QB/T 2527-2001 General technical requirements for heat treatment of sewing machine parts
Some standard content:
Classification No. Y17
Observation No. 9491—2001
Light Industry Standard of the People's Republic of China
QB/T 2527—2001
Sewing machine parts
General technical conditions for heat treatment
2001-11-15 Issued
China Light Industry Federation
2002-05-01 Implementation
QB/T2527—2001
This standard is a revision of the professional standard ZBY17015-1985 "Technical conditions for heat treatment of chain sewing machine parts" issued by the former Ministry of Light Industry (this standard was issued by the Ministry of Light Industry [1999] No. 112 and converted to standard No. QBT35441999, the same as before).
This standard changes the main technical contents of the original standard. The terminology is added. In addition to the common terminology (annealing, normalizing), the terminology of new processes is added, and the definition of the depth of the iodine layer is revised:
The original "technical requirements" are reclassified, and the content of the certification is added:
- The relevant content of "part speed and part hardness value requirements" is expanded, and "the depth of the iodine layer of various different seasons" is added for reference - For the effective hardening product depth greater than 0.30mm and less than 0.30mm, the hardness test standards are respectively specified:
- Chapter 4 classification is added.
This standard was proposed by the Comprehensive Business Department of China Light Industry Joint Venture, and this standard will be issued under the jurisdiction of the National Machinery Standardization Center. This standard is drafted by: Shanghai Machinery Co., Ltd. Parts General Factory. Shanghai Sewing Machine Research Institute. The main drafters of this standard are Zhu Sai, Dong Xuejuan, and Zhang Weipan. From the date of implementation of this standard, the industry standard QBT3544-1999 "General Technical Conditions for Heat Treatment of Chain Sewing Machine Parts" issued by the former State Light Industry Association shall be corrected.
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1 Model
Light Industry Industry Standard of the People's Republic of China
Sewing Machine Parts
General Technical Conditions for Heat Treatment
QB/T2527-2001
Generation Q83544-1599
This standard specifies the technical requirements, test methods, inspection rules, etc. for heat treatment of shoe sewing machine parts. This standard is applicable to the heat treatment of sewing machine parts and metallurgical parts. 2. Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard by citing them in the text. When the standard is issued, the versions shown are all valid. All standards will be reviewed and parties using these standards should explore the possibility of using the latest versions of the following standards.
GB/T224-1987
Method for determination of the depth of delamination layer
GB/T230—1991
Metal hardness test method
GB/T231-1984Metal hardness test method GB/T1172-1999Metal hardness and hardness conversion value GB/T1818—1994
Metal surface hardness test method
GB/T 4340.1 —1999
Metal hardness test Part 1: Test method for determination of effective hardening layer depth after fire or flame ignition GB/T 5617-1985
GE:T9450-19S8
Steel parts can be measured and controlled by fire hardening layer depth GB/T 045I-[988
Parts surface total hardening layer depth or effective hardening layer depth determination GH/T11354-1989 Automobile iron parts sand oxygen depth section determination and metallographic structure inspection QCn29018 Automobile general emergency co-infiltration gear metallographic inspection JB4155-9 Gas parts hydrogen carbon final
JB/T9204-1990
Steel parts induction fire cabinet inspection
JB9211-1999 Medium carbon steel and medium carbon alloy structure period Ma Tianben grade QC door 262 Automobile latent carbon step metallographic inspection|| tt||YH/T514 1993 Gold plated product particle size determination method 3 Terminology
3.1 Effective hardened layer depth
The distance measured in the vertical direction from the surface of the component to the specified product micro-depth value; 3.2 Iron-iron carbon co-paint (bag widening)
It is a low-temperature chemical heat treatment method in which carbon atoms are simultaneously accumulated in the surface layer of the component between about 500℃ and 600℃; 3.3 Austenite nitrogen-carbon co-paint
It is a low-temperature chemical heat treatment method in which nitrogen atoms are accumulated in the surface layer of the component between about 600℃ and 700℃. Approved by China National Light Industry Council on July 16, 2001, implemented on November 1, 2001
4 Classification
/T 2527—2001
4.1 Classification of heat treatment technical conditions applicable to this standard 4.1.1 Annealing and normalizing
4.1.2 Selective annealing and storage annealing
4.1.3 Surface floating annealing
4.1.4 Push magnet annealing
4.1.5 Carbon spot floating annealing
4.1.6 Chlorocarbon dragon annealing
4.2 Examples
When using this standard, the heat treatment classification should be indicated. Example: "The heat treatment technical conditions apply to 5.4 Surface clean annealing\, 5 Technical requirements
5.1 General requirements for heat treatment production
5.1.1 The materials shall meet the requirements of the drawings and the provisions of the relevant national standards for the metallurgical industry. 5.1.2 The appearance shall meet the following requirements.
The finished parts shall not have cracks, folds, and defects such as oxide scale, looseness, slag holes, etc. that affect the quality of heat treatment: a. The surface after mechanical processing shall not be free of cracks, rust, serious magnetic damage, burrs, iron eyebrows, and defects that affect the quality of heat treatment:
The surface after mechanical processing shall not be free of cracks, rust, serious magnetic damage, burrs, iron eyebrows, and defects that affect the quality of heat treatment:
Or chamfer.
