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Position: Chinese Standard in English/GB/T 9239.32-2017
GB/T 9239.32-2017   Mechanical vibration―Rotor balancing―Part 32:Shaft and fitment key convention (English Version)
Standard No.: GB/T 9239.32-2017 Status:valid remind me the status change

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Standard No.: GB/T 9239.32-2017
English Name: Mechanical vibration―Rotor balancing―Part 32:Shaft and fitment key convention
Chinese Name: 机械振动 转子平衡 第32部分:轴与配合件平衡的键准则
Chinese Classification: N73    Mechanical vibration, impact equipment and dynamic balancing machine
Professional Classification: GB    National Standard
ICS Classification: 21.120.40 21.120.40    Balancing and balancing machines 21.120.40
Issued by: AQSIQ;SAC
Issued on: 2017-03-03
Implemented on: 2017-9-1
Status: valid
Superseding:GB/T 16908-1997 Mechanical vibration—Balancing—Shaft and fitment key convention
Language: English
File Format: PDF
Word Count: 8500 words
Price(USD): 210.0
Delivery: via email in 1 business day
GB/T 9239 Mechanical vibration - Rotor balancing consists of the following parts: ——Part 1: Introduction ); ——Part 2: Vocabulary ); ——Part 11: Procedures and tolerances for rotors with rigid behaviour ); ——Part 12: Procedures and tolerances for rotors with flexible behaviour ); ——Part 13: Criteria and safeguards for the in-situ balancing of medium and large rotors ); ——Part 14: Procedures for assessing balance errors ); ——Part 21: Description and evaluation of balancing machines ); ——Part 23: Enclosures and other protective measures for balancing machines ); ——Part 31: Susceptibility and sensitivity of machines to unbalance ); ——Part 32: Shaft and fitment key convention ). This part is Part 32 of GB/T 9239. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 16908-1997 Mechanical vibration - Balancing - Shaft and fitment key convention, the following technical changes have been made with respect to GB/T 16908-1997: ——The standard name is modified; ——Three terms defined in the former standard are deleted (see 3.1~3.3 of Edition 1997). ——Annex B “Transitional countermeasures for half-key convention” is deleted (see Annex B of Edition 1997). This part, by means of translation, is identical to ISO 21940-32:2012 Mechanical vibration - Rotor balancing - Part 32: Shaft and fitment key convention. The Chinese document identical to the normative international document given in this part is as follows: ——GB/T 6444-2008 Mechanical vibration - Balancing vocabulary (ISO 1925:2001, IDT). This part was proposed by and is under the jurisdiction of the Mechanical Vibration Shock and Condition Monitoring (SAC/TC 53). The previous edition replaced by this part is as follows: ——GB/T 16908-1997.   Introduction It is often impossible or economically unreasonable to balance rotors with fitments after they have been assembled; the rotor components which also may originate from different suppliers are therefore balanced separately. An appropriate balance tolerance is applied to each component so that, when shaft and fitment(s) are coupled together, the rotor assembly meets the required balance tolerance and/or vibration limit. If, however, a different key convention has been used when balancing the shaft than that one used for balancing the fitment(s), it is quite likely that the rotor assembly has a balance error influencing its residual unbalance. There are three methods, or key conventions, for balancing shafts and fitments coupled together with keys: ——full-key convention; ——half-key convention; ——no-key convention. ISO 21940-32 adopted in this part unifies the key conventions used throughout the world and gives instructions on a marking of components balanced in accordance with the key convention applied. When consistently used, it results in compatibility of shafts and fitments so that they can be balanced by different suppliers and, after being assembled, the balance tolerance and/or vibration limit for the rotor assembly is met. Mechanical vibration - Rotor balancing - Part 32: Shaft and fitment key convention 1 Scope This part of GB/T 9239 specifies one convention for balancing the individual components (shaft and fitments) of a keyed rotor assembly. This provides compatibility of all balanced components so that when they have been assembled the overall balance tolerance and/or vibration limit for the rotor assembly is met. This part specifies that half-keys be used when balancing the individual components of a keyed rotor assembly. It also specifies a marking of the components balanced in accordance with the key convention used. This part applies to rotors balanced in a balancing machine, in their own bearings or in situ. The key convention can also be applied when measuring the residual unbalance and/or vibration of rotors with keyways, but to which fitments have not yet been assembled. In addition to applying to keys of constant rectangular or square cross-section mounted parallel to the shaft centreline, this part also applies to keys mounted on tapered shaft surfaces, to woodruff, taper, dowel and other special keys. The principle of the half-key convention is applied as is appropriate to the particular shape and location of the special key. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including having amendments) applies to this document. ISO 1925 Mechanical vibration - Balancing - Vocabulary ) 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 1925 apply. 4 Half-key convention This part specifies that the half-key convention be followed. According to this convention, a half-key shall be used in the keyway of the shaft having one keyway while balancing the shaft without the fitment. A complementary half-key shall be used while balancing the corresponding fitment on a balancing mandrel, provided the mandrel has no keyways. If the mandrel has keyways, the methods described in A.1.3 shall be followed. If at one cross-section, shaft and fitment each have two keyways the methods described in A.1.4 shall be followed. The axial location of the centre of gravity of the half-key should be the same as that of the full key in the final assembly. Note: Table 1 shows examples of various types of shaft keyways and full keys of constant rectangular or square cross-section. Practical considerations for making and usage of half-keys are given in Annex B. A contoured half-key set is shown in Figure 1. The use of the half-key convention provides a uniform method for balancing shafts and fitments joined together by keys. It eliminates balance errors and therefore unnecessary residual unbalance and/or vibration which can be caused by the use of different key conventions, and avoids the creation of an internal bending moment in the assembly (as would be caused by the use of full keys during balancing of the shaft). For more information on the differences between the key conventions, see Annex C.   