JPS6054123B2 - Method for manufacturing a small diameter metal polymer tube using a double-wound tube as the outer tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a small-diameter metal polymer tube using a double-wound tube as the outer tube.

Double-wound metal tubes or metal polymerized tubes with these double-wound metal tubes as outer tubes are mass-produced by the applicant's company, and are widely used as brake pipes and fuel pipes in automobiles, and wire condenser tubes in refrigerators, etc. has been done.

By the way, the conventional process for manufacturing a polymerized tube that uses a double-wound tube as the outer circumferential tube consists of the first step of manufacturing the double-wound tube, and the step of manufacturing a separate tube inside the double-wound tube after manufacturing the double-wound tube. Since the process involved two independent processing steps: inserting the parts and drawing them out (pulling them together), this alone was inefficient and caused problems in productivity.

In addition, the conventional double-wound tube manufacturing method itself has significant drawbacks in terms of productivity. In other words, conventional methods for manufacturing double-wound tubes include Japanese Patent Publication No. 1965-1965 and Japanese Patent Publication No. 29-1965.
No. 4613, Special Publication No. 10474, Special Publication No. 10474-
No. 8508 or US Pat. No. 2,998,047, etc., these manufacturing methods involve drawing using a core metal with one end fixed inside the tubular body during continuous molding of a double-wound tubular body. As a result, when the feed processing speed during continuous forming becomes 10 to 15 degrees, heat generation occurs due to the curved winding of the tube between the rolls arranged in multiple stages, and the inner peripheral surface and core of the tube due to continuous passing. Frictional heat with the gold often caused the core metal (plug) to seize, which not only required work to be stopped, but also required a great deal of labor and expense for post-seizing treatment. Furthermore, in order to avoid plug seizure, the feeding speed has to be limited to a low value, and in any case, the productivity of the tube is significantly hindered. Therefore, an object of the present invention is to significantly shorten the process by using an extremely simple method in manufacturing a polymerized tube using a double-wound tube as the outer circumferential tube, and to dramatically increase the feed processing speed. Another object of the present invention is to provide a highly efficient manufacturing method that does not cause troubles such as seizure.

The present invention is a method for manufacturing a small-diameter metal polymer tube using a double-wound tube as the outer tube. When continuously forming the steel strip into a double-wound tubular shape, simultaneously, the inner tube member 2 is synchronously fed from the steel strip delivery side to the double-wound continuous forming position, and the inner tube is A double-wound tube body formed by successive continuous molding of the steel strip material is constructed on the outer periphery of the inner tube member in a superposed manner, with the member 2 held inside as a core material, and these inner tubes and the double-wound tube are formed in a superposed manner. The tubes are simultaneously and integrally fed out, and then, in such a polymerized state, they are passed through a heating device 5 to melt the plating film, and at least the polymerized peripheral wall surface 8 of the double-wound tube is brazed to form a tube. Provided is a method for manufacturing the polymerized tube, characterized in that:

The method of the present invention will be described in detail below with reference to the drawings. 1 is a material for double-wound pipe manufacturing, and at least one of its front and back surfaces is coated with a plating film made of copper or copper-based alloy as a solder material. The steel strip is rolled up by the uncoiler 1'' and then passed continuously between the tube-making roll groups 3, 3 to 3n, 3n arranged in multiple stages, so that it is sequentially turned into a double-wound tubular body from one end. It is molded.

In the present invention, simultaneously with this continuous forming, the inner tube member 2 made of a metal material such as steel, copper, stainless steel or aluminum is passed between the feed roll groups 4, 4 to 4n, 4n from the steel strip feeding side. The tube member 2 is fed out, and the tube member 2 is surrounded inside as a core material, and the double-wound tube body 7 is constructed by sequentially and continuously molding the steel strip material on the outside of the tube member 2 in a superimposed manner and is integrated. To. The inner tube 2 and the outer double-wound body 7 in such a superposed state are then passed through a heating device 5 made of atmospheric gas or electric induction to melt the plating film at the overlapped portion of the double-wound tube and mutually bond them. A brazed polymerized peripheral surface 8 is formed on the surface. In addition, heating equipment. The outer double-wound tube body 7 and the inner tube member 2 that have passed through the cooling device 5 are integrally sent out as a finished product 9 through a cooling device 6. Next, examples of the polymerized tube manufacturing method of the present invention will be shown below.

Example steel strip material: Material SPC-1, Width 46rn/m1, Wall thickness 0.35rr1/m Inner tube member: Material STS-Tori outer diameter 6
．． 5n1/m1 Inner diameter 2.5m/m pipe making process; Feeding speed 30mm/min (multi-roll type pipe making machine) Heat treatment; Temperature 1200'C 1 hour 4 minutes (non-oxidizing atmosphere
As a result of carrying out the experiment under the above-mentioned conditions, a small-diameter metal polymerization tube whose outer tube was a double-wound tube with an outer diameter of 8 n1/m was obtained.

In addition, in the above example, the pipe forming feed processing speed was set at 30 per minute.
Even when the temperature rose slightly, no problems such as seizure occurred.
As described above, according to the present invention, when manufacturing a double-wound tube, in parallel with the continuous forming of a double-wound tube using the steel strip material 1, the inner tube member is simultaneously wrapped inside as a core material. The double-wound tube body is formed by sending out the inner tube member in one body and superimposing it on the outside of the inner tube member.

That is, according to the present invention, the inner pipe member which is a constituent member of the polymerized pipe is used as the core material, and the steel strip for double winding is continuously molded into a tubular shape and fed out as one piece, so there is no need for an inner core bar at all. Therefore, there is no risk of seizure caused by heat effects on the core metal as in the past, and the processing speed of continuous molding is significantly increased, resulting in a marked improvement in productivity. On the other hand, in the method of the present invention, the production of a double-wound tube and the production of a polymerized tube using the double-wound tube as an outer tube can be carried out simultaneously. This provides an excellent advantage in that the productivity is significantly improved synergistically.

[Brief explanation of drawings]

FIG. 1 is a route diagram showing a method for manufacturing a small-diameter metal polymer tube using a double-wound tube as an outer tube according to an embodiment of the present invention; FIG.
3 and 4 are enlarged end views of the cut portions taken along lines A-A, B-B and C-C in FIG. 1, respectively. 1... Steel band material, 2... Inner pipe member, 5
... Heating 6 ... Cooling device, 7 ...
...Double wound tube body, 8...Soldered polymerized peripheral surface.

Claims (1)

[Claims] 1. In a method for manufacturing a small-diameter metal polymer tube using a double-wound tube as the outer tube, a steel strip 1 with a plating film as a brazing material applied to at least one of the front and back surfaces is sent out as a double-wound tube material, and this is sequentially When continuously forming into a double-wound tubular shape, in parallel with this, the inner tube member 2 is synchronously fed from the steel strip delivery side to the double-wound continuous forming position, and the inner tube member 2 is A double-wound tube body is constructed by sequentially and continuously molding the steel strip material on the outer periphery of the inner tube member, with the inner tube being held inside as a core material, and these inner tubes and the double-wound tube body are formed in a polymerized manner. The tube is formed by simultaneously and integrally sending out the tubes, and then passing them through a heating device 5 in such a polymerized state to melt the plating film and brazing at least the polymerized peripheral wall surface 8 of the double-wound tube. A method for manufacturing the polymerized tube.