JPH0739948A - Burring device - Google Patents

Abstract

PURPOSE:To elevate a burring punch member while rotating the same, reduce a residual stress in the radial direction generating in the branching seat of a work, eliminate return phenomenon due to spring back and form a high precision branching seat for the improvement of quality, in a burring device for working a branching seat which constitutes the connecting part of a work to be used for a metallic tube manufacturing such as for a faucet casing. CONSTITUTION:In a burring device by which a burring is performed on the prepared hole of a work with dies 1, 2 and the burring punch member 12; a recessed part 11 is provided on a punching holder 10 directly under the prepared hole; an elevating and lowering lever 14 that moves vertically while rotating is provided on the thread part 13a of a stationary member 13 over the recessed part 11; the burring punch member 12 is provided freely attachably and detachably on the lower part of this elevating and lowering lever 14; and the burring is performed on the prepared hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burring machine for forming a branch seat as a connecting portion for a metal pipe material (also called a work or a work material) such as a water faucet casing pipe.

[0002]

2. Description of the Related Art Generally, a connecting portion of a work w used for piping is formed by forming a branch seat w2 in a prepared hole w1 in advance by a burring means as shown in FIGS. , A thin tube w3 is connected to this branch seat w2.

A burring machine of this type that has been proposed has a structure as shown in FIG.

In FIG. 4, a burring frame (not shown) in a burring machine is provided with a lower die (also referred to as a lower die) 1 and an upper die (upper die) 2 facing each other and capable of moving up and down. The arcuate surfaces 1a, 2a are horizontally formed at the joints between the upper and lower dies 1, 2.
Further, a cylindrical punching holder 3 is horizontally provided on each of the circular arc surfaces 1a and 2a along the circular arc surfaces 1a and 2a, and a part 3a of the punching holder 3 is provided on the lower die 1 and It is formed so as to be positioned on one side of the upper die 2. Further, a positioning step portion 3b is formed on the outer periphery of the punching holder 3 so as to position and insert a work (tubular material) w having a prepared hole w1, and the cam rod 4 is provided in the cylinder of the punching holder 3. Is slidably fitted horizontally. Further, a cam portion 4a is formed at one end of the cam rod 4 so as to be inclined, and the punching holder 3 in which the cam portion 4a is located is formed.
A rod-shaped burring punch 5 is fitted in the cylinder so as to be vertically movable so as to form a diverging seat w2 (see FIGS. 6 and 7) by burring in the prepared hole w1. In addition, for example, a cylinder device (not shown) is connected to one end of the cam rod 4, and the cylinder device pushes the cam rod 4 to cause the cam portion 4a of the cam rod 4 to perform a burring punch. The cam surface 5a of No. 5 is pushed up to form a branch seat w2 by burring in the prepared hole w1.

Therefore, the above-mentioned burring apparatus is
When performing burring on the prepared hole w1 of the work w,
The lower die 1 and the upper die 2 are placed apart from the punching holder 3 and are fitted to the work w on the positioning step portion 3b of the punching holder 3, and the prepared hole w1 of the work w is set in the burring punch 5. Adjust to the vertical position. After that, the lower die 1 and the upper die 2 are brought into contact with each other to sandwich the work w of the punching holder 3.

Next, a cylinder device (not shown) pushes the cam rod 4 in the horizontal direction, so that the cam portion 4a of the cam rod 4 pushes up the cam surface 5a of the burring punch 5 and the branch seat w2 by burring into the prepared hole w1. To form. Then, a punch rod (not shown) descends and pushes back the burring punch 5 floating in the vertical hole 2b of the upper die 2 to the original position, and then the lower die 1 and the upper die 2 are moved to the punching holder. 3, the processed work w of the punching holder 3 is taken out.

[0007]

However, in the above-described burring device, the burring punch 5 is pushed up by the cam portion 4a of the cam rod 4 by pushing the cam rod 4 in the horizontal direction, and the burring punch 5 is branched into the prepared hole w1. Due to the fact that w2 is formed, after the burring punch 5 is pulled out from the work w after the burring process, the branch seat w2 of the work w springs back and a return phenomenon occurs, so that the branch seat w2 by a predetermined burring is formed. Difficult to form. That is, after processing, the branch seat w of the workpiece w
2 Residual stress is generated in the radial direction and the burring punch 5
After pulling out the workpiece w from the work w, the branch seat w2 causes a return phenomenon due to spring back, and the branch seat w2 with high accuracy is produced.
Is difficult to form.

Particularly, the work w made of an elastic material causes a large radial residual stress in the branch seat w2, and the branch seat w2 causes a large spring-back return phenomenon, which results in high precision due to plastic working. Is difficult to form.

In order to solve the above-mentioned problems, the present invention raises the punch member while rotating it to give plastic deformation due to a twisting action (also referred to as an ironing action) to the pilot hole, which is generated in the radial seat of the workpiece. An object of the present invention is to provide a burring machine that forcibly reduces residual stress, eliminates a return phenomenon due to springback, forms a highly accurate branch seat, and improves quality.

