Posted by DR. EVIL on February 15, 2019 at 05:20:57 from (174.197.1.49):
In Reply to: Re: Chinese parts posted by Eldon (WA) on February 14, 2019 at 21:04:46:
Eldon - You better put your tin foil cap on if you listen to CNN or MSNBC news. Last company I worked for, a product manager saw an on-line advertisement for one of our most popular products from a source he never heard of. So He bought six pieces. Cheap shoddy imitation of our complex part right down to our corporate logo molded into the main body, but very poorly done. Our in-house design life to failure is 30 years of use. Typically several thousand hours of constant use to test. The Chinese knock-off failed after 4 or 5 hours, and was marginal in operation the whole time. It was obvious it was a China knock- off. We actually had a plant in China making product from parts we sent them, might have been an inside job but the sales of the knock-off stopped.
Been my experience China has good machining and process capability, most US process companies have plants already in China, but where China fails miserably is their wrought metal producing capability. Say you want a Class 30 gray iron machined and painted casting. Part will be dimensionally accurate, but iron will not be to spec, be weak or brittle, lots of slag inclusions but paint will be perfect, but probably covers up loads of burned in sand. The Chinese workers sweep trash up off the floor and toss it into the melting furnace. I've seen 1/4" diameter brass rod split in two length wise because of slag inclusions running the length of the extruded rod. Seen 1 inch thick steel plate split into 1/4" and 3/4" thick sections for slag or oxide veins running thru the plates. Cause is poor house-keeping, poor process control, result is early failure of parts or assemblies, sometimes catastrophic failures.
So, yes, China can make "good" parts, but chooses to ship the US junk most times. They have their own domestic materials with wide open ranges on chemistry, and typically three times as wide of dimensional tolerances. You won't hear these things on FOX news, but POTUS is correct, China needs to clean up their act. What China has done to the US metals industries with their junk steel, iron, brass, even plastics is terrible. I'M glad to see US based steel companies getting back on their feet.
SON works for a large multi-national corporation, couple years ago they switched from US made nylon tie- straps, wire ties, chicken bands, to China made similar parts, but the new parts were weak, brittle, and the tapered end had too much molding flash to start in the eyelet. What the company wasn't seeing was instead of SON grabbing four per machine he'd grab a handful, would use 6 to 10 to get 4 good ones on the machine. Most companies would describe that as a huge cost savings, saving maybe a penny per part and because usage increased so much savings was way higher than predicted, but ignor the fact they needed an average of 8 pcs to meet the demand of 4 per machine, so cost almost twice as much.
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