JPH05111815A - Hole reverse side working method - Google Patents

Abstract

PURPOSE:To implement the reverse side working of a hole part bored in a work from the front surface side of the work. CONSTITUTION:After a hole part 5 is machined in a work 4, a working tool 1 having a working blade 3 on the tip outer circumferential part of a shaft part 2 is inserted into the hole part 5 from the front surface side of the work 4. After this working tool 1 is brought close to the inner circumferential surface of the hole part 5, the working tool 1 is rotated in the direction of the arrow (A) in the figure, and moved along the inner circumferential surface of the hole part 5 as shown by the arrow (B) in the figure. This arrangement allows back burrs 5a of the hole part 5 to be eliminated as shown by the cut lines 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of back-machining a hole formed in a work, in which the back surface of the hole is machined or the counterbore is machined from the front side of the work.

[0002]

2. Description of the Related Art Generally, when a work is perforated from the front side, back burrs are usually formed on the back side of the hole. Therefore, it is necessary to remove this back burr after the hole processing.

Conventionally, as a method for removing the back burr, there has been adopted a method in which the front and back surfaces of the work are reversed after the hole processing and the back surface of the work is directed to the front surface side.

[0004]

In the above-mentioned conventional method for processing a hole, since it is necessary to reverse the work after the hole is processed, the machining is performed using an automatic machine such as a machining center (MC). When carrying out the work, the work of reversing the work becomes a bottleneck, and it is not easy to fully automate the work, and even if this is possible, if the work cannot be reversed due to its structure. Cannot be machined, and in this case, there is a problem in that the hole must be back machined manually.

Therefore, in some cases, a working tool having a folding cutting blade which can be housed in the outer shape of the shaft when not in use is used at an intermediate position of the shaft, and the working tool is used from the work surface side. Insert it into the hole and position the cutting blade on the back side of the hole, then rotate the machining tool in the forward direction, and use the centrifugal force to cause the cutting blade to project from the shaft. A machining method has been proposed in which machining is performed, and after machining, the machining tool is reversed and the cutting blade is housed in the outer shape of the shaft portion, and in that state, the machining tool is pulled out from the hole.

In this machining method, since the back of the hole can be machined from the front side of the work, NC machine tools and M
Although it has the advantage that it can be easily applied to C as well, since it requires the use of a machining tool with a folding cutting blade, there is a certain limit to the miniaturization of the machining tool, and it is suitable for drilling small diameter holes. Is not applicable,
Each time a hole having a different diameter is machined, it must be replaced with a machining tool having a size suitable for the hole diameter. For that purpose, a large number of machining tools having different sizes must be prepared in advance.

Further, in order to make the cutting blade foldable, it is impossible to dispose the cutting blade at the tip of the shaft portion, and it is unavoidable to dispose it at the intermediate position of the shaft portion. If there is an obstacle directly below the hole formed in the hole, the tip of the shaft may hit this obstacle, which may make it impossible to perform back machining of the hole.

The present invention has been made in view of the above situation, and the inner side of the hole can be processed from the front side of the work, and it can be applied to the case of a small diameter hole. It is an object of the present invention to provide a method for processing the inside of a hole that does not require replacement of the processing tool even if the change occurs.

[0009]

As a means for achieving the above-mentioned object, the present invention provides a work in which a hole is drilled from the surface side of the work, and then the work is formed so that the outer periphery of the tip end of the shaft portion projects to the outer diameter side. A machining tool provided with a blade is inserted into the hole portion from the work surface side, and the machining tool is rotated and moved along the inner peripheral surface of the hole portion to remove the back surface of the hole portion or the back seat. The feature is that processing such as boring is performed.

[0010]

In the hole back machining method according to the present invention, a machining tool having a machining blade projecting to the outer diameter side is used on the outer peripheral portion of the tip of the shaft. -Inserted from the front side. For this reason, the backing of the hole is
It becomes possible to do it from the front side of the black.

Further, the working tool rotates itself and moves along the inner peripheral surface of the hole, whereby the inside of the hole is machined. Therefore, even if the hole diameter is changed,
It can be dealt with only by changing the moving path of the machining tool, and it is not necessary to replace it with a machining tool having different dimensions. Also, since it is not necessary to fold the machining blade of the machining tool with respect to the shaft part, it is possible to reduce the size of the machining tool, and it can be applied to small diameter holes, and the machining blade can be used at the tip of the shaft part. Therefore, even if there is an obstacle directly below the hole, it is possible to perform back processing of the hole without any trouble.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 shows an example of a machining tool used when carrying out the hole back machining method according to the present invention. This machining tool 1 has a base end portion which is detachably attached to an NC machine tool or MC. The shaft 2 is provided with a cutting blade 3 for cutting, which protrudes to the outer diameter side, is integrally provided at the outer peripheral portion of the tip of the shaft 2 at equal intervals in the circumferential direction. . And this processing tool 1 is, as shown in FIG. 1 and FIG.
The hole 5 formed in the work 4 is inserted from the front side of the work 4, and the hole 5 is lined.

