JB/T 7904-1999 This standard is a revision of JB/T 7904-95 "Carbide inserts for deep hole drilling with internal chip removal". During the revision, only editorial changes were made in accordance with relevant regulations, and the technical content remained unchanged. This standard specifies the model and representation rules, type and size, technical requirements, inspection rules and test methods, and basic requirements such as marking and packaging of carbide inserts for deep hole drilling with internal chip removal. This standard is applicable to carbide inserts for deep hole drilling with internal chip removal. This standard was first issued in 1983 as GB 3878-83 and was adjusted to JB/T 7904-95 in April 1996. JB/T 7904-1999 Carbide inserts for deep hole drilling with internal chip removal JB/T7904-1999 Standard download decompression password: www.bzxz.net

1CS 25.100.30
Machinery Industry Standard of the People's Republic of China
JB/T7904-1999
Carbide inserts for deep hole drilling with internal chip removal
Published on May 20, 1999
National Bureau of Machinery Industry
Implemented on January 1, 2000
JB/T7904-1999
This standard is a revision of JB/T7904-95 (formerly GB3878-83) "Carbide inserts for deep hole drilling with internal chip removal". During the revision, only editorial changes were made according to relevant regulations, and the technical content remained unchanged. This standard replaces JB/T7904-95 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Standardization of Knives. The responsible drafting units of this standard are: China Cemented Carbide Factory and Chengdu Tool Research Institute. The main drafters of this standard are Zhang Xingkui, Fan Tiezhen and Fan Jin. Scope
Mechanical Industry Standard of the People's Republic of China
Carbide Inserts for Deep Hole Drilling with Internal Chip Removal
JB/T 7904-1999
Replaces JB/T7904-95
This standard specifies the model and its representation rules, type and size, technical requirements, inspection rules and test methods, and basic requirements such as marking and packaging of carbide inserts for deep hole drilling with internal chip removal. This standard is applicable to carbide inserts for deep hole drilling with internal chip removal. 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 parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T2075-1998 Classification codes for the use of hard cutting materials for cutting machining, large groups of chip forms and application groups YS/T 79-1994
3 Models and their representation rules
3.1 Models
Carbide welding inserts
This standard includes inserts for the center teeth, middle teeth, outer teeth and guide blocks of deep hole drills with internal chip removal, which are represented by the following models: E10 type - represents the center teeth of deep hole drills with internal chip removal; E20 type -
E30 type -
- represents the middle teeth of deep hole drills with internal chip removal;- represents the outer teeth of deep hole drills with internal chip removal:
E40 type - represents the guide block of deep hole drills with internal chip removal. 3.2 Model representation rules
The model of the insert consists of letters and numbers arranged in a certain order and representing given meanings, and is divided into two parts: a) The first part uses the code specified in 3.1 to represent the name of the insert. b) The second part uses two digits to indicate the width of the blade. When the integer part of the nominal size of the blade width is less than two digits, add a "0\" before the unit digit.
3.3 Model Representation Rules Examplebzxz.net
indicates the width of the center tooth blade, 09 indicates 9mm for the center tooth
indicates the width of the outer tooth blade, 12 indicates 12mm for the outer tooth
Approved by the State Machinery Industry Bureau on May 20, 1999 and implemented on January 1, 2000
4 Type and Size
JB/T7904—1999
4.1 The type of carbide insert for E10 type internal chip removal deep hole drill with center tooth is shown in Figure 1, and the size is given in Table 1. E10 type
Nominal size
Applicable diameter range of deep hole drill with internal chip removal net
#20±24
>$24~$28.5
>28.5~33.5
>±33.5~±43
> Φ43~$51.5
>±51.5~±65
4.2 The carbide insert for E20 type internal chip removal deep hole drill with middle teeth is shown in Figure 2, and the dimensions are given in Table 2. E20 type
JB/T7904-1999
Nominal size
Applicable diameter range for assembly internal chip removal
deep hole drill
$20~±24
>$24-±28.5
>Φ28.5~33.5
>$33.5~@43
>$43~$51.5
>51.5~@65
External teeth E30 type internal chip removal The type of carbide insert for deep hole drilling with internal chip removal is shown in Figure 3, and the size is given in Table 3. 4.3
E30 type
E30010
Nominal size
Applicable assembly internal arrangement
True diameter model of deep hole drill
$20~$24
>±24~±28.5
>Φ28.5~$33.5
>±43~$51.5
Guide block E40 type internal chip removal deep hole drilling with carbide insert is shown in Figure 4, and the size is given in Table 4. mm
Technical requirements
JB/T7904—1999
E40 Type
Applicable for assembly of internal chip removal
True diameter range of deep hole drill
$20~$28.5
>$28.5~$33.5
> ±33.5~±51.5
>±51.5~$65
The brand and physical and mechanical properties of carbide inserts for manufacturing internal chip removal deep hole drills shall comply with the provisions of GB/T2075. 5.1
5.2 Dimensional deviations of various parts of the insert
5.2.1 The dimensional deviations of the width (A), thickness (C), length (L) of the insert are shown in Table 5. Table 5
Nominal dimensions
Higher grade
Ordinary grade
5.2.2 The dimensional deviations of the R, e, etc. of the insert are shown in Table 6. Nominal size
Allowable deviation
5.2.3The other technical requirements of the blade shall comply with the provisions of YS/T79. Inspection rules and test methods
The inspection rules and test piece method of the blade shall comply with the provisions of YS/T79. >6-12
>12-25
Marking and packaging
JB/T7904—1999
Marking and packaging shall comply with the provisions of YS/T79. The weight of each box of product packaging is about 1kg.
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