TWI408019B - Cutter for chamfering - Google Patents

Abstract

The present invention aims to provide a cutter for chamfering that improves the ability to deal with the chips created during the chamfering work and thus reduces cutting load. To achieve the above objective, an aspect of the present invention provides a cutter for chamfering, which may be connected to a rotating shaft so as to rotate and trim an edge of an object. The cutter may have a through-hole (10) formed in its center, so that a fastening bolt inserted through the through-hole (10) may connect the cutter to one end of the rotating shaft; the cutter may be shaped as a cogwheel having a multiple number of cutting blades (20) that are positioned radially about the through-hole (10) and formed as an integrated body; the cutting blades (20) may be shaped to generally protrude towards the center, with each of the blades including a blade portion (32, 42), which is formed in an end part of the cutting blade (20) in a direction of rotation, and an arc (34, 44) portion, which forms a concave arced surface; and the cutting blades (20) may include finish-grinding blades (30) and rough- grinding blades (40) that are positioned alternately, the finish-grinding blades (30) having smooth surfaces on the arc portions (34), and the rough-grinding blades (40) having rough surfaces on the arc portions (44). According to the present invention, the ability of the chamfering cutter to handle chips can be improved, and the cutting load can be lowered, so that the chamfering work can be facilitated, the work speed can be increased, and the durability of the chamfering cutter can be prolonged.

Description

Chamfer cutter

The present invention relates to a chamfering machine, and more particularly to a chamfering cutter that utilizes a rotational force and can be coupled to a chamfering tool.

Chamfering (or beveling) refers to the angle at which an object is milled or the angle of a tool or engraved into a slant or circle, and the means used to perform the chamfering is called a chamfering tool.

Although there are different types of chamfering tools that perform chamfering operations in various ways, a representative practice is to perform chamfering by rotating using a chamfer cutter mounted at the end of a rotating shaft.

When such a chamfering tool is used, cutting debris (chips) generated by the rotational force may cause problems. If the cutting chips produced by the chamfer cutting are long, the cutting chips may be entangled on the chamfering tool that rotates at a high speed, which is not advantageous for the chamfering process. Even small cutting chips, if the cutting chips are not quickly removed, may increase the cutting load, which is not only difficult to continue the chamfering work, but also reduces the durability of the chamfering knife.

In order to solve the problem of cutting chips generated during chamfering, various prior art techniques have been developed, such as a way of forming a recessed discharge in a chamfer cutter, but these efforts have not been particularly effective.

The present invention has developed a chamfering cutter that solves the above problems in order to improve the efficiency in processing the chamfering of cutting chips, thereby reducing the cutting load.

A chamfer cutter according to the present invention can be coupled to a rotating shaft for rotating and trimming the edges of an object. The cutter has a central through hole, and the cutter is coupled to one end of the rotating shaft by a fixing bolt inserted through the through hole; the cutter has a plurality of radial holes disposed along the through hole and a blunt gear-like structure formed by the integrally formed cutting insert; the cutting insert has a shape protruding from a center, and each cutting insert includes a cutting insert portion and an arcuate portion, the cutting insert portion Forming an end portion in a rotational direction of the cutting insert, and the curved portion forms a concave curved surface; and the cutting insert includes a fine grinding blade and an alternating rough grinding blade, the fine grinding blade having an arc-shaped portion A smooth surface, and the coarse sanding blade has a rough surface in the curved portion.

The advantage of the present invention is that a cutting chip breaking structure is formed at the end of the curved portion connected to the cutting insert portion, and the cutting chip breaking structure has a double angle shape.

Further, in the through hole, a positioning portion having a conical shape is formed, and the positioning portion has a structure in which the head end of the fixing bolt is caught.

The invention can improve the performance of the chamfering cutter in processing the cutting debris, and can reduce the cutting load, contribute to the chamfering cutting, can promote the working speed, and prolong the durability of the chamfering cutter.

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

1 is a perspective view showing an embodiment of a chamfering cutter according to the present invention, FIG. 2 is a front view showing a chamfering cutter of FIG. 1, and FIG. 3 is a cross-sectional view taken along a line A-A' of FIG. Figure 4 is a rear elevational view showing the chamfer cutter of Figure 2.

As shown in FIG. 1 and FIG. 2, the chamfering machine of the embodiment of the present invention includes a central through hole 10 through which a rotating shaft of the safety knife can be inserted by a fixing bolt, and a fixing through the through hole is inserted. The chamfering machine can be combined with a rotating shaft by bolts. The tool may be in the shape of a cogwheel, having a plurality of cutting inserts 20 that are radially surrounding the through hole 10. The number of cutting inserts 20 may range from 5 to 8, and in the present embodiment, six cutting inserts are described as an example. As in Figures 1 and 3, each of the cutting inserts 20 projects outwardly from the center.

