JPH07328995A - Punching tool for wood plate material - Google Patents

Abstract

PURPOSE:To provide a tool capable of punching a plate with good finish even when the hole is large in diameter and the plate is thick in thickness. CONSTITUTION:This punch tool is provided with a punch tool main body 4 having the first cutting edge section 21 at the tip and a preceding hole punch member 24 having the second cutting edge section 25 protruded to the tip side on the inside. The first cutting edge section 21 is formed on a cylindrical section 20c formed on the punch tool main body 4, and a plate material relief recess 22 is formed in the cylindrical section 20c. The preceding hole punch member 24 is axially movably fitted to the guide holes 23A, 23B of the punch tool main body 4, and it is protrusively excited by a spring 28. A slag drop piece 26 is provided in the plate material relief recess 22 of the preceding hole punch member 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punch tool for punching a wooden board material using a punch press machine.

[0002]

2. Description of the Related Art A conventional punch press machine is mainly used for punching a metal plate material, and a plate material on a table is fed between a punch and a die which are vertically opposed to each other. The punch driving mechanism is configured to raise and lower the punch to perform punching at a desired position of the plate material. On the other hand, veneer boards, water-resistant plywood, wood board materials such as particle boards have been conventionally used with woodworking equipment such as drills, drills and saws, but there is the problem of poor work efficiency. . Then, it was considered that such punching of the wooden board material could be easily performed using a punch press machine.

[0003]

However, when a punching tool having a shape similar to that used in the conventional metal working is used for working a wood plate material, a punch is generated at the exit side portion of the punched hole, or the punched hole is punched. There is a problem that the area around is crushed and the finish becomes poor. Such a problem becomes significant when the hole diameter is large or when the plate thickness is large. Woody plate materials often require large-diameter hole drilling, and plate materials that are considerably thicker than metal plates are often handled, which requires improvements in the punch tool shape. Furthermore, when making a hole in a thick wood plate, the plate may shake during the process or at the start of the process, which also deteriorates the finish of the punch holes. As a punching tool for wood plate material with the purpose of preventing the above-mentioned crispy, I tried to provide a recess for releasing the cut piece of the plate material at the tip surface, but when the recess for the release is deep, the cut piece of the plate material is inside the recess for escape. Therefore, it was difficult to deal with thick plates by deepening the relief recess.

An object of the present invention is to provide a punching tool for a wooden plate material which has a large hole diameter and can be punched well even when the plate thickness is large.
Another object of the present invention is to prevent the plate material cutting piece from being clogged in the plate material relief recess provided in the punch tool. Still another object of the present invention is to eliminate stable runout of a plate material during processing and enable stable hole processing.

[0005]

A punching tool for a wooden board material according to the present invention is for punching a wooden board material by using a punch press machine, and has a punch having a first cutting blade portion all around the tip. A tool body and a preceding hole punch member having a second cutting blade portion projecting from the punch tool body to the tip side of the cutting blade portion within a range surrounded by the cutting blade portion are provided. Is. The punch tool body and the preceding hole punch member do not necessarily have to be formed separately. In the above-mentioned structure, it is desirable to form a plate material escape recess on the tip surface of the punch tool body. An axial guide hole is provided on the bottom surface of the recess, and the base end side portion of the preceding hole punch member is mounted in the guide hole so as to be movable back and forth. Further, the preceding hole punch member is provided with a slag drop piece for pushing the cut piece of the plate material by the first cutting blade portion in a position within the plate material release recess. Further, a punch mounting base for gripping the punch tool main body and mounted on the punch press machine is provided, and a plate pressing plate for pressing a plate material around the punch tool main body is provided on the punch mounting base via an elastic body. desirable.

[0006]

