{"id":2378,"date":"2026-06-30T08:59:01","date_gmt":"2026-06-30T08:59:01","guid":{"rendered":"https:\/\/hydrauliccylindersprice.com\/product\/hydraulic-press-centering-cylinder\/"},"modified":"2026-06-30T08:59:04","modified_gmt":"2026-06-30T08:59:04","slug":"hydraulic-press-centering-cylinder","status":"publish","type":"product","link":"https:\/\/hydrauliccylindersprice.com\/el\/product\/hydraulic-press-centering-cylinder\/","title":{"rendered":"Hydraulic Press Centering Cylinder"},"content":{"rendered":"

<\/p>\n

<\/p>\n

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

The Smallest Cylinder.
The First Thing That
Must Be Right.<\/h2>\n

The master cylinder delivers 80 MN. The clamping cylinder grips with 9,621 KN. The centering cylinder produces just 441 KN \u2014 the lowest thrust of any press cylinder. But if this cylinder fails, the billet is gripped off-centre, forged off-centre, and every dimension on the finished part shifts with it. Alignment is not optional.<\/em><\/p>\n

\n
\n
441 KN<\/div>\n
Max Thrust<\/div>\n<\/div>\n
\n
50\u2013190mm<\/span><\/div>\n
Bore Range<\/div>\n<\/div>\n
\n
\u22641,200mm<\/span><\/div>\n
Stroke<\/div>\n<\/div>\n
\n
Align<\/div>\n
Centre Before Grip<\/div>\n<\/div><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

What “Centering” Means \u2014 And Why It Comes First<\/h2>\n

Before the clamping cylinder can grip a billet, the manipulator’s clamp head must be centred \u2014 returned to its neutral, mid-stroke position so the jaws open symmetrically around the billet axis. If the clamp head has drifted left, right, up, or down from its previous forging operation, gripping from that off-centre position locks the billet into an asymmetric hold. Every subsequent forging pass inherits that initial offset.<\/p>\n

The centering cylinder acts before the clamping cylinder \u2014 it pushes the clamp head to the mechanical centre of its travel range, then holds it there while the clamping jaws close around the billet. Once the billet is gripped and the clamping cylinder is at full pressure, the centering cylinder’s job is done until the next billet changeover. Korea Ever-Power manufactures centering cylinders as part of the industrial engineering hydraulic cylinder<\/a> programme for manipulator builders.<\/p>\n

\"Hydraulic
\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 Centering Cylinder<\/td>\n<\/tr>\n
Function<\/td>\nCentre the clamp head to its neutral position<\/td>\n<\/tr>\n
Bore Diameter<\/td>\n50 mm \u2013 190 mm<\/td>\n<\/tr>\n
Rod Diameter<\/td>\n35 mm \u2013 150 mm<\/td>\n<\/tr>\n
Stroke<\/td>\n\u2264 1,200 mm<\/td>\n<\/tr>\n
Maximum Thrust<\/td>\n441 KN (bore 190 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

10 mm Off-Centre \u2192 Every Downstream Dimension Shifts<\/h2>\n

A centering error is not a single defect \u2014 it is a propagating error that distorts every forging operation in the sequence. Here is how 10 mm of clamp head offset cascades through the process:<\/p>\n

\n
\n
\n
1<\/div>\n
<\/div>\n<\/div>\n
Clamp head 10 mm off-centre<\/strong><\/p>\n

The clamping cylinder grips the billet. The billet axis is now 10 mm from the manipulator’s rotation axis.<\/p>\n<\/div><\/div>\n

\n
\n
2<\/div>\n
<\/div>\n<\/div>\n
Billet presented 10 mm off-centre to the die<\/strong><\/p>\n

When the manipulator positions the billet under the ram, the billet centre is 10 mm from the die centre. One side of the billet receives more forming force than the other.<\/p>\n<\/div><\/div>\n

\n
\n
3<\/div>\n
<\/div>\n<\/div>\n
Asymmetric material flow during forging<\/strong><\/p>\n

The off-centre contact produces uneven deformation \u2014 thicker on one side, thinner on the other. On a multi-pass forging, this asymmetry compounds with each stroke.<\/p>\n<\/div><\/div>\n

