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Abstract: The technology of broaching is one of the machining methods used in mass production. It is a very rare technology. Its application is very economical and it achieves high quality parameters of machined surfaces. In our paper we describe two selected aspects: 1. the economical aspect - the use of statistical methods in the field of metal chip machining in the technology of broaching of internal contoured surfaces, 2. the technology aspect - the achieved surface roughness of internal contoured surfaces - the groove - in the conditions of mass production.
Keywords: broaching, statistical methods, profile shape, roughness
1 INTRODUCTION
The technology of broaching [10] of internal contoured surfaces of workpieces stands for the production of internal profile which is being shaped on the components with through-hole [11]. In practice this through-hole d is typically machined by turning or drilling as a preceding manufacturing operation. The linear motion of the broaching tool through the machined workpiece leads to the required shape of the internal section. It is a negative contour of the toothing of the broaching tool on the shaped component [3]. In practice this shape is often in a form of a profile shape [2].
The authors in study [13] developed an automatic machine for measuring the irregular tooth contours of large ring parts in the broaching process, to ensure cutting tools are replaced when necessary. The authors in [14] measured the surface roughness at different vibration values at technology of broaching. In the paper [4], based on the productivity criterion, various machining technologies focused on the production of internal grooves were compared, and the technologies of broaching with HSS (broaching) tools and Carbide (broaching) tools were also compared.
It is suitable to use profile calibres and regulating gauges for the measurements of the section and it is suitable to use a roughness measuring device to determine the roughness of the surface after technology of broaching.
While indicating the effect of the process of broaching of the internal contoured surface on other parameters of the shaped component it is suitable to use the methods based on the statistical concept.
1.1 Statistical Methods
In the following part of this paper we will present a number of selected statistical methods which we will apply...