ISO 14104:2017
(Main)Gears — Surface temper etch inspection after grinding, chemical method
Gears — Surface temper etch inspection after grinding, chemical method
ISO 14104:2017 specifies procedures and requirements for the detection and classification of localized overheating on ground surfaces by chemical etch methods. The process described in this document is typically used on ground surfaces; however, it is also useful for the detection of surface anomalies that result from post-heat treatment machining such as hard turning, milling and edge breaking (deburring) processes. Surface metallurgical anomalies caused by carburization or decarburization are also readily detectable with this process. Some methods which have been used in the past are no longer recommended. Specifications are intended to be changed to use the methods in this document. These etching methods are more sensitive to changes in surface hardness than most hardness testing methods. ISO 14104:2017 applies to steel parts such as gears, shafts, splines and bearings. It is not applicable to nitrided parts and stainless steels. NOTE This process, although at times called "nital etch", is not intended to be confused with other processes also known as "nital etch". The surface temper etch procedure is performed after grinding and before additional finishing operations such as superfinishing, shot peening and honing.
Engrenages — Contrôle par attaque chimique des zones surchauffées lors de la rectification
L'ISO 14104:2017 spécifie les procédures et les exigences pour la détection et la classification des zones surchauffées localement des surfaces rectifiées par attaque chimique à l'acide. Le procédé décrit dans l'ISO 14104:2017 est habituellement utilisé sur des surfaces rectifiées, cependant il est également utile pour la détection des anomalies de surface résultant d'un usinage après traitement thermique tel que des procédés de tournage dur, de fraisage et d'ébavurage. Les anomalies métallurgiques de surface provoquées par la carburation ou la décarburation sont elles aussi facilement détectables par ce procédé. Certaines méthodes qui avaient été utilisées par le passé ne sont plus recommandées. Les spécifications sont destinées à être modifiées pour employer les méthodes du présent document. Ces méthodes d'attaque à l'acide sont plus sensibles aux changements de dureté de surface que la plupart des méthodes d'essai de dureté. L'ISO 14104:2017 s'applique aux pièces en acier telles que les engrenages, les arbres, les cannelures et les roulements. Elle ne s'applique pas aux pièces nitrurées ni aux aciers inoxydables. NOTE Il convient de ne pas confondre ce procédé, parfois appelé «attaque au nital» avec d'autres procédés également connus sous ce terme. La méthode d'inspection des surfaces par attaque à l'acide est réalisée après rectification et avant toute autre opération de finition supplémentaire, telle que superfinition, grenaillage et «honing».
Zobniki - Preskušanje zobnih bokov po brušenju na prežig, kemijska metoda
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2020
Zobniki - Preskušanje zobnih bokov po brušenju na prežig, kemijska metoda
Gears - Surface temper etch inspection after grinding, chemical method
Engrenages - Contrôle par attaque chimique des zones surchauffées lors de la
rectification
Ta slovenski standard je istoveten z: ISO 14104:2017
ICS:
21.200 Gonila Gears
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
INTERNATIONAL ISO
STANDARD 14104
Third edition
2017-04
Gears — Surface temper etch
inspection after grinding, chemical
method
Engrenages — Contrôle par attaque chimique des zones surchauffées
lors de la rectification
Reference number
©
ISO 2017
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus . 1
5 Reagents . 2
6 Procedure. 3
6.1 General . 3
6.2 Cleaning . 4
6.3 Etching . 6
7 Inspection criteria . 8
7.1 Visual appearance and classification . 8
7.2 Surface hardness effects . 8
8 Temper etch discoloration removal . 8
9 Rework of surface-tempered parts . 9
10 Operator qualification . 9
11 Maintenance and control . 9
12 Safety and environmental precautions .15
13 Specifications and documentation .16
13.1 Specifications.16
13.2 Documentation .16
Bibliography .17
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO’s adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: w w w . i s o .org/ iso/ foreword .html.
The committee responsible for this document is ISO/TC 60, Gears, Subcommittee SC 2, Gear capacity
calculation.
