3C Manufacturing Intralogistics: How AMRs Connect Material Warehouses, SMT Lines, Assembly, and Shipping

In 3C manufacturing, material flow is rarely a simple trip from a warehouse to a production line. Electronic components, totes, ESD cabinets, feeder carts, pallets, trays, finished cartons, and returnable carriers all move through different storage and production environments. The challenge is to connect these movements without creating manual handoffs, inventory blind spots, or production delays.

From our engineering perspective at KH Group, an effective 3C intralogistics system should connect eight operational stages: raw material storage, material sorting, SMT production, PCBA storage, assembly, finished goods storage, split-case picking, and shipping. The right solution normally combines several AMR types with workstations, robotic arms, elevators, conveyors, and iWMS, rather than forcing one robot model to handle every task.

What Does a Complete 3C Factory Logistics Workflow Include?

A 3C factory handles a wide mix of materials and load carriers. High-value electronic parts may travel in totes or ESD-safe cabinets. Larger components can arrive on full pallets. Assembly materials may be delivered on carts or trays, while finished products leave the line in cartons and later move as palletized loads.

The process therefore needs different handling methods at different points. Lurking lift AMRs are suitable for standardized carts and racks, load-carrying AMRs support direct top-loading or roller transfer, and fork-type AMRs handle palletized loads. Robotic arms can automate putaway or palletizing, while iWMS records inventory changes and coordinates inbound and outbound tasks.

How Can AMRs Automate the Eight Main Material-Handling Stages?

1. Raw Material Warehouse

The raw material warehouse receives several load formats and must make them available to downstream sorting and production. Automated inbound transport reduces forklift traffic and creates a cleaner handoff between receiving, storage, and inventory management.

Handling objects. This area does not deal with one uniform load. Full pallets hold bulk incoming materials, totes protect and separate electronic parts, and multi-level racks carry cartons or smaller production lots. Each carrier has a different pickup height and storage interface. Automating the warehouse therefore starts by classifying the carrier, matching it to a storage location, and giving every movement a traceable inventory identity.

Logistics solution. KH Group combines several handling mechanisms because the loads are physically different. A lurking lift AMR enters beneath a compatible rack and lifts it without manual coupling. A stacker fork-type AMR handles palletized materials and elevated storage positions. A backpack-style handling robot can serve narrow-bin or tote workflows. Above these devices, iWMS assigns storage locations and synchronizes inventory data, reducing the information-management burden created by many material categories.

Material-handling process. After receiving inspection, iWMS identifies whether the inbound unit is a pallet, tote, or carton rack and creates the appropriate putaway task. A fork-type AMR moves full pallets to pallet storage, while lift AMRs transfer totes and multi-level racks into their assigned areas. Once docking or putaway is confirmed, the robot reports task completion and iWMS updates the material quantity and location. This closed loop replaces manual recording and helps prevent stock from being placed in the wrong zone.

2. Raw Material Sorting

Before production, components must be selected according to work orders and grouped into production-ready kits. This area often involves frequent order changes and many small parts, so accurate task execution and tote traceability are essential.

Handling objects. Sorting is centered on individual totes and multi-level racks loaded with multiple totes. A tote may contain one component family, while a rack can represent a complete production kit. The challenge is not the weight of the load but the number of SKUs and the need to match every selected part with the correct work order.

Logistics solution. A lurking lift AMR brings racks to the picking station instead of requiring operators to walk through long storage aisles. At the station, the work order guides manual selection. A three-level conveyor sorting AMR then assigns small parts to the correct kit positions. This combination keeps human judgment at the value-added picking point while automating the repetitive travel and tote distribution around it.

Material-handling process. The system releases a work order and presents the required source rack at the picking station. After the operator selects the specified components, the sorting AMR distributes them into the corresponding kitting totes. Completed totes are consolidated into a multi-level rack, and a lift AMR returns the rack to the dispatch side of the line before delivering it to the correct workshop. Each confirmation can be recorded against the order, improving kitting accuracy and making shortages easier to identify before production begins.

3. SMT Workshop

The SMT workshop requires timely delivery of electronic components and rapid transfer of work-in-process materials. ESD control, line-side space, docking repeatability, and coordination with production status are important design conditions.

