Frequently Asked Questions
About Plate Accelerators

A plate accelerator is a compact mechanical component used to make one ejector-related plate move faster or through greater travel than another plate during the ejection sequence. It converts the movement of the driving plate into accelerated movement of the secondary plate. We select the device from the mould layout, plate sequence, required stroke, load, available space and return arrangement.

A plate accelerator is used when the mould design requires an upper, secondary or stripper-related plate to advance more quickly than the plate that drives it. This can create the extra relative movement needed to release a component, separate a feature or complete ejection within limited machine stroke. The device must be designed into the full sequence rather than added as an isolated part.

Both create sequenced ejection. A two-stage ejector usually holds two plate assemblies together for a defined stroke and then releases one while the other continues. A plate accelerator often operates by amplifying movement: when the base plate moves one unit, the mechanism pushes the secondary plate two units (or another set ratio) in the same time. We evaluate the required sequence before selecting either mechanism.

A mould latch holds and releases plates across the mould parting lines to control opening. A plate accelerator is usually installed within the ejector housing to change the speed and stroke relationship of the ejector plates themselves. The two devices control different parts of the mould movement and cannot substitute for each other.

Plate accelerators typically use mechanical linkage, pivot, cam, rack-and-pinion or toggle arrangements to multiply input movement into greater output movement. The exact mechanism determines the acceleration ratio, load capacity, installation size and sensitivity to wear. The official page does not describe the specific mechanism, so the product drawing and operating limits must be verified.

Common ratios are often fixed by the geometry of the device (such as 1:2 or 1:1.5), meaning the accelerated plate travels twice or 1.5 times as far as the driving plate. The required ratio depends on the component geometry, clearance and total available machine stroke. We need the assembly drawing to confirm that the chosen ratio will produce the correct travel.

They can be considered, but accelerators require specific installation volume, plate thickness and stroke clearance within the ejector housing. If the housing is too shallow or crowded with pins and cooling, the device may not fit or operate safely. We verify the required pocket dimensions, plate thickness and travel before confirming the product.

No. A single accelerator pushing an entire plate would twist the plate, bind the guide pins, damage the device and cause uneven ejection. They must be installed in balanced, symmetrical sets (typically two, four or more) to distribute load and keep the accelerated plate parallel during its fast movement.

Mechanical amplification trades force for distance. If a device doubles the travel (1:2 ratio), the available force delivered to the accelerated plate is halved (excluding friction losses). Therefore, the machine ejection force must be more than double the required component-release load to ensure the accelerator does not stall or break.

The official product page lists plate accelerators without displaying dimensions or a model table. Because the mechanism must fit inside a machined pocket and coordinate with the plate stroke, buyers must request a verified product drawing and installation guide before ordering or machining the mould base.

The accelerated stroke must be long enough to release the component or feature, clear the required interference and allow the part to fall safely. It is calculated by multiplying the driving plate’s stroke by the device ratio. Both the base stroke and the accelerated stroke must remain within the device’s rated limits.

If the driving plate travels too far, the accelerator mechanism reaches its physical limit. The device can break, lock up or crush the internal components. The mould design must incorporate positive stops or precise machine settings to prevent the ejector assembly from over-stroking the device.

High machine ejection speed creates severe shock loads when the accelerator engages and when it reaches the end of stroke. Because the secondary plate is moving faster than the base plate, kinetic energy and impact forces increase significantly. Accelerators perform best when ejection speed is controlled and sudden impact is avoided.

They are designed for specific load capacities, but because they amplify movement, they reduce available push force. They should not be used where part shrinkage, deep cores or undercuts create massive resistance. If the ejection load is too high, the components inside the accelerator will wear rapidly or fracture.

They must be arranged symmetrically around the centre of resistance to balance the load and maintain plate parallelism. Spacing depends on plate stiffness and total required force. Unbalanced mounting or poor spacing will cause the accelerated plate to twist, bend ejector pins and damage the accelerator mechanisms.

Yes. The mechanism must reverse its operation when the ejector assembly returns. The accelerated plate must push back smoothly through the device to return the driving plate. The entire assembly must be free from binding, and mould return pins or springs must be sized to overcome the combined resistance of the system.

An accelerator may be connected to move a stripper plate or secondary ejector plate, provided the installation space, load direction and return mechanism are designed correctly. Stripper plates can require significant release force, so the load capacity of the accelerator set must be evaluated carefully against the actual stripping friction.

The mould designer should calculate the total ejection force required for the accelerated section, multiply it by a safety factor, and compare it against the total rated capacity of the selected accelerator set. We need the expected load, stroke, speed, plate weight and part resistance to confirm the correct device.

They can be, provided the device size and quantity are scaled to the heavy plate mass and ejection load. Moving a heavy plate very quickly generates high momentum and requires a robust mechanism. A larger series of accelerator and more mounting points may be needed for stability.

Plate accelerators are precision assemblies. Internal sliding, pivoting or rack components are typically manufactured from hardened tool steels or high-tensile alloys to resist wear and compressive deformation. The housing and mounting blocks may use structural steels. The exact materials depend on the selected series and load rating.

The device transfers ejection force through small internal contact areas while moving at high speed. If the components are soft, they will gall, indent or wear rapidly, altering the stroke ratio and creating play. Hardened components ensure the mechanism operates smoothly and maintains positional accuracy over thousands of cycles.

Yes. Plate accelerators are generally offered in different sizes to accommodate different plate thicknesses and load requirements, and they may offer different stroke-amplification ratios (e.g. 1:1.5 or 1:2). Buyers must select the specific size, stroke limit and ratio from the verified product drawing.

