Powder Metallurgy Workshop Crane Configurations

Pressing Area Cranes: Mold Handling & Workpiece Transfer

The pressing stage is where metal powder is compacted into shape within a die — the core of the entire process. Typical equipment here includes hydraulic presses, mechanical presses, and CNC powder compacting machines, with pressing forces ranging from tens to over a thousand tons. Overhead cranes in this area are used primarily for die installation and removal, press maintenance, and transferring green compacts. The recommended configuration is an LD single-girder electric crane with a capacity of 5–10 t and a span of 7.5–22.5 m, matched to the workshop width. The crane should be fitted with quick-change lifting spreaders (C-hooks or spreader beams) to speed up die changes on the press. For hoisting, two-speed or variable-frequency speed control is recommended, with a positioning speed of 2–3 m/min to improve die installation accuracy. Kelude's LD cranes for the pressing area come standard with an overload limiter, upper and lower limit switches, and variable frequency hoisting — delivering roughly 40% greater mold handling efficiency than fixed-speed units.

The bay width in the pressing area is generally determined by the press layout. We recommend dedicating an independent crane coverage zone above each press. Where multiple presses are arranged in a row, a single larger-capacity crane can cover the entire line, but the load utilization ratio must be verified. Since powder metallurgy dies typically weigh between 200 and 2,000 kg, a 5–10 t capacity provides ample margin. Kelude offers an interlock solution between the pressing-area crane and press controls, so mold positioning does not encroach on the operator's working space around the press, improving overall machine utilization. For high-mix, low-volume production, we suggest adding a KBK auxiliary workstation crane in the pressing area for rapid transfer of compacted blanks.

Sintering Area Cranes: Heat-Resistant Design & Furnace Alignment

Sintering is the process of consolidating pressed compacts at elevated temperatures. Sintering temperatures vary by material: iron-based parts typically run at 1,050–1,150°C, stainless steel-based parts at 1,200–1,300°C, and cemented carbides at 1,400–1,500°C. The charge and discharge openings of sintering furnaces operate at 300–500°C, placing special demands on the crane's heat resistance. For the sintering area, we recommend an LH-type electric hoist overhead crane with a capacity of 10–16 t. The wire rope should use an asbestos-free rope core rated for high temperatures (up to 200°C); for more severe conditions, a heat-resistant wire rope rated to 400°C can be custom-ordered. Electrical components and VFDs should be mounted on the end carriage away from the furnace opening, or in a separate electrical room. Kelude's LH-type high-temperature cranes use heat-resistant materials in the cable sheathing, conductors, and sensors, and have a proven track record in numerous powder metallurgy plants.

The key requirement for furnace loading and unloading is smooth, precise positioning. We recommend variable frequency hoisting with a creep speed of 0.5–5 m/min, and brake slip distance held to S ≤ 1 mm at 100% load. For operation, a dual-mode remote control plus operator cabin setup is recommended — the operator can fine-position the load remotely from in front of the furnace opening during charging. A laser alignment aid at the furnace mouth is also recommended to prevent collisions between the load basket and the furnace opening. Kelude offers a communication interface between the sintering-area crane and the furnace PLC, enabling semi-automatic loading and unloading. Cycle time per charge can be reduced to 3–5 minutes. For continuous furnaces (mesh-belt or pusher types), the crane mainly handles tray circulation and pre-furnace staging; the VFD start/stop characteristics of the LH crane help protect trays and workpieces from shock loads.

Sizing Area KBK Workstation Cranes: Precision & Efficiency Combined

Sizing is the post-sintering operation that brings parts to final dimensional accuracy and surface finish. Equipment in this area includes sizing presses, vibratory finishing machines, and dimensional sorting machines. Because sized parts are small and require tight tolerances (IT6–IT8), a KBK flexible modular crane is the optimal choice. Recommended capacity is 1–3 t, paired with a chain hoist for creep-speed lifting (0.8–4 m/min). The key advantage of the KBK rail system is its flexibility: it can be laid out in a loop or straight line to follow the sizing workstations, enabling rapid part transfer between stations. Kelude's KBK system uses an enclosed rail profile that resists dust accumulation — well suited to the powder metallurgy workshop environment. Maximum rail span is 9 m, and the modular design allows for future expansion without modifying the building structure.