Handling objects. SMT logistics involves ESD cabinets, feeder carts, and electronic component carts rather than ordinary warehouse pallets. These carriers can be tall, narrow, and sensitive to sudden movement. PCBs and components may shift if a cart tilts or docks poorly, so stable travel, controlled acceleration, ESD-compatible carriers, and repeatable line-side positioning are critical.

Logistics solution. A lurking lift AMR is used for standardized feeder and component carts because it can pick them up from underneath. Where production equipment has a roller interface, a lift-roller load-carrying AMR can align with the station and complete an automatic transfer. Using both forms allows the same scheduling system to manage manual line-side carts and equipment-to-equipment handoffs.

Material-handling process. When an SMT line requests material, the scheduling system dispatches the appropriate AMR to collect the prepared cabinet or cart and deliver it to the specified station. Work-in-process material can then be buffered between SMT and DIP, while completed PCBAs are removed from the line and sent to storage or the next process. Automated calls and status feedback reduce dependence on operators noticing shortages and help stabilize frequent replenishment cycles.

4. PCBA Storage

PCBA storage connects production output with later assembly demand. A coordinated AMR and robotic-arm cell can reduce repeated manual rack handling while maintaining accurate inventory records.

Handling objects. Finished and semi-finished PCBAs are typically placed in totes and carried on multi-level racks. These materials require clear batch identification and controlled storage because a similar-looking tote may contain a different board model, production lot, or process status. Manual rack movement and handwritten location records can easily separate the physical material from its inventory information.

Logistics solution. KH Group uses a lurking lift AMR to transport the complete rack to a fixed workstation. A robotic arm transfers individual totes into their assigned storage positions, while iWMS records the relationship between material, tote, rack location, and order. The robot handles repetitive movement, and the software provides the inventory discipline that physical automation alone cannot create.

Material-handling process. The AMR first delivers the loaded rack to the robotic workstation and confirms that it is correctly docked. The robotic arm scans or identifies each tote and performs automatic putaway. iWMS then completes the inbound record and updates available stock. For outbound demand, the system identifies the required tote and guides retrieval; where manual picking remains, the operator follows the digital instruction rather than searching the warehouse by experience.

5. Assembly Workshop

The assembly workshop may require racks, trays, pallets, and finished product cartons within the same area. Because transport interfaces differ, the system often uses multiple robot types under one scheduling platform.

Handling objects. Assembly logistics has the widest carrier mix in the factory. Material carts deliver structural parts and kits to manual stations, trays feed components into automated equipment, pallets support heavier loads, and finished cartons leave the line after packing. Their sizes and transfer heights differ, so forcing them onto one carrier format can create unnecessary repacking and extra handling.

Logistics solution. A lurking lift AMR moves full racks to manual lines, a load-carrying AMR with a lift or roller module docks with automated equipment for tray feeding, and a fork-type AMR handles pallets and heavier finished loads. The mixed fleet allows each carrier to retain the interface best suited to its process while one scheduler coordinates priority and traffic.

Material-handling process. Full material racks are called to the assembly line according to the production plan, while tray loads are transferred directly to automated stations. After assembly and packing, finished cartons or pallets are removed from the line to keep the discharge area clear. For multi-floor facilities, the AMR requests an elevator, enters after receiving permission, confirms the destination floor, and resumes the assigned mission after the door opens. This creates a continuous route without manual reloading at the elevator.

6. Finished Goods Storage

Finished goods storage usually handles empty pallets and full pallets of cartons. Automated pallet supply, robotic palletizing, and AMR transfer can create a continuous flow from production output to warehouse inventory.

Handling objects. Finished goods storage alternates between empty pallets and full pallets of packed cartons. Empty pallets must arrive before the palletizing cell stops, while full pallets must leave quickly enough to prevent a discharge backlog. Because full loads are tall and heavy, safe fork entry, stable load centers, and verified pickup conditions are essential.

Logistics solution. An industrial robot forms a consistent carton stack, and a stacker fork-type AMR supplies empty pallets and removes completed loads. iWMS allocates warehouse locations and keeps the physical pallet movement synchronized with finished goods records. This arrangement reduces manual pallet handling and avoids asking operators to enter active palletizing or high-rack areas repeatedly.

