Ministry of Industry and Information Technology: “Double G and Double Promotion” work has steadily advanced, and the proportion of 4G users has declined slightly

On March 19, the Ministry of Industry and Information Technology announced the economic operation of the communications industry from January to February 2020. The scale of 4G users (1.262 billion) accounted for 79.9% of the total number of mobile phone users, a decrease of 0.2 percentage points from the end of the previous year. Among them, the number of mobile phone users has entered a stable period, and the proportion of 4G users has declined slightly.

The scale of fixed broadband access users exceeded 450 million, and the scale of gigabit fixed broadband access users continued to expand. As of the end of February, the total number of fixed Internet broadband access users of the three basic telecommunications companies reached 452 million, a net increase of 2.83 million over the end of the previous year.Among them, there are 420 million optical fiber access (FTTH/O) users, accounting for 40% of the total fixed Internet broadband access users.

92.9%. Broadband users continued to migrate to high speeds. Fixed Internet broadband access users with an access rate of 100 Mbps and above reached 384 million, accounting for 85% of the total number of users.

The work of “Double G and Dual Delivery” has been steadily advanced, and the number of fixed Internet broadband access users with an access rate of more than 1000M has reached 1.97 million

. As of the end of February, the total number of mobile phone users of the three basic telecommunications companies reached 1.58 billion, which was basically the same as the same period last year. Among them, the scale of 4G users (1.262 billion) accounted for 79.9% of the total number of mobile phone users, a decrease of 0.2 percentage points from the end of the previous year.

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What is the melting point of silicone rubber?

silicone rubber is a highly active adsorbent material, is an amorphous substance, its chemical molecular formula is mSiO2-nH2O Because it is a hydrate, the temperature is too high will first lose crystalline water, the loss of crystalline water is not called silica, but called silica Therefore, silica only the highest use temperature, no melting point, silica: SiO2 is also known as silica. It is widely distributed in nature, such as quartz, quartz sand, etc. White or colorless, with high iron content is light yellow. Density 2.2 ~ 2.66. Melting point 1670 ℃ (scale quartz); 1710 ℃ (square quartz). Boiling point 2230 ℃, the relative dielectric constant is 3.9. 
The maximum temperature for regeneration of various industrial silica gel should not exceed the following limits.
Coarse pore silica gel shall not be higher than 600℃.
Fine pore silica gel shall not be higher than 200°C.
Blue gum indicator (or discolored silica gel) shall not be higher than 120℃.
Silicone aluminum rubber shall not be higher than 350 ℃.
After the regeneration of silica gel, its moisture is generally controlled at 2% or less can be put back into use

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    TSMC may use 5nm process to produce Core i3 chips for Intel

    Intel hopes that after outsourcing, it can focus more on breakthroughs in the manufacturing process.

    Market research company TrendForce indicated in a report released recently, the world’s largest chip foundry TSMC will use the 5nm process to produce Intel Core i3 chips.

    At present, Intel has outsourced its entry-level chip series to TSMC and will start production in the second half of this year.

    In Intel’s fourth-quarter earnings conference call, the incoming Intel CEO Pat Gelsinger (Pat Gelsinger) said that he believes that most of the company’s products will still be produced in-house in 2023, although it is “probable”. External foundries are used more than in the past.

    In addition, TrendForce said that TSMC expects to use the 3nm process to produce high-end chips for Intel in the second half of 2022.

    According to TrendForce, Intel has long outsourced the production of a large number of non-CPU chips to Taiwan semiconductor Manufacturing Co (TSMC) and United Microelectronics (UMC), accounting for approximately 15% to 20% of its output. Combined with Intel’s annual revenue of 70 billion U.S. dollars, this 15% to 20% outsourcing may be worth 10.5 billion to 14 billion U.S. dollars in 2020.

    Intel’s outsourcing of low-end processors this time allows it to maintain a competitive advantage, and it is responsible for the production of higher-profit chips internally.

    Compared with TSMC, Intel is still struggling with cutting-edge process technology for its 10nm and 7nm processes. Intel announced on its official website that the company’s board of directors has appointed Pat Kilsinger as the new CEO and mentioned in the announcement. Significant progress has been made in 7nm process technology, but due to the yield problem, Intel’s current technology node is still stuck at 10nm.

