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What is the concept of rubber mold?

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 manufactur
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 m
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 mo
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 su
5. Selection principle of parting su
(1) ensure the smooth removal and demoulding of products, which is conducive to the discharge of gas in the fig2-16
(2) the parting face of the mold should avoid the working face of the product as far as
(3) selection of different parting surfaces of the same type o
f 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 f
lying edge
(5) selection of parting surface of cloth
and fabric
(6) selection of casing, dust cover and rubber bearing parting surface in rub
ber 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, scr
ew 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 te
mperature change
(2) shrinkage caused by c
hemical reactions
(3) factors influencing the shrinkage caused by molecular
chain orientation:
1. Gum r
ate and gum species
2. Hardness of glue
3. Curing temperature
4. Weight o
f semi-finished rubber
5, plasti
c processing technology
6. Shape and size of products