Steel lining polytetrafluoroethylene tee joint and mold pressing process thereof

Abstract

The invention discloses a steel lining polytetrafluoroethylene tee joint and a mold pressing process thereof, and belongs to the technical field of steel lining tee joints. The steel lining polytetrafluoroethylene tee joint comprises a tee joint steel part, a main pipe and a branch pipe, wherein the main pipe and the branch pipe are arranged in the tee joint steel part and are communicated. The main pipe comprises a hollow round-pipe-shaped main pipe core rod and two main pipe glands. A tee joint rubber sleeve is arranged on the outer side of the main pipe core rod. A main pipe tetrafluorohydrazine short pipe is arranged on the outer side of the tee joint rubber sleeve in a sleeving manner. The branch pipe comprises a hollow round-pipe-shaped branch pipe core rod and two branch pipe glands. The outer side of the branch pipe core rod is sleeved with a tee joint rubber sleeve, and a branch pipe tetrafluorohydrazine short pipe is arranged on the outer side of the tee joint rubber sleeve in a sleeving manner. A semi-circular gap main pipe tetrafluorohydrazine short pipe and a branch pipe arc opening short pipe connected with the semi-circular gap main pipe tetrafluorohydrazine short pipe are arranged at the joint of the main pipe tetrafluorohydrazine short pipe and the branch pipe tetrafluorohydrazine short pipe. According to the steel lining polytetrafluoroethylene tee joint, automation or semi-automation can be achieved, the work efficiency is greatly improved, cost control can be refined easily, powder bridging and empty drum scrapping are avoided, the finish machining amount is reduced, powder consumption is reduced, and the product forming ratio is increased.

Description

technical field [0001] The invention relates to a steel-lined tee and its molding process, in particular to a steel-lined polytetrafluoroethylene tee and its molding process, which belongs to the technical field of steel-lined tees. Background technique [0002] At present, the general process of molding the steel-lined tee in the prior art is to put the main tube mandrel and branch mandrel molds with rubber sleeves inside the prefabricated tee steel parts, and after the positioning device, put them in the rubber mold. Fill the gap between the flange and the steel pipe with PTFE powder, then install the sealing surface mold on the sealing surface of each flange, then fill the PTFE powder into the cover mold and steel cavity respectively, and then pass the The inside of the rubber sheath is injected with water pressure or placed in an isostatic press and pressurized to form it. [0003] The above molding method is a relatively popular traditional molding process at present. ...

AI Technical Summary

Problems solved by technology

[0004] (1) Low work efficiency;

[0005] (2) The wall thickness of the lining is seriously uneven, especially at the position of the horse mouth, which is seriously thin, and the powder used for the workpiece of the same specification will have a large deviation, which is not conducive to quality control and refined cost control;

[0006] (3) Because PTFE powder is easy to agglomerate, it is easy to generate agglomeration and bridging phenomenon locally when filling the powder, and local hollowing and scrapping will occur after molding;

[0007] (4) The lining of the sealing surface is severely uneven, and the amount of turning during post-processing is large, and the loss of powder is serious;

[0008] (5) The compression ratio is relatively large, and the internal air volume is relatively large during molding and pressurization, and the rubber sleeve is easily damaged during pressurization, which will cause water ingress in the PTFE layer, and the scrap rate of the workpiece is high

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