JP2004209518A - Method for fitting end member to hollow shaft member for oa equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fitting method by which grooving of an end member is unnecessitated and also variation of concentricity after caulking is reduced in the case of fitting the end member to a hollow shaft member for OA equipment. <P>SOLUTION: In the method for fitting the end member to the hollow shaft member for OA equipment by which the end member having an outside diameter which is equal to the inside diameter of the hollow shaft is inserted in the end part of the hollow shaft and the hollow shaft and the end member are fixed by caulking the inserted part from the outside in a plurality of places of the hollow shaft, one or more lines of knurling are applied at proper intervals of the part to be inserted in the hollow shaft of the end member before inserting the end member in the hollow shaft, next, the knurled end member is forced into the hollow shaft and furthermore the hollow shaft is caulked in a plurality of places from the outside of the streaked part formed on the inside of the hollow shaft in the rear of the knurled part of the end member. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for attaching an end member to a hollow shaft member for OA 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). 9 and 10, a groove 23 is formed in an 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. Was caulked at three points from the outside of the hollow shaft 21 to fix the hollow shaft 21 and the end member 22.
[0003]
[Patent Document 1]
JP-A-2002-257150 (FIGS. 1 and 2)
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional method, a step of forming the groove 23 in the end member 22 by machining is required, and there is a problem that the cost is increased accordingly. In addition, since the groove 23 is caulked at three points from the outside of the hollow shaft 21, the deeper the groove 23, the greater the amount of caulking, and the greater the concentricity between the hollow shaft 21 and the end member 22 after caulking. There was a problem.
Accordingly, an object of the present invention is to propose a method of mounting an end member on a hollow shaft member for OA equipment, which eliminates the need for groove processing of the end member and has a small variation in concentricity after caulking.
[0005]
[Means for Solving the Problems]
Therefore, in order to solve the above-mentioned problem, 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 an end of the hollow shaft, and to caulk the hollow shaft at the inserted portion from outside at a plurality of positions. In the method of attaching an end member to a hollow shaft member for OA equipment for fixing the hollow shaft and the end member, before inserting the end member into the hollow shaft, the end member is inserted into the hollow shaft at an appropriate interval. A step of applying knurling of more than one row, a step of press-fitting the knurled end member into the hollow shaft, and after press-fitting the end member into the hollow shaft, formed inside the hollow shaft behind the knurled portion of the end member. And a step of caulking the hollow shaft at a plurality of locations from outside the striation portion.
Here, simultaneously with or before or after the step of performing knurling on the end member, a non-knurled portion adjacent to the knurling position of the end member is pressed and deformed in the radial direction so as to be formed smaller than the original diameter of the end member. It is also possible to provide a rolling process.
Furthermore, it is preferable that the knurling of the end member is a flat knurling.
[0006]
BEST MODE FOR CARRYING OUT 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 the steps in the present invention.
FIG. 1 is an external view of a shaft 1 which is an end member inserted into a 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 shows that three flat knurls 2 to 4 are applied at appropriate intervals to a portion of the shaft 1 to be inserted into the hollow shaft. FIG. 3 shows a sectional view taken along line AA and a sectional view taken along line BB of FIG. Assuming that the diameter of the shaft 1 is a, the ridge diameter of the knurl portion is b, and the valley diameter is c, the relationship of b> a and c <a is established therebetween.
[0007]
Next, FIG. 4 shows a state where the shaft 1 is press-fitted into a hollow shaft 5 made of aluminum having the same outer diameter and inner diameter as the shaft 1. In this case, since the knurling process 2 to 4 is performed and the mountain diameter b of the knurl portion becomes larger than the inner diameter of the hollow shaft 5, a certain force is required for press-fitting. Next, FIG. 5 shows a vertical sectional view and a right side view of the state where 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, streaks 6 to 8 are formed by the knurls inside the hollow shaft 5 behind the knurled portions 2 to 4.
[0008]
Next, FIG. 6 shows a longitudinal sectional view and a sectional view taken along line CC of the state where the hollow shaft 5 is caulked, and FIG. 7 shows an external view of FIG. After the shaft 1 is press-fitted into the hollow shaft 5, the outer portions of the streaks 6 to 8 of the hollow shaft 5 are simultaneously caulked using upper and lower six punches using a press machine (not shown). The caulking traces 11A to 11D, 12A to 12D, and 13A to 13D are formed outside the 6 to 8 streaks. Since the caulking traces 11A to 13D caulk 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 at the streaks 6 to 8 is moderate. The caulking amount is obtained, and the strength required for coupling the hollow shaft 5 and the shaft 1 is obtained, and the coaxiality between the hollow shaft 5 and the shaft 1 is reduced, and the quality is stabilized.
[0009]
FIG. 8 is an explanatory diagram showing a case where the processing 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 rows of knurling are performed. In particular, the rolling dies 14 and 15 form a constricted portion at three places on the outer periphery of the shaft 1 by slightly expanding the outer diameter of B between the two knurled portions and the outer diameters of the outer portions A and C of the knurled portion. I am trying to do it. These constricted portions become portions that 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 appropriately caulked. In the present invention, knurling is preferably performed in two or three rows at appropriate intervals, but may be performed in one or four or more rows. The knurling may be a knurling process other than a plain knurling process, but is preferably a flat knurling process.
[0010]
【The invention's effect】
As described above, according to the present invention, the outer peripheral portion of the end member inserted into the hollow shaft is subjected to knurling and then press-fitted and caulked, so that groove processing of the end member becomes unnecessary, and the And the hollow shaft outside the front and back of the knurling position is swaged, so the swaging amount is smaller than before, and the concentricity between the hollow shaft and the end member is less, and the quality is improved. I do.
[Brief description of the drawings]
FIG. 1 is an external view of a shaft as an end member inserted into a hollow shaft of the present invention.
FIG. 2 is a diagram showing that flat knurling is performed on a shaft.
FIG. 3 is a sectional view taken along line AA and a line BB of FIG. 2;
FIG. 4 is a longitudinal sectional view showing a state where a shaft is pressed into a hollow shaft.
FIG. 5 is a vertical sectional view and a right side view showing a state where the shaft is press-fitted into the hollow shaft.
FIG. 6 is a longitudinal sectional view showing a state where the hollow shaft is caulked, and a sectional view taken along line CC.
FIG. 7 shows an external view of FIG.
FIG. 8 is an explanatory diagram showing a case where a 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 Shaft 2-4 Knurling 5 Hollow shaft 6-8 Streaks 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 of the hollow shaft, and the hollow shaft at the inserted portion is caulked at a plurality of locations from the outside to fix the hollow shaft and the end member to a hollow shaft member for OA equipment. In the mounting method of the end member,
Before inserting the end member into the hollow shaft, a step of performing one or more knurling at appropriate intervals on a portion where the end member is inserted into the hollow shaft,
A step of press-fitting the knurled end member into the hollow shaft,
After press-fitting the end member into the hollow shaft, a step of caulking the hollow shaft from the outside of the streak portion formed inside the hollow shaft behind the knurled portion of the end member at a plurality of positions,
A method of attaching an end member to a hollow shaft member for OA equipment, comprising: The mounting method of the end member to the hollow shaft member for OA equipment according to claim 1,
Rolling step of pressing or deforming a non-knurled portion adjacent to the knurling position of the end member in the radial direction simultaneously with or before or after the step of knurling the end member to form the end member smaller than the original diameter of the end member A method of attaching an end member to a hollow shaft member for OA equipment, comprising: The mounting method of the end member to the hollow shaft member for OA equipment according to claim 1 or 2,
A method of 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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