JP2021053794A - Router end mill - Google Patents

Abstract

To provide an economical router end mill for use in both shallow groove machining and deep groove machining, that is superior in shallow groove machining of a door or the like to which paper adhesion or sheet adhesion is applied on wood, and that prevents burns on a material by improving brushing-off of chips during deep groove machining, and has both durability equal to or longer than that of a diamond tip and solid carbide cutting skin.SOLUTION: Provided is a router end mill 1 comprising a positive lead blade 3 and reverse lead blades 4A-4C at a lower end of a shank part 2, in which the width of a spiral groove 5 of the positive lead blade is formed to be wider than spiral grooves 6A-6C of the reverse lead blades. In the router end mill, the positive lead blade 3 has a cutting blade part from a tip of a blade bottom 3A to a vicinal position, whereas the reverse lead blades 4A-4C have a cutting blade part from a vicinal position of the tip of the blade bottom 3A of the positive lead blade 3.SELECTED DRAWING: Figure 1

Description

The present invention mainly relates to a blade used for processing a wood-based board having a decorative coating on the surface.

When processing wood-based boards with decorative coating on the surface, diamond split blade end mills (routers) with diamond chips brazed to iron-based materials and end mills made of cemented carbide are generally used for woodworking. It is attached to the machine and used.

Japanese Patent Application Laid-Open No. 10-146713 JP-A-2007-118151

The above-mentioned diamond split blade end mill is described in Patent Document 1, for example, but since the blade portion is formed by dividing the diamond tip into a plurality of pieces, the overlapping portion of the diamond tip is a plurality of streaks on the material. In some cases, it was necessary to finish with another blade again. Further, since the material of the shaft portion is generally iron, which has low rigidity and easily touches the shaft, and the diamond tip is hard, the blade is liable to be chipped due to the runout of the blade. Further, since the tip is hard, it is difficult to increase the rake angle of the blade, and there is also a problem that the finish of the material is not very good. Further, since the diamond tip is brazed to the shaft body, it is difficult to manufacture a small diameter end mill having a diameter of 10 mm or less due to the shaft body area.

Further, although an end mill made of a cemented carbide material is described in Patent Document 2, for example, it has a structure in which cutting chips fly downward during drilling and grooving, so that the end mill may be formed at the bottom of a hole or groove during material machining. Cutting chips tend to collect, causing material burns and cutting edge wear due to cutting heat. In addition, the cutting edge of the positive lead blade is generally formed up to a position of 5 mm or more from the tip of the bottom blade, and when a shallow groove with a groove depth of 5 mm or less is machined, the positive lead is formed. Since the blade lifts the material upward, it also causes the sheet to turn over on the surface of the material. Furthermore, when it comes to machining difficult-to-cut materials (MDF, particle board), the blade material is significantly inferior to diamond in blade holding.

In order to solve the above problems, the router end mill of the present invention is a router end mill provided with a forward lead blade and a reverse lead blade at the lower end of the shank portion, and the width of the spiral groove of the positive lead blade is the reverse lead blade. The positive lead blade has a cutting edge portion from the tip of the bottom blade to a nearby position, and the reverse lead blade has a cutting edge portion from a position near the tip of the bottom blade of the positive lead blade. The cutting edge portion of the positive lead blade is formed at a position of 1 to 4 mm from the tip of the bottom blade, and the cutting edge portion of the reverse lead blade is 0.5 to 3 mm of the tip of the bottom blade of the positive lead blade. It is formed from the position, and the depth of the spiral groove of the forward lead blade is deeper than that of the spiral groove of the reverse lead blade.

The router end mill of the present invention is provided with a forward lead blade and a reverse lead blade at the lower end of the shank portion, and the cutting edge portion of the positive lead blade is formed at a position from the tip of the bottom blade to 1 to 4 mm, and the cutting blade of the reverse lead blade. By forming the part from the position of the tip of the bottom blade of the positive lead blade from 0.5 to 3 mm, the reverse lead blade has a pressing action even when shallow groove processing is performed with a groove depth of 5 mm or less of the material. By doing so, it is possible to suppress the turning of the wood surface that has been pasted with paper or sheet.

In the router end mill of the present invention, the width of the spiral groove of the positive lead blade is formed wide, and the spiral groove of the reverse lead blade is formed narrow so that cutting chips are discharged to the upper part from the spiral groove of the positive lead blade to perform deep groove machining. Even in this case, cutting chips do not collect at the bottom of the groove, and it is possible to prevent the cutting edge from being worn due to burning of the material and cutting heat, and both shallow groove processing and deep groove processing can be used.

The router end mill of the present invention is integrally molded with a cemented carbide, and by applying a diamond coating to the forward lead blade and the reverse lead blade, it is possible to maintain durability equal to or higher than that of a diamond tip. Further, since the shaft portion is also cemented carbide, the rigidity is increased, so that the shaft is less likely to run out and the blade is less likely to be chipped due to the runout of the blade, and the rake angle of the blade can be easily increased to improve the finish of the material.