Material-handling process. The AMR first places an empty pallet at the palletizing position. Once the industrial robot completes the carton pattern, the cell sends a pickup-ready signal. The fork-type AMR verifies the load, collects the full pallet, and transports it to the location assigned by iWMS. After successful putaway, inventory status changes from production output to available finished stock, creating a traceable handoff between manufacturing and warehousing.

7. Split-Case Picking

Split-case picking manages outbound orders that require selected cartons rather than full pallets. AMRs bring multi-level racks to the picking area, while PDA instructions, iWMS, and put-wall guidance help operators complete the correct order.

Handling objects. Split-case picking uses multi-level racks filled with cartons rather than full outbound pallets. Orders are fragmented, SKU counts are high, and several small orders may be processed at the same station. In this environment, walking and searching consume more time than the actual pick, while manual sorting creates a high risk of placing a carton into the wrong order.

Logistics solution. A lurking lift AMR turns the process into goods-to-person picking by bringing the required rack directly to a fixed station. iWMS determines which rack serves each order and controls the inbound and outbound sequence. PDA instructions and a put wall then guide the operator through carton placement, separating human picking from long-distance travel.

Material-handling process. During replenishment, the operator scans cartons with a PDA and confirms their rack positions before an AMR returns the loaded rack to storage. When an outbound order is released, iWMS identifies the source rack and dispatches a robot to the picking station. The operator follows the digital prompt and places each carton into the corresponding put-wall position. After confirmation, the AMR returns the rack and inventory is updated, helping the system cope with fragmented, multi-SKU orders.

8. Finished Goods Shipping

The final logistics stage moves shipping units from the warehouse or palletizing area to the loading dock. Fork-type AMRs can standardize pallet movement and reduce repeated forklift travel in busy outbound areas.

Handling objects. Outbound shipping deals with three related elements: the goods, the carrier that supports them, and the final loaded configuration. A single carton may be picked for a B2C order, while B2B shipments may leave as full pallet loads. The shipping process must preserve the correct relationship between the goods, order, pallet, staging lane, and assigned truck.

Logistics solution. A fork-type AMR provides repeatable pallet movement between palletizing, storage, and the loading dock. The vehicle can be dispatched by order priority rather than operator availability, reducing forklift crossings and making outbound staging more orderly. The final truck-loading step can remain manual while the internal transfer is automated.

Material-handling process. When a shipping order is ready, the system verifies the pallet or carrier and assigns a staging lane. If palletizing is required, an AMR supplies the empty pallet and removes the completed load after receiving a ready signal from the cell. The fork-type AMR then transports the shipping unit to the correct dock. The operator performs the final visual check and loads the truck, while the system records that the material has left internal inventory.

Which AMR Type Fits Each 3C Logistics Task?

The robot should match the load carrier and transfer interface. A mixed fleet can be managed as one system, but each vehicle should have a clear role. The following comparison provides a practical starting point.

Lurking Lift AMR - KHC060D & KHC100D Series Load-carrying AMR - KHM060 Series Fork-type AMR - KHD150D/KHD300 Small King Kong Series Fork-type AMR - KHFD150D Series

What Must Be Integrated Beyond the Mobile Robots?

Reliable automation depends on the interfaces around the robot. At the software level, transport orders may originate from ERP, MES, WMS, or iWMS. A scheduling system converts these requests into executable missions, assigns the appropriate robot, manages priority, and controls traffic at shared intersections.

At the equipment level, AMRs may communicate with conveyors, robotic arms, elevators, automatic doors, PLCs, production lines, and charging stations. Each handoff needs a defined request, permission, arrival, transfer, completion, and exception signal. Without this handshake logic, a robot can reach the correct place but still fail to complete the business process.

• Material and carrier study: Record dimensions, weight, center of gravity, orientation, surface condition, and transfer interface.
• Flow and capacity study: Calculate average and peak missions, travel distance, loading time, unloading time, congestion, and charging demand.
• Site study: Verify aisle widths, turning space, slopes, floor joints, elevator size, door control, and pedestrian crossings.
• System interface study: Define data ownership and communication between iWMS, MES, WMS, PLCs, and the robot scheduler.
• Safety study: Evaluate mixed traffic, blind corners, restricted areas, emergency handling, and manual recovery procedures.
• Acceptance criteria: Set measurable targets for mission success, docking accuracy, throughput, system availability, and traceability.

