JP2006043805A - Cutting tool, a method of forming two or more cylindrical projection using the cutting tool and support having the cylindrical projections - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting tool, forming a cylindrical projection in a plate-like workpiece using a cutting device such as a milling machine or a machining center, to provide a cutting method for forming two or more cylindrical projections using the cutting tool, and to provide a support formed by the cutting tool and the cutting method. <P>SOLUTION: This cutting tool 10 is constructed by a main body part 11 held on a main shaft as a rotary driving part of the milling machine, and a cutting edge part 12 provided on the tip face 11a. A knife edge 12a is formed as a bottom blade on the forward end of the cutting edge part 12 parallel to the axis Y and the tip face 11a in a position at a predetermined distance L1 from the tip face 11a and at a predetermined distance L2 from the axis Y. The axis Z side of the knife edge 12a is provided with an inner starting end part 12b in a position at a distance L3 from the axis Z. The distance L3 is the radius of the cylindrical projection B10 to be formed in a workpiece 50. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cutting tool for forming cylindrical protrusions on a flat workpiece using a cutting device such as a milling machine or a machining center, and a cutting method for forming a plurality of cylindrical protrusions using the cutting tool, and The present invention relates to a support base formed by the cutting tool and the cutting method.

  When trying to machine a cylindrical projection on a flat workpiece using a milling machine, conventionally, the end mill center axis (rotation center) is to be machined while the end mill having a predetermined cutting diameter is rotated. The method of revolving around the cylindrical projection is used. FIG. 7 shows an outline of the processing method.

  When the cylindrical protrusion B1 having the diameter D10 and the height L10 is formed on the flat workpiece 50, the end mill E1 is moved so that the outer peripheral edge E2 of the end mill E1 moves to the position that becomes the outer peripheral surface B2 of the cylindrical protrusion B1. Is rotated around the central axis BC of the cylindrical protrusion. In this case, the bottom blade E3 is positioned so that the depth from the surface of the workpiece 50 is L10, and the cutting is performed.

  However, this method has the following problems. That is, when the end mill is revolved and cut in this way, the movement becomes complicated and accuracy is likely to appear.

  Moreover, since the outer periphery B2 of the protrusion is cut by the outer peripheral edge E2 provided on the side surface of the end mill, burrs are easily generated between the upper surface B3 and the outer periphery B2 of the columnar protrusion B1, and this must be removed manually. Will be needed.

  In particular, since the end mill E1 revolves around the cylindrical protrusion B1 to form the cylindrical protrusion B1, the amount of movement of the end mill E1 is large, and it takes a long processing time to form one cylindrical protrusion. turn into.

  When a plurality of such columnar protrusions B1 are to be formed in a matrix, for example, the position variation becomes large or the cutting time is very long. Furthermore, if the cylindrical protrusion is used to accurately support the article, burrs and remaining cuttings between the cylindrical protrusions must be removed, and the time required for post-processing becomes very long.

Further, a cutting tool for forming cylindrical protrusions is disclosed in Japanese Patent Laid-Open No. 09-262712. The tip of the cutting tool disclosed in this document is designed to cut the periphery of a cylindrical protrusion, and as a preliminary cutting, a cylindrical protrusion having a large diameter is first formed by an end mill as shown in FIG. Then, the periphery is cut away to form a predetermined radius. Therefore, it takes more time than the method shown in FIG.
JP 09-262712 A

In order to solve these problems, the present invention comprises a main body for rotating around a predetermined axis and being held by a main shaft of a machine tool and a cutting blade for cutting, as described in claim 1. The blade portion is on a plane perpendicular to the predetermined axis, the blade edge formed between the inner starting end portion at a position where the distance from the predetermined axis is equal to the radius of the cylindrical protrusion to the outer terminal portion, It is set as the cutting tool containing the inner blade formed in the said main body direction above from an inner side start end part.

  With such a cutting tool, a cylindrical protrusion is formed by the cutting edge and the inner cutting edge of the surface perpendicular to the rotation axis.

