A typical mold structure shown in Figure 3.21. It is from the upper mold and lower mold of two parts. Upper and lower mold is closed so that the cavity installed in the feeding room and heated under pressure in the molding material, into a molten state filled the entire cavity. When the products after curing, the upper and lower mold open, the top of the device using the top of the products. Mold can be further divided into the following individual components.
Molded composite mold structure and classification of features
① cavity directly into the "products of the site. Icon on the mold cavity by the punch 3, 8 under the punch and die 4 composition.
② feed chamber 4 that the upper portion of the die.
③ guide mechanism arranged on the mold die by the surrounding four pillar 6 and 10 with guide sleeve composed of pillar holes.
④ side parting with side core pulling molded holes and undercut the products, the mold must have a side parting core pulling all kinds of organizations, products to emerge.
⑤ ejection from the top of the plate body 17, the top of the lever 11 and other integral parts.
⑥ thermosetting molding heating systems are generally required at higher temperatures, so the mold must be heated. Common heating methods are: electric heating, steam heating.
Second, mold Category
(A) classification based on connections with the press
① Mobile working outside the mold is mold. Not fixed in the press on the mold. In general, the mold parting, loading, closing and after molding products are removed from the mold in the machine outside. Mold itself, without heating device. This mold is not applicable to suppress the small and medium-volume products. Mobile mold simple structure, short cycle and low cost. But the charging, a model, pickup and other processes are manual, labor-intensive, low productivity.
② fixed die is machine loading and unloading of the mold. It is fixed to the press on, and with a heating device itself. The entire production process is sub-mode, loading, closing, molding and top out on the products in the press. Fixed Die long life, suitable for production volume, larger size products.
③ semi-permanent mold This mold somewhere between the between the two, usually fixed to the press on the upper die and lower die can move along the rail, with the positioning block positioning.
(B) the sub-surface feature classification
The role of sub-surface is a good product from the cavity has been formed to remove or to meet the installed molding inserts and exhaust needs.
① horizontal parting surface parallel to the press the work surface.
② vertical surface perpendicular to the parting press work surface.
③ complex parting parting surface parallel to the press the work of the existing table, but also perpendicular to the press the work surface.
(C) of the upper and lower sub-mode closed-form
Molded composite mold structure and classification of features
① open type mold shown in Figure 3.22 (a) shows characteristics of the mold is not feeding room. Such mold structure is simple, low cost, durable, easy mold release, easy to install inserts.
② closed mold shown in Figure 3.22 (2) below. The mold cavity feeding room for a continuation of the upper, non-extruded surface. All press the role of pressure on the products. Molding material overflow is very small. The density of products is good, high mechanical strength, and the flash in the vertical direction, easy to remove. This mold suitable for molding complex shape, thin, long processes, products, also apply to the small mobile unit pressure, density of the molded material. The disadvantages are: control of feeding quantity must be accurate; die punch and feeding chamber side wall friction, easy to damage the wall, when the top of the feed with the wall is damaged and easy to trace the product surface damage.
③ semi-closed mold shown in Figure 3.22 (3) below. The species feed on the mold cavity chamber, out of ring-type cavity, the density of products than the open type mold molding products is good, and easy direction to ensure a high degree of dimensional accuracy, to avoid scratches when stripping products.
Die in the process has an important role in suppressing the typical mold from the upper die and lower die two parts, upper and lower mold cavity is closed so that the molding installed on the heat under pressure into the molten material fills the cavity. When the products up and down mode after curing the top of the device used to open the top of the product pieces. Molds can be further divided into the following components: cavity, feeding rooms, guides, side parting heart pumping agencies, stripping agencies and heating systems.
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