{"id":705,"date":"2026-06-01T05:26:10","date_gmt":"2026-06-01T05:26:10","guid":{"rendered":"https:\/\/planetary-gearboxes.com\/?p=705"},"modified":"2026-06-01T05:26:10","modified_gmt":"2026-06-01T05:26:10","slug":"planetary-gearbox-injection-molding-machine-servo-drive","status":"publish","type":"post","link":"https:\/\/planetary-gearboxes.com\/fr\/planetary-gearbox-injection-molding-machine-servo-drive\/","title":{"rendered":"R\u00e9ducteur plan\u00e9taire pour machines de moulage par injection"},"content":{"rendered":"
<\/p>\n
\"planetary<\/p>\n
\n
Application Guide \u00b7 Injection \/ Clamp \/ Screw \/ Ejector \u00b7 Five-Axis Selection<\/div>\n

Planetary Gearbox for Injection Molding Machines \u2014
\nFive Servo Axes, Five Different Specifications<\/h1>\n

Selecting the right planetary gearbox injection molding axis configuration is the decision that separates reliable all-electric machines from ones that fail bearings every 14 months. A fully electric Korean injection molding machine has five servo-driven axes \u2014 injection, screw rotation, clamp, ejector, and rotary table \u2014 each with a completely different torque profile, speed range, and backlash requirement<\/strong>. Applying the same gearbox specification across all five axes either over-specifies three of them (wasting \u20a9800,000\u20132,000,000 per machine) or under-specifies the one that matters most and produces premature bearing failure within the first million cycles.<\/p>\n

View EP-AF High-Rigidity Series \u2192
\n<\/a><\/p>\n<\/div>\n<\/section>\n

<\/p>\n

\n

Korean Injection Molding \u2014 Why the Drive System Is the Machine’s Critical Path<\/h2>\n

The planetary gearbox injection molding machine selection problem is uniquely Korean in its scale and consequence. Korea is one of the world’s largest producers of plastic injection-molded components \u2014 automotive interior parts, electronic enclosures, medical device housings, and packaging materials for the consumer goods sector. Korean injection molding machine (IMM) manufacturers and the Korean factories that operate Japanese and European IMMs both face the same fundamental machine economics: cycle time is revenue, and cycle time is governed by the servo drive system.<\/p>\n

The transition from hydraulic to all-electric injection molding machines \u2014 which Korea has adopted faster than most markets, driven by the energy cost consciousness of Korean manufacturing \u2014 places the servo gearbox at the centre of machine performance. In a hydraulic IMM, a single hydraulic pump serves all functions sequentially. In an all-electric IMM, each axis has a dedicated servo motor and gearbox, and all axes can operate simultaneously \u2014 the clamp can be closing while the screw is plasticising material for the next shot. This parallel operation multiplies throughput but also multiplies the number of gearbox selection decisions on every machine BOM.<\/p>\n

Korean all-electric IMM manufacturers \u2014 including those supplying to the domestic automotive sector (Hyundai, Kia, Samsung SDI battery cell holders) and the electronics sector (LG Electronics housing components) \u2014 typically specify 5\u20138 servo axes per machine. With machine volumes of 200\u20132,000 units per year per major Korean OEM, gearbox specification decisions have significant BOM and quality impact.<\/p>\n<\/section>\n

\"Application<\/p>\n

\n

Five Servo Axes \u2014 Why Each Requires a Different Gearbox Specification<\/h2>\n

The fundamental error in planetary gearbox injection molding specification is treating the five servo axes as equivalent servo drives that need the same gearbox. They are not. Each axis has a unique combination of peak torque, continuous torque, speed, backlash sensitivity, radial load, and thermal duty cycle that points to a different series and frame.<\/p>\n

