Notched pipe material micro-crack batch initiating device and method for fine blanking

Abstract

The invention provides a notched pipe material micro-crack batch initiating device and method for fine blanking. The device comprises a rack, wherein a plurality of metal pipe materials can be arranged side by side on the rack; a heating coil is arranged in the inner hole of each metal pipe material, and two ends of each heating coil are respectively connected with an anode E+ and a cathode E-, which are arranged at two ends of the rack, of a high-frequency cable; each heating coil is fixedly arranged on a supporting plate by virtue of an insulating core rod; the supporting plate is connected to the rack; annular V-shaped grooves with equal intervals are pre-formed in each metal pipe material; the inner walls of the pipe materials are quickly heated by virtue of the heating coils, heating is stopped when the temperature of the inner walls of the pipe materials reaches 500-1000 DEG C, and then the pipe materials are naturally cooled; micro-structure crack groups which are uniformly distributed are generated at notch root positions of V-shaped grooves outside the pipe materials under action of expansive force since temperature difference exists between inside and outside of the pipe materials, so that dynamic crack propagation in a subsequent blanking process can quickly enter into a propagation stage. By adopting the device, the whole blanking time can be shortened and the whole blanking efficiency can be improved.

Description

technical field [0001] The invention belongs to the technical field of precision blanking of pipe materials, and in particular relates to a device and method for batch initiation of micro-cracks in notched pipe materials for precision blanking. Background technique [0002] As one of the most basic forms of blanks in industrial production, metal pipes are widely used, such as various sleeves and pipe joints. The precision blanking process is often the first process in the production process. Efficiency and section quality will directly affect the complexity and processing cost of subsequent processes. The new chip-free low-stress tube material precision blanking technology developed by using the special geometric shape of the notch root to produce stress concentration effect and dynamic crack growth method makes the metal tube material blanking process realize the true sense of chip-free material-saving production. However, the key technology of the new precision blanking s...

AI Technical Summary

Problems solved by technology

For the new chipless precision blanking technology, the initiation of microstructural cracks mainly comes from the loading of loads, and the distribution and number of microstructural cracks produced by different loading forms are also different. However, limited by the loading form, the current It can only realize multi-point loading but not surface loading in the true sense, and only a few microstructural crack sources can be generated at the root of the pipe material gap

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