JP2003220426A - Method for boring hollow material and device for boring hollow material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce generation of droop during boring in spite of providing a clearance to satisfy workability during detaching/attaching of a core die and a hollow material in a method for boring both faces of one surface and the opposing other surface of the hollow material by inserting the core die into the hollow material, and a device for boring the hollow material. <P>SOLUTION: In the method for boring both faces of one surface 1a and the other surface 1b opposing to the one surface 1a of the hollow material 1 by inserting the core die 2 into the hollow material 1 and by moving a first punch 11 and a second punch 21 to advance in the opposite direction of the first punch 11, after one surface 1a is blanked by advancing the first punch 11 toward the core die 2, the other surface 1b is blanked by advancing the second punch 21 toward the core die 2, after that, the first punch 11 and the second punch 21 are retreated. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for inserting a core die into a hollow material and making a hole in both surfaces of the hollow material facing the other surface and a hollow material punching device.

[0002]

2. Description of the Related Art Conventionally, as described in Japanese Utility Model Application Laid-Open No. 59-106636, a core die is fitted in a hollow material, and holes are simultaneously formed in both surfaces of the hollow material facing the other surface. A boring device is known. Examples of such a hollow material punching device include a core die having cutting edges machined at both ends, two punches that are arranged to face the cutting edges and are movable in the horizontal direction, and punches, respectively. It is configured to include two drivers that are in contact with each other at an inclined surface of 45 ° and are movable in the vertical direction. When the two dies move vertically downward at the same time after the core die is inserted into the hollow material, the two punches move horizontally toward the core die respectively, and the two punches on both ends of the core die are moved. With the cutting blade and the two punches, two holes are punched in the hollow material at the same time.

[0003]

However, in the above-mentioned conventional techniques, it is generally necessary to provide a clearance between the hollow material and the core die in consideration of the detachability of the hollow material and the variation in dimensions. Therefore, there is a risk that the burrs for this clearance may occur after drilling.

In addition, the core die (and the hollow material) can be formed by inserting the core die into the hollow material so as to eliminate the clearance and then expanding the core die, or by precisely manufacturing the core die and the hollow material. In addition to the increase in the manufacturing cost, the detachability between the core die and the hollow material is significantly reduced, which may complicate the work. Further, in the method of providing a clearance satisfying the detachability of the core die and the hollow material and making the core die on one side of the hollow material in each case to eliminate the clearance for each side, at least two sides are formed. This required a punching press step twice, which was against the efficiency of the work.

Therefore, the present invention has been made in view of the above circumstances, and a method of inserting a core die into a hollow material and making a hole on both surfaces of the hollow material opposite to one surface thereof, and In a hollow material boring device, it is a technical object to reduce the occurrence of dripping during boring even though a clearance satisfying workability is provided when the core die and the hollow material are attached and detached.

[0006]

In order to solve the above-mentioned technical problems, according to the present invention, as described in claim 1, a core die is inserted into a hollow member, and a first punch and the first punch are provided. In the method of making a hole in both of one surface of the hollow material and the other surface opposite to the one surface by the second punch that advances in the opposite direction, the first punch is advanced toward the core die. After punching one side, the second punch is advanced toward the core die to punch the other side, and then the first punch and the second punch are retracted. did.

According to the hollow material punching device of the present invention, since the hollow body is pressed against the core die in the process of advancing the first punch toward the core die, the hollow body and the core die are separated from each other. One surface of the hollow body can be punched out by the first punch with no clearance therebetween. After that, in the process of advancing the second punch toward the core die while keeping the first punch in that state, the hollow body is pressed against the opposite side of the core die. The other surface of the hollow body can be punched out by the second punch without any clearance. That is,
Despite providing a clearance that satisfies the workability when attaching and detaching the hollow body and the core die, the hollow body can be punched out when there is no clearance between the hollow body and the core die during drilling. It is possible to reduce the occurrence of drooling during drilling.

Preferably, as described in claim 2, a first punch and a first driver slidable with respect to each other on an inclined surface,
The second driver slidable on the inclined surface with respect to the second punch, the first driver and the second driver are fixed to a ram movable in the pressing direction, and the length of the first driver in the pressing direction is the same as that of the second driver. It has a structure that is set longer than the length in the pressing direction. When the ram moves in the pressing direction, the first punch and the first driver come into contact with each other on their inclined surfaces and start sliding, and then the second punch. It is desirable that the second driver and the second driver contact each other on the inclined surfaces and start sliding. According to this method, the holes on both sides of the hollow body are manufactured in one step by advancing the first punch and the second punch in one pressing step through the cam mechanism by one pressing means. Therefore, the efficiency of the drilling work can be improved.

