JB/T 7862.2—2001 This standard is a revision of JB/T 7862.2—1995 “Moving blades, fixed blades and cutter bars of agricultural machinery cutters”. The main technical content changes are as follows: ——Added fixed blade beam and adjusted the type of cutter; ——Adjusted the technical requirements, inspection rules and other contents. This standard specifies the main structural features, technical requirements, inspection rules and marking, packaging, transportation and storage of moving blades, fixed blades and cutter bars of agricultural machinery cutters. This standard is applicable to moving blades, fixed blades and cutter bars of agricultural machinery cutters. The previous versions of the standards replaced by this standard are: ——NJ 10—63, GB 1211—75, GB 1211—86, JB/T 7862.2—95; ——NJ 206—80, GB 1211—86, JB/T 7862.2—95. JB/T 7862.2-2001 Moving blades, fixed blades and cutter bars of agricultural machinery cutters JB/T7862.2-2001 Standard download decompression password: www.bzxz.net

ICS 65. 060. 50
Machinery Industry Standard of the People's Republic of China
JB/T7862.2-2001bzxZ.net
Cutter
Agricultural Machinery
Knife sections, ledger pates and knife backs of cutter bars for agricultural machinery2001-09-03 Issued
China Machinery Industry Federation
Implementation on 2001-12-01
JB/T7862.2-2001
This standard is a revision of JB/T78622-1995 "Power sections, fixed sections and force bars of cutter bars for agricultural machinery". Compared with JB/T7862.2-1995, the main technical content of this standard has been changed as follows: 1. V-type moving blades, II-type fixed blades and fixed blade beams of VI-type cutters have been added, and the II-type blade bar originally applicable to IV-type cutters has been adjusted to be applicable to VI-type cutters;
2. The technical requirements, inspection rules, and contents of marking, packaging, transportation and storage have been adjusted. This standard replaces JB/T78622-1995 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Agricultural Machinery Standardization. The responsible drafting units of this standard are: China Agricultural Mechanization Science Research Institute, China Harvest Corporation, Shandong Liangshan Machinery General Factory. The main drafters of this standard are: Zhou Chunlin, Li Zhiqing, Wu Junfeng, Fan Xiangjun, Li Jikuan. This standard replaces the following versions: -N10-1963, GB1211-1975, GB1211-1986, JB/T78622-1995; -NI206-1980, GB1211-1986, JB/T7862.2-1995. 1 Scope
Machinery Industry Standards of the People's Republic of China
Agricultural Machinery
|Knife sections, ledger plates and knife backs for cutter bars agriculturalmadhineryJB/T7862.2—2001
Replaces JB/T7862.2—1995
This standard specifies the main structural features, technical requirements, inspection rules, marking, packaging, transportation and storage of the moving blades, fixed blades and cutter bars (hereinafter referred to as moving blades, fixed blades and cutter bars) of agricultural machinery cutters. This standard applies to the moving blades, fixed blades and cutter bars of agricultural machinery cutters. 2 Reference 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/T 699—1999
GB/T 1298—1986
GB/T 2828—1987
3 Types and basic dimensions
3.1 Moving blades
High-quality carbon structural steel
Technical conditions for carbon tool steel
Batch-by-batch inspection counting sampling procedures and sampling tables (applicable to inspection of continuous batches) 3.1.1 Moving blades are divided into two categories according to the form of the cutting edge: smooth blades and toothed blades, and are divided into five types according to their dimensions: Type I: applicable to type I, II I, and IV cutters; Type II: applicable to type IV cutters; Type II: applicable to type II and V cutters; Type IV: applicable to type IV cutters; Type V: applicable to type VI cutters.
2 The basic types and dimensions of moving blades shall comply with the provisions of Figure 1 and Table 1. 3.1.2
Approved by China Machinery Industry Federation on September 3, 2001, implemented on December 1, 2001
Fixed blade
65± 05
51±015
2± 01
3.2.1Fixed blades are divided into three types:
Type I: Applicable to Type I cutters;
7862.2—2001
Figure 1 Moving blade
Type I: Applicable to Type II, IIII, and V cutters: Type IⅡI: Applicable to Type VI cutters.
3.2.2The basic dimensions of the fixed blades shall comply with the requirements of Figures 2 to 4. 2
65±05
11± 2
10± 2
JB/T7862.2—2001
Type I fixed blade
Figure 3Type II fixed blade
3.3 Cutter bar type
JB/T7862.2-2001
Figure 4Type I fixed blade
The knife bar is divided into two types: 1 and IⅡ. The dimensions shall comply with the requirements of Figure 5 and Table 2. Type I: Applicable to I, IIII, II, IV and V type cutters; Type II: Applicable to VI type cutters.
(r-1)x76.2
Note: n is the number of moving blades
3.4 ​​Fixed blade beam
5.5±0.15
5.5±0.15
Figure 5 Knife rod
2m5.540.3
The fixed blade beam is suitable for Type VI cutter, and its size should comply with the requirements of Figure 6. 4
3.5 Marking example
Type 1 smooth edge moving blade:
Moving blade IGJB/T78622—2001
Type 1 toothed edge moving blade:
Moving blade
Type I fixed blade:
JB/T7862.2—2001
Fixed blade I
JB/7862.2—2001
Type I tool rod:
JB/T7862.2—2001
Fixed tool beam JB/T7862.2—2001
Note: The subscript G indicates smooth edge.
