JPH07214510A - Combination structure of lumber, working tool of lumber and working method for lumber - Google Patents

Abstract

PURPOSE:To provide a working tool of lumber by which a tenon and a mortise are worked through a kind of working tool. CONSTITUTION:A first cutter 30 having outside diameter R1 is fixed to a shank 29. A second cutter set up in outside diameter R2 larger than the outside diameter R1 is fixed in the rear part of the first cutter 30. Thereby, a first width B and a second width D are set up in the direction of an axial center A. An angle of inclination of theta is set up in the peripheral cutting edges 38, 39.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timber joint structure for use in, for example, a building, a wood working tool, and a wood working method.

[0002]

2. Description of the Related Art FIGS. 9A and 9B show a conventional timber connection structure. The first wood 100 is provided with tenon 103 facing the first surface 101 and the second surface 102.

The mortise 103 has a large groove 104 and a small groove 105. The large groove 104 has a depth a and a depth b, and has a depth c larger than the small groove 105 group depth a and a depth d smaller than the depth b.

The inner peripheral surface 106 of the large groove 105 is the second surface 102.
And the inner peripheral surface 107 of the small groove 105 has an inclination angle e with respect to the second surface. Inner peripheral surface 106 and inner peripheral surface 107
Semicircular curved portions 106A and 107A are provided on the bottoms of and.

The contact surface 111 of the second wood 108 contacting the second surface 102 is set to have the same length h as the depth b, and the projection amount i from the contact surface 111 is defined as the depth a. Large protrusions 113 that are set to be the same are provided.

At the center of the large protrusion 113, there is a small protrusion 112 having a length f equal to the depth d and a protrusion amount g from the end face 110 of the large protrusion 113 set to be equal to the depth c. The small protrusion 112 and the large protrusion 113 form a tenon 114.

The outer peripheral surface 116 of the large protrusion 113 is the contact surface 11.
1, the outer peripheral surface 115 of the small projection 112 has an inclination angle e with respect to the contact surface 111. A semi-circular curved portion 115A is formed on the lower portion of the outer peripheral surface 116 and the lower portion of the outer peripheral surface 115.
116A is formed.

Then, as shown in FIG. 10, the tenon 114 is fitted into the tenon 103 so that the first wood 108 and the second wood 108 are inserted.
And are combined. In this state, the first wood 100 and the second wood 108 are engaged with each other by the inclination angle e to prevent the first wood 100 from coming off in the direction of the arrow Q, the large projection 113 is received by the large groove 104, and the first wood 100 is the second wood 108. Support the load of.

FIG. 11A shows a processing tool 1 for forming a mortise 103.
17 is shown. The processing tool 117 has the first blade 120 fixed to the tip side of the shank 119 and the second blade 121 fixed to the rear of the first blade 120.

The outer peripheral blade 122 of the first cutter 120 is set with an inclination angle k with respect to the axis j, and the outer peripheral blade 1 of the second cutter 121 is set.
23 is parallel to the axis j.

To process the tenon 103, the shank 124 is held by a chuck (not shown) and the shaft center j and the first surface 10 are held.
1 is made parallel to the first wood 10 while rotating the processing tool 117 and vertically moving up and down along the processing standard of the first wood 100.
Cut 0.

FIG. 11B shows a processing tool 11 for the tenon 114.
8 is shown. The third cutting tool 125 is fixed to the tip side of the processing tool 118 shank 124, and the fourth cutting tool 126 is fixed behind it.

The outer peripheral edge 127 of the third blade 125 is parallel to the axis m, and the outer peripheral edge 128 of the fourth blade 126 has an inclination angle k with respect to the axis m.

To process the tenon 114, the shank 119 is held by a chuck (not shown) and the second wood 1 is used.
08 end surface 130 and the axis m are made orthogonal to each other
While rotating 8, the second wood 108 is cut by moving in a U-shape in the direction orthogonal to the axis m along the machining reference.

[0015]

In the conventional wood joining structure, the engagement force is generated only by the single small projection 112, so that a large load is applied in the direction Q that separates the first wood 100 and the second wood 108 from each other. If added, the small protrusion 112 and the small groove 105 may be damaged and the coupling function may be impaired.

