Effects of Countersink Hole on Driving Torques of Screw in Joints Constructed of Medium Density Fiberboard
Öz
Aim of study: The aim of this study was to investigate the effect of
countersink along with some other factors affecting screw driving torques in
joints made of medium density fiberboard (MDF). There is limited research has
been done in the field of screw driving torques in wood based composites. In
all of these studies, the specimen consisted of a single wood-based composite
material and metal plate which was used for the consistency of the screw
driving data. However, in this study, the screw driving torques were obtained
by the specimens consisted of two MDF testing blocks jointed by a screw.
Material and Method: In general, there were two main screw driving
torques; seating torque (SET) and stripping torque (STT). The MDF testing
blocks had dimension of 150 mm long × 75 mm wide and two different thicknesses
were used. For upper testing block, 8-mm-thick MDF and for lower testing block,
18-mm-thick MDF were used. Torques measurements were obtained by an adjustable
torque screwdriver. Factors were embedded screw orientation (face-to-face and face-to-side),
pilot-hole diameter (2.5 and 3.0 mm), pilot-hole depth (12 and 16 mm) and
countersink type (with and without countersink).
Main results: The results of statistical analysis indicated that the
four-way interaction among the embedded screw orientation, screw length,
countersink type and pilot-hole diameter was significant on the mean SET and
STT in the MDF joints.
Highlights: This study will help MDF manufacturers to understand
the screw performance of their products in terms of screw driving torques.
Anahtar Kelimeler
Pilot-hole Diameter and Depth Embedded Screw Orientation Torque Wrench Countersink Hole
Destekleyen Kurum
Kastamonu University
Proje Numarası
KUBAP01/2017-58
Teşekkür
This study was founded by the Kastamonu University, Kastamonu, Turkey (grant number KUBAP01/2017-58).
Kaynakça
- ASTM D1761-06 (2010). Standard test method for mechanical fasteners in wood. American Society for Testing and Materials, West Conshohocken, PA.
- ASTM D 4442-92 (2010). Standard test methods for direct moisture content measurement of wood and wood-base materials. American Society for Testing and materials, West Conshohocken, PA.
- ASTM D1037-06 (2010). Standard test methods for evaluating properties of wood-base fiber and particle panel materials. American Society for Testing and materials, West Conshohocken, PA.
- Carroll, M. N. (1972). Measuring screw withdrawal with a torque wrench. Forest Products Journal, 22(8), 42-46.
- Didriksson, E. I. E., Nyren, J. O. & Back, E. L. (1974). The splitting of wood-base building boards due to edge screwing. Forest Products Journal, 24(7), 35-39.
- Kuang, F., Xing, Y., Wu, Z. & Zhang, J. (2017). Characteristics of screwdriving torques in wood-plastic composites. Wood and Fiber Science, 49(2), 206-218.
- Robert, A.M. (2012). Plastic part design for injection molding: An introduction. Hanser Publications, Cincinnati, Ohio. pp. 381-384.
- SAS 9.4. (2014). SAS users’ guide. SAS Institute, Cary, NC.
- Tor, O., Yu, X. & Zhang, J. (2015). Characteristics of torques for driving screws into wood based composites. Wood and Fiber Science, 47(1), 2-16.
- Tor, O. (2019). Effects of pilot hole diameter on screw-driving torques in medium density fiberboard. CERNE, 25(1), 54-59.
- Yu, X., Tor, O., Quin, F., Seale, D. & Zhang, J. (2015). Screw-driving torques in particleboards. Wood and Fiber Science, 47(2), 17-30.
Öz
Çalışmanın amacı: Bu çalışmada, orta yoğunluklu lif levhalarda (MDF) havşa deliği ve bazı
faktörlerin vidalama tork değerleri üzerine etkileri araştırılmıştır. Bu konu
ile ilgili yapılan önceki çalışmalarda, ahşap esaslı malzemelerde vidalama
torklarının ölçülebilmesi için metal bir plaka ile kullanılmıştır. Ancak, bu
çalışmada vidalama tork değerleri direk olarak iki MDF numunesi alından ve
yüzeyden olmak üzere birleştirilerek elde edilmiştir.
