Internal high-pressure forming system for pipe fittings

Abstract

An internal high-pressure forming system for pipe fittings comprises a rack, a slider and molds. Three stages of clamping force-increasing mechanisms are arranged between the upper portion of the rack and the slider, and the first-stage force-increasing mechanism is formed by a clamping servo motor, a speed reducer and a roller screw; a connector and a group of bilaterally symmetrical upper connecting rods, small connecting rods and lower connecting rods form a secondary force-increasing mechanism and a ternary force-increasing mechanism; high-precision pressure sensors are mounted on the upper mold and form a pressure detection system with a control system; axial pipe billet feeding mechanisms disposed symmetrically are arranged between the slider and the lower portion of the rack. The clamping servo motor drives the three-stages of force-increasing mechanisms to perform clamping, clamping force is increased accurately in the forming process according to the size of increasing internal pipe forming pressure on inner cavities of the molds, the molds are kept closed constantly during forming while the molds are small in deformation under the force action, and accordingly service life of the molds is prolonged, and pipe fitting forming quality is improved; the internal high-pressure forming system is capable of controlling the clamping force in real time and has the advantages of convenience in control, simple structure and low cost.

Description

technical field [0001] The invention belongs to the technical field of internal high-pressure forming equipment for pipe fittings, and in particular relates to an internal high-pressure forming system for pipe fittings. Background technique [0002] At present, as the automotive, aviation, aerospace and machinery industries have higher and higher demands for mechanism integration and light weight, internal high pressure forming technology has been widely used, and has gradually become a method for manufacturing complex special-shaped cross-section light-body components in industrial production. An advanced forming technology. Especially in the production of automobiles, high-speed rail, and aircraft, the internal high pressure forming processing method is gradually replacing the original traditional processing method. The basic process of internal high pressure forming technology is as follows: first put the tube blank in the lower mold, then close the upper mold, seal the ...

AI Technical Summary

Problems solved by technology

Since the tube blank is formed under the combined action of internal high hydraulic pressure and axial force, the high pressure source must generate an internal pressure of hundreds of MPa inside the part, so there must be sufficient clamping force between the upper and lower molds to eliminate the internal high pressure during the forming process The reverse driving force on the mold ensures that the upper and lower molds are not separated, but if the mold clamping force is too large, it will cause serious deformation and wear of the mold, and the life of the mold will be greatly shortened

Therefore, the clamping force of the mold should be appropriate in the pipe forming process. If it is too large, it will cause too much damage to the mold. If it is too small, the upper and lower molds will be separated, and the quality of the pipe cannot meet the forming requirements.

[0003] In recent years, due to the integration and high-precision development of internal high pressure forming parts, the size of internal high pressure forming parts has gradually increased, and the fillet of pipe fittings has gradually decreased, which has led to a substantial increase in the internal high pressure source and clamping force for forming.

The opening and closing and locking of traditional hydraulic press molds are realized by the same oil cylinder. Due to the large opening and closing stroke of the mold and the huge clamping force, the scale of the oil cylinder is very large.

;During the forming process, the hydraulic cylinder pushes the slider to lock the mold directly in one step, and the molds are subjected to a huge clamping pressure, and the clamping force is always kept near the maximum clamping force, so the entire forming process requires extremely high Oil pressure is used to maintain the mold clamping force. However, the mold clamping force is small at the initial stage of forming, resulting in unnecessary waste of resources. At the same time, because the mold is always under huge mold clamping pressure, the mold deformation is large, which makes the quality of pipe fittings and low precision

Traditional hydraulic press equipment requires huge investment, bulky size, high energy consumption, low mold life, low production efficiency, high noise, low slider movement control precision, and limited locking force, especially not suitable for large pipe fittings

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