Using self-feeding in solidification can make good surface quality, no shrinkage casting defects of castings; the technology product yield of the casting greatly increases. 利用凝固过程自补缩,可使铸件表面质量好,无缩孔、缩松等铸造缺陷,工艺出品率大大提高。
Research on Process Characteristic of High-gloss Surface Part Injection Technology: Warpage, Shrinkage and Sink Index 高光注射成型工艺特性研究:翘曲、收缩与沉降指数
It was found in the production practice with using kiss gating-feeder, that some defects including top surface depression and shrinkage at kissing area etc. 在使用压边浇冒口的生产实践中,由于化学成分、浇注温度、压边宽度、长度和冒口体积等选取不当,易造成铸件顶面凹陷、冒口根部缩孔、缩松等缺陷。
The casting is easy to suffer from deformation, surface sink and internal shrinkage. 该铸件容易变形和产生表面缩凹、部缩孔。
AFM Analysis of Surface Nanostructure and Polymerization Shrinkage Properties of Three Types of Composite Resins 3种口腔复合树脂表面纳米结构与聚合收缩的AFM分析
There easily exists shrinkage porosity due to superheat of ingate root in large plain parts investment casting. Ingot defects may be broadly classified into internal flaws and surface flaws. Internal flaws are caused by shrinkage. 大平面铸件常在内浇道根部出现过热,在该处产生缩松缺陷。钢锭缺陷广义上可分为内部缺陷和表面缺陷。内部缺陷是因收缩引起的。
Solve the surface shrinkage of plastic products completely. 彻底解决塑料产品的表面缩水现象。
Ingot defects may be broadly classified into internal flaws and surface flaws. Internal flaws are caused by shrinkage. 钢锭缺陷广义上可分为内部缺陷和表面缺陷。内部缺陷是因收缩引起的。
The results have shown that addition of non-organic filling might effectively solve the problems of felt disclosure, decrease the surface shrinkage cave spots and improve the product smoothness. 结果表明,加入无机填料可有效解决GMT制品露毡问题,减小了表面收缩凹斑,提高了制品表面光泽度。
The causes and relative factors of the surface shrinkage trace for injected products are discussed, and the design ideas of preventive and remedial measures are presented. 探索注塑制品表面产生缩痕的成因及其相关因素,提出了预防性设计思想及补救措施。
Unbound aggregate base can efficiently retard the reflexion of cracks to asphalt pavement surface, which is aroused by the shrinkage crack of semi-rigid base in the inverted structure. 半刚性基层沥青路面作为过渡层时,可以有效改善半刚性基层收缩裂缝的反射裂缝的发生。
This paper presents the researches about impacts of the contents, kinds, particle sizes of non-organic filling on surface shrinkage, sunken spots and smoothness of GMT products. The mechanical properties of GMT filled with non-organic fillings are also tested. 研究了无机填料的含量、种类、填料粒径对GMT制品表面收缩、凹斑和光泽度的影响,测试了无机填料填充的GMT的力学性能。
The acquired achievements are as follows: On the basis of the theories of solid deformation and solid surface energy, developing a coal matrix shrinkage model that indicates the effects of the deformation of coal matrix shrinkage on the porosity and permeability of fractures. 1基于固体变形理论与固体表面能理论,建立煤基质收缩或膨胀变形与煤裂隙渗透率和孔隙度关系的数学模型。
The breaking strength σ b, relative elongation δ and fracture surface shrinkage ψ of butt joint by light beam brazing are lower than those of brazed base material. 光束钎焊对接接头的断裂强度σb、相对延伸率δ、断面收缩率ψ均低于被钎焊母材。
In I-24-hour-R-12-hour MDQ group, cells were found well adhering to the wall, the surface was smooth without shrinkage and cleavage cells were observed. 缺氧24h再灌注12h中浓度清开灵组细胞贴壁良好,表面光滑,未发生皱缩,可见分裂期细胞。
