Equipment and transformation Jinan Mechanical Workers University Xu Jiqing Jinan First Machine Tool Plant Tanhao X6132 milling machine CNC transformation transformation X6132 milling machine into CNC milling machine, the main transformation is: the main motor end face installed electromagnetic clutch, in order to control the spindle Stop; the vertical and horizontal feed motion of the workbench is changed to a stepper motor to control the vertical feed motion, still using maneuver and manual mode.
The CNC system used in the transformation and development is the most recent IKBC2-VI CNC system. It is mainly composed of the main control system and the display system. In these two parts, a new type of single-chip CMS90G2 is used as the central processing unit. It can be compatible with the MCS-51 system MCU with fast pulse programming algorithm. It adopts CMCB technology and the maximum working frequency can reach 40MHz (this design uses 18MHz).
The main control system is used to control: the input and output of the keyboard; the overtravel side door of the workbench in the XY direction is closed; the query; the phase spindle of the stepping motor is reversed and forwarded by XfflY. It is mainly composed of a central processing unit CMS90C32 program memory 27256, a data storage device 6264, two programmable interface chips 8255, two pieces of 74LS273 and the like. (As shown in the attached file) There is no program memory in the CPU of this system, only 256 bytes of RAM, so it needs to be extended. 27256 is used as program memory (capacity is 32KB) and 6264 is used as data memory. The P0 and P2 ports of the CMK90G2 are used to transfer the address and data to the external memory.
The port transfers low 8 memory addresses and data. The transfer of the lower 8-bit address and data is done by the latch 74LS373. When ALE is high, the input and output of the latch are transparent, that is, the input low 8-bit memory address appears at the output to be sent to the bank as early as possible. When the ALE terminal of the CPU goes from high to low, the lower 8 bits. The address is latched in the 74LS373, and the output of the 74LS373 is no longer interrupted and externally componentized with the input variable clock circuit, so that the P. port can be used as a data port to transfer read and write data.
The port of 0\902 keeps sending the upper 8 bits of memory address throughout the fetch cycle. The P2 port of the 4LS373 and GVS90G2 sends out a 16-bit address (ie, the system's address bus). Since the memory space of the program memory is the address pin of the 32KB address range, the chip select terminal of 27256 is directly connected to the 15th bit address. This is because in the effective address space, 'always low, the memory chip can be selected.
The PSEN of the GVS90G2 is connected to the CE end of the 27256, so that the contents of the program are stored. The WR pin is connected to the WE6 of the 6264, and the RD pin is connected to the CE of the 6264 to implement reading and writing of the external data memory.
The P. port and P2 port of GVS90G2 have been used to transfer the address and data of the external memory, while the P3 port is used to generate the read/write control line of the external memory, and the other bits are used to implement serial communication, interrupt, etc. The input and output ports must be extended. The 8255 chip is a general-purpose parallel interface circuit that can be programmed to select its logic functions. It contains three 8-bit parallel ports: PA, PB, and Pc. The first 8255WPA port is used as an output port, and the keyboard column line is controlled as a key scan port, and the PBa line is used as a key input port. The second piece 8255 is used to control the overtravel of the table in the XY direction, side door closing, query, page turning, insertion, pause, and the like.
The 74LS273 is an 8D flip-flop with a clear terminal. The latch function is only available when the clear terminal is high. The latch control terminal is CLK and the rising edge is latched. The first piece 74LS273 controls the spindle forward and reverse and emergency stop, the cooling pump starts and stops the second piece 74LS273 to control the X and Y direction step motors.
The display system is used to control the H716501 liquid crystal display. It is mainly connected to the main control system by the central processing unit GVS90G3 (the second chip), the program memory 27256 data memory 6264, and the liquid crystal display H716501CM90G2 and 27256, 6264. The data line of the system is connected to the display H716501. H716501 Donghuahai Electric Appliance Co., Ltd. (original mountain Zhu Yachuan vacuum switch factory).
It is a member of the National Standardization Technology High-voltage Switchgear Standardization Technical Committee.
