The study of direct heating billet within the forging dies using resistance method

Cheng, Fang; Cheng, Yu

doi:10.1179/1432891714z.000000000589

Cited by 2 publications

(3 citation statements)

References 7 publications

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“…Figure 1 shows a schematic diagram of the hot forming apparatus used for H3S directly heated within the die using the resistance method invented by the authors. 12 The prototype system containing a resistance heating apparatus was set up for heating blank to the working temperature during the forging operation, and an electric source provided a voltage of 12 V. The working temperature was controlled using a proportional–integral–derivative (PID) feedback (TempScan 1100), and the temperature distribution of the blank was measured using a thermocouple system and an infrared thermograph. All K-type thermocouples were welded directly onto the blank to ensure a short response time.…”

Section: Methodsmentioning

confidence: 99%

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Hole-flange forming of high-strength steel sheet using one-step hot stamping-forging method

Cheng

2016

Proceedings of the Institution of Mechanical Engineers, Part B:

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A process of one-step hot stamping-forging for increasing the tensile strength of the hole-flanging of the high-strength steel sheets with flange thickening was developed. In this proposed method, the high-strength steel sheet is directly formed within the designed die, which is simultaneously accompanied with a resistance heating, a hole punching, and the flanging and forging processes. The electrode material is SKD61. This material is not only used as the forming of the high-strength steel sheet but also directly served as the heating of the high-strength steel sheet within the die. The experimental results indicated that the high-strength steel sheet could be heated to 850 °C in 30 s by the SKD61 die. It demonstrates the successful completion of heating, hole punching, flanging and forging in a one-step process. Furthermore, it is found that the tensile strength of M18 tapped hole with forged part is increased by about 7.4% than that without forged part, and the breaking toughness is increased by about 33%.

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Section: Methodsmentioning

confidence: 99%

“…This phenomenon can substantially affect forming ability. 10,11 Cheng and colleagues 12,13 have developed a system that can achieve the direct resistance heating and forming of a billet using SKD61 die in one-step hot forging process.…”

Section: Introductionmentioning

confidence: 99%

Hole-flange forming of high-strength steel sheet using one-step hot stamping-forging method

Cheng

2016

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…The forming method is called one-step forging process as shown in Fig. 3(a) [18]. The developed one-step-gradual forging process is experimentally found to be able to build a successful bolt-head shape as shown in Fig.…”

Section: Introductionmentioning

confidence: 97%

A Study of One-Step-Gradual Forging Process with the Progressive Heating Method

Cheng

2015

Materials and Manufacturing Processes

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A resistance heating method and a one-step-gradual forging process were used to study a billet within a die. The billet was directly heated accompanied with a progressive heating manner. The pressing speed of the upper die is kept at the same course with the billet heating speed, thus integrating the forming procedure by simply controlling one speed in effect. Experimentally, it is found that based on this innovative forming method, the experimental results indicated that the billet can be heated to 1000 C from top to bottom within approximately 5 s. This leads to a further modification of the material flow for a 12-point bolt-head, which in the end results in an improvement of the forming ability. Most importantly, the forming load of gradually forging can cause a 25% deduction compared with the one performed by one-step forging. Numerically, the commercial finite element method package of DEFORM was used to simulate the novel one-step-gradual forging process. The simulated material flow phenomena were thoroughly studied in subsequence. The results between FEM simulations and experiments showed good agreements.

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The study of direct heating billet within the forging dies using resistance method

Cited by 2 publications

References 7 publications

Hole-flange forming of high-strength steel sheet using one-step hot stamping-forging method

Hole-flange forming of high-strength steel sheet using one-step hot stamping-forging method

A Study of One-Step-Gradual Forging Process with the Progressive Heating Method

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