\n\n\n\n\n\n\n\n\n\n
Axis<\/th>\nOutput Speed<\/th>\nPeak \/ Cont. Torque<\/th>\nBacklash Need<\/th>\nPrimary Constraint<\/th>\nLa Cor\u00e9e toujours puissante<\/th>\n<\/tr>\n<\/thead>\n
\u2460 Injection axis<\/td>\n10\u2013200 mm\/s linear<\/td>\n3\u20138\u00d7 \/ 1.0\u00d7<\/td>\nP1 (shot weight)<\/td>\nPeak torque + axial load<\/td>\nEP-AF P1<\/a> (high axial)<\/td>\n<\/tr>\n
\u2461 Screw rotation<\/td>\n5\u2013200 rpm<\/td>\n1.5\u00d7 \/ 0.8\u00d7<\/td>\nP2 (speed only)<\/td>\nContinuous torque \u00d7 hours<\/td>\nEP-AB P2<\/a> or EP-BPG<\/td>\n<\/tr>\n
\u2462 Clamp (toggle)<\/td>\n50\u2013300 mm\/s linear<\/td>\n2\u00d7 \/ 0.6\u00d7<\/td>\nP1\u2013P2 (position)<\/td>\nCycle count \u00d7 impact<\/td>\nEP-AB P1<\/a><\/td>\n<\/tr>\n
\u2463 Ejector<\/td>\n20\u2013150 mm\/s linear<\/td>\n2.5\u00d7 \/ 0.5\u00d7<\/td>\nP2 (position only)<\/td>\nCompact, moderate torque<\/td>\nEP-AB P2 (smaller frame)<\/td>\n<\/tr>\n
\u2464 Rotary table<\/td>\n1\u201330 rpm index<\/td>\n1.5\u00d7 \/ 0.7\u00d7<\/td>\nP0 (part precision)<\/td>\nIndex accuracy<\/td>\nEP-AFH<\/a> or EP-AB P0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

The table makes the over-specification cost immediately visible. If a Korean IMM designer specifies EP-AFH (\u22641 arcmin standard, highest precision) on all five axes because it is a simple, safe default, they are paying the premium on axes \u2461\u2462\u2463 where P1 or P2 is fully adequate. Correct axis-by-axis specification delivers equivalent machine performance at significantly lower gearbox BOM cost.<\/p>\n<\/section>\n

<\/p>\n

\n

Injection Axis \u2014 Peak Torque Ratio and the Axial Load from Melt Back-Pressure<\/h2>\n

The injection axis drives a ball screw that converts servo rotary motion to the linear force that pushes the injection screw (plunger) forward, injecting molten plastic into the mould cavity at high pressure (typically 800\u20132,500 bar melt pressure). This is the highest peak torque axis in the machine \u2014 and it is the axis most commonly under-specified by Korean IMM designers who size on continuous torque rather than peak.<\/p>\n

\n
\n

The peak torque profile of the injection axis<\/strong> differs from all other machine servo axes: during the filling phase, the servo motor delivers continuous torque to maintain injection velocity against rising melt pressure. At the transition from filling to packing (the “cushion” point), the servo must instantaneously provide 3\u20135\u00d7 the filling torque to compress the melt against the closed mould face. This peak is brief (50\u2013200 ms) but occurs on every shot \u2014 at 8 seconds cycle time and 6,000 hours per year, it occurs approximately 2.7 million times per year.<\/p>\n

\n

INJECTION AXIS \u2014 BACK-PRESSURE AXIAL FORCE<\/p>\n

During screw retraction (plasticising phase):
\nMelt back-pressure acts on screw face areaF_axial = P_back \u00d7 A_screw
\nP_back = back-pressure setting (MPa, typically 5\u201330 MPa)
\nA_screw = screw cross-section area (mm\u00b2)<\/p>\n

Example: \u00d850 mm screw, P_back = 15 MPa:
\nA_screw = \u03c0 \u00d7 25\u00b2 = 1,963 mm\u00b2
\nF_axial = 15 \u00d7 1,963 = 29,450 N (\u22483 tonnes)<\/span><\/p>\n

This axial force acts on the injection axis gearbox
\noutput shaft during the entire plasticising phase
\n(typically 2\u20134 sec per cycle).<\/p>\n

At 2.7M cycles\/yr \u2192 5.4M\u201310.8M sec\/yr
\nof sustained axial loading on output bearing.<\/p>\n<\/div>\n<\/div>\n

