JPS6243685Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a cutter, and particularly to an improved structure of a cutter suitable for end face processing such as chamfering and deburring.

Conventionally, end-face processing such as removal of burrs and chamfering that occurs when processing a steel plate has been carried out using belt grinding, a grindstone, a brush, or the like. but,
Processing to reduce the width, such as deburring or chamfering, may be required. An example of a workpiece is a hoop material, the upper and lower surfaces of this hoop material are each insulated, the thickness of the workpiece is 0.3 mm, and the feed rate is
In order to perform deburring and chamfering with a width of 0.2 mm or less at speeds of 60 m/min or more, it has been impossible to perform processing using conventional belt grinding, grinding wheels, brushes, etc.

Therefore, conventionally, a cutter is used in which a ring-shaped cutting edge is fixed by soldering along the peripheral edge of a disc-shaped body. However, this conventional cutter has a problem in that thermal stress is generated during brazing, and the cutting blade material and the disc-shaped body have different coefficients of thermal expansion, which causes cracks in the cutting blade material.
Therefore, as a countermeasure, we selected materials with equal coefficients of thermal expansion for both materials, but the soldering process required skill and caused large thermal deformation, so it took a long time to grind to remove the thermal deformation after soldering. There were some drawbacks that required it. In addition, the cutting edge material and the disk-shaped body are limited to materials with the same coefficient of thermal expansion, which has the disadvantage of being expensive.

This invention provides a cutter structure to improve the above-mentioned conventional drawbacks.

The cutter according to this invention includes a disc-shaped body which is the main body of the cutter, a cutter attachment part provided in the center of the disc-shaped body, and a ring-shaped cutter along the periphery of the disc-shaped body. It is provided with a cutting edge portion which is fixed and made of a material with higher hardness than the disk-shaped body, and a notch portion in the radial direction of the disk-shaped body that divides the cutting edge portion.

Next, one embodiment of this invention will be explained in detail with reference to the drawings. First, FIG. 1 is a partially sectional side view showing how this cutter is used. In the figure, 1 is a cutter device, 2 is a support shaft elastically supported in the axial direction, which can freely rotate around the axis, and a cutter 3 is attached to the tip thereof. Further, reference numeral 10 denotes a workpiece, and the burr present on the edge 10a of the workpiece is to be removed. The cutter 3 moves its edge 1 as the workpiece 10 moves.
0a and slides in pressure contact with the force averaged by the spring 1a. Note that 1b is a screw for adjusting the elasticity of the spring, and 1c is a bearing.

Next, as shown in FIG. 2 is a front view of the cutter, and FIG. 3 is a side sectional view of the cutter taken along line A-A in FIG. A blade 4 is fixed to the boundary between one main surface of the disc-shaped body 31 and the outer peripheral surface 32 by brazing.
Then, leaving a certain width dimension from this blade 4, a flank 33 recessed from other parts is provided on the main surface to form a protruding cutting edge part 41. The blade 4 is ring-shaped along the periphery of the disc-shaped body, and has notches 5 in the radial direction of the disc-shaped body, and is divided into a plurality of parts (four divisions in the figure). The interval t between the notches 5 is a particularly important size when the thickness of the workpiece is thin.
It must be smaller than the thickness of the workpiece. By doing so, it is possible to prevent processing failures (for example, damage to the workpiece) due to the workpiece fitting into the notches 5 . Further, the cutting edge surfaces 42 of the cutting edge portions 41 are flat. Furthermore, an attachment portion 6 of this cutter is provided at the center of the other main surface of the disc-shaped body 31.
is provided. In the illustrated attachment part 6, a shaft hole 61 penetrating the above-mentioned flank 33 is bored in the boss part at the center of the main surface, and this shaft hole 61 is provided with a key groove 62 and a screw hole 63. The disk-shaped body 31 is attached and fixed to the support shaft 2 of the cutter device 1 (FIG. 1).

Since the cutter of the above embodiment is divided into cutting edge materials, thermal stress during brazing can be absorbed by the gap formed by the notch. Furthermore, the fact that it is divided into a plurality of cutting blades simultaneously functions as a chip breaker and breaks up the chips, which prevents accidents to workers caused by flowing chips and improves chip disposal. Furthermore, since the influence of thermal stress is small, the grinding work after brazing can be accomplished in a short time, which is a significant advantage.

In the above embodiment, the blade 4 in which the cutting edge surface 42 and the outer circumferential surface 32 are perpendicular to each other is illustrated, but this is shown in FIG.
It may be an acute angle α as shown in the cross-sectional view of the surrounding part) or an obtuse angle β as shown in FIG. The cutting edge portion 41 may be fixed by brazing, as an example. In this case, the spacing between the cutting edges is the same as in the case of fixing to the main surface side. Furthermore, the number of divisions of the cutting edge portion is not limited to the embodiments, and may be determined depending on the cutter diameter, brazing technique, etc.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view of a cutter device to which the cutter of this invention is attached, Fig. 2 is a front view of the cutter of an embodiment of the invention, and Fig. 3 is taken along line A-A in Fig. 2. FIGS. 4, 5, and 6 are side sectional views of a portion of a cutter according to another embodiment of this invention. 5... Notch, 31... Disc-shaped body (main body), 4
1... Cutting edge part.

Claims (1)

[Claims for Utility Model Registration] (1) A disc-shaped body and a plurality of notches along the periphery of the body, which are brazed in a ring shape and are used to cut the end face of a workpiece. A cutter characterized by comprising a blade part. (2) The cutter according to claim 1 of the utility model registration, characterized in that the length along the peripheral edge of the notch is set to be smaller than the thickness of the workpiece.