JP2001009623A - Burr removing cutting tool and method for removing burr by using the cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a burr removing cutting tool to completely remove burrs generated at a drill hole and to provide a method for removing burrs by using the burr removing cutting tool. SOLUTION: A recessed part 3 is formed in one end face as a burr removing method to remove burrs 11a generated at the first oil hole 11 of a crank shaft (a work) 10 formed by drilling a second oil hole (a drill hole) 12, having a given angle α with a first oil hole 11, after the first oil hole (a drill hole) 11 is drilled. A burr removing cutting tool 1 having the recessed part 3, the outer peripheral edge of which an edge-form cutting edge 4 is constituted, is inserted in a first oil hole 11 from a direction opposite to the second oil hole 12 to remove the burrs 11a. This constitution, since the recessed part 3 is formed inside the cutting edge 4 of the burr removing cutting tool 1, prevents the burrs 11a from the occurrence of escape due to the burr removing cutting tool 1 and cuts the burrs 11a by the cutting edge 4 of the burr removing cutting tool 1 for complete removal of the burrs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deburring tool for removing burrs generated in a drill hole of a work, and a deburring method using the same.

[0002]

2. Description of the Related Art FIG. 3 shows a partial cross section of a crankshaft 10 of a four-stroke engine. In the crankshaft 10, a first oil hole 11 for lubrication is formed in a journal portion 10a.
Is drilled by a drill 21 in a direction perpendicular to the crank axis. Then, a second oil hole 12 for lubrication is formed by a drill 22 from the crank pin 10 b to the journal 1.
The first oil hole 11a is formed obliquely toward the first oil hole 11 and the second oil hole 12 communicates with the first oil hole 11.

By the way, in the drilling, the second oil hole 12 is processed to form the second oil hole 11 into the second oil hole 11.
As shown in detail in FIG. 4 (enlarged detailed view of part A in FIG. 3), burrs 11a are generated around the portion where the oil hole 12 is opened.

Therefore, conventionally, the drill 21 is put in and taken out of the first oil hole 11 several times while rotating, and then the drill 22 is put in and out of the second oil hole 12 several times while rotating. The burr 11a was removed.

[0005]

However, the drill 2
Since the cutting edges 1 and 22 have a convex shape, even if the burrs 11a are removed while rotating them,
Escaped, and it was impossible to completely remove the burr 11a.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a deburring tool which can completely remove burrs generated in a drill hole and a deburring method using the same. It is in.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, a deburring blade has a concave portion on one end surface, and the outer peripheral edge of the concave portion has a knife-edge-shaped cutting edge. It is characterized by doing.

According to a second aspect of the present invention, in the first aspect of the present invention, a first coolant hole that opens into the concave portion extends through the first coolant hole in the axial direction, and branches off from the first coolant hole to form an outer peripheral surface. A second coolant hole is formed which opens to the second coolant hole.

According to a third aspect of the present invention, in the second aspect of the present invention, a concave groove is formed over the entire outer peripheral surface near the cutting blade, and the second coolant hole is opened in the concave groove. It is characterized by being confused.

According to a fourth aspect of the present invention, after the first drill hole is drilled, the second drill hole is formed at a predetermined angle with respect to the first drill hole. As a deburring method for removing burrs generated in the first drill hole, a deburring tool having a concave portion on one end surface and an outer peripheral edge of the concave portion serving as a knife-edge-shaped cutting blade is provided on the first drill hole. It is characterized in that burrs are removed by being inserted from the direction facing the second drill hole.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the deburring blade is rotated to remove burrs while supplying coolant from a coolant hole formed in the deburring blade. It is characterized by the following.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partial longitudinal sectional view of a deburring tool according to the present invention, and FIG. 2 is a bottom view of the deburring tool.

The deburring blade 1 according to the present invention has a main body 2 made of a round bar-shaped metal, and a conical concave portion 3 is formed at the lower end surface of the main body 2. The lower peripheral edge) constitutes a knife-edge-shaped cutting blade 4. still,
The angle β formed by the conical slope 3a forming the recess 3 with respect to the axis of the main body 2 is such that the second oil hole 12 shown in FIG.
Is smaller than the angle α formed with respect to the oil hole 11 (β <
α) is set.

The lower end of the main body 2 on the side where the cutting blade 4 is formed constitutes a large-diameter portion 2a having a larger diameter than other portions, and a concave portion is formed on the outer peripheral surface of the large-diameter portion 2a. The groove 5 is formed over the entire circumference. The outer diameter d of the large diameter portion 2a is 0.1 to 0.1 times larger than the inner diameter D of the first oil hole 11 shown in FIG.
It is set to be 0.2 mm smaller (d = D-0.1 to 0.2 mm).

At the center of the axis of the main body 2, first and second coolant holes 6 and 7 having large and small diameters are formed so as to open into the recess 3, and four second coolant holes 6 are formed through the large diameter coolant hole 6. Coolant holes 8 are branched, and these second coolant holes 8 extend obliquely downward from the first coolant holes 6 radially outward and into the concave grooves 5 formed on the outer peripheral surface of the main body 2. Each is open.

