JPH06526U - Metal processing pipe - Google Patents

Abstract

(57) [Summary] [Object] To provide a metal processed pipe in which the end portion of the pipe is crushed and at the same time, a seal portion which seals the crushed gap in a liquid-tight manner is formed by caulking. [Structure] Crushed portion 2 provided at the end of metal pipe 1
In addition, the seal portion 3A for liquid-tightly sealing the crushed gap 2a.
By providing 3C by crimping, the liquid is prevented from entering the pipe. The seal part is
It may be provided in a straight line, a curved line or a zigzag line shape across the crushed portion. Further, the seal portions may be provided at a plurality of places spaced at arbitrary intervals.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a processing pipe having a crushed portion for connecting and assembling at its cut end, and during finishing processing such as plating and painting, a liquid such as machining liquid or washing water enters the pipe through the crushing gap. The present invention relates to a metal-processed pipe that is subjected to a simple end-sealing process in order to prevent the above problems and solve the problem of early corrosion of the pipe due to the residual liquid in the pipe.

[0002]

[Prior art]

 As a measure to prevent the above-mentioned early corrosion of the pipe, the liquid such as water that has once invaded is discharged from the drain hole provided in the pipe, or the crushed part is crushed prior to crushing the pipe. A method of applying a liquid or solid sealing material on the inside has been adopted.

[0003]

[Problems to be solved by the device]

 However, the method of providing the water drainage hole in the pipe is too inefficient and inefficient, resulting in high processing cost, and it is difficult to completely drain the liquid. Further, the method of applying a sealing material to the inner surface of the crushed portion is rational because it can reliably prevent the liquid from entering the pipe, but it has a drawback that it requires extra labor and cost for the sealing process. Therefore, the purpose of the present invention is to perform a liquid-tight seal treatment by crimping at the same time as the crushing process of the end of the pipe, which is different from the conventional technique, and it is troublesome and costly to provide a water drainage hole in the pipe or provide a sealing material. The purpose is to provide a metal processed pipe that can be omitted.

[0004]

[Means for Solving the Problems]

 The metal working pipe according to the present invention for achieving the above object is a metal pipe whose end portion is flatly crushed, and the crushing gap 2a is liquid-tightly sealed in the crushing portion 2 of the metal pipe 1. The seal portions 3A to 3C are provided by crimping so as to prevent the liquid from entering the pipe. The seal portions 3A to 3C are preferably provided in a straight line, a curved line or a zigzag line shape across the crushed portion 2. Further, the seal portions 3A to 3C may be provided at a plurality of places spaced at arbitrary intervals.

[0005]

[Action]

 Since the crushed portion 2 provided at the end of the metal pipe 1 is provided with seal portions 3A to 3C that seal the crushed gap 2a in a liquid-tight manner, when the metal pipe 1 is subjected to finish processing such as plating or painting. In addition, it is possible to reliably eliminate the possibility that the processing liquid or liquid such as washing water after processing will enter the pipe. Since the seal portions 3A to 3C are formed by swaging and caulking at the same time as the crushing process, unlike the conventional technique, the labor and cost of applying the sealing material to the inner surface of the crushed part becomes unnecessary. Alternatively, the extremely inefficient work of providing a water drainage hole in a metal pipe for draining water becomes unnecessary.

[0006]

【Example】

 A first embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Reference numeral 1 is a metal pipe such as a steel pipe, which is cut into a predetermined length for use as a frame member of a chair, for example. Then, both end portions of the metal pipe 1 are respectively pressed to provide crushed portions 2 to strengthen the structural strength of the pipe end portion and to facilitate the work of joining to another member by bolting.

Reference numeral 3A is a seal portion that prevents liquid from entering the metal pipe 1 through the crush gap 2a (see FIG. 2) generated in the crush portion 2, and forms a circular arc line shape so as to cross the crush portion 2. It is formed by performing crimping. The seal portion 3A is provided inside the bolt hole 4 formed in the center of the crushed portion 2. This crimping process can be performed simultaneously with the crushing process by providing a press die for crushing the end portion of the metal pipe 1 with a pressing blade for crimping.

