GB/T 3478.5-2008 PDF English
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Straight cylindrical involute splines -- Metric module, side fit -- Part 5: Inspection
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Straight cylindrical involute splines inspection methods
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GB/T 3478.5-2008: PDF in English (GBT 3478.5-2008) GB/T 3478.5-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.120.30
J 18
Replacing GB/T 3478.5-1995
Straight cylindrical involute splines -
Metric module, side fit - Part 5: Inspection
(ISO 4156-3:2005, Straight cylindrical involute splines -
Metric module, side fit - Part 3: Inspection, MOD)
ISSUED ON: SEPTEMBER 22, 2008
IMPLEMENTED ON: MAY 01, 2009
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Standard temperature ... 6
4 Inspection of major diameter and minor diameter of spline ... 6
5 Inspection of the space width of internal spline, tooth thickness of external
spline, diameter of involute end circle, diameter of involute starting circle ... 6
6 Selection and labeling of inspection methods ... 15
Appendix A (Normative) Gauges ... 18
Foreword
GB/T 3478 “Straight cylindrical involute splines - Metric module, side fit” is
divided into 9 parts:
- Part 1: Generalities;
- Part 2: 30° pressure angle dimensions tables;
- Part 3: 37.5° pressure angle dimensions tables;
- Part 4: 45° pressure angle dimensions tables;
- Part 5: Inspection;
- Part 6: 30° pressure angle M and W values;
- Part 7: 37.5° pressure angle M and W values;
- Part 8: 45° pressure angle M and W values;
- Part 9: Measuring pin.
This part is the part 5 of GB/T 3478.
This part modifies and adopts ISO 4156-3:2005 “Straight cylindrical involute
splines - Metric module, side fit - Part 3: Inspection”. The main differences are
as follows:
- Respectively INCLUDE the calculation of the diameter of the measuring bar
DRi and DRe in clause 8.5, the calculation of pin spacing MRi and cross-pin
distance MRe in clause 8.6, the calculation of the average length W of the
common nominal line of the external spline in clause 9 of ISO 4156-3:2005
into part 6, part 7, part 8 of GB/T 3478;
- MOVE the gauge design part of clause 10 of ISO 4156-3:2005 into
Appendix A;
- ADD the one-way test method;
- ADD the analytical inspection; INCLUDE the appendix (indexing error
analysis) of ISO 4156-3:2005 into clause 5.4.
This part is a revision of GB/T 3478.5-1995 “Straight cylindrical involute splines
- Inspection methods”.
The main differences between this part and GB/T 3478.5-1995 are as follows:
Straight cylindrical involute splines -
Metric module, side fit - Part 5: Inspection
1 Scope
This part of GB/T 3478 specifies the test method for the straight cylindrical
involute splines.
This part is applicable to the inspection of splines manufactured according to
GB/T 3478.1. It may also be used as a reference when using the gauge to
inspect the straight cylindrical involute splines.
2 Normative references
The provisions in following documents become the provisions of this part
through reference in this part of GB/T 3478. For the dated references, the
subsequent amendments (excluding corrections) or revisions do not apply to
this part; however, parties who reach an agreement based on this standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB/T 1957 Tolerances and general features for plain limit gauges
GB/T 3478.1 Straight cylindrical involute splines - Metric module side fit -
Part 1: Generalities (GB/T 3478.1-2008, ISO 4156-1:2005, MOD)
GB/T 3478.6 Straight cylindrical involute splines - Metric module side fit -
Part 6: 30° pressure angle M and W values
GB/T 3478.7 Straight cylindrical involute splines - Metric module side fit -
Part 7: 37.5° pressure angle M and W values
GB/T 3478.8 Straight cylindrical involute splines - Metric module side fit -
Part 8: 45° pressure angle M and W values
GB/T 3478.9 Straight cylindrical involute splines - Metric module side fit -
Part 9: Measuring pin
GB/T 13924 Inspection code for accuracy of involute cylindrical gears
3 Standard temperature
The standard temperature for measurement is 20 °C.
4 Inspection of major diameter and minor diameter of
spline
4.1 The limit size of the minor diameter of the internal spline Dii may be checked
by the general smooth GO plug gauge and the NO GO plug gauge, it may also
be measured by other methods.
4.2 The limit size of the minor diameter of the external spline Dee may be
checked by the general smooth GO plug gauge and the NO GO plug gauge, it
may also be measured by other methods.