Next, a deburring method according to the present invention using the deburring blade tool 1 according to the present invention having the above configuration is shown in FIG.
It will be described based on.

In the crankshaft 10 for a four-stroke engine shown in FIG. 3, the first oil hole 11 for lubrication is formed in the journal portion 10a by a drill 21 in a direction perpendicular to the crankshaft axis as described above. After that, the second oil hole 12 for lubrication is formed by the drill 22 with the crank pin 1.
0b to the first oil hole 11 of the journal portion 10a.
, And the second oil hole 12 is communicated with the first oil hole 11.

In the above-mentioned hole machining, the burr 11a (FIG. 4) is formed around the portion of the first oil hole 11 where the second oil hole 12 is opened by machining the second oil hole 12.
Burrs 11a must be removed, and the burrs 11a need to be removed.
And is removed in the following manner.

That is, when removing the burrs 11a, the direction in which the deburring blade tool 1 faces the second drill hole 12 in the first oil hole 11 where the burrs 11a are generated (burrs 11a
(From the top to the bottom in FIG. 3). At this time, the deburring blade 1 is rotationally driven by a driving means (not shown), and the coolant flows from the coolant holes 6 to 8 formed in the recess 3 and the large diameter portion 2a of the deburring blade 1 and the first oil. It is supplied to the gap between the hole 11.

As described above, the deburring blade 1 is rotated while supplying the coolant from the coolant holes 6 to 8 formed in the deburring blade 1, and the deburring blade 1 is rotated into the first oil hole 11 by the second oil hole 11. When inserted from the direction opposite to the drill hole 12, the burr 11 a generated in the first oil hole 11 is formed.
Is cut and removed by the cutting blade 4 of the deburring blade 1, and the removed burr 11 a is discharged from the first oil hole 11 together with the coolant. In this case, the deburring tool 1
Is inserted into the first oil hole 11 from the direction facing the burr 11a, and the recess 3 is formed inside the cutting edge 4 at the lower peripheral edge of the deburring blade 1, so that the burr 11
a is surely removed by the deburring blade 1 without escaping, and does not remain in the first oil hole 11. still,
The coolant supplied to the deburring tool 1 removes the burr 11 a removed by the deburring tool 1 from the first oil hole 11.
And a function of removing frictional heat generated between the deburring blade 1 and the first oil hole 11.

In this embodiment, the case of removing burrs generated by machining a lubricating oil hole in a crankshaft has been particularly described. However, the deburring tool according to the present invention and a deburring method using the same are described in the following. The present invention can be similarly applied to the removal of burrs generated in cross holes (a plurality of drill holes formed at a predetermined angle from each other) formed in an arbitrary work.

[0023]

As is apparent from the above description, according to the present invention, a deburring tool having a concave portion on one end surface and having a peripheral edge of the concave portion serving as a knife-edge-shaped cutting edge generates burrs. Since the burrs are removed by inserting the burrs into the first drill hole from the direction facing the second drill hole, the burrs do not escape with the deburring tool, and the burrs are cut by the cutting blade of the deburring tool. This has the effect of completely removing this.

[Brief description of the drawings]

FIG. 1 is a partial vertical sectional view of a deburring tool according to the present invention.

FIG. 2 is a bottom view of the deburring tool according to the present invention.

FIG. 3 is a partial sectional view of a crankshaft.

FIG. 4 is an enlarged detail view of a portion A in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Deburring tool 2 Main body 3 Concave part 4 Cutting blade 5 Concave groove 6,7 1st coolant hole 8 2nd coolant hole 10 Crankshaft (work) 11 1st oil hole (1st drill hole) 11a Burr 12 Second oil hole (second drill hole) 21, 22 Drill

Claims (5)

[Claims] 1. A deburring blade having a concave portion on one end surface, wherein the outer peripheral edge of the concave portion forms a knife-edge-shaped cutting blade. 2. A method according to claim 1, wherein a first coolant hole opened in the concave portion is provided in the axial direction, and a second coolant hole branched from the first coolant hole and opened to the outer peripheral surface is formed. The deburring cutting tool according to claim 1, wherein 3. The deburring according to claim 2, wherein a concave groove is formed on the outer peripheral surface near the cutting blade over the entire circumference, and the second coolant hole is opened in the concave groove. edged tool. 4. The method according to claim 1, wherein after the first drill hole is drilled, a second drill hole formed at a predetermined angle with respect to the first drill hole is formed in the first drill hole of the workpiece. A method for removing burrs, wherein a deburring tool having a concave portion on one end surface and a peripheral edge of the concave portion forming a knife-edge-shaped cutting blade is provided in the first drill hole and the second drill hole. A method for removing burrs, comprising inserting burrs from opposite directions to remove burrs. 5. The deburring method according to claim 4, wherein said deburring blade is rotated while supplying coolant from a coolant hole formed in said deburring blade to remove burrs.