TRIMMING PRESS
Efficiency, Edge Quality, and The Removal of Secondary Operations
Press for Die Casting, Forging & Plastics
High-Precision Edge Finishing and Flash Removal
Precision trimming is a critical final stage in the production of die-cast and forged components. Our hydraulic and servo-mechanical trimming presses are engineered to remove flash, runners, and overflows with high repeatability, ensuring clean edges and protecting your secondary tooling from premature wear.
For an overview of related forming processes and industry-specific solutions, explore our Press Applications resource hub.
At MetalPress Machinery, we provide heavy-duty hydraulic and servo-hydraulic trimming solutions engineered for high-duty cycles and the clean shearing of aluminum, zinc, magnesium, and advanced composites.
SEVEN TRIMMING PRESS OPTIONS
Every MetalPress Machinery forging and trimming press is engineered for rigidity, repeatability, and longevity. High-Quality Hydraulic Forging Press & Trimming Die Casting Press Solutions:
4 POST PRESS
4 POST SERVO PRESS
STRAIGHT SIDED SERVO PRESS
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MINTING PRESS
TECHNICAL ADVANTAGE
FOR TRIMMING MANUFACTURERS
Every MetalPress hydraulic press for forging is built to a standard that prioritizes safety and forging press dies longevity:
Hydraulic Overload Protection: Standard on all models to instantly release pressure during a jam, preventing catastrophic frame or die damage.
Advanced Control Systems: Integrated User-Friendly PLCs allow for easy "recipe" storage, ensuring faster setup times for recurring jobs.
Enhanced Drive Systems: Our presses utilize advanced lubrication and high-efficiency motors to reduce noise and energy consumption during continuous operation.
Safety Compliance: Fully compatible with modern light curtains and dual-hand safety controls to ensure a secure working environment.
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RIGHT PRESS.
RIGHT STAGE.
BUILT FOR SAFE METAL TRIMMING
Every MetalPress mechanical machine is engineered to a standard that prioritizes operator safety and machine longevity. We are the top press forge company.
Hydraulic Overload Protection
Standard on all models. Instantly releases pressure during a jam to prevent catastrophic frame or die damage.
User-Friendly PLC Control
Integrated recipe storage means faster setup times on recurring jobs. Less downtime between changeovers.
Enhanced Drive Systems
Advanced lubrication and high-efficiency motors reduce noise and energy consumption during continuous operation.
Safety Compliance
Fully compatible with modern light curtains and dual-hand safety controls for a secure working environment.
Choosing the Right Press Configuration & Press Frame
We offer different types of trimming presses, die casting presses, forging presses, and plastics presses among which the most versatile press types are as follows.
The Industry Standard: Hydraulic Trim Press
The Trim Press is our specialized solution for the die-casting industry. Designed with high-speed approach and retract cycles, it is optimized for the rapid removal of flash from aluminum and zinc castings. Its open design allows for easy integration with robotic pick-and-place systems.
High-Stability Trimming: 4-Post Hydraulic Press
For larger forgings or multi-cavity trim dies, the 4 Post Hydraulic Press offers superior structural stability. The four-post design ensures that the upper platen remains perfectly parallel to the die, extending tool life and ensuring a consistent shear across the entire perimeter of the part.
Advanced Control: 4-Post Servo Press
The 4 Post Servo Press is recommended for trimming structural plastics, carbon fiber, or high-strength forgings. By utilizing Servo-Hydraulic control, you can precisely manage the "breakthrough" force, significantly reducing the noise and mechanical shock associated with heavy trimming operations.
Cold Forging: 4-Post Servo Press
The Straight-Sided Mechanical Press (also known as Straight Press) is recommended as high-speed cold forging press machine while the Servo Straight Press provides optimum precision control. Our mechanical forging press is available in crank press types, including single and double.
Engineering For
Edge Quality
Impact Shock Absorption: Our presses are equipped with advanced hydraulic cushioning to absorb the "breakthrough" shock when the material shears, protecting your dies from premature cracking.
