The upper die is the upper half of the whole pair of dies, that is, the part of the die installed on the press slider. The upper die seat is a plate-like part on the upper die *, and the workpiece is pressed against the press slide and fixed by the die handle or directly with the press slide. The lower die is the lower half of the whole pair of dies, that is, the die part installed on the press table surface. The lower die seat is a plate-like part on the bottom surface of the lower die, which is directly fixed on the working table or the backing plate of the press when working. The edge wall is the side wall of the cutting edge of the punching die hole. The edge slope is the slope of each side of the edge wall of the punching die. Air cushion is an ejector powered by compressed air. See ejector. The anti-side press block is a part that supports a unidirectional force punch on the other side of the working face. So why does the bend wrinkle?

According to the different material properties of the pipe, it is necessary to face the weld seam on the line groove above the quasi-cored mandrel, and the weld seam is inside the arc. The bending arm speed and auxiliary pushing speed can be properly adjusted to make it balanced and even. When bending the thinner pipe, the inner pipe wall in the process of compression deformation, due to the metal structure is not stable enough, in addition to thickening, but also wrinkle deformation, the thinner the pipe wall, the worse the structural stability, the easier it is to wrinkle deformation.

There is also a frequently encountered situation, in the production and processing, often need to replace the mold. When installing a new mold, we may not carefully inspect and debug, the general wrinkling common problem phenomenon is: the clamping touch above the bending arm is not in place, the pipe will back up when bending the pipe, resulting in pipe wrinkling. Just turn the adjusting nut behind the clamp down. Shrink pipe machine is widely used in pipe fitting, automotive oil pipe, air pipe, water pipe, air conditioning pipe and other connection parts processing and forming, is the ideal pipe end forming processing equipment, processing shapes include: convex, concave joint, long flat, square, extension oblique, V shape, open elbow, flat elbow and other products manufactured into molding mold.

The pipe shrink machine is a hydraulic automatic pipe end processing machine controlled by the integrated control touch display screen to expand and shrink the pipe end under normal conditions. By replacing the mold, the pipe can be expanded, shrunk, bulging, upsetting bar and other pipe end processing. According to the user's needs, the manual, point or automatic machining type machine tool is freely decided by the fuel tank, bed, slide block, master cylinder, die core rod (optional), limiting cylinder, pressing cylinder, clamping die and axial positioning cylinder, axial positioning Angle iron and other main parts.

The tube shrink is a forming process to reduce the diameter of the end of the tube blank. The tube blank enters the deformation zone under the action of axial force, produces tangential shrinkage plastic deformation in the deformation zone, and then enters the stability zone, and finally forms a reduced end diameter.

Tube flaring is a forming process that enlarges the diameter of the end of the tube billet. The flaring shape can be conical or cylindrical. The tube billet enters the deformation zone under the action of axial force, and the plastic deformation of the flaring is generated in the deformation zone, and then enters the stable deformation zone.

The working speed of the main cylinder can be adjusted by setting a tubular throttle valve on the main cylinder circuit. The stack type hydraulic control check valve is set on the circuit of the pressing cylinder, so as to ensure that the mold is not loose during the clamping process; The displacement cylinder, the limit cylinder and the axial positioning cylinder are all provided with a superimposed bidirectional throttle valve, which can adjust the bidirectional movement speed of the above cylinder. The shift cylinder and the limit cylinder are used together with the conversion station, so that the station conversion is convenient and efficient, and the processing quality of pipe fittings is ensured.

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