Materyal ve Yöntem: Vidalama torkları incelendiğinde iki vidalama torku ön plana çıkmaktadır.
Birisi vidanın malzemeye tam olarak oturduğu anda ki vidalama torku (SET)
diğeri ise vidanın malzeme içerisinde boşta dönmesinden hemen önce ki maksimum
tork (STT) olarak adlandırılır. MDF deney örnekleri 150 mm uzunluğunda ve 75 mm
eninde kesilmiştir. 8 ve 18 mm olarak iki farklı kalınlık kullanılmıştır.
Vidalama torkları ayarlanabilir tork anahtarı ile ölçülmüştür. Bu araştırmada
ki faktörler şu şekildedir; vidalama yönü (malzemenin yüz ve alın kısmı), kılavuz
deliği çapı (2.5 ve 3.0 mm), kılavuz deliği derinliği (12 ve 16 mm) ve havşa
deliğinin durumu (havşalı ve havşasız).
Sonuçlar: İstatistiksel analiz sonuçlar, vidalama yönü, kılavuz deliği çapı ve
derinliği ve havşa deliğinin durumu arasında ki dörtlü etkileşimin anlamlı
olduğunu göstermiştir.
Önemli Vurgular: Bu çalışma, MDF panel
üreticilerinin malzemelerinde ki vidalama performansları hakkında önemli
bilgiler vermektedir.
Anahtar Kelimeler: Kılavuz Deliği ve Derinliği,
Vidalama Yönü, Tork Anahtarı, Havşa Deliği
Anahtar Kelimeler
Kılavuz Deliği ve Derinliği Vidalama Yönü Tork Anahtarı Havşa Deliği
Proje Numarası
KUBAP01/2017-58
Kaynakça
- ASTM D1761-06 (2010). Standard test method for mechanical fasteners in wood. American Society for Testing and Materials, West Conshohocken, PA.
- ASTM D 4442-92 (2010). Standard test methods for direct moisture content measurement of wood and wood-base materials. American Society for Testing and materials, West Conshohocken, PA.
- ASTM D1037-06 (2010). Standard test methods for evaluating properties of wood-base fiber and particle panel materials. American Society for Testing and materials, West Conshohocken, PA.
- Carroll, M. N. (1972). Measuring screw withdrawal with a torque wrench. Forest Products Journal, 22(8), 42-46.
- Didriksson, E. I. E., Nyren, J. O. & Back, E. L. (1974). The splitting of wood-base building boards due to edge screwing. Forest Products Journal, 24(7), 35-39.
- Kuang, F., Xing, Y., Wu, Z. & Zhang, J. (2017). Characteristics of screwdriving torques in wood-plastic composites. Wood and Fiber Science, 49(2), 206-218.
- Robert, A.M. (2012). Plastic part design for injection molding: An introduction. Hanser Publications, Cincinnati, Ohio. pp. 381-384.
- SAS 9.4. (2014). SAS users’ guide. SAS Institute, Cary, NC.
- Tor, O., Yu, X. & Zhang, J. (2015). Characteristics of torques for driving screws into wood based composites. Wood and Fiber Science, 47(1), 2-16.
- Tor, O. (2019). Effects of pilot hole diameter on screw-driving torques in medium density fiberboard. CERNE, 25(1), 54-59.
- Yu, X., Tor, O., Quin, F., Seale, D. & Zhang, J. (2015). Screw-driving torques in particleboards. Wood and Fiber Science, 47(2), 17-30.
Ayrıntılar
| Birincil Dil | İngilizce |
|---|---|
| Bölüm | Makaleler |
| Yazarlar | |
| Proje Numarası | KUBAP01/2017-58 |
| Yayımlanma Tarihi | 30 Eylül 2019 |
| Yayımlandığı Sayı | Yıl 2019 Cilt: 19 Sayı: 2 |
Kaynak Göster
