Some standard content:
1CS 25. 100. 50
Machinery Industry Standard of the People's Republic of China
JB/T8825.7—1998
Thread rolling cylidrical dies for whitworth threads1998-12-29 Issued
National Bureau of Machinery Industry
1999-07-01 Implementation
JE/TBB25.7—199B
This standard was first issued on December 29, 1998. Foreword
This standard was issued by the National Technical Committee for Standardization of Knife and its main drafting unit: Shanghai Standard Parts Tools! 、Shanghai Cutting Tool Factory I
1 Scope
Machinery Industry Standard of the People's Republic of China
Whitworth Thread Rolling Wheel
Thred roning cylimdricaldler far whiworthtrerdsJB/T8825.7-1998wwW.bzxz.Net
This standard specifies the type and size, technical requirements and marking, packaging, etc. of Whiworth thread rolling wheels (hereinafter referred to as thread rolling wheels).
This standard is applicable to the rolling wheels for processing Whiworth screw threads (BS-1955). Thread rolling wheels are divided into two grades of precision: grade 2 and grade 3. Grade 2 is suitable for processing medium-grade external threads, and grade 3 is suitable for processing free-grade external threads. 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in the standard. At the time of publication of this standard, the versions shown are valid. All standards are subject to revision, and the parties using this standard should explore the possibility of using the latest versions of the following standards. B584—1956 Whiworth tooth type round drawing
3 Types and sizes
3.1 Unique characteristics of thread rolling wheels in Table 1 and Table 1 Figure 1
Note: The threading wheel in the figure is divided into two types: with boss and without boss, which can be determined by the whole system. Table
54 Type
Inner hole D
National Machinery Industry Bureau 1998-12-29 approved b
47.919863
79.3*g.74
1999-07-01 implemented
JB/T 825.7-1998
The basic dimensions of the 45-type and 54-type dissolving wheels are shown in Tables 1, 2 and 3. Table 2
Each 25.4mm
Code
1/420BSW
516-18ES
3/8-16BSW
7/16-14BSW
12-12SW||tt| |9716-12S
3/4-10
1-8BSW
Screw effect code
1/4-26BSF
9/32-26BSF
5 doors 6-22BS
3/8-20SF
7/16-18HSF
1/2-16BSF
9/16-16 B5F
5/814BSF
11/16-14BSF
3/412BSF
7.8-I1BSF
+Number of teeth
Number of upper teeth
Nominal diameter
Diameter
Table 2, the ones in the table are recommended sizes.
Note wheel
Comparison
Screw head
Medium diameter d
143 962
144653
Medium diameter
138864
2" For special products, when the wire length specified in the solution cannot be used, the following width series can be selected: 45, 5 core, 55, 60, 65, 7075, 80, 55, 90, 95.100.105.
3 Manufactured according to the needs of the user factory and with various cut-offs. JB/T 8825.7—1998
The basic dimensions of the 3.375 type wheel are given in Tables 1, 4 and 5. Table 4
Thread code
1/2-12ARW
9/16-12 BSW
-11BSW
3/4-10BSW
1-8BSW
1%-7 BSW
L-7BSW
Frequency code
9/16-16BSF
S/B-14BSF
11/1614 DSF
3/412BSF
7.8-11RSE
1%-9BSF
1% -8 SF
1X-BESF
Upper thread
Number of upper threads
Nominal diameter
Number of nominal diameter
19,004
The recommended dimensions in the table are: Screw P
Pitch P
Screw wheel
Number of screw starts
Number of thread starts
Medium diameter
178849
Width
60, 70
70, 80
Height
50，60
2When using special grease, if the specified rolling width cannot be used, please select according to the following width series: 45，50，55，65，7075,80,85,90,95,100.105.
3We need to make the market have the production capacity and other gains. 3
J line 8825.7-1998
3.4 The dimensions and deviations of the tooth profiles of these rollers are given in Figure 2 and Table 6. A roller is preferred. Type A and B
Minimum deviation
Lower deviation
Lower deviation
Note: The maximum value of the tooth radius R is 0.[3P, and its range of variation depends on the actual size of the spoon: every 25.4 mm
state distance peak
± 35#
3.5 Marking example
JE/T8823.7-1998
Coarse-pitch Whitworth thread, thread code t/4-20BSW, 20 teeth per 25.4mm, width 50mm, grade 2 accuracy, explosive tooth type A, 54-type dense thread wheel:
Whitworth thread rolling wheel 54-type A1/4-20月5W50-2月8825.7—1998 Plastic-pitch Whitworth thread, thread code 1/2-12A SF, 12 teeth per 25.4mm, width 60mm, 3 precision, thread type A, 75 type thread rolling wheel:
Whitney mosquito dissolving thread wheel
75 type A1/2-12BSF60-3JB/T8825.7—19984 according to technical requirements
4.1 Dimension and position tolerances
4.1.1 The tolerances of inner hole, key block, middle diameter, pitch, tooth type half angle, tooth texture, tooth hemp height and other dimensions shall be in accordance with the provisions of the drawings and tables of this standard. 4.1.2 Other items are given in Table 7.
The difference between the major diameter and the middle diameter of the two wire wheels
The difference in rolling roughness
The surface linkage of the supporting surface to the axis
The degree of rotation is up to 50
Medium diameter and standard
4.2 Material and hardness
>50-80
45, 54
45 type, 54 type
75 type
45 type, 54 type
, 54 type
4.2.1 The wire wheels are made of 9siCr or Cr12MoV alloy or other alloys with equivalent performance. The internal roughness of the Crl2MoV film is not less than 3 satin,
4.1.2 The hardness of the working part of the thread rolling wheel is 59.5-62.5HRC. 4.3 Appearance and surface roughness
4.3.1 The surface of the thread rolling wheel shall not have cracks, notches, penetrations, burns and other defects that affect the performance. 4.3.1 The upper value of the surface roughness of the thread rolling wheel shall be in accordance with the following provisions: the inner surface of the thread tooth profile and the two supporting end faces
R,o.8 μm.
Marking and Packaging
51 The thread rolling wheel shall be marked with
) Manufacturer or seller’s trademark;
b) Cutting and processing code:
) Thread rolling wheel thread type (A or B):
d) Accuracy grade:
e) Manufacturing material;
f Each set of complete sets shall be numbered.
5.2 The packaging box shall be marked with
JBT8825.7—1998
) Manufacturer or seller’s name, address and trademark;
b) Thread rolling wheel mark;
c) Manufacturing material:
d) Year and month of manufacture.
3.3 Packaging
The thread rolling wheel shall be treated with disinfection before packaging. The packaging must be secure and can prevent insertion during transportation. 6
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.