Further, conventionally, separate machining tools 117 and 118 have to be prepared for machining the mortise holes 103 and the mortises 114, which increases the economical burden on the operator.

Further, there has been a problem that the number of working man-hours is increased due to the machining of the mortise holes 103 and the machining of the mortise holes 114, such as exchanging and moving the machining tools 117 and 118, and the machining efficiency is lowered.

A first object of the present invention is to provide a timber bonding structure capable of enhancing the bonding function between the first timber and the second timber.

A second object of the present invention is to provide a wood processing tool which can reduce the economic burden on the processor.

A third object of the present invention is to provide a method for processing wood which has improved mortise and tenon processing efficiency.

[0021]

In order to achieve the first object, the invention according to claim 1 has an opening on a first surface and a second surface arranged at a right angle to the first wood, and A large groove set to a depth along the surface and a depth along the second surface,
Provided in the center of the large groove, and the depth from the deep end face of the large groove is set to be the same as the depth of the large groove, and a mortise with a small groove set to a depth equal to or greater than the depth of the large groove, The first inner peripheral surface of the large groove and the second inner peripheral surface of the small groove are expanded in the depth direction to set the same inclination angle with respect to the second surface, and contact the second surface. A large protrusion having the same length as the depth of the large groove on the contact surface of the second wood contacting it, and the protrusion amount from the contact surface is set to be the same as the depth of the large groove, and the large protrusion. And a tenon having a small protrusion that is provided at the center of the small protrusion and is set to have the same length as the depth of the small groove, and the protrusion amount from the end face of the large protrusion is set to be the same as the protrusion amount of the large protrusion. A first outer peripheral surface of the large protrusion and a second outer peripheral surface of the small protrusion are spread in the protruding direction from the contact surface. The inclination angle and set the tilt angle in the same direction and the same amount was the tenon fitted in the mortise and coupling the second timber and the first timber.

In order to achieve the second object, the invention of claim 2 fixes a first blade having a predetermined outer diameter to the tip side of a rotatable shank, and the first blade in the axial direction of the shank. In the rear, by fixing a second cutting tool having an outer diameter larger than the outer diameter of the first cutting tool, the axial direction from the side cutting edge in front of the first cutting tool to the front cutting edge of the second cutting tool. The first width of the second cutter, the width in the axial direction of the second cutter is set to a second width of the first width or more, and the first outer peripheral blade and the second cutter of the first cutter. The two outer peripheral blades were set with the same inclination angle in the direction of expanding toward the tip side of the shank.

In order to achieve the third object, the invention of claim 3 fixes a first blade having a predetermined outer diameter to the tip side of a rotatable shank, and the first blade in the axial direction of the shank. In the rear, by fixing a second cutting tool having an outer diameter larger than the outer diameter of the first cutting tool, the axial direction from the side cutting edge in front of the first cutting tool to the front cutting edge of the second cutting tool. The first width of the second cutter, the width in the axial direction of the second cutter is set to a second width of the first width or more, and the first outer peripheral blade and the second cutter of the first cutter. The two outer peripheral blades have a machining tool with the same inclination angle in the direction of expanding toward the tip side of the shank, and this machining tool is movable in the axial direction and the direction orthogonal to the axial center. In the vicinity of the processing tool, the first wood having a right-angled first surface and a second surface is fixed, The center and the first surface are parallel to each other, and the axis and the second surface are orthogonal to each other, and the first in the axial direction from the side blade in front of the second cutting tool to the second surface. The cutting width is set to be the same as the first width, the machining tool is moved in the direction orthogonal to the axis along the machining standard of the first wood while rotating the shank, and the first and second knives With the first step of cutting the first wood with to form a mortise,
In the vicinity of the processing tool, the second wood that contacts the second surface is fixed, the end surface of the second wood is orthogonal to the axis, and the end surface from the side blade in front of the second cutting tool. After making the second cutting width in the axial direction up to the same as the first width,
A second tool that moves the working tool in a U-shape in a direction orthogonal to the axis along the working reference of the second wood and cuts the second wood with the first and second blades to form a tenon. Process,
Have.

