Some standard content:
JB/T7757.1
This standard is based on GB1239.2--89 "Technical conditions for cold-rolled cylindrical helical compression springs" and GR1239.6--92 "Design and calculation of cylindrical helical springs", and is revised from ZBJ22004·-88 "Cylindrical helical springs for mechanical seals" in combination with the special requirements of mechanical seals for springs. In terms of technical content, it is basically equivalent to the above two standards. This standard is mainly revised in terms of spring characteristics, permanent deformation, size and limit deviation, and acceptance sampling methods. See the preparation instructions for details.
This standard replaces 2BJ22004-88 from the date of implementation. Appendix A and Appendix B of this standard are both suggestive appendices. This standard was proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Tianjin Kelan Seal Co., Ltd. The main drafters of this standard are Liang Shuxian, Zhao Chen and He Xiangdong. 592
1 Scope
Mechanical Industry Standard of the People's Republic of China
Cylindrical Helical Springs for Mechanical Seals
JB/T7757.1---1995
Replaces ZB 122 04 · 88
This standard specifies the technical requirements, test methods and inspection rules for cold-rolled round-section cylindrical helical compression springs for mechanical seals. This standard applies to cold-rolled round-section cylindrical helical springs for mechanical seals. The cross-sectional diameter of the spring material (hereinafter referred to as wire diameter) is greater than or equal to 0.5mn.
2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were all valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards: GB/T3123-82 Silicon bronze wire
GI3/F3124—82 Tin bronze wire
GB1239.2-89 Technical conditions for cold-rolled cylindrical helical compression springs GH1239.5--89 Sampling inspection of cylindrical helical springs YB(T)11--83 Stainless steel wire for springs
3 Classification
The classification of spring structure types is shown in Table 1.
The Ministry of Machinery Industry of the People's Republic of China approved the structural type on June 16, 1995.
Both ends of the spring are tightly ground
(including one circle and two circles)
Radial hook springs at both ends
(inward or outward)
Both ends of the spring are ground 3/4 circles
·Radial end, axial end
Hook spring, both ends of the spring are ground 3/1 circles
1996-07-01Implementation
4 Technical requirements
JB/T 7757.
4.1 The finished spring should meet the requirements of this standard and be manufactured according to the product drawings and technical documents approved by the prescribed procedures. 4.2 Permanent deformation
After the finished spring is compressed three times with the test load, its permanent deformation should not be greater than 0.3% of the self-exit height. 4.3 Spring characteristics and limit deviations
4.3.1 Spring characteristics
Under the load of the specified height, the spring deformation should be between 20% and 8% of the deformation under the test load. Note: When measuring the spring characteristics, the maximum load allowed on the spring is taken as the test load P. . 4.3.2 Limit deviations of spring characteristics
The limit deviations of the spring load at the specified height shall be in accordance with the provisions of Table 2. Table 2
Effective number of turns
22~10
Limit deviations
4.3.3 Limit deviations of spring characteristics According to the agreement between the supply and demand parties, it can be used asymmetrically, and its tolerance value remains unchanged. 4.4 Dimensions and limit deviations
4.4.1 Spring outer diameter D (or inner diameter Dt)
The limit deviations of the spring outer diameter D (or inner diameter D) shall be in accordance with the provisions of Table 3. Table 3
Ratio ((Did
>8～15
Note: D is the spring middle diameter.
4.4.2 Free height.
Limit deviation
Minimum ±0.15
Spring free height H1, the limit deviation is in accordance with the provisions of Table 4. In order to ensure the spring characteristics, the spring used in single spring mechanical seals. The limit deviation of its free height can be used as a reference. Table 4
4.4.3 Total number of turns n1
Limit deviation
±0.03H, minimum ±0.7
Minimum soil (0.9
The limit deviation of the total number of turns is in accordance with the provisions of Table 5. In order to ensure the spring characteristics, the limit deviation of the total number of turns of the spring used in multi-spring mechanical seals can be used as a reference.
10~ 20
Limit deviation
JB/T 7757.1.
