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TECHNICAL TALK 12: Facel-Métallon Bodywork

Introduction

The Facel name is best known now for the construction of the Facel-Véga car from 1954 until the mid-1960s, to the striking designs of Jean Daninos. But before this, Facel S.A. was a manufacturer of pressed steel car components. To intensify its World War II war effort, French subcontracting company for military aeronautics Bronzavia created a subsidiary called FACEL (Forges et Ateliers de Constructions d’Eure-et-Loire) in December 1939. After the war, in 1945, by merging with Métallon, Facel began to make short-run special bodies, coupés or cabriolets for Simca, Ford of France, Panhard and Delahaye.

Unitary bodies without a chassis became general for mass-produced cars, and Facel lost its big customers. French niche manufacturers ceased production. Métallon left the partnership in 1953, and Facel set about designing and making its own complete cars using engines made by Chrysler, Volvo and Austin. Its first design, named Véga, was shown to the public in 1954.

Our Technical Talk dates back to events in 1952 when Facel-Métallon were still making bodies for other companies. It shows some remarkable technologies and processes for short-run bodywork manufacture. Factories were at Amboise in the Loire valley, about 130 miles south-west of Paris, at Dreux, 50 miles west of Paris, and at Colombes and Courbevoie in the Paris suburbs.

 

Everything from bodies to bumpers

At the 1951 Paris Salon Facel-Métallon showed four stylish examples of their work:

  • The Dyna-Panhard four-door saloon
  • The Simca-Sport coupé
  • The Ford Comète two-door saloon
  • The 4½-litre Bentley coupé.

They made much of the fact that they were not just makers of all-metal bodies in series. They also made bumpers, nave plates (hub caps), wheel embellishers and radiator grilles in stainless steel for the wider auto industry. Other products were combustion chambers for the Rolls-Royce Nene and Tay engines, pressed-steel kitchen cabinets and stainless-steel sinks.

In 1952 the company was building over 100 bodies a day: 70 Dyna-Panhards, 12-15 Simcas and Ford Comètes, and 20-25 military vehicle bodies.

 

Presses

Facel-Métallon had an impressive array of heavy-duty presses at the Amboise plant: a Lake Erie 575-ton press for large roof pressings, a Clearing 500-ton triple-action press and a Speirtz double-action 180-ton press, alongside many presses for smaller components. On order were more: a Clearing 750-ton, and two from Spiertz: 450 and 320 tons.

 

An automatic polishing line

The Amboise factory made 400 to 500 pairs of bumpers a day. In-house engineers therefore designed a 30-yard-long polishing line with a chain conveyor and electrically-powered mops on pivoted beams that provided the necessary pressure on the bumpers. They were inclined at different angles to polish the whole bumper surface effectively.

The automatic polishing line for stainless steel bumpers

 

Dyna-Panhard bodies at Colombes

These four-door four-light saloons were of unorthodox construction in light alloy. The scuttle comprised two Alpax castings (aluminium with 0.75 per cent iron maximum, 12.5 per cent silicon and 0.2 per cent impurities maximum). Other Alpax castings formed the sills, standing pillars, cant rails (the rails above the side windows) and the front half of the rear wheel arches. These were all sand castings rather than die-castings, for a very good reason: when production started in 1945 die-casting technology was poorly understood. It was then found that for large castings the rate of production with die-castings was not much higher than with sand, hardly justifying the additional cost of dies – especially since the sand castings were clean, requiring little work other than trimming. They were then machined, drilled and tapped for attachment bolts and screws and assembled in jigs.

The ten Alpax castings forming the Dyna-Panhard body frame

 

Steel pressings were only used for the front part of the floor, made from three steel pressings spot-welded together. All other pressings were from Duralinox, an aluminium alloy with minor amounts of copper, iron, silicon and manganese and 5 per cent magnesium.

Two large pressings formed the body shell, and doors were made from two pressings, flanged to form the window apertures and door edges and spot-welded together, the edge of the outer pressing being turned over the edge of the inner pressing.

