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

»1 Production costs at different material removal rates according to [2]

»2 Tool structure with bond, pores and abrasive grain [2]

»3 Enlarged view of the surface of a grinding segment with diamonds, bond ridges and chip spaces (Source: Saint Gobain)

»4 Different segment shapes of cup grinding wheels

»5 Low-density brick with a high percentage of perforations and thin webs, left image before grinding, right image after grinding

»6 Individual values for drilling depth and material removal after the drilling test on fired specimens

»7 Diagram of evaluation to assess the drilling behaviour of a fired body

»8 Material removal from drilling test against open porosity

»9 Material removal from drilling test and bending strength

»10 Material removal from drilling test and bulk density of body

»11 Drilling depth from drilling test und firing temperature

»12 Drilling depth from laboratory test and material removal rate from grinding test in practice

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....

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

1 Introduction

Related articles:

Grinding behaviour of bricks – results from laboratory and practice (Part 2)

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1 Introduction

ZI 05/2014

ZI 05/2014

Related articles:

Grinding behaviour of bricks – results from laboratory and practice (Part 2)

Grinding behaviour of clay bricks – results from the laboratory and field

Brick grinding precise to a tenth of a millimetre

Saving energy in clay brick production by use of vibrating cutting wires

Wassmer Group presents three-stage surface grinding system