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 .

Process

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

Mechanical Construction

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.

Hydraulics

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 .

Application:

  • Seals
  • O rings
  • Electrical Connector Inserts
  • Rubber – to – Metal
  • Rubber – to – Plastic
  • Gaskets

Download Technical Specification of Transfer Molding Press

TRANSFER MOLDING PRESS
TECHNICAL SPECIFICATIONS
MODEL MHPL MHPL MHPL MHPL MHPL MHPL MHPL MHPL MHPL MHPL
10 25 50 75 100 150 200 250 300 32-500A
MATERIAL TRANSFER UNIT Nominal pressure kn 210 210 210 210 210 210 210 210 210 2
Transfer cylinder copacity(Ton) Ton 5 12 20 25 30 40 60 60 100
Movement transfer cylinder Inch 8″ 8″ 10″ 12″ 12″ 14″ 14″ 14″ 16″
Movement transfer cylinder Down Strok Down Strok Down Strok Down Strok Down Strok Down Strok Down Strok Down Strok Down Strok
Boresize of cylinder mm 63 100 120 125 130 150 200 200 250
MOULD CLAMPING UNIT Clamping force Ton 10 25 50 75 100 150 200 250
Stroke llength mm 350 400 450 500 500 600 600 800 800
Platen bed size Inch 12″x12″ 14″x14″ 16″x16″ 18″x18″ 20″x20″ 22″x22″ 24″x24″ 28″x28″ 36″x36″
Cylinder bore size mm 100 125 200 220 225 300 350 400 450
Maxmum daylight mm 350 400 450 500 500 600 6+00 600 800
GENERAL Motor power H.P. 3 5 7.5 7.5 10 15 15 20 25 30
Movement clamping cylinder Upstroke Upstroke Upstroke Upstroke Upstroke Upstroke Upstroke Upstroke Upstroke 600
Opration PLC PLC PLC PLC PLC PLC PLC PLC PLC

Salient Feature

If you are talking about technology, then you will receive the best of the lot and nothing less than that. The same holds true for Transfer Molding Press as well, so you will receive the best technology, which include the below mentioned factor like:

  • Cavity molding is similar to that of compression molding
  • When the curing of rubber material is complete, the flash is being removed and it is also removed
  • For desired configurations and shape, rubber compound can cure into mold cavity when the pressure and heat is applied
  • RAM compression is being done during the transfer and the compounded rubber materials starts flowing
  • through the holes and straight to the mold cavity
  • The transfer mold that is present in here consists of RAM as well as transfer pot
  • The rubber material is placed prior to compression
  • Transfer holes are there in mold cavity that helps in connecting to the transfer pot through the holes

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