JP2000351020A - Burring die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a burring die capable of releasing a work from the burring die only by moving the work upward after the burring of a side surface of the work. SOLUTION: This burring die comprises a die main body 2 having a thick- walled part 2a and a thin-walled part 2b, a pair of pivotably attached movable dies 1 so as to be turned opposite to each other across the specified outward position on the face side of the thin-walled part 2b of the die main body 2, and split holes 7a, 7b in which a lower corner part of a boundary surface 2d and a surface 1a opposite to the movable dies 1 is passed through the die main body 2 to form one die hole 7 in the condition where a pair of movable dies 1 are closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a burring process, which comprises performing burring on a side surface of a workpiece.
The present invention relates to a burring mold in which a burring protrusion formed on a workpiece can be moved upward without being locked in a die hole.

[0002]

2. Description of the Related Art A burring process performed on a side surface of a workpiece using a conventional burring mold will be described. FIG.
As shown in FIG. 1, the conventional burring mold 15 is a simple one having only a die hole 16 at the center of a plate material. In use, a pilot hole 13a is drilled in advance at a processing position of the workpiece 17 and the inside of the workpiece 17 is placed in the burring mold 1.
5 and punched out from the outside to the inside with a punch 12 of a press, and the pilot hole 13a is opened in a cylindrical shape to form a burring hole 13. However, the burring hole 13
Has a cylindrical burring protrusion 13b, and the burring protrusion 13b is provided in the die hole 16 of the burring mold 15.
Burring protrusion 13 from die hole 16.
In order to release b, the burring mold 15 must be
Or the workpiece 17 must be moved horizontally in the direction of arrow C. The horizontal movement distance is equal to or longer than the projection length L of the burring projection 13b.

In practice, the object to be subjected to burring using a burring mold is a workpiece 8 having a rectangular parallelepiped lid shape as shown in FIG. 4 or a coaxial cross section shown in FIG. There is a workpiece 17 having a burring hole 13. In the case of the workpiece 8 and the workpiece 17, the burring process is performed on a plurality of surfaces. After the burring hole 13 is formed, the burring die 15 is horizontally moved inward to remove the burring protrusion 13 b from the die hole 16. Let go.

[0004]

FIG. 12 shows a case where burring is performed on two side surfaces of the workpiece 17 at the same time.
In order to release 3b, the burring mold 15,
Alternatively, the workpiece 17 must be moved in the horizontal direction. However, the die hole 1 of the burring
Since the burring projection 13b of the workpiece 6 is fitted to the workpiece 6, the workpiece 17 cannot be moved in the horizontal direction. Even if only one burring mold 15 is moved in the horizontal direction, the burring protrusion 13b cannot be detached from the die hole 16. In other words, merely moving one of the burring mold 15 and the workpiece 17 causes the die hole 16 to move through the burring protrusion 1.
3b cannot be removed. In order to separate them, both burring dies 15 must be horizontally moved inward, or one burring mold 15 must be horizontally moved inward to move workpiece 17 horizontally. Therefore, the processing operation is time-consuming and complicated.

Further, in the workpiece 17 having a coaxial hole, as shown in FIG. 13, it is necessary to process the burring hole 13 with high precision so that the axis 18 does not shift.
However, as described above, in order to perform burring with high accuracy, the burring must be performed by fixing the two burring dies 15 to the die seat 9 so as to share the axis 18. In this case, as in the above, after the burring process, the die hole 16 cannot be detached from the burring protrusion 13b simply by moving one of the burring mold 15 and the workpiece 17. Processing operations are time consuming and complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a burring process on a side surface of a workpiece when removing a burring projection from a die hole. An object of the present invention is to provide a burring mold in which a burring mold is fixed to a die seat and a burring protrusion can be detached from a die hole only by moving a workpiece upward.

