JPH0141440B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a roller, and in particular, a rotating shaft portion made of a metal material with a relatively high melting point is attached to both ends of a right cylindrical portion made of a metal material with a relatively low melting point. The present invention relates to rollers that are fixed to each other by pressure contact.

[Conventional technology]

A conventional roller, such as a fixing heat roller in an electrostatic copying machine, is constructed by fixing a rotating shaft made of stainless steel to both ends of a right cylindrical part made of aluminum by friction welding. That is, referring to FIG. 1, a recess 4 is formed in an end surface 3 of the rotating shaft portion 1 corresponding to the right cylindrical portion 2 . In friction welding, the right cylindrical part 2 is pressed against the rotating shaft part 1 while rotating the rotating shaft part 1. As a result, the end surface 3 and the end surface 5 of the right cylindrical portion 2 become high in temperature due to friction welding, and the end of the right cylindrical portion 2 made of aluminum, which has a relatively low melting point, melts, and a part of it melts into the second As shown in the figure, by being fitted into the recess 4, the rotating shaft portion 1 and the right cylindrical portion 2 are integrally joined. Next, the portion 6 protruding from the outer circumferential surface at the end of the right cylindrical portion 2 is cut off as shown in FIG. 3 to produce a fixing heat roller.

In such a conventional fixing heat roller, the rotating shaft portion 1 easily comes off along the axis of the right cylindrical portion 2. Therefore, in order to increase the strength by increasing the joint portion between the right cylindrical portion 2 and the rotating shaft portion 1, the thickness of the right cylindrical portion 2 inevitably becomes large. Therefore, the rate of temperature increase on the outer surface of the fixing heat roller is slow.

Another conventional example is Japanese Patent Application Laid-Open No. 49-65965. In this conventional example, the first work piece 1 has a groove 2.
and holes 5, 6, 7, and 8 are formed. When friction welding with the second workpiece 4, the second workpiece becomes plastic and flexible due to frictional heat.
The tip of the first workpiece 1 slips into the workpiece 4,
A configuration is shown in which either the groove 2 or the holes 5 to 8 is filled with the plastic material of the second workpiece 4 to mechanically connect them.

In such a conventional example, since the first work piece 1 is configured to sneak into the second work piece 4 and are fixed to each other, the second work piece 4 has a diameter larger than at least the first work piece 1. In addition, in order to increase the strength of the mechanical connection between the two, it is necessary to make the radial length of the portion where the second workpiece 4 has a larger diameter than the first workpiece 1 relatively large. There is a problem that the work piece 4 cannot be made smaller. Further, in this conventional example, as in the first conventional example described above, burrs were generated due to friction welding, and burr removal work was required after friction welding. In other words, the number of man-hours involved in friction welding was unnecessarily increased.

Furthermore, in this conventional example, the second
There is only a disclosure of a cylindrical object as the workpiece 4, and what is the "right cylindrical part made of a metal material with a relatively low melting point" which is one of the constituent elements of the present invention described in the claims above? The composition is completely different. Therefore, the technical idea of the present invention, including the specific functions and effects described below based on the above-mentioned constituent elements, is not disclosed at all beyond the "retaining" function.

[Problem to be solved by the invention]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned technical problems and to provide a roller whose right cylindrical part has a thin wall thickness and which is firmly connected to a rotating shaft part.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 is a perspective view of one embodiment of the present invention.
The fixing heat roller 10 is constructed by inserting a heating heater 12 into a roller body 11. The roller body 11 has a right cylindrical portion 13 made of a metal material with a relatively low melting point, such as aluminum, and has a metal material at both ends thereof.
The rotating shaft portion 15 is provided with an insertion hole 14 for the heating heater 12 and is made of a metal material having a relatively high melting point, such as stainless steel, and is fixed by friction welding. A coating 16 of fluororesin or the like is applied to the outer peripheral surface of the roller body 11.

FIG. 5 is a sectional view showing the separated state of the right cylindrical portion 13 and the rotating shaft portion 15 before they are frictionally welded.
The wall thickness d1 of the right cylindrical portion 13 is formed thinner than the wall thickness of the conventional right cylindrical portion 2 shown in FIGS. 1 to 3. A guide fitting hole 18 that is inclined radially inward as it moves away from the right cylinder part 13 along the axial direction is provided in the end surface 17 of the rotating shaft part 15 corresponding to the right cylinder part 13 . It is formed around the entire circumference. Open end 1 of this guide fitting hole 18
8a corresponds to the right cylindrical portion 13.

Further, the guide fitting hole 18 is continuous with the open end 18a and the open end 18a, as shown in FIG.
The fitting portion 18b is formed in a tapered shape so as to be inclined radially inward as it moves away from the right cylindrical portion 13. The hole width of the open end 18a is selected to be larger than the hole width of the fitting portion 18b, so that the end portion 13a of the right cylindrical portion 13 can easily enter the guide fitting hole 18.

