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4516311 Machining centers 4516311加工中心
International Journal of Machine Tool Design and Research
Pub Date : 1986-01-01 DOI: 10.1016/0020-7357(86)90234-9
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引用次数: 0
4561334 Rotary stripper 4561334旋转剥离机
International Journal of Machine Tool Design and Research
Pub Date : 1986-01-01 DOI: 10.1016/0020-7357(86)90091-0
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引用次数: 0
A study on the superplasticity of brass and its applications 黄铜的超塑性及其应用研究
International Journal of Machine Tool Design and Research
Pub Date : 1986-01-01 DOI: 10.1016/0020-7357(86)90195-2
Lin Fa-yu , Huang Yi-hong , Ruan Feng

This paper studies the conditions for the superplasticity of two CuZn alloys. Tests have been made with commercial HPb 59-1 brass bar and H62 brass bar, which were machined into tensile specimens. Then the specimens were subjected to heat treatment in order to meet the requirement of fine microstructure for superplasticity. Tensile tests have been carried out at different temperatures and tensile rates on a mechanically-operated high-temperature material testing machine.

Tests have shown that the superplasticity of HPb 59-1 brass occurred at a temperature of 620°C and a tensile rate of 0.3 mm min−1 with a ductility of ∼500% without fracture, and that of H62 brass at a temperature of 750°C and a tensile rate of 0.2 mm min−1 with a ductility of ∼624% without fracture.

This paper also studies the relations between the strain-rate and the temperature of the two materials, and makes observations on the microstructural changes in the surfaces of the specimens both before and after the tensile tests, using an optical microscope and a scanning electron microscope.

On the basis of superplastic tensile tests superplastic forming of HPb 59-1 brass is also studied.

研究了两种CuZn合金的超塑性条件。用HPb 59-1黄铜棒和H62黄铜棒加工成拉伸试样进行了试验。然后对试样进行热处理，使其达到微观组织细化的超塑性要求。在机械操作的高温材料试验机上进行了不同温度和拉伸速率下的拉伸试验。试验表明，HPb 59-1黄铜在温度为620℃、拉伸速率为0.3 mm min -1时出现超塑性，延展性为~ 500%而不断裂;H62黄铜在温度为750℃、拉伸速率为0.2 mm min -1时出现超塑性，延展性为~ 624%而不断裂。本文还研究了两种材料的应变速率与温度的关系，并利用光学显微镜和扫描电镜观察了拉伸试验前后试样表面的微观组织变化。在超塑性拉伸试验的基础上，对hpb59 -1黄铜的超塑性成形进行了研究。
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引用次数: 4
An analysis of the forging of spur gear forms 直齿圆柱齿轮成形分析
International Journal of Machine Tool Design and Research
Pub Date : 1986-01-01 DOI: 10.1016/0020-7357(86)90212-X
N.A. Abdul , T.A. Dean

Forging spur gear forms in completely closed cavity dies is investigated by means of an upper bound analysis. A velocity field comprising three unit deformation regions is proposed. The tooth regions are approximated by prismatic rectangular sections. The effects of root diameter, number of teeth and workpiece/die interface friction, on flow and forging pressures, are determined.

Forging pressure without friction is independent of root diameter but increases with the number of teeth. In the presence of friction forging pressure increases with reducing root diameter.

采用上界分析的方法，研究了全封闭模腔内直齿圆柱齿轮的锻造成形问题。提出了一个由三个单位变形区域组成的速度场。牙齿区域由棱柱形矩形截面近似表示。确定了齿根直径、齿数和工件/模具界面摩擦对流动和锻造压力的影响。无摩擦锻造压力与齿根直径无关，但随着齿数的增加而增加。在存在摩擦的情况下，锻造压力随着根直径的减小而增大。
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引用次数: 33
Barreling of a short cylinder in compression 压缩短圆筒的筒状结构
International Journal of Machine Tool Design and Research
Pub Date : 1986-01-01 DOI: 10.1016/0020-7357(86)90214-3
N.K. Gupta , C.B. Shah

Large deformation behaviour of aluminium and low carbon steel short cylinders of various diameters and height to diameter ratios, loaded axially in a simple compression test without using any lubricant, is examined. Typical histories of deformation of the cylindrical surface and the end face are presented with a view to studying the nature and the extent of free surface barreling, its folding into the end face and effects of specimen size thereon. The results reveal that the profile of a deforming specimen can sensibly be approximated by an arc of a circle only after the onset of folding.

在不使用任何润滑剂的情况下，研究了不同直径和高度与直径比的铝和低碳钢短圆柱体在轴向加载时的大变形行为。给出了典型的圆柱面和端面的变形历程，旨在研究自由面筒化的性质和程度、自由面筒化向端面的折叠以及试样尺寸对自由面筒化的影响。结果表明，变形试样的轮廓只有在开始折叠后才能用圆弧近似。
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引用次数: 10
4561350 Soft drink can crusher 4561350软饮料粉碎机
International Journal of Machine Tool Design and Research
Pub Date : 1986-01-01 DOI: 10.1016/0020-7357(86)90092-2
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引用次数: 0
4561383 Birdhouse with cylindrical compartments 4561383带圆柱形隔间的鸟舍
International Journal of Machine Tool Design and Research
Pub Date : 1986-01-01 DOI: 10.1016/0020-7357(86)90093-4
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引用次数: 0
4561050 Method of determining coordinate system in machining center 4561050加工中心坐标系的确定方法
International Journal of Machine Tool Design and Research
Pub Date : 1986-01-01 DOI: 10.1016/0020-7357(86)90083-1
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引用次数: 0
4559707 Error correction system for length measuring device 长度测量装置的误差校正系统
International Journal of Machine Tool Design and Research
Pub Date : 1986-01-01 DOI: 10.1016/0020-7357(86)90069-7
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引用次数: 0
4539876 Machine tool 4539876机床
International Journal of Machine Tool Design and Research
Pub Date : 1986-01-01 DOI: 10.1016/0020-7357(86)90276-3
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引用次数: 0
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