JPH07100558A - Method for producing collar member - Google Patents

Abstract

PURPOSE:To improve the quality and to reduce the cost. CONSTITUTION:A burring punch is punched into a lower hole 12 made in a plate 10 to form an annular burring part 14, and the base end of the burring part 4 is cut and separated from the plate 10 by a pierce pinch 21 to form a collar member C. The outer circumferential shape of the collar member C is determined by the shape of the burring punch, and the collar member C with excellent quality can be formed because there are no factors that the collar member becomes greatly off-centered. The sheared surface to be cut and separated by the pierce pinch 21 can be chamfered by a coining die, and treated during the press forming operation, and the special working such as cutting can be dispensed with.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a collar member in which a cylindrical collar member is formed by pressing a flat plate.

[0002]

2. Description of the Related Art As a conventional method for producing a color member,
For example, a pipe material is generally cut into a predetermined length and the cut surface is chamfered by cutting as shown in FIG.

[0003]

However, in such a conventional method for producing a collar member, when the pipe material is cut, for example, a large eccentricity of the collar member occurs depending on the chucking method, and the quality is deteriorated. However, there is a problem that the cost increases due to the cutting process. The present invention has been made in view of such conventional problems, and an object thereof is to provide a method for producing a color member, which can improve quality and reduce cost.

[0004]

SUMMARY OF THE INVENTION The gist of the present invention for achieving the above object is to provide a cylindrical collar member (C) from a flat plate (10) by pressing. A production method, wherein the flat plate (1
0) is provided with a pilot hole (12) and a burring punch is driven into the pilot hole (12) to form an annular burring portion (14).
And a base end of the burring portion (14) is separated from the flat plate (10) by a piercing punch (21) to form a collar member (C).

[0005]

When the burring punch is driven into the prepared hole (12) formed in the flat plate (10), the annular burring portion (1
4) is formed. At this time, the outer peripheral shape of the color member (C), which is the final shape, is formed, and the color member (C) is formed.
There is no factor that causes a large eccentricity. Next, the base end of the burring part (14) is moved from the flat plate (10) to the piercing punch (2).
If separated in 1), the burring portion (14) is not deformed and is not largely eccentric, so that the collar member (C) having excellent quality can be formed. Further, the sheared surface separated by the piercing punch (21) can be chamfered by, for example, a coining type and processed during press working, and special processing such as cutting is unnecessary.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Each drawing shows an embodiment of the present invention. As shown in FIG. 1, first, a piercing punch (not shown) having a predetermined punch diameter is used to form the prepared hole 12 in the flat plate 10.

A burring die is used to form a ring-shaped burring portion 14 by driving a burring punch into the prepared hole 12. The inner peripheral surface of the base end of the burring portion 14 is on the sagging side, and the circumferential end surface of the burring portion 14 has a fracture surface when the prepared hole 12 is formed by the piercing punch. As shown in FIG. 2, the burring portion 14
The piercing type 20 for separating the base end of the from the flat plate 10 is
The piercing punch 21 and the piercing die 22 are provided, and a locator for fitting the burring portion 14 to the tip portion of the piercing punch 21 prior to the piercing process to position the burring portion 14 with respect to the piercing die 20. The member 25 is screwed. The outer peripheral surface of the base end of the burring portion 14 has a fracture surface.

Next, the operation will be described. A prepared hole 12 is formed in the flat plate 10 by a piercing punch (not shown).

In the burring step, a burring punch is driven into the prepared hole 12 formed in the flat plate 10 to form an annular burring portion 14. At this time, the outer peripheral shape of the collar member C, which is the final shape, is determined by the shape of the burring punch, and in this step, there is no factor that the collar member C is significantly decentered.

In the piercing process, when the locate member 25 precedes the inner fitting of the burring portion 14, the piercing die 20
The burring portion 14 is positioned with respect to. After that, the blade of the piercing punch 21 comes into contact with the base end of the burring portion 14, and the base end of the burring portion 14 is brought into contact with the flat plate 10.
Separated from. Also at this time, the burring portion 14 is not deformed and is not largely eccentric. Further, the sheared surface separated by the piercing punch 21 and the circumferential end surface at the time of burring up can be chamfered with a coining type, for example, and can be processed in a series of press workings, cutting work, etc. No special processing is required.

The circumferential end face at the time of burring up may be chamfered by another coining type before being cut off by the piercing punch 21. Further, the inner peripheral surface at the base end of the burring portion 14 is on the sagging side, and chamfering is not necessary. As shown in FIG. 3, a rubber seal R is externally fitted and used on the collar member C. A step portion 32 having a diameter larger than the general diameter is formed at a lower end portion of the manifold upper portion 31, and a step portion 36 having a larger diameter than the general diameter is formed at an upper end portion of the manifold lower portion 35. When the manifold upper portion 31 and the manifold lower portion 35 are connected, the step portion 32 and the step portion 36 form a storage portion, and the rubber member R fitted on the collar member C is fitted into the storage portion. Has been.

In the above embodiment, the piercing punch 21
Since the locating member 25 is fitted into the burring portion 14 and the burring portion 14 is positioned with respect to the piercing punch 21 in advance when the burring portion 14 is separated with the burring portion 14, the center of the burring portion 14 is concentrically and accurately. ,
The circumferential base end of the burring portion 14 can be cut off.

[0013]

According to the method of producing a collar member of the present invention, a burring punch is driven into a prepared hole formed in a flat plate to form an annular burring portion, and the base end of the burring portion is pierced from the flat plate. Since the collar member is formed by cutting with a punch, the outer peripheral shape of the collar member is determined by the shape of a burring punch, for example, so there is no factor that the collar member is significantly eccentric and quality is improved. The sheared surface separated by the piercing punch can be chamfered with a coining type and processed in the press working, for example, and no special processing such as cutting is required, thus reducing the cost. You can

[Brief description of drawings]

FIG. 1 is an explanatory view of each step of a method for producing a color member showing an embodiment of the present invention.

FIG. 2 is a front view of a piercing type showing an embodiment of the present invention.

FIG. 3 is an exploded perspective view of a mounted state of a collar member showing an embodiment of the present invention.

FIG. 4 is a perspective view of a flat plate having a prepared hole formed therein according to an embodiment of the present invention.

FIG. 5 is a sectional view of a main part of a collar member showing a conventional example.

[Explanation of symbols]

 C ... Collar member R ... Rubber seal 10 ... Flat plate 20 ... Piercing type 21 ... Piercing punch 31 ... Manifold upper part 32 ... Manifold lower part

Claims (1)

[Claims] 1. A method for producing a collar member in which a cylindrical collar member is formed by pressing from a flat plate, wherein a pilot hole is bored in the flat plate, and a burring punch is driven into the pilot hole. A method for producing a collar member, wherein an annular burring portion is formed, and a base end of the burring portion is separated from the flat plate by a piercing punch to form a collar member.