CN111805932A - 耐高温高负压钢衬模压pfa板材及其制作筒体的制造方法 - Google Patents

耐高温高负压钢衬模压pfa板材及其制作筒体的制造方法 Download PDF

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CN111805932A
CN111805932A CN202010654874.4A CN202010654874A CN111805932A CN 111805932 A CN111805932 A CN 111805932A CN 202010654874 A CN202010654874 A CN 202010654874A CN 111805932 A CN111805932 A CN 111805932A
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pfa
plate
welding
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steel
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毛伟
毛沁
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Wuxi Weiye Chemical Anticorrosive Equipment Factory
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C69/00Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
    • B29C69/007Lining or sheathing in combination with forming the article to be lined
    • B29C69/008Lining or sheathing in combination with forming the article to be lined of tubular articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/18Compression 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
    • B29C43/183Compression 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/20Making multilayered or multicoloured articles
    • B29C43/203Making multilayered articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/36Bending and joining, e.g. for making hollow articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/10Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined
    • B29C65/12Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined and welding bar
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/52Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/82Testing the joint
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/82Testing the joint
    • B29C65/8207Testing the joint by mechanical methods
    • B29C65/8246Pressure tests, e.g. hydrostatic pressure tests
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/02Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/022Mechanical pre-treatments, e.g. reshaping
    • B29C66/0222Mechanical pre-treatments, e.g. reshaping without removal of material, e.g. cleaning by air blowing or using brushes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/02Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/022Mechanical pre-treatments, e.g. reshaping
    • B29C66/0224Mechanical pre-treatments, e.g. reshaping with removal of material
    • B29C66/02241Cutting, e.g. by using waterjets, or sawing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/18Compression 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
    • B29C2043/189Compression 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 parts being joined

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

本发明涉及防腐化工设备制造技术领域,公开了耐高温高负压钢衬模压PFA板材及其制作筒体的制造方法,PFA原材料通过在钢板上点焊钢网后直接模压在钢板上,与钢板为一体式结构;将模压后的钢板进行卷制成筒,对钢板外部进行焊接,内部需对拼接处PFA板的拼接处进行倒角后再进行焊接,使PFA板材的焊接更贴合不会出现漏点。在筒体的钢板法兰口处焊接法兰,将模压的PFA材料伸出一个法兰贴合面的高度,将超出法兰部分的PFA板材进行电加热,将套模具套在PFA材料进行翻边并和法兰贴合。本发明通过模压工艺将PFA材料模压在带钢网的钢板上,再进行筒体设备的制作,PFA板材与钢板之间无需使用胶水,可耐高温,高负压,提高筒体设备内壁的防腐性能,延长设备的使用寿命。

