The shape shown in Figure 3. Which is larger than the bore size should be appropriate to the size of the enhancement layer, or can not load, or even cause an enhancement layer completely loose head phenomenon. Clearance is generally 1 ~ 1.5mm.hydraulic pipe crimping machine Coat the inside of the trough will directly affect the quality of the joint. Currently there are no straight holes trough, and an annular trough and jagged sawtooth grooves combined. Cotton (fiber) due to the use of low pressure braided hose, pull-out force is small, have adopted no trough structure. Steel braided hose when withholding its enhancement layer is easy to produce bending, multi-use serrated. Steel Pipe layers are generally more unilateral enhancement layer thickness up to 3.6mm, while withholding make enhancement layer is formed into the trench wavy deformation of the ring and must be used in combination with zig-zag grooves, the grooves sawtooth-shaped groove width than two-thirds of its anti-pull-off force stronger.
