CN108644515B - Steel lining polytetrafluoroethylene bent pipe and mould pressing process thereof - Google Patents
Steel lining polytetrafluoroethylene bent pipe and mould pressing process thereof Download PDFInfo
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- CN108644515B CN108644515B CN201810742356.0A CN201810742356A CN108644515B CN 108644515 B CN108644515 B CN 108644515B CN 201810742356 A CN201810742356 A CN 201810742356A CN 108644515 B CN108644515 B CN 108644515B
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- polytetrafluoroethylene
- bent pipe
- pipe
- tetrafluoro
- bent
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L43/00—Bends; Siphons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/003—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor characterised by the choice of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/10—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
- B29C43/183—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles the preformed layer being a lining, e.g. shaped in the mould before compression moulding, or a preformed shell adapted to the shape of the mould
- B29C43/184—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles the preformed layer being a lining, e.g. shaped in the mould before compression moulding, or a preformed shell adapted to the shape of the mould shaped by the compression of the material during moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/0017—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor characterised by the choice of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/26—Lining or sheathing of internal surfaces
- B29C63/34—Lining or sheathing of internal surfaces using tubular layers or sheathings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
- B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Laminated Bodies (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a steel lining polytetrafluoroethylene bent pipe and a mould pressing process thereof, which belong to the technical field of steel lining bent pipes and comprise two cover plates, a hollow bent round tubular bent pipe core rod and a bent pipe steel member, wherein the hollow bent round tubular bent pipe core rod is arranged between the two cover plates, the bent pipe core rod is arranged in the bent pipe steel member, a rubber sleeve is sleeved outside the bent pipe core rod, a polytetrafluoroethylene inclined pipe is sleeved outside the rubber sleeve, the polytetrafluoroethylene inclined pipe is sleeved in the bent pipe steel member, polytetrafluoroethylene short pipes are arranged at two ends of the polytetrafluoroethylene inclined pipe, a polytetrafluoroethylene ring is arranged between the polytetrafluoroethylene short pipe and the cover plates, a sealing surface mould is sleeved on the polytetrafluoroethylene ring, and the sealing surface mould is arranged between the bent pipe steel member and the cover plates and is fastened through a fastener. The invention can realize automation or semi-automation, greatly improves the working efficiency, is easy to control the refining cost, avoids the occurrence of agglomeration bridging empty drum, reduces the finishing amount, greatly reduces the powder loss, avoids the damage of rubber sleeves and improves the product forming rate.
Description
Technical Field
The invention relates to a steel lining bent pipe and a mould pressing process thereof, in particular to a steel lining polytetrafluoroethylene bent pipe and a mould pressing process thereof, and belongs to the technical field of steel lining bent pipes.
Background
At present, the general technology of steel lining elbow mould pressing in the prior art is that an elbow core rod mould sleeved with a rubber sleeve is arranged in a prefabricated elbow steel part, PTFE powder is filled in a gap between the rubber mould and a steel pipe after a positioning device is arranged, then sealing surface moulds are arranged at the positions of flange sealing surfaces at two sides, PTFE powder is respectively filled in a cover mould and a steel part cavity, and after a sealing cover is assembled, water pressure is injected into the rubber sleeve or the rubber sleeve is put into isostatic pressing equipment for pressurizing and then forming.
The above molding method is a conventional molding process which is popular at present, and has the following disadvantages due to the inherent properties of PTFE powder:
(1) The working efficiency is low;
(2) The wall thickness of the lining is seriously uneven, particularly the large arc bending part is seriously thinner, and the powder for workpieces with the same specification has larger deviation, which is not beneficial to quality control and refinement cost control;
(3) Because PTFE powder is easy to agglomerate, the agglomeration bridging phenomenon is easy to be generated locally when the powder is filled, and the partial empty scrapping phenomenon can be generated after the die pressing;
(4) The lining part of the sealing surface is uneven and serious, the turning amount is more during post-processing, and the powder loss is serious;
(5) The compression ratio is relatively large, the internal residual air amount is relatively large during compression molding and pressurizing, the rubber sleeve is easy to damage during pressurizing, and then the PTFE layer is caused to enter water, so that the rejection rate of the workpiece is relatively high.
