A vertical traction thermal friction testing machine that overcomes the gravity bending of high temperature sheet materials
A friction testing machine and high temperature plate technology, applied in the analysis of materials, the use of mechanical devices, instruments, etc., can solve the problems affecting the accuracy of the friction coefficient, damage to the pressure sensor, inaccurate pressure application, etc. The effect of pressure always vertical
Active Publication Date: 2022-07-05
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
The pressure loading of the horizontal friction testing machine mostly adopts the method of vertical weight loading and thread progressive loading. The actual positive pressure on the sheet material also needs to consider the self-weight of some mechanisms, which will easily lead to damage to the pressure sensor and inaccurate pressure application, thereby affecting Accuracy of Coefficient of Friction
The deformation during the hot stamping process of the sheet metal is complicated, but when there is accumulation of wear debris or bulges on the surface of the die or the sheet metal, the sheet material may pass over the bulge during deformation, while the traditional friction testing machine, the friction pair and the plate The materials are tightly bonded, and it is easy to prevent the movement of the sheet due to the accumulation of friction debris, resulting in a sharp increase in the friction coefficient, which in turn leads to low test accuracy.
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[0030] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0031] see figure 1 , figure 2 , image 3 and Figure 4 , The present invention provides a vertical pulling thermal friction tester that overcomes the gravity bending of high-temperature sheet materials. The vertical pulling thermal friction testing machine includes a pulling force pulling unit, a pressure loading unit, a heating device, and an infrared thermometer 1 , a cooling device and a ba...
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The invention belongs to the technical field of friction testing, and discloses a vertical pulling thermal friction testing machine capable of overcoming the gravitational bending of high-temperature sheet materials. A traction unit, a pressure loading unit and a base, so that the axial direction of the elongated experimental sheet is perpendicular to the ground; the pressure loading unit includes a floating friction unit, and the floating friction unit is a split structure, which includes a first friction unit The auxiliary connecting head, the second friction pair connecting head, the first friction pair and the second friction pair, the first friction pair and the second friction pair are arranged opposite to each other in the horizontal direction, and the two are used together to closely adhere to the test object to be tested. Sheet material; wherein a floating connection is formed between the first friction pair connecting head and the first friction pair, and a floating connection is also formed between the second friction pair connecting head and the second friction pair. The invention avoids the abnormal increase of the friction coefficient and can overcome the gravity bending of the high temperature sheet metal.
Description
technical field [0001] The invention belongs to the technical field of friction testing, and more particularly relates to a vertical pulling thermal friction testing machine capable of overcoming the gravity bending of high-temperature sheet metal. Background technique [0002] Frictional behavior at high temperature is an important concern in hot stamping of aluminum alloys and high-strength steels. Under high temperature conditions, the friction coefficient between the sheet metal and the mold will increase significantly, which may easily cause problems such as sticking, scratching, and even cracking, which brings great challenges to obtaining high-quality products and extending the life of the mold. The study of friction behavior during hot stamping of sheet metal plays an important guiding role in the structural optimization of die parts and the selection of lubricants, and the accurate measurement of the friction coefficient at high temperature can provide accurate guid...
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IPC IPC(8): G01N19/02
CPCG01N19/02
Inventor 王义林朱彬方冬雨张宜生
Owner HUAZHONG UNIV OF SCI & TECH