JB/T 3812-1999 JB/T 3812-1999 Disc springs for disc brakes of mine hoists and mine winches JB/T3812-1999 Standard download decompression password: www.bzxz.net

ICS73.100.40
Machinery Industry Standard of the People's Republic of China
JB/T3812—1999
Cup spring for minehoistand
minewinderdiscbrakes
Published on 1999-06-28
State Machinery Industry Bureau
Implementation on 2000-01-01
JB/T3812—1999
This standard is a revision of JB381284 "Cup spring for minehoist and minewinderdiscbrake". Compared with JB3812-84, the main technical content of this standard has been changed as follows: the requirements for the surface roughness of disc springs have been changed according to the use conditions: the relevant content that special requirements should be agreed upon by the supply and demand parties has been added; the use requirements and Appendix A have been cancelled, and the relevant content of Appendix B has been modified. From the date of implementation, this standard replaces Appendix A of JB3812-84 as the standard appendix.
This standard is proposed and managed by the National Technical Committee for Standardization of Mining Machinery. The responsible drafting unit of this standard: CITIC Heavy Machinery Company. The main drafters of this standard: Hong Hong, Du Bo, Wang Bing, Liu Fang, Guo Ming. 1 Scope
Machinery Industry Standard of the People's Republic of China
Mine Hoist and Mine Winch
Cup Spring for Disc Brake
Mine Winder Disc Brakes
JB/T3812-—1999
Replaces JB3812—84
This standard specifies the type, basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of disc springs for mine hoist and mine winch disc brakes. This standard applies to disc springs (hereinafter referred to as disc springs) used in mine hoist and mine winch disc brakes. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard by reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB191—1990
GB/T 2241987
GB/T2301991
Packaging, storage and transportation pictorial marking
Method for determining the depth of decarburized layer of steel
Metal Rockwell hardness test method
GB/T1222—1984 Spring steel
GB/T32791989 Spring hot-rolled thin steel plate
YB/T5058-1993 Spring steel, tool steel cold-rolled steel strip 3 Types and basic parameters
The type of disc spring is shown in Figure 1.
Approved by the State Machinery Industry Bureau on June 28, 1999 and implemented on January 1, 2000
JB/T3812—1999
The code and unit of the basic parameters of disc spring are shown in Table 1. Table 1
Basic parameter name
Arc radius
Free height of disc spring
Calculated value of deformation of disc spring when flattened (ho-Ho-t)Working load of disc spring
Working limit load of disc spring
Deformation of disc spring under working limit load
Calculated stress at position II of disc spring
Basic parameters of disc spring are determined according to Dd~1.8 and ho/t~0.4. Its basic parameters should comply with the provisions of Table 2. Marking:
Thickness of disc spring, mm
Outer diameter of disc spring, mm
Disc spring for disc brake
5 Marking example:
Disc spring for disc brake of mine hoist and mine winch with outer diameter D of 140mm and thickness t of 8mm is indicated as disc spring P140×8
4 Technical requirements
4.1 The finished disc spring shall meet the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. 4.2 The disc spring material shall be made of 60Si2MnA or 50CrVA strip plate or forged material (forging ratio shall not be less than 2) specified in YB/T5058 and GB/T3279.
4.3 The chemical composition, mechanical properties and other requirements of the disc spring material shall meet the requirements of GB/T1222. It must have the quality certificate of the manufacturer and can only be used after passing the re-inspection by the disc spring manufacturer. 4.4 The taper of the disc spring and the round roughness before pressing into the taper shall not be made by bar material. 2
Note: The deviation of production is limited to the design and manufacturing of samples. 4.5
The heat treatment hardness of the disc spring is 43~50HRC, thicknessbzxZ.net
Deepness of single-sided decarburization layer
JB/T3812-1999
Nominal limit
Dimension deviation
Strong pressure treatment load single piece weight
Quenching times shall not exceed twice, and the depth of surface decarburization layer shall comply with the provisions of Table 3. Table 3
≤0018t
The disc spring surface is not allowed to have scars, cracks, folds, rust spots and bumps. The surface roughness of the disc spring shall comply with the provisions of Table 4. Table 4
Processing method
Turning
Grinding
Note: Surface roughness refers to the surface roughness of the disc spring ring material before heating. The limit deviation of the disc spring size shall comply with the provisions of Table 2. 4.7
4.8 The fluctuation range of the disc spring load shall comply with the provisions of Table 5. Surface roughness R value
JB/T3812—1999
The geometric tolerance of the disc spring shall comply with the provisions of Table 6. Table 6
Name of geometric tolerance
Coaxiality of D to d
Gap between support surface and inspection platform
Parallelism between two support lines
(Test length Ld)
Fluctuation range of load (P)
Outer diameter D is 90-120mm
Outer diameter D>20-150mm
Outer diameter D is 90-20mm
Outer diameter D> 120-150mm
Inner diameter d is 40-63mm
Inner diameter 63~80mm