Disclosure of Invention
The invention mainly aims to provide a steel-lined polytetrafluoroethylene bent pipe and a mould pressing process thereof, which are used for solving the technical problems in the prior art.
The aim of the invention can be achieved by adopting the following technical scheme:
the utility model provides a steel lining polytetrafluoroethylene return bend, includes two apron and sets up two hollow crooked tubular return bend plug and return bend steel spare between the apron, the return bend plug sets up in the return bend steel spare, the outside cover of return bend plug is equipped with the rubber sleeve, the outside cover of rubber sleeve is equipped with the tetrafluoro inclined tube, the tetrafluoro inclined tube is overlapped and is established in the return bend steel spare, the both ends of tetrafluoro inclined tube are equipped with the tetrafluoro nozzle stub, the tetrafluoro nozzle stub with be equipped with the tetrafluoro ring between the apron, the cover is equipped with sealed face mould on the tetrafluoro ring, sealed face mould sets up the return bend steel spare with between the apron, and through the fastener fastening.
Preferably, the inclination angle of the tetrafluoro inclined tube is determined according to the angle of the bent tube and the number of segments to be split, and the length of the longest bevel edge of the tetrafluoro inclined tube is not more than 8cm.
Preferably, the outer diameter of the tetrafluoro inclined tube is 1-2mm smaller than the inner diameter of the bent tube steel member.
Preferably, the inner diameter of the tetrafluoro short tube is the same as that of the tetrafluoro inclined tube, the outer diameter of the tetrafluoro short tube is the same as that of the tetrafluoro inclined tube, and the length of the tetrafluoro short tube is the same as that of the straight-edge section of the bent-tube steel piece and is not more than 100mm.
Preferably, the outer diameter of the tetrafluoro ring is 1mm smaller than the inner diameter of the sealing surface die, and the inner diameter of the tetrafluoro ring is the same as the inner diameter of the tetrafluoro inclined tube.
Preferably, a round hole is arranged in the center of the cover plate, and the round hole on the cover plate is communicated with the inner cavity of the bent pipe core rod in a hollow bent round pipe shape.
Preferably, the bent pipe steel member is of a bent I-shaped structure, and the sealing surface dies are arranged at two ends of the bent pipe steel member.
A mould pressing process of a steel lined polytetrafluoroethylene bent pipe comprises the following steps:
step 1: respectively pressing polytetrafluoroethylene powder into a tetrafluoro inclined tube, a tetrafluoro short tube and a tetrafluoro ring by using a molding press;
step 2: after the prefabricated bent pipe steel part is cleaned, a bent pipe core rod sleeved with rubber sleeves is arranged in the bent pipe steel part, the distance is adjusted, and sealing surfaces of the rubber sleeves at two ends are pricked by rubber bands;
step 3: filling a plurality of tetrafluoro inclined pipes in the cavity between the rubber sleeve and the prefabricated bent pipe steel part in sequence, after the positions are adjusted, filling tetrafluoro short pipes at the two ends of the tetrafluoro inclined pipes respectively, compacting, and flattening the redundant parts exposed out of the flange surfaces by using a special tool;
step 4: the method comprises the steps of sequentially installing a tetrafluoro ring and a sealing surface die at two ends of a tetrafluoro short pipe respectively, taking down a rubber band, finishing the sealing surface of a rubber sleeve, installing a cover plate, and locking by a fastener;
step 5: and (5) conveying the finished workpiece into an isostatic pressing bin for compression molding.
Preferably, the inclination angle of the tetrafluoro inclined tube is determined according to the angle of the bent tube and the number of segments to be split, the length of the longest inclined edge of the tetrafluoro inclined tube is not more than 8cm, and the outer diameter of the tetrafluoro inclined tube is 1-2mm smaller than the inner diameter of the bent tube steel piece.
Preferably, the inner diameter of the tetrafluoro short tube is the same as that of the tetrafluoro inclined tube, the outer diameter of the tetrafluoro short tube is the same as that of the tetrafluoro inclined tube, the length of the tetrafluoro short tube is the same as that of the straight edge section of the bent pipe steel piece and is not more than 100mm, the outer diameter of the tetrafluoro ring is smaller than the inner diameter of the sealing surface die by 1mm, and the inner diameter of the tetrafluoro ring is the same as that of the tetrafluoro inclined tube.