According to the punch tool having this structure, when the punch tool is lowered toward the wooden plate material, first, the second cutting blade portion of the preceding hole punch member is used to form the preceding hole smaller than the target diameter in the plate material. It Subsequently, the first cutting blade portion of the punch tool body shears the punch hole having the target diameter around the preceding hole. Since the preceding hole is provided and the hole is formed around the preceding hole in this manner, the cut piece of the plate material can bend inward and escape into the preceding hole when the first cutting blade portion opens the hole of the target diameter. For this reason, even when processing a large-diameter hole or processing a thick plate material, an unreasonable load does not act on the plate material, and it is possible to perform a good finish. When the first cutting blade portion is provided with a plate material release recess, the cut piece of the plate material can escape into the recess, resulting in a better punch hole finish and preventing crimping at the outlet. To be done. Further, when the slag drop piece is provided so that the preceding hole punch member can be moved forward and backward, the cut piece of the plate material that has entered the plate material release recess due to the punching operation can be pushed out by the slag drop piece. Therefore, the cut pieces do not remain in the tool and do not affect the subsequent punching. When the plate pressing plate is provided as described above, the plate material can be pressed around the punched portion at the start of processing or during processing, and the punching is stabilized.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. This wood plate punch tool includes a punch tool body 4 having a first cutting blade portion 21 and a preceding hole punch member 24 having a second cutting blade portion 25.
The punch tool body 4 includes a thick-walled cylindrical punch holder 18
And the punch 20 having the shank portion 20a at the upper end fitted to the lower end of the inner diameter hole 27 of the punch holder 18. The punch 20 has a shoulder surface 20 from which the shank portion 20a projects.
It is engaged with the lower surface of the punch holder 18 by b and is fixed to the punch holder 18 by a set screw 19 screwed to the punch holder 18. The punch 20 has a cylindrical portion 20c on the tip side, and the entire circumference of the tip of the cylindrical portion 20c is formed on the first cutting blade portion 21. The cutting blade portion 21 has a cross-sectional shape with a tapered surface on the inner diameter side. The inside of the cylindrical portion 20c serves as a plate material escape recess 22 that is open at the tip surface of the punch 20. On the bottom surface of the recess 22 for releasing the plate material, an axial guide hole 2 is provided at the center.
3B penetrates. The inner diameter hole 27 of the punch holder 18 is a stepped hole, and the upper portion thereof is a guide hole 23A having the same diameter as the guide hole 23B.

The leading hole punch member 24 has a round shaft-shaped guide shaft portion 24a at the base end side, and the second cutting through a flange-shaped slag drop piece 26 and a small diameter shaft portion 24b on the lower side thereof. The blade portion 25 is formed. The second cutting blade 25 has a truncated pyramid shape with the lower end surface being a rhombic flat surface, and has a truncated pyramid shape that is narrowed to the upper side, and is surrounded by the first cutting blade 21 of the punch tool body 4. It is supposed to fit inside. The small-diameter shaft portion 24b is a prism having the same rhombic cross section as the upper end of the second cutting blade portion 25, and thus has a smaller diameter than the tip end surface of the second cutting blade portion 25. In the preceding hole punch member 24, the guide shaft portion 24a is vertically movably fitted over the upper and lower guide holes 23A and 23B of the punch tool main body 4, and the slag drop piece 26 is used for the punch 2.
It is fitted in the plate material escape recess 22 of No. 0. The punch holder 1 is attached to the guide shaft portion 24 a of the preceding hole punch member 24.
A ring-shaped stopper 29 fitted in the inner diameter hole 27 of No. 8 is fixed by a set screw 30, and is pushed downward through the stopper 29 by a pushing spring 28 housed in the inner diameter hole 27. ing. Leading hole punch member 24
The lower end of the slag is regulated by the stopper 29 engaging with the upper end of the punch 20, and in this state, the slag drop piece 26 is located near the lower end of the plate material recess 22.
Further, the rising end of the preceding hole punch member 24 is restricted by the slag dropping piece 26 engaging with the bottom surface of the plate material releasing recess 22 as shown by the chain line, and in this state, the second cutting blade portion 25 is It is located at a position projecting to the tip side with respect to the first cutting blade portion 21.

FIG. 2 is a cutaway front view showing a peripheral portion of the punch tool 1 of the punch press machine. The punch tool 1 and the die tool 2 are installed on an upper die installation base 31 and a lower die installation base 32 of the punch press machine so as to face each other vertically. When the punch press is a turret punch press, the upper turret and the lower turret serve as the upper die installation base 31 and the lower die installation base 32, respectively. The punch holder 18 constituting the punch tool body 4 of the punch tool 1 is
Punch mount 3 installed on the upper die installation base 31 so that it can be moved up and down
Is fixed to the lower surface of the punch and is driven up and down together with the punch mount 3 by a punch driving mechanism (not shown) of the punch press.
The punch mount 3 is provided with a punch tool body 4 during drilling.
A plate pressing plate 7 that presses the plate material W around is provided. The plate pressing plate 7 is supported by the punch mounting base 3 via a plurality of lifting guides 8 so as to be liftable. The lifting guide 8 is fixed to the punch mounting base 3 and the guide pin 10 that is erected on the plate pressing plate 7.
And a guide sleeve 11 fitted so as to be movable up and down, and the guide pin 10 is biased downward by an elastic body 12 loaded in the guide sleeve 11. Guide pin 1
In No. 0, the enlarged head portion 10a engages with the bottom wall of the guide sleeve 11 to regulate the descending end. The elastic body 12 is composed of a coil spring or the like. The plate pressing plate 7 has a through hole 13 in the center thereof which allows the punch tool body 4 to penetrate therethrough, and has a ring shape.