Elevated mould temperatures can cause thermal expansion, reducing internal clearances and altering the fit of the device in the mounting pocket. High temperatures may also degrade standard lubricants, leading to galling. Provide the expected operating temperature so compatibility and clearance can be reviewed before supply.

Yes. Mechanical accelerators involve sliding or pivoting contact under load. They require regular application of appropriate high-pressure grease to minimise friction, prevent wear and dissipate heat. Operating the device dry will cause rapid wear, sticking and failure. Follow the recommended lubrication interval and type.

Like any precision mechanism, they perform best when kept clean. Contamination from dust, rust, coolant or abrasive polymer off-gassing can mix with the lubricant and wear the internal components. The device should be installed in a clean area of the ejector housing and inspected periodically.

Verify the overall dimensions, mounting-hole positions, stroke ratio, movement smoothness and alignment against the required product drawing. For matched sets, confirm that all devices operate identically and have the same stroke limits. Buyers can request dimensional inspection reports when placing the order.

Provide the mould plate layout, required base stroke, required accelerated stroke, estimated ejection force, plate dimensions, mass, operating temperature, available installation space, desired quantity per mould and delivery location. A complete assembly drawing is required to evaluate the mounting and sequencing.

The pocket must provide a flat, rigid backing and locate the device accurately using defined datums or dowel pins. It must also provide adequate clearance for the moving components throughout the entire stroke. If the pocket is distorted, misaligned or too small, the accelerator will bind or crack.

The mechanism must be mounted perfectly parallel to the ejector plate movement. Any angular misalignment causes severe side loading, friction and uneven movement between the components, leading to rapid wear and potential breakage of the linkage or the plate guide pins.

Loose mounting screws will allow the device to shift under the high dynamic forces of ejection and return. This alters the stroke ratio, misaligns the plates, reduces force transfer and will eventually shear the fasteners or damage the device. Correct torque and thread locker are recommended.

No. The stroke ratio is defined by the internal geometry, pivot positions or rack profile, which are precision machined and hardened. Attempting to modify the components, grind the linkages or alter the mounting points will destroy the geometry and cause the device to fail or lock up.

Before testing under power, operate the ejector assembly manually or very slowly at low pressure. Confirm that the plates move smoothly without shuddering, that the stroke limits are not exceeded, and that the accelerated plate returns fully and sits flush before closing the mould.

They can be reused if the new mould shares the same required load, stroke, ratio, plate thickness and mounting pocket geometry. However, because they are subject to wear, transferring an old accelerator to a new mould may introduce unpredictable performance. It is safer to install new units for new tools.

Identify the manufacturer, part number, overall dimensions, mounting hole locations, base stroke and amplified stroke. A photograph of the device and its installation pocket, alongside the mould assembly drawing, is essential for confirming the exact replacement when the original markings are worn.

Shuddering indicates uneven movement. This can be caused by accelerators failing to operate symmetrically, worn components, plate racking, inadequate lubrication, distorted guide pins, or one device slipping. The mould must be inspected to ensure all devices and guides share the load evenly.

Breakage is usually caused by excessive ejection force, machine over-stroking past the device's physical limit, severe high-speed impact, asymmetric loading, loose mounting bolts, or operating the mechanism without lubrication. The root cause of the overload must be corrected.

If the plate does not return, the accelerator mechanism may be jammed with debris, lack lubrication, be bent due to overload, or the mould return springs/pins may be too weak to push the plate back through the device. Inspect the device for binding and check the return-force calculation.

Backlash usually results from wear within the accelerator mechanism (such as worn pivots, links or racks) after many cycles, or from loose mounting bolts. A small amount of play may be acceptable, but excessive play changes the ejection stroke and requires device replacement.

Rapid wear is caused by a lack of grease, operating at speeds higher than recommended, abrasive dirt entering the housing, high continuous operating temperatures degrading the lubricant, or continuous overloading. Regular cleaning and correct lubrication are necessary.

Because it is a precision assembly with interacting hardened components, repairing a broken device in a toolroom is rarely effective and can compromise safety and timing. The complete assembly should be replaced, and the remaining devices in the mould set should be carefully inspected.

Clean the exterior to remove dirt and polymer dust, inspect the mounting fasteners for tightness, check the plates for parallel movement, assess internal play, and apply the recommended high-pressure grease to the specified lubrication points. Verify that the stroke limits have not been exceeded.

Price depends on the specific design mechanism, load capacity, overall dimensions, stroke ratio, materials used, order quantity, and whether the item is standard or custom. We provide an accurate quotation after reviewing the exact model and application requirements.

While standard units may be available in small quantities suitable for a single mould, minimum order quantities can apply based on the specific model, customisation, and stock availability. Please confirm the MOQ and lead time along with your pricing inquiry.

They are typically coated with rust-preventative oil and packed in sturdy boxes or cartons. Because they contain precision moving parts, packaging must prevent impact, crushing, or dirt ingress during transit. Export orders receive appropriate protective layers and commercial documentation.

Common sizes and stroke ratios are often maintained in stock for prompt dispatch. However, specific high-capacity variants, unusual ratios or custom models require a manufacturing lead time. Request current stock availability before scheduling urgent mould repairs or new builds.

Yes. Vardhman Dies & Mould Tools supplies precision components from Maharashtra directly to toolrooms and mould makers across India. We also handle international export orders, providing the correct protective packaging and necessary commercial documentation for safe delivery.

Use the website enquiry form, email or contact number. Provide the required dimensions, stroke ratio, load capacity, quantity and delivery address. Include the mould drawing for technical verification. Review the quotation, specification and lead time before authorising the purchase.