The axial force from melt back-pressure is the specification item most frequently omitted in injection axis gearbox selection. Korean IMM designers who select the injection axis gearbox on output torque alone \u2014 which is correct for the rotary drive \u2014 miss the axial bearing load entirely. The Korea Ever-Power EP-AF high-rigidity series is the standard recommendation for injection axis drives precisely because its enlarged output shaft and upgraded bearing arrangement provides substantially higher axial load capacity at the same frame size and torque rating as EP-AB.<\/p>\n

Korean automotive IMM case \u2014 polypropylene bumper component: <\/strong>
\nA 500T Korean IMM producing PP automotive bumper sub-components had repeated injection axis gearbox bearing failures at 14\u201318 months. The original specification (EP-AB140 P1) met the torque requirement but ignored the \u00d860mm screw back-pressure axial force of approximately 42,000 N. Switching to EP-AF140 (same frame, 2.3\u00d7 higher axial capacity) resolved bearing failures completely \u2014 28 months continuous operation at the time of this writing with no bearing issues.<\/span><\/div>\n<\/div>\n
\n

\"Korea<\/p>\n

\n
Injection axis specification checklist<\/div>\n
\u2713 Cont. torque from filling velocity
\n\u2713 Peak torque at packing (3\u20135\u00d7 cont.)
\n\u2713 Axial force from back-pressure
\n\u2713 Cycles\/year \u00d7 peak torque duration
\n\u2713 Specify EP-AF (not EP-AB) for axial capacity
\n\u2713 Backlash P1 adequate (shot weight, not CNC precision)<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n

Screw Rotation Axis \u2014 The Highest Thermal Duty Cycle in the Machine<\/h2>\n

The screw rotation axis drives the injection screw in rotation to plasticise (melt) the polymer resin during the recovery phase of each cycle. Unlike the injection axis \u2014 which operates at high torque for a brief burst \u2014 the screw rotation axis operates at moderate torque for the entire recovery period, which may represent 40\u201370% of the total cycle time in efficient moulding.<\/p>\n

This continuous moderate-torque operation makes the screw rotation axis the highest thermal duty cycle drive on the machine. At 60% of cycle time in continuous three-shift Korean production (6,300 hours per year), the screw drive gearbox accumulates approximately 3,780 operating hours per year \u2014 comparable to a high-cycle conveyor drive rather than an intermittent servo axis. The temperature correction from Module 3 of Art15 applies directly: at elevated Korean summer ambient in a plastics factory, the screw drive gearbox housing temperature can reach 75\u201385\u00b0C, reducing grease life below the 20,000-hour catalogue rating.<\/p>\n

Backlash grade on the screw rotation axis is genuinely irrelevant \u2014 the axis controls screw rotational speed, not position. The screw back-drives slightly at each shot (axially, not rotationally) but the rotation axis gearbox sees only the torque from material shear and the screw’s flight helix resistance. P2 (\u22645 arcmin) is the correct specification; the additional cost of P0 or P1 on this axis provides zero functional benefit.<\/p>\n

Why EP-BPG is an excellent choice for screw rotation: <\/strong>
\nLe EP-BPG energy-saving series<\/a> (\u226597% efficiency, IEC worm-replacement flange) is a strong candidate for the screw rotation axis when the machine uses an induction motor for screw drive \u2014 common on Korean medium-size IMMs where only the injection and clamp axes are servo-controlled. The BPG’s IEC-standard flange fits the motor without adapter, the sealed grease construction handles the continuous thermal duty, and P2 backlash is standard. For fully electric machines where the screw drive uses a servo motor, EP-AB P2 at the appropriate frame provides the same thermal capability with the servo motor adapter interface.<\/span><\/div>\n<\/section>\n

<\/p>\n

\n

Clamp Axis \u2014 Billion-Cycle Life Requirement and Toggle Impact Load<\/h2>\n

The clamp axis closes and opens the mould on every cycle. For a Korean IMM running at 8-second cycle time in three-shift continuous operation, the clamp axis completes approximately 2.7 million open-close cycles per year. Over a Korean IMM’s expected 15-year service life, this accumulates to approximately 40 million clamp cycles \u2014 each one a full-stroke motion from mould-open to mould-closed and back.<\/p>\n

