摘要:
A wire electric discharge machine and a wire electric discharge machining method in which a workpiece set posture is compensated for an error. After a workpiece is set and fixed on a workpiece table, an upper guide measures three or more three-dimensional positions that are not situated on one straight line on an upper surface of the workpiece, utilizing detection of contact with the upper surface. A unit normal vector Nincl (Xn, Yn, Zn) is obtained, and a shift amount Δshif (ΔU, ΔV) for shift from an originally set vertical position (U0, V0) to a corrected position (Uc, Vc) is calculated. In machining, the shift amount Δshif (ΔU, ΔV) is added to the position (U0, V0) to compensate for an angle error of a machined surface, and a deviation of a machined point position caused by inclination of the workpiece is collaterally compensated for as required by correcting the upper and lower wire guides. Thus, the machined shape cannot be distorted, and the workpiece set posture error can be compensated for.
摘要:
A cement dispersant composed of water-soluble vinyl copolymers which include specified kinds of constituent units at specified ratios and of which the weight average molecular weight pullulan converted by GPC method is 15000-150000 and the ratio of weight average molecular weight to number average molecular weight is 2-7 is used together with cement, aggregates and water to produce concrete with the water-to-cement ratio of 20-45%.
摘要:
A cut contour display method in a wire electric discharge machine for subjecting a workpiece to taper cutting by moving a workpiece relative to a wire electrode and moving a wire tensioning guide horizontally has a first step of entering a programmed path (WDP) lying on the lower surface of the workpiece, workpiece thickness, data including a taper angle or a vector indicating a positional offset between the upper and lower surfaces of the workpiece, and data specifying a number of cross-sectional contours. A second step includes obtaining a wire electrode path (WUP) on the upper surface of the workpiece, which is not a programmed surface, by using the programmed path (WDP), workpiece thickness, and the taper angle or vector indicative of the positional offset. A third step includes obtaining coordinate values of points on each cross-sectional contour at an end portion of each block by using data indicative of the wire electrode paths on the upper and lower surfaces of the workpiece and the number n of cross sections. A fourth step includes displaying, on a display unit, the wire electrode paths on the upper and lower surfaces of the workpiece, as well as each cross-sectional contour of the taper-cut surface, by using the data indicative of the wire electrode paths on the upper and lower surfaces of the workpiece and coordinate values of the points on each cross-sectional contour at the end portion of each block.
摘要:
A taper cutting method for inserting a cut surface having a frustoconical shape between first and second taper-cut surfaces is adapted to cut a corner contour in which first and second circular arcs are smoothly connected to respective wire paths on upper and lower workpiece surfaces of a first tapered surface, and in which there is a smooth connection from end points of the first and second circular arcs to respective wire paths on the upper and lower workpiece surfaces of a second tapered surface.
摘要:
A method of electric discharge machining using a wire electrode for cutting a workpiece into a commanded shape by producing an electric discharge between the workpiece and the wire electrode and moving the wire electrode relative to the workpiece along a commanded path. The method includes steps of previously storing, in a computer memory, sets of machining conditions which differ depending upon workpiece material and thickness, reading, at the time the workpiece is to be machined, a predetermined set of the machining conditions from the memory in response to a machining condition selection instruction in a machining program and performing electric discharge machining in accordance with the set of machining conditions read from the memory.
摘要:
A data update system in a bubble memory in which, to preserve the simultaneity of data in the event of a power failure during the updating of data in the bubble memory, initialization data is written into a specific data storage area of the bubble memory the initialization data indicates that the data in a first data storage area is invalid, and new data is subsequently written into the first data storage area from a first record to a last record successively under the control of a bubble memory controller. The initialization data is thereby erased after the new data is completely written in the first data storage area, after which the new data, written in the first data storage area, is again written into a second data storage area from the first record to the last record thereof.
摘要:
A method and apparatus used to compensate for thermal displacement and to correct a positional error caused by the thermally induced displacement of a spindle positioned in response to a numerical control system. The amount of thermally induced displacement of the spindle, at a predetermined point in time after application of electric power to the machine tool, is stored in a memory. When the spindle is to be positioned in response to numerical control data, the commanded amount of spindle movement is compensated by using the amount of thermally induced displacement stored in the memory, and the spindle is then positioned on the basis of the compensated commanded amount of movement.
