GENERAL OVERVIEW :-
This is a manual operation that combines compression-, molding, and transfer-molding processes. This combination has the good surface finish, dimensional stability, and mechanical properties obtained in compression molding and the high-automation capability and low cost of injection molding and transfer molding. Transfer Molding is having a “piston and cylinder”-like device built into the mold so that the rubber is squirted into the cavity through small holes. A piece of uncured rubber is placed into a portion of the transfer mold called the “pot.” The mold is closed and under hydraulic pressure the rubber or plastic is forced through a small hole (the “gate”) into the cavity. The mold is held closed while the plastic or rubber cures. The plunger is raised up and the “transfer pad” material may be removed and thrown away. The transfer mold is opened and the part can be removed. The flash and the gate may need to be trimmed. Another key point is that a premeasured amount of thermosetting plastic in powder, preform, and even granular form can be placed into the heating chamber. The molds in both compression and transfer molding remain closed until the curing reaction within the material is complete. Ejector pins are usually incorporated into the design of the molding tool and are used to push the part from the mold once it has hardened. These types of molding are ideal for high production runs as they have short production cycles. Transfer molding, unlike compression molding uses a closed mold, so smaller tolerances and more intricate parts can be achieved. The fixed cost of the tooling in transfer molding is greater than in compression molding and as both methods produce waste material, whether it be flash or the material remaining in the sprue and runners, transfer molding is the more expensive process.
We also have with us rich industry experience to successfully handle the requirements of fully automatic Rubber Transfer Molding Hydraulic Presses. Made available with option of PLC Control with Touch Screen, these are offered in up to 500 Tons .
These presses are based on the technology that includes :
- Mold cavity similar to compression mold
- In addition, transfer mold also contains transfer pot and Ram
- Here, rubber material is placed before compression
- Mold cavity contains transfer holes that connect to transfer pot through Holes
- During transfer, ram is compressed and compounded rubber material flows through holes into mold cavity
- Here, under heat and pressure, rubber compound cures into mold cavity as per desired shape and configurations
- After rubber material is cured, it is removed and flash is removed
In order to mate the latest demand of customers with various layout demand of customers with layout specifications, MICRO design team equipped with latest software SOLIDE WORK through which any elastricity by strain-gauges ensuring that the critical points of the structure are stressed kept with in limit after adopting new technology MHPL team capable to design and produce presses which are extremely rigid in structure .The specific concept of open and compact makes MHPL presses highly flexible for inline use. The main slide is completely guided by prismatic jibs or by linear sliding block with adjustable backlash for high working precision 16sliding blocks incorporating adjustable backlash can also be incorporating for more precision in main bed.
Micro Team is having a vast exposure in designing of any kind of complicated circuit . MHPL team has the capability of designing the hydraulic circuits with various control valves and pumps such as proportional and servo valves . The manifolds are designed in latest software .