CN218395857U

CN218395857U - Core crystallizer

Info

Publication number: CN218395857U
Application number: CN202222433075.1U
Authority: CN
Inventors: 余强; 易刚; 叶欢欢
Original assignee: Zhongshan Laitong Metal Technology Co ltd
Current assignee: Zhongshan Laitong Metal Technology Co ltd
Priority date: 2022-09-13
Filing date: 2022-09-13
Publication date: 2023-01-31
Anticipated expiration: 2032-09-13

Abstract

The utility model discloses a core crystallizer, including crystallization mould, core cooler. The output end of the crystallization mould extends out of the bottom of the molten metal pool. The core cooler is arranged in the center of the inner cavity of the crystallization mold, and a space is reserved between the core cooler and the inner wall of the crystallization mold; the depth of the core cooler extending into the inner cavity of the crystallization mold is higher than that of the molten metal crystallization area. The part of the crystallization mould extending out of the molten metal bath is sleeved with an outer wall crystallizer. The molten metal flows into the crystallization mold from the liquid inlet hole, firstly, the inner periphery molten metal positioned at the core part of the crystallization mold is cooled under the action of the core part cooler, and the periphery molten metal close to the inner wall of the crystallization mold is not subjected to the action of the core part cooler, so that the inner periphery molten metal is cooled more quickly; when the peripheral molten metal flows to the height of the outer wall crystallizer, the peripheral molten metal is cooled more quickly, so that the cooling speed of the peripheral molten metal and the cooling speed of the inner peripheral molten metal tend to be consistent, the depth of liquid cavities is reduced, and the quality of products is improved.

Description

Core crystallizer

Technical Field

The utility model relates to a casting technology field is drawn down, in particular to core crystallizer.

Background

Continuous casting machines are used in a wide variety of casting applications with outstanding performance. The continuous casting includes 3 types of horizontal continuous casting, up-drawing continuous casting and down-drawing continuous casting. The continuous casting machine cast by the down-drawing method is suitable for processing metal materials with good fluidity, such as alloy, silver, 925 silver, copper, brass, gold-silver alloy, gold-copper alloy and the like, and the production of copper pipes is generally cast by the down-drawing method, so that the cost can be saved, the quality of cast products can be improved, and higher cost benefit can be obtained.

The casting by the down-drawing method is a process of smelting in a closed vacuum smelting furnace, continuously pouring molten metal into a crystallizer for cooling, and continuously drawing out a solidified metal section along with a drawing rod. At present, cooling in the casting process of the down-drawing method is performed through a crystallizer at the periphery of a graphite mold, as shown in fig. 1, the drawing method is a schematic diagram of a casting device of the down-drawing method in the prior art, and the drawing method comprises a molten pool filled with molten metal, a crystallization mold communicated below the molten pool, and a crystallizer sleeved on the outer wall of the crystallization mold, wherein a cooling water channel is arranged around an inner cavity of the crystallizer, a cooling water inlet and a cooling water outlet which are communicated with the cooling water channel are arranged on the crystallizer, the molten metal in the molten pool flows into the crystallization mold, the molten metal in the crystallization mold is solidified and formed through cooling of the crystallizer, and then the molten metal is pulled out from the bottom of the crystallization mold.

The cooling effect of the core part of the cast ingot is poor, the temperature of the core part is reduced more slowly when the cast ingot is larger and the pulling speed is higher, the temperature gradient of the section of the cast ingot is larger, the liquid cavity is deeper, and the feeding is more difficult. During solidification, insufficient metal liquid is supplemented to generate solidification and pulling cracks, which are commonly called as thermal cracks, liquid cavities are too deep, and serious looseness and air holes can be generated. Therefore, how to submit the cooling rate of the core is the technical problem to be solved by the utility model.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at providing a core crystallizer aims at realizing the cooling of ingot casting core at the in-process of drawing the method casting down, and the effect is excellent.

The utility model provides a core crystallizer includes:

one end of the crystallization mould is an input end and extends upwards into the molten metal pool, the other end of the crystallization mould is an output end and extends out of the bottom of the molten metal pool, and the input end is higher than the molten metal level in the molten metal pool;

the core cooler is axially installed in the center of the inner cavity of the crystallization mold from the input end of the crystallization mold, which is higher than the level of molten metal, and a space for the molten metal to flow is reserved between the core cooler and the inner wall of the crystallization mold; the core cooler extends into the inner cavity of the crystallization mold to a depth higher than that of a molten metal crystallization area;

and the liquid inlet hole is formed in the side wall of the part, immersed in the molten metal, of the crystallization mold, and the molten metal in the molten metal pool flows into the inner cavity of the crystallization mold from the liquid inlet hole.

Preferably, the core cooler comprises a cooling core and a jacket wrapped around the cooling core; the one end of overcoat sets up the connector, connects to be fixed the input port of crystallization mould, be equipped with on the connector with the exhaust passage of the inner chamber intercommunication of crystallization mould, exhaust passage is located the top in feed liquor hole, and separate at a distance.

