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Key points of structural design for plastic products
December 04, 2023
1. Adhesive thickness (adhesive position):
The adhesive thickness (overall shell) of plastic products is usually around 0.60-3.00. If it is too thick, it is easy to shrink and produce bubbles, and if it is too thin, it is difficult to fill the adhesive. For large products, the adhesive thickness should be thicker, and for small products, it should be thinner. Generally, products with a thickness of 1.0-2.0 are preferred. Moreover, the adhesive position should be as uniform as possible. In case of necessity, local areas can be appropriately thicker or thinner, but it should be gradual and not abrupt. The principle should be to not shrink and be able to fill the adhesive. Generally, it is difficult to fill the plastic adhesive when the thickness is less than 0.3, but soft rubber and rubber can also fill the adhesive when the thickness is 0.2-0.3.
2. Strengthening tendon (bone position):
Most plastic products have reinforcing ribs, which can greatly increase their overall strength without increasing the overall adhesive thickness of the product. They are particularly useful for large and stressed products, while also preventing product deformation. The thickness of reinforcing ribs is usually taken as 0.5-0.7 times the overall adhesive thickness, and if it is greater than 0.7 times, it is prone to shrinkage. When the height of the reinforcing ribs is large, a slope of 0.5-1 should be made (due to its high mold resistance), or a drop of 0.25 on one side should be made. When the height is low, it is not necessary to make a slope.
3. Demoulding slope:
Plastic products must have a demolding angle, except for those with shallow height (such as a flat plate) and those with special requirements (but when the side wall is large and there is no demolding angle, a row position needs to be made). The angle of demolding is usually 0.5-8 degrees, usually around 3 degrees, depending on the size, height, and shape of the product, with the principle of smooth demolding and no impact on usage function. The slope of the front mold of the product is usually 0.5 degrees greater than the slope of the back mold, so that the product can be left in the back mold during mold opening. Usually, a slope needs to be made in areas such as pillow position, insertion, and collision, and the difference between the upper and lower dimensions (i.e. the difference between the large and small end dimensions) should be greater than 0.1 on one side. If the appearance is sprayed with oil, it needs to be done at least 3 degrees. If it is made of material or sun lines, it needs to be done at 5-8 degrees.
4. Rounded corner (R corner):
Plastic products, except for areas with sharp edges specified by special requirements, usually require rounded corners at the edges to reduce stress concentration, facilitate plastic flow, and facilitate demolding. The minimum R on the appearance surface is usually greater than 0.15, usually ranging from 0.2 to 0.3.
5. Hole:
From the perspective of facilitating mold processing, it is best to make holes into circular holes with simple and regular shapes, and avoid making complex irregular holes as much as possible. The aperture should not be too small. Generally, if the wall thickness is 2.0, the opening should be above 0.6, and the ratio of hole depth to aperture should not be too large. Mold cores that are thin and long are prone to breakage and deformation. The distance between the hole and the outer edge of the product should be greater than 1.5 times the aperture, and the distance between holes should be greater than 2 times the aperture, so that the product has the necessary strength.
Holes parallel to the direction of the mold opening are usually formed by using the mold center (insertable, extendable) or by piercing or inserting into the mold. Holes that are not parallel to the direction of the mold opening are usually arranged in rows or diagonally inserted. On the premise of not affecting product use and assembly, the holes on the side walls of the product should also be made into holes that can be penetrated or inserted into the mold as much as possible.
Dongguan Anding Technology Manufacturing Co., Ltd. is a modern private enterprise integrating product development and design, precision mold manufacturing, product injection molding, oil injection screen printing, and electronic assembly. It is located in Chuangye Road, Dongshan Village, Qishi Town, Dongguan City, with convenient transportation. Our company adheres to the corporate tenet of "emphasis on quality, integrity, and responsibility", with the business philosophy of "customer first, technology, efficiency, and service". Under the guidance of the "Four Fines" business policy, the company has reached the forefront of the industry in the entire precision parts processing industry.Injection mold processing - TV Plastic shell mold, Electronic product mold,Electronic digital product mold,Mobile phone peripheral product mold,Toy product molds, Household.
