Ti particularly contributes to improving the strength, but Si, Cr, Z
All of n, V, and Fe are less than 0.01 wt%, and T
If i is less than 0.001wt%, there is no effect;
iSCr.

Either Zn is 0. more than 5wt%, or V,
Either Ti is 0. Exceeding 1wt% or Fe
is 1. If it exceeds 0wt96, oversized items will be produced.

Therefore, each content is Si: 0.01~0.5wt%, C
r: 0.01~0.5wt%, Zn: 0°01~0.
5wt%, V: 0.01-0.1vt%, Fe: 0.0
1-1. OvL%, Ti: 0.001-0. 1wL%
must be within the range of

In addition to the above, for the purpose of improving the machinability of the alloy, Pb: 0. 1-1. 0wt%, Bi
:0.1~1. 0wt%, Sn: 0.1-1.0w
You may contain one or more kinds of t%.

The above-mentioned alloy is manufactured into a desired heat roller by sequentially carrying out melting and casting steps, extrusion steps, and drawing steps according to conventional methods. Here, it is preferable to use porthole extrusion as the extrusion in order to enjoy the advantages of the present invention, but the extrusion is not limited thereto.

Example Next, examples of the present invention will be shown in comparison with comparative examples.

[Alloys with various compositions shown in Table 1 below were cast into billets with a diameter of 6 inches according to a conventional method, and then extruded using a porthole die to examine their extrudability. Extrusion processability was evaluated by whether extrusion was possible when extruded at a temperature of 500° C. into a pipe shape with an outer diameter of 30 # and a wall thickness of 3 trm.

Next, for alloys Nos. 1 to 21, the extruded pipes obtained above were used, and alloys Nos. 22 (A5052 alloy) and 2
For 3 (A 5056 alloy), extruded vibrators of the same shape separately obtained by mandrel extrusion were drawn out at a reduction rate of 20% using the same drawing die to form heat rollers, and cracks occurred on the surface after drawing. I looked into it.

Next, the bending resistance of each of the heat rollers obtained above was examined. The bending resistance is determined by coating the surface of each heat roller with Teflon (trade name) or silicone, and then applying 40 Kl to both ends with the center of the length as the fulcrum.
The evaluation was made based on the amount of bending when a load of f was applied and this state was maintained at 200° C. for 200 hours.

The above results are shown in Table 2 below.

[Left below] (Note 1) (Note 2) (Note 3) O... Porthole extrusion possible X... Porthole extrusion not possible O... No cracks on the surface ×... Cracks on the surface ○・...The amount of bending is less than 0.1 mm ×...The amount of bending is 0.1 mm or more As can be seen from the results in Table 2, the aluminum alloy according to the present invention has excellent extrudability and can be extruded using a porthole die. In addition, no cracks were observed on the surface after drawing, and it was confirmed that there was less bending after heating under load than in conventional alloys.

As described in detail of the invention, the aluminum alloy for heat rollers according to the present invention can improve extrudability compared to the conventional A30523052 alloy 6 alloy by specifying the specific composition and the content of each element. As a result, not only mandrel extrusion but also easy-to-operate and inexpensive porthole extrusion becomes possible, and the cost of the heat roller can be reduced. Furthermore, it has excellent cold workability, particularly drawing property, and can prevent the occurrence of surface cracks after drawing. Furthermore, it is possible to improve the bending resistance against the load during heating use, and it becomes possible to provide a heat roller with a long life that does not deteriorate in quality even after repeated use.

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Claims (4)

[Claims] (1) Mn: 1.0-5.0wt%, Mg: 0.1-2
．． An aluminum alloy for a heat roller, characterized in that the aluminum alloy contains 0 wt%, and the remainder consists of aluminum and unavoidable impurities. (2) Mn: 1.0-5.0wt%, Mg: 0.1-2
．． 0 wt%, Zr: 0.01 to 0.5 wt%,
An aluminum alloy for heat rollers, characterized in that the remainder consists of aluminum and unavoidable impurities. (3) Mn: 1.0-5.0wt%, Mg: 0.1-2
．． Contains 0 wt%, and further contains Cu: 0.3 to 1.2 wt.
%, Ni: 0.01~2.0wt%, Si: 0.01~
0.5wt%, Cr: 0.01-0.5wt%, Zn:
0.01-0.5wt%, V: 0.01-0.1wt%
, Fe: 0.01~1.0wt%, Ti: 0.0.1~
An aluminum alloy for a heat roller, characterized in that it contains 0.1 wt% of one or more kinds, and the remainder consists of aluminum and unavoidable impurities. (4) Mn: 1.0-5.0wt%, Mg: 0.1-2
．． 0 wt%, Zr: 0.01 to 0.5 wt%,
Furthermore, Cu: 0.3 to 1.2 wt%, Ni: 0.01 to
2.0wt%, Si: 0.01-0.5wt%, Cr:
0.01-0.5wt%, Zn: 0.01-0.5wt
%, V: 0.01-0.1wt%, Fe: 0.01-1
．． An aluminum alloy for a heat roller, characterized in that it contains one or more of Ti: 0.001 to 0.1 wt%, and the remainder consists of aluminum and unavoidable impurities.