  Further, for example, in the case of forming a plurality of cylindrical protrusions, the cutting tool is a cutting tool for forming a plurality of cylindrical protrusions at a predetermined interval P on a flat plate-like workpiece as defined in claim 2. A main body that rotates around an axis and is held by a main spindle of a machine tool and a cutting blade part, and the cutting edge part is a distance from the predetermined axis on a plane perpendicular to the predetermined axis. A cutting edge formed between the inner starting end portion of L3 which is equal to the radius of the cylindrical protrusion and the outer end portion having a distance of L4 from the predetermined axis, and toward the main body above the inner starting end portion. When the same distance from the center of the plurality of cylindrical protrusions is L, and the inner blade is formed,

              L <L4 <P-L3

It is a cutting tool.

  When a plurality of cylindrical projections are formed by the method according to claim 3 using this tool, the outer terminal ends of the blade edge cut the portions of the same distance from the centers of the plurality of cylindrical projections. No cutting residue occurs between them.

  Further, when a plurality of columnar protrusions are formed as in the fourth aspect, matrix columnar protrusions can be formed.

  When a cylindrical protrusion having a predetermined diameter is formed on a flat plate-shaped workpiece by the cutting tool according to the present invention, it can be formed with high accuracy, the processing time can be shortened, and no burrs are generated, so that the deburring operation time is not required. .

  Furthermore, when it is going to form two or more this cylindrical protrusion, since there is no cutting residue between a cylindrical protrusion and a cylindrical protrusion, the operation | work which removes them becomes unnecessary. In addition, since a flat surface can be formed between the columnar projections and the columnar projections, it is possible to form a columnar projection with a low height, and it is not necessary to perform a finishing process between the columnar projections and the columnar projections. Time can be shortened.

  Moreover, according to the cutting tool and cutting method by this invention, the support stand using a some cylindrical protrusion can be formed efficiently with sufficient precision.

  And the support stand produced by the cutting tool and the columnar projection forming method according to the present invention can be made with high accuracy.

  An embodiment of the present invention will be described with reference to FIGS.

  1 shows a cutting tool 10 of the present invention, FIG. 1 (a) is a front view thereof, FIG. 1 (b) is a side view thereof, and FIG. 1 (c) is a bottom view thereof.

  In the figure, axis Z, axis X, and axis Y are used to facilitate the explanation of the present invention. The axis Z is a rotation axis of the cutting tool 10, and the axis X and the axis Y are surfaces orthogonal to the axis Z. Indicates the reference axis.

  The cutting tool 10 includes a main body 11 that is held by a main shaft, which is a rotation drive unit of a machine tool, for example, a milling machine, and a blade 12 that is provided on a tip surface 11a thereof. The main body 11 is formed in a columnar shape centered on the axis Z, and the tip surface 11a is a surface orthogonal to the axis Z. An intersection point of the tip surface 11a with the axis Z is defined as an intersection point O of the axis X and the axis Y.

  Of course, the main body 11 may have a cylindrical shape or a conical shape.

  The main body portion 11 and the blade portion 12 are integrally formed of the same material. Moreover, the blade part 12 can also be formed so that it may attach to the front end surface 11a by welding.

  A blade edge 12a is formed on the distal end side of the blade portion 12 as a so-called bottom blade at a position parallel to the axis X and the distal end surface 11a and a predetermined distance L1 from the distal end surface 11a and a predetermined distance L2 away from the axis X. On the axis Z side of the blade edge 12a, an inner starting end portion 12b is provided at a distance L3 from the axis Z. This distance L3 is the radius of the columnar protrusion B10 to be formed on the workpiece 50.

  The cutting edge 12a rotates in the direction of arrow T shown in FIG. 1 (c) and moves in the axis Z and downward in the drawing to cut the workpiece 50 (see FIG. 1 (a)). The cutting edge 12a is formed with a clearance angle α1 and a rake angle α2 in order to improve machinability. The distance L2 between the blade edge 12a and the axis X is also for improving the machinability.

