Large-section hollow profile extrusion forming method and device with small-opening die utilized

Abstract

The invention discloses a large-scale hollow profile extrusion forming method and device with a small-opening die utilized. The method includes the steps that inflation is conducted on a blank piece extruded from a die head through compressed air, a layer of narrow-seam-shaped air cushion with the same shape as the hollow shape of a product is formed in the blank piece, the blank piece is tightly attached to the inner wall of a vacuum shaping sleeve under further expansion of the air cushion, the hollow pipe product is formed under the synergistic effect of the air cushion and vacuum shaping, and the purpose that large-section hollow profiles are prepared continuously through the small-opening die is achieved. The device comprises an extrusion machine, the die head and a vacuum cooling shaping device which are sequentially connected. An inflation device is arranged in the die head and comprises a core rod, an air inlet pipe and an inner cold-air plug. The air inlet pipe is arranged in the middle of the core rod. The rod portion of the inner cold-air plug is arranged in the air inlet pipe. The head portion of the inner cold-air plug is arranged in a space between the die and the vacuum cooling shaping device. A blank forming runner is formed between the outer wall of the core rod and the die head. The method and device are simple in principle and easy to operate and control, and meanwhile the obtained product is wide in use range.

Description

technical field [0001] The invention relates to the technical field of extrusion molding of hollow profiles, in particular to a large cross-section hollow profile extrusion molding method and equipment using a small die. Background technique [0002] Hollow profiles are distinguished according to the cross-section, generally divided into round tubes and special-shaped tubes, among which special-shaped tubes include oval special-shaped tubes, square tubes, triangular tubes, semi-circular special-shaped tubes, five-petal plum-shaped special-shaped tubes, etc. Plastic hollow profiles have the characteristics of light weight, high strength, and corrosion resistance, and are widely used in different fields such as building materials, electrical appliances and electronics, fluid transportation, and furniture. With the growth of the national economy, the market demand for hollow profile products, especially large cross-section hollow profiles, is huge. [0003] The traditional pro...

AI Technical Summary

Problems solved by technology

In actual production, the traditional production equipment for hollow profiles has the following disadvantages: (1) The cross section of the extruded hollow profile is similar in shape to the exit section of the die head, but in terms of size, the size of the exit section of the die head is larger than that of the extruded section. Extrude the size of the section of the hollow profile; due to the above-mentioned difference in size, when extruding a hollow profile with a large section size, the design size of the die head must also be enlarged according to the corresponding section, that is, only a small die can produce a small section hollow profile , the case of producing large cross-section hollow profiles with large dies; when producing large cross-section hollow profiles, the volume and weight of the die head will inevitably be too large, which is not conducive to precision control and equipment cost control; (2) If products with complex shapes are to be produced, corresponding (3) The shape and size of the die outlet section determine the type of hollow profile produced, which limits the product range of the equipment; (4) Hollow profiles produced by traditional methods are prone to internal In the case of large stress and warping deformation

Although the device has a simple structure, it needs to add an additional driving device to move the clamping rod, which increases the equipment cost, and the expansion parameters cannot be adjusted, which cannot be adjusted according to the actual production situation and materials

[0005] Aiming at the problems existing in the current large-section hollow profile processing methods and equipment, such as complex and bulky equipment, difficult equipment processing, small application range, and unsatisfactory product performance, a method and equipment for extrusion molding of large-section hollow profiles using small dies have been developed. great significance

Images