ASME B1 5-1997 Acme Screw Threads《梯形螺纹》.pdf

1、 Intentionally left blank The American Society of Mechanical Engineers AN AMERICAN NATIONAL STANDARD ASME BI.5-1997 (Revision of ASME/ANSI BI.5-1988) Date of Issuance: December 6, 1999 The 1997 edition of this Standard is being issued with an automatic addenda subscription service. The use of an add

2、enda allows revisions made in response to public review comments or committee actions to be published as necessary. The next edition of this Standard is scheduled for publication in 2002. ASME is the registered trademark of The American Society of Mechanical Engineers. This code or standard was deve

3、loped under procedures accredited as meeting the criteria for American National Standards. The Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate. The proposed code or standard w

4、as made available for public review and comment which provides an opportunity for additional public input from industry, academia, regulatory agencies, and the public-at-large. ASME does not “approve,“ “rate,“ or “endorse“ any item, construction, proprietary device, or activity. ASME does not take a

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8、 in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. The American Society of Mechanical Engineers Three Park Avenue, New York, NY 10016-5990 Copyright 1999 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U

9、.S.A. FOREWORD When created prior to 1895, Acme screw threads were intended to replace square threads and a variety of threads of other forms used chiefly for the purpose of traversing motion on machines, tools, etc. Acme screw threads are now extensively used for a variety of purposes. Long-length

10、Acme threads are used for controlled movements on machine tools, testing machines, jacks, aircraft flaps, and conveyors. Short-length threads are used on valve stems, hose connectors, bonnets on pressure cylinders, steering mechanisms, and camera lens movement. The Standards Committee on the Standar

11、dization and Unification of Screw Threads, B 1, was organized in June 1921, with the Society of Automotive Engineers and the American Society of Mechanical Engineers as joint sponsors under the procedure of the American Standards Association (ASA), now the American National Standards Institute (ANSI

12、). This Committee was reorganized in May 1929, and its work was divided among five Subcommittees as follows No. I on Scope and Arrangement of American Standard; No. 2 on Terminology and Form of Thread, Except Gages; No. 3 on Special Threads and Twelve Pitch Series, Except Gages; No. 4 on Acme Thread

13、s, Except Gages; and No. 5 on Screw Thread Gages. National standardization of Acme screw threads in the United States was begun in 1932 when Subcommittee No. 4 on Acme Threads of Standards Committee B I held its first meeting in New York. A report was presented on the types of Acme threads and the r

14、ange of sizes and pitches in use in this country. It was prepared by C. W. Bettcher with the assistance of F. L. Woodcock. This report developed into a draft standard and was finally approved as an American Standard with the designation ASA B1.3-1941. It contained a section of introductory notes, an

15、d tables covering general purpose screws and general purpose nuts, basic dimensions of general purpose Acme threads with special and standard pitches, basic dimensions of 29 deg stub thread, measurements over three wires for Acme threads, basic dimensions of 60 deg stub thread, and basic proportions

16、 for modified square thread. In December 1942, to meet the war emergency, the National Aircraft Standards Committee of the Aeronautical Chamber of Commerce requested the ASA to consider the setting up of an American War Standard for special Acme screw threads for use in aircraft construction. Recogn

17、izing the vital importance of aircraft production to the war effort, the ASA initiated this project at once and organized a Special Committee to develop the Standard. Drafts of this proposed American War Standard were submitted, first on behalf of the National Aircraft Standards Committee and later

18、by D. R. Miller of the National Bureau of Standards. The latter draft, which was submitted also to the Interdepartmental Screw Thread Committee established by the U.S. Departments of War, Navy, and Commerce, served as the basis for the development of the American War Standard. The final draft, dated

19、 November 20, 1944, was unanimously approved by the members of the ASA War Committee on Acme Threads and the General ASA War Committee on Screw Threads. This draft received final ASA approval on January 9, 1945, and was designated American War Standard B 1.5-1945. In April 1946, the Subcommittees of

20、 the Standards Committee were reorganized to take over the job of the ASA War Committees. Subcommittee No. 2 on Acme and Stub Acme Threads revised the War Standard on Acme Screw Threads and, on March 31, 1948, distributed the January 1948 draft to industry for criticism and comment. iii The final dr

21、aft of the proposed revision to the 1945 Edition of this Standard was completed in June 1951. It was submitted to Standards Committee B1 for letter ballot on September 17, 1951, and was approved with minor amendments. Following approval by the sponsor organizations, the proposed Standard was submitt

22、ed to the ASA for approval and designation as an American Standard. This was granted May 7, 1952. The next revision added the no allowance Class 5G thread. Approval by ANSI was granted on March 26, 1973. Corrections were made in the revision approved May 1l, 1977. Data for Classes 5G, 5C, and 6G was