Two pressings carried the front assembly of the bonnet and front cowl.  The cowl was pierced for the simulated radiator grille, in fact a simple louvred pressing admitting air to the air-cooled cylinders. Duralinox wing pressings were bolted to the main structure to allow easy replacement in the event of damage.

Dyna-Panhard front cowling and grille

 

Assembly, on wheeled stands, took 30 man-hours per body. Transport to the Dyna-Panhard factory was on low-loading semi-trailers, carrying twelve bodies and their light tubular support frames. Each weighed only 300 lb, giving a total load of 33 cwt (1.65 tons).

Twelve Dyna-Panhard body shells transported on a semi-trailer

 

Coupé bodies for the Simca-Sport chassis – a different method

For these bodies the floor was made from steel pressings, ribbed for stiffness. A framework of pressed or folded steel members was built up on the chassis in jigs, and then welded. This was done for sills, scuttle dash, door hinge pillars, door hinge pillars and rear waist rail. The inner wheel arches extended back to support boot and tail panels. Projections from these were welded to the rear waist rail and therefore supported it. Spot welding was extensively used, with oxy-acetylene welding for some seam joints.

Spot-welding a rear floor and wheel boxes

 

The main assembly jig for the Simca-Sport body

 

The steel roof pressing was mounted on the welded-up framework and welded to it to tie the scuttle and rear portions of the body together.

At the front of the Simca, four main aluminium pressings were seam-welded together to form the front wings, bonnet surround, and front cowl. At the rear, another four Duralinox pressings were welded to make the whole unit.

Simca-Sport bonnet and wing assembly

 

Channel sections were pressed around the bonnet and boot lid apertures; they served both as drain gutters and stiffeners for the pressings.

The steel roof pressing then had to be fixed to the aluminium front assembly and Duralinox boot panelling. This was done by a “cold welding” process. Joint surfaces were heated by gas torch, and a special tin-bearing alloy, on melting, combined with both the steel and aluminium or light alloy.

The Simca-Sport body assembly line

 

The Ford Comète

The stainless steel facia on the Ford Comète

 

The Ford Comète main structure jig

 

This body was made entirely from steel, but the construction was similar to that used for the Simca-Sport coupés – with the important difference that the body frame was integrated to the chassis by welding. This required a modification to the standard Ford chassis: the upper half of the rear portion of the cruciform cross-bracing was cut away by oxy-acetylene torch and then reinforced to ensure no loss of strength or torsional rigidity. This lowered the floor level at the rear, and was fully approved by French Ford engineers.

The steel body structure, welded to the Comète chassis. The chassis has already been lowered and reinforced at the rear

 

The Bentley coupé

This was a one-off, built for the chariman and managing director, Jean Daninos. As with the Comète, the steel side, front and rear structures were built into a frame, panelling was applied and the whole structure was welded to the chassis at four points. Panel pressings were all in Duralinox, apart from the doors, which were built up from steel pressings.

The low-slung Bentley coupé, weighing 3 cwt less than a standard saloon

 

An interesting feature of the main facia pressing, which swelled out in front of the driver to carry the instrument panel, was its painted burr walnut finish that matched the real timber of the panel in front of the passenger and the door cappings. The production Facel-Véga, two years later, used the same technique.

Making a one-off body from pressings may seem to be a costly exercise, with no opportunity to amortise tooling costs over multiple examples. The explanation was simple: prototypes and one-off cars used Kirksite dies and drop hammers to produce the panels. These zinc-based dies were made by the plant engineers.

 

Painting and trimming

These final processes were carried out at the Dreux factory, where infra-red drying ovens were installed. Cushions and squabs made extensive use of Dunlopillo, and corduroy was an unusual upholstery fabric mainly reserved for the Simca-Sport coupé. Comète saloons featured plain cloth – and the Bentley was naturally finished in Connolly leather.

 

A conclusion

A report on the processes used by Facel-Métallon made two particular concluding observations. Firstly, that the factory had evolved many novel processes; and secondly, that the system lent itself equally well to production in series or to the fabrication of prototype and one-off bodies.

Images courtesy of the Richard Roberts Archive


One response to “TECHNICAL TALK 12: Facel-Métallon Bodywork”

  1. Hans says:

    A very good read

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