{"id":2380,"date":"2026-06-30T08:59:01","date_gmt":"2026-06-30T08:59:01","guid":{"rendered":"https:\/\/hydrauliccylindersprice.com\/product\/hydraulic-press-cushion-cylinder\/"},"modified":"2026-06-30T08:59:05","modified_gmt":"2026-06-30T08:59:05","slug":"hydraulic-press-cushion-cylinder","status":"publish","type":"product","link":"https:\/\/hydrauliccylindersprice.com\/es\/product\/hydraulic-press-cushion-cylinder\/","title":{"rendered":"Hydraulic Press Cushion Cylinder"},"content":{"rendered":"

<\/p>\n

<\/p>\n

\n
\n Hydraulic Press \u00b7 Cushion Cylinder<\/span><\/p>\n

The Cylinder That
Pushes Back<\/em><\/h2>\n

Every other press cylinder creates motion \u2014 pushes down, lifts up, shifts sideways, grips, tilts. The cushion cylinder is the only one that resists<\/em> motion. Mounted below the die, it provides a controlled counter-force that opposes the ram \u2014 absorbing shock, preventing workpiece distortion, and controlling material flow during deep drawing and forming operations.<\/p>\n

\n
\n
1,130 KN<\/div>\n
Max Counter-Force<\/div>\n<\/div>\n
\n
75\u2013300mm<\/span><\/div>\n
Bore Range<\/div>\n<\/div>\n
\n
\u2264500mm<\/span><\/div>\n
Stroke<\/div>\n<\/div>\n
\n
Resist<\/div>\n
Controlled Opposition<\/div>\n<\/div><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n \"Hydraulic<\/p>\n

Not Force \u2014 Counter-Force<\/h2>\n

The cushion cylinder sits below the lower die or blank holder plate, rod pointing upward. When the master cylinder drives the ram down, the cushion cylinder does not get out of the way \u2014 it pushes back. The ram must overcome both the workpiece’s forming resistance and the cushion cylinder’s counter-force to complete the press stroke. This counter-force is the key to controlled forming.<\/p>\n

In deep drawing \u2014 the process of forming a flat sheet into a cup, can, panel, or housing \u2014 the cushion cylinder provides the blank holder force that pins the sheet edges against the die face while the punch draws the centre downward. Without cushion force, the sheet edges pull inward uncontrolled and wrinkle. With too much cushion force, the sheet cannot flow into the die and tears. The cushion cylinder maintains the precise force window between wrinkling and tearing \u2014 the narrow band where a successful draw lives. Korea Ever-Power manufactures cushion cylinders as part of the industrial engineering hydraulic cylinder<\/a> programme.<\/p>\n<\/section>\n

<\/p>\n

\n

Technical Specifications<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
Product<\/td>\nHydraulic Press Cushion Cylinder<\/td>\n<\/tr>\n
Function<\/td>\nAbsorb forging displacement \/ shock vibration<\/td>\n<\/tr>\n
Bore Diameter<\/td>\n75 mm \u2013 300 mm<\/td>\n<\/tr>\n
Rod Diameter<\/td>\n50 mm \u2013 180 mm<\/td>\n<\/tr>\n
Stroke<\/td>\n\u2264 500 mm<\/td>\n<\/tr>\n
Maximum Thrust<\/td>\n1,130 KN (bore 300 mm \/ pressure 25 MPa)<\/td>\n<\/tr>\n
Working Pressure<\/td>\nUp to 25 MPa<\/td>\n<\/tr>\n
Certification<\/td>\nISO 9001 \u00b7 100% hydrostatic tested<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/section>\n

<\/p>\n

\n
\n

The Wrinkle-Tear Window \u2014 Where the Cushion Cylinder Lives<\/h2>\n

In deep drawing, the cushion cylinder’s blank holder force must fall within a narrow range. This range \u2014 the forming window \u2014 is bounded by two failure modes:<\/p>\n

\n
\n Too little cushion force \u2192 Wrinkling<\/strong><\/p>\n

The sheet edges lift off the die face and buckle inward as the punch draws the centre down. Compressive hoop stress in the flange region exceeds the material’s buckling resistance. The result is a wrinkled flange that cannot be flattened and must be scrapped. Wrinkling occurs when the blank holder force is insufficient to keep the sheet flat against the die face.<\/p>\n<\/p><\/div>\n

\n Too much cushion force \u2192 Tearing<\/strong><\/p>\n

The sheet edges are pinned so tightly that the material cannot flow inward to feed the draw. The tensile stress at the punch radius exceeds the material’s ultimate strength, and the part tears \u2014 typically at the bottom corner where the punch meets the cup wall. Tearing occurs when the blank holder force prevents the necessary material flow into the die cavity.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n