Preferably, a cooling water flow channel is arranged in the cooling core in the axial direction of the cooling core, one end of the cooling core extends out of the connector, and a cooling water inlet pipe and a cooling water outlet pipe which are communicated with the cooling water flow channel are arranged.

Preferably, the cooling water flow channel is U-shaped, one end of the cooling water flow channel is communicated with the cooling water inlet pipe, and the other end of the cooling water flow channel is communicated with the cooling water outlet pipe.

Preferably, the cooling core is a copper column, the jacket is a graphite sleeve, and the cooling core is in interference fit in the jacket.

Preferably, the crystallization mold is a graphite mold made of graphite.

Preferably, the part of the crystallization mold extending out of the molten metal bath is sleeved with an outer wall crystallizer, the depth of the core cooler extending into the inner cavity of the crystallization mold is higher than that of the outer wall crystallizer, an outer wall cooling water flow channel is arranged in the inner cavity of the outer wall crystallizer in a surrounding manner, and a cooling water inlet and a cooling water outlet which are communicated with the outer wall cooling water flow channel are respectively arranged on two opposite sides of the outer wall crystallizer.

Compared with the prior art, the beneficial effects of the utility model are that:

the molten metal in the molten metal pool flows into the inner cavity of the crystallization mold from the liquid inlet hole, firstly, the molten metal on the inner periphery of the core part of the crystallization mold is cooled under the action of the core part cooler, and the molten metal on the periphery close to the inner wall of the crystallization mold is not subjected to the action of the core part cooler, so that the molten metal on the inner periphery is cooled more quickly; when the peripheral molten metal flows to the height of the outer wall crystallizer, the peripheral molten metal is cooled quickly, the inner peripheral molten metal is cooled slowly, and the internal heat transfer direction of the molten metal is changed, so that the cooling speed of the peripheral molten metal and the cooling speed of the inner peripheral molten metal tend to be consistent, and the depth of liquid cavities is reduced; the internal heat transfer of the molten metal can also improve the drawing speed, and is beneficial to improving the quality and the production efficiency of products.

Drawings

Fig. 1 is a schematic view of a casting apparatus of a down-drawing method in the prior art.

FIG. 2 is a schematic view of the core crystallizer of the present invention during casting;

fig. 3 is a schematic structural view of the core crystallizer of the present invention.

The realization, the functional characteristics and the advantages of the utility model are further explained by combining the embodiment and referring to the attached drawings.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the foregoing drawings are used for distinguishing between different objects and not for describing a particular sequential order.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.

With reference to fig. 2 and 3, an embodiment of a core crystallizer of the present invention is provided:

a core crystallizer comprises a crystallization mold 1 and a core cooler 2, wherein one end of the crystallization mold 1 is an input end and extends upwards into a molten metal bath 3, the other end of the crystallization mold is an output end and extends out of the bottom of the molten metal bath 3, and the input end is higher than the molten metal level in the molten metal bath 3.

The core cooler 2 is axially arranged in the center of the inner cavity of the crystallization mould 1 from the input end of the crystallization mould 1, which is higher than the level of molten metal, and a space for the molten metal to flow is reserved between the core cooler 2 and the inner wall of the crystallization mould 1; the core cooler 2 extends into the cavity of the crystallization mold 1 to a depth higher than the liquid metal crystallization zone 12.

The inlet openings 11 are provided in the side walls of the part of the crystallization mould 1 that is immersed in the metal bath.

The part of the crystallization mould 1 extending out of the molten metal bath 3 is sleeved with an outer wall crystallizer 4, the depth of the core cooler 2 extending into the inner cavity of the crystallization mould 1 is higher than that of the outer wall crystallizer 4, an outer wall cooling water flow channel 41 is arranged around the inner cavity of the outer wall crystallizer 4, and a cooling water inlet and a cooling water outlet which are communicated with the outer wall cooling water flow channel 41 are respectively arranged on two opposite sides of the outer wall crystallizer 4. As shown in fig. 2, the outer wall cooling water flow passage 41 is provided in two sets, and the cooling water inlet and the cooling water outlet are provided in two sets. The cooling water is introduced into the outer wall cooling water flow passage 41 from the cooling water inlet and discharged from the cold water outlet, and the peripheral portion of the molten metal is cooled by the cooling water.

As shown in fig. 1, a casting apparatus of a down-draw method in the prior art includes a molten pool 3 into which molten metal is poured, a crystallization mold communicated with a lower portion of the molten pool, and a crystallizer 4 sleeved on an outer wall of the crystallization mold, wherein a cooling water channel is disposed around an inner cavity of the crystallizer 4, the crystallizer 4 is provided with a cooling water inlet and a cooling water outlet communicated with the cooling water channel, molten metal 13 in the molten pool flows into the crystallization mold, and the crystallizer 4 cools the molten metal near the periphery thereof, so that the molten metal 13 is crystallized after cooling. However, because no core cooling structure is arranged, the inner temperature of the molten metal at the core of the crystallization mold is higher than the outer temperature, so that obvious liquid pocket depth is formed, and the quality of a product is influenced.

