摘要:
A steel composition, in which, Si content is regulated to a given range and Nb and Cu or Ni, Mo are compositively added, and a recrystallization annealing is carried out to form an internal oxide layer just beneath a surface of a steel sheet and a surface oxide simultaneously formed on the surface of the steel sheet is removed by pickling. As a result, the formation of oxides of Si, Mn and the like is considerably decreased on the surface of the steel sheet in a subsequent heating before plating because the above internal oxide layer acts as a diffusion barrier. Thus, there can be obtained high tensile strength hot-dipped steel sheets having a considerably excellent plating property.
摘要:
The hot dip Zn galvanized steel sheet has excellent balance between tensile strength and ductility and excellent coating adhesion, an average composition of a base steel thereof includes: 0.05-0.25 mass % of C; not more than 2.0 mass % of Si; 1.0-2.5 mass % of Mn; and 0.005-0.10 mass % of Al, wherein the C content at the base steel surface layer portion right under a coating layer is not more than 0.02 mass %, the base steel structure contains not less than 50% of martensite phase, the martensite phase including both tempered martensite phase and fine size martensite phase, and the remaining portion of the base steel structure being formed by ferrite phase and residual austenite phase. A method of producing the hot dip Zn galvanizing steel sheet is described.
摘要:
Galvannealed steel sheet and method, made by applying hot-dip galvanizing to a steel sheet, heating at a heating rate of at least about 10° C./second to a maximum sheet temperature within a range of from about 470 to 550° C., and applying an alloying treatment; the Al content XAl% in the hot-dip galvannealing layer and the coating weight W g/m2 satisfy the following equation (1); thereby producing a Zn—Fe galvannealing layer having an iron content of from about 7 to 12%; the galvannealed steel sheet has intensities of &zgr;-phase, &dgr;1-phase and &Ggr;-phase that satisfy the following equations (4) and (5) as observed through X-ray diffraction with the galvannealing layer peeled off the galvannealed steel sheet at the galvannealing/steel sheet interface, and the galvannealed steel sheet having excellent press workability, having a whiteness and a glossiness within prescribed ranges: 5≦W×(XAl−0.12)≦15 (1) I(&zgr;:1.26)/I(&dgr;1:2.13)≦0.02 (4) I(&Ggr;:2.59)/I(&dgr;1:2.13)≦0.1 (5).
摘要翻译:通过对钢板进行热浸镀锌而制成的热浸镀锌钢板和方法,以至少约10℃/秒的加热速度加热到最大板温度在约470〜550℃的范围内。 ,并进行合金化处理; 热浸镀锌层中的Al含量XAl%和涂布重量W g / m2满足下式(1)。 从而制造铁含量为约7-12%的Zn-Fe合金化合金层; 合金化热镀锌钢板具有如下的等式(4)和(5)的强度:z相,δ1相和Ggr相,如通过X射线衍射所观察到的,合金化退火层从合金化热镀锌钢板上剥离 合金化退火/钢板界面以及具有优异的压制加工性的合金化热浸镀锌钢板,其白度和光泽度在规定范围内:
摘要:
A tubular object manufacturing method comprising the steps of applying liquid heat-resistant resin containing an inorganic filler as desired onto an outer surface or inner surface of a core member which is a shaping mold to thereby form a coating layer, solidifying or hardening the applied liquid heat-resistant resin until the coating layer becomes strong enough to maintain at least a structure of the tubular object, and taking the tubular object out from the core member. In the method, liquid heat-resistant resin with a viscosity of 10 to 15000 poise at 25.degree. C. is continuously fed by means of a dispenser onto the outer surface or inner surface of the core member while rotating the core member, and a feeder part of the dispenser is moved in the direction of a rotation axis of the core member so that the fed liquid heat-resistant resin is helically wound to thereby form the coating layer. Tubular objects obtained by the manufacturing method is excellent in thickness precision, less in resin loss, and capable of being given desired thickness distribution in the axial direction as necessary.
摘要:
A process for producing a fixing roller comprising coating a fluorine resin dispersion onto a core by using a transfer coating apparatus comprising a transfer roller equipped with a fluorine resin dispersion temperature controller, a coating pan containing a fluorine resin dispersion, a driving system for revolving the core, and a core carrying mechanism for shifting the core, in which the core is brought close to the transfer roller at a gap allowing the core to pick up the fluorine resin dispersion having been picked up from the coating pan onto the transfer roller, and after a prescribed amount of the fluorine resin dispersion is transferred onto the core, the gap between the core and the transfer roller is widened by shifting the core away from the transfer roller thereby to separate the core from the transfer roller, the coating apparatus further comprising a thin plate on both sides of the transfer roller for preventing the fluorine resin dispersion in contact with both ends of an effective coating width of the core from migrating to the inside of the effective coating width while the gap is widened.
摘要:
A fixing roller for use in the fixing stage of a fixing apparatus such as a copying machine provided with multiple rubber and/or fabric layers of certain thicknesses and hardnesses surrounding a core member to improve the copying characteristics of the roller.
摘要:
A release agent applicator for use with a copying machine providing even application of the release agent to a fixing roll of a plain paper copying machine with little leakage of the release agent. A porous polyethylene tetrafluoride resin tube is accommodated in a divided-type support composed of two members which, when joined together, form a longitudinally extending opening having a width smaller than the maximum width of a cavity formed inside the support. The major portion of the outer surface of the porous resin tube is in contact with abutting walls of the cavity to be sealed thereby, and the remaining portion of the tube surface extends outwardly through the support opening to provide a release agent outlet. Both the porous tube and the support may be provided with air inlets having the diameter greater than the diameters of the pores in the porous tube to introduce air into the interior of the porous tube. Further, the porous tube may be initially covered with a film of a polymer having a low melting point. When the applicator is used for the first time, the normal heating of the fixing roll melts the polymer and readies the tube for use.
摘要:
An apparatus for fixing a toner image by transporting a toner image bearing material as it is held between a fixing roll and a compression roll. In the apparatus, which is positioned above the fixing roll, a release agent having a viscosity of 50 to 100,000 cS is applied onto the surface of the fixing roll through a porous fluorocarbon resin membrane having a pore size of 0.01 to 10 .mu.m, a porosity of 35 to 85%, and a thickness of 50 .mu.m to 1 mm. The porous membrane may be located on the inner surface of the bottom of a tank containing the release agent above an opening in the tank bottom.
摘要:
An engine balancer includes a pair of balancer shafts and a balancer housing for housing the balancer shafts, and is placed in an oil pan at the bottom of an engine. The balancer housing includes a pair of front and rear bearing walls respectively supporting the balancer shafts with rolling bearings interposed therebetween. The bearing walls of the balancer housing are attached to bearing walls for a crankshaft. The housing body has an aperture at the top thereof. The aperture of the housing body is covered with a plate-shaped cover member thinner than a member forming the housing body.