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Presentation - Bollhoff Attexor SA
Portable SPOT CLlNCH® machines
The very wide range of c1inching hand tools and portable machines offers the opportunity to incorporate c1inching into your operation for a minimum investment cost and to provide the best solution for practically every application
A complete SPOT CLlNCH® hand tool system is composed of the following parts:
Work head: design depends on the model selected for the particular range of applications.
Tool kit: suited to the application
Rotating suspension, by means of rotating ring or a complete gyroscopic suspension
*Air-to-Oil pressure booster with 1 :60 ratio. N.B. The booster is not needed for the IP series which are 100% pneumatic.
*Pack of 2 m flexible hoses (hydraulic and pneumatic hoses in safety sleeve), with a 3 m variant
*Balancer, depending on the weight of the work head
*Optimized Cycle Controller (OCC) for fast and automatie clinch cycle
An electronic, "smart", process controller can be used to check the joining pracess for automated or mass production. The signals from a force sensor, installed on the C-frame, in conjunction with a displacement sensor measuring the tooling position, yield a force-displacement curve in real time for every clinch joint. The software allows check "windows" to be programmed along the curve, the last one being the final value of the completed joint. If the signal deviates from the reference windows, an error signal can be sent to the line controller or to the robot to stop the machine and for statistics analysis.
Design af the segmented die body
The SPOT CLlNCH® die comprises a basic die body and individual die segments, which are held in position by a steel spring. A surrounding cage permanently secures the separate sections to the die body preventing them from falling out. The die cavity can be formed by 2,3 or 4 segments with die designs being selected depending on the application requirements
The stripper has two essen¬tial functions: keeping the sheet metal flat while clin¬ching and pushing the sheet metal out of the punch during the return motion of the tooling. A number of standard strippers are available, given that ac¬cessibility conditions may vary for each application. Special executions may be supplied if necessary.
Compatibility of tooling with the machine
The SPOT CLlNCH® work heads are designed to accommo¬date the various standard tooling. A corresponding force unit with appropriate setting force exists for each die diameter. This makes it quite simple to select the clinching machine. Irrespective of the die diameter or width, a suitable work head is available in the portable or in the modular range.
Tool selection based on clinch area and materiel thickness
The main parameter for selection is the clinch area, in general defined by the edge of the sheet metal wall. The width or the diameter of the die must match the edge width (A) so that the die's outer dimension is at least equal to the sheet metal edge. On punch side, the limiting dimension will be the width of the stripper front piece. A special stripper front piece may be provided in case of limited access.
Clinching general principles
The clinching process is a method of joining sheet metal by localised cold¬forming of the materials. This produces an interlocking joint between two or more layers of material.
Coated and painted sheet metals can also be joined together without altering the surface finish.
The SPOT CLlNCH® joining technique can be used to join steel and stainless steel materials as well as aluminium and/or non-ferrous materials based on a cost effective, environmentally friendly process.
Depending on the SPOT CLlNCH® joining tool selected, the resulting clinch will either be round or rectangular.
The SR round joint, without cutting through the material, is gas tight. Conse¬quently, it protects the coating better and provides high corrosion and fatigue resistance.
The ST rectangular clinch joint is the product of a combined cutting and deforming process. It is primarily suited to multi-Iayer (up to 5 and more) and harder materials such as stainless steel.
The advantages of the SPOT CLlNCH® Joining Technique
Joints can be checked without damage
No consumable items . Low energy use
No thermal load on joining zone
No damage to surface finishes on the work piece
Low maintenance costs
Interim layers of film or adhesive can be incorporated in most cases
Very good joint reproducibility
Environmentally friendly workplace
No fumes, no sparks, very little noise
No pre/post treatment required, e.g. no pre-cleaning or subsequent removal of spray deposits around the joint
The Clinch Joint
In the SPOT CLlNCH® joining process, the materials to be joined are firstly forced into the die with the punch. As soon as the lowest material is resting on the die anvil, it starts flowing sideways under the pressure being exerted by the punch. The movable die sections are pushed outwards and the flow of material forms the button-like joint. The punch is then returned to its starting position by the operator or by a pneumatic timer which removes the force. The joined part can now be removed and the side sections of the die are pulled back together by a spring.
The SPOT CLlNCH® joining system can be incorporated into existing press systems or custom built machines. It can be used to simultaneously set one or several points and can be integrated within manual machines and robotic equipment and systems.
Influential variables on the quality of a clinch Joint
Compared with other joining techniques, clinching is characterized by 4 essential parameters:
Material ductility: in general, the required ductility values are 20% for a rectangular (partial cut) joint and 30% for a round joint.
Access from both sides: needed for pressing the material between the punch and the anvil
Setter joint feasibility and strength with the punch on the thick side, when joining sheet metal with different thicknesses
Once the joint is formed, the most relevant parameter is the residual bottom thickness, "SC which is directly related to the interlocking effect and consequently the joint strength.
Clinch Joint parameters and control
The SPOT CLlNCH® joint can be easily tested without being damaged, by measuring the residual base thickness, "St" and the joint diameter "D" on the die side of the joint.
