Blog: screw feeding
Deprag's New Adaptive Direct Fastening System is a revolution automatic flow form screwdriving.
The use of flow form screws into two non-drilled sheets requires high down force and high speed to heat and form the hole. It is a complex assembly because to achieve optimal cycle times and proper funnel and thread forming, the down force and feed speed needs adjusted during the various stages of the screw assembly so that the funnel and thread forming can be done reliably.
Traditional systems required numerous pre-tests to determine the timing of the piercing point. Switching parameters too early leads to improper funnel formation and longer assembly times, too late can lead to thread damage.
Deprag's Adaptive DFS is able to sense the exact piercing point as well as other key stages in the screw assembly and switches parameters accordingly assuring:
- automatic adaptation to variances in the screw and part
- the highest process reliability
- shortest possible cycle times
- optimised funnel forming
- reduced set up times
- a more flexible system
- minimise damaged threads
Other features of the Adaptive Direct Fastening System are:
- Active nosepiece jaws that hold the screw firmly until drilling has started
- Adjustable down holder force
- High down pressure applied directly in line with the screw
- Head first screw feeding to minimise damage to the screw’s tip
- Fast interchange of the mouthpiece for minimal downtime
- Lock stroke for underfloor applications
Max Speed: 8000rpm, freely programmable
Max torque: 15Nm, freely programmable
Feed stroke: upto 3000N, freely programmable force and distance
Max Downholder force: 1200N, freely adjustable
Assembly at any angle or upside down.
Complete with industrial PC to set parameters, control the screwdriving and to analyse trends
Dirt or dust particles can cause damage to some products or the system into which the sub-assembly will be integrated.
In these situations it is important to avoid abrasion, reduce abrasion or target its removal! These are the basic requirements for screwdriving assembly in clean rooms to ensure the quality of the components to be processed. The DEPRAG CleanFeed Concept provides an overall solution.
Advantage: Integrated design for technical cleanliness. Deprag’s complete program is coordinated for all required individual components, from the feeder to the screwdriver, semi automatic or fully automatic – all from one source.
Function: The screws are stopped in switch position 1 and the residual dirt is removed from the feed parts via vacuum suction. The removed dirt particles are then collected in a filter with transparent inspection window and a replaceable filter element. In switch position 2 the cleaned connection element is fed into the screwdriving module (inline version) or prepared for pick up (Pick&Place version).
The components below can be used to obtain an optimal result:
- DEPRAG HSF sword feeder – vibration free screw feeding – therefore no component friction and minimal abrasion
- DEPRAG Particle killer – dirt particles from the feeder are targeted and removed in-line
- DEPRAG Clean Pick-and Place unit – Screws are fed to to the pick point in the unit, which also has a vacuum to remove particles
- DEPRAG SFM-V vacuum screwdriving module, which fits onto the screwdriver – residual dirt is removed by suction via an additional vacuum source when positioning the screwdriver.