JPH0729282B2 - Deep hole drilling machine for woodworking - Google Patents

Description

Detailed Description of the Invention

[0001]

[Industrial field of use] In recent years, in order to effectively use thinned wood, it has been practiced to cut four relatively thin logs and use them as square lumber. It is well known that such square timbers, general pillars such as timbers and logs, or pillars such as floor pillars may crack due to drying due to the difference in water content and shrinkage ratio between the central part and the peripheral part of the pillars. Has been.
In order to prevent such cracks and to dry the inside of the workpiece, a notch called "grinding" is performed on one side surface of the column in the longitudinal direction so as to reach almost the center. This type of core grinding absorbs the difference in shrinkage rate of the wood due to the spread of the notch and prevents cracks from occurring on the surface of the pillar, but depending on the use of the pillar material, the notch appears on the surface. In particular, there is a drawback in that when the cut portion expands, it deforms as a pillar material.

In order to prevent cracking of the pillar material without performing core grinding, it is an effective means to form a through hole in the center of the pillar material and absorb the shrinkage of the wood. However, such a pillar material has a long dimension, and it is necessary to form a very deep hole.
The present invention is a punching machine for making a deep hole in a long-sized workpiece as in the above case, and for deep-holes or through-holes extending from both ends to the middle of workpieces of different lengths. The present invention relates to a deep hole drilling machine for woodworking, which can efficiently drill holes. It should be noted that the long-sized workpiece for drilling a deep hole can be used for various purposes other than the purpose of reinforcing or connecting through a metal core in the longitudinal direction, for example.

[0003]

2. Description of the Related Art In a conventional general woodworking boring machine and woodworking drilling machine, it is usual to rotate a workpiece by supporting a drill in a cantilever manner by a headstock. With conventional rotating drills, it was not possible to form deep holes due to runout. The Applicant of the present invention has a drilling machine for drilling a deep hole by advancing and retracting a rotating long-sized drill from one end of a pillar material (Japanese Patent Laid-Open Nos. 1-247102 and 1-24940).
No. 2) is being developed. With this drilling machine, it is possible to process in one step for a work piece that is sufficient for the length of one drill, but to drill a through hole in a longer pillar material,
The set position of the work piece is reversed by 180 degrees so that the work piece can be processed from both ends as a separate process.

[0004]

DISCLOSURE OF THE INVENTION The conventional cantilever type punching machine does not assume deep hole machining such as machining a through hole in a long pillar material. Even if the conventional drilling machine is changed to be able to mount a long-sized drill, it is difficult to fit the center of the long-sized drill accurately, and the core runout is likely to occur due to bending due to its own weight. It is difficult to drill deep holes of exact size. In the deep hole drilling machine according to the applicant's earlier application, the above-mentioned drawbacks of the prior art can be solved. The present invention has improved this and is capable of efficiently processing a deep hole such as a through hole for a longer work piece from both ends, and is applicable to work pieces of different lengths. The invention is aimed at obtaining a punching machine capable of performing the above.

[0005]

A deep hole drilling machine for woodworking according to the present invention is directed toward a work piece in the left-right longitudinal direction of a work fixing portion 2 for fixing a long work piece A such as a pillar material. Arrange the drills 3 and 3'that move forward and backward. The long drills 3 and 3'provided in the left and right longitudinal directions respectively hold the rear ends of the headstocks 5 and 5'moving in the longitudinal direction, and hold the motors 6, 6 '.
6'rotates and the tip is supported by fixed bearing bases 7 and 7'which are fixed close to the end surface of the workpiece, and the left and right drills 3 and 3'are at the forward position of the tip of at least one of the drills. and the other of the forward position of the tip of the drill of the workpiece to a position which matches an intermediate position of the workpiece securing section 2
It shall be possible to move forward from both ends at the same time.
Stop one drill before the tip advance position matches
Stop after the other drill retracts from its forwardmost position.
Move the stopped drill forward . The fixed bearing pedestals 7 and 7 ′ are fixed to the work fixing portion 2 depending on the length of the workpiece.
It is advisable to advance it to and fix it at any position .

