{"id":19770,"date":"2025-12-16T16:11:12","date_gmt":"2025-12-16T15:11:12","guid":{"rendered":"https:\/\/www.darda.de\/?page_id=19770"},"modified":"2026-05-20T11:59:02","modified_gmt":"2026-05-20T09:59:02","slug":"thrust-force","status":"publish","type":"page","link":"https:\/\/www.darda.de\/en\/knowledge\/thrust-force","title":{"rendered":"Thrust force"},"content":{"rendered":"<div class=\"wissen-inhaltsbereich\">\n<p>Thrust force describes the rectilinear force with which a drive pushes components, separates materials, or advances wedges. In demolition, interior demolition, rock excavation, and natural stone extraction it is a key parameter because it directly determines how efficiently tools such as concrete demolition shears or <a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-rock-and-concrete-splitters\">rock and concrete splitters<\/a> operate. In hydraulic applications by Darda GmbH, thrust force is generated by pressure in cylinders, translated through lever mechanisms, and delivered as usable working force at cutting edges, jaws, or splitting wedges. As an engineering quantity it is typically specified in newtons or kilonewtons and is sometimes also referred to as feed force or clamping force in machine and tool engineering.<\/p>\n<h2>Definition: What is meant by thrust force?<\/h2>\n<p>Thrust force is the <em>axially directed compressive force<\/em> of a drive, usually a hydraulic cylinder. It acts as feed or clamping force in the direction of motion. It is distinct from tensile force (axially opposite), shear force (transverse to the surface), and bending forces. In hydraulic tools, thrust force typically arises from the product of hydraulic pressure and effective cylinder area. Through kinematics (levers, wedges, eccentrics), this cylinder force is transformed into splitting, cutting, or crushing forces as required by concrete demolition shears or rock and concrete splitters. In specification sheets, thrust force is commonly paired with a stroke range and a permissible operating pressure to describe usable performance across the working cycle.<\/p>\n<h2>Calculating thrust force in hydraulic systems<\/h2>\n<p>The theoretical thrust force <strong>F<\/strong> of a hydraulic cylinder is ideally given by <strong>F = p \u00d7 A<\/strong>. Here <strong>p<\/strong> is the hydraulic pressure and <strong>A<\/strong> is the piston area (during the pressure stroke), while for the retraction stroke the rod cross-sectional area is subtracted. For practical values, efficiencies <strong>\u03b7<\/strong> for friction, seals, and kinematics are considered: <strong>F_eff \u2248 p \u00d7 A \u00d7 \u03b7<\/strong>. Beyond the static force balance, the interplay of pressure, flow rate, and mechanical advantage determines the dynamic behavior of the tool under load.<\/p>\n<h3>Influencing factors<\/h3>\n<ul>\n<li><strong>Hydraulic pressure p:<\/strong> Pressure level of the hydraulic power pack; high-pressure systems use up to several hundred bar.<\/li>\n<li><strong>Piston diameter and rod diameter:<\/strong> Larger area means more thrust force; during the return stroke the rod reduces the effective area.<\/li>\n<li><strong>Tool kinematics:<\/strong> Lever arms, wedge angles, and pivot points determine how the cylinder force is translated into cutting or splitting force.<\/li>\n<li><strong>Friction and losses:<\/strong> Seals, guides, and joints reduce the effective force; regular maintenance keeps \u03b7 high.<\/li>\n<li><strong>Hydraulic oil temperature and viscosity:<\/strong> Influence flow losses and thus the available force at a given delivery rate.<\/li>\n<li><strong>Flow rate vs. speed:<\/strong> At a given pressure, higher flow increases feed speed; with limited pump power, speed and force trade off against each other.<\/li>\n<\/ul>\n<h3>Example calculation (simplified pressure stroke)<\/h3>\n<p>Given: pressure p = 700 bar (70 MPa), piston diameter d = 90 mm. Piston area A = \u03c0 \u00d7 d\u00b2 \/ 4 \u2248 0.00636 m\u00b2. Theoretical thrust force F = 70,000,000 Pa \u00d7 0.00636 m\u00b2 \u2248 445,000 N = 445 kN. With a conservative overall efficiency \u03b7 = 0.85, \u2248 378 kN remain at the cylinder. Through a wedge with a 1:4 mechanical advantage, \u2248 1.5 MN are available at the splitting element. For the retraction stroke, the effective area reduces to A_eff = A_piston minus A_rod, which correspondingly lowers available force at identical pressure.