Description

耐高温高负压钢衬模压PFA板材及其制作筒体的制造方法
技术领域
本发明涉及防腐化工设备制造技术领域,具体涉及钢衬模压PFA板材及其制作筒体的制造方法。
背景技术
化工设备以及用于储存化工物料的容器大部分都需要具有抗腐蚀的功能。为提高金属的耐腐蚀性,常在化工设备的内壁表面衬覆耐腐蚀板片,这些板片先要安装贴合在设备内壁表面,然后采用抽真空的方法使板片贴合在设备内壁表面上,然后将板片焊接成一个整体。这种制造工艺的缺陷在于:板片形状与设备内壁表面存在偏差,由于板片一般具有较高的强度和刚性,因此采用抽真空的方法并不能使板片与设备内壁表面完全贴合,往往存在间隙,长期使用会出现板片与设备内壁表面起层脱离现象,碰到温度高的化学材料,粘合的胶水往往会不耐温度从而脱胶,导致板材脱落,或有真空工况,板材会鼓包脱落,从而降低化工设备的使用寿命。
发明内容
本发明解决的技术问题是提供一种将PFA材料模压在钢板上并制作成筒体的制造方法,模压后的PFA板材可以与钢板贴合性好,且不易鼓包脱落,可耐高温,高负压,防腐性能高。
本发明解决其技术问题所采用的技术方案是:耐高温高负压钢衬模压PFA板材的制造方法,包括以下步骤:
a.对制作所需的钢板进行钢网点焊,并保证钢板的清洁度;
b.将步骤a的钢板放入模压模具内,将模压模具精确的安装好;
c.将PFA模压粒子料平均铺入模压模具内,盖好模板;并将模压模具放入电加热炉内,加热至PFA模压粒子的熔融点;
d.PFA板材从电加热炉内取出,放至压机上进行模压成型;
e.将模压模具拆卸,PFA板材从模压模具内吊出。
进一步的是:所述步骤a和步骤b之间还需要对用钢砂对钢板表面进行喷砂,使钢板表面的粗糙度达到70微米。
进一步的是:所述步骤d还包括在PFA材料模压初定型后,对PFA板材进行保压,保证PFA板材的密度;待模压模具自然冷却后,对模具模压内注入冷却水,可以保证PFA板材的密度和光洁度。
进一步的是:所述步骤a中的点焊采用气保焊,可以保证清洁度。
进一步的是:所述步骤c中模压粒子料的平均厚度4-5微米,该厚度模压的PFA板材平整度和厚度更均匀。
耐高温高负压钢衬模压PFA板材制作筒体的制造方法,包括以下步骤:
a.对制作所需的钢板采用气保焊进行钢网点焊,并保证钢板的清洁度;对用钢砂对钢板表面进行喷砂,使钢板表面的粗糙度达到70微米;
b.将步骤a的钢板放入模压模具内,将模压模具精确的安装好;
c.将PFA模压粒子料平均铺入模压模具内,盖好模板;并将模压模具放入电加热炉内,加热至PFA模压粒子的熔融点;
d.PFA板材从电加热炉内取出,放至压机上进行模压成型;
e.将模压模具拆卸,PFA板材从模压模具内吊出;
f.根据筒体尺寸所需的模压PFA板材,将模压好的PFA板材在卷板机上进行卷制成筒体;
g.对卷制好的筒体进行拼接,对筒体的外连接缝隙采用气保焊进行焊接;
h.用V型刀具在筒体内的PFA板材的内连接处开切V型焊道,焊条焊接时可以更好的与PFA板材进行贴合;清理V型焊道,对筒体内PFA板材一次焊接;
i.采用自动焊接机对一次焊接形成的焊道上加覆焊条,形成扁形焊带,更好的加强板材之间的整合度。
进一步的是:还包括步骤j.将法兰焊接于钢板筒体上,在法兰压接面涂上胶水,将筒体中PFA板材露出部分用明火加热至半透明状,套上模具并卡紧定型,使PFA板材与法兰面完全贴合,增强了压接面的强度。
进一步的是:还包括密封性检测,将筒体密封,对其内部充气体,在筒体外部喷射水,气压与水压双重检测。
进一步的是:所述步骤h和i之间还需要利用强光对一次焊接后的焊道进行焊缝检漏,强光照射焊缝,若有气孔或漏点更易发现。
进一步的是:所述步骤d还包括在PFA材料模压初定型后,对PFA板材进行保压,保证PFA板材的密度;待模压模具自然冷却后,对模具模压内注入冷却水,可以保证PFA板材的密度和光洁度。
本发明的有益效果是:本发明将PFA原材料通过在钢板上点焊钢网后直接模压在钢板上,与钢板形成一体式结构;将模压后的钢板进行卷制成筒,对钢板外部进行焊接,内部需对拼接处PFA板的拼接处进行倒角后再进行焊接,使PFA板材的焊接更贴合不会出现漏点。在筒体的钢板法兰口处焊接法兰,将模压的PFA材料伸出一个法兰贴合面的高度,将超出法兰部分的PFA板材进行电加热,将套模具套在PFA材料进行翻边并和法兰贴合。本发明的筒体在遇到高温高真空工况时,能够保持与钢板贴合完好,不会鼓包脱落。本发明通过模压工艺将PFA材料模压在带钢网的钢板上,再进行筒体设备的制作,PFA板材与钢板之间无需使用胶水,可耐高温,高负压,提高了筒体设备内壁的防腐性能,延长了设备的使用寿命。
