Last month, a customer from Ukraine left a message on our website: “I need to cut 40mm polystyrene foam boards, felt, corrugated cardboard and expanded polyethylene. What machine can you provide and can it meet my cutting needs?” We replied to his email promptly and made it clear that our CNC oscillating knife foam cutter with an integrated tool head system can fully satisfy his cutting requirements. We then developed the following configuration plan for him:
1. Integrated tool head system: Mounted on the X-axis, the integrated tool head system can be fitted with a POT pneumatic oscillating cutting tool (for through-cutting 40mm foam and EPE), a 350W grooving electric spindle (for milling blind holes and grooves in foam), a V-Cut bevel cutting head (for 45° chamfering on corrugated paper and foam), a creasing wheel tool (for damage-free fold lines on cartons) and a pneumatic punching head (for instant punching of carton handle holes).
2. Precision blade matching: For 40mm foam, 120mm long, 1.5mm thick cemented carbide tungsten steel blades are recommended; for expanded polyethylene, Teflon anti-stick long blades are suggested.
3. Independent zoned vacuum adsorption table: The table is divided into 8 independent air circuits, paired with a 7.5kW high-pressure centrifugal blower (vacuum pump) to ensure the negative pressure stays at ≤−20 kPa when processing air-permeable materials.
4. Heavy-duty frame and Z-axis clearance: A stress-relieved heavy-duty steel plate welded frame with internal reinforcing ribs is adopted to enhance tensile strength and minimize deformation. The Z-axis travel is customized to no less than 200mm.
We also equipped the machine with an automatic tool setter and a table height compensation system to ensure the mixed-material processing accuracy is controlled within ≤±0.1mm.
Why Multi-Material Processing Requires an Integrated Tool Head System Instead of a Single Tool
If you want to cut different materials and achieve different processing techniques — for example, you need grooving and punching besides cutting — a single tool will never work. To meet diverse cutting demands while improving production efficiency, an integrated tool head system is essential.
What Customers Really Need Is a Multi-Process Solution, Not Just a Cutting Machine
Looking back at the Ukrainian customer’s inquiry: 40mm polystyrene foam requires thick cutting; PE foam needs high-frequency cutting; felt requires anti-filament processing; corrugated cardboard needs creasing. This involves at least four sets of processing techniques. What the customer really needs is the processing capability of this CNC machine: whether one machine can deliver a multi-process solution.
Why Foam, Felt and Corrugated Board Cannot Share the Same Tool
40mm thick foam is hard and brittle, requiring a pneumatic oscillating knife; high-toughness felt needs thin-edge cutting at extremely high speed to reduce dragging; corrugated paper requires not only cutting but also creasing rollers to make indentations, plus rear-angle double-edged blades to prevent corner drawing. Sharing one tool will sharply reduce processing efficiency and aggravate edge wear. They simply cannot use the same tool. The selection principle is: tool matches process.
How the Integrated Tool Head System Realizes Coordinated Cutting, Creasing, Grooving and Punching
The Trustercnc integrated tool head cutting system adopts a multi-station integrated slide plate. Multiple independently lifting tool heads are integrated in the slide module, controlled by micro servos. Under G-code commands from the main controller, different tools work in coordination: the oscillating knife handles contour cutting, the bevel cutter forms folded edges, the milling cutter performs grooving, the creasing wheel makes fold lines, and the punching tool drills holes.
Which Industries Benefit Most from Multi-Tool CNC Oscillating Knife Cutting Solutions
Typical industries include packaging liners, carton prototyping, automotive interiors, display props, advertising models and industrial cushion packaging. These industries feature fast-changing orders and a wide range of materials, making the CNC oscillating knife cutting machine an ideal cutting equipment for them.
For more advantages of integrated tool head systems, please refer to: Benefits of Modular Tool Heads in CNC Oscillating Knife Cutters
Processing Characteristics of 40mm Polystyrene Foam, PE Foam, Felt and Corrugated Board
Processing 40mm polystyrene (EPS/XPS) requires dealing with static debris accumulation from cell breakage and tip deflection at long blade tips; cutting expanded polyethylene (PE) faces strong surface compression damping resistance, which easily causes rebound tolerance; cutting felt, due to fine fiber entanglement, often leads to severe filament drawing and uneven sections; for multi-layer corrugated board, cutting is only the first step — more important is precise folding and creasing compression stability.
Processing Characteristics and Cutting Difficulties of 40mm Polystyrene Foam Board (EPS/XPS)
40mm EPS (expanded polystyrene) mostly has a density between 15 – 30 kg/m³, usually light, brittle with obvious pores. When cutting with an oscillating knife, the clamping resistance on the blade tip at 40mm depth easily causes lateral micro displacement. In addition, high-speed cutting of foam particles generates electrostatic waste debris, which must be cleaned immediately by a suction hood, otherwise it will attach to the machine guide rails.
Why Expanded Polyethylene (PE Foam) Is Prone to Compression and Dimensional Errors
PE (polyethylene foam/pearl cotton) has extremely strong toughness, with a high elastic modulus and molecular resilience. When the vertical cutting speed of the mechanical blade is too slow or the feed rate is too high, the blade will “push down” the elastic foam and cause compression deformation. After release, the cut seam section shrinks, forming irregular bevel tolerance.
Why Felt Cutting Easily Causes Filament Drawing, Deformation and Uneven Edges
Felt is a non-woven dense fiber interwoven body with strong horizontal tensile rigidity. During mechanical cutting, if the micro blade edge is blunt and there is no vertical reciprocating cutting (such as direct drag knife scoring), fibers will be forcibly pulled out before being cut off, resulting in severe burrs, filament drawing and overall local deformation on the edges.
Why Corrugated Board Needs Not Only Cutting but Also Folding Forming Process
Corrugated board is composited of double-sided cardboard and internal wavy corrugated core paper, used to make shipping outer boxes. Its physical application requires not only precise contour cutting, but also precise roller creasing to ensure perfect physical stress during carton folding and splicing, with no surface cardboard rupture at the bends.
According to industry data from the International Corrugated Case Association (ICCA), packaging sample development usually involves at least two processing techniques. Therefore, a single tool system is usually insufficient.
Source: https://www.iccanet.org
How One CNC Oscillating Knife Cutting Machine Completes All Processes via Integrated Tool Head System
A combined slide mechanism with multi-tool holders is configured on the X-axis. Through the control system’s adjustment of servo-driven slide movements, each tool lifts and avoids independently during processing without interfering with each other.
The oscillating knife is responsible for through contour cutting, the bevel cutter specially forms folded edges, the electric spindle milling cutter precisely cuts blind grooves, the creasing wheel presses smooth fold lines, and the pneumatic punch punches standard round holes instantly.
What Materials and Tasks Does the Oscillating Knife Handle
The pneumatic oscillating knife (POT) mainly undertakes peripheral through-cutting of 40mm polystyrene foam and PE pearl cotton in the machine. Driven by a constant compressed air pressure of 0.6 – 0.7MPa, it provides high-frequency vertical vibration of 8,000 times per minute, and can cut thick materials at a speed of up to 800mm/s with clean, non-shrinking edges.
How the Bevel Cutter Completes Folded Edges, Bevels and Structural Edges on Corrugated Board
The bevel cutting tool is specially used for V-groove folding edges on corrugated paper or PE foam boards (supporting 0°, 15°, 30°, 45°angle customization). The tool scores half-cut lines on the board at a specific inclination. When folded, the two 45° inclined surfaces of the cut form a perfect 90° rigid vertical edge.
How the Milling Cutter Performs Foam Grooving, Cavity Milling and Local Material Removal
For packaging inner walls, the oscillating knife cannot perform non-through grooving. The 350W high-speed electric spindle milling cutter mounted on the slide (equipped with a single-edge foam milling cutter, speed adjustable to 24,000 RPM, maximum 60,000 RPM) cuts in automatically, precisely removes 20mm thick foam, mills counterbores, and creates positioning cavities for precision workpieces.
How the Creasing Tool Improves Corrugated Board Folding Accuracy
The creasing tool is fitted with a hard high-strength steel creasing ring. Under constant vertical pressure, the creasing wheel rolls back and forth along the cardboard folding path (creasing depth is generally 30%-60% of the cardboard thickness), forming fold lines. It compacts the paper pulp without cutting through fibers, providing extremely high precision and compression bending performance for carton folding, effectively protecting the cardboard, avoiding edge bursting and improving fold angle consistency.
