1、AN AMERICAN NATIONAL STANDARD ASME B5.50-2015(Revision of ASME B5.50-2009)7/24 Taper Tool to Spindle Connection for Automatic Tool ChangeASME B5.50-2015(Revision of ASME B5.50-2009)7/24 Taper Tool toSpindle Connectionfor Automatic ToolChangeAN AMERICAN NATIONAL STANDARDTwo Park Avenue New York, NY 1
2、0016 USADate of Issuance: September 30, 2015This Standard will be revised when the Society approves the issuance of a new edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard. Interpretations are published on the Committee Web page and unde
3、r go.asme.org/InterpsDatabase. Periodically certain actions of the ASME B5 Committee may be published as Cases.Cases are published on the ASME Web site under the B5 Committee Page atgo.asme.org/B5committee as they are issued.Errata to codes and standards may be posted on the ASME Web site under the
4、Committee Pages toprovide corrections to incorrectly published items, or to correct typographical or grammatical errorsin codes and standards. Such errata shall be used on the date posted.The B5 Committee Page can be found at go.asme.org/B5committee. There is an option available toautomatically rece
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6、 standard was developed under procedures accredited as meeting the criteria for American NationalStandards. The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate. The proposed co
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11、 may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical EngineersTwo Park Avenue, New York, NY 10016-5990Copyright 2015 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrin
12、ted in U.S.A.CONTENTSForeword ivCommittee Roster . vCorrespondence With the B5 Committee vi1 General. 12 Essential Dimensions for 7/24 Taper Toolholder Shank 23 Essential Dimensions for Retention Knobs 24 Essential Dimensions for 7/24 Taper Spindle Sockets . 2Figure1 Optional Face-Mount Holes, 7/24
13、Taper Spindle Socket . 2Tables1 Essential Dimensions of Basic Toolholder Shanks for Machining Centers WithAutomatic Tool Changers 32 Essential Dimensions of Retention Knobs . 53 Essential Dimensions of 7/24 Taper Spindle Socket . 7Nonmandatory AppendicesA Useful Technical Information . 9B Excerpt Fr
14、om ISO 1947:1973, System of Cone Tolerances for Conical WorkpiecesFrom C p 1:3 to 1:500 and Lengths From 6 to 630 mm . 11iiiFOREWORDThe Aerospace Industries Association (AIA) developed, in cooperation with machine toolbuilders and users, standards of toolholder shanks and retention knobs for machini
15、ng centerswith automatic tool changers. AIA/NAS 970 was first published in 1964. The objective of thisstandardization effort was to reduce the large number of already existing tool shank configurationsand to prevent the creation of new ones. The toolholder shanks made by different machine toolbuilde
16、rs varied in the methods and in dimensional details of the gripping by the transfer mecha-nism and retention in the machine tool spindle. The resulting lack of interchangeability createdproblems of maintaining large toolholder inventories. The AIA standard covered a series ofstraight and tapered sha
17、nk toolholders, but the standard never found wide acceptance; onereason for this was that standardization attempted too “early in the art” stifled innovation anddevelopment of better tool shanks for machining centers.During the intervening years, almost every machine tool builder continued to develo
18、p its own,often proprietary and very ingenious, toolholder shank configurations for its own machiningcenter. This resulted in an almost unbearable economic situation, where one user had to maintainno less than 28 noninterchangeable tool shank configurations to operate their machining centers,supplie
19、d by the various machine tool builders. These 28 different tool shank configurations shouldbe multiplied by the number of basic sizes to get an understanding of the resulting tool inventoryproblem.A major user of machining centers decided to rectify this situation and developed a tool shankfor machi
20、ning centers. Several major machine tool builders, toolholder manufacturers, and usersof machining centers were approached to discuss and confirm the need and practicality of theirproposed design, and to consider it as a basis for an American National Standard. A technicalcommittee (TC 45) of Americ
21、an National Standards Committee (ANSC) B5, Group C was delegatedto study the proposed tool shank and prepare drafts for an American National Standard.A standard was developed and published in November 1978 as ANSI B5.50-1978. The technicalcommittee followed the policy to establish new standards in S
22、I units with the hope that ISOwould adopt a common worldwide metric standard.After a number of meetings and recommendations, the ISO put forward a recommendationthat would create more than one standard, which would lead to confusion by the addition of anumber of national metric standards. TC 45 of A
23、NSC B5, Group C therefore recommended thatthe 1978 edition of the standard be revised and replaced with a new inch standard to reflectusage in the United States.This Standard specifies the dimensions of toolholder shanks, retention knobs, and sockets, anduseful related technical information for mach
24、ine tool spindles having 7/24 tapers intended forautomatic tool changing. Prior to this Standard, there were no applicable standards specifyingdimensions and tolerances for tool sockets to match the tool shanks in ASME B5.50-1994.In 2009, dimension M in Table 1 was revised to allow for greater manuf
25、acturing flexibility. The2015 revision features elimination of overconstrained tolerances and clarifies dimensions.Suggestions for improvement of this Standard are welcome. They should be sent to the Secretary,B5 Standards Committee, The American Society of Mechanical Engineers, Two Park Avenue,New
26、York, NY 10016-5990.This revision was approved as an American National Standard on May 21, 2015.ivASME B5 COMMITTEEMachine Tools Components, Elements, Performance, andEquipment(The following is the roster of the Committee at the time of approval of this Standard.)STANDARDS COMMITTEE OFFICERSS. G. Wa
27、llace, ChairD. R. Alonzo, SecretarySTANDARDS COMMITTEE PERSONNELD. R. Alonzo, The American Society of Mechanical EngineersJ. A. Babinski, Contributing Member, Thomson Aerospace however, they shouldnot contain proprietary names or information.Requests that are not in this format may be rewritten in t
28、he appropriate format by the Committeeprior to being answered, which may inadvertently change the intent of the original request.ASME procedures provide for reconsideration of any interpretation when or if additionalinformation that might affect an interpretation is available. Further, persons aggri
29、eved by aninterpretation may appeal to the cognizant ASME Committee or Subcommittee. ASME does not“approve,” “certify,” “rate,” or “endorse” any item, construction, proprietary device, or activity.Attending Committee Meetings. The B5 Standards Committee regularly holds meetings and/or telephone conf
30、erences that are open to the public. Persons wishing to attend any meetingand/or telephone conference should contact the Secretary of the B5 Standards Committee. FutureCommittee meeting dates and locations can be found on the Committee Page at go.asme.org/B5committee.viASME B5.50-20157/24 TAPER TOOL
31、 TO SPINDLE CONNECTION FOR AUTOMATICTOOL CHANGE1 GENERAL1.1 ScopeThis Standard pertains to the standardization of basictoolholder shank, retention knob, and socket assembliesfor numerically controlled machining centers with auto-matic tool changers. The requirements contained hereinare intended to p
32、rovide toolholder interchangeabilitybetween machining centers with automatic tool chang-ers of various types. This Standard is the inch solutionfor basic toolholder shank, retention knob, and socketassemblies. This design specifies an interchangeableretention knob with a 45-deg clamping surface.Sect
33、ion 2 of this Standard specifies the dimensionsand tolerances of toolholder shanks having 7/24 tapersintended for automatic tool change. These are intendedfor use with the corresponding basic retention knob andspindle sockets specified in sections 3 and 4 (see Table 1).Section 3 contains information
34、 for standardization ofretention knobs for use with the 7/24 connection systemdescribed herein (see Table 2).Section 4 specifies the dimensions and tolerances ofspindle sockets, drive keys, and key seats for machinetool spindles having 7/24 tapers intended for automatictool change (see Table 3 and F
35、ig. 1). These are intendedfor use with the corresponding basic toolholder shankand retention knob specified in sections 2 and 3.1.2 NoninterchangeabilityTool shanks conforming to ASME B5.18-1972 (R2009)and ASME B5.40-1977 (R2013) are not interchangeablewith tool shanks established in this Standard.
