{"id":3654,"date":"2025-12-02T04:16:25","date_gmt":"2025-12-02T04:16:25","guid":{"rendered":"https:\/\/www.woojin.help\/?p=3654"},"modified":"2025-12-02T04:16:27","modified_gmt":"2025-12-02T04:16:27","slug":"clamp-boost-stabilization-logic-in-g5-with-mold-protection-region-handling","status":"publish","type":"post","link":"https:\/\/www.woojin.help\/ko\/clamp-boost-stabilization-logic-in-g5-with-mold-protection-region-handling\/","title":{"rendered":"Clamp & Boost Stabilization Logic in G5 (with Mold Protection Region Handling)"},"content":{"rendered":"
<\/div>\n

1. Background<\/strong><\/p>\n\n\n\n

Direct-hydraulic clamp systems with spring-loaded molds generate rapidly increasing reaction forces near mold touch.<\/p>\n\n\n\n

If hydraulic flow or pressure transitions occur in the low-pressure region, the clamp may bounce backward or oscillate during mold closing and early boost.<\/p>\n\n\n\n

G5 introduces a stabilization concept based on hydraulic sequencing, controlled pump contribution, and a dedicated mold protection profile.<\/p>\n\n\n\n

2. Root Causes of Instability<\/strong><\/p>\n\n\n\n

    \n
  1. Flow collapse during pump de-joining
    <\/strong>If pumps are allowed to join in the mold protection region, turning the join valve OFF just before mold touch creates a sudden flow drop and pressure collapse, which leads to touch \u2192 rebound \u2192 re-touch.<\/li>\n\n\n\n
  2. Hydraulic ratio mismatch between booster and tie-pressure cylinders
    <\/strong>The tie-pressure cylinder has a higher effective ratio than the booster.
    Early high-pressure contribution from P2 pushes the clamp backward before the booster develops sufficient holding force.<\/li>\n\n\n\n
  3. Spring-loaded molds amplify small disturbances
    <\/strong>Near mold touch, the spring force rises steeply.
    Small variations in flow or pressure are magnified into mechanical bounce.<\/li>\n<\/ol>\n\n\n\n

    3. Stabilization Strategy Implemented in G5<\/strong><\/p>\n\n\n\n

    3.1 P1-only mold close in the mold protection region<\/strong><\/p>\n\n\n\n

    Mold close is performed with P1 only, with pump joining disabled in the mold protection zone.<\/p>\n\n\n\n

    This avoids abrupt flow reduction and stabilizes the mold-touch phase.<\/p>\n\n\n\n

    3.2 Mold protection based on s_target \/ v_target + time-based V-profile<\/strong><\/p>\n\n\n\n

      \n
    • \uadf8\ub9cc\ud07c mold protection position<\/strong> is defined as s_target<\/strong>.<\/li>\n\n\n\n
    • \uadf8\ub9cc\ud07c mold protection speed<\/strong> is defined as v_target<\/strong>.<\/li>\n\n\n\n
    • Once the clamp enters the mold protection region:\n
        \n
      • The controller switches the velocity profile (Vprof) to time-based mode<\/strong>.<\/li>\n\n\n\n
      • The booster cylinder continues to receive flow at the mold protection speed (v_target)<\/strong>, instead of using tight position feedback.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n

        Technical effect:<\/strong><\/p>\n\n\n\n

          \n
        • The system behaves as a constant, low-speed feed<\/strong> into the mold protection zone.<\/li>\n\n\n\n
        • Position error is not aggressively corrected; instead, a stable, limited speed is maintained.<\/li>\n\n\n\n
        • This prevents overshoot and oscillation at mold touch, while still protecting the mold mechanically.<\/li>\n<\/ul>\n\n\n\n

          3.3 Mechanical role separation of P1 and P2<\/strong><\/p>\n\n\n\n

            \n
          • P1<\/strong> continuously drives the booster cylinder.<\/li>\n\n\n\n
          • P2<\/strong> drives the tie-bar cylinders.
            Booster motion remains stable even if tie-bar movement introduces minor disturbances.<\/li>\n<\/ul>\n\n\n\n

