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Method for obtaining heterogeneous metal sheet by using composite stamping

A metal thin plate, heterogeneous technology, applied in the direction of metal processing equipment, metal layered products, chemical instruments and methods, etc., can solve the problem that it is difficult to guarantee the bonding strength of the composite interface, the work hardening ability of the material is difficult to guarantee, and the accuracy of the surface treatment of the material is relatively high. Advanced problems, to avoid the doping of impurities and interface oxidation, the flexibility of structure design, the effect of simple process

Active Publication Date: 2020-09-15
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are the following problems in this technology: (1) The processing accuracy of the material surface is high, and it is difficult to control the oxidation of the interface; (2) After multiple processes, the work hardening ability of the material is difficult to guarantee
Its limitations are: (1) The processing work before rolling includes multiple processes such as surface cleaning, cutting, argon arc welding sealing, heating, etc., with high operation requirements and low production efficiency; (2) It is difficult to guarantee the bonding strength of the composite interface

Method used

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  • Method for obtaining heterogeneous metal sheet by using composite stamping
  • Method for obtaining heterogeneous metal sheet by using composite stamping
  • Method for obtaining heterogeneous metal sheet by using composite stamping

Examples

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preparation example Construction

[0033] A novel preparation method of heterogeneous materials. Using the composite stamping process, the martensitic phase transformation is induced by deformation to form a soft and hard structure in the material, and a three-dimensional controllable and designable heterogeneous structure is prepared.

[0034] The composite stamping process specifically includes assembling a detachable mold a on the stamping head of the stamping equipment, stamping sample I to obtain sample II, assembling mold b conjugated with mold a to stamp sample I to obtain sample III, and combining several samples Ⅱ and sample Ⅲ are stacked according to the concave-convex shape of the surface to form a gap-free Ⅲ-Ⅱ…Ⅲ laminated structure, and stamped with a press head equipped with a flat die, and the residual stress is eliminated after heat treatment to form an A / B phase heterogeneous structure. Using high toughness The back stress strengthening and back stress work hardening between phase and high-stren...

Embodiment

[0046] Preparation of Heterogeneous Metal Sheets by Composite Stamping 22Mn5B

[0047] (1) Pretreatment: Select the material 22Mn5B that can deform the martensitic phase, temper it at a high temperature above 1000°C and then cool it in the air to reduce the yield strength to below 100MPa. According to the inscribed square of the indenter disc with a diameter of 800mm, cut 3 plates of 550mm×550mm×1.8mm (length×width×thickness), grind their surfaces with a grinder, finely grind them with sandpaper, and clean and dry them for later use as raw materials Sample I.

[0048] (2) Stamping of complex molds: assemble the upper and lower press heads of the stamping equipment with detachable mold a, and apply G016 lubricating oil on the mold, send sample I between the upper and lower mold a at a rate of 200mm / s, and evacuate to 100Pa and filled with inert gas Ar to atmospheric pressure, heated to 450°C at a rate of 20°C / s and kept warm, stamping and deforming the sample at a stamping rat...

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Abstract

The invention discloses a method for obtaining a heterogeneous metal sheet by using composite stamping. The method for obtaining the heterogeneous metal sheet by using composite stamping comprises thesteps that four steps of process of pretreatment, complex die stamping, flat stamping and heat treatment are carried out, specifically, a deformation-induced martensitic transformation material is used as an original material, a pair of conjugated molds are used for heating and stamping pretreated odd number of raw material plates I separately to obtain samples II and samples III, the samples IIand samples III are conjugated according to the surface concave-and-convex shape to form a gapless III-II...III laminated structure, heating flat stamping is carried out, and then heat treatment is carried out, so that the heterogeneous metal sheet is formed. The back stress strengthening and back stress work hardening between a high toughness phase and a high strength phase are used for achievingthe excellent mechanical properties of high strength and high toughness. Through controlling of the selection of raw materials, the design of the stamping die, the flexibility of a laminated method and the like, the different strengthening and toughening requirements in production and application are met.

Description

technical field [0001] The invention belongs to the field of preparation of heterogeneous materials, and in particular relates to a method for obtaining heterogeneous metal sheets by compound stamping. Background technique [0002] Metal structural materials are widely used in military, industrial, aviation and other fields. High strength and high toughness are the performance goals that are constantly pursued in the research field of metal structural materials. People improve the mechanical properties of materials through various strengthening and toughening mechanisms, so that they have better performance and safety. However, for homogeneous materials, the improvement of strength is often at the expense of plasticity, which severely limits the application and development of metal structural materials. Therefore, how to achieve both strength and plasticity is a hot spot and focus in the research of metal structural materials. [0003] Heterogeneous materials are a new typ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/02B21D22/02B21D37/10B21D37/18B32B15/01B32B15/18B32B3/30B32B3/06B32B37/10B32B38/00C21D1/26C21D1/74C21D9/46
CPCB21C37/02B21D22/02B21D22/022B21D37/10B21D37/18B32B15/011B32B15/013B32B3/30B32B3/06B32B37/10B32B38/0012B32B38/0036C21D1/26C21D1/74C21D9/46B32B2038/0016B32B2038/0048B32B2307/558C21D2211/001C21D2211/008
Inventor 周浩黄家喜陈雪飞许梦凝瞿振宇肖礼容李玉胜曹阳
Owner NANJING UNIV OF SCI & TECH
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