六角法蘭面自鎖螺母鎖緊組件的使用方法

　　六角法蘭面螺母大多用在管道連接或者需要增加螺母接觸面的工件上，六角法蘭面螺母包括內部設有螺紋通孔的截面呈正六角形的螺母本體，螺母本體的一端設有法蘭面，它和普通六角螺母的尺寸與螺紋規格基本相同，不同之處在于，它是墊圈即法蘭面和螺母是一體式的，而且在法蘭面上設置有防滑的齒紋，從而增大了螺母與工件的接觸表面積，相比普通螺母加墊圈的組合，其拉力更大、更加牢固。

　　一般常見的六角法蘭面螺母規格大致都在M20以下，因為大部分六角法蘭面螺母都是用在管道及法蘭盤上，所以受工件約束，其規格同普通螺母相比要少一些。由于六角法蘭面螺母的結構特點，因此在與螺栓配合使用時，為了達到良好的自鎖效果、防止松動，必須通過擠壓六角面的形式即設置收口結構使螺紋孔產生變形。

　　現階段規格不大于M6的六角法蘭面螺母收口采用兩點壓扁，規格大于M8必須采用三點擠壓形式，在壓扁收口的過程中，需要設計復雜的收口工裝，且變形時內螺紋很容易產生裂紋，這將大大影響螺母的使用性能。

　　同時，產品大批量生產時容易漏收口，所以必須進行100%目視挑揀否則極易造成機械事故。另外在收口后，螺母在安裝擰入過程中與螺栓產生很大的摩擦力，會造成鍍層脫落，在機匣中形成多余物，造成污染。

　　六角法蘭面螺母主要包括螺母體,在螺母體的一端固定有法蘭面,在螺母體的另一端固定有蓋帽;由于在螺母體上設置了蓋帽,因而在使用六角法蘭面螺母時具有較好的密封性,可以有效地阻止雨水、潮氣、粉塵等有害物質浸入到螺母體中,防止螺母體發生銹蝕現象,從而可以大大延長六角法蘭面螺母使用壽命。

　　六角法蘭螺母材質:A3低碳鋼 35K高速鋼線材 45#鋼 40CR 35Crmoa;

　　六角法蘭螺母硬度等級: 4級5級6級8級10級12級;

　　六角法蘭螺母表面處理:一般分為鍍彩鋅和鍍白鋅兩種,且一般為冷電鍍鋅;

　　六角法蘭螺母主要規格:M5 M6 M8 M10 M12 M16 M20 (M20以上規格和M14 M18的法蘭螺母多不常用);

　　六角法蘭螺母螺紋規格:參照國標螺母螺紋;

　　六角法蘭螺母國標代號:GB6177-2000;

　　六角法蘭螺母使用特性:

　　1、配管:用管割刀或砂輪切割機,(切割片應專用)按所需長度垂直切割不銹鋼管,修凈端頭毛刺,整圓;

　　2、焊接:左右兩錐形凸緣法蘭片(帶凹槽,專供雙側帶凸緣密封墊嵌入用)分別與需要連接的兩配管端口,用鎢極氬弧焊(TIG焊)焊接;

　　3、襯墊:左右兩法蘭片間襯雙側凸緣密封墊;

　　4、緊固:用卡箍夾住兩法蘭片,后用緊固螺釘(內六角螺栓)卡箍法蘭或緊固手柄(外螺紋一端與手柄內螺紋連接,一端穿固定鉚釘活絡連接)。

　　六角法蘭螺母的檢驗難點:牙缺陷、六角對邊對角、尺寸。

　　第一站點45度側影像:檢測有無內牙;

　　第二站點側影像:檢測螺母總高度、法蘭高度;

　　第三站點上影像:檢測六角對邊對角;

　　第四站點下影像:檢測內孔直徑、法蘭直徑。

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　　Use method of hexagon flange face self-locking nut locking assembly

　　Hexagon flange nuts are mostly used for pipe connection or work pieces that need to increase nut contact surface. Hexagon flange nuts include nut bodies with hexagonal cross-section and threaded through holes inside. One end of nut body is provided with flange surface. Its size and thread specification are basically the same as those of ordinary hexagon nuts. The difference is that it is a washer, i.e. the flange surface and nut are the same It is of body type, and the flange surface is provided with anti-skid tooth pattern, so as to increase the contact surface area of nut and workpiece. Compared with the combination of ordinary nut and washer, its tensile force is larger and stronger.

　　Generally, the specifications of hex flange nuts are generally below M20, because most hex flange nuts are used in pipes and flange plates, so they are limited by workpieces, and their specifications are less than those of ordinary nuts. Because of the structural characteristics of hexagon flange nut, in order to achieve good self-locking effect and prevent loosening when it is used together with bolt, the screw hole must be deformed by extruding the hexagon surface, i.e. setting the closing structure.

　　At present, the hexagon flange nut with the Specification no more than M6 is flattened at two points, and the nut with the specification greater than M8 must be extruded at three points. In the process of flattening and necking, complex necking tooling needs to be designed, and the internal thread is easy to crack when it is deformed, which will greatly affect the use performance of the nut.

　　At the same time, the products are easy to be missed in mass production, so it is necessary to carry out 100% visual sorting or it will easily cause mechanical accidents. In addition, there is a great friction between the nut and the bolt during the installation and screwing in process after the closing, which will cause the coating to fall off, form the surplus in the gearbox, and cause pollution.

　　The hexagon flange nut mainly includes the nut body. One end of the nut body is fixed with a flange face, and the other end of the nut body is fixed with a cap. Because the cap is set on the nut body, the hexagon flange nut has better sealing performance when it is used, which can effectively prevent rain, moisture, dust and other harmful substances from entering the nut body, and prevent the nut body from rusting, Thus, the service life of hexagon flange nut can be greatly extended.

　　Hexagon flange nut material: A3 low carbon steel 35K high speed steel wire 45 × steel 40Cr 35CrMoA;

　　Hardness grade of hexagon flange nut: Grade 4, grade 5, grade 6, Grade 8, grade 10, grade 12;

　　Hexagon flange nut surface treatment: generally divided into color zinc plating and white zinc plating, and generally cold galvanizing;

　　Main specifications of hexagon flange nut: M5 M6 M8 M10 M12 M16 M20 (flange nuts with specifications above M20 and M14 M18 are not commonly used);

　　Hexagon flange nut thread specification: refer to national standard nut thread;

　　Hexagon flange nut National Standard Code: gb6177-2000;

　　Service characteristics of hex flange nut:

　　1. Piping: use pipe cutter or grinding wheel cutter (special for cutting blade) to cut stainless steel pipe vertically according to the required length, deburring the end and rounding;

　　2. Welding: the left and right tapered flange plates (with grooves, specially used for embedding the flange gasket on both sides) are welded with the two pipe ends to be connected respectively by TIG welding;

　　3. Gasket: two side flange gasket is lined between left and right flange pieces;

　　4. Fastening: clamp two flange plates with clamps, and then clamp the flange or fastening handle with fastening screws (hexagon socket bolts) (one end of the external thread is connected with the internal thread of the handle, and the other end is connected with fixed rivets).

　　Inspection difficulties of hexagon flange nut: tooth defect, hexagon opposite corner, dimension.

　　45 degree side image of the first site: check whether there is internal tooth;

　　Second station side image: detect the total height of nut and flange;

　　Image on the third site: detect the opposite corner of hexagon;

　　Image under the fourth station: check the diameter of inner hole and flange.