A method of hydraulic forming of pipe fittings
A technology for hydroforming and pipe fittings, applied in the field of forming pipe fittings, can solve problems such as increased manufacturing costs, and achieve the effects of reducing process costs, improving production efficiency, and simplifying manufacturing processes
Inactive Publication Date: 2017-12-05
GLOBE UNION INDAL
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Problems solved by technology
The flattening process not only increases the man-hour, but also increases the manufacturing cost because the flattening mold must be used.
Method used
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[0055] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0056] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0057] Such as Figures 1 to 3 As shown, the present invention provides a preferred embodiment of a pipe fitting hydroforming method, which mainly includes the following steps:
[0058] a. Prepare a bend pipe 10 to be formed and a hydroforming mold 20;
[0059] The bent pipe 10 to be formed is a metal pipe fitting of predetermined length, and at least a portion 11 of a circular section to be formed is formed on it; as Figures 4 to 8 As shown, the hydroforming mold 20 inc...
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The invention provides a hydraulic forming method of a pipe. The hydraulic forming method of the pipe comprises the following steps that at least one section of elbow pipe, to be formed, with the round section, and a hydraulic forming mold provided with a flat and square forming mold cavity are prepared; the elbow pipe to be formed is positioned to a lower mold body of the forming mold; an upper mold body is lowered for the first time, so that the elbow pipe to be formed is fixed; liquid is injected into the elbow pipe to be formed, exhausting is conducted, and the pressure is maintained after being increased to 5-20 bar; the upper mold body is lowered for the second time, so that the elbow pipe to be formed is flattened and shaped under the supporting of the internal hydraulic pressure till mold locking is conducted after mold assembly; second-stage increasing of the hydraulic pressure injected into the elbow pipe to be formed is conducted till the hydraulic pressure reaches 700-1000 bar, then the pressure is maintained for a period of time, the appearance of the pipe is formed, and then pressure relief is conducted; and the formed flat and square pipe is taken out by opening the mold. According to the hydraulic forming method of the pipe, a flattening procedure does not need to be additionally conducted before hydraulic forming so that the forming procedures can be simplified, the production cost can be reduced, and the forming quality can be improved. In addition, through the internal hydraulic pressure of the pipe, the outer surface of the pipe is prevented from being concaved and damaged, and thus the yield is increased.
Description
technical field [0001] The invention relates to a forming method of a pipe fitting, in particular to a method for hydroforming a metal pipe fitting through a hydroforming mold. Background technique [0002] Tube Hydroforming or Internal High Pressure Forming technology has been widely used in the automobile industry, bicycle industry, bathroom hardware industry and other industries, and has been disclosed in many patent technical documents, such as Taiwan, China Invention patent with announcement number 526102, invention patent with Taiwan patent number I227203, invention patent application with Taiwan publication number 200416080, invention patent application with Taiwan patent number I298655, and invention patent application with Taiwan publication number 201213023. [0003] At present, sanitary hardware pipe fittings, such as faucet pipe fittings, usually use the above-mentioned hydroforming technology. The design of the mold is mainly based on the shape of the product af...
Claims
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IPC IPC(8): B21D26/033B21D9/15
CPCB21D9/15B21D26/033
Inventor 廖文铭涂晋益罗文麟颜国基钟自强
Owner GLOBE UNION INDAL