plastic part for electronic production, plastic injection mold

plastic part for electronic production, plastic injection mold

Service Details:

  • Brand:Kayou
  • Serial Number: M-0038
  • Country of Origin:Shenzhen, China
  • Certificate:ISO9001

Payment & Shipping Terms:

  • Price Quote:Negotiable
  • Minimum Order: 1
  • Average Delivery Time:25 days
  • Payment Method:T/T
  • Package Details:Wooden Case
  • Ability to Supply:5 Set/per month
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plastic part for electronic production, plastic injection mold

Description

plastic part for electronic production, plastic injection mold

Design of Gears

The birth of new plastics materials, plastics reinforcing materials and plastics alloy materials has made some plastics materials possess mechanical strength. These materials are widely used in industrial fittings. At present, some engineering plastics in industry have met the requirements of general precision and strength of gear, among which polyamide (nylon), polycarbonate, polyformaldehyde polysulfone and reinforcing materials, alloy materials are widely used in gear injection moulding. In order to ensure that the injection gear has good formability, the outline size of the die must be specified as follows.

The flange thickness is greater than or equal to three times the tooth height.

The spoke width shall be equal to or less than the tooth width.

The hub width shall be equal to or greater than the tooth width and equal to the diameter of the shaft hole.

The outer diameter of the hub should generally be 1.0-3.0 times the diameter of the shaft hole.

In the design of gears, in order to reduce stress concentration, transition fillets are generally used instead of sharp corners in the design of cross-section dimensions. The interference fit should not be used for the plastic shaft and the plastic gear, but for the transition fit. For thin gears, uneven thickness will cause warpage and skew, and the spoke structure should be adopted at this time.

Hole design

The common holes in plastic products are through holes, blind holes and holes with complex shapes. The purpose of moulding holes on injection parts is to load other parts. Some of them have the requirement of matching accuracy, some of them are decorative, or to save some materials, and some of them are special functions of heat dissipation and ventilation.

The location of holes should not be in the weakest position of plastic products, nor can the strength of plastic parts be reduced by the setting of holes. Adequate distance should be left between holes or between holes and hole walls.

Generally, the diameter and depth of the forming hole correspond to the diameter and height of the core on the die. Molding holes are different from blind holes and through holes. The core of the blind hole corresponds to the cantilever beam on the die; the core of the through hole can be designed as a simply supported beam. Under the unidirectional compression of melt at hundreds of atmospheric pressures during injection, the thinner the cantilever-supported core is, the easier it is to bend and deform, and the position of the core is more easily offset.

Because the core can separate the filling melt, there are fusion seams on the downstream side of the hole. The mechanical properties of the fusion zone between brittle plastics and glass fiber filled plastics are very poor. Therefore, the size between the two holes and between the hole and the side wall is limited. Three aspects should be paid attention to when designing moulding holes:

For the connection holes used for assembly and fastening, a convex platform should be set up, and sometimes a reinforcement bar of the convex platform should be attached.

For rectangular holes, visible flow marks are easily formed when the plastic melt flows through the side and back of the core. It should be avoided by enlarging rounded corners.

It is better to design two-way core combination for complex holes such as sun, slope hole, step hole and tee on plastic parts.

Generally speaking, holes are formed by core. Because the core has a diversion effect on melt, the holes are easy to produce weld marks around the holes during forming, resulting in the reduction of the strength of holes. Therefore, the following points should be paid attention to in the design of holes.

The hole spacing and the distance from the hole to the side wall of the product should generally be larger than the hole diameter. The best distance between holes is more than 2 times of the aperture, and the best distance between holes and the side wall of the product is more than 3 times of the aperture. When the aperture is more than 10 mm, the minimum distance between holes and the aperture must be similar.

The wall thickness (convex platform) should be increased on the four sides of the hole to ensure the strength and rigidity of the product.

The forming method of holes is related to other shapes and sizes. For shallow holes, a fixed core at one end can be used. For deeper holes, butt joint can be used. Eccentric holes and holes with different apertures can also be formed by butt joint. Blind holes can only be formed by fixing one end.

For side concave or side hole, the form of hole should be changed to non-side concave structure as far as possible, so that core pulling is not set to form.

 

 

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plastic part for electronic production, plastic injection mold

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