摘要:
A multi-functional admixture for simultaneously providing specified characteristics to hydraulic cement compositions such as concrete contains one or more of specified reaction mixtures obtained by specified two processes as well as partially or completely neutralized substances obtained from such a reaction mixture through a specified third process. The specified two processes include initiating a radical copolymerization process of a radical polymerizable monomer mixture containing maleic anhydride and a monomer of a specified kind in a non-aqueous system in the presence of a non-aqueous radical initiator and stopping the radical copolymerization reaction in its midst while the inversion rate of polymerization is at a specified level by adding water to the reaction system to thereby obtain a reaction mixture. The specified third process is for partially or completely neutralizing the reaction mixture.
摘要:
A high-strength hydraulic cement composition contains cement, fine aggregates, coarse aggregates, water and a specified admixture and has a unit amount of water in the range of 120-185 kg/m3. Water and the cement are contained at a ratio of 20-40% and the admixture is contained in the amount of 0.1-3.0 weight parts per 100 weight parts of the cement. The admixture is one or more selected from reaction mixtures obtained by specified two processes and partially or completely neutralized substances obtained from such a reaction mixture through these two processes and also a specified third process. The specified two processes include initiating a radical copolymerization process of a radical polymerizable monomer mixture containing maleic anhydride and a monomer of a specified kind in a non-aqueous system in the presence of a non-aqueous radical initiator and stopping the radical copolymerization reaction in its midst while the inversion rate of polymerization is at a specified level by adding water to the reaction system to thereby obtain a reaction mixture. The specified third process is for partially or completely neutralizing the reaction mixture.
摘要翻译:高强度水硬性水泥组合物含有水泥,细骨料,粗骨料,水和特定混合物,单位量为120-185kg / m 3以上的水。 水和水泥的含量为20-40%,混合物的含量为每100重量份水泥0.1-3.0重量份。 该混合物是选自通过两种方法获得的反应混合物和通过这两种方法从这种反应混合物获得的部分或完全中和的物质以及特定的第三种方法中的一种或多种。 指定的两个方法包括在非水系自由基引发剂的存在下,在非水系统中引发含有马来酸酐和特定种类的单体的自由基聚合性单体混合物的自由基共聚方法,并将其中的自由基共聚反应停止 同时通过向反应体系中加入水从而获得反应混合物,聚合反转速率在规定的水平。 指定的第三种方法是部分或完全中和反应混合物。
摘要:
A high-strength hydraulic cement composition contains cement, fine aggregates, coarse aggregates, water and a specified admixture and has a unit amount of water in the range of 120-185 kg/m3. Water and the cement are contained at a ratio of 20-40% and the admixture is contained in the amount of 0.1-3.0 weight parts per 100 weight parts of the cement. The admixture is one or more selected from reaction mixtures obtained by specified two processes and partially or completely neutralized substances obtained from such a reaction mixture through these two processes and also a specified third process. The specified two processes include initiating a radical copolymerization process of a radical polymerizable monomer mixture containing maleic anhydride and a monomer of a specified kind in a non-aqueous system in the presence of a non-aqueous radical initiator and stopping the radical copolymerization reaction in its midst while the inversion rate of polymerization is at a specified level by adding water to the reaction system to thereby obtain a reaction mixture. The specified third process is for partially or completely neutralizing the reaction mixture.
摘要翻译:高强度水硬性水泥组合物含有水泥,细骨料,粗骨料,水和特定混合物,单位量为120-185kg / m 3以上的水。 水和水泥的含量为20-40%,混合物的含量为每100重量份水泥0.1-3.0重量份。 该混合物是选自通过两种方法获得的反应混合物和通过这两种方法从这种反应混合物获得的部分或完全中和的物质以及特定的第三种方法中的一种或多种。 指定的两个方法包括在非水系自由基引发剂的存在下,在非水系统中引发含有马来酸酐和特定种类的单体的自由基聚合性单体混合物的自由基共聚方法,并将其中的自由基共聚反应停止 同时通过向反应体系中加入水从而获得反应混合物,聚合反转速率在规定的水平。 指定的第三种方法是部分或完全中和反应混合物。