MPM 50 Bedienungsanleitung

Miniature Plastic Molding

Affordable Injection Molding Machinery

Model #50 – Hydraulic Molding Machine

OVERMOLDING MANUAL

6750 Arnold Miller Pk y.

Solon, Ohio 44139

440-498-8465

Model #50

Overmolding Manual

Version 1.00

Miniature Plastic Molding

OVERVIEW

This manual is a supplement to the provided Operating Manual included ith the Model 50

injection molding machine. The information in this manual is in addition to the information

provided in the other manuals.

The Model 50 machines have an optional base kno n as a 'C' frame. The optional base

takes the typical machine's 'V' mold base and rotates it 90º. The lo er frame of the machine is

also shaped so that it leaves the front of the machine open. Thus, operators can perform molding

operations on long cables ithout having to feed the cable through the center of the machine.

The option as intended to allo the end-user to repair damaged cable jackets. The purpose of

this manual is to explain in more detail ho to operate a Model 50 machine ith the 'C' frame

option.

GENERAL SAFETY INFORMATION

(1) ALWAYS WEAR SAFE Y GLASSES hen running this or other types of machinery or

equipment. Make sure that the glasses are constructed of ANSI (American National Standards

Institute) approved material.

(2) Please READ HE PROVIDED MANUALS in their complete entirety before beginning any

ork on the machine. Failure to revie the provided manuals may result in damage to the

equipment or injury to the operator.

(4) ALWAYS SHUT OFF THE POWER TO THE MACHINE when performing maintenance tasks.

An emergency stop button is provided on the operator’s panel that requires re-setting to operate

again. This button should not be used for shutting down the machine for maintenance. To shut

off power to the machine, use the rotary disconnect located on the main electrical enclosure. The

disconnect is also equipped with a lock-out feature for servicing the machine.

(5) NEVER REACH INTO THE MACHINE ithout taking safety precautions. There are potential

pinch points, high temperatures and voltages that ould present hazards to the operator if the

machine ere used in a careless manner.

(6) NEVER have more than one person operating the machine at any time.

(3) NEVER OPERATE THE MACHINE WHILE GUARDS ARE REMOVED OR RENDERED IN-

OPERATIVE. The Model 50 machine does not contain a moving clamping mechanism, but there

are moving parts, heater bands, and electrical devices that become potential safety hazards if the

guards are removed or the machine is operated in a careless manner.

(7) MAKE SURE THE MACHINE'S STAND IS SECURE BEFORE OPERATING. The machine

typically comes with a stand equipped with casters. Before operating the machine, make sure the

pads on the casters have been lowered. Failure to do so could cause the machine to move

around in an unsafe manner during operation. If the machine is positioned that permits access to

the rear of the unit, additional barrier guarding must be provided to prevent access.

(8) NEVER LEAVE HE MACHINE’S HEA ERS ON FOR ANY EX ENDED LENG H OF IME

WHEN HE MACHINE IS NO BEING OPERA ED. It may overheat the material in the scre

barrel, possibly degrading it to the point here it could explode, expelling dangerous gases.

INTRODUCTION

'V' Mold for Overmolding Cables

Miniature Plastic Molding offers a 'V' mold designed to overmold damaged jackets on

cables. The mold contains a large pocket to surround the damaged area. Either end of the mold

contains a groove large enough to hold the cable, but small enough to prevent material from

squirting out. The mold shown in the pictures below have interchangeable ends for different sized

cables.

INTRODUCTION

Optional 'C' Frame Base

An option available for the Model 50's is a 'C' frame base.

The optional base is similar to the standard base, except it is

rotated 90º. The frame has also been modified so that the front of

the machine is left open. Thus, a long cable can enter the

machine from the front. The 'V' mold is then loaded from the side.

Operators can then repair damaged cable jackets faster and

easier, versus using a clamping mechanism that ould require the

operator to feed the cable through.

Overhead View of Base

( op Assembly Removed)

Cable

'V' Mold

Overhead View of Base

( op Assembly Removed)

'V' Mold

1Load cable into machine by entering

through the front. A gap exists bet een the

base of the machine and the bottom of the

nozzle. Load the cable bet een this gap.

2Move the cable through the center of the

machine and load the mold through the

side of the machine.

Example of Loading a Mold into the Machine

Overhead View of Base

( op Assembly Removed)

3Center the mold ithin the base of the

machine so that the nozzle aligns ith the

opening of the mold.

