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Vacuum injection molding processing parts design
by：CSSSLD
2021-02-03
Vacuum forming smoke vent design is the key of mould design.
Smoke hole position should be the last place in the sheet film, such as around the bottom of the concave die and have sunken place, punch forming around at the bottom of the punch, etc. , specific situation depends on the shape and size of the injection molding processing.
For small plastic pieces, smoke hole spacing in 20 -
Choose between 30 mm, and for large plastic parts should be appropriate to increase the pumping hole spacing.
using vacuum forming parts shape should not have too many bumps and deep grooves, or it would be difficult to molding plastic parts is too thin and the intensity of influence there. Plastic in the high elastic state to vacuum forming, molding pressure is small, so the shrinkage rate is bigger, so it is difficult to get high dimensional accuracy. Plastic pieces of the ratio of the depth and width is called extension ratio and extension ratio to a large extent reflects the ease of plastic molding, which extended the greater than, the more difficult.
the factors affected the accuracy of parts size is more, in addition to the cavity size precision, molding method, and mold temperature, mold temperature and a variety of plastic raw materials and so on, so it is difficult to more accurately determine the shrinkage rate in advance. If the production batch, dimension accuracy and higher, it's best to start with plaster models do vacuum forming process test, measure the shrinkage rate, and used as the basis for calculation of mold cavity.
extended too much than the minimum wall thickness bum is very thin, it is elected thicker plastic sheet molding, otherwise there will be a local alligator. Extension ratio also and a variety of plastic sheet, forming method has a great influence on the extended than also. Generally USES the extension ratio of 0. 5 - 1, the largest and should not be more than 1. 5. Due to the plastic pieces in the corner is likely to happen wall thinning and stress concentration phenomenon, so should be rounded transition, and arc radius should be as large as possible, but the minimum radius should not less than the thickness of the sheet.
vacuum molding plastic parts and other plastic forming parts also need to draft, but the vacuum forming draft should be slightly larger, typically 1 & deg; - 4° , big slope demould easily not only, but also make the status of the uneven thickness of improved. In order to put the plastic sheet holding to the mold, sheet should leave allowance in all directions. Design of vacuum forming mould to consider the question is, reasonable choice of vacuum forming method and the device, according to determine the shape and size of the mold and plastic molding performance and production batch to choose the appropriate materials.
to use ordinary vacuum molding difficult and requires relatively even wall thickness of deep cavity injection molding processing, can be used in a vacuum molding. Stretch vacuum molding refers to the sheet after heating in the molding process makes its first, and then forming. Extension methods have punch stretching method, plunger and compressed air extension method. Vacuum forming for geometry and dimensional accuracy, extension ratio has a specific process requirements.
the mould structure design including the position of the disadvantage of cavity size, porosity and size, surface roughness, edge sealing structure of mould and heating, cooling, etc. The vacuum forming mold size want to consider the shrinkage rate of plastic, the calculation method and the injection mold cavity calculation method for the same. Vacuum forming plastic shrinkage, about 50% is removed from the mold of the plastic parts, 25% is within 1 h at room temperature after demoulding, the rest 8-25% is in the future Within 24 h. In addition, with die molding plastic wall with convex mold and molding plastics shrinkage 25% larger 50%.
more excellent articles: blow molding part design, just click.
http://www。 csssld。 cn//html/2017/Info_0612/602。 HTML
nantong on suye's official website: http://www. csssld。 Cn / /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
using vacuum forming parts shape should not have too many bumps and deep grooves, or it would be difficult to molding plastic parts is too thin and the intensity of influence there. Plastic in the high elastic state to vacuum forming, molding pressure is small, so the shrinkage rate is bigger, so it is difficult to get high dimensional accuracy. Plastic pieces of the ratio of the depth and width is called extension ratio and extension ratio to a large extent reflects the ease of plastic molding, which extended the greater than, the more difficult.
the factors affected the accuracy of parts size is more, in addition to the cavity size precision, molding method, and mold temperature, mold temperature and a variety of plastic raw materials and so on, so it is difficult to more accurately determine the shrinkage rate in advance. If the production batch, dimension accuracy and higher, it's best to start with plaster models do vacuum forming process test, measure the shrinkage rate, and used as the basis for calculation of mold cavity.
extended too much than the minimum wall thickness bum is very thin, it is elected thicker plastic sheet molding, otherwise there will be a local alligator. Extension ratio also and a variety of plastic sheet, forming method has a great influence on the extended than also. Generally USES the extension ratio of 0. 5 - 1, the largest and should not be more than 1. 5. Due to the plastic pieces in the corner is likely to happen wall thinning and stress concentration phenomenon, so should be rounded transition, and arc radius should be as large as possible, but the minimum radius should not less than the thickness of the sheet.
vacuum molding plastic parts and other plastic forming parts also need to draft, but the vacuum forming draft should be slightly larger, typically 1 & deg; - 4° , big slope demould easily not only, but also make the status of the uneven thickness of improved. In order to put the plastic sheet holding to the mold, sheet should leave allowance in all directions. Design of vacuum forming mould to consider the question is, reasonable choice of vacuum forming method and the device, according to determine the shape and size of the mold and plastic molding performance and production batch to choose the appropriate materials.
to use ordinary vacuum molding difficult and requires relatively even wall thickness of deep cavity injection molding processing, can be used in a vacuum molding. Stretch vacuum molding refers to the sheet after heating in the molding process makes its first, and then forming. Extension methods have punch stretching method, plunger and compressed air extension method. Vacuum forming for geometry and dimensional accuracy, extension ratio has a specific process requirements.
the mould structure design including the position of the disadvantage of cavity size, porosity and size, surface roughness, edge sealing structure of mould and heating, cooling, etc. The vacuum forming mold size want to consider the shrinkage rate of plastic, the calculation method and the injection mold cavity calculation method for the same. Vacuum forming plastic shrinkage, about 50% is removed from the mold of the plastic parts, 25% is within 1 h at room temperature after demoulding, the rest 8-25% is in the future Within 24 h. In addition, with die molding plastic wall with convex mold and molding plastics shrinkage 25% larger 50%.
more excellent articles: blow molding part design, just click.
http://www。 csssld。 cn//html/2017/Info_0612/602。 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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