How many kinds of hardness are indicated in rubber materials?
Shore hardness tester edited by this paragraph, shore hardness is classified as Shao rubber A type hardness tester, shore rubber D type hardness tester. Shore hardness tester is a handheld hardness tester that can accurately measure the shore hardness of rubber (plastic) products. It measures the penetration of the specified pressure needle under the specified pressure and time. It is the ideal testing instrument in the field. The utility model has the advantages of convenient carrying, beautiful appearance, light weight, etc..
According to the hardness of the test material, three different scales are used to represent the hardness:HRA: the hardness obtained by means of 60kg load and diamond cone press. Used for extremely hard materials.HRB: the hardness of the steel ball, which is hardened by 100kg load and 1.58mm diameter, is applied to the material with lower hardness. HRC: the hardness obtained by means of a 150kg load and a diamond cone press. Used of materials of high hardness.The Vivtorinox hardness tester press the diamond square cone press in the load of 120kg and the vertex angle is 136 degrees, press the surface of the material, and the surface product of the indentation dent is divided by the load value, that is, the Vivtorinox hardness HV value (kgf/mm2).
Rockwell hardness (HR) editor this paragraph, when HB>450 or sample is too long, can not use Brinell hardness tester and Rockwell hardness tester. It is a diamond cone with a vertex angle of 120 degrees or a ball with a diameter of 1.59 and 3.18mm. It is pressed into the surface of the tested material under certain loads. The hardness of the material is determined by the depth of the indentation.
In mechanics, two very important indexes are generally measured by universal testing machines, and hardness is measured by a hardness tester. In general, universal testing machines and hardness testers are all materials testing machines. The hardness tester, according to the characteristics of different materials, need to use different hardness tester for determination. Among them, the most widely used are Rockwell hardness tester, Brinell hardness tester, shore rubber hardness tester, Vivtorinox hardness tester, and Brinell hardness tester.
