JPS58196963A - Deburring method of thin wall pipe end - Google Patents

Abstract

PURPOSE:To attain accurate deburring of the outside edge and the inside edge of a thin wall pipe end simultaneously along a true circular locus by stretching a successively replaceable abrasive paper on the front surface of a deburring tool provided with a V-shaped circular groove whose bottom diameter is equal to the average diameter of a thin wall pipe to be deburred, and turning it simultaneously with the deburring tool, while pressing said pipe against this paper. CONSTITUTION:An abrasive paper feed roller 5 carrying a roll of an abrasive paper is provided at one side of a deburring tool 2. The abrasive paper 4 is extended over the front surface of the deburring tool 2 and is wound up on a winding roller 6 provided on the other side of the deburring tool 2 so that the abrasive paper is fed successively. The deburring tool 2 is pressed through the abrasive paper 4 against the end of a thin wall pipe 1 and is rotated together with the abrasive paper 4. As the thin pipe 1 is pressed against the rotating flexible abrasive paper 4, the abrasive paper 4 pressed on the thin wall pipe flexes along the wall 8 of an annular groove 3, while being supported by the wall 8 so that the burrs 9 formed in the end of the thin pipe 1 pressed on the thin wall pipe 1 are ground off by the abrasive paper 4.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to cutting of Zircaloy tubes used as cladding tubes for nuclear power generation equipment, lifting of thin-walled tubes with extremely strict specifications to size using high-speed cutting machines and other machine tools; This article describes a method for removing burrs on the inner and outer peripheries that occur at the edges of the sheets.

Conventionally, common pipe deburring is carried out by applying a high-speed rotating cutting tool to the pipe end surface. However, A of the thin-walled tube
When rJ is taken, a small paris occurs again due to the use of bytes. In particular, the above-mentioned Zircaloy cladding tube requires extreme specifications due to its intended use, as shown in FIG. 1, and simply machining with a cutting tool is not sufficient and additional finishing work is required. Specifically (this is the specification of Zircaloy*a+i+ tube, 41 in Figure 1 is required to be 0.05m or more F, and t in the same figure is required to be 0.12-. For this reason, conventional deburring work for Zircaloy cladding requires deburring the inner periphery and deburring the outer periphery separately. After removing the rough burr, remove the chattering scratches and re-occurring small burrs by hand using abrasive paper, and remove the burr from the north and outer periphery by attaching the abrasive paper to a piece of wood. was applied to the outer end of the rotating Zircaloy cladding tube to scrape off the outer JI4.

Therefore, in the conventional method, there were problems in that it required a large number of man-hours, had poor workability, required skill because it was manual work, and that the deburring accuracy differed depending on the operator.

The present invention has been made for the purpose of providing a method for deburring the end face of a thin-walled tube that solves the problems of the conventional method described above, and is characterized in that the deburring method matches the average diameter of the thin-walled tube that is the material to be deburred. A flexible abrasive paper that is used for progressive feeding is placed on the front surface of the receiving jig with a V-shaped cross section [1111] coated with an acid film, and stretched so that it is in sliding contact with the front surface of the receiving jig. The tool and the abrasive paper are rotated together around the central axis IIa of the circumferential groove having a V-shaped cross section, and under this condition, the tube end of the thin-walled tube is aligned with the circumferential groove so that the two can match. Here, the thin-walled tube is pressed against the abrasive paper from the front side, and along the bottom surface of the circumferential groove (A), the pars on the tube end surface are simultaneously removed from the inside and outside by the rubbing of the abrasive paper. Note that the same effect can be obtained by using a flexible polishing cloth in place of the above-mentioned polishing paper.Hereinafter, a detailed explanation will be given based on the illustrative drawings from FIG. 2 onwards.

Fig. 2 is a partially cutaway view showing one embodiment of the method of the present invention, in which a thin-walled pipe such as a Zircaloy fractured pipe is gripped by a steel pipe flang (not shown) that advances as shown by the arrow (A) in the figure. +1) into the receiving jig (2) facing the thin-walled tube (1). This receiving jig (2) can be used, for example, for the rotation of a cutting tool [ii1! A rotating body (not shown) is fixed to IIC and rotated as shown by the arrow ← in Fig. 2.

Here, (3) is the front surface of the receiving jig (2) ('#I meat pipe Ll
) side) has a V-shaped cross section (approximately inclination angle w4s”>
The groove bottom diameter and groove width of the circumferential groove (3) are set to match the average diameter and wall thickness of the thin-walled tube (1), and the center (Ll) The position is aligned with the axis (b) of the rotating body, and the souvenir thin-walled tube +1) is pushed in with the outer edge of the thin-walled tube (1) aligned with the circumferential groove (3). It takes place below.