Since the reverse lead blade of the router end mill of the present invention is formed of a single blade instead of a split blade, no streaks appear on the material during processing, and there is no need to perform finishing processing with another blade again.

Since the router end mill of the present invention is machined from a solid carbide round bar, it is possible to manufacture a router end mill having a diameter of 10 mm or less, for example, a diameter of 3 mm.

It is a side view which shows the router end mill of this invention.

Hereinafter, embodiments of the router end mill according to the present invention will be described with reference to FIG.

As shown in FIG. 1, the router end mill 1 of the present invention is formed by cutting out a solid carbide round bar, and has a shank portion 2 having a substantially round bar shape and a required length. A forward lead blade 3 and reverse lead blades 4A to 4C are formed at the tip of the shank portion 2.

As shown in FIG. 1, a spiral groove 5 of the positive lead blade is formed on the surface of the positive lead blade 3. A plurality of spiral grooves 5 (two in the present embodiment) are formed in the axial circumferential direction of the positive lead blade. The positive lead blade 3 is formed in a spiral shape, and the blade is formed from the tip of the blade bottom 3A of the positive lead blade 3 to a position 1 to 4 mm. The spiral groove 5 of the positive reed is provided with a wide and deep groove so that cutting chips are discharged to the upper part. Since the spiral groove 5 of the positive reed has a spiral shape formed in the axial direction, cutting chips are discharged to the upper part even when holes are drilled from top to bottom, so that material burning can be prevented.

Spiral grooves 6A to 6C of the reverse lead blade are formed on the surface of the reverse lead blades 4A to 4C. A plurality of spiral grooves 6A to 6C of the reverse lead blade are formed in the tip direction (six in the present embodiment). The reverse lead blades 4A to 4C are formed in a spiral shape, and the blade is formed from a position of 0.5 to 3 mm at the tip of the blade bottom 3A of the positive lead blade 3. The spiral grooves 6A to 6C of the reverse reed blade are slightly narrow and shallow, and the cutting chips are collected in the large and deep groove of the spiral groove 5 of the positive reed and discharged to the upper part.

Further, the spiral direction of the reverse lead blades 4A to 4C is the direction in which the spiral is directed toward the cutting edge due to the rotation of the router end mill 1, and the reverse lead blade 4A is 0.5 to 3 mm at the tip of the blade bottom 3A of the positive lead blade 3. Since the blade is formed from the position, even if the groove depth of the material is shallow groove processing of 5 mm or less, the reverse lead blade 4A acts as a presser and suppresses the turning of the wood surface pasted with paper or sheet. You can do it.

The forward lead blade 3 and the reverse lead blades 4A to 4C are so-called spiral blades. Since the router end mill having a spiral blade like the router end mill 1 according to the present embodiment has a relatively small cutting resistance, the blade wear is small, the durability is excellent, and the finish is beautiful.

Since the router end mill 1 of the present invention is integrally molded with a cemented carbide as described in claim 4, it has high rigidity and a strong stress acts in the lateral direction intersecting the axial direction of the router end mill 1 in cutting work. However, chattering and blurring are less likely to occur, and machining accuracy (cutting accuracy) is good.

Further, by coating the forward lead blade 3 and the reverse lead blades 4A to 4C with diamond, it is possible to maintain the durability equal to or higher than that of the diamond tip.

Further, since the router end mill 1 is machined from a solid carbide round bar, it is possible to manufacture a router end mill 1 having a diameter of 10 mm or less, for example, a diameter of 3 mm, which was not possible with the chip brazing type.

The present invention is not limited to wood, and can be applied to all dry processing and semi-dry processing such as resin, aluminum, and other difficult-to-cut materials. Further, the coating is not limited to diamond coating, and other types of coating or non-coating can be applied depending on the type of processed material.

1 Router end mill 2 Shank part 3 Positive lead blade 3A Bottom blade 4A Reverse lead blade 4B Reverse lead blade 4C Reverse lead blade 5 Positive lead blade spiral groove 6A Reverse lead blade spiral groove 6B Reverse lead blade spiral groove 6C Reverse lead blade Spiral groove

Claims (4)

A router end mill having a forward lead blade and a reverse lead blade at the lower end of the shank portion, the width of the spiral groove of the positive lead blade is formed wider than the spiral groove of the reverse lead blade, and the positive lead blade is a bottom blade. A router end mill having a cutting edge portion from a tip to a nearby position, and the reverse lead blade having a cutting edge portion from a position near the bottom blade tip of the positive lead blade. The cutting edge portion of the positive lead blade is formed at a position of 1 to 4 mm from the tip of the bottom blade, and the cutting edge portion of the reverse lead blade is 0.5 to 3 mm from the tip of the bottom blade of the positive lead blade. The router end mill according to claim 1, wherein the router end mill is formed from a position. The router end mill according to claim 1 or 2, wherein the depth of the spiral groove of the positive lead blade is deeper than that of the spiral groove of the reverse lead blade. The router end mill according to any one of claims 1 to 3, wherein a cemented carbide is used as a material, and the forward lead blade and the reverse lead blade are coated with diamond. ..

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