The development direction of automotive mold

At present, China's automobile mold manufacturing enterprises have formed a considerable number and scale, but they are mostly in the low-end repetitive construction, and even there is a situation in which the medium and low-end molds have excess capacity. For the high-end development of automobiles, the high-end mold manufacturing required is far from meeting the requirements. The development, design and manufacturing capabilities of high-end molds are far from fully meeting the needs of China's auto industry. High-end molds still need a large amount of imports. How to develop automotive molds? Recently, Xu Zhonghe, director of the technology department of Qizhong Numerical Control Equipment Co., Ltd. mentioned the five directions of automobile mold development to the metal processing online reporter:

(1) Focus on the development of computer technology The focus of mold manufacturing technology development is to highlight the application of computers, and more and more people are moving from the production site to the computer. Solid design plus CNC programming replaces manual real-world production and machine operation. The fine die face design and fine CNC programming greatly reduce the clamping repair, and the high precision machining eliminates the grinding and repairing of the die.

(2) Integrated processing There are three kinds of CNC machining lines on the machine shop: the first is the processing line composed of several CNC machine tools with interchangeable bed; the second is the unattended flexibility with the three-dimensional warehouse. The processing machine group, which was the product of the early 1990s; the third type is the roughing and finishing integrated, high-speed, high-precision, five-axis machining center that has been put into use in recent years.

(3) The refined manufacturing of the mold is an inevitable trend. The so-called refined manufacturing of the mold, in terms of the development process and manufacturing results of the mold, specifically represents the rationalization of the stamping process and the design of the mold structure, the high precision of the mold processing, and the mold product. High reliability and rigor of technical management.

(4) Digital mold technology has become the mainstream direction Digital automotive mold technology mainly includes the following aspects: 1 Design for manufacturability (DFM), which considers and analyzes manufacturability during design to ensure the success of the process. 2 The auxiliary technology of mold surface design develops intelligent profile design technology. 3CAE assists in the analysis and simulation of the stamping process, predicting and resolving possible defects and forming problems. 4 Replace the traditional two-dimensional design with a three-dimensional mold structure design. 5 mold manufacturing process using CAPP, CAM and CAT technology. 6 Under the guidance of digital technology, solve the problems that arise during the trial mold process and in the stamping production.

(5) Rapid development of mold processing automation It is not uncommon to have an automatic tool changer (ATC), an automatic processing photoelectric control system, and an on-line measurement system for workpieces in advanced automotive mold companies. CNC machining has evolved from simple profile processing to full-scale machining of profile and structural surfaces. From medium to low speed machining to high speed machining, machining automation technology has developed rapidly.

Low Voltage Switchgear or LV Switchgear
Generally Electrical Switchgear rated upto 1KV is termed as low voltage switchgear. The term LV Switchgear includes low voltage circuit breakers, switches, off load electrical isolators, HRC fuses, earth leakage circuit breaker, miniature circuit breakers (MCB) and molded case circuit breakers (MCCB) etc i.e. all the accessories required to protect the LV system.
The most common use of LV switchgear is in LV distribution board. This system has the following parts
Incomer
The incomer feeds incoming electrical power to the incomer bus. The switchgear used in the incomer should have a main switching device.
 The switchgear devices attached with incomer should be capable of withstanding abnormal current for a short specific duration in order to allow downstream devices to operate. But it should be cable of interrupting maximum value of the fault current generated in the system. It must have interlocking arrangement with downstream devices. Generally air circuit breakers are preferably used as interrupting device. Low voltage air circuit breaker is preferable for this purpose because of the following features 1.Simplicity
2.Efficient performance
3.High normal current rating up to 600 A
4.High fault withstanding capacity upto 63 kA
Although air circuit breakers have long tripping time, big size, high cost but still they are most suitable for low voltage switchgear for the above mentioned features. 
Sub - Incomer
Next downstream part of the LV Distribution board is sub - incomer. These sub - incomers draw power from main incomer bus and feed this power to feeder bus. The devices installed as parts of a sub - incomer should have the following features 1.Ability to achieve economy without sacrificing protection and safety
2.Need for relatively less number of inter - locking since it cover limited are of network.


ACBs (Air Circuit Breakers) and switch fuse units are generally used as sub - incomers along with molted case circuit breakers (MCCB). 

Feeders
Different feeders are connected to the feeder bus to feeds different loads like, motor loads, lighting loads, industrial machinery loads, air conditioner loads, transformer cooling system loads etc. All feeders are primarily protected by switch fuse unit and in addition to that, depending upon the types of load connected to the feeders, the different switchgear devices are chosen for different feeders. Let's discuss in details •Motor Feeder
•Motor feeder should be protected against over load, short circuit, over current up to locked rotor condition and single phasing.
•Industrial Machinery Load Feeder
•Feeder connected industrial machinery load like oven, electroplating bath etc are commonly protected by MCCBl and switch fuse disconnector units
•Lighting Load Feeder
•This is protected similar to industrial machinery load but additional earth leakage current protection is provided in this case to reduce any damage to life and property that could be caused by harmful leakages of current and fire.
In LV switchgear system, electrical appliances are protected against short circuit and over load conditions by electrical fuses or electrical circuit breaker. However, the human operator is not adequately protected against the faults occurs inside the appliances. The problem can be overcome by using earth leakage circuit breaker. This operates on low leakage current. The earth leakage circuit breaker can detect leakage current as low as 100 mA and is capable of disconnecting the appliance in less than 100 msec. 

LV Switchgear

LV Switchgear,Low Voltage Switchgear,Metal LV Switchgear

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