Abstract:
Provided are a side member from which a clad member for heat exchanger exhibiting excellent productivity and corrosion resistance while preventing poor adhesion can be produced in production of a clad member for heat exchanger by controlling the surface state and flatness, a method for producing the side member, and a method for producing a clad member for a heat exchanger by using the side member. A side member (A) consists of a core material and one or more layers of side member (A) applied onto one side or both sides thereof and being used in a clad member for a heat exchanger, wherein a plurality of periodic forms (B) of fine groove which become arcuate toward one direction of the side member (A) is formed on the surface of the side member (A). The periodic form (B) of fine groove extends up to the outer circumferential edge of the side member (A) with a radius of curvature of 800-1500 ram and has a period (D) of 1-8 mm in the above-mentioned direction of the side member (A) and surface roughness of the side member (A) in the above-mentioned direction of 1-15 μm 10-point average roughness (Rz).
Abstract:
The present invention provides a method for manufacturing a clad material and the equipment for manufacturing the clad material, in which the productivity is excellent, the surface state and the flatness of the clad material can be readily controlled and the deterioration in adhesion rarely occurs in the clad material. The method for manufacturing the clad material composed of a core material and one or more skin materials which are superposed on either one or both faces of the core material includes: a clad material preparation process where an ingot for core material, which is manufactured by dissolving and casting a metal for core material in a core material preparation process, and an ingot for skin material, which is manufactured by dissolving and casting a metal for skin material different from the core material in their component composition, in a skin material preparation process, are prepared, respectively; a superposition process where the ingot for skin material is superposed as a skin material at a predetermined position of either one or both faces of the ingot for core material to manufacture a superposed material; and a clad hot-rolling process where the superposed material is hot-rolled to manufacture a clad material.
Abstract:
A powered trap door device for a vehicle including a trap door hinged at a floor of a vestibule with steps of the vehicle and a sliding vehicle door. A screw driving mechanism that opens/closes the trap door and is driven by an electric motor with an electromagnetic brake. A first limit switch for detecting opening of the sliding door of the vehicle. A second limit switch for detecting closing of the trap door, the trap door being openable only when the sliding door is opened and the sliding door being closable only when the trap door is closed. A sensor of a periphery monitoring system provided on the vestibule to check safety of a peripheral area of the trap door, wherein the trap door can be opened/closed by the electric motor with the electromagnetic brake after the periphery monitoring system has checked safety.
Abstract:
A steel which consists essentially of 0.25-0.65% of C, up to 2.50% of Si, up to 2.00% of Mn, 10.00-20.00% of Cr, 4.00-13.00% of Co, 1.00-3.00% of Al, up to 0.25% of N and the balance essentially Fe and ordinary impurities and satisfies the relation:Cr equivalent=-40C(%)+6Si (%)-2Mn(%)+Cr(%)-2Co(%)-30N(%)+12Al(%).ltoreq.13%provides a metal mold which need not be Cr-plated and is suitable of use in molding high-quality glass wares.