NZQA registered unit standard
19741 version 3
Page 1 of 4
Title
Demonstrate knowledge of common die casting defects
Level
2
Credits
5
Purpose
People credited with this unit standard are able to: identify and
describe common die casting defects; check castings for defects
during manufacture; and scrap defective castings.
Classification
Mechanical Engineering > Metal Casting
Available grade
Achieved
Explanatory notes
1
References
Health and Safety in Employment Act 1992;
Resource Management Act 1991;
Hazardous Substances and New Organisms Act 1996;
Health and Safety Guidelines on the Management of Hazards in the Metal Casting
Industry. New Zealand: Casting Technology NZ Inc and Occupational Safety and
Health (OSH), 1997. Available at:
http://www.osh.dol.govt.nz/order/catalogue/ipp/metalcasting.pdf.
2
Definition
Worksite procedures – operational procedures put in place by the candidate’s
employer. These include site safety procedures, equipment operating procedures,
job procedures, and procedures for the handling and disposal of materials and waste.
3
Assessment Information
a
All activities must comply with relevant legislative and/or regulatory
requirements, which include, but are not limited to those listed in the references.
b
All work practices must meet documented worksite procedures (where these
exceed code) for personal, product and worksite safety.
c
This unit standard is for operators of a die casting manufacturing process.
Operators need to be able to recognise common defects to ensure product
quality at all stages of the manufacturing process. Product defects caused by
the die casting process may become apparent at different stages of
manufacture as a result of other processes, eg chemical pre-treatment, or
machining. At this level operators are not required to identify the specific cause
of the defect or know how to rectify faults in machinery or procedure.
4
Range
a
Defects in die-casting depend on the procedure. Defects common to all
procedures may include the following: surface defects; laminations; cold skin;
explosions; flashing; bubbles; cracks; solder or carbon build up; pin push;
drags; porosity; fill; and stained, bent or warped castings.
Competenz
SSB Code 101571
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
b
c
19741 version 3
Page 2 of 4
The material used in die casting is non-ferrous metal.
The stages of a typical process for the manufacture of die-cast products may
include; die casting, heat treatment, non destructive testing (x-ray/dye
penetrant), machining, shot blasting, linishing, vibro, polishing, pre-treatment,
powder coating, anodising or electroplating, and assembly.
Outcomes and evidence requirements
Outcome 1
Identify and describe common die casting defects.
Evidence requirements
1.1
Common defects which may occur in the die casting process are identified.
Range
at least five defects.
1.2
Defects are described using accepted industry terms that are in accordance
with worksite procedures.
1.3
Indicators of acceptable product quality range are described for selected die
cast products in accordance with worksite procedures.
Range
for the identified five defects;
indicators may include but are not limited to – colour, shape,
surface; and type, size, and location on product of any defects.
Outcome 2
Check castings for defects during manufacture.
Evidence requirements
2.1
Inspection processes are performed in accordance with worksite procedures.
Range
2.2
may include but is not limited to – visual check of first-off castings,
periodic sample checks, checks against sample boards, 100%
checks.
Any defects are identified and reported to machine operator and/or supervisor in
accordance with worksite procedures.
Range
Competenz
SSB Code 101571
type and quantity of defects.
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
19741 version 3
Page 3 of 4
Outcome 3
Scrap defective castings.
Evidence requirements
3.1
Defective castings are scrapped in accordance with worksite procedures.
3.2
Documentation and/or electronic data input for reporting scrap is completed in
accordance with worksite procedures.
Range
water or oil.
Planned review date
31 December 2014
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
18 December 2002
31 December 2012
Review
2
19 May 2006
N/A
Rollover and
Revision
3
17 November 2011
N/A
Consent and Moderation Requirements (CMR) reference
0013
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMR). The
CMR also includes useful information about special requirements for organisations wishing
to develop education and training programmes, such as minimum qualifications for tutors
and assessors, and special resource requirements.
Competenz
SSB Code 101571
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
19741 version 3
Page 4 of 4
Comments on this unit standard
Please contact Competenz qualifications@competenz.org.nz if you wish to suggest
changes to the content of this unit standard.
Competenz
SSB Code 101571
 New Zealand Qualifications Authority 2016