Grinding behaviour of bricks – results from laboratory and practice (Part 1)

This article provides an overview of the grinding of bricks and the influencing factors. The appropriate grinding tool depends on the characteristics of the brick. In practice, it is chosen by experienced testers and the choice is often an emotional one. So the idea was to carry out a preliminary systematic test in the laboratory regarding the machinability of fired raw material and to analyse the influence of the raw material and the firing temperature on the grinding of bricks. For this purpose, a test method was developed at the company Lingl. With the application of this method, the machinability of laboratory samples always produced under the same conditions is quantitatively determined and thus evaluated independently of the tester. First results of this method are listed in Part 2 of this article and compared to results from the field.

1 Introduction

Laying bricks without mortar and joints places high demands on the characteristics of the contact surfaces. Bricks are therefore plane ground to compensate for any existing uneven areas on the surface. For more than a decade, Lingl has been developing grinding machines and methods for machining bricks with different product properties. The task of the machine engineer is to ensure maximum throughput for the specified base and grinding size as well as plane parallelism of the contact surfaces. The demands on the grinding surface pattern, however, are prescribed by the customer....

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