Rapid Cycle Times: High-speed valves and optimized hydraulic circuits ensure that the press keeps pace with the fastest die-casting machines.
Parallelism & Precision: Precision-ground platens and heavy-duty guidance systems ensure that the trim tool meets the part with zero offset, providing a "burr-free" edge.
Material Compatibility for TRIMMING Presses
Trimming is a versatile process, but the “shearability” of a part depends heavily on its material properties. Below is a guide to the most common materials processed using our Trim, 4-Post, and Straight-Sided presses.
Aluminum Die Castings
Aluminum is the most common material for trim press applications due to its widespread use in automotive and electronic housings.
Characteristics: Relatively soft but can be “gummy” if the alloy has high silicon content.
Trimming Note: Requires high-speed shearing to ensure a clean break and prevent the metal from dragging or smearing along the trim edge.
Recommended Press: Trim Press for standard cycles or 4-Post Servo Press for structural vacuum castings.
Zinc & Magnesium Forgings
These materials are often used for high-precision, lightweight components that require extremely thin flash removal.
Characteristics: Zinc is very fluid and produces thin, sharp flash; Magnesium is lightweight but brittle.
Trimming Note: Low shear strength allows for lower tonnage but requires high precision in die alignment to avoid cracking the main body of the part.
Recommended Press: Trim Press.
Mild & Alloy Steel Forgings
Heavy-duty industrial and agricultural forgings often come out of the hammer with thick, tough flash.
Characteristics: High shear strength and high temperature (if trimmed hot).
Trimming Note: Requires maximum frame rigidity and massive tonnage. The “breakthrough” shock is significant, making hydraulic dampening essential.
Recommended Press: Straight-Sided Servo Press.
Industrial Plastics & Composites
Trimming is used to remove overflow from injection molding or to profile thermoformed sheets.
Characteristics: Highly variable; some plastics are brittle while composites (like Carbon Fiber) are abrasive.
Trimming Note: Often requires programmable stroke speeds to prevent shattering or “whitening” of the plastic edges.
Recommended Press: 4-Post Servo Press.
| SHEAR STRENGTH & TONNAGE GUIDE | ||
| Material | Typical Shear Strength (PSI) | Tonnage Requirement |
| Plastics / Composites | 8,000 – 12,000 | Low |
| Magnesium Alloys | 17,000 – 20,000 | Low to Medium |
| Aluminum (Die Cast) | 23,000 – 30,000 | Medium |
| Mild Steel | 45,000 – 55,000 | High |
Download the Engineering Guide to Metal Trimming & Forging
Trim Force Calculator
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Trimming Press Selection Guide for Die Casting, Forging, Plastics and Composites
A trimming press removes flash, runners, gates, overflows and excess material after die casting, forging or molding. The press must deliver the required cutting force while controlling breakthrough shock, maintaining tool alignment and moving finished parts and scrap safely through the cell.
Selecting a trim press requires more than a tonnage estimate. Material shear strength, total cut perimeter, wall thickness, trim-tool geometry, part support, bed size, daylight, stroke, cycle time, scrap evacuation and automation interfaces all affect the final machine specification.
Which Trimming Press Configuration Fits the Process?
| Press configuration | Primary advantage | Typical trimming application |
|---|---|---|
| Hydraulic Trim Press | Purpose-built trimming platform with accessible working area and available unloading functions | Die-cast parts, molded components, flash removal, piercing and finishing |
| 4-Post Hydraulic Press | Four-side access and flexible tooling or part-handling integration | Varied trim dies, general finishing and lower-to-medium production programs |
| 4-Post Servo-Hydraulic Press | Programmable approach, cutting and return profiles with accessible automation | Flexible cells requiring recipes, repeatable motion and controlled breakthrough |
| Straight-Sided Servo-Hydraulic Press | Rigid closed-frame support and programmable hydraulic control | Larger trim tools, off-center loading and demanding precision applications |
Trimming Press Specification Factors
Cutting force
Calculate from the total sheared perimeter, material thickness and shear strength, then account for simultaneous cuts and a suitable process margin.