[0007]

In order to achieve the above object, a burring mold according to the present invention comprises: a die body having a substantially L-shaped cross section having a thick portion and a thin portion; The die has the same thickness as the difference in thickness between the thin portion and the die body so that it can be opened and closed by rotating opposite to a predetermined position on the surface side of the thin portion of the die body and on the outer side. A pair of movable dies axially attached, and in a state where the pair of movable dies is closed, a boundary surface at a boundary between a thick portion and a thin portion of the die body and an opposing surface of the movable die facing each other. The lower corner portion is provided with a divided hole penetrating the die body to form one die hole.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 3, a burring mold A according to the present invention mainly includes a pair of movable dies 1,
It comprises a die body 2 and pins 3. The die body 2 has a thick portion 2a and a thin portion 2b, and has a substantially L-shaped cross section. A pin hole 5 for axially attaching the movable die 1 using a pin 3 is drilled outward. A curved surface 2e is provided on both sides of a boundary surface 2d between the thick portion and the thin portion of the die body in accordance with the shape of the movable die 1. The movable die 1
Is a substantially trapezoidal flat plate having the same thickness as the thickness difference between the thick portion 2a and the thin portion 2b of the die body 2, and is a curved portion 1a chamfered for smooth sliding with a workpiece. And song 1
The movable die 1 is provided with an inclined surface 1c so that the movable die 1 does not protrude from the side surface of the die body 2 when the movable die 1 rotates by a predetermined angle. Also, a pin hole 4 for axially attaching the movable die 1 to the die body 2 using the pin 3.
Is drilled outside. The pin 3 is inserted so that the movable die 1 can be turned into the die body 2. The pin 3 is snapped to both ends so as not to fall out of the pin holes 4 and 5. A ring 6 is fitted. Further, the pair of movable dies 1 shown in FIG.
When it is rotated and closed from the state of the two-dot chain line, the boundary surface 2 between the thick part 2a and the thin part 2b of the die body 2 as shown by the solid line.
d and the lower corner of the opposing surface 1 e of the movable die 1 form one die hole 7 penetrating the die body 2. For this purpose, a split hole 7a is provided at a corner below the opposing surface 1e of the movable die 1 facing each other, and a split hole 7b is provided at the center of the die body 2.

Referring to FIG. 4, a description will be given of a case where the side surface 8a of the rectangular parallelepiped workpiece 8 is burred using the burring die A. The workpiece 8 is subjected to burring at two places per side. Therefore, the die seat 9 is provided with a total of eight burring dies A, two on each surface of the workpiece, and a pair of the burring dies A, which are arranged parallel to each other and the movable die 1 faces outward. . A screw hole 2c is provided in the lower part of the die body 2 of the burring die A, and is fixed to the die seat 9 by a bolt 10.

When burring is performed, first, as shown in FIG.
Next, as shown by a two-dot chain line, the workpiece 8 is lowered onto the burring mold A by the lifting device 11 and covered. At this time, the movable die 1 of the burring die A is in contact with the die body 2 by its own weight to form the die hole 7. During the burring process, the lifting device 11 moves the movable die 1 from the upper surface 8b of the workpiece 8 so that the die hole 7 is not divided.
Is pressed downward. Next, as shown in FIG. 6, the side surface 8a of the workpiece 8 is supported by a burring mold A from the inside and punched out from the outside to the inside by a punch 12 of a press to form a burring hole 13 in the side surface 8a. I do. The side surface 8a is provided with a pilot hole 13a in advance so that the punch 12 can easily penetrate.

Next, the workpiece 8 and the burring mold A are separated. For this purpose, the burring protrusion 13b formed as described above is detached from the die hole 7.
First, the workpiece 8 is lifted upward using the lifting device 11. At this time, as shown in FIG. 7, the burring protrusion 13b is also a part of the workpiece 8, and thus is lifted up together with the workpiece 8. By the way, the die hole 7 was not divided during the burring process because it was pressed from above, but here, the lifting / lowering device 11 that pressed the movable die 1 together with the workpiece 8 was raised. Did
The movable die 1 forming the portion of the die hole 7 fitted with the burring protrusion 13b rotates around the axis of the pin 3 as shown in FIG.
3b is detached from the die hole 7. Thereafter, the movable die 1 is rotated by its own weight, returns to the original position as shown by a two-dot chain line, comes into contact with the die main body 2, and again has the die hole 7.
Is formed, and the next workpiece 8 is received.

In the example shown above, the side surface 8a of the workpiece 8 having four side surfaces is subjected to burring. However, the cross section as shown in FIG. The burring process using the burring mold A of the present invention can be performed on the workpiece 14 having Only the embodiment up to the burring process will be described with reference to the drawings, and the embodiment from the completion of the burring process to the removal of the burring protrusion 13b from the die hole 7 will be described below. Is omitted because it is the same as the case where.

