CN201150980Y - Composite crystallizer device for continuous casting of titanium-nickel alloy - Google Patents

Abstract

The utility model relates to a composite crystallizer for continuously casting titanium nickel alloy, belonging to the technical field of metallurgy metal continuous casing devices. The composite crystallizer of the utility model comprises a cooling water jacket, a water cooling copper wall, a graphite crystallizer casing, a sealing ring, a sealing ring gland, a cooling water inlet and an outlet, a crystallizer fire-resistant lining, a water-proof baffle, a casting blank and a crucible of alloy melt and melting alloy. The utility model is characterized by combining the cooling of the water cooling copper wall with the induction heating, and a stable temperature gradient filed is formed in the graphite crystallizer, a position which is most suitable for titanium nickel solid and liquid interface is determined in the crystallizer fire-resistant lining in order to be beneficial for the solidification formation of titanium nickel alloy. The crystallizer fire-resistant lining adopted in the utility model can not react with the titanium nickel alloy, thereby not being contaminated in order to guarantee the quality of the casting blank.

Description

Composite Mold Device for Continuous Casting of Titanium-Nickel Alloy

technical field

The utility model relates to a compound crystallizer device for continuous casting of titanium-nickel alloy, which belongs to the technical field of metallurgical metal continuous casting equipment.

Background technique

Titanium-nickel alloys are more and more widely used in various fields because of their excellent properties, such as excellent shape memory and superelasticity, relatively good mechanical properties, good corrosion resistance and biocompatibility. Due to the active chemical properties of titanium-nickel alloys and the reaction with most refractory materials at high temperatures, it is difficult to melt and form. At present, most of the titanium-nickel alloys produced at home and abroad adopt die-casting-peeling-rolling. The ingot after die-casting must remove its riser and defective parts on the surface, so the metal loss is large, and the processing is cumbersome, which greatly increases the cost of titanium-nickel alloys. Continuous casting instead of die-casting is the current research on titanium-nickel alloys. a key point.

Continuous casting is the use of solidification control technology to condense the liquid metal in the mold into a specific shape. The metal near the surface of the mold solidifies first, and the middle is still in a liquid state. The casting is separated from the mold while solidifying by the action of the traction device. Continuous casting technology is mainly composed of two parts, melting and forming. The smelting of titanium-nickel alloys mostly uses electromagnetic induction at this stage, using water-cooled copper crucibles or special refractory crucibles. The forming process of continuous casting is mainly completed in the crystallizer.

The crystallizer is the core component of the continuous casting system, and its function is to form a continuous casting billet shell with a certain shape and certain strength. As a continuous casting mold of titanium-nickel alloy, due to the characteristics of titanium-nickel alloy, the following requirements must be met: (1) It does not react with titanium-nickel alloy at high temperature. (2) Maintain a vacuum or protective gas atmosphere during continuous casting (3) Ensure a certain cooling rate and keep the solidification zone at a stable position. Most of the molds currently used in other alloy continuous casting are metal copper water-cooled molds. When working, the metal liquid directly contacts the copper wall of the mold. The cooling speed is extremely fast and the production efficiency is high. However, due to the rapid heat conduction, the surface is very easy to Defects such as cracks will affect the quality of continuous casting slabs.

Contents of the invention

The purpose of this utility model is to propose a compound crystallizer device for continuous casting of titanium-nickel alloy, so that it can meet the needs of continuous casting of titanium-nickel alloy under the condition of induction heating, can provide a stable temperature gradient field, and determine the solid-liquid interface s position.

