JB/T 7950-1999 JB/T 7950-1999 Quick Cutting Nozzle JB/T7950-1999 Standard download decompression password: www.bzxz.net

JB/T7950-
—1999
This standard is a revision of JB/T7950—95 "Quick Cutting Nozzle". This standard replaces JB/T7950-95 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Welding Standardization. The drafting unit of this standard: Harbin Welding Research Institute. The main drafters of this standard: Lv Zhenjie, Wang Run, Liu Hongge. 603
］Scope
Machinery Industry Standard of the People's Republic of China
Quick Cutting Nozzle
Nozzle for high-speed flame cuttingJB/T 7950--1999
Replaces JB/T7950—95
This standard specifies the model marking method, technical requirements, inspection method and marking of various specifications and varieties of quick cutting nozzles. This standard applies to fast cutting nozzles for flame cutting machines and manual cutting torches, and can be used in conjunction with the cutting torches specified in JB/T7947 and JB/T6970.
2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest version of the following references. GB/T2828-1987 Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection) JB/T6970-1993
Injection and suction cutting torch
JB/T7947-1999 Isobaric welding torch, cutting torch 3 Specifications and models
3.1 Specifications
The specifications of fast cutting nozzles are determined by the throat diameter of the cutting nozzle cutting the oxygen channel. The specifications and corresponding throat diameters are shown in Table 1. Table 1 Cutting nozzle specification and corresponding throat diameter Cutting nozzle specification
Throat diameter d
3.2 Model
3.2.1 Fast cutting nozzles are manufactured by electroforming and machining, respectively represented by GK and GKJ6
3.2.2 The cutting oxygen pressure of fast cutting nozzles is divided into 0.7MPa and 0.5MPa. 0.7MPa is not marked, and 0.5MPa is marked by code A.
3.2.3 Fast cutting nozzles are divided into 4 varieties according to gas and tail cone angle, and their codes are as follows: 1
-30° tail cone acetylene cutting nozzle;
2--45° tail cone acetylene cutting nozzle
-30° tail cone liquefied petroleum gas cutting nozzle
4-45° tail cone liquefied petroleum gas cutting nozzle. 3.2.4 Model designation
Guohao Machinery Industry Bureau approved 604 on 1999-06-24
2000-01-01 buy bottle
JB/T7950—1999
Cutting oxygen pressure code
Specification code
Variety code
Manufacturing method code
Example 1: GK2-5 indicates that the No. 5 acetylene fast cutting nozzle is manufactured by electroforming, the cutting oxygen pressure is equal to 0.7MPa, the tail cone angle is 45°, and the cutting oxygen channel diameter d is equal to 1.5mm. Example 2: GKJ3-4A indicates that the No. 4 liquefied petroleum gas fast cutting nozzle is manufactured by machining, the cutting oxygen pressure is equal to 0.5MPa, the tail cone angle is 30°, and the cutting oxygen channel throat diameter d is equal to 1.25mm. See Table 2 for various specifications of fast cutting nozzle models. Various specifications and varieties of fast cutting nozzle models
Table 2:
Processing method
Electroforming
Processing method
Cutting oxygen pressure
Electric gas
Liquefied petroleum gas
Liquefied petroleum gas
Liquefied petroleum gas
Tail cone
GK1-1;GK1-2;GK1-3;GK1-4:
GK1-5; GK1-6;GK1-7
GK2-1;GK2-2;GK2-3;GK2-4#
GK2-5;GK2-6,GK2-7
GK3-1;GK3-2;GK3-3:GK3-4:
GK3-5;GK3-6;GK3-7
GK4-1;GK4-2;GK4-3;GK4-4
GK4-5;GK4-6:G K4-7 | | tt | 1A;GK3-2A;GK3-3A:GK3-4A
GK3-5A;GK3-6A; GK3-7A ||tt || t||GKJ2-1;GKJ2-2,GKJ2-3+GKJ2-41GKJ2-5+GKJ2-6 ;GKJ2-7
GKJ3-1+GKJ3-2+GKJ3-3+GKJ3-4,GKJ3-5GKJ3-6;GKJ3-7
GKJ4-1+GKJ4-2,GKJ4-3+GKJ4-4,GKJ4-5;GKJ4-6;GKJ4-7
