JP2000042811A - Deburring device for shaft-like steel material part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent damage to the steel material part even if a highly rigid material is used for a blade by slidingly arranging the blade in a spring blade, arranging a spring for projecting the blade outside, and rounding an edge of the blade. SOLUTION: A blade 2 is slidingly arranged in the space part 1a formed in a spring blade 1, and the tip part of the blade 2 projects from the side of the spring blade 1. A spring 3 is similarly arranged in the space part 1a so as to abut on the blade 2, and this spring 3 has energizing force in the direction for pushing the blade 2 outside the spring blade 1. Roundness is formed on an edge of the blade 2. The blade 2 is formed of a material capable of obtaining high hardness of high-speed steel or the like to improve abrasion resistance of the edge.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deburring apparatus used for deburring a shaft steel part such as an amateur shaft.

[0002]

2. Description of the Related Art The prior art will be described with reference to FIGS. The amateur shaft 4 is a component located on the rotating shaft of the armature, and has a function of transmitting a rotating force and a function of connecting and holding a core and a commutator. In general, the amateur shaft 4 protects a user from a charged part such as a coil by interposing an insulating resin between a core and a commutator.

When the armature shaft 4 is coated with the insulating resin 5, a fitting portion between the armature shaft 4 and a molding die is formed.
The resin burr 5b adheres to the outer diameter of the ball bearing press-fitting portion 4b (gap amount: 15 to 20 μm) with a thickness of 15 to 20 μm over 1 to 3 mm. Press-fit part 4b has dimensional accuracy
(With a dimensional tolerance of 10 μm or less), it is necessary to peel off the resin burr 5b attached to the outer diameter of the press-fit portion 4b. At this time, since the surface of the press-fitting portion 4b must not be damaged, a cutting tool such as a knife or a file cannot be used.

Conventionally, the tip of a soft phosphor bronze rod is sharpened like a spatula (about 60 degrees), and the armature shaft 4 is fixed at both centers.
While rotating by hand, the phosphor bronze rod was pressed against the outer diameter of the press-fitting portion 4b to remove the resin burr 5b.

[0005]

The above-mentioned working method has the drawbacks that it takes time and labor due to manual work, and the phosphor bronze is quickly worn out due to its soft material.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive and wear-resistant deburring apparatus which overcomes the above-mentioned disadvantages of the prior art.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a spring blade with a blade slidably provided therein, a spring for projecting the blade outward from the spring blade in the spring blade, and the blade edge of the blade is rounded. Is achieved by

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view of the deburring apparatus, FIG. 2 is an enlarged view around the blade of FIG. 1, and FIG. 3 is an explanatory view showing an operation for removing resin burrs.

In FIG. 1, a blade 2 is slidably provided in a space 1 a formed in a spring blade 1, and the tip of the blade 2 projects from the side of the spring blade 1. Similarly, a spring 3 is provided in the space 1a so as to abut against the blade 2.
Has a biasing force in a direction to push the blade 2 out of the spring blade 1. As shown in FIG. 2, the blade edge 2a of the blade 2 is rounded (R0.3 in this embodiment). Further, the blade 2 has a high hardness such as high speed steel (in this embodiment, high speed (YXM-1) .HRC 65 ± 2 is used) in order to improve the wear resistance of the cutting edge 2a.
Is formed of the material from which is obtained.

FIG. 4 shows the appearance of the amateur shaft 4 and FIG.
Is the ball bearing press-fit portion 4b of the amateur shaft 4.
Before the burr finishing in which the insulating resin 5 is formed on the armature shaft 4, the resin burr 5a is formed in the clearance groove 4a.
Thin resin burrs 5b are generated in the press-fitting portion 4b.

Hereinafter, a deburring procedure will be described with reference to FIGS. First, since the end surface 4c of the shaft 4 serves as a reference surface for abutting the ball bearing, the resin burr 5a in the clearance groove 4a is removed. The resin burr 5a in the escape groove 4a is rotated by the shaft 4 so that the commercially available cutting tool 6 is inserted into the escape groove 4a.
a to remove the resin burr 5a. At this time, the escape groove 4a may be damaged by the commercial cutting tool 6,
There is no problem in press-fitting the ball bearing.

Next, with the shaft 4 being rotated, the blade 2 is pressed against the resin burr 5b of the press-fitting portion 4b. When the blade 2 is pressed, the blade 2 retreats against the urging force of the spring 3, so that a constant pressing force is applied to the press-fitting portion 4b, and the blade 2a of the blade 2 is rounded to damage the press-fitting portion 4b. And the resin burr 5b is removed. In addition,
The pressing force of the blade 2 is preferably such that the press-fit portion 4b is not shaved while removing the resin burr 5b.
The pressing force is about 1.3 kg. Also, the spring blade 1 itself is formed into a compact shape (for example, a tool holder type) that can be mounted on an automatic lathe, so that the spring blade 1 is mounted on the automatic lathe and the deburring operation is automated, thereby reducing the number of work steps. Cost savings.

[0013]

According to the present invention, a spring having a biasing force is provided in a direction in which the blade protrudes outward from the spring blade, and the blade edge of the blade is rounded, so that a highly rigid material is used for the blade. In addition, the resin burr can be removed without damaging the steel part, and the wear resistance of the blade is also improved.

[Brief description of the drawings]

FIG. 1 is a side view of a deburring apparatus showing an embodiment of the present invention.

FIG. 2 is an enlarged view around the blade of FIG. 1;

FIG. 3 is an explanatory view of an operation for removing resin burrs.

FIG. 4 is a side view of an amateur shaft.

FIG. 5 shows an amateur shaft coated with an insulating resin.
FIG.

[Explanation of symbols]

1 ... spring blade, 2 ... blade, 3 ... spring.

Claims (1)

[Claims] A burr for a shaft steel part, wherein a blade is slidably provided on a spring blade, a spring is provided inside the spring blade so as to project the blade outward of the spring blade, and the blade edge of the blade is rounded. Taking device.