Extrusion molding method for curved generatrix hole

A bus hole and curve technology, which is applied in the field of processing curve bus holes, can solve the problems of high processing cost, low production efficiency, affecting excellent characteristics, etc., and achieve the effect of saving processing cost, low forming force and simple mold.

Inactive Publication Date: 2005-11-23
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

The traditional mechanical cutting processing method is difficult to realize, the special processing method has special requirements for equipment, the processing cost is expensive, and the requirements for operators are also high, and the production efficiency is low, which is not conducive to batch processing and production. The use of the so-called Laval nozzle in disguise has affected the true performance of its excellent characteristics

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  • Extrusion molding method for curved generatrix hole
  • Extrusion molding method for curved generatrix hole
  • Extrusion molding method for curved generatrix hole

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Embodiment Construction

[0022] The open cold extrusion adopted in the present invention is a high-efficiency, energy-saving, and material-saving forming processing technology, which is generally suitable for shaft sleeve parts. Compared with the closed type, the open cold extrusion also has the advantages of simple molds, low forming force, Unique advantages such as energy saving and pollution-free. Open cold extrusion technology can produce busbar curve hole parts that cannot or are difficult to produce by traditional processing methods, such as various streamlined inner holes. These streamlined curves can be parabolic, hyperbolic, etc.

[0023] An example of this invention is the machining of Laval nozzles.

[0024] figure 1 is a cutaway view of the Laval nozzle. In the figure, Laval nozzle 1 is divided into three parts: contraction section 2, throat mouth 3, and expansion section 4. The cross-section of the pipe is a process of continuous change from large to small, and then from small to large....

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Abstract

This invention relates to a method for processing curve generatrix hole, which belongs to metal non-cutting technology field. It uses opening koldflo technique, and comprises the following steps: a) designing the external block shape according to the shape of bore parts and consulting the relationship between key parameter, wherein the height of raw block H0=h+3-7mm, and the outline shape is similar to the mirror phase line of the generatrix in the bore; processing the block; b) designing handling mold, making D0-DM= (0.14-0.18)DM, wherein the DM is diameter of cutting edge, D0 is the largest diameter of block; c) coating lubricating agent on the surface of block and mold; d) extrusion forming; e) fine finishing to reach to the required size and precision.

Description

technical field [0001] The invention relates to a method for processing curved busbar holes, and belongs to the technical field of non-cutting processing of metal profiles. Background technique [0002] In production practice, we often encounter the processing problem of part curve generatrix hole. The most typical and widely used representative part in the curved busbar hole is the Laval nozzle (nozzle, nozzle). The Laval nozzle is a contraction-expansion nozzle through which a gas with a certain pressure and a lower velocity can generate a supersonic flow. It is generally composed of three parts: contraction section, throat opening, and expansion section, and has the unique characteristic of obtaining supersonic airflow. It can be seen from aerodynamics that to generate supersonic flow, the throat needs to adopt a variable-section pipe, and the gas is first accelerated to the speed of sound in the contraction section, and then accelerated to supersonic flow in the expans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/02
Inventor 李军张双杰鲁素玲韩鹏彪毛浩恩刘玉忠王丽娟
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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