Tool and working area
Confirm die footprint, clamp locations, shut height, scrap openings and access for installation or maintenance.
Stroke and daylight
Allow enough travel and opening for the part, trim die, loading method, finished-part removal and scrap handling.
Breakthrough control
Evaluate hydraulic cushioning, deceleration and frame response when the cut releases stored energy suddenly.
Cycle and automation
Define approach, trim and return times together with robot reach, part orientation, interlocks and upstream machine cycle.
Ejection and scrap
Plan ejectors, air blast, conveyors, chutes and sensing so parts and trim scrap cannot interfere with the next cycle.
Estimating Trim Force
A starting estimate multiplies the total cut perimeter by material thickness and material shear strength. The engineering calculation must also reflect the number of edges cut at once, blade or punch geometry, temperature, casting condition and process margin.
The final press rating should be confirmed from the actual part and trim-tool design. Nominal part size alone does not determine required tonnage.
Managing Breakthrough Shock
When flash or a gate separates, stored energy can release abruptly. Excess breakthrough can increase vibration, noise, tool wear and frame loading.
Controlled slide speed, hydraulic cushioning, proper tool support and an appropriate press frame help manage the event while maintaining edge quality and machine life.
Common Trimming Problems and Investigation Points
| Result | Possible contributors | Items to evaluate |
|---|---|---|
| Heavy burrs | Worn cutting edges, clearance, alignment or part support | Tool condition, clearance, guidance, shut height and fixture stability |
| Incomplete flash removal | Insufficient stroke, force, penetration or inconsistent part location | Tonnage, slide position, locator condition, tooling and part variation |
| Part distortion | Poor support, uneven loading, trim sequence or excessive force | Fixture support, cutting order, pressure profile and tool alignment |
| Tool chipping or short life | Breakthrough shock, misalignment, material variation or poor scrap clearance | Cushioning, guidance, tool material, lubrication and scrap evacuation |
| Cell interruptions | Scrap jams, inconsistent loading, sensor placement or timing | Chutes, conveyors, ejectors, sensing, robot sequence and interlocks |
Related Trimming and Die-Casting Resources
Information Needed for a Trimming Press Engineering Review
Provide the part and trim-tool drawings, material, thickness, total cut perimeter, expected force, die size, stroke, daylight, cycle target, part temperature, loading method, scrap plan and any ejector, conveyor, robot or safety requirements. The existing MetalPress General Form on this page can be used to submit these details.
Frequently Asked Questions About Trimming Presses
What does a trimming press remove?
A trimming press removes flash, runners, gates, overflows and other excess material from die-cast, forged, molded or formed parts. It can also perform piercing and related finishing operations.
How is trimming force estimated?
A starting estimate uses total cut perimeter, material thickness and shear strength. Tool geometry, simultaneous cuts, part condition and a process margin must also be considered.
Why is breakthrough shock important?
Stored energy releases when the material separates. Uncontrolled breakthrough can increase vibration, noise, tool wear and press loading, so slide speed, cushioning and frame selection matter.
Can a trimming press be robot loaded?
Yes. Trim presses can be integrated with robots, die-casting machines, part-orientation stations, ejectors, conveyors, scrap chutes and inspection equipment.
When is a straight-sided press appropriate?
A straight-sided frame is useful for larger tooling, higher forces, off-center loading or applications where frame rigidity and repeatability are priorities.
What should be included with a trim-press RFQ?
Send part and die drawings, material and thickness, cut perimeter, force estimate, working-area requirements, stroke, daylight, cycle time and the complete loading, ejection, scrap and safety concept.
Related Technical Guides
Review these technical guides for additional engineering context on Trim Presses, equipment selection, safety, and production planning.
- Metal Forming 101: Processes, Tooling, and How to Choose the Right Press
- Engineering the Right Solution: From First Contact to Assembly and Design of a Custom 35‑Ton Trim Press
- Engineering the Right Solution: From First Contact to Assembly and Design of a Custom 35‑Ton Trim Press
- Revolutionizing the Die Casting Industry: Unveiling the Power of Our Trim Presses