  An inner blade 12c is formed from the inner starting end portion 12b of the blade tip 12a to the upper tip surface 11a (see FIG. 1 (A)). The inner blade 12c has a cutting edge formed by a rake angle α2 and a clearance angle α3. By the way, in order to make the cylindrical protrusion B10 into a truncated cone shape, the inner blade 12c may be inclined with respect to the axis Z.

  The blade tip 12a is also formed with an outer terminal portion 12d so as to be located at a distance L4 from the axis Z. A cutting blade (outer peripheral blade 12e) is also provided at the outer peripheral portion.

  In particular, when the cutting tool is formed by an end mill as will be described later, an outer peripheral blade of the end mill can be used.

  Next, with reference to FIG. 2, the state which forms the cylindrical protrusion B10 to the flat plate-shaped workpiece 50 with this cutting tool 10 is demonstrated.

  The workpiece 50 is, for example, an aluminum plate having a flat surface, and is fixed to a table of a machine tool, for example, a table such as a milling machine, so that the surface is perpendicular to the axis Z that is the moving direction of the cutting tool 10. Further, the main body 11 of the cutting tool 10 is also held by a main shaft of a machine tool, for example, a main shaft which is a rotational drive unit of a milling machine.

  Here, when the cutting tool 10 is moved downward by a predetermined distance from the position where the cutting edge 12a touches the surface of the workpiece 50, the cylindrical protrusion B10 having a radius L3 (diameter 2 × L3) about the axis Z. Is formed with a high amount of movement in the axis Z direction.

  At this time, a groove 60 having a radius L4 and a difference between L4 and L3 around the cylindrical protrusion B10 is formed around the cylindrical protrusion B10. The surface of the groove 60 is a flat surface because the cutting edge 12a is parallel to the axis X.

  In order to make the cylindrical protrusion B10 into one protruding portion, the periphery of the groove 60 may be further cut by an end mill or the like as much as its depth.

  FIG. 3 is a side view of the machining state of FIG. Since the inner blade 12c and the blade edge 12a continuously cut the workpiece 50, there is no discontinuous blade contact as in the prior art, and cylindrical projections can be formed with high accuracy.

  Further, no burr is generated between the upper surface B13 and the outer peripheral surface B12 of the cylindrical protrusion B10 by the blade edge 12a and the inner blade 12c. Furthermore, if the rake angle α2 is set to an appropriate value corresponding to the material of the workpiece 50, the blade tip 12a and the inner blade 12c can reliably ensure that there is no burrs between the upper surface B13 and the outer peripheral surface B12 of the cylindrical projection B10. Does not occur.

  Next, a case where a plurality of cylindrical protrusions B10 are continuously formed with this cutting tool 10 will be described with reference to FIG.

  The columnar projections B10, B11, B12..., B20, B21, B22... Are formed so as to be arranged in a matrix in the axis X and axis Y directions at a predetermined interval P1. At this time, the radius of the cylindrical protrusion B10 is L3, and the height is L5. A point equidistant from four adjacent cylindrical protrusions (for example, B10, B11, B20, and B21) is Q1, and a distance from each cylindrical protrusion to the point Q1 is L5.

  Thus, in order to form a plurality of cylindrical protrusions B10, the cutting edge shape of the cutting tool 10 is set as follows.

              L5 = {(√2 × P1) / 2} <L4 <P1-L3

  First, B10 is formed as shown in FIGS. That is, the cutting edge 12a is moved toward the workpiece 50 while rotating the tool in accordance with the center O1 of the columnar protrusion B10 which is to form the position of the rotation axis (axis Z) of the cutting tool 10, and the cutting edge 12a is moved to the workpiece. The cutting tool 10 is further moved by L10 in the axis Z direction from the point of contact with the surface of the processing member 50.

  When the circumferential groove 60 having the depth L10 is dug and the cylindrical protrusion B10 is formed, the cutting tool 10 is moved in the axis Z direction so as to be separated from the workpiece 50.

