Experimental study on resin-anchored bolt concentricity including a device for more consistent bolt centering

He, Deyin; Liu, Shaowei; Fu, Mengxiong; Peng, Bo; Ren, Yaofei

doi:10.1016/j.ijrmms.2021.104962

Cited by 12 publications

(4 citation statements)

References 25 publications

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“…Konsentrisitas yang termasuk dalam aspek toleransi, merupakan satu dari tiga aspek yang harus dipenuhi di samping dimensi produk dan pengalaman merakit produk [4]. Terpenuhinya konsentrisitas suatu mesin, akan berdampak positif pada kualitas yang dihasilkan yang melekat pada produk-produk hasil proses menggunakan mesin tersebut [5]. Akurasi dimensi dapat dicapai dengan jika konsentrisitas mesin yang lebih kecil dari 1 um [6].…”

Section: Politeknik Astraunclassified

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Pembuatan Automatic Tools Changer Flush Untuk Menurunkan Cacat Produk Pada Mesin CNC Milling

T. Wibowo,

Amanullah,

AT Manurung

2023

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Kualitas, biaya dan pengiriman merupakan obyektif perusahaan yang sudah jamak. Kualitas menghubungkan perusahaan dengan pelaku bisnis untuk mendukung berjalannya aktivitas di dunia manufaktur. Salah satu cacat produk adalah cacat oversize. Cacat ini merupakan ketidaksesuaian produk yang terjadi akibat ukuran yang tidak sesuai dengan standar. Akurasi ukuran dipengaruhi oleh berbagai hal, baik yang berkaitan langsung dengan proses permesinan maupun hal-hal yang tidak langsung. Dalam sebuah studi, didapatkan data bahwa hasil permesinan Cover R K45G mengalami cacat oversize dengan rerata sebesar 3.56% dari total produksi. Angka tersebut dua kali lipat dari ambang batas cacat oversize yang diijinkan. Dengan menggunakan pendekatan akar masalah yaitu 5 why analysis, dilakukanlah studi lanjut untuk penanganan masalah yang ada. Studi lapangan menunjukkan adanya scrap yang menempel pada tools magazine, yang menyebabkan ketidakcentrisan alat potong dengan spindle, dan lebih lanjut berdampak pada tidak tercapainya ukuran yang disyaratkan. Scrap tersebut menempel karena tidak optimalnya proses pembersihan yang dilakukan oleh mekanisme pembersihan yang ada. Dengan pembuatan automatic tools changer flush, scrab yang menempel dapat diminimalisir. Dengan metode pembersihan yang baru, cacat oversize turun menjadi 0.05%. Selain dampak pada aspek kualitas, potensi biaya untuk proses pengerjaan ulang atau pembuatan kembali produk dapat diminimalisir. Perbaikan aspek kualitas, penurunan biaya dan penurunan waktu proses tercapai melalui implementasi pembuatan alat ini.

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Section: Politeknik Astraunclassified

“…Desember 2022 alat potong dan spindle mesin [5]. Konsentrisitas adalah suatu kondisi dimana titik pusat atau sumbu pusat beberapa benda berada pada satu titik atau satu garis yang sama.…”

Section: Politeknik Astraunclassified

Pembuatan Automatic Tools Changer Flush Untuk Menurunkan Cacat Produk Pada Mesin CNC Milling

T. Wibowo,

Amanullah,

AT Manurung

2023

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“…Parametric studies were conducted to assess the effects of the end plate on the geological conditions with different rock mass qualities, in situ stresses, shearing stiffness at the bolt-grout interface, and stiffnesses of the end plate. Liu et al , He et al, Zhi et al, Fu et al, and Jia et al designed a device which guarantees the bolt in the center of the borehole and increases the mixing uniformity of the anchorage agent in the soft rock roadway because of insufficient support strength and high failure rate of bolt support. The application of these devices can increase the bonding force between anchorage agent and surrounding rock interface, so as to increase the shear capacity between anchorage agent and surrounding rock interface, and then to increase the stability of anchorage system, and reduce the occurrence of bolt failure.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Resin Anchoring with Reaming Bottom and Filling in Soft Rock

et al. 2023

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This paper deals with the problem of the slippage failure of bolts in supporting soft rock, and the anchoring system being pulled out when conventional anchoring methods are used for bolts. This situation seriously threatens the safety of personnel and efficiency of work at the supporting soft rock. The main goal of this paper is to develop methods that will take full advantage of the potentially great supporting force that can be provided by bolts installed in soft rock. The study discusses the resin anchoring technique with reaming bottom and filling and proposes that replacing soft rock with high strength hard rock is an effective method to improve the anchoring force that prevents slip failure. The results of a comparative analysis of the different maximum diameters of reaming and the anchorage performance of the method using laboratory testing, numerical simulation, mechanics analysis, and field test are described. The results show that when the reaming diameter is less than five times that of the borehole, the anchorage force increases significantly. When the reaming diameter is more than five times that of the borehole, the increasing degree of anchoring force decreases obviously and the trend is gentle. The anchoring force of five times resin anchoring with reaming bottom and filling is 2.8 times that of conventional anchorage. The resin anchoring technique with reaming bottom and filling guarantees that bolts installed in soft rock will provide high supporting forces.

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“…The surrounding rock is transformed from brittle to plastic with increasing mining depth due to high stress (Li et al, 2019;Xie et al, 2021). The main methods used to control the gateway surrounding rock include a combination of releasing surrounding rock stress and using a low-cost support instead of improving the support strength involving increasing costs (He et al, 2021;Kang 2021;Wu et al, 2021;Wang et al, 2022b). Pressure-relief drill parameters affect the release of surrounding rock stress and the continuous deformation; selecting proper pressure-relief drill diameters is an important step to control deep gateway surrounding rocks (Gao et al, 2020;Zhang et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and instability analysis of concrete specimens with horizontal holes of different diameters

Fang

Yang²,

Lyu

et al. 2022

Front. Earth Sci.

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Uniaxial compression tests were carried on 12 concrete specimens with six different diameter holes using a rigid test machine, and the stress–strain relationship was analyzed in different hole diameter specimens. The effects of different hole diameters on specimen compression strength, elastic modulus, and Poisson’s ratio were studied, and the failure form and instability mode of concrete specimens with holes of different diameters were evaluated. The results show that the larger the compression strength of the specimen, the larger the axial and horizontal strains. As the hole diameter increased from 0 to 50 mm, the compression strength and elastic modulus reduced. The decreasing trend slowed down, and the relationships between the hole diameter and compression strength, and elastic modulus could be represented by negative liner functions. The Poisson ratio of the specimen increased in waves with the increase in hole diameter from 0 to 50 mm. A crack in the concrete specimen with 0–20 mm diameter hole started at the upper and lower diagonal angles of the hole wall; a crack in the concrete specimen with 30–50 mm diameter hole started at the left and right parts of the hole wall. The instability mode of concrete specimens with horizontal holes of different diameters was divided into shear dislocation instability and planar splitting instability.

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Experimental study on resin-anchored bolt concentricity including a device for more consistent bolt centering

Cited by 12 publications

References 25 publications

Pembuatan Automatic Tools Changer Flush Untuk Menurunkan Cacat Produk Pada Mesin CNC Milling

Pembuatan Automatic Tools Changer Flush Untuk Menurunkan Cacat Produk Pada Mesin CNC Milling

Experimental Study on Resin Anchoring with Reaming Bottom and Filling in Soft Rock

Mechanical properties and instability analysis of concrete specimens with horizontal holes of different diameters

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