4.3 The use of general smooth plug gauge and ring gauge shall comply with
the provisions of GB/T 1957.
4.4 The major diameter of internal spline Dei, the minor diameter of external
spline Die, the minimum radius of curvature of the root arc may be guaranteed
by the process. If necessary, it shall be tested.
5 Inspection of the space width of internal spline, tooth
thickness of external spline, diameter of involute end
circle, diameter of involute starting circle
In GB/T 3478.1, it specifies three composite inspection methods and one single-
item inspection method, totally four inspection methods, which are used to
inspect four limit sizes of the space width and the tooth thickness (see Figure
1), as well as the minimum value of diameter of the involute’s end circle DFi min
and the maximum value of the diameter of the starting circle DFe max.
See Appendix A for the involute spline gauges used to inspect the space width
and tooth thickness.
thereby controlling the minimum value Cv min of the active side gap.
At the same time, use the non-whole-depth NO GO spline gauge (plug gauge
or ring gauge) or use the measured M value (pin spacing MRi or cross-pin
distance MRe) (for the external spline, it may use the average length W value of
the measured common normal line), to control the maximum value of actual
space width of the internal spline Emax or the minimum value of the actual tooth
thickness of the external spline Smin, thereby controlling the minimum physical
size of the internal and external.
5.2 Method-A
On the basis of the basic method, add the use of NO GO composite spline
gauge (plug gauge or ring gauge), to control the maximum value of the active
space width of the internal spline Ev max or the minimum value of the active tooth
thickness of the external spline Sv min, thereby controlling the maximum value
Cv max of the active side gap.
This method is suitable for two-way-rotation transmissions that have return
requirements.
5.3 Method-B
Use the GO composite spline gauge and the NO GO composite spline gauge
(plug gauge or ring gauge) to respectively control the minimum value Ev min and
the maximum value Ev max of the active space width of the internal spline or the
maximum value Sv max and the minimum value Sv min of the active tooth thickness
of the external spline, thereby controlling the minimum value Cv min and the
maximum value Cv max of the active side gap.
This method may only be used when the method-A is adopted, and it is proved
by mass production that the process quality is stable. If the process quality
fluctuates and may affect the product quality, it shall also use the method-A.
5.4 Single-item inspection method
Use the NO GO sector gauge and the NO GO sector gauge, or the pin spacing
MRi, to control the maximum value Emax and the minimum value Emin of the
actual space width of the internal spline. Use the NO GO sector gauge and the
NO GO sector gauge, or the measured cross-pin distance MRe or the average
length W value of common nominal line, to control the maximum value Smax and
the minimum value Smin of the actual tooth thickness of the external spline.
At the same time, use the measured total pitch error, the tooth profile error, the
tooth helix error to control the integrated error.
This method is suitable for splines which are single-item or small-batch
5.4.4 Inspection of measured size M value by measuring pin
5.4.4.1 The diameter of the measuring pin (DRi, DRe) as well as the measured
size M value of the measuring pin (MRi min, MRi max, MRe min, MRe max) are as shown
in GB/T 3478.6 ~ 3478.8.
5.4.4.2 Measuring pin for measurement shall comply with the provisions of
GB/T 3478.9.
5.4.4.3 When the diameter of the actually-selected measuring pin is different
from those as listed in GB/T 3478.9, the M value shall be calculated according
to the diameter of the actually-selected measuring pin.
5.4.4.4 The M values (maximum and minimum values) as actually-measured
on the same external spline shall be within the range of specified limits.
5.4.5 Inspection of average length W of common normal line
5.4.5.1 The average length W value of the common nominal line and the
number of crossed-teeth which is used for the external spline are as shown in
GB/T 3478.6 ~ 3478.8.
5.4.5.2 The length of the common nominal line as actually-measured on the
same external spline takes the average value, which shall be within the range
of specified limits.
6 Selection and labeling of inspection methods
6.1 The selection of the inspection method for the space width and tooth
thickness of spline shall be determined by the product designer according to
the structural characteristics and functional requirements of the product, or
determined by the supplier's process conditions or the means of inspection by
both parties.
6.2 The requirements for piece-by-piece inspection, first-piece inspection, spot
inspection or regular inspection of spline parts shall be determined and
incorporated into the process documents according to the importance of the
spline parts and the stability of the process quality.
