Moulded-In Compression Limiters

SPIROL manufactures several different styles of Post Mould Installed Compression Limiters for installation into the plastic component after the molding process is complete. Installing Compression Limiters after the plastic has cooled typically results in the lowest total installed cost since there is no added cycle time associated with placing the Compression Limiters over core pins during the moulding process. Post mould installed Compression Limiters also eliminate any concern with damaging the mould due to improperly positioned components. SPIROL Standard Post Mould Compression Limiters include: The Series CL220 Split Seam, Series CL200 Split Seam - Slim Profile, Series CL350 Split Seam - Heavy Wall, Series CL400 Split Seam - Oval, Series CL6000, CL6100 & CL620 Aluminium and Series CL8000 & CL8100 Brass.

SPIROL offers robust, vertical installation machines specifically designed to post-mould install Compression Limiters into a variety of plastic assemblies. The machines can install a single Compression Limiter or multiple Compression Limiters simultaneously into various polymers, thermoplastics and thermosets. SPIROL’s Compression Limiter Installation Machines are versatile solutions designed to be retooled to accommodate changing part configurations. All designs incorporate standardized machine components to reduce factory lead time, improve component reliability, and lower component costs. SPIROL also specializes in application-specific fixtures to ensure that all assembly components are held accurately in place through the installation process.

A fuel injection systems manufacturer used two steel brackets to clamp the fuel rail to the top of the engine. The customer was looking at changing these brackets to plastic to reduce costs. In order to prevent deformation of the plastic bracket during the tightening of the bolt, a Compression Limiter was required. The customer originally investigated the use of a machined Compression Limiter, but the savings from changing the metal bracket to plastic would have been lost considering the high price of the machined Limiter. The customer approached SPIROL to help provide a lower cost solution for the Compression Limiter. SPIROL recommended the use of a standard CL200 Compression Limiter based on the rated proof load of the bolt used in the assembly. This roll-formed Compression Limiter is a fraction of the cost of a machined Compression Limiter. In addition, the flexibility of the roll formed Limiter enabled the customer to widen their hole tolerances further reducing assembly costs.

This exceptionally versatile tool for post-mould assemblies is ideally suited to all levels of production: from a single unit for prototype assembly, to multiple units on an assembly line. The SPIROL® Model CM Manual Compression Limiter Installation Machine easily accommodates quick change-overs by simply: • Replacing the fixture • Swapping insertion punch/pusher tip • Adjusting the positive stop for new install height. The use of high quality shafting and bearings results in smooth operation, precise positioning, repeatability, and durability. The Model CM Manual Compression Limiter Installation Machine installs Compression Limiters ranging in diameter from M3 to M10 metric and #4 to 3/8" unified, and has a maximum insertion force of 0.9kN (200 lbs).