Equipment Setup

Set Barrel emperatures

The Model 50 machine has two pyrometers to control the

temperature of the barrel and nozzle. Set the temperatures to the

recommendation of the material's manufacturer. With cable overmolding

it may be required to increase the temperature to the upper range of the

material. The more the material flows, the better it will wrap around the

cable. If the material is too cold, it may push the cable to the bottom of

the pocket and not fully protect the cable.

DO NO leave the material in the barrel for any extended period of time

with the heaters running. After a short period of time the material might

start to degrade and begin to build gases in the barrel. If left unattended

the pressure could build to dangerous levels. Take precautions when

purging material that has sat for a period of time at temperature. The

release of material could be very violent.

It is recommend to purge the barrel of material and remove heat if the

machine will not be in use. Even after a few minutes the material may be

too warm to mold with and will need to be purged.

Set Pressure

When overmolding cable it may be required to lower

the injection pressure. If too much force is used to push the

material into the mold, it may also push the cable to the

bottom of the pocket. MPM sets the maximum pressure for

the hydraulic system to about 2200 PSI. This maximum is set

by the main relief valve.

DO NOT adjust the main relief valve to adjust operating

pressure.

Use the pressure relief valve, located under the

inject/retract valve, to adjust the injection pressure. A pressure

gauge is mounted on the retract port of the valve. Use this

gauge to monitor system pressure when the plunger is fully

retracted. To adjust the injection pressure have an operator

manually retract the plunger and hold it. Another operator can

adjust the pressure relief valve while monitoring the pressure

gauge. Set the pressure to a desired level. Ideally, the best

level is one where the plunger has enough power to move the

material into the mold without dislodging the cable.

NOTE: Running at higher temperatures will allow the material

to flow easier. Thus, less pressure will be required to inject

material into the mold. Take care not to exceed recommended

temperatures for the material. Pressure Relief Valve

Main Relief Valve

Inject Solenoid

Retract Solenoid

Pressure Gauge

Machine Operation

Listed belo are recommended steps for cycling the machine. Use these steps as a

guideline for operating the machine. Most of the steps sho n are also the same steps used in

standard molding applications.

(1) The first step is to prepare the shot by filling the barrel with material. When filling the barrel,

do not use a mold or purge plate in the 'V' clamp. The nozzle uses a non-drool style tip, which

means the tip is shut off when not pressed against a mold. To fill the barrel requires cycling the

plunger up and down several times. The non-drool tip will prevent any material from escaping

through the nozzle. Additional material is pulled from the hopper by the hopper piston. The

hopper piston will push more material into the barrel every time the plunge pushes down.

Several cycles of the plunger might be required based on the volume of the shot required.

Overmolding of cables usually require a larger shot size to fill the whole chamber in the mold.

Gauge the amount of material in the barrel based on the stroke distance of the plunger. As

material builds up, the plunger will not stroke down as far. It is better to have more material in

the barrel than needed. The extra material will help with the packing process, which removes

any voids in the molded part.

NOTE: Monitor the gap on the kick-out plate tie

rod hen the plunger is fully do n. The smaller

the gap, the more material is in the barrel.

(2) When enough material is in the barrel, insert the mold with the cable into the machine.

Position the opening to the mold directly underneath the nozzle tip.

OPTIONAL: Turn the timer switch to the on position to allow automatic operation. Run a few

cycles in manual to determine how long to set the timer. When the timer reaches the set time,

the nozzle will retract automatically.

Machine Operation

(3) Manually run the plunger down to push material into the mold. The Inject/Start Cycle

position is a maintained position, so the operator does not need to hold the switch to keep the

plunger from stopping. To run the machine in manual operation, the timer switch is in the off

position.

(4) Continue injecting until no movement can be seen on the plunger. The speed at which the

plunger moves down will be based on the temperature of the material and the injection

pressure. Expect this portion of the cycle to take over one minute before the plunger finishes

moving; this is good as the cable is not likely to be displaced.

(5) Once the plunger has stopped moving, continue to run the plunger down to finish the pack

on the molded part. Packing will try to fill any remaining voids. If the plunger has not moved in

a 3-5 second span, then the packing phase is complete. Running the plunger for a longer

period of time will not hurt the plunger. It will draw heat out of the nozzle and into the mold. The

mold may become hot to the touch. The use of gloves is recommended. Drawing heat out of

the nozzle may require more time between cycles for the heaters to recover.

(6) Once the pack is complete, manually retract the nozzle off of the mold. Make sure to run the

plunger all the way up. As the plunger retracts, the kick-out plate underneath the mold will raise

the mold out of the 'V' clamp. Remove the move and cable from the machine.

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