JP3068961U - Molten metal sampler - Google Patents

Abstract

(57) [Summary] [Object] To provide a molten metal sampler that does not generate large burrs on a metal sample. A lower surface of a sprue member is engaged with an upper surface of a sample case so as to close an upper portion of a sample chamber. The gate member 21 includes a substantially funnel-shaped inflow chamber 5 and a substantially cylindrical flow path 54. The flow path 54 extends in the axial direction of the sprue member, and has one end communicating with the sample chamber 12 and the other end communicating with the small diameter portion of the inflow chamber 5. The substantially funnel-shaped inflow chamber 5 has a large-diameter portion near the outer peripheral surface of the gate member and a small-diameter portion at the center of the gate member.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a molten metal sampler for collecting molten metal from a metal melting furnace to produce a cylindrical or disk-shaped sample for component analysis. The molten metal sampler is used by being immersed in the molten metal, filling the sample chamber with the molten metal, and then pulling it up from the molten metal.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, there have been known various types of molten metal samplers which are connected to an operation holder or the like and used for sampling a molten metal from a metal melting furnace to produce a cylindrical or disk-shaped analysis sample. FIG. 6 is a perspective view of a generally cylindrical sample 4 taken, solidified, and removed from a conventional molten metal sampler. In the conventional sample 4 shown in FIG. 6, a flash 43 connected to the neck 42 protrudes beyond the peripheral surface of the cylindrical sample main body 41. Such a flash 43 is used for transferring and analyzing a sample by a pneumatic tube. It has disadvantages that hinder the sample from being gripped by the instrument.

Japanese Utility Model Publication No. 6-43678 discloses a probe for sampling a molten metal. The molten metal sampler incorporated in this probe has a partition made of an inorganic material between the sample chamber and the inflow chamber, and the sample chamber and the inflow chamber are communicated by a quartz tube penetrating the center of the partition wall. By setting the upper end of the sample to be higher than the lower part of the inlet of the inflow chamber, it is possible to prevent the formation of a flash projecting beyond the peripheral surface of the sample body. However, the molten metal sampler disclosed in this publication has disadvantages in that the material cost is relatively expensive and the number of manufacturing steps is large because the structure is complicated and the number of parts is large, for example, the inflow chamber is provided with a quartz tube.

[0004]

[Problem to be solved]

 An object of the present invention is to improve the disadvantages of the conventional molten metal sampler, and to provide a molten metal sampler comprising a sprue member having a flow path for molten metal and a metal sample case having a sample chamber. In addition, by making the shape and structure of the sprue member such that large burrs do not occur in the sample, it is possible to transfer the sample by a pneumatic tube without cutting off the burrs and obstruct the gripping of the sample in the analytical instrument. It is to eliminate it. Another object of the present invention is to minimize the number of parts of the molten metal sampler by manufacturing an integrated gate member with a relatively simple mold made of a split mold in the molten metal sampler. And to reduce manufacturing costs.

Another object of the present invention is to properly select the shape and structure of the sprue member so that when the sampler is immersed in the molten metal, the molten metal rapidly enters the sample chamber due to small flow resistance. Provided is a molten metal sampler which is capable of obtaining a homogeneous analysis sample with small burrs by flowing in without being solidified when excess molten metal in the inflow chamber is solidified when the molten metal is filled in and drawn out of the molten metal. That is. Other objects and advantages of the present invention will be clarified in the following description.

[0006]

[Means for Solving the Problems]

 The molten metal sampler of the present invention includes a metal sample case having a cylindrical sample chamber and a sprue member made of a refractory material, and the outer shapes of the sample case and the sprue member are cylindrical with substantially the same diameter. The lower surface of the gate member is engaged with the upper surface of the sample case so as to close the upper portion of the sample chamber. The sprue member has a substantially funnel-shaped inflow chamber and a substantially cylindrical flow path. The flow path extends in the axial direction of the sprue member and communicates with the sample chamber at one end and a small-diameter portion of the inflow chamber at the other end. The communicating, substantially funnel-shaped inflow chamber has a large-diameter portion near the outer peripheral surface of the sprue member and a small-diameter portion at the center of the sprue member. The diameter A 1 of the large diameter portion of the inflow chamber is at least 1.25 times the diameter B of the small diameter portion.