The beneficial technical effects of the invention are as follows:
1. according to the steel-lined polytetrafluoroethylene bent pipe, the manufacturing processes of the polytetrafluoroethylene inclined pipe, the polytetrafluoroethylene short pipe and the polytetrafluoroethylene ring can be automated or semi-automated, and the working efficiency is greatly improved.
2. The steel lined polytetrafluoroethylene bent pipe is produced in a standard component manufacturing mode, the thickness is determined after calculation according to the lining thickness requirement, the wall thickness of each part of the finished product is uniform, the material amount of the workpiece with the same specification and the same size is consistent, and the refined cost is easy to control.
3. According to the steel lining polytetrafluoroethylene bent pipe, the mode of directly filling powder is replaced by the mode of filling the polytetrafluoroethylene standard parts once by the lining, no gaps exist among the parts basically, and the phenomenon that powder bridging empty drums are scrapped is avoided.
4. The manufacturing of the sealing surface of the steel lining polytetrafluoroethylene bent pipe replaces the mode of directly filling polytetrafluoroethylene powder by directly putting the polytetrafluoroethylene ring, the thickness of each part of the polytetrafluoroethylene ring after pressing is uniform, the uneven condition of the sealing surface of a finished product pressed in the later working procedure is avoided, the preformed thickness of the sealing surface can be well controlled, the finish machining amount is reduced, the material amount can be accurately controlled, and the powder loss is greatly reduced.
5. According to the steel-lined polytetrafluoroethylene bent pipe, the inclined pipe, the polytetrafluoroethylene short pipe and the polytetrafluoroethylene ring are firstly pressed in a low-pressure preprocessing mode, so that the volume compression ratio is greatly reduced, the core rod can be thickened when the internal core rod is manufactured, the gas exhausted from the interior of a fluorine material in the isostatic pressing process of a post procedure is greatly reduced, the condition that a rubber sleeve is easy to damage is avoided, and the product forming rate is improved.
Drawings
FIG. 1 is a cross-sectional view of the overall construction of a preferred embodiment of a steel lined polytetrafluoroethylene tubing elbow in accordance with the present invention;
FIG. 2 is a cross-sectional view of a tetrafluoro-tube of a preferred embodiment of a steel lined polytetrafluoroethylene elbow in accordance with the present invention;
FIG. 3 is a cross-sectional view of a tetrafluoro nipple of a preferred embodiment of a steel lined polytetrafluoroethylene elbow in accordance with the present invention;
fig. 4 is a cross-sectional view of a tetrafluoro ring of a preferred embodiment of a steel lined polytetrafluoroethylene elbow in accordance with the present invention.
In the figure: 1-bent pipe steel piece, 2-sealing surface mould, 3-cover plate, 4-tetrafluoro ring, 5-tetrafluoro short pipe, 6-bent pipe core rod, 7-rubber sleeve, 8-fastener and 9-tetrafluoro inclined pipe.
Detailed Description
In order to make the technical solution of the present invention more clear and obvious to those skilled in the art, the present invention will be described in further detail with reference to examples and drawings, but the embodiments of the present invention are not limited thereto.
As shown in fig. 1, the steel-lined polytetrafluoroethylene bent pipe provided by the embodiment comprises two cover plates 3, a hollow bent circular pipe-shaped bent core rod 6 and a bent pipe steel member 1, wherein the hollow bent circular pipe-shaped bent core rod 6 and the bent pipe steel member 1 are arranged between the two cover plates 3, the bent pipe core rod 6 is arranged in the bent pipe steel member 1, a rubber sleeve 7 is sleeved on the outer side of the bent pipe core rod 6, a polytetrafluoroethylene inclined pipe 9 is sleeved on the outer side of the rubber sleeve 7, the polytetrafluoroethylene inclined pipe 9 is sleeved in the bent pipe steel member 1, polytetrafluoroethylene short pipes 5 are arranged at two ends of the polytetrafluoroethylene inclined pipe 9, a polytetrafluoroethylene circular ring 4 is arranged between the polytetrafluoroethylene short pipes 5 and the cover plates 3, a sealing surface die 2 is sleeved on the polytetrafluoroethylene circular ring 4, and the sealing surface die 2 is arranged between the bent pipe steel member 1 and the cover plates 3 and is fastened through a fastener 8.
