Wave plate falling device of welded metal corrugated pipe

Abstract

The invention discloses a wave plate falling device of a welded metal corrugated pipe, which is mainly characterized in that a lower die assembly comprises a lower die base, a cutting die, an external pressure plate and an internal pressure plate. The upper end of the cutting die protrudes out of the top face of the lower die based and the top face of the cutting die is in a wave plate curve face. The external pressure plate is attached to the outer wall of the cutting die. The top face of the external pressure plate is aligned with the side face outside the cutting die and forms a first chamfered angle with the top end of the external pressure plate at the attached place of the cutting die. The internal pressure plate is placed in the cutting die, and the bottom face thereof leans against the lower die base through an elastic mandrill. The internal pressure plate is attached to the inner wall of the cutting die, and the to top face of the internal pressure plate is aligned with the highest point on the top face of the cutting die and forms a second chamfered angle with the top end of the internal pressure plate at the attached place of the cutting die. An upper die assembly comprises a rubber template fixed on the bottom face of the upper die base. The bottom face of the rubber template is planar. The rubber template flexibly squeezes, molds and cuts the wave plate, and the squeezing stress of the wave plate is small, so that the wave plate does not deform in case of stress recovery, and the molded wave plate is accurate in parameters and burr-free.

Description

technical field [0001] The invention relates to a wave plate blanking device for welding metal bellows. Background technique [0002] Welded metal bellows mechanical seals are widely used in petroleum, chemical, chemical fiber, pulp, pharmaceutical, thermoelectric and other industries, and can be used in any equipment with pumping or stirring. The core of the welded metal bellows mechanical seal device provides elastic compensation for the bellows, so it is particularly critical to manufacture bellows bellows. [0003] At present, most of the welded metal bellows seal suppliers or manufacturers can provide the shape of the annular wave plate. The inner and outer diameter edges are mostly radial straight edges, also known as the straight knife wave plate, but the bellows welded by the straight knife wave plate Poor stress and fatigue strength. If the inner diameter edge of the wave plate is designed with an inclination angle of 40°~47°, although this wave plate is beneficia...

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Problems solved by technology

[0003] At present, most of the welded metal bellows seal suppliers or manufacturers can provide the shape of the annular wave plate. The inner and outer diameter edges are mostly radial straight edges, also known as the straight knife wave plate, but the bellows welded by the straight knife wave plate Poor stress and fatigue strength

If the inner diameter edge of the wave plate is designed with an inclination angle of 40°~47°, although this wave plate is beneficial to the force of the bellows, it is extremely difficult to form the wave plate, especially when there are burrs, adhesions, and constant shearing at the inner diameter of the wave plate during blanking. Phenomenon, the waveform is unstable when forming a wave plate with an inclination angle, and the numerical error of the inner and outer diameters of the same batch of wave plates is as high as 0.1-0.3mm, which affects the welding and sealing effect

If the upper and lower male and female dies are used to punch materials, although it is easy to ensure the waveform size of the wave plate, this method has extremely strict requirements on the accuracy of the motion stiffness of the press, mold concentricity, flatness, mold material wear resistance, and impact resistance. and noise pollution

Therefore, domestic sealing manufacturers seldom promote bellows with an inclination angle at the inner diameter. The reason is that the blanking of the original wave plate is difficult.

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