A warm forming method for seamless tunnel pipe with large diameter-thickness ratio
A large diameter-to-thickness ratio, warm forming technology, used in forming tools, metal processing equipment, manufacturing tools, etc., can solve the problems of inability to directly form diameter-to-thickness ratio, too large tunnel tube, limited diameter ratio, etc. The production cycle, the elimination of longitudinal welds, the effect of simple and easy tooling
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[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0033] A method for thermoforming a seamless tunnel pipe with a large diameter-to-thickness ratio, comprising the following steps:
[0034] S1: Select the original pipe material, conduct mechanical performance test, wall thickness inspection, and meet the national standard of the corresponding material, intercept a part of the seamless pipe blank 1 from the selected original pipe material, clean it, and remove surface oil and impurities;
[0035] S2: heating the upper mold half A2 and the lower mold half A7 through the heating coil 3, and the upper mold half A2 and the lower mold half A7 can form a cavity A10;
[0036] S3: The first corrugation of the tube blank 1 is formed; open the upper half mold A2 and the lower half mold A7, place the tube blank 1, close the upper half mold A2, the lower half mold A7, place the left head 4 and th...
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