SVIBOR - Project code: 2-08-209


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Project code: 2-08-209

Investigation of the special methods in the machining by cutting

Main researcher: PAVIĆ, ANTE (67642)

Type of research: applied
Duration from: 01/01/91. to 12/31/95.

Papers on project (total): 4
Institution name: ENIN-Energetski institut Holding d.d., Karlovac (155)
Address: Mala Švarča 155
City: 47000 - Karlovac, Croatia
Phone: 385 (0)47-335-644
Fax: 385 (0)47-336-760

Summary: The process of micromilling of the large flat surfaces has been investigated. The experiments with micromilling of contact surfaces of steam turbine housing has been carried out. The effects were significant, high quality of roughness Ra = 0,24 m has been achieved and the machining casts have been decreased for more than 2 times. The application of ceramic inserts at machining of cylinder bore of the large ship Diesel engine has been investigated as well as the application of CBN inserts at the machining of welded stellite layer on the motor valves. The results are very good in both cases. Tool wear (dimensional wear) at fine machining of steel by turning and its effects on quality of the machined surface have been investigated. A new approach to the tool wear criteria selection has been suggested, that is technological totol wear criteria based on the measures accuracy and the roughness of the machined surface has been accepted. This makes endables possible supervision of fine machining process at automatized machining systems.

Keywords: mikromilling, ceramic inserts, CBN inserts, fine turning, tool wear criteria, dimensional (radial) toolwear

Research goals: The aim of the research of micromilling was substitution of the complexed of operations grinding and hand scrape of the large surfaces by the operation operation of micromilling. The expected results have been achieved completely rooughness Ra = 0,24 micrometers and the machining costs have been decreased for over 2 times comparing to the previously used produciton procedure. The aim of investigation of turning of large diesel engine cylinder bore by ceramic inserts was to achieve minimaln tool wear and the measure inside tolerances of the all cylindar bore length. The results have shown that the ceramic insert can satisfy the requzired machining conditions. At turning of welded layer of stellite 1 on the seat of the skip diesel engine valve by the tooll CBN inserts, the aim was the supstitution of the grinding operation which is slow and expensive. The expected results define the optimal culting speed and increase the economy of the machining process. At the investigation of dimensional tool wear at fine turing the aim was to investigate and to define the basic quantities of the fine machining process and of the dimensional tool wear in order to accept the new technological tool wear criteria. The expected results are: dimensional tool wear is systematic phenomen and makes up to 50% of the total machinig error. In the conditions of the fine turning it is possible to use the technological tool wear criteria based on the workpiece.


  1. Name of institution: Adriadiesel, Karlovac, Hrvatska
    Type of institution: Economical/Production
    Type of cooperation: Other
    City: 47000 - Karlovac, Croatia

  2. Name of institution: ABB, Karlovac, Hrvatska
    Type of institution: Economical/Production
    Type of cooperation: Other
    City: 47000 - Karlovac, Croatia

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Last update: 10/18/95