Martin Kotus

Resistance of Hard-Facing Deposit Created by Laser Surfacing Technology

Presented study deals with the resistance of a surface layer created by laser surfacing. Hard surfacing metal powder of type UltrAloy 10611 with a 50 % share of tungsten-carbide particles was used for laser surfacing. Created weld was tested in laboratory conditions (hardness HRC) as well as in field soil conditions (relative wear resistance). Obtained results confirm that this added material is suitable for use in conditions where high abrasive wear is present

Quality and Reliability of Manufacturing Process in Automation of Die-Casting

This study deals with the assessment of manufacturing process quality when die-casting aluminium alloys. We evaluated the manufacturing process on the basis of a time period needed to manufacture one cast and the number of casts produced within the selected period. The manufacturing process of aluminium casts was compared at three different automation levels of diecasting. Based on values of process productivity and the number of nonconforming casts, we determined the quality and reliability of the manufacturing process.

Cutting inserts effect on heat generation in turning process

The paper is focused on confirmation of an effect of cutting materials and cutting inserts geometry on cutting forces and temperature, quality and accuracy of machined surface in turning. The main part is devoted to description of advanced turning tools and cutting materials. The experimental part is focused on cutting forces and temperature measurement and machined surface quality in turning of steel grade 11 523 samples with one feed and depth of cut value and varying spindle speed. Measurements were performed with various types of indexable cutting inserts used. Measured values were evaluated in terms of the effect of different properties of cutting inserts and various spindle speed values.

RESISTANCE OF COATED ELECTRODES SUITABLE FOR RENOVATION OF TILLAGE TOOLS

This article deals with the abrasive wear resistance of additional materials. The resistance of individual materials was figured out by determining a proportional wear resistance on a grinding fabric. Results of the experiment confirmed an increase in welds abrasive wear resistance. Chosen coated electrodes are suitable for the renovation of tillage tools of agricultural machines.

MODELLING OF NON-ROAD TRANSIENT CYCLE

The paper describes the modeling of NRTC (Non-Road Transient Cycle) test procedure based on previously measured characteristics of fuel consumption, carbon monoxide (CO), carbon dioxide (CO2), hydrocarbons (HC), nitrogen oxides (NOx) and particulates (PM) production. It makes possible to compare the current technical condition of an internal combustion engine of an agricultural tractor with its previous state or other tractor’s engine. Based on measured characteristics, it is also possible to model any other cycle without further measurements (NRSC test procedure, cycle for specific conditions – mountain tractor, etc.). The result may thus contribute to improving the environment by reducing the production of harmful substances emitted into the air and save money due to reduced fuel consumption.

The Possibility of Increasing the Wearing Resistance of Mulcher Tools

Abstract This paper presents a utilization of mulcher tools, their wear and possibilities of increasing their lifetime and durability based on analysis and tests. Mulcher tools are subjected to a very strong wear causing the loss of soldered WC tips in some cases and even permanent deformation of the body tool made of steel 14 220 (16MnCr5) during the continuous use. Images depicting the loss of material from the mulcher tool due to wear were produced by overlaying the pre- and after-wear tools by means of the optical scanning system. Input analyses - measuring of hardness, impact test and evaluating of microstructure showed that forging is without heat treatment. This does not provide sufficient mechanical properties to tools that would ensure work continuation after losing WC tips. Therefore, an appropriate process of heat treatment of the tool body has been proposed. By comparing the loss of material using abrasive test, it was observed that the wear of heat-treated material was three times lower than of material without heat treatment. This gives the precondition for increasing the resistance of the tool body and thus increasing of lifetime and durability after loss of WC tips. The implementation of such a solution could bring not only technical but also economic benefits.

Using 3 × 3 Matrix to Evaluate the Manufacturing Technology in Food Company

Abstract In order to produce goods of sufficient quality finding buyers in the market, a company must have an adequate knowledge of their production technology. Technologies and finished products at the same time will affect the position of the company in the market and hence its existence in this market. Therefore, it is so important for every company to determine the appropriate technological strategy. The 3 × 3 matrix is a very useful tool to do so. This matrix shows the relation between technological possibilities of the company and its position in the market. However, that requires changing the scale used in the matrix. In practice, this means that both those that have a positive impact on the company and those that have a negative impact on it can be included in the factors. The research was conducted in a food industry company. It turned out that the research company was located in field of the matrix marked as ‚Improve marketing’. It means that the company should put more emphasis on improving the factors related to its position in the market.

Abrasive resistance of filler metals in laboratory conditions.

Wear of selected surfacing welded materials at the tribological test in laboratory conditions is deal with in this contribution. Filler metal is evaluated according to its weight loss, relative wear resistance and hardness. Tested materials show higher abrasive resistance and they are suitable into the conditions with intensive wear.

Impact of Technological Factors on Dosing of Metal at Die-Casting

This contribution describes the dosing method at die-casting using a mechanical dosimeter, by derivation of back coupling from the motion of the dosimeter arm. The motion of the dosimeter arm is described by motion equations and their analysis by the linear theory of control. Furthermore, there are derived the transfers of actuating quantity, failures and controls. Based on them, the control circuit is stable and periodic after satisfying certain conditions, failing which it is stable, damped and oscillating.

Measurement of Adhesive Wear Share in Laboratory Conditions

The study is focused on the one of possibilities of adhesive wear measurement in laboratory conditions. Adhesive wear share is defined on the basis of tribological quantity such as frictional force, radial wear and frictional temperature. Obtained results suggest the correct selected measuring succession for adhesive wear monitoring.