\n
\n
4<\/div>\n
<\/div>\n<\/div>\n
Manipulator rotation amplifies the offset<\/strong><\/p>\n

When the manipulator rotates the billet 90\u00b0 for the next forging pass, the 10 mm offset rotates too \u2014 now in a different axis. The forging error shifts from left-right to front-back, creating a complex, three-dimensional shape deviation.<\/p>\n<\/div><\/div>\n

\n
\n
5<\/div>\n<\/div>\n
Finished forging rejected or requires extra machining<\/strong><\/p>\n

The final forging has asymmetric dimensions that may exceed tolerance. If the machining allowance can absorb the offset, the part is salvaged at the cost of extra metal removal. If not, the forging is scrapped. Either way, the root cause was a 10 mm centering error \u2014 correctable by a 441 KN cylinder.<\/p>\n<\/div><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

How Centering Works Mechanically<\/h2>\n
\n \"Centering<\/p>\n

The centering cylinder is typically a double-acting cylinder mounted on the manipulator frame, connected to the clamp head carriage via a direct rod connection or a lever linkage. When both ports are pressurised equally (or a dedicated centering valve is activated), the cylinder pushes the clamp head to a mechanical mid-stroke position \u2014 defined by equal oil volume on both sides of the piston, or by a mechanical stop at the centre of travel.<\/p>\n

The centering force (up to 441 KN) needs only to overcome the friction and inertia of the clamp head carriage \u2014 not to resist forging forces. Once centred, the clamp head is held in position by the centering cylinder’s hydraulic lock while the clamping cylinder grips the billet. After gripping, the billet’s position is fixed by the clamping force, and the centering cylinder can be depressurised without affecting the billet alignment.<\/p>\n

On manipulators that handle multiple billet sizes, the centering cylinder can also function as a jaw-width adjustment actuator \u2014 positioning the clamp head at a specific offset (not centre) to accommodate billets of different diameters. This dual-purpose capability eliminates the need for a separate adjustment cylinder on some manipulator designs.<\/p>\n<\/p><\/div>\n

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

<\/p>\n

\n
\n

Perspective \u2014 The Smallest Cylinder in a System of Giants<\/h2>\n

The centering cylinder is the smallest actuator on the manipulator and in the entire press cylinder system. But its output \u2014 precise billet alignment \u2014 feeds directly into the quality of every downstream operation. Here is how it compares to its neighbours:<\/p>\n

\n\n\n\n\n\n\n\n\n
Cylinder<\/th>\nMax Force<\/th>\nBore Range<\/th>\nRole<\/th>\n<\/tr>\n<\/thead>\n
Master<\/td>\n80,000 KN<\/td>\n500\u20131800 mm<\/td>\nPrimary press force<\/td>\n<\/tr>\n
Clamping<\/td>\n9,621 KN<\/td>\n125\u2013700 mm<\/td>\nGrip the billet<\/td>\n<\/tr>\n
Tilt<\/td>\n3,141 KN<\/td>\n100\u2013400 mm<\/td>\nRotate the billet<\/td>\n<\/tr>\n
Centering<\/td>\n441 KN<\/td>\n50\u2013190 mm<\/td>\nAlign before gripping<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n

The centering cylinder’s 441 KN is 0.55% of the master cylinder’s 80 MN \u2014 but a centering error propagates through every single press stroke that the 80 MN master delivers. The cost-to-impact ratio of the centering cylinder is the highest of any actuator in the system. Contact the hydraulic cylinder engineering team<\/a> for manipulator cylinder sets.<\/p>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n \"Centering
\n<\/section>\n

<\/p>\n

\n

Manufacturing \u2014 Small Cylinder, Same Precision<\/h2>\n
\n \"Korea<\/p>\n

The centering cylinder is physically smaller than the clamping, tilt, or return cylinder \u2014 but the machining precision is identical. The bore is honed to the same Ra 0.2\u20130.4 \u00b5m finish, the rod is chrome plated to the same thickness and ground to the same surface standard, and the seal grooves are machined to the same tolerances. A centering cylinder that sticks, chatters, or creeps at low speed defeats its purpose \u2014 the clamp head must move smoothly and stop precisely at the centre position.<\/p>\n