[0024]

According to the first aspect of the present invention, both the first protrusion and the second protrusion engage with the second wood and the engaging force is doubled.

According to the second aspect of the present invention, if the movement of the shank in the axial direction and the movement trajectory of the first wood and the second wood in the direction orthogonal to the axial center are controlled, a single machining is performed. Both mortises and tenons can be machined with tools.

According to the third aspect of the invention, if the movement of the shank in the axial direction and the movement locus of the first wood and the second wood in the direction orthogonal to the axial center are controlled, a single machining is performed. Both mortises and tenons can be machined with tools.

[0027]

1 is a front view of a woodworking machine according to an embodiment of the present invention, for example, a multi-axis type finishing board A, and FIG. 2 is a plan view of FIG.

Guide rails 2 are vertically provided on the front surfaces of a pair of columns 1 provided at the rear portion of the base B of the finishing board A, and an elevating table 3 is attached to the guide rails 2.
The upper part of the pair of columns 1 is connected by a beam 4, and the beam 4 is provided with a motor 5.

A feed screw shaft 6 is erected upright in front of the support column 1. The feed screw shaft 6 is screwed into the female screw portion 7 of the lifting table 3, and the feed screw shaft 6 is normally and reversely rotated by a motor 5. It As a result, the lifting table 3 moves vertically.

A pair of guide rails 8 are horizontally provided on the front surface of the lifting table 3, and a tool holding table 9 is attached to the guide rails 8. The tool holding base 9 is provided with a pair of upper and lower openings 10 penetrating in the front-rear direction, and a frame 11 is provided between the openings 10.

An opening 12 penetrating in the front-rear direction is provided between the guide rails 8 of the lifting table 3, and the lifting table 3 holds the feed screw shaft 13 horizontally. The feed screw shaft 13 is screwed into the female screw portion 14 at the rear of the frame portion 11, and
It is rotated in the forward and reverse directions by the motor 15 fixed to. As a result, the tool holder 9 reciprocates in the horizontal direction.

A hollow case 16 as shown in FIG. 3 is fixed to the rear portion of the frame portion 11, two holes 17 are provided on the upper surface of the case 16, and two holes 17 are also provided on the lower surface. . Guide rails 18 are provided on both sides of the hole 17 along the front-rear direction, and four plate-shaped sliders 19 are attached to the guide rail in correspondence with the four holes 17.

Four motors 20 are fixed to the rear portion of the case 16, and four feed screw shafts 21 which are separately rotated forward and backward by the respective motors 20 are provided inside the case 16 along the front-rear direction. is there.

Female screws 22 are provided on the four sliders 19, and four feed screw shafts 21 are screwed into the female screws 22, respectively.

The motors 23 are mounted on the upper surfaces of the upper two sliders 19, respectively, and the motors 23 are mounted on the lower surfaces of the lower two sliders 19, respectively. A chuck 24 is provided at the front of each motor 23, and each chuck 24 has different types of machining tools 25, 26, 27,
28 is held separately. Therefore, when the feed screw shaft 21 is rotated in the forward and reverse directions by driving the motor 23, the machining tool 25
It is possible to adjust the amount of front projection of the front surface 9A of the tool holding table 9 of ~ 28.

FIG. 4 and FIG. 5 show the present embodiment, for example, the machining tool 2
It is a top view showing the case where it is applied to No. 5. The machining tool 25 is a first blade 30 having an outer diameter R1 on the tip side of the shank 29.
The outer diameter R1 on the rear side of the shank 29 in the axial center A direction.
A second blade 31 having an outer diameter R2 larger than the outer diameter R2 is fixed, and a third blade 32 having an outer diameter R3 larger than the outer diameter R2 is fixed behind the second blade 31.

The front side blade 34 of the second blade 31 is located in front of the rear side blade 36 of the first blade 30, and the third blade 3
The front side blade 35 of the second blade 31 is located in front of the rear side blade 37 of the second blade 31.

In this way, the first width B in the direction of the axis A is set from the side blades 33 to 34, and the second width D which is equal to or larger than the first width B is set from the side blades 34 to 35.

