JPH11104916A - Chamfering tool for worked hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent fatigue by manual operation, and surely and speedily conduct chamfering to enhance working efficiency in the case of chamfering an inner surface of a worked hole for an extrusion-molded hollow section made of aluminum or an aluminum alloy. SOLUTION: A cutter face 3 having an edge line 2 on a conical surface in the direction passing through the axial center of a truncated cone and a clearance angle β relating to the edge line is formed in a cutting tool 1 having a truncated cone-shaped cross section and having a bottom part 1b of a larger diameter than the hole diameter (d) of a hole 7 drilled in a section 6. An outer surface 4 having a smaller distance from the outer edge of the bottom part than the diameter (d) is formed successively in a cutter face base part to pass through the worked hole 7, and a shaft 5 is implanted in the top part of the truncated cone. The cutting tool 1 is rotated to conduct chamfering for the hole 7 while the cutting tool 1 connected to an electric motor is pulled out from the hole 7 of the section 6 after insertion of it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool for removing burrs formed inside a hollow material or a hollow material extruded from a metal such as aluminum or aluminum alloy or a synthetic resin and having a shape similar thereto.

[0002]

2. Description of the Related Art Conventionally, a method of removing a burr that always occurs after a hole is formed in a hollow mold material or a mold material having a similar shape cannot be worked from the inside of the mold material. A simple hand tool 9 having a blade is inserted into the machining hole 7 from the outside, and is pressed by hand from the inside onto the workpiece 6 as a workpiece, and FIG. 7B is a view taken along the line bb in FIG. As shown in (2), the hand tool 9 is moved while pushing or pulling it along the circumference of the hole 7 while slightly tilting to perform the deburring.

[0003] For example, as shown in FIG.
When drilling a hole with a drill 10, the burr always comes out inside as shown in FIG. 8 (B). In the case of a hollow material, the tool for removing the burrs does not enter the inside, so it has to be performed by the method shown in FIG.

[0004]

However, such a method for removing a hole from a machined hole is a manual operation, and therefore has the disadvantage that the fatigue of the wrist and fingers increases as the number of holes increases. Further, since the state of the burrs inside the shape member cannot be seen, the user has to work with a sense. Furthermore, if the hole diameter is small, the angle at which the tool is pressed is limited, and the burrs may not be removed. Due to these drawbacks, the conventional method has a problem that the working efficiency is not improved.

The present invention has been made in view of such circumstances, and its use has been made to prevent fatigue caused by manual work, which is a drawback of the conventional deburring method.
It is an object of the present invention to provide a tool for removing a hole formed in a hollow material of this kind, which can reliably and promptly remove a hole and improve work efficiency.

[0006]

In order to achieve the above object, according to the present invention, as a tool for removing the burrs on the inner surface of a processing hole of a hollow die, a hole of a processing hole 7 drilled on a side surface of the die 6 is provided. Top 1a with a diameter smaller than the diameter and bottom with a diameter larger than the hole diameter
1b, a cutting tool 1 having a truncated cone shape in cross section is provided with a cutting line 2 on a conical surface in a direction passing through the axis of the truncated cone and a cutting surface 3 so as to have a predetermined clearance angle β with respect to the cutting line. Form. Further, the outer surface 4 having a distance F from the outer edge of the bottom portion 1b smaller than the hole diameter of the machining hole 7 is continuously attached to the blade surface base.
Is formed so that it can pass through the machining hole, and a predetermined drive shaft 5 that passes through the axis of the truncated cone at the top 1a of the truncated cone.
Is installed so that it can be connected to the electric motor. Then, after inserting the cutting tool 1 into the processing hole 7 of the mold material, the cutting tool 1 is driven to rotate while being pulled out to remove the burrs of the processing hole.

As a result, the drive shaft 5 implanted on the top 1a of the cutting tool 1 is connected to a manually operable electric motor, and the cutting tool 1 is placed in a non-driven state on the side surface of a hollow mold 6 which is a workpiece. After being inserted into the perforated processing hole 7 and being positioned in the hollow portion of the die 6, when the electric motor is energized to rotate the bite 1 and pull out the bite 1 from the hollow portion of the die 7, Since the cutting tool 1 has a truncated truncated conical cross section, the conical surface of the cutting tool 1 stably abuts the inner peripheral edge of the machining hole 7 and the cutting edge of the cutting tool uniformly contacts the peripheral edge of the hole to be machined and rotates. With the blade line 2 formed on the conical surface and the blade surface 3 formed so as to have a predetermined clearance angle β with respect to the blade line, the burr formed at the lower part of the inner peripheral edge of the machining hole 7 is reliably ensured. Can be stably resected.

The outer surface 4 whose distance F from the bottom outer edge of the cutting tool 1 is smaller than the hole diameter of the machining hole 7 is formed at least at an obtuse angle with the blade surface 3 and is parallel to the axis of the conical portion. It is advisable to form it on a flat surface. Thereby, the cutting tool 1 that can easily pass through the processing hole 7 and pass therethrough can be manufactured.