4 Technical requirements
7862.2-2001
Figure 6 Fixed blade beam
4.1 The moving blade, fixed blade and blade bar shall comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 4.2 The moving blade shall be made of T9 steel specified in GB/T1298 or other materials with mechanical properties not lower than T9 steel. The fixed blade shall be made of T9, 45, 20 and 15 steel specified in GB/T1298 and GB/T699. The blade bar shall be made of 35 steel specified in GB699. The fixed blade beam shall be made of Q235 steel specified in GB/T700. 4.3 Hardness of quenching zone: 50~60HRC for smooth blade moving and fixed blades, 48~58HRC for toothed blade moving and fixed blades; the hardness of non-quenching zone shall not exceed 35HRC.
4.4 After quenching, within the range of 10mm from the working surface of the moving blade to the edge and 3mm from the working surface of the fixed blade to the edge, a decarburized layer not exceeding one-third of the total length of the cutting edge is allowed without reducing the hardness value. 4.5 The hardness measurement points in the quenching zone and non-quenching zone shall comply with the provisions of Figure 7. 5
【Type fixed force piece
JB/T7862.2—2001
『,Ⅱ,Ⅲ and V type moving blades
V type moving blades
Quenching position: 2, 3, 4, 5 and 6 points; non-quenching position: 1, 7, 8 and 9 pointsJapanese type fixed blade
Ⅲ type fixed blade
Quenching position: 1, 2, 3, 4 and 5 points; non-quenching position: 6, 7 and 8 pointsFigure 7 Hardness measurement position
4.6 Basic geometric parameters of tooth pattern of upper toothed moving blade4.6.1 The basic geometric parameters of tooth pattern of I, Ⅱ, I and IV type upper toothed moving blades are recommended as follows: Tooth pitch = 1.7~2.Qmm
Blade angle ^ = 23~25°
Cutting residual angle β = 58°~60°|| tt||Tooth pattern angle = 0~7°
Tooth tip angle βi+β2=45~50°
4.6.2 The basic geometric parameters of the tooth pattern of the V-type upper toothed moving blade are recommended as follows: Tooth pitch = 1.7~2.Qmm
Blade angle 1 = 28%30°
Cutting residual angle β=58~60°
Tooth pattern angle = 0~7°
Tooth tip angle β,+β,=45~50°
JB/T7862.2—2001
Note: Tooth depth S has two types: equal depth and semi-equal depth. The moving blade equipped with a V-type cutter can use semi-equal depth teeth. 4.7 The cutting edges of the moving and fixed blades should be sharp. The cutting edge thickness of the smooth blade should not exceed Q1mm; the cutting edge thickness of the toothed blade should not exceed 0.15mm
4.8 The toothed blade should be smooth and free of burrs, and no more than two missing teeth or bent teeth are allowed on one side of the blade. 4.9 There should be no defects such as burns and pitting within 10mm from the edge of the blade. 4.10 The movable and fixed blades should be treated with rust prevention. 5 Inspection rules
5.1 Factory inspection
5.1.1 Inspection items and indicators are determined in accordance with the technical requirements, product drawings or order contracts specified in this standard. 5.1.2 The movable and fixed blades, knife rods and fixed blade beams produced in batches shall be inspected and qualified, and accompanied by product certificates. 5.1.3 The movable and fixed blades, knife rods and fixed blade beams shall be submitted for acceptance in batches, and each batch shall be subjected to appearance inspection, and sampling inspection of dimensions, materials and mechanical properties shall be carried out in accordance with the provisions of GB/T2828. The specific inspection plan should be carried out according to the secondary normal inspection sampling plan specified in GB/T2828. The qualified quality level (AQL) of the moving and fixed blades is 2.5, and the qualified quality level (AQL) of the shank and fixed blade beam is 4.0. 5.2 Final inspection
The moving and fixed blades, shank and fixed blade beam shall be subject to final inspection by the quality inspection department of the manufacturer according to the order contract. 6 Marking, packaging, transportation and storage
6.1 The manufacturer's trademark and model shall be forged, cast or punched on the moving and fixed blades, shank and fixed blade beam. 6.2 When the moving and fixed blades are shipped separately, the weight of each package shall not exceed 50kg. The shank and riveted cutting knife shall be packed with plywood to prevent damage during transportation.
6.3 The outside of the package should be marked with:
a) the name, model and quantity of the moving and fixed blades, blade rods and fixed blade beams; b) weight;
c) the name of the manufacturer;
d) product standard number;
e) factory number and factory date;
f) storage and transportation mark.
6.4 The manufacturer's quality inspection certificate should be attached to the package. 6.5 Measures should be taken to prevent loss or damage due to vibration and bumps during transportation and loading and unloading. 6.6
Measures should be taken to prevent rust and damage during storage. 7
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