<\/p>\n<h3>Units and conversions<\/h3>\n<ul>\n<li>1 bar = 0.1 MPa; 700 bar = 70 MPa.<\/li>\n<li>1 kN = 1,000 N; 10 kN \u2248 1,016 kgf (for quick, approximate mass-force intuition).<\/li>\n<li>Hydraulic power P \u2248 p \u00d7 Q (pressure \u00d7 flow); at fixed drive power, increasing flow reduces the pressure reserve and vice versa.<\/li>\n<\/ul>\n<h2>Thrust force in rock and concrete splitters<\/h2>\n<p>Rock and concrete splitters use the thrust force of a hydraulic cylinder to drive a wedge set into pre-drilled boreholes. The wedge angle generates a strong radial splitting force that separates the material along its planes of weakness. The thrust force must overcome friction between wedge and counter-wedges, borehole friction, and the material\u2019s tensile strength in the splitting direction. Consistent force build-up is vital to initiate cracks predictably and to avoid uncontrolled spalling at edges.<\/p>\n<h3>Practical aspects<\/h3>\n<ul>\n<li><strong>Borehole geometry:<\/strong> Diameter and depth influence the friction component and the effective splitting depth.<\/li>\n<li><strong>Wedge angle:<\/strong> Shallow angles increase force transmission but raise friction and require good lubrication.<\/li>\n<li><strong>Rock\/concrete:<\/strong> Anisotropy, grain structure, reinforcement content, and moisture dictate the required splitting force.<\/li>\n<li><strong>Setting sequence:<\/strong> Evenly setting multiple splitting points reduces restraint and lowers the thrust force needed per tool.<\/li>\n<li><strong>Spacing and edge distance:<\/strong> Adequate spacing between boreholes and sufficient distance from free edges promote controlled crack propagation and reduce peak force demands.<\/li>\n<\/ul>\n<h2>Thrust force in concrete demolition shears<\/h2>\n<p>In concrete demolition shears, the thrust force of the hydraulic cylinder is converted via lever arms and joints into a large pressing and cutting force at the jaws. Beyond pure thrust force, jaw kinematics, blade geometry, and residual stresses in the material determine the actual breaking performance. For reference, see <a href=\"https:\/\/www.darda.de\/en\/product-overview\/combi-shears-hcs8\">Combi-Shears HCS8<\/a>. The usable jaw force typically increases as jaw speed decreases, reflecting the mechanical ratios chosen in the linkage.<\/p>\n<h3>Force path and transmission<\/h3>\n<ul>\n<li><strong>Cylinder stroke and levers:<\/strong> Short jaws with a large lever ratio deliver high jaw force at low jaw speed.<\/li>\n<li><strong>Blade shape:<\/strong> Profiled, wear-resistant blades concentrate contact pressure and reduce the force required to bite in.<\/li>\n<li><strong>Reinforcement:<\/strong> Reinforcing steel increases the required peak force; favorable attack points at cracks and edges reduce the demand.<\/li>\n<li><strong>Jaw opening and tip geometry:<\/strong> Suitable opening width and pointed jaw tips improve initial penetration and reduce required starting force.<\/li>\n<\/ul>\n<h2>Hydraulic power packs: pressure, flow rate, and thrust force<\/h2>\n<p>Hydraulic power packs supply the necessary system pressure and oil volume. In practice, appropriately matched <a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-power-units\">hydraulic power units<\/a> are selected to meet pressure and flow requirements. The maximum achievable pressure limits the thrust force, while the flow rate determines the feed speed. A higher pressure level increases available thrust force, but only within the permissible pressure ratings of the cylinder and fittings. Low temperatures increase viscosity and thus losses; warm, stable oil temperatures favor consistent force development. In continuous duty, thermal balance, filtration performance, and reservoir sizing help maintain stable pressure and repeatable force.<\/p>\n<h3>Practical tuning<\/h3>\n<ol>\n<li>Check the tool\u2019s maximum pressure rating and set the power pack accordingly.<\/li>\n<li>Select hose lengths and cross-sections to keep pressure losses low.<\/li>\n<li>Implement a return line without constrictions to avoid backpressure.<\/li>\n<li>Use the specified oil viscosity grade for the expected ambient temperature range to limit throttling losses.<\/li>\n<li>Keep quick couplings clean and fully seated to prevent micro-throttling and pressure drop.