JPH031219Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is used in wood cutting machines such as wood chamfering machines, wood grooving machines, wood router machines, etc. to cut one side of the wood-based material to be cut. 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 which has 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. however,
Even in such a rotary blade, the cutting resistance is not reduced and the durability is not improved. In order to deal with these problems, the present applicant has proposed that 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, and each adjacent Utility Model Application No. 61-31671 discloses a rotary blade in which each blade part of the cutting edge is formed to have the same width as each groove part or wider than this, and each blade part and each groove part are positioned opposite to each other. I have applied.

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.

[Problem that the invention attempts to solve]

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.

However, in such rotary blades, the precision of each part of the main body and the cutting edge is low, or the assembly part of the device that assembles the rotary blade, the bearing that supports the rotary blade, etc. is low precision and there is play. In this case, the depth of cut of the material to be cut by the rotary blade fluctuates, increasing height differences in the cutting portion, and streaks in the feeding direction of the material to be cut may occur due to the grooves of the rotary blade. The present invention seeks to address such problems.

[Means for solving problems]

The present invention provides each of the cutting edges of the rotary blade of the above-mentioned type: a first cutting edge that is provided with a cutting portion over the entire width direction, and a second cutting edge that is provided with a large number of approximately rectangular cutting portions and grooves having a predetermined width alternately in the width direction. A third blade which alternately comprises a cutting edge and a large number of substantially rectangular blade parts and grooves similar to the second cutting edge, and these blade parts and grooves are located opposite to the grooves and blade parts of the second cutting edge. A cutting edge is adopted, the first cutting edge is arranged between the second cutting edge and the third cutting edge, and each cutting edge of the second and third cutting edges has a width equal to or equal to the width of each opposing groove. It is characterized by being formed wider than this.

[Functions and effects of the idea]

According to this configuration, compared to a conventional rotary blade that employs a first cutting edge that is provided with a cutting edge over the entire width direction as each cutting edge, the second cutting edge that is provided with a large number of cutting edges and grooves alternately. Due to the third cutting edge, the material to be cut can be easily cut and the machinability is good, and the occurrence of cracks due to reverse stitching is prevented, and the following effects are achieved due to the first cutting edge. In other words, since the first cutting edge is arranged between the second cutting edge and the third cutting edge, the ridge-shaped non-cutting part left by the second cutting edge or the third cutting edge is the third cutting edge. Cutting is performed by the first cutting edge before cutting by the cutting edge or the second cutting edge. Therefore, the difference in height at the cutting part is corrected by the action of the first cutting edge, and no streaks appear due to the difference in height.

〔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 rotary shaft 22 and the rotary blade 10A are attached to an arm 23 on a support 23 that is protruded from the base and protrudes above the surface plate 21.
The main shaft holder 25 supported through the main shaft holder 25 rotatably presses and supports the main shaft, 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 paper in FIG. Processing is done.

As shown in FIGS. 1 to 4, the rotary blade 10A has a main body 11 and four cutting edges 12, 1 of three types.
3 and 14, the main body 11 is the rotating shaft 2.
2, and four arm portions 11b to 11e that are positioned at the same interval on the outer periphery of the cylindrical portion 11a and protrude outward like hooks. Each of the arm portions 11b to 11e is formed to have a predetermined width (in the vertical direction), and the pair of arm portions 11 are offset by 180° from each other.
The first cutting edge 12 is fixed to the inner surface of the arm portions 11c and 11d by brazing or the like, and the other arm portions 11c and 11e
A second cutting edge 13 and a third cutting edge 14 are fixed to the inner surface of the blade by brazing or the like.

In these cutting edges, the first cutting edge 12 is of a known type having a blade portion 12a over the entire width direction, and extends perpendicularly to the conveying direction of the material to be cut.
Further, the second cutting edge 13 and the third cutting edge 14 are provided with a large number of grooves 13a and 14a on their inner surfaces. Each of the grooves 13a is formed in a substantially rectangular shape with a predetermined width and depth, and is arranged at the same intervals in the width direction of the cutting edge 13, so that a large number of blades 13b are formed between the grooves 13a. Each blade portion 13b is formed slightly wider than each groove portion 13a. In addition, each groove portion 14a of the third cutting edge 14 and each blade portion 1
4b is also formed similarly to each groove portion 13a and each blade portion 13b of the second cutting edge 13. Each cutting edge 13,1
4, each groove portion 13a and each blade portion 14b, and each blade portion 13b and each groove portion 14a are located opposite to 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, the second
The third cutting edge 13, 14 has many blade parts 13b, 14b.
Since the grooves 13a and 14a are provided alternately,
Each groove part 13 is in the cutting part by each cutting edge 13, 14.
A large number of ridge-shaped non-cut portions corresponding to a and 14a are formed. However, the second cutting edge 1
The first cutting edge 12 is located between the third cutting edge 14 and the third cutting edge 14, and between the third cutting edge 14 and the second cutting edge 13. The cutting portion is cut prior to being cut by the third cutting edge 14 or the second cutting edge 13.

