JPH071202A - Machining method of cylindrical member - Google Patents

Abstract

PURPOSE:To provide the machining method of a cylidrical member for eliminating hand works such as chamfering, deburring, etc., requiring lots of man power and time after the formation of a cylindrical part by making preparatory formation 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, the cylindrical part 3 having the notches is formed by raising the expanded parts 1a and forming them in arcs whose diameters are than a cut diameter while setting a cutting allowance inside the expanded parts 1a except the end parts 1a. And by cutting the inner diameter 4 of the cylindrical part 3, the hand works such as chamfering, deburring, etc., requiring lots of man power and time 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 of machining a cylindrical member, and more particularly to a method of machining a cylindrical member having a notch without causing burrs.

[0002]

2. Description of the Related Art As shown in FIG. 2, when a cylindrical portion 3 having a notch 2 is formed in a part of a cylindrical member 1, the portion 3 is formed.
Turning the inner surface 4 and the like may cause burrs on the end surface 3a. It is known that this burr occurs when the angle 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 the angle is equal to or larger than the above angle.

[0003]

However, in the cylindrical member 1 in which the cylindrical portion 3 having the notch 2 in a part thereof is formed as shown in FIG. 2, the tool has a cylindrical portion 3 having the notch 2. Since it is difficult to enter inside, it is necessary to chamfer with a file etc. manually, which requires a lot of manpower and time. 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, which is preformed to prevent the formation of burrs in the step (1) and eliminates chamfering after forming a cylindrical portion which requires a lot of manpower and time.

[0004]

According to the method for processing a cylindrical member of the present invention for achieving the above object, when a cylindrical portion having a notch is formed on one end side of the cylindrical member, a part of the cylindrical member is pressed. After forming a widened portion with a notch provided by expanding at a right angle to the member by machining, raise each of the widened portions and set a cutting allowance inside the widened portion excluding the end portion. While forming a circular arc having a larger diameter than the cutting diameter, a cylindrical portion having a notch is formed, and the inner diameter of the cylindrical portion is cut to the cutting diameter.

[0005]

[Operation] In the method for processing a cylindrical member according to the present invention, first, a cylindrical member such as a circular pipe is prepared, and a part of one end side of the cylindrical member is once expanded at a right angle with the member to form an expanded portion. Then
Make a notch here. Next, a cylinder having a cutout is formed by raising the expanded portion by press working, setting a cutting allowance inside the expanded portion excluding the end portion, and forming an arc larger than the cutting diameter. Forming a tongue and groove. After that,
By cutting the inner surface of the cylindrical portion with the predetermined cutting diameter, it is possible to perform processing without causing burrs.

[0006]

1 to 4, a method of processing a cylindrical member according to the present invention will be described. First, a cylindrical member 1 such as a circular pipe is prepared, and one end of the cylindrical member 1 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, as shown in FIG. 2, the expanded portion 1a is raised by press working to form a cylindrical portion 3 having a notch 2. At this time, each cylindrical portion 3 is formed.
As shown in FIG. 3, while forming a cutting allowance s on the inner side 4 of the cylindrical portion 3 excluding both ends 3b thereof, it is formed into an arc having a radius R larger than the cutting diameter r (hence, the cylindrical member It is desirable that the wall pressure of 1 should take into consideration the cutting margin s). Finally, by cutting the inner side 4 of the cylindrical portion 3, a product having a cutting surface 5 as shown in FIG. 4 is obtained. At this time, the tangent line of the cutting surface 5 and the inner surface 4 of the cylindrical portion 3 are obtained. Since the angle θ formed by the tangent line is 135 ° or more, the burr does not occur.

[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 portion of the cylindrical member is once formed by pressing at a right angle to the member. A circular arc larger than the cutting diameter while forming a widened portion with a notch formed by widening it, and raising each of the widened portions and setting a cutting allowance inside the widened portion excluding the end portion. To form a cylindrical portion having a notch, and the inner diameter of the cylindrical portion is cut by the cutting diameter, so that the cylindrical member has a notch in part. When a cylindrical portion is formed and the inner diameter of the portion is cut, pre-forming to prevent burr formation in these series of steps is performed, so that a lot of manpower and time are required after forming the cylindrical portion. Adding a cylindrical member that eliminates manual work such as chamfering and deburring Law is effective that can provide.

[0008]

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a part of the method for processing a cylindrical member of the present invention is applied, and a part of the cylindrical member is once expanded by press working at a right angle to the member to form a notch.

FIG. 2 is a perspective view of a cylindrical member to which a part of the method for processing a cylindrical member according to the present invention is applied, and a cylindrical portion having a notch on one end side is formed.

3 is a schematic diagram showing a relationship between a part of the cylindrical member and the cutting diameter in the cylindrical member shown in FIG.

FIG. 4 is a perspective view of a cylindrical member after the inner surface of the cylindrical member has been cut. 1 cylindrical member 1a expanded portion 2 notch 3 cylindrical portion 3a end surface of cylindrical portion 4 inner surface of cylindrical portion 5 cutting surface s cutting Generation

Claims (1)

[Claims] 1. When forming a cylindrical part having a notch on one end side of a cylindrical member, a part of the cylindrical member is once expanded by press working at a right angle to the member and a notched portion is formed. After forming each of the expanded portions, a cylindrical shape having a notch is formed by forming each of the expanded portions and setting a cutting allowance inside the expanded portion excluding the end portion while forming an arc larger than the cutting diameter. A method for processing a cylindrical member, comprising forming a portion and cutting the inner diameter of the cylindrical portion with the cutting diameter.