4.4.4 The limit deviation of the spring size can be used asymmetrically when necessary, and its tolerance value remains unchanged. 4.4.5 Perpendicularity
For springs with ground end faces, the perpendicularity of the spring axis to the two end faces in the free state is taken as 0.0524H (3°). 4.4.6 Pitch #
When the spring is compressed to 80% of the full deformation, its normal pitch circles should not touch. 4.4.7 Compression height H
In principle, the compression height of the spring is not specified, but for springs with end faces ground about 3/4 of a circle, when the compression height needs to be specified, the value calculated by formula (1) shall be taken as the maximum value.
Hi, nidua
Wherein, H. Compression height, mm;
\Total;
Maximum wire diameter (the sum of the material diameter and its maximum limit deviation). mm. 4.4.8 End grinding
. (1)
For springs with both ends tightly closed and ground, the ground portion of the support ring is greater than or equal to 3/4 of the circle, and its surface roughness Rα is 12.5lum. The end thickness is not less than 1/8d.
4.5 Appearance
The surface of the spring should be smooth and should not have harmful defects visible to the naked eye. However, individual small scratches with a depth not greater than half of the wire diameter tolerance are allowed.
For commonly used spring materials, see Table 6. If necessary, materials other than those listed in Table 6 can be used. Table 6
YB(T) I
GB/T3123
GB/T3124
Brown Standard Name
Stainless Steel Wire for Springs
Silicon Bronze Wire
Tin Arm Copper Wire
Spring materials must have a quality inspection certificate from the material manufacturer. They can only be used after being re-inspected and qualified by the spring manufacturer. 4.6.2
4.6.3 The quality of spring materials shall comply with the relevant provisions of the corresponding material standards. 4.6.4 When different spring materials are used, the corresponding heat treatment shall comply with the provisions of 4.8 and 4.9 in GB123.9.2. 4.6.5 When there are special technical requirements for springs, they shall be agreed upon by the supply and demand parties. 5 Inspection and Test Methods
5.1 Permanent Deformation
Compress the finished spring three times with the test load, measure the change in free height after the second and third compressions, and use this value as the permanent deformation of the spring.
5.2 Spring characteristics
5.2.1 The determination of spring characteristics is carried out after compressing the spring once to the test load. The test load is calculated based on the test stress specified in Table 7. When the calculated load is greater than the compression load, the compression load is used as the test load. Table 7
Test load
Stainless steel wire
Tensile strength×0.45
Bronze wire
Tensile strength×0.4
The test load is calculated using formula (2):
Where: -test load.N;
Test stress, N/mm\;
Wire diameter, mm;
Spring median diameter, mm.
JB/T7757.11995
P-Td\t/(8D)
5.2.2 The measurement of spring characteristics is carried out on a spring testing machine with an accuracy of not less than 1%. 5.3 Outer diameter (or inner diameter)
Measured with general or special measuring tools:
5.4 Free height
Measured with general or special tools to measure the highest point of the spring. 5.5 Verticality
Measured with a flat plate and a wide-seat angle ruler. Under no-load conditions, place the spring to be tested vertically on the flat plate, against the wide-seat angle ruler, rotate · week, and measure the maximum value △ of the end gap; then measure the other end face of the spring in this way (assess the adjacent first circle from the end to 1/2 circle), and take the larger value of the two measured values as the verticality error of the spring. As shown in Figure 1. Figure 1
5.6 Pitch
On the corresponding spring testing machine, compress the spring to 80% of the full deformation. The spring should not touch within the normal pitch circle. End surface roughness
The method of comparing with the roughness sample block is adopted. 5.8 Appearance
The appearance quality of the spring is checked by visual inspection or using a 5x magnifying glass.9 If there are special requirements for the test method, the supplier and the buyer shall specify it in the contract. 6 Inspection rules
6.1 The spring shall be inspected and qualified by the quality inspection department of the manufacturer according to this standard before it can be shipped out of the factory. 6.2 The acceptance sampling inspection of the product shall be in accordance with the provisions of GB1239.5. 6.3 The inspection of spring items shall be in accordance with the relevant provisions of Chapter 4 of this standard. 7 Marking, packaging, transportation and storage
7.1 The spring shall be cleaned before packaging. And anti-rust treatment shall be carried out. 7.2 The spring shall be packed reliably, and the weight of each box shall not exceed 20kg596
JB/T 7757.1--1995
7.3 The packaging box shall be accompanied by a product certificate, which shall include the following contents: a.
Manufacturer name;
Product name, type, part number and material: b.