Therefore, the second and third cutting edges 13 of the rotary blade 10A,
The total length of each blade part 13b, 14b in 14 is 30% compared to each cutting edge of a conventional rotary blade of this type.
~50% less cutting force, which reduces cutting resistance and makes cutting easier, and improves the finish of the machined surface by reducing cracks caused by the grain against the wood grain. Also,
Local compressive deformation in the width direction of the workpiece 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.
The cutting edges 12 and 13 of 0A and 14 cut the material E at intervals P in the conveyance direction. Therefore, on the machined surface of the workpiece E, minute protrusions e1,
e2... remains, but these microprotrusions e
1, e2... are negligible in general cutting processing, as shown below, and the surface roughness of the machined surface is apparently no inferior 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 under such conditions, if the rotary blade devised by the applicant in the earlier application, in which the second cutting edge 13 and the third cutting edge 14 are arranged alternately, is used as the rotating blade, minute protrusions The height e of e1, e2, etc. is 0.001 mm, which corresponds to 2 cutting edges, and this size is a value that can be ignored in general cutting processing. However, if the accuracy of the main body of the rotary blade, the cutting edge, etc. is low, the assembly part of the device that assembles the rotary blade, the bearing that supports the rotary blade, etc. is low precision and there is play, The cutting depth of the material to be cut by the rotary blade varies, and at least one of the heights e of the minute protrusions e1, e2, . . . is enhanced. On the other hand, in the rotary blade 10A of this embodiment, each of the first cutting edges 12 is arranged alternately between the second and third cutting edges 13 and 14, so the height e of the microprotrusions is equal to the number of cutting edges. 4 or a much smaller value close to this. Therefore,
Even if the height e of the microprotrusions is increased due to the above-described accuracy problem, the microprotrusions can be ignored and no apparent streaks are caused by them.

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. Therefore, in the second and third cutting edges 15 and 16 of the rotary blade 10B of the second embodiment shown in FIGS. 6 and 7, grooves 15a and 16a are formed on the outer surfaces of the cutting edges 15 and 16, respectively. There is. In addition, each cutting edge 15, 16
Also, each groove portion 15a and each blade portion 16b, and each blade portion 15b and each groove portion 16a are located opposite to each other. In addition, the second and third cutting edges 17 and 18 of the rotary blade 10C of the third embodiment shown in FIGS. 8 and 9 are formed in an arc shape that gradually becomes concave toward the center in the width direction. has been done. In addition, in these cutting edges 17 and 18, each groove 17a and each blade 1
8b, each blade portion 17b and each groove portion 18a are located facing each other. Therefore, the rotary blades 10B and 10C of each of these embodiments have the same effects 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. In addition, in the first embodiment and the second embodiment, the first, second, and third
Although an example has been shown in which the tips of the cutting edges 12 to 18 extend perpendicularly to the feeding direction of the material to be cut, in the present invention, these tips may also have a shape having a lead angle extending at an angle with respect to the feeding direction. good.

[Brief explanation of the drawing]

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 the same as that shown in Fig. 2. A vertical cross-sectional view in the direction of the arrow, Figures 4a, b, and c are front views of each cutting edge, Figure 5 is a model diagram explaining the cutting state by the rotary blade, and Figures 6 and 7 are the second implementation. A plan view and a sectional view corresponding to FIGS. 2 and 3 of the rotary blade according to the example, and FIGS.
A plan view and a sectional view corresponding to FIGS. 2 and 3, and FIGS. 10 and 11 of the rotary blade according to the example.
The figures are a plan view and a sectional view corresponding to FIGS. 2 and 3 of a conventional rotary blade. Explanation of symbols, 10A, 10B, 10C...Rotary blade, 11...Main body, 11b to 11e...Arm part, 1
2...First cutting edge, 13,15,17...Second cutting edge, 14,16,18...Third cutting edge, 13a-1
8a...Groove portion, 13b-18b...Blade portion, 21...
...Surface plate, 22... Rotating shaft.

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. A rotary blade for woodworking that is equipped with a plurality of blades and that cuts one side of a workpiece, each of the blades having a first blade having a blade portion over the entire width direction, and a substantially rectangular blade portion having a predetermined width in the width direction. a second cutting edge that alternately includes a large number of grooves; and a large number of substantially rectangular blades and grooves that alternate with the second cutting edge, and these blade parts and grooves form the grooves of the second cutting edge. Adopts a third cutting edge located opposite the blade part,
The first cutting edge is arranged between the second cutting edge and the third cutting edge, and each cutting edge of the second and third cutting edges is formed to have the same width as or wider than each opposing groove. A rotary blade for woodworking that is characterized by: