公开(公告)号：US3973950A

公开(公告)日：1976-08-10

申请号：US612946

申请日：1975-09-12

申请人： Tetsuro Itoh ,  Tetsuo Takahashi ,  Kiyoichi Yamano

发明人： Tetsuro Itoh ,  Tetsuo Takahashi ,  Kiyoichi Yamano

IPC分类号： C22C38/00 ,  C22C38/60

CPC分类号： C22C38/60

摘要： Low carbon calcium-sulfur containing free-cutting steel exhibiting improved machinability is disclosed. The said steel consists essentially of 0.03 to 0.10% carbon, up to 0.3% silicon, 0.8 to 1.5% manganese, 0.04 to 0.10% phosphorus, 0.20 to 0.45% sulfur, 0.0003 to 0.0050% calcium and the remainder being iron and inherent impurities such as copper, nickel, chromium and nitrogen; and is prepared by regulating the composition of the steel so that the value of theoretical Brinell hardness of the steel matrix, which is determined on the basis of the content of carbon, silicon, manganese, phosphorus, sulfur, copper, nickel, chromium and nitrogen in the steel, to a value between 110 and 130, and by forming and maintaining in the range of from 100 to 500 grams per steel-ton oxide inclusions of type JIS-A2 (ASTM-C) which soften or fuse at a temperature not higher than 1400.degree.C.

摘要翻译： 公开了具有改善的机械加工性的低碳含钙硫的自由切削钢。 所述钢基本上由0.03％至0.10％的碳，至多0.3％的硅，0.8至1.5％的锰，0.04至0.10％的磷，0.20至0.45％的硫，0.0003至0.0050％的钙，其余为铁和固有杂质 如铜，镍，铬和氮; 并且通过调节钢的组成，使得基于碳，硅，锰，磷，硫，铜，镍，铬和氮的含量确定的钢基体的理论布氏硬度值来制备 在钢中的值为110〜130，并且通过在不产生温度的条件下软化或熔化的JIS-A2型（JIS-C）的每钢铁氧化物夹杂物形成并保持在100〜500克范围内 高于1400℃

公开(公告)号：US5369240A

公开(公告)日：1994-11-29

申请号：US831543

申请日：1992-02-05

申请人： Tetsuro Itoh

发明人： Tetsuro Itoh

IPC分类号： B23H1/06

CPC分类号： B23H1/06

摘要： An electrode for an electric discharge machining apparatus of the type in which a workpiece is machined by generating an electric discharge across a machining gap between a confronting electrode and the workpiece through a machining solution includes a matrix of a first conductive material and a plurality of crystalline semi-crystalline or amorphous particles of a second conductive material for promoting a plurality of discharge sites for the electric discharge, the particles being uniformly dispersed throughout void spaces of the matrix. The particle sizes and weight ratio of the first and second conductive materials are established so as to provide an optimal discharge site density in the exposed surfaces of the electrode.

摘要翻译： 一种用于放电加工设备的电极，其中通过机械加工溶液在相对的电极和工件之间的加工间隙上产生放电而加工工件的电极包括第一导电材料和多个晶体的基体 用于促进放电的多个放电部位的第二导电材料的半结晶或无定形颗粒，所述颗粒均匀分散在基体的空隙空间中。 建立第一和第二导电材料的粒度和重量比，以便在电极的暴露表面中提供最佳的放电部位密度。

公开(公告)号：US5276302A

公开(公告)日：1994-01-04

申请号：US884130

申请日：1992-05-18

申请人： Tetsuro Itoh

发明人： Tetsuro Itoh

IPC分类号： B23H7/18 ,  B23H1/02

CPC分类号： B23H7/18

摘要： A method for controlling an electric discharge machining apparatus of the type in which a workpiece is machined by generating an electric discharge across a machining gap between a confronting electrode and the workpiece through a machining solution while feeding the electrode towards the workpiece includes the steps of determining current removal rate of material from the workpiece, calculating current removal efficiency based on the current removal rate and average machining current applied to the electrode, comparing the current removal efficiency with an optimal removal efficiency corresponding to peak current applied to the electrode, and when the current removal efficiency is less than or equal to a predetermined percentage of the optimal removal efficiency, adjusting at least one of a plurality of machining parameters to increase the current removal efficiency. According to one aspect of the present invention, the machining parameters include average machining current, the ON time of an applied voltage pulse, the circulation rate induced by a jump operation of the electrode and the flow rate of machining solution in the machining gap. The optimal removal efficiency values used in the inventive method are determined experimentally.

摘要翻译： 一种控制放电加工装置的方法，其中通过在将电极朝向工件供给的同时通过机械溶液在相对的电极和工件之间的加工间隙上产生放电而加工工件的方法包括以下步骤： 根据当前去除率和施加到电极上的平均加工电流计算电流去除效率，将电流去除效率与对应于施加到电极的峰值电流的最佳去除效率进行比较，以及当 电流去除效率小于或等于最佳去除效率的预定百分比，调整多个加工参数中的至少一个以增加电流去除效率。 根据本发明的一个方面，加工参数包括平均加工电流，施加电压脉冲的接通时间，由电极的跳跃操作引起的循环速率和加工间隙中的加工溶液的流速。 实验中确定了本发明方法中使用的最佳去除效率值。

公开(公告)号：US4115111A

公开(公告)日：1978-09-19

申请号：US761954

申请日：1977-01-24

申请人： Tetsuro Itoh ,  Tetsuo Takahashi ,  Atsuyoshi Kimura ,  Seiichi Yamano

发明人： Tetsuro Itoh ,  Tetsuo Takahashi ,  Atsuyoshi Kimura ,  Seiichi Yamano

IPC分类号： C22C38/60

CPC分类号： C22C38/60

摘要： The present invention relates to a free-cutting structural steel for machines characterized by containing a range of 30-100 g/steel ton of oxide inclusions mainly composed of SiO.sub.2 40-60%, CaO 13-30% and Al.sub.2 O.sub.3 25-40%, the balance being less than 20% of other oxides and calcium 0.0002-0.0010%, and at least one of the following elements; lead 0.03-0.30% and sulfur 0.035-0.10%.

摘要翻译： 本发明涉及一种用于机器的自由切割结构钢，其特征在于包含主要由SiO 2 40-60％，CaO 13-30％和Al 2 O 3 25-40％组成的30-100g /钢吨氧化物夹杂物的范围， 余量小于其他氧化物和钙0.0002-0.0010％的钙的20％，以及至少一种以下元素; 铅0.03-0.30％，硫0.035-0.10％。

公开(公告)号：US5369239A

公开(公告)日：1994-11-29

申请号：US884131

申请日：1992-05-18

申请人： Tetsuro Itoh

发明人： Tetsuro Itoh

IPC分类号： B23H1/02 ,  B23H7/16 ,  B23H7/18

CPC分类号： B23H1/02

摘要： A touch-type sensor is employed to detect the precise location of a corner of a machining electrode that may be susceptible to pyrographite buildup prior to actual machining of a workpiece. By detecting the precise location in this manner, a base or origin value can be maintained for subsequent comparison when the electrode is periodically checked for icicle formation or electrode erosion. When a deviation from the base or origin value is determined, one or more of a plurality of machining parameters, such as machining on time, wear ratio, fluid flow rate, or jumping height is modified in accordance with the amount of deviation detected. In order to further optimize the machining rate of the workpiece, the surface area of the electrode is periodically determined. The aforementioned machining parameters are varied accordingly, so that the optimum average current across the inter-electrode gap, as it relates to surface area, may be maintained. Furthermore the temperature at the surface of the machining electrode can be periodically determined. As the temperature at the surface approaches the critical temperature for pyrographite buildup and the like, the machining parameters can be modified to achieve the optimum machining rate.

摘要翻译： 触摸型传感器用于检测加工电极的角部的精确位置，该加工电极的拐角在工件的实际加工之前可能易于产生热解图。 通过以这种方式检测精确的位置，当电极周期性地检查冰柱形成或电极腐蚀时，可以保持基极或原点值用于随后的比较。 当确定与基座或原点值的偏差时，根据检测到的偏差量修改多个加工参数中的一个或多个，例如时间上的加工，磨损比，流体流速或跳跃高度。 为了进一步优化工件的加工速度，周期性地确定电极的表面积。 上述加工参数相应地变化，从而可以维持横跨电极间隙的最佳平均电流，因为它涉及表面积。 此外，可以周期性地确定加工电极表面的温度。 随着表面温度接近辉光积聚等临界温度，可以修改加工参数以达到最佳的加工速度。

公开(公告)号：US5315087A

公开(公告)日：1994-05-24

申请号：US844182

申请日：1992-03-02

申请人： Tetsuro Itoh

发明人： Tetsuro Itoh

IPC分类号： B23H1/08 ,  B23H7/34 ,  B23H7/02 ,  B23H7/08

CPC分类号： B23H1/08 ,  B23H7/34

摘要： A wirecut electrical discharge machining apparatus having silicon particles suspended in a dielectric solution that fills the machining gap. The silicon particles may be suspended in the dielectric solution prior to a machining operation or they may be mixed with the dielectric solution directly in the machining gap. Also, a silicon-coated electrode may be utilized. The silicon overcomes many of the limitations associated with conventional dielectric solutions, by allowing more uniformity of conductivity.

摘要翻译： 一种线切割放电加工装置，其具有悬浮在填充加工间隙的电介质溶液中的硅颗粒。 硅颗粒可以在加工操作之前悬浮在电介质溶液中，或者它们可以直接与加工间隙中的电介质溶液混合。 此外，可以使用硅涂覆的电极。 通过允许更均匀的导电性，硅克服了与传统电介质溶液相关的许多限制。