Graphite cone brick device for semi-continuous casting of copper and copper alloy

Abstract

The invention provides a graphite cone brick device for copper and copper alloy semi-continuous casting, and relates to the technical field of copper and copper alloy casting. The lower part outside the small cone is a first cylinder, the upper part is a first inverted cone, and the outer diameter of the first cylinder is the same as that of the lower port of the first inverted cone; the side surface of the first inverted cone and the upper end surface of the first cylinder adopt an inclined L-shaped design; the whole interior of the small cone is of a first hollow structure, a fluid channel used for drainage of molten metal is formed, and the inner diameter of the first cylinder is larger than that of the first inverted cone; the outside of the large cone is cylindrical, the whole inside of the large cone is provided with a second hollow structure, and the shape of the second hollow structure is matched with that of the outside of the small cone; after the small cone is embedded into the large cone from top to bottom, the whole outer side face of the small cone is attached to the second hollow structure in the large cone, and a part of the first inverted cone on the upper portion of the small cone and a part of the first cylinder on the lower portion of the small cone are exposed out of the large cone.

Description

Technical Field

[0001] The invention relates to the technical field of copper and copper alloy casting, in particular to a graphite cone brick device for semi-continuous casting of copper and copper alloy. Background Art

[0002] Casting is one of the important links in the production process of copper and copper alloys. Traditional casting methods include mold casting, continuous casting, semi-continuous casting, etc. Semi-continuous casting refers to the vertical down-draw semi-continuous casting technology using a water-cooled crystallizer. It is an intermittent production, that is, one furnace of molten metal produces one ingot.

[0003] At present, the casting parts commonly used in the casting process mainly play the role of flow control, drainage and leakage prevention. The stopper rod, cone brick and pouring pipe are commonly known as the three essential parts for casting. The cone brick is the most critical one among them. It must be tightly connected with the crucible or furnace body outlet. If leakage occurs due to the gap in the interface, the casting will fail at the least, and the safety accidents of equipment and personnel will occur at the worst.

[0004] Graphite castings are the preferred casting material for copper and copper alloy castings due to their excellent properties such as easy processing, high temperature resistance, good thermal conductivity, and non-stickiness. However, the graphite cone bricks currently used have many problems such as short service life, high cost, copper liquid aspiration, complex replacement, and high labor intensity due to design defects.

[0005] like Figure 1 As shown, the casting system device is composed of an outer shell, an inner crucible, a graphite casting, etc. The steps of the prior art implementation process are as follows:

[0006] (1) The graphite cone brick is inserted from the bottom of the crucible, and the upper end of the cone brick is connected to the discharge port. It must be carefully checked to ensure that it fits tightly;

[0007] (2) Tighten the plug rod so that the conical end of the plug rod fits tightly against the drainage port on the cone brick, i.e., plug it tightly;

[0008] (3) Install the pouring pipe. The drainage port on the pouring pipe needs to be connected with the drainage port under the cone brick to form a connection;

[0009] Pour the molten metal into the crucible, quickly unscrew the stopper, and the metal liquid is drained from the cone brick and pouring pipe into the crystallizer to start casting.

[0010] from Figure 2 It can be seen that the existing graphite cone brick is an integrated structure, and has the following shortcomings during use:

[0011] (1) Short service life: one needs to be replaced per furnace, resulting in high cost and easy leakage of copper liquid;

[0012] (2) Cause copper liquid to absorb air: In order to avoid copper leakage, a large amount of refractory mud (such asFigure 3 as shown, but it is very easy to cause the copper liquid to absorb moisture and air, resulting in internal pores in the ingot and affecting the ingot quality;

[0013] (3) Inconvenient to replace: Each time, it can only be disassembled from the bottom of the crucible or the furnace body and then replaced. The installation process is complex, the replacement time is ≥2h, the efficiency is extremely low, and the production progress is seriously affected. SUMMARY OF THE INVENTION

[0014] The purpose of the present invention is to provide a graphite cone brick device for semi-continuous casting of copper and copper alloys in view of the above-mentioned existing technical defects. The device adopts a split structure to solve many problems such as short service life, high cost, causing copper liquid to absorb air, complex replacement, and high labor intensity in the original technical defects.

