Railgrinder

A grinding wagons (including rail grinding cars) is an inserted in iron and trams rail vehicle, which eliminates surface defects on rail heads.

A distinction (also abrasive grinding Loren cars, trams ) between the grinding carriage with ( grinding railcars, grinding train ) and without their own accord. With trams they belong to the working car in railroads to side vehicles.

High tensile loads, high speeds in passenger and freight trains, and large axle loads lead to a strong stress on the superstructure. These stresses lead to high wear and tear that affects the longitudinal and transverse profile of the rails by driving surface error. These road surface defects are reasons for the fatigue of the steel, reducing the tension of the fasteners, stronger stress on the threshold bearing surfaces, destruction of the ballast structure, affecting ride comfort, favor the wear and tear on rolling stock and high noise levels. Therefore, it is necessary to grind the rail heads at regular intervals.

• 2.1 Neuschienenschleifen
• 2.2 Cyclic loops
• 2.3 reprofiling
• 2.4 Acoustic loops
• 2.5 high-speed grinding

Surface defects

Ausbröckelung

To determine damage to the rail surface, the rail surface measurement is necessary for detecting the following errors:

Riffles

Corrugations are regular, periodic unevenness in the track running surface, with lengths of 3 cm to 8 cm and a depth of up to 0.4 mm.

Short waves

Short waves are regular, periodic unevenness in the running surface of the rail length of 8 cm to 30 cm. The depths of the valleys may be up to 2 mm.

Long Waves

Long waves are irregular unevenness on the surface of rail vehicles having lengths of 30 cm to 250 cm. The depths of the valleys may be up to 1.5 mm.

Other error

The other problems include Übergratungen, wheel burns, breakouts, peeling, chipping and faulty weld joints.

Types of grinding

Neuschienenschleifen

Neuschienenschleifen takes place at new lines before start, otherwise as soon as possible thereafter, and is used to eliminate the weld joints, the skin rolling, the randentkohlten layer of surface damage caused by manufacturing and improvement of the cross section.

Cyclic loops

Neuschienenschleifen prevents the formation of fatigue on the driving surface and leaves unwanted surface defects do not arise.

Reprofiling

Restoring the original profile shape to preserve a desired running and wear quality. This also includes the manufacture of special profiles for the extension of the track ( track width loops) or the production of so-called " asymmetric profiles " in the arch to support the sheet travel of the vehicles and to reduce the high forces on the rail.

Acoustic loops

Grinding with particularly strict requirements concerning the roughness of the surface. This is realized either with oscillating grinding pots or with Rutschersteinen.

High-speed grinding

See high speed grinding.

Tram -grinding car

Many tram - abrasive car originated in the workshops of the transport companies through conversions of obsolete vehicles, but there are also companies that build special grinding car. A better-known manufacturers was in the 1920s and 1930s, the company Schörling, today is especially the Windhoff mentioned.

In normal train operation ( leaves) are the rails contaminated by external influences such as braking sand and grit, especially in autumn. This is the case of trams and a common operation relevant problem because the impurities on the one hand affect the braking and on the other hand the current flow through the return line used as rails. For this reason, some sanding blocks are used to eliminate these imperfections and impurities.

These are equipped with raisable and lowerable sliding blocks, which are pulled over the rails so as to grind off the irregularities.