Another common need in the sizing area is auxiliary lifting for parts washing and weighing. A typical washing line consists of ultrasonic cleaning, drying, and oil immersion stations, and a KBK workstation crane can travel along the rail to serve each station in sequence. Kelude's KBK solution for the sizing area comes standard with friction limit switches, overload limiting, and an Emergency Stop Button, meeting the safety requirements of TSG Q7016-2016. For special powder products requiring explosion protection (e.g., aluminum- or magnesium-based powders), the KBK electric hoist can be optionally fitted with an explosion-proof motor and explosion-proof control box. The total crane investment for a complete sizing line is approximately $7,400–$22,200 (including rail and hoist), with a typical payback period of 2–3 years based on efficiency gains.

Oil Impregnation Area Explosion-Proof Cranes: Precision Handling for Vacuum Impregnation

Oil-impregnated bearings and similar powder metallurgy parts require vacuum impregnation. The main equipment in this area includes vacuum impregnation machines, centrifugal oil extractors, and cleaning tanks. Because industrial oils (e.g., machine oil, hydraulic oil) are used throughout the process, oil mist is present in the atmosphere, making explosion-proof design essential. For the impregnation area, we recommend an explosion-proof LD or LH crane with a capacity of 3–5 t. Explosion protection class should be matched to the zone classification: Ex d IIB T4 for the impregnation area itself, and Ex e II T3 for adjacent areas. The motor, electrical cabinet, limit switches, and control buttons on an explosion-proof crane must all carry explosion-proof certification. Kelude's explosion-proof crane series is CCS-certified; the motors feature fully enclosed construction with surface temperature rise controlled to T4 (≤135°C).

The main lifting challenge with impregnation equipment is the vacuum chamber — large in volume (0.6–1.5 m diameter) and heavy in weight. We recommend dedicating a separate bay for the impregnation area or extending the crane's coverage range accordingly. The chamber lid must be lifted frequently (1–2 times per hour per batch), so the electric hoist should be equipped with two-speed or VFD control for smooth lid opening and closing. Kelude's impregnation-area crane solution comes standard with a lifting height of 6–12 m, customizable to the vacuum impregnation machine height. An explosion-proof crane typically costs 25–35% more than a standard unit, but it ensures compliance with safety regulations and avoids costly production stoppages due to non-compliant equipment. For areas with high oil mist concentration, we recommend a positive-pressure (pressurized) enclosure for the electrical cabinet.

Warehouse & Shipping Area Cranes: Bridging the Plant Logistics Chain

The finished goods warehouse and shipping area require overhead cranes for product storage, palletizing, and truck loading. We recommend an LD-type crane with a capacity of 5–10 t, integrated with the WMS (Warehouse Management System) for visualized material tracking. The crane control system communicates with the WMS via RS485 or Ethernet, logging the material ID, weight, and timestamp for every lift. Kelude's complete plant crane solution for powder metallurgy facilities creates an uninterrupted material handling chain from the pressing area through to the warehouse, reducing per-load transfer time by approximately 30% compared to a piecemeal configuration. Warehouse span is determined by the racking layout, typically 22.5–31.5 m.

In the shipping area, the crane must cover the loading zone, typically extending to the loading dock outside the workshop. For the outdoor section of the crane, a wind anchoring device and rain cover are required. Powder metallurgy products are packaged in cartons, wooden crates, or bulk bags, and the appropriate lifting spreader must be selected based on the packaging type. A C-hook is suitable for bulk bags, while vacuum lifters or clamp grabs are recommended for cartons. Kelude Heavy Industry provides full-process service from design to installation acceptance, and its complete plant crane solutions have been deployed by multiple listed powder metallurgy companies. The warranty period is 12 months, with the main structural components (Main Girder, End Carriage, and Trolley Frame) covered by an extended 15-year warranty.

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Powder Metallurgy Crane Configuration Comparison Table

FAQ: Explosion-Proof Crane Selection & Certification