Horizontal continuous casting bar anti-cracking device
By designing a heating device for gradient cooling and secondary insulation during horizontal continuous casting, the problem of cracks in the cold partition area of high-temperature alloy rods is solved, and the quality of rods and finished product yield is significantly improved.
Patent Information
- Application Number
- CN202420851690.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-23
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-04-23
AI Technical Summary
During horizontal continuous casting, due to high-temperature strength and low plasticity, high-temperature alloy rods are prone to cracks in the cold partition area under the action of solidification thermal stress, resulting in cracks on the surface of continuous cast rods and material breakage, which seriously affects the quality of the finished product.
A crack-proof device including a horizontal continuous casting crystallizer, a heating device and a rolling machine is designed. The heating device consists of an inner and outer shell, and the outer wall of the inner shell is equipped with a resistive wire. The density of the resistive wire gradually decreases from the direction of the feed port, and refractory material is filled in the void to form a gradient cooling effect, and secondary insulation is performed to slow down the cooling of the rod.
Through gradient cooling and secondary insulation of the heating device, the cooling of the rod is effectively slowed down, and the temperature gradient and solidification thermal stress on the surface after the casting crystallizer are reduced, thereby eliminating rod cracks and improving the quality of the finished product.
Smart Images
Figure CN222429207U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of horizontal continuous casting manufacturing, in particular to a horizontal continuous casting bar material crack prevention device. Background Art
[0002] Horizontal continuous casting refers to a type of continuous steel casting in which molten steel is injected into a horizontally placed crystallizer from a horizontal direction, and the solidification process of the billet and the movement in the casting machine until it reaches the cooling bed are all in a horizontal state. Horizontal continuous casting has the following advantages: Since the horizontal continuous casting crystallizer is arranged horizontally, the static pressure of the molten steel in the crystallizer is low, which avoids the bulging of the billet; the sealed connection between the intermediate tank and the crystallizer of the horizontal continuous casting can effectively prevent the secondary oxidation of the steel flow; the billet has high cleanliness and its inclusion content is generally only 1 / 8 ~ 1 / 16 of that of the curved billet, so the billet quality is good, which is conducive to casting steel grades such as alloy steel containing easily oxidizable elements and small-section high-quality steel billets; horizontal continuous casting does not require straightening, so it can cast special crack-sensitive steel grades that cannot be cast by the curved continuous casting machine.
[0003] However, when horizontal continuous casting is used to prepare some bars, especially φ50 high-temperature alloys with high Al and Ti contents, due to their high high-temperature strength and poor plasticity, cracks are easily generated in the weak bonding area of the continuous casting billet, i.e., the cold shut area, under the action of solidification thermal stress, resulting in surface cracking of the continuous casting bar. Obvious cracks are easily generated in the cold shut and core of the continuous casting billet, which may even cause material breakage during the continuous casting process, seriously affecting the quality of the finished product. Utility Model Content
[0004] Purpose of the utility model: In view of the problems existing in the prior art, the utility model provides a horizontal continuous casting bar anti-crack device, which can effectively eliminate the thermal stress existing on the bar, thereby achieving the purpose of eliminating bar cracks and improving the quality of finished products.
[0005] Technical solution: The utility model provides a horizontal continuous casting bar anti-cracking device, including a horizontal continuous casting crystallizer, a heating device and a billet thrower, the feed port of the heating device is connected to the discharge port of the horizontal continuous casting crystallizer, and the billet thrower is arranged at the discharge port of the heating device; the heating device includes an inner shell and an outer shell sleeved outside the inner shell; a certain gap is provided between the inner shell and the outer shell; a resistance wire is arranged on the outer wall of the inner shell; the density of the resistance wire gradually decreases from the feed port direction of the heating device to the discharge port direction of the heating device.
[0006] Furthermore, the gap is filled with refractory material.
[0007] Furthermore, the feed inlet of the heating device is matched with the discharge outlet of the horizontal continuous casting crystallizer.
[0008] Furthermore, the feed inlet of the heating device is aligned with the center of the discharge outlet of the horizontal continuous casting crystallizer.
[0009] Preferably, the length of the heating device is not less than 1.5 meters. The length of the heating device cannot be too short; if the length is too short, the time that the rod stays in the heating device is not enough, and the effect of eliminating stress cannot be achieved; a heating device is provided to perform secondary heat preservation on the rod, so that the temperature drop on the surface of the rod is reduced from 100-150℃ / m before taking heat preservation measures to about 50-70℃ / m, and the temperature gradient on the surface of the billet after it leaves the crystallizer is reduced. The crack tendency of the cold shut part on the surface of the rod is significantly reduced, thereby avoiding the cracking phenomenon of the billet at the cold shut part, and improving the quality of the rod and the billet yield rate.
