JB/T 7796-2017 Tension and compression spring testing machines
1 Scope
This standard specifies the symbols and units, series of main parameters, technical requirements, inspection methods, inspection rules, marking and packaging of tension and compression spring testing machines.
This standard is applicable to tension and/or compression spring testing machines with a maximum capacity of 1,000kN or less (hereinafter referred to as “testing machines”).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 2611-2007 General requirements for testing machines
GB/T 13634-2008 Calibration of force-proving instruments used for the verification of uniaxial testing machines
JB/T 6147-2007 Requirements for the packaging, packaging marking and handling of testing machine products
3 Symbols and units
The symbols and units used in this standard are given in Table 1.
Table 1 Symbols and units
Symbol Unit Description
a % Relative resolution of the force indicator of the testing machine
b % Indication repeatability of the force-measuring system of the testing machine
e mm Deformation indication error
f0 % Relative zero error of the force-measuring system of the testing machine
f0' % Zero drift of the force indicator of the testing machine
F N True force indicated by the force-proving instrument with increasing force
F' N True force indicated by the force-proving instrument with decreasing force
F N Arithmetic mean of multiple measurements of indication F at the same force point
Fi N Force indicated by the force indicator of the testing machine under verification with increasing force
Fi' N Force indicated by the force indicator of the testing machine under verification with decreasing force
Fi N Arithmetic mean of multiple measurements of indication Fi at the same force point
Fimax N Maximum value of indication Fi at the same force point
Fimin N Minimum value of indication Fi at the same force point
Fi0 N Residual indication of the force indicator of the testing machine under verification after removal of the force
Fi0' N Drift of the zero indication of the force indicator of the testing machine
Fmax N Maximum value of indication F at the same force point
Fmin N Minimum value of indication F at the same force point
Fɴ N Maximum capacity of each measuring range of the force indicator of the testing machine
FV N Lower limit of each measuring range of the force indicator of the testing machine
L mm Indication of the deformation measuring device
l mm Distance between the platens measured at any position
LN mm Length indication measured with a vernier caliper (or equivalent length-measuring instrument)
Nb dB(A) Background noise
Nc dB(A) Noise correction value
Nimax dB(A) Maximum noise measured during operation of the testing machine
q % Relative indication error of the force-measuring system of the testing machine
r N Resolution of the force indicator of the testing machine
η dB(A) Noise during operation of the testing machine
v % Relative reversibility error of the force-measuring system of the testing machine
4 Series of main parameters
Contents
Foreword III
1 Scope
2 Normative references
3 Symbols and units
4 Series of main parameters
5 Technical requirements
5.1 Environmental and operating conditions
5.2 Classification and permissible errors
5.3 General requirements
5.4 Discrimination threshold
5.5 Tension device
5.6 Compression device
5.7 Loading and force-measuring system
5.8 Deformation measuring device
5.9 Safety devices
5.10 Noise
5.11 Resistance to transport bumping
5.12 Requirements for electrical equipment
5.13 Other requirements
6 Inspection methods
6.1 Inspection conditions
6.2 Inspection apparatus
6.3 Inspection of various errors of test force
6.4 Inspection of compliance with general requirements
6.5 Inspection of discrimination threshold
6.6 Inspection of tension device
6.7 Inspection of compression device
6.8 Inspection of the force-measuring system
6.9 Inspection of the deformation measuring device
6.10 Inspection of safety devices
6.11 Inspection of noise
6.12 Inspection of resistance to transport bumping
6.13 Inspection of electrical equipment
6.14 Inspection of compliance with other requirements
7 Inspection rules
7.1 End-of-manufacturing inspection
7.2 Type inspection
7.3 Judgment rules
8 Marking and packaging
8.1 Marking
8.2 Packaging
Figure 1 Schematic diagram for the test force reversibility difference
Table 1 Symbols and units
Table 2 Series of main parameters of testing machines
Table 3 Permissible errors of test force
Table 4 Parallelism of the upper and lower platens
Table 5 Permissible deviation of the center lines of the upper and lower platens
Table 6 Maximum permissible errors of indication of deformation measuring devices
Table 7 Noise levels
Table 8 Inspection of the verticality of the working piston and the support device for specimen compression
Table 9 Noise correction values
Standard
JB/T 7796-2017 Tension and compression spring testing machines (English)
JB/T 7796-2017 Tension and compression spring testing machines
1 Scope
This standard specifies the symbols and units, series of main parameters, technical requirements, inspection methods, inspection rules, marking and packaging of tension and compression spring testing machines.
