Tigh­tening Technique

Effi­ci­ent, dura­ble and repeatable

Tigh­tening Technique

Manual and Auto­ma­ted Screw­dri­ving Solutions

DSM provi­des high-perfor­mance elec­tric screw­dri­ving systems for indus­trial assem­bly – from ergo­no­mic hand­held nutrun­ners to statio­nary tigh­tening solu­ti­ons with precise built-in nutrun­ners for semi- and fully auto­ma­ted applications.

Our systems stand out through modu­lar design, a wide variety of confi­gu­ra­ti­ons, and maxi­mum process reliability.

Whether used manu­ally or inte­gra­ted into a statio­nary setup: with various drive and output modu­les and a broad torque range, we offer tail­o­red solu­ti­ons for nearly any tigh­tening task.

Bene­fit from proven tech­no­logy that can be precis­ely adapted to your requirements.

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Basic Prin­ci­ples of Tigh­tening Technology

Tigh­tening tech­no­logy is a gene­ric term encom­pas­sing tools, systems, machi­nes and compon­ents used in the manu­fac­tu­ring of detacha­ble screw connec­tions.

What is a screw connection?

A screw connec­tion consists of compon­ents that are held toge­ther thanks to the assem­bly prel­oad force with the help of:

  • Screws
  • Nuts
  • Blind rivet nuts
  • Bolts

Tigh­tening tech­no­logy includes proces­ses like screw feeding, screw posi­tio­ning as well as the rota­tio­nal and feed move­ments of the tool while tightening.

These func­tions make tigh­tening tech­no­logy tools widely appli­ca­ble in the manual, semi-auto­ma­tic and fully auto­ma­tic assembly.

Further it can also be used in the final assem­bly stages in manu­fac­tu­ring and proces­sing indus­tries.

Another important aspect is the poten­tial for non-destruc­tive disas­sem­bly for post-proces­sing, repairs or main­ten­ance.

This is how it works

Screw connec­tions are secu­red through the static fric­tion of the thread and addi­tio­nal screw-locking elements.

The main focus of tigh­tening tech­no­logy is to deter­mine and set the appro­priate assem­bly prel­oad force for the screw connection.

To achieve that goal the torque and angle of rota­tion need to be calcu­la­ted correctly.

Drive

An elec­tro­ni­cally commu­ta­ted motor (EC motor) serves as the drive.

It enables the calcu­la­tion of torque and angle of rota­tion using the motor control para­me­ters or torque and angle of rota­tion measurements.

4 Advan­ta­ges of Elec­tro­ni­cally Opera­ted Tigh­tening Technology

As oppo­sed to pneu­ma­tic tigh­tening tech­no­logy, elec­tro­ni­cally opera­ted tigh­tening tech­no­logy is not depen­dent on the avai­la­bi­lity of compres­sed air.

Further advan­ta­ges include flexi­bi­lity, process relia­bi­lity, torque accu­racy, and the ability to provide seam­less documentation.

Flexi­bi­lity

Thanks to the EC motor and EC tigh­tening tech­no­logy, it is possi­ble to freely adjust para­me­ters such as speed, torque, angle of rota­tion, direc­tion of rota­tion and screw-in depth.

This allows every scre­wing process to be modi­fied at any time.

Also, an adapt­a­tion to new requi­re­ments is always possible.

Process Relia­bi­lity

EC tigh­tening systems can iden­tify, evaluate and docu­ment the assem­bly process.

Torque results can be measu­red and evalua­ted through inde­pen­dent sensors.

This is espe­ci­ally important when assembling safety-criti­cal components.

Torque Accu­racy

Torque accu­racy is deter­mi­ned by the criti­cal machine capa­bi­lity index Cmk (capa­bi­lity machine katayori).

It indi­ca­tes the ratio between tole­rance and process spread of the machine.

The calcu­la­tion also takes into account a devia­tion of the process mean value from the tole­rance center.

Usually an ability exami­na­tion is conduc­ted, using a sample of 50 parts from a short produc­tion period.

Inte­gra­ted Documentation

Unlike pneu­ma­tic nutrun­ners, elec­tro­ni­cally opera­ted systems typi­cally record torque and angle values auto­ma­ti­cally as a stan­dard feature. This enables seam­less process docu­men­ta­tion and impro­ves tracea­bi­lity for every fastening operation.

Hand­held EC Nutrun­ners: Torques from 0.05 Nm to 60 Nm

Our hand­held EC nutrun­ners meet all requi­re­ments needed for a relia­ble assem­bly process.

Their compact and ergo­no­mic design is perfect even for low torques.

Addi­tio­nally, the highly accu­rate torque sensor accom­pa­nied by the DSM control system allows diffe­rent tigh­tening proce­du­res to be carried out secu­rely and accor­ding to quality requirements.

Thanks to the ergo­no­mic­ally shaped handle bar (5), the nutrun­ner lies comfor­ta­bly in the hand, enab­ling barrier-free usage of the freely confi­gura­ble control buttons (7).

The arran­ge­ment includes a program selec­tor switch for swit­ching between programs and a start button to initiate the selec­ted program.

A status indi­ca­tor (2) inte­gra­ted in the handle displays the status of the tigh­tening process: green indi­ca­tes a proper fastening, yellow indi­ca­tes an ongo­ing process and red indi­ca­tes a faulty fastening.

The measu­ring unit (4) within the handle is for measu­ring and control­ling the torque and angle of rotation.

At the end of the handle there is a connec­tor (1) for the elec­tro­nic selec­tion and moni­to­ring of the drive.

When using vacuum screw holders, the connec­tor also includes the air or vacuum connec­tion for an opera­ting pres­sure of six bar.

Addi­tio­nally, an inte­gra­ted EC conver­ter (3) ensu­res quick system inte­gra­tion and error-free setup.

Acting as decen­tra­li­zed intel­li­gence it trans­fers charac­te­ristic data via plug-and-play.

Tigh­tening opera­ti­ons can be perfor­med even in dim light because of the addi­tio­nal light­ning (8) loca­ted above the drive unit (6).

Handheld EC Nutrunner Setup

Built-In EC Nutrun­ners: Torques from 0.05 Nm to 2400 Nm

Our statio­nary screw­dri­ving tech­no­logy with built-in nutrun­ners from the DS series is the ideal solu­tion for error-free and relia­ble produc­tion proces­ses.

The main feature of this series is its compact design thus allo­wing perfect inte­gra­tion into exis­ting or new produc­tion lines.

The built-in EC nutrun­ners are powered by an elec­tro­ni­cally control­led servo motor (2) and trans­fer digi­tal data as well.

As with our hand­held nutrun­ners, an inte­gra­ted para­me­ter memory ensu­res an error-free setup.

Addi­tio­nally, the entire tigh­tening process is control­led, moni­to­red and super­vi­sed through the Multi­Pro 3G control system.

Since not every produc­tion process is the same, we offer our DS series with or without a torque sensor.

Thanks to the moun­ting flange (9), it is also possi­ble to choose between various down­force units (10) such as:

  • Drive offset
  • Stubby drive
  • Angle drive
  • Self-start drive
  • Offset drive

It is also possi­ble to exch­ange them quickly.

An illu­mi­na­ted panel (6) is inte­gra­ted in the housing to show the user the status of the process.

Green indi­ca­tes a properly execu­ted fastening, yellow shows that the process is ongo­ing and red signals there is a fault.

Built-In EC Nutrunner Setup

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