Connector network for you to analyze the design of high-quality connector rubber shell composition

Engaged in connector connectors 8 years, J has some unique insights into the connector, you use the connector rubber shell in large quantities, understand the structure of the product process? Today, Huicheng yuan electronic connector company will talk to you about the considerations of the structural design of the gel shell. Connector manufacturers design the six elements of the rubber shell: 1, the main structure of the connector.　　2, the other parts rely on it to determine the spatial positioning.　　3, the insulation function between the conductor parts.　　4, size planning must take into account the molding.　　5, the selection of materials must take into account the customer's process conditions.　　6, due to the application of section needs to limit the mold into the rubber port, must be indicated in the drawing. It is the main component of the whole connector, and other parts are assembled to it. It roughly determines the appearance of the connector size, need to confirm its structural strength to withstand the end user's normal use of destructive force or customer-specified test specifications (for example: the requirement to apply the force in all directions on the external cable, can not be seen to destroy; or the installation of the screws, the application of appropriate torque can not be caused by the destruction of the screws). Since it is the main component, it naturally shoulders the responsibility of the positioning of the parts, so the dimensions and tolerances (including geometric tolerances) of the parts that are intermixed with other parts need to be determined appropriately. If an important feature (e.g., the width of a drawer for a hole for mounting a terminal) is sized by a single die, and the die can be machined by a grinder, the dimensional tolerance can be set to +/- 0.02 mm to ensure functionality. Other geometrical tolerances such as alignment, flatness, contour, etc. should also be applied appropriately to ensure functionality.

In addition to spatial positioning of the terminal by the shell, but also rely on the shell on its fixed force to produce the terminal mechanical behavior of the boundary conditions (such as cantilever beam terminal fixed end), and then in the male and female seat mating to produce the appropriate positive force, while avoiding the occurrence of the situation of the back pin. Therefore, the size and shape of the interference section between the terminal and the rubber housing must be handled with great care. The proper shape of the terminal barbs and the amount of interference are necessary to obtain the proper terminal retention force without causing deformation or rupture of the housing due to excessive interference.　　In terms of electrical function, the rubber shell shoulders the insulation function between the conductor parts, in terms of general engineering plastics impedance value, as long as the injection molding to do to get the thickness of the subsequent processing and did not cause structural damage, the plastic insulation impedance and withstand the voltage effect can be in line with the specification requirements. Only in the case of very strong hygroscopic materials or terminals pressed into the plastic barrier caused by the rupture of the plastic part of the insulation impedance or withstand voltage may occur unqualified situation, otherwise the concern is mostly exposed in the plastic outside the conductor parts of the insulation effect between, because the insulation effect of the air is far less than that of engineering plastics.　　Shell design in addition to consider the functionality of the above, but also have to consider the manufacturing of injection molding, too thick or too thin or uneven thickness are not suitable, too thick is serious shrinkage, too thin is not easy to fill the mold, uneven thickness of the liquid plastic filling flow wave front imbalance easy to cause cooling warpage. Usually, the producer is responsible for drawing a functional model with parts to the plastic mold mold design engineers, mold engineers will be based on experience to determine where to add what kind of escape material in order to improve the molding properties, but if the original design of the actual size of the meat thickness has been very small and there is a proportion of thickness disparity of the situation, the mold engineers can not rely on the escape material to adjust the producer should be to avoid such a situation occurs. Mold engineers to do a good job of escaping the material planning, should be confirmed with the manufacturer to escape the material after the structural strength is still in line with the functional requirements (sometimes in the assembly of other parts will have to strengthen the structure of the efficacy of the same should be considered, for example: iron shell rigidity is good enough, then riveted to the plastic shell, the overall rigidity will be sufficient), after confirmation and then carry out the analysis of the mold flow and molding action.　　Plastic materials are simply divided into high-temperature materials and low-temperature materials, the heat distortion temperature of the material and the general SMT process temperature to distinguish between high-temperature materials and low-temperature materials. Generally, connectors used in notebooks have to go through the SMT high temperature process, so high temperature materials must be used. In some cases, it is necessary to keep enough plane on the upper surface of the shell for customers to make the vacuum suction area for automatic insertion, therefore, it is necessary to avoid arranging the adhesive feeding point or the mold bonding line in this place, so as to avoid the failure of the vacuum suction nozzle.　　The bottom surface of the plastic case should be designed to avoid pressing on the solder paste coated on the PCB, which may cause a short circuit between the pads, hence the standoff design. In addition, standoff has another function, that is, to provide SMT type solder tail to adjust the common flatness of the benchmark, but also by adjusting the height of the standoff to compensate for the warping deformation of the shell.

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