    In addition to the processor, Intel will abandon the plan of self-developed second-generation discrete graphics with a 7nm process, and instead seek TSMC for foundry, hoping to focus on achieving breakthroughs in the process, and then counter the rise of Nvidia.

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    37×86 CNC logging system

    With industrial control microcomputer as the core and high-speed display recording peripherals as the basic composition, the CLS3700 CNC measurement system is transformed into a 3X86 CNC measurement system. The system software is a CNC measurement software developed by BORLANDC++. The hardware composition of the 3X86 CNC measuring system and the main functions of the system software are introduced, the reasons that affect the real-time performance and speed of the measurement are analyzed, and the solutions are put forward.

    Numerical control surveying; real-time surveying; information processing; data processing CLS3700 logging system is a CNC equipment imported from ATLAS logging company of the United States in the mid-1980s in China. It has played an important role in my country’s petroleum exploration and development. From the overall performance point of view, the CLS3700 logging system is superior to all kinds of domestic CNC logging equipment, but its mainframe and some peripherals are already quite backward. Therefore, the CLS3700 logging system is transformed into 37 (86 CNC logging system). It seems necessary to expand or even upgrade its functions. From the transformation of the CLS3700 logging system in the Liaohe Oilfield in 1995 to the completion of the Daqing Oilfield transformation, the hardware and software are quite complete, and the logging effect has reached and partially exceeded the original logging system. Functionally, it has also been expanded 1 system hardware, modification, 1.1 hardware modification oscilloscope 82 (thermal modification CLS3700 numerical control logging system hardware idea: industrial control microcomputer system (586 mainframe keyboard floppy hard drive, CRT display, etc.) and thermal Plotting printer, replacing the 3782 computer box and general peripherals (hard disk drives, 2 tape drives, 2 CRT plotters, CRT monitors and teletypewriters) of the original CNC logging system, retaining the bus and dedicated peripherals; designing the bus The simulation card converts the microcomputer bus signal into the multi-channel bus signal that the original host and the peripherals correspond to the bus simulation card. From the perspective of the peripherals, the host of the original CNC logging system still exists. For the selection bus connected to the CLS3700 High-speed A/D channel, specially designed an interface card, directly inserted into the I/O slot of the 586 computer, 86 CNC logging system hardware structure diagram, in which the ISA/MUX bus converter is the bus simulation card. The CLS3700 CNC logging system software is relatively outdated and the operator feels deeply inconvenient, but it is a system software with high technical content and extensive coverage and complete functions. CLS3700 is transformed into a 3X86 numerical control logging system. Because the computer hosts of these two systems are completely different, the hardware environment has undergone great changes. Therefore, the system software of CLS3700 cannot run directly on the 3X86 system and needs to be redesigned. 3X 86 numerical control The logging system software adopts the design idea of ​​combining “simulation” and “redevelopment”. For some software dealing with 3752/3764 or downhole tools, as well as some software for special processing and data filtering, “simulation” is adopted; for the interface, Data eight-eight wiring control dual-meter., <1 floppy drive I high-speed data acquisition card bus 58 host CR display 3X86 numerical control logging system hardware structure keyboard as 2bMi196Ackd male UC1985 Master of a degree associate Hh present 1 computer application research and Teaching work: http://ww.cnki.net records, real-time acquisition and real-time control plotter drawing related software, then completely adopts “redevelopment” 3X86 numerical control logging system is divided into system diagnosis, instrument calibration, and conventional logging according to functions 8 functional softwares, variable density logging, dip logging, record playback, service table and map header, each functional software adopts a modular programming method. The call of 8 functional software is carried out by the main control program. This kind of program The advantages of the structure are: It can be independent, has little mutual influence, takes up precious memory resources, and is easy to expand. It can improve the reliability of the system and the logging speed. Each functional software is composed of two parts. The program and regulations for the realization of the function are specific The service table part of the operation. The program includes the common problems of various logging methods. The logging service table shows the characteristics of various logging tools, the types of the tools and the instrument string, and specifies the operation, control, recording and drawing curves of the logging program. , The area and scale of the drawing, and the filtering method of each curve, etc. 2 Real-time logging program Real-time logging program is included in conventional logging software, variable density logging software and dip logging software, and is used in the well site for on-site The logging operation program is the core of the entire 3X 86 logging system software. The main functions are: ①logging operation control; ②logging record, recording the logging data in digital form on the disk and plotting the log on the thermal printer; ③logging data, displaying on the CRT monitor in the form of a curve Above, as system monitoring; ④Acquire low-frequency analog logging data at a certain sampling rate; ⑤Data processing, such as filtering, depth alignment, special calculations, etc.

