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J For the skeleton with high retaining wall or large blade, the demoulding slope should be designed to facilitate demoulding during production.
When the K skeleton has a matching Cover, attention should be paid to the size of the matching part with the cover.
L The blade in the middle of the patch skeleton bobbin should be designed with corresponding hooks to prevent the copper wire from not being in place when winding; Notches should also be designed on the blades so that the winding needle can pass through smoothly.
It is best to design a concave notch at the inlet of m, depending on the size of skeleton, and the concave notch is generally 0.5-1.0mm deep. In this way, it can avoid the influence of residual raw materials on the overall dimensions of the product. If the gap cannot be designed, add a jig for grinding the feed inlet to meet the size requirements.
N For the plastic skeleton with thick wall thickness, concave gaps should be designed in places with more plastic, so as to ensure uniform wall thickness and avoid serious shrinkage.
③ Mold design and manufacture.
A customers only develop samples as samples. Generally, the mold can be designed with one or two holes for the purpose of proofing production. If customers specially require small batch production, they can heat treat the mold or select better steel.
B for mass-produced products, the products can be arranged in a whole straight line during design, so as to facilitate the processing of mold cavities, runners and exhaust grooves.
C the matching slope should be designed for the parts where the front die, the rear die and the sliding block are matched with each other to avoid the die damage caused by direct collision.
In the deep part of the D-shaped cavity (such as the bottom bump or retaining wall), the demoulding slope and vent hole should be designed, so that the venting can be smooth during molding and the occurrence of less materials can be reduced.
E die insert specifications are as general as possible and easy to replace and clean for timely replacement and maintenance. ④ Sample detection and recognition stage. When sending samples for engineering or business, products must be strictly tested and checked:
A product size, especially important parts and wall thickness required by customers.
B strength test shows that the skeleton can reach 3Kgf in general, and the strength is relatively small when the structure is thin or the product is small.
C withstand voltage test, passing the high voltage test (such as 3.5KV,2mA,60S), can avoid poor withstand voltage caused by unreasonable material selection and wall thickness in the design stage.
D solder test, which tests the tin on the pins and the deformation and foaming of the body after an instant (1-3S) high temperature.
E product flatness, test whether the bottom bump or plane in contact with PCB is warped or not. Generally, the industry takes 0.1mmmax as the control standard, and the larger the skeleton, the flatness size can be relaxed. At present, the control of the stitch level of the patch skeleton is the strictest, because the stitch level is the control point directly related to the PCB level.