JP4493910B2 - Mounting method of end member to hollow shaft member for OA equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for attaching an end member to a hollow shaft member for office automation equipment.
[0002]
[Prior art]
Conventionally, a hollow shaft has been used as a shaft of a rotating part in OA equipment or the like. Usually, end members are attached to the core portions at both ends of the hollow shaft. Regarding the method of attaching the hollow shaft and the end member, the present applicant has already proposed “a method of attaching the end member to the hollow shaft member for OA equipment” (see Patent Document 1). As shown in FIGS. 9 and 10, the groove 23 is formed in the end member 22 having the same diameter as the inner diameter of the hollow shaft 21, and the end member 22 is inserted into the hollow shaft 21. The hollow shaft 21 and the end member 22 are fixed by caulking at three points from the outside of the hollow shaft 21.
[0003]
[Patent Document 1]
JP 2002-257150 A (FIGS. 1 and 2)
[0004]
[Problems to be solved by the invention]
However, the above-described conventional method requires a process of forming the groove 23 in the end member 22 by machining, and there is a problem that the cost increases accordingly. Further, since the groove 23 is crimped at three points from the outside of the hollow shaft 21, the amount of crimping increases when the groove 23 is deep, and the concentricity variation between the hollow shaft 21 and the end member 22 increases after crimping. There was a problem.
Accordingly, an object of the present invention is to propose a method for mounting an end member to a hollow shaft member for OA equipment that eliminates the need for groove processing of the end member and has little variation in concentricity after crimping.
[0005]
[Means for Solving the Problems]
Accordingly, in order to solve the above-mentioned problems, the invention of claim 1 is to insert an end member having an outer diameter equal to the inner diameter of the hollow shaft into the end portion of the hollow shaft and caulk the hollow shaft of the insertion portion from the outside at a plurality of positions. In the method of attaching the end member to the hollow shaft member for office automation equipment for fixing the hollow shaft and the end member, before inserting the end member into the hollow shaft, the insertion portion of the end member to the hollow shaft is spaced at an appropriate interval. Formed in the hollow shaft behind the knurled portion of the end member after the knurling process of the strip or more, the step of press-fitting the knurled end member into the hollow shaft, and press-fitting the end member into the hollow shaft. And a step of caulking the hollow shaft at a plurality of locations from the outside of the streak portion.
Here, at the same time as or before or after the step of knurling the end member, the non-knurled portion adjacent to the knurling position of the end member is radially deformed to be thinner than the original diameter of the end member. It is also possible to provide a rolling process.
Further, the knurling of the end member is preferably a flat knurling.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following FIGS. 1 to 7 show the order of steps in the present invention.
FIG. 1 is an external view of a shaft 1 that is an end member inserted into the hollow shaft of the present invention. The shaft 1 is usually made of steel or stainless steel, and its outer diameter is the same as the inner diameter of the hollow shaft to be inserted. FIG. 2 illustrates that three flat knurling processes 2 to 4 are respectively performed at appropriate intervals on the portion of the shaft 1 inserted into the hollow shaft. 3 shows a cross-sectional view taken along line AA and a cross-sectional view taken along line BB in FIG. Assuming that the diameter of the shaft 1 is a, the mountain diameter of the knurled portion is b, and the valley diameter is c, there is a relationship of b> a and c <a.
[0007]
Next, FIG. 4 shows a state in which the shaft 1 is press-fitted into a hollow shaft 5 made of aluminum having the same inner diameter and outer diameter. In this case, knurl processing 2 to 4 is performed and the ridge diameter b of the knurl portion becomes larger than the inner diameter of the hollow shaft 5, so that a certain force is required for press-fitting. Next, FIG. 5 shows a longitudinal sectional view and a right side view of the state in which the shaft 1 is press-fitted to a predetermined position of the hollow shaft 5. When the shaft 1 is press-fitted into the aluminum hollow shaft 5, striations 6 to 8 are formed by ridges of knurls inside the hollow shaft 5 behind the knurled portions 2 to 4.
[0008]
Next, FIG. 6 shows the longitudinal cross-sectional view and CC sectional view of the state which crimped the hollow shaft 5, FIG. 7 shows the external view of FIG. After the shaft 1 is press-fitted into the hollow shaft 5, the hollow shaft 5 is simultaneously crimped on the outside of the streaks 6 to 8 of the hollow shaft 5 by using six upper and lower six punches using a press machine (not shown). The caulking marks 11A to 11D, 12A to 12D, and 13A to 13D are formed on the outside of the streaks 6 to 8. Since these caulking marks 11A to 13D are caulking the streaks 6 to 8 of the hollow shaft 5 from the outside, the gap between the hollow shaft 5 and the shaft 1 formed in the streaks 6 to 8 is moderate. The caulking amount is obtained, and the strength necessary for the coupling between the hollow shaft 5 and the shaft 1 can be obtained, and the coaxiality between the hollow shaft 5 and the shaft 1 is less varied and the quality is stabilized.
[0009]
FIG. 8 is an explanatory diagram showing a case where the machining of the shaft 1 is performed by rolling. By rotating the rolling die 14 and the rolling die 15 while sandwiching the shaft 1 between the rolling die 14 and the rolling die 15, the outer periphery of the shaft 1 and two knurls are performed. In particular, the rolling dies 14 and 15 form a constricted portion at the outer periphery 3 of the shaft 1 by slightly expanding the outer diameter of the outer portions A and C between the two knurled portions B and between the two knurled portions. Like to do. These constricted portions are caulked after the shaft 1 is press-fitted into the hollow shaft 5, and a gap formed between the constricted portion and the hollow shaft 5 is caulked appropriately. In the present invention, it is preferable to perform knurling with two or three knurls at appropriate intervals, but it is also possible to have one or four or more. Further, the knurl processing may be knurl processing such as a twill pattern other than the flat mesh, but is preferably a flat knurl processing.
[0010]
【The invention's effect】
As described above, according to the present invention, since the outer peripheral portion of the end member inserted into the hollow shaft is knurled and then press-fitted and crimped, the end member is not required to be grooved. The cost is reduced, and the hollow shaft outside the front and rear portions of the knurling position is crimped, so the amount of crimping is smaller than before and the concentricity between the hollow shaft and the end member is reduced accordingly, improving the quality. To do.
[Brief description of the drawings]
FIG. 1 is an external view of a shaft that is an end member inserted into a hollow shaft of the present invention.
FIG. 2 is a diagram showing that the shaft is subjected to a flat knurling process.
3 is a cross-sectional view taken along the line AA and a cross-sectional view taken along the line BB in FIG. 2;
FIG. 4 is a longitudinal sectional view showing a state in which a shaft is press-fitted into a hollow shaft.
FIG. 5 is a longitudinal sectional view and a right side view showing a state in which a shaft is press-fitted into a hollow shaft.
FIGS. 6A and 6B are a longitudinal sectional view and a sectional view taken along the line C-C showing a state where the hollow shaft is crimped. FIGS.
7 shows an external view of FIG. 6. FIG.
FIG. 8 is an explanatory view showing a case where the shaft is processed by rolling.
FIG. 9 is a diagram showing a conventional example.
FIG. 10 is a diagram showing a conventional example.
[Explanation of symbols]
1 Axis 2-4 Knurling 5 Hollow shaft 6-8 Strips 11A-11D, 12A-12D, 13A-13D Caulking traces 14, 15 Rolling dies