具体实施方式
下面结合具体实施方式对本发明进一步说明。
实施例:
耐高温高负压钢衬模压PFA板材的制造方法,包括以下步骤:
a.对制作所需的钢板进行钢网点焊,并保证钢板的清洁度;钢网点焊采用气保焊,保证钢板与PFA板材模压的接触面的清洁度,可以使模压出的PFA板材外观平整度上最优。
b.将步骤a的钢板放入模压模具内,将模压模具精确的安装好;在将钢板放入模压模具前,需要用钢砂对钢板表面进行喷砂,使钢板表面的粗糙度达到70微米,可以使PFA板材模压时誉钢板更好的融合。
c.将PFA模压粒子料平均铺入模压模具内,模压粒子料的平均厚度在4-5微米,4-5微米的厚度模压的PFA板材平整度和厚度更均匀;盖好模板后将模压模具放入电加热炉内,加热至PFA模压粒子的熔融点,PFA粒子在模压模具内流畅均匀。
d.PFA板材从电加热炉内取出,放至压机上进行模压成型;放至500吨的压机上进行模压成型,待PFA模压至所需的位置初定型,对PFA板材进行保压,以保证板材的密度;待模压模具自然冷却至常温后,对模压模具内注入冷却水再次进行冷却成型,保证PFA板材的密度和光洁度。
e.将模压模具拆卸,PFA板材从模压模具内吊出。即制得模压PFA板材。
本实施例中采用的PFA材料,也可以是F46(聚全氟乙丙烯)材料。
实施例:
耐高温高负压钢衬模压PFA板材制作筒体的制造方法,包括以下步骤:
a.对制作所需的钢板进行钢网点焊,并保证钢板的清洁度;钢网点焊采用气保焊,保证钢板与PFA板材模压的接触面的清洁度,可以使模压出的PFA板材外观平整度上最优。
b.将步骤a的钢板放入模压模具内,将模压模具精确的安装好;在将钢板放入模压模具前,需要用钢砂对钢板表面进行喷砂,使钢板表面的粗糙度达到70微米,可以使PFA板材模压时誉钢板更好的融合。
c.将PFA模压粒子料平均铺入模压模具内,模压粒子料的平均厚度在4-5微米,4-5微米的厚度模压的PFA板材平整度和厚度更均匀;盖好模板后将模压模具放入电加热炉内,加热至PFA模压粒子的熔融点,PFA粒子在模压模具内流畅均匀。
d.PFA板材从电加热炉内取出,放至压机上进行模压成型;放至500吨的压机上进行模压成型,待PFA模压至所需的位置初定型,对PFA板材进行保压,以保证板材的密度;待模压模具自然冷却至常温后,对模压模具内注入冷却水再次进行冷却成型,保证PFA板材的密度和光洁度。
e.将模压模具拆卸,PFA板材从模压模具内吊出。即制得模压PFA板材。
f.根据筒体尺寸所需的模压PFA板材,将模压好的PFA板材在卷板机上进行卷制成筒体;
g.为了对卷制好的筒体进行固定,需对卷制好的筒体进行拼接,并对筒体的外连接缝隙采用气保焊进行焊接;气保焊的焊缝更平整并且不会对钢板内的PFA板材造成损伤。
h.为了使焊条焊接时使PFA板材更好的贴合,焊接不产生漏点,用V型刀具在筒体内的PFA板材的内连接处开切V型焊道,V型焊道角度为20°-30°为佳;用清洁压缩空气冲吹清理V型焊道,确保焊道无杂物灰尘,对筒体内PFA板材一次焊接。
为了检测焊缝是否焊接完整,还需要利用强光对一次焊接后的焊道进行焊缝检漏,强光照射焊缝,若有气孔或漏点更易发现;若存在气孔或漏点需要进行补焊。
i.采用自动焊接机对一次焊接形成的焊道上加覆焊条,焊条采用扁焊条,形成扁形焊带,更好的加强板材之间的整合度,增强焊道的强度。
为保证PFA板材与钢板的贴合度及筒体的制作,还包括步骤j.将法兰焊接于钢板筒体上,在法兰压接面涂上胶水,将筒体中PFA板材露出部分用明火加热至半透明状,套上模具并卡紧定型,使PFA板材与法兰面完全贴合,使法兰面与PFA板材之间是完全一体,增强了压接面的强度。
为了保证筒体的密封性,还包括密封性检测,将筒体密封,对其内部充气体,在筒体外部喷射水,气压与水压双重检测。还包括绝缘性检测,用20000V的高压电火花进行绝缘检测。
为了保证筒体设备的清洁,需用清洗液对筒体设备进行整体清洗,用清水冲洗干净后进行干燥;并对筒体设备外表面进行打磨、喷砂及涂油漆,以符合客户要求进行交付使用。
本实施例中采用的PFA材料,也可以是F46(聚全氟乙丙烯)材料。
以上所述的具体实施例,对本发明的目的、技术方案和有益效果进行了进一步详细说明,所应理解的是,以上所述仅为本发明的具体实施例而已,并不用于限制本发明,凡在本发明的精神和原则之内,所做的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。