5.1.3 The hardness of the fast-grid parts that need heat treatment and strengthening shall not be less than 6.5cm5.1.4 The free net inlay of low carbon steel for cold punching and cold use shall be grade 2. 5.2 Annealing and normalizing
5.2.1 Applicable parts, rough parts that need to adjust the structure or improve the performance, such as compensation parts, forging parts, etc. 5.2.2 Appearance: The surface after treatment shall not be cracked or have defects. 5.2.3 Hardness: According to the material number, the specific hardness is shown in Table 1. Hardness ()
Q215. Q215(A3)
15Ct.20Cr、15CrMo,
20CrMo
[20--185
T9、110
CrWMn, GCr15
WGMo5Cr4V2
W9Mfo3CrV
Hardness (HB)
229~269
Year 250
5.2.4 Deformation: The deformation of the workpiece should not affect the machining and use after heat treatment; correction is allowed, and the residual stress generated by the correction should not affect the actual machining
5.2.5 Decarburization layer, less than two-thirds of the single-sided processing residual plate, does not affect the final heat treatment, 5.2.6 Metallographic structure
) Structural steel parts should be evenly distributed ferrite and lamellar pearlite and spherical spheroidal body: b) The grain change of the cladding steel should be 5~8 levels. YIKANKAA
5.3 Quenching and tempering
DB/T 2527-2001
6.3.1 Applicable parts: parts that need to be selected and quenched, such as spring parts, screws, etc. 5.3.2 Appearance: after treatment, there will be no defects such as oxidation, double grain, harmful flower effect, etc. that affect the performance of the machine. 5.3.3 Hardness, see Table 2.
Parts Category
Rotary Guide Sliding Parts
Overload Parts
Escape Classification
Turn High speed
High, super Di
Iron-based ferrous metallurgy (performance parts]
Ya Du (HV)
Zero category
Sulphur parts
Ten thousand pieces
One acid ridge
Thick plate mirror
Yifanyuan firmware
Important data firmware
Cut, knife
Quick seat (HV)
450± 4)
350~-500
5.3.4 Deformation: The deformation record shall comply with the requirements of the drawings or the technical specifications, and shall not affect the mechanical processing quality and performance of the parts. 5.3.5 Metallographic structure
Medium carbon steel or medium carbon alloy steel parts: martensite level ≤4 b) Carbon steel parts: martensite level ≤2. Bearing copper parts: martensite level 1~3. 5.3.6 Decarburization layer: The decarburization layer after treatment shall not affect the batching performance of the parts. 5.4 Surface Floating
5.4.1 Environmental parts: Applicable to parts for characterization or localization, such as toothed shafts, needles, etc. 5.4.2 Appearance: The parts shall not have defects such as cracks, corrosion and damage. 5.4.3 Hardness: The hardness of the parts after quenching shall not be less than the specified value. If there is no special provision, please refer to Table 2. Important deviation 1HV60 general parts deviation ≤80
5.4.4 The soft and non-hardened area shall be heated at a rate not exceeding 80% and shall comply with the provisions of Table 3. 5.4.5 Deformation: The deformation of the parts shall not affect the quality and performance of the subsequent machine. 5.4.6 Metallographic structure
When the hardness of the parts is ≥HV600: The structure shall be of grade 4 to grade 5; no more than 5% of the alloy is allowed, and no ferrous metal shall be allowed.
Metallurgical structure0.30mm parts: surface crack concentration 0.8%~~1.1% ≤. 0.30mm thin pressed parts, surface carbon concentration 0.6%~1.1% 5.5.4 Decarburized layer: after treatment, the surface crack concentration is not more than half of the total decarburized layer depth plus the remainder. 5.5.5 Plasticity: see Table 2.
and other categories
chip induction fire
stepped
shaft with hole
shaft with retracted tool
QB/T2527-2001
soft belt and non-hardened area width
tolerance of fire length ±4mm
technical area
the distance between non-hardened area and hole
the effective hardening depth of soft belt filled with
more than 5mm is shown in Table 4.
shaft. Balls
Axles, tower necks
0.05~(.15
014~·0.30
0.20~0,40
0.20~0.50
Board inflammation punching parts skin other
Deepness of corrosion layer
G 05 ~u.13
0.10~0.30
0.20~0.50
Note, the core material can refer to the shaft, but the degree of the alloying layer shall not exceed the original 12.2. The alloying layer of the bent needle is 0.1(mm~,30mm
5.5.7 Metallographic structure
Special screw
General screw
Step screw
Step screw
3/16 or more
Chemical product detection
0.G3-0 10
0.05~6 15
0.10~0.20
5.5.7.1 The metallographic structure after the cleaning part is filled (balanced state): pearlite + a small amount of hardened hook, the network carbide shall not exceed the tensile strength 4: the core grain skin 4 ~ 8 level. The single line shall be not less than 5 short. ) The surface martensite and residual austenite of the paint magnetic tempering are more than 4 levels. 6 screw lamps, noise mothers and unimportant carburized parts have a surface martensite and residual austenite of 6 levels after tempering. - TY KAbNBY KAca-
0B/T2527—2001
5.5.7.2 Net layer depth: (equilibrium state) Carbon steel is measured from the surface to the 1st position of the chain zone: Alloy hook is measured from the surface to the original structure, thin steel parts with a thickness of more than 0.30mm are measured from the surface to the original structure. 5.6 Carbon-nitrogen co-extrusion annealing
5.6.1 Applicable parts: Low-carbon steel and low-carbon alloy parts that need surface annealing, such as crankshafts, gears, and heavy shafts.
