Mini Frangibolt

Mini Frangibolt 2017-09-18T00:41:10+00:00

SEE HOW IT WORKS!

TiNi’s mini Frangibolt is based on a #4 size screw and we believe is the smallest, simplest, and most powerful Actuator (considering its size) available in the world today. Once again, the enabling technology is our SCSMA material which provides 3x the stroke of commercially available SMAs. TiNi has been manufacturing these FD04 size Actuators for Cubesat and other applications since 2005 and can readily scale production to meet commercial demand.

TiNi MINI-FRANGIBOLT ACTUATORS OFFER THE FOLLOWING ADVANTAGES:

NEA (Non-Explosive Actuators)
 – As with all TiNi products, the Mini-Frangibolt is non-pyrotechnic and field reset-able with a minimum qualified life of 60 cycles.

Easy to Reset & Simple to Use – 
The actuator is reset by the customer in a matter of seconds (i.e. no need to ship back to TiNi). This enables numerous system level testing to be performed prior to flight usage to ensure maximum reliability.

Scalable Design – The same design can be scaled up to a #6 size screw for added strength, or down to a tiny #2 size screw for an even smaller Actuator. Metric sizes available upon request.

Safe to Use and Operate – 
The Frangibolt does not pose any safety concerns to personnel, is low shock, and insensitive to ESD (Electro-Static Discharge).

Cost Efficient – TiNi has been manufacturing these Actuators for Cubesat and other applications for approximately 10 years now and has streamlined production to be able to produce them at a fraction of the price of traditional non-pyrotechnic release devices.

Mini Frangibolt Options

ACTUATOR FD04 7 Volts

The FD04 size Frangibolt Actuator is designed to operate with a TiNi supplied #4 size Titanium Fastener (see below). These have a nominal tensile strength of 630 lbf (2,802 N) and are recommended for use in bolted joints which require up to 150 lbf (667 N) of preload. As with all TiNi products, key attributes include:

Features:

  • Non Pyrotechnic and Field Reset-able
  • Redundant Firing Circuit,
  • Maximum Reliability Thru
    • Design Simplicity
    • Pedigree, and
    • Testability

    * TiNi Aerospace must provide the specially notched Titanium fastener. This is largely application dependent and is readily manufactured to customer specification.

Function Time at Various Temperatures

Nominal values for estimation purposes only. Actual function time depends on application (joint) design and circuit used (primary or secondary).

FD04 7 Volts Details

Specification subject to revision. Contact TiNi Aerospace for detailed ICD (Internal Control Drawing).

ACTUATOR FD04 7 Volts With RTD

The FD04 size Frangibolt Actuator is designed to operate with a TiNi supplied #4 size Titanium Fastener (see below). These have a nominal tensile strength of 630 lbf (2,802 N) and are recommended for use in bolted joints which require up to 150 lbf (667 N) of preload. As with all TiNi products, key attributes include:

Features:

  • Non Pyrotechnic and Field Reset-able
  • Redundant Firing Circuit,
  • Maximum Reliability Thru
    • Design Simplicity
    • Pedigree, and
    • Testability

    * TiNi Aerospace must provide the specially notched Titanium fastener. This is largely application dependent and is readily manufactured to customer specification.

Function Time at Various Temperatures

Nominal values for estimation purposes only. Actual function time depends on application (joint) design and circuit used (primary or secondary).

FD04 7 Volts (w RTD) Details

Specification subject to revision. Contact TiNi Aerospace for detailed ICD (Internal Control Drawing).

ACTUATOR FD04 12 Volts

The FD04 size Frangibolt Actuator is designed to operate with a TiNi supplied #4 size Titanium Fastener (see below). These have a nominal tensile strength of 630 lbf (2,802 N) and are recommended for use in bolted joints which require up to 150 lbf (667 N) of preload. As with all TiNi products, key attributes include:

Features:

  • Non Pyrotechnic and Field Reset-able
  • Redundant Firing Circuit,
  • Maximum Reliability Thru
    • Design Simplicity
    • Pedigree, and
    • Testability

    * TiNi Aerospace must provide the specially notched Titanium fastener. This is largely application dependent and is readily manufactured to customer specification.

Function Time at Various Temperatures

Nominal values for estimation purposes only. Actual function time depends on application (joint) design and circuit used (primary or secondary).

FD04 12 Volts Details

Specification subject to revision. Contact TiNi Aerospace for detailed ICD (Internal Control Drawing).

ACTUATOR FD04 12 Volts With RTD

The FD04 size Frangibolt Actuator is designed to operate with a TiNi supplied #4 size Titanium Fastener (see below). These have a nominal tensile strength of 630 lbf (2,802 N) and are recommended for use in bolted joints which require up to 150 lbf (667 N) of preload. As with all TiNi products, key attributes include:

Features:

  • Non Pyrotechnic and Field Reset-able
  • Redundant Firing Circuit,
  • Maximum Reliability Thru
    • Design Simplicity
    • Pedigree, and
    • Testability

    * TiNi Aerospace must provide the specially notched Titanium fastener. This is largely application dependent and is readily manufactured to customer specification.

Function Time at Various Temperatures

Nominal values for estimation purposes only. Actual function time depends on application (joint) design and circuit used (primary or secondary).

FD04 12 Volts (w RTD) Details

Specification subject to revision. Contact TiNi Aerospace for detailed ICD (Internal Control Drawing).

