直浇道

研究了镁合金负压消失模铸造中，模样材料、试样尺寸、浇注温度、涂料厚度、直浇道高度以及真空度等因素对AZ91镁合金流动性的影响。

Influence of several parameters , including pattern material , sample size , pouring temperature , coating thickness , sprue height and vacuum rate , on the fluidity of AZ91 Mg alloy by EPC-V is studied .

对于小型熔模铸件，直浇道的截面形状将影响其工艺出品率。

The sprue sections influence the technological yield of small castings in investment casting .

消失模铸造直浇道掉砂问题的研究

The research of dropping sand in the vertical pouring path of EPC

陶瓷空心管在消失模直浇道上的应用

Application of Hollow Ceramic Pipe on the Sprue on EPC

直浇道截面形状对精铸件工艺出品率的影响

Influence of Sprue Section on Technological Yield in Investment Casting

该系统包括压铸模浇注系统的直浇道、横浇道、内浇口、溢流槽和排气槽。

The system includes sprue , runner , gate , overflow launder , venting launder .

液态金属流经直浇道时的吸气、撇渣原理及应用

The Principle of Gas Absorption and Slag Removal About Liquid Metal Having Through Sprue and Its Application

为减少铸铝件的针孔，铝合金消失模铸造应有适当高的浇注温度和合适的直浇道高度及面积，并尽量采用空心直浇道。

To decrease the casting pinholes , there should be higher pouring temperature and a suitable sprue height and area .

在相同的浇注温度下，施加电磁搅拌后，浇道内的温度分布比未施加搅拌时变得均匀，降低了直浇道堵塞的可能性，从而可以实施低温浇注。

Under the same condition of pouring temperature , temperature distribution of molten metal in the nozzle is more uniform with N-EMS .

一定的直浇道长度及直浇道面积有利于提高铝液的充型速度。

It will be helpful to improving the filling velocity when the sprue length and sprue areas are controlled to some extent .

浇注温度越高、直浇道空心面积率越大，铝液充型速度越快。

The higher the pouring temperature or the larger the sprue hollow area rate is , the faster the filling velocity of molten aluminum is .

选用低熔点Sn-3.5%Pb合金浇注试样，用实验方法研究直浇道电磁搅拌对铸坯凝固组织的影响，并用数值模拟作为辅助手段分析了影响因素。

The effect of N EMS on solidification structure of continuously cast metal of Sn 3.5 % Pb alloy has been investigated by experiments and numerical analyses .

据此对生产现场作了工序调查，发现浇注温度过高和直浇道欠浇是引起成分偏析及组织缺陷并导致断裂的主要原因。

Working procedure causes were found out , poured short in sprue downgate and higher pour temperature is primary reason after investigating casting process in pouring house .

使用时只需将浇口杯底部的内台阶孔插在消失模的直浇道上即可。

When the runner cup is used , the inner stepped hole arranged at the bottom of the runner cup is inserted into the downsprue of the lost foam .

认为高的直浇道对提高充型能力意义不大，浇注温度超过800℃会使充型能力下降。

The results show that the higher sprue has no favor effect on the molding filling capacity . The mold filling capacity will be lowered while the pouring temperature is higher than 800 ℃.

在浇注系统设计时，避免金属液冲击型腔，避免铸件直浇道横浇道形成框形结构等也是避免热裂的有效措施。

Some effective measures to prevent hot tear , including avoidance of liquid metal to impact mold cavity and of casting-sprue-runner to form rectangular structure , were proposed during design of gating system .

消失模铸造金属液在填充铸型初期的流动接近失重状态，且直浇道越高越接近失重态。

It was concluded that flowage of liquid metal at the beginning period is in the state of weightlessness in the process of pouring in evaporated pattern casting , and is closer to weightlessness state with vertical path higher .

直浇道、横浇道和内浇道截面比为1∶3∶5，并配合带缓冲结构的合理缝隙，可保证型腔内液面上升平稳，减少铸件内部二次氧化夹杂和混入性气体；

The 1 ∶ 3 ∶ 5 cross sectional area ratio of the sprue , runner and gate and the rational fissure with cushion structure make the molten metal fill stably in the mould cavity , that reduce the secondary oxide inclusion and the invading gas ;

通过分析实型铸件分层缺陷的特征及其形成机理，认为在各种因素中，阶梯式浇注系统底层内浇道截面积小于直浇道截面积是分层缺陷形成的关键。

This paper analyzes the characteristic of layer defect in the full mold casting and its forming mechanism , of all above factors the key of forming layer defect is section area of the internal gate in the bottom of the step gating system smaller than the down gate .

给出了直一内二单元浇注系统内浇口出流的实际作用压头和速度的计算公式，并对直浇道的正压充满程度进行了定量分析。

The sprue keeps full or not and the fulling extent in pressure or non-pressure can be quantitatively calculated and practically controlled .