JPS6137336A - Working method of pipe roll - Google Patents

Abstract

PURPOSE:To work integrally a thick-walled pipe roll which is hardly workable by machining both ends of the pipe material having the wall thickness and outside diameter conforming to the wall thickness and outside diameter of the pipe roll to a small diameter and pressurizing the small diameter parts to required inside and outside diameters. CONSTITUTION:The two ends of the thick-walled pipe 4 having an inside diameter d1, outside diameter d2 and overall length l1 are machined in the range B of the length l3 to have an outside diameter d3. The thin-walled parts at both ends are then drawn to a shaft diameter d4. The range to be drawn to the diameter d4 is not required to be drawn over the entire length of the thin-walled part l3 and may be only the range required for attaching of a bearing 5. If the inside diameter of the bearing 6 is equal to the outside diameter d5 lager than the machined outside diameter d3, a die 7 is manufactured and the work piece machined to the size A is fitted to said die. A high-pressure working fluid is forced into the hollow part of the diameter d1 to bulge the thin-wall part at the end until said part conforms to the inside surface of the die, by which the shaft part having the diameter d5 of obtd. The material 4 or the ambient is heated to facilitate working with some materials.

Description

[Detailed description of the invention] Technical field The present invention relates to a method for processing thick-walled pipe rolls.

U1 digit For example, a fixing roll used in a heat roll fixing device for fixing a toner image transferred to a transfer paper in an electrophotographic copying machine has a tubular heater built in the center and is heated to a predetermined position. The toner image is fused to the transfer paper by heating the transfer paper to a temperature of 10.degree. Therefore, as the fixing roll of the heat roll fixing device, a pipe roll having a shape of a thick-walled cylinder connected to both ends with a shaft portion of an appropriate outer diameter is used.

Conventionally, pipe rolls with this shape are produced by swaging the ends of a pipe with a uniform outer diameter and thickness to reduce the outer diameter, or conversely by expanding the roll body by bulging, as shown in Figure 5. Previously, the main body and shaft support were pressed together (heated if necessary).
This method of forming pipes is difficult to process unless it is a thin-walled pipe. Therefore, for rolls with a thick wall that are difficult to process using this method, as shown in FIG. Rolls made by this method had the disadvantage that the adhesive part was weak and the shaft part 3 was easily separated from the main body part 2, and the processing was time-consuming. .

OBJECTS The present invention aims to provide a simple and reliable pipe roll processing method that eliminates the above-mentioned drawbacks of the conventional pipe roll processing methods, and is particularly effective for processing thick-walled pipe rolls.

In order to achieve the above-mentioned object, the pipe roll processing method according to the present invention first involves cutting the outer diameter of both ends of a pipe material having a wall thickness and an outer diameter corresponding to the main body part to a small diameter by mechanical cutting. Next, the thinned portion is pressurized or heated and pressurized to give the desired inner and outer diameters.

The processing method of the present invention will be explained in detail below with reference to the drawings.

Inner diameter d1, outer diameter d2, total length 11 as shown by the solid line in Figure 1
The range of length 13 at both ends of the thick-walled pipe 4 is machined by lathe processing or the like, and the part B indicated by the broken line hatching in the figure is shaved off, leaving only the part A, and the length 43 at both ends is removed.
Let d3 be the outer diameter of the range. 1 at both ends from the total length f11
The remaining length of J22 after subtracting the length of J22 corresponds to the length of the roll body.

Next, as shown in FIG. 2, the thin-walled portions at both ends of the portion A are drawn to a required shaft diameter d4. outer diameter d
The range of 4 does not need to be 3 in the entire length of the thin wall portion, and only the range necessary for mounting the bearing 5 is sufficient.

As shown in FIG. 3, when the inner diameter of the bearing 6 is d5, which is larger than the outer diameter d3 of the end formed by cutting,
A mold 7 having a cross-sectional shape as shown by the hatching in FIG. 4 is prepared in advance, and a workpiece cut into the shape A shown in FIG. When high-pressure hydraulic oil is pumped, the thin end portion bulges out along the inner surface of the mold, making it possible to obtain a desired shaft portion with an outer diameter d5.

d1 = 40rtrn, d2 = 80 with the sign in Figure 1
Using an aluminum pipe with rrafflt=400+++m, both ends J23=50+nm were cut to have an outer diameter d3=50nwn. The length J22 of the portion that becomes the roll body is 300 fields.

The end of such a machined workpiece A is narrowed down by swaging processing, and the outer diameter d4 of the part where the bearing is attached is
(Figure 2) was set to 40 elbows.

Combining this roll with a processing roll produces 5 kg/c♂
It was operated for 1,000 hours under the above pressure, but no problems occurred.

On the other hand, when a roll of the same size manufactured using the method shown in FIG. 6 was tested using the same method, the adhesive part peeled off after 30 hours.

In the above example, the cold swaging process was performed and no problems occurred, but the dimensions of the thinned part of the roll,
Depending on the material, it may also be necessary to heat the pipe material or its surroundings to facilitate processing.

As described above, according to the present invention, pipe rolls, especially thick-walled pipes that are difficult to process reliably using normal methods, can be used for pipe rolls, especially thick-walled pipes that are difficult to process reliably using conventional methods. 1. This processing method is suitable for mass production and is effective in reducing costs.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram for explaining the first step of the method according to the embodiment of the present invention, Fig. 2 is a sectional view showing a completed state of an example in which both ends are reduced in diameter, and Fig. 3 is an enlarged view of both ends. 4 is a schematic diagram illustrating the processing method, FIG. 5 is a schematic diagram illustrating an example of the conventional processing method, and FIG. 6 is a diagram illustrating another conventional processing method. FIG. 3 is a cross-sectional view of a roll according to a processing method. 4... Pipe material (material) 5.6... Bearing dl... Inner diameter of roll body part d2... Outer diameter of roll body part d3... Outer diameter of both ends in the cut state d, s ,d
5... Required outer diameter of both ends Fig. 1 Fig. 2 Fig. 5 Fig. 6

Claims (1)

[Claims] In a method for processing a pipe roll having a thin-walled cylindrical shaft portion at both ends of a thick-walled cylindrical main body portion, at least a portion of which has an inner and outer diameter different from that of the main body portion, first, the pipe roll has a wall thickness and an outer diameter corresponding to the main body portion. A processing method characterized by reducing the outer diameter of both ends of a pipe material by mechanical cutting, and then applying pressure or heating and pressurizing the thinned portion to the required inner and outer diameters.