TQD007
Mechanical
- May 20, 2016
- 2
Hi,
I am trying to bring this part in-house to save money, improve the quality and appearance of this part. This is a "door latch-spring" application that latches two vertically bi-parting dumbwaiter elevator doors. The "v-notch" latches onto a 3/4" round stock to secure the two halves of the vertically bi-parting elevator doors. The design goes back at least 6 decades, maybe more. The latch-spring is made from T301 3/4-hard stainless that has a dimension of 0.052" thick X 0.390" wide X approximately 7.0" long in the formed condition.
Material: T301 3/4-hard Stainless.
1. I looked up and noticed that several vendors have the T301 3/4-hard Stainless in 0.044" and 0.050" sheet and strip forms.
2. I want to see if I can arrange the part in the flat, and laser cut it by nesting and "kiss-cutting" from say a standard 48"X96" sheet. I would arrange the parts so that a tiny "bridge" is left at each end, and is connected to a 1"-2" wide carrier strip. Then I would either shear this 1"-2" wide carrier strip on a shear, or manually cut the bridges off with a small cut-off abrasive wheel.
My questions are:
1. Will the heat from the laser have any ill effect on the part? From the light brass-color heat dis-coloration, I have assumed that the part was formed and later tempered? Am I correct to assume that the the vendor used 301 3/4-hard S/S and then tempered the part after forming? If so, what is the temper specs that I need to give to a heat treating company?
2. I did a search and only Earle M. Jorgensen offered 301 3/4-hard stainless steel at 0.050" thickness in 48"X96" sheet. However, they only offer the material in 1/4-hard and 1/2-hard condition.
3. Since tempering will increase the tensile and yield strength, can I use 1/2-hard condition 301 S/S and bring it to 3/4-hard tensile and yield strength after tempering it?
4. The hole is 0.157". What kind of tool steel and coating should I use to get the best life from my punches? This is assuming I would punch the part or add the holes after forming to hold edge-to-hole tolerance since I have not build a blanking tool or forming tool yet. Actually, I need help here also.
5. The reason I want to use a laser to cut the part is because I don't want to damage my shears when shearing this part.
6. Quantity is approximately 150 parts per year unfortunately.
Any help is greatly appreciated!
Sincerely,
Trung Do
I am trying to bring this part in-house to save money, improve the quality and appearance of this part. This is a "door latch-spring" application that latches two vertically bi-parting dumbwaiter elevator doors. The "v-notch" latches onto a 3/4" round stock to secure the two halves of the vertically bi-parting elevator doors. The design goes back at least 6 decades, maybe more. The latch-spring is made from T301 3/4-hard stainless that has a dimension of 0.052" thick X 0.390" wide X approximately 7.0" long in the formed condition.
Material: T301 3/4-hard Stainless.
1. I looked up and noticed that several vendors have the T301 3/4-hard Stainless in 0.044" and 0.050" sheet and strip forms.
2. I want to see if I can arrange the part in the flat, and laser cut it by nesting and "kiss-cutting" from say a standard 48"X96" sheet. I would arrange the parts so that a tiny "bridge" is left at each end, and is connected to a 1"-2" wide carrier strip. Then I would either shear this 1"-2" wide carrier strip on a shear, or manually cut the bridges off with a small cut-off abrasive wheel.
My questions are:
1. Will the heat from the laser have any ill effect on the part? From the light brass-color heat dis-coloration, I have assumed that the part was formed and later tempered? Am I correct to assume that the the vendor used 301 3/4-hard S/S and then tempered the part after forming? If so, what is the temper specs that I need to give to a heat treating company?
2. I did a search and only Earle M. Jorgensen offered 301 3/4-hard stainless steel at 0.050" thickness in 48"X96" sheet. However, they only offer the material in 1/4-hard and 1/2-hard condition.
3. Since tempering will increase the tensile and yield strength, can I use 1/2-hard condition 301 S/S and bring it to 3/4-hard tensile and yield strength after tempering it?
4. The hole is 0.157". What kind of tool steel and coating should I use to get the best life from my punches? This is assuming I would punch the part or add the holes after forming to hold edge-to-hole tolerance since I have not build a blanking tool or forming tool yet. Actually, I need help here also.
5. The reason I want to use a laser to cut the part is because I don't want to damage my shears when shearing this part.
6. Quantity is approximately 150 parts per year unfortunately.
Any help is greatly appreciated!
Sincerely,
Trung Do
