WO2019109282A1 - Procédé de traitement d'un joint résistant à la température de polytétrafluoroéthylène doté d'un revêtement en acier, et produit - Google Patents

Procédé de traitement d'un joint résistant à la température de polytétrafluoroéthylène doté d'un revêtement en acier, et produit Download PDF

Info

Publication number
WO2019109282A1
WO2019109282A1 PCT/CN2017/114910 CN2017114910W WO2019109282A1 WO 2019109282 A1 WO2019109282 A1 WO 2019109282A1 CN 2017114910 W CN2017114910 W CN 2017114910W WO 2019109282 A1 WO2019109282 A1 WO 2019109282A1
Authority
WO
WIPO (PCT)
Prior art keywords
steel
workpiece
temperature
steel lining
polytetrafluoroethylene
Prior art date
Application number
PCT/CN2017/114910
Other languages
English (en)
Chinese (zh)
Inventor
徐文胜
Original Assignee
徐文胜
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 徐文胜 filed Critical 徐文胜
Priority to PCT/CN2017/114910 priority Critical patent/WO2019109282A1/fr
Publication of WO2019109282A1 publication Critical patent/WO2019109282A1/fr

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B1/00—Methods for turning or working essentially requiring the use of turning-machines; Use of auxiliary equipment in connection with such methods
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/12—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering

Definitions

  • the invention relates to a gasket, in particular to a high temperature and high pressure resistant polytetrafluoroethylene gasket.
  • a ceramic reactor In the chemical production, a ceramic reactor is often used, and a ceramic layer is sintered on the inner wall of the reactor, so that the ceramic reactor has good corrosion resistance, the kettle mouth of the reaction kettle, the manhole and its external pipeline, etc.
  • the interface position needs to achieve a good seal. Therefore, it is necessary to use a material with anti-corrosion, high temperature and pressure resistance as a sealing member.
  • the seal member also needs a certain protection function to avoid ceramic damage or falling off at the interface position.
  • a gasket made of a polytetrafluoroethylene (PTFE) material is used as a sealing member, which has the advantages of high temperature resistance, low temperature resistance, corrosion resistance, non-adhesion, and no toxicity.
  • the working pressure of the PTFE material is relatively small, and the working pressure is usually -0.1 to 6.4 MPa; in order to adapt it to a larger working pressure, there is a method of providing a steel lining inside the gasket.
  • the molten polytetrafluoroethylene material is cast on the surface of the metal material by a hot melt method, so that the PTFE material is wrapped around the steel lining, thereby obtaining the final product, and the steel lining has a reinforcing effect, so that the pressure resistance of the gasket is better.
  • the Teflon layer can't be made too thick, otherwise it can't withstand the big work pressure.
  • Such a steel-lined gasket has several problems that are difficult to overcome:
  • the thickness of the PTFE layer on the surface of the gasket is difficult to control.
  • the gasket In the hot melt process, the gasket is flattened in the hot state, and it is necessary to provide a reference plane having a relatively high flatness. Even so, in the pressure In the flat process, it is also difficult to ensure that the steel lining can be accurately located at the center of a very thin PTFE.
  • the fluidized PTFE will promote the deformation and displacement of the steel lining, and the PTFE will also flow due to its own flow. Sexuality leads to localized unevenness, which ultimately results in a lower yield of the gasket.
  • PTFE has outstanding non-tackiness. Although it is fused to the surface of the steel lining, it does not actually form a good bond with the steel lining.
  • the linear expansion coefficient of PTFE is 10 to 20 times that of steel. When heated, Under the dual influence of extrusion and expansion, it is easy to tear the Teflon layer.
  • the object of the present invention is to provide a steel-lined polytetrafluoroethylene temperature-resistant mat and a processing method thereof, and the steel-lined polytetrafluoroethylene temperature-resistant mat obtained thereby has high processing yield and uniform thickness.
  • the object of the present invention is achieved by a method for processing a steel-lined polytetrafluoroethylene temperature resistant mat comprising the following steps:
  • the width of the cutting knife is not larger than the design width of the annular groove.
  • a limiting member is simultaneously clamped on the holder, and the side of the limiting member facing the end surface of the workpiece is a plane, and the limit is The gap between the piece and the cutting blade is the thickness of one edge of the spacer, and the front end of the limiting member exceeds the front end of the cutting blade tip;
  • the moving lathe tool holder abuts the limiting member against the end surface of the workpiece, and then feeds the blade to machine a ring groove on the workpiece, the groove depth of the annular groove is less than the design groove depth of 0.5 to 2 mm;
  • the workpiece is cut at a position where the thickness of the other side of the gasket is designed to obtain a teflon skeleton having an I-shaped cross section;
  • Loading steel lining and non-asbestos mat The PTFE skeleton is heated to 200-230 ° C, softened, and then an annular steel lining is placed in the annular groove, while the steel lining and the PTFE skeleton are A non-asbestos pad is placed between the two sides of the ring; the non-asbestos pad is made of non-asbestos material, and the non-asbestos material is an existing material in the prior art, which is composed of aramid fiber, inorganic fiber, synthetic rubber and the like. Minerals, which are calendered under high temperature and high pressure;
  • the invention is made into a steel-lined PTFE temperature-resistant pad by mechanical processing, and the dimensional precision is easy to control, and a gap is left between the steel lining and the non-asbestos pad, and the sealing is better after installation, and the injection molding process can be avoided.
  • the steel liner bias phenomenon occurs in the process, and its non-asbestos cushion is easy to install.
  • the device is suitable for the kettle mouth seal of the ceramic reactor, and it is durable and ensures a good sealing effect for a long time.
  • a further improvement is that the steel lining is wavy in the circumferential direction.
  • the undulating steel lining has good elasticity, which ensures the durability of the device and its long service life.
  • the limiting member is made of a polytetrafluoroethylene material.
  • the material is the same as the body material of the steel-lined PTFE temperature-resistant mat, and it is not easy to cause abrasion and surface scratch during processing.
  • a thimble is placed on the tailstock of the lathe against the center of the workpiece.
  • the thimble is directly placed on the bottom of the center hole.
  • a stepped top block may be disposed at the opening of the center hole, and the diameter of the small diameter section of the top block is matched with the diameter of the center hole and inserted into the center hole, and one end surface of the large diameter section of the top block abuts On the end face of the workpiece, the top of the thimble is at the center of the other end face of the large diameter section.
  • Figure 1 is a cross-sectional view showing a steel-lined polytetrafluoroethylene temperature resistant mat of the present invention.
  • FIG. 2 is a schematic view showing the structure of a steel-lined polytetrafluoroethylene temperature-resistant mat of the present invention.
  • Fig. 3 is a schematic view showing the clamping of the cutting blade and the limiting member during the processing.
  • Figure 4 is a working principle diagram of the cutting blade and the limiting member during the machining process.
  • Figure 5 is a working principle diagram of the ejector pin and the top block during the machining process.
  • 1 steel lining 1 non-asbestos mats, 3 skeletons, 4 center holes, 5 chucks, 6 workpieces, 7 annular grooves, 8 thimbles, 9 limit pieces, 10 cutting knives, 11 knives, 12 top blocks.
  • Fig. 1 and 2 it is a steel-lined PTFE temperature-resistant mat.
  • Its structure mainly includes steel lining 1, non-asbestos mat 2 and skeleton 3.
  • the center of the skeleton 3 is provided with a central hole 4, and the material of the skeleton 3 is gathered.
  • the circumferential surface of the skeleton 3 is provided with an annular groove 7, the steel lining 1 is installed in the annular groove 7, and two non-asbestos pads 2 are respectively installed on both sides of the steel lining 1, steel lining 1, non-asbestos pad There is a gap between the two, the non-asbestos pad 2 is made of non-asbestos material, and the non-asbestos material is an existing material in the prior art, which is composed of inorganic minerals such as aramid fiber, inorganic fiber and synthetic rubber at high temperature and high pressure.
  • the steel liner 1 is wavy in the circumferential direction.
  • the moving lathe seat 11 abuts the limiting member against the end surface of the workpiece 6, and then feeds the tool to machine a ring groove 7 on the workpiece 6, the groove depth of the annular groove 7 is smaller than the design groove depth 0.5 to 2 mm;
  • the workpiece 6 is cut at a position where the thickness of the other side edge of the gasket is designed to obtain a teflon skeleton 3 having an I-shaped cross section;
  • the difference from the first embodiment is that the workpiece is processed by using a Teflon tubular workpiece 6.
  • the center hole 4 needs to be processed to the design size, otherwise the center hole and the polytetrafluoroethylene are processed.
  • the concentricity of the outer circumference of the ethylene tubular workpiece is difficult to ensure. Therefore, the diameter of the central through hole of the tubular workpiece should be smaller than the diameter of the central hole of the finished product.
  • a stepped top block is provided at the opening of the central hole 4.
  • the diameter of the small diameter section of the top block 12 and the equal diameter of the center hole are inserted into the center hole, and one end surface of the large diameter section of the top block 12 abuts against the end surface of the workpiece, and the ejector pin 8 is placed on the other side of the large diameter section. End center.
  • the skeleton 3 was heated to 230 ° C, and when the deformation was restored, the slow cooling time was 180 minutes.
  • the invention adopts a machined form to manufacture a steel-lined PTFE temperature-resistant mat, which can avoid problems caused by casting, injection molding, etc., and ensures dimensional accuracy and reliability.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gasket Seals (AREA)

