Comprehensive Temperature study for Large CNC machining center
Hi all!

I have been tasked with completing a comprehensive temperature study on a latge 5 axis CNC. I was wondering if anyone has done something like this, and if so, if there are any suggestions or things to avoid. We want our study to be wireless, preferably bluetooth, and and to take readings before, during, and after machining. We want to make informed decisions on part/fixture movement based on temperature change. Please, if anyone has any resources or papers i can reference to set up my study, it would be greatly appreciated!

Thanks

Patrick
4 Replies
Mohammad,

This study is to determine if temperature fluctuations are affecting our quality. We have an oversized machining center in a temperature controlled room. However, I believe the temperature changes in the machining chamber are resulting in thermal expansion, causing difficulty during inspection. I would like to perform a temperature mapping of the machine, and constantly monitor the changes in temperature. I am just looking to see if anyone has done something similar and could give me some advice or tips. We are currently leaning toward a Thinaer system that uses thermocouples and get that data back using Bluetooth.
Hello Patrick
I have question
Does your study covers the exposure to extreme temperature  in the work environment and it is influenced by the season or a worker are exposed to heat on a year round basis
Thanks
Mohammad
I have completed similar studies.  I recommend you follow the methodology of ISO 230-3 "Test Code for Machine Tools - Determination of Thermal Effects" (See also ASME B5:54).  The Spindle Error Analyzer (capacitance probes) equipment from Lion Precision ( Non-Contact Displacement Sensors | Lion Precision) was the most useful. IBS Precision's Rotary Analyzer may also work well.  IBS Precision Engineering (ibspe.com).  

Renishaw's bluetooth ball bar would work for before and after machining, but the machine may cool during your setup time.  If you have a good touch probe, you can do limited studies by probing artifacts while alternating tool changes and running the spindle.  However, thermal effects may greatly impact the tool change repeatability. 

A good plan quantifying the required accuracy will significantly aid you in measurement equipment selection.

Other tips:
  • Get a good baseline with the machine idle given various room temperature effects (consider daily/seasonal sunshine in windows as well).
  • Watch your tool change accuracy.
  • Gather all the various spindle speed vs time maps that your products require.  Some effects are noticeable in seconds, while others take hours.
  • It can take a long time for a machine to cool down, so be careful with successive tests.  You may be comparing apples to oranges if the thermal state of the machine is not similar at the start of each test.
Regards,
Jim Redekopp

 
David Sulli
20 Posts
I would recommend speaking with Jason Stanley with Raven Technology.
https://raven.ai/ 


sent from my Galaxy Note 9

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