The first outer peripheral blade 38 of the first blade 30 and the second outer peripheral blade 39 of the second blade 31 are expanded toward the tip side of the shank 29 and have the same inclination angle θ with respect to the axis A. Has been set. The third outer peripheral blade 40 of the third blade 32 is parallel to the axis A.

A pair of wood holders E and F facing each other are provided in front of the support 1 on the base B, and a single wood holder G is provided in front of them.

The wood holders E, G and F are vices 4 respectively.
1, a handle 42 for adjusting the interval between the vices 41, a roller 43, and the like.

A laser marker 4A is provided on the front surface of the beam 4, and the first wood H and the second wood J are made to correspond to the beam (corresponding to the working standard) of the first wood H and the second wood J (for example, blackening). To position.

A control panel 44 is provided on the side surface of the support column 1 and has operation buttons (not shown) for controlling the operation of the motors 5, 20 and 23 individually.

The control panel 44 has a built-in CPU and the like (not shown) in which various processing programs are stored.

Next, the operation of the finishing board A will be described.

(First Step) As shown in FIGS. 1, 2 and 3, the first wood H having a rectangular cross section has a first surface 45 and a second surface 46 which are at right angles to each other, and the first surface 45 is raised. Is placed on the wood holding parts E, F with the second surface 46 facing toward the tool holding table 9 side.

Then, the first wood H is cut by the laser marker 4A.
Is positioned and fixed with a vise 41. Then, the first surface 45 and the axis A are parallel to each other, and the axis A and the second surface 46 are orthogonal to each other.

Next, the control board 44 is operated to operate the motors 5, 15
Is driven to operate the lifting table 8 and the tool holding table 9, and also to drive the motor 20 corresponding to the machining tool 25 to move only the machining tool 25 forward to hold a reference, for example, the front surface 9A of the tool holding table 9. From the side blade 34 to the second surface 46 to set the first cutting length K in the axial center A direction (FIG. 4). At this time, the axis A and the processing standard H1 of the first wood H match.

Thereafter, while rotating the shank 29, the machining tool 25 is vertically lowered along the machining reference to move the first cutting tool 30.
After cutting the first wood H by cutting the first wood H by a predetermined amount with the second blade 31 and the second wood 31, the mortise hole M as shown in FIG. 4 is formed by raising the working tool 25 vertically.

The mortise M is provided with a large groove 47 having a depth P along the first surface 45 and a depth S along the second surface 46, and is provided at the center of the large groove 47. And a small groove 49 having a depth V equal to or larger than the depth of the large groove 47.

The inner peripheral surface 50 of the large groove 47 and the inner peripheral surface 51 of the small groove 49 are expanded along the depth P and U directions, and the second surface 46 is formed.
Are set to the same inclination angle θ. Further, the bottoms of the large groove 47 and the small groove 49 are curved in a semicircle centered at the same center point (not shown).

(Second step) As shown in FIG. 2, the second wood Z is held by the wood holding portion G with the end surface 52 facing the processing tool 25 side and the first side surface 53 facing upward, and the positioning is fixed. To do. Then, the end surface 52 and the axial center A are orthogonal to each other.

Next, the working tool 25 is moved forward in the direction of the axis A so that the second cutting width W (FIG. 6) in the direction of the axis A from the side blade 34 to the end face 52 is the same as the first width B. Set to and stop. The axis A is the distance K with respect to the processing standard Z1 of the second wood Z.
Has 1.

Then, while rotating the shank 29, the machining tool 25 is vertically lowered by a predetermined amount, and the machining reference K1
The machining tool 25 is folded back into a semicircular shape (U-shape) orthogonal to the axis A about an upper center point (not shown) and rises vertically again.

As a result, the first blade 30 and the second blade 31
Then, the second wood Z is cut as shown in FIG. 6, and the tenon X is formed on the contact surface 54 as shown in FIG.

