Abstract
A method has been proposed for machining the outer and inner conical surfaces of the wrist pin and insert, which represent a sliding friction pair on the mortar mixer frame. The machining implies the application on the conical surface of parts, preliminary prepared through turning, of a wear-resistant material in the form of a hard alloyed nickel-based powder. It is applied with a special burner with a hopper-dispenser filled with powder. The result of mixing a combustible gas (acetylene and oxygen) in the burner with the powder from the hopper is melting. In the course of implementing a given technological process, by using mathematical modeling methods, we have determined the optimal mode parameters (PG10N-01 powder consumption is 33.5 g/min.; oxygen flow rate is 7.0 l/min; acetylene pressure is 0.043 MPa) for the gas-flame surfacing, which ensured maximum effect, that is, the greatest strength of adhesion (45 MPa) for the surfaced coating. The surfaced coating quality was checked by using a pin method for determining the adhesion strength between the new coating and the base on a tensile testing machine. A series of experimental studies into the enhancement of abrasive resistance of a sliding frame, namely a comparison of the surfaced coating with other well-known wear-resistant materials such as steel ShKh15, KhVG, were carried out at a specially designed experimental bench. Its structure is based on a vertically drilling desktop machine adjusted to the conditions of a working process that occurs inside the body of a mortar mixer. These include an abrasive medium, and the radial and axial efforts. To determine the axial load on a frame, we have proposed a structure of the hydraulic device, which includes a pressure gauge, a piston, a sleeve, and a ball. The axial load has been found for the most unfavorable conditions of mixer operation. Its value was implemented at an experimental wear bench. In addition, we have performed a series of experimental studies to determine an optimum angle of the cone at the apex of the wrist pin and insert in a conical slide frame for the minimal wear. Using the proposed technique of a gas-flame surfacing could significantly improve the abrasive and corrosion resistance of a slide frame, thereby prolonging the lifespan of a mortar mixer in general, as well as the overhaul cycle for equipment designed to prepare soluble mixtures used for construction
Highlights
The operation of technological machines is accompanied by phenomena and processes that could result in their failure
Based on the detailed analysis [2, 3], in order to improve the abrasive resistance of the conical slide frame in the working body of a mortar mixer, operated in a soluble mixture used for construction, a method of gas-flame surfacing was recommended
The aim of this study is to reduce the magnitude of abrasive wear of the wrist pin and insert in a conical slide frame, which works as part of the screw working body of a mortar mixer and interacts with a soluble mixture used for construction
Summary
The operation of technological machines is accompanied by phenomena and processes that could result in their failure. Based on the detailed analysis [2, 3], in order to improve the abrasive resistance of the conical slide frame in the working body of a mortar mixer, operated in a soluble mixture used for construction, a method of gas-flame surfacing was recommended. That makes it possible to flexibility and independently control a working temperature, control the consumption of a surfaced material; it does not require any complex technological equipment, nor significant energy costs. The frame ope rates as a part of the working body (belt auger) of a mortar mixer for preparing soluble mixtures used for construction
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