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Skeleton production stage
1) injection molding
In the process, melted bakelite raw materials and plastic materials at high temperature are sprayed into the cavity of the skeleton mold through the pressure of the injection molding machine, and the skeleton is separated from the mold through the ejection system after a certain molding and cooling time. The key points of the process control are the temperature and pressure during injection and the ratio of recycled materials in plastic materials. The change of injection temperature and pressure will definitely affect the change of basic dimensions, strength and characteristics of products, as well as the thickness of burrs. The thickness of burrs will also directly affect the operation of the next process. This process can be imported from PQC to SPC to monitor this series of changes, so as to find out the changes and make corresponding adjustments as soon as possible, thus ensuring the quality of products. The finished molds need to be cleaned and maintained in time to prolong the service life of molds and bring more benefits to enterprises.
In addition, with the increasingly stringent environmental protection requirements, it is more important to control raw materials (including recycled materials, environmental protection materials and non-environmental protection materials). How to avoid the pollution of non-environmental protection materials to environmental protection materials will be the focus of subsequent processing enterprises. A enterprises do not buy or produce non-environmental products, which is of course the most effective.
B a detailed record of the feeding condition during molding, such as the model, batch number, time and quantity of the feeding material. C strictly manage recycled materials, and try to make the model and batch number of recycled materials consistent with the original packaging bag.
D Distinguish the pulverizer and mixer according to the series or model of raw materials (such as PA, PBT, PET, etc.), so as to avoid the mutual pollution caused by the uncleanness of the machine.
E reduce or do not use outsourced release agents and lubricating oils that have not passed the environmental inspection.
F try to use natural raw materials for production, and avoid using masterbatch. I believe everyone is familiar with the environmental protection case of Foshan Lida Toys Factory.
② rough edge treatment
This process is mainly aimed at bakelite skeleton. In order to smoothly exhaust the gas generated in the molding process, we need to add an exhaust groove on the mold, and the melted raw materials fill the exhaust groove under the action of high pressure, so we need to use a burr processor to treat burrs through a specific process. In the control of burrs, we need to measure the size of products to determine whether the size of the skeleton is affected by the thickness of burrs; In addition, it is generally judged whether the burrs can be cleaned by whether they are transparent or not.
In the process of rough edge treatment, we should select the size of sand according to the structural characteristics of the product, such as the size of the trough and the blade strength of the product. Otherwise, it will cause sand particles to get stuck in the wire slot and block the copper wire, or get stuck in the pin hole and affect the working procedure of the next pin. Try not to carry out burrs after inserting pins, otherwise the verticality of pins will be affected.
For plastic products, only through manual processing. SMD bakelite products can be processed by a tunnel burr machine first, and then the burrs adhered to the terminals can be manually removed.
③ pin
PIN insertion, also called pin planting, is mainly to make the reel-type wire pass through the whole wire jig, the dotting jig and the main jig of the cutting die of the needle inserting machine. At the same time, the product is sent to the bottom seat by the feeding rod from the runway, and the bottom seat moves upwards through the needle inserting machine device to cooperate with the cutting die. The cut-off stitch will be inserted into the corresponding pinhole of the product at this time. In this process, the pulling (pushing) force of stitches can be increased by adjusting the dotting jig, and the cutting die can be adjusted to meet the needs of customers for stitch length. In the whole process, if there is a problem in a certain detail, there will be a series of quality problems, such as needle bending (not straightened, curved), needle scratching and copper exposure, dot exposure, insufficient pulling (pushing), foot length change, less needles, breakage, crack or cracked foot, etc. Therefore, the whole process of inserting needles is also very important. For the insertion process of L-shaped needle, it is necessary to add leveling jigs on both sides of the bottom seat, which can be driven by air cylinders to work; For the insertion process of the U-shaped needle, besides the L-shaped needle process, it is necessary to add a flattening jig at the rear section of the base for flattening to ensure the flatness of the formed U-shaped needle. For pins of plastic products, it is necessary to add escape holes on the side to communicate with the bottom of the pin hole during product design. To prevent the pin from dropping or completely dropping after soldering the pin.