Manufacturing date or production batch number;
Signature and seal of the technical inspection department.
The outside of the packaging box should be marked with:
Manufacturer name, trademark and address;
Product name, model and part number;
Number of pieces;
Gross weight:
Consignee and address;
"Handle with care" and "Moisture-proof" and other marks; Ex-factory date.
5 The product should be stored in a ventilated and dry warehouse. Under normal storage conditions, it will not rust within 12 months from the ex-factory date. 7.5
7.6 Special requirements for marking, packaging, transportation and storage should be agreed upon by the supply and demand parties. 597
JB/T 7757. 1 --1995
Appendix A
(Indicative Appendix)
Material Tensile Strength
A1 The tensile strength of stainless steel wire for springs shall be in accordance with the provisions of Table A1. Table A1
Tensile strength of stainless steel wire for spring
Wire diameter
ICr18Ni9
ICr18Ni9Ti
UCr19Ni10
OC-17Ni12Mo2
0Cr18Ni12Mo2Ti
15691814
1471～1716
1 3731618
13241569
1275~~1 520
11771422
1 079～1 324
981~1 226
1Cr18Ni9
1Cr18Ni9Ti
Cr19Ni10
1961~2 206
1863~2108
765-2 010
1 667~1 912
1 569~~1 814| | tt | 814
1 471 ～ 1 716
1373～1618
12751520
JB/T7757.1-1995
A2 The tensile strength of silicon bronze wire shall be in accordance with the provisions of Table A2. Table A2
Wire diameter mm
Tensile strength cN/mm2
Tin bronze wire tensile strength shall be in accordance with the provisions of Table A3 A3
Wire diameter
Tensile strength
0. 1~～ 2. 5
Appendix B
>2~~ 1. 2
(Appendix of tips)
Design and calculation of cylindrical helical spring
See Table B1 for common spring materials and performance parameters. B1
Performance parameters
Shear modulus C
Allowable shear stress
Recommended temperature range
Recommended hardness range
Stainless steel wire for spring
7)X103
200~300
Corrosion resistance, high and low temperature resistance
" is the shear modulus at room temperature.
Shear modulus at working temperature
Where G
Shear modulus at room temperature;
Silicon blue wire
41×103
40～120
90~100
Has high corrosion resistance and anti-magnetic
K.-—temperature correction coefficient. The K. values of the above two materials are selected according to Table B1-1. Table B1-1
Working temperature ℃
is the tensile strength of the material. N/mm\
The design calculation formula of B2 spring is shown in Table B2. 60
Tin bronze wire
250～~120
90--100
Has high wear resistance, corrosion resistance
and anti-magnetic properties
Parameter name (code)
Wire diameter (a)
Middle diameter of spring (D)
Inner diameter of spring (D)
Outer diameter of spring (). ）
Spring winding ratio (C\)
Spring height-to-diameter ratio ()
Curvature coefficient ()
Free height (H.)
Working height
Height under test load
Compressed height (Hb)
Pitch (t)
Effective number of turns (n)
Total number of turns (nt)
Number of supporting turns (n,)
Spring unfolded length (L)
Helix angle (α ）
Working load
Test load (P.)
Compression load (P)
Deformation under working load
Deformation under test load
Deformation under compression load
(Fb)
Spring stiffness (12\)
Material shear modulus (G)
Material tensile strength (t)
Test stress (t)
EN/mm2
JB/T 7757.1.-1995
Calculation formula
DD:--d=cd
k=(4C-1)/(4C—4)+0.615/(
=+1.5When H=m+
n=n→2.0When H㎡+1.5d
n+2.5When -
Hi... -- If. -Fi.
H、-H. - F.
