GB/T 3478.5-2008Straight cylindrical involute splines -- Metric module, side fit -- Part 5: Inspection (English PDF)

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.

5.2 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.

6.1 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.

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