Disclosed is a hand held micro-adjustable bucking bar anvil having an adjustable threaded spindle for positioning the anvil face to the correct height above the surface of the sheet metal, for shaping new rivet heads to the proper diameter, height, and shape meeting the manufacturer's specifications for riveting sheets of metal together as the riveting process is completed. A further disclosure of this present invention is incorporating a threaded spindle having positioning feet. The positioning feet will maintain the rivet head tolerances as the self-leveling feet reaches the working surface; the feet will align the micro-adjustable bucking bar's horizontal and vertical axis to meet the height, diameter, and shape of the rivet heads. The feet align the bucking bar anvil equally on flat surfaces as well as curved surfaces, while shaping rivet heads. The hand held micro-adjustable bucking bar anvil incorporates a spring-loaded spindle lock for locking the threaded spindle in a desired position on the micro-adjustable bucking bar. This creates a micro-adjustable spindle for easy setting by an inexperienced or experienced bucking bar operator while maintaining the rivet head tolerances to the manufacturing specification.

Tungsten Bucking Bar Manufacturer & Supplier: Chinatungsten Online - http://www.buckingbar.cn
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A bucking bar is basically a metal anvil which is placed against the end of the shank of a rivet. Typically, a flat surface of the bucking bar interfaces a flat end of a rivet shank. The head of the rivet is then “hammered” by a driver, thereby causing the shank to spread against the bucking bar. To produce a properly shaped butt of proper thickness, prior art bucking bars have required a skilled operator. Failure of the operator to hold the bucking bar square against the rivet shank will result in misshaped butts and bad rivet resulting in costly rework. Furthermore, prior art bucking bars are prone to wandering during the spreading operation and occasionally wander off the shank, likewise resulting in a bad rivets and subsequent rework.

Bucking bars are available in a variety of shapes and sizes to accommodate various obstacles which potentially interfere with a spreading operation.

Tungsten Bucking Bar Manufacturer & Supplier: Chinatungsten Online - http://www.buckingbar.cn
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The tool used to form an upset head while using a pneumatic rivet gun is a bucking bar. Bucking bars are made in various shapes, sizes and weights. The weight of the bucking bar must be proportional to the size of the rivet.

To obtain a proper upset head, a good technique to use is shown in Figure 1.17.1. As the gun is firing,press the bucking bar firmly against the forming rivet shank and roll the bar slightly. This rolling action will aid in the formation of a barrel-shaped bucktail. If the bucking bar is too light for the size of rivet and gun, the metal will bend toward the bucktail. If the bucking bar is not held firmly against the rivet shank,the metal will bend away from the gun.

Tungsten Bucking Bar Manufacturer & Supplier: Chinatungsten Online - http://www.buckingbar.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
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Oxidation experiments were performed on pure tungsten and hot-pressed tungsten carbide. The chemical state and thickness of the oxide products were determined by ESCA. The oxidation of W and WC in dry atmosphere was performed in oxygen at temperatures ranging from 20 to 500 °C. The oxide formed is WO3. The thickness of the oxide layer increases slowly up to 200 °C, after which the oxide growth is rapid.

The oxidation behaviour of W and WC in humid atmospheres was studied at room temperature in air at relative humidities of 60 and 95%. It was found that the thickness of the oxide layer increases with increased humidity. No formation of hydroxide was observed. Exposing W to water for one week results in a thick layer of WO2, WO3 and hydroxide. In the case of WC no oxide at all was visible after exposure to water. Furthermore, WC is resistant to further oxidation after exposure.


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