How the Punching Tool Completes Positioning Holes, Handle Holes and Functional Holes
The high-speed punching machine can punch a perfectly standard burr-free handle hole in microseconds via high-pressure piston impact, with no cotton powder obstruction. Typical hole types include round holes, positioning holes, handle holes and buckle holes, requiring no secondary processing and improving efficiency. The punching diameter range of Trustercnc punching tools is 0.3 – 4mm.
How Multi-Station Systems Reduce Manual Tool Change Time
All processing techniques are completed through automatic tool change by the control system, no manual tool change is needed. This reduces manual tool change time and downtime, and improves production continuity.
How to Choose Blades: Blade Type, Length and Angle for Different Materials
When cutting 40mm medium-thickness brittle polystyrene, flexible PE foam, dense felt and stiff corrugated paper, the blade edge angle and thickness must be quantitatively matched to the bending and shear stiffness of the material. If the tip hardness is insufficient or the geometric rear cutting angle is too small, the blade edge is prone to deflection or even breakage at a feed rate ≥5000mm/min.
Studies show that when mechanically cutting soft materials and foamed plastics, the tool geometry, friction coefficient and stress feedback directly affect section deformation. Relevant research results can be found in Elsevier journal papers, such as “Cutting force prediction and analysis in machining of soft polymers using oscillating blades” and “Deformation and fracturing mechanics of cellular foam polymers during knife-cutting”.
Research results on cutting resistance prediction of reciprocating blades in foamed polymers in this field can be viewed on the Elsevier journal database. Configuring suitable tungsten steel coated blades can physically ensure smooth cutting edges and extend cutting cycles.
Recommended Blade Solution for 40mm Polystyrene Foam
Blade length selection: For cutting 40mm thick foam, the total blade length must be no less than 60mm (reserving 8mm polarization margin for each of the upper and lower dead points of Z-axis high-frequency amplitude) to prevent incomplete cutting at the bottom.
Rigidity and verticality: To prevent deflection, the blade thickness is recommended to be customized to 1.2mm, and the rear cutting angle of the edge is set to an extremely thin 30° to prevent lateral displacement of the tool, controlling the deflection angle within ≤0.5°.
Recommended Blade Solution for Expanded Polyethylene
Blade and high-frequency cutting combination: PE foam has high toughness. It is recommended to use cemented carbide double-edged straight blades with 20mm edge width and 1.0mm thickness. Matched with the large-amplitude reciprocating impact of the POT pneumatic cutting knife, it quickly tears closed-cell fibers, and the feed rate is adjusted to about 500 mm/s.
Recommended Blade Solution for Felt
Reduce fiber pulling: Fiber felt is most vulnerable to drag cutting. It is recommended to configure short blades with a small cutting angle of 20° -30°, matched with 200 Hz vibration, to cold-shear the material instantly before the fibers deform, minimizing fiber pulling and ensuring no filament drawing or fuzzing on the section.
Recommended Blade Solution for Corrugated Board
Combination of straight knife, bevel cutter and creasing wheel: For through-cut contours of corrugated board, alloy hard thin straight blades with 10mm edge width and 45° rear bevel angle are recommended; for bevel cutting, tungsten steel blades are used for V-groove scoring at 45° inclination; for creasing, standard stainless steel creasing ring rollers are installed.
Recommended sequence: creasing → bevel cutting → outer contour cutting, to reduce cardboard deformation.
Why the Vacuum Adsorption System Determines Multi-Material Processing Stability
Whether it is lightweight 40mm foamed polyester, highly resilient PE foam, fiber-permeable felt or edge-curling corrugated board, they are prone to horizontal displacement or edge bulging when subjected to reciprocating shear resistance from high-frequency vibrating blades and rotational axial cutting force from high-speed milling cutters. Minor displacement during processing will directly cause product size deformation or even blade breakage.
The vacuum adsorption system uses strong suction to firmly fix the material on the table, preventing material deviation during cutting. The Trustercnc multi-zone matrix adsorption platform is divided into 8 adsorption zones, each can be controlled independently, and corresponding zones can be activated according to the material laying range.