    The real-time logging program is used together with the logging service table. The work flow is like the work to be completed by the program initialization: ①Initialize the downhole instruments according to the characteristics and control commands of the various instruments provided by the service table; ②Draw the CRT according to the service table The definition of the curve drawn by the instrument, the calculation of the drawing scale of the CRT plotter and the drawing of the scale ruler and the header information; ③According to the definition of the record curve data in the service table, organize the file format header information of the data file to wait for the control command and The arrival of the interrupt signal, when the interrupt signal comes, the program enters the interrupt handler. For the deep interruption and sonic interruption processing program, the marks to be sampled in real time and the assignment of the timing circuit are given. The cyclic waiting program decides to enter the real-time sampling processing program according to the value of real-time sampling. According to the order in the service table and the sampling sequence and parameter regulations of the downhole instrument string, the measurement and the processing of the measured value (depth alignment processing filter processing, special calculation processing) , Real-time control analysis), enter the output processing program after processing, record, graph and display the measured value. When there is a keyboard input command in the loop waiting program, it will enter the real-time command processing program for command analysis and processing. In the real-time logging process, the factors that affect the real-time performance and speed of logging include the following aspects: drawing output, CRT Curve display, disk recording, interrupt processing 2.1 Drawing output program Drawing output uses the PRINTREXModel820 thermal printer recommended by China National Petroleum Corporation. The drawing program should draw logging curves during real-time logging, in order to improve the drawing speed and ensure the real-time logging The following measures can be taken: (1) Initially transfer the “ten 9’and” character dot matrix data that needs to be used in the drawing process into the memory to form a small memory font library, and avoid adjusting the dot matrix from the hard disk font library during the real-time drawing process. Data ②The drawing data output to the thermal drawing printer is directly sent to the printer interface, and the post-detection technology is adopted, that is, one batch of drawing data is output at a time, and the printer interface status is checked until the drawing data is output again. ③The Bresenham algorithm is used to draw the curve Perform smoothing processing to make the drawn curve closer to the real change of the formation. 2.2 CRT display program In the real-time logging process, the man-machine dialogue, logging monitoring and most of the functions are realized under the real-time logging CRT display program Finish. The specific functions of the real-time logging CRT display program are: ①Generate a screen window format The screen window format consists of 4 parts: the status display area in the upper left corner, the real-time logging curve display area in the upper right corner, and the command input and display area in the lower left corner. The real-time logging data display area at the bottom right is composed of ②According to the number of curves required by the logging service table, the horizontal scale of the coordinate position and the logging data, the logging curves are drawn on the screen in real time. ③The specific status of logging can be displayed in real time. The specific values ​​collected by various downhole tools correspond to the logging curve. ④ It can respond to various commands in the logging process at any time. Commands are input by keyboard and displayed in the window format command area ⑤ Can respond at any time 2 Press to freeze the d2 key and turn the page 3 key. In the real-time logging CRT display program, the logging curve display speed is mainly affected by the scrolling of the curve display area. In order to improve the running speed of the CRT display program and the real-time logging performance, directly The CRT display buffer is operated, and the assembly instruction is embedded in the (T language instruction) for the scrolling display mode of the screen to improve the speed of displaying the curve.

