The concept of rubber mold: refers to the use of a specific shape of the cavity
The concept of rubber mold: refers to the use of a specific shape of the cavity, forming a certain shape and size precision rubber products tool through mold: 1. Punching die, drawing die, extrusion die, powder metallurgy die and other cavity mold: bending die, die casting die, forging die, plastic injection mold, rubber mold, mainly by the die, die casting die, injection mold and extrusion mold four kinds
Rubber mold manufacturer
2. The concept of pressing mold: it refers to the plastic material with certain plasticity, prefabricated into a simple shape and then filled into the mold cavity, after pressure, heat curing, you can obtain the desired shape products of a mold
3. The forming die structure types and main use open: suitable for simple shape, rubber hardness is low, and has a good liquidity of rubber rubber products enclosed: suitable for fabric, the products of other fabric and high hardness, illiquid products semi-closed: suitable for lower die with a mold cavity, high alignment requirements of products of single cavity mould, also in the fabric products suitable for the parts molded
4. Concept and type of parting surface: according to the geometric pattern and quality requirements of molded products, one or several parting surface and the separation surface of machined surface are determined on the structure of the mold, and become the common parting surface of parting surface: horizontal parting surface, vertical parting surface, step parting surface, oblique parting surface and compound parting surface
5. Selection principle of parting surface:
(1) ensure the smooth removal and demoulding of products, which is conducive to the discharge of gas in the fig2-16 cavity
(2) the parting face of the mold should avoid the working face of the product as far as possible
(3) selection of different parting surfaces of the same type of product
(4) the parting surface should choose the edge of the product and the surface of the arc protruding point, which is conducive to the trimming of the flying edge
(5) selection of parting surface of cloth and fabric
(6) selection of casing, dust cover and rubber bearing parting surface in rubber products
(7) to ensure the accuracy of products, to the coaxiality of high requirements of the product shape or hole, should be as far as possible in the same template, otherwise due to the lack of template matching accuracy, positioning deviation will affect the coaxiality of products.
6. Mold positioning: cylindrical surface positioning, cone surface and inclined surface positioning, parting surface positioning, guide column guide sleeve positioning, insert block and baffle positioning, haff positioning machine positioning, screw positioning
7. The concept of shrinkage rate of rubber, and the concept of causes and influencing factors: shrinkage of rubber refers to the percentage of the actual size of the product when the size of the product is taken out from the mold cavity and cooled to room temperature after the product is vulcanized.
(1) shrinkage caused by temperature change
(2) shrinkage caused by chemical reactions
(3) factors influencing the shrinkage caused by molecular chain orientation:
1. Gum rate and gum species 2. Hardness of glue 3. Curing temperature
4. Weight of semi-finished rubber
5, plastic processing technology
6. Shape and size of products
The concept of rubber mold: refers to the use of a specific shape of the cavity, forming a certain shape and size precision rubber products tool through mold: 1. Punching die, drawing die, extrusion die, powder metallurgy die and other cavity mold: bending die, die casting die, forging die, plastic injection mold, rubber mold, mainly by the die, die casting die, injection mold and extrusion mold four kinds
Rubber mold manufacturer
2. The concept of pressing mold: it refers to the plastic material with certain plasticity, prefabricated into a simple shape and then filled into the mold cavity, after pressure, heat curing, you can obtain the desired shape products of a mold
3. The forming die structure types and main use open: suitable for simple shape, rubber hardness is low, and has a good liquidity of rubber rubber products enclosed: suitable for fabric, the products of other fabric and high hardness, illiquid products semi-closed: suitable for lower die with a mold cavity, high alignment requirements of products of single cavity mould, also in the fabric products suitable for the parts molded
4. Concept and type of parting surface: according to the geometric pattern and quality requirements of molded products, one or several parting surface and the separation surface of machined surface are determined on the structure of the mold, and become the common parting surface of parting surface: horizontal parting surface, vertical parting surface, step parting surface, oblique parting surface and compound parting surface
5. Selection principle of parting surface:
(1) ensure the smooth removal and demoulding of products, which is conducive to the discharge of gas in the fig2-16 cavity
(2) the parting face of the mold should avoid the working face of the product as far as possible
(3) selection of different parting surfaces of the same type of product
(4) the parting surface should choose the edge of the product and the surface of the arc protruding point, which is conducive to the trimming of the flying edge
(5) selection of parting surface of cloth and fabric
(6) selection of casing, dust cover and rubber bearing parting surface in rubber products
(7) to ensure the accuracy of products, to the coaxiality of high requirements of the product shape or hole, should be as far as possible in the same template, otherwise due to the lack of template matching accuracy, positioning deviation will affect the coaxiality of products.
6. Mold positioning: cylindrical surface positioning, cone surface and inclined surface positioning, parting surface positioning, guide column guide sleeve positioning, insert block and baffle positioning, haff positioning machine positioning, screw positioning
7. The concept of shrinkage rate of rubber, and the concept of causes and influencing factors: shrinkage of rubber refers to the percentage of the actual size of the product when the size of the product is taken out from the mold cavity and cooled to room temperature after the product is vulcanized.
(1) shrinkage caused by temperature change
(2) shrinkage caused by chemical reactions
(3) factors influencing the shrinkage caused by molecular chain orientation:
1. Gum rate and gum species 2. Hardness of glue 3. Curing temperature
4. Weight of semi-finished rubber
5, plastic processing technology
6. Shape and size of products