This third edition cancels and replaces the second edition (ISO 14104:2014), which has been technically
revised. The changes of the corrected version have been incorporated as well as adoptions in the
cleaning method of etching procedures shown in Tables 2 and 3.
iv © ISO 2017 – All rights reserved
Introduction
This document explains the materials and procedures necessary to determine, evaluate and describe
localized overheating on ground surfaces. A system to describe and classify the indications produced
during this inspection is included. However, specific acceptance or rejection criteria are not contained.
An industry-wide survey was conducted to establish common solutions in time that were acceptable
to the greatest number of users. The safety and environmental precautions were included therein for
those not familiar with storage, handling, use and disposal of concentrated acids, alkalis and solvents.
These precautions, however, do not supersede the latest applicable requirements.
INTERNATIONAL STANDARD ISO 14104:2017(E)
Gears — Surface temper etch inspection after grinding,
chemical method
1 Scope
This document specifies procedures and requirements for the detection and classification of localized
overheating on ground surfaces by chemical etch methods.
The process described in this document is typically used on ground surfaces; however, it is also useful
for the detection of surface anomalies that result from post-heat treatment machining such as hard
turning, milling and edge breaking (deburring) processes. Surface metallurgical anomalies caused by
carburization or decarburization are also readily detectable with this process.
Some methods which have been used in the past are no longer recommended. Specifications are
intended to be changed to use the methods in this document. These etching methods are more sensitive
to changes in surface hardness than most hardness testing methods.
This document applies to steel parts such as gears, shafts, splines and bearings. It is not applicable to
nitrided parts and stainless steels.
NOTE This process, although at times called “nital etch”, is not intended to be confused with other processes
also known as “nital etch”.
The surface temper etch procedure is performed after grinding and before additional finishing
operations such as superfinishing, shot peening and honing.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
4 Apparatus
4.1 Container materials.
Container materials shall not react with the solutions contained, nor damage the parts to be processed.
All containers should be labelled with the solution contained and covered when not in use. Containers
should be labelled according to local regulations.
4.2 Inspection area.
The area to be inspected shall be sufficiently illuminated to be free of shadows and reflections. A
minimum light intensity of 2 200 lx (~200 foot candles) at the inspection level is recommended.
4.3 Cleaner.
An alkaline cleaner, vapour degreaser, solvent wash or equivalent cleaning process shall be used.
4.4 Timing device.
A suitable timing device shall be used for the uniform processing of all parts in a group.
4.5 Grey scale reference.
A suitable grey scale reference should be used, such as Tiffen Color Separation Guide and Gray Scale
1)
Q13 (small) or Q14 (large) .
Figure 1 is an example of a suitable grey scale reference. Use of a sample part with known indications to
exhibit surface tempering is also recommended.
Figure 1 is an approximate reproduction of a commercially available grey scale. The reproduction
shown in this image is not accurate due to variance in graphic reproduction quality and is provided for
reference only. It shall not be used for inspection in conformity with this document.
The grey scale card should be replaced at regular intervals.
Figure 1 — Gray scale card (reprinted with the permission of The Tiffen Company)
5 Reagents
All chemicals shall be technical grade or better.
5.1 Cleaning materials, which ensure removal of all dirt, grit, grease and oil, to obtain a “water break”-
free surface. A “water break”-free surface is one which maintains a continuous water film for a minimum
period of 15 s after having been rinsed in clean water at a temperature below 40 °C.
5.2 Nitric acid.
See Tables 2 and 3.
5.3 Hydrochloric acid.
See Tables 2 and 3.
1) Tiffen Gray Scale is the trade name of a product supplied by Tiffen. This information is given for the convenience
of users of this document and does not constitute an endorsement by ISO of the product named. Equivalent products
may be used if they can be shown to lead to the same results.
2 © ISO 2017 – All rights reserved
5.4 Alcohol, methanol or denatured ethanol, clean and free of contaminants such as oil.
5.5 Water, clean and free of contaminants. Distilled water preferred, but not required.
5.6 Alkaline solution, a solution such as 4 % to 6 % sodium hydroxide in water with a minimum pH
value of 10 or equivalent.
5.7 Rust-preventive oil, suitable for displacing water and which does not mask the results of etching.
6 Procedure
6.1 General
As shown in Figure 2, clean the part first (see 6.2 and Table 1) then etch it using one of the procedures
shown in either Table 2 or Table 3, whichever is appropriate for the type of steel being inspected. Unless
otherwise specified,
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.