GB/T 17587.3-2017Ball screws -- Part 3: Acceptance conditions and acceptance tests (English PDF)

Foreword

GB/T 17587 "Ball screw" is divided into the following five parts.

- Part 1. Vocabulary and designation;

- Part 2. Nominal diameters and nominal leads - Metric series;

- Part 3. Acceptance conditions and acceptance tests;

- Part 4. Static axial rigidity;

- Part 5. Static and dynamic load ratings and operational life.

This part is part 3 of GB/T 17587.

This part was drafted in accordance with the rules given in GB/T 1.1-2009.

This part replaces GB/T 17587.3-1998 "Ball screws - Part 3. Acceptance

conditions and acceptance tests". As compared with GB/T 17587.3-1998, the

main technical changes are as follows.

- In the "4.1 classification", CHANGE the 7 standard tolerance grades into 8

standard tolerance grades, ADD the standard tolerance grade 0 in Table 1.

Thereafter any part related to the standard tolerance grade and test item

permissible deviation will be added with the standard tolerance grade 0 and

the corresponding permissible deviation;

- In "4.2.1 Tolerance", ADD the calculation formula of the travel variation

tolerance vup within the useful travel of the grade 0 accuracy;

- CHANGE the "4.2.2 Travel deviation" of 1998 version into "5.1 Overview";

ADD a new table in clause 5.1; CHANGE the Table 2 of the 1998 version

into Table 3;

- CHANGE the "4.2.3 Calculation of measurement drawings" of the 1998

version into "4.2.2 Assessment of measurement drawings"; ADD "4.2.2.1

Overview"; CHANGE the original 4.2.3.1 and 4.2.3.2 into 4.2.2.2 and 4.2.2.3;

- MODIFY the Figure 2 in clause 5.1. CHANGE the "permissible deviation ="

into "permissible deviation <=". ADD the figures and guide line 4 indicating

the travel measuring device which is lacked in the original Figure;

- MODIFY the clause 5.1, 5.2 and 5.3, respectively, of the 1998 version into

5.2, 5.3 and 5.4; DELETE the Table 3, Table 4 and Table 5 in the 1998

version which are shared by many items into one table for each test item;

- CHANGE the "Mean travel deviation e" in the test item E1.1 and E1.2 of the

1998 version into the "Mean travel deviation esa and e0a" AND the "Mean

travel deviation e0a" in the test item E1.2;

- MODIFY the test formula of the permissible deviation in the test item E1.2;

- In the inspection descriptions of the test item E4, ADD that "the letter n in

the diagram represents the number of rotations of the ball screw as

corresponding to the ball nut";

- CHANGE the test item E6, E7, and E8 of the 1998 version, respectively,

into E6.1, E7.1 and E8.1; ADD the test item E6.2, E7.2, and E8.2; in the

diagram of E8.1, ADD the indicator and the formula to assess the inspection

results;

- DIVIDE the permissible deviation column of the test item E12 into two

conditions. lu <= 4000 mm and lu > 4000 mm; ADD the permissible deviation

lu > 4000 mm; DELETE the notes on lu > 3000 mm in the permissible

deviation column of the 1998 version; CHANGE the "Ball screw (both ends

without seals)" in the inspection descriptions of the 1998 version into "Ball

screw (both ends with/without seals)";

- MODIFY the title and the "Tolerance on specified travel" in the Table A.1 of

Appendix A into "The tolerance value within the specified travel";

- MODIFY the Table A.3 in Appendix A; DELETE the note below the original

table.

This part, through the redrafting methods, modifies and adopts ISO 3408-

4 standard tolerance grade and the corresponding permissible deviation are

added;

- In "4.2.1 Tolerance", same as GB/T 17587.1-1998, ADD the calculation

formula of the travel variation vup within the grade 2 and grade 4 accuracy

useful travel;

- MAKE the following changes of the Figure 2 in clause 5.1. CHANGE the

"permissible deviation =" into "permissible deviation <="; ADD the figure

indicating the travel measuring device; INDICATE its guide line 4 again;

- In the test descriptions of the test item E4, ADD that "the letter n in the

diagram represents the number of rotations of the ball screw as

corresponding to the ball nut";

- In the test item E5, same as GB/T 17587.1-1998, in note 1, ADD that "at

this time l1 is the ball screw shaft total length";

- In the test items E6.1, E7.1 and E8.1, same as in E6, E7 and E8 in GB/T

17587.1-1998, ADD the note to the table that "it is agreed to allow the ball

screw shaft top to be measured at the center hole";

- In Appendix A, taking into account the ball screw of nominal lead 4, 6, 8, 12,

16 is widely used, same as the Table A.2 in GB/T 17587.1-1998, ADD the

specifications of the nominal lead, CHANGE the "Lead" in the table into

"Nominal lead", CHANGE "Ph" into "Ph0";

- In Table A.3 of Appendix A, taking into account that the specification of

nominal lead is modified in Table A.2, the original Table A.3 is modified

accordingly.

This part makes the following editorial changes of ISO 3408-3.2006.

- In the "4.2.1 Tolerance" and the note to Table A.1 in Appendix A, for the

determination method of the tolerance on specified travel ep in the useful

travel, CHANGE it from the descriptions without differentiating the accuracy

grade into the descriptions based on grade 0 accuracy and based on other

accuracy grades;

- MOVE the note to the arrow below the esa and e0a of Figure 3b) in clause

1 Scope

This part of GB/T 17587 specifies the technical acceptance conditions for ball

screws (SEE Figure 1), in particular, the respective permissible deviations for

the acceptance tests.

Note. The actual structure need not necessarily be consistent with the structure shown in Figure

1.

The required test items shall be agreed upon by the manufacturer and user.

This part applies to machine tool ball screw, the other can also make reference

to it.

2 Normative references

The following documents are essential to the application of this document. For

the dated documents, only the versions with the dates indicated are applicable

to this document; for the undated documents, only the latest version (including

all the amendments) are applicable to this standard.

GB/T 1800.1-2009 Geometrical product specifications (GPS) - Limits and fits

- Part 1. Bases of tolerances deviations and fits (ISO 286-1.1988, MOD)

GB/T 17421.1-1998 Test code for machine tools - Part 1. Geometric

accuracy of machines operating under no-load or finishing conditions (eqv

ISO230-1.1996)

GB/T 17587.1-2017 Ball screws - Part 1. Vocabulary and designation (ISO

3408-1.2006, MOD)

3 Terms and definitions

The terms and definitions as defined in GB/T 17587.1-2017 apply to this

document.

Where.

ea - Actual mean travel deviation as relative to the specified travel or the

nominal travel;

gamma - The angle of rotation of the ball nut as relative to the ball screw shaft

(specified travel or nominal travel, as appropriate);

gammai - The angle of rotation of i-th measurement point (it can also be as relative

to the specified travel or nominal travel, as appropriate, of the i-th

measurement point);

ei - Travel deviation of the specified travel or nominal travel corresponding

to the i-th measurement point;

n - The number of measurement points.