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Injection mold to design well, it must grasp the good time
by：CSSSLD
2021-01-23
Each injection products must first determine the mould at the beginning of the design direction and the parting line, to ensure that minimize the core-pulling slider mechanism and eliminate the influence of parting line on the appearance.
a, mould opening direction is determined, the product of the stiffener, card buckle, convex structure designed to open mold in the same direction as far as possible, to avoid the core-pulling reduce spell suture, extend the life of the mold.
b, mould opening direction is determined, can choose appropriate parting line, avoid open mould torque direction, to improve the appearance and performance.
draft
1, the appropriate draft can avoid products (hair, Garland) 。 The smooth surface of the draft should be zero or more. 5 degrees, thin skin ( Sand surface) Surface is greater than 1 degree, coarse skin grain surface is greater than 1. 5 degrees.
2, proper draft can avoid product injury, such as white, deformation, bursting
3 surface slope, deep cavity structure product design requirements is greater than the inside surface slope, as far as possible in order to make sure when we do the injection mold core is not offset, get a uniform product wall thickness, and ensure the material strength of opening parts of the products.
product wall thickness
1, all kinds of plastic has certain thickness range, 0. 5 ~ 4 mm, when the wall thickness more than 4 mm, will cause the cooling time is too long, to produce the problem such as printer, should consider to change the product structure.
2, uneven wall thickness will cause surface shrink.
3, uneven wall thickness can cause porosity and weld marks.
stiffener
1, the reasonable application of reinforcing rib, can increase product rigidity, reduce the deformation.
2, the thickness of the stiffener must (or less 0. 5 to 0. 7) T product wall thickness, otherwise the surface caused by shrinkage.
3, reinforcement of the single side slope should be greater than 1. 5 °, in order to avoid injury.
the rounded
1, the round corner is too small may cause stress concentration, result in the crack of the product.
2, rounded corners are too small may cause the mold stress concentration, result in the crack of the cavity.
3, set up reasonable rounded corners, can also improve the mold processing technology, such as milling cavity can be directly use r the knife, to avoid the low efficiency of machining.
4, different rounded corners may cause the movement of the parting line, should be combined with the actual situation to choose different rounded corners or Angle. Hole
1, the shape of the hole should be as simple as possible, generally take a round.
2, axial hole and cavity in the same direction, can avoid the core pulling.
3, when the hole length to diameter ratio is greater than 2, should set up the draft. When the diameter of the hole should be according to the size of trail ( The largest size entities) Calculation.
4, blind hole length to diameter ratio is generally not more than 4. The needle impact bending
5, hole and products generally greater than the aperture on the edge of the distance.
core-pulling, slider mechanism of the injection mold and avoid
1.
when the direction of plastic parts according to the mould can't smooth demoulding, should design the core-pulling slider mechanism. Can slide block core-pulling mechanism forming complex structure of products, but the spell suture, easy cause products defects such as shrinkage, shorten die life and increase the cost of the mould.
2, design, injection molding products, such as no special requirements, as far as possible avoid core-pulling structure. Such as hole axis and the direction of the reinforcement to open mold direction, by using the methods of mould core touch wear.
one hinge
1, the use of pp material toughness, hinge can be designed and products.
2, as the hinge of the film size should be less than 0. 5 mm, and keep the uniform,
3, plastic hinge, the gate design on the one side of the hinge.
insert
1, inserted into the insert in the injection molding product can increase the local strength, hardness, dimensional accuracy and setting up the small threaded hole ( Axis) To meet the special needs of various. At the same time can increase the product cost.
2, insert for copper commonly, also can be other metal or plastic parts.
3, insert embedded in the plastic part should be in the design check and pull out prevention structure. Such as: knurling, hole, bending, flattening, shoulder, etc.
4, insert the surrounding plastic should be more appropriate, in order to prevent stress cracking plastic parts.
5, designing insert, should fully consider its positioning way (in the mould Hole, pin, magnetic)
button bit
1, the button will be more than a device designed to a share at the same time, make the whole device won't because individual clasp damage and cannot operation, thereby increasing its service life, and is more filter with rounded corners, increase the intensity.
2, is a very precise size tolerance requirements, buckle the position too much easier to form button bit damage; Torque, on the other hand, too little is assembly location is difficult to control part or combination of loose phenomenon. Solution is reserved to change mould easily add glue to implement.
welding ( Hot plate welding, ultrasonic welding, vibration welding)
1, the welding, the connecting strength can be improved.