<\/li>\n<\/ol>\n<h2>Sizing for application areas<\/h2>\n<p>The required thrust force strongly depends on the application. In concrete demolition and specialized deconstruction, reinforcement ratio, member thickness, and concrete age matter; in rock excavation and tunnel construction, rock class, bedding, and moisture dominate. In natural stone extraction, controlled, low-crack separation is desired, so uniform thrust force development and reproducible wedge forces are paramount. For interior demolition and cutting, precise, metered forces are important to protect adjacent structures. Special operations often require individual testing and safety margins. Where variability is high, conservative sizing combined with stepwise loading ensures process reliability without overstressing components.<\/p>\n<h2>Material and environmental influences on the effectiveness of thrust force<\/h2>\n<p>The bare number for thrust force says little if material behavior and environment are not considered. Moisture, temperature, and microstructure determine where the applied force acts and when separation cracks form. Heterogeneous or reinforced sections may redistribute loads and raise the local force threshold for crack initiation.<\/p>\n<h3>Key influences<\/h3>\n<ul>\n<li><strong>Concrete:<\/strong> Compressive strength, crack widths, carbonation, and reinforcement ratios change the force demand and fracture pattern.<\/li>\n<li><strong>Rock:<\/strong> Foliation, joint spacing, and grain bonding define the splitting direction and the required wedge force.<\/li>\n<li><strong>Temperature:<\/strong> Cold = higher oil viscosity and more friction losses; warm = lower viscosity, but respect thermal limits.<\/li>\n<li><strong>Lubrication:<\/strong> Regularly lubricate wedge guides and joints to reduce friction components.<\/li>\n<li><strong>Surface condition:<\/strong> Dust, slurry, or corrosion in boreholes and guides increases friction and can mask available thrust at the tool tip.<\/li>\n<\/ul>\n<h2>Measurement and monitoring of thrust force<\/h2>\n<p>In practice, thrust force is rarely measured directly. It is common to monitor system pressure and derive cylinder force from the known piston area. For verification, calibrations with load cells or standardized test setups can be performed. Measurement and test procedures should generally follow recognized engineering practice; binding statements for individual cases cannot be derived from this. For diagnostic purposes, logging pressure over time, observing pressure spikes, and correlating with feed displacement offers insight into losses and kinematic bottlenecks.<\/p>\n<h3>Indicators of sufficient thrust force<\/h3>\n<ul>\n<li>Constant pressure values without pronounced pressure spikes.<\/li>\n<li>Smooth tool feed without jerking or blocking.<\/li>\n<li>Reproducible splitting or breaking behavior across multiple setting points.<\/li>\n<li>Measured pressure aligns with expected force at the piston area within reasonable efficiency margins.<\/li>\n<\/ul>\n<h2>Typical failure modes and remedies<\/h2>\n<p>If the available thrust force does not reach the workpiece location, this is often due to losses or unfavorable kinematics. Systematic checks along the hydraulic path and the mechanical lever chain typically reveal the dominant restriction.<\/p>\n<h3>Common causes<\/h3>\n<ul>\n<li><strong>Pressure losses:<\/strong> Hoses that are too long or narrow, restricted couplings, contaminated filters.<\/li>\n<li><strong>Friction:<\/strong> Dry wedges, worn guides, insufficient lubrication.<\/li>\n<li><strong>Poor attack point:<\/strong> Bite far from edges, unfavorable jaw positioning, unsuitable borehole placement.<\/li>\n<li><strong>Tool wear:<\/strong> Dull blades, damaged wedge faces increase force demand.<\/li>\n<li><strong>Air or cavitation:<\/strong> Entrained air or vapor formation reduces stiffness and delays force build-up.<\/li>\n<\/ul>\n<h3>Practical tips<\/h3>\n<ol>\n<li>Check hydraulic pressure with a calibrated gauge and verify the return line.<\/li>\n<li>Clean and lightly lubricate wedges and joints; maintain wear dimensions.<\/li>\n<li>Select attack points that address natural planes of weakness.<\/li>\n<li>Work in several moderate setting steps instead of one maximum push.