JPH031218Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is for cutting one side of a wood-shaped workpiece used in wood cutting machines such as wood chamfering machines, wood grooving machines, wood router machines, etc. Regarding rotary blades.

[Prior art]

As a type of rotary blade for woodworking, a cutting edge of a predetermined width is attached to the outer periphery of a rotating body that is attached to a driving member provided on a base so as to be able to transmit torque. There is a rotary blade for woodworking that is provided with a plurality of rotary blades at predetermined intervals in the direction of rotation of the main body and cuts one side of a workpiece. In this type of rotary blade, as shown in FIGS. 10 and 11, the tip of each cutting edge 1 to 4 is formed into blade portions 1a to 4a over the entire width direction, and the cutting material is (wood) is cut evenly across the entire width of each cutting edge 1 to 4.

However, in general, this type of rotary blade has the following characteristics: the cutting resistance against the material to be cut is small, the cutting force is light, and it can cut sharply, the cutting process has a good finish, and it has excellent durability.
It is desired that the price be low. Also,
There are various factors that influence these.

These factors include local compressive deformation of the cut material in its width direction due to the impact force of the rotary blade on the cut material during cutting, and the unique factor of the reverse grain of the cut material because the cut material is wood. However, as a means to deal with these factors, there is a means of forming each cutting edge 1 to 4 in a shape that is inclined with respect to the feeding direction of the material to be cut, and the above-mentioned angle of inclination in such a rotary blade is called the lead angle. ing. In such rotary blades, each cutting edge applies an impact force in an inclined line in the width direction of the material to be cut, which reduces local compressive deformation in the width direction of the material to be cut, improving cutting performance. The quality of the wood is improved, and the occurrence of cracks due to the reverse grain of the wood is reduced.

[Problem that the invention attempts to solve]

However, even in such a rotary blade, the cutting resistance is not reduced and the durability is not improved. The purpose of the present invention is to solve these problems.

[Means for solving problems]

The present invention has been made to achieve such an object, and in the present invention, each cutting edge of the above-mentioned type of rotary blade is provided with a large number of approximately rectangular blade portions and groove portions of a predetermined width alternately in the width direction thereof. , and each blade part of each adjacent cutting edge is formed to have the same width as or wider than each groove part, and each blade part and each groove part are located opposite to each other.

[Functions and effects of the idea]

In a rotary blade having such a configuration, the number of blade portions of each cutting edge is smaller than that of a conventional rotary blade, so cutting resistance is reduced and the material to be cut can be easily cut. In addition, in each cutting edge, each blade part and each groove part are located alternately in the width direction of the workpiece, so the impact force on the workpiece is small, and therefore the local part in the width direction of the workpiece is small. Since the compressive deformation is small, machinability is improved, and the occurrence of cracks caused by reverse grains is prevented.

Therefore, in a rotary blade having such a configuration, a large number of ridge-shaped non-cutting parts corresponding to each groove are formed in the cutting part by each cutting edge, but these non-cutting parts are sequentially cut by adjacent cutting edges. . In addition, since the rotational speed of the rotary blade is extremely fast relative to the feed rate of the material to be cut, the uncut portion remaining between each cutting edge is extremely small, and the surface roughness of the machined surface is comparable to that of conventional rotary blades. Kakegami is no different.

〔Example〕

The present invention will be explained below based on the drawings.
The figure shows a high-speed vertical shaft type chamfering machine (chamfering machine) equipped with a rotary blade 10A according to a first embodiment of the present invention. The chamfering machine is commonly used as a chamfering machine for woodworking, and the rotary blade 10A is driven by an electric motor placed on a base (not shown).
It is fitted and fixed to a rotating shaft 22 that protrudes above the rotating shaft 22, and is assembled so as to be able to rotate integrally with the rotating shaft 22. Further, the rotating shaft 22 and the rotating blade 10A are attached to an arm 2 on a support 23 that is protruded from the base and protrudes above the surface plate 21.
It is rotatably pressed and supported by a spindle holder 25 supported via a spindle holder 25, so that it can rotate at high speed in a stable state. In this chamfering machine, the wood to be cut is conveyed along a ruler protruding from the surface plate 21 in a direction penetrating both sides of the page of FIG. Processing is done.