  Next, the workpiece 50 or the cutting tool 10 is moved by the distance P1 in the axis Y direction, and the cylindrical projection B11 is formed in the same manner as the cylindrical projection B10 is formed.

  After forming a desired number of cylindrical projections B10, B11, B12... In the axis Y direction, the cutting tool 10 is moved by a distance P1 in the axis X direction, and the cutting tool 10 is formed while forming cylindrical projections. Is moved in the negative direction of the axis Y to form a desired number of cylindrical protrusions... B22, B21, B20.

  In this way, a matrix-like columnar projection group as shown in FIG. 4 is formed on the flat plate-like workpiece 50. When the adjacent cylindrical protrusions B10, B11, B21, and B20 are formed, when the shape of the cutting edge 12a of the cutting tool 10 satisfies the above formula 1, the cutting edge 12a has the center of the diagonal among the four cylindrical protrusions. An intersection of connecting lines (a point having an equal distance L5 from each cylindrical protrusion) Q1 always passes through, and no cutting residue is generated between the four cylindrical protrusions. (In the figure, the dotted line indicates the locus of the outer terminal end 12d)

  When the columnar projections are formed in a matrix, no cutting residue occurs between the columnar projections except for the outer cylindrical projection periphery S (hatched portion), so that the cutting process in the subsequent process is minimized. It will be limited.

  Further, since the blade edge 12a is perpendicular to the axis Z, a flat surface between the columnar protrusion and the columnar protrusion has no step or inclination. Therefore, a cylindrical protrusion having a low height can be formed.

  The above describes the case where the cylindrical protrusions are arranged so as to have a predetermined pitch with reference to two orthogonal axes (axis X and axis Y), but as shown in FIG. A case where a plurality of cylindrical protrusions are arranged to be positioned is also conceivable. (At this time, the pitch in the direction of the axis X is P3)

  In this case, when a point where the distances from the three cylindrical protrusions B30, B31 and B32 are equal is Q2, and a distance from the point Q2 to each cylindrical protrusion is L6, L4 of the cutting tool 10 is expressed by the following equation. With this setting, no cutting residue is generated between the cylindrical protrusions.

             L6 = (P2 / √3) <L4 <P2-L3

  FIG. 5 shows an embodiment in which the cutting tool of the present invention is formed by an end mill. FIG. 5 (a) is a front view thereof, FIG. 5 (b) is a side view thereof, and FIG. 5 (c) is a bottom view thereof. The same components as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  This cutting tool 100 is a two-blade end mill having a body diameter and a bottom blade diameter of 8 mm. The cutting tool 100 is rotated around a rotation axis Z2, and a single blade is removed so as to cut 2 mm, thereby forming a blade portion 112. . As with the cutting tool 10 shown in FIG. 1, the blade portion 112 is formed with a blade edge 12a offset by 0.2 mm from the axis X2, and an inner blade 12c is formed perpendicular to the blade edge 12a and parallel to the rotation axis Z2. .

  A distance L3 between the inner start portion 12b and the rotation axis Z2 is 0.5 mm. The cutting tool 100 forms a cylindrical protrusion having a diameter of 1 mm.

  The blade portion 112 is provided with an outer blade 12e using the outer blade of an end mill. The distance L4 from the axis Z2 to the outer terminal end 12d is 4 mm.

  Further, the rake angle and clearance angle of each blade are set to 10 degrees for α1, 20 degrees for α2, and 10 degrees for α3.

  For example, in order to create a table on which a glass plate for a liquid crystal television set is placed, a cylindrical projection having a diameter of 1 mm (L3 = 0.5) and a height of 0.2 mm is formed on an aluminum flat plate of about 2 m square with a pitch of 5 mm (P = 5) It is necessary to form hundreds of thousands in a matrix.

