JPS6160279A - Production of pressure container - Google Patents

Abstract

PURPOSE:To promote the elevation in productivity and pressure resistance by abutting the tapered outer peripheral inclined part of a lid member to the opening part of a cylindrical housing member then by joining with a resistance welding. CONSTITUTION:A cylindrical housing member 6 is set on a jig 5 and lid members 7, 8 are abutted to both the opening parts thereof together with electrodes 9, 10. In this case the tapered inclined part 12 of the lid members 7, 8 is abutted to the opening part of the member 6. The electrodes 9, 10 are electrified then with pressing the lid members 7, 8 and the member 6 and lid members 7, 8 are welded with resistance simultaneously. The joining strength is increased with the formation of a melt-in part 15. Due to the joining being performed in a short time the productivity is elevated. Consequently the productivity and pressure resisting are elevated at the same time with said method.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a method for manufacturing pressure vessels such as accumulators and liquid tanks used in refrigeration equipment, and particularly relates to a method for manufacturing pressure vessels that are easy to manufacture and have high pressure resistance. Regarding the method.

[Technical background of the invention and its problems]

Conventionally, a pressure vessel has been manufactured by, for example, as shown in FIG. 7, a cylindrical housing member 1 having openings at both ends and multiple joints.

However, with the above conventional welding work, it takes a long time and costs are high, and when joining by arc welding, spatter enters the pressure vessel and foreign matter is generated due to the generation of oxide scale. If this happens, there is a risk of damaging equipment such as the compressor.

It is also known to manufacture a pressure vessel by reducing the diameter of both ends of a cylindrical housing member 4 having openings at both ends by press working, as shown in FIG.

However, in this case as well, the diameter reduction process requires many steps, resulting in high manufacturing costs, and when a material such as aluminum, which has good workability, is used, pressure resistance is reduced.

[Purpose of the invention]

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a method for manufacturing a pressure vessel that has good manufacturability and can manufacture a pressure vessel with high pressure resistance.

[Summary of the invention]

The present invention is a cylindrical housing member having at least one opening, and a tapered slope formed on the outer circumference of a lid member is brought into contact with the opening, and the two are joined by resistance welding. It is possible to shorten welding work time, improve manufacturability, use iron-based materials with high pressure resistance, and obtain a sufficiently long weld length to manufacture pressure vessels with high pressure resistance. can do.

[Embodiments of the invention]

A method for manufacturing a pressure vessel according to an embodiment of the present invention will be explained based on the drawings. As shown in FIG. 1, a cylindrical housing member 6 having openings at both ends is set on a jig 5, and lid members 7 and 8 are inserted into both openings of the housing member 6.
are brought into contact with the electrodes 9.10. As shown in FIG. 2, the lid member 7.8 includes a disk portion 11, an outwardly opened tapered slope portion 12 formed on the outer periphery of the disk portion 11, and a tapered slope portion 12 connected to the slope portion 12. The outer diameter d2 of the small diameter part of the tapered inclined part 12 is formed to be equal to or less than the inner diameter 4 of the opening of the housing member 6, and the outer diameter of the large diameter part is formed of seven annular rung parts 13. The inner diameter d of the opening is made larger.

Reference numeral 11a is a hole for connecting a fluid inlet pipe or a fluid outlet pipe.

Therefore, the tapered inclined portion 2 of the lid member 7.8 comes into contact with the opening 1 of the housing member 6.

Next, the housing member 6 and the lid members 7, 8 are simultaneously resistance welded by energizing the electrodes 9, 10 while pressing the lid member. FIG. 3 shows a pressure vessel 140i manufactured in this way.
~This is a front view. As shown in FIG. 4, in the pressure vessel 14 manufactured as described above, the opening of the housing member 6 at each joint portion is slightly deformed outward due to the heating caused by the electricity supply and the pressing force by the electricity 9!9.10, and the lid is closed. Member 7.80 abutment width increases. Therefore, the width of the melt-in part 15 (joint width) is larger than the thickness of the housing member 6, and high joint strength can be obtained. Furthermore, the seven rungs 13 act as positioning stoppers during welding, but
By slightly lengthening the current application time during welding, as shown in FIG. 5, the seven rung portions 13 can also be penetrated to increase the joint width and further increase the joint strength.

Furthermore, resistance welding requires less time for welding and can be easily automated, improving manufacturability, and allows the use of iron-based materials with high pressure resistance, without reducing pressure resistance.

In addition, since filler material is not required for the welding, there is less spatter, and since the welding is performed while being constantly pressed at the tapered part, there is no gap, and even if spatter occurs, the housing member 6 It is possible to prevent intrusion into the interior.

Furthermore, since the heating time during welding is short, the generation of oxide scale can be reduced.

Note that in the embodiment described above, the tapered inclined portion 12
t-Although the case has been described in which it is formed so as to open outward, it may be formed so as to close inward as shown in FIG.

Further, although the lid members 7 and 8 and the electrodes 9 and 10 are brought into contact with the opening of the housing member 6 at the same time, the lid members 7 and 8 are
8 may be brought into contact with the opening of the housing member 6. Furthermore, it goes without saying that the present invention is also applicable to housing members having only one opening.

〔Effect of the invention〕

As explained above, the present invention brings the tapered slope formed on the outer periphery of the lid member into contact with the opening of a cylindrical housing member having at least one opening, and resistance welds the two. Since multiple connections are made, it is possible to provide a method for manufacturing a load-bearing container with good manufacturability and high pressure resistance.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing a method for manufacturing a pressure vessel according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the relationship between a cylindrical housing member and a lid member, and FIG. 3 is a longitudinal cross-section of the pressure vessel. Figure, 4th
The figure is an enlarged cross-sectional view of the main part of FIG. 3, FIG. 5 is a cross-sectional view of the main part of a joint according to another embodiment of the present invention, and FIG. 6 is a longitudinal cross-section of a lid member according to another embodiment of the present invention. The plan view, FIG. 7, and FIG. 8 are partially sectional views of a conventional pressure vessel. 6...Cylindrical housing member 7.8...Lid member 12...Tapered inclined part Agent Patent attorney Noriyuki Chika Day 6 Figure 7'gP38 Figure

Claims (1)

[Claims] A pressure vessel characterized in that a tapered slope formed on the outer periphery of a lid member is brought into contact with the opening of a cylindrical housing member having at least one opening, and the two are joined by resistance welding. manufacturing method.