JB/T 10003-1999 This standard is a revision of ZB J41 020-90 "1:50 Taper Hole Taper Shank Twist Drill". During the revision, the performance test chapter was deleted, and editorial changes were made in accordance with relevant regulations. Other technical contents remained unchanged. This standard specifies the type and size, technical requirements and basic requirements for marking and packaging of 1:50 Taper Hole Taper Shank Twist Drills. This standard is applicable to Taper Hole Taper Shank Twist Drills with a diameter of 12~30mm. This standard was first issued on 1:50 Taper Hole Taper Shank Twist Drill JB/T10003-1999 Standard download decompression password: www.bzxz.net

CS25.10036
Machinery Industry Standard of the People's Republic of China
JB/T10003-1999
1:50 Taper Hole Taper Shank Twist Drill
Published on 1999-05-20
National Bureau of Machinery Industry
Implemented on 2000-01-01
HrT10003-1999
This standard is a revision of J4#020.90≤1:50 Twist Drill. The performance test chapter has been deleted and the revision has been made according to the relevant provisions. Other technical contents have been changed. This standard shall replace J4#020-90 from the date of implementation. This standard is not a proposal of the National Technical Committee for Tool Standardization. The responsible parties of this standard are: the General Factory of Cutting Tools and its Research Institute. The main drafters of this standard are Hao Sheng and Fan Jin. Scope
Machinery Industry Standards of the People's Republic of China
1:50 taper hole taper shank twist drill
JB/T10003-199
141211
This standard specifies the type and size, technical requirements and marking, basic requirements for packaging of 1:50 taper hole taper shank twist drills with a diameter of [2-30mm]. Referenced Standards
The provisions contained in the following standards are incorporated into the text of this standard by reference in this standard. When the standard is published, the versions shown are valid. All standards are subject to revision. The parties using this standard should use the latest version of the state standard. GD/T [443-1996 Type and size of white clamp cone 3 for machine handles]: 50 hole twist drills are shown in the figure, and the dimensions are given in the table]. Approved by the State Machinery Industry Bureau on May 20, 1999, and implemented on January 1, 2000. T10003-1999 Note: The dimensions and tolerances of Morse's standard are in accordance with the provisions of B/143. 3.2 Example
The mark of 1:50 threaded twist drill with diameter of 12mm and length of 1=190mm is: 1:50 threaded twist drill 12×190JB/T10003-194 Technical requirements
English space
4.! The mouth of the twist drill should be sharp and free from defects such as edge, crack and cutting burn that affect the performance: The welding twist drill should not have sand holes and incomplete penetration at the welding shoe:
42 The surface accuracy of the twist drill shall be as specified in Table 2, and the position tolerance and edge chain tolerance of the thread drill shall be as specified in Table 3. 4.3
Diameter measurement of the working part to the axial load of the tree
Symmetry of the drill core to the T working part line
Cutting example edge to edge, the inclined runout of the working part of the cable 5100
Accuracy tolerance
1, > 240
> 12--16
Surface
>20-30
JR/T10003—1999
d.4 Twist drill [. The working part drill core increases: every 100mm length ratio is 2-2.2mm, 4.5 Twist drill is made of W6Mo5Cr4V2 or other high-speed steel with equivalent performance. The welding twist drill tree is made of 60 steel, 45 steel or other steel with equivalent performance.
4.6 Hardness range, crushing hardness and development hardness of the working part of the twist drill Working part crushing hardness range: the integral twist drill is at the length of four-fifths of the average length of the drill tip, and the welded twist drill is at the length of one-fifth of the length of the drill dust groove.
T Hardness of the working part: G3HRC:
b) Fan tail hardness: net 25HRG.
4.? Twist drills should be steam treated or other surface strengthening treatments. 5 Marking and packaging
5.1 Marking
5.1.1 The product shall be marked with:
a) Manufacturer's or seller's trademark
6) New flower drill diameter and working part length, cone chicken: c) High speed code (HSs)
5.1.2 The packaging shall be marked with:
a) Manufacturer's or seller's name, logo and trademark; b) Marks specified in this standard;
High speed tempering number or brand:
d) Number of pieces:www.bzxz.net
c) Year and month of manufacture.
Twist pins shall be treated with rust prevention before packaging. The packaging must be reliable and can prevent damage during transportation.
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