The tenon X has the same length Y as the depth S of the large groove 48.
And the amount of protrusion q from the contact surface 54 is set to the large groove 47.
Large projection 55 set to be the same as the depth P of
A small protrusion 57 that is provided at the center of the small groove 49 and has a length r that is the same as the depth V of the small groove 49, and the protrusion amount t of the large protrusion 55 from the end face 56 is set to be the same as the protrusion amount q of the large protrusion 55. Have.

On the outer peripheral surface 58 of the large protrusion and the outer peripheral surface 59 of the small protrusion 57, the inner peripheral surface 5 is widened in the protruding direction from the contact surface 54.
0, the same direction as the inner peripheral surface 51, and the same amount of inclination angle θ are set.

The lower ends of the outer peripheral surface 58 and the outer peripheral surface 59 have a semicircular shape with the same radius as the inner peripheral surface 50 and the inner peripheral surface 51.

Either of the first step and the second step may be performed first. In the present embodiment, the third blade 32 is not used for actual machining, but if the amount of protrusion of the machining tool 25 in the direction of the axis A is set to a large value, cutting with the third blade 32 can be performed.

By fitting the tenon X into the tenon M, the first wood H and the second wood Z can be joined as shown in FIG. The inner peripheral surface 50 of the large groove 47 receives the large protrusion 55, and the first wood H supports the load of the second wood Z.

Further, since the inclination angle θ is set on the outer peripheral surface 59 of the small protrusion 57, the small protrusion 57 generates an engaging force with respect to the first lumber H and the outer peripheral surface 58 of the large protrusion 55.
Also, since the inclination angle θ is set, the large protrusion 55 also generates an engaging force with respect to the first wood H, and the engaging force is doubled.

Therefore, the connecting function between the first wood H and the second wood Z is improved, and the second wood Z can be prevented from coming off in the direction of the arrow s.

In this embodiment, since the tenon X and the mortise hole M have the same planar shape, the first cutting width B and the second cutting width W are the same, and the depth P and the depth U are the same. 25
By adjusting the amount of protrusion and controlling the locus of movement in the direction orthogonal to the axis A, both the machining of the mortise M and the tenon X can be performed with a single machining tool 25.

Therefore, it is possible to reduce the economical burden on the working person, and it is possible to improve the working efficiency by eliminating the movement and replacement work of the working tool.

Further, a handle may be provided at the rear end of the feed screw shaft 21 and the handle may be manually operated for forward and reverse rotation. Alternatively, a slider 19 may be a fluid operated cylinder.
May be separately reciprocated.

Further, the present embodiment can be applied to a single-axis type, that is, a finishing machine having a motor 20, a slider 19, a motor 23, a chuck 24, etc., respectively. Corresponding to the fixing mode of the second wood, the first surface,
In the case of a finishing machine in which the second surface and the end surface are oriented differently from those of this embodiment, the shaft center of the shank of the machining tool is, of course, fixed.

In the first step, the processing tool 25 is moved to the processing reference H1.
Although it is vertically descending and ascending along the axis, the axis A is preliminarily located at a side having a predetermined distance with respect to the machining reference H1, and after the machining tool 25 is vertically descended, the machining tool 25 is moved to the machining reference H1.
A predetermined distance in the direction perpendicular to the axis A,
After that, a vertically rising machining operation may be performed.

When this machining operation is performed, it goes without saying that the machining tool 25 distance K1 in the second step becomes larger than that in the above embodiment. In this way, the dimension of the mortise M is enlarged along the surface direction of the second surface 46, and the dimension of the tenon X is enlarged along the surface direction of the end surface 52.

[0069]

As described above, the invention according to claim 1 has openings on the first surface and the second surface arranged at right angles to the first wood,
And, a large groove set to a depth along the first surface and a depth along the second surface, and provided in the center of the large groove,
And, the depth from the back end face of this large groove is set to be the same as the depth of the large groove, and a mortise having a small groove set to a depth greater than the depth of the large groove is provided, and the first inner peripheral surface of the large groove is provided. And the second inner peripheral surface of the small groove is expanded in the depth direction to set the same inclination angle with respect to the second surface, the contact surface of the second wood contacting the second surface A large protrusion having the same length as the depth of the large groove, and a protrusion amount from the contact surface set to be the same as the depth of the large groove, and provided at the center of the large protrusion, and A tenon having a small protrusion having the same length as the depth of the small groove and a protrusion amount from the end surface of the large protrusion set to be the same as the protrusion amount of the large protrusion is provided, and the first outer circumference of the large protrusion is provided. The surface and the second outer peripheral surface of the small projection in a direction projecting from the contact surface and extending in the same direction as the inclination angle. Since the same amount of inclination angle is set and the tenon is fitted into the tenon hole to join the first wood and the second wood, both the first projection and the second projection are engaged with the second wood. As a result, the engaging force is doubled and the coupling function is improved.