[0010]

SUMMARY OF THE INVENTION The present invention is a burring machine for burring a prepared hole of a work with a die and a burring punch member, in which a recessed portion is formed in a punching holder directly below the prepared hole. An elevating rod that is raised and lowered while rotating is screwed to the threaded portion of the stationary member on the recessed portion,
A burring punch member is detachably attached to the lower part of the elevating rod, and the prepared hole is burred to form a branch seat.

[0011]

According to the present invention, when performing the burring process on the prepared hole of the work, the die is placed in advance away from the punching holder, the punching holder is fitted to the work, and the prepared hole of the work is By aligning the vertical position of the burring punch member, holding the work by the die and the punching holder, and then rotating the drive gear,
The transmission gear that meshes with the drive gear is rotated, and the lifting rod fitted to the transmission gear is rotated to ascend, and the burring punch member attached to the lifting rod is twisted in the prepared hole (ironing action). Burring is performed to form a branch seat, and then, while lowering the elevating rod, the burring punch member is lowered to the original position and separated from the recessed portion, and the die is punched by the punching holder. Away from the punching holder, take out the machined work of this punching holder,
The residual stress in the radial direction on the branch seat of the work is forcibly reduced to eliminate the return phenomenon due to springback, and a highly accurate branch seat is formed to improve the quality.

[0012]

The present invention will now be described with reference to the illustrated embodiments. The present invention will be described by assigning the same reference numerals to the same constituent members as those of the above-described specific example. 1 to 3, reference numeral 1 denotes a lower die (also referred to as a lower die) provided on a burring frame (not shown) in a burring apparatus, and an upper die (also referred to as a lower die) is provided directly above the lower die 1. (Upper mold) 2 is provided so as to face each other and can be raised and lowered,
The arcuate surfaces 1a, 2
a is formed horizontally. In addition, each of the circular arc surfaces 1a, 2
A work (tubular material) w having a plurality of prepared holes w1 is detachably fitted in a, and a punching holder 10 having a cylindrical shape is horizontally provided inside each of the arc-shaped surfaces 1 inside the work w.
a, 2a are provided, and the recesses 11 are provided in the punching holder 10 just below the prepared holes w1. The recesses 11 have a truncated cone shape. Each burring punch member 12 having a shape is formed to be housed.

The burring punch member 12 is provided with a raised portion 12a for performing a raised portion and an outer diameter D of the raised portion 12a.
At least the same diameter as 1 is slightly larger than that D2
The ironing portion 12b formed in (D1 ≧ D2) is integrally formed. The raised portion 12a and the ironing portion 12b are formed by a plurality of lands 12C which are continuous in the axial direction and are inclined in a spiral shape at a predetermined pitch in the rotational direction.

On the other hand, the flat stationary member (plate) 13 integrated with the burring frame on each of the recessed portions 11 is provided with each screw portion 13a vertically engraved therein. The screw portion 14a of each elevating rod 14 is screwed. Further, a pair of upper and lower bearings 16 are provided at intervals in a frame 15 which is integral with the burring frame above the stationary member 13, and a transmission gear 17 is freely rotatable in each bearing 16. Is fitted to. Further, each spline groove portion 17a is formed in the axial center portion of each transmission gear 17, and each spline groove portion 17a is formed.
Although the splines 14b formed on the upper portions of the elevating rods 14 slide axially in a, the transmission gears 1
It is fitted so as to rotate integrally with 7. Furthermore, the drive gears 18 are attached to the respective transmission gears 17.
Are engaged with each other, and the drive gear 18 is
7 is rotated simultaneously in the same direction. Further, the burring punch members 12 are detachably provided in the lower portions 14c of the elevating rods 14 so as to penetrate through the through holes 2a of the upper die 2 and the pilot holes w1. The punch member 12 is configured such that each of the prepared holes w1 is subjected to a burring process to form a branch seat w2.

The operation of this embodiment will be described below.
Therefore, when the burring punch member 12 burrs the prepared holes w1 of the work w, the lower die 1 and the upper die 2 are separated from the punching holder 10 in advance as shown in FIG. 3 (A). Then, the punching holder 10 is fitted into the work w, and the prepared holes w1 of the work w are aligned with the ascending / descending positions of the burring punch members 12, and the lower die 1 and the upper die 2 are brought into contact with each other. The work w of the punching holder 10 is clamped.