The die tool 2 has a die 6 fixed on a die holder 5, and the die 6 is provided with a circular machining hole 6a for fitting with the first cutting blade portion 21 of the punch tool 1. . The die holder 5 is installed on the lower die installation base 32. A ring-shaped plate material support board 14 surrounding the die 6 is provided on the die holder 5, and the plate material support board 14 is urged upward by support springs 15 provided at a plurality of circumferential positions on the die holder 5 and at the same time. Guide pins 16 are provided upright at a plurality of positions in the circumferential direction so as to be vertically movable. Guide pin 1
6 is a guide hole 1 with a counterbore provided in the plate supporting board 14.
The upper end of the plate support board 14 is regulated by fitting in 7 and engaging the pin head with the bottom surface of the counterbore. At this rising end, the plate supporting board 14 is at a height position slightly above the upper end surface of the die 6. The wood plate W to be processed is fed to the front, rear, left and right by a plate feed mechanism (not shown) on a table (not shown) of the punch press machine at a position slightly above the upper surface of the die 6.

The operation of the above configuration will be described. Punch tool 1
2 is in the ascending standby position, the second cutting blade portion 25 of the preceding hole punch member 24 is moved to the punch tool body 4 as shown in FIG.
Of the first cutting blade portion 21 is projected downward and the plate pressing plate 7 is located slightly below the first cutting blade portion 21. When the punch tool 1 is lowered in this state,
First, as shown in FIG. 3A, the first cutting blade portion 25 is a plate material W.
The leading hole punch member 24 is pushed into the punch body 4 against the spring 28. Also, the plate material W
Is pushed down from the floating and supported state by the plate supporting board 14 (FIG. 2) and placed on the upper surface of the die 6. When the preceding hole punch member 24 enters until it engages with the bottom surface of the plate material release recessed portion 22, no further entry is possible, and the preceding hole punch member 24 descends together with the punch tool body 4 and the second cutting blade portion. The opening of the preceding hole a by 25 is started. Shortly before the start of this punching, the plate pressing plate 7 presses the upper surface of the plate material W by the urging force of the elastic body 12.

As the punching tool 1 further descends, as shown in FIG.
As shown in (C), the first cutting blade portion 21 of the punch 20.
Thus, the plate material W is perforated to the target diameter. At this time,
The second cutting blade portion 25 of the preceding hole punch member 24 is always in a state of protruding more than the first cutting blade portion 21 of the punch tool body 4, and therefore the first cutting blade portion 21 having a large diameter is used. Will open the outer periphery of the portion where the preceding hole a is formed. Therefore, the cut piece Wa of the plate material W can be bent inward and can escape into the preceding hole a, and an unreasonable load on the plate material W can be avoided. The second cutting blade portion 25 is contained in the leading hole a, and the small-diameter shaft portion 2 following the blade portion 25 is provided.
Since a gap is formed on the outer periphery of 4b, the cutting piece Wa can be bent inward. As a result, even when the plate material W has a large plate thickness or is used for punching with a large hole diameter, it is possible to easily finish the work with good finish. Further, since the punch 20 is formed with the plate material escaping recess 22 and the cutting piece Wa escapes into the dent 22, the plate material W is not subjected to an unreasonable load, and the dent 22 is provided. Unlike a punching tool that is not provided, the punch hole H is prevented from being scratched and the finish is improved. further,
During this processing operation, the plate material W is pressed by the plate pressing plate 7 around the punched portion, so that the processing is performed stably and the finish is further improved.