Heandma
Recommendation (select within the range of 4～1
5
Both ends are ground flat
Both ends are tightened and ground flat for 3/4 turns. tdm is the maximum value of material diameter deviation
=d+F./n+=(0.28~0.5)D
=Gd*F./(8d'p,
L=(元Dm: )/cosanD)
a=arc tg(t/(x)]
P., -Gu'F./(&D'n)
P,=d\t./(8D)
F.-8P.In/(Gd*)
F', -- 8P.D'n/(Gu*)
p =P,/F,=Gd*/(8D\n)
Select from Table B1
Select from Table A1
Select from Table 7
It is called the clearance,
is generally taken as 20.1
The tail number is 1/4, 1/2, 3/4 or a full circle. 1/2 circle is recommended. α
When F≥F., take FF
Manufacturing date or production batch number;
Signature of the technical inspection department.
The outside of the packaging box should be marked with:
Manufacturer name, trademark and address;
Product name, model and part number;
Number of pieces;
Gross weight:
Receiving unit and address;
"Handle with care" and "Moisture-proof" and other marks; Ex-factory date.
5The product should be stored in a ventilated and dry warehouse. Under normal storage conditions, it will not rust within 12 months from the ex-factory date. 7.5
7.6Special requirements for marking, packaging, transportation and storage should be agreed upon by both the supplier and the buyer. 597
JB/T 7757. 1 --1995
Appendix A
(Suggestive Appendix)
Material Tensile Strength
A1 The tensile strength of stainless steel wire for spring shall be in accordance with the requirements of Table A1. Table A1
Tensile strength of stainless steel wire for spring
Wire diameter
ICr18Ni9
ICr18Ni9Ti
UCr19Ni10
OC-17Ni12Mo2
0Cr18Ni12Mo2Ti
15691814
1471～1716
1 3731618
13241569
1275~~1 520
11771422
1 079～1 324
981~1 226
1Cr18Ni9
1Cr18Ni9Ti
Cr19Ni10
1961~2 206
1863~2108
765-2 010
1 667~1 912
1 569~~1 814| | tt | 814
1 471 ～ 1 716
1373～1618
12751520
JB/T7757.1-1995
A2 The tensile strength of silicon bronze wire shall be in accordance with the provisions of Table A2. Table A2
Wire diameter mm
Tensile strength cN/mm2
Tin bronze wire tensile strength shall be in accordance with the provisions of Table A3 A3
Wire diameter
Tensile strength
0. 1~～ 2. 5
Appendix B
>2~~ 1. 2
(Appendix of tips)
Design calculation of cylindrical helical spring
See Table B1 for common spring materials and performance parameters. B1
Performance parameters
Shear modulus C
Allowable shear stress
Recommended temperature range
Recommended hardness range
Stainless steel wire for spring
7)X103
200~300
Corrosion resistance, high and low temperature resistance
" is the shear modulus at room temperature.
Shear modulus at working temperature
Where G
Shear modulus at room temperature;
Silicon blue wire
41×103
40～120
90~100
Has high corrosion resistance and anti-magnetic
K.-—temperature correction coefficient. The K. values of the above two materials are selected according to Table B1-1. Table B1-1
Working temperature ℃
is the tensile strength of the material. N/mm\
The design calculation formula of B2 spring is shown in Table B2. 60
Tin bronze wire
250～~120
90--100
Has high wear resistance, corrosion resistance
and anti-magnetic properties
Parameter name (code)
Wire diameter (a)
Middle diameter of spring (D)
Inner diameter of spring (D)
Outer diameter of spring (). ）
Spring winding ratio (C\)
Spring height-to-diameter ratio ()
Curvature coefficient ()
Free height (H.)
Working height
Height under test load
Compressed height (Hb)
Pitch (t)
Effective number of turns (n)
Total number of turns (nt)
Number of supporting turns (n,)
Spring unfolded length (L)
Helix angle (α ）
Working load
Test load (P.)
Compression load (P)
Deformation under working load
Deformation under test load
Deformation under compression load
(Fb)
Spring stiffness (12\)
Material shear modulus (G)
Material tensile strength (t)
Test stress (t)
EN/mm2
JB/T 7757.1.-1995
Calculation formula
DD:--d=cd
k=(4C-1)/(4C—4)+0.615/(
=+1.5When H=m+
n=n→2.0When H㎡+1.5d
n+2.5When -
Hi... -- If. -Fi.
H、-H. - F.
