New developped PVC extrusion profile for power socket rail
others
Rounded corners and reinforced plastic
by：CSSSLD
2021-02-03
In order to prevent the outer thread screw holes split or deformation, should make the thread in the outer ring and the ring with the steps.
In some parts of the injection molding processing parts embedded in sealed, connection, the embedded parts namely says insert.
The role of various kinds of plastic insert is not the same, have a plenty of in order to increase the local strength of the plastic parts, hardness, wear resistance;
Have a plenty of in order to guarantee performance;
Have a plenty of to increase the stability of plastic shapes and sizes, improve precision and so on.
Insert the material for metal materials, commonly useful nonmetallic material.
the ideal inner radius should be in the wall thickness more than a third. Usually, internal radius should be half of the wall thickness, and outside wall of radius to thickness of 1. Five times the average radius should not less than 0. 5 mm, wall thickness ranging from two Angle to the wall, according to the average wall thickness determine the radius of internal and external wall. Plastic parts with one-side fillet in the corner, not only avoid the stress concentration, increase the strength, but also become beautiful plastic, is advantageous to the flow of plastic molding.
thread on the plastic parts can be molded directly, can also be used to shape machining after forming, at the site of the installation and more often, you should use a metal screw thread insert. Plastic pieces of the thread should be chosen with strong screw tooth size, diameter of thread is lesser unfavorable use fine thread. Especially with the fiber or cloth base make packing plastic molding thread, the strength of screw tooth tip part is often not high pure resin filling, such as the teeth carefully will influence the use of strength.
with rounded corners, mould during quenching or use won't because of stress concentration and cracking. For some parts of the plastic parts, the molding must be in the parting surface and core and cavity with position, the inconvenience made rounded corners, and use sharp corners. In order to ensure the parts without the strength and stiffness of plastic wall thickness is too big, can be set up on the plastic parts place to strengthen. Some reinforcement can improve the movement of the melt molding conditions.
to parts of the whole floor as a bearing surface is not reasonable, because slightly warp or plastic deformation can make the underside. Usually USES a foot support or frame support. Convex platform is used to enhance the hole and assembly of protruding part of the attachment. Convex platform shall be located in the edge area, and its geometry size should be small, twice the height should not exceed its diameter, and should have adequate draft. Convex sets tend to have enough strength to bear the force, when the fastening in turn should not have mutations, junction surface should be the local contact.
draft not impede the use of injection molding processing, the slope can be take larger value. Thermosetting plastics are thermoplastic plastic shrinkage is smaller, so the draft accordingly. Compression molding large plastic parts, the inner surface of draft should be bigger than the surface, to ensure the density of top flange part. Under normal circumstances, the draft is not included in the parts within the tolerance range. Plastic parts in addition to using require the use of Angle, the rest should be used as the rounded transition all the corner.
bore mutually perpendicular or oblique, should not be used in the compression molding plastic parts, and can be used in injection molding and transfer molding, but two hole cores cannot adopt Mosaic structure with each other. When forming, the small first pass core pull from both sides, then macroreticular core. When you need to set up nostril, should as far as possible to avoid side core-pulling device, in order to make the mould structure is simplified. The decorative pattern on the plastic parts, have a plenty of use need, others are for decoration.
more wonderful articles, plastic parts molding process, click directly.
http://www。 csssld。 cn//html/2017/Info_0626/615。 HTML
nantong on suye's official website: http://www. csssld。 Cn / /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
the ideal inner radius should be in the wall thickness more than a third. Usually, internal radius should be half of the wall thickness, and outside wall of radius to thickness of 1. Five times the average radius should not less than 0. 5 mm, wall thickness ranging from two Angle to the wall, according to the average wall thickness determine the radius of internal and external wall. Plastic parts with one-side fillet in the corner, not only avoid the stress concentration, increase the strength, but also become beautiful plastic, is advantageous to the flow of plastic molding.
thread on the plastic parts can be molded directly, can also be used to shape machining after forming, at the site of the installation and more often, you should use a metal screw thread insert. Plastic pieces of the thread should be chosen with strong screw tooth size, diameter of thread is lesser unfavorable use fine thread. Especially with the fiber or cloth base make packing plastic molding thread, the strength of screw tooth tip part is often not high pure resin filling, such as the teeth carefully will influence the use of strength.
with rounded corners, mould during quenching or use won't because of stress concentration and cracking. For some parts of the plastic parts, the molding must be in the parting surface and core and cavity with position, the inconvenience made rounded corners, and use sharp corners. In order to ensure the parts without the strength and stiffness of plastic wall thickness is too big, can be set up on the plastic parts place to strengthen. Some reinforcement can improve the movement of the melt molding conditions.
to parts of the whole floor as a bearing surface is not reasonable, because slightly warp or plastic deformation can make the underside. Usually USES a foot support or frame support. Convex platform is used to enhance the hole and assembly of protruding part of the attachment. Convex platform shall be located in the edge area, and its geometry size should be small, twice the height should not exceed its diameter, and should have adequate draft. Convex sets tend to have enough strength to bear the force, when the fastening in turn should not have mutations, junction surface should be the local contact.
draft not impede the use of injection molding processing, the slope can be take larger value. Thermosetting plastics are thermoplastic plastic shrinkage is smaller, so the draft accordingly. Compression molding large plastic parts, the inner surface of draft should be bigger than the surface, to ensure the density of top flange part. Under normal circumstances, the draft is not included in the parts within the tolerance range. Plastic parts in addition to using require the use of Angle, the rest should be used as the rounded transition all the corner.
bore mutually perpendicular or oblique, should not be used in the compression molding plastic parts, and can be used in injection molding and transfer molding, but two hole cores cannot adopt Mosaic structure with each other. When forming, the small first pass core pull from both sides, then macroreticular core. When you need to set up nostril, should as far as possible to avoid side core-pulling device, in order to make the mould structure is simplified. The decorative pattern on the plastic parts, have a plenty of use need, others are for decoration.
more wonderful articles, plastic parts molding process, click directly.
http://www。 csssld。 cn//html/2017/Info_0626/615。 HTML
nantong on suye's official website: http://www. csssld。 Cn / /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
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