    2.3 The disk recording program affects the recording speed in the disk recording. The main reason is that the disk starts to find the cylinder and sector time of the written data. In the program, in order not to frequently write data to the disk, it will affect the real-time data collection, but not when the logging fails. If data is lost, open a file buffer in the memory, and temporarily store the data to be written to the disk in the file buffer. When the file buffer is full, the size of the file buffer in the disk is defined by the two depth intervals during logging. *The limitation of the difference between the small time and the maximum value of the sum of processing time, display and drawing time.

    2.4 Interrupt processing In the real-time logging process, deep interrupts, external timing interrupts and sonic interrupts are needed. The arrival of these interrupts is related to input and output operations. These operations such as graphics, CRT display, and disk recording operations occur. Input and output bus Contention will cause system instability and even crash. In order to solve these problems, the following measures are taken: ①Drawing and CRT display disk recording operations are processed within a period of time without interruption; ②In-depth interruption involving data collection Harmony wave interrupts only mark the interruption in the interrupt handler, and queue up in the main program according to the order of priority; ③All interrupt handlers only handle simple tasks, and the time of each interruption is separated to avoid interruption Nesting 3 application analysis Acoustic logging is to emit 4 times of sonic logic between two adjacent depth interrupts. The time sequence of sonic logic emission and data acquisition processing is to collect the time difference of the sonic wave. For example, when the depth interrupt is reached, the deep interrupt processing program is external The timer sets the time interval value of the transmitted sound wave logic. The time interval value is determined according to the logging speed at the time. It can be set to 100ms, 50ms, 30ms, and the external timing interruption and sound wave interruption are enabled. 1 sonic wave logic, when the sonic wave is interrupted, collect the sonic full wave train data, calculate the first sonic time difference, then the second and the third sonic logic and processing work. When the 4th external timing interruption is reached, the 4th sonic logic is emitted, Turn off the external timing interrupt, and then start processing the last sound wave collection value, and perform recording, drawing and display work, etc. When the fourth sound wave is interrupted, collect the full wave train value of the last sound wave of the depth interruption, and turn off the sound wave interruption. , Waiting for the next deep interruption. What needs to be explained is that the drawing output program and the CRT display program are drawing and displaying at the same time from the macro level, and the serial time-sharing operation at the micro level. The operation process is: ①Check the status of the plotter interface, check Whether data can be sent, when data can be sent, send the data to the plotter interface; ②Check the status of the CRT interface, check whether the data can be sent, and when the data can be sent, send the data to the CRT display buffer; ③Repeat ① and ② until all data After processing this method, the time for detecting the interface status can be reduced, and the real-time performance and logging speed of logging can be improved.

    86 CNC logging system, after dozens of well-time field tests, obtained qualified logging data. The entire system is flexible and convenient to use, easy to expand, and stable and reliable. The successful development of this system has made a meaningful step in transforming a large number of CLS3700 CNC systems imported from our country. Its economic and social benefits are very high.

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    Simply tell you how the blockchain works?

    Briefly describe the working principle of the blockchain. A wants to send money to B. This transaction is represented by a block on the network, and the block is broadcast to all participants in the network. The participants agree that the transaction is valid, and the area is changed. Blocks are added to the chain, which provides a permanent and transparent record of transactions, and funds are transferred from A to B. One account on the whole network, everyone can find it.

    Simply tell you how the blockchain works?

    How Blockchain Works

    Briefly describe the working principle of the blockchain. A wants to send money to B. This transaction is represented by a block on the network, and the block is broadcast to all participants in the network. The participants agree that the transaction is valid, and the area is changed. Blocks are added to the chain, which provides a permanent and transparent record of transactions, and funds are transferred from A to B. One account on the whole network, everyone can find it.

    What we can see is that in this distributed database, the accounting is not controlled by individuals or a centralized subject, but is maintained and jointly recorded by all nodes. All single nodes cannot be tampered with. If you want to tamper with a record, you need to control more than 51% of the nodes or computing power of the entire network at the same time. The number of nodes in the blockchain is infinite and new nodes are being added all the time. This basically is impossible.

    The essence of the blockchain is a public accounting system for mutual verification. What this system does is to record all transactions that occur in all accounts. Every change in the amount of each account will be recorded in the general ledger of the entire network. And everyone has a complete ledger in their hands. Everyone can independently count all the accounts of each account in the Bitcoin system in history, and can also calculate the current balance of any account.

