DDS Quality Assurance Policy

To supply the highest suspension quality that satisfies and exceeds our customers expectations and wins their confidence.

Quality Targets
1. No.1 in Customer Satisfaction
2. Zero critical claims
3. Reduction in general claims by 1/3 each year

 

1. DDS QA System Outline
  • By consolidating quality information from material incoming to product outgoing applying MES (Manufacturing Execution System), POP (Point of Production= Production control system) and our QIS (quality information system), we can analyze and study quality in real time.
  • Quality and production control information can be utilized as a consolidated system. Thus, we can search out root causes immediately by linking to production control information such as production date, equipment, quantity and material.

 

2. SPC (Static Process Control)
SPC is one method employed to maintain product quality at certain levels by continuously controlling (dispersion, average) quality information. NHK applies SPC control inside suspension processes.
  • To sustain stable quality by applying SPC control.
  • SPC control is fully supported by the general rule called "Western Electric Rules" ,which consists of  8 rules that are divided by measurement topic.

 

 
  • SPC control charts can be drawn up automatically by our QIS. Whenever a problem arises, it automatically tells us what is occurring outside of the rules. By utilizing this system, we can take action and carry out countermeasures for out-of-spec issues speedily and provide real time quality control. When something goes wrong in the manufacturing process the operators can use the OCAP process to identify and take corrective action in a timely manner.

 

3. D-Web 2000

 
D-Web is our new system which can disclose out-going data and QA process data to customers via an online browser.
  • NHK customers are assigned an ID and password
  • Data cannot be accessed without an ID and password (secure server and site)
  • QA data can be reviewed online by the customer
  • Updated data can be viewed online by accessing the NHK database directly
  • In addition to inspection data, transition charts and histograms can be viewed
  • The system was implemented in Sept. 2003
  • The following charts are available;
    Inspection data, X-bar charts, X-bar charts w/o R, X-median charts,
    X-R charts, Multivariable histograms, Histograms by lot, Histograms by samples,
    SPC charts