What does mold manufacturing HRC mean
2020年1月10日 日常What does mold manufacturing HRC mean?
Mold manufacturing HRC refers to hardness, Rockwell hardness.
HRC (Chinese name: Rockwell hardness) is an academic concept put forward by Rockwell (SPRockwell) in 1921. It is the hardness value of metal materials measured using Rockwell hardness tester. There is no unit for this value, only the code "HR" is used.
Hardness is the ability of a material to resist the penetration of foreign objects. The most common method for testing the hardness of steel is to file on the edge of the workpiece with a file, and the depth of the scratches on the surface to determine the hardness of the steel. This method is called the file test method, this method is not scientific.
The hardness tester is extremely accurate and is a commonly used method for modern hardness testing. The most commonly used test method is the Rockwell hardness test. The Rockwell hardness tester uses the depth of the diamond to penetrate the metal to determine the hardness of the metal. The greater the depth of the penetration, the smaller the hardness.
Extended information:
I. Hardness Standard
Rockwell hardness HRA, HRB, A, B, C in HRC are three different standards. They are called scale A, scale B, and scale C.
1. HRA is a hardness obtained by using a 60Kg load and a 120 ° diamond cone indenter, which is used for materials with high hardness. For example: cemented carbide.
2. HRB is a hardness obtained by using a 100Kg load and a hardened steel ball with a diameter of 1.59mm. It is used for materials with medium hardness. For example: annealed steel, cast iron, etc.
3. HRC is a hardness obtained by using a 150Kg load and a 120 ° diamond cone indenter, which is used for extremely hard materials. For example: quenched steel.
Measurement method
The measurement method is: under the specified external load, a steel ball or a diamond indenter is vertically pressed into the surface of the material to be tested, and a dent is generated. According to the depth of the dent after the load is released, the Rockwell hardness calculation formula HR = ( KH) / C can calculate the Rockwell hardness. The Rockwell hardness value is displayed on the dial of the hardness tester and can be read directly.
In the above formula, K is a constant, K = 0.2MM at the diamond indenter, K = 0.26MM at the quenched steel ball indenter; H is the indentation depth of the test piece after the main load is released; C is also a constant, and generally C = 0.002MM.
It can be seen that the shallower the indentation, the larger the HR value, and the higher the material hardness. For high-hardness knife materials, HRC is commonly used in the knife industry to indicate the blade hardness, such as 60HRC, which represents the indentation of the test material when the test load is 1471.1N and the diamond cone indenter with a vertex angle of 120 ° is used. The depth is 0.08MM.
In general, the higher the hardness, the higher the abrasion resistance, but the greater the brittleness. The hardness of general high-speed steel is 62 ~ 66HRC, high-performance high-speed steel 63 ~ 70HRC, and hard alloy cutting tools 70 ~ 75HRC.
Source:https://www.msplasticmold.com/product/cratesbaskets/
Mold manufacturing HRC refers to hardness, Rockwell hardness.
HRC (Chinese name: Rockwell hardness) is an academic concept put forward by Rockwell (SPRockwell) in 1921. It is the hardness value of metal materials measured using Rockwell hardness tester. There is no unit for this value, only the code "HR" is used.
Hardness is the ability of a material to resist the penetration of foreign objects. The most common method for testing the hardness of steel is to file on the edge of the workpiece with a file, and the depth of the scratches on the surface to determine the hardness of the steel. This method is called the file test method, this method is not scientific.
The hardness tester is extremely accurate and is a commonly used method for modern hardness testing. The most commonly used test method is the Rockwell hardness test. The Rockwell hardness tester uses the depth of the diamond to penetrate the metal to determine the hardness of the metal. The greater the depth of the penetration, the smaller the hardness.
Extended information:
I. Hardness Standard
Rockwell hardness HRA, HRB, A, B, C in HRC are three different standards. They are called scale A, scale B, and scale C.
1. HRA is a hardness obtained by using a 60Kg load and a 120 ° diamond cone indenter, which is used for materials with high hardness. For example: cemented carbide.
2. HRB is a hardness obtained by using a 100Kg load and a hardened steel ball with a diameter of 1.59mm. It is used for materials with medium hardness. For example: annealed steel, cast iron, etc.
3. HRC is a hardness obtained by using a 150Kg load and a 120 ° diamond cone indenter, which is used for extremely hard materials. For example: quenched steel.
Measurement method
The measurement method is: under the specified external load, a steel ball or a diamond indenter is vertically pressed into the surface of the material to be tested, and a dent is generated. According to the depth of the dent after the load is released, the Rockwell hardness calculation formula HR = ( KH) / C can calculate the Rockwell hardness. The Rockwell hardness value is displayed on the dial of the hardness tester and can be read directly.
In the above formula, K is a constant, K = 0.2MM at the diamond indenter, K = 0.26MM at the quenched steel ball indenter; H is the indentation depth of the test piece after the main load is released; C is also a constant, and generally C = 0.002MM.
It can be seen that the shallower the indentation, the larger the HR value, and the higher the material hardness. For high-hardness knife materials, HRC is commonly used in the knife industry to indicate the blade hardness, such as 60HRC, which represents the indentation of the test material when the test load is 1471.1N and the diamond cone indenter with a vertex angle of 120 ° is used. The depth is 0.08MM.
In general, the higher the hardness, the higher the abrasion resistance, but the greater the brittleness. The hardness of general high-speed steel is 62 ~ 66HRC, high-performance high-speed steel 63 ~ 70HRC, and hard alloy cutting tools 70 ~ 75HRC.
Source:https://www.msplasticmold.com/product/cratesbaskets/
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