6.3 After the inspection method is selected, it shall indicate the following items
on the spline part drawing or the agreement between the supplier and the
purchaser. It may either be indicated together with other parameters of spline
by forms, or be directly written into the technical requirements.
6.3.1 When using the basic method for inspection, it shall be indicated of the
following items:
Internal spline:
a) The minimum value of the active space width Ev min;
b) The maximum value of the actual space width Emax.
External spline:
a) The maximum tooth thickness of the active tooth thickness Sv max;
b) The minimum tooth thickness of the actual tooth thickness Smin.
6.3.2 When using the method-A for inspection, it shall be indicated of the
following items:
Internal spline:
a) The minimum value of the active space width Ev min;
b) The maximum value of the active space width Ev max;
c) The maximum value of the actual space width Emax.
External spline:
a) The maximum tooth thickness of active tooth thickness Sv max;
b) The minimum tooth thickness of active tooth thickness Sv min;
c) The minimum tooth thickness of actual tooth thickness Smin.
6.3.3 When using the method-B for inspection, it shall be indicated of the
following items:
Internal spline:
a) The minimum value of the active space width Ev min;
b) The maximum value of the active space width Ev max;
c) The maximum value of the actual space width Emax (process
guarantee).
External spline:
a) The maximum tooth thickness of active tooth thickness Sv max;
b) The minimum tooth thickness of active tooth thickness Sv min;
c) The minimum tooth thickness of actual tooth thickness Smin (process
Appendix A
(Normative)
Gauges
A.1 General
A.1.1 Conditions of use of gauges
A.1.1.1 GO gauges
The GO composite plug and ring gauges shall enter or pass over the complete
spline length. Composite spline gauges shall be used without excessive force
to prevent damage or distortion to the component or gauge. In case of
disagreement, the composite gauge shall be accorded precedence in the
acceptance or rejection of a part. If there are two gauges available and both are
within the gauge tolerances, the gauge which fits the part shall be accorded
precedence.
If a part is rejected by the GO composite gauge, the gauge itself cannot provide
the reason. The reason can only be identified by the measurement of the actual
tooth thickness or space width using measuring pins or balls, as well as the
analytical inspection of total pitch error, tooth profile error, tooth helix error.
A.1.1.2 NO GO sector gauge
The NO GO sector gauge shall enter and pass completely through any specified
position of the entire spline length. The inspection shall be carried out in at least
three positions as equally-distributed as possible.
A.1.1.3 NO GO composite gauge
The NO GO composite gauge shall not enter the spline being inspected.
A.1.2 Limiting dimensions of use for gauges
The convenience of use of gauge is limited by the mass and size of the gauge.
When the diameter of indexing circle D ≤ 180 mm, it may be tested by the gauge.
The diameter of indexing circle of gauge D > 180 mm. If the agreed between
the supplier and the purchaser, the both parties may use the gauge.
A.1.3 Structure of spline plug gauge
A plug gauge which has a diameter of indexing circle D < 50 mm may be integral.
Minor diameter:
A.5.4 Form diameter
Inspection method: Involute inspection instrument.
A.5.5 Tooth thickness of plug gauge
Inspection method: measurement by more than 2 measuring pins.
Measurements shall be made within the range of 0° ~ 90° at each end and in
the middle of the pin length. To avoid wear and small dirt, the measuring pin
shall be wiped clean. Measuring pins may have a tolerance that affects the
measurement. In order to meet the requirements, it shall use a calibrated
measuring pin which has an exact diameter.
A.5.6 Space width of ring gauge
The inspection method is same as in A.5.5. The ring gauge is inspected by the
use of measuring pin and gauge block. If the gauge block can be axially moved
without obstruction meanwhile there is no radial movement, the ring gauge is
qualified.
A taper master plug gauge may also be used to inspect the size of the ring
gauge.
A.5.7 Shape tolerance
Inspection method: gear measuring machine. The tooth profile error and the
tooth helix error shall be measured in at least three equally-spaced angular
positions on the left or right flanks. For composite gauges, the total pitch error
and the indexing error may also be inspected.
A.5.8 Gauge wear inspection
During a test cycle, it shall be ensured that the gauge is still within the wear
limit. When the spline’s space width and tooth thickness exceed a specified
wear limit or when the shape error exceeds 1.5 times the allowable error, it shall
consider disposal of the spline gauge.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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