According to a third aspect of the present invention, the first punch, the second punch that advances in a direction opposite to the first punch, and the core positioned between the first punch and the second punch. A hollow material punching device having a die and having a structure in which the first punch is advanced toward the core die to punch out the hollow material, and then the second punch is advanced toward the core. Is desirable. According to this punching device, since the hollow body is pressed against the core die in the process of advancing the first punch toward the core die, the hollow body is pressed with no clearance between the hollow body and the core die. One side of the hollow body can be punched out by one punch. afterwards,
Since the hollow body is pressed against the opposite side of the core die in the process of advancing the second punch toward the core die while keeping the state of the first punch, the clearance between the hollow body and the core die is increased. The second side can punch out the other surface of the hollow body in the absence of the hole. In other words, it is possible to punch the hollow body in the state where there is no clearance between the hollow body and the core die at the time of drilling, even though the clearance is provided to satisfy the workability when attaching and detaching the hollow body and the core die. Therefore, it is possible to reduce the occurrence of dripping during drilling.

Preferably, as described in claim 4, a first punch and a first driver slidable with respect to each other on an inclined surface,
The second driver, which is slidable on the inclined surface with respect to the second punch, integrally fixes the first driver and the second driver, and moves in the press direction perpendicular to the moving direction of the first punch and the second punch. With a ram that can be moved, the length of the first driver in the pressing direction is set to be longer than the length of the second driver in the pressing direction, and the first punch and the first driver are inclined with respect to each other by the movement of the ram in the pressing direction. It is desirable that the second punch and the second driver have a structure in which the second punch and the second driver come into contact with each other on their inclined surfaces and start sliding, after the surfaces contact each other and start sliding. In this device, when the first punch and the second punch and the first driver and the second driver respectively slidably contact each other on the inclined surfaces, the first driver and the second driver move vertically when the first driver and the second driver move. Punch and second
It has a cam mechanism that moves the punch horizontally. Therefore, the holes on both sides of the hollow body can be manufactured in one step by advancing the first punch and the second punch in one pressing step via the cam mechanism by one pressing means. Therefore, the efficiency of the drilling work can be improved.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic view showing a cross section of an embodiment of the present invention, showing a state before drilling. The hollow body 1 formed by extruding an aluminum alloy or the like is
It is supported by the table 7. Hollow body 1 in the present embodiment
Has a square pipe shape, and has one surface (surface 1a) located on the left side in FIG. 1 and the other surface (surface 1b) facing the one surface (surface 1a) (located on the right side in FIG. 1). Have Between the hollow body 1 and the base 7, if necessary,
A guide that is slidable in the horizontal direction on the table 7 and that conforms to the external shape of the hollow body 1 may be provided. Inside the hollow body 1, a core die 2 is inserted.

The core die 2 has a first cutting edge at a position corresponding to the surface 1a of the hollow body 1 (on the left side in FIG. 1) and a surface 1b.
The second cutting edge is provided at a position corresponding to (on the right side in FIG. 1). The core die 2 is fixed so as not to move during drilling, and the core die 2 and the surface 1a are so arranged that workability at the time of attaching and detaching the hollow body 1 and the core die 2 can be sufficiently satisfied.
And a clearance s2 is provided between the core die 2 and the surface 1b. Similarly,
Clearances are also provided between the core die 2 and the upper and lower surfaces of the hollow body 1.

A first punch 11 and a second punch 21 are arranged on both sides of the core die 2. The 1st punch 11 and the 2nd punch 21 are equipped with the 1st punch member 12 and the 2nd punch member 22 which oppose the 1st cutting edge 2a and the 2nd cutting edge 2b, respectively, and punch | punch the surface 1a and the surface 1b, respectively. It is like this. Further, the first punch 11 and the second punch 21 are provided with a first slider member 13 and a second slider member 23, respectively, so that they can be moved horizontally on the table 7. The first punch 11 and the second punch 21 have biasing means 15, 25 such as springs.
Is provided so that the biasing force always acts in a direction away from the core die 2.

The first punch 11 and the second punch 21 include:
First slider member 13 and second slider member 2 respectively
4 above the outside of 3 (side not facing core die 2)
5 ° inclined surfaces 13a and 23a are formed. Slopes 14a corresponding to the slopes 13a and 23a,
The first driver 14 and the second driver 24, in which 24a is formed, are arranged. The inclined surfaces 14a and 24a are
Each of the first driver 14 and the second driver 24 has an inclination of 45 ° below the inside (on the core die 2 side). Both the first driver 14 and the second driver 24 are integrally fixed to the ram 6, and the ram 6 can be moved in the vertical direction by pressing means (not shown).

