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Quality

Quality Assurance Plan

     In order to produce good quality products, meet the customers’ requirement, we have a set of strict quality assurance plan. And our quality management system has got the certificate of ISO9001:2008 standard.

 

     All products must be manufactured strictly according to the corresponding production process. Each production process must be supervised by the supervisor. Both the performer and the supervisor must sign and confirm that the relevant elements are fully implemented.

 

Roll process flow:

SAND PREPARATION → MOULDING →  MOULD DRYING → MOULD ASSEMBLING → MELTING → CASTING → COLDING → CLEANING → HEATTREATMENT → ROUGH MACHINING → INSPECTION → FINISHING MACHINING → PACKING


1. A series testing will be run in the entire production processing.

A. Ladle final analysis:

The test result will be shown on the Test Certificate and the test record will be kept in file.





B. Hardness test:

The hardness test will be conducted three times, one after rough machining, one after heat treatment and one after finishing machining.

On the barrel, three X lines and one Y line will be chosen by random, and the test will be done on 3-7 points on each line. And the same will be done on the neck.

The test result will be shown on the Test Certificate and the test record will be kept in file.

C.   Stress test:

The stress test will be conducted after rough machining.

The test will be done on 3 points each at both ends of barrel and the middle of the barrel by random. Test record will be kept in file.

D.   Ultrasonic test:

The ultrasonic test will be conducted after rough machining.

The test will be done on the whole surface of barrel.

The test result will be shown on the Test Certificate and the test record will be kept in file.

E. Metallographic test:

The metallographic test will be conducted after rough machining.

The test will be done on the surface of barrel and the neck.

The test result will be shown on the Test Certificate and the test record will be kept in file.

F. Tension Test:

The tension test will be conducted after heat treatment.

The test will be done on a specimen of size 10x140mm from the barrel.

The test result will be shown on the Test Certificate and the test record will be kept in file.


G. Dimension and overall surface test:

The dimension test will be conducted after finishing machining. The test will be done according to the drawing. And at the same time, the overall surface will be checked also.

The test result will be shown on the Test Certificate and the test record will be kept in file.


 2. After shipment, we will provide the test certificate for each roll to the customer.