[0007] The molten metal sampler of the present invention can have the following configuration. (1) Gate material The shell member is a shell molded product formed integrally. (2) The axis of the flow path and the axis of the inflow chamber intersect approximately vertically. (3) The diameter A of the large-diameter portion of the inflow chamber, the diameter B of the small-diameter portion of the inflow chamber, and the diameter C of the flow channel have a relationship of A> B> C. (4) The diameter A of the large diameter portion of the inflow chamber is 25 to 35 mm. (5) The diameter B of the small diameter portion of the inflow chamber is 16 to 20 mm. (6) The diameter C of the channel is 8 to 20 mm. (7) The sample chamber and the channel are formed coaxially.

[0008]

[Action]

 In the present invention, when the sampler is connected to the operation holder and immersed in the molten metal, the molten metal is guided to the funnel-shaped inner wall surface of the inflow chamber, and enters the sample chamber through the flow path. It flows in smoothly due to flow resistance and fills the sample chamber rapidly. A part of the air in the sample chamber is discharged from the flow path in place of the inflowing molten metal, and the remaining air in the sample chamber passes through a gap between the lower surface of the sprue member and the upper surface of the sample case or in the sprue member. Is discharged from the sample chamber through the micropores.

[0009] Immediately after the sample chamber is filled with molten metal, the sampler is withdrawn from the molten metal. When the large diameter portion of the inflow chamber is raised from the surface of the molten metal, the molten metal in the inflow chamber is guided by the funnel-shaped wall of the inflow chamber, and is smoothly discharged from the inflow chamber. The amount of the molten metal remaining in the inflow chamber by being combined with the solidified molten metal above the flow path is small. The molten metal filled in the sample chamber is deprived of heat by the sample case and solidified. The solidified sample in the sample collector is removed from the sample case after removing the sprue member and used as an analysis sample.

[0010]

[Embodiment of the invention]

 An embodiment of the present invention is shown in the drawings. FIG. 7 is a cross-sectional view in a plane passing through the longitudinal axis 15 of the sampler 1 incorporating the molten metal sampler of the embodiment of the present invention. The sample collection sampler 1 includes, from below (from the left end in FIG. 7), a temperature measuring element 14, a refractory mortar 9, a protective tube 6 composed of a tubular multi-wrapped paper tube, and a paper tube 7 fitted into and connected to the protective tube 6. An operation holder is attached to the other end of the paper tube 7. A fixed tube (paper tube) 8 that supports the temperature measuring element 14 and a molten metal sampler 10 composed of a sample case 11 and a sprue member 21 are arranged in the protective tube 6 from the bottom in order. The sample case 11 has a sample chamber 12 with an upper opening, and the sprue member 21 has an inflow chamber 5 and a flow path 54. Before the sampling of the molten metal, the inflow chamber 5 is closed by the sealing member 16 to prevent foreign matter from entering the sampler 10.

FIG. 1 is a sectional view of a molten metal sampler 10 according to an embodiment of the present invention in a plane passing through a longitudinal axis 15. FIG. 2 is a left side view of the sampler 10 of the embodiment of FIG. FIG. 3 is a perspective view of the sprue member 21 used in the sampler of the embodiment of FIG. The molten metal sampler 10 comprises a metal sample case 11 having a cylindrical sample chamber 12 and a refractory material, preferably a shell molded product (a mixture of silica sand and resin powder solidified on a mold). ), The outer shape of the sample case 11 and the outer shape of the sprue member 21 are cylindrical with substantially the same diameter D. The ratio H / M of the thickness dimension H to the diameter dimension M of the cylindrical sample chamber 12 is 0.2 to 3.0.

