Unlock instant, AI-driven research and patent intelligence for your innovation.

Quantitative test method for cold forging friction and lubrication conditions

A technology of cold forging friction and testing methods, which is applied in the direction of measuring devices, instruments, and mechanical devices, etc., can solve problems such as uncertainties, and achieve the effects of improving measurement accuracy, easy outer diameter measurement, and improving measurement accuracy

Active Publication Date: 2015-09-23
SHANGHAI JIAO TONG UNIV
View PDF3 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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 annealed A6082 aluminum alloy as the test workpiece material, such as figure 2 As shown, the processing is performed according to the ring outer diameter / ring inner diameter / ring height / outer boss height / outer boss width of 6 / 3 / 2 / 0.4 / 0.4, the specific ring outer diameter, ring inner diameter, The size requirements of the ring height, the height of the outer boss and the width of the outer boss 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, height, and outer diameter of the outer boss. Use a vernier caliper to take the average of three measurements. The specific values ​​are 18.03mm, 6.02mm and 20.42mm respectively;

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

[0025] The fourth step is to perfo...

Embodiment 2

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

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

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

[0033] The fourth step is to perform compression deformation under the flat mold, and t...

Embodiment 3

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

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

[0041] The third step, lubrication preparation, the use of phosphorus saponification process to perform lubrication treatment on the material to be teste...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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 test method for cold forging friction and lubrication conditions. Background technique [0002] The plastic flow of the deformed metal on the contact surface of the cold forging die and the workpiece causes friction. The friction itself is a very complex physical phenomenon, and the new surface formed during the plastic deformation of the cold forging increases its friction and lubrication. The complexity of the state. As an important boundary condition of the cold forging process, friction and lubrication conditions directly affect the plastic flow and deformation uniformity of the metal, the size of the forming force and energy consumption, the internal structure and surface quality of the formed parts, and the service life of the mold. Therefore, a correct understanding of friction a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N19/02
Inventor 胡成亮赵震
Owner SHANGHAI JIAO TONG UNIV