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Quantitative test method for cold forging friction and lubrication conditions

A cold forging friction and testing method technology, applied in measuring devices, instruments, mechanical devices, etc., can solve problems such as uncertainty, and achieve the effects of improving measurement accuracy, easy outer diameter measurement, and avoiding unstable deformation.

Active Publication Date: 2014-04-30
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method uses a ring sample with a different proportion from the commonly used ring upsetting, it does not change the deformation essence of the ring upsetting, and there is still a "drum effect" that leads to uncertainty in the measurement of the inner diameter and outer diameter after deformation. , which leads to uncertainty in subsequent friction factor calculations

Method used

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  • Quantitative test method for cold forging friction and lubrication conditions
  • Quantitative test method for cold forging friction and lubrication conditions
  • Quantitative test method for cold forging friction and lubrication conditions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The first step is to select the annealed A6082 aluminum alloy as the test workpiece material, such as figure 2 As shown, process according to the outer diameter / inner diameter / height / outer boss height / outer boss width of 6 / 3 / 2 / 0.4 / 0.4, the specific outer diameter, inner diameter, height, outer boss height and outer boss The size requirements of width are 18±0.1mm, 9±0.1mm, 6±0.1mm, 1.2±0.1mm and 1.2±0.1mm respectively;

[0023] The second step is to measure the key dimensions of the material to be tested, including the outer diameter and height of the material to be tested, and the outer diameter of the outer boss. Use a vernier caliper to measure the average value for 3 times, and the specific values ​​are 18.03mm, 6.02mm and 20.42mm;

[0024] The third step, lubrication preparation, choose VG32 lubricating oil as the lubricating medium, and use a brush to evenly coat the upper and lower plane molds;

[0025] The fourth step is to carry out compression deformation un...

Embodiment 2

[0030] The first step is to select the annealed 1060 aluminum alloy as the test workpiece material, and process according to the outer diameter / inner diameter / height / outer boss height / outer boss width of 6 / 3 / 2 / 0.4 / 0.4, the specific outer diameter , inner diameter, height, outer boss height and outer boss width are 18±0.1mm, 9±0.1mm, 6±0.1mm, 1.2±0.1mm and 1.2±0.1mm respectively;

[0031] The second step is to measure the key dimensions of the material to be tested, including the outer diameter and height of the material to be tested, and the outer diameter of the outer boss. The vernier caliper can be used to measure the average value for 3 times, and the specific values ​​are 18.01mm, 6.03mm and 20.41mm respectively;

[0032] The third step, lubrication preparation, choose VG32 lubricating oil as the lubricating medium, and use a brush to evenly coat the upper and lower plane molds;

[0033] The fourth step is to carry out compression deformation under the plane mold, and the...

Embodiment 3

[0039]The first step is to select the annealed 40Cr medium carbon steel as the test workpiece material, and process according to the outer diameter / inner diameter / height / outer boss height / outer boss width of 6 / 3 / 2 / 0.4 / 0.4. The dimension requirements of diameter, inner diameter, height, outer boss height and outer boss width are 18±0.1mm, 9±0.1mm, 6±0.1mm, 1.2±0.1mm and 1.2±0.1mm respectively;

[0040] The second step is to measure the key dimensions of the material to be tested, including the outer diameter and height of the material to be tested and the outer diameter of the outer boss. The vernier caliper can be used to measure the average value for 3 times, and the specific values ​​are 18.03mm, 6.00mm and 20.43mm respectively;

[0041] The third step, lubrication preparation, adopts the phosphorus saponification process to perform lubrication treatment on the material to be tested, so that the surface of the material to be tested forms a phosphorus saponification lubricatin...

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Abstract

The invention discloses a quantitative test method for cold forging friction and lubrication conditions in the field of measurement on friction conditions between a mold and a workpiece during plastic forming. The quantitative test method comprises the steps of processing a workpiece material to be tested into a circular ring structure of which the outer side is provided with a boss, wherein the size proportion of the circular ring structure is that a ratio of the outer diameter / the inner diameter / the height / the height of the external boss / the width of the external boss is 6 / 3 / 2 / 0.4 / 0.4; then performing lubrication treatment; performing compression deformation on the workpiece material to be tested in a planar mold, and controlling the relative reduction of the height of the workpiece material to be within 30-50 percent; searching a friction factor calibration curve according to a relative variable of the outer diameter of the external boss before and after the compression deformation of the workpiece material and the relative reduction of the height of the workpiece material so as to determine the friction factor of the contact surface of the lubricated workpiece material to be tested and the mold. According to the quantitative test method, the difficulty in measurement and the uncertainty of friction factor measurement which are caused by unstable deformation of an inner hole in the conventional circular-ring upsetting method are avoided, and the accuracy of the friction factor measurement is effectively improved.

Description

technical field [0001] The invention relates to a method in the technical field of measuring friction conditions between a mold and a workpiece in plastic forming, in particular to a quantitative testing method for cold forging friction and lubrication conditions. Background technique [0002] There is plastic flow of deformed metal on the contact surface between the cold forging die and the workpiece, which causes friction. Friction itself is a very complicated physical phenomenon, and the new surface formed continuously during the plastic deformation process of cold forging increases its friction and lubrication. state complexity. Friction and lubrication conditions, as important boundary conditions in the cold forging process, directly affect the plastic flow and deformation uniformity of the metal, the magnitude of the forming force and energy consumption, the internal structure and surface quality of the formed part, and the service life of the die. Therefore, it is of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/02
Inventor 胡成亮赵震
Owner SHANGHAI JIAO TONG UNIV