Heandma
Recommendation (select within the range of 4～1
5
Both ends are ground flat
Both ends are tightened and ground flat for 3/4 turns. tdm is the maximum value of material diameter deviation
=d+F./n+=(0.28~0.5)D
=Gd*F./(8d'p,
L=(元Dm: )/cosanD)
a=arc tg(t/(x)]
P., -Gu'F./(&D'n)
P,=d\t./(8D)
F.-8P.In/(Gd*)
F', -- 8P.D'n/(Gu*)
p =P,/F,=Gd*/(8D\n)
Select from Table B1
Select from Table A1
Select from Table 7
It is called the clearance,
is generally taken as 20.1
The tail number is 1/4, 1/2, 3/4 or a full circle. 1/2 circle is recommended. α
When F≥F., take FF
Manufacturing date or production batch number;
Signature of the technical inspection department.
The outside of the packaging box should be marked with:
Manufacturer name, trademark and address;
Product name, model and part number;
Number of pieces;
Gross weight:
Receiving unit and address;
"Handle with care" and "Moisture-proof" and other marks; Ex-factory date.
5The product should be stored in a ventilated and dry warehouse. Under normal storage conditions, it will not rust within 12 months from the ex-factory date. 7.5
7.6Special requirements for marking, packaging, transportation and storage should be agreed upon by both the supplier and the buyer. 597
JB/T 7757. 1 --1995
Appendix A
(Suggestive Appendix)
Material Tensile Strength
A1 The tensile strength of stainless steel wire for spring shall be in accordance with the requirements of Table A1. Table A1
Tensile strength of stainless steel wire for spring
Wire diameter
ICr18Ni9
ICr18Ni9Ti
UCr19Ni10
OC-17Ni12Mo2
0Cr18Ni12Mo2Ti
15691814
1471～1716
1 3731618
13241569
1275~~1 520
11771422
1 079～1 324
981~1 226
1Cr18Ni9
1Cr18Ni9Ti
Cr19Ni10
1961~2 206
1863~2108
765-2 010
1 667~1 912
1 569~~1 814| | tt | 814
1 471 ～ 1 716
1373～1618
12751520
JB/T7757.1-1995
A2 The tensile strength of silicon bronze wire shall be in accordance with the provisions of Table A2. Table A2
Wire diameter mm
Tensile strength cN/mm2
Tin bronze wire tensile strength shall be in accordance with the provisions of Table A3 A3
Wire diameter
Tensile strength
0. 1~～ 2. 5
Appendix B
>2~~ 1. 2
(Appendix of tips)
Design and calculation of cylindrical helical spring
See Table B1 for common spring materials and performance parameters. B1
Performance parameters
Shear modulus C
Allowable shear stress
Recommended temperature range
Recommended hardness range
Stainless steel wire for spring
7)X103
200~300
Corrosion resistance, high and low temperature resistance
" is the shear modulus at room temperature.
Shear modulus at working temperature
Where G
Shear modulus at room temperature;
Silicon blue wire
41×103
40～120
90~100
Has high corrosion resistance and anti-magnetic
K.-—temperature correction coefficient. The K. values of the above two materials are selected according to Table B1-1. Table B1-1
Working temperature ℃
is the tensile strength of the material. N/mm\
The design calculation formula of B2 spring is shown in Table B2. 60
Tin bronze wire
250～~120
90--100
Has high wear resistance, corrosion resistance
and anti-magnetic properties
Parameter name (code)
Wire diameter (a)
Middle diameter of spring (D)
Inner diameter of spring (D)
Outer diameter of spring (). ）
Spring winding ratio (C\)
Spring height-to-diameter ratio ()
Curvature coefficient ()
Free height (H.)
Working height
Height under test load
Compressed height (Hb)
Pitch (t)
Effective number of turns (n)
Total number of turns (nt)
Number of supporting turns (n,)
Spring unfolded length (L)
Helix angle (α ）
Working load
Test load (P.)
Compression load (P)
Deformation under working load
Deformation under test load
Deformation under compression load
(Fb)
Spring stiffness (12\)
Material shear modulus (G)
Material tensile strength (t)
Test stress (t)
EN/mm2
JB/T 7757.1.-1995
Calculation formula
DD:--d=cd
k=(4C-1)/(4C—4)+0.615/(
=+1.5When H=m+
n=n→2.0When H㎡+1.5d
n+2.5When -
Hi... -- If. -Fi.