[0015] To this end, the present invention provides a graphite cone brick device for semi-continuous casting of copper and copper alloys. The device adopts a split structure and includes: a large cone and a small cone; wherein,

[0016] The lower part of the outer part of the small cone is a first cylinder, and the upper part is a first inverted cone. The outer diameter of the first cylinder is the same as the outer diameter of the lower port of the first inverted cone; the side surface of the first inverted cone adopts an oblique L-shaped design with the joint surface of the first inverted cone and the first cylinder; the entire interior of the small cone has a first hollow structure, and the first hollow structure forms a linear circular fluid channel for draining copper and copper alloy molten metal. The inner diameter of the first cylinder, which is a part of the circular fluid channel, is larger than the inner diameter of the first inverted cone, which is another part of the circular fluid channel;

[0017] The outer part of the large cone is cylindrical, and the entire interior has a second hollow structure, and the shape of the second hollow structure matches the shape of the outer part of the small cone;

[0018] When the small cone is embedded into the large cone from top to bottom, the entire outer side surface of the small cone fits with the second hollow structure inside the large cone, and a part of the first inverted cone at the upper part and a part of the first cylinder at the lower part of the small cone are exposed outside the large cone.

[0019] Furthermore, the first cylinder at the lower part and the first inverted cone at the upper part of the small cone are integrally processed during manufacturing.

[0020] Furthermore, the upper part of the first inverted cone of the small cone fits with the inner conical surface of the discharge port of the crucible.

[0021] Furthermore, the upper port of the first inverted cone of the small cone is a first concave surface, and the shape of the first concave surface matches the shape of the tapered end at the lower end of the stopper rod.

[0022] Furthermore, the inner part of the lower part of the first cylinder of the small cone has threads for connecting a graphite pouring pipe with external threads.

[0023] Further, the inner diameter of the first inverted conical body of the small cone is the same as the aperture of the hollow structure of the graphite pouring tube with a hollow structure.

[0024] Further, the lower port of the second cylinder is a second concave surface, and the shape of the second concave surface corresponds to the convex surface of the bottom support of the lower flange of the casting ladle housing.

[0025] The present invention also provides an installation method for the above-described device, including the following steps:

[0026] Step 1, insert the large cone into the lower end of the crucible, and the upper mouth of the large cone and the lower mouth of the crucible bottom are butt-jointed in a wrapped manner;

[0027] Step 2, dock the lower port of the second cylinder of the large cone with the lower flange of the casting ladle housing;

[0028] Step 3, insert the small cone into the large cone from the upper end of the crucible;

[0029] Step 4, dock the upper port of the first inverted conical body of the small cone with the lower tapered head of the stopper rod;

[0030] Step 5, dock the lower part of the first cylinder of the small cone with the end of the pouring tube.

[0031] The present invention also provides a copper and copper alloy casting method using the above-described device and the installation method of the above-described device, including:

[0032] Step S1, install the graphite cone brick device using the installation method described in claim 8;

[0033] Step S2, pour the molten copper and copper alloy metal liquid into the crucible, turn the stopper rod, and the copper and copper alloy metal liquid is drained from the cone brick and the pouring tube into the mold, and start casting.

[0034] Compared with the prior art, the advantages and positive effects of the present invention are:

[0035] (1) The service life of the graphite cone brick has been increased from one per furnace to 6 - 8 per furnace;

[0036] (2) The problems of copper leakage at the gap of the cone brick and moisture absorption of refractory mud have been completely solved, and the probability of internal pores in the ingot has been reduced to 0%;

[0037] (3) When replacing each time, there is no need to disassemble the flange at the bottom of the casting ladle. Only need to lift the small cone from the connection of the spinal canal under the flange, and only replace the small cone, which not only saves costs but also improves efficiency. The replacement time is only 20 minutes, and the labor intensity is greatly reduced. Description of the Drawings

[0038] To more clearly illustrate the technical solutions of the specific embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the specific embodiments. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For those skilled in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0039] Figure 1 is a casting system device of the prior art;

[0040] Figure 2 is a structural diagram of an integral graphite cone brick of the prior art;

[0041] Figure 3 is a morphological diagram of an integral graphite cone brick of the prior art;

[0042] Figure 4 is a schematic structural diagram of the split graphite cone brick of the present invention;

[0043] Figure 5 is a morphological diagram of the split graphite cone brick of the present invention;

[0044] Figure 6 is an assembly effect diagram of the split graphite cone brick of the present invention. Specific Embodiments

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0046] As Figure 4 shown, the graphite cone brick for semi-continuous casting of copper and copper alloys of the present invention has a split structure, that is, a combined structure of large and small cones. Among them,