Next, a method of lining the hole 5 according to this embodiment will be described. When processing, as shown in Figure 1,
First, the work 4 is processed into the hole 5 from the front side thereof. Then, a back burr 5a is formed on the back side of the hole 5 as shown in FIG. Therefore, after the hole 5 is processed, it is necessary to remove the back burr 5a like a cut line 6 shown by a chain line in FIG.

Therefore, when removing the back burr 5a, first, as shown in FIG. 1, the working tool 1 is inserted into the hole 5 from the front side of the work 4, and the inserted working tool is inserted. 1 is brought close to the inner peripheral surface of the hole 5, and
As shown in, the processing blade 3 is positioned immediately below the back burr 5a.

Next, the working tool 1 is rotated as indicated by an arrow A shown in FIGS. 1 and 2, and is moved along the inner peripheral surface of the hole 5 as indicated by an arrow B shown in FIGS. Then, the back burr 5a is removed by the working blade 3, that is, the back surface of the hole 5 or the back counterbore is machined.

When the back machining of the hole 5 is completed, the machining tool 1 is moved toward the center of the hole 5, and the machining tool 1 is pulled up and pulled out from the hole 5. This completes the back processing of the hole 5.

The backing of the above-mentioned series of holes 5 is
It is done by numerical control of NC machine tools and MC.

Since the machining tool 1 is inserted into the hole 5 from the front side of the work 4, the front and back of the work 4 are reversed when the hole 5 is machined. No need. For this reason, full automation by an NC machine tool or MC becomes easy, and there is no forgetting of machining unlike the case of manual work.

Further, since the rotating machining tool 1 is moved along the inner peripheral surface of the hole 5 to perform the back machining, the shape dimension of the machining tool 1 is adjusted to the diameter of the hole 5. There is no need to increase the size. Therefore, the processing blade 3 is attached to the shaft portion 2.
On the other hand, it is not necessary to form a folding structure, and the processing blade can be fixed to the shaft portion 2 and can be arranged at the tip of the shaft portion 2. As a result, the structure of the machining tool 1 is simplified and the size can be reduced, and even if the hole 5 has a small diameter of 4 mm or less, it can be machined without any trouble, and the tip of the machining tool 1 is Since it is not necessary to project the portion below the portion 5 for a long time, even if there is an obstacle directly below the hole 5, there is no problem that the tip of the machining tool 1 hits the obstacle and machining becomes impossible.

Further, even if the diameter of the hole 5 is changed, it is possible to cope with the change in the diameter of the hole 5 only by changing the movement locus of the processing tool 1 shown by the arrow B in FIGS.
There is no need to prepare many types.

The machining shape for the back machining of the hole 5 is adjusted by adjusting the shape of the machining blade 3, the distance between the machining tool 1 and the inner peripheral surface of the hole 5, or the feed amount of the machining tool 1 in the axial direction. ,
It can be set arbitrarily and can sufficiently meet a wide variety of requirements.

In the above embodiment, the case where the machining tool 1 having the four machining blades 3 at the tip of the shaft portion 2 is used is explained. However, the number of the machining blades 3 is 3 or less, but 5 or more. But it's okay.

Further, instead of the processing blade 3, as shown in FIG. 4, a processing tool 11 having a one-sided milling-shaped processing blade 13
May be used, or a file-shaped working blade may be used.

[0024]

As described above, according to the present invention, a working tool is provided with a working blade, which is formed on the outer peripheral surface of the distal end of the shaft portion after the work is perforated from the surface side thereof. Is inserted from the work surface side into the hole portion, while rotating the machining tool, and moved along the inner peripheral surface of the hole portion,
Since the back surface of the hole is machined or the counterbore is machined, the hole can be machined from the front side of the work and also applicable to small diameter holes. Further, even if the hole diameter is changed, it is not necessary to change the processing tool according to the size of the hole diameter, and even if there is an obstacle directly below the hole portion, the back processing can be performed without any trouble.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a method for processing a back of a hole according to the present invention.

FIG. 2 is an explanatory diagram showing a state of a hole portion when performing back processing, as viewed from above in FIG.

FIG. 3 is a perspective view of a main part showing a processing tool used when performing a back processing dimension of a hole according to the present invention.

FIG. 4 is a main part configuration diagram showing a modified example of the processing tool.

[Explanation of symbols]

 1,11 Processing tool 2 Shaft part 3,13 Processing blade 4 Work 5 Hole part 5a Back burr A, B Arrow

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Kenichi Okuyama 598-5 Matsuhidai, Matsudo City, Chiba Prefecture (72) Terutake Takahashi 3-10-31 Kunugiyama, Kamagaya City, Chiba Prefecture

Claims (1)

[Claims] 1. A working tool, which is provided with a working blade projecting to the outer diameter side on the outer periphery of the tip end of a shaft after drilling the work from the surface side of the work. Inserted from the front side, while rotating this machining tool, it is moved along the inner peripheral surface of the hole, and the back of the hole is chamfered or the back face of the hole is machined. Processing method.