Table 1 Examples of types of shaft keyways and keys Type Configuration of keyway Name of keyway Configuration of key a Name of key A Round/round end Square/square end Round/round end B Round/square end Round/square end Square/square end Round/round end C Sled runner Square/square end l——length of the keyway; d——depth of the keyway. Key: 1——half-key for the fitment; 2——half-key for the shaft. Figure 1 Contoured half-key set 5 Mark 5.1 The end face of the shaft adjacent to the keyway shall be permanently marked with the letter H to indicate that balancing was performed using the half-key convention. Permanent marking using metal stamps or vibratory engravers is recommended, but a permanent or indelible ink may also be used. If the shaft end face is too small for marking, the bottom of the keyway may be used. 5.2 The face of the fitment adjacent to the keyway shall be permanently marked with the letter H to indicate that balancing was performed using the half-key convention. The letter should be readily visible when the fitment is joined to the shaft. Permanent marking using metal stamps or vibratory engravers is recommended, but a permanent or indelible ink may also be used. 5.3 The marking of the shaft and the fitment with the letter H may only be omitted if confusion as to which key convention was used is unlikely. 5.4 When balancing a replacement shaft or fitment, the known mating part of which has not been balanced using the half-key convention, it is permissible to balance the replacement component with the key convention of the existing mating part. In this special case, both components shall be permanently marked with an identification letter corresponding to the key convention used, as follows: a) components balanced using the full-key convention (see C.1.2) shall be marked with the letter F adjacent to the keyway; b) components balanced using the no-key convention (see C.1.4) shall be marked with the letter N adjacent to the keyway. Note 1: For the fitment, the balancing procedures in accordance with the full-key convention and the no-key convention are identical. Marking is done as ordered. Note 2: If fitments are balanced for being put on stock, these fitments may be marked either with F or with N. But since the full-key convention is in use more often, these fitments generally are marked with F. 6 Implementation of the half-key convention All manufacturers of original parts and processed components shall comply with the half-key convention of balancing and mark each newly manufactured shaft and fitment with the letter H. Note: Some International Standards prescribe that the half-key convention be followed, e.g. IEC 60034-14 [1]. Change-over of equipment in service to the half-key convention with proper marking of the shaft and fitment(s) during a repair balancing operation is encouraged. In any case, a marking shall be added (see Clause 5).
Foreword i Introduction iii 1 Scope 2 Normative references 3 Terms and definitions 4 Half-key convention 5 Mark 6 Implementation of the half-key convention Annex A (Informative) Specifications for the half-key convention Annex B (Informative) Practical considerations for making half-keys and usage of keys Annex C (informative) Comparison between shaft and fitment key conventions Bibliography
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*GB/T 711-2017 Hot-rolled Quality Carbon Structural Steel Plates, Sheets and Wide Strips
*GB/T 8059-2016 Household and similar refrigerating appliances
*DB11/T 779-2011 Testing code of operation for security and protection system (Beijing)
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*DB11/1024-2013 Standard on Fire Safety Evacuation Signs Installation (excluding Explanation of Provisions)
*GB/T 3185-2016 Zinc oxide ( Indirect method)
*04G101-4 Cast-in-place R.C. floor plate and roof sheathing, applicable to such major structures as concrete structure and masonry structure
*HG 20601-1997 Steel pipe blank flanges (Europe System)
*GB 5009.28-2016 National Food Safety Standard — Determination of Benzoic Acid, Sorbic Acid and Saccharin Sodium in Foods
*GB 23200.9-2016 National food safety standard―Determination of 475 pesticides and related chemicals residues in grains Gas chromatography-mass spectrometry
*GB 23200.8-2016 National food safety standard―Determination of 500 pesticides and related chemicals residues in fruits and vegetables Gas chromatography-mass spectrometry
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*GB/T 2779-2009 Tractor’s connective equipment for trailers—Types dimensions and mounting requirement
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*GB/T 23333-2009 Evaporative air cooler
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*GA 260-2009 Police uniform—Multifunctional uniform
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*GA 261-2009 Police uniform.Spring-autumn and winter costume for man
*HG/T 2581.2-2009 Rubber - or plastics - coated fabrics - Determination of tear resistance - Part 2 : Ballistic pendulum method
*JC/T 620-2009 Sampling method of lime
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*SL 443-2009 Specification for hydrometric cableway surveying
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*NY 1428-2007 Water - Soluble Fertilizers Containing Micronutrients
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Code of China
Standard
GB/T 9239.32-2017  Mechanical vibration―Rotor balancing―Part 32:Shaft and fitment key convention (English Version)
Standard No.GB/T 9239.32-2017
Statusvalid
LanguageEnglish
File FormatPDF
Word Count8500 words
Price(USD)210.0
Implemented on2017-9-1
Deliveryvia email in 1 business day
Detail of GB/T 9239.32-2017
Standard No.