    Since all data is open and transparent, anyone can view its source code, and people will trust this decentralized system without worrying about whether there is any conspiracy hidden in it.

    The 6-layer model of blockchain

    The basic model of blockchain is divided into 6 layers: data layer, network layer, consensus layer, incentive layer, contract layer, and application layer. Each layer completes a core function and cooperates with each other to realize a decentralized trust mechanism.

    Data layer: data block, chain structure, timestamp, hash function, Merkle tree, asymmetric encryption;

    Network layer: P2P (peer-to-peer) network, propagation mechanism, verification mechanism;

    Consensus layer: pow (workload proof), pos (stake proof), dpos (share authorization proof);

    Incentive layer: issuance mechanism, distribution mechanism;

    Contract layer: script code, algorithm mechanism, smart contract;

    Application layer: programmable currency, programmable finance, programmable society;

    Most of them belong to the technical category, so I won’t go into too much detail.

    Simply tell you how the blockchain works?

    The development of blockchain

    Blockchain 1.0: Programmable currency represented by Bitcoin, which refers more to innovations in the field of digital currency, such as currency transfer, redemption and payment systems;

    Blockchain 2.0: Blockchain-based programmable finance. It is more about some innovations in contracts, especially commercial contracts and innovations in transactions, such as stocks, securities, loans, clearing and settlement, so-called smart contracts, etc.

    Blockchain 3.0: The application of blockchain in other industries. It corresponds more to the transformation of human organization, including health, science, culture and blockchain-based justice, voting, etc.

    Simply tell you how the blockchain works?

    Basic types of blockchains:

    public chain

    A public chain refers to a blockchain in which anyone in the world can read and send transactions, and transactions can be effectively confirmed, and can also participate in the consensus process.

    The public chain has the following characteristics:

    1. Protect users from the influence of developers. In the public chain, program developers have no right to interfere with users, and blockchain can protect their users;

    2. The access threshold is low, anyone can access, as long as there is a computer that can connect to the Internet, it can meet the basic access conditions;

    3. All data is public by default, and each participant in the public chain can see all transaction records of the entire distributed ledger.

    Simply tell you how the blockchain works?

    private chain

    A private chain refers to a blockchain whose write permission is only in the hands of one organization, in order to limit read permission or open permission to the outside world.

    The private chain has the following characteristics:

    1. The transaction speed is very fast. The transaction speed of a private chain can be faster than any other blockchain, even close to the speed of a regular database that is not a blockchain. This is because even a small number of nodes have a high degree of trust, and each node is not required to verify a transaction.

    2. Better protection of privacy A private chain makes the data privacy policy on that blockchain exactly the same as in another database; no need to deal with access rights and use all the old ways, but at least, the data is not will be publicly available to anyone with an internet connection.

    3. The transaction cost is greatly reduced or even zero The private chain can conduct completely free or at least very cheap transactions. If one entity controls and handles all transactions, then they no longer need to be charged for the work.

    4. It helps to protect basic products from being destroyed. The use of private chains by banks and traditional financial institutions can ensure their existing interests, and even the original ecosystem is not destroyed.

    Simply tell you how the blockchain works?

    Alliance chain

    A consortium chain refers to a blockchain whose consensus process is controlled by pre-selected nodes. Only for members of a specific group and limited third parties, multiple pre-selected nodes are designated as bookkeepers, and the generation of each block is jointly determined by all pre-selected nodes.

    Several characteristics of the alliance chain:

    1. The transaction cost is cheaper. Transactions only need to be verified by a few trusted nodes with high computing power, without the need for confirmation by the entire network.

    2. Nodes can be well connected, failures can be quickly repaired by manual intervention, and allow the use of consensus algorithms to reduce block times, thus completing transactions faster.

    3. If the read permission is restricted, it can provide better privacy protection. Fourth, it is more flexible. A community or company running a private blockchain can easily modify the rules of that blockchain, restore transactions, modify balances, etc., if needed.

    Simply tell you how the blockchain works?