In this embodiment, as shown in fig. 1, the inclination angle of the tetrafluoro inclined tube 9 is determined according to the angle of the bent tube and the number of segments to be split, the length of the longest inclined edge of the tetrafluoro inclined tube 9 is not more than 8cm, the outer diameter of the tetrafluoro inclined tube 9 is smaller than the inner diameter of the bent tube steel member 1 by 1-2mm, the inner diameter of the tetrafluoro short tube 5 is the same as the inner diameter of the tetrafluoro inclined tube 9, the outer diameter of the tetrafluoro short tube 5 is the same as the outer diameter of the tetrafluoro inclined tube 9, and the length of the tetrafluoro short tube 5 is the same as the straight edge segment of the bent tube steel member 1 by not more than 100mm.
In this embodiment, as shown in fig. 1, the outer diameter of the tetrafluoro ring 4 is smaller than the inner diameter of the sealing surface die 2 by 1mm, the inner diameter of the tetrafluoro ring 4 is the same as the inner diameter of the tetrafluoro inclined tube 9, a round hole is formed in the center of the cover plate 3, the round hole on the cover plate 3 is communicated with the inner cavity of the bent pipe core rod 6 in a hollow bent round tube shape, the bent pipe steel member 1 is in a bent "i" type structure, and the sealing surface die 2 is arranged at two ends of the bent pipe steel member 1.
As shown in fig. 1, the molding process of the steel-lined polytetrafluoroethylene bent pipe provided by the embodiment comprises the following steps:
step 1: respectively pressing polytetrafluoroethylene powder into a polytetrafluoroethylene inclined tube 9, a polytetrafluoroethylene short tube 5 and a polytetrafluoroethylene ring 4 by using a molding press;
step 2: after the prefabricated bent pipe steel part 1 is cleaned, a bent pipe core rod 6 sleeved with a rubber sleeve 7 is arranged in the bent pipe steel part, the distance is adjusted, and sealing surfaces of the rubber sleeves 7 at two ends are pricked by rubber bands;
step 3: a plurality of tetrafluoro inclined pipes 9 are sequentially filled in the cavity between the rubber sleeve 7 and the prefabricated bent pipe steel part 1, after the positions are adjusted, tetrafluoro short pipes 5 are respectively filled in the two ends of the tetrafluoro inclined pipes 9 and are tightly pressed, and the part of the redundant exposed flange surface is flattened by a special tool;
step 4: the polytetrafluoroethylene ring 4 and the sealing surface die 2 are sequentially arranged at the two ends of the polytetrafluoroethylene short pipe 5 respectively, the rubber band is taken down, the sealing surface of the rubber sleeve 7 is tidied, the cover plate 3 is arranged, and the locking is realized through the fastener 8;
step 5: and (5) conveying the finished workpiece into an isostatic pressing bin for compression molding.
In this embodiment, as shown in fig. 1, the inclination angle of the tetrafluoro inclined tube 9 is determined according to the angle of the bent tube and the number of segments to be split, the length of the longest bevel edge of the tetrafluoro inclined tube 9 is not more than 8cm, the outer diameter of the tetrafluoro inclined tube 9 is smaller than the inner diameter of the bent tube steel member 1 by 1-2mm, the inner diameter of the tetrafluoro short tube 5 is the same as the inner diameter of the tetrafluoro inclined tube 9, the outer diameter of the tetrafluoro short tube 5 is the same as the outer diameter of the tetrafluoro inclined tube 9, the length of the tetrafluoro short tube 5 is the same as the length of the straight segment of the bent tube steel member 1 by not more than 100mm, the outer diameter of the tetrafluoro ring 4 is smaller than the inner diameter of the sealing surface die 2 by 1mm, and the inner diameter of the tetrafluoro ring 4 is the same as the inner diameter of the tetrafluoro inclined tube 9.
