scholarly journals FEM Analysis of Temperature Distribution of Flat Mold by Direct Resistance Heating Method

2018 ◽  
Vol 67 (3) ◽  
pp. 367-374
Author(s):  
Kazuto TANAKA ◽  
Jun NAKATSUKA ◽  
Tsutao KATAYAMA ◽  
Hideyuki KUWAHARA
Keyword(s):  
Temperature Distribution ◽  
Fem Analysis ◽  
Resistance Heating ◽  
Heating Method

Design of an induction heating coil coupled with magnetic flux concentrators for barrel heating of an injection molding machine

2014 ◽  
Vol 229 (3) ◽  
pp. 518-527 ◽  
Author(s):  
Huy-Tien Bui ◽  
Sheng-Jye Hwang
Keyword(s):  
Temperature Distribution ◽  
Injection Molding ◽  
Magnetic Flux ◽  
Heating Rate ◽  
Induction Heating ◽  
Heating Time ◽  
Resistance Heating ◽  
Molding Machine ◽  
Heating Method ◽  
Heating Coil

In an injection molding machine, the conventional barrel heating system which uses resistance heating method (RH) has some drawbacks such as low heating rate, long heating time, and energy loss. With induction heating (IH) technique, the barrel can better handle almost all of these disadvantages. However, non-uniform temperature distribution on inside surface of a barrel is the main drawback of induction heaters. A working coil coupled with magnetic flux concentrators via adjustment of magnetic flux concentrator spacing to achieve uniformity of magnetic flux and temperature distribution on the inside surface of a barrel was proposed and experimented. Results showed that, when barrel was heated by induction heating method with the proposed induction heating coil, heating time to reach a specific temperature could be reduced, and heating rate increased compared to resistance heating method. With 8 mm pitch of magnetic flux concentrators on a coil, the temperature distribution was the most uniform.

Embedded resistive heating in composite scarf repairs

2016 ◽  
Vol 51 (18) ◽  
pp. 2575-2583 ◽  
Author(s):  
Mahdi Ashrafi ◽  
Brandon P Smith ◽  
Santosh Devasia ◽  
Mark E Tuttle
Keyword(s):  
Temperature Distribution ◽  
Outer Surface ◽  
Thermal Gradient ◽  
Thermal Damage ◽  
Electrical Current ◽  
Tensile Tests ◽  
Resistance Heating ◽  
Uniform Temperature ◽  
Uniform Temperature Distribution ◽  
Bond Strengths

Composite scarf repairs were cured using heat generated by passing an electrical current through a woven graphite-epoxy prepreg embedded in the bondline. Resistance heating using the embedded prepreg resulted in a more uniform temperature distribution in the bondline while preventing any potential thermal damage to the surface of the scarf repairs. In contrast, conventional surface heating methods such as heat blankets or heat lamps lead to large through thickness thermal gradient that causes non-uniform temperature in the bondline and overheating the outer surface adjacent to the heater. Composite scarf repair specimens were created using the proposed embedded heating approach and through the use of a heat blanket for circular and rectangular scarf configurations. Tensile tests were performed for rectangular scarf specimens, and it was shown that the bond strengths of all specimens were found to be comparable. The proposed embedded curing technique results in bond strengths that equal or exceed those achieved with external heating and avoids overheating the surface of the scarf repairs.

Application of Electric Resistance Heating Method on Titanium Hot Forming at Industrial Scale

2016 ◽  
Vol 41 (11) ◽  
pp. 4441-4448 ◽  
Author(s):  
Fahrettin Ozturk ◽  
Remzi Ecmel Ece ◽  
Naki Polat ◽  
Arif Koksal ◽  
Zafer Evis ◽  
...  
Keyword(s):  
Hot Forming ◽  
Industrial Scale ◽  
Resistance Heating ◽  
Electric Resistance ◽  
Heating Method ◽  
Electric Resistance Heating

Local Prevention of Hardening for Punching of Hot-Stamped Parts

2015 ◽  
Vol 639 ◽  
pp. 205-212 ◽  
Author(s):  
Kenichiro Mori ◽  
Tomoyoshi Maeno ◽  
Takuya Suganami
Keyword(s):  
Temperature Distribution ◽  
Laser Cutting ◽  
Heating Temperature ◽  
Resistance Heating ◽  
Hardness Distribution ◽  
Delayed Fracture ◽  
Austenitic Transformation ◽  
Sheared Edge ◽  
Heat Transfers

Punching portions of the sheet are sandwiched between the ceramic billets during rapid resistance heating to prevent hardening of these portions. When the heating temperature is locally lower than that of the austenitic transformation, i.e. below 800 oC, this portion is not hardened without occurrence of martensitic transformation, and thus cold punching of hot-stamped parts becomes easy. The ceramic billets are made of alumina and the heat transfers to the billets. The temperature distribution just after resistance heating, the hardness distribution of the hot-stamped sheet, the cold punching load, the quality of the punched hole, etc. were measured. Hardening of punching portions was successfully prevented by sandwiching between the ceramic billets. The cold punching load for the local prevention of hardening was half of that without local prevention and the delayed fracture was also prevented, whereas the drop in hardness around the sheared edge became larger than that for laser cutting.

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