[0047] the lower part of the outside of the small cone is in a cylindrical shape, and the upper part is in an inverted conical shape. The outer diameter of the cylinder is the same as the outer diameter of the lower port of the inverted cone; the ratio of the height of the inverted cone to the height of the cylinder is 2.4 - 2.5; the side surface of the inverted cone of the small cone and the joint surface of the inverted cone and the cylinder adopt an inclined L-shaped design (see Figure 4 icon ②); the whole inside of the small cone is hollow, so that a linear circular fluid channel is formed inside the small cone for the drainage of molten metal. The inner diameter of the hollow cylinder is larger than the inner diameter of the hollow inverted cone; the upper port of the inverted cone adopts a downward crescent concave surface design (see Figure 4The icon ③), with a radian of 20 - 22°, matches the shape of the conical end of the stopper rod. The purpose is to facilitate the exhaustion of the molten metal in the crucible as much as possible during the late stage of casting without residue. During manufacturing, the lower cylinder and the upper inverted cone need to be integrally processed and formed.

[0048] The outer part of the large cone is cylindrical and the inner part is hollow. The shape of the inner hollow part is the same as the outer shape of the small cone, that is, the lower part is cylindrical and the upper part is an inverted cone; the ratio of the height of the inner inverted cone to the height of the cylinder in the large cone is the same as the ratio of the height of the outer inverted cone to the height of the cylinder in the small cone. The height of the small cone is higher than that of the large cone; the joint surface between the inverted cone of the large cone and the inverted cone and the cylinder (see Figure 4 icon ①) also adopts an inclined L-shaped design; the lower port of the cylinder is designed with a concave surface, and its height is 5 mm. The purpose is to accurately dock with the convex surface of the bottom support of the flange at the lower end of the casting ladle shell (as Figure 5 shown) to avoid misalignment. The flange bottom support plays a role of supporting and lining.

[0049] The small cone is embedded into the large cone from top to bottom, showing an embedded structural form; the outer conical surface of the small cone is closely attached to the inner conical surface of the large cone, and the two inclined Ls are closely attached; the lower end of the large cone is supported by the casting ladle flange bottom support (at the feeding port); a part of the cylinder at the lower part of the small cone is exposed outside the large cone (see Figure 4 icon ⑥ and Figure 5 ). The internal part of the cylinder exposed outside the large cone adopts a thread design for connecting the graphite pouring tube (the end of the graphite pouring tube also adopts a thread design to match the internal thread of the part of the cylinder exposed outside the large cone). Moreover, the inside of the graphite pouring tube is also a hollow structure, and its aperture is the same as that of the hollow cone of the small cone to ensure smooth drainage of the molten metal without blockage.

[0050] A part of the upper inverted cone of the small cone is exposed outside the large cone. The exposed part of the inverted cone outside the large cone fits with the inner conical surface of the crucible discharge port. The upper port of the inverted cone of the small cone is docked with the conical head at the lower end of the stopper rod. The conical end of the stopper rod is closely attached to the upper port of the inverted cone of the small cone, that is, tightly plugged, to prevent the blockage of the runner caused by leakage.

[0051] Combined with Figure 1 , the graphite cone is used in combination with the crucible, the stopper rod, and the pouring tube. The upper port of the small cone is docked with the graphite stopper rod, and the lower port of the small cone is docked with the graphite pouring tube. The installation sequence of the overall combination is as follows: place the crucible → insert the large cone → fix the flange → insert the small cone → install the pouring tube (tighten by hand) → install the stopper rod → complete.

[0052] The large cone is inserted from the lower end of the crucible. The upper mouth of the large cone and the lower mouth of the crucible bottom adopt a wrapped docking method, that is, the crucible wraps the large cone.

[0053] The lower opening of the large cone is butt - jointed with the lower flange of the casting ladle shell, that is, the flange tightly supports the lower opening of the large cone;

[0054] The small cone is inserted from the upper end of the crucible. The part ② of the small cone and the part ① of the large cone are butt - jointed, and both adopt an L - type design to achieve a seamless connection;

[0055] The part ③ of the small cone is butt - jointed with the lower tapered head of the stopper rod. The tapered end of the stopper rod fits tightly with the drainage port ③ on the small cone, that is, it is tightly plugged, which plays a role in preventing the clogging of the runner caused by leakage;

[0056] The outer side ④ of the small cone not only fits tightly with the inner side ⑤ of the large cone, but also fits with the inner tapered surface of the discharge port of the crucible, and the three are airtight; The lower part ⑥ of the small cone adopts an internal thread design and can be tightened after being butt - jointed with the external thread at the end of the pouring tube.

[0057] Embodiment

[0058] As Figure 4 shown, a graphite cone brick device for vertical semi - continuous casting of copper and copper alloys according to the present invention is a split - type combined structure, including a large cone and a small cone. When in use, the implementation process steps are as follows:

[0059] (1) The large cone is inserted from the lower end of the crucible. The upper opening of the large cone and the lower opening of the crucible bottom are butt - jointed in a wrapping form, that is, the crucible wraps the large cone.