H、-H. - F.
Heandma
Recommendation (select within the range of 4～1
5
Both ends are ground flat
Both ends are tightened and ground flat for 3/4 turns. tdm is the maximum value of material diameter deviation
=d+F./n+=(0.28~0.5)D
=Gd*F./(8d'p,
L=(元Dm: )/cosanD)
a=arc tg(t/(x)]
P., -Gu'F./(&D'n)
P,=d\t./(8D)
F.-8P.In/(Gd*)
F', -- 8P.D'n/(Gu*)
p =P,/F,=Gd*/(8D\n)
Select from Table B1
Select from Table A1
Select from Table 7
It is called the clearance,
is generally taken as 20.1
The tail number is 1/4, 1/2, 3/4 or a full circle. 1/2 circle is recommended. α
When F≥F., take FF1 --1995
Appendix A
(Suggestive Appendix)
Tensile strength of materials
A1 The tensile strength of stainless steel wire for springs shall be as specified in Table A1. Table A1
Tensile strength of stainless steel wire for spring
Wire diameter
ICr18Ni9
ICr18Ni9Ti
UCr19Ni10
OC-17Ni12Mo2
0Cr18Ni12Mo2Ti
15691814
1471～1716
1 3731618
13241569
1275~~1 520
11771422
1 079～1 324
981~1 226
1Cr18Ni9
1Cr18Ni9Ti
Cr19Ni10
1961~2 206
1863~2108
765-2 010
1 667~1 912
1 569~~1 814| | tt | 814
1 471 ～ 1 716
1373～1618
12751520
JB/T7757.1-1995
A2 The tensile strength of silicon bronze wire shall be in accordance with the provisions of Table A2. Table A2
Wire diameter mm
Tensile strength cN/mm2
Tin bronze wire tensile strength shall be in accordance with the provisions of Table A3 A3
Wire diameter
Tensile strength
0. 1~～ 2. 5
Appendix B
>2~~ 1. 2
(Appendix of tips)
Design and calculation of cylindrical helical spring
See Table B1 for common spring materials and performance parameters. B1
Performance parameters
Shear modulus C
Allowable shear stress
Recommended temperature range
Recommended hardness range
Stainless steel wire for spring
7)X103
200~300
Corrosion resistance, high and low temperature resistance
" is the shear modulus at room temperature.
Shear modulus at working temperature
Where G
Shear modulus at room temperature;
Silicon blue wire
41×103
40～120
90~100
Has high corrosion resistance and anti-magnetic
K.-—temperature correction coefficient. The K. values of the above two materials are selected according to Table B1-1. Table B1-1
Working temperature ℃
is the tensile strength of the material. N/mm\
The design calculation formula of B2 spring is shown in Table B2. 60
Tin bronze wire
250～~120
90--100
Has high wear resistance, corrosion resistance
and anti-magnetic properties
Parameter name (code)
Wire diameter (a)
Middle diameter of spring (D)
Inner diameter of spring (D)
Outer diameter of spring (). ）
Spring winding ratio (C\)
Spring height-to-diameter ratio ()
Curvature coefficient ()
Free height (H.)
Working height
Height under test load
Compressed height (Hb)
Pitch (t)
Effective number of turns (n)
Total number of turns (nt)
Number of supporting turns (n,)
Spring unfolded length (L)
Helix angle (α ）
Working load
Test load (P.)
Compression load (P)
Deformation under working load
Deformation under test load
Deformation under compression load
(Fb)
Spring stiffness (12\)
Material shear modulus (G)
Material tensile strength (t)
Test stress (t)
EN/mm2
JB/T 7757.1.-1995
Calculation formula
DD:--d=cd
k=(4C-1)/(4C—4)+0.615/(
=+1.5When H=m+
n=n→2.0When H㎡+1.5d
n+2.5When -
Hi... -- If. -Fi.
H、-H. - F.
