Ch Pulka, V Senchishin, V Gavrilyuk, M Bazar
Induction surfacing is applied in manufacture and repair of cutting tools of agricultural machinery. Deposited layers improve the tool wear resistance. Here it is important to take into account the deposited layer thickness. The paper presents the results of investigation of geometrical characteristics of a layer of metal deposited by induction process with wear-resistant powder-like consumables by four technological sche-matics. It is shown that application of shields, horizontal vibration and
more » ... rotation of the surfaced part improves the stability of geometrical characteristics of the deposited metal layer by 22 %, compared to traditional induction surfacing. A procedure was developed for measurement of geometrical characteristics of the metal layer deposited by induction process, which allows increasing the measurement accuracy, as well as monitoring the stability of layer thickness at development of new technological processes of induction surfacing of thin flat parts. 8 Ref., 3 Figures. K e y w o r d s : induction surfacing, inductor, surfacing modes, thermal and electromagnetic shields, deposited layer thickness, rotation, horizontal vibration In agricultural machinery engineering induction surfacing is used to improve wear resistance of shares of ploughs, cultivators, plant top cutters, etc. [1, 2]. The task of surfacing thin steel disks-top cutters of beet harvesters of a toothed shape of relatively large dimensions and complex configuration, is particularly complicated (Figure 1). Diameter of top-cutter disc is 420 mm, deposited layer width is 30 mm, thickness of base and deposited metal is 3 and 1-0.2 +0.5 mm, respectively [3]. Width of surfaced zone is larger than the height of the tooth proper. Machining of the layers deposited by induction process on the tools of agricultural machinery is not performed, as a rule. For this reason it is important to select such surfacing modes, which would ensure the specified values of geometrical characteristics of the deposited layers in as-surfaced condition. This, primarily, concerns the deposited metal layer thickness, on which the wear resistance and self-wetting of the surfaced tools depend. In addition, at development of new technological processes with application of induction surfacing [3], very often it is necessary to monitor and compare the influence of a particular technological process of surfacing on geometrical characteristics of the deposited metal layer. The purpose of this work is investigation of the influence of technological schematics of induction surfacing by wear-resistant powder-like alloys on dimensions of deposited metal layer. As the currently available methods and tools for assessment of geometrical characteristics of the deposited layers are complex in terms of design Figure 1. Schematic of configuration of plant top cutter (a), and cutter section along A-A with the device for deposited layer measurement (b)