Guangdong Hongtai Technology Holdings Co.

China

Guangdong Hongtai Technology Holdings Co.

China

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Wan L.,Huazhong University of Science and Technology | Liu H.,Guangdong Hongtai Technology Holdings Co. | Wu S.,Huazhong University of Science and Technology | Wu Z.,Guangdong Hongtai Technology Holdings Co. | And 3 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2012

To meet the requirements of own-brand car named "Trumpche" belonging to Guangzhou Automobile Group (GAC), high vacuum die-casting technology for the rear sub-frame of car chassis was developed including mechanical properties of the alloy, processing design and optimization, design and manufacturing of the mould, quality control of die castings. The results show that good sealing effect can be improved by adopting high vacuum die casting die with heat resistant sealing structure. Die temperature controlling precision was improved by thermocouple positioned in multi-location of the die and on-time adjustment of cooling water flow rate. Through optimizing processing parameters, some defects, such as crack, cold shut, shrinkage porosity (hole), can be eliminated. The car chassis with tensile strength over 240 MPa, yield strength over 145 MPa and elongation greater than 6% can be achieved, meeting the use requirements.


Wan L.,Huazhong University of Science and Technology | Wan L.,Guangdong Hongtai Technology Holdings Co. | Yang J.,Huazhong University of Science and Technology | Liu H.,Huazhong University of Science and Technology | And 3 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2012

Aiming at die casting thick-walled ADC automobile clutch gear, P-Cu modification on hypereutectic Al-Si alloy suitable for die casting was conducted. Die casting scheme for clutch gear was designed and simulated, meanwhile, vacuum die casting and local pressurization technology were developed. The results show that with 0.1% P addition, ADC14 exhibits good modification effects with 6 h modification time, where primary Si phase in the alloy reaches 20~40 μm with uniform distribution, and the depth of Si particle depletion zone on surface of the castings is in the range of 0.18~0.20 mm. At given injecting parameters, the mechanical vacuum valve is superior to zig-zag valve in vacuum effects, and the rejected rate with gas hole is decreased by 10%. Shrinkage porosity (hole) at thick-wall of the gear can be effectively eliminated by optimized local pressurization, the quality of the gear is improved, and qualification rate of mass-production is more than 95%.


Ma G.,Guangzhou Die and Mould Manufacturing Co. | Wan L.,Guangdong Hongtai Technology Holdings Co. | Wan L.,Huazhong University of Science and Technology | Liang Z.,Guangzhou Die and Mould Manufacturing Co. | And 5 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2012

The development of lightweight and die casting technology for car body/chassis suspension key parts is one of the foremost research fields recently. To meet the requirements of own-brand car named "Trumpchi" belonging to Guangzhou Automobile Group (GAC), die casting design for the rear subframe of the car chassis was performed. The results showed that the gating system and overflow/venting design based on Flow-3D simulation are reasonable, whose filling process is smooth. Good sealing effect can be improved by sealing design at parting surface, ejected pin, and shot pin. where vacuum degree can be reached up to 91kPa within 1s. Temperature-control precision can be improved effectively by adopting several thermocouples positioned temperature measuring in the die and individual adjustment of cooling water flow rate according to the mold temperature. Mass-volumetric production was made by the mold now.


Lin H.,Huazhong University of Science and Technology | Wan L.,Huazhong University of Science and Technology | Liu H.-Y.,Guangdong Hongtai Technology Holdings Co. | Zhang Y.-C.,Guangdong Hongtai Technology Holdings Co. | And 4 more authors.
Zhuzao/Foundry | Year: 2011

Based on innovative high vacuum control system, effects of shot parameters including vacuum level, venting time, shot velocity and switch position of fast velocity on casting quality and mechanical properties were investigated for the high vacuum die-cast car chassis part in this paper. The results show that optimal process parameters are as follows: the vacuumed startup and stop position are 110 mm and 700 mm respectively, and the vacuum level of cavity is up to 91 kPa; meanwhile the slow and fast velocity of the injection punch are 0.19 and 5.8 m/s, and switch position of fast velocity is 240 mm. The round car chassis part can be achieved under above parameters, whose tensile strength is 281.56 MPa, yield strength 155.44 MPa and elongation up to 7.34%. The chassis part was successfully employed in a domestic own-brand car.


Wan L.,Huazhong University of Science and Technology | Lin H.,Huazhong University of Science and Technology | Liu H.,Guangdong Hongtai Technology Holdings Co. | Chen G.,Guangdong Hongtai Technology Holdings Co. | And 4 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2011

We have developed key techniques including vacuum valve and its control equipment for high vacuum die casting. The running principle of the vacuum valve is that exhausting channel is closed by a level arm driven by liquid pressure in the valve. Vacuum control apparatus uses PLC and touch screen technology to make sure reliable working state of valve. The vacuum die casting technology has been used for producing car chassis part, transmission box and 3G housing, and desirable effects are achieved.


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Guangdong Hongtai Technology; Holdings Co. | Date: 2013-01-22

Elevators; moving staircases; moving pavements; embossing machines; processing plastic moulds; foundry machines; molds; cold chamber die casting machines; starters for motors and engines.

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