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ISO 9001 2008

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How to Handle Caprolone.

     Structural plastics are easily processed on ordinary metal processing machine-tools and on wood processing machine-tools, in certain cases. However, there is a number of special features which should be taken into account to obtain desired results.

Due to poor thermal conductivity and relatively low melting temperature of thermoplastic, it is necessary to utmost carry out heat removal during mechanical processing in order to avoid temperature increase in the fabricated component. This rule allows avoiding thermal overload of plastic (change of color or even surface submelting). To do so, one should comply with following rules:

The edges of a cutting tool must be always in impeccable state and well sharpened.

A cutting tool must be installed so that the cutting edge just touches plastic.

One should take care to ensure good removal of cutting chips off the cutting tool.

Cooling must be ensured in case of great heat release (for example, during drilling operations).

Tools

Usually, tools made of carbonaceous or quick-cutting steel or hard alloys are used. Cutting teeth made of tungsten hard alloy or diamond cutting teeth are preferred during processing of thermoplastics.

Cutting Force

Since the force generated during mechanical processing of structural plastics is significantly smaller than during processing of metals, it is necessary reduce clamping forces. Because these materials are not as rigid as metals, components should be properly backed up in due course of processing to avoid deflections. For example, it is necessary to apply side holding fixture during processing of external diameter of a thin-walled bushing.

Saw Cutting

Belt, circ or saber saws with relatively large tooth-spacing may be used to minimize friction between a saw and working surface and to avoid blade suppression or even fracture. Application of circ disc frequently causes cracks and, therefore, is not recommended.

Drilling Operations

Spiral drills made of quick-cutting steel are very suitable; however, it is necessary to apply a cooling fluid because of intensive heat release. To ensure heat removal, a drill should be periodically pulled out of the drilling spot, especially, in case of deep drilling. In respect to large diameter holes, it is necessary to reduce usual thickness of drill crosspiece to reduce friction temperature. It is also recommended for large diameter holes to perform operations in sequences, for example, to drill50 mmholes: one should drill12 mmand25 mmin turns. Thereafter, the diameter may be expanded using drills of greater diameters or using a flat lathe tool. In order to avoid cracks, spiral drills should not be applied for rods of greater diameter (more than100 mm) when drilling holes; holes must be bored using a flat lathe tool the cutting edge of which is pointed precisely in the center. When drilling open-end holes, traverse must be reduced in the end of processing to prevent beat of the initial side by a drill or tooth that may cause edge cracking. Power traverses should be used if possible in order to avoid suppression and destruction of plastic during uneven manual traverse.

 

Cooling

When it is necessary to cool down components during processing, ordinary liquid cooling means or drilling emulsion may be applied. It is not applicable for amorphous plastic which are likely to generate cracks due to internal tensions, most suitable cooling means for these materials are water or compressed air.

Polyamide semi-finished products are permitted for mechanical processing during winter time only after exposure at room temperature for several days. Noncompliance with this recommendation may cause cracking of work pieces.

 

Recommendations for Usage of Conveyor Rollers. 

Depending on structural features preconditioned with volume and nature of cargo, conveyor equipment comes into various kinds: stationary belt conveyors, roller belt conveyors, mobile belt conveyors, telescopic belt conveyors. As a rule, conveyor equipment includes drive, tightening, safety and cleaning devices.

Rollers are designed to support belt branches in the belt conveyor. Rollers and roller supports are installed on elements of the conveyor support enabling regulation their position in horizontal plane relative to normal to longitudinal axis of the support.

Our rollers are used for conveyors which operate under tough conditions of ore and coal mines with methane and coal dust risk, for pits and ore-dressing plants, fuel supply of heat power stations and by-product coke plants, and facilities of metallurgical enterprises. The largest consumers of rollers produced by our enterprise are mining metallurgical combinates of theRepublicofUzbekistan.

 

Recommendations for Usage of Brushes.

Attention! Taking into account the composition of graphite brushes, do not use them instead of brushes of other grades, even if they fully match in sizes. Consequences of incorrect selection of an electric brush results in failure of a collector of electric engine which can not be repaired, thus necessitating purchase of a new electric engine. Reference designation or marking is an important feature of any brushes. When selecting electric brushes, pay attention to marking, reference designation, hardness and electric resistance.