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A spherical housing looks friendly on a shelf and is awkward on a moulding bench. There is no natural flat face to eject from, no obvious place for a gate, and every visible surface is an appearance surface because the eye travels all the way round. The white enclosure shown here is a housing for a children’s learning device, and the photographs cover it from six directions including the open front and the connector panel at the back.
The part is moulded as a single piece. The speaker grille, the display cutout, the sensor aperture and the connector openings are all formed in the same shot, and the posts and buckles that hold the internals are moulded on the inside where they cannot be seen. Nothing is glued or screwed on from the outside.
A round body has to split into two halves at the parting line, and on this part the split runs around the middle where the eye naturally falls. That makes the parting line quality worth more attention than it would get on a box-shaped enclosure. Any flash or mismatch shows up as a visible seam on a curved, glossy surface, where the same defect on a flat side wall would hardly register.
Draft is the other constraint. A sphere has no vertical walls to speak of, so the tool has to be built so the part releases cleanly without scuffing the gloss. Ejection is placed where the marks cannot be seen, and the cooling has to be even enough that the two halves shrink the same amount, otherwise the assembled housing comes out oval rather than round.
The circular grille is a dense field of small holes rather than a printed pattern. Moulding hundreds of tiny holes in a curved wall puts a lot of small pins into the tool, and every one of those pins is a place where the part can hang up on ejection or pick up a burr. The hole edges need to come out clean, because a child’s finger runs over that surface constantly.
The cutouts follow the same logic with different tolerances. The display opening has to accept a screen module with a defined gap all round. The sensor aperture has to line up with the component behind it. The connector openings at the back have to clear the plugs that get pushed into them, which on a used device happens thousands of times.
The surface is gloss with a very fine texture visible in the reflections. A polished cavity gives the gloss; the texture is what stops the housing looking like a plain plastic ball and helps hide the handling marks that a children’s product collects. Both come from the steel, so the cavity finish has to be right before the first shot, and it has to be maintained, because a polished surface degrades over a production run.
Wall thickness on a curved body is a compromise. Thin walls mould faster and resist sink, but the housing has to survive being dropped on a floor. Ribs and bosses inside do the stiffening where they can, and the thickness is kept uniform as far as the shape allows, because a thick region behind a thin one will sink and leave a visible dimple on a gloss surface.
Roundness and the parting line seam, checked against a reference sample. Grille hole quality, looked at under magnification for burrs. Fit of the screen module and the rear panel, using the actual mating parts rather than a gauge alone. Drop and flex testing on the housing where the customer specification calls for it, and a colour check against the approved master to keep re-orders matching.
Kunshan Maifeng Precision Industry Co., Ltd. reviews enclosure designs before quoting, builds the injection molds in house, and moulds single-color and dual-color parts on 36 machines from 90 to 700 tons. Send us the internal layout and the surface specification, and we will come back with a feasibility comment and a tooling proposal.
Kunshan Maifeng Precision Industry Co., Ltd. (MIF) has an investment of RMB 35 million and an independent factory of more than 5,000 m². The company operates 36 single- and dual-color injection molding machines from 90 to 700 tons, together with more than 50 sets of mold manufacturing and processing equipment. Our service, management and production team includes over 100 people.
Our parent company was established in 2008. We provide product design, mold design and manufacturing, injection molding and product assembly services for custom plastic parts, supporting both domestic and international customers.
1. Product Design
Product structure design and optimization based on customer drawings and samples.
2. Mold Design
Mold design developed around product geometry, material and production requirements.
3. Mold Manufacturing
Machining, polishing, fitting and assembly for custom injection molds.
4. Injection Molding
Single- and dual-color injection molding for project and order requirements.
5. Product Assembly
Supporting assembly services for molded plastic components.
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