    Consensus mechanism of blockchain

    The purpose of the consensus mechanism of the blockchain is to solve the problem of trust, to solve the problem of trust between two complete strangers. Verification and confirmation of transactions are completed in a very short period of time through voting by special nodes.

    There are many consensus mechanisms on the blockchain, and not all of them are suitable for all specific application scenarios. Consensus needs to be discussed in specific application scenarios. Here we discuss the three most common consensus mechanisms:

    1. Proof of Work

    Short for Pow, it can usually only be proven from the results because monitoring the work process is often tedious and inefficient. Bitcoin uses the pow mechanism during block generation.

    Pow relies on machines to perform mathematical operations to obtain accounting rights, which consumes a lot of resources, has a high consensus mechanism, and is weakly regulated. At the same time, each time a consensus is reached, the entire network needs to participate in the calculation, and the performance efficiency is relatively low. In terms of fault tolerance, 50% of the entire network is allowed. Node error.

    Advantages of Pow: Completely decentralized, nodes come in and out freely

    Disadvantages of Pow: At present, Bitcoin has attracted most of the computing power in the world. It is difficult for other blockchain applications that use the Pow consensus mechanism to obtain the same computing power to ensure their own security. Mining causes a lot of waste of resources. period is longer.

    2. Proof of Equity

    Referred to as POS, the proof-of-stake mechanism works in such a way that when a new block is created, the miner needs to create a “coin right” transaction, which sends some coins to the miner itself in a pre-set ratio.

    The proof-of-stake mechanism reduces the mining difficulty of nodes proportionally according to the proportion and time of tokens owned by each node and according to the algorithm, thereby speeding up the search for random numbers. This consensus mechanism can shorten the time required to reach consensus, but essentially still requires nodes in the network to perform mining operations. Therefore, the PoS mechanism does not fundamentally solve the problem that the PoW mechanism is difficult to apply to the commercial field.

    Advantages of POS: It shortens the time for reaching consensus to a certain extent, and does not require a lot of energy to mine.

    Disadvantages of POS: mining is still required, and it does not essentially solve the pain points of commercial applications; all confirmations are only a probabilistic expression, not a deterministic thing, theoretically, there may be other attack effects.

    Simply tell you how the blockchain works?

    3. Share authorization certificate

    DPOS for short, similar to board voting, token holders vote a certain number of nodes for proxy verification and accounting.

    The working principle of DPOS, each shareholder has corresponding influence in proportion to their shareholding, the result of 51% shareholder vote will be irreversible and binding, the challenge is to achieve “51% approval” through a timely and efficient method. To achieve this, each shareholder can delegate its voting rights to a representative. The top 100 delegates with the most votes take turns producing blocks according to the established schedule. Each delegate is assigned a time period to produce blocks.

    The voting mode of DPOS can generate a new block every 30 seconds, and under normal network conditions, the possibility of a blockchain fork is extremely small, and even if it occurs, it can be resolved within minutes.

    The Internet has solved many problems that traditional business cannot solve. Blockchain can solve many problems that cannot be solved by the Internet, especially the problems of information flooding and lack of trust. These are the foundation of business.

    The Links:   EVM31-060 EP3C5F256I7N

    Does daily wear mask harmful to the skin

    Wearing an airtight mask for a long time will make the droplets during breathing and taChinaing form a local hot and humid environment around the mouth, causing dust and bacteria in the environment to adhere to the mask easily. In addition, if the mask is not replaced regularly, the pores will be blocked and the acne will be formed, resulting in the phenomenon of "mask pox". Moreover, urban pollution is becoming more and more serious. When choosing to wear masks, more and more people use fashionable masks with a sense of design and give up disposable masks. This has increased the hidden danger of facial skin. If you do not regularly clean the masks, masks are easy to hide dirt and increase the risk of acne.

     

    How to prevent the harm of mask to skin:

     

    Don't ignore chin acne. Always clean and replace the mask. In addition to avoid long face mask acne, should also pay attention to "Chin pox", it is best to wear a disposable mask with good air permeability, which is clean and hygienic. And the mask with too thick and poor air permeability, especially in the sultry environment, is easy to stimulate the skin near the chin. If it is an ordinary mask, it should be cleaned or replaced from time to time to avoid the growth of bacteria.