The gate member 21 is preferably made of an integral shell mold, and includes a substantially funnel-shaped inflow chamber 5 and a substantially cylindrical flow path 54. The flow path 54 extends in the direction along the axis 15 of the gate member 21, and communicates at one end with the sample chamber 12 and at the other end with the small-diameter portion 52 of the inflow chamber 5. The substantially funnel-shaped inflow chamber 5 has a large-diameter portion 51 near the outer peripheral surface of the gate member 21 and a small-diameter portion 52 at the center of the gate member 21. The diameter A of the large diameter portion 51 of the inflow chamber 5 is at least 1.25 times the diameter B of the small diameter portion 52. The axis 15 of the flow path 54 and the axis 55 of the inflow chamber 5 intersect substantially vertically.

The diameter A of the large-diameter portion 51 of the inflow chamber 5, the diameter B of the small-diameter portion 52 of the inflow chamber, and the diameter C of the flow path 54 have a relationship of A> B> C. The diameter A of the large diameter portion 51 of the inflow chamber is 25 to 35 mm, the diameter B of the small diameter portion 52 of the inflow chamber 5 is 16 to 20 mm, and the diameter C of the flow path 54 is 8 to 20 mm. The diameter D of the outer surface of the gate member 21 or the sample case 11 is 40 to 50 mm, and the height E of the gate member 21 is 40 to 70 mm. The ratio H / M of the height H to the inner diameter M of the sample chamber 12 is 0.2 to 3.0. The sprue member 21 is formed by filling and hardening the shell mold material into a mold including two split molds having a semi-cylindrical surface and a split mold corresponding to the bottom surface of the sprue member, and then disassembling and removing the split mold. . The inflow chamber 5 formed in one of the two split molds having a semi-cylindrical surface and a protruding portion corresponding to a connection portion between the inflow chamber and the flow path 54 are formed by moving the split mold along the axis of the inflow chamber from the gate member. It can be removed by separating it. The cylindrical projection corresponding to the flow path 54 formed in the split mold corresponding to the bottom surface can be removed by separating the split mold from the gate member along the axis of the flow path. The lower surface 24 of the sprue member 21 is engaged with the upper surface of the sample case 11, and a small gap is formed between the two, through which a small amount of air passes but viscous molten metal does not pass.

FIG. 4 shows that the sampler 10 of FIGS. 1 to 3 is filled with molten metal, excess molten metal flows out of the inflow chamber 5, and the molten metal in the sample chamber and the flow path 54 is solidified. FIG. 5 is a cross-sectional view similar to FIG. 1 showing a state of a sample 4, and FIG. 5 is a perspective view showing a sample collected by the sample collector of FIGS. is there. As shown in FIG. 4, the molten metal in the inflow chamber 5 is guided by the wall surface expanding outward of the inflow chamber 5 when the inflow chamber is filled with the molten metal and then pulled up from the molten metal. Due to the low flow resistance, the molten metal flows out of the inflow chamber 5 without being solidified in a short period of time. The amount is small. When the molten metal is filled into the sample chamber 12 through the flow path 54, the air in the sample chamber 12 is discharged through the flow path 54 or between the lower surface 24 of the gate member 21 and the upper surface of the sample case 11. The sample is discharged from the sample chamber 12 through the gap or the small hole in the gate member.

FIG. 5 shows the sample 4 from FIG. 4 in which the molten metal has been solidified, taken out of the sample collector 10. The size of the flash 43 attached to the neck 42 of the sample is extremely small, and 41 does not protrude beyond the outer peripheral surface. The sample 4 in FIG. 5 can be transported using a pneumatic tube without cutting the flash 43, and the flash does not hinder the gripping of the sample in the analytical instrument. Therefore, a sample for the analysis of a molten metal can be made quickly and at low cost.

[0016]

[Effect of the invention]

 In the molten metal sampler of the present invention, when the molten metal sampler is connected to the operation holder and immersed in the molten metal, the sealing member 16 is burned out, and the molten metal is formed in a funnel shape in the inflow chamber. And smoothly flows into the sample chamber 12 through the flow path 54 into the sample chamber 12 with a small flow resistance, thereby rapidly filling the sample chamber. The air in the sample chamber is discharged through a flow path, a gap between the sample case and the gate member, or a smiling hole in the gate member. Immediately after the sample chamber is filled with molten metal, the sampler is pulled out of the molten metal. When the large diameter part of the inflow chamber is raised from the surface of the molten metal, the molten metal in the inflow chamber is guided in a funnel shape, smoothly discharged from the inflow chamber, and combined with the molten metal that has begun to solidify above the flow path and flows in. The amount of molten metal remaining in the chamber and forming a flash becomes smaller, and the size of the flash attached to the neck of the sample becomes smaller.