As shown in FIGS. 1 to 4, the rotary blade 10A has a main body 11 and two types of four cutting edges 12, 1.
3, the main body 11 consists of a cylindrical portion 11a that is fitted and fixed to the rotating shaft 22, and 4 that is located at the same interval on the outer periphery of the cylindrical portion 11a and protrudes outward like a hook.
It has book arms 11b to 11e. Each arm 1
1b to 11e are a pair of arm portions 11b and 11 that are formed to have a predetermined width (in the vertical direction) and are offset by 180 degrees from each other.
A first cutting edge 12 is fixed to the inner surface of d by brazing or the like, and a second cutting edge 13 is fixed to the inner surfaces of the other pair of arms 11c, 11e by brazing or the like.

Each of the cutting edges 12 and 13 has a predetermined width (in the vertical direction) and extends perpendicularly to the conveyance direction of the material to be cut.
Each of the cutting edges 12, 13 has a predetermined thickness, and has a large number of grooves 12a, 13b on their inner surfaces. Each groove 12a is formed into a rectangular shape with a predetermined width and depth, and is arranged at the same interval in the width direction of the cutting edge 12, so that a large number of rectangular blade portions 12b are formed between each groove 12a. . Each blade part 1
2b is formed slightly wider than each groove 12a. Further, each groove portion 13a and each blade portion 13b of the cutting edge 13 are formed similarly to each groove portion 12a and each blade portion 12b of the cutting edge 12. Each cutting edge 12,
13, each groove portion 12a and each blade portion 13b
And each blade part 12b and each groove part 13a are located facing each other.

In the rotary blade 10A having such a configuration, the electric motor of the chamfering machine rotates integrally with the rotary shaft 22 at, for example, 5000 rpm, and the material to be cut (wood) is conveyed at a conveyance speed of, for example, 6 m/min. Cut and chamfer the sides. In this case, each cutting edge 12, 13 has a large number of blade parts 12b, 13b and a groove part 1.
2a and 13a alternately, each blade part 1
2 and 13 have grooves 12a and 13a, respectively.
A large number of ridge-shaped non-cutting portions corresponding to the grooves 1 on each cutting edge 12, 13 are formed
2a and each blade portion 13b, each blade portion 12b and each groove portion 13
Since the blades a are positioned opposite each other, each of the non-cutting portions is sequentially cut by the adjacent cutting edges. Therefore, the total blade length of each cutting edge 12b, 13b of each cutting edge 12, 13 of the rotary blade 10A is 30 to 50% smaller than that of each cutting edge of a conventional rotary blade of this type, thereby reducing cutting resistance. Cutting is done easily,
In addition, there are fewer cracks due to the opposite grain to the wood grain, improving the finish of the machined surface. In addition, local compressive deformation in the width direction of the material to be cut during cutting is small, improving machinability.

By the way, the cutting state of the material to be cut by the rotary blade 10A is as shown in FIG.
Each cutting edge 12, 13 of 0A cuts the workpiece E at intervals P in the conveyance direction. Therefore, minute protrusions e1, e2... remain on the machined surface of the workpiece E at intervals P, but these minute protrusions e1, e2... are ignored in general cutting as shown below. The surface roughness of the machined surface is apparently comparable to that of the conventional method.