According to a second aspect of the present invention, a first blade having a predetermined outer diameter is fixed to the tip side of the rotatable shank, and the first blade is provided behind the first blade in the axial direction of the shank. By fixing the second blade having an outer diameter larger than the outer diameter, the first width in the axial direction is set from the side blade in front of the first blade to the side blade in front of the second blade, The width of the second cutting tool in the axial direction is set to a second width equal to or larger than the first width, and the first outer peripheral blade of the first cutting tool and the second outer peripheral cutting tool of the second cutting tool, the shank. Since the same inclination angle was set in the direction of expanding toward the tip side of the shank, the movement of the shank in the axial direction and the locus of movement in the direction orthogonal to the axial center along the machining standard of the first wood and the second wood Can control both mortises and mortises with a single tool, reducing the economic burden on the processor Kill.

According to a third aspect of the present invention, a first blade having a predetermined outer diameter is fixed to the tip side of the rotatable shank, and the first blade is provided behind the first blade in the axial direction of the shank. By fixing the second blade having an outer diameter larger than the outer diameter, the first width in the axial direction is set from the side blade in front of the first blade to the side blade in front of the second blade, The width of the second cutting tool in the axial direction is set to a second width equal to or larger than the first width, and the first outer peripheral blade of the first cutting tool and the second outer peripheral cutting tool of the second cutting tool, the shank. Has a processing tool with the same inclination angle in the direction of expanding toward the tip side of the
The processing tool is configured to be movable in the axial direction and in a direction orthogonal to the axial center, and in the vicinity of the processing tool, a first wood having a right-angled first surface and a second surface is fixed, and the shaft The center and the first surface are parallel to each other, and the axis and the second surface are orthogonal to each other, and the first in the axial direction from the side blade in front of the second cutting tool to the second surface. The cutting width is set to be the same as the first width, the machining tool is moved in the direction orthogonal to the axis along the machining standard of the first wood while rotating the shank, and the first and second knives In the first step of forming a mortise by cutting the first wood in the vicinity of the processing tool,
The second wood contacting the second surface is fixed, the end surface of the second wood is orthogonal to the shaft center, and the second in the axial direction from the side blade in front of the second cutting tool to the end surface. (2) After making the cutting width the same as the first width, the working tool is moved in a U-shape in a direction orthogonal to the axis along the working standard of the second wood, and the first cutting tool and the second cutting tool are used. The second step of cutting the second wood to form a tenon, and therefore, the movement of the shank in the axial direction and the movement trajectory of the first wood and the second wood in the direction orthogonal to the axial center along the machining reference. By controlling, it is possible to machine both the mortise and tenon with a single machining tool, eliminating the need for moving or exchanging machining tools, and improving machining efficiency.

[Brief description of drawings]

FIG. 1 is a plan view of a finishing board which is an embodiment of the present invention.

FIG. 2 is a front view of a finishing board which is an embodiment of the present invention.

FIG. 3 is a side cross-sectional view of a lift table and a tool holding table of the finishing machine according to the embodiment of the present invention.

FIG. 4 is a plan cross-sectional view of processing the first wood with the processing tool according to the embodiment of the present invention.

FIG. 5 is a perspective view of a first piece of wood in which mortises have been processed by the processing tool according to the embodiment of the present invention.

FIG. 6 is a plan sectional view of processing a second piece of wood with the processing tool according to the embodiment of the present invention.

FIG. 7 is a perspective view of a second piece of wood whose tenon is processed by the processing tool according to the embodiment of the present invention.

