Control of Deformation of Elastic Polymer-Abrasive Circles at their Wear

The article is devoted to the study of the wear intensity of elastic polymer-abrasive circles when processing the surfaces of parts made of high-strength aluminum alloys. Empirical dependencies of wear on cutting speed and tool deformation are obtained, on the basis of which method of tool deformation correction with long-term, continuous surface treatment is proposed. In practice, such a procedure is necessary due to the loss of process performance that occurs due to the reduction of tool deformation due to wear. The proposed technique allows to effectively control the finishing process as the tool is worn out.

Effect of Polyurethane Non-Transparent Coating Process on Paint Film Performance Applied on Modified Poplar

Whether modified poplar can obtain a qualified or even excellent finishing effect on European and American furniture is worthy of deep study. To evaluate whether the conventional non-transparent coating process is suitable for modified poplar, a multi-level hybrid orthogonal experiment method was carried out to start research on how factors affect the paint film performance of the non-transparent coating process. The effect of experimental factors and levels on paint film performance is pointed out, and the optimal factors and levels are found. Parameter optimization of the polyurethane non-transparent finishing process based on modified poplar is carried out. An application basis was provided for the extensive use of modified poplar wood as a substrate in the European and American furniture markets. The conclusions are: (1) gloss of paint film can be improved by increasing the number of nitrocellulose (NC) lacquer transparent topcoats, (2) adhesion and thickness of paint film can be improved by polyurethane (PU) sealing primer, (3) the initial paint film’s abrasion is influenced efficiently by the coating process and coating sanding. PU sealing primer has an efficient influence on the later abrasion of paint film. The effect of modified poplar surface pretreatment on the mass loss of paint film tends to be stable.

DEVELOPMENT OF A MATHEMATICAL MODEL OF THE FABRIC FINISHING PROCESS

In the article considered the process of dosage of chemicals for bleaching of tissues as a linear dynamic object. Presented a mathematical model based on approximation methods.

PERBAIKAN FINISHING PRODUK OLAHAN KAYU JATI BAGI PENGRAJIN LOKAL DI KOTA KUPANG

ABSTRAKPermasalahan utama yang dihadapi kelompok pengrajin Airnona dan Sikumana adalah kurangnya pengetahuan dan keterampilan dalam mengerjakan finishing pada produk olahan kaju jati yang mereka geluti. Mencermati permasalahan tersebut, maka perlu dilakukan edukasi dan pelatihan tentang berbagai metode finishing pada produk hasil kerajinan. Kegiatan pengabdian kepada masyarakat ini bertujuan untuk memberikan pengetahuan dan mengasah keterampilan para pengrajin tentang proses finishing produk olahan kayu jati. Dalam kegiatan pengabdian ini menggunakan metode ceramah dan diskusi dilanjutkan dengan praktek finishing produk yang difokuskan pada jenis aplikasi milamin. Setelah Kegiatan pengabdian ini selesai dilakukan, diharapkan peserta pelatihan mengetahui salah satu metode finishing yang baik dan mampu mengaplikasikanya. Ada empat tahapan yang dilakukan dalam kegiatan pengabdian ini, yaitu: kegiatan persiapan yang meliputi diskusi kebutuhan pengrajin, kegiatan manufacturing yaitu mempersiapkan modul produk yang akan difinishing, kegiatan pelatihan finishing produk yang berhubungan dengan aplikasi milamin, dan kegiatan pelatihan manajemen yang meberi wawasan kepada pengrajin tentang tata cara pencatatan dan pengelolaan keuangan. Dari hasil evaluasi terhadap kegiatan pengabdian yang telah dilakukan terlihat bahwa pengetahuan peserta pelatihan terhadap proses finishing produk olahan kayu jati semakin meningkat dan telah mampu mengaplikasikan jenis finishing milamin pada produk olahan dengan baik dan benar. Dari hasil pencatatan keuangan terlihat ada kenaikan penghasilan pengrajin setelah pelaksanaan kegiatan pengabdian ini. Pengrajin berharap ada kesinambungan kegiatan seperti ini dimasa yang akan datang. Kata Kunci : kayu jati; finishing; pelatihan. ABSTRACTThe main problem faced by the Airnona and Sikumana craftsman groups is the lack of knowledge and skills in finishing the processed teak products they are involved. Observing these problems, it is necessary to conduct education and training on various finishing methods on handicraft products. This community service activity aims to provide knowledge and hone the skills of artisans about the process of finishing teak wood products. This service activity uses the lecture and discussion method followed by product finishing practices focused on melamine application. After this service activity is completed, it is hoped that the trainees will know one suitable finishing method and apply it. There are four stages carried out in this service activity, namely: preparation activities which include discussing the needs of artisans; manufacturing activities, namely preparing product modules to be finished, product finishing training activities related to melamine applications, and management training activities that provide insight to artisans about procedures for recording and managing finances. From the results of the evaluation of the service activities that have been carried out, it can be seen that the trainees' knowledge of the finishing process of processed teak wood products is increasing, and they have been able to apply the type of melamine finishing to processed products correctly and adequately. From the results of financial records, it can be seen that there is an increase in the income of artisans after implementing this service activity. The craftsmen hope that there will be continuity of activities like this in the future. Keywords: teak wood; finishing; training.

Investigation of vibratory bed effect on abrasive drag finishing: a DEM study

Purpose The purpose of this paper is to investigate the effect of a vibratory bed, as an assistant agent, on the improvement of the drag finishing process. The dynamics and kinematic of the process were surveyed in microscale for different frequencies and amplitudes and the results were compared to the basic process. Design/methodology/approach The discrete element tool was used to find out the effect of the vibratory bed on the drag finishing process. To this end, the Hertz-Mindlin model was used to investigate the contact of abrasive particles and workpiece. At the first stage, the numerical model was validated with the experimental results, and then the effect of different parameters on the finishing process was evaluated and compared with the basic case. Findings The chosen numerical model was in good agreement with the results measured in the previous literature. Moreover, the results show that not only vibrated bed enhances the contacts of abrasive particles to the workpiece, but it also increases the uniformity of the finished surface. Originality/value In comparison to the experiments, the discrete element technique consumes lower cost and time to estimate the optimum conditions of the finishing process, as well as it provides a good understanding of this phenomenon on the micro-scale.