Why Foam Materials Are Prone to Displacement
Since the density of foamed foam is generally only 20 – 40kg/m³, the material has low self-weight and large wind resistance area, and the cutting force will push the material to move. The material is very easy to shift horizontally under lateral friction pulling, causing large tolerance.
Why Corrugated Board Is Prone to Edge Curling
The internal structure of the cardboard stores stress. Uneven internal stress will cause the edges of the entire board to curl upward in an arch shape.
Why Felt Is Prone to Local Bulging
Felt is a flexible non-woven material with a thickness of generally 3-8mm. Due to lack of mechanical rigidity, when the high-frequency vibrating tool cuts down and turns quickly, the local air damping reverse thrust will cause local bulging and misalignment in the middle of the felt that is not firmly adsorbed.
How the Zoned Vacuum Adsorption System Adapts to Different Materials
The Trustercnc standard model (1600 × 2500mm) divides the table into 8 adsorption zones, which can be activated individually according to material size. For example, when processing small-format corrugated paper or thick foam, the operator can close the solenoid valves of zones not covered by the material, concentrating all the large air volume of the vacuum pump (generally 5.5kW or 7.5kW) on the processing area to form concentrated adsorption.
Recommended Adsorption Pressure and Zoning Strategy for Different Materials
For highly air-permeable 40mm foam and breathable felt, a high-airflow centrifugal vacuum pump must be activated to maintain the minimum dynamic negative pressure on the processing surface at no less than −20 kPa; the table negative pressure can reach as high as −25 kPa to −30 kPa, which adsorbs and flattens deformed cardboard.
Why Processing Sequence Affects Final Quality in Multi-Material Processing
From conversations with many customers, we learned that many workshop operators often ignore the processing sequence. As a result, foam or cardboard with the outer contour cut first loses the structural rigidity support of the large board, and undergoes overall deviation and distortion under vacuum negative pressure pulling during subsequent grooving, creasing or punching.
In multi-layer and mixed-process production, you must follow the principle: internal semi-through processes first, then external full-through trajectories; high-torque extrusion actions first, then fast cold cutting paths.
Why Foam Usually Completes Grooving Before Contour Cutting
After through-cutting the outer contour, 40mm thick foam becomes an independent isolated block, and the friction contact surface with the table is greatly reduced. If hole drilling and blind groove milling (which generates large cutting torque from the electric spindle) are processed after through-cutting the outer contour, the rotating milling cutter force will instantly carry and break the already cut isolated sponge block.
Why Corrugated Board Is Recommended to Be Creased Before Cutting
When the creasing wheel works, it pushes down by air cylinder, applying extremely high normal local extrusion force to the table. Creasing must be performed before the stiffness of the entire corrugated board is damaged by cutting, so that the paper fibers will not produce tensile wrinkles.
The principle of creasing → punching → edge cutting should be followed for more stable folding.
Is It More Reasonable to Punch Before or After
The punching tool uses high-pressure pneumatic instant punching. To avoid local micro-vibration of the board caused by high-pressure air recoil, it must be programmed before full through-cutting (oscillating knife cutting). Punching positioning holes first facilitates subsequent tool cutting and avoids material offset after contour completion.
How to Reduce Position Errors Caused by Tool Switching
The Trustercnc control system is equipped with a high-precision automatic tool setter, which can automatically measure the mechanical error of the tool at the Z-axis height and perform automatic tool offset compensation before processing starts, thus eliminating multi-process position drop tolerance caused by manual tool adjustment during switching.
What Is a More Reliable Recommended Configuration for Such Mixed-Material Orders
For the cutting, grooving and creasing processes of these four materials with completely different mechanical properties, you must weigh the combination depth of equipment hardware configuration instead of blindly pursuing the highest configuration. A reasonable and reliable equipment configuration plan should be scientifically customized based on your actual daily processing volume, prototype complexity and future expansion scope.
Whether you want to configure tools individually or in combination, Trustercnc can provide one-stop customized services for your equipment from slides to main control algorithms through modular hardware interfaces.
