Abstract: Provided is a cleaning member, comprising an elastic member that includes polyurethane, wherein: when tan ? of a test piece sampled from the elastic member is measured in the temperature range of ?20° C. to +60° C., the peak temperature of a peak indicating the maximum value of tan ? is at 15.0° C. or below; the maximum value of tan ? is 0.20 to 0.55; tan ? at a temperature of 55° C. is 0.13 or larger; and where the detected quantity of all ions obtained when the test piece is heated at a rate of temperature increase of 10° C./second to 1000° C. using a direct-sampling mass spectrometer is M1 and the integrated intensity of a peak in a derived ion thermogram that corresponds to a range of m/z values originating in multifunctional isocyanate with at least three isocyanate groups is M2, M2/M1 is at least 0.001.

Abstract: An electrochemical machining device improves a roughness of a machined surface while keeping a relative scanning speed of a tool electrode with respect to a workpiece low. A power source applies a voltage, for making current for electrochemical machining flow, between a tool electrode and a workpiece. The tool electrode is arranged apart from the workpiece and is capable of being scanned relatively along a surface direction of the workpiece. An electrolytic solution supply section supplies electrolytic solution for electrochemical machining between the tool electrode and the workpiece. The charge control means eliminates an electrical charge that has accumulated between the tool electrode and the workpiece using an appropriate method.

Abstract: This invention is to offer the metal mold for injection molding and the metal mold for diecast molding with an excellent temperature controlling property that can be manufactured with lower manufacturing cost and shorter manufacturing time. The purpose of this invention is to offer the method to use the metal mold for injection molding capable of producing accurate products. The metal mold 1 for injection molding has the fixed metal mold part 2 configured by processing, layering and bonding a plurality of metal plates 10, the movable metal mold part 4 configured by processing, layering and bonding a plurality of metal plates 13, and the temperature controlling passages 3 and 5 formed by processing, layering and bonding a plurality of metal plates 10 and 13 in at least, one of the fixed metal mold part 2 and the movable metal mold part 4.

Abstract: A magnetic attraction system grinding method and apparatus comprised of arranging a magnetic circuit forming means between an abrasive tool and a workpiece, thereby generating a grinding pressure required to grind the surface of the workpiece, and performing the operation of the abrasive tool through a rectilinearly reciprocating movement or rotary movement working along the workpiece surface during the application of grinding pressure while controlling either grinding speed or grinding stroke. The magnetic circuit is produced with an electromagnet or permanent magnet assembly and the abrasive tool may be a magnetic material bonded grindstone.