APPLICATION TECHNOLOGY New Rivit presses for self-clinching fasteners
Rivit Srl, based in Bologna, Italy, has always trusted the industrial use of self-clinching, a speed fastening system in thin sheets, as a lower cost alternative to other fastening systems requiring welding.
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or this reason Rivit decided to launch some new sheet metal working solutions to optimise the self-clinching studs application with presses - the pneumatic ones up to 7 tonnes of power and deep throat, or the more
classic and economic manual one. The pneumatic RIV2450, for nuts and studs from M4 to M8,
has 7 tonnes of power and 450mm throat depth. Rivit says it was created to be safe, flexible, compact, economical and easy to operate and maintain. The structure of the press and its interchangeable frames allow the installation of self-clinching fasteners in box-shaped pieces, frames and metal manufactures of big dimensions, already bent and also geometrically very complex. The eccentric dies allow the installation of self- clinching fasteners very close to the edges and to the bends. RIV2200 has 6 tonnes of power and 200mm throat depth,
and is the smallest one in size, but very big in its performance. The compactness and geometry of the structure allows users to install self-clinching fasteners with a force that goes up to
6,000kg for a vast numbers/types of shapes. RIV2200 is also a very safe tool because the use of moving saddles reduces the distance between the anvil and punch within the values of safety. Finally, RIV2100 is a manual tool featuring a simplified
construction, a high power ratio and maximum working safety. Rivit highlights that the main characteristic of this press is the extremely quick replacement and adjustment of punches and dies. For the operation it does not require any power source, except the manual one; it has a side lever on which a movement of only 90° can cause high pressure on the self-clinching fastener the user wants to install.
RIV2100 technical features Height: 400mm Width: 200mm Depth: 300mm Weight: 20Kg Power with applied force of 30 Kg: 1,600kg
RIV2450 technical features Power: 6 - 8 bar Force range: 7 tonnes Max sheet thickness: 3mm Weight: 300Kg
RIV2200 technical features Compressed air drive: 6 – 10 bar Power: 220V – 100W Force range: 280kg – 6,000Kg Max sheet thickness: 3mm Weight without/with base: 50/93Kg
www.rivit.it Seam design makes coiled pin perfect for hinges
Coiled spring pins are manufactured with a seam, which is much better for hinges than the gap or slot of slotted spring pins, says Michael Pasko, engineer at Spirol International.
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he seam is inherent to coiled pins because they are rolled with more than one wrap of material. The coiled pin’s ‘duty’ will affect material thickness and the coil configuration but all coiled pins will possess a seam. Some assume that a coiled pin’s seam is raised above the
surface of the pin. This is not the case. A coiled pin’s seam is actually ‘tucked’ or rolled to ensure the pin remains round. In addition, the seam is prepared with a bevelled edge to soften the transition into the ‘comma’ area. In fact, a key characteristic of a properly rolled coiled pin is that the diameter of the pin at the seam is equal to or less than the diameter adjacent to the seam. This prevents the edge of the material from contacting the inside diameter of the hole wall and prevent skiving when inserted. A large percentage of coiled pins are used in hinges and the
unique seam configuration is essential to their proper function. Thus, when utilised in round holes, the seam should have absolutely no impact on performance.
130 Fastener + Fixing Magazine • Issue 76 July 2012 The coiled pin’s tucked seam will allow smooth, interference-
free rotation of hinge/axle components in the vast majority of assemblies. In most situations where the seam is problematic, it is typically the result of poor installation methods or improper implementation. If excessive compressive force is applied to one part of the pin and not another, seam deformation may occur. This sometimes happens when assemblies are designed such that they do not properly support the pin. Similarly, pins can be damaged during installation and this can lead to deformation at the seam. Improper installation technique, equipment, hole condition, or pin material and duty are typical causes. Designers have also attempted to use coiled pins and slotted pins in assemblies where a ‘pawl’ or lever must ride axially on the surface of the pin as it rotates. The geometry of these components sometimes causes them to catch or ‘hang up’ on the seam.
www.spirol.com
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