Positive extrusion test method for plastic forming friction coefficient and friction factor

A friction coefficient and friction factor technology, which is applied in the field of plastic forming friction coefficient and friction factor testing, can solve the problems of difficulty in accurately determining the position of the neutral plane, accurate measurement data, few practical applications, and inconvenient operation. Easy to operate and easy to process

Inactive Publication Date: 2013-09-04
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The main problem of this method is that it is difficult to accurately determine the position of the neutral plane and accurately measure the data, so there are few practical applications
[0015] In view of the problems of large errors and i

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  • Positive extrusion test method for plastic forming friction coefficient and friction factor
  • Positive extrusion test method for plastic forming friction coefficient and friction factor
  • Positive extrusion test method for plastic forming friction coefficient and friction factor

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[0030] In the following, specific embodiments of the present invention will be described by taking the determination of the friction coefficient and friction factor during the thermoplastic forming process of AZ31 magnesium alloy at 200° C. and the plastic forming process of 1100 aluminum alloy at room temperature as an example.

[0031] In the embodiment, the mold material of the conical die is T10A, the diameter d of the cylinder blank of 1100 and AZ31 is 18mm, the height H is 40mm, the cone angle θ of the conical die is 30°, and the small port diameter D is 16mm .

[0032] (1) Determine the friction coefficient μ and friction factor m during hot forming of AZ31 magnesium alloy at 200℃

[0033] 1) Adopt the metal material high temperature tensile test standard (GB / T4338-1995), use the AZ31 material to be tested to make tensile test specimens, and measure the yield stress Y of the material at a temperature of 200°C. In this example, the measured value of Y is 105MPa;

[0034] 2) Use...

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Abstract

The invention relates to a positive extrusion test method for a plastic forming friction coefficient and a friction factor. The positive extrusion test method comprises the following steps of 1) preparing a tensile specimen by using a to-be-tested material and measuring a yield stress Y at a to-be-tested temperature; 2) preparing a cone-shaped mold with a cone angle [theta] and the diameter of a large end port and a small end port being D0 and D respectively, by using the same material to the to-be-tested mold; 3) preparing a cylinder specimen with the diameter of d by using the to-be-tested material, wherein d value is between D0 and Dl; 4) extruding a specimen coated by a lubricating agent downward in the cone-shaped mold on a material testing machine at a constant speed and recording a value when extrusion load F starts to be stable; 5) calculating the friction coefficient and the friction factor according to formulas disclosed by the invention; and 6) repeating the above steps for 3-5 times, and taking an average value as a result. The positive extrusion test method is in no need of measuring geometrical shapes after a test specimen is deformed, has no abnormal deformations such as compressive instability and the like, is simple in specimen process and needs no theoretical calibration curve. Besides, the positive extrusion test method has high test precision, convenient operation and high efficiency, and can be used for tests at various temperatures and speed conditions.

Description

technical field [0001] The invention belongs to the field of metal plastic forming, in particular to a method for testing the friction coefficient and friction factor of plastic forming. Background technique [0002] During metal plastic forming, the workpiece is in contact with the mold and deformed under high pressure. There is always friction between the contact surface of the workpiece and the mold that prevents the flow of material. Usually, friction has a great negative impact on plastic forming, such as causing mold wear and workpiece scratches, increasing deformation resistance, changing the stress state in the deformed body, and generating residual stress. In practice, lubrication measures are often used on the contact surface between the tool and the deformed metal, that is, a certain amount of lubricant is applied to reduce the influence of friction. Due to the continuous deformation of the metal and the constant change of the friction surface during the forming ...

Claims

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Application Information

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IPC IPC(8): G01N19/02
Inventor 温彤肖冰娥陈杰
Owner CHONGQING UNIV
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