GK J1-1A GKJ1-2A+GKJ1-3AGKJ1-4A,GKJ1-5A;GKJ1-6A:GKJ1-7A
GKJ2-1A;GKJ2-2AGKJ2-3A+GKJ2-4A:GKJ2-5A GKJ2-6A,GKJ2-7A
GKJ3-1A;GKJ3-2A;GKJ3-3A;GKJ3-4AGKJ3-5A;GKJ3-6A;GKJ3-7A
GKJ4-1A,GKJ4-2A+GKJ4-3A:GKJ4-4AGKJ4-5A:GKJ4-6A;GKJ4-7A
4 Technical requirements
JB/T 7950—1999
4.1 When the preheating flame is adjusted to the neutral flame, the flame shape should be symmetrical and the combustion should be stable. 4.2 Under the normal flame background, the cutting oxygen flow should be located in the center of the flame when visually observed, and should be straight, clear and powerful. Under the specified operating pressure, the visible cutting oxygen flow length should comply with the requirements of Table 3. Table 3 Visible cutting oxygen flow length
Auxiliary nozzle specification number
Visible cutting oxygen flow length
≥100
The cutting performance of the fast cutting nozzle shall comply with the provisions of Table 4. 3
≥120
Table 4 Fast cutting nozzle cutting performance
Specification number
Throat diameter
Cutting thickness
5～10
10～20
60~100
100～150
150~180
10～20
20～40
40～60
60~~100
Cutting speed
mm/min
75 0~600
600～450
450~380
380-320
320~250
250~160
160~130bzxz.net
560~450
450-340
340-250
250210
210～180
Gas pressure
The relevant interchangeable matching dimensions of No. 1 to 7 quick cutting nozzles shall comply with the requirements of Figures 1 and 2. 614
90(or 85)
Figure 130° tail cone cutting nozzle matching dimensions
≥150
Liquid petroleum gas
Incision width
JB/T7950-1999
R5(or 80)
Figure 245° tail cone cutting nozzle matching dimensions
4.5The coating thickness on the cutting oxygen channel profile of the GK type cutting nozzle shall not be less than 0.15mm. 5 Inspection method
5.1. Inspection of cutting oxygen flow
According to the gas pressure specified in Table 4, adjust to a neutral flame after ignition. After stable combustion for 1 minute, open all the cutting oxygen regulating valves, observe and measure the visible cutting oxygen flow length, and inspect the cutting nozzles one by one according to the provisions of Table 3. 5.2 Inspection of cutting performance
5.2.1 Determination of cutting speed
According to the provisions of Table 4, select a rolled steel plate of appropriate thickness with a length of 300mm and a carbon content not higher than 0.45%; the oxygen purity is not less than 99.5%, and use a linear cutting machine to perform vertical linear cutting on the surface of the steel plate. The measured cutting speed should comply with the provisions of Table 4. The sampling method for cutting inspection should comply with the provisions of GB/T2828. 5.2.2 Determination of incision width
Use the workpiece thickness of 5.2.1 and the measured cutting speed (qualified product) to cut an incision of 80m in length, but do not cut it off. After the workpiece cools down, use a caliper or plug gauge to measure the incision width. The value should comply with the provisions of Table 4. The sampling method of cutting nozzles is the same as that of 5.2.1. 5.3 Inspection of cutting oxygen channel outlets
5.3.1 Determination of nickel plating
The thickness of the nickel plating at the outlet is measured with a tool microscope. If the thickness measurement value is less than 0.15mm, it is a defective product. The sampling method is the same as that of 5.2.1.
5.3.2 Determination of outlet shape
Cutting nozzles with non-cylindrical or chamfered deformation at the outlet are considered defective products. 6 Marking
Each cutting nozzle should be marked with the model, manufacturer name or trademark. The position of each mark should be obvious and the handwriting should be clear. 607
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