Logic drawer
The purpose of this apparatus is to control the operational logic of all the axes of the robotic arms, in collaboration with other pull-out containers inside a mechanical chassis that collects and connects them to the actuators and motors.
Product requirements
The initial requirements for the development of the mechanical case of this product were:
- Sturdiness to house electronics weighing approximately 10 kg.
- Easy access to the contents for installation and maintenance.
- There is a sliding mechanism for extraction from the chassis.
- Precision is needed to allow the boards to connect with the rear connectors of the backplane.
- Continuous connection with the chassis to ensure EMS protection of the electronics.
Material selection
The drawer is made of pre-treated laminated steel (Magnelis®) with a thickness of 15 mm, making it ready to use without costly additional galvanizing treatments.
The entire body is made from laminate, cut with fiber laser, and bent using a robotic cell.
The structure is solid and capable of supporting 10 kg of electronics, even with the drawer fully extended.
Handling
Movement is handled via two anodized aluminum handles located on the front, made from an extruded profile with an 8 mm diameter, directly screwed to the drawer.
The drawer’s sliding mechanism was designed to ensure simplicity and cost containment, without using ball bearing guides but instead relying on Teflon membranes applied to slides fixed to the chassis.
To avoid forces or pressures that could deform the front panel housing the connectors, two triangular supports were created to maintain a 90° angle between the front and base, ensuring the safety of the soldered connections on the board.
The drawer can be fully removed from the chassis or left fully extended for complete accessibility without the risk of falling, thanks to a Z-fold serving as a safety stop with a mechanical catch.
Positioning and assembly
In the closed position, the drawer must maintain continuous contact along its entire width with the chassis to ensure homogeneous EMS shielding. For this reason, a compressed counter-fold was created to reinforce and compensate for any errors, ensuring perfect adhesion of the conductive gasket.
The front of the drawer is covered with adhesive polyester and screen-printed with all the necessary graphics for connector identification and company branding.
The application of the polyester is carried out using specific centering equipment with pins and mechanical references to guarantee the correct position and absence of trapped air bubbles.
To ensure better adhesive adhesion, the mechanical components undergo an industrial washing cycle after the cutting and bending processes to eliminate residues of oils and dust.
Complete product supply
The product is supplied complete with all assembled components, ensuring that the customer only needs to handle the electronic part of the device and the testing phase.
Shipping is done in certified ESD boxes, allowing the product to be introduced directly into the production system for subsequent stages while preserving the other electronic components from harmful static currents.
Materials and technologies used
This system consists of 6 different materials:
- Pre-treated steel (Magnelis®) with a thickness of 15 mm for the drawer body.
- Galvanized steel for the fasteners securing the electronics.
- Brass for the spacers used in securing the screen protector.
- Transparent VIVAK polyester for the screen protector.
- Polyester with printed graphics for the front label.
- Extruded aluminum alloy 6060 for the handles.
The result was achieved using 9 different technologies: extrusion, profile cutting, deburring, laser cutting, bending, fastener application, turning, screen printing, and final assembly.
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