The utility model relates to a composite crystallizer device for titanium-nickel alloy continuous casting, comprising: a cooling water jacket, a water-cooled copper wall, a graphite crystallizer jacket, a sealing ring, a sealing ring gland, cooling water inlet and outlet, and a refractory inner lining of the crystallizer , a water-proof baffle, a heating induction coil, a casting slab, an alloy melt and a crucible for melting an alloy; it is characterized in that: the crystallizer is composed of a graphite crystallizer coat and a mold refractory inner lining; The inner peripheral wall of the cooling water jacket is equipped with a water-cooled copper wall; the water-cooled copper wall is tightly connected with the graphite mold jacket; the mold refractory lining is located on the upper part of the graphite crystallizer jacket, and is close to the heating induction coil. The induction heating zone of the graphite crystallizer forms a stable hot end; the lower part of the graphite crystallization jacket is closely connected with the inner water-cooled copper wall of the cooling water jacket, forming a cold end at the lower part of the graphite crystallizer jacket; making the entire graphite crystallizer space A stable temperature gradient field is formed; the alloy melt is placed in a crucible for melting the alloy, and a heating induction coil is arranged around the crucible; the lower end of the copper wall part of the lower part of the crystallizer is opened with a notch and a Wilson sealing ring is placed, and Compress the sealing ring gland of the sealing ring; in this way, a dynamic sealing system is formed when the dummy rod pulls the slab; the bottom of the cooling water jacket is provided with a cooling water inlet and outlet; in the annular space of the cooling water jacket, longitudinally symmetrical The half-height water-repelling baffle and the upper parts of the left and right halves of the cooling water jacket communicate with each other. The cooling water is circulated and cooled through the cooling water inlet and outlet.

The crystallizer refractory lining in the graphite crystallizer jacket is made of special refractory materials that do not react with titanium-nickel alloys, that is, special ceramics with CeS, Y ₂ O ₃ , CaO or BN as main components.

Features and advantages of the present utility model are as follows:

The composite crystallizer device for titanium-nickel alloy continuous casting of the utility model meets the needs of titanium-nickel alloy continuous casting, and can provide a stable temperature gradient field; and can be adjusted by adjusting the position and length of the graphite crystallizer coat and the refractory lining of the crystallizer. Ensure the proper position of the titanium-nickel alloy solid-liquid interface in the refractory lining. In addition, the refractory inner lining of the composite crystallizer device of the present invention will not react with the titanium-nickel alloy, which can ensure the quality of the alloy. The composite device can also provide a temperature gradient with a gentle cooling rate, which is beneficial to the solidification and forming of the titanium-nickel alloy.

Description of drawings

Fig. 1 is a structural schematic diagram of the composite crystallizer device of the present invention.

Fig. 2 is a sectional top view along line A-A of Fig. 1 .

Detailed ways

Now the specific embodiment of the present utility model is described in the following.

Example 1

Referring to Figure 1 and Figure 2, the compound crystallizer device for titanium-nickel alloy continuous casting includes: cooling water jacket (1), water-cooled copper wall (2), graphite crystallizer jacket (3), sealing ring (4), sealing Ring gland (5), cooling water inlet and outlet (6), crystallizer refractory lining (7), water barrier (8), heating induction coil (9), billet (10), alloy melt (11 ) and a crucible (12) for melting alloy; it is characterized in that: the crystallizer is made up of a graphite crystallizer coat (3) and a crystallizer refractory inner lining (7); the outside of the crystallizer is provided with a cooling water jacket (1 ), the inner peripheral wall of the cooling water jacket (1) is provided with a water-cooled copper wall (2); the water-cooled copper wall (2) is tightly connected with the graphite crystallizer jacket (3) into one; the crystallizer refractory lining (7) is located The upper part of the device jacket (3), and close to the induction heating zone below the heating induction coil (9), forms a stable hot end; the lower part of the graphite crystallization jacket (3) and the inner water-cooled copper of the cooling water jacket (1) The walls (2) are closely connected and contacted, forming a cold end at the lower part of the graphite crystallizer jacket (3); a stable temperature gradient field is formed in the entire graphite crystallizer space; the alloy melt (11) is placed in the molten alloy Inside the crucible (12), a heating induction coil (9) is arranged around the crucible (12); the lower end of the copper wall (2) part of the lower part of the crystallizer is opened with a notch and a Wilson sealing ring (4) is placed, and it is compressed The sealing ring gland (5) of the sealing ring; in this way, a dynamic sealing system is formed when the dummy bar pulls the slab; the bottom of the cooling water jacket (1) is provided with a cooling water inlet and outlet (6); In the annular space of (1), half-height water-repelling baffles (8) are longitudinally symmetrically arranged, and the upper parts of the left and right halves of the cooling water jacket (1) communicate with each other. The cooling water is circulated and cooled through the cooling water inlet and outlet (6).

