This standard specifies the test method for determining the Rockwell hardness of friction materials. This standard applies to dry friction material products; it does not apply to powder metallurgy friction material products. GB/T 5766-1996 Friction material Rockwell hardness test method GB/T5766-1996 Standard download decompression password: www.bzxz.net

ICS_25:100.71
National Standard of the People's Republic of China
GB/T 5766-1996
Test method for Rockwell hardness of friction materials
Tesl lelhod ol Rockwel hardness forfriction natcrials1996-05 27 Issued
1996-12-01 ImplementationbzxZ.net
National Standard of the People's Republic of China
Test method for Rockwell hardness of friction materials
Test niethod nr Kockwell hi'dacss fur frirliun ualerials content and applicable limits
This standard is applicable to the following materials: Not applicable to: cold-running materials: 2 reference standards
H3170 numerical specifications
JG 884 new falling hardness meter
3 unspoken and defined
3.1 hardness
GD/T5766-1996
1:11 57-
The current pressure is adjusted to the pressure, and the surface of the powder is tested under the condition of heat. Then the main test force is removed to ensure the test force before the test. The depth of the ball is the residual increment under the initial test force, and the purchase situation is sought. Unit
Rockwell hardness H ratio = 130
3.2 standard piece
small Rockwell hardness scrap steel light and some force period of the combination of parts number. Element table 1. Initial test force
4 test environment
main test force
total
Wu test 2 (, the bearing of the degree of
5 test receiver
5. 1 Rockwell design
State Technical Supervision Bureau 1996-05-27 approved example ball blood color mn
1%, 2-m
1996-12-1 implementation
GB/T576E199E
fall [lack of craftsmanship design etc. [834 standard is, and according to the use of the rate of reliance, with the corresponding coordinates of the ball non-block selection for rescue. 5.21 thank the device
work in the drying machine to release the color change ratio of the rubber.
joint rolling material products selected H relative pressure control Kang two tight cost preparation: E sample preparation
1 test force peak test material will be made or the production test to provide a large heart and effect of the party sure, the test table without distinction have an impact on the verification of the current defects
6.2 decision thickness to ensure that the test does not continue to press the assembly of the simple production heart crack teaching or surface shape, 5.3 times the car market: should be placed in the case of more than 31. 7 test 7.1 Preparation before test 1.1.1 Select the appropriate standard of hardness of the material, and the hardness should be 13HR. 7.1.2 The tester should be placed on a horizontal platform, and the pressure head should be used directly. The steel ball can move in the hole of the tester. The steel ball should be clean and the weight should be reduced. 7.3 The seat and the test bench should be close to each other, and the support surface should be in accordance with the test conditions. If the support surface is not in accordance with the test conditions, the pressure head should be different. 7.1. Before changing the ball, the support must be moved. The same tester should be selected for each hardness test twice. 7.2 Method of measuring points in succession 7.2.1 The test points are not required. They should be distributed throughout the entire sample surface. The holes and 7.2.2 To the point of closing the magnetic indentation piece grid open sea test edge (guest bucket pull) is not less than 2. 7.2.3 The shadow rubbed out the center of the surface can be measured, reduced by the supply and demand parties, 7.3 Test operation
7.3.1 According to the size of the test shape, select the test odd and the account, .3.2 will be selected without impact with the steel foam pressure head contact. Add the initial test force. When using the dial tonnage meter, the short pointer of the double hardness book is smart at the small red dot, and the long pointer is turned three or two hands. The change point of the disk is 1130), and the pain is more than 10 5 points (if it exceeds this range, the material should not be read and the measurement point should be changed. Then adjust the indicator outer groove length to align with B.
13.32~16 Apply the test force. From the test will be good to protect the situation 7.3. 1 year 2 in the middle of the stable place to ask the original position engineer to remove the test force. 3.5 when the pre-test small test still holds 55, that is, the second straight core flow is used to reduce the hardness value to a test small 7.3.6 central change to the fixed point 7.3.2 ~ .3.5 case repeat dyeing 9 result expression and calculation
3.1 Rockwell type use variable value and grade word selection % scale table Ting, example: Sichuan IRM minus M standard ice people now standard is 38.? Effective Chi can be sold hardness. For the hardness meter. The test force is held for a long time. The number of times the test force card is eliminated by the number of times the plate point 0 is reduced by the public grade test force card. According to the method to read: forbidden number special. The scale reading is the convenient value
teaching is 1, the scale reading is the accurate value:
GB/T5766
and teach people! The standard length is reduced to the hardness value, and the test result is expressed as the average value of each measurement value. And it is rounded to an integer according to GB870. B.4 Standard error calculation formula: E(X, X)2 Where: 3-standard error compensation coupon: X,--each hardness position before positioning X--a set of hardness measurement arithmetic and value: 1--negative determination number. 9 Test report The acceptance report of the material hardness test should include the following contents: let this standard: material name, size specification and meter source; test ring tracking and test block state adjustment status: hardness test results and bad error; test period and test personnel: common pool, if the parties to the wide range of other matters.
Additional instructions,
The standard was drafted by the National Bureau of Thermal Power Materials and the technical personnel of the Kangzhou Brake Material Factory. This standard was drafted by Kangzhou Brake Material Factory and Nanjing Haifan Material Factory. The main drafters of this standard are Jiang Shizhao, Degongchen, Hui Laiyun and Wang Jinding. This standard refers to JISD1421-1937 (92 Automobile Brake Pad, Gasket and Clutch Pad Carbon Material Test Method. This standard was first issued in January 1586.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.