[0060] (2) The lower opening of the large cone is butt - jointed with the lower flange of the casting ladle shell, that is, the flange tightly holds the lower opening of the large cone.

[0061] (3) The small cone is inserted from the upper end of the crucible, and the part ② of the small cone and the part ① of the large cone are butt - jointed.

[0062] (4) The part ③ of the small cone is butt - jointed with the lower tapered head of the stopper rod. The tapered end of the stopper rod fits tightly with the drainage port ③ on the small cone, that is, it is tightly plugged.

[0063] (5) The outer side ④ of the small cone not only fits tightly with the inner side ⑤ of the large cone, but also fits with the inner tapered surface of the discharge port of the crucible, and the three are airtight ( Figure 6 ).

[0064] (6) The lower part ⑥ of the small cone adopts an internal thread design and can be tightened after being butt - jointed with the external thread at the end of the pouring tube, so that the drainage port on the pouring tube needs to be butt - jointed with the lower drainage port of the small cone to form a connection.

[0065] (7) Pour the melted metal liquid into the crucible, quickly unscrew the stopper rod, and the metal liquid is drained from the cone brick and the pouring tube into the mold to start casting.

[0066] Please note that the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification. The above embodiments only represent several implementation manners of the present application, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those skilled in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A graphite cone brick device for semi - continuous casting of copper and copper alloys, characterized in that, The device adopts a split structure, including: a large cone and a small cone; among them, The lower part of the outside of the small cone is a first cylinder, and the upper part is a first inverted cone. The outer diameter of the first cylinder is the same as the outer diameter of the lower port of the first inverted cone; the side surface of the first inverted cone adopts an oblique L-shaped design with the joint surface of the first inverted cone and the first cylinder; the whole inside of the small cone has a first hollow structure, and the first hollow structure forms a linear circular fluid channel for draining molten copper and copper alloy metal liquid. The inner diameter of the first cylinder, which is a part of the circular fluid channel, is larger than the inner diameter of the first inverted cone, which is another part of the circular fluid channel; The outside of the large cone is cylindrical, and the whole inside has a second hollow structure, and the shape of the second hollow structure matches the shape of the outside of the small cone; When the small cone is inserted into the large cone from top to bottom, the whole outer side surface of the small cone fits with the second hollow structure inside the large cone, and a part of the first inverted cone at the upper part and a part of the first cylinder at the lower part of the small cone are exposed outside the large cone.

2. The device according to claim 1, characterized in that, During manufacturing, the first cylinder at the lower part and the first inverted cone at the upper part of the small cone are integrally processed and formed.

3. The device according to claim 1, characterized in that, The upper part of the first inverted cone of the small cone fits with the inner conical surface of the discharge port of the crucible.

4. The device according to claim 1, characterized in that, The upper port of the first inverted cone of the small cone is a first concave surface, and the shape of the first concave surface matches the shape of the tapered end at the lower end of the stopper rod.

5. The device according to claim 1, characterized in that, The lower part inside the first cylinder of the small cone has threads for connecting a graphite pouring tube with external threads.

6. The device according to claim 5, characterized in that, The inner diameter of the first inverted cone of the small cone is the same as the aperture of the hollow structure of the graphite pouring tube with a hollow structure.

7. The device according to claim 1, characterized in that, The lower port of the second cylinder is a second concave surface, and the shape of the second concave surface corresponds to the convex surface of the bottom support of the flange at the lower end of the casting ladle shell.

8. The installation method of the device according to any one of claims 1-7, characterized in that, The method includes the following steps: Step 1, insert the large cone into the lower end of the crucible, and the upper mouth of the large cone and the lower mouth of the bottom of the crucible are butt-jointed in a wrapping manner; Step 2, dock the lower port of the second cylinder of the large cone with the flange at the lower end of the casting ladle shell; Step 3, insert the small cone into the large cone from the upper end of the crucible; Step 4, dock the upper port of the first inverted cone of the small cone with the tapered head at the lower end of the stopper rod; Step 5, dock the lower part of the first cylinder of the small cone with the end of the pouring tube.

9. A copper and copper alloy casting method, characterized in that, The method includes: Step S1, install the graphite cone brick device using the installation method as described in claim 8; Step S2, pour the melted copper and copper alloy metal liquid into the crucible, turn the stopper rod, and the copper and copper alloy metal liquid is drained from the cone brick and the pouring tube into the mold to start casting.

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