Extrusion forming mold for cylinder with rib-equipped inner and outer special-shaped surfaces

Abstract

The invention discloses an extrusion forming mold for a cylinder with rib-equipped inner and outer special-shaped surfaces. The extrusion forming mold comprises an upper mold plate, a core shaft, a separated concave mold, a prestressed ring, a separated convex mold mechanism, a lower mold plate, an ejection mechanism and a mold release mechanism, wherein the upper end of the core shaft is fixedly arranged below the upper mold plate, and the lower end of the core shaft is provided with a cone-shaped head; the prestressed ring is arranged above a lower backing plate, and a straight-wall cavity is formed in the middle of the prestressed ring; an ejection rod mechanism comprises an ejection rod and an ejection block, the ejection rod is movably arranged in an ejection rod through hole of the lower mold plate, and the ejection block is arranged at the bottom of the straight-wall cavity; the separated concave mold is integrally and movably arranged in the straight-wall cavity and is longitudinally divided into more than two petals, a concave mold cavity is formed in the middle of the separated concave mold, and a inverted-cone-shaped mold-separating cavity is formed in the outer periphery of the top of the separated concave mold; the separated convex mold mechanism is integrally arranged in the concave mold cavity and comprises a separated convex mold and a convex mold fixing plate, an inverted cone-shaped cavity is formed in the middle of the separated convex mold, a cone-shaped head is formed at the outer periphery of the top of the separated convex mold, the separated convex mold is divided into more than two petals, and each convex mold can slide on the convex mold fixing plate along the radial direction; the mold release mechanism comprises a stroke extending block and a stroke returning ring, a cone-shaped ring cavity is formed in the middle of the stroke returning ring, and the stroke extending block is a wedge-shaped block.

Description

technical field [0001] The invention belongs to the metal extrusion forming technology, and relates to the extrusion forming technology of thin-walled parts which are difficult to form and demould, in particular to an extrusion forming die of a cylinder with inner and outer special-shaped surfaces and ribs. Background technique [0002] With the rapid development of high-tech industries such as aerospace, it is urgent to adopt a large number of large light alloy integral thin-walled components with light structure and small shape complex coefficient to reduce weight and improve the working performance of the whole machine. The large-scale overall complex thin-walled shell with inner and outer ribs is a typical representative, such as Figure 4 A ribbed tube 10 with inner and outer special-shaped surfaces shown is a part that is difficult to remove from the punch and die. The inner and outer walls 102, 101 of the inner and outer special-shaped surfaces 10 are all curved surfac...

AI Technical Summary

Problems solved by technology

The large-scale overall complex thin-walled shell with inner and outer ribs is a typical representative, such as Figure 4 A ribbed tube 10 with inner and outer special-shaped surfaces shown is a part that is difficult to remove from the punch and die. The inner and outer walls 102, 101 of the inner and outer special-shaped surfaces 10 are all curved surfaces, and the inner and outer curved surfaces contain prominent inner ribs 104 and outer ribs. 103; This kind of complex component that is difficult to demould and form is thin, light in weight, complex in shape, and high in performance requirements. At present, the casting process is used. Although the material utilization rate has been improved, due to the impact of various casting defects such as casting sand holes and looseness , the yield of parts is low, and the most important thing is that the mechanical properties of casting materials are low, which cannot meet the design requirements of high-strength workpieces

[0003] At present, there is also a method of machining, but it must be extruded into a thick-walled shell, and then the inner and outer ribs are processed by cutting. The processing is difficult, and the processed parts require multiple sets of auxiliary processing tools, which is costly and can be damaged by machining. The metal streamlines are formed, the performance is far lower than that of extrusion parts, the processing efficiency is low, and the material utilization rate is only about 10% to 20%, which cannot meet the needs of mass production.

[0004] Only the method of plastic forming can meet the requirements, but it is difficult to extrude the inner and outer curved surfaces of this type of parts by traditional plastic forming methods, and it is impossible to extrude these thin-walled parts with complex inner shapes, irregular curves of inner and outer surfaces and inner and outer ribs. It is also difficult to demould the mold and die. In order to solve the shortcomings of the traditional extrusion method, which is difficult to form internal and external ribs, curved surfaces, and difficult to demould, develop a mass-produced, high material utilization rate, high efficiency, good product performance, and low cost. , The mold that the workpiece is easy to form has great significance

Images