Next, by rotating the drive gear 18, the transmission gears 17 meshing with the drive gear 18 are rotated, and the elevating rods 14 fitted to the transmission gears 17 are rotated and lowered. Then, the burring punch members 12 are connected to the elevating rods 14 (see FIG. 3B). Then, by rotating the drive gear 18 in the reverse direction, the transmission gears 17 meshing with the drive gear 18 are rotated in the reverse direction, and the lifting rods 14 fitted in the transmission gears 17 are rotated and raised. A burring process is performed by applying a twisting action (also referred to as an ironing action) to each pilot hole w1 by each burring punch member 12 to form a branch seat w2 (see FIG. 3C). The rotation of the drive gear 18 causes the burring punch member 12 to rotate.
Since the rotational force and the pulling force are applied, the drive device becomes compact and the entire device is miniaturized. In addition, work efficiency can be increased because it is possible to simultaneously process multiple branch seats that are close to each other.

Next, the lower die 1 and the upper die 2 are separated from the punching holder 10 and the processed work w of the punching holder 10 is taken out (see FIG. 3D).

Then, again, while lowering the elevating rods 14, the burring punch members 12 are lowered to their original positions and are stored in the recessed portions 11 of the punching holder 10 separately from each other.

As described above, according to the present invention, the radial residual stress generated in the branch seat w2 of the work w is forcibly reduced to eliminate the return phenomenon due to the spring back to form a highly accurate branch seat and improve the quality. I am trying to

Particularly, according to the present invention, when each burring punch member 12 is pushed up to form each burring branch seat w2 in each prepared hole w1, the burring punch member 12 is rotated and lifted. Each pilot hole w1
The branch seat w2 is formed by burring by applying a twisting action to the spring, and the springback return phenomenon due to the residual stress in the radial direction is eliminated to form the branch seat w2 with high accuracy to improve the quality.

Although the above-described present invention has described the burring apparatus for forming each branch seat w2 in each of the plurality of prepared holes w1 of the work w, it is the only prepared hole without changing the gist of the present invention. It is free to apply to a burring machine for forming a branch seat w2 on w1.
Further, although each transmission gear 17 of the present invention has been described as being rotated by the drive gear 18, as shown by the chain line in FIG. 2, each transmission gear 17 is connected to the rack 19 as long as the gist of the present invention is not changed. Mesh with each transmission gear 1
It is free to change the design so that 7 rotates in the same direction at the same time.

[0022]

As described above, according to the present invention, in a burring machine for burring a prepared hole of a work with a die and a burring punch member, a recessed portion is formed in a punching holder directly below the prepared hole. , Screwing an elevating rod that rotates up and down on the threaded portion of the stationary member on the recessed portion, attach a burring punch member to the lower part of the elevating rod in a detachable manner, and burring the prepared hole. Since the burring punch member can reduce the residual stress generated in the branch seat of the work, it can improve the quality by eliminating the return phenomenon due to springback and forming a highly accurate branch seat. Has the excellent effect of.

[Brief description of drawings]

FIG. 1 is a sectional view of a burring device according to the present invention.

FIG. 2 is a cross-sectional view taken along the chain line AA of FIG.

FIG. 3 is a view for explaining the operation of the burring device of the present invention.

FIG. 4 is a sectional view of a burring device that has already been proposed.

FIG. 5 is a sectional view of a pipe material showing an example of a work used in a burring apparatus.

6 is a cross-sectional view taken along the chain line BB of FIG.

[Explanation of symbols]

 1 Lower Die 2 Upper Die 10 Punching Holder 11 Cavity 12 Burring Punch Member 13 Stationary Member 13a Screw Part 14 Lifting Rod 14b Spline 17 Transmission Gear 18 Drive Gear

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ninoya Okubo 1-1, Nakajima 2-chome, Kokurakita-ku, Kitakyushu, Fukuoka Prefecture Totoki Kikai Co., Ltd. (72) Inventor Shibaki, Kokurakita-ku, Kitakyushu, Fukuoka Nakajima 2-1-1 Totoki Kikai Co., Ltd. (72) Inventor Takayasu Yanagita Yuetsu Matsuo Yutaka Matsuo Kitanokyu-ku, Kitakyushu City, Fukuoka Prefecture 1-12-1 Totoki Kikai Co., Ltd. (2) 1-1-1, Nakajima, Kokurakita-ku, Kitakyushu City, Fukuoka Prefecture

Claims (3)

[Claims] 1. A burring device for burring a prepared hole of a work with a die and a burring punch member, wherein a recessed portion is formed in a punching holder directly below the prepared hole, and a recessed portion above the recessed portion. It is equipped with a lifting rod that is screwed to a threaded portion of a stationary member to move up and down while rotating, and a burring punch member that is detachably attached to a lower portion of the lifting rod and burrs the prepared hole. Burring machine to do. 2. A transmission gear fitted in a bearing of a frame,
The burring apparatus according to claim 1, further comprising a spline portion of an elevating rod fitted in a spline groove portion of the transmission gear. 3. The recesses formed in the punching holders directly below the plurality of prepared holes, and the screw parts of the stationary member on the recesses are screwed to move up and down while rotating. 2. The burring apparatus according to claim 1, further comprising: each elevating rod and each burring punch member that is detachably attached to a lower portion of each elevating rod and that performs a burring process on each prepared hole.