WO2019109282A1 - 钢衬聚四氟乙烯耐温垫加工方法及产品 - Google Patents
钢衬聚四氟乙烯耐温垫加工方法及产品 Download PDFInfo
- 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
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- WO
- WIPO (PCT)
- Prior art keywords
- steel
- workpiece
- temperature
- steel lining
- polytetrafluoroethylene
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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.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gasket Seals (AREA)
Abstract
Description
Claims (7)
- 一种钢衬聚四氟乙烯耐温垫加工方法,其特征在于包括如下步骤:1)定位及初加工:将聚四氟乙烯棒状或管状工件夹持在车床的卡盘上;先将工件端面车平、外表面车圆、加工中心孔至设计尺寸;2)换切断刀:切断刀的宽度不大于环形槽的设计宽度,装夹切断刀时,在刀座上同时夹持一块限位件,限位件朝向工件端面的一侧为平面,限位件与切断刀之间的间隙为垫片一侧边缘的厚度,限位件的前端超出切断刀刀尖前端;3)加工环形槽:移动车床刀座将限位件贴靠在工件的端面上,然后进刀,在工件上加工出一圈环形槽,环形槽的槽深小于设计槽深0.5~2mm;4)扩宽环形槽:退刀后,换切断刀加工或卸下限位件,再次进刀加工,向车床卡盘方向扩宽环形槽,使槽宽等于环形槽设计宽度,然后水平走刀,将环形槽底部加工平整,使得槽底直径达到设计尺寸;5)切断:在让出垫片另一侧边缘设计厚度的位置将工件切断,得到断面呈工字型的聚四氟乙烯骨架;6)装入钢衬和非石棉垫:将聚四氟乙烯骨架加温至200~230℃,使其软化后在环形槽中装入环形的钢衬,同时在钢衬与聚四氟乙烯骨架的两侧边缘之间装入环形的非石棉垫;7)形变复原:热态下,将聚四氟乙烯骨架两侧夹持在两块平板之间,然后缓慢降至室温后,取出即得成型工件,降温时间20~180分钟。
- 根据权利要求1所述的一种钢衬聚四氟乙烯耐温垫加工方法,其特征在于所述钢衬在圆周方向上呈波浪形。
- 根据权利要求1或2所述的一种钢衬聚四氟乙烯耐温垫加工方法,其特征在于所述限位件由聚四氟乙烯材料制成。
- 根据权利要求1或2所述的一种钢衬聚四氟乙烯耐温垫加工方法,其特征在于步骤1)和2)之间,在车床尾座上加顶针顶住工件中心。
- 根据权利要求4所述的一种钢衬聚四氟乙烯耐温垫加工方法,其特征在于针对聚四氟乙烯棒状工件,顶针直接顶在中心孔内底部。
- 根据权利要求4所述的一种钢衬聚四氟乙烯耐温垫加工方法,其特征在于中心孔的孔口位置设有阶梯形的顶块,顶块的小径段直径与中心孔等径并配合***中心孔中,顶块的大径段的一侧端面贴靠在工件端面上,顶针顶在大径段的另一侧端面中心。
- 一种钢衬聚四氟乙烯耐温垫产品,其特征在于按照权利要求1-6任意种方法生产。
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Citations (10)
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JPS57192670A (en) * | 1981-05-20 | 1982-11-26 | Nippon Pillar Packing Co Ltd | Gasket |
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US20060181032A1 (en) * | 2005-02-11 | 2006-08-17 | Riggs Robert A | Hybrid gasket |
WO2008010081A2 (en) * | 2006-03-02 | 2008-01-24 | Virginia Sealing Products, Inc. | Seamless corrugated insert gasket and method of forming the same |
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 |
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2017
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Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
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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 (en) * | 2006-03-02 | 2008-01-24 | Virginia Sealing Products, Inc. | Seamless corrugated insert gasket and method of forming the same |
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 |
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