[0010] Beneficial effects: Compared with the prior art, the utility model adds a heating device between the horizontal continuous casting crystallizer and the billet drawing machine, and sets the density of the resistance wire in the heating device, so as to effectively slow down the cooling of the bar material and form gradient cooling, perform secondary heat preservation on the bar material, and reduce the temperature drop on the surface of the bar material to about 50-70℃ / m, thereby reducing the temperature gradient on the surface of the billet after it leaves the crystallizer and reducing the solidification thermal stress, thereby achieving the effect of eliminating bar cracks and improving the quality of the finished product. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 This is a schematic structural diagram of a horizontal continuous casting bar material crack prevention device of the utility model;
[0012] Figure 2 It is a structural schematic diagram of a heating device in a horizontal continuous casting bar material crack prevention device of the utility model;
[0013] Illustrations: 1- horizontal continuous casting crystallizer; 2- heating device; 3- casting machine; 201- inner shell; 202- outer shell; 203- resistance wire; 204- gap. DETAILED DESCRIPTION
[0014] The utility model is described in detail below in conjunction with the accompanying drawings.
[0015] Implementation 1:
[0016] This embodiment provides a horizontal continuous casting bar material crack prevention device, such as Figure 1-2As shown: it includes a horizontal continuous casting crystallizer 1, a heating device 2 and a billet thrower 3 which are arranged in sequence; the discharge port of the horizontal continuous casting crystallizer 1 is connected to the feed port of the heating device 2, and the billet thrower 3 is arranged at the discharge port of the heating device 2; the heating device 2 is a double-layer casing (i.e. an inner shell 201 and an outer shell 202 which is sleeved outside the inner shell 201); a certain gap 204 is provided between the inner shell 201 and the outer shell 202; a resistance wire 203 is arranged in the gap 204, and the resistance wire 203 is wound on the outer wall of the inner shell 201; from the feed port direction of the heating device 2 to the discharge port direction of the heating device 2, the resistance wire 203 is densely distributed in the front and sparsely distributed in the back; the gap 204 is also filled with refractory material; the feed port of the heating device 2 is aligned with the center of the discharge port of the horizontal continuous casting crystallizer 1.
[0017] Optionally, the inner shell 201 is made of refractory material, and the outer shell 202 is made of heat-insulating material.
[0018] Optionally, the inner wall diameter of the inner shell 201 is 53 mm;
[0019] Optionally, the resistance wire 203 is a 45kw (220V) resistance wire;
[0020] Optionally, the length of the heating device 2 is 1.5 meters.
[0021] This embodiment also provides the working principle and operation steps of the above-mentioned horizontal continuous casting bar material crack prevention device, which are as follows:
[0022] Connect the power supply and preheat the heating device 2 for 30 minutes;
[0023] After the dummy rod is inserted, the bar is pulled from the discharge port of the horizontal continuous casting crystallizer 1 through the feed port of the heating device 2 into the heating device 2 through the dummy rod; the resistance wire 203 in the heating device 2 is densely distributed at the front and sparsely distributed at the back to slow down the cooling of the bar and perform gradient cooling;
[0024] Set the drawing machine speed to maintain a drawing speed of 0.8-1.2 m / min; use a handheld temperature gun to measure the surface temperature of the bar at the outlet of the heating device, and keep the bar temperature at 110-150°C; the bar temperature should not be higher than 170°C. If it is too high, reduce the drawing machine 3 speed. Eliminate bar cracks.
[0025] The above implementation is only to illustrate the technical concept and features of the utility model, and its purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly, and it cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.
Claims
1. A horizontal continuous casting bar anti-crack device, characterized in that: It comprises a horizontal continuous casting crystallizer (1), a heating device (2) and a casting machine (3), wherein the feed port of the heating device (2) is connected to the discharge port of the horizontal continuous casting crystallizer (1), and the casting machine (3) is arranged at the discharge port of the heating device (2); the heating device (2) comprises an inner shell (201) and an outer shell (202) sleeved outside the inner shell (201); a certain gap (204) is provided between the inner shell (201) and the outer shell (202); a resistance wire (203) is arranged on the outer wall of the inner shell (201); and the density of the resistance wire (203) gradually decreases from the feed port direction of the heating device (2) to the discharge port direction of the heating device (2).
2. The horizontal continuous casting bar crack prevention device according to claim 1, characterized in that: The void (204) is filled with refractory material.
3. The horizontal continuous casting bar crack prevention device according to claim 1, characterized in that: The feed inlet of the heating device (2) is matched with the discharge outlet of the horizontal continuous casting crystallizer (1).
4. The horizontal continuous casting bar crack prevention device according to claim 3, characterized in that: The feed inlet of the heating device (2) is aligned with the center of the discharge outlet of the horizontal continuous casting crystallizer (1).
5. The horizontal continuous casting bar crack prevention device according to claim 1, characterized in that: The length of the heating device (2) is not less than 1.5 meters.