This standard is applicable to the cupping test of nonferrous metal sheets and strips for deep drawing with a thickness of 0.10~3.00mm. GB/T 5125-1985 Nonferrous metal cupping test method GB/T5125-1985 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Method for deep drawing cups testingof non-ferrous metals
This standard applies to the deep drawing cups testing of non-ferrous metal sheets and strips with a thickness of 0.10 to 3.00 mm. Terminology and symbols
1.1 Terminology
1.1.1 Disc: a round blank or machined round test piece punched from a plate or strip. UDC 669.2/.8
620.178.7
GB5125--85
Blank holding force: a vertical pressure applied by the clamping device to the disc to prevent the disc from wrinkling due to the circumferential compressive stress. 1.1.2
Die clearance: half the difference between the inner diameter of the die and the diameter of the punch. 1.1.3
Ear: Symmetrical ear-shaped protrusions formed on the edge of a punched cup due to the anisotropy of rolled sheets and strips. 1.1.4
Ear peak height: The vertical distance from the ear peak to the outer surface of the cup bottom. Average ear peak height: The arithmetic mean of all ear peak heights. Ear valley height: The vertical distance from the valley between two adjacent ear peaks to the outer surface of the cup bottom. 1.1.7
1.1.8 Average ear valley height: The arithmetic mean of all ear valley heights. Average ear height: The difference between the average ear peak height and the average ear valley height. 1.1.9
Ear ratio: The percentage of the average ear height to the average ear valley height. 1.2 Symbols
For symbols, names and units, see Table 1, Figures 1 and 2. Table 1 Symbols, names and units
Published by the National Bureau of Standards on April 24, 1985
Whip thickness, i.e. nominal thickness of thin plates and strips; Wafer diameter
Punch diameter
Inner diameter of die
Punch corner radius
Die corner radius
Ear peak height
Ear valley height
Average ear bee height
Industry average ear valley height,
Average ear height, i.e., p
Ear rate, i.e., △
1986-02-01 implementation
Test principle
GB5125-85
The punch cup test is to press the disc sample of thin plate or strip between the blank holder and the die. Under the impact force applied by the punch, it will produce radial extension and bending plastic deformation and be drawn into a cylindrical cup at one time. It is used to measure the anisotropy of the material marked by the ear rate. The test is carried out at room temperature.
Clamping device
Figure 1 Punching tool for pressing disc specimen
Figure 2 Cup with four ears
3 Specimen
3.1 Strip or square specimen ring cut from plate or strip that has passed the appearance inspection should be flat3.2 When punching or machining disc specimens, cold working or heat effects that may change the properties of the material should be prevented. The cold work hardening edge formed when the specimen is prepared does not need to be removed. 3.3 The periphery of the punched disc should be free of burrs that affect the flatness. 3.4 The diameter of the disc specimen is 60-0.05~-0.20mm. If a 60mm disc breaks during drawing, a disc with a smaller diameter can be selected by agreement. 808
Testing equipment
GB5125—85wwW.bzxz.Net
The test can be carried out on a special cupping test machine or hydraulic test machine equipped with a punching tool. 4.1
4.2 Testing machine
4.2.1 The testing machine shall meet the following basic requirements: 4.2.1.1 It shall have a positioning device for adjusting the center position of the disc and enable the punch, die and disc to be placed concentrically. 4.2.1.2 It shall have a clamping device for applying and adjusting the blanking force and shall be equipped with a force measuring instrument, such as a pressure gauge. 4.2.1.3 It shall have a device for adjusting the drawing speed. 4.3 Cupping tool
4.3.1 The test die shall be as shown in Figure 1. It shall meet the following requirements: 4.3.1.1
The punch and die shall be polished and have a hardness of HRC58-60. 4.3.1.2 The radius transition of the punch and die shall be gentle and smooth. 4.3.2 The main dimensions of the punch and die are shown in Table 2. Table 2 Relationship between wafer thickness and punch diameter and die diameter Order
Whip thickness
0.10~0.11
0.12~0.14
0.15~0.17
0.18~0.20
0.21 ~0.24
0.25~0.29
0.30~0.35
0.36~0.40
0.41~0.45
0.46~0.50
0.51~0.60
0.61~0.70
0.71~0.80
1.01~1.20
1 .21~1.40
1.41~1.70
1.71~2.00
2.01~2.50
2.51~3.00
Punch size
Die size
Note: The die clearance range in the table is (1.25~1.62)0. If other clearances are required, they can be implemented according to the relevant technical conditions agreed upon by the supply and demand parties. 809
5 Test steps
GB5125-85
5.1 According to the thickness of the wafer, select the punch and die according to Table 2. 5.2 Install the punch and die. When using the punch cup tool on the additional hydraulic testing machine, it is necessary to adjust the punch and die before the test so that their axes coincide.
5.3 Apply a suitable lubricant to both surfaces of the disc, such as engine oil, industrial vaseline, etc. 5.4 Place the disc in the cup punching tool, aligning it with the punch and die without deviation. 5.5 Adjust the clamping device and apply appropriate pressure to the disc so that the disc will not have unstable wrinkles during drawing, and it is easy to punch and form without cracking.
5.6 Move the punch or die at a uniform drawing speed to punch out the cup. 5.7 Measure the H peak height and ear valley height of the cup, and the measurement accuracy should be not less than 0.05mm. 6
Result evaluation
6.1 Determination of ear rate
6.1.1 For cups with obvious ears, calculate the average ear peak height, average ear valley height and average ear height. 6.1.2 Calculate the ear rate e according to the formula provided in Table 1. 6.1.3
The calculated value of the earing rate e shall be rounded to an integer multiple of 0.1% according to Appendix C of GB1.1-81 "General Provisions for the Preparation of Standards in the Guidelines for Standardization Work".
6.2 If any of the following test conditions occurs, the test shall be invalid and a supplementary test shall be conducted: Wrinkles appear around the cup that affect the accurate determination of the earing rate; a,
b. The shape of the cup is obviously asymmetrical,
The disc is cracked and not finally formed.
Test report
The test report shall include the following main contents: a.
Material brand, state and product specifications (thickness); disc diameter,
Punch and die diameter:
Blanking force and drawing speed,
Lubricant type and name:
Measured value of earing rate, and indicate the orientation of earing relative to rolling direction when necessary, such as 0" and 90° or 45°. Additional remarks:
This standard was proposed by China Nonferrous Metals Corporation. This standard was drafted by Northeast Light Alloy Co., Ltd. and Luoyang Copper Co., Ltd. The main drafter of this standard was Chen Guangxian.
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