Claims (10)

1.耐高温高负压钢衬模压PFA板材的制造方法,其特征在于,包括以下步骤:
a.对制作所需的钢板进行钢网点焊,并保证钢板的清洁度;
b.将步骤a的钢板放入模压模具内,将模压模具精确的安装好;
c.将PFA模压粒子料平均铺入模压模具内,盖好模板;并将模压模具放入电加热炉内,加热至PFA模压粒子的熔融点;
d.PFA板材从电加热炉内取出,放至压机上进行模压成型;
e.将模压模具拆卸,PFA板材从模压模具内吊出。
2.如权利要求1所述的耐高温高负压钢衬模压PFA板材的制造方法,其特征在于:所述步骤a和步骤b之间还需要对用钢砂对钢板表面进行喷砂,使钢板表面的粗糙度达到70微米。
3.如权利要求1所述的耐高温高负压钢衬模压PFA板材的制造方法,其特征在于:所述步骤d还包括在PFA材料模压初定型后,对PFA板材进行保压,保证PFA板材的密度;待模压模具自然冷却后,对模具模压内注入冷却水,可以保证PFA板材的密度和光洁度。
4.如权利要求1或2所述的耐高温高负压钢衬模压PFA板材的制造方法,其特征在于:所述步骤a中的点焊采用气保焊,可以保证清洁度。
5.如权利要求4所述的耐高温高负压钢衬模压PFA板材的制造方法,其特征在于:所述步骤c中模压粒子料的平均厚度4-5微米,该厚度模压的PFA板材平整度和厚度更均匀。
6.耐高温高负压钢衬模压PFA板材制作筒体的制造方法,其特征在于,包括以下步骤:
a.对制作所需的钢板采用气保焊进行钢网点焊,并保证钢板的清洁度;对用钢砂对钢板表面进行喷砂,使钢板表面的粗糙度达到70微米;
b.将步骤a的钢板放入模压模具内,将模压模具精确的安装好;
c.将PFA模压粒子料平均铺入模压模具内,盖好模板;并将模压模具放入电加热炉内,加热至PFA模压粒子的熔融点;
d.PFA板材从电加热炉内取出,放至压机上进行模压成型;
e.将模压模具拆卸,PFA板材从模压模具内吊出;
f.根据筒体尺寸所需的模压PFA板材,将模压好的PFA板材在卷板机上进行卷制成筒体;
g.对卷制好的筒体进行拼接,对筒体的外连接缝隙采用气保焊进行焊接;
h.用V型刀具在筒体内的PFA板材的内连接处开切V型焊道,焊条焊接时可以更好的与PFA板材进行贴合;清理V型焊道,对筒体内PFA板材一次焊接;
i.采用自动焊接机对一次焊接形成的焊道上加覆焊条,形成扁形焊带,更好的加强板材之间的整合度。
7.如权利要求6所述的耐高温高负压钢衬模压PFA板材制作筒体的制造方法,其特征在于:还包括
步骤j.将法兰焊接于钢板筒体上,在法兰压接面涂上胶水,将筒体中PFA板材露出部分用明火加热至半透明状,套上模具并卡紧定型,使PFA板材与法兰面完全贴合,增强了压接面的强度。
8.如权利要求7所述的耐高温高负压钢衬模压PFA板材制作筒体的制造方法,其特征在于:还包括密封性检测,将筒体密封,对其内部充气体,在筒体外部喷射水,气压与水压双重检测。
9.如权利要求6所述的耐高温高负压钢衬模压PFA板材制作筒体的制造方法,其特征在于:所述步骤h和i之间还需要利用强光对一次焊接后的焊道进行焊缝检漏,强光照射焊缝,若有气孔或漏点更易发现。
10.如权利要求6所述的耐高温高负压钢衬模压PFA板材制作筒体的制造方法,其特征在于:所述步骤d还包括在PFA材料模压初定型后,对PFA板材进行保压,保证PFA板材的密度;待模压模具自然冷却后,对模具模压内注入冷却水,可以保证PFA板材的密度和光洁度。
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