<\/li>\n<li>Bleed the system to remove air and verify that suction lines and seals prevent air ingress.<\/li>\n<\/ol>\n<h2>Example force chains in selected tools<\/h2>\n<p>The conversion of thrust force into working force follows the tool\u2019s force path. Understanding this chain facilitates proper application and troubleshooting.<\/p>\n<h3>Rock and concrete splitters<\/h3>\n<ul>\n<li>Cylinder thrust force \u2192 wedge feed \u2192 mechanical transmission through wedge angle \u2192 radial splitting force in the borehole \u2192 crack propagation along material weaknesses.<\/li>\n<\/ul>\n<h3>Concrete demolition shears<\/h3>\n<ul>\n<li>Cylinder thrust force \u2192 shear lever mechanism \u2192 concentrated pressing and cutting force at the jaws \u2192 crushing and splitting action in concrete, potentially cutting reinforcing steel.<\/li>\n<\/ul>\n<h2>Selection criteria for the right thrust force<\/h2>\n<p>The suitable thrust force results from member thickness, reinforcement ratio, material class, and the desired separation quality. Tools should be chosen to provide sufficient reserves without exceeding permissible pressure and load limits. Practical selection benefits from verified performance data, realistic material assumptions, and allowance for environmental influences such as temperature and access conditions.<\/p>\n<h3>Guiding questions<\/h3>\n<ul>\n<li>How thick is the member or how large is the block?<\/li>\n<li>What material properties (strengths, jointing) are present?<\/li>\n<li>What access is available and which attack points can be used?<\/li>\n<li>Which hydraulic power packs are available with what pressure\/flow rate?<\/li>\n<li>What quality of separation is required and which tolerances for cracks and edge spalling are acceptable?<\/li>\n<\/ul>\n<h2>Maintenance and preservation of thrust force<\/h2>\n<p>Only well-maintained hydraulic systems deliver the calculated thrust force. Tightness, cleanliness, and proper lubrication are essential. Wear on blades, jaws, and wedge faces acts like an additional resistance and reduces the force that reaches the workpiece. Periodic function checks under load with documented pressure readings preserve traceability and help detect creeping losses early.<\/p>\n<h3>Recommendations<\/h3>\n<ul>\n<li>Change hydraulic oil per manufacturer specifications and monitor filter condition.<\/li>\n<li>Regularly check hoses, couplings, and seals for tightness.<\/li>\n<li>Replace wear parts in time; document functional dimensions.<\/li>\n<li>Calibrate pressure gauges at defined intervals to maintain measurement confidence.<\/li>\n<\/ul>\n<h2>Force interplay and interaction with the material<\/h2>\n<p>Thrust force unfolds its effect in combination with other mechanical influences. In concrete demolition shears, thrust force plus lever transmission creates local contact pressure that initiates cracks. In splitters, thrust force becomes a high, radially oriented splitting stress. The optimal operating point is where local material strength is exceeded without generating unnecessary peak forces. This enables controlled deconstruction with reduced side effects such as vibration or overloads. Coordinating thrust force with suitable kinematics and sequence planning yields predictable, repeatable outcomes across varying materials and site conditions.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Thrust force describes the rectilinear force with which a drive pushes components, separates materials, or advances wedges. In demolition, interior demolition, rock excavation, and natural stone extraction it is a key parameter because it directly determines how efficiently tools such as concrete demolition shears or rock and concrete splitters operate. <a class=\"moretag\" href=\"https:\/\/www.darda.de\/en\/knowledge\/thrust-force\">read more&#8230;<\/a><\/p>\n","protected":false},"author":9,"featured_media":0,"parent":14846,"menu_order":0,"comment_status":"open","ping_status":"open","template":"tmpl\/template-wissen.php","meta":{"_acf_changed":false,"footnotes":"","_members_access_role":[],"_members_access_error":""},"class_list":["post-19770","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Thrust Force in Hydraulics | Calculation &amp; Uses<\/title>\n<meta name=\"description\" content=\"Explore thrust force in hydraulic cylinders \u27a4 powering demolition 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