5.6.2, After annealing, the parts are free of cracks, peeling, corners and magnetic damage. , scale, rust, pitting, etc.
5.6.3 Surface concentration of decarburized layer
Shafts and bevel gears: Surface carbon concentration 0.7%~0.9%; For decarburized layer>0.30mm parts, surface concentration 0.8%~1.1%; oxygen concentration not less than 0.1%; For decarburized layer ≤0.30mm, surface carbon concentration 0.6%1.1%; hydrogen concentration not less than 0.1%. 5.5.4 Decarburized layer, after treatment, the surface carbon-poor layer of the part shall not exceed half of the total decarburized layer depth. 5.6.5 Degree of penetration: See Table 2.
5.6.6 Effective decarburization depth, See Table 4. 5. 6.7 Metallographic structure
5.6.7.1 Metallographic structure of melt after cooling (equilibrium state): molten metal + carbonitride; carbonitride shall not exceed Grade 4: core grain size Grade 4~8. Important parts shall not be less than Grade 5 a) Gears, axles, and teeth are graded after alkali-coated alloys: b) Screws, nuts and other non-essential parts are graded after carbonitrides: Grade 6; ) Carburized parts are graded after annealing and tempering, martensite and residual austenite ≤ Grade 5. 5.8.7.2 Depth of carburized layer: (equilibrium state) Carburized layers are measured from the surface to 1/2 of the wave zone: Alloy layers are measured from the surface to the original structure: Thin steel parts with a layer thickness of 0.30mm are measured from the surface to the original structure. 5.7 Deep quenching (hydrogen quenching or carbon quenching of ferrite) 5.1 Applicable parts: Applicable to parts that are not subjected to quenching, weak and have little sensitivity to quenching, such as feed dogs, needle pulls, etc. 5.7.2 Appearance: The color of the workpiece after quenching is uniform, and defects such as cracks, brittleness and scars are not allowed. 5.7.3 Surface thickness: It should meet the requirements of Table 5. 5.7.4 Effective quenching layer depth, see Table 5,
5.7.5 Deformation: The deformation should be controlled within the range that does not affect the resistance before use: Slender parts should be subjected to quenching treatment before treatment.
5.7.6 Metallographic structure
Metallographic structure after quenching: Surface compound layer (convex bright) + austenite quenching + over-plating layer (including α+β layer formed at the same temperature and nitrogen diffusion layer in α-F) meet the requirements of the standard. Table 5
Material category
Low alloy steel
Gold content pin structure pin [including aluminum]
Each end structure adjustment, Taiwan gold pin
Surface texture (HYan)
Net depth ni
Chemical layer Www.bzxZ.net
0.008-0.025
0.006~0.020
0.003~0. 015
Expansion management
6 Inspection method
QB/12527—2001
6.1 Appearance For the processing of grain, scratch, burn, pitting, residual oxide scale and other defects, daily measurement or low-power magnifying glass should be used for observation; important or easy to crack parts, such as commercial X-ray, magnetic, ultrasonic and other flaw detection inspection, shall be negotiated by the supply and demand parties or marked in the drawing. 6.2 The surface concentration of the stagnation layer shall be determined by the sample layer chemical or spectral determination of carbon and ion analysis. 6.3 Hardness: Before testing the hardness, the surface of the part should be clean and meet the relevant hardness requirements. When testing the hardness, generally more than four points should be taken, the first point indication value is removed, and the average of the three points is taken as the measured hardness value, including the three-point hardness value must be within the technical requirements of the part.
All kinds of hardness testing methods shall be carried out in accordance with GB/T230, GR/T231, GB/F1818, GD/T4340. 6.3.1 After annealing and normalizing, the parts shall be tested by Brinell hardness tester (HB) or Rockwell hardness tester (HRB). 6.3.2 After annealing and tempering, the flat parts shall be tested by Rockwell hardness tester or Vickers hardness tester. 5.3.3 If it is not possible to use a hardness meter to inspect parts, parts with similar shapes and sizes, micro materials, the same process or the same maintenance treatment can be used as a substitute, or the supplier and the belt supplier can negotiate the inspection method. 6.4 Effective hardening layer depth: The inspection method shall be in accordance with the relevant standards of GB/T5617, CB/T9450, GB/9451. See Table 6: Hardness conversion value GB/T1172, Table 6
and the United States
can be shared with the paint road
Effective acid layer depth (nm)
>0.10 --0.20
>0.35~0.50
>0.59~0.65
Home spots and kidneys
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