Most Korean IMMs use a toggle mechanism for the clamp axis \u2014 a linkage that amplifies the servo motor force to achieve the required clamp force (typically 100\u20135,000 kN for Korean production machines). The toggle produces a characteristic velocity profile: slow at mould-open and near close (for mould protection), fast through mid-stroke, and a sudden deceleration at full-clamp lock. This deceleration creates a brief impact load on the gearbox output \u2014 a torque spike at the end of each clamp stroke that can reach 2\u20132.5\u00d7 the continuous rated torque.<\/p>\n

The gearbox design life calculation for the clamp axis must account for this peak torque cycle count. Using the L10 bearing life formula from Art16 with the actual equivalent dynamic load (a weighted combination of peak and continuous torque contributions over the cycle) rather than just the continuous torque produces a more accurate service life prediction \u2014 and typically shows that the EP-AB P1 specification is adequate for standard Korean IMM clamp applications, while heavy-clamp high-speed machines may warrant EP-AF P1 for the additional bearing load capacity.<\/p>\n

\n

CLAMP AXIS \u2014 EQUIVALENT DYNAMIC LOAD OVER CYCLE<\/p>\n

Cycle breakdown (8 sec cycle):
\nFast traverse (3 sec): T_cont = 120 N\u00b7m
\nDeceleration (0.3 sec): T_peak = 280 N\u00b7m (2.3\u00d7 cont.)
\nClamp dwell (3 sec): T_hold = 30 N\u00b7m
\nOpen stroke (1.7 sec): T_cont = 100 N\u00b7mEquivalent dynamic torque (L10 weighted):
\nT_eq = [(T\u2081\u00b3\u00d7t\u2081 + T\u2082\u00b3\u00d7t\u2082 + …) \/ t_total]^(1\/3)
\nT_eq = [(120\u00b3\u00d73 + 280\u00b3\u00d70.3 + 30\u00b3\u00d73 + 100\u00b3\u00d71.7) \/ 8]^(1\/3)
\nT_eq = [(5.18M + 65.9M + 0.081M + 1.70M) \/ 8]^(1\/3)
\nT_eq = [9.11M]^(1\/3) = 208 N\u00b7m<\/span><\/p>\n

vs peak-selected T = 280 N\u00b7m (34% over-spec if using peak)
\nvs cont-selected T = 120 N\u00b7m (42% under-spec if using cont. only)<\/p>\n<\/div>\n<\/div>\n

This calculation is the correct basis for clamp axis gearbox selection. Using only the peak torque (280 N\u00b7m) oversizes the gearbox by 34%; using only the continuous torque (120 N\u00b7m) undersizes it by 42%. The equivalent dynamic load method, which is standard in the Korea Ever-Power EP application engineering process, correctly identifies 208 N\u00b7m as the effective selection torque.<\/p>\n<\/section>\n

<\/p>\n

\n

Rotary Table and Insert Station \u2014 Where Precision Actually Matters<\/h2>\n
\n
\n

Korean IMMs producing multi-component parts \u2014 overmoulded connectors, insert-moulded metal components, two-colour cosmetic parts \u2014 use a rotary table or index plate that rotates the mould between injection stations. The rotary table is the one axis in the injection molding machine where backlash genuinely matters for part quality.<\/p>\n

The indexing accuracy requirement comes from the part geometry: for a two-colour injection part, the second-colour gate must land within \u00b10.3\u20130.5 mm of the first-colour feature edge. At a typical rotary table radius of 200\u2013400 mm, this translates to a required index accuracy of:<\/p>\n

Required: \u0394x \u2264 0.3 mm at r = 300 mm
\n\u03b8_max = \u0394x\/r = 0.3\/300 = 0.001 rad = 3.4 arcmin
\nGearbox budget (40% of total): 1.4 arcmin\u2192 P0 (\u22641′) adequate with margin
\n\u2192 EP-AFH (\u22641′ standard) eliminates grade selection step
\n\u2192 P1 (\u22643′) marginal \u2014 worst case may exceed budget<\/p>\n<\/div>\n