[0006]

Operation: With the workpiece fixed to the workpiece fixing section 2,
When the headstock 5 is moved forward while rotating one of the drills 3, the drill whose tip is supported by the fixed bearing base 7
The fixed bearing base 7 is slid and pushed forward, and its tip is perforated from one end face of the workpiece toward the center,
Drill to the intermediate position of the work piece. Similarly, the other drill 3 can be used to drill from the other end of the workpiece to an intermediate position of the workpiece, and holes from both ends are connected at the intermediate position of the workpiece to form a through hole. .
When forming a deep hole up to the middle instead of forming a through hole, the holes are drilled so as to have desired depths from both ends of the workpiece.

The left and right drills 3, 3'are driven one by one.
After finishing drilling with one drill,
It is possible to start drilling with
Drilling starts simultaneously from the end, and the tip of one drill 3
The other drill 3'before reaching the center of the fixed part
Wait until the tip of one drill 3 retracts and then stop.
By moving the drill 3'that had been moved forward, the workpiece
While drilling simultaneously from both ends of the drill 3,
In a short time without the tip and the tip of the drill 3'colliding.
Drilling work will be performed. If the distance between the starting position of drilling for the workpiece and the fixed bearing base 7 is large, the drill 3 between them is in a cantilever state and there is a high possibility of center runout, so the fixed bearing base 7 should be processed as much as possible. It is desirable to be fixed close to the end face of the object. Then, the workpieces are not always the same size. Therefore, when the size of the work piece changes, the fixed bearing base 7 is moved to a position as close as possible to the end surface of the work piece and fixed, so that drilling can be started without causing runout. When piercing is started, even if the drill is pushed out, the piercing position becomes one fulcrum, and core runout does not occur unlike the free end.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a deep hole drilling machine for woodworking according to the present invention will be described below with reference to the accompanying drawings. The main body frame 1 has a workpiece fixing portion 2 at an intermediate position in the longitudinal direction, and two symmetrical drills 3, which are opposed to each other on both sides of the workpiece fixing portion.
Place 3 '. The two drills 3, 3 ′ are supported at their base ends by headstocks 5, 5 ′ that move along guide rods 4, 4 ′ provided in two longitudinal directions on the left and right sides of the main body frame 1, and the motor 6 , 6 ', and the tip end is supported by fixed bearing bases 7, 7'. Drill 3 and 3 '
Is a spindle 6a, 6 driven by a motor 6 and 6 '
It is detachable to a '. As described above, the drill 3 and the structure for driving the drill 3 are the same as the drill 3'and the structure for driving the drill 3 '.

As shown in FIG. 1B, the headstock 5 is mounted on the work fixing part 2 so that the tip of the drill 3 can be advanced until it reaches a position slightly beyond the center of the work fixing part 2. It is assumed that the processed workpiece A has through holes processed by processing from both left and right ends. However, when the work piece has a length that can be processed with one drill, the work piece is set to the left or right of the work fixing part 2 and set, and either the left or right drill is set. Three
Or it can be processed by 3 '. The work fixing portion 2 is provided with four vices 9 and 9 in the illustrated embodiment in order to fix a workpiece at a plurality of positions.

As shown in FIG. 4, the guide rods 4 of the headstock 5 are installed parallel to each other on the body frame 1 as a pair in the longitudinal direction, which is the moving direction of the drill 3, and the headstock 5 is provided with the guide rods 4, 4. Shall be slidable on. In order to move the headstock 5, as understood from FIGS. 4 and 5, a feed screw 11 which is rotationally driven by a motor 10 is provided in the longitudinal direction in the main body frame 1, and the feed screw 11 and the headstock are moved. The female screw 12 fixed to 5 is screwed together. The moving means of the headstock 5 can be variously changed, such as a combination of a rack and a pinion, driving by a cylinder, other than the feed screw of the illustrated embodiment.

In the illustrated embodiment, the fixed bearing base 7 and the headstock 5 are moved along the guide rod 4 like the headstock,
Two moving bearing bases 8 are provided to support the intermediate position of the drill. In the present invention, the moving bearing stand 8 is not always necessary, but when the drill has a long dimension, the moving bearing stand 8 is provided to prevent runout of the drill 3 between the headstock 5 and the fixed bearing stand 7. It is preferably provided. The moving bearing base 8 slides on the guide rods 4 and 4 similarly to the headstock 5. The movable bearing base 8 may be forcibly moved by an air cylinder or the like so that it is located between the headstock 5 and the fixed bearing base 7 at equal intervals as much as possible. 5 is freely movable, and at least the intermediate position of the drill 3 is supported between the headstock and the fixed bearing base,
This has the effect of preventing runout of the drill 3.