Abstract

L'invention concerne un joint résistant à la température de polytétrafluoroéthylène doté d'un revêtement en acier et son procédé de traitement, se rapportant au domaine technique des joints résistant aux températures élevées, et comprenant : l'obtention, au moyen d'un usinage, d'une structure en polytétrafluoroéthylène (3) possédant une section en forme de I; puis le chauffage de la structure en polytétrafluoroéthylène (3) à 200 à 230 °C en vue de ramollir cette dernière, le montage d'un revêtement en acier annulaire (1) dans une rainure annulaire (7) et le montage simultané d'un amortissement sans amiante annulaire (2) entre deux bords latéraux du revêtement en acier (1) et de la structure de polytétrafluoroéthylène (3); et enfin, dans un état chaud, la prise en sandwich de deux côtés de la structure en polytétrafluoroéthylène (3) entre deux plaques plates, puis, après refroidissement lent à température ambiante, le retrait d'une pièce restaurée et moulée. Lors de la fabrication du joint résistant à la température, la précision dimensionnelle est facile à commander; un espace est réservé entre le revêtement en acier et le joint sans amiante, de sorte qu'une meilleure efficacité d'étanchéité soit obtenue après le montage; le décalage du revêtement en acier dans un processus de moulage par injection peut être empêché; en outre, une couche d'amortissement sans amiante du joint résistant à la température est facile à monter. Le dispositif peut être appliqué pour étanchéifier l'embouchure d'une bouilloire de réaction en céramique et est durable de sorte qu'un effet d'étanchéité satisfaisant et à long terme soit assuré.
PCT/CN2017/114910 2017-12-07 2017-12-07 Procédé de traitement d'un joint résistant à la température de polytétrafluoroéthylène doté d'un revêtement en acier, et produit WO2019109282A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2017/114910 WO2019109282A1 (fr) 2017-12-07 2017-12-07 Procédé de traitement d'un joint résistant à la température de polytétrafluoroéthylène doté d'un revêtement en acier, et produit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2017/114910 WO2019109282A1 (fr) 2017-12-07 2017-12-07 Procédé de traitement d'un joint résistant à la température de polytétrafluoroéthylène doté d'un revêtement en acier, et produit

Publications (1)

Publication Number Publication Date
WO2019109282A1 true WO2019109282A1 (fr) 2019-06-13

Family

ID=66750353

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2017/114910 WO2019109282A1 (fr) 2017-12-07 2017-12-07 Procédé de traitement d'un joint résistant à la température de polytétrafluoroéthylène doté d'un revêtement en acier, et produit

Country Status (1)

Country Link
WO (1) WO2019109282A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57192670A (en) * 1981-05-20 1982-11-26 Nippon Pillar Packing Co Ltd Gasket
GB2229047A (en) * 1989-01-31 1990-09-12 Chemical Reactor Services Ltd Conducive PTFE/graphite gasket
US20060181032A1 (en) * 2005-02-11 2006-08-17 Riggs Robert A Hybrid gasket
WO2008010081A2 (fr) * 2006-03-02 2008-01-24 Virginia Sealing Products, Inc. Garniture à pièce rapportée ondulée sans soudure et procédé de réalisation de celle-ci
CN101144541A (zh) * 2007-09-30 2008-03-19 马志刚 波形自紧式复合密封垫片
CN102069195A (zh) * 2010-12-21 2011-05-25 沈阳黎明航空发动机(集团)有限责任公司 一种环状平行度面聚四氟乙烯橡胶圈的车加工方法
CN201884635U (zh) * 2010-09-20 2011-06-29 邢德君 金属包覆垫片
CN103447833A (zh) * 2013-08-12 2013-12-18 重庆江增船舶重工有限公司 Ptfe塑料转动套筒机械加工方法
CN203516720U (zh) * 2013-05-21 2014-04-02 镇江春环密封件集团有限公司 一种密封用垫片
CN104923806A (zh) * 2015-06-16 2015-09-23 湖北三江航天江北机械工程有限公司 薄壁聚四氟乙烯密封环加工方法

