Quality control is Dinnovation's life, in order to achieve the technical requirements of metal spun products. We build our inspection standard and management ways to control the accuracy and appearance, the basic inspection tool and pass only rules are applied in the production.

All the inspection tools, welding fixture and samples be preserved and recorded in Dinnovation's quality control room.

● The temperature ：The cold pressing will increase the temperature of the roller and mold in the production, the dimension of roller and mold will increase and the gap between roller and mold reduce, the gap effects spin forming accuracy.

In order to control the temperature, hydroforming oil is usually used to cool. Another way is to use the industrial fan blow the mold and make it cool quickly. If the temperature is stable, the accuracy is same as you original debugging.

● Spinning roller：The abrasion of spinning roller is obvious in stainless steel spinning, then the spun parts will have scratchs. So we need to polishing the spinning roller if we use it for a long time.

● Spinning roller ：If the surface of spin roller is scratched, the exterior appearance of spun products is scratched. We check the appearance of spinning roller to control the exterior surface every 4 hours.

● Spinning mold ：Mold surface effects the interior appearance of spun products. 

● Lubrication oil : It reduce the friction between spinning roller and work piece.

We usually measure the diameter ,height ,thickness according to customer's drawing.

● Callipers : +-0.015mm  

● Height gauge : +-0.01mm

● Ultrasonic thickness tester : +-0.05mm

● Weight : +-5g

We use pass only rules to control the diameter and height tolerance.

● Diameter tolerance : 0.2mm

● Height tolerance : 0.5mm

● Thickness tolerance : 0.1mm

We use CNC milling to make a curve pass only inspection tool to measure the shape and curve.

● Curve accuracy : +-0.2mm

Military part and aircraft part measurement.

● Accuracy : +-0.01mm

We design and make a special inspection tool to check the relative position accuracy. 

● Inspection tool accuracy  : +-0.1mm

● Air pressure testing : In order to check the the product without leakage after welding, we use air pressure to test every bowl in the water tank, if there is bubble under the water, we will mark the position and welding it again.

● X-ray test : In order to keep the tensile strength of welding, we should test the welding by take a photo of X-ray, to make sure whether there is air hole and slag inclusion.

● Appearance : one quality controller is responsible for appearance inspection, includes polishing and brused effect, powder coating and oxidation effect inspection.

● Accuracy : one quality controller is responsible for the accuracy of diameter, height, thickness and curve.