\n

The cushion cylinder’s job:<\/strong> maintain the blank holder force precisely between these two limits \u2014 throughout the entire draw stroke \u2014 even as the material properties change (work hardening, thickness thinning, friction variation). This requires proportional pressure control with feedback, not a fixed pressure setting.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

Two Operating Modes \u2014 Drawing Cushion vs Forging Shock Absorber<\/h2>\n
\n \"Cushion<\/p>\n

The cushion cylinder serves two different applications depending on the press type \u2014 and the engineering requirements differ significantly between them.<\/p>\n

Drawing cushion (stamping\/forming presses):<\/strong> The cushion provides a precisely controlled, variable-pressure counter-force that holds the blank edge while the punch draws the centre. The cushion force profile is typically programmed to vary during the stroke \u2014 higher at the start (to prevent initial wrinkling), gradually decreasing as the draw progresses and the material work-hardens (to prevent tearing). This is a slow, controlled, energy-absorbing operation.<\/p>\n

Shock absorber (forging presses):<\/strong> The cushion absorbs the impact energy when the ram hits the workpiece at the end of the press stroke. In free forging, the ram deceleration at workpiece contact sends a shock pulse through the press frame \u2014 the cushion cylinder below the lower die absorbs some of this energy, reducing the peak shock load on the foundation and the press structure. This is a rapid, high-energy, transient event \u2014 the opposite of the slow, controlled draw cushion.<\/p>\n

The same cylinder hardware can serve both functions \u2014 the difference is in the hydraulic circuit: proportional pressure control for drawing, energy-absorbing orifice for shock absorption. Korea Ever-Power specifies the valve arrangement based on the application.<\/p>\n<\/p><\/div>\n

<\/div>\n<\/section>\n

<\/p>\n

\n

500 mm Stroke \u2014 The Shortest in the Press Cylinder Range<\/h2>\n

The cushion stroke matches the draw depth or the forging displacement \u2014 not the ram travel. The ram may travel 3,000\u20134,500 mm, but the cushion only compresses during the final 50\u2013500 mm of that stroke \u2014 the forming phase. The approach phase (ram descending through air) does not engage the cushion at all.<\/p>\n

\n
\n Deep drawing<\/strong><\/p>\n

Draw depth of 50\u2013300 mm is typical for automotive panels and appliance housings. The cushion stroke matches this depth \u2014 the cylinder compresses exactly as far as the punch draws. Deeper draws (cups, canisters) may use up to 500 mm cushion stroke.<\/p>\n<\/p><\/div>\n

\n Forging shock absorption<\/strong><\/p>\n

The forging displacement \u2014 the amount the workpiece compresses during a single press stroke \u2014 is typically 20\u2013200 mm. The cushion stroke matches this displacement plus a margin for overtravel. The shock pulse duration is 10\u201350 milliseconds \u2014 far shorter than a drawing stroke.<\/p>\n<\/p><\/div>\n

\n Compared to other press cylinders<\/strong><\/p>\n

Master cylinder: \u22644,500 mm. Mobile workbench: \u22647,500 mm. Lateral shift: \u22645,500 mm. Return cylinder: \u22644,500 mm. Cushion cylinder: \u2264500 mm. The cushion needs only as much stroke as the forming or shock event requires \u2014 nothing more. More stroke would add cost and weight without benefit.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

Maintenance \u2014 Cushion Cylinders Wear Differently<\/h2>\n
\n \"Cushion<\/p>\n

The cushion cylinder’s wear pattern is unique among press cylinders because it operates in a short-stroke, high-frequency, energy-absorbing mode. The seals cycle over only 50\u2013500 mm of bore surface \u2014 meaning the same narrow band of bore is swept by the piston seals on every stroke. This concentrated wear zone can develop a polish ring or a micro-roughness change that the rest of the bore does not experience.<\/p>\n

On forging press shock absorbers, the energy absorption generates heat in the hydraulic fluid trapped inside the cylinder. Each shock pulse compresses the fluid and heats it \u2014 and because the cushion cylinder cycles frequently (every press stroke), the fluid temperature inside the cylinder can rise 20\u201340 \u00b0C above the bulk system temperature. This localised heating accelerates seal ageing in the cushion cylinder faster than in other press cylinders operating at the same system temperature.<\/p>\n

Korea Ever-Power recommends inspecting cushion cylinder seals at half the interval used for master cylinder seals \u2014 typically every 1,000\u20132,000 operating hours. The seal kit includes the piston seal, rod seal, wiper, and all O-rings. Field changeout without removing the cylinder from the press is standard \u2014 the rod-end gland is designed for in-situ removal. Contact the hydraulic cylinder maintenance team<\/a> for cushion-specific seal kit orders.<\/p>\n<\/p><\/div>\n

