JPH071201A - Machining method of cylindrical member - Google Patents

Abstract

PURPOSE:To provide the machining method of a cylindrical member for eliminating hand works such as chamfering deburring, etc., requiring lots of man power and expense after the formation of a cylindrical part by making chamfering for preventing the generation of burr during a series of these processes in the case of forming the cylindrical part having notches on a part of the cylindrical member and cutting the inner diameter, etc., of this part. CONSTITUTION:In the case of forming a cylindrical part 3 having notches 2 on one end side of a cylindrical member 1, after expanding once a part of the cylindrical member 1 at right angle to the member 1 by pressing work and forming the notches 2, chamfering 1c is applied by stamping around the expanded parts 1a provided with the notches so that a slope can be formed from a face which is a cut surface to the other face side. Then, the cylindrical part 3 having the notches is formed in such a way as raising the expanded parts 1a so that it can be formed to have a nearly prescribed diameter and by cutting the inner diameter or the outer diameter of the cylindrical part 3, the hand works such as chambering, deburring, etc., requiring lots of man power and expense after forming the cylindrical part can be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing a cylindrical member,
Particularly, the present invention relates to a cutting method which does not cause burrs in a cylindrical member having a notch.

[0002]

2. Description of the Related Art As shown in FIG. 1, when a cylindrical portion 3 having a notch 2 is formed in a part of a cylindrical member 1, the portion 3 is formed.
When the inner surface 4 and the like of the above are turned by the cutting tool 5 as shown in FIG. 5, burrs may occur on the end surface 3a. This Bali is
It is known that the angle θ formed by the end surface 3a of the cylindrical portion 3 and the tangent line of the cutting surface, that is, the inner surface 4 is approximately 135 degrees or less. It is also known that it is effective to chamfer so that

[0003]

However, as shown in FIG. 1, in the cylindrical member 1 in which the cylindrical portion 3 having the notch 2 is formed, the tool has the cylindrical portion 3 having the notch 2. Since it is difficult to enter the inside of the machine, there is a problem that a lot of manpower and cost are required, such as manually chamfering with a file or the like, or after cutting, manually deburring with a file or the like. The present invention has been devised as a problem to solve the above problems, in forming a cylindrical portion having a notch in a portion of the cylindrical member, when cutting the inner diameter of the portion, a series of these It is an object of the present invention to provide a method for processing a cylindrical member that eliminates manual work such as chamfering and deburring after forming a cylindrical portion, which requires a lot of manpower and cost, by performing the chamfering that prevents the occurrence of burrs in the process of And

[0004]

A method of processing a cylindrical member according to the present invention for achieving the above object comprises:
When forming a cylindrical portion having a notch, a part of the cylindrical member is once expanded by press working at a right angle to the member to form a notch, and on the periphery of the expanded part provided with the notch, Chamfering is performed with a stamp so that it becomes a slope from the one surface to be the cutting surface to the other surface, and then the expanded portion is raised to form a cylindrical portion having a notch by shaping to have a substantially predetermined diameter. The inner diameter or outer diameter of the cylindrical portion is cut.

[0005]

[Operation] In the method for processing a cylindrical member of the present invention, a cylindrical member such as a circular pipe is first prepared, and a part of one end of the cylindrical member is once expanded at a right angle with the member to form an expanded part. Then, make a notch here. Next, the peripheral edge of the expanded portion provided with the notch is chamfered with a stamp so as to form a slope from one surface to be a cutting surface (for example, an inner surface) to the other surface side (for example, an outer surface) described later. The angle formed by the chamfer is preferably 135 degrees or more. After that, the expanded portion is raised by press working, and the inner surface is molded so as to have a substantially predetermined diameter (slightly smaller than the finish inner diameter) to form a cylindrical portion having a notch.

[0006]

EXAMPLE A method for processing a cylindrical member of the present invention will be described with reference to FIGS. 1 to 5. First, a cylindrical member 1 such as a circular pipe is prepared, and a part of one end thereof is temporarily pressed by a press working as shown in FIG. The member 1 is expanded at a right angle to form an expanded portion 1a, and a cutout 2 is provided in the portion 1a. Next, on the periphery of the expanded portion 1a provided with the notch 2 as shown in FIG. 3, one surface 1b to be a cutting surface (an inner surface in the illustrated example) to the other surface side (an outer surface in the illustrated example). ) A chamfer 1c is applied by a stamp so as to form a slope. At this time, as shown in FIG. 4, the angle θ formed by the inner surface 1b and the chamfered portion 1c is preferably 90 degrees or more, and more preferably 135 degrees or more. The chamfer may be formed not only on the periphery of the expanded portion 1a as shown in FIG. 3 but also on the portion forming the bottom of the notch 2 as shown by 2a. After the chamfering 1c and 2a described above, as shown in FIG. 5, the expanded portion 1a is raised by press working, and the inner surface 1b is molded and cut so as to have a substantially predetermined diameter (slightly smaller than the finish inner diameter). A cylindrical portion 3 having a notch 2 is formed. Finally, the inner diameter of the cylindrical portion 3 is cut, but the burr does not occur at this time.

[0007]

As described above, according to the method for processing a cylindrical member of the present invention, when forming a cylindrical portion having a notch on one end side of the cylindrical member, a part of the cylindrical member is temporarily pressed by pressing. After forming a notch by expanding at a right angle, the periphery of the expanded portion provided with the notch is chamfered with a stamp so that it becomes a slope from one surface to be the cutting surface to the other surface side, and after that, the above One feature of the cylindrical member is that the expanded portion is raised to form a cylindrical portion having a notch by shaping to have a substantially predetermined diameter, and the inner diameter or outer diameter of the cylindrical portion is cut. Form a cylindrical part with a notch in the part, and when cutting the inner diameter of the part, chamfer to prevent burrs from occurring in these series of steps Chamfering and deburring after partial formation An effect that can provide processing methods of a cylindrical member which eliminates the manual.

[0008]

[Brief description of drawings]

FIG. 1 is a perspective view of a cylindrical member in which a cylindrical portion having a notch is formed on one end side to which a method for processing a cylindrical member of the present invention is applied.

FIG. 2 is a part of a method for processing a cylindrical member according to the present invention,
A perspective view showing a state in which a part of the cylindrical member is once expanded by press working at a right angle to the member to form a notch.

FIG. 3 is a part of a method for processing a cylindrical member according to the present invention,
FIG. 2 is a perspective view showing a state in which the peripheral edge of the expanded portion provided with the notch of FIG. 2 is chamfered.

4 is a sectional view taken along line AA of FIG.

FIG. 5 is a part of a method for processing a cylindrical member according to the present invention,
FIG. 3 is a perspective view showing a state in which a cylindrical portion having a notch is formed by raising the expanded portion and shaping it into a substantially predetermined diameter as shown in FIG.

FIG. 6 is a schematic view showing an angle formed between a cylindrical portion having a notch and an end face. 1 Cylindrical member 1a Expanded portion 1c Chamfer 2 Notch 2a Chamfer 3 Cylindrical portion 3a End face 4 Cutting surface 5 Cutting tool .

Claims (1)

[Claims] 1. When forming a cylindrical portion having a notch on one end side of the cylindrical member, a portion of the cylindrical member is once expanded by press working at a right angle to the member to form a notch. The peripheral edge of the expanded portion provided with the notch is chamfered with a stamp so that it becomes a slope from the one surface to be the cutting surface to the other surface side, and then the expanded portion is raised to form a substantially predetermined diameter. A cylindrical member having a notch is formed to cut the inside diameter or the outside diameter of the cylindrical portion, and a method for processing a cylindrical member is provided.