WORK INSTRUCTION FOR IN-COMING DM-WI-QC-06 / REV-00
INSPECTION
WORK INSTRUCTION
FOR INPROCESS INSPECTION
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1. PURPOSE
The purpose of this procedure is to provide for a system and instructions, and to assign responsibilities
for performing and recording in-process product verification, and in particular:
- Job set-up verification,
- Process performance monitoring,
- Visual inspections (appearance items)
- In-process inspections.
2. APPLICATION
This procedure applies to materials, components, and subassemblies in the course of processing,
manufacturing, and assembly.
This procedure directly concerns the Production and Quality Control departments.
3. PROCEDURE
The program of in-process product verification consists of verification of job set-ups (first
article inspection), statistical process control, visual inspections and, when necessary, in-
process inspections. The program is defined and documented in the Production Control Plan.
It is the policy of DESMECH PRIVATE LIMITED to concentrate resources and attention on defect
prevention, rather than defect detection.
The verification effort is focused on control of processes. Normally, in-process inspections are carried
out for the purpose of collecting data for process performance monitoring (control charts).
In-process inspections for the purpose of detecting and segregating nonconforming product are only
specified when processes are not capable and/or are not sufficiently stable.
Whenever processing equipment or machines are reset for any reason (for example,
maintenance, repair, product change, etc.) and are then set up again for production, the set-up
is verified before the production is resumed. To verify the set-up, a number of parts are
produced and measured, and the results are plotted on a control chart. The number of parts
required is of a subgroup size used for SPC.
The set-up can be approved for production when none of the plotted points are closer to a control
limit than one-third of the control limit zone (i.e. when all points are within the centre on-third
zone width between the control limits).
If the plotted points are closer to a control limit than one-third of the control zone width, the
process is adjusted and a new subset is produced, measured, and plotted. When required, the
Production Engineer assists with adjusting the process.
Approval of job set-up for production is recorded on the control charts used for the set- up
verification. The set-up control charts are stored and retained together with production charts.
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All processes responsible for Special Characteristics are continuously monitored using SPC
methods. In-process inspection is used for measuring the monitored product characteristics.
Operators of processes responsible for colour, grain or texture of parts classified as
“Appearance Items” inspect appearance of the parts against approved masters.
Colour masters are protected from direct light whenever possible, and when not in use are
covered up or are stored in boxes. All appearance masters are periodically checked and
recertified (frequency depends on durability, and is determined either by QA or the customer).
Work stations where appearance evaluation is carried out are equipped with appropriate
lighting to simulate outdoor, interior, or other lighting conditions as specified by the customer.
4. FLOW CHART
Flow Chart Responsible Notes Record
Purchased Product Receiving Receiving transfer the Receiving Log
transferred from incoming products to QC.
Receiving
QC
Perform Receiving Collect the inspection QC Status Log
Inspection standards, related jig or QC Inspection Report
fixtures, gages.
Meet the spec.? QC Conduct inspection
No against inspection
standards.
Fill out the Form with IQC Inspection Report
Forward the Non- QC
Yes attached QC Reports and
conforming to SCM
forward the non-
conforming to SCM for
disposition.
Complete and file
the Inspection QC
Identify the passed QC Inspection Report
Reports
products with labels or
stamps.
Material Material Transfer Form
Transfer to Management
Inventory
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