23、 transferred to Appendices D and E for reference, and this revision was approved by ANSI on January 1 l, 1988. The present revision to the Standard includes the addition of gage tables and drawings for Gaging Systems 21, 22, and 23, table changes to conform to ASME Bl.30M, lead and angle tolerances

24、for product threads, measurement uncertainty values for Acme thread gages, and descriptions and drawings for indicating gages. The pitch diameter compensation table and text were deleted and replaced with data on standard gage blanks for gage length with text on pitch diameter adjustment for gage le

25、ngth over two diameters. Table values of gage dimensions for general purpose and centralizing Acme threads were added, along with formulas to determine diameters of multiple-start threads. Recommendation in the use of formulas and examples to calculate pitch diameter measurement over wires was revis

26、ed. Additionally, the Appendix contains revision of alternate centralizing Acme threads and of multiple-start threads, and was expanded to include ball measurement of internal pitch diameter, limit gaging of setting ring gages, gaging of problem areas, Acme tolerances over 5 in., and means for deter

27、mining limits of size for special diameter/pitch combinations. This Standard was approved by the American National Standards Institute on December 9, 1997. ASME STANDARDS COMMITTEE B1 Screw Threads (The following is the roster of the Committee at the time of approval of this Standard.) OFFICERS A.D.

28、 Shepherd, Chair J. IBird, Secretary COMMITTEE PERSONNEL J. R. Anderson, Delphi Harrison Thermal System J. Bird, The American Society of Mechanical Engineers J. M. Bobelak, Boeing R. M. Byrne, Trade Association Management, Inc. D. P. Cadieux, Glastonbury Gage F. G. Calderone, Quality Systems Impleme

29、nters R. Dodge, Pennoyer-Dodge Co. A. E. Ellis, Retired H. W. Ellison, Consultant: R. E. Ferry, R. B. 21 3.8 Standard Centralizing Acme Thread Series . 21 3.9 Classification .and Tolerances, Centralizing Acme Threads . 21 3.10 Basic Diameters 24 3.11 Length of Engagement 24 vii 3.12 Tolerances 24 3.

30、13 Allowances (Minimum Clearance) (es) . 29 3.14 Limits of Size 29 3.15 Thread Designations . 29 3.16 Formulas for Determining Diameters . 29 3.17 Maximum-Material Profile Option 30 4 Gages for General Purpose Acme Threads . 30 4.1 Measurement Uncertainty Estimates 30 4.2 Application . 31 4.3 Gage B

31、lanks 31 4.4 Gage Tolerances 31 4.5 Gages for External Threads 32 4.6 Gages for Internal Threads 46 4.7 ASME B47.1 Gage Blanks 64 5 Gaging for Centralizing Acme Threads . 64 5.1 Gage Tolerances 64 5.2 Gages for External Centralizing Acme Thread 64 5.3 Gages for Internal Centralizing Acme Screw Threa

32、ds . 73 Figures 1 Profile for Acme Screw Thread . 4 2 Design Profile for Extemal and Internal General Purpose Acme Thread 5 3 Disposition of Allowances, Tolerances, and Crest Clearances for General Purpose Single-Start Acme Threads (All Classes) 6 4 Design Profile for External and Internal Centraliz

33、ing Acme Thread 22 5 Disposition of Allowances, Tolerances, and Crest Clearances for Centralizing Single-Start Acme Threads, Classes 2C, 3C, and 4C . 23 6 Gage Acceptance Using Measurement Uncertainty 31 7 Maximum-Material Go Functional Limit for External Thread 37 8 Indicating Thread Gages - Maximu

34、m-Material Go Functional Diameter Limit and Size for External Thread . 38 9 Go Thread Form- Full-Form and Truncated Setting Plug Gage for External Thread 39 10 Not Go Functional Diameter Limit for External Thread . 39 11 Indicating Thread Gages Minimum-Material Pitch Diameter Limit and Size, Cone an

35、d Vee, for External Thread 40 12 Indicating Thread Gages- Minimum-Material Thread Groove Diameter Limit and Size for Extemal Thread . 41 13 Thread Form of Full-Form and Truncated Thread Setting Plug Gage for External Thread Not Go Thread Gage . 42 14 Indicating Plain Diameter Gages - Maximum/Minimum

36、 Major Diameter Limit and Size for Extemal Thread . 43 15 Indicating Diameter Gages Maximum/Minimum Minor Diameter Limit and Size for External Thread 44 16 Indicating Thread Gages- Diameter Runout, Major to Pitch Diameter, for External Thread 45 17 Differential Gaging for External Thread 47 18 Singl