  The distance L4 between the outer end portions 12d of the cutting tool 100 is 4 mm. When each numerical value is applied to the mathematical formula, 3.5 <L4 <4.5 is obtained, and it is understood that when the matrix-shaped columnar projection group is formed using the cutting tool 100, there is no remaining cutting between the columnar projections. . And since the blade edge | tip 12a is right-angled with the rotating shaft of the cutting tool 100, even if the height of a cylindrical projection is as small as 0.2 mm, it can form a cylindrical projection without flattening by post-processing.

  In the above-described embodiment, a two-blade end mill is used as the cutting tool. However, an end mill using a so-called throw-away tip for the blade portion 12 may be used.

  Further, the place related to the cutting conditions such as the rake angle and clearance angle of each blade can be appropriately determined depending on the material of the workpiece, the size of the columnar protrusion, and the like.

  According to the cutting tool of the present invention, the cylindrical protrusion can be formed with high accuracy. However, in order to further improve the accuracy, the cylindrical protrusion may be formed high, and then the top portion thereof may be post-processed by grinding or the like.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the cutting tool of this invention, (A) is the front view, (B) is the side view, (C) shows the bottom view. It is a perspective view which forms a cylindrical protrusion using the cutting tool of this invention. It is the figure which looked at the perspective view shown in FIG. 2 from the side. It is a figure which shows the state which formed the some cylindrical protrusion in the matrix form using the cutting tool of this invention. It is a figure which shows the state formed using the cutting tool of this invention to position a some cylindrical protrusion on the vertex of an equilateral triangle. It is the figure which showed the state used as the cutting tool of this invention using an end mill. It is the figure which showed the state which forms a cylindrical protrusion by the conventional method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Cutting tool, 11 ... Main-body part, 12 ... Blade part, 12a ... Blade edge, 12b ... Inner edge part,
12c ... inner blade, 12d ... outer terminal portion, B10 ... cylindrical protrusion.

Claims (6)

  A cutting tool for forming a cylindrical protrusion on a flat plate-shaped workpiece, comprising a main body for rotating around a predetermined axis and being held by a main spindle of a machine tool, and a cutting blade for cutting, The blade portion is on a plane perpendicular to the predetermined axis, the blade edge formed between the inner starting end portion at a position where the distance from the predetermined axis is equal to the radius of the cylindrical protrusion to the outer terminal portion, The cutting tool characterized by including the inner blade formed toward the said main body direction upward from an inner side start end part. A cutting tool for forming a plurality of cylindrical protrusions at a predetermined interval P on a flat workpiece, a main body for rotating around a predetermined axis and being held by a main spindle of a machine tool, and a cutting blade The blade portion is on a plane perpendicular to the predetermined axis, and the distance from the inner start end portion of L3 where the distance to the predetermined axis is equal to the radius of the cylindrical protrusion is L4 When the cutting edge formed between the outer terminal portion and the inner blade formed in the direction of the main body above the inner starting end portion is equal to L from the center of the plurality of cylindrical protrusions ,
L <L4 <P-L3
A cutting tool characterized by that.   3. The cutting tool according to claim 2, wherein a cylindrical protrusion is formed at a predetermined position of a flat plate-shaped workpiece, and the next cylindrical protrusion is formed at a predetermined interval P in a predetermined direction. A method of forming a plurality of columnar protrusions, comprising forming cylindrical protrusions.   A cylindrical protrusion is formed at a predetermined position of the flat plate-shaped workpiece, the next cylindrical protrusion is formed at a first predetermined interval in one direction, and a desired number of cylindrical protrusions are formed in one direction by the same process. 4. A plurality of cylindrical protrusions are formed by forming a cylindrical protrusion at a second predetermined interval in a direction perpendicular to one direction, and forming a desired number of cylindrical protrusions in a direction opposite to the one direction by a similar process. Columnar protrusion forming method.   5. The method of forming a plurality of columnar protrusions according to claim 4, wherein the first predetermined interval is equal to the second predetermined interval, and the plurality of columnar protrusions are formed in a matrix.   A support base created by the columnar protrusion forming method according to claim 4.

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