Shandong high-tech gold industry, the company has advanced CNC cutting. Rush. Modern production technology equipment such as folding gold processing equipment and electroplating coating. High standard test methods. Strong scientific and technological development strength, Shanshan's ISOSXKE quality assurance system has been established since 19M with S. and universities. Hey, cooperate. Continuously increase the development of æ–© products.
The main products are indoor and outdoor SS vacuum cut low S switchgear. Double laminated vacuum handcart refused. Transformer. Grounding switch. AC frequency conversion speed control complete set of closed armor B and other six series, more than 20 varieties of more than 100 specifications. People are the foundation. Quality M is the subject. S guest is God. The letter* is life" for Zong S, providing quality and superior quality to the monthly household. The technology-leading products and thoughtful service are widely used in electric power, metallurgy, petrochemical, coal, transportation, etc. and exported to Pakistan. Malaya, etc. 1. It is a Sinopec Oil and Gas Group Company and a Sinopec Group Company's electrical equipment and a plant. It has been established by the Guomao G Trade Committee, the M National Urban and Rural Network, and the Cleaner-Study Equipment Products and Manufacturers List Shandong Huahai Electric Appliance Co., Ltd. (formerly Shandong Luanchuan Vacuum Switch Factory) is a dot matrix liquid crystal display with low power consumption and small display information. ET address: Luzhong Driving Training Center, Zichuan District, Zibo City, Shandong Province (255188 ) Tel: Sales Office (0533) 5430178
(Finish)
PCB Assembly Service
Jinghongyi PCB: PCBA, PCB Assembly, Printed Circuit Board Assembly Services Provider.
Jinghongyi PCB is a leading PCB manufacturer and assembler in China. It provides one-stop PCB manufacturing and PCB assembly services, including PCB Prototype manufacturing, small and medium batch manufacturing, and Prototype PCB Assembly Services, Quick Turn PCB Assembly, Low Volume & Small Batch PCB Assembly, Middle Volume PCB Assembly, High Volume PCB Assembly, Turnkey PCB Assembly Service (including PCB production, component procurement, assembly, quality management, etc.), Lead Free PCB Assembly, Multilayer PCB Assembly, LED Lighting PCB Assembly with High Quality, Reasonable Price and Fast Turnover Time Ability.
What Does PCB Assembly Mean?
Printed circuit board assembly, also known as PCBA, is the process of mounting various electronic components to a PCB. A circuit board prior to assembly of electronic components is known as PCB. Once electronic components are soldered, the board is called Printed Circuit Board Assembly (PCBA). The traces or conductive pathways engraved in the laminated copper sheets of PCBs are used within a non-conductive substrate in order to form the assembly. Attaching the electronic components with the printed circuit boards is the concluding action before using the fully operational electronic device.
PCB Assembly Service in China
JingHongYi PCB (HK) Co., Limited is a professional PCB assembly manufacturer in Shenzhen, China, offers one stop quick turn, high-quality, low volume yet affordable Printed Circuit Board (PCB) Assembly Services, Specializing in prototype PCB manufacture and assembly all-in-one. Ideal for engineering firms, makers, Kickstarter projects and students. Get a Quote!
Although there are many companies in the United States, Britain, India, Australia, Canada, Mexico, Taiwan, Malaysia, Thailand, Germany, Romania and other local selection of PCB assembly manufacturers, but they are not cheaper than assemble in China, because China's PCB assembly cost is lower, better quality.
Why Choose US for PCB Assembly Services - Turnkey, Quickturn PCB Assembly Service
Turnkey Services
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Instant Online Quote
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Affordable Pricing
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In-house PCB Manufacturing
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Authentic Parts Procurement
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Stencil and Assembly Services
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Contact our online customer service or send us an email.
We offer 7*24 hours of online real-time quotation and online customer support.
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We have many years and rich experience in PCB production and assembly. There are very professional technicians and operators, with very advanced PCB assembly process, they are the guarantee of product quality. On this basis, we can also provide you with cheaper, better quality products.
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Quick-Turn assembly
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100% Quality Guarantee
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Mature Capabilities
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Get the entire PCBA produced in 20 working days from order confirmation to dispatch, including sourcing of parts. However, if you need faster delivery time, we can do it, but you may need to pay an additional premium.