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57192670A (en) * 1981-05-20 1982-11-26 Nippon Pillar Packing Co Ltd Gasket
GB2229047A (en) * 1989-01-31 1990-09-12 Chemical Reactor Services Ltd Conducive PTFE/graphite gasket
US20060181032A1 (en) * 2005-02-11 2006-08-17 Riggs Robert A Hybrid gasket
WO2008010081A2 (fr) * 2006-03-02 2008-01-24 Virginia Sealing Products, Inc. Garniture à pièce rapportée ondulée sans soudure et procédé de réalisation de celle-ci
CN101144541A (zh) * 2007-09-30 2008-03-19 马志刚 波形自紧式复合密封垫片
CN201884635U (zh) * 2010-09-20 2011-06-29 邢德君 金属包覆垫片
CN102069195A (zh) * 2010-12-21 2011-05-25 沈阳黎明航空发动机(集团)有限责任公司 一种环状平行度面聚四氟乙烯橡胶圈的车加工方法
CN203516720U (zh) * 2013-05-21 2014-04-02 镇江春环密封件集团有限公司 一种密封用垫片
CN103447833A (zh) * 2013-08-12 2013-12-18 重庆江增船舶重工有限公司 Ptfe塑料转动套筒机械加工方法
CN104923806A (zh) * 2015-06-16 2015-09-23 湖北三江航天江北机械工程有限公司 薄壁聚四氟乙烯密封环加工方法

Similar Documents

Publication Publication Date Title
CN103551856B (zh) 防止高精度大型钛合金薄壁铸件安装边变形的加工方法
CN109622990A (zh) 控制超薄壁铝合金高精度管嘴密封槽车削变形方法及夹具
CN105478851A (zh) 一种深孔加工专用刀具及其加工方法
WO2019109282A1 (fr) Procédé de traitement d'un joint résistant à la température de polytétrafluoroéthylène doté d'un revêtement en acier, et produit
CN112705577A (zh) 一种球阀阀体阀管一次性成形方法
CN203831102U (zh) 一种薄壁管件的夹具
CN108440879B (zh) 高温增压聚四氟乙烯复合材料及其产品制造工艺及环垫
CN110815688A (zh) 管板加工模具及工艺
CN104646976B (zh) 飞机用复合材料薄壳模具型面快速制造方法
KR101576645B1 (ko) 핫스템핑 금형의 제작방법 및 이 제작방법으로 제작된 핫스템핑 금형
CN104588890B (zh) 一种用于薄壁环形工件外表面堆焊的夹具
CN209886681U (zh) 3d打印设备腔体金属粉末密封结构
CN106583755A (zh) 一种ω环密封垫圈的加工方法
CN108237695B (zh) 一种改进型pe管热熔对接机和用其制备止水环的方法
CN113752094A (zh) 一种半导体绝缘环加工方法
CN108581372B (zh) 薄型钢板开槽加工工艺
CN100348364C (zh) 异型多通管件加工夹具及加工工艺
CN113414553A (zh) 核电站轴封主泵叶轮罩的加工工艺
CN109093329A (zh) 一种水泵泵头内流道嵌件的加工工艺
JP4965213B2 (ja) 変性ポリ四フッ化エチレン成形体の溶着方法
CN117140010B (zh) 一种防变形长寿命复合密封垫圈的制备方法
CN104985408A (zh) 一种制冷压缩机壳体加工工艺
CN104527057A (zh) 聚四氟乙烯密封圈加工方法及设备
CN216005626U (zh) 玻璃压型模具
CN110732838A (zh) 一种加工ω环密封垫圈的加工工艺

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17934333

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17934333

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 17934333

Country of ref document: EP

Kind code of ref document: A1

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC F1205A DATED 09.12.20

122 Ep: pct application non-entry in european phase

Ref document number: 17934333

Country of ref document: EP

Kind code of ref document: A1