2, welding, can simplify the product design.
a, mould opening direction is determined, the product of the stiffener, card buckle, convex structure designed to open mold in the same direction as far as possible, to avoid the core-pulling reduce spell suture, extend the life of the mold.
b, mould opening direction is determined, can choose appropriate parting line, avoid open mould torque direction, to improve the appearance and performance.
draft
1, the appropriate draft can avoid products (hair, Garland) 。 The smooth surface of the draft should be zero or more. 5 degrees, thin skin ( Sand surface) Surface is greater than 1 degree, coarse skin grain surface is greater than 1. 5 degrees.
2, proper draft can avoid product injury, such as white, deformation, bursting
3 surface slope, deep cavity structure product design requirements is greater than the inside surface slope, as far as possible in order to make sure when we do the injection mold core is not offset, get a uniform product wall thickness, and ensure the material strength of opening parts of the products.
product wall thickness
1, all kinds of plastic has certain thickness range, 0. 5 ~ 4 mm, when the wall thickness more than 4 mm, will cause the cooling time is too long, to produce the problem such as printer, should consider to change the product structure.
2, uneven wall thickness will cause surface shrink.
3, uneven wall thickness can cause porosity and weld marks.
stiffener
1, the reasonable application of reinforcing rib, can increase product rigidity, reduce the deformation.
2, the thickness of the stiffener must (or less 0. 5 to 0. 7) T product wall thickness, otherwise the surface caused by shrinkage.
3, reinforcement of the single side slope should be greater than 1. 5 °, in order to avoid injury.
the rounded
1, the round corner is too small may cause stress concentration, result in the crack of the product.
2, rounded corners are too small may cause the mold stress concentration, result in the crack of the cavity.
3, set up reasonable rounded corners, can also improve the mold processing technology, such as milling cavity can be directly use r the knife, to avoid the low efficiency of machining.
4, different rounded corners may cause the movement of the parting line, should be combined with the actual situation to choose different rounded corners or Angle. Hole
1, the shape of the hole should be as simple as possible, generally take a round.
2, axial hole and cavity in the same direction, can avoid the core pulling.
3, when the hole length to diameter ratio is greater than 2, should set up the draft. When the diameter of the hole should be according to the size of trail ( The largest size entities) Calculation.
4, blind hole length to diameter ratio is generally not more than 4. The needle impact bending
5, hole and products generally greater than the aperture on the edge of the distance.
core-pulling, slider mechanism of the injection mold and avoid
1.
when the direction of plastic parts according to the mould can't smooth demoulding, should design the core-pulling slider mechanism. Can slide block core-pulling mechanism forming complex structure of products, but the spell suture, easy cause products defects such as shrinkage, shorten die life and increase the cost of the mould.
2, design, injection molding products, such as no special requirements, as far as possible avoid core-pulling structure. Such as hole axis and the direction of the reinforcement to open mold direction, by using the methods of mould core touch wear.
one hinge
1, the use of pp material toughness, hinge can be designed and products.
2, as the hinge of the film size should be less than 0. 5 mm, and keep the uniform,
3, plastic hinge, the gate design on the one side of the hinge.
insert
1, inserted into the insert in the injection molding product can increase the local strength, hardness, dimensional accuracy and setting up the small threaded hole ( Axis) To meet the special needs of various. At the same time can increase the product cost.
2, insert for copper commonly, also can be other metal or plastic parts.
3, insert embedded in the plastic part should be in the design check and pull out prevention structure. Such as: knurling, hole, bending, flattening, shoulder, etc.
4, insert the surrounding plastic should be more appropriate, in order to prevent stress cracking plastic parts.
5, designing insert, should fully consider its positioning way (in the mould Hole, pin, magnetic)
button bit
1, the button will be more than a device designed to a share at the same time, make the whole device won't because individual clasp damage and cannot operation, thereby increasing its service life, and is more filter with rounded corners, increase the intensity.
2, is a very precise size tolerance requirements, buckle the position too much easier to form button bit damage; Torque, on the other hand, too little is assembly location is difficult to control part or combination of loose phenomenon. Solution is reserved to change mould easily add glue to implement.
welding ( Hot plate welding, ultrasonic welding, vibration welding)
1, the welding, the connecting strength can be improved.
2, welding, can simplify the product design.
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