By the way, when pushing in the thin film mentioned above, the V-shaped circumference (
1iJ-group abrasive paper(
4) Alternatively, polishing may be carried out using a polishing cloth.

That is, as shown in FIG. 4, a feeding roll (5) wrapped with abrasive paper (4) is attached to the - side of the receiving jig (2), and the abrasive paper (4) is transferred to the receiving jig (2). It is extended in front of the
This is attached to the other side of the receiving jig (2).
), so that the abrasive paper (4) is used in a sequential manner, and as shown in FIGS. 2 and 6, a circle Ii! The thin-walled tube (1) is pushed in from above the receiving jig (2) and the rotating abrasive paper (4) which is arranged in front of the first groove (3). In addition, (7) in the figure is a receiving jig (
2) shows the guide plates placed on the top and bottom edges of the front surface, and the abrasive paper (
4) while maintaining the stretched position well, the abrasive paper (4)
) plays the role of sending the products smoothly.

The thin-walled tube (1) is thus exposed to the rotating flexible abrasive paper (4).
) and the abrasive paper (
4) is bent along the wall surface (8) of the circumferential groove (3) and at the same time supported by the wall surface (8), the paris (4) at the end of the thin-walled tube (1) pressed against the abrasive paper (4) 9) is scraped off with rotating abrasive paper (4).

After removing the tube end bar 9), the thin-walled tube (1) is
Move it backward in the direction (A) against the diagram, stop the rotation of the receiving jig (2) and the abrasive paper (4) that is integrated with it, and remove the winding roll with the same length as the outer diameter of the abrasive paper (4). (6) and prepare for the next deburring operation.

Here, polish M! (4) Regarding the particle size of the abrasive on the surface, as shown in the table below, it is better to have fewer fine scratches and smaller chamfers.

Next, the results of the deburring work performed using each of the oak abrasive papers (4) according to the method of the present invention are compared with the conventional manual work and are shown in the table below.

(Margins below) As explained above, according to the present invention, deburring can be performed mechanically between the rotating receiving jig and the receiving jig by using abrasive paper or abrasive cloth that is rolled in 14 rows on the jig. This deburring tool is standardized and has a high density, making it ideal for use in applications that require a specified density, such as deburring Zircaloy snow. Since the pressing of the thin wall (through the cloth) is carried out against the V-shaped circumferential groove &C, the deburring maintains a perfect circular trajectory regardless of the roundness of the thin wall pipe and -C can be obtained without the need for -C. On the other hand, even if there is some thickness adjustment in the thin-walled tube itself, the abrasive paper with Roe's notes (7
Since the press contact is carried out through an abrasive cloth, the end of the tube will be rubbed under a certain degree of elasticity. It is possible to prevent such a situation as much as possible, and it is possible to remove burrs from the inside and outside of a thin-walled pipe at the same time, which solves all the problems in terms of workability mentioned at the beginning. This is a very suitable method for removing the burr (v+) on the tube end surface.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the specifications of the Zircaloy arytenoid tube, Fig. 2 is a partial sectional view showing one embodiment of the implementation device, Fig. 6 is an enlarged sectional view of the same, and Fig. 4 is a conception with abrasive paper attached. The front view of Figure 5 (-) (b) is a diagram for supplementary explanation of the table (Xun shows before deburring, (b) shows after deburring. (1) is a thin-walled pipe, (2) is the receiving jig, (3) is the circumferential groove, (
4) is abrasive paper, (5) is a feed roll, (0) is a take-up roll (8) is a wall of the circumferential groove (3), (9) is a paris, (0) is a circle lI!lI groove ( Center of 3). Patent applicant Sumitomo Metal Industries, Ltd.-3.

Claims (1)

[Claims] [Progressively feed the groove bottom diameter O cross section V-shaped circumferential groove on the front surface of the receiving jig]
Receive the replaceable abrasive paper or abrasive cloth used.
The receiving jig and the abrasive paper or abrasive cloth are rotated together around the center axis of the circumferential groove having a V-shaped cross section, and under this condition, the thin-walled pipe is The end is aligned with the circumferential groove so that they can match, and then the thin-walled tube is pressed against the abrasive paper or abrasive cloth from the front side, and the abrasive paper or abrasive cloth is bent along the wall of the circumferential groove. A method for removing burrs from the end surface of a thin-walled tube, characterized by removing burr from the end surface of the tube simultaneously from the inside and outside by rubbing.