• Title/Summary/Keyword: Plunge Depth

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Effect of Tool Plunge Depth on Weldability of Dissimilar Al5083-O/DP590 Friction Spot Joint (이종재 Al5083-O/DP590 마찰교반점용접시 툴의 삽입깊이(Plunge Depth)가 용접성에 미치는 영향)

  • Jeong, Su-Ok;Bang, Han-Sur;Bang, Hee-Seon
    • Journal of Welding and Joining
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    • v.34 no.3
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    • pp.17-22
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    • 2016
  • In terms of mechanical and metallurgical characteristics, the effect of tool plunge depths(0.2, 0.5, 0.7, 1.0, 1.5mm) on weldability in dissimilar Al5083-O/DP590 friction spot joint has been clarified. From the results, it is found that the stirred nugget was stably formed at a plunge depth of more than 0.7mm, which is caused by improved stirring action against each other material. With increasing a plunge depth, the thickness of intermetallic compound(IMC) layer in Al5083-O/DP590 joint has a tendency to increase. The tensile shear strength reaches to the maximum failure load of 6.5kN at a plunge depth of 0.7mm due to relatively small decrease in the thickness of Al5083-O sheet and relatively minute thickness of IMC layer, compared with those of other plunge depth conditions.

Behavior of Two Dimensional Density Flow into a Reservoir with Sloping Bottom (경사정지수역으로 유입되는 2차원 밀도류의 거동)

  • 윤태훈;전시영
    • Water for future
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    • v.20 no.3
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    • pp.237-245
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    • 1987
  • The behavior of negative buoyant flow into a reservoir with sloping bottom is analysed by numerical solution technique of the governing equations composed of continuty, momentum and constituent transport equation. The stable plunge point and maximum travel distance are found to be dependent on the bottom slope of reservoir as well as inflow densimetric Froude number, $Fr_e$. They are also related closely to a vortex formed just downstream from the plunge point and above the underflow. The plunge depth was shown to be a function of th bottom slope and $Fr_e$. The plunge depths obtained in this numerical study agree relatively well with published data and theoretical studies, and its predictive equation is derived.

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Monitoring of Grinding Force in Plunge Grinding Process (원통 플런지 연삭시 연삭력에 관한 실험적연구)

  • Park, Jong-Chan;Park, Cheol-Woo;Lee, Sang-Jo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.23 no.6 s.165
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    • pp.881-894
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    • 1999
  • Cylindrical plunge grinding is widely used for final machining process of precision parts such as automobile, aircraft, measurement units. But in order to make parts which have high precision accuracy and high surface integrity, it is necessary to consider grinding characteristics due to accumulation phenomena of grinding wheel in plunge grinding process. In this study, in order to examine closely plunge grinding process, grinding power, grinding force, real depth of cut are monitored in transient state, steady state and spark out state. As the result, it is shown that grinding power and force are affected by dressing condition, depth of cut and speed ratio and that there exist threshold grinding force and it also affected by dressing condition. Also considered effects of grinding conditions on surface roughness and roundness of workpiece

A Study on the Grinding Force Characteristics in the Internal Plunge Grinding (내면 플런지 연삭에 있어서 연삭력 특성에 관한 연구)

  • Seo, Young-Il;Her, Man-Seung;Choi, Hwan;Lee, Jong-Chan;Cheong, Seon-Hwan
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.12
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    • pp.54-59
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    • 1999
  • High precision internal plunge grinding is difficult because of the decrease in the quill stiffness due to the small diameter of wheel. In this paper, the characteristics of internal plunge grinding were investigated. Grinding experiments were performed at various grinding conditions with vitrified bonded CBN wheels. The grinding period was assumed to be consisted of rough grinding and fine grinding. The classification of grinding was determined int terms of the normal grinding forces and actual depth of cut. The experimental results indicate that the higher depth of cut and infeed speed result in the longer rough grinding time. The maximum normal grinding force was nearly equal to the static force and it decreases exponentially as the grinding continues.