These values are predetermined in laboratory tests for each application and recorded, with a test number, in a report. These parameters will be subsequently measured during production and compared with the reference data, thus guaranteeing reliable quality control of the SPOT CLlNCH® joint.
The residual base thickness, "St. is measured by hand using a calliper, as shown in the photograph. This allows quality checks to be carried out on random samples without interrupting production.
Strength value of SPOT CLlNCH® Joints
The shear and the cross-tension strength are a good means of comparing clinching with other joining methods such as spot welding, riveting or screwing. The graph on the right hand side shows the most current values for the standard tooling and mild steel.
Static shear tensile strength depending on sheet thickness
Material: steel plate
Strength = 300 N/mm2
SR 504, Ø 5 mm
SR 804, Ø 8 mm
a. ST 432, placed transverse to load direction
3.b. ST 432, placed longitudinal to load direction
There is a directional dependency involved when making a rectangular joint (ST). To achieve a greater strength, the load direction in the case of the rectangular joint should be transverse to the joining element, (3a) in the graph, rather than longitudinal (3b). The graph above also shows that the widening the joint diameter (1 to 2) also increases in strength.
The SPOT CLlNCH® tooling family
The central component of the SPOT CLlNCH® joining system is the tooling, or "tool kit'. These are available for round clinch joints with nominal diameters of 3,4,5,6,7,8 and 10 mm and rectangular point joints with nominal widths of 3, 4, 4.3, 5 and 6 mm. Non standard dimensions are generally available from diameters of 1.0 to 10 mm .
A multiple tool holder can be used to integrate tool sets into corresponding SPOT CLlNCH® portable units, modular work heads or a press.
Criteria for selection
Selecting the tooling is the first step involved when studying a new c1inching application, because it will determine the pressing force and therefore the size of the c1inching force unit and work head. This choice will depend on:
Sheet metal thickness and material: each tooling has its own range of thickness per material type.
Accessibility and space allowed for the tooling: the thicker the material, the larger the tooling required.
Strength requirement: there is a direct relation between the size of the tooling and the joint strength. Priority can be given to obtai¬ning either the highest strength, or minimizing the cost of the equipment by selecting a smaller tooling.
Punch location: whenever possible, the punch should always be on the thicker layer, which will provide a higher joint strength.
Number and variability of sheet layers: a rectangular tooling should be selected if a low ductility material is used or if more than 2
layers, unequal thicknesses or variable total thickness are involved in the same application.
ATTEXOR Clinch Systems provides optimized and advanced c1inching solutions for specific industries, notably:
Micro clinch tooling, which have been used in the electronic and watch industries for 15 years, with a small record die diameter of 1.0 mm
Tooling for electric contacts, with diameters ranging between 2 to 3 mm
Tooling for filters, ST402, accepting high filtering fabric material thickness in the ventilation industry
Tooling for ventilation ducts, which enables fast lateral displacement of machine
Installation of a portable clinching machine
The booster and the balancer should be installed on a combined running cradle to avoid collisions, while maintaining the suspension cable of the work head perfectly vertical over the whole work zone.
The air supply must be dry, filtered and regulated, with a minimum size of '12" for ensuring the shortest possible cycle time.
All the SPOT CLlNCH® systems are designed for operation without lubricator on the air preparation unit.
How to select the machine
Once the tooling has been selected (see page 4) the choice of the work head will be dictated mainly by the geometry of the product to be clinched, and by accessibility to the clinch area.
Small edges: the examples here show as¬sembly of the external edges of cabinets, housings and walls of large size products. This choice is advantageous given the high speed, light weight and the mobility of the tool which offers exceptional productivity.
Medium range: the assembly of profiles or folded edges which require a larger jaw opening. The quick and safe closing jaw of the IP models is a perfect solution for such products.
Large structures: it is quite often necessary to set the clinch joint further away from the edge, or for passing over steps. Working from the top of a product or accessing a more confined box is often necessary. This type of machine is the best solution in this case as various C'frame dimensions and geometries can be supplied using the same force unit.
Portable SPOT CLlNCH® machines
FS Series [booster driven): light and fast hand tools
- Light weight and fast tools for joining edges and flat panels Convenient for cabinets, refrigerated window displays, vending machines, freezers,
ventilation and many other sectors.
IP Series, 100% pneumatic, quick locking jaws
- Multi-purpose, jaw type c1inchers, ideally suited for applications with medium distance to access the joint. Wide opening with safe pre-stroke, by manual or automatic fast closing of the work head (patents pending). Many sectors of applications with building components, ventilation ducts, HVAC (Heating, Ventilation and Air-Conditionning), appliances, automobiles, etc.
PASS Series - [-frame type, multi-purpose, large size work-heads
- Portable, powerful tools, hydraulically powered by compressed air boosters. Multi-purpose C'frame type work head family, equipped with the unique PASS
(Passive Approach Stroke System) option. The pre-stroke is pneumatic and can be activated independently of the work stroke, for a safe, long approach stroke and for easy tool positioning. Wide range of C'frame dimensions with depths up to 450 mm, for application in all industries, large assemblies and cabinets.
SPOT CLlNCH® Modular systems for integration and automation
The modular program is intended for line builders and integrators and for people requiring efficient tools which enable rapid creation of customized solutions and suited to a wide variety of clinching assembly tasks. The solutions can involve bench mounted or stand alone machines, special assembly work stations, automatic assembly lines or robot stations. The systems are composed of cost effective standard hydraulic work heads, powered by air-to-oil pressure boosters simply connected to compressed air, for unlimited combinations of force unit capacity, stroke length, C'frame depth and work heads.
Multiple work head stations can be easily designed and built with pre-adjusted components, and without the use of a complicated electro-hydraulic power installation, and can be immediately operational. The limited oil volume also prevents large oil leakages and the inevitable dirtiness of usual hydraulic installations over time.
Once the tool kit type, dimension and setting force are defined as fonction of the application (see page 3 and 4). there will always be the right work head to power it and to build the c1inching installation.
Accessories include boosters, tool holders, punch strippers, die protections, compensated supports for adaptation to automatic operation, hand triggers and foot pedals, various sensors for automatic control, optimized cycle controller and process monitoring device for full production control. Some portable applications are also based on modules, with the aid of accessories like balancers and gyroscopic suspensions with appropriate load capacity.
The PASS solution far long strake
As described on page 6 for portable machines, a long pre-strake can be provided by a small pneumatic cylinder, which eliminates the need for large oil flows. Therefore only one pressure booster can power several work heads by just acting during the work stroke. Another advantage of the PASS solution is to save cycle time when making several clinch joints in a raw without having to activate the long approach and return strokes. Each module range, from 35 kN to 300 kN, can be equipped with the PASS option.
The usual modular installation comprises one or several work heads, mounted on sliding (compensating) sup¬ports, and powered by a booster. The work piece must be introduced automatically or manually in-between the punch and the die, without hurting the tooling or the tool holder. Prior to the c1inching cycle, the work head is moved on its sliding sup¬port until the part comes into contact with the tooling attached to the C'frame side. In this way the cycle is operated smoothly without any distortion to the c1inched part or to the c1inching tooling and work head.
Robotic PASS work heads
New range of compact c1inching machines with integrated pneumatic-hydraulic force unit for use as:
Bench mounted (manually operated)
Automatic lines (integrated c1inching heads)
Simply powered bya 6 bar (85 psi) air compressed air line, they offer exceptional performance in terms of cycle time (up to 80 joints per minutes), of energy saving (the full power is only activated during the minimum work strake), of flexibility (with a pre-stroke of 52mm (2") for easy accessibility, and of possibilities of various pre-installed sensors for process contra!
SPOT CLlNCH® Modules
The work heads are grouped according to their maximum joining force.
Series SC P35 / P50 S with 35 or 55 kN joining force, light C' frames, all possible dimensions up to 1300 mm are available. The PASS option is available for all modules. It uses standard tool kits: see corresponding setting force and sheet metal thickness on page 4.
Series SC P75 / P100 S with 75 or 105 kN joining force
For thick sheet metal (up to 8 mm total thickness) and for multiple tooling configuration. Special strippers adapted to the application may be supplied. The PASS option is available for all modules. It uses standard tool kits: see corresponding setting force and sheet metal thickness on page 4. Add the force of all tool kits in order to select the corresponding work head.
Series SC P200 / P300 S with 200 or 300 kN joining force Clinching presses with customized tooling arrangement (multiple tool kits) and C' frame depth according to the application. The PASS option is available for all modules. It uses standard tool kits: see corresponding setting force and sheet metal thickness on page 4. Add the force of all tool kits in order to select the corresponding work head.
Examples of SPOT CUNCH® Joint applications
Building sector : Garage doors , Scaffolders, Doorframes
Heating, Ventilation, Air-Conditioning (HVAC) : Ventilation ducts , Solar collectors, Ventilation filters
Appliances: Stoves, Washing machines , Electric contacts Automotive sector : Heat shields , Window mechanisms , Bonnets/hoods - Boots/truncks
clinching clinchage clinchen
clinching clinchage clinchen
• Wilhelm Böllhoff GmbH & Co. KG, Archimedesstr. 1 - 4, 33649 Bielefeld, Deutschland (DE), Tel: +49521448201, Fax: +49521449364, email@example.com
• BDO SA, Epalinges
General Information - Bollhoff Attexor SA
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Contact people - Bollhoff Attexor SA Download the executives list
Monsieur Jacques Kowalczuk
CEO - Chief Executive Officer (Président Directeur Général)
Monsieur Baptiste Laurent
Monsieur Denis Ciocco
Monsieur Jean-Michel Mary
Chairman (président du conseil d'administration)
Monsieur Jacques Kowalczuk
Director (délégué de l'organe administratif)
Monsieur Carsten Löffler
Director (membre de l'organe administratif)
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