forged crankshaft used in air compressor
Material
Forged heat treatment steel EN 10083 DIN 42CrMo4 W 1.7225
Manufacturing process & ITP
| Item | Control process | Checking items | checking way | Inspection standard | documentation |
| 1 | forging | forged bar dimensions | callipers | per raw bar drawings |
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| 2 | chemical composition analysis | material spec listed in the drawings | once time/furnace | material spec in drawing | chemical composition analysis report |
| 3 | rough cutting | dimensions | self-checking & random checking | per process card dimensions |
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| 4 | altrasonic detection | forged bar inner defects | 100% checking | per customer tech requirements | altrasonic detection report |
| 5 | heat treatment | hardness | 100% checking | per drawing requirement | hardness report |
| 6 | Mechanical property | The tensile, yield, elongation, impact power, metallurgical low times | once time/furnace | per drawing requirement | Mechanical property report |
| 7 | semi-fine machining | dimensions | self-checking & random checking | per process card dimensions |
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| 8 | drilling & milling | dimensions | self-checking & random checking | per process card dimensions |
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| 9 | grinding | dimensions | self-checking & random checking | per process card dimensions |
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| 10 | magnetic detection | appearance defects | 100% checking | per customer tech requirements | magnetic detection report |
| 11 | final inspection | dimensions | 100% checking | per drawing requirement | final inspection report |
| 12 | cleaning & packaging | no damage with the packagings | visual inspection |
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Packaging
VCI papers & films used on inner packing as below for the reference.
As over 10 years of sub-supplier & OEM manufacturer, Shanghai Choikey Machinery Co. Ltd has 4 plants to provides professional products solution as below,
1. Crankshafts, plungers(used in Frac pumps, mud pumps, homogenizers, compressors & high pressure pumps)
2. Machined investment castings (for pumps, valves, trucks & construction machinery etc. )
3. Crushers & mining machinery parts (including OEM parts for Sandvik crushers)
4. Ice machines.
Shanghai Choikey and our factories are managed with ONE value---Focus on customer's success. As we believe our success only comes from our customer's success. With such value orientation, we promise:
* One key contact & speedy response. You'll have one key contact throughout the whole process so you always know who to speak to and won't be passed from pillar to post. Meanwhile you will enjoy a speedy response once you have any query or need supports from us.
* Uniform service. No matter the volume of your business, we will provide the uniform service in professional way. As we well know each client has been unique in approach and metrics for success, and we well understand the return on relationships.
* Optimum product solution. Your quality & delivery requirements are always respected, and further more you will receive the full benefits from our rich industrial experiences which may include alternative suggestions to your ideas. Based on that we will provide optimum product solution for the quality assurance & cost optimization.
With above, we always offer a personal service experience, profound technical knowledge, and a strong passion to deliver on our promises. We handle sales and customer service at the highest level to ensure full commitment to our clients. We are ready for you!