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Effects of Welding Conditions and Material Arrangement on Tensile Properties of Friction Stir Lap Welded of Dissimilar Al Alloy, A5J32/A5052 (A5J32/A5052 이종 알루미늄 합금 겹치기 마찰교반접합부의 인장성질에 미치는 재료배열 및 접합조건의 영향)

  • Yoon, Tae-Jin;Kang, Myung-Chang;Kang, Chung-Yun
    • Journal of Powder Materials
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    • v.20 no.4
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    • pp.302-307
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    • 2013
  • A5J32-T4 and A5052-H32 dissimilar aluminum alloy plates with thickness of 1.6 and 1.5 mm were welded by friction stir lap welding (FSLW). The FSLW were studied using different probe length tool and various welding conditions which is rotation speed of 1000, 1500 rpm and welding speed of 100 to 600 mm/min and material arrangement, respectively. The effects of plunge depth of tool and welding conditions on tensile properties and weld nugget formation. The results showed that three type nugget shapes such as hooking, void, sound have been observed with revolutionary pitch. This plunge depth and material arrangement were found to effect on the void and hooking formation, which in turn significantly influenced the mechanical properties. The maximum joint efficiency of the FSLWed plates was about 90% compared to base metal, A5052-H32 when the A5052-H32 was positioned upper plate and plunge depth was positioned at near interface between upper and lower plates.

Prediction of Scour Potential Distributions in a Shallow Plunge Pool (얕은 감세지내의 세굴능 분포형태의 예측)

  • 손광익
    • Water for future
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    • v.27 no.3
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    • pp.35-43
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    • 1994
  • Because a failure to provide enough plunge pool depth can create a risk to the structural stability of the psillways or dams, many researchers have proposed experimental formulas for claculating ultimate scour depth under jet issued from spillways and pipe culverts. For the design purposes of a plunge pool, scour potential distribution is important as much as the ultimate scour depth is. In this study scour potential distributions near the jet impinging point on a porous plane which can simulate a real cohesionless movable flat bed has been measured. Experimental results showed that scour potential distributions are geometrically similar to each other provided the angle of jet impact was the same. Statistical analysis of experimental results showed that scour potential distributions for the design purposes of a plunge pool could be expressed by a single equation within a range of this experiment. The proposed formula for the prediction of scour potential distributions agrees well with experimental measurements.

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A Study on the Comparison of Internal Plunge Grinding and Internal Thrust Grinding (내면 플런지 연삭과 스러스트 연삭의 비교)

  • Choi, Hwan;Seo, Chang-Yeon;Seo, Young-Il;Lee, Choong-Seok
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.15 no.1
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    • pp.68-73
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    • 2016
  • In this paper, the grinding characteristics in internal grinding methods(plunge, thrust) were studied with vitreous CBN wheels using machining center. Grinding experiments were performed according to the same material removal rate conditions such as a wheel speed, depth of cut and workpiece speed. And the grinding force, machining error and grinding ratio were investigated though these experiments. Based on the experimental results, the grinding characteristics on internal grinding methods were compared.

Effect of workpiece speed in ultra high speed cylindrical plunge grinding (초고속 원통 플런지연삭에서 공작물속도의 영향)

  • 주종길;박규열
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.10a
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    • pp.961-964
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    • 1997
  • In this paper, grinding characteristics of ultra high speed cylindrical plunge grinding was investigated by use of vitrified CBN wheel. From the experimental result, it was convinced that grinding power is decreased according to the increase of wheel and workpiece speed due to changing of grinding mechanism which decreases depth of cut and length of contact curve according to increment of wheel speed. And also, stock removal reduction of each gram lead to improvement of surface roughness by increasing the wheel speed.

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Tensile Strength Application Using a Definitive Screening Design Method in Friction Stir Welding of Dissimilar Cast Aluminum and High-Strength Steel with Pipe Shape (파이프 형상의 이종 주조알루미늄-고장력강의 마찰교반용접에서 확정선별설계법에 의한 인장강도 응용)

  • Choy, Lee-jon;Park, Seong-Hwan;Lee, Myung-Won;Park, Jae-Ha;Choi, Byeong-Joon
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.19 no.10
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    • pp.98-104
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    • 2020
  • Recently, friction stir welding of dissimilar materials has become one of the biggest issues in lightweight and eco-friendly bonding technology. In this study, a lightweight torsion beam axle, which is an automobile chassis component, was used in the welding to cast aluminum material. The friction stir welding process of A357 cast aluminum and FB590 high-strength steel as well as the effects of the process parameters were investigated and optimized using a novel definitive screening design (DSD). ANOVA was used to predict the importance of the process parameters with 13 degradation experiments using the proposed DSD. Also, FSWed experiments were conducted using an optical microscope analysis to investigate the tensile strength behavior in the weld area. In addition to determining the interaction between the tool's rotational speed and the plunge speed, results indicate that the influence of the plunge depth was the most significant.