JB/T 9997-1999 This standard is a revision of ZB J41 014-89 "55° cylindrical pipe thread round die". During the revision, the hardness value of the round die was adjusted, and the provisions for the sample size of the tool and the evaluation conclusion of the test results were added. Editorial modifications were made in accordance with relevant regulations, and other technical contents remained unchanged. The original standard non-equivalently adopted the international standard ISO 4231-1987 "Hand and machine round die for cylindrical pipe thread G series". This standard specifies the type and size, technical requirements, performance test and basic requirements for marking and packaging of 55° cylindrical pipe thread round die (hereinafter referred to as round die). This standard is applicable to the processing of non-threaded sealed pipe threads (according to GB/T 7307-1987 "Non-threaded sealed pipe threads") G series A and B grade precision round die. This standard was first published on the date of the year. JB/T 9997-1999 55° cylindrical pipe thread round die JB/T9997-1999 standard download decompression password: www.bzxz.net

IC5 25.100.50
Mechanical Industry Standard of the People's Republic of China
JB/T9997—1999
55° Cylindrical Pipe Thread Round Die
1999-05-2( Issued by the State Machinery Industry Bureau on January 1, 2000. Implemented by JB/T9007-1999 on July 14, 2007. This standard is a revision of the 141011-89 "55° round tube thread die". During the revision, the value of the return plate was adjusted, the provisions on the tool holding capacity and the evaluation conclusion of the previous test results were added, and the modification was carried out in accordance with relevant regulations. Other technical contents have not changed. From the date of implementation, this standard will replace BJ41014-8, which was proposed by the National Tool Standardization Technical Committee. The responsible unit of this standard is the Ministry of Tools Research Institute. The main drafters of this standard are Jiang Tiguan, Zheng Baoan, Xue Xueguang, Guan Waiying, and Ji Qian. Scope of the People's Republic of China Machinery Industry Standards. 55° cylindrical tube thread round die. ||JB/T9997--[999
代警71414101484
This standard specifies the types and dimensions, technical requirements, performance test double marking and packaging requirements of 55-cylindrical tube screw thread (hereinafter referred to as mesh thread!).
The standard is applicable to the processing of non-threaded sealed sound thread (GB/T73U7-1987 non-net-threaded sealed general screw effect) G series and B grade precision bottom drawing thread.
2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through their use in this standard. When this standard is published, the version of the teeth shown is the right effect. All standards will be revised. The service party using this standard should explore the possibility of using the latest version of the following standards. GB/T7307-1987 Non-threaded sealed screen thread 3 Types and dimensions
3. 1[The type of side plate is as shown in [, and the size is shown in Table 1.AA
Approved by the National Machinery Industry Bureau on May 20, 1999, and implemented on January 1, 2000
Basic diameter
33 249www.bzxz.net
Note: The hole effect is determined by the manufacturer. JB/T9997-1999
The thread part is as shown in Figure 2, and the size is shown in Table 2. 3.2
Design: The thread is for reference.
3.3 Marking example
The pipe thread, code, and A-level precision are marked as: 2
2.0P-2.1P
JB/T 9997-[999
53 Circular dies for threaded steel pipes, GAJB/T999-159V pipe threads, code G and B, grade B, marked as: 55 Circular dies for threaded steel pipes, GB: 9997-19994 Technical requirements
4, 1 The surface of the teeth shall not have defects such as cracks, chipping, rust and burns that affect the performance. 4.1: The surface of the teeth shall be in accordance with the following provisions: External and end faces:
Standard surface:
Cutting front and back:
R, 1.6μm;
R12.5μm;
4.3 The dimensional tolerance of the outer diameter D of the dies is (10, and the thickness E is JS12. 4.4 The position tolerance of the dies is shown in Table 3.
G%-G2 years
When the screw axis is facing the outside, the direction of the screw axis is the same
, and the belt surface facing the effective axis can be moved
. The inclined surface of the screw axis can be cut
.
4.5 The screw teeth are made of 9SiCr or alloy tool steel with equivalent performance or above: the hardness of the screw part is not less than 60HRC. The screw teeth can also be made of high-grade tool steel if required, and the hardness of the effective part is not less than 62HRC. 5 Performance test
5.1 For batch production of screw teeth, each batch should be tested for performance before cutting. 5.2 Test parts
5.2. Machine tool: Machine tool that meets the requirements of the hardness. 52.2 Tool: Sample size is 5 pieces
5.2.3 Test: Material 45 steel, hardness range 170~200H: 5.2.4 Cutting: Emulsified oil and water filter, flow rate should be not less than 5L/min Cutting specification: See Table 4.
5.3 Evaluation of test results
Front speed
Total length
The mesh teeth after the test shall not have any scratches or obvious wear, and maintain its performance. The thread accuracy of the test teeth shall meet the thread length and thread stability R marked on the mesh teeth, ≤25=m. If one piece does not meet the above requirements, the batch will be judged as unqualified.
Marking and packaging
6. Marking
1. The product should be marked with:
a) Manufacturer or distributor's trademark:
b) Explosion code (accuracy;
JR/T 9997-1999
) Material code (the plate teeth made of high-speed tool steel are marked as HS5, and the plates made of alloy tool steel such as 9SiCr may not be marked
6.1.2 The packaging should be marked with:
) Manufacturer or distributor's name, address, trademark:
b) Plate teeth mark:
c) Material code or brand;
d) Property number;
) Year and month of manufacture.
6.1 Packaging
Plate teeth should be rust-treated before packaging. The packaging must be strong and can prevent minor damage during transportation.
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.