When the first driver 14 and the second driver 24 move downward, the inclined surface 14a and the inclined surface 13a become
And the inclined surface 24a and the inclined surface 23a contact in order,
Since each of them slides on a surface inclined by 45 °, the first punch 11 and the second punch 21 are adapted to move horizontally toward the core die 2.
That is, the first and second drivers 14 and 24 move in the vertical direction (vertical direction), so that the first punch 11 and the second punch 21 move in the horizontal direction, respectively.

Here, in the present embodiment, the first driver 1
When the fourth driver 2 and the second driver 24 move downward, the first driver 14 and the first punch 11 come into contact with each other before the second driver 24 and the second punch 21 come into contact with each other. Specifically, the height of the first driver 14 in the pressing direction (vertical direction in FIG. 1) is longer than that of the second driver 24. (On the contrary, the heights of the first driver 14 and the second driver 24 may be the same so that the height of the first punch 11 in the pressing direction is longer than that of the second punch 21.)

Next, the operation of this embodiment configured as described above will be described with reference to FIG. Figure 2 (a)
Shows the initial state (state before drilling). As shown in FIG. 2B, when the ram 6 is moved downward by a pressing means (not shown), the first driver 14 and the second driver 24 fixed to the ram 6 simultaneously descend. As a result, first, the inclined surface 14 of the first driver 14 is
The first punch 11 is horizontally moved toward the core die 2 (to the right in FIG. 2) while a and the inclined surface 13a of the first punch 11 are in contact with each other and slide. That is, the first punch 11 advances toward the surface 1 a of the hollow material 1 and
The tip of the punch member 12 is brought into contact with the surface 1a. Then, when the first punch 11 further advances, the surface 1a is horizontally moved toward the core die 2 (to the right in FIG. 2), and the surface 1a is pressed against the core die 2. Figure 2 (b)
Shows a state in which the clearance s1 between the core die 2 and the surface 1a has disappeared.

When the ram 6 is further lowered from the state shown in FIG. 2 (b), as shown in FIG. 2 (c), the first punch 11 also advances by that amount, and the first punch member 12 and the first punch member 12 move. 1
The surface 1a of the hollow material 1 is punched by the cutting blade 2a. still,
In this state (the moment of punching), the inclined surface 24a of the second driver 24 and the inclined surface 23a of the second punch 21 are not yet in contact with each other. (Although they may be in contact with each other, it is necessary that at least the tip of the second punch member 22 and the surface 1b of the hollow member 1 be separated.)

When the ram 6 is further lowered, as shown in FIG.
As shown in (d), there is no portion where the inclined surface 14a and the inclined surface 13a are in contact with each other (after sliding is finished), and the first punch 1
The advance of 1 also stops. Further, next, while the inclined surface 24a of the second driver 24 and the inclined surface 23a of the second punch 21 are in contact with each other and slide, the second punch 21 is horizontal toward the core die 2 (to the left in FIG. 2). Can be moved. That is, the second punch 21 advances toward the surface 1b of the hollow material 1, and the tip of the second punch member 22 is brought into contact with the surface 1b. Then, when the second punch 21 further advances, the surface 1
b is horizontally moved toward the core die 2 (to the left in FIG. 2), and the surface 1b is pressed against the core die 2.
FIG. 2D shows a state in which the clearance s2 between the core die 2 and the surface 1b has disappeared.

When the ram 6 is further lowered from the state shown in FIG. 2 (d), as shown in FIG. 2 (e), the second punch 21 is advanced by that amount, and the second punch member 22 and the second punch member 22 are moved. Two
The surface 1b of the hollow material 1 is punched by the cutting blade 2b. At this time, the first punch member 12 has completed the advancement (the surface 1a
Or in contact with the first cutting edge 2a).

After that, when the ram 6 is moved upward, the first driver 14 and the second driver 24 also rise, and the first punch 11 and the second punch 21 move to ( The urging means 15, 25 (shown in FIG. 1) retracts the core die 2 in a direction away from the core die 2 and returns it to the initial position. The punched pieces of the surface 1a and the surface 1b are formed by forming air supply holes in the first punch member 12 and the second punch member 22 and forming discharge holes in the core die 2 which are known techniques. , Removed. Further, from the state shown in FIG. 2 (a) to the state shown in FIG. 2 (f),
It is a series of processes.