Claims (3)

An end member having an outer diameter equal to the inner diameter of the hollow shaft is inserted into the end portion of the hollow shaft, and the hollow shaft in the insertion portion is caulked from a plurality of locations from the outside to fix the hollow shaft and the end member to the hollow shaft member for OA equipment. In the mounting method of the end member,
Before inserting the end member into the hollow shaft, performing a knurling process of two or more strips at an appropriate interval in the insertion portion of the end member made of steel or stainless steel into the hollow shaft;
A process of press-fitting the knurled end member into a hollow shaft made of aluminum ;
After press-fitting the end member into the hollow shaft, a step of crimping the hollow shaft from the outside of the streak portion formed inside the hollow shaft at the front and rear positions of the knurled portion of the end member; and
A method for attaching an end member to a hollow shaft member for OA equipment. In the mounting method of the end member to the hollow shaft member for OA equipment according to claim 1,
At the same time as or before and after the step of knurling the end member, a rolling step is performed in which the non-knurled portion adjacent to the knurling position of the end member is pressed and deformed in the radial direction so as to be thinner than the original diameter of the end member. A method for attaching an end member to a hollow shaft member for OA equipment. In the mounting method of the end member to the hollow shaft member for OA equipment according to claim 1 or 2,
A method for attaching an end member to a hollow shaft member for OA equipment, wherein the knurling of the end member is a flat knurling process.

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