BENEFITS

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Installs like a rivet, removes like a screw, with a standard hex key. Cartridge loaded fasteners facilitate rapid placement. Head forming action - from flat to dome - provides superior joint clamp load. Removability allows for rework and heat sink recycling. Placement tooling can place four fasteners simultaneously. Cold formed threads are mechanically locked - no joint loosening due to vibration.

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Setting Sequence

1. RIVSCREW® fastener is inserted into S.E.C. Cartridge / Heatsink assembly. RIVSCREW® rests against the tool nose piece, and a special mandrel (the hex shaped wire drawn through the fastener) ensures no contact is made with the S.E.C. Cartridge PCB.
2. The mandrel is pulled through the barrel of the fastener expanding the RIVSCREW® radially, reforming the internal shape of the fastener from round to hex, and reforming the head from flat to dome.
3. A completed placement - vibration proof and removable.

S.E.C. Cartridge Assembly Machine Overview

The following photographs show the basic Hydra 1000/4 assembly machine, part number MA30796/A. The machine is constructed from extruded Aluminum Alloy sections and is fitted with castors. The operation of the machine is controlled by an Omron QM1-CPU21-E Programmable Logic Controller together with SMC pneumatic valves and actuators. The basic operation of the equipment is described below.

The starting position of the system is:- machine ready for operation with placing tools loaded with fasteners, cycle ready lamp on.

1. The S.E.C. Cartridge is located into the nest.
2. The Heatsink is located onto the S.E.C Cartridge.
3. The operator depresses the two opto-touch palm buttons and the automatic assembly sequence commences with the nest clamps closing onto the component.
4. The nest and components are lifted by a vertical slide to a position where the four RIVSCREW® (Part number 1712-3510) enter into the holes and a closing force is applied to the joint.
5. The fasteners are installed simultaneously by the four hydraulically actuated placing tools. The broaching cycle is monitored by sensors to ensure that correct placement has taken place within pre-determined parameters.
6. The vertical slide retracts lowering the nest and assembled parts away from the placing tools.
7. The next fasteners are fed forward through the split nose jaws and a soft set action pulls the fastener to the face of the nose jaws. The clamps are released completing the assembly sequence.
8. The operator removes the S.E.C. Cartridge assembly.

A light guard is fitted to protect the operator from moving parts by stopping the automatic sequence at any point should the operator place their hands into the working area of the machine.

The four placing tools are reloaded by releasing a latch and rotating the tools to a horizontal position - thus presenting the nose equipment towards the operator.

The tail jaws that retain the mandrel within the placing tool are released and the operator removes the four empty mandrels and follower springs. The follower springs are removed and the mandrels replenished with a fresh pod of fasteners. The follower springs are slid back onto the mandrels which are then fitted back into the tools.

The tools are rotated to the vertical position and the latch locks the tools in the correct position for subsequent operation.

4 Head Machine

Pneumatic requirements:

• Inlet pressure 70 to 100 psi - dry air supply pre-filtered to 40 micron level.

Electrical requirements:

• USA - 110 volts 60 Hz three phase supply.
• UK - 230 volts 50 Hz single phase supply.
• As needed locally.

Bill of Material

RIVSCREW® Placement Equipment - S.E.C. Cartridge

Preventative Maintenance Schedule for Four Head Machine

The following details the daily, weekly and monthly schedule for preventative maintenance on the four head machine for assembly of the heat sink to the S.E.C. Cartridge.

Daily:

• Inspect mandrels for wear and damage. ( 1 minute)
• Inspect oil reservoir for correct level and cleanliness of oil. ( 1 minute)
• Inspect follower springs for wear and damage. ( 1 minute
• Inspect front jaws for wear and damage. ( 1 minute)
• Clean lens of light curtain by wiping with clean dry cloth. ( 1 minute)
• Actuate machine and break light curtain beam to interrupt cycle. ( 1 minute)

Weekly:

• Check all mechanical connections and tighten as needed. ( 5 minutes)
• Check all hoses and hydraulic connections for leaks. ( 5 minutes)
• Check alignment of placing heads with a component in place. ( 2 minutes)
• Check and record machine cycle count. ( 1 minute)
• If machine has cycled more than 15,000 times then go to monthly

Monthly or 15,000 cycles:

• Remove tail jaw assembly for examination and cleaning. ( 20 minutes)
• Remove front jaws for examination and cleaning. (10 minutes)
• Remove cursor assembly for examination and cleaning. ( 5 minutes)

The steps involved and tools required to carry out these procedures will be included in the maintenance and operations manual. Please advise if you have any questions or concerns.

RIVSCREW® vs. Clips

Heatsink to aluminum plate applications:

• Clips do not spread thermal grease as consistently as RIVSCREW®, resulting in higher running temperatures, and shorter component life.
• The clamp load offered by clips is lower than RIVSCREW®, resulting in higher running temperatures, and shorter component life.
• Clips can come loose as a result of a drop test.
• Clips are weaker in shear compared to RIVSCREW®.
• Clips have a lower tensile strength compared to RIVSCREW®.
• Clips must be manually installed.
• RIVSCREW® can be placed at a rate of 1500 per hour.
• Four RIVSCREW® can be placed simultaneously, reducing operator dependent activities

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