Edge collapse, honeycomb and surface voids in the slipform paving cement concrete and shrinkage of hardening concrete used in highways are studied in this paper, which is a part of western traffic project, frost resistance of cement concrete, supported by traffic ministry of China. 本文针对交通部西部交通项目水泥混凝土抗冻融耐久性能研究中高速路面混凝土滑模施工过程中的塌边和麻面以及硬化混凝土收缩等现象展开研究。
The crack of big volume reinforced concrete base mainly consistes of surface temperature crack and vertical shrinkage crack. 大体积钢筋砼基础裂缝主要有表面温度裂缝和垂直收缩裂缝。
Radial shrinkage in beryllium ring is the same far from the brazing seam, but within 1 mm from the brazing seam, outer surface is outward expand and inner surface is inward shrinkage. 远离钎缝区域,铍环内外表面同时发生向内的径向收缩,离钎缝1mm范围内,铍环外表面向外膨胀,内表面继续向内收缩;
Formation Reason and Prevention of Surface Shrinkage Depression and Cavity of Gray Iron Castings 灰铸铁件表面缩陷和缩孔的产生及防止
In the view of the process parameter that influences the sintering surface roughness, dimension precision of PS part and the surface roughness and shrinkage being guideline, the 3-factor and 3-horizontal orthodoxy experiment is designed and processed. 针对影响烧结聚苯乙烯制件表面粗糙度和尺寸精度的工艺参数,以制件表面粗糙度和收缩为测量指标,设计并进行了三因素三水平正交试验。
Investigation was carried out on the compatibility between two shrinkage reducing agents and four superplasticizers on the solution surface tension, the slump, strength, free shrinkage of concrete and mortar. 研究了两种减缩剂与四种减水剂复合后对溶液表面张力、混凝土坍落度、混凝土强度、混凝土自由收缩和砂浆收缩的相容性问题。
Research results: Pier concrete surface max tensile stress caused by concrete shrinkage and drop in temperature or heat of hydration is much greater than the split total stress of the dead and live load and exceed the concrete tensile intensity. 研究结果:混凝土收缩和降温或水化热产生的墩身混凝土表面最大拉应力远远大于恒载加活载的劈裂应力,超出混凝土的抗拉强度。
When castings solidify as a sequence manner and squeeze force effectively acts on the surface of the liquid metal, the shrinkage porosities in the castings are eliminated and mechanical properties are increased obviously. 采取措施使铸件以顺序方式凝固,并使挤压力有效地作用在液体金属上,可以消除大高径比铸件内的缩松,获得高力学性能的铸件。
There is a good linear relationship between shrinkage strain and relative humidity reduction in different depths of concrete. However, the surface layer concrete has a lower shrinkage than the internal layer concrete when they reach the same relative humidity. 各混凝土试件中不同位置处的干燥收缩变形和相对湿度降低间的关系呈现明显的线性关系;在达到相同湿度时,距离干燥表面较近的表层混凝土的收缩值小于内层混凝土。
However, before the use of life, most of the road in our country have appeared serious structural damage. The reason for asphalt surface reflective cracks caused by semi-rigid shrinkage crack become an urgent problem to be solved. 但是国内大部分道路未达到使用年限就出现严重的结构性破坏,其主因是半刚性基层开裂引起的反射裂缝。
The lower temperature used the longer drying time took, but the material surface hardening shrinkage was less and the apparent quality was better. 干燥温度越低则干燥时间越长,但物料表面皱缩硬化现象小,表观质量较好。
Using the finite element method, to analyze the surface layer of asphalt added gravel base case temperature shrinkage cracking. 运用有限元基层裂缝模型分析了有沥青面层时基层温缩开裂情况。
The surface reaction layer and linear shrinkage met the accuracy requirements of dental demands. 该合金铸造时表面反应层和铸造线收缩率能够满足口腔修复支架的精度要求。
Mold temperature is the main impact factor for the surface layer shrinkage. Similarly, it can reduce shrinkage by keeping relatively low mold temperature. 模具温度主要影响表层的收缩率,较低的模具温度能减小表层的收缩率。