New developped PVC extrusion profile for power socket rail
others
The cavity wall thickness
by：CSSSLD
2021-02-03
Can be used for small simple movable mould, guide pin to transition fit into the fixed plate, willow socket fixed installation form again.
According to the need, lead the guide pillar and shoulder guide pin down sliding part can be processed out of the storage tank.
In forming high accuracy, large, thin wall, deep cavity injection molding processing parts, the lateral pressure inside the cavity will often cause core or cavity of migration, if the side has the guide pin to withstand pressure, can lead to guide pin stuck or damage, so at this time should be cone positioning mechanism.
Cone with two forms: one kind is two cone parts with the hardening of parts;
Another kind is two cone directly to cooperate, at this point, both cone should be reached a certain degree of hardness, heat treatment to increase the wear resistance.
molding parts of wall thickness calculation is a problem often encountered in the design of the mould, especially for large mold is more outstanding. Theoretical analysis and practice proved that mould is not to the requirement of strength and stiffness to both. For large size cavity, insufficient stiffness is the main problem, should press stiffness calculation conditions, for small size cavity, insufficient strength is the main problem, should according to the condition of strength calculation. Strength calculation condition is to meet all kinds of stress under the allowable stress.
the wall thickness of molding parts generally used calculation method and the look-up table method, but calculation method is tedious, the calculated result is close to and empirical data. According to the mold shape and size, a plastic mold usually need to 2 - guide pin number 4. Four commonly used size larger mould guide pillar, small mould usually use two guide pin. Guide pin diameter should be selected according to mold size, must make the pledge that we shall have sufficient strength and rigidity. The structure of guide pillar with plastic mould structure, size and production batch requirements vary, the structure of the commonly used have lead the guide pillar and shoulder guide pin.
when high pressure plastic melt injection mold cavity of some of the fitting surface will generate enough to flash gap. In order to make the cavity will not happen by die elastic deformation material overflow, at this time should be according to the maximum of different plastic material overflow clearance to determine its stiffness conditions. Low viscosity such as polyamide, polyethylene, polypropylene plastic, which allows clearance to 0. 025 - 0. 04mm； For the medium viscosity such as polystyrene, ABS plastic to 0. 05mm； The polysulfone, polycarbonate, the high viscosity of rigid polyvinyl chloride plastic is 0. 06 - 0. 08mm。
should guarantee the precision of plastic parts, plastic parts are all in size requirements, especially the high accuracy of small plastic pieces, which requires the mold cavity has the very good rigidity, i. e. plastic injection do not produce the large elastic deformation. Maximum elastic deformation parts 1/5 of the allowed tolerance, preferable in common small and medium-sized plastic parts of tolerance to 0. 13 - 0. 25 mm, thus allowing the elastic deformation of 0. 025 - 0. 5 mm, can press parts size and precision grade.
in the processing of plastic injection molding process, the mould of plastic melt in the the force pressure and mold clamping mould opening pressure, the pulling force, etc. , is one of the main plastic melt pressure. Under the effect of plastic melt pressure, the cavity would yield stress and deformation. If the bottom of the cavity wall and wall thickness is not enough, when the cavity is formed in the stress exceeds the allowable stress of the mould material, mould strength failure. At the same time, the low stiffness is large elastic deformation, resulting in a flash and influence, size and forming precision plastic parts may also lead to a difficult demoulding, etc.
when cooling contraction deformation is greater than the plastic parts, plastic parts will be around the cavity clinging to ejection, forced out is easy to scratch or damage to the plastic, so the cavity allows elastic deformation value should be less than the contraction of plastic parts. But, in general, plastic shrinkage is bigger. Design mould, its stiffness conditions should be to allow the minimum deformation value of design standards, but also shoulds not be groundless excessively raise standards, in order to avoid waste of material, increase the manufacturing difficulty.
more excellent articles: injection mold parting surface, click directly.
http://www。 csssld。 cn//html/2017/Info_0701/620。 HTML
nantong on suye's official website: http://www. csssld。 Cn / /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
molding parts of wall thickness calculation is a problem often encountered in the design of the mould, especially for large mold is more outstanding. Theoretical analysis and practice proved that mould is not to the requirement of strength and stiffness to both. For large size cavity, insufficient stiffness is the main problem, should press stiffness calculation conditions, for small size cavity, insufficient strength is the main problem, should according to the condition of strength calculation. Strength calculation condition is to meet all kinds of stress under the allowable stress.
the wall thickness of molding parts generally used calculation method and the look-up table method, but calculation method is tedious, the calculated result is close to and empirical data. According to the mold shape and size, a plastic mold usually need to 2 - guide pin number 4. Four commonly used size larger mould guide pillar, small mould usually use two guide pin. Guide pin diameter should be selected according to mold size, must make the pledge that we shall have sufficient strength and rigidity. The structure of guide pillar with plastic mould structure, size and production batch requirements vary, the structure of the commonly used have lead the guide pillar and shoulder guide pin.
when high pressure plastic melt injection mold cavity of some of the fitting surface will generate enough to flash gap. In order to make the cavity will not happen by die elastic deformation material overflow, at this time should be according to the maximum of different plastic material overflow clearance to determine its stiffness conditions. Low viscosity such as polyamide, polyethylene, polypropylene plastic, which allows clearance to 0. 025 - 0. 04mm； For the medium viscosity such as polystyrene, ABS plastic to 0. 05mm； The polysulfone, polycarbonate, the high viscosity of rigid polyvinyl chloride plastic is 0. 06 - 0. 08mm。
should guarantee the precision of plastic parts, plastic parts are all in size requirements, especially the high accuracy of small plastic pieces, which requires the mold cavity has the very good rigidity, i. e. plastic injection do not produce the large elastic deformation. Maximum elastic deformation parts 1/5 of the allowed tolerance, preferable in common small and medium-sized plastic parts of tolerance to 0. 13 - 0. 25 mm, thus allowing the elastic deformation of 0. 025 - 0. 5 mm, can press parts size and precision grade.
in the processing of plastic injection molding process, the mould of plastic melt in the the force pressure and mold clamping mould opening pressure, the pulling force, etc. , is one of the main plastic melt pressure. Under the effect of plastic melt pressure, the cavity would yield stress and deformation. If the bottom of the cavity wall and wall thickness is not enough, when the cavity is formed in the stress exceeds the allowable stress of the mould material, mould strength failure. At the same time, the low stiffness is large elastic deformation, resulting in a flash and influence, size and forming precision plastic parts may also lead to a difficult demoulding, etc.
when cooling contraction deformation is greater than the plastic parts, plastic parts will be around the cavity clinging to ejection, forced out is easy to scratch or damage to the plastic, so the cavity allows elastic deformation value should be less than the contraction of plastic parts. But, in general, plastic shrinkage is bigger. Design mould, its stiffness conditions should be to allow the minimum deformation value of design standards, but also shoulds not be groundless excessively raise standards, in order to avoid waste of material, increase the manufacturing difficulty.
more excellent articles: injection mold parting surface, click directly.
http://www。 csssld。 cn//html/2017/Info_0701/620。 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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