Basic Configuration Plan (Suitable for Standard Cutting Needs)
If your workshop mainly processes medium-thin cardboard outer boxes, small felt prototypes, and through-cutting outer frames of ordinary foamed pearl cotton below 100mm:
- Recommended configuration: 1200x1000mm working area table + POT high-frequency pneumatic oscillating knife head + standard bevel cutter
- Vacuum system: 5.5kW single-zone vortex vacuum pump
- Applicable scenarios: start-up custom packaging factories, prototype studios, small and medium-sized bag processing shops
Upgraded Configuration Plan (Suitable for Complex Packaging Sample Development)
If you undertake a large number of high-end tool cases and flight case composite packaging gaskets, and need to balance precision milling of thick EVA blind grooves and cardboard creasing prototypes:
- Recommended configuration: Trustercnc integrated tool head system (POT pneumatic knife + V-Cut bevel cutter + 350W milling electric spindle + creasing wheel + pneumatic punch)
- Vacuum system: 7.5kW medium-pressure large-flow blower (matched with 8-zone solenoid valve table control)
- Applicable scenarios: high-end protective case packaging customization factories, electronic industrial accessory inner supporting factories
Key Indicators to Observe During Equipment Sample Testing
If you are cautious about purchasing the machine, it is recommended to conduct an on-site visit. When observing the CNC oscillating knife cutter testing samples on 40mm foam, felt and other materials on site, you need to focus on the following hard-core indicators:
1. Side section verticality tolerance: Measure the cut 40mm foam with a vernier caliper and depth gauge to check whether the size deviation between the upper surface and the bottom surface is within ≤±0.1mm, to detect bottom blade pulling.
2. Corner surface fuzzing degree: Use a high-power microscope to focus on the 90° corner of the felt, check whether the fibers have severe pulling, cracking or fuzzing whitening, to test the smooth deceleration algorithm of trajectory interpolation.
3. Creasing bending test: Fold and splice the creased corrugated cardboard manually. Observe whether there is micro cracking on the cardboard surface at the fold angle and whether the fold line is straight, to test the creasing wheel pressure and pulp compaction accuracy.
4. Processing noise and vibration resonance: When the high-power electric shaft rotates at high speed and multiple tool heads vibrate reciprocally, touch the machine base frame by hand to feel whether the anti-vibration damping and machine weight provide solid physical support.
FAQs
When the creasing wheel presses fold lines on corrugated board, it always cracks the paper surface and causes burst lines, making the folded carton look bad. How to adjust?
Creasing surface cracking is very common in carton processing. It is mainly caused by wrong selection of creasing wheel width, or excessive proportional pressure of downward air resistance, which causes paper fibers to exceed the yield limit when stretched.
Solutions:
1. Match creasing wheel specifications according to cardboard layers: For single-wall (3-layer) cardboard, narrow creasing wheels with edge width of 1.0–1.5mm are recommended; for double-wall (5-layer cardboard, such as A and B flute composite), due to greater thickness, wide double-track creasing wheels with edge width of 2.5–3.5mm must be used to leave sufficient compression and collapse space for the corrugations.
2. Install a precision proportional valve for pressure adjustment: Add a proportional valve to the control air circuit. The system can precisely control the downward pressure between 0.2–0.4 MPa in the software with one click according to the grammage and material of the cardboard, avoiding bluntly breaking fibers due to excessive air pressure.
When cutting thick felt, even with the suction fully on, if the knife moves fast (e.g., feed rate over 500mm/s), the felt will still be pulled and displaced by the knife. How to solve this?
Felt has a non-woven structure with interwoven fibers inside. Even with full suction, there are many tiny pores on the felt surface, so air leaks and the actual adsorption negative pressure attenuates. When the long blade advances at high speed, once the shear drag force exerted by the felt fibers on the blade exceeds the current adsorption friction, the material will undergo overall pulling deformation or deviation.
Solution:
Film overlay method: Cover the top layer of the laid felt with a very cheap ordinary PE stretch film with a thickness of only about 0.01mm. After starting the suction fan, since the PE film is air-impermeable, the airflow cannot penetrate, and will firmly “press” the PE film together with the entire felt underneath onto the table. During processing, the oscillating knife cuts through both the film and the felt, and the effect is excellent.
I installed the electric spindle milling cutter and oscillating knife together. The milling cutter grooves 20mm deep, and the oscillating knife cuts the outer ring. How do I ensure the cutting depths of the two tools do not interfere with each other and the height is absolutely precise?