     

     

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    Luxshare Precision won the assembly order for the iPhone 13 series

    Recently, it is reported that Luxshare Precision has won the assembly order for the new iPhone series for the first time. This is the first time that a mainland Chinese company has participated in the assembly of iPhone mobile phones. It has been in charge of Foxconn, Pegatron, Wistron and other companies before.

    Luxshare Precision won the assembly order for the iPhone 13 series

    It is reported that Apple currently attaches great importance to Luxshare, not only taking tens of millions of assembly orders for new machines this year, but also having the possibility to increase in the future. It has the opportunity to surpass Pegatron in 2023 and become second only to Foxconn. The second largest generation factory.

    Previously, Luxshare Precision was already an important supplier of Apple’s supply chain, mainly providing Apple with electro-acoustic components, connectors, etc., mainly used in AirPods headphones.

    The Links:   LTM190EX-L31 NL13676AC25-05D

    What are the characteristics of zinc alloy die casting?

    The main added elements of zinc alloy die-casting are aluminum, copper and magnesium. Zinc alloys can be divided into deformation and cast zinc alloys according to the processing technology. Cast zinc alloys have good fluidity and corrosion resistance, and are suitable for die-casting instruments and auto parts. Shell etc.

    Features of :

    • (1) The proportion is large.
    • (2) Good casting performance, it can die-cast precision parts with complex shapes and thin walls, and the surface of the castings is smooth.
    • (3) Surface treatment can be carried out: electroplating, spraying, painting.
    • (4) When melting and die-casting, it does not absorb iron, does not corrode the pressure, and does not stick to the mold.
    • (5) It has good mechanical properties and wear resistance at room temperature.
    • (6) Low melting point, melting at 385℃, easy to die-casting.

    PTJwas founded in 1987, is leading full-service die Casting Tooling, aluminum die casting, zinc die casting, Gravity casting manufacturer. We are a solution provider offering a wide array of capabilities and services that include engineering support, designing, molds, complex CNC machining, impregnation, tumbling, chrome, powder coating, polishing, assembly and other finishing services. We will work with you as partners not just suppliers.

    •   – Full Service in Die Casting & Machining Since 1987
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    2013-07-05 15:21 CNC technology widely used

    2013-07-05 15:21CNC technology widely used

    CNC technology since its birth, by virtue of its advanced exquisite processing technology, related industries have been gradually applied, which in the machining industry’s most widely used. As we all know, the mechanical industry, particularly the high-end CNC machinery industry is the basis of modern equipment manufacturing industry, machinery industry developed or not, directly determines a country’s level of development of equipment manufacturing industry, for our country, as has long been the core technology and key components start late, lack of innovation in the field of high-end CNC machinery manufacturing industry has been relatively backward, with advances in technology, product upgrades as well as national key projects, local investment project progresses, the various sectors of the national economy cnc machine tool products, the level of demand will be further increased modernization of national defense against high-level CNC machinery demand will more pressing, CNC machinery industry has made great development, especially the development of more rapid Cnc Engraving Machine.

    With the continuous development of digital technology and the expansion of application fields of the national economy and a number of important industries, such as IT, automotive, light industry, medical and other development plays an increasingly important role, because these industries have digital equipment required is the modern trend of development. The next 10-15 years is a critical period for China to promote industrialization, power, petrochemical, metallurgy, shipbuilding and other industries the rapid development of CNC machinery enterprises gave birth to huge demand, there are some other industries such as railways, aviation, energy and other industries on CNC machinery is still there is greater demand, especially in the automotive manufacturing industry began to rise, indicating that CNC machinery especially for large and high-end CNC machinery demand is relatively strong, with the manufacturing changes in market demand, product upgrades demand the release of "revitalization plan" and "Major special "policies, constantly optimize the product structure, CNC machinery industry will be a structural recovery opportunities. It can be said that China CNC machinery coming years will be very optimistic about the development of the industry, especially in high-tech CNC machine, and gradually developed into a high-speed lane.

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