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Induction heating question
I have a small run of parts that have a #3 Morse taper on one end. At
the small end of the taper is a straight diameter that's .700 diameter by .600 long. The material is 17-4 PH stainless. I want to harden the small end only. To do this it must be heated to 900 degrees F and held there for a while. I was wondering if a 2000 watt induction heater would be up to the task. I know there are many variables but there must be a minimum amount of power needed. Anybody know? Thanks, Eric |
Induction heating question
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Induction heating question
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... I have a small run of parts that have a #3 Morse taper on one end. At the small end of the taper is a straight diameter that's .700 diameter by .600 long. The material is 17-4 PH stainless. I want to harden the small end only. To do this it must be heated to 900 degrees F and held there for a while. I was wondering if a 2000 watt induction heater would be up to the task. I know there are many variables but there must be a minimum amount of power needed. Anybody know? Thanks, Eric Do you have an infrared thermometer that reads that high? You could heat the end of a reject or test piece with acetylene until the red glow is visible in dim light and measure the temperature profile down the taper. https://www.amazon.com/Perfect-Prime...gh+temperature -jsw |
Induction heating question
On Wednesday, September 19, 2018 at 7:39:21 PM UTC-4, wrote:
I have a small run of parts that have a #3 Morse taper on one end. At the small end of the taper is a straight diameter that's .700 diameter by .600 long. The material is 17-4 PH stainless. I want to harden the small end only. To do this it must be heated to 900 degrees F and held there for a while. I was wondering if a 2000 watt induction heater would be up to the task. I know there are many variables but there must be a minimum amount of power needed. Anybody know? Thanks, Eric The big problem that I see is avoiding hardening the rest of the part. I would suggest you think about why you do not want the entire part hardened and try to think about how you could live with the entire piece being hard. As I remember to harden 17-4 ph you heat to 900 F and hold it at that temp for an hour. Dan |
Induction heating question
On Wed, 19 Sep 2018 22:35:28 -0400, Neon John wrote:
On Wed, 19 Sep 2018 16:40:30 -0700, wrote: I have a small run of parts that have a #3 Morse taper on one end. At the small end of the taper is a straight diameter that's .700 diameter by .600 long. The material is 17-4 PH stainless. I want to harden the small end only. To do this it must be heated to 900 degrees F and held there for a while. I was wondering if a 2000 watt induction heater would be up to the task. I know there are many variables but there must be a minimum amount of power needed. Anybody know? Yes I do. Until last July 1st when health problems forced my retirement, I owned Tellico Induction Company Inc. Or Tnduction. We manufactured a line of Royer-type induction heaters ranging from 1500 watts to 10kW. Our 2500 watt heater would have done the job just fine. I have a set of spreadsheets to compute stuff like this. Assuming you're starting at 70 deg and ignoring Stephan-Boltzman radiative losses and ignoring heat conducted away by the adjacent steel, it will take approximately 260 seconds to reach 900 deg F with a 2500 watt heater. So I'd guess about 300 seconds. Our 3500 watt unit would reduce the time to about 190 seconds. Normally at this point I'd go into the lab, prepare a test specimen duplicating your taper and actually time the heat rate. Unfortunately I've sold my lab and shop. My only question is that if you're going to hold the small end at 900 deg for a period of time, how are you going to keep the heat away from the heat affected zone? John DeArmond http://www.neon-john.com http://www.tnduction.com Tellico Plains, Occupied TN See website for email address Thanks for the info John. I'm not sure how I'll keep the heat from moving along the part and if I really care. I'm afraid that if the whole part is heat treated it may warp. If the very end just gets toughened a bit then I'll be happy. Eric |
Induction heating question
On Thu, 20 Sep 2018 05:39:39 -0700 (PDT), "
wrote: On Wednesday, September 19, 2018 at 7:39:21 PM UTC-4, wrote: I have a small run of parts that have a #3 Morse taper on one end. At the small end of the taper is a straight diameter that's .700 diameter by .600 long. The material is 17-4 PH stainless. I want to harden the small end only. To do this it must be heated to 900 degrees F and held there for a while. I was wondering if a 2000 watt induction heater would be up to the task. I know there are many variables but there must be a minimum amount of power needed. Anybody know? Thanks, Eric The big problem that I see is avoiding hardening the rest of the part. I would suggest you think about why you do not want the entire part hardened and try to think about how you could live with the entire piece being hard. As I remember to harden 17-4 ph you heat to 900 F and hold it at that temp for an hour. Dan Greetings Dan, You are correct about getting the full hardness. But I have done this before with a torch and the steel does get substantially nharder and tougher in just a rew minutes. The customer is not requiring the hardened end but it would make the part better. Sending the parts out for heat treatment may cause them to warp as they are long and the other end is pretty skinny. Eric |
Induction heating question
On Wed, 19 Sep 2018 16:40:30 -0700, wrote:
I have a small run of parts that have a #3 Morse taper on one end. At the small end of the taper is a straight diameter that's .700 diameter by .600 long. The material is 17-4 PH stainless. I want to harden the small end only. To do this it must be heated to 900 degrees F and held there for a while. I was wondering if a 2000 watt induction heater would be up to the task. I know there are many variables but there must be a minimum amount of power needed. Anybody know? Thanks, Eric Why not simply stick em into a broiler? __ "Poor widdle Wudy...mentally ill, lies constantly, doesnt know who he is, or even what gender "he" is. No more pathetic creature has ever walked the earth. But...he is locked into a mental hospital for the safety of the public. Which is a very good thing." Asun rauhassa, valmistaudun sotaan. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
Induction heating question
On Wednesday, September 19, 2018 at 4:39:21 PM UTC-7, wrote:
I have a small run of parts that have a #3 Morse taper on one end. At the small end of the taper is a straight diameter that's .700 diameter by .600 long. The material is 17-4 PH stainless. I want to harden the small end only. To do this it must be heated to 900 degrees F and held there for a while. I was wondering if a 2000 watt induction heater would be up to the task. I know there are many variables but there must be a minimum amount of power needed. Anybody know? Thanks, Eric I have done similar things with NiTi tubes. Clamp the need to be cold section into a coffee can and fill with water. Use a non contact IR thermometer to measure part temperature. Making a thermal couple work inside and induction heater magnetic field is an art. If you want to analyze the process I have done similar using 1-D finite difference formulations implemented in matlab script. One gets the time varying and steady state solution On Wednesday, September 19, 2018 at 4:39:21 PM UTC-7, wrote: I have a small run of parts that have a #3 Morse taper on one end. At the small end of the taper is a straight diameter that's .700 diameter by .600 long. The material is 17-4 PH stainless. I want to harden the small end only. To do this it must be heated to 900 degrees F and held there for a while. I was wondering if a 2000 watt induction heater would be up to the task. I know there are many variables but there must be a minimum amount of power needed. Anybody know? Thanks, Eric |
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