4.10 After heat treatment, the inner cone surface of the disc spring should be shot peened. After shot peening, the pit coverage rate of the inner cone surface should not be less than 90%. 4.11: After shot peening, all disc springs are subjected to strong pressure treatment. The strong pressure treatment load is in accordance with the provisions of Table 2. The number of strong pressure treatments is not less than five times. After treatment, its free height H should meet the provisions of Table 2. 4.12 The fatigue life of the disc spring should not be less than 5×105 cycles. 4.13 The anti-corrosion treatment of the disc spring surface should be bluing or phosphating. 5 Test method
The hardness of the disc spring shall be tested in accordance with the provisions of GB/T230. The depth of the decarburized layer of the disc spring shall be inspected in accordance with the provisions of GB/T224. The finished disc spring shall be subjected to compression test in single piece or in groups (using mandrel) according to the strong pressure load and number specified in 4.12. 5.4 Load test
a) The disc spring shall be subjected to load test after compression test. The disc spring load test must be carried out under loading condition, and lubricant shall be used during the test. The hardness of the pressure plates at both ends shall not be less than 55HRC, and the surface roughness R value shall be less than 1.6m. The upper pressure plate shall be equipped with a spherical device that can automatically adjust the level:
b) The disc spring shall be mounted on the mandrel in single piece or in groups and placed on the center of the platform of the force testing machine for testing. The load accuracy error of the testing machine shall not exceed ±1%
5.5 Dimension inspection
a) The free height shall be measured on the inspection platform with a depth caliper at three points of different parts of the disc spring after the compression test, and the average value shall be taken:
b) The inner and outer diameters are coaxial The degree of parallelism between the two support lines should be measured on the inspection platform with a measuring stand with an indicator. The upper plane of the disc spring should be measured, and the difference between the maximum and minimum free heights should be taken:
The inner and outer diameters of the disc spring are measured with a corresponding vernier caliper with an accuracy of 0.02mm: The arc radius of the F disc spring is measured with a special template. 5.6 The surface roughness is inspected by comparison or direct measurement. 5.7 The appearance is visually inspected or inspected with a 3x magnifying glass. If there is any doubt, it can be inspected by magnetic particle inspection or dye inspection. 5.8 The surface anti-corrosion treatment shall be inspected in accordance with the relevant bluing and phosphating standards. Inspection rules
The finished disc spring shall be inspected and qualified by the technical inspection department of the manufacturer before it can be shipped out of the factory. Inspection and test items of disc spring:
a) Appearance:
b) Hardness;
c) Dimensions and geometric tolerances of each part;
d) Load;
e) Surface treatment quality.
6.3 The inspection shall be carried out in accordance with the items specified in 6.2. The number of random inspections of the product batch shall be 5%~10% of the total number of the batch, but the number of inspections each time shall not be less than five pieces and not more than 100 pieces. If one piece (or group) fails in the random inspection, the product batch shall be sorted or repaired before being submitted for inspection.
6.4 If there are special requirements for inspection methods and inspection rules, they can be negotiated and stipulated by the supply and demand parties. 7 Marking, packaging, transportation and storage
Disc springs should be cleaned and coated with anti-rust oil before packaging. 7.1
2 Disc springs should be packed reliably, and the weight of each box should not exceed 60kg. 7.2
7.3 The packing box should be accompanied by a product certificate, which includes the following: a) Manufacturer name;
b) Product name and mark;
c) Number of pieces:
d) Manufacturing date;
e) Signature and seal of the technical inspection department.
7.4 The outside of the packaging box should be marked with:
a) manufacturer's name, trademark and address;
b) product name and mark:
c) consignee and address:
d) number of pieces:
e) gross weight;
f) "handle with care", "keep away from moisture" and other marks; g) date of manufacture.
JB/T3812-1999
5 The product should be stored in a ventilated and dry warehouse. Under normal circumstances, it should not rust within 18 months from the date of manufacture. 7.5
5 If there are special requirements for marking, packaging, transportation and storage, they should be agreed upon by both the supplier and the buyer. 7.6
JB/T3812-1999
Appendix A
(Appendix of the standard)
Disc spring guide
Disc springs are guided by guide rods, and the gap between the guide and the disc spring shall comply with the provisions of Table A1. Table Al
Disc spring inner diameter d
>30-50
>50-80
The minimum hardness of the guide surface of the guide should not be less than 55HRC, and the roughness R value of the guide surface should be less than 3.2um. A2
Mechanical Industry Standard
Mine Hoist and Mining Winch
Disc Spring for Disc Brake
JB/T3812—1999
Published by the Machinery Standardization Research Institute of the Ministry of Machinery Industry Printed by the Machinery Standardization Research Institute of the Ministry of Machinery Industry (No. 2 Shouti South Road, Beijing, Postal Code 100044)*
1/16 Printing Sheet 3/4 Word Count 16.000
Format 880×1230
First Edition in July 1999
First Printing in July 1999
Print Quantity 1-500
Price 1000 Yuan
99-149
66682
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