The adhesive thickness (overall shell) of plastic products is usually around 0.60-3.00. If it is too thick, it is easy to shrink and produce bubbles, and if it is too thin, it is difficult to fill the adhesive. For large products, the adhesive thickness should be thicker, and for small products, it should be thinner. Generally, products with a thickness of 1.0-2.0 are preferred. Moreover, the adhesive position should be as uniform as possible. In case of necessity, local areas can be appropriately thicker or thinner, but it should be gradual and not abrupt. The principle should be to not shrink and be able to fill the adhesive. Generally, it is difficult to fill the plastic adhesive when the thickness is less than 0.3, but soft rubber and rubber can also fill the adhesive when the thickness is 0.2-0.3.
2. Strengthening tendon (bone position):
Most plastic products have reinforcing ribs, which can greatly increase their overall strength without increasing the overall adhesive thickness of the product. They are particularly useful for large and stressed products, while also preventing product deformation. The thickness of reinforcing ribs is usually taken as 0.5-0.7 times the overall adhesive thickness, and if it is greater than 0.7 times, it is prone to shrinkage. When the height of the reinforcing ribs is large, a slope of 0.5-1 should be made (due to its high mold resistance), or a drop of 0.25 on one side should be made. When the height is low, it is not necessary to make a slope.
3. Demoulding slope:
Plastic products must have a demolding angle, except for those with shallow height (such as a flat plate) and those with special requirements (but when the side wall is large and there is no demolding angle, a row position needs to be made). The angle of demolding is usually 0.5-8 degrees, usually around 3 degrees, depending on the size, height, and shape of the product, with the principle of smooth demolding and no impact on usage function. The slope of the front mold of the product is usually 0.5 degrees greater than the slope of the back mold, so that the product can be left in the back mold during mold opening. Usually, a slope needs to be made in areas such as pillow position, insertion, and collision, and the difference between the upper and lower dimensions (i.e. the difference between the large and small end dimensions) should be greater than 0.1 on one side. If the appearance is sprayed with oil, it needs to be done at least 3 degrees. If it is made of material or sun lines, it needs to be done at 5-8 degrees.
4. Rounded corner (R corner):
Plastic products, except for areas with sharp edges specified by special requirements, usually require rounded corners at the edges to reduce stress concentration, facilitate plastic flow, and facilitate demolding. The minimum R on the appearance surface is usually greater than 0.15, usually ranging from 0.2 to 0.3.
5. Hole:
From the perspective of facilitating mold processing, it is best to make holes into circular holes with simple and regular shapes, and avoid making complex irregular holes as much as possible. The aperture should not be too small. Generally, if the wall thickness is 2.0, the opening should be above 0.6, and the ratio of hole depth to aperture should not be too large. Mold cores that are thin and long are prone to breakage and deformation. The distance between the hole and the outer edge of the product should be greater than 1.5 times the aperture, and the distance between holes should be greater than 2 times the aperture, so that the product has the necessary strength.
Holes parallel to the direction of the mold opening are usually formed by using the mold center (insertable, extendable) or by piercing or inserting into the mold. Holes that are not parallel to the direction of the mold opening are usually arranged in rows or diagonally inserted. On the premise of not affecting product use and assembly, the holes on the side walls of the product should also be made into holes that can be penetrated or inserted into the mold as much as possible.
Dongguan Anding Technology Manufacturing Co., Ltd. is a modern private enterprise integrating product development and design, precision mold manufacturing, product injection molding, oil injection screen printing, and electronic assembly. It is located in Chuangye Road, Dongshan Village, Qishi Town, Dongguan City, with convenient transportation. Our company adheres to the corporate tenet of "emphasis on quality, integrity, and responsibility", with the business philosophy of "customer first, technology, efficiency, and service". Under the guidance of the "Four Fines" business policy, the company has reached the forefront of the industry in the entire precision parts processing industry.Injection mold processing - TV Plastic shell mold, Electronic product mold,Electronic digital product mold,Mobile phone peripheral product mold,Toy product molds, Household.
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Nous contacter
Produits populaires
Actualités
Nouvelles de l'industrie
Contrôle de processus de l'usinage de précision des moules
November 24, 2023
Blog News
How to improve the shrinkage problem of plastic molds
January 12, 2024
What factors will affect the production process of plastic molds
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Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.