Heandma
Recommendation (select within the range of 4～1
5
Both ends are ground flat
Both ends are tightened and ground flat for 3/4 turns. tdm is the maximum value of material diameter deviation
=d+F./n+=(0.28~0.5)D
=Gd*F./(8d'p,
L=(元Dm: )/cosanD)
a=arc tg(t/(x)]
P., -Gu'F./(&D'n)
P,=d\t./(8D)
F.-8P.In/(Gd*)
F', -- 8P.D'n/(Gu*)
p =P,/F,=Gd*/(8D\n)
Select from Table B1
Select from Table A1
Select from Table 7
It is called the clearance,
is generally taken as 20.1
The tail number is 1/4, 1/2, 3/4 or a full circle. 1/2 circle is recommended. α
When F≥F., take FF1 --1995
Appendix A
(Suggestive Appendix)
Tensile strength of materials
A1 The tensile strength of stainless steel wire for springs shall be as specified in Table A1. Table A1
Tensile strength of stainless steel wire for spring
Wire diameter
ICr18Ni9
ICr18Ni9Ti
UCr19Ni10
OC-17Ni12Mo2
0Cr18Ni12Mo2Ti
15691814
1471～1716
1 3731618
13241569
1275~~1 520
11771422
1 079～1 324
981~1 226
1Cr18Ni9
1Cr18Ni9Ti
Cr19Ni10
1961~2 206
1863~2108
765-2 010
1 667~1 912
1 569~~1 814| | tt | 814
1 471 ～ 1 716
1373～1618
12751520
JB/T7757.1-1995
A2 The tensile strength of silicon bronze wire shall be in accordance with the provisions of Table A2. Table A2
Wire diameter mm
Tensile strength cN/mm2
Tin bronze wire tensile strength shall be in accordance with the provisions of Table A3 A3
Wire diameter
Tensile strength
0. 1~～ 2. 5
Appendix B
>2~~ 1. 2
(Appendix of tips)
Design and calculation of cylindrical helical spring
See Table B1 for common spring materials and performance parameters. B1
Performance parameters
Shear modulus C
Allowable shear stress
Recommended temperature range
Recommended hardness range
Stainless steel wire for spring
7)X103
200~300
Corrosion resistance, high and low temperature resistance
" is the shear modulus at room temperature.
Shear modulus at working temperatureWww.bzxZ.net
Where G
Shear modulus at room temperature;
Silicon blue wire
41×103
40～120
90~100
Has high corrosion resistance and anti-magnetic
K.-—temperature correction coefficient. The K. values of the above two materials are selected according to Table B1-1. Table B1-1
Working temperature ℃
is the tensile strength of the material. N/mm\
The design calculation formula of B2 spring is shown in Table B2. 60
Tin bronze wire
250～~120
90--100
Has high wear resistance, corrosion resistance
and anti-magnetic properties
Parameter name (code)
Wire diameter (a)
Middle diameter of spring (D)
Inner diameter of spring (D)
Outer diameter of spring (). ）
Spring winding ratio (C\)
Spring height-to-diameter ratio ()
Curvature coefficient ()
Free height (H.)
Working height
Height under test load
Compressed height (Hb)
Pitch (t)
Effective number of turns (n)
Total number of turns (nt)
Number of supporting turns (n,)
Spring unfolded length (L)
Helix angle (α ）
Working load
Test load (P.)
Compression load (P)
Deformation under working load
Deformation under test load
Deformation under compression load
(Fb)
Spring stiffness (12\)
Material shear modulus (G)
Material tensile strength (t)
Test stress (t)
EN/mm2
JB/T 7757.1.-1995
Calculation formula
DD:--d=cd
k=(4C-1)/(4C—4)+0.615/(
=+1.5When H=m+
n=n→2.0When H㎡+1.5d
n+2.5When -
Hi... -- If. -Fi.
H、-H. - F.
