Studies on the Determination of Hardening Parameters Working Area of Gin Grates

Previous studies have established that one of the main reasons for the decrease in the natural properties of the fiber is the unfavorable state of the technological surfaces of the working bodies of machines interacting with processed cotton [1-3]. It leads to the destruction and reduction of the length of the fibers, to mechanical damage and a decrease in their strength, to an increase in the content of defects and fluff in the fibrous mass. This, in turn, leads to a decrease in the spinning properties of the fiber, which is expressed in an increase in breakage in the spinning industry, a decrease in the strength of the yarn and the quality of the fabric produced, which causes significant losses in the textile industry.

It is known that the main reason for the wear of the grate is the grazing of the saw on the grate, which occurs due to the inaccuracy of the assembly of the grate and the saw cylinder. To study the wear of the grate, a stand was made that simulates the grazing of the saw on the grate in real conditions [4,5].

In order to determine the quality of hardening of the working surface of the grate, studies were carried out to determine the hardness and wear resistance. Hardness was measured in two areas - hardened and not hardened, for a comparative assessment

As the test results showed, by hardening the surface of the working area, a surface hardness of up to HRC 55 is achieved, which allows increasing the life of the grates by more than two times. Comparative wear of steel after quenching and cast-iron grates was studied on a special bench installation [6,7]. The research results are shown in the table 1.

Table 1:The results of studies of the comparative wear of hardened steel and serial cast-iron grates.

As can be seen from the data in the table 1, hardened steel grates had less wear over the same period of time due to hardening of the side surface.

The choice of the main parameters of surface hardening of the working area of gin and linter grates has been carried out. Comparative tests of grates with a hardened working area using the selected hardening parameters showed that their service life is increased by more than 2 times.

1. Ismailov AA, Maxkamov RG, Ibragimov AS, Agzamov M (2005) Research on the wear of various types of gin grates. TITLI, Textile problems, p. 3.
2. Agzamov MM, Yunusov SZ, Gafurov JK (2017) On the technological development of cotton primary processing, using a new drying-purifying unit. IOP Conf Ser Mater Sci Eng 254: 082017.
3. Butovskiy PM, Agzamov MM (2020) Production of fancy yarn on spinning machines. Trans Eng Comput Sci 1(1):105.
4. Agzamov M, Shamsiev Sh (2009) Study of the microstructure and hardness of a gin grate with a hardened working area. TashSTU, Vestnik, 1: 120-123.
5. Yunusov SZ, Agzamov M, Agzamov MM, Kamolov N, Pardayev Kh (2020) Influence of ginning for paddle roll speed raw roller saw gin. TEST Engineering and Management, USA, 83(4): 3908-3917.
6. Agzamov M, Raxmatov MB, Agzamov MM (2019) Sampling quenching parameters of ginning and linter ribs. Textile Journal of Uzbekistan 8(1): 65-71.
7. Agzamov M, Bakhtiyarovich RM., Agzamov MM (2019) The results of research to determine the parameters of hardening working area of the gin and linter grates. Journal of Mechanical Engineering Research 2(2).