Gonda Metal Industry Co.

Sagamihara, Japan

Gonda Metal Industry Co.

Sagamihara, Japan
SEARCH FILTERS
Time filter
Source Type

Patent
Gonda Metal Industry Co. | Date: 2017-04-17

A manufacturing method for a cast bar and tube made of a magnesium alloy, includes steps of preparing a manufacturing device; depressurizing a vacuum chamber through a depressurization device; heating a vicinity of an opening of a hollow tube; inserting the opening of the hollow tube into a molten metal; switching a valve member to be open; introducing the molten metal into a cylindrical part, and filling the cylindrical part with the molten metal; cooling the hollow tube; and continuously vibrating the hollow tube until completing solidification of the molten metal in the cylindrical part.


Fujisawa S.,Chuo University | Yonezu A.,Chuo University | Noda M.,Gonda Metal Industry Co. | Xu B.,University of Virginia
Journal of Engineering Materials and Technology, Transactions of the ASME | Year: 2017

Magnesium (Mg) alloys have been widely used in automotive and aerospace industries due to its merits of exceptional lightweight, super strong specific strength, and high corrosion-resistance, where intermetallic compounds with a small volume are very critical to achieve these excellent performance. This study proposes a reverse analysis that can be employed to extract elastoplasticity-dependent creep property of commercial diecast Mg alloys and their intermetallic compounds from instrumented indentation with two sharp indenters. First, the creep deformation that obeys the Norton's law (ϵ=Aσn) is studied, and the parameters of A and n are determined from two indentation experiments conducted with different sharp indenters. Then, a numerical algorithm and dimensional function developed is extended to extract the elastoplasticity of various metallic materials by focusing on the loading stage of indentation experiments. By considering the full loading history with both linear increase and holding stages of loads, we propose a framework of reverse analysis to determine both elastoplasticity and creep properties simultaneously. Parallel indentation experiments on pure magnesium and aluminum and Mg alloys are performed, and the results agree well with the numerical predictions. Copyright © 2017 by ASME.


Ito T.,Gonda Metal Industry Co. | Yanagihara S.,Gonda Metal Industry Co. | Noda M.,Gonda Metal Industry Co. | Mori H.,Railway Technical Research Institute
Keikinzoku/Journal of Japan Institute of Light Metals | Year: 2015

The effect of heat treatment and dynamic recrystallization (DRX) on the microstructure, mechanical properties and limited reduction in thickness of the as cast Mg-10Al-0.2Mn-1Ca mass% (AMX1001) alloy was investigated in this study. The Mg17Al12 phases and Al-Ca compounds appeared in the as cast alloy. The Mg17Al12 phase mostly dissolved into the Mg matrix, and Al2Ca compound dispersed discontinuously surrounding the grain boundaries. The area fraction of the compounds in the heat treatment material decreased from 16% to 4% with increasing annealing temperature after the optimized heat treatment at 490°C for 6 h. Tensile strength and elongation of 253 MPa and 8% respectively were observed after heat treatment DRX occurred during the hot upsetting test of heat treated AMX1001 alloy with Al2Ca compounds at the newly formed DRXed grain boundaries. With the decrease of compounds and increase of upsetting test temperature, the limited reduction in thickness of AMX1001 cast alloy reached 50%. Because of consider an alternate rephrasing as the dispersion of fine Al2Ca compound receiving the promotion of fine Al2Ca compound and introduction of shear deformation associated with the processing, the area fraction of the DRXed grains was increased.


Ito T.,Gonda Metal Industry Co. | Noda M.,Chiba Institute of Technology | Mori H.,Railway Technical Research Institute | Gonda Y.,Gonda Metal Industry Co. | And 2 more authors.
Materials Transactions | Year: 2014

We investigated the effect of the cooling rate and molten metal temperature on the microstructure and mechanical properties of a subrapidly solidified magnesium alloy, Mg10Al0.2Mn1Ca, prepared by antigravity suction casting using a water-cooled steel mold. The microstructure of the antigravity-suction-cast material without water cooling consisted of coarse grains (grain size: 780 μm), with networks of an AlCa compound at the grain boundaries. The higher cooling rate of the water-cooled steel mold promoted the formation of the AlCa compound and voids in accordance with increases in the internal and external temperature gap and differences in the solidification rate of the mold. The formation of voids and the shrinkage were suppressed, however, by adjusting the cooling rate and decreasing the molten metal temperature. The particle size of the Mg phase was refined to 135μm and the grain-boundary compounds were finely dispersed in the Mg phase. The as-cast alloy showed an ultimate tensile strength of 166 MPa and an elongation of 8%. The microstructure and mechanical properties of the as-cast alloy were dependent on the cooling rate and molten metal temperature, but they were not dependent on the casting speed. ©2014 The Japan Institute of Metals and Materials.