The EP-AFH ultra-precision series is the standard specification for Korean IMM rotary table drives. Its \u22641 arcmin standard (no grade code, no unit-to-unit variation within a grade band) provides the accuracy margin that P1 cannot reliably deliver on every production unit. The non-standard ratios available in EP-AFH (i=3 to i=100 in single stage) accommodate the carousel geometry without requiring a non-standard ratio order that would extend lead time.<\/p>\n

For Korean IMMs producing insert-moulded automotive connectors, including compact staging mechanisms using EP-ADS compact series<\/a> for tight-space index drives where the metal insert must align with a \u00b10.1 mm tolerance in the mould cavity, P0 is mandatory regardless of the rotary table radius \u2014 the insert position error adds directly to the final part dimensional tolerance and cannot be corrected downstream.<\/p>\n<\/div>\n

\n

\"Planerary<\/p>\n

\n
Two-colour \/ insert moulding rotary axis:<\/div>\n
Two-colour part: \u22640.3mm \u2192 P0 \u2713
\nInsert moulding: \u22640.1mm \u2192 P0 mandatory
\nSingle-colour index: \u22641.0mm \u2192 P1 OKEP-AFH: \u22641′ standard \u2192 all cases \u2713
\n(no grade selection needed)<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n

Injection Molding Cycle Life \u2014 Why the Peak Torque Multiple Is the Critical Selection Criterion<\/h2>\n

Injection molding machines accumulate cycle counts that no other Korean industrial machine approaches. A Korean food packaging IMM running at 8-second cycles in three-shift continuous operation completes approximately 2.7 million cycles per year. Over a 15-year machine life, this is 40 million cycles. For the gearboxes on the injection and clamp axes \u2014 which both experience a peak torque event on every cycle \u2014 the cumulative peak torque event count is the dominant fatigue life driver.<\/p>\n

Korea Ever-Power EP series gearboxes are rated with both a nominal rated torque (for continuous operation) and a peak torque rating (typically 2\u20133\u00d7 the rated torque, for brief events not exceeding a defined duration and count per hour). For injection molding applications, the relevant question is whether the peak torque events \u2014 each lasting 50\u2013300 ms at 2\u20133\u00d7 rated torque \u2014 accumulate fatigue damage in the gear teeth at a rate that limits service life below the catalogue value.<\/p>\n

\n
Peak Torque Events \u2014 IMM vs Catalogue Assumptions<\/div>\n
\n\n\n\n\n\n\n\n\n
Param\u00e8tre<\/th>\nCatalogue Assumption<\/th>\nKorean IMM Reality<\/th>\nVerdict<\/th>\n<\/tr>\n<\/thead>\n
Peak events per hour<\/td>\n\u22641,000\/hr<\/td>\n450\/hr (8s cycle)<\/td>\n\u2713 Within catalogue<\/td>\n<\/tr>\n
Peak torque multiple<\/td>\n\u22643\u00d7 rated<\/td>\n2.3\u20134\u00d7 rated<\/td>\n\u26a0 Confirm per machine<\/td>\n<\/tr>\n
Peak duration per event<\/td>\n\u2264200 ms<\/td>\n50\u2013300 ms<\/td>\n\u2713 Within catalogue<\/td>\n<\/tr>\n
Annual peak count<\/td>\n~1M\/yr<\/td>\n2.7M\/yr<\/td>\nConfirm cycle life basis<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

The peak torque multiple is the most critical parameter to confirm. If packing-phase injection force results in a torque multiple above 3\u00d7, Korea Ever-Power application engineering recalculates service life using the actual peak\/continuous ratio for your specific machine specification.<\/p>\n<\/div>\n<\/section>\n

<\/p>\n

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Optimised IMM Gearbox BOM \u2014 Cost Comparison: Default vs Axis-Specific Specification<\/h2>\n

The following BOM comparison illustrates the cost impact of correct axis-by-axis specification vs the common Korean OEM default of specifying identical gearboxes across all servo axes. This example uses a 200T Korean all-electric IMM with five servo axes.<\/p>\n

