Autoriv automatic system cnh for horizontal assembly of clinch nut rivet nut in press. Press automation module for punching forming tool transfer progressive die.

In-Die System for Horizontal Installation of Clinch Nuts and Rivet Nuts

Assembly under the press in punching and forming tools

The setting head CNH (Clinch Nut Horizontal) is a fully automatic in-die installation system for clinch nuts and rivet nuts. The system is suitable for progressive dies and transfer dies. The punching head is installed in the press to insert such fasteners into sheet metal parts horizontally to the punching direction during the press process.

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sheet metal component with clinch nut and spacer processed with setting head cnh
Combination of clinch nut and spacer at an angle of 90 degrees to the punching direction in sheet metal part (stiffening girder)

Advantages of the System

Due to its special design, the setting head is very easy to integrate into tools when fasteners cannot be set in or against the punching direction. The necessary motions are minimal and thus the space requirement is significantly reduced compared to other systems.

Low proportion of moving parts ensures that wear is minimal and the uncomplicated process without actuators reduces the susceptibility to faults to a maximum.

All important functions in the setting head are sensor-monitored with communication to the feeding system to stop the press in case of a malfunction well before top dead center (TDC) and thus avoid die damage.

The feed cylinder only moves to the setting position when a clinch nut is to be installed. Transfer die: If there is no workpiece, the feed cylinder does not move to the setting position. It moves when a workpiece is present. The empty part sensor is either in the transfer grippers or in the tool itself. Coil change: When a coil change is required, the feed cylinder remains in the home position and the coil can be retracted as if there were no setting head installed in the tool.

Pulse shot - Several clinch nuts are shot into the setting head from the feed system and not one after the other. This allows high processing speeds to be achieved, even with long shot hose lengths.

The setting head has quick-release couplings for the shot hose and the multifunction hose for communication with the feeding system. There is no need to connect individual cables. This saves time and eliminates connection errors.

Functionality

automatic system cnh for assembly of clinch nut rivet nut in press
Horizontal assembly of clinch nuts in the press tool

Setting process

The punching head is connected to the associated feeding system for press applications and is supplied with clinch nuts via a shot hose. When an clinch nut is in the setting position and the slider has been retracted to the home position, a release signal is sent to the press. Without a release signal, the press stops.

Main process

The main process co-ordinates the part request to the feeding system. It ensures that the clinch nuts are moved to the setting position on time and monitors the press strokes by interrogating the press cams.

automatic system cnh for assembly of clinch nut spacer in press
Horizontal assembly of a clinch nut and spacer combination in the press tool

Pressing

The clinch nut is shot in and held in the retainer. When the plunger is in the home position, the fastener is ejected. The clinch nut is pressed into a sheet metal part from the setting position. If no workpiece is present during a press stroke, blank sensing allows the slider to remain in the home position. This prevents a clinch nut from moving to the setting position, and the press performs the stroke without clinching a nut.

Air supply

A pneumatic connection on the feed system transfers compressed air to the setting head. This connection supplies the permanent air and the pneumatic cylinder for the slider.

Components

setting head automation module cnh components
1. Connector plug; 2. Coupling; 3. Plunger (press-in mandrel); 4. Accumulation path; 5. Feed cylinder; 6. Multifunctional hose connector

Connector plug (1)

The connector plug is used to connect the shot tube to the setting head.

Coupling (2)

The coupling serves as a connection between the shot hose and the guide unit.

Plunger (3)

The clinch nut is pushed out of the setting position by a plunger by moving onto the plunger. The plunger is either spring returned or permanently pneumatically returned. The plunger is permanently attached to the press tool and is separately controlled.

Accumulation path (4)

The setting head includes an accumulation path. It is used to store additional fasteners in the punching head to compensate for feed fluctuatons. The permanent air is used to move the clinch nuts to the setting position. When the shot air is active, the permanent air supply is briefly interrupted so as not to work against it. When the press is inactive, the permanent air is switched off. The accumulation path ensures consistent production.

Feed cylinder (5)

The feed cylinder pushes the clinch nut into the setting position by means of a slider. The slider is retracted to the home position after transporting the fastener.

Multifunctional hose connector (6)

All signals are transmitted from the setting head to the feeding system via the multifunctional hose. The multifunctional hose also provides pneumatic supply to the punching head.

Technical Data

Installation width: 50 / 60 / 70 / 80 mm

Pneumatic supply: 6 bar from feeding system

Control voltage: 24 V / DC from feeding system

Press-in force / path: Tool-dependent

Cycle time: Up to 40 cycles/min*

Interfering edge / Possible component depth: According to customer requirements

Working direction: Horizontal

 

*Depending on the fastener and length of the shot hose.

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