Each cutting insert 20 includes a cutting insert portion 32, 42 formed at one end of the direction of rotation in which the cutting operation is performed, an arcuate portion 34, 44 extending from the cutting insert portion 32, 42 and A concave curved surface is formed. Further, the thickness of the section of each of the cutting inserts may be decreased from the cutting insert portion toward the opposite direction of rotation such that the thickness of the cut portion bonded to the next cutting insert is the thinnest. The blade portions 32, 42 of the cutting insert are formed to be tiltable at a particular angle relative to the diametrical direction of rotation.

The cutting insert 20 can be classified into two types, a fine sharpening insert 30 and a coarse sharpening insert 40, depending on the manner in which the curved portions 34, 44 are treated, and the positions of the two types of inserts 30, 40 can be interchanged. The sharpening blade 30 has a smoothed curved portion 34 to perform a finishing operation, while the coarse sharpening blade 40 has a roughened curved portion 44.

Fig. 5 is a cross-sectional view taken along the line B-B' of Fig. 2; At the end of the arcuate portion 34 attached to the cutting insert portion 32, a cutting chip breaking structure 36 can be formed which can be processed to have a double angled cross section. The cutting chip breaking structure 36 may be formed at a portion connected to the cutting insert portion 32 at an angle smaller than that of the curved portion 34. This structural design of the cutting chip breaking structure 36 can reduce the size of the cutting chips during the chamfering operation, and can reduce the cutting load by about 30% because the cutting chips can be immediately removed.

Fig. 6 is a cross-sectional view showing various possible shapes of the arcuate portion of the rough sharpening blade shown in the portion "C" in Fig. 3. The rough sharpening blade 40 has a plurality of different cross sections as shown, which can be impractical for high precision work such as fine grinding, but can reduce the size of the cutting chips during chamfering and greatly reduce the cutting. load.

Therefore, by replacing the rough grinding blade 40 with a chamfering machine having the fine grinding blade 30 having the cutting chip breaking structure 36, it is possible to reduce the cutting load by about 60% compared to the normal chamfering blade. Further, as shown in Fig. 3, the chamfering machine according to the embodiment of the present invention may include a positioning portion 12 having a conical shape whose diameter is gradually reduced rather than a structure having an orthogonal stepped cross section. The head end of the fixing bolt coupled to the through hole 10 can be caught in the positioning portion 12. If the positioning portion 12 is designed as a stepped structure as in the prior art, the head end of the fixing bolt may not uniformly contact the positioning portion, so when a bolt is used, The bolting force may not be very large and a separate gasket may be required. However, according to an embodiment of the present invention, if the tapered positioning portion 12 is used, it is possible to ensure that the contact area with the bolt having a correspondingly shaped head end can be greatly improved, so that the positioning force is also greatly increased.

The invention has been described in the above embodiments. However, the above description is only for the preferred embodiment of the present invention, and those skilled in the art can make other improvements according to the above description, but these changes still belong to the creative spirit of the present invention and the following definitions. In the scope of patents.

10‧‧‧through hole

12‧‧‧ Positioning Department

20‧‧‧Cutting inserts

30‧‧‧ fine grinding blade

40‧‧‧Rough grinding blade

32, 42‧‧‧ cutting blade part

34, 44‧‧‧ curved part

36‧‧‧ Cutting chip breaking structure

1 is a perspective view showing an embodiment of a chamfering cutter according to the present invention; FIG. 2 is a front view showing a chamfering cutter of FIG. 1; and FIG. 3 is a cross-sectional view taken along a line A-A' of FIG. 2; Figure 4 is a rear view showing the chamfering cutter of Figure 2; Figure 5 is a cross-sectional view taken along line B-B' of Figure 2; and Figure 6 is a section showing the portion "C" of Figure 3 A cross-sectional view of various possible shapes of the curved portion of the illustrated coarse sanding blade.

10. . . Through hole

12. . . Positioning department

20. . . Cutting insert

30. . . Fine grinding blade

32. . . Cutting blade part

34. . . Curved part

36. . . Cutting chip breaking structure

40. . . Rough grinding blade

42. . . Cutting blade part

44. . . Curved part

Claims (2)

A chamfering cutter coupled to a rotating shaft for rotationally cutting an edge of an object, wherein: the cutter has a central through hole, and the cutter is coupled by a fixing bolt inserted through the through hole One end of the rotating shaft; the cutter has a plurality of cogwheel-like structures formed by a radially disposed and integrally formed cutting insert along the through hole; the cutting blade has a shape protruding from a center, each The cutting insert includes a cutting insert portion and an arcuate portion, the cutting insert portion being formed at an end portion of the cutting insert in a rotational direction, and the arcuate portion forming a concave curved surface connected to An end of the curved portion of the cutting insert portion is formed with a cutting chip breaking structure, and the cutting chip breaking structure has a double angle shape; and the cutting insert comprises a fine grinding blade and an alternating rough grinding blade, The sharpening blade has a smooth surface in the curved portion, and the rough sharpening blade has a rough surface in the curved portion. A chamfering cutter according to claim 1, wherein a positioning portion having a conical shape is formed in the through hole, and the positioning portion has a structure for plunging the tip end of the fixing bolt.