37、e-Thread, Full-Form Indicating Gages- Cone and Vee Helical Segments and Zero Lead Rolls for External Thread 48 viii 19 Maximum-Material Go Functional Limit for Internal Thread 54 20 Indicating Thread Gages Maximum-Material Go Functional Size for Internal Thread . 55 21 Not Go Functional Diameter Lim

38、it for Internal Thread . 56 22 Indicating Thread Gages- Minimum-Material Pitch Diameter Limit and Size, Cone and Vee, for Internal Thread 57 23 Indicating Thread (;ages Minimum-Material Thread Groove Diameter Limit and Size, Ball and Radius, for Internal Thread . 58 24 Thread Form of Solid Thread Se

39、tting Ring Gage for Internal Thread 59 25 Minor Diameter Limit Cylindrical Plug Gages for Internal Thread . 59 26 Indicating Thread (Jages Diameter Runout, Minor to Pitch Diameter, for Internal Thread . 61 27 Differential Gaging for Internal Thread 62 28 Single-Thread, Full-Form Indicating Gages Con

40、e and Vee Helical Segments and Zero Lead Rolls for Internal Thread . 63 29 Indicating Plain Diameter Gages Maximum/Minimum Minor Diameter Limit and Size for Internal Thread 65 30 Indicating Diameter Gages Maximum/Minimum Major Diameter Limit and Size for Internal Thread 66 31 Not Go Thread Plug Gage

41、 for Major Diameter of Centralizing Internal Thread . 78 Tables I General Purpose Acme Screw Thread Form, Design Dimensions 3 2 Basic Diameters and Thread Data fi)r General Purpose Single-Start Acme Screw Threads, Standard Series . 7 3 Tolerances on Major and Minor Diameters of General Purpose Exter

42、nal and Internal Single-Start Threads 9 4 Tolerances and Allowances for Major and Minor Diameters, General Purpose Acme Single-Start Screw Threads . 9 5 Pitch Diameter Tolerances for Single-Start Acme Screw Threads, Classes 2G and 2C 10 6 Pitch Diameter Tolerances for Single-Start Acme Screw Threads

43、, Classes 3G and 3C . 12 7 Pitch Diameter Tolerances for Single-Start Acme Screw Threads, Classes 4G and 4C . 14 8 Tolerances on 14.5 deg Flank Angle for External and Internal Product Threads 16 9 External Pitch Diameter Allowances. (es) for Single-Start Acme Screw Threads . 17 10 Limiting Dimension

44、s and Tolerances for General Purpose Single-Start Acme Screw Threads, Standard Series, Classes 2G, 3G, and 4G 18 11 Centralizing Acme Screw Thread Form, Basic Dimensions 21 12 Centralizing Acme Single-Start Screw Threads, Basic Diameters and Thread Data . 24 13 Tolerances on Major and Minor Diameter

45、s of Single-Start Centralizing External and Internal Threads . 25 14 Tolerances and Allowances for Major Diameter, Centralizing Single-Start Acme Screw Threads . 26 15 Limiting Dimensions and Tolerances for Centralizing Single-Start Acme Screw Threads, Standard Series, Classes 2C, 3C, and 4C . 27 16

46、 Estimated Measurement Uncertainty Values for Screw Thread Gage Elements . 30 17 Tolerances for Go and Not Go Thread Gages, Working and Setting, General Purpose Single-Start Acme Screw Threads (0.250 in. Through 5.000 in.) 32 18 ASME B47.1 Go Gage Blank Lengths 33 19 Go Setting Plug Gages for Workin

47、g Adjustable Ring Gages and Indicating Gages for External Thread and Go Working Plug Gages for Internal Thread, General Purpose Single-Start Acme Screw Threads, Standard Series, Classes 2G, 3G, and 4G 34 20 Not Go Setting Plug Gages for Working Adjustable Ring Gages for External Threads and Not Go W

48、orking Plug Gages for Internal Threads, General Purpose Single-Start Acme Screw Threads, Standard Series, Classes 2G, 3G, and 4G 49 21 Limiting Dimensions, Go and Not Go Working Adjustable Ring Gages for External Threads, General Purpose Single-Start Acme Screw Threads, Standard Series, Classes 2G,

49、3G, and 4G 52 22 Limiting Dimensions, Solid-Setting Thread Ring Gages for Internal Thread Indicating Gages, Single-Start Acme Screw Threads 60 23 Plain Gage Tolerances 60 24 Tolerances for Go and Not Go Thread Gages, Working and Setting, for Centralizing Single-Start Acme Screw Threads (0.250 in. Through 5.000 in.) 67 25 Limiting Dimensions, Go and Not Go Setting Plug Gages for Adjustable Ring and Indicating Gages for External Thread, Centralizing Single-Start Acme Screw Threads, Standard Series, Classes