It is also possible to form another cutting surface 3 on the cutting tool 1 symmetrically with respect to the axis of the blade surface 3 and the outer surface 4 continuous with the blade surface. As a result, the blade can be formed into two surfaces, and the efficiency of deburring can be increased, and the working time can be reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the accompanying drawings. 1 (A) is a front view of the tool of the present invention, FIG. 1 (B) is a sectional view taken along a line aa, FIG. 2 (A) is a plan view of the tool, and FIG. The figure is shown.

The tool T is formed integrally with a circular cutting tool 1 having a diameter larger than the diameter of the hole 7 to be processed and a drive shaft (shaft) 5 for rotating the cutting tool. The cutting tool 1 has a top 1a having a diameter smaller than the diameter of the hole 7 to be processed and a bottom 1b having a diameter larger than the diameter of the hole 7 and has a truncated cross section having a conical surface inclination angle θ (see FIG. 2B). It is formed in a truncated cone shape, and a predetermined drive shaft 5 passing through the axis of the truncated cone is planted at the top 1a so as to be connectable to an electric motor. In the drawing, A is the diameter of the top 1a of the cutting tool, B is the diameter of the bottom 1b, C is the effective top diameter for performing the deburring, and D is the effective bottom diameter.

In order to enable a tool to be inserted into the hole from the outside of the workpiece 6, the cutting tool 1 has a distance F (see FIG. 2A) from the outer edge of the bottom 1b. 7, so that the outer surface 4 smaller than the hole diameter d forms an obtuse opening (about 130 ° in the figure) with respect to the blade surface 3 (or blade line 2) described later. And cut continuously in parallel with the base of the blade surface.

Further, in order to provide the blade on the conical surface, the blade line 2 is provided on the conical surface at a position where the distance E from the bottom outer edge is half of the bottom diameter B, that is, the conical surface in the direction passing through the axis of the truncated cone. And the conical surface is cut off so as to have a predetermined clearance angle β with respect to the blade line 2 to form a blade surface 3 (FIG. 1 (A)).
FIG. 1B, which is an aa cross section of FIG.

The tool bit 1 thus formed is
By pulling out from the inner surface of the workpiece to the hole 7 of the workpiece 6 in a direction perpendicular to the hole surface, that is, in the H direction, the conical surface of the cutting tool 1 can be evenly pressed against the lower peripheral edge of the hole 7 of the workpiece. it can. Thereby, the driving shaft (shaft) 5 of the tool T is connected to the driving motor, and the cutting tool 1 can be rotated in the direction of FIG.

The dimensions A to F of the cutting tool 1 and the inclination angle θ of the conical surface may be determined in accordance with the diameter d of the machined hole. In addition, the clearance angle β of the blade surface may be determined depending on the material of the workpiece. The machining hole diameter d that can be handled by the tool T is in the range of D from the effective diameter C, and the effective diameter range can be used in a wider range by reducing the inclination angle θ of the conical surface.

Next, the procedure for inserting the tool T into the hole to be machined will be described. (1) In FIG. 3 (A), the end on the dimension F side of the cutting tool 1 mounted on the electric motor 8 held by hand is inserted into the hole 7 in the direction of arrow b. FIG. 3B shows the positional relationship. In addition,
At this time, the motor is not yet rotated. (2) In FIG. 4 (A), while further moving the hand holding the electric motor 8 in the direction of arrow C, operate the tool so that the cutting tool 1 turns in the direction of arrow d so that the hand enters the inside of the twist hole 7. I do.
The positional relationship is shown in FIG. (3) The same operation is performed as shown in FIG.
Continue until you have everything inside. Fig. 5 (B)
Shown in (4) Finally, as shown in FIG. 6, the cutting tool 1 and the shaft 5 are made to stand perpendicular to the workpiece 6, and the electric motor 8 rotates the shaft 5 in the direction of the arrow G. 2, the conical portion of the cutting tool 1 evenly hits the burr portion of the hole 7, and the burr can be removed by the blade line 2 shown in FIG. (5) When removing the cutting tool 1 from the hole after the machining, the rotation of the electric motor 8 may be stopped and the operation completely opposite to that at the time of insertion may be performed.

[0017]

EXAMPLE As shown in FIG. 8 (C), the present invention was applied to deburring when a hole was formed in an extruded hollow aluminum alloy material 6. That is, as shown in FIG.
Drilling was performed with a mmφ drill 10. At this time, the height h of the burr was 0.5 mm for the hole diameter d = 35 mm in the perforated portion shown in FIG. 8 (B). As the deburring tool T, the tool dimensions in FIGS. 1 and 2 B = 40 mm, E = 20 mm, F = 28 mm,
As a result of using θ = 45 ° and β = 0.5 °, the work time required for 60 seconds per hole can be reduced to 10 seconds or less per hole.
Good results were obtained. In the embodiment, the excavation of the hollow aluminum material extruded from the aluminum alloy has been described. However, the excavation of the machined hole can be performed in the same manner using a hollow material of brass, a material similar thereto, or an extruded hollow material of a synthetic resin. Further, as shown in FIG. 10, the present invention can be applied to chamfering.

