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Compression molding parts
by：CSSSLD
2021-02-03
Determining the direction of pressure of injection in the mold processing shall ensure the strength of the molding parts, to prevent deformation of molding parts, especially the slender core to avoid the radial stress, complex shape generally should be placed in the lower die.
Because of the pressure on the punch force is bigger, so the punch shape as simple as possible.
Along the direction of the pressurized plastic parts dimension due to excessive edge thickness and add capacity is different and change, therefore, the size of the high accuracy of unfavorable design on the compression direction.
use half overflow type compression mould, the shape of the punch can not with the appearance of plastic parts to determine, so easier than not overflow type compression molding. And because the charging chamber plastics section of a large size, punch along the mold cavity wall friction, not scratch cavity surface, so out no longer damage parts outside surface. In addition, the density of plastic parts is better than overflow type compression mould, and is easier to ensure accuracy of the size of the height direction.
when parts through long, still can appear plastic pieces in the middle of loose phenomenon, this is a plastic parts can be placed horizontally, adopts the method of lateral pressure, the lateral pressure can produce two outer circle on the surface of plastic flash and affect the appearance. When the plastic with embedded parts, priority should be given to insert embedded in the molding parts, such not only can make the operation convenient, and can use insert out plastic pieces, don't leave any influence on plastic ejection trace appearance; On the other hand, if install the insert in the mould, not only make the operation inconvenient, and insert is easy to loose, fall damage the mould.
with loading board compression modulus and compression modulus between overflow type between overflow type compression modulus, many advantages of both these two molds. It is mainly composed of punch and die and loading board and loading board together constitute a charging and concave die cavity. Loading board is a floating plate, hanging between the punch and cavity die. Although its structure is more complex, but the overflow type compression mode is more suitable for the materials of high compression ratio, and the density of plastic parts; Compared with half overflow type compression molding, mould cavity after a shallow, easy to take out the plastic parts and put insert, at the same time open mold after extrusion on the edge of the waste, easily cleaned, can avoid the premature failure.
shape and choose the parting surface and determine the direction of pressure and mould institutions have close relationship. When plastic parts along the height direction accuracy requirement is high, appropriate USES half an overflow type compression molding. Transverse flash at parting surface, easy to guarantee high precision. When radial high dimension accuracy requirement, the plastic parts should be considered flash thickness influence on precision plastic parts. If plastic vertical parting surface, easy to guarantee, water share the profile for flash thickness is not easy to control and influence the precision plastic parts.
don't overflow type compression modulus generally should not be designed more cavity die, because the material is a bit uneven can cause the cavity pressure caused by the range of some of the parts under voltage. Don't overflow type compression molding another disadvantage is the punch and cavity wall with friction between feeding, wall is easy to damage, the ejection on the surface of the plastic injection processing and easy to damage. Don't spill type compression modulus must be equipped with ejection device, or a difficult demoulding. Not overflow type compression mode is suitable for the compression ratio is big, poor liquidity of plastic, such as cotton, glass cloth or long fiber filled plastic, it can also be applied to compress complex shape, thin wall, long process and deep cavity plastic parts.
plastic mould in the direction of pressure, the punch direction. Determining the direction of pressure of plastics within the mold, should pay attention to make the hydraulic transmission distance is not too long, to avoid the pressure loss. For example, for cylindrical parts, pressure generally should be consistent with its axis direction. But when a long plastic, is not easy to the molding pressure evenly role within the scope of the length, if the pressure from the top of the plastic parts at the bottom of the pressure is small, easy to loose material, or insufficient corner filling occur. Though not overflow type compression modulus can be used at this time, increasing the cavity pressure or use upper and lower two punch two-way pressure, in order to increase the compactness of at the bottom of the plastic parts.
more excellent articles: compression molding process, click directly.
http://www。 csssld。 cn//html/2017/Info_0705/624。 HTML
nantong on suye's official website: http://www. csssld。 Cn / /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
use half overflow type compression mould, the shape of the punch can not with the appearance of plastic parts to determine, so easier than not overflow type compression molding. And because the charging chamber plastics section of a large size, punch along the mold cavity wall friction, not scratch cavity surface, so out no longer damage parts outside surface. In addition, the density of plastic parts is better than overflow type compression mould, and is easier to ensure accuracy of the size of the height direction.
when parts through long, still can appear plastic pieces in the middle of loose phenomenon, this is a plastic parts can be placed horizontally, adopts the method of lateral pressure, the lateral pressure can produce two outer circle on the surface of plastic flash and affect the appearance. When the plastic with embedded parts, priority should be given to insert embedded in the molding parts, such not only can make the operation convenient, and can use insert out plastic pieces, don't leave any influence on plastic ejection trace appearance; On the other hand, if install the insert in the mould, not only make the operation inconvenient, and insert is easy to loose, fall damage the mould.
with loading board compression modulus and compression modulus between overflow type between overflow type compression modulus, many advantages of both these two molds. It is mainly composed of punch and die and loading board and loading board together constitute a charging and concave die cavity. Loading board is a floating plate, hanging between the punch and cavity die. Although its structure is more complex, but the overflow type compression mode is more suitable for the materials of high compression ratio, and the density of plastic parts; Compared with half overflow type compression molding, mould cavity after a shallow, easy to take out the plastic parts and put insert, at the same time open mold after extrusion on the edge of the waste, easily cleaned, can avoid the premature failure.
shape and choose the parting surface and determine the direction of pressure and mould institutions have close relationship. When plastic parts along the height direction accuracy requirement is high, appropriate USES half an overflow type compression molding. Transverse flash at parting surface, easy to guarantee high precision. When radial high dimension accuracy requirement, the plastic parts should be considered flash thickness influence on precision plastic parts. If plastic vertical parting surface, easy to guarantee, water share the profile for flash thickness is not easy to control and influence the precision plastic parts.
don't overflow type compression modulus generally should not be designed more cavity die, because the material is a bit uneven can cause the cavity pressure caused by the range of some of the parts under voltage. Don't overflow type compression molding another disadvantage is the punch and cavity wall with friction between feeding, wall is easy to damage, the ejection on the surface of the plastic injection processing and easy to damage. Don't spill type compression modulus must be equipped with ejection device, or a difficult demoulding. Not overflow type compression mode is suitable for the compression ratio is big, poor liquidity of plastic, such as cotton, glass cloth or long fiber filled plastic, it can also be applied to compress complex shape, thin wall, long process and deep cavity plastic parts.
plastic mould in the direction of pressure, the punch direction. Determining the direction of pressure of plastics within the mold, should pay attention to make the hydraulic transmission distance is not too long, to avoid the pressure loss. For example, for cylindrical parts, pressure generally should be consistent with its axis direction. But when a long plastic, is not easy to the molding pressure evenly role within the scope of the length, if the pressure from the top of the plastic parts at the bottom of the pressure is small, easy to loose material, or insufficient corner filling occur. Though not overflow type compression modulus can be used at this time, increasing the cavity pressure or use upper and lower two punch two-way pressure, in order to increase the compactness of at the bottom of the plastic parts.
more excellent articles: compression molding process, click directly.
http://www。 csssld。 cn//html/2017/Info_0705/624。 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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