Method for preparing semi-solid blank material by using liquides line die stamping process

A semi-solid, liquidus technology, applied in wire processing, metal rolling, application, etc., can solve the problems of blank specification limitation, inability to directly form parts, etc., and achieve the effects of stable quality, low cost and simple process

Inactive Publication Date: 2004-07-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, these methods are all under research, and the blank specifications are also limited, and they cannot directly form parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] LD10 bar semi-solid forming

[0020] Bar specification: φ120×250mm

[0021] Organization: Primary grain size 0.2 ≥380Mpa, б b ≥480Mpa,

[0022] б≥10%

[0023] Process parameters: mold temperature>400℃, specific pressure>100MPa

[0024] Holding time: 60sec, pouring temperature 641℃

[0025] Lubrication: Oil Colloidal Graphite

Embodiment 2

[0027] AlSi 17 Semi-solid Forming of Pistons for Mg Miniature Automobiles

[0028] 1) Make a billet φ62×125 by imitating Example 1, and its process parameters: mold temperature > 400°C, specific pressure > 100MPa, pressure holding time 40sec, pouring temperature 620°C, lubrication: colloidal graphite;

[0029] 2) Cut into φ62×40;

[0030] 3) Thixotropic forming: mold temperature > 300°C, specific pressure > 100MPa, holding pressure 20sec, semi-solid billet secondary heating temperature 580°C;

[0031] 4) Mechanical properties: in CS state: б b ≥270Mpa, б 0.2 ≥2%

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PUM

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Abstract

The method for preparing semisolid blank material by using liquidus line die stamping process includes the following steps: in melting furnace mixing and melting alloy components according to the requirements, then injecting the above-mentioned mixture material into heat-insualting lalde, regulating temp. to make it be 3-5 deg.C higher than alloy liquidus line, after the internal temp. of heat-insulating ladle is uniformized to the required temp., injecting the melt being in heat-insulating ladle into die cavity, applying mechanical static pressure and retaining pressure so as to obtain the fine semisolid blank material and product with spherocrystal structure.

Description

Technical field: [0001] The invention belongs to the field of material processing. Background technique: [0002] There are many semi-solid preparation methods, but at present, only the electromagnetic stirring method has been successfully used in the production. But it consumes a lot of energy, and it is not suitable for the preparation of large-size (>φ152mm) blanks, nor can it be directly made into parts. The strain-induced melting activation method (SIMA) has the potential for industrial application, but adding a pre-deformation process increases the cost of the billet. At the same time, it is only suitable for small-sized billets and cannot directly form parts. In addition, there are controlled cooling solidification method and liquidus casting method. However, these methods are all under research, and the specifications of the blank are also limited, and the parts cannot be directly formed. The object of the present invention aims at the deficiencies in the prior...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/46B21F99/00B21J1/02B21J1/04B22D17/00B22D18/02B22D27/09
Inventor 罗守靖杜之明
Owner HARBIN INST OF TECH
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