GB/T 9239.32-2017
English Name
Mechanical vibration―Rotor balancing―Part 32:Shaft and fitment key convention
Chinese Name
机械振动 转子平衡 第32部分:轴与配合件平衡的键准则
Chinese Classification
N73
Professional Classification
GB
ICS Classification
Issued by
AQSIQ;SAC
Issued on
2017-03-03
Implemented on
2017-9-1
Status
valid
Superseded by
Superseded on
Abolished on
Superseding
GB/T 16908-1997 Mechanical vibration—Balancing—Shaft and fitment key convention
Language
English
File Format
PDF
Word Count
8500 words
Price(USD)
210.0
Keywords
GB/T 9239.32-2017, GB 9239.32-2017, GBT 9239.32-2017, GB/T9239.32-2017, GB/T 9239.32, GB/T9239.32, GB9239.32-2017, GB 9239.32, GB9239.32, GBT9239.32-2017, GBT 9239.32, GBT9239.32
Introduction of GB/T 9239.32-2017
GB/T 9239 Mechanical vibration - Rotor balancing consists of the following parts: ——Part 1: Introduction ); ——Part 2: Vocabulary ); ——Part 11: Procedures and tolerances for rotors with rigid behaviour ); ——Part 12: Procedures and tolerances for rotors with flexible behaviour ); ——Part 13: Criteria and safeguards for the in-situ balancing of medium and large rotors ); ——Part 14: Procedures for assessing balance errors ); ——Part 21: Description and evaluation of balancing machines ); ——Part 23: Enclosures and other protective measures for balancing machines ); ——Part 31: Susceptibility and sensitivity of machines to unbalance ); ——Part 32: Shaft and fitment key convention ). This part is Part 32 of GB/T 9239. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 16908-1997 Mechanical vibration - Balancing - Shaft and fitment key convention, the following technical changes have been made with respect to GB/T 16908-1997: ——The standard name is modified; ——Three terms defined in the former standard are deleted (see 3.1~3.3 of Edition 1997). ——Annex B “Transitional countermeasures for half-key convention” is deleted (see Annex B of Edition 1997). This part, by means of translation, is identical to ISO 21940-32:2012 Mechanical vibration - Rotor balancing - Part 32: Shaft and fitment key convention. The Chinese document identical to the normative international document given in this part is as follows: ——GB/T 6444-2008 Mechanical vibration - Balancing vocabulary (ISO 1925:2001, IDT). This part was proposed by and is under the jurisdiction of the Mechanical Vibration Shock and Condition Monitoring (SAC/TC 53). The previous edition replaced by this part is as follows: ——GB/T 16908-1997.   Introduction It is often impossible or economically unreasonable to balance rotors with fitments after they have been assembled; the rotor components which also may originate from different suppliers are therefore balanced separately. An appropriate balance tolerance is applied to each component so that, when shaft and fitment(s) are coupled together, the rotor assembly meets the required balance tolerance and/or vibration limit. If, however, a different key convention has been used when balancing the shaft than that one used for balancing the fitment(s), it is quite likely that the rotor assembly has a balance error influencing its residual unbalance. There are three methods, or key conventions, for balancing shafts and fitments coupled together with keys: ——full-key convention; ——half-key convention; ——no-key convention. ISO 21940-32 adopted in this part unifies the key conventions used throughout the world and gives instructions on a marking of components balanced in accordance with the key convention applied. When consistently used, it results in compatibility of shafts and fitments so that they can be balanced by different suppliers and, after being assembled, the balance tolerance and/or vibration limit for the rotor assembly is met. Mechanical vibration - Rotor balancing - Part 32: Shaft and fitment key convention 1 Scope This part of GB/T 9239 specifies one convention for balancing the individual components (shaft and fitments) of a keyed rotor assembly. This provides compatibility of all balanced components so that when they have been assembled the overall balance tolerance and/or vibration limit for the rotor assembly is met. This part specifies that half-keys be used when balancing the individual components of a keyed rotor assembly. It also specifies a marking of the components balanced in accordance with the key convention used. This part applies to rotors balanced in a balancing machine, in their own bearings or in situ. The key convention can also be applied when measuring the residual unbalance and/or vibration of rotors with keyways, but to which fitments have not yet been assembled. In addition to applying to keys of constant rectangular or square cross-section mounted parallel to the shaft centreline, this part also applies to keys mounted on tapered shaft surfaces, to woodruff, taper, dowel and other special keys. The principle of the half-key convention is applied as is appropriate to the particular shape and location of the special key. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including having amendments) applies to this document. ISO 1925 Mechanical vibration - Balancing - Vocabulary ) 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 1925 apply. 4 Half-key convention This part specifies that the half-key convention be followed. According to this convention, a half-key shall be used in the keyway of the shaft having one keyway while balancing the shaft without the fitment. A complementary half-key shall be used while balancing the corresponding fitment on a balancing mandrel, provided the mandrel has no keyways. If the mandrel has keyways, the methods described in A.1.3 shall be followed. If at one cross-section, shaft and fitment each have two keyways the methods described in A.1.4 shall be followed. The axial location of the centre of gravity of the half-key should be the same as that of the full key in the final assembly. Note: Table 1 shows examples of various types of shaft keyways and full keys of constant rectangular or square cross-section. Practical considerations for making and usage of half-keys are given in Annex B. A contoured half-key set is shown in Figure 1. The use of the half-key convention provides a uniform method for balancing shafts and fitments joined together by keys. It eliminates balance errors and therefore unnecessary residual unbalance and/or vibration which can be caused by the use of different key conventions, and avoids the creation of an internal bending moment in the assembly (as would be caused by the use of full keys during balancing of the shaft). For more information on the differences between the key conventions, see Annex C.   Table 1 Examples of types of shaft keyways and keys Type Configuration of keyway Name of keyway Configuration of key a Name of key A Round/round end Square/square end Round/round end B Round/square end Round/square end Square/square end Round/round end C Sled runner Square/square end l——length of the keyway; d——depth of the keyway. Key: 1——half-key for the fitment; 2——half-key for the shaft. Figure 1 Contoured half-key set 5 Mark 5.1 The end face of the shaft adjacent to the keyway shall be permanently marked with the letter H to indicate that balancing was performed using the half-key convention. Permanent marking using metal stamps or vibratory engravers is recommended, but a permanent or indelible ink may also be used. If the shaft end face is too small for marking, the bottom of the keyway may be used. 5.2 The face of the fitment adjacent to the keyway shall be permanently marked with the letter H to indicate that balancing was performed using the half-key convention. The letter should be readily visible when the fitment is joined to the shaft. Permanent marking using metal stamps or vibratory engravers is recommended, but a permanent or indelible ink may also be used. 5.3 The marking of the shaft and the fitment with the letter H may only be omitted if confusion as to which key convention was used is unlikely. 5.4 When balancing a replacement shaft or fitment, the known mating part of which has not been balanced using the half-key convention, it is permissible to balance the replacement component with the key convention of the existing mating part. In this special case, both components shall be permanently marked with an identification letter corresponding to the key convention used, as follows: a) components balanced using the full-key convention (see C.1.2) shall be marked with the letter F adjacent to the keyway; b) components balanced using the no-key convention (see C.1.4) shall be marked with the letter N adjacent to the keyway. Note 1: For the fitment, the balancing procedures in accordance with the full-key convention and the no-key convention are identical. Marking is done as ordered. Note 2: If fitments are balanced for being put on stock, these fitments may be marked either with F or with N. But since the full-key convention is in use more often, these fitments generally are marked with F. 6 Implementation of the half-key convention All manufacturers of original parts and processed components shall comply with the half-key convention of balancing and mark each newly manufactured shaft and fitment with the letter H. Note: Some International Standards prescribe that the half-key convention be followed, e.g. IEC 60034-14 [1]. Change-over of equipment in service to the half-key convention with proper marking of the shaft and fitment(s) during a repair balancing operation is encouraged. In any case, a marking shall be added (see Clause 5).
Contents of GB/T 9239.32-2017
Foreword i Introduction iii 1 Scope 2 Normative references 3 Terms and definitions 4 Half-key convention 5 Mark 6 Implementation of the half-key convention Annex A (Informative) Specifications for the half-key convention Annex B (Informative) Practical considerations for making half-keys and usage of keys Annex C (informative) Comparison between shaft and fitment key conventions Bibliography
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Keywords:
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