This standard is applicable to tension and/or compression spring testing machines with a maximum capacity of 1,000kN or less (hereinafter referred to as “testing machines”).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 2611-2007 General requirements for testing machines
GB/T 13634-2008 Calibration of force-proving instruments used for the verification of uniaxial testing machines
JB/T 6147-2007 Requirements for the packaging, packaging marking and handling of testing machine products
3 Symbols and units
The symbols and units used in this standard are given in Table 1.
Table 1 Symbols and units
Symbol Unit Description
a % Relative resolution of the force indicator of the testing machine
b % Indication repeatability of the force-measuring system of the testing machine
e mm Deformation indication error
f0 % Relative zero error of the force-measuring system of the testing machine
f0' % Zero drift of the force indicator of the testing machine
F N True force indicated by the force-proving instrument with increasing force
F' N True force indicated by the force-proving instrument with decreasing force
F N Arithmetic mean of multiple measurements of indication F at the same force point
Fi N Force indicated by the force indicator of the testing machine under verification with increasing force
Fi' N Force indicated by the force indicator of the testing machine under verification with decreasing force
Fi N Arithmetic mean of multiple measurements of indication Fi at the same force point
Fimax N Maximum value of indication Fi at the same force point
Fimin N Minimum value of indication Fi at the same force point
Fi0 N Residual indication of the force indicator of the testing machine under verification after removal of the force
Fi0' N Drift of the zero indication of the force indicator of the testing machine
Fmax N Maximum value of indication F at the same force point
Fmin N Minimum value of indication F at the same force point
Fɴ N Maximum capacity of each measuring range of the force indicator of the testing machine
FV N Lower limit of each measuring range of the force indicator of the testing machine
L mm Indication of the deformation measuring device
l mm Distance between the platens measured at any position
LN mm Length indication measured with a vernier caliper (or equivalent length-measuring instrument)
Nb dB(A) Background noise
Nc dB(A) Noise correction value
Nimax dB(A) Maximum noise measured during operation of the testing machine
q % Relative indication error of the force-measuring system of the testing machine
r N Resolution of the force indicator of the testing machine
η dB(A) Noise during operation of the testing machine
v % Relative reversibility error of the force-measuring system of the testing machine
4 Series of main parameters
Contents of JB/T 7796-2017
Contents
Foreword III
1 Scope
2 Normative references
3 Symbols and units
4 Series of main parameters
5 Technical requirements
5.1 Environmental and operating conditions
5.2 Classification and permissible errors
5.3 General requirements
5.4 Discrimination threshold
5.5 Tension device
5.6 Compression device
5.7 Loading and force-measuring system
5.8 Deformation measuring device
5.9 Safety devices
5.10 Noise
5.11 Resistance to transport bumping
5.12 Requirements for electrical equipment
5.13 Other requirements
6 Inspection methods
6.1 Inspection conditions
6.2 Inspection apparatus
6.3 Inspection of various errors of test force
6.4 Inspection of compliance with general requirements
6.5 Inspection of discrimination threshold
6.6 Inspection of tension device
6.7 Inspection of compression device
6.8 Inspection of the force-measuring system
6.9 Inspection of the deformation measuring device
6.10 Inspection of safety devices
6.11 Inspection of noise
6.12 Inspection of resistance to transport bumping
6.13 Inspection of electrical equipment
6.14 Inspection of compliance with other requirements
7 Inspection rules
7.1 End-of-manufacturing inspection
7.2 Type inspection
7.3 Judgment rules
8 Marking and packaging
8.1 Marking
8.2 Packaging
Figure 1 Schematic diagram for the test force reversibility difference
Table 1 Symbols and units
Table 2 Series of main parameters of testing machines
Table 3 Permissible errors of test force
Table 4 Parallelism of the upper and lower platens
Table 5 Permissible deviation of the center lines of the upper and lower platens
Table 6 Maximum permissible errors of indication of deformation measuring devices
Table 7 Noise levels
Table 8 Inspection of the verticality of the working piston and the support device for specimen compression
Table 9 Noise correction values