\"R\u00e9ducteurs<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n
Axis<\/th>\nDefault spec (EP-AFH \u00d7 5)<\/th>\nOptimised spec<\/th>\nCost saving \/ axis<\/th>\n<\/tr>\n<\/thead>\n
\u2460 Injection<\/td>\nEP-AFH 140 \u22641′ (axial NG)<\/td>\nEP-AF140 P1<\/a> (high axial \u2713)<\/td>\n+\u20a9120,000 (correct spec)<\/td>\n<\/tr>\n
\u2461 Screw rotation<\/td>\nEP-AFH 090 \u22641′ (over-spec)<\/td>\nEP-BPG P2<\/a> (thermal duty \u2713)<\/td>\n\u2212\u20a9480,000 saved<\/td>\n<\/tr>\n
\u2462 Clamp<\/td>\nEP-AFH 115 \u22641′ (over-spec)<\/td>\nEP-AB115 P1<\/a> (equivalent dynamic \u2713)<\/td>\n\u2212\u20a9360,000 saved<\/td>\n<\/tr>\n
\u2463 Ejector<\/td>\nEP-AFH 060 \u22641′ (over-spec)<\/td>\nEP-AB060 P2 (compact \u2713)<\/td>\n\u2212\u20a9280,000 saved<\/td>\n<\/tr>\n
\u2464 Rotary table<\/td>\nEP-AFH 090 \u22641′ \u2713 (correct)<\/td>\nEP-AFH 090<\/a> \u22641′ (same, correct)<\/td>\nNo change<\/td>\n<\/tr>\n
Net BOM saving per machine (optimised vs all-AFH default)<\/td>\n\u2212\u20a91,000,000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
Volume impact for Korean IMM OEMs: <\/strong>
\nA Korean IMM manufacturer producing 300 machines per year at \u20a91,000,000 BOM saving per machine through correct axis-by-axis gearbox specification realises \u20a9300,000,000 per year in component cost reduction \u2014 while simultaneously improving injection axis reliability by switching from EP-AFH (not rated for back-pressure axial load) to EP-AF (rated for it). Correct specification simultaneously reduces cost and improves reliability. This is the engineering case that Korea Ever-Power application engineers present to Korean IMM OEM procurement teams.<\/span><\/div>\n<\/section>\n

<\/p>\n

\n

Frequently Asked Questions \u2014 Planetary Gearbox for Injection Molding Machines<\/h2>\n
\n
\n

Q<\/span>
\nOur Korean IMM’s injection axis gearbox bearing fails every 14\u201318 months. The gearbox is sized correctly for torque. What are we missing?<\/h3>\n

If the torque specification is correct but the bearing fails prematurely, the almost certain cause is under-specification of the axial load from melt back-pressure. The injection axis output shaft transmits the back-pressure reaction force as an axial load on the output bearing throughout the plasticising phase \u2014 typically 2\u20134 seconds per cycle, every cycle. Measure your screw diameter and back-pressure setting, calculate F_axial = P_back \u00d7 A_screw (as shown in Module 3), and compare it to the output bearing axial capacity in the Korea Ever-Power datasheet for your installed gearbox model. In Korean automotive IMMs, this axial force is frequently 20,000\u201350,000 N \u2014 exceeding the EP-AB series axial capacity but well within the EP-AF’s upgraded specification. Switching to EP-AF at the same frame resolves the bearing failure without any other machine change.<\/p>\n<\/div>\n

\n

Q<\/span>
\nFor the clamp axis, does it matter whether the machine uses a toggle mechanism or a direct-drive clamp?<\/h3>\n

Yes \u2014 significantly. A toggle clamp produces the velocity and torque profile described in Module 5: the gearbox sees peak torque at the deceleration point as the toggle locks out, followed by a sustained low-torque hold. A direct-drive clamp (servo motor drives a ball screw directly to the moving platen without toggle linkage) produces a more uniform torque profile throughout the stroke, with the peak load being the clamp force divided by the ball screw lead \u2014 a more predictable and generally lower peak multiple than the toggle. For direct-drive clamps, the equivalent dynamic torque calculation typically yields a value closer to the continuous torque, and EP-AB P1 at a smaller frame may be adequate compared to the larger frame required for toggle clamp equivalent dynamic load. Confirm the clamp mechanism type before selecting the gearbox frame size.<\/p>\n<\/div>\n