Next, the operation of the above configuration will be described. The metal pipe 1 provided with the crushed portions 2 necessary for joining work to other members at both end portions is subjected to finish processing such as plating or painting in order to improve the appearance depending on the use. In that case, since the metal pipe 1 is exposed to the plating liquid, the paint for "dubsuke painting", or the washing water used in the post-process of the processing, even if the crushed gap 2a of the crushed portion 2 is slightly exposed. If there is a gap, these liquids will enter the metal pipe 1, and it will be difficult to completely remove the liquid that once entered.

However, since the metal pipe 1 of this embodiment is provided with the seal portion 3A that traverses the crushed portion 2, the liquid is surely prevented from entering the metal pipe 1. Since the seal portion 3A is formed by performing the crimping process and the crimping process at the same time as the crushing process, unlike the prior art, the labor and cost of applying the sealing material to the inside of the crushed part are unnecessary. Alternatively, the extremely inefficient work of draining water by providing a drain hole in the metal pipe becomes unnecessary.

3 and 4 show a second embodiment of the present invention. The metal pipe 1 of this embodiment is different from that of the first embodiment in that the seal portion 3B is formed in a zigzag line shape, and the seal portion 3B is sandwiched between the bolt holes 4 to ensure the sealing. It is located in two places. Further, by punching a punch having a diameter larger than the hole diameter into the bolt hole 4, the crush gap 2a is caulked at the peripheral edge portion 5 of the bolt hole 4, and liquid is circulated from around the hole into the crush gap 2a. Try not to enter.

5 and 6 show a third embodiment of the present invention. The difference of the metal pipe 1 of this embodiment from that of the first embodiment is that the seal portion 3C is formed in a simple linear shape, and the formation portion is located near the end of the crushed portion 2. is there. In this case, the bolt hole 4 is omitted.

In each of the above-mentioned embodiments, the metal pipe 1 may have a lateral surface of any shape other than a perfect circle.

[0013]

[Effect of device]

 As is clear from the above description, the metal processed pipe according to the present invention has the following structure as compared with the conventional metal pipe having a drain hole in the metal pipe and the seal material interposed in the crushing gap. It has excellent practical effects as listed. (A) The time and effort of providing a drainage hole in the metal pipe and the extremely inefficient work of completely discharging the liquid that has entered the metal pipe from the hole are unnecessary. (B) Prior to crushing the metal pipe, it is possible to completely eliminate the trouble and cost of applying the sealing material inside the crushed portion. (C) Caulking can be performed at the same time when crushing the end of the metal pipe, so there is no need for a separate process to seal the crushing gap, and the cost of the metal-worked pipe due to sealing can be almost ignored. .

[Brief description of drawings]

FIG. 1 is a plan view of an essential part showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of a main part of the same.

FIG. 3 is a plan view of an essential part showing a second embodiment of the present invention.

FIG. 4 is a vertical sectional view of a main part of the same.

FIG. 5 is a plan view of an essential part showing a third embodiment of the present invention.

FIG. 6 is a vertical sectional view of a main part of the same.

[Explanation of symbols]

 1 Metal Pipe 2 Crushing Part 2a Crushing Gap 3A to 3C Seal Part 4 Bolt Hole 5 Peripheral Part

Claims (3)

[Scope of utility model registration request] 1. A metal pipe having a flat end crushed, wherein a crushed portion 2 of the metal pipe 1 is provided with seal portions 3A to 3C for liquid-tightly sealing a crush gap 2a by caulking. A metal processed pipe characterized in that it prevents liquid from entering the pipe. 2. The metal working pipe according to claim 1, wherein the seal portions 3A to 3C are provided in a linear, curved or zigzag line shape across the crushed portion 2. 3. The metal working pipe according to claim 1 or 2, wherein the seal portions 3A to 3C are provided at a plurality of positions at arbitrary intervals.