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100% quality guaranteed - free re-work if needed. All parts are sourced from reliable suppliers, and each board undergoes free visual inspection. X-ray inspection, AOI testing, In-Circuit Testing (ICT), and functional testing are also available.
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JHYPCB's assembly lines are fully compliant with IPC-A-610F, are capable of SMT, through-hole and mixed assembly, and can solder BGA and fine-pitch components from 0.38mm pitch. PCB types include rigid, flexible, rigid-flex and aluminum boards.
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Prototype, Small or Large Batch
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Sourcing Options
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Considerate Customer Service
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Whether you need prototype PCB assembly or bulk assembly, JHYPCB can cater for as little as a single piece 1 to 10000 pieces and has dedicated assembly lines for both low and high volume needs.
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We can source components from reputable distributors, or you can choose from us. These parts are cheaper and can reduce the entire PCBA production time to 7 working days.
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Every PCBA order is assigned a project manager to assist you with the order process. The engineering and assembly teams will also communicate any issues with you to ensure your order proceeds as planned.
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PCB Assembly Capabilities
We have extensive experience with lead-free and RoHS electronic assembly. Lead-Free presents challenges beyond the traditional leaded PCB assembly. We can guide you through the process and help you produce fully RoHS compliant PCB assemblies.
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Prototype PCB Assembly as Quick as 1 Day
Our printed circuit board assembly service is China's leading one-stop solution for PCB and assembly under one roof; specializing in small and medium runs with fast lead-times and no minimum quantity requirements.
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A Seamless Process from PCB fabrication to PCB Assembly
All printed circuit boards assembled by JHYPCB are maded and we maintain full control of the entire process so you don't have to manage multiple vendors. When you choose JHYPCB, you can be sure that your PCBs flow directly into our in-house Assembly Department to begin assembly without delay.
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Surface Mount (SMT) Assembly
We are capable of small volume SMT prototyping PCBs with both automated and manual assembly.
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Ball-Grid-Array (BGA) Assembly
We are equipped with advanced automated BGA placement equipments as well as X-ray inspection equipments to guarantee the quality of BGA assembly.
Components are placed by inserting leads into holes that covered with solder. Both automated and manual through-hole assembly are available.
Both SMT and Through-Hole components will be placed on the PCBs. Single or double side mixed assembly is available.
PCB Types for Assembly
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Prototype PCB Board
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FR4/ Rigid PCB Board
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Aluminum PCB Board
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LED PCB Board
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Flexible PCB Board
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Rigid Flex PCB Board
Lead-Free (RoHS compliant)
From 8 hours to 72 hours once all parts are ready
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Ball-Grid-Arrays (BGA) of 0.25mm pitch with x-ray testing
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Passive components as small as 01005 (0402) package
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Fine-pitch components as small as 0.38mm pitch
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Visual Inspection
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X-Ray Inspection
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AOI Testing
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In-Circuit Test
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Functional test
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More than 10,000 in-stock components (OPL)
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Digikey, Mouser, TME, Element 14 and more-
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PCB Assembly Testing Capabilities Learn More
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Category
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Product Function
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Test Type
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Test Location
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MCU
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51 serial MCU
AVR serial MCU
ARM Cortex M0, M0+, M3 and M4 serial
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IC Programming
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JHYPCB's Fab
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General
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GPIO Functional Testing
Voltage, Electricity Current, Resistance Test, etc.
I2C/Uart/SPI/CAN/One Wire/SWD
Temperature, Humidity, Atmospheric Pressure etc. ...
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Functional Test
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JHYPCB's Fab
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Communication
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GSM/WCDMA/LTE
GNSS
Bluetooth/LE
Ethernet
NFC
802.11/b/g/n/a/ac
ZigBee
Sub-1 GHz 315/433/868/915
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Functional Test
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JHYPCB's Fab
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Monoboard Computer
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BeagleBone, Raspberry Pi, etc.
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Functional Test
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JHYPCB's Fab
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Certification
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FCC, CE, GS, TELEC etc.