The first cutting blade portion 21 of the punch tool body 4
When the plate material W penetrates through the plate material W, the cut pieces Wa are completely separated from the plate material W and fall into the die 6. At this time, the cutting pieces W are press-fitted into the plate material escaping recesses 22 of the punch 20.
As a result, the spring 28 biases the plate material out of the recess 22. Depending on the plate thickness, as shown in FIG. 4, when the first cutting blade portion 21 has completed drilling, the second cutting blade portion 2
5 is in a state of penetrating the cut piece W of the plate material W, but at this time, the cut piece Wa is extruded by the slag dropping piece 26 of the preceding hole punch member 24. Therefore, the cutting pieces Wa are prevented from remaining on the punch tool body 4, and the cutting pieces Wa do not adversely affect the subsequent punching work, and the smooth punching is continuously performed. When the punch tool main body 4 descends to the bottom dead center, the punch tool main body 4 comes out of the plate material W by returning to ascend, and the punch hole H is machined in the plate material W as shown in FIG.

FIG. 5 shows another embodiment of the present invention. In this example, the plate material escape recess 22 of the punch 20 is a tapered hole whose inner side is narrowed, and the outer diameter surface of the first cutting blade portion 21 is a tapered surface. The punch 20 does not have the shank portion 20a in the example of FIG. 1, but has the upper end fitted into the fitting recess 27a of the punch holder 18. The other structure is the same as that of the above embodiment. In the case of this configuration, as in the case of the above-described embodiment, various effects such as that the hole diameter is large and the hole can be punched well even if the plate thickness is large can be obtained. In each of the above-mentioned embodiments, the second cutting blade portion 25 of the preceding hole punch member 24 is used.
Although it is a rhombus, the blade portion 25 may have various other shapes, for example, a circular shape.

[0015]

According to the punching tool of the wood plate material of the present invention, the punching tool body having the first cutting blade portion at its tip and the second cutting blade portion further projecting inside the punching tool body. Due to the provision of and, a hole that is smaller than the hole of the target diameter is formed, and then the hole is processed around it.Therefore, an unreasonable load does not act on the plate material, and a large-diameter hole or thick hole is formed. Even in the case of the plate material, it is possible to perform punching with a good finish. In the case of the invention of claim 2, since the plate material escape recess is formed in the tip end surface of the punch tool body, the cut piece of the plate material can escape into the recess, and the finish of the punch hole is further improved, and the exit The part is prevented from being crispy. In addition, since the preceding hole punch member can be moved back and forth with respect to the punch tool body and the slag drop piece is provided in the plate material release recess, the cut piece of the plate material that has entered the plate material release recess along with the punch operation is slag dropped. It can be extruded in one piece, so that the cutting pieces are prevented from remaining in the punch tool and adversely affecting the subsequent machining. According to the third aspect of the present invention, the periphery of the punched portion of the plate material can be pressed by the plate pressing plate during the punching process, so that the punching process is stabilized and the finish of the punch hole is further improved.

[Brief description of drawings]

FIG. 1A is a vertical sectional view showing a punch tool according to an embodiment of the present invention, and FIG. 1B is an exploded perspective view showing the punch tool.

FIG. 2 is a partially cutaway front view showing a die installation portion of a punch press machine equipped with the punch tool.

FIG. 3 is an explanatory view showing a punching operation by the punch tool.

FIG. 4 is an explanatory view showing a working operation of a plate material having a plate thickness different from that of FIG. 3 by the punch tool.

FIG. 5 is a sectional view of a punch tool according to another embodiment of the present invention.

[Explanation of symbols]

1 ... Punch tool, 3 ... Punch mount, 4 ... Punch tool body, 7 ... Plate pressing plate, 12 ... Elastic body, 21 ... First
Cutting blades, 22 ... Plate material relief recesses, 23A, 23
B ... Guide hole, 24 ... Preceding hole punch member, 25 ... Second cutting blade portion, 26 ... Slag drop piece

Claims (3)

[Claims] 1. A punch tool for processing a wood plate material using a punch press machine, the punch tool body having a first cutting blade portion on the entire circumference of the tip, and a range surrounded by the cutting blade portion. A punch tool for a wood board, comprising: a preceding hole punch member having a second cutting blade portion projecting from the punch tool body to the tip side of the cutting blade portion. 2. A plate material escape recess is formed on the tip end surface of the punch tool main body, and an axial guide hole is formed in the bottom surface of the recess, and the guide hole has a base end side of the preceding hole punch member. 2. A slag drop piece that pushes a cut piece of a plate material by the first cutting blade portion is provided at a position inside the plate material escape recess of the preceding hole punch member, the portion being mounted so as to be able to move back and forth. Punch tool for wood board. 3. A plate holder plate for holding the punch tool main body and attached to a punch press machine, and holding a plate material around the punch tool main body,
The punching tool for wood plate material according to claim 1 or 2, wherein the punch mounting base is provided via an elastic body.