Process for forging and forming welding neck flanges for connecting pipelines

Abstract

The invention belongs to the technical field of forging of flanges and particularly relates to a process for forging and forming welding neck flanges for connecting pipelines. The process comprises the following steps: blanking, heating, preforming, forming and punching. An intermediate frequency furnace is used for heating blanks; the blanks are firstly preformed and upset into cake shapes afterbeing heated, and then the upset blanks are inversely placed into a forming die and are closed and formed; in the preforming process, a 1000T electric screw press is used for preforming and upsettingcylindrical blanks; then a neck part of a 2500T electric screw press forming die is filled by a punch; and 315T closed single-point punching is used for cutting off the connected skin and blanking. The process has the beneficial effects that accurate discharging is achieved after allowance is added to the finished product; the sizes of the forged products are uniform and controllable; stable batchproduction is realized; the production efficiency is improved; in addition, the effects of saving the cost and reducing the time consumption are achieved; and the the economic benefit is increased.

Description

technical field [0001] The invention belongs to the technical field of flange forging, and in particular relates to a process for forming a high neck flange used for pipeline connection. Background technique [0002] At present, the high-neck flanges for pipe connections are mostly formed in the form of pre-forging blank opening and hole expansion. After the final forging, the blank has a large margin and poor consistency, and the efficiency is low. It is impossible to save forging materials. Purpose, the follow-up machining increases the time and the amount of cutting tools. This kind of production cost is high, the efficiency is low and time-consuming, resulting in a relatively large amount of material, which not only increases the production cost, but also prolongs the follow-up processing time. [0003] Regarding the flange forging method, the following patent documents have been disclosed: [0004] CN110814264A discloses a flange forging process, which is characterized...

AI Technical Summary

Problems solved by technology

[0006] The shortcomings of the above two forging methods for flanges are: the margin control is relatively extensive, and the forming mold is not completely closed, the final blank has ellipse and uneven margin, and the consistency of the product cannot be guaranteed, and the overall time-consuming It needs to be long, it can't realize automatic continuous production, and it can't solve the problem of labor force

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