A fixed bearing stand 7 for supporting the tip of the drill 3.
Is moved toward the front, that is, the work fixing portion 2, and can be fixed at an arbitrary position. Further, it is assumed that the vices 9 arranged on the work fixing portion at substantially equal intervals can also be moved to an arbitrary position on the work fixing portion 2 and fixed at the moved position. Fixed bearing stand 7 and vise 9
In order to make the work fixing unit 2 movable and to fix the work fixing unit 2, screw holes 13, 13 are formed at a constant pitch in the main body frame 1 of the work fixing unit 2 as shown in FIG. 9 and the fixed bearing base 7 are fixed to the screw hole 13 with the set bolt 14.

In the illustrated embodiment, the fixed bearing base 7 is fixed to the main body frame 1. However, the guide rod 4 is extended so that the fixed bearing base 7 can move on the guide rod 4 and fixed at any moved position. You may allow it. Further, the guide rod 4 may be provided over the entire length of the main body frame 1 so that the workpiece fixing means, that is, the vise 9 can also be moved along the guide rod and fixed at any moved position.

As shown in FIG. 1 (a), in the state where the drills 3 and 3'are arranged in the most retracted positions to the left and right with the work fixing portion 2 interposed therebetween, as shown in FIG. From the both ends of the work A by fixing the work A of length L with the vices 9 and 9 with the end faces approaching the tips of the drills 3 and 3 ', respectively, and pushing the drills 3 and 3'forward. Through holes can be provided. On the other hand, as shown in FIG.
As shown in (b), the vices 9 and 9 in the work fixing part 2 are moved in the central direction, and the fixed bearing bases 7 and 7'are also moved in the central direction, and at the moving position, the workpiece having the length L'is machined. When the object A ′ is fixed, the through hole can be formed in the object A ′.

In the fixed position shown in FIG. 1 (a), the headstocks 5 and 5'supporting the two drills 3 and 3'are located at the left and right ends of the main body frame 1, which is shown in FIG. As shown in, moves toward the center of the work fixing part. On the other hand, in the state shown in Fig. 2 (a), the headstocks 5 and 5'are moved forward, and with this position as a reference, the drills 3 and 3'are supported as shown in Fig. 2 (b). The headstocks 5 and 5'have the work fixing part 2
Move toward the center of. The forward position of the drills 3, 3'is such that the tip of the mounted drill reaches the center position of the work fixing part, and even if the length of the workpiece is changed and the fixed bearing base 7 is moved forward, the headstock 5 is moved. There is no need to change the forward position of the. That is, the movement of the headstock 5 is such that the retracted position is changed, and the forward movement position is the same in any case. Therefore, the guide rods 4, 4 and the feed screw
11 is provided in the maximum movement range of the headstock 5, and the retracted position is controlled by the limit switch.

As shown in FIG. 3, the headstock 5 is used in this embodiment.
3 limit switches 15, 16 and 17 are provided on the side of the main body frame, and hitting pieces 18 and 19 sensed by these limit switches are provided on the side surface of the main body frame at two positions, a retracted position and an advanced position of the headstock 5. There is. And hit piece 18,
19 is movable along rail-shaped mounts 20 and 21, so that the moving range of the headstock 5 can be changed. It is easy to understand that the forward and backward positions of the headstock 5 are set by the combination of any one of the limit switches 15, 16 and 17 and the contact pieces 18 and 19, but this combination of the limit switch and the contact piece Can be used not only to set the moving range of the headstock but also to control the drilling work more efficiently.

As shown in FIG. 1 (a) and FIG. 3, when the headstocks 5 and 5'which are retracted to the left and right ends are simultaneously moved forward, the work fixing part 2 is moved by the left and right drills 3 and 3 '. The workpiece A is punched from both ends at the same time. As the drilling work progresses, at the final stage of drilling, the headstock 5,
The limit switch 15, 15 'mounted on the 5'is the contact piece 18,
Detect 18 '. At this time, either one of the headstocks 5 or 5'which has detected the hitting piece first continues to move forward, and the other headstock 5'or 5'which has sensed the hitting piece stops the advancement of the other one. To wait. The headstock 5 or 5'which continues to move forward is the second limit switch.
When the 16 or 16 'senses the hit piece 18 or 18', it begins to retreat. Ie limit switch 16 or 16 '
Shall detect the position where the drill tip has passed the center of the workpiece fixing part.