In this embodiment, as shown in fig. 1, polytetrafluoroethylene powder is pressed by a pressing machine into a tetrafluoro-inclined tube 9 as shown in fig. 2, a tetrafluoro-short tube 5 as shown in fig. 3, and a tetrafluoro-circular ring 4 as shown in fig. 4, respectively. The inclination angle of the tetrafluoro inclined tube 9 is determined according to the angle of the bent tube part and the number of sections to be split, but the length of the longest bevel edge is not more than 8cm, so that the subsequent filling operation is facilitated; wherein the outer diameter of the tetrafluoro inclined tube is smaller than the inner diameter of the bent tube steel member 1 by 1-2mm, and the inner diameter size is calculated and determined according to the inner diameter requirement of the finished bent tube after mould pressing and the secondary compression ratio. The inner diameter and the outer diameter of the tetrafluoro short tube 5 are the same as those of the tetrafluoro inclined tube 9, and the length of the short tube 5 is the same as that of the straight edge section of the bent tube steel piece 1, but the length of the short tube is not more than 100mm, and if the short tube is longer, the short tube is manufactured in sections. The outer diameter of the tetrafluoro ring 4 is slightly smaller than the inner diameter of the sealing surface die 2 by about 1mm, the inner diameter is the same as that of the tetrafluoro inclined tube 9, and the thickness is calculated and determined according to the sealing thickness and the machining allowance required by the finished product. The process is easy to automate during mass production.
In the embodiment, the prefabricated elbow steel piece is reasonably cleaned, then the elbow core rod 6 sleeved with the rubber sleeve 7 is internally arranged, the distance is adjusted, and the sealing surfaces of the rubber sleeves at the two ends are pricked by rubber bands.
In this embodiment, a plurality of tetrafluoro inclined tubes 9 are sequentially filled in the hollow cavity between the rubber sleeve 7 and the prefabricated bent tube steel piece 1, after the positions are adjusted, tetrafluoro short tubes 5 are respectively filled in the two ends and are pressed, and the part of the redundant exposed flange surface is flattened by a special tool.
In the embodiment, a tetrafluoro ring 4 and a sealing surface die 2 are sequentially arranged at two ends respectively, the rubber band is taken down, the sealing surface of the rubber sleeve is tidied, and then the upper cover plate 3 and the fastening piece 8 are arranged.
In this embodiment, the above-completed workpiece is then fed into an isostatic pressing bin for press forming, and the following processes are all conventional processes. And will not be described.
In this embodiment, the steel lined polytetrafluoroethylene bent pipe and the molding process thereof provided in this embodiment are focused on:
a. the compaction pressure of the tetrafluoro inclined tube 9, the tetrafluoro short tube 5 and the tetrafluoro ring 4 is not easy to be controlled too high, if too high, the tetrafluoro components are not easy to be reconnected together in the isostatic pressing process, and if too low, the formed components are too loose to be assembled easily. The practical application proves that the pressure of the catalyst is superior at 0.5-1.0 MPa.
b. The sectional calculation of the inclined tube is the same as the manufacturing calculation of the shrimp bend.
In this embodiment, the manufacturing processes of the tetrafluoro inclined tube 9, the tetrafluoro short tube 5 and the tetrafluoro ring 4 can be automated or semi-automated, so that the working efficiency is greatly improved.
In this embodiment, the polytetrafluoroethylene bent pipe with steel lining provided in this embodiment is produced in a standard component manufacturing mode by using the polytetrafluoroethylene inclined pipe 9, the polytetrafluoroethylene short pipe 5 and the polytetrafluoroethylene ring 4, the thickness is determined after calculation according to the lining thickness requirement, the wall thickness is controlled, the wall thickness of each part of the finished product is relatively uniform, the material consumption of the workpieces with the same specification and the same size is consistent, and the refined cost control is easy.
In the embodiment, the steel lining polytetrafluoroethylene bent pipe provided by the embodiment replaces a mode of directly filling powder by a mode of filling each polytetrafluoroethylene standard part once by the lining, and the parts are basically gapless, so that the phenomenon that the powder is bridged and empty is scrapped is avoided.
In this embodiment, the manufacturing of the sealing surface of the steel-lined polytetrafluoroethylene bent pipe provided by this embodiment has replaced the mode of directly filling the polytetrafluoroethylene powder by directly putting the polytetrafluoroethylene ring 4, the thickness of each part of the polytetrafluoroethylene ring after pressing is uniform, the uneven condition of the sealing surface of the finished product pressed in the subsequent working procedure is avoided, meanwhile, the preformed thickness of the sealing surface can be well controlled, the finish machining amount is reduced, meanwhile, the material consumption can be accurately controlled, and the powder loss is greatly reduced.