Because the centering cylinder is mounted on the manipulator arm \u2014 in the same harsh forging environment as the tilt and clamping cylinders \u2014 it receives the same environmental protection: high-temperature seals (FKM), heavy-duty wiper seals to exclude scale, and chrome plating thickness appropriate for forge-spray exposure. Korea Ever-Power manufactures centering cylinders as part of the manipulator cylinder set, alongside the clamping and tilt cylinders, using the same batch of materials and seals for consistency.<\/p>\n

Every centering cylinder is hydrostatic tested at 1.5\u00d7 working pressure. For position-critical applications, the cylinder is also tested for mid-stroke positioning accuracy \u2014 verifying that the centring position is repeatable within \u00b11 mm across multiple cycles.<\/p>\n<\/p><\/div>\n

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

<\/p>\n

\n

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

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

Clamp head carriage weight and friction characteristics, centering stroke (total travel of clamp head), centering accuracy requirement (\u00b1mm), mounting position and rod connection detail, whether the cylinder also serves as a jaw-width adjuster (dual-function), and the manipulator clamp head drawing. Ideally ordered as a set with the clamping and tilt cylinders for the same manipulator.<\/p>\n<\/div><\/div>\n

\n
\n

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

Engineering drawing with bore, rod, stroke, centering force, and positioning repeatability specification. Manufactured as part of the manipulator cylinder set. 100% hydrostatic test + positioning test. Seal kits for forge-environment maintenance schedule. Browse all industrial manipulator and press cylinders<\/a>.<\/p>\n<\/div><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

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

Does the centering cylinder stay pressurised during forging?<\/h3>\n

Not necessarily. Once the clamping cylinder grips the billet, the billet position is locked by the clamping force. The centering cylinder can be depressurised at that point. However, on some manipulator designs, the centering cylinder remains pressurised as a secondary position lock \u2014 providing redundant centring in case the billet slips slightly in the clamp jaws during a heavy press stroke.<\/p>\n<\/p><\/div>\n

\n

Can the centering cylinder handle different billet sizes without manual adjustment?<\/h3>\n

Yes \u2014 when equipped with a proportional valve and position feedback (linear transducer), the centering cylinder can position the clamp head at any point within its stroke range. The press control system stores preset positions for each billet size. When the operator selects the next billet programme, the centering cylinder automatically moves to the corresponding position \u2014 no manual adjustment needed.<\/p>\n<\/p><\/div>\n

\n

Is the centering cylinder always on the manipulator, or can it be on the press itself?<\/h3>\n

On forging presses, the centering cylinder is on the manipulator \u2014 aligning the clamp head before gripping. On some stamping presses, a centering function is built into the die set \u2014 using small cylinders or spring-loaded pins to align the sheet blank within the die before the press stroke. Both serve the same purpose (workpiece alignment before forming) but at different scales. The manipulator centering cylinder is an industrial engineering hydraulic cylinder<\/a>; the stamping-die version is typically a simpler, smaller actuator integrated into the press tooling package<\/a>. Similar alignment principles apply in forklift fork positioning<\/a> and telescopic stage alignment<\/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 centering cylinder \u2014 the alignment actuator that pushes the manipulator clamp head to its neutral centre position before the billet is gripped. It is the smallest cylinder in the press cylinder family \u2014 bore 50\u2013190 mm, thrust just 441 KN \u2014 but its contribution to forging quality is disproportionately large. A clamp head that grips a billet 10 mm off-centre presents that billet 10 mm off-centre to the die on every press stroke, every rotation, every forging pass. The centering cylinder eliminates this error at the source. Stroke \u22641,200 mm. 25 MPa. Korea Ever-Power. ISO 9001. OEM & ODM.<\/div>","protected":false},"featured_media":2379,"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-2378","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\/el\/wp-json\/wp\/v2\/product\/2378","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/comments?post=2378"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/media\/2379"}],"wp:attachment":[{"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/media?parent=2378"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/product_brand?post=2378"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/product_cat?post=2378"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/el\/wp-json\/wp\/v2\/product_tag?post=2378"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}