Where Has This Type of Intelligent Logistics Been Applied?

KH Group's project approach can be adapted to different 3C production environments. The following applications are not simple point-to-point robot trials. They connect storage, production, line-side feeding, and system data across larger operating areas. Each case uses a different fleet size and interface strategy because the material carriers, production rhythm, cleanliness requirements, and existing equipment are different.

Intelligent Logistics Project for a 3C Manufacturing Base

This high-end manufacturing base and modern logistics center covers approximately 510 mu, with a planned floor area of about 610,000 square meters. Its production environment includes more than 60 SMT lines, over 400 flexible assembly lines, long-distance raw material routes, and multiple large clean production areas. The scale makes manual dispatching difficult because material calls originate from many lines and travel over long routes.

KH Group's solution uses a large mobile-robot fleet coordinated with the intelligent warehouse system. Robots collect materials from storage, deliver them to designated line-side interfaces, and cooperate with production equipment through RCS-based dispatching. The project materials indicate that one dispatcher can coordinate feeding across production lines, while warehouse operation moves toward a lights-out model. This reduces repeated manual travel, improves delivery consistency, and creates a digital record of material movement from storage to production.

Digital and Green Factory for Air-Conditioning Production

This air-conditioning factory combines 5G, IoT, big data, and intelligent manufacturing technologies. Its operating environment includes eight digital production lines, sixteen digital optimization laboratories, and an intelligent lights-out facility. Material routes cover raw material outbound, line-side delivery, finished product transfer, and warehouse return, so the project requires both flexible cart handling and pallet transport.

The deployed solution combines 21 lurking lift AMRs with four fork-type AMRs and connects the scheduling platform to MES and WMS. Lift AMRs handle frequent line-side material calls, while fork-type units manage palletized loads. Robots can dock with equipment without stopping the production machine, allowing continuous replenishment. The integrated system improves delivery efficiency and accuracy while supporting the factory's energy-saving and low-labor operating objectives.

Whole-Factory Material-Handling Project for a PCB Plant

This project serves a PCB manufacturer whose processes include panel preparation, lamination, drilling, and other connected production stages. Different board types and process routes create frequent transfers between buffer storage and production equipment. In a controlled workshop, manual cart movement also adds personnel traffic and makes dust-control management more difficult.

KH Group deployed 36 lurking lift AMRs to connect cached materials with process equipment. When a machine requests material, the system identifies the corresponding rack, dispatches an AMR, and delivers it to the required interface without repeated manual searching or trolley handling. The robots can adapt to different process routes, including double-sided and multi-layer board production. By automating these transfers, the project improves delivery efficiency and reduces unnecessary personnel movement in the clean production area.

Whole-Factory Material-Handling Project for a 3C Factory

This small-appliance manufacturing project covers supplier material inbound, component distribution, semi-finished assembly, finished product packing, and other internal logistics stages. The material flow therefore crosses the warehouse, preparation areas, assembly lines, and packing stations rather than remaining within one workshop.

Nearly 200 lurking lift AMRs were introduced to connect warehouse management with automatic line feeding. Materials are associated with production equipment inside the buffer warehouse, then released by the system according to demand. The robot fleet completes accurate retrieval and delivery without operators searching for carts or carrying loads between departments. This turns previously fragmented manual handoffs into a closed-loop process and supports higher delivery efficiency, better traceability, and more stable production rhythm.

How Should a 3C Manufacturer Start an AMR Project?

A practical project begins with the process, not the vehicle. Map the current material routes, record transport frequency, identify waiting and manual handling points, and classify every carrier. Then define which systems create and close each task.

1. Map the current state. Record origins, destinations, materials, carriers, quantities, timing, and operators.
2. Define the target state. Decide which movements will be automated and which manual operations will remain.
3. Standardize interfaces. Align carts, racks, pallets, docking stations, equipment signals, and data fields.
4. Simulate capacity. Test peak workload, route conflicts, charging, waiting, and exception scenarios.
5. Run a controlled pilot. Validate one closed-loop process with measurable acceptance criteria.
6. Expand by process module. Connect additional areas after robot behavior and system interfaces are stable.

The objective is not to maximize the number of robots. It is to create a predictable material flow with the fewest unnecessary transfers, clear inventory status, and enough capacity for production peaks.