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A Method and Device for Evaluation of Friction Scale Effect in Plastic Micro-volume Forming

A scale effect and evaluation device technology, which is applied to measuring devices, mechanical devices, instruments, etc., can solve the problems of uniform lubricant application and storage difficulties, and achieve the effects of large expansion rate, solving test problems, and accurate testing

Active Publication Date: 2014-10-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problem of difficulty in uniform application and storage of lubricant in the existing plastic micro-volume forming friction coefficient test method, the present invention proposes a plastic micro-volume forming friction scale effect evaluation method and evaluation device based on T-shaped micro-upsetting method, Solved the problem of measuring the friction coefficient of plastic micro-forming under different lubrication conditions

Method used

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  • A Method and Device for Evaluation of Friction Scale Effect in Plastic Micro-volume Forming
  • A Method and Device for Evaluation of Friction Scale Effect in Plastic Micro-volume Forming
  • A Method and Device for Evaluation of Friction Scale Effect in Plastic Micro-volume Forming

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specific Embodiment approach 1

[0024] Specific implementation mode one: as Figure 1~2 As shown, a method for evaluating the scale effect of friction in plastic micro-volume forming described in this embodiment is realized according to the following steps:

[0025] Step 1. The T-shaped micro-upsetting experiment method is used to carry out the plastic micro-volume forming (micro-forming) experiment. The experiment is based on the micro-punch 1, the cylindrical sample 2 (cylindrical blank) and the V-shaped groove die 3 to achieve;

[0026] During the T-shaped micro-upsetting experiment, the cylindrical sample 2 is deformed under the action of the micro punch 1, and is filled into the V-shaped groove of the V-shaped groove die 3, so that the cross-sectional shape of the formed part is T shape;

[0027] Step 2. The load of the micro-punch is linearly related to the friction force during the filling process, and the slope of the punch load-punch displacement curve is used to represent the friction coefficient...

specific Embodiment approach 2

[0033] Specific implementation mode two: as Figure 3-9 As shown in this embodiment, a plastic micro volume forming friction scale effect evaluation device for implementing the evaluation method described in Embodiment 1, the device includes an upper layer I, a middle layer II, a lower layer III, a micro punch 1 and a V Type groove die 3; The upper layer I is composed of an upper template 6, an upper backing plate 7 and a punch fixing plate 8 arranged from top to bottom, and the upper layer I is positioned by a pin and connected by a screw; The middle layer II is composed of an intermediate backing plate 9, a clamping plate 10 and a heating ring 16. The intermediate backing plate 9 is located above the clamping plate 10, and the heating ring 16 is installed in the center hole on the clamping plate 10; the lower layer III is fixed by a die plate 11 It is composed of the lower mold base 12, and the die fixing plate 11 is located above the lower mold base 12; the upper layer I, t...

specific Embodiment approach 3

[0034] Specific implementation mode three: as Figure 3-9 As shown, in this embodiment, the clamping plate 10 in the middle layer II and the die fixing plate 11 in the lower layer III are each equipped with four guide sleeves 4 . Other components and connections are the same as those in the second embodiment.

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Abstract

The invention provides a plastic micro volume forming friction scale effect evaluating method and device, which belong to the field of precision forming micro frictions; and a measuring problem of plastic micro forming friction coefficients under different lubricating conditions is solved. An experiment is achieved on the basis of a micro punching head, a cylindrical test sample and a V-shaped groove female die; a friction coefficient in the micro forming process is represented by the slope of a punching head load-punching head displacement curve; and a parameter K is defined as the slope of the punching head load-punching head displacement curve during filling the cylindrical test sample into a V-shaped groove in the T-shaped micro-upsetting experiment process and used as an evaluation parameter for evaluating the friction scale effect of the micro volume forming process; the device comprises an upper layer, a middle layer and a lower layer; a working end of the lower part of the micro punching head is positioned in a heating ring; the V-shaped groove female die is mounted on a female die fixing plate; and the V-shaped groove female die is positioned right below the micro punching head; and a force sensor is fixed in an upper lining plate and positioned on the micro punching head. The plastic micro volume forming friction scale effect evaluating method and device, provided by the invention, are especially suitable for evaluating the plastic micro volume forming friction scale effect.

Description

technical field [0001] The invention relates to a plastic micro-volume forming friction scale effect evaluation device, which is particularly suitable for testing the friction coefficient of the plastic micro-volume forming process, and belongs to the field of precision forming micro-friction. Background technique [0002] According to the traditional plastic forming theory, in the process of metal plastic forming, the coefficient of friction or friction factor is constant and has nothing to do with the size of the sample. However, in the field of plastic microforming, as the sample size decreases, the friction coefficient or friction factor also changes, resulting in an obvious friction scale effect. On the basis of the traditional friction coefficient test, a variety of micro-forming friction evaluation methods have been proposed according to the principle of similarity, such as cylinder compression test method, ring compression test method, forward extrusion test method a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N19/02
Inventor 徐杰郭斌单德彬王春举
Owner HARBIN INST OF TECH
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