JPS60199530A - Caulking method of shaft - Google Patents

Abstract

PURPOSE:To caulk well a shaft and to stabilize quality by forming a hole in the center of the end face of a shaft to be caulked and attaching a projecting part corresponding to the hole to a punch slidably in the caulking direction by tapering the projecting part in the projecting direction and performing punching by fitting it to the hole. CONSTITUTION:A hole 9a is formed in the center of the end face of a shaft 9 to be caulked, and a projecting part 10a corresponding to the hole 9a is attached to the center of the front end of a punch 10 slidable in the caulking direction by tapering the part 10a in the projecting direction. The shaft 9 is well caulked without causing center misalighnment by inserting and fitting the projecting part 10a to the hole 9a. Further, the part 10a is inserted more easily into the hole 9a by sliding the punch 10 when the front end of part 10a is tapered.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention mainly describes a conventional shaft caulking method for various electronic devices, with reference to FIG. 0 In FIG. 1, 1 indicates a variable resistor. , and 2 is the axis.

3 is a bearing, 4 is a contact holder, and 5 is a sliding contact. 6 is the lower mold for taking the mold, 7 is the shaft 2 of variable resistor 1
It is a caulking punch for caulking.

Conventionally, the center position of the upper end 2b of the shaft 2 and the caulking punch 7 was determined by fitting the lower end 2a of the shaft 2 into the mold hole 6a of the lower die 6 and determining the axial positions of the lower die 6 and the caulking punch 7. However, if the lower die 6 is made movable to improve workability when inserting the shaft 2, bearing 3, etc., there will be a large error in center positioning of the caulking punch 7 and the lower die 6, making it impossible to perform stable shaft caulking. There was a problem.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned drawbacks of the conventional example, and makes it possible to improve workability and stably swage the shaft.

Structure of the Invention In order to achieve the above object, the present invention forms a hole in the end face on the central axis of the shaft, and makes the protrusion corresponding to the hole slidable in the crimping direction on the end face of the crimping punch, and has a protruding part. It is installed under a negative force in the direction of It becomes possible.

DESCRIPTION OF EMBODIMENTS Hereinafter, a shaft caulking method in an embodiment of the present invention will be described with reference to the drawings.

As shown in the figure, in the caulking method in one embodiment of the present invention, a hole 9a is provided at the tip of the shaft 9 of the variable resistor 8 on the central axis. Furthermore, a protrusion 10a corresponding to the hole 9a is attached to the end face of the caulking punch 10 so as to be slidable in the caulking direction. In addition, the protruding portion 10 a fl is negatively biased in the protruding direction, and is configured to be retracted with a force that does not affect the crimping of the shaft.

When crimping the shaft 9, first the crimping punch 10 is lowered and the protrusion 10a fits into the hole 9a. Since the central axis of the caulking punch 10 and the central axis of the shaft 9 coincide, stable caulking of the shaft can be performed.

Note that the misalignment of the central axis at this time is due to the difference between the protrusion 10a and the hole 9.
Although this appears as a fitting error with a, it is a very small error and does not reduce the stability of the work.

If the deviation between the center of the caulking punch 10 and the center of the shaft 9 is A, then if A<d/2 (d: diameter of the hole 9a of the shaft 9), the shaft 9 will be guided by the protrusion 10a of the caulking punch 1o and will be caulked. The misalignment between the center axes of the punch 10 and the shaft 9 is small, and the lower die (not shown) can be made movable, improving workability and making it possible to stably swage the shaft.

The protrusion 10a of the caulking punch 10 may have a sharp tip as shown in FIG. 2 to improve workability.

Effects of the Invention As described above, according to the shaft caulking method of the invention, it is possible to reduce the misalignment between the center axis of the caulking punch and the shaft, and it is possible to perform stable caulking of the shaft, thereby stabilizing the quality of the manufactured products. can.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional shaft caulking method, and FIG. 2 is a block diagram showing a shaft caulking method in an embodiment of the present invention. 9...shaft, 9a - hole, 1o caulking punch, 10
a-Protrusion. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure Otsu α Figure 2

Claims (2)

[Claims] (1) A hole is formed in the end face on the central axis of the shaft, and a protrusion corresponding to the hole is attached to the end face of the caulking punch so that it can slide in the caulking direction and be negatively biased in the protrusion direction, and the protrusion A method of caulking a shaft in which the caulking punch applies force to the shaft while the part is fitted into the hole. (2) A method for caulking a shaft according to claim 1, wherein the tip of the protruding portion is sharpened and the hole is shaped such that the protruding portion fits therein.