Bench of presetting

The bench of presetting is a machine of measurement, control and adjustment of the cutting tools used in the Usinage of matters (metals, wood, composites.).

History

The term presetting is not any more topicality, this one was justified in the Seventies when the attachments (cones etc) used on the tool holders and the machines did not make it possible to guarantee the geometry of the tool nor the position of the tool on the machine. The first benches were equipped with mechanical feelers (comparators), then optical feelers (profile projectors). In the two quoted cases, the errors of repeatability and of reproductibilté were not compatible with the precise details desired by the users. After change of a tool holder, the operator launches the cycle of Usinage, checks the dimension part then corrects the machine from where the term of " préréglage".

Concepts

First good part

Concept of " first part bonne" imply that machining can be launched after each change of the tools without final improvement of the adjustments machines. To arrive to this objective, " the bench of préréglage" evolved/moved considerably since 1998 until our days, the optical palpation by profile projector was gradually replaced by a system of measurement comprising a camera, a software of analysis of images and a pin motorized for the automatic research of the point of reflection in X (not maximum of the tool to the ray)

Repeatability, reproducibility and precision

The precise details obtained of repeatability and reproducibility are about 2 micrometers. The general precision is dependant on the quality of the system of measurement used, and with the mechanical quality of the bench, the error of measurement in microns must not exceed E=3 + L/250µ The pin of the bench must be of great quality, maximum eccentricity should not exceed 2µ

Reception and qualification of the bench of presetting

For to qualify this material adjustment and of measurement, the car sought in years 95 a tool of qualification. A statistical tool called " CMR" or " Capability of the Means of Réglage" by Renault this one was developed is referred in standard CNOMO N°E41.36.421R According to the manufacturers of benches, tools of reception and validation of the material are integrated in the software of the bench.

Offered products by the market

There exist 3 big families of products and 2 types of benches:

vertical benches, used mainly for the revolving tools (Milling)
horizontal benches used mainly for the tools used in turning

bottom-of-the-range benches;
the benches midrange;
top-of-the-range benches.

Bottom-of-the-range benches

They do not have a pin of quality which will last in time (not of bearing of precision) The system of measurement can be with mechanical feeler or camera The camera comprises a software of measurement limited to some profiles of measurements of most current. No the upgrading capability. No the precision (+ 0,2 mm) No safety of repeatability and of reproducibility No the system of traction of the tool holder Few or not means of communication Little or not service of the retailer.

The benches midrange

Often equipped with camera Little or not upgrading capability Limited means of communication No safety of repeatability and of reproducibility No the system of traction of power tool of the tool holder. Limited software evolution More or less assured service.

Top-of-the-range benches

Always equipped with camera, they comprise systems of analysis of the image and programs of measurement which ensure a repeatability and a reproducibility without fault. Their means of communication are not limited and support the possibility of writing electronic labels, let us leave network towards waiter of workshop by integrating protocols or interfaces specific to the connected machines. The operations of hooping (hot or cold) can be integrated into the bench of thus automating presetting, the adjustment, measurement and safety in particular during the use of door hooped tools using technology of microdiffusion. Control and security of the calibration. Great choice of systems of traction of the tool holder in the pin. Many material and software options. Evolution of the software. Service ensured by the manufacturer.

Derivative products

In the family of the vertical benches, at the end of the years 1990, a control console of the cutting tools made its appearance. It is able to measure the angles of cut, clearance and the various characteristics of the tools of form (strawberries, drills special tools.) this type of bench is especially used by the setters and manufacturers of tools, as well as the clients anxious to control the quality and the conformity of the cutting tools which theirs are delivered.

External bond

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