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Presses

SMC & BMC Press

  • Glass-reinforced thermoset sheetSMC comes as sheet and BMC as bulk; both take shape by curing under heat and pressure.
  • Cycle speed is decisiveOnce the material is inside the mould it can start to crystallise; if the press does not close quickly the part is spoiled before it fills.
  • A standard frame suited to asymmetric loadsMost products are not symmetrical; the standard design covers most of them without a special construction.
  • Ram parallelism systemFour counter-holding points bring the ram down parallel; corner-to-corner thickness variation and material waste fall.

What is a SMC & BMC Press?

The SMC & BMC press shapes glass-fibre reinforced thermoset compounds by curing them under pressure in a heated mould. Tractor bonnets and covers, the complete front panel of a bus and large outdoor electrical cabinets are this press's work.

What is decisive is cycle speed: the material can crystallise once it is inside the mould, and if the press does not close quickly the part is spoiled. On large, asymmetric parts a ram that descends parallel to the platen reduces thickness variation and therefore material consumption. A cured thermoset cannot be remelted; melamine products are not this press's job.

Is this press right for you?

Suitable

  • Moulding of glass-fibre reinforced thermoset SMC sheet and BMC bulk
  • Large-area, non-symmetrical panels and covers
  • Large outdoor electrical enclosures

Automotive — parts typically produced in this sector

These images are representative — they show the shape of the part; they are not the exact parts we produce. If you find one that resembles your own part, send us its drawing and we will tell you which press it is made on. Send your part drawing

  • Tractor bonnet and covers — representative imagerepresentative
    Tractor bonnet and covers
  • Bus front panel — representative imagerepresentative
    Bus front panel
  • Composite body panel — representative imagerepresentative
    Composite body panel
  • Headlamp and lamp housing — representative imagerepresentative
    Headlamp and lamp housing
  • Ribbed composite structural panel — representative imagerepresentative
    Ribbed composite structural panel

Defence Industry — parts typically produced in this sector

  • Composite housing box and lid — representative imagerepresentative
    Composite housing box and lid
  • Ribbed composite structural panel — representative image (view from the opposite side)representative
    Ribbed composite structural panel

Electrical & Energy — parts typically produced in this sector

  • Outdoor electrical enclosure — representative imagerepresentative
    Outdoor electrical enclosure
  • Switchgear enclosure and insulator — representative imagerepresentative
    Switchgear enclosure and insulator
  • Meter box — representative imagerepresentative
    Meter box
  • Composite housing box and lid — representative image (view from the opposite side)representative
    Composite housing box and lid

This press at work

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  • Özkoç - Hydraulic Composite Press

For those who want the detail

How it works: curing, cycle speed and ram parallelism

SMC is a glass-fibre reinforced thermoset sheet; BMC is the same chemistry in bulk form. Both are placed in a heated mould, the press closes, and the material flows and cures under pressure. A cured thermoset does not go back — so the cycle leaves no room for melting down and trying again; it is a get-it-right-first-time job.

Cycle speed is therefore not a comfort but a quality requirement. The material can begin to crystallise the moment it enters the mould; if the press does not close fast enough the part is spoiled before it has even filled. ÖZKOÇ designs this press to close fast.

The second issue is asymmetry. Most parts produced on this press are not symmetrical in geometry: a tractor bonnet, a bus front panel, a large electrical cabinet. An asymmetric part produces an asymmetric load in the mould; if the ram tilts to one side, a thickness difference appears between one corner of the part and the other. Extreme asymmetry calls for a special construction, but ÖZKOÇ's own standard design has proved suitable for many asymmetric applications without any special solution.

On large parts the ram parallelism system designed by ÖZKOÇ comes into play: roughly four counter-holding systems keep the ram descending parallel to the lower platen. For the buyer this translates into the following:

  • Corner-to-corner thickness variation across the part is reduced to a minimum
  • Material is saved; no extra wall thickness is added as a safety margin
  • Because the material is homogeneous, the strength comes out as intended
  • No extra heat or material is spent

Rigid frame joined with prepared weld bevels

Across ÖZKOÇ — not a feature unique to this press

When the form or the embossing does not come out, the toolmaker is blamed straight away. More often than not the die is not the cause: the press frame deflects under load and the two halves of the die no longer seat fully on each other. The share the frame has in this is usually unknown on the buyer's side, because it is written in no catalogue.

When ÖZKOÇ builds the frame as a welded construction, it joins the crossbeams and the plates BY PREPARING A WELD BEVEL. There are many companies in the sector that join without preparing a bevel; the weld then stays on the surface only. Once the bevel is prepared, the weld penetrates the cross-section and the frame resists deflection under load.

This holds for every frame type, monoblock or column-type — it is not an option that depends on the type of press, it is ÖZKOÇ's manufacturing discipline.

  • Crossbeams and support plates are joined with a prepared weld bevel.
  • The weld does not stay on the surface, it penetrates the cross-section; the frame does not deflect under load.
  • The same discipline is applied whether the frame is monoblock or column-type.

Ram parallelism system

Across ÖZKOÇ — not a feature unique to this press

On wide and asymmetric parts the load bears on one corner of the ram; the ram comes down slightly tilted and one corner of the part turns out thicker than the other. The result: excess material, uneven strength, unnecessary heat and cycle time.

In the ram parallelism system designed by ÖZKOÇ itself, four counter-pressure cylinders bring the ram down parallel to the lower plate. The difference in thickness between the corners drops to a minimum; material is saved, and the homogeneity of the part keeps the strength where it is wanted.

The same arrangement works in cutting as well: at the instant the shear occurs, the counter-pressure cylinders absorb the shock, maintain parallelism and extend the life of the cutting die.

  • Four counter-pressure cylinders bring the ram down parallel to the lower plate.
  • On a wide and asymmetric part the difference in thickness between the corners drops to a minimum.
  • Material savings + homogeneous strength.
  • In cutting it absorbs the shock and extends die life.

This press is used in these sectors too