In this embodiment, the molten metal 13 in the molten metal bath 3 flows into the cavity of the crystallization mold 1 through the liquid inlet hole 11, and the molten metal in the core of the crystallization mold 1 is cooled by the core cooler 2. The peripheral molten metal close to the inner wall of the crystallization mold 1 is not acted by the core cooler 2, and the temperature of the inner peripheral molten metal is reduced more quickly; when the molten metal flows to the height of the outer wall crystallizer 4, the peripheral molten metal is cooled quickly, the inner periphery molten metal is cooled slowly, and the heat transfer direction in the molten metal is changed, so that the cooling speed of the peripheral molten metal and the cooling speed of the inner periphery molten metal tend to be consistent, and the depth of liquid cavities is reduced. The internal heat transfer of the molten metal 13 can also improve the drawing speed, which is beneficial to improving the quality and the production efficiency of products.

As shown in fig. 3, the core cooler 2 includes a cooling core 21 and an outer jacket 22 wrapped around the cooling core 21; one end of the outer sleeve 22 is provided with a connector 221 which is connected and fixed to an input port of the crystallization mold 1. In order to facilitate the gas in the molten metal 13 to be discharged during the crystallization process, the connector 221 is provided with a gas discharge channel 222 communicated with the inner cavity of the crystallization mold 1, and the gas discharge channel 222 is located above the liquid inlet hole 11 and is separated by a distance so as to prevent the gas discharged from the molten metal 13 from being melted into the newly added molten metal 13 again. The liquid inlet hole 11 is arranged on the side wall of the crystallization mould 1, and the metal liquid 13 flows down along the side wall, so that the liquid inlet is stable, and more bubbles are prevented from being generated.

A cooling water flow channel 211 is arranged in the cooling core 21 along the axial direction, one end of the cooling core 21 extends out from the connector 221, and a cooling water inlet pipe and a cooling water outlet pipe which are communicated with the cooling water flow channel 211 are arranged. Specifically, the cooling water channel 211 is U-shaped, one end of which is communicated with the cooling water inlet pipe, and the other end of which is communicated with the cooling water outlet pipe, and the cooling water enters the cooling water channel 211 from the cooling water inlet pipe and is discharged from the cooling water outlet pipe, and the molten metal core is cooled by the cooling water. The cooling core 21 is a copper column, and the heat transfer efficiency is high. The outer sleeve 22 and the crystallization mould 1 are both made of graphite materials, so that the heat-resistant crystallization mould is high in heat transfer efficiency. The cooling core 21 is interference fitted within the jacket 22.

The above embodiments are only used to illustrate the technical solution of the present invention, and do not limit the protection scope of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step, are within the scope of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still make no creative work on the condition of conflict, and make mutual combination, addition and deletion, or other adjustments according to the features in the embodiments of the present invention, thereby obtaining other technical solutions which are different and do not depart from the concept of the present invention, and these technical solutions also belong to the scope to be protected by the present invention.

Claims

1. A core crystallizer, comprising:

2. The core crystallizer of claim 1, wherein the core cooler comprises a cooling core and an outer jacket wrapped around the cooling core; the one end of overcoat sets up the connector, connects to be fixed the input port of crystallization mould, be equipped with on the connector with the exhaust passage of the inner chamber intercommunication of crystallization mould, exhaust passage is located the top in feed liquor hole, and separate at intervals.

3. The core crystallizer according to claim 2, wherein a cooling water flow passage is provided in the cooling core in an axial direction thereof, one end of the cooling core extends from the connector, and a cooling water inlet pipe and a cooling water outlet pipe are provided in communication with the cooling water flow passage.

4. The core crystallizer of claim 3 wherein the cooling water flow channels are U-shaped with one end in communication with the cooling water inlet pipe and the other end in communication with the cooling water outlet pipe.

5. The core crystallizer of any of claims 2 to 4, wherein the cooling core is a copper cylinder and the jacket is a graphite jacket, the cooling core being interference fit within the jacket.

6. The core crystallizer as in claim 5, wherein the crystallization mold is a graphite mold made of graphite material.

7. The core crystallizer as claimed in any one of claims 1 to 4, wherein the part of the crystallization mold extending out of the molten metal bath is sleeved with an outer wall crystallizer, the core cooler extends into the inner cavity of the crystallization mold to a depth higher than that of the outer wall crystallizer, the inner cavity of the outer wall crystallizer is provided with an outer wall cooling water flow channel in a surrounding manner, and two opposite sides of the outer wall crystallizer are respectively provided with a cooling water inlet and a cooling water outlet communicated with the outer wall cooling water flow channel.