JP4608285B2 - Cutting method using rotary cutting tool - Google Patents

Description

  The present invention relates to a cutting method using a rotary cutting tool such as an end mill used for cutting metal or the like.

  Conventionally, rotary cutting tools such as end mills that perform cutting while rotating around a rotation axis have been used in the field of cutting of metal or the like. This rotary cutting tool has a cutting edge on a tip portion, a side surface of the tip portion, and the like, and can perform cutting by rotating around a rotation axis.

Such a rotary cutting process is used for machining a mold. For example, when a chamfering process of 45 degrees is performed on a metal block using a rotating cutting tool with a tip angle of 90 degrees, the chamfering is performed by moving the rotating cutting tool in a vertical state.
Japanese Utility Model Publication No. 61-102403 (published June 30, 1986)

  However, the conventional rotary cutting method using a rotary cutting tool such as an end mill has the following problems.

  That is, in the cutting method using the rotary cutting tool described above, the chamfering of the crossing portion can be performed by moving the end mill so that the chamfering on the outer peripheral side of the metal block passes through the crossing portion as it is. As for chamfering on the inner circumference side, if the moving direction is simply changed to vertical at the intersection, the machining trace of the intersection will be rounded along the rotation of the end mill, and the chamfer at the intersection can be accurately performed. Can not. For this reason, in the conventional cutting method, regarding the chamfering of the intersecting portion on the inner peripheral side, the craftsman manually performs the chamfering after the machining by the end mill.

  The subject of this invention is providing the cutting method using the rotary cutting tool which can perform the process of the intersection part accurately and easily, when performing the chamfering process of an inner peripheral side.

The cutting method using the rotary cutting tool according to the first aspect of the present invention is a method of chamfering an object to be cut by a cutting blade inclined by X degrees with respect to a rotation axis provided at a tip portion by rotating about a rotation axis. This is a cutting method using a rotary cutting tool that performs chamfering at an angle of X degrees . In the first step, the rotary cutting tool is moved along the first edge portion on the inner peripheral side of the workpiece by the tip of the rotary cutting tool to chamfer the first edge portion. In the second step, the chamfering process is performed by moving the rotary cutting tool until the second edge portion that intersects the first edge portion reaches the intersection between the first edge portion and the second edge portion . In the third step, the tip of the rotary cutting tool, the first and second edge portions of the circle arc formed object to be cut by the cutting using the rotary cutting tool in a state in which the rotary cutting tool is stationary the intersection The intersecting portion is chamfered while the rotary cutting tool is lifted obliquely upward with respect to the workpiece so as to move toward the intersection of two parallel tangents .

  Here, a cutting method for chamfering a workpiece, particularly a chamfering process for a chamfer at an inner peripheral side is defined. Specifically, first, the cutting is advanced while cutting the tip portion of the rotary cutting tool to the crossing portion on the inner peripheral side. Then, cutting is performed while pulling up the rotary cutting tool in the direction of the intersection of two tangents of a circle formed on the surface of the workpiece by cutting with the rotary cutting tool from that position.

  As a result, it is possible to easily chamfer the intersecting portion on the inner peripheral side when performing chamfering, usually using a rotary cutting tool for performing circular cutting. As a result, it becomes possible to easily perform the chamfering process at the intersecting portion on the inner peripheral side, which is performed manually by a craftsman in the conventional method, using the rotary cutting tool.

  In addition, the said inner peripheral side shall mean the part where two edge parts which chamfer mutually cross | intersect inside each other.

  A cutting method using the rotary cutting tool according to the second invention is a cutting method using the rotary cutting tool according to the first invention, and the rotary cutting tool is an end mill.

  Here, the cutting method using the rotary cutting tool of the present invention can be applied to an end mill. Accordingly, it is possible to provide an end mill capable of easily performing chamfering processing, particularly chamfering processing at a crossing portion on the inner peripheral side.

  According to the cutting method using the rotary cutting tool according to the first invention, it becomes possible to easily perform chamfering at the intersecting portion on the inner peripheral side using the rotary cutting tool.

  According to the cutting method using the rotary cutting tool according to the second invention, it is possible to provide an end mill capable of accurately performing chamfering at the intersecting portion on the inner peripheral side.

[Configuration of end mill]
An end mill (rotary cutting tool) 10 according to an embodiment of the present invention is a tool that performs a cutting process on a metal block such as a mold, and is used by being set on a machine tool such as a milling machine. As shown in FIG. 1, the end mill 10 has two cutting edges 11a and 11b at the tip portion. The cutting edges 11a and 11b are arranged symmetrically with respect to the rotation axis at an angle of 45 degrees with respect to the rotation axis, respectively, and the tip angle D1 is 90 degrees.

