Part Design

At Sino-Mold, we have an innovative engineering staff, which consist of over 40 engineers and technicians.We can surely complete the whole products by our advanced CAD systems only on the needing of the ideal,the description of the products function,and the put location of the electric ware from our customer.Finally will be checked and confirmed by the custumers.to make the customers get a more clear and more methodic on the our company design department 's sense and faith as following:

●Design Considerations
Part design should include draft features(angled surfaces) to facilitate removal from the mold.
Depending surface length draft angles down to half a degree are reasonable.Typical draft angles should be about 1 too 2 degrees for part surfaces not exceeding 5 inches.
Dimensional tolerance specification will govern the part cost and manufacturability.if you have a small region of the part that needs higher tolerances,say the location of a
critical feature used for alignment.DO NOT specify tight tolerance.instead design and plan for post molding processes such as machining using "assembly intent" fixturing.

●Wall Thickness
Wall thickness for thin parts such as a soda bottle or ball point pen ink insert are quite possible and economical.Thick wall sections are possible as well.Uneven wall thickness present challenges to the plastic molder manufacturing and costing.At wall intersection or "tees" sinking will occur.thick walls cool slower and greater shrinking will occur.thin walls cool faster as thus,less shrinkage.

●Radii and Corners
Maintain uniform wall thickness at corners.External and internal radius should share the same center point.External radii=internal radii+wall thickness.the minimum radii should not be less than 1/4 minimum wall thickness.Design for radii to be 1/2 to 3/4 of the nominal wall thickness.when significant stress is present,design in larger radius as larger radius distributes stress uniformly.

●Ribs
Ribs should be 1/2 to 2/3 of the nominal wall thickness and less than 3 times thickness in height.Taper of 1 deg is typical.Note:excess thickness promotes shrinkage.Excess rib height combined with taper will produce thin sections requiring extra fill time at the mold.

●Bosses    

	● Diameter=(Outside Diameter)\(Inside Diameter)=2 to 3. ● Thickness=1/2 to 2/3 nominal wall thickness. ● Gusset Height=2/3 Height. ● Height=Fastener minimum requirements. ● taper=1 deg all around. ● Diameter Ratio should be minimum ratio of 2,this will reduce risk of failure.

●Weld Lines
Location should be considered by design and the molder.Weld lines are formed at the mating of the flow fronts of the plastic during molding.the weld line area is more susceptible to cracks and stress failure.

By the way, We can also scan samples submitted if necessary.