Heandma
Recommendation (select within the range of 4～1
5
Both ends are ground flat
Both ends are tightened and ground flat for 3/4 turns. tdm is the maximum value of material diameter deviation
=d+F./n+=(0.28~0.5)D
=Gd*F./(8d'p,
L=(元Dm: )/cosanD)
a=arc tg(t/(x)]
P., -Gu'F./(&D'n)
P,=d\t./(8D)
F.-8P.In/(Gd*)
F', -- 8P.D'n/(Gu*)
p =P,/F,=Gd*/(8D\n)
Select from Table B1
Select from Table A1
Select from Table 7
It is called the clearance,
is generally taken as 20.1
The tail number is 1/4, 1/2, 3/4 or a full circle. 1/2 circle is recommended. α
When F≥F., take FFN/mm\
The design calculation formula of B2 spring is shown in Table B2. 60
Tin bronze wire
250～~120
90--100
Has high wear resistance, corrosion resistance
and anti-magnetic properties
Parameter name (code)
Wire diameter (a)
Middle diameter of spring (D)
Inner diameter of spring (D)
Outer diameter of spring (). ）
Spring winding ratio (C\)
Spring height-to-diameter ratio ()
Curvature coefficient ()
Free height (H.)
Working height
Height under test load
Compressed height (Hb)
Pitch (t)
Effective number of turns (n)
Total number of turns (nt)
Number of supporting turns (n,)
Spring unfolded length (L)
Helix angle (α ）
Working load
Test load (P.)
Compression load (P)
Deformation under working load
Deformation under test load
Deformation under compression load
(Fb)
Spring stiffness (12\)
Material shear modulus (G)
Material tensile strength (t)
Test stress (t)
EN/mm2
JB/T 7757.1.-1995
Calculation formula
DD:--d=cd
k=(4C-1)/(4C—4)+0.615/(
=+1.5When H=m+
n=n→2.0When H㎡+1.5d
n+2.5When -
Hi... -- If. -Fi.
H、-H. - F.
Heandma
Recommendation (select within the range of 4～1
5
Both ends are ground flat
Both ends are tightened and ground flat for 3/4 turns. tdm is the maximum value of material diameter deviation
=d+F./n+=(0.28~0.5)D
=Gd*F./(8d'p,
L=(元Dm: )/cosanD)
a=arc tg(t/(x)]
P., -Gu'F./(&D'n)
P,=d\t./(8D)
F.-8P.In/(Gd*)
F', -- 8P.D'n/(Gu*)
p =P,/F,=Gd*/(8D\n)
Select from Table B1
Select from Table A1
Select from Table 7
It is called the clearance,
is generally taken as 20.1
The tail number is 1/4, 1/2, 3/4 or a full circle. 1/2 circle is recommended. α
When F≥F., take FFN/mm\
The design calculation formula of B2 spring is shown in Table B2. 60
Tin bronze wire
250～~120
90--100
Has high wear resistance, corrosion resistance
and anti-magnetic properties
Parameter name (code)
Wire diameter (a)
Middle diameter of spring (D)
Inner diameter of spring (D)
Outer diameter of spring (). ）
Spring winding ratio (C\)
Spring height-to-diameter ratio ()
Curvature coefficient ()
Free height (H.)
Working height
Height under test load
Compressed height (Hb)
Pitch (t)
Effective number of turns (n)
Total number of turns (nt)
Number of supporting turns (n,)
Spring unfolded length (L)
Helix angle (α ）
Working load
Test load (P.)
Compression load (P)
Deformation under working load
Deformation under test load
Deformation under compression load
(Fb)
Spring stiffness (12\)
Material shear modulus (G)
Material tensile strength (t)
Test stress (t)
EN/mm2
JB/T 7757.1.-1995
Calculation formula
DD:--d=cd
k=(4C-1)/(4C—4)+0.615/(
=+1.5When H=m+
n=n→2.0When H㎡+1.5d
n+2.5When -
Hi... -- If. -Fi.
H、-H. - F.
Heandma
Recommendation (select within the range of 4～1
5
Both ends are ground flat
Both ends are tightened and ground flat for 3/4 turns. tdm is the maximum value of material diameter deviation
=d+F./n+=(0.28~0.5)D
=Gd*F./(8d'p,
L=(元Dm: )/cosanD)
a=arc tg(t/(x)]
P., -Gu'F./(&D'n)
P,=d\t./(8D)
F.-8P.In/(Gd*)
F', -- 8P.D'n/(Gu*)
p =P,/F,=Gd*/(8D\n)
Select from Table B1
Select from Table A1
Select from Table 7
It is called the clearance,
is generally taken as 20.1
The tail number is 1/4, 1/2, 3/4 or a full circle. 1/2 circle is recommended. α
When F≥F., take FF
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