  This tip angle D1 is an angle for chamfering 45 degrees on the edge portion of the metal block B with a rotary cutting tool such as the end mill 10 in a state where the rotation axis of the end mill 10 is vertically set. It is.

[This cutting method]
In the cutting method using the end mill 10 of the present embodiment, as shown in FIG. 2, the rotation axis of the end mill 10 is set with respect to the workpiece B 1 having a vertical edge portion constituted by a horizontal plane and a vertical plane. Cutting is performed by moving while making contact in a vertically standing state.

  The tip angle D1 of the end mill 10 is 90 degrees as described above. The two cutting blades 11a and 11b are arranged so that the angle α formed by the cutting blades 11a and 11b with respect to the rotation axis is 45 degrees. Therefore, when chamfering the edge portion of the workpiece with the chamfering angle of 45 degrees by the cutting edges 11a and 11b, the rotation axis of the end mill 10 is arranged to be parallel to the vertical direction as shown in FIG. Then, it is moved in the horizontal direction while making contact with the edge portion of the workpiece.

  Here, when performing the chamfering process as described above, the crossing portion X and the crossing portion Z on the inner peripheral side shown in FIG. 3A can be obtained by simply moving the end mill 10 to the crossing portions X and Z. X and Z are rounded along the rotation of the end mill 10.

  Therefore, in the cutting method using the end mill 10 of the present embodiment, as shown in FIG. 4, the end mill 10 is tilted from the X, Y, and Z axes by using an end mill having a predetermined tip angle D. A cutting method that enables pyramid processing by performing cutting while tilting only the angle D2 is applied.

  That is, using an end mill 10 with a predetermined tip angle D, as shown in FIG. 4, the machining is performed with the rotation axis of the end mill 10 tilted at an inclination angle D2 with respect to each axial direction. Then, by processing while pulling the end mill 10 in each axial direction shown in FIG. 4, pocket processing of a pyramid can be realized. In particular, when the tip angle D is 70.53 degrees and the inclination angle D2 is 54.74 degrees, the end mill 10 is moved in the XYZ axis directions to perform three-dimensional right angle machining (right triangle pyramid machining). Is possible.

  In the cutting method using the end mill 10 of the present embodiment, the chamfering is performed at the intersecting portions X and Z on the inner peripheral side by applying the pyramid processing using the rotary cutting tool as described above. Specifically, after the end mill 10 is moved to the intersections X and Z on the inner peripheral side (see FIG. 3A) (first step), the workpiece B2 is cut by the cutting edges 11a and 11b of the end mill 10. The end mill 10 is moved while being lifted vertically upward with respect to the direction of the intersection of the tangent lines of the circle formed in (2nd step).

  More specifically, in plan view, as shown in FIG. 3 (b), a tangent line of a circle (cross section of the end mill 10) centering on the rotation axis (in FIG. 3 (b), a chamfering line of the workpiece B2). ) The end mill 10 is moved toward the intersection point. And when it sees from a side surface, as shown in FIG.3 (c), it cuts, raising the end mill 10 diagonally upward 45 degree | times.

  3A, the chamfering of 45 degrees can be accurately performed up to the intersecting portions X and Z without forming a round processing mark along the rotation of the end mill 10 in the intersecting portions X and Z on the inner peripheral side shown in FIG. It can be carried out.

  In addition, the inner peripheral side demonstrated here does not show the inner side of a workpiece, but the side where two edge parts (a 1st edge part and a 2nd edge part) which chamfer process mutually cross | intersect mutually inside. Shall be shown. That is, the intersection X and the intersection Z shown in FIG. 3A correspond to the inner periphery, but the intersection Y where the edge portions intersect on the outside does not correspond to the inner periphery.

  Therefore, as shown in FIG. 2, the cutting edges 11a and 11b are moved in contact with the edge portion to chamfer the straight portion of the edge portion, and the intersection portions X and Z of the edge portion are as described above. In plan view, chamfering is performed by moving the end mill 10 toward the intersection of the tangents of the circle (cross section of the end mill 10) centered on the rotation axis (see FIGS. 3B and 3C), When the chamfering of the intersecting portions X and Z is completed, the end mill 10 is moved to the position where the orthogonal edge portions are chamfered again to chamfer the straight portions as shown in FIG. Thereby, it becomes possible to perform chamfering accurately and easily by the end mill 10 from the straight portion of one edge portion to the intersecting portion and the intersecting portion of the other intersecting edge portion. Therefore, it is possible to realize a chamfering process with significantly improved efficiency as compared with the conventional chamfering process method.