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Regulatory
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Accredited Third-Party Lab
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PCB Assembly Applications
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Aerospace
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Automotive
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Biomedical
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Consumer-electronics
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Energy
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Industrial
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Network-computer
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Telecommunications
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PCB Assembly Manufacturing Design Tips
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Choosing between ROHS (LEAD-FREE) or standard (LEADED) solder
JHYPCB is able to produce both RoHS and Leaded Solder boards. In terms of rework and removing components,leaded solder is easier to deal with. It also offers a cleaner, shinier finish.
RoHS is used most frequently when shipping to Europe. As RoHS and Leaded solder temperatures are different, boards must either be completely soldered with RoHS or Lead. This includes BGAs. Non-RoHS components can withstand RoHS process. Avoid mixed process; that is, mixed solder. For example, a standard HASL bare board should not use a RoHS assembly process.
Aqueous clean process uses water soluble flux during soldering. The board is cleaned using water. This process yields shinier solder joints and an overall cleaner looking PCBA, without any flux residue.
Use No Clean Flux only if your PCBA has some parts (batteries, microphones, speakers, relays, etc...) that can be damaged if submerged in a water wash. No Clean Flux leaves flux residue on the finished PCBA; however, flux is non-corrosive and non-conductive.
If a few components are water sensitive, you may choose to have the PCBAs processed with water soluble flux without initially soldering the water sensitive components. Make sure include specific instructions to hand solder these few components after cleaning with No Clean Flux.
If silkscreen for assembly is not provided, full assembly drawing is required. While we assemble boards without silkscreen, we will have to bypass inspection. Errors may occur.
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Placement (X-Y) Centroid Files
If you do not send centroid files with you CAD data, we can extract them for an extra fee.
Kit audit reports are given within 24 hours.
1mm circular pad on board. Ideally, three anywhere on board -- as far away from each other as possible. They should not form an isosceles triangle. For arrays, it's preferred that they are not on rails.
Inspect parts indicators: whether parts are usable straightaway. If they are not, JHYPCB uses a baking procedure to remove all moisture.
We will use customer-supplied paste layers, when present. If they are not provided, we will create them. When creating paste, JHYPCB does not require customers' approval before usage.
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Multi-part Assembly orders
Generally, we do not allow multi-part assembly orders. For an acceptable multi-part assembly order, combine BOMs and Centroid Files, and make sure reference designations are not duplicated.
JHYPCB will notify and seek approval from customers before making substitutions for components.
PCB Assembly Cost
PCB assembly cost has its standard calculation method, which includes cost of PCB manufacturing, component, SMT/DIP assembly, test and logistics. In terms of small prototype order, engineering cost will be charged. Flying probe or frame test for PCB manufacturing, stencil and regular 5% loss of components during PCB board assembly process should be also concerned. For PCB board assembly test, it depends on the test plan and duration of completing one board.
PCB Assembly Cost = PCB manufacturing cost + PCB frame test or flying probe test fees + PCB engineering cost (only for small prototype order) + Component cost (additional 5%) + SMT assembly charges + PCB assembly test cost + Box building charges + Package cost (for special application) + Logistics cost (requested)
PCB Assembly Process
PCB Assembly Process
PCB Assembly Process Flow Chart
Things Needed for Printed Circuit Board Assembly
Following electronics parts and consumables are needed for PCB assembly
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Printed Circuit Board
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Electronic components
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Soldering materials including solder wire, solder paste, solder bar, solder preforms (depending on the type of soldering to be done)
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Soldering flux
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Soldering equipment including soldering station, wave soldering machine, SMT equipment, inspection and testing equipment etc.
Once all of the above equipment, electronic parts and all raw materials are arranged, it is time to start the printed circuit board assembly process.
1. PCB Manufacturing
PCB design & fabrication helps you with experienced PCB design and fabrication, high accuracy, quality control. In general, your PCB prototype can be well served by us. PCB Assembly includes layout, fabrication and assembly. We also have monthly abilities of offering 35,000 square meters PCB, 80 million point SMT and introduce ICT, flying probe, AOI, X-ray, function test, burn-in test into inspection phase. We can help you with a system of transforming natural resources, raw materials and components into a finished product that is delivered to the end customer and strive to have the most optimized supply chain to make efficient and costs lower.