As described above, in the present invention, since the hollow body 1 is pressed against the core die 2 in the process of advancing the first punch 11 toward the core die 2, the hollow body 1 and the core die 2 are The surface 1a of the hollow body 1 can be punched out by the first punch 11 in the state where there is no clearance s1 between them. After that, in the process of advancing the second punch 21 toward the core die 2 with the first punch 11 kept in that state, the hollow body 1 is pressed against the opposite side of the core die 2 this time. The surface 1b of the hollow body 1 can be punched by the second punch 21 with no clearance s2 between the core die 2 and the core die 2. That is, even though the clearances s1 and s2 that satisfy the workability at the time of detaching the hollow body 1 and the core die 2 are provided, there is no clearance between the hollow body 1 and the core die 2 at the time of drilling. Since the hollow body 1 can be punched out, it is possible to reduce the occurrence of dripping during drilling.

Further, in the present invention, the first punch 11
When the first driver 14 and the second driver 24 move in the vertical direction, the first punch 14 and the second driver 24 are slidably in contact with each other, so that the first punch 11 moves. And the second punch 2
1 is a cam mechanism that moves in the horizontal direction. Therefore, the holes on both sides of the hollow body 1 are manufactured in one step by advancing the first punch 11 and the second punch 21 in one pressing step through the cam mechanism by one pressing means. Therefore, the efficiency of the drilling work can be improved.

In the above-described embodiment, the first punch member 12 and the second punch member 22 each have a circular cross section, and the punching surface thereof is a flat surface. Even if it is a punching surface of another known technique (for example, an oblique blade shape) or one punch is provided with two or more punch members, the same effect as that of the above-described embodiment is obtained. be able to. Further, the two punch members located on both sides of the core die may be arranged at offset positions without being arranged on the coaxial line, that is, after one punch punches one side of the hollow material, The other punch may punch the other side of the hollow material.

[0026]

As described above, according to the present invention,
In a method of inserting a core die into a hollow material and making a hole in both surfaces of the hollow material facing the other surface and a hollow material punching device, workability is satisfied when the core die and the hollow material are attached and detached. Despite the provision of the clearance, it is possible to reduce the occurrence of dripping during drilling.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a diagram showing an operating state of the embodiment of the present invention shown in FIG.

[Explanation of symbols]

1 hollow material 1a surface (one surface) 1b surface (other surface) 2 core die 6 rum 11 First Punch 12 First punch member 13 First slider member 14 First driver 13a, 14a inclined surface 21 second punch 22 Second punch member 23 Second Slider Member 24 Second driver 23a, 24a inclined surface s1, s2 clearance

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Claims (4)

[Claims] 1. A core die is inserted into a hollow material, and a first punch and a second punch that advances in a direction opposite to the first punch are used to move the one surface of the hollow material and the other surface facing the one surface. In the method of making holes on both sides, the first punch is advanced toward the core die to punch out the one surface, and then the second punch is advanced toward the core die. A method for punching a hollow material, comprising punching out a first surface and then retracting the first punch and the second punch. 2. A first driver slidable on the inclined surface with respect to the first punch, a second driver slidable on the inclined surface with respect to the second punch, the first driver and the second driver. Is fixed to a ram movable in the pressing direction, and the length of the first driver in the pressing direction is set to be longer than the length of the second driver in the pressing direction. After the first punch and the first driver contact each other on the inclined surfaces to start sliding, the second punch and the second driver contact each other on the inclined surfaces. The method for boring a hollow material according to claim 1, wherein sliding is started. 3. A first punch, a second punch which advances in a direction opposite to the first punch, and a core die which is located between the first punch and the second punch. A hollow material punching device having a structure in which a punch is advanced toward the core die to punch out the hollow material, and then the second punch is advanced toward the core. 4. A first driver slidable on the inclined surface with respect to the first punch, a second driver slidable on the inclined surface with respect to the second punch, the first driver and the second driver. And a ram movable in a pressing direction perpendicular to the moving directions of the first punch and the second punch, and the length of the first driver in the pressing direction is equal to that of the second driver. The length is set longer than the length in the pressing direction, and the first punch and the first driver are brought into contact with each other on the inclined surfaces to start sliding by the movement of the ram in the pressing direction, and then the second punch is pressed. 4. The hollow material punching device according to claim 3, wherein the punch and the second driver have a structure in which they contact each other on the inclined surfaces and start sliding.