Funami K.,Chiba Institute of Technology | Noda M.,Chiba Institute of Technology | Gonda Y.,Gonda Metal Industry Co. | Gonda G.,Gonda Metal Industry Co. | Mori H.,Railway Technical Research Institute
8th Pacific Rim International Congress on Advanced Materials and Processing 2013, PRICM 8 | Year: 2013

Twin-roll-cast AMX magnesium alloys have recently been developed as a lightweight flame retardant alloy for use in automotive and railway vehicles. However, magnesium alloys containing Ca show inferior plastic deformation and poor formability. In this study, we have developed an extraordinarily high strength and elongation rare-earth-free magnesium alloy by multi-pass rolling of a Mg-10Al-0.2Mn-1Ca (wt.%) twin-roll-cast alloy. The as-rolled sample exhibited a yield stress of 380 MPa, tensile strength of 400 MPa, and elongation to failure of 8 % as a result of grain refinement. The recrystallized region of the rolled material accounted for 70 %, and the mean grain size was 1.4 μm. In addition, excellent rollability was found over a wide range of rolling temperatures, with the maximum reduction in the thickness being twice as large as that in other magnesium alloys containing Ca.


Saito N.,Japan National Institute of Advanced Industrial Science and Technology | Suzuki K.,Japan National Institute of Advanced Industrial Science and Technology | Fukuda Y.,Gonda Metal Industry Co. | Ito T.,Gonda Metal Industry Co. | And 3 more authors.
Keikinzoku/Journal of Japan Institute of Light Metals | Year: 2016

Effects of Al concentration and Zn addition on microstructures and mechanical properties of Mg-Al-(Zn)-Ca series magnesium (Mg) alloy medium plates were investigated. Concerning to mechanical properties of AMX (Mg-Al-Ca) alloys with various Al concentrations, which were processed by rolling at 523 K and final annealing at 473 K, good balance of tensile strength and failure elongation were obtained, when Al concentration was 8 mass%. When Al concentration was more than 9 mass%, however, both tensile strength and failure elongation were deteriorated due to coarsening of Al-Ca compounds. Concerning to mechanical properties of AZX (Mg-Al-Zn-Ca) alloys with various Al concentrations and 1 mass% Zn addition, which were processed by the same procedure with AMX alloys, enhancement of tensile strength without deterioration of failure elongation was attained at Al concentration of 6-8 mass%, when the tensile direction was parallel to the rolling direction. Clear deterioration in failure elongation compared with AMX alloys were observed, however, when the tensile direction was perpendicular to the rolling direction. 1 mass%Zn addition to AMX alloy promoted precipitation of fine Mg17Al12 particles, which likely affected mechanical properties. In addition, solid solution of Zn in AMX alloy likely contributed to enhancement of tensile strength. © 2016 The Japan Institute of Light Metals.


Yatsushiro K.,Yamanashi Industrian Technology Center | Suzuki D.,Yamanashi Industrian Technology Center | Sano M.,Yamanashi Industrian Technology Center | Ishiguro T.,Yamanashi Industrian Technology Center | And 4 more authors.
Zairyo/Journal of the Society of Materials Science, Japan | Year: 2014

For the application to the structure part of the magnesium alloy, material evaluations such as mechanical strength, fatigue property and property of stress corrosion cracking are necessary. Therefore, the X-ray stress measurement that is Non-destructive inspection is effective technique. However, there are few reports that described X-rays stress measurement about magnesium alloy. The report considered about X-ray elastic constant and stress constant in detail is not found. In this report, X-ray elastic and stress constants of rolled AZ61 magnesium alloy were measured. As result, by removing surface layer that has anelastic behavior and considering texture of specimen, X-ray elastic and stress constants can be measured. The X-ray elastic constants of AZ61 magnesium alloy in as received specimens were 41.2 GPa by using 1014 diffraction and 39.9 GPa by using 1015 diffraction. © 2014 The Society of Materials Science, Japan.


A manufacturing device for a cast bar and tube includes a molten metal furnace for holding a dissolved casting material, a hollow tube having a penetrating part of molten metal for penetrating molten metal, a depressurization device for reducing the pressure, a connection member for connecting the hollow tube to the depressurization device, and an open/close type valve member installed on the connection member. The penetrating part of molten metal is depressurized by switching the valve member to the closed state to reduce the pressure in the side of the depressurization device from the valve member using the depressurization device and inserting an opening of the hollow tube into the molten metal furnace as well as by switching the valve member to the open state.


Patent
Gonda Metal Industry Co. | Date: 2015-11-25

A manufacturing device for a cast bar and tube has a molten metal furnace 10 for holding a dissolved casting material and a penetrating part 23 of molten metal for penetrating molten metal, and is provided with a hollow tube 20 which can be freely inserted into and withdrawn from the molten metal furnace 10, a depressurization device 30 for reducing the pressure, a connection member 40 for connecting the hollow tube 20 to the depressurization device 30, and an open/close type valve member 50 installed on the connection member 40, and the penetrating part 23 of molten metal is depressurized by switching the valve member 50 to the closed state to reduce the pressure in the side of the depressurization device 30 from the valve member 50 using the depressurization device 30 and inserting an opening 25 of the hollow tube 20 into the molten metal furnace 10 as well as by switching the valve member 50 to the open state, thereby penetrating molten metal into the penetrating part 23 of molten metal under reduced pressure to solidify the penetrated molten metal in the penetrating part 23 of molten metal to manufacture a long belt-like member. This allows for easily yielding a cast bar or a cast tube which is utilized as a material for casting process and plastic working at low cost and in a short time.

Loading Gonda Metal Industry Co. collaborators
Loading Gonda Metal Industry Co. collaborators