\n

Q<\/span>
\nCan I connect the injection axis gearbox to the ball screw with a CV shaft to accommodate slight misalignment?<\/h3>\n

Yes \u2014 and this is increasingly common in Korean all-electric IMM designs where space constraints prevent perfect coaxial alignment between the servo gearbox and the ball screw. A precision CV drive shaft<\/a> transmits torque through the angular offset without transmitting the offset reaction force back to the gearbox output bearing \u2014 an important benefit on the injection axis where the output bearing is already loaded by the ball screw’s back-pressure axial reaction. If a rigid coupling is used instead, any misalignment between the gearbox and ball screw adds a bending moment to the gearbox output shaft that stacks on top of the back-pressure axial force. A CV shaft eliminates this stacking effect and simplifies alignment tolerance during machine assembly.<\/p>\n<\/div>\n

\n

Q<\/span>
\nKorean plastic injection parts are often produced in high-temperature environments near the machine barrel. Does ambient temperature affect gearbox specification?<\/h3>\n

Yes \u2014 Korean plastics manufacturing facilities have elevated ambient temperatures near injection moulding machines: the barrel heats the surrounding air to 35\u201350\u00b0C near the nozzle, and radiant heat from the mould adds further. Applying the grease life temperature correction from Art15 (Module 3): at 42\u00b0C ambient (near-barrel installation) and 35\u00b0C gearbox self-heating, the housing temperature may reach 77\u00b0C \u2014 reducing grease life from the 20,000-hour rated value to approximately 9,000 hours. In three-shift Korean IMM operation (6,300 h\/yr), this means replacement at 1.4 years rather than 3.2 years. Installing the gearbox away from the direct barrel heat zone (even 300 mm further from the barrel), adding a simple radiation shield, or routing cooling air past the gearbox housing are low-cost interventions that maintain housing temperature near the rated baseline and restore full catalogue service life. Korea Ever-Power application engineers include this thermal consideration in the service life estimate for all IMM axis gearbox specifications.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n

Specify Your IMM Gearbox BOM with Korea Ever-Power<\/h2>\n

Korea Ever-Power performs axis-by-axis torque calculation \u2014 including back-pressure axial load, equivalent dynamic clamp torque, and screw rotation thermal duty cycle \u2014 and provides an optimised five-axis gearbox BOM for Korean injection molding machines. Same working day, in Korean.<\/p>\n

EP-AF High-Rigidity (Injection Axis) \u2192
\n<\/a><\/div>\n<\/section>\n

\u00c9diteur : Cxm<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

Application Guide \u00b7 Injection \/ Clamp \/ Screw \/ Ejector \u00b7 Five-Axis Selection Planetary Gearbox for Injection Molding Machines \u2014 Five Servo Axes, Five Different Specifications Selecting the right planetary gearbox injection molding axis configuration is the decision that separates reliable all-electric machines from ones that fail bearings every 14 months. A fully electric Korean […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[965],"tags":[],"class_list":["post-705","post","type-post","status-publish","format-standard","hentry","category-application-and-technical-guid"],"_links":{"self":[{"href":"https:\/\/planetary-gearboxes.com\/fr\/wp-json\/wp\/v2\/posts\/705","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/planetary-gearboxes.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/planetary-gearboxes.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/fr\/wp-json\/wp\/v2\/comments?post=705"}],"version-history":[{"count":1,"href":"https:\/\/planetary-gearboxes.com\/fr\/wp-json\/wp\/v2\/posts\/705\/revisions"}],"predecessor-version":[{"id":706,"href":"https:\/\/planetary-gearboxes.com\/fr\/wp-json\/wp\/v2\/posts\/705\/revisions\/706"}],"wp:attachment":[{"href":"https:\/\/planetary-gearboxes.com\/fr\/wp-json\/wp\/v2\/media?parent=705"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/fr\/wp-json\/wp\/v2\/categories?post=705"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/fr\/wp-json\/wp\/v2\/tags?post=705"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}