Supporting Tooling Design Scheme for Rapid Mold Change in Workshops
Conventional mold replacement workflows in injection workshops rely on overhead traveling cranes for manual hoisting, manual bolt disassembly of clamping plates and separate disconnection of cooling water and hydraulic pipelines. A single mold change typically consumes over 60 minutes, resulting in substantial equipment standby loss, heavy manual labor intensity, and hidden risks including mold collision damage, pipeline leakage and positioning offset. Based on SMED (Single Minute Exchange of Die) lean manufacturing theory, this supporting tooling design scheme adopts standardized positioning, integrated quick-disconnect pipelines, synchronous auxiliary equipment and load-bearing mechanisms to compress mold disassembly, docking and debugging durations. The design is compatible with small, medium and large injection molds, balancing universality, operational safety and on-site practicality. Complete supporting tooling can cut single mold change time to within 15 minutes, drastically improving equipment overall equipment efficiency (OEE) for multi-variety, small-batch flexible production.
1. Design of Mold Positioning & Load-Bearing Tooling
Unify base mounting dimensions of all workshop molds and equip integrated cast iron load-bearing pallets with through T-slots on surfaces to accommodate clamping plates of molds with varying length and width. Position sleeve fixtures are embedded at pallet bottoms, matching fixed positioning pins on injection mold platens; molds achieve automatic alignment after pushing in, eliminating manual parallelism calibration and preventing flashing and uneven wall thickness caused by misaligned clamping. Wear-resistant backing plates are embedded in pallets to avoid scratching platen surfaces during long-term hoisting. Customize double-layer hydraulic lifting transfer trolleys with load capacity ranging from 300kg to 3 tons. Lifting rollers on both sides adjust height to align with injection machine platens, removing reliance on overhead hoisting. Self-locking rollers and lateral limit baffles prevent mold sliding during transfer, with flexible steering suitable for narrow workshop aisles to eliminate mold falling and collision hazards from overhead hoisting. For heavy thick-walled molds such as bathroom and rotational molding molds, install retractable buffer support arms at trolley-machine docking positions to share mold self-weight and prevent pallet deformation from unbalanced single-end stress. Polyurethane buffer pads cover arm surfaces to protect mold parting lines and mirror cavities from scratches.
2. Integrated Quick-Disconnect Tooling for Water, Air & Electrical Circuits
Abandon separate disassembly of individual cooling water pipes and design integrated water manifolds. Each mold is fitted with a unified male integrated plate, while injection machines install fixed female manifolds; one push completes full water circuit docking. Built-in one-way sealing valves inside joints automatically lock water during separation, eliminating ground water slipping hazards and removing time-consuming steps of draining water and winding PTFE tape. Joints withstand temperatures from 0℃ to 120℃, compatible with hot and cold mold temperature controller circulation pipelines. For mold core-pulling and ejection hydraulic cylinders, adopt multi-channel integrated quick-disconnect couplings; air circuits install self-locking quick connectors. All pipelines are organized into integrated side wire ducts, requiring only one main joint disconnection instead of separate removal of each hydraulic and air pipe. Matched pipeline retractable reels automatically recover pipelines post mold change to avoid extrusion damage from dragging. Heating bands and thermocouple temperature sensing wires integrate unified aviation plugs, with fixed socket bases on mold sides. One plug-and-play operation completes all temperature control circuit docking, eliminating scattered wire tangling and thermocouple misconnection that cause mold temperature out of control and shorten post-change debugging time.
3. Quick Clamping Tooling for Mold Locking Plates
Phase out traditional manually twisted bolt clamping plates and install multiple sets of hydraulic automatic clamping assemblies on fixed and moving platens of injection machines, matched with miniature hydraulic pump stations for synchronous clamping or release via one-button control. Clamping plate strokes adapt to pallets of varying thickness, delivering uniform clamping force to prevent mold shifting and parting line flashing caused by inconsistent manual tightening torque. Equip spare manual eccentric quick clamps for small trial molds, requiring no wrenches – rotating eccentric handles completes rapid clamping, serving as a supplement to hydraulic clamps for frequent small-batch mold switching. All quick clamping tooling adds limit stop blocks to avoid loose sliding during mold opening and closing, paired with clamping force overload alarms that prompt operators when pressure is insufficient to prevent safety accidents and flashing from loose molds during production.
4. Synchronous Auxiliary Supporting Tooling for Mold Change
Install constant-temperature mold preheating racks at workshop corners to preheat standby molds in advance. After mold change, machines reach production process temperatures immediately without long heating standby periods. Racks support zoned temperature control matching ABS, PP, nylon and other raw material mold requirements. Dedicated integrated tool carts for mold change store wrenches, sealing gaskets, spare quick-disconnect fittings, cleaning brushes and copper scrapers in layered fixed storage positions, eliminating repeated trips to warehouses for auxiliary materials during mold replacement. Leakage collection trays on carts capture residual water during pipeline disassembly to maintain clean machine floors. Equip small hydraulic mold spreaders for thick-walled molds with deep undercuts to quickly open parting lines before mold change, facilitating cavity cleaning and exhaust inspection without manual prying that scratches mirror cavities and shortens mold maintenance time.
5. Generalization & Safety Protection Supporting Design
Unify standard specifications for all pallets, transfer trolleys and integrated quick-disconnect manifolds to achieve full workshop compatibility. Newly developed molds strictly follow standard base dimensions, while outdated molds are modified with adapter plates to avoid customized dedicated accessories and reduce transformation costs. Complete safety protection structures are matched for all tooling: transfer trolleys install hand brakes and anti-collision buffer blocks; water joints equip splash-proof shields; hydraulic clamping plates add safety light curtains that lock machine clamping functions during mold change operations. All metal edges of tooling are fully chamfered to prevent operator scratches. Uniform color coding identifies water, hydraulic and air circuits on integrated joints to avoid reverse connection errors; engraved positioning lines on pallets and trolleys enable one-step mold placement and reduce misoperation risks for new staff.
Summary
The supporting tooling design for rapid mold change centers on four core links: transfer load-bearing, pipeline docking, mold locking and pre-production auxiliary processing. Integrated quick-disconnect structures, hydraulic automatic clamping and lifting transfer trolleys replace labor-intensive traditional disassembly workflows, supplemented by preheating racks, integrated tool carts and full safety protection components to form a complete solution compatible with both new and renovated molds. Long-term implementation drastically shortens mold change duration and machine standby loss, while eliminating safety hazards and mold damage from hoisting and pipeline disassembly. This scheme effectively improves injection machine utilization rate and reduces operator labor intensity, perfectly fitting modern workshops with frequent mold switching for multi-variety small-batch orders.