[Features of Cutting Method Using End Mill of Embodiment]
(1)
In the cutting method using the end mill 10 according to the present embodiment, as described above, as the first step, cutting is performed while moving until the tip of the end mill 10 comes to the intersection on the inner peripheral side. Then, as a second step, cutting is performed while the end mill 10 is lifted obliquely upward from the state where the end mill 10 is located at the intersecting portion to the position where the tangents of the circles of the workpiece B2 formed by the end mill 10 intersect. Processing.

  As a result, normally, when chamfering on the inner circumference side is performed using a rotary cutting tool such as the end mill 10, the intersection portion is rounded. According to the present invention, the intersection portion X on the inner circumference side can be accurately and accurately. Chamfering can be easily performed. Therefore, it is possible to perform chamfering with greatly improved processing efficiency compared to the conventional case.

[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.

(A)
In the said embodiment, the example which applied this invention with respect to the cutting method using the rotary cutting tool which chamfers using the end mill 10 was given and demonstrated. However, the present invention is not limited to this.

  For example, the present invention can be used as a cutting program for controlling the movement of the end mill 10 described in the above embodiment. In this case, it is possible to accurately and easily chamfer the intersecting portion by controlling the movement of the end mill 10 at the intersecting portion on the inner peripheral side in accordance with the contents of the above embodiment.

(B)
In the embodiment described above, an example in which the angle α formed by the cutting edges 11 a and 11 b attached to the tip of the end mill 10 with respect to the rotation axis is 45 degrees has been described. However, the cutting method using the rotary cutting tool of the present invention is not limited to this.

  For example, when the chamfer angle is 60 degrees, an end mill having a tip angle of 60 degrees can be used. In this case, by changing the angle at which the end mill is pulled up at the chamfered portion on the inner peripheral side, the chamfering process at the intersecting portion on the inner peripheral side can be performed using a rotary cutting tool such as an end mill, as described above. .

(C)
In the said embodiment, the end mill 10 was mentioned as an example and demonstrated as the rotary cutting tool to which this invention was applied. However, the present invention is not limited to this. For example, the present invention can be applied to other rotary cutting tools such as a drill. Further, the end mill 10 can be applied to various end mills such as a tapered end mill.

(D)
In the embodiment described above, the example in which the two cutting edges 11a and 11b are provided symmetrically with respect to the rotation axis at the tip of the end mill 10 has been described. However, the present invention is not limited to this. For example, even when the number of cutting blades is one or three or more, the same effect as described above can be obtained as long as the angle formed by the cutting blade with respect to the rotation axis is 45 degrees. .

(E)
In the said embodiment, the process with respect to metals, such as a metal mold | die, was mentioned and demonstrated as an example. However, the present invention is not limited to this. For example, it goes without saying that the present invention can also be applied to wood processing and resin processing.

  It can be widely applied to various cutting methods for chamfering using metal tools such as molding dies and metal parts, and chamfering using rotary cutting tools, especially chamfering at the intersection on the inner circumference. is there.

The side view which shows the end mill which concerns on one Embodiment of this invention. The schematic diagram explaining the chamfering process by the end mill of FIG. (A)-(c) is schematic which shows the procedure of the chamfering process using the end mill of FIG. The figure which shows the principle about the cutting method using the rotary cutting tool of this invention.

Explanation of symbols

10 End mill (Rotary cutting tool)
11a Cutting edge 11b Cutting edge B1 Workpiece B2 Workpiece D1 Tip angle X Intersection on the inner circumference side

Claims (2)

Cutting using a rotary cutting tool that performs chamfering on a workpiece with a chamfering angle of X degrees by a cutting blade inclined by X degrees with respect to the rotation axis provided at the tip portion by rotating around the rotation axis. A method,
A first step of chamfering the first edge portion by moving the rotary cutting tool along a first edge portion on an inner peripheral side of the workpiece by a tip of the rotary cutting tool;
A second step of chamfering the second edge portion intersecting the first edge portion, by moving the rotating cutting tool until the intersection between the first edge portion and second edge portion,
Tip of the rotary cutting tool is parallel to the first and second edge portions of the circle arc formed object to be cut in a state in which the rotating cutting tool in the intersecting portion is stationary by cutting using the rotary cutting tool A third step of chamfering the intersecting portion while raising the rotary cutting tool obliquely upward with respect to the workpiece so as to move toward the intersection of two tangents;
The cutting method using the rotary cutting tool provided with. The rotary cutting tool is an end mill;
A cutting method using the rotary cutting tool according to claim 1.

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