1. Use a high-precision electronic automatic tool setter: Trustercnc’s high-rigidity tool setting sensor (automatic tool setter) can fully solve this problem. Before processing, the spindle milling cutter and oscillating knife tip will touch the tool setter one after another. The system can automatically calculate the physical height difference (Z-Offset) between the two with an accuracy of ≤±0.01mm, and automatically perform difference compensation in the CNC register (G54 coordinate offset).
2. Independent axial cylinder lifting mechanism: The electric spindle and oscillating knife slides each have an independent pneumatic avoidance slide. When the spindle milling cutter descends to work, the oscillating knife cylinder will automatically ventilate, lifting the oscillating knife head vertically upward by 50mm overhang, so the blade tip will never scratch the foam.
When cutting 40mm polystyrene foam board (especially extruded board XPS), the edges always chip and shed debris. How to adjust to make the cut smoother?
Although XPS extruded board has high hardness and compact structure, it is a typical brittle closed-cell structured foamed polymer. Edge “chipping and debris shedding” physically belongs to cell wall crushing. This is usually because your transverse feed rate is too fast, causing the horizontal tangential force of the blade tip to forcibly “crush” the foam cells before they can be broken by high-frequency vibration.
Adjustment suggestions:
1. Reduce feed rate and increase vibration frequency: Lower the feed speed to 1500–2500 mm/min, and turn the oscillating knife controller frequency to the maximum (no less than 12,000 RPM) to ensure the blade tip performs micro-cutting with ultra-small step distance.
2. Use narrow-angle double-sided ground blades: Blades must be thin double-edged with cutting edge inclination ≤18° and micro-polished, to minimize cutting resistance with an extremely sharp geometric angle and achieve smooth cuts.
My creasing tool works well on 3-layer A-flute cardboard, but when switched to ultra-thin E-flute cardboard, the creases are almost invisible and the folding does not follow a straight line. Do creasing wheels also come in different sizes?
Yes, creasing wheels have different sizes. The physical specifications of the creasing wheel (mainly the fillet radius R of the wheel groove edge and wheel thickness) must be strictly aligned with the flute height and number of paper layers of the corrugated board.
A-type flute: Flute height is between 4.5–5.0mm, the cardboard is thicker and has a large collapse stroke. A creasing wheel with a large fillet radius (e.g., R1.5mm) and wide contact surface is required to evenly flatten the high corrugations without breaking the surface linerboard.
E-type flute: It is an ultra-thin flute with a flute height of only 1.1–1.2mm. If you still use a blunt A-flute creasing wheel, the pressure is too dispersed to form effective creases on the ultra-thin cardboard.
When Processing Corrugated Board, When Is It Necessary to Add a Creasing Tool?
It is recommended to add a creasing tool if any of the following conditions are met:
Folding is required later
Three-dimensional structure is involved
Double-wall corrugated or thicker
Gift box packaging
Display structure
Without creasing, problems such as edge bursting, fold angle cracking and fold line deviation are likely to occur, especially for B-flute and EB-flute boards.
References and Information Sources
Altintas, Y., & Erkorkmaz, K. (2012). Fast and high precision control approach: Polyline analysis and optimal NURBS interpolation for CNC machine tools. The International Journal of Advanced Manufacturing Technology.
https://link.springer.com/article/10.1007/s00170-012-4069-4
Altintas, Y., & Tulsyan, S. (2014). Accurate prediction of machining feedrate and cycle times considering interpolator dynamics. The International Journal of Advanced Manufacturing Technology.
https://link.springer.com/article/10.1007/s00170-014-6067-5
International Corrugated Case Association (ICCA). Corrugated packaging industry resources.
https://www.iccanet.org
Altintas, Y. (2012). Manufacturing Automation: Metal Cutting Mechanics, Machine Tool Vibrations, and CNC Design (2nd ed.). Cambridge University Press.
Elsevier Science. (n.d.). Cutting force prediction and analysis in machining of soft polymers using oscillating blades. International Journal of Machine Tools and Manufacture. https://www.sciencedirect.com/journal/international-journal-of-machine-tools-and-manufacture
Springer Nature. (n.d.). Fast and high precision control approach: polyline analysis and optimal NURBS interpolation for CNC machine tools. The International Journal of Advanced Manufacturing Technology. https://link.springer.com/journal/170