When friction welding the right cylindrical part 13 and the rotating shaft part 15, the rotating shaft part 15 is rotated at high speed, and the right cylindrical part 13 is rotated in a state substantially aligned with the axis of the rotating shaft part 15. Press it against the shaft portion 15. As a result, the end portion 13a of the right cylindrical portion 13 is fitted into the guide fitting hole 18, but the rotating shaft portion 1
5 and the right cylindrical portion 13, heat generation occurs due to friction, and the end portion 13a is inserted into the guide insertion hole 18 while being deformed. Since the guide fitting hole 18 is inclined radially inward along the axis of the rotating shaft portion 15, the end portion 13a of the right cylindrical portion 13 deforms in accordance with the inclination as shown in FIG. As shown, friction welding is performed. In this manner, with the end portion 13a of the right cylindrical portion 13 fully pushed into the guide fitting hole 18, the rotational drive of the rotary shaft portion 15 is stopped, and the connection of both 13 and 15 is achieved.

As described above, the guide fitting hole 18 is inclined radially inward from the right cylindrical part 13 along the axis of the rotating shaft part 15, so that the rotating shaft part 1
The right cylindrical portion 13 does not easily come off from the cylindrical portion 5 in the axial direction, and the two 13 and 15 are firmly connected. Therefore, even if the wall thickness d1 of the right cylindrical portion 13 is thin, there is no problem in terms of strength. Also, guide insertion hole 1
8 is easy to process because it is processed in one step using a lathe.

When the friction welding is completed, the outer circumferential surface of the rotary shaft section 15 is removed so that it is flush with the outer circumferential surface of the right cylindrical section 13 as shown in FIG. 7, or the outer circumferential surface is left in the state shown in FIG. A coating 16 is applied to the surface to complete the fixing heat roller 10.

In this fixing heat roller 10, since the wall thickness d1 of the right cylindrical portion 13 is small, the amount of aluminum material consumed can be reduced. At the same time, the rate of temperature rise on the outer circumferential surface of the fixing heat roller 10 increases, and the waiting time until the first copy is made in the copying machine becomes shorter.

FIG. 8 is a sectional view of another embodiment of the present invention,
Parts corresponding to the embodiments in FIGS. 4 to 7 are given the same reference numerals. In this embodiment, the rotating shaft portion 15
A guide fitting hole 19 is formed in the end surface 17 of the right cylindrical portion 13 so as to correspond to the right cylindrical portion 13, and extends parallel to the axis and further bends inward in the radial direction as the right cylindrical portion 13 moves away from each other. This embodiment also provides the same effects as the previously described embodiments.

In the embodiment shown in FIG. 8, after the friction welding is completed, the outer circumferential surface of the rotating shaft portion 15 may be cut so as to be flush with the outer circumferential surface of the right cylindrical portion 13 as shown by the broken line.

As another embodiment of the present invention, as shown in FIG. 9, a guide fitting hole 20 may be formed in the end surface 17 of the rotary shaft portion 15 so as to be inclined radially outward as it moves away from the right cylindrical portion 13. .

In each of the above embodiments, explanations have been made in connection with a fixing heat roller of an electrostatic copying machine, but in the present invention, a metal material having a relatively high melting point is attached to both ends of a right cylindrical portion made of a metal material having a relatively low melting point. It can be widely implemented in connection with a roller configured by fixing a rotating shaft portion consisting of a roller by friction welding.

[Effects of the Invention] As described above, according to the present invention, the end of the right cylindrical portion is guided radially inward or outward as it moves away from the right cylindrical portion along the axis on the end face of the rotating shaft portion. A guide fitting hole is formed. That is, the vicinity of the end portion of the right cylindrical portion after being fixed to the rotating shaft portion is deformed into a shape bent radially inward or outward along the shape of the guide insertion hole. Therefore, both are difficult to come off in the axial direction and are firmly connected to each other, so that even if the wall thickness of the right cylindrical portion is thin, the connection strength is high.

Furthermore, since the wall thickness of the right cylindrical portion is selected in accordance with the hole width of the guide fitting hole, the wall thickness of the right cylindrical portion can be made significantly thinner by appropriately selecting the shape of the guide fitting hole. In addition, since the end of the right cylindrical part is inserted into the guide fitting hole, no burrs are generated on the right cylindrical part due to friction welding.Therefore, there is no need to perform deburring work after friction welding, which greatly reduces man-hours. can be reduced to

[Brief explanation of drawings]

1, 2, and 3 are sectional views showing the prior art, FIG. 4 is a perspective view of an embodiment of the present invention, and FIG. 5 is a right cylindrical portion 13 and a rotating shaft portion 15 shown in FIG. FIG. 6 is a cross-sectional view showing a state in which friction welding is completed, FIG. 7 is a cross-sectional view for explaining the processing after friction welding is completed, and FIG. 8 is a cross-sectional view showing another state of the present invention. 9 is a sectional view of another embodiment of the present invention. 10... Heat roller for fixing, 13... Right cylindrical part,
15... Rotating shaft portion, 17... End surface, 18, 19,
20...Guide insertion hole.

Claims (1)

[Claims] 1. A roller configured by fixing rotating shaft parts made of a metal material with a relatively high melting point to both ends of a right cylindrical part made of a metal material with a relatively low melting point by friction welding. A guide fitting hole is formed in the end surface corresponding to the right cylindrical part to guide the end of the right cylindrical part radially inward or outward as it moves away from the right cylindrical part along the axis. The roller is characterized in that the wall thickness of the roller is selected in accordance with the hole width of the guide insertion hole.