2. Screen Printing of Solder Paste onto PCB Board
loctite solder pastePhysicochemical and process property of solder paste directly impact SMT soldering quality. Solder paste printing is applicable for placing appropriate amount solder paste onto PCB pads, in order to ensure good circuit connection between SMT components and PCB pads and their mechanical strength. Solder paste printing is the critical process of SMT. Metal template printing is conventionally applied so far. According to related statistics, 60%~70% quality problems are caused by solder paste printing in premise of quality guarantee of components and printed circuit board. Requirements of solder paste printing:
a. Place solder paste appropriately, evenly and uniformly. Solder paste shape is clear and neighbor shapes do not connect. Solder paste shape is in compliance with that of pad, without any dislocation.
b. In general, the unit area solder paste amount should be 0.8mg/mm2, particularly 0.5mg/mm2 for narrow-pitch components.
c. After solder paste printing, the shape has no heavy collapse and edges are trim. Plate surface is not allowed to be contaminated by solder paste.
There are a large variety of solder paste with different alloy compositions, granularity and viscosity even for all from one manufacturer. How to choose appropriate solder paste highly impacts the product quality and cost. Now NOD Electronics is using Loctite lead free solder paste. We have figured out Loctite solder paste is reliable to ensure good product quality after process engineering test of its printability, demoulding, thixotropy, cohesiveness, wettability, welding spot defect and residue.
3. Lead-free PCB Assembly
In light of environmental concerns and customer request, we can offer lead-free PCB board assembly which complies with RoHS standards. At upstream, we choose PCB laminates in compliance with RoHS standards for PCB manufacturing. Also we use lead free solder paste and related reflow/wave ovens. We strictly fulfill RoHS requirements in light of your local regulations and don`t want to make you into any trouble on this basis.
4. Burning Program and In-Circuit Test (ICT)
Our test engineers will check short circuit, voltage, current, signal transmission of PCB assembly boards according to your ICT test plan. A professional report will be handed up to you if for any detected problems. For batch order, we design exclusive test frames to fast the ICT test process. We are also well sophisticated with decoding and burning program for you. Related test frame will be built to ensure products work effectively according to your requirements.
PCB Assembly Requirement List
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No.
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Types Of
Assembly
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File Format
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Component Footprinr
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Component Package
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Testing Produres
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Produres
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Others
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1
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SMT ASSEMBLY
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Gerber RS-274X
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0201,0402,0603-
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Reels Package
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Visual Inspection
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Lead-Free(Rohs)
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Custom Reflow Profile
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2
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SMT & THT Assembly
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BOM(.xls,.csv,.xlsx)
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BGA,QFN,QFP,PLCC
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Cut Tape Package
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X-Ray Inspection
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Leaded Solder
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Standard Reflow Profile
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3
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2 sided STM,THT Assembly
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Pick-N-Place/XY file
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SOIC,POP...Connectors
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Tube and Tray
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AOI,ICT(In-Circuit Test)
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Reflow Soldering
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Smallest Size:0.2"x0.2"
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4
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Mixed Assembly
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Small Pitch of 8 Mils
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Loose parts and bulk
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Functional Testing
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Wave Soldering
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Largest Size:15"x"20
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Find Out More
PCB Assembly Process
BGA Assembly Services
PCB Assembly FAQ
Surface Mount (SMT) Assembly
Flexible PCB Circuit Board Assembly
Through Hole Technology Assembly
Mixed Technology PCB Assembly
Double Sided PCB Assembly
Learn More Information
How to Mixed Technology PCB Assembly
Comparison between THT Assembly and SMT Assembly
How to start to Prototype PCB Assembly
Introduction About Single-sided and Double-sided SMT Assembly
How to ensure a smooth PCB assembly
How to Reduce PCB Assembly Cost
Printed Circuit Board Assembly, PCB Assembly Service, PCB Assembly
JingHongYi PCB (HK) Co., Limited , https://www.pcbjhy.com
