Thermal measuring and testing – Temperature measurement – Combined with diverse art device
Reexamination Certificate
2002-04-25
2004-05-25
Gutierrez, Diego (Department: 2859)
Thermal measuring and testing
Temperature measurement
Combined with diverse art device
C374S139000, C073S864610
Reexamination Certificate
active
06739750
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a sampling vessel for thermal analysis of molten metal, and more particularly to a sampling vessel for, when a cast material of cast iron, aluminum, an alloy thereof, or the like is to be produced, thermally analyzing the structure of the cast material in front of a furnace.
When cast iron, a light metal such as aluminum, an alloy thereof, or the like is to be cast, the following method is generally adopted for examining the structure of the melt in front of a furnace. The melt is poured into a sampling vessel for thermal analysis provided with a temperature sensor, and a cooling curve of the melt is obtained from an output of the temperature sensor.
As a sampling vessel of this kind, a so-called cup-type vessel is often used. Such a cup-type vessel includes: a vessel body which is made of a heat resisting material, which has a substantially cylindrical bottomed shape, and which comprises a sample chamber having an opening in an upper end; and a temperature sensor such as a thermocouple which is passed through the bottom wall of the sample chamber to be located in the sample chamber. By using a ladle or a dipper, the melt is poured into the sampling vessel from the furnace in which the metal is molten.
As exemplarily shown in a longitudinal section view of
FIG. 10
, such a conventional cup-type sampling vessel usually has a sample chamber
101
measuring about 30 mm in diameter and about 50 mm in depth. A temperature sensor
102
is placed in a middle portion in depth of the sample chamber
101
, that is, in a position which is separated by about 25 mm from an opening
101
a
in the upper end of the sample chamber
101
.
Another kind of known sampling vessel is a so-called probe-type sampling vessel which is disclosed in Japanese Patent Publication (Kokai) No. 2000-131311. The probe-type sampling vessel comprises: an runner which is adjacent to a sample chamber having an opening in the upper end, the lower end of which is opened, and which communicates with the opening of the sample chamber; an exhaust passage which communicates with the opening of the sample chamber, and the upper end of which is opened in a higher position than the opening of the sample chamber; and a sensor holder which is formed above the sample chamber, and which holds a temperature sensor that is inserted from the opening of the sample chamber into the sample chamber. The sampling vessel has a structure in which these components are integrally formed by a heat resisting material. In the conventional probe-type sampling vessel, the shape and dimensions of the sample chamber are the same as those of the above-described cup-type vessel.
The sampling vessel is produced in the following manner. Two or right and left members respectively having shapes which are formed by dividing the vessel by a dividing plane along the center axis of the sampling vessel, that is, by a dividing plane in the longitudinal direction of the vessel are produced. The members are bonded together in the dividing plane with an adhesive agent.
The probe-type sampling vessel is immersed in the melt, so that the melt is caused to flow into the sample chamber through the runner in which the lower end is opened. In accordance with the flow-in, the air in the interior of the vessel including the sample chamber is exhausted to the outside through the exhaust passage in which the upper end is opened. Accordingly, in the probe-type sampling vessel, the sample chamber can be filled with the melt without using a ladle or a dipper.
In both the above-mentioned conventional cup-type and probe-type sampling vessels, the time required for analysis is relatively long, and the temperature fall rate in eutectic, i.e., the gradient of a cooling curve in eutectic is relatively large. Thus, the vessels involve a problem in that the analytic procedure for determining the eutectic point is complicated.
In the conventional probe-type sampling vessel, the structure is complicated, and the bonding area for the two members is large, thereby producing a problem in that the workability of assembly is poor. Since the two members have a slim shape in which the longitudinal size is larger than the lateral size, each member easily warps during a process of firing the member. Such warping causes a failure to be produced in bonding the two members together. Since the bonding plane exists in a position where the sample chamber is divided into two portions, the adhesive agent may enter in the sample chamber. In this case, the adhesive agent may serve as an impurity to contaminate the melt. For these reasons, it is necessary to provide a large number of inspection steps.
In the conventional probe-type sampling vessel, the exhaust passage is bent in the vessel. When the flow-in melt is cooled, therefore, the metal may obstruct the exhaust passage in the inside thereof, and the gas may not be exhausted. In this case, the sampled melt may be caused by the gas pressure to flow backward or to be diverted, thereby producing the possibility that a predetermined amount of melt cannot be sampled.
Moreover, the conventional probe-type sampling vessel involves an additional problem in that, because of the complication of the inner passage and the large outer dimensions of the whole vessel, a large pushing force is required for immersing the vessel into the melt.
SUMMARY OF THE INVENTION
The invention has been conducted in view of the above-mentioned circumstances. It is a primary object of the invention is to provide a sampling vessel for thermal analysis of molten metal in which the time required for analysis a can be shortened and the temperature change rate in eutectic can be reduced as compared with the conventional cup-type and probe-type sampling vessels, so that the eutectic temperature can be obtained easily accurately for a short time.
It is another object of the invention is to provide a probe-type sampling vessel for thermal analysis of molten metal in which the structure is simple, and the production and inspection steps can be remarkably simplified as compared with the conventional probe-type sampling vessel, and the pushing force required for immersing the vessel into the melt can be reduced.
It is a further object of the invention is to provide a sampling vessel for thermal analysis of molten metal in which there is no possibility that the melt is solidified in the exhaust passage and the air is blocked from being exhausted, as compared with the conventional probe-type sampling vessel.
In order to attain the primary object, the sampling vessel for thermal analysis of molten metal according to the invention is a sampling vessel for thermal analysis of molten metal which is made of a heat resisting material, which has a substantially cylindrical bottomed shape comprising a sample chamber having an opening in an upper end, and in which a temperature sensor is passed through a bottom wall of the sample chamber to be located in the sample chamber, and is characterized in that the sample chamber has a diameter in a range of 16 to 24 mm, and a depth of 36 mm or more, and the temperature sensor is located at a depth in a range of 7 to 22 mm away from the upper-end opening of the sample chamber.
In order to also attain the primary object, the sampling vessel for thermal analysis of molten metal according to the invention is a sampling vessel for thermal analysis of molten metal including: a cylindrical bottomed sample chamber which has an opening in an upper end; a runner which is formed in adjacent to the sample chamber, in which a lower end is opened, and which communicates with the opening of the sample chamber; an exhaust passage which communicates with the opening of the sample chamber, and in which an upper end is opened in a higher position than the opening of the sample chamber; and a sensor holder which is formed above the sample chamber, and which holds a temperature sensor that is inserted into the sample chamber through the opening of the sample chamber, the sample chamber, the runner, the exhaust passage
Gutierrez Diego
Jagan Mirellys
Jordan and Hamburg LLP
Yuwa Co., Ltd.
LandOfFree
Sampling vessel for thermal analysis of molten metal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sampling vessel for thermal analysis of molten metal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sampling vessel for thermal analysis of molten metal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3206278