[0018]

According to the first aspect of the present invention, a drive shaft implanted at the top of a cutting tool is connected to a manually operable electric motor so as to reduce the diameter of the hole in the workpiece. In a non-driven state, the cutting tool having a large diameter is inserted into a processing hole formed in a side surface of a hollow mold material or a molding material similar thereto in a non-driven state, and is inserted into the machining hole.The electric motor is energized to rotate the cutting tool to rotate the cutting tool. When pulled out from the hollow portion in the direction perpendicular to the hole surface, the conical surface of the cutting tool stably abuts the inner peripheral edge of the processing hole, and the cutting edge of the cutting tool uniformly contacts the peripheral edge of the hole and rotates. The formed burrs can be reliably and stably removed. As a result, it is possible to quickly perform the deburring work while preventing the operator's fatigue, which was the drawback of the conventional manual deburring work hole, and greatly improve the work efficiency. It can greatly contribute to an increase in production capacity.

According to the second aspect of the present invention, the angle between the cutting surface of the cutting tool and the outer surface continuous with the cutting surface is formed at an obtuse angle and in a plane parallel to the axis of the conical portion, so that the cutting tool can be easily formed. A cutting tool that can be inserted through a machined hole can be easily manufactured.

According to the third aspect of the present invention, since the cutting tool is formed on the cutting tool symmetrically with the cutting surface and the outer surface continuous with the cutting surface sandwiching the axis, the cutting tool has two surfaces. Further, the chamfering efficiency can be increased, and the working time can be reduced.

[Brief description of the drawings]

FIG. 1A is a front view of the tool of the present invention.

FIG. 1B is a sectional view taken along line aa of FIG. 1A.

FIG. 2A is a plan view of the tool of the present invention.

2 (B) is a side view of FIG. 2 (A).

FIG. 3 (A) is a work procedure diagram using the tool of the present invention—part 1;

3 (B) is a view showing the positional relationship between the tool and the hole in FIG. 3 (A).

FIG. 4A is an intermediate view of an operation procedure using the tool of the present invention—part 2;

4 (B) is a view showing the positional relationship between the tool and the hole in FIG. 4 (A).

FIG. 5 (A) is an intermediate view of an operation procedure using the tool of the present invention—part 3;

5 (B) is a view showing the positional relationship between the tool and the hole in FIG. 5 (A).

FIG. 6 is a diagram showing a state of removing a tool using the tool of the present invention.

7A and 7B are diagrams showing a conventional deburring operation.

8 (A), 8 (B) and 8 (C) are views showing an embodiment of a deburring operation using the tool of the present invention.

FIG. 9 is a view showing an application example of the tool of the present invention.

FIG. 10 is a diagram showing an application example of the tool of the present invention to another processing.

[Explanation of symbols]

1 ... bite, 1a ... top, 1b ... bottom, 2 ... blade line,
B: blade surface, 4: outer surface, 5: drive shaft (shaft),
6 ... mold material (workpiece), 7 ... machined hole (machined hole),
8: electric motor, F: distance from bottom outer edge to outer surface, T: deburring tool, β: clearance angle, b ...
Buri, b ... chamfering.

Claims (3)

[Claims] 1. A tool for removing burrs on the inner surface of a processing hole of a hollow mold material, comprising a top 1a having a diameter smaller than the diameter of a processing hole 7 drilled on a side surface of a molding material 6, and a tool having a larger diameter than the hole diameter. A cutting tool 1 having a truncated conical shape having a bottom 1b is provided with a cutting line 2 on a conical surface in a direction passing through the axis of the truncated cone and a cutting surface 3 so as to have a predetermined clearance angle β with respect to the cutting line. Forming an outer surface 4 that is continuous with the blade surface base and whose distance F from the outer edge of the bottom is smaller than the hole diameter of the machining hole 7 so that the cutting tool 1 can pass through the machining hole; A predetermined drive shaft 5 passing through the axis of the truncated cone is implanted at the top 1a of the truncated cone so as to be connectable to an electric motor. A drilling tool for drilling holes, which removes the drilling of drilled holes. 2. An outer surface 4 whose distance F from the bottom outer edge is smaller than the hole diameter of the machining hole 7 has a plane formed at least at an obtuse angle with the blade surface 3 and parallel to the axis of the conical portion. The deburring tool for a machined hole according to claim 1, wherein the tool is formed in a hole. 3. A blade surface 3 and an outer surface 4 continuous with the blade surface,
3. The deburring tool according to claim 1, wherein the cutting tool is formed symmetrically with respect to the axis.