            3.4 Early boost with P1 only until a minimum pressure (~10 bar)<\/strong><\/p>\n\n\n\n

            In the early boost phase, only P1 is active.<\/p>\n\n\n\n

            P2 is blocked until the system reaches a minimum internal pressure (\u224810 bar), at which point the booster can resist the tie-pressure cylinder.<\/p>\n\n\n\n

            3.5 Pump joining only above a higher pressure level (~40 bar)<\/strong><\/p>\n\n\n\n

            Full pump joining (P1 + P2) is allowed only after the clamp pressure exceeds approximately 40 bar.<\/p>\n\n\n\n

            Above this pressure, the system is mechanically stable and can accept additional flow without backward movement.<\/p>\n\n\n\n

            3.6 Limited P2 contribution (\u22480.7%)<\/strong><\/p>\n\n\n\n

            Even after joining, P2\u2019s contribution is intentionally limited to avoid excessive pressure rise rate and mechanical shock to spring-loaded molds.<\/p>\n\n\n\n

            3.7 \u201cValve OFF \u2192 Motion OFF\u201d sequence at the end of boost<\/strong><\/p>\n\n\n\n

            Boost ends by switching the valve OFF first, then stopping motion.<\/p>\n\n\n\n

            This prevents sudden depressurization, reverse flow, and clamp relaxation.<\/p>\n\n\n\n

            4. Technical Effects<\/strong><\/p>\n\n\n\n

            Improvement<\/strong><\/td>Technical Effect<\/strong><\/td><\/tr>
            P1-only mold close<\/td>Eliminates flow collapse and mold bounce<\/td><\/tr>
            Mold protection via s_target \/ v_target + Vprof<\/td>Smooth and stable touch at constant mold-protection speed<\/td><\/tr>
            Minimum pressure before joining (~10 bar)<\/td>Prevents backward clamp movement in the low-pressure region<\/td><\/tr>
            Joining only above ~40 bar<\/td>Stable high-pressure boost<\/td><\/tr>
            Limited P2 participation<\/td>Smooth pressure gradient and reduced mechanical shock<\/td><\/tr>
            Valve-first shutdown<\/td>Stable boost completion without pressure relaxation<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

            Overall Result:<\/strong><\/p>\n\n\n\n

            Stable mold-touch and boost behavior with no bounce, no backward movement, and no pressure collapse, even for spring-loaded molds.<\/p>\n\n\n\n

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

            1. Background Direct-hydraulic clamp systems with spring-loaded molds generate rapidly increasing reaction forces near mold touch. If hydraulic flow or […]<\/p>\n","protected":false},"author":17,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[382,402],"tags":[],"class_list":["post-3654","post","type-post","status-publish","format-standard","hentry","category-imm-g5-manual","category-ko"],"_links":{"self":[{"href":"https:\/\/www.woojin.help\/ko\/wp-json\/wp\/v2\/posts\/3654","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.woojin.help\/ko\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.woojin.help\/ko\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.woojin.help\/ko\/wp-json\/wp\/v2\/users\/17"}],"replies":[{"embeddable":true,"href":"https:\/\/www.woojin.help\/ko\/wp-json\/wp\/v2\/comments?post=3654"}],"version-history":[{"count":1,"href":"https:\/\/www.woojin.help\/ko\/wp-json\/wp\/v2\/posts\/3654\/revisions"}],"predecessor-version":[{"id":3655,"href":"https:\/\/www.woojin.help\/ko\/wp-json\/wp\/v2\/posts\/3654\/revisions\/3655"}],"wp:attachment":[{"href":"https:\/\/www.woojin.help\/ko\/wp-json\/wp\/v2\/media?parent=3654"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.woojin.help\/ko\/wp-json\/wp\/v2\/categories?post=3654"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.woojin.help\/ko\/wp-json\/wp\/v2\/tags?post=3654"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}