ACTUATOR FD04 14 Volts

The FD04 size Frangibolt Actuator is designed to operate with a TiNi supplied #4 size Titanium Fastener (see below). These have a nominal tensile strength of 630 lbf (2,802 N) and are recommended for use in bolted joints which require up to 150 lbf (667 N) of preload. As with all TiNi products, key attributes include:

Features:

  • Non Pyrotechnic and Field Reset-able
  • Redundant Firing Circuit,
  • Maximum Reliability Thru
    • Design Simplicity
    • Pedigree, and
    • Testability

    * TiNi Aerospace must provide the specially notched Titanium fastener. This is largely application dependent and is readily manufactured to customer specification.

Function Time at Various Temperatures

Nominal values for estimation purposes only. Actual function time depends on application (joint) design and circuit used (primary or secondary).

FD04 14 Volts Details

Specification subject to revision. Contact TiNi Aerospace for detailed ICD (Internal Control Drawing).

Frangibolt Accessories

MINI FRANGIBOLT RESET TOOL

TiNi Mini Frangibolts are rated to have a minimum life of 50 cycles. For continued testing and preparation for final installation, TiNi provides a mechanical reset tool as shown which will generate the force and stroke required to compress all Mini Frangibolts styles.

Compression of the Mini Frangibolt actuator is a simple 3 step process: First, install the unit in the fixture using the adapter provided. Second, tighten the drive screw using a torque wrench until the specified torque value as indicated on the reset tool has been reached.  Third back off the drive screw and remove the actuator.  The whole process may be carried out in less than 30 seconds. Furthermore, the size and weight of the Mini Frangibolt Compression Fixture make it fully portable allowing easy transport.

FASTENERS

The #4 Fasteners used in the Mini Frangibolt release system are an integral part of the mechanism.  Significant amount of testing was performed to derive the optimum material, notch profile and notch diameter. These features must remain constant for all applications. The customer typically specifies the Fastener type, grip and thread length as well as the notch location. TiNi Aerospace Fasteners are manufactured per strict tolerances and procedures involving both individual and lot-level testing and inspection.

The picture below illustrates some of the more common Fastener configurations that have been successfully used across all Frangibolt sizes including Mini Frangibolt. Each suits a different type of Frangibolt joint design and lends enormous versatility to this unique product.

*Fasteners are made from 6AL-4V Titanium per AMS 4965 with a minimum tensile strength of 160 Ksi (1104 MPa) Note: All values are approximate and for reference only. Contact TiNi Aerospace for detailed ICD (Internal Control Drawing).

Fastener Examples

WASHERS

The Washers used in the Mini Frangibolt assembly are an important part of the mechanism. They serve the following critical functions:

  • They distribute the relatively high recovery stress generated by the SCSMA cylinder during actuation, on a much larger contact area.
  • G10 washers provide thermal isolation and it is highly recommended to install between Mini Frangibolt and the structure.
  • They have minimum thickness so as to minimize the overall length of the joint.
  • They have chamfers specially designed to match fillet radiuses of NAS bolts (at the location where the bolt head meets the bolt shank).
  • They have tighter fitting inner diameters designed to clear NAS bolt shanks while at the same time maximizing coverage of the SCSMA cylinder.

Product Details

*Note: All values are approximate and for reference only. Contact TiNi Aerospace for detailed ICD (Internal Control Drawing).

LOCK NUTS

Custom lock nut shown on this page have been widely used with the Mini Frangibolt release mechanism. They offer the following key features:

  • They are made from Solution Treated and Aged Titanium  6AL-4V STA.
  • They have locking helicoil inserts made out of  304 stainless steel with a minimum tensile strength of 74 ksi.
  • They have a washer face for more even  load distribution.
  • They offer a higher profile than other NAS nuts thereby increasing the number of threads engaged and reducing the stress in the thread.

Note that not all Mini Frangibolt designs require a nut as many thread directly into a flange or structure. In this case, it is important that the threaded connection be designed to withstand the tensile strength of the notched Frangibolt.

*Torque specification is recommended value above running.
Note: All values are approximate and for reference only. Contact TiNi Aerospace for detailed ICD (Internal Control Drawing).

ENCLOSURE

The enclosure shown is a generic design meant to show how the Frangibolt can be held down and retained after actuation. This is done using a thin walled aluminum housing which is held down using a low profile ring. Note that making these 2 parts as separate pieces allows the enclosure to be rotated into the exact position desired for each application. A third component in the form of a silicon rubber dampener is incorporated inside the can to avoid metal on metal impact during actuation.

In many cases a separate enclosure (as shown) is not necessary because such a means can be designed directly into the releasable joint.

*Note: All values are approximate and for reference only. Contact TiNi Aerospace for detailed ICD (Internal Control Drawing).

SWITCH WASHERS

The Switch Washer is a combination Switch and Washer developed as a simple means of determining when the Frangibolt has functioned. It comprises of a top and bottom bearing surface, internally mounted spring, and a pair of mating electrical contacts. The spring is preloaded to generate more than 3 lbs of force to keep the top and bottom surfaces separated thereby firmly biasing the switch to the Open position. However, once installed on a bolted joint and tightened to the prescribed torque, the top and bottom surfaces are brought together closing the switch contacts and preloading the Mini Frangibolt joint assembly. The switch contacts remain closed until the Mini Frangibolt releases the tension by breaking the bolt during actuation. At this time, the  spring once again returns the Switch back to the Open position within a fraction of a second.

The Switch-Washer may be used in one of two ways: It can be wired in series with the Mini Frangibolt actuator to act as an automatic shut-off switch, or it can be wired as part of a separate circuit to serve as a feedback loop to a controller.

*Note: All values are approximate and for reference only. Contact TiNi Aerospace for detailed ICD (Internal Control Drawing).

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