In this embodiment, the steel lined polytetrafluoroethylene bent pipe provided in this embodiment is manufactured by pre-processing the inclined pipe 9, the tetrafluoro short pipe 5 and the tetrafluoro ring 4 in a low pressure state, so that the volume compression ratio is greatly reduced, the core rod can be thickened when the internal core rod is manufactured, and the gas exhausted from the interior of the fluorine material is greatly reduced in the isostatic pressing process of the post-process, thereby avoiding the condition that the rubber sleeve is easy to damage and improving the product forming rate.
The above description is merely a further embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art will be able to apply equivalents and modifications according to the technical solution and the concept of the present invention within the scope of the present invention disclosed in the present invention.
Claims (3)
1. The molding process of the steel lined polytetrafluoroethylene bent pipe is characterized by comprising the following steps of:
step 1: respectively pressing polytetrafluoroethylene powder into a polytetrafluoroethylene inclined tube (9), a polytetrafluoroethylene short tube (5) and a polytetrafluoroethylene ring (4) by using a molding press;
step 2: after the prefabricated bent pipe steel piece (1) is cleaned, a bent pipe core rod (6) sleeved with a rubber sleeve (7) is arranged in the bent pipe steel piece, the distance is adjusted, and sealing surfaces of the rubber sleeves (7) at two ends are pricked by rubber bands;
step 3: a plurality of tetrafluoro inclined pipes (9) are sequentially filled in a cavity between the rubber sleeve (7) and the prefabricated bent pipe steel piece (1), after the positions are adjusted, tetrafluoro short pipes (5) are respectively filled in the two ends of the tetrafluoro inclined pipes (9) and are pressed, and the part of the redundant exposed flange surface is flattened by a special tool;
step 4: the polytetrafluoroethylene circular rings (4) and the sealing surface dies (2) are sequentially arranged at the two ends of the polytetrafluoroethylene short pipe (5), after the rubber band is taken down and the sealing surface of the rubber sleeve (7) is finished, the cover plate (3) is arranged, and the cover plate is locked through the fastener (8);
step 5: and (5) conveying the finished workpiece into an isostatic pressing bin for compression molding.
2. A molding process of a steel lined polytetrafluoroethylene bent pipe as claimed in claim 1, wherein the inclination angle of the polytetrafluoroethylene bent pipe (9) is determined according to the angle of the bent pipe and the number of sections to be split, the length of the longest oblique side of the polytetrafluoroethylene bent pipe (9) is not more than 8cm, and the outer diameter of the polytetrafluoroethylene bent pipe (9) is 1-2mm smaller than the inner diameter of the bent pipe steel member (1).
3. A molding process of a steel lined polytetrafluoroethylene bent pipe as claimed in claim 1, wherein the inner diameter of the polytetrafluoroethylene short pipe (5) is the same as the inner diameter of the polytetrafluoroethylene inclined pipe (9), the outer diameter of the polytetrafluoroethylene short pipe (5) is the same as the outer diameter of the polytetrafluoroethylene inclined pipe (9), the length of the polytetrafluoroethylene short pipe (5) is the same as the straight edge section of the bent pipe steel member (1) and is not more than 100mm, the outer diameter of the polytetrafluoroethylene ring (4) is smaller than the inner diameter of the sealing surface mold (2) by 1mm, and the inner diameter of the polytetrafluoroethylene ring (4) is the same as the inner diameter of the polytetrafluoroethylene inclined pipe (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810742356.0A CN108644515B (en) | 2018-07-09 | 2018-07-09 | Steel lining polytetrafluoroethylene bent pipe and mould pressing process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810742356.0A CN108644515B (en) | 2018-07-09 | 2018-07-09 | Steel lining polytetrafluoroethylene bent pipe and mould pressing process thereof |
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| Publication Number | Publication Date |
|---|---|
| CN108644515A CN108644515A (en) | 2018-10-12 |
| CN108644515B true CN108644515B (en) | 2023-08-04 |
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| CN201810742356.0A Active CN108644515B (en) | 2018-07-09 | 2018-07-09 | Steel lining polytetrafluoroethylene bent pipe and mould pressing process thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108644515A (en) | 2018-10-12 |
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