<\/div>\n<\/section>\n

<\/p>\n

\n \"Cushion
\n<\/section>\n

<\/p>\n

\n

OEM & ODM<\/h2>\n
\n
\n
\n

What You Provide<\/h3>\n<\/div>\n
\n

Application type (drawing cushion or forging shock absorber), required cushion force (KN), draw depth or forging displacement (determines stroke), number of cushion cylinders in the set, force profile requirement (constant or variable during stroke), and the press bolster drawing showing the cylinder mounting pockets. For variable-force applications: the force-vs-stroke profile or the part drawing for the engineering team to calculate it.<\/p>\n<\/div><\/div>\n

\n
\n

What the Factory Delivers<\/h3>\n<\/div>\n
\n

Engineering drawing with bore, rod, stroke, cushion force at working pressure, and recommended hydraulic circuit arrangement (proportional valve for drawing, orifice valve for shock absorption). Matched set if multiple cushion cylinders are specified. 100% hydrostatic test. Seal kits for accelerated maintenance schedule. Browse all industrial press cylinders<\/a>.<\/p>\n<\/div><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

FAQ<\/h2>\n
\n
\n

What is the difference between a cushion cylinder and a leveling cylinder?<\/h3>\n

They are different actuators with different timing in the press cycle. The leveling cylinder<\/a> acts BEFORE the press stroke \u2014 positioning the blank at the correct height. The cushion cylinder acts DURING the press stroke \u2014 providing counter-force as the ram deforms the workpiece. The leveling cylinder moves freely (no resistance); the cushion cylinder resists movement (controlled opposition). Some presses use both: leveling for setup, cushioning for forming.<\/p>\n<\/p><\/div>\n

\n

Can the cushion force be changed during the stroke?<\/h3>\n

Yes \u2014 this is called a variable blank holder force profile and it is essential for complex deep draws. The hydraulic circuit uses a proportional pressure valve controlled by the press PLC, which adjusts the cushion pressure at pre-programmed stroke positions. Modern systems update the pressure 100+ times per second, creating a smooth force curve that tracks the material’s changing forming behaviour throughout the draw.<\/p>\n<\/p><\/div>\n

\n

How many cushion cylinders does a press typically use?<\/h3>\n

Drawing presses typically use 4\u20138 cushion cylinders arranged symmetrically under the blank holder to distribute the cushion force evenly across the sheet. Forging presses may use 2\u20134 shock absorber cylinders under the lower die. The number and arrangement depend on the die size and the force distribution requirement. Multiple smaller cylinders provide more uniform force distribution than fewer larger ones \u2014 the same principle that applies to multi-cylinder lifting systems<\/a> and dual-cylinder hoist configurations<\/a>.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

Related Categories<\/h2>\n
\n <\/p>\n
\n
\"Telescopic\"<\/div>\n
\n
Telescopic Hydraulic Cylinders \u2192<\/div>\n
Dump truck, trailer, hoist.<\/div>\n<\/div>\n<\/div>\n

<\/a>
\n <\/p>\n

\n
\"Forklift\"<\/div>\n
\n
Forklift Hydraulic Cylinders \u2192<\/div>\n
Lift, tilt, steer \u2014 OEM.<\/div>\n<\/div>\n<\/div>\n

<\/a>
\n <\/p>\n

\n
\"AWV\"<\/div>\n
\n
Aerial Work Vehicle Cylinders \u2192<\/div>\n
Scissor, boom, platforms.<\/div>\n<\/div>\n<\/div>\n

<\/a>\n <\/div>\n<\/section>\n

<\/main><\/p>","protected":false},"excerpt":{"rendered":"

Hydraulic press cushion cylinder \u2014 the controlled-resistance actuator that absorbs forging displacement and shock vibration, and provides the blank holder force for deep-drawing operations. Every other cylinder on the press creates motion. The cushion cylinder resists it \u2014 pushing back against the ram with a precisely controlled counter-force that shapes how the material flows during forming. Too little cushion force and the sheet wrinkles. Too much and it tears. The cushion cylinder lives in that narrow window. Bore 75\u2013300 mm, rod 50\u2013180 mm, stroke \u2264500 mm, thrust up to 1,130 KN at 25 MPa. Korea Ever-Power. ISO 9001. OEM & ODM.<\/div>","protected":false},"featured_media":2381,"comment_status":"closed","ping_status":"open","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[852],"product_tag":[],"class_list":["post-2380","product","type-product","status-publish","has-post-thumbnail","product_cat-industrial-engineering-hydraulic-cylinders","pa_editor-cxm","first","instock","product-type-simple"],"_links":{"self":[{"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/product\/2380","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/comments?post=2380"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/media\/2381"}],"wp:attachment":[{"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/media?parent=2380"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/product_brand?post=2380"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/product_cat?post=2380"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/product_tag?post=2380"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}