Heat treatment apparatus
a heat treatment apparatus and heat treatment technology, applied in heat treatment apparatus, lighting and heating apparatus, furniture, etc., can solve the problems of workpiece uniform cooling, workpiece heat generation and other problems, and achieve the effect of reducing the contact area between the workpiece and other parts and restraining the heat treatment strain in the workpi
Inactive Publication Date: 2015-10-01
DOWA THERMOTECH
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- Abstract
- Description
- Claims
- Application Information
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Benefits of technology
The present invention provides a heat treatment apparatus that can hold a workpiece in a proper position during carburizing and quenching treatments while reducing the contact area between the workpiece and other parts. This allows for uniform temperature change in the workpiece and results in high dimensional accuracy after treatment. The apparatus also helps to restrain heat treatment strain and allows for uniform carburizing and quenching treatment of the workpiece.
Problems solved by technology
However, in a conventional carburizing and quenching treatment apparatus, a mounting position of the workpiece may shift from the intended mounting position when the workpiece is mounted on the mounting table.
In this case, during a heating process of the workpiece, the distance between the periphery of the workpiece and a heat source (e.g., induction heating coil) become nonuniform so that the workpiece cannot uniformly be heated.
Further, during cooling of the workpiece in the quenching treatment, the workpiece cannot uniformly be cooled because of the shift in the position.
Therefore, the carburizing and quenching treatment for the workpiece might not uniformly be carried out.
Recently, it has become apparent that when the temperature change in the workpiece is not uniform, a large heat treatment strain is produced, which results in failure to satisfy dimensional accuracy required for the workpiece.
Regarding the transportation and mounting of the workpiece, when a contact area between a transport mechanism or a mounting table and the workpiece is large, the temperature change in the contact portion differs from the other portion of the workpiece, which might cause a large heat treatment strain resulting in failure to satisfy a dimensional accuracy required for the workpiece.
Further, since a contact area between the workpiece and the transportation fork or a contact area between the workpiece and a mounting table is large and partial, temperature change (temperature distribution) in a workpiece will not be uniform.
Therefore, the degree of thermal expansion and contraction in a workpiece varies which produces heat treatment strain to cause deformation of the workpiece.
This might result in failure to keep the dimensional accuracy within a predetermined range after carburizing and quenching.
However, in recent years, some workpieces require particularly strict dimensional accuracy after carburizing and quenching.
It has become apparent that for such workpieces, it is difficult to satisfy the requirement by the method of carrying out carburizing and quenching treatment for a plurality of workpieces in a tray.
Method used
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Embodiment Construction
[0025]An embodiment of the present invention will be described based on a heat treatment apparatus 1 for carrying out vacuum carburizing and quenching treatment for a circular workpiece W below. Note that, the circular workpiece indicates a workpiece having a column shape or a ring shape, or a workpiece formed of a circular top portion and a cylindrical side portion, that is, a workpiece having a circular shape such as a lid, a tray, and a bowl. Specifically, a mechanical part such as a gear is an object to be treated. Further, in the specification and the drawings, a component having essentially the same functional configuration is appended with the same reference sign to omit repeated description.
[0026]As illustrated in FIG. 1, the heat treatment apparatus 1 includes a vacuum sealable treatment room 2 for carrying out a predetermined treatment for a workpiece, a transportation mechanism 3 for transporting the workpiece W into the treatment room or out of the treatment room, and a ...
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Abstract
The present invention provides a heat treatment apparatus for carrying out heat treatment for a circular workpiece. The heat treatment apparatus includes a treatment room configured to carry out a predetermined treatment for the workpiece, a transportation mechanism configured to transport the workpiece into the treatment room and out of the treatment room, and a mounting table on which the workpiece transported into the treatment room is mounted. The transportation mechanism is provided with a transportation arm which mounts and transports the workpiece. The transportation arm is provided with at least three transport support pins which support the workpiece when the workpiece is transported, and the mounting table is provided with at least three mounting table support pins which support the workpiece.
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a heat treatment apparatus for carrying out carburizing and quenching treatment for a workpiece.[0003]2. Description of the Related Art[0004]Generally, to improve wear resistance of a low alloy steel or the like (hereinafter referred to as “workpiece”), carburizing treatment and quenching treatment are carried out to allow the surface layer of the workpiece to interstitially absorb carbon.[0005]An example of a conventional carburizing and quenching treatment apparatus includes such carburizing and quenching treatment apparatuses disclosed in Japanese Patent Application Laid-Open No. H10-53809, Japanese Patent Application Laid-Open No. 2010-266176, Japanese Patent Application Laid-Open No. 2003-183728, and Japanese Patent Application Laid-Open No. H8-285462. As for carburizing and quenching treatment apparatuses described in Japanese Patent Application Laid-Open No. H10-53809, Japanese Pa...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C23C8/80C21D1/18C21D1/62C23C8/20
CPCC23C8/80C21D1/62C21D1/18C23C8/20C21D1/06C21D1/74C21D1/773C21D9/32C23C8/22F27D7/06F27D2099/0015Y02P10/25
InventorHATANAKA, HOKUTO
OwnerDOWA THERMOTECH