The funnel-shaped inflow chamber in which the diameter A of the large-diameter portion is at least 1.25 times the diameter B of the small-diameter portion facilitates the inflow of the molten metal and the outflow of the excess molten metal, and at the same time, allows the A mold for a forming step can be formed only by a split mold. The cylindrical flow path, which extends almost coaxially with the gate member, allows the molten metal to flow uniformly into the sample chamber from the center in all directions to make the sample uniform and to form a flow path in the formation of the gate member. The corresponding mold should be simple. The mold for manufacturing the sprue member can have a relatively simple structure composed of a split mold, which is easy to remove, because the axis of the flow path and the axis of the inflow chamber intersect substantially vertically.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention in a plane passing through an axis.

FIG. 2 is an elevation view of the sampler seen from the left side of the embodiment of FIG. 1 of the present invention;

FIG. 3 is a perspective view of the sampler of the embodiment of FIG. 1 of the present invention;

FIG. 4 is a cross-sectional view similar to FIG. 1 showing a state in which a molten metal sample flows into the sampler of FIGS. 1 to 3, and after that, extra molten metal flows out of an inflow chamber 5 and the sample 4 is solidified.

FIG. 5 is a perspective view showing a sample collected and solidified by the sampler of FIGS. 1 to 4 taken out from the sampler;

FIG. 6 is a perspective view of a sample collected by a conventional sampler.

FIG. 7 is a cross-sectional view in a plane passing through a longitudinal axis of the molten metal sampler of the embodiment of the present invention connected to a holder.

[Explanation of symbols]

1: molten metal sampler connected to holder, 4: sample, 5: inflow chamber, 6: protective tube, 7: paper tube, 8: fixed tube,
9: refractory mortar, 10: molten metal sampler, 11:
Sample case, 12: sample chamber, 14: temperature measuring element, 1
6: Sealing member, 21: Gate member, 23: Upper surface, 24: Lower surface, 41: Sample body, 42: Neck, 43: Casting, 5
1: Large diameter part, 53: Communication part, 54: Channel.

Claims (5)

[Utility model registration claims] 1. A molten metal sampler, comprising: a metal sample case having a cylindrical sample chamber; and a sprue member made of a refractory material, wherein the outer shapes of the sample case and the sprue member are cylindrical with substantially the same diameter. Wherein the lower surface of the sprue member is engaged with the upper surface of the sample case so as to close the upper part of the sample chamber, and the sprue member includes a substantially funnel-shaped inflow chamber and a substantially cylindrical flow path. The gate member extends in the axial direction and communicates with the sample chamber at one end and communicates with the small-diameter portion of the inflow chamber at the other end. A molten metal sampler having a small diameter portion in the center of the gate member, wherein the diameter (A) of the large diameter portion of the inflow chamber is at least 1.25 times the diameter (B) of the small diameter portion. 2. The molten metal sampler according to claim 1, wherein said gate member is a shell molded product formed integrally. 3. The molten metal sampler according to claim 1, wherein the axis of the flow path and the axis of the inflow chamber intersect substantially vertically. 4. The diameter (A) of the large diameter portion of the inflow chamber, the diameter (B) of the small diameter portion of the inflow chamber, and the diameter (C) of the flow path are A
The molten metal sampler according to any one of claims 1 to 3, having a relationship of>B> C. 5. The diameter (A) of the large diameter portion of the inflow chamber is 25.
~ 35 mm, the diameter of the small diameter portion of the inflow chamber (B)
Is 16 to 20 mm, and the diameter (C) of the channel is
The molten metal sampler according to any one of claims 1 to 4, which is 8 to 20 mm.