36、Toolshanks conforming to ISO 7388-1:1983 and retentionknobs per ISO 7388-2:1984, types A and B are not inter-changeable with this Standard. This also applies to addi-tional shank and knob designs that are in the draft stageswithin the ISO standards development system. Accord-ingly, the reader should
37、 note the warning statementincluded with the retention knob specifications shownin Table 2.Some incompatibility with existing automatic toolchange arms may arise from dimension M (Table 1).1.3 ClassificationThis Standard covers a basic toolholder shank withan inch threaded retention knob with 45-deg
38、 clampingsurface that is applicable to general-purpose machining1centers where loading and exchange of toolholders areaccomplished by automatic means. The term generalpurpose is intended to differentiate between machinedesigns for unusually high accuracy requirements anddesigns intended to function
39、with exceptionally highspindle rotational speeds coupled with higher axis feedrates, such as is normally found in high-speed machin-ing. Tool shanks made to this Standard may be usedwith a variety of proprietary retention and/or flangelocking systems.1.4 Definitionsautomatic tool changer (ATC): mech
40、anism for the transferof the toolholder between a storage feature and the spin-dle or nonrotating socket.balance: when the mass centerline and rotational center-line of a rotor are coincident.basic cone: geometrically ideal conical surface that isgiven by its geometrical dimensions. These are a basi
41、ccone diameter, the basic cone length, and the basic rateof taper, or the basic cone angle.basic toolholder shank: unit that fits directly into the spin-dle or nonrotating socket of the machine and has provi-sion for automatic tool change.coolant hole: passage through the center of the retentionknob
42、 that allows through-the-spindle coolant to pass.This hole also permits access to a tool set height adjust-ment screw if so equipped.drive key: device intended to assist in delivery of thedriving torque from the spindle nose to the tool.effective case: depth within a metal part, measured fromthe par
43、ts surface, where the minimum required hard-ness is present.retention knob: member of the toolholder retention sys-tem that provides a coupling point between the tool-holder taper and the spindle drawbar.spindle: component assembly of the machine tool, thefunction of which is to accept the basic too
44、lholder shank.spindle nose: the part of a spindle into which the toolshank is accepted.tool angular orientation: mechanical feature to positionand retain the basic toolholder shank in a specific angu-lar relationship to the spindle or nonrotating socket.tool shank: the part of a tool that mates with
45、 the taperin the spindle nose.ASME B5.50-2015Fig. 1 Optional Face-Mount Holes, 7/24 Taper Spindle SocketCCBBSection DD-A-AADD45 deg0.006 A0.008Taper sizes 30, 40, and 45Taper sizes 50 and 60 A1.5 References1.5.1 The following is a list of publications refer-enced in this Standard. A later edition ma
46、y be used,provided there is no conflict with this Standard.ASME B5.18-1972 (R2009), Spindle Noses and ToolShanks for Milling MachinesASME B5.40-1977 (R2013), Spindle Noses and ToolShanks for Horizontal Boring MachinesASME Y14.5-2009, Dimensioning and TolerancingPublisher: The American Society of Mec
47、hanicalEngineers (ASME), Two Park Avenue, New York,NY 10016-5990 (www.asme.org)ISO 1940-1:2003, Mechanical vibration Balance qual-ity requirements for rotors in a constant (rigid) state Part 1: Specification and verification of balancetolerances1ISO 1940-2:1997 (withdrawn), Mechanical vibration Bala
48、nce quality requirements of rigid rotors Part 2:Balance errorsISO 1947:1973 (withdrawn), System of cone tolerancesfor conical workpieces from C p 1:3 to 1:500 andlengths from 6 to 630 mmISO 7388-1:2007, Tool shanks with 7/24 taper for auto-matic tool changers Part 1: Dimensions and desig-nation of s
49、hanks of forms A, AD, AF, U, UD and UF1ISO 7388-2:2007, Tool shanks with 7/24 taper for auto-matic tool changers Part 2: Dimensions and desig-nation of shanks of forms J, JD and JF11May also be obtained from the American National StandardsInstitute (ANSI), 25 West 43rd Street, New York, NY 10036.2Publisher: International Organization forStandardization (ISO), Chemin de Blandonnet 8, CasePostale 401, 1214 Vernier, Geneva, Switzerland(www.iso.org)1.5.2 The following documents are not referencedin this Standard but are relevant to the subject and maybe of interest to the user