When either one of the headstocks 5 or 5'begins to retreat, the stopped headstocks 5'or 5
The second limit switch 16 'or 16 is moved forward until the hitting piece 18' or 18 is detected, and then the headstock 5 is retracted to complete the machining of the through hole. The third limit switches 17 and 17 'detect the retracted position. In other words, the headstock 5 or 5'goes backward and stops when the limit switch 17 or 17 'detects the hitting piece 19 or 19'.

A general metal bearing may be used for the fixed bearing stand or the moving bearing stand for supporting the drill 3, but in such a fixed bearing, the bearing is used when the cutting blade of the drill comes into contact with the bearing. There is a possibility of abrading itself. In order to avoid this, the present inventor utilizes rotary bearings such as ball bearings and roller bearings. In this way, when the drill comes into contact with the contact resistance and the contact resistance is generated, the drill starts rotating together with the drill, and damage to the bearing itself can be avoided as much as possible.

The applicant of the present invention has previously invented JP-A-1-2.
In No. 49402, in order to prevent the tipping moment from acting on the headstock due to the cutting resistance acting on the drill, it is proposed to position the guide rod on which the headstock is supported and the drill on the same plane. There is. Although this idea may be utilized in carrying out the present invention, in the illustrated embodiment, the drill 3 is located at a position higher than the guide rod 4. In order to position the guide rod and the drill on the same plane, there is some difficulty in the arrangement of the equipment due to the design, but in the present embodiment, the drill drive mechanism is placed on the headstock that slides on the guide rod. It can be easily assembled and repaired such that it can be installed.
Incidentally, the reaction force against the drill during the drilling work is prevented from running out to some extent due to the presence of the fixed bearing base, and is practically used.

[0021]

According to the deep hole drilling machine for woodworking of the present invention as set forth in claim 1 , without moving the workpiece once set ,
Use two drills to drill from both ends simultaneously, and
At the center of the hole, the tips of the drill moving from both ends collide.
And there is no uncut portion.
You can Therefore, it is possible to reduce the
Through-holes can be efficiently drilled between them.

According to the invention of claim 2 , different lengths are provided.
When drilling the column material of
When working, place as close as possible to the drilling start position
Because the fixed bearing base can be moved, the core of the drill
Efficient machining of accurate holes without wobbling
You can

[0023]

[Brief description of drawings]

FIG. 1 is a front view of the entire deep hole drilling machine for woodworking, which is an embodiment of the present invention,

FIG. 2 is an overall front view of a deep hole drilling machine for woodworking, which is an embodiment of the present invention, showing a state of processing a rather short workpiece

FIG. 3 is a front view of only the right half part of the deep hole drilling machine for woodworking;

FIG. 4 is a plan view of only the right half of the deep hole drilling machine for woodworking;

5 is a sectional view taken along line XX of FIG.

[Explanation of symbols]

1-main body frame, 2-work holding part, 3,3'-drill, 4,4'-guide rod, 5,5'-headstock, 6,
6'-motor, 7,7'-fixed bearing stand, 8-moving bearing stand, 9-vice, 10-motor, 11-lead screw,
13-screw hole, 14-set bolt, 15 to 17-limit switch, 18, 19-piece.

Claims (2)

[Claims] 1. Drills 3 and 3'for advancing and retracting toward a work are arranged in the left and right longitudinal directions of a work fixing portion 2 for fixing a long-sized work, and the lengths provided in the left and right longitudinal directions are set. The drills 3 and 3 ′ of the dimensions are rotationally driven by motors whose rear ends are fixed to headstocks 5 and 5 ′ which move in the longitudinal direction, and the front ends are fixed close to the end face of the workpiece. The left and right drills 3 and 3 are supported by the bearing bases 7 and 7 ', and at least the forward position of the tip of one drill 3 and the advanced position of the tip of the other drill 3'are intermediate positions of the work fixing portion 2. Both ends of the workpiece up to the position where
From the two drills 3,3 '
Stop the advance of one drill before the end advance positions match
Stop after the other drill retracts from its forwardmost position.
A deep hole drilling machine for woodworking, characterized in that the stopped drill was moved forward . 2. The fixed bearing stand 7, 7'is attached to the work fixing portion 2.
It is possible to move forwards and backwards and fixed at any position.
The deep hole drilling machine for woodworking according to claim 1, wherein