(1) The cutting interval P is P=F/(nN) where the rotation speed of the rotary blade is N, the conveyance speed of the cut material is F, and the number of cutting edges is n. (2) Height of microprotrusions e1, e2... e is when the radius of rotation of the rotary blade is R (3) As the working conditions of the high-speed vertical shaft type chamfering machine, the rotation radius R of the rotary blade is 50 mm, the rotation speed N is 5000 rpm,
When the conveyance speed F of the cut material is 6 m/min Number of cutting edges of rotary blade 2...P=0.6mm, e=0.001mm Number of cutting edges of rotating blade 4...P=0.3mm, e=0.0002
mm When cutting is performed under the above conditions using the rotary blade 10A of this embodiment, minute protrusions e1, e2...
The height e is 0.001 mm, which corresponds to the number of cutting edges 2,
This size is a value that can be ignored in general cutting processing.

6 to 9 show rotary blades 10B and 10C according to second and third embodiments of the present invention.
In each of these rotary blades 10B and 10C, each main body is similar to the main body of the rotary blade 10A of the first embodiment,
Each cutting edge is different from that of the rotary blade 10A. Thus, in each of the cutting edges 14 and 15 of the rotary blade 10B of the second embodiment shown in FIGS. 6 and 7, grooves 14a and 15a are formed on the outer surfaces of the cutting edges 14 and 15, respectively. In each of the cutting edges 14 and 15, each groove portion 14a and each blade portion 15b, and each blade portion 14b and each groove portion 15a are located opposite to each other. Also,
Rotary blade 1 of the third embodiment shown in FIGS. 8 and 9
Each of the 0C cutting edges 16 and 17 is formed in an arcuate shape that is gradually concave toward the center in the width direction. In addition, each groove part 16a, each blade part 17b, each blade part 16 also in these cutting edges 16 and 17.
b and each groove portion 17a are located facing each other.
Therefore, the rotary blades 10B and 10C of each of these embodiments
This produces the same effect as the rotary blade 10A of the first embodiment.

In addition, in each of the above embodiments, an example of a rotary blade employed in a high-speed vertical shaft type chamfering machine was shown, but the present invention cuts one side or multiple sides of wood into an appropriate shape or grooves it. It can be applied to the rotary blades of various wood cutting machines. Furthermore, in the first and second embodiments, an example was shown in which the tips of the cutting edges 12 to 15 extend perpendicularly to the feed direction of the material to be cut, but in the present invention, these tips extend in the above feed direction. The shape may have a lead angle extending obliquely with respect to the direction.

[Brief explanation of drawings]

Fig. 1 is a partial side view showing a part of a chamfering machine equipped with a rotary blade according to the first embodiment of the present invention, Fig. 2 is an enlarged plan view of the rotary blade, and Fig. 3 is a view similar to that shown in Fig. 2. 4a and 4b are front views of each cutting edge, FIG. 5 is a model diagram explaining the cutting state by the rotary blade, and FIGS. 6 and 7 are for the second embodiment. A plan view and a sectional view corresponding to FIGS. 2 and 3 of the rotary blade, and FIGS. 8 and 9 are a plan view and a sectional view corresponding to FIGS. 2 and 3 of the rotary blade according to the third embodiment. 10 and 11 are a plan view and a sectional view corresponding to FIGS. 2 and 3 of the conventional rotary blade. Explanation of symbols, 10A, 10B, 10C...Rotary blade, 11...Main body, 11b to 11e...Arm portion, 1
2 to 17...Blade tip, 12a to 17a...Groove portion, 1
2b to 17b...Blade portion, 21...Surface plate, 22...
Axis of rotation.

Claims (1)

[Scope of utility model registration request] A cutting edge of a predetermined width extending crosswise to the rotation direction of the main body is maintained at a predetermined interval in the rotation direction of the main body on the outer periphery of a rotating main body that is assembled to a driving member provided on a base so as to be able to transmit torque. In a woodworking rotary blade that cuts one side of a workpiece, each cutting edge has a large number of substantially rectangular blades and grooves of a predetermined width alternately in the width direction, and each adjacent A rotary blade for woodworking, characterized in that each blade part of the cutting edge is formed to have the same width as or wider than each groove part, and each blade part and each groove part are located opposite to each other.