As shown in FIG. 8, two burring dies A are arranged in the die seat 9 in parallel with the movable die 1 facing outward and the die holes 7 are coaxial with each other. A screw hole 2 c is provided in a lower part of the die body, and is fixed to the die seat 9 by a bolt 10.

At the time of burring, as shown in FIG. 9, the work 14 is first held by the elevating device 11, and then, as shown by a two-dot chain line, the work 14 is Cover from above. At this time, the movable die 1 of the burring die A is in contact with the die body 2 by its own weight to form the die hole 7. In addition, the elevating and lowering device 1 is arranged so that the die hole 7 is not divided during the burring.
Numeral 1 presses the movable die 1 downward from the upper surface 14a of the workpiece 14. Next, as shown in FIG.
4 is supported by a burring mold A from the inside,
A burring hole 13 is formed in the side surface 14b by punching from the outside to the inside with the punch 12 of the press. In addition,
A pilot hole 13a is formed in the side surface 14b in advance so that the punch 12 can easily penetrate.

[0015]

As described above, according to the burring mold of the first aspect, a die body having a substantially L-shaped cross section having a thick part and a thin part, and a thick part of the die body are provided. It has the same thickness as the difference in thickness from the thin portion, and is attached to the surface of the thin portion of the die body so that it can be opened and closed by being rotated opposite to each other around a predetermined outer position. A pair of movable dies, and in a state where the pair of movable dies are closed, a boundary surface at a boundary between a thick portion and a thin portion of the die body and a lower surface of an opposing surface of the movable die facing each other. Since the corner part has a divided hole that penetrates the die body and forms one die hole, when removing the burring protrusion from the die hole in burring processing, the burring mold is fixed to the die seat. The burring protrusion by simply moving the workpiece upward. Can be removed from Therefore, even when all the side surfaces are burred at the same time, the burring protrusion can be separated from the die hole only by moving the workpiece upward, so that the processing time is shortened and the processing operation is simplified. Benefits are obtained. When a burring hole having a coaxial core is processed, two burring holes must be simultaneously formed in a workpiece after two burring dies are fixed to a die seat at a position where the die hole has a coaxial center. However, also in this case, since the workpiece is merely moved upward, the advantage that the processing time is shortened and the processing operation is simplified is obtained as described above.

[Brief description of the drawings]

FIG. 1 is a perspective view of a burring mold according to the present invention.

FIG. 2 is a front view of a burring mold according to the present invention.

FIG. 3 is a side view of a burring mold according to the present invention.

FIG. 4 is a perspective view showing an embodiment of a burring mold according to the present invention.

FIG. 5 is a front view showing an embodiment of a burring mold according to the present invention.

FIG. 6 is a sectional view showing a state in which a burring hole is formed.

FIG. 7 is a front view showing a state in which a burring protrusion is detached from a die hole.

FIG. 8 is a perspective view showing a case where a burring hole having a coaxial center is formed on a workpiece using a burring mold according to the present invention.

FIG. 9 is a front view showing a case where a burring hole having a coaxial center is formed on a workpiece using a burring mold according to the present invention.

FIG. 10 is a sectional view showing a case where a burring hole having a coaxial center is formed on a workpiece using a burring mold according to the present invention.

FIG. 11 is a diagram illustrating a case where a burring process is performed on a workpiece using a burring mold according to the related art.

FIG. 12 is an explanatory view of a case where two burring holes are formed in a workpiece using a burring mold of the related art.

FIG. 13 is a diagram illustrating a case where a burring hole having a coaxial center is formed on a workpiece using a burring mold according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Movable die 1e Opposing surface 2 Die main body 2a Thick part 2b Thin part 2d Boundary surface 7 Die hole 7a Dividing hole 7b Dividing hole

Claims (1)

[Claims] 1. A die body having a substantially L-shaped cross section having a thick portion and a thin portion, and a die having the same thickness as a difference in thickness between the thick portion and the thin portion of the die body. A pair of movable dies that are pivotally mounted on the surface side of the thin portion of the main body so as to be able to open and close while rotating opposite to each other about a predetermined position on the outside, and in a state where the pair of movable dies are closed. A boundary surface at a boundary between a thick portion and a thin portion of the die main body and a lower corner of an opposing surface of the movable die facing each other penetrate the die main body.
A burring mold having a split hole for forming one die hole.