The crystallizer refractory material in the graphite crystallizer jacket (3) is made of special ceramics with _{Y2O3 as} the main component.

In the present embodiment, the concrete size of adopting each part is as follows:

The outer diameter of the crystallizer cooling water jacket is 100mm, the height is 110mm, the inner diameter of the upper water-cooled copper wall in the crystallizer is 20mm; the length of the graphite crystallizer sleeve is 110mm, and the lower end 70mm is closely connected with the water-cooled copper wall; the length of the mold refractory lining 80mm, the lower end 60mm is closely connected with the graphite crystallizer sleeve, and the upper end is connected with the crucible.

The process parameters are as follows: in an argon protective atmosphere, the output power of the intermediate frequency induction heater is 8kw, the temperature of the titanium-nickel alloy melt is 1400°C, the position of the dummy rod is 40mm below the heating zone, and the pulling speed of the dummy rod is 8mm /min, the temperature of the cooling water is room temperature, and the diameter of the drawn titanium-nickel continuous casting billet is 10mm.

Claims (2)

1. A compound crystallizer device for continuous casting of titanium-nickel alloy, including: cooling water jacket (1), water-cooled copper wall (2), graphite crystallizer jacket (3), sealing ring (4), sealing ring gland (5), cooling water inlet and outlet (6), mold refractory lining (7), water baffle (8), heating induction coil (9), billet (10), alloy melt (11) and melting The crucible (12) of alloy; It is characterized in that: crystallizer is made up of graphite crystallizer coat (3) and crystallizer refractory inner lining (7); The inner peripheral wall of the water jacket (1) is provided with a water-cooled copper wall (2); the water-cooled copper wall (2) is tightly connected with the graphite crystallizer jacket (3); the crystallizer refractory lining (7) is located on the graphite crystallizer jacket ( 3), and close to the induction heating zone below the heating induction coil (9), forming a stable hot end; graphite crystallizes the lower part of its jacket (3) and the inner water-cooled copper wall (2) of the cooling water jacket (1) ) are tightly connected and contacted, forming a cold end at the bottom of the graphite crystallizer overcoat (3); a stable temperature gradient field is formed in the entire graphite crystallizer space; the alloy melt (11) is placed in a crucible (12) for melting the alloy ), a heating induction coil (9) is arranged around the crucible (12); the lower end of the copper wall (2) part of the lower part of the crystallizer has a notch and a Wilson sealing ring (4) is placed, and the sealing ring is pressed The sealing ring gland (5); in this way, a dynamic sealing system is formed when the dummy bar pulls the slab; the bottom of the cooling water jacket (1) is provided with a cooling water inlet and outlet (6); the cooling water jacket (1) In the annular space, half-height water barriers (8) are longitudinally symmetrically arranged, and the upper parts of the left and right halves of the cooling water jacket (1) communicate with each other, so that the cooling water is circulated and cooled through the cooling water inlet and outlet (6). 2, a kind of titanium-nickel alloy continuous casting compound crystallizer device as shown in claim 1, it is characterized in that the crystallizer refractory lining (7) in the described graphite crystallizer overcoat (3) is made of non-titanium-nickel A special refractory material for alloy reaction, that is, a special ceramic made of CeS, Y ₂ O ₃ , CaO or BN as the main component.

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