FIG. 8 is a plan view showing a combined state of the first wood and the second wood according to the embodiment of the present invention.

FIG. 9A is a perspective view of a first wood piece having a conventional tenon, and FIG. 9B is a perspective view of a second wood piece having a conventional tenon.

FIG. 10 is a plan view of a conventional first wood and a second wood in a combined state.

11A is a plan sectional view of a conventional mortise processing step, and FIG. 11B is a plan sectional view of a conventional mortise processing step.

[Explanation of symbols]

 29 Shank R1 Outer Diameter of First Cutting Tool 33 Side Blade of First Cutting Tool 30 First Cutting Tool A Axial R2 Outer Diameter of Second Cutting Tool 31 Second Cutting Tool 34 Side Cutting of Second Cutting Tool B First Width D Second Width 38 , 39 Peripheral blade θ Angle of inclination

Claims (3)

[Claims] 1. A large groove which is open at a first surface and a second surface arranged at a right angle to the first wood and which is set to have a depth along the first surface and a depth along the second surface. A mortise provided at the center of the large groove, having a depth from the rear end face of the large groove set to be the same as the depth of the large groove, and having a small groove set to a depth equal to or larger than the depth of the large groove. The first inner peripheral surface of the large groove and the second inner peripheral surface of the small groove are expanded in the depth direction to set the same inclination angle with respect to the second surface, A large protrusion having the same length as the depth of the large groove on the abutting surface of the abutting second wood, and the protrusion amount from the abutting surface is set to be the same as the depth of the large groove; It is provided in the center of the protrusion and is set to the same length as the depth of the small groove, and the amount of protrusion from the end face of the large protrusion is set to A tenon having a small protrusion set to have the same amount as the original protrusion amount is provided, and the tenon is expanded on the first outer peripheral surface of the large protrusion and the second outer peripheral surface of the small protrusion in the protruding direction from the contact surface. And a tilt angle of the same amount as the tilt angle are set, and the tenon is fitted into the tenon hole to join the first wood and the second wood. . 2. A first blade having a predetermined outer diameter is fixed to a tip side of a rotatable shank, and an outer diameter larger than an outer diameter of the first blade is provided behind the first blade in the axial direction of the shank. By fixing the second blade of the diameter, to set the first width in the axial direction from the side blade in front of the first blade to the side blade in the front of the second blade, the second blade of the The width in the axial direction is set to a second width equal to or larger than the first width, and the first outer peripheral blade of the first blade and the second outer peripheral blade of the second blade, toward the tip side of the shank. A wood processing tool characterized by setting the same inclination angle in the direction of expansion. 3. A first blade having a predetermined outer diameter is fixed to the tip side of a rotatable shank, and an outer diameter larger than the outer diameter of the first blade is provided behind the first blade in the axial direction of the shank. By fixing the second blade of the diameter, to set the first width in the axial direction from the side blade in front of the first blade to the side blade in the front of the second blade, the second blade of the The width in the axial direction is set to a second width equal to or larger than the first width, and the first outer peripheral blade of the first blade and the second outer peripheral blade of the second blade, toward the tip side of the shank. It has a machining tool in which the same inclination angle of the expanding direction is set, and the machining tool is configured to be movable in the axial direction and in a direction orthogonal to the axial center. A first wood having one surface and a second surface is fixed, the axis and the first surface are made parallel, and the axis is Rotate the shank by setting the first cutting width in the axial direction from the side blade in front of the second cutting tool to the second surface to be the same as the first width, and orthogonal to the second surface. A first step of forming a mortise by cutting the first wood with the first and second blades by moving the processing tool in a direction orthogonal to the axis along the processing reference of the first wood And, in the vicinity of the processing tool, the second wood contacting the second surface is fixed, the end surface of the second wood and the axis are orthogonal to each other, and from the side blade in front of the second cutting tool. After making the second cutting width in the axial direction to the end face the same as the first width,
A second step of moving the processing tool in a U-shape in a direction orthogonal to the axis along a processing standard of the second wood and cutting the second wood with the first and second blades to form a tenon. A method for processing wood, comprising: