阅读说明：本技术 一种内外防腐聚四氟乙烯管件的制作工艺 (Manufacturing process of internal and external anti-corrosion polytetrafluoroethylene pipe fitting ) 是由 孙开平 于 2020-07-07 设计创作，主要内容包括：本发明公开了一种内外防腐聚四氟乙烯管件的制作工艺,涉及管件的制作技术领域,包括以下步骤：(1)、管件压制；(2)、酸洗抛光；(3)、精细处理；(4)、内衬装填烧结；(5)、内衬增压定型；(6)、外层防腐处理；(7)、检验装箱。该内外防腐聚四氟乙烯管件的制作工艺在设置聚四氟乙烯内衬层时采用整体填充的方式使得成型后的聚四氟乙烯内衬层排列分布质量较好,并且无交错塌陷现象,并且采用二次增压的方式使得聚四氟乙烯内衬层能够与管件的内壁紧密压合,避免聚四氟乙烯内衬层脱落或产生形变,管件的外壁设置有四氟乙烯隔热防腐膜和聚氨酯树脂防腐涂层,聚四氟乙烯并与聚氨酯树脂形成牢固的结合,具有良好的耐磨性及抗腐蚀性。(The invention discloses a manufacturing process of an internal and external anti-corrosion polytetrafluoroethylene pipe fitting, which relates to the technical field of pipe fitting manufacturing and comprises the following steps: (1) pressing the pipe fitting; (2) acid washing and polishing; (3) fine processing; (4) filling and sintering the lining; (5) pressurizing and shaping the lining; (6) performing outer layer anticorrosion treatment; (7) and inspecting and boxing. This manufacturing technology of inside and outside anticorrosive polytetrafluoroethylene pipe fitting adopts the mode of whole packing to make the polytetrafluoroethylene inner liner after the shaping arrange the distribution quality better when setting up the polytetrafluoroethylene inner liner, and there is not crisscross phenomenon of collapsing, and the mode that adopts the secondary pressure boost makes the polytetrafluoroethylene inner liner can with the inseparable pressfitting of inner wall of pipe fitting, avoid the polytetrafluoroethylene inner liner to drop or produce deformation, the outer wall of pipe fitting is provided with thermal-insulated anticorrosive coating of tetrafluoroethylene and polyurethane resin anticorrosive coating, polytetrafluoroethylene forms firm combination with polyurethane resin, good wearability and anticorrosive nature have.)

1. A manufacturing process of an internal and external anti-corrosion polytetrafluoroethylene pipe fitting is characterized by comprising the following steps:

(1) pressing the pipe fitting;

(2) acid washing and polishing;

(3) fine processing;

(4) filling and sintering the lining;

(5) pressurizing and shaping the lining;

(6) performing outer layer anticorrosion treatment;

(7) and inspecting and boxing.

2. The manufacturing process of the inside and outside anti-corrosion polytetrafluoroethylene pipe fitting according to claim 1, wherein the manufacturing process of the inside and outside anti-corrosion polytetrafluoroethylene pipe fitting comprises the following specific steps:

(1) pipe fitting pressing

Heating a pipe fitting blank, then performing pressure control on the pipe fitting blank on a hot die forging press according to the manufacturing requirements of the pipe fitting to perform press forming on the pipe fitting, and then performing annealing treatment on the formed pipe fitting;

(2) acid pickling and polishing

Detecting the appearance and the size of the pipe fitting, pickling the pressed pipe fitting by using a pickling solution after the pipe fitting is qualified, blow-drying and detecting the pipe fitting after pickling, and performing electrolytic polishing on the surface of the pipe fitting;

(3) Fine processing of the mixture

Then, grinding to remove burrs of the pipe fitting, namely grinding the outer burrs of the pipe fitting by using an angle grinder, grinding the inner burrs of the pipe fitting by using a hole grinder, then passivating, and finally performing sand blasting on the inner surface and the outer surface of the pipe fitting;

(4) sintering of the lining

Fixing a mold core with a corresponding size to the center of the interior of the pipe fitting, filling polytetrafluoroethylene powder into a cavity between the mold core and the pipe fitting, and then performing vacuum sintering on the polytetrafluoroethylene powder on the inner side of the pipe fitting by adopting a sintering furnace to enable a polytetrafluoroethylene inner lining layer to be tightly attached to the inner wall of the pipe fitting;

(5) pressurizing and shaping the lining

Then taking out the mold core in the pipe fitting, and then carrying out secondary pressurization on the interior of the pipe fitting, wherein the pressurization is 0.6-0.8 MPa, so that the polytetrafluoroethylene inner liner layer is tightly pressed with the inner wall of the pipe fitting to realize shaping, and the polytetrafluoroethylene inner liner layer is prevented from falling off or deforming;

(6) outer layer anticorrosive treatment

Finally, coating a polytetrafluoroethylene heat-insulating anticorrosive film on the outer part of the pipe fitting, and then arranging a polyurethane resin anticorrosive coating on the outer part of the polytetrafluoroethylene heat-insulating anticorrosive film for double-layer corrosion prevention;

(7) checking and boxing

And finally inspecting the pipe fittings, boxing and warehousing.

3. The manufacturing process of the internal and external anti-corrosion polytetrafluoroethylene pipe fitting according to claim 2, characterized in that: the annealing temperature in the annealing treatment process of the pipe fitting pressing in the step (1) is 850-900 ℃, and the annealing heat preservation time is 15-20 min.

4. The manufacturing process of the internal and external anti-corrosion polytetrafluoroethylene pipe fitting according to claim 2, characterized in that: the proportion of the pickling solution for pickling and polishing in the step (2) is 20% of nitric acid, 5% of hydrofluoric acid and 75% of water, and the proportion of the passivation solution for fine processing in the step (3) is 5% of nitric acid, 2% of potassium dichromate and 93% of water.

5. The manufacturing process of the internal and external anti-corrosion polytetrafluoroethylene pipe fitting according to claim 2, characterized in that: and (4) sintering the lining filling and sintering in the step (4) at the sintering temperature of 300-450 ℃ for 6-8 h.

6. The manufacturing process of the internal and external anti-corrosion polytetrafluoroethylene pipe fitting according to claim 2, characterized in that: the pipe fitting is made of 304 stainless steel, and the density of the pipe fitting is 7.93g/cm 3.

7. The manufacturing process of the internal and external anti-corrosion polytetrafluoroethylene pipe fitting according to claim 2, characterized in that: the thickness of pipe fitting inner wall polytetrafluoroethylene inner liner is 15 ~ 20mm, and the thickness of the thermal-insulated anticorrosive membrane of polytetrafluoroethylene of pipe fitting outer wall and polyurethane resin anticorrosive coating is 2 mm.

Technical Field

The invention relates to the technical field of pipe fitting manufacturing, in particular to a manufacturing process of an internal and external anti-corrosion polytetrafluoroethylene pipe fitting.

Background

The pipe fitting is a general name of parts in a pipeline system which play roles in connection, control, direction change, flow distribution, sealing, supporting and the like. The steel pipe fittings are all pressure-bearing pipe fittings. Polytetrafluoroethylene can be used as an anticorrosive material in the pipe fitting processing process. Polytetrafluoroethylene is an artificially synthesized polymer material using fluorine to replace all hydrogen atoms in polyethylene. Has the characteristics of acid resistance, alkali resistance and various organic solvents resistance.

The existing pipe fitting manufacturing process cannot perform sufficient fine treatment on a pipe fitting, the pickling passivation step is not performed, the pipe fitting is poor in performance, burrs exist on the inner wall and the outer wall, the inner liner of the polytetrafluoroethylene pipe fitting is uneven in distribution, the attaching effect is poor, the pipe fitting is prone to falling off, the pipe fitting is corroded and damaged, and therefore the manufacturing process of the inner and outer anti-corrosion polytetrafluoroethylene pipe fitting is provided.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a manufacturing process of an internal and external anti-corrosion polytetrafluoroethylene pipe fitting, which solves the problems that the existing pipe fitting manufacturing process proposed in the background art can not carry out sufficient fine treatment on the pipe fitting, does not have the step of pickling passivation, causes poor performance of the pipe fitting and burrs on the inner wall and the outer wall, and causes corrosion damage to the pipe fitting due to the fact that lining layers are not uniformly distributed and the jointing effect is poor and the pipe fitting is easy to fall off when anti-corrosion polytetrafluoroethylene is arranged on the inner side and the outer side of the pipe fitting.

In order to achieve the purpose, the invention is realized by the following technical scheme, and the manufacturing process of the internal and external anti-corrosion polytetrafluoroethylene pipe fitting comprises the following steps:

(1) pressing the pipe fitting;

(2) acid washing and polishing;

(3) fine processing;

(4) filling and sintering the lining;

(5) pressurizing and shaping the lining;

(6) performing outer layer anticorrosion treatment;

(7) and inspecting and boxing.

Optionally, the manufacturing process of the internal and external anti-corrosion polytetrafluoroethylene pipe fitting comprises the following specific steps:

(1) pipe fitting pressing

Heating a pipe fitting blank, then performing pressure control on the pipe fitting blank on a hot die forging press according to the manufacturing requirements of the pipe fitting to perform press forming on the pipe fitting, and then performing annealing treatment on the formed pipe fitting;

(2) acid pickling and polishing

Detecting the appearance and the size of the pipe fitting, pickling the pressed pipe fitting by using a pickling solution after the pipe fitting is qualified, blow-drying and detecting the pipe fitting after pickling, and performing electrolytic polishing on the surface of the pipe fitting;

(3) fine processing of the mixture

Then, grinding to remove burrs of the pipe fitting, namely grinding the outer burrs of the pipe fitting by using an angle grinder, grinding the inner burrs of the pipe fitting by using a hole grinder, then passivating, and finally performing sand blasting on the inner surface and the outer surface of the pipe fitting;

(4) sintering of the lining

Fixing a mold core with a corresponding size to the center of the interior of the pipe fitting, filling polytetrafluoroethylene powder into a cavity between the mold core and the pipe fitting, and then performing vacuum sintering on the polytetrafluoroethylene powder on the inner side of the pipe fitting by adopting a sintering furnace to enable a polytetrafluoroethylene inner lining layer to be tightly attached to the inner wall of the pipe fitting;

(5) pressurizing and shaping the lining

Then taking out the mold core in the pipe fitting, and then carrying out secondary pressurization on the interior of the pipe fitting, wherein the pressurization is 0.6-0.8 MPa, so that the polytetrafluoroethylene inner liner layer is tightly pressed with the inner wall of the pipe fitting to realize shaping, and the polytetrafluoroethylene inner liner layer is prevented from falling off or deforming;

(6) outer layer anticorrosive treatment

Finally, coating a polytetrafluoroethylene heat-insulating anticorrosive film on the outer part of the pipe fitting, and then arranging a polyurethane resin anticorrosive coating on the outer part of the polytetrafluoroethylene heat-insulating anticorrosive film for double-layer corrosion prevention;

(7) checking and boxing

And finally inspecting the pipe fittings, boxing and warehousing.

Optionally, in the annealing treatment process of the pipe pressing in the step (1), the annealing temperature is 850-900 ℃, and the annealing heat preservation time is 15-20 min.

Optionally, the proportion of the pickling solution for pickling and polishing in the step (2) is 20% of nitric acid, 5% of hydrofluoric acid and 75% of water, and the proportion of the passivation solution for fine processing in the step (3) is 5% of nitric acid, 2% of potassium dichromate and 93% of water.

Optionally, the sintering temperature of the lining filling and sintering in the step (4) is 300-450 ℃, and the sintering heat preservation time is 6-8 h.

Optionally, the pipe fitting is made of 304 stainless steel, and the density of the pipe fitting is 7.93g/cm 3.

Optionally, the thickness of the polytetrafluoroethylene inner liner on the inner wall of the pipe fitting is 15-20 mm, and the thickness of the polytetrafluoroethylene heat-insulating anticorrosive film on the outer wall of the pipe fitting and the thickness of the polyurethane resin anticorrosive coating are 2 mm.

The invention provides a manufacturing process of an internal and external anti-corrosion polytetrafluoroethylene pipe fitting, which has the following beneficial effects: according to the manufacturing process of the internal and external anti-corrosion polytetrafluoroethylene pipe fitting, the pipe fitting is subjected to compression molding, the residual stress can be removed by adopting annealing treatment, the ductility and toughness of the pipe fitting material are increased, oil stains and oxides on the surface of the pipe fitting can be removed by acid washing, the surface cleaning purpose is realized, burrs of the pipe fitting can be conveniently removed by electrolytic polishing and grinding, a very thin, compact and good-coverage passivation film which is firmly adsorbed on the metal surface can be generated on the metal surface of the pipe fitting by passivation, and therefore the anti-oxidation capability of the pipe fitting is improved;

this inside and outside anticorrosive polytetrafluoroethylene pipe fitting's manufacture craft will adopt the mode of whole packing to make the polytetrafluoroethylene inner liner after the shaping arrange the distribution quality better when setting up the polytetrafluoroethylene inner liner, and there is not crisscross phenomenon of collapsing, and the mode that adopts the secondary pressure boost makes the polytetrafluoroethylene inner liner can with the inseparable pressfitting of the inner wall of pipe fitting, avoid the polytetrafluoroethylene inner liner to drop or produce deformation, the outer wall of pipe fitting is provided with polytetrafluoroethylene thermal-insulated anticorrosive coating and polyurethane resin anticorrosive coating, polytetrafluoroethylene forms firm combination with polyurethane resin, good wearability and anticorrosive, and the setting of double-deck anticorrosive coating can effectively improve the outside anticorrosive ability of pipe fitting, the polytetrafluoroethylene of this pipe fitting inside and outside can reach inside and outside anticorrosive purpose, thereby improve the processingquality of pipe fitting.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

A manufacturing process of an internal and external anti-corrosion polytetrafluoroethylene pipe fitting comprises the following steps:

(1) pressing the pipe fitting;

(2) acid washing and polishing;

(3) fine processing;

(4) filling and sintering the lining;

(5) pressurizing and shaping the lining;

(6) performing outer layer anticorrosion treatment;

(7) and inspecting and boxing.

The manufacturing process of the internal and external anti-corrosion polytetrafluoroethylene pipe fitting comprises the following specific steps:

(1) pipe fitting pressing

Heating a pipe fitting blank, then performing pressure control on the pipe fitting blank on a hot die forging press according to the manufacturing requirements of the pipe fitting to perform press forming on the pipe fitting, and then performing annealing treatment on the formed pipe fitting;

the annealing temperature in the annealing treatment process of pipe fitting pressing is 850-900 ℃, the annealing heat preservation time is 15-20 min, the residual stress can be removed by adopting the annealing treatment, and the ductility and the toughness of the pipe fitting material are increased;

(2) acid pickling and polishing

Detecting the appearance and the size of the pipe fitting, pickling the pressed pipe fitting by using a pickling solution after the pipe fitting is qualified, blow-drying and detecting the pipe fitting after pickling, and performing electrolytic polishing on the surface of the pipe fitting;

(3) Fine processing of the mixture

Then, grinding to remove burrs of the pipe fitting, namely grinding the outer burrs of the pipe fitting by using an angle grinder, grinding the inner burrs of the pipe fitting by using a hole grinder, then passivating, and finally performing sand blasting on the inner surface and the outer surface of the pipe fitting;

the pipe fitting is made of 304 stainless steel, the density of the pipe fitting is 7.93g/cm3, the proportion of pickling and polishing pickling solution is 20% of nitric acid, 5% of hydrofluoric acid and 75% of water, the proportion of fine treatment passivation solution is 5% of nitric acid, 2% of potassium dichromate and 93% of water, and the proportion of the pickling solution and the passivation solution is suitable for the stainless steel pipe fitting;

(4) sintering of the lining

Fixing a mold core with a corresponding size to the center of the interior of the pipe fitting, filling polytetrafluoroethylene powder into a cavity between the mold core and the pipe fitting, and then performing vacuum sintering on the polytetrafluoroethylene powder on the inner side of the pipe fitting by adopting a sintering furnace to enable a polytetrafluoroethylene inner lining layer to be tightly attached to the inner wall of the pipe fitting;

the sintering temperature of the lining filling sintering is 300-450 ℃, the sintering heat preservation time is 6-8 h, and the polytetrafluoroethylene lining layer on the inner wall of the pipe fitting can be sintered and molded by adopting a sintering mode;

(5) pressurizing and shaping the lining

Then taking out the mold core in the pipe fitting, and then carrying out secondary pressurization on the interior of the pipe fitting, wherein the pressurization is 0.6-0.8 MPa, so that the polytetrafluoroethylene inner liner layer is tightly pressed with the inner wall of the pipe fitting to realize shaping, and the polytetrafluoroethylene inner liner layer is prevented from falling off or deforming;

(6) Outer layer anticorrosive treatment

Finally, coating a polytetrafluoroethylene heat-insulating anticorrosive film on the outer part of the pipe fitting, and then arranging a polyurethane resin anticorrosive coating on the outer part of the polytetrafluoroethylene heat-insulating anticorrosive film for double-layer corrosion prevention;

the thickness of the polytetrafluoroethylene inner liner on the inner wall of the pipe fitting is 15-20 mm, the thickness of the polytetrafluoroethylene heat-insulating anticorrosive film and the polyurethane resin anticorrosive coating on the outer wall of the pipe fitting is 2mm, and the polytetrafluoroethylene on the inner side and the outer side of the pipe fitting can achieve the purpose of internal and external corrosion prevention, so that the processing quality of the pipe fitting is improved;

(7) checking and boxing

And finally inspecting the pipe fittings, boxing and warehousing.

In conclusion, the manufacturing process of the internal and external anti-corrosion polytetrafluoroethylene pipe fitting comprises the following specific steps when in use:

(1) and pipe fitting pressing: heating a pipe fitting blank, then performing pressure control on the pipe fitting blank on a hot die forging press according to the manufacturing requirements of the pipe fitting to perform press forming on the pipe fitting, and then performing annealing treatment on the formed pipe fitting;

(2) acid washing and polishing: detecting the appearance and the size of the pipe fitting, pickling the pressed pipe fitting by using a pickling solution after the pipe fitting is qualified, blow-drying and detecting the pipe fitting after pickling, and performing electrolytic polishing on the surface of the pipe fitting;

(3) And fine processing: then, grinding to remove burrs of the pipe fitting, namely grinding the outer burrs of the pipe fitting by using an angle grinder, grinding the inner burrs of the pipe fitting by using a hole grinder, then passivating, and finally performing sand blasting on the inner surface and the outer surface of the pipe fitting;

(4) and filling and sintering the lining: fixing a mold core with a corresponding size to the center of the interior of the pipe fitting, filling polytetrafluoroethylene powder into a cavity between the mold core and the pipe fitting, and then performing vacuum sintering on the polytetrafluoroethylene powder on the inner side of the pipe fitting by adopting a sintering furnace to enable a polytetrafluoroethylene inner lining layer to be tightly attached to the inner wall of the pipe fitting;

(5) and pressurizing and shaping the lining: then taking out the mold core in the pipe fitting, and then carrying out secondary pressurization on the interior of the pipe fitting, wherein the pressurization is 0.6-0.8 MPa, so that the polytetrafluoroethylene inner liner layer is tightly pressed with the inner wall of the pipe fitting to realize shaping, and the polytetrafluoroethylene inner liner layer is prevented from falling off or deforming;

(6) and outer layer anticorrosion treatment: finally, coating a polytetrafluoroethylene heat-insulating anticorrosive film on the outer part of the pipe fitting, and then arranging a polyurethane resin anticorrosive coating on the outer part of the polytetrafluoroethylene heat-insulating anticorrosive film for double-layer corrosion prevention;

(7) and checking and boxing: and finally inspecting the pipe fittings, boxing and warehousing.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.