Groove-shaped pouring cup capable of automatically stopping slag and pouring control method thereof

Abstract

The invention belongs to the field of pouring cups, and particularly relates to a groove-shaped pouring cup capable of automatically stopping slag and a pouring control method thereof.The groove-shaped pouring cup comprises a steel groove body, a fire-resistant lining and lifting lugs, the two ends outside the steel groove body are each provided with one lifting lug, a water outlet is formed in the bottom of the steel groove body, a slag partition plate is arranged in the steel groove body and inserted into an open groove of the fire-resistant lining, and the slag partition plate is connected with the fire-resistant lining. The distance h between the bottom edge of the slag partition plate and the bottom of the refractory lining is 30-60mm; one side of the slag partition plate is a steel inlet area, and the other side of the slag partition plate is a steel outlet area; the water outlet is located in the fire-resistant step, the upper edge of the fire-resistant step is flush with the lower edge of the slag partition plate, and the distance between the fire-resistant step and the slag partition plate is 60-80 mm. The slag stopping device has the beneficial effects that a turning runner of molten iron from the slag separating plate to the water outlet is beneficial to upward floating of iron slag, the automatic slag stopping function can be achieved, more than 99% of floating slag is stopped, the slag inclusion defect of iron castings is remarkably reduced, and the qualified rate of finished products reaches 100%.

Description

Technical Field

[0001] The invention belongs to the field of pouring cups, and in particular relates to a trough-shaped pouring cup capable of automatically blocking slag and a pouring control method thereof. Background Art

[0002] Casting technology is one of the important methods for forming mechanical parts. Metal casting is to pour molten metal into a cavity with a certain shape to form a casting with the required shape and function. Some castings can be used directly, while others need further machining, heat treatment and other processes to obtain the required parts.

[0003] In the casting process, the molten metal needs to be poured through the pouring cup, sprue, and ingates to enter the mold cavity (see Figure 4 The pouring cup is one of the indispensable and important units of the pouring system. Generally, the pouring cup is used to collect the molten metal and accurately enter the mold cavity, and prevent the molten metal from splashing before entering the sprue. There are many kinds of pouring cups in daily production, including homemade trumpet-shaped ones, trumpet-shaped ones made by professional factories using refractory materials ( Figure 5 ) and common grooves made by foundries using various molding sands ( Figure 6 ) and so on. These types of pouring cups are widely used in ferrous metal casting.

[0004] Since cast iron has good fluidity after melting, it is not suitable for bottom leaking ladle pouring, so it can only be poured by flipping ladle (diagram Figure 7 ), so that the molten iron slag floating above the molten metal will flow out with the molten metal and enter the cavity through the pouring cup, causing defects such as slag inclusion in the casting. In order to reduce the occurrence of defects, a groove-type pouring cup is usually used, but in actual production, it can only reduce about 60%, and the effect is not obvious.

[0005] The Chinese utility model patent application number 202222679207.9 discloses a pouring cup with a built-in filter component. The pouring cup is a detachable structure, including a first cup body and a second cup body. After the first cup body and the second cup body are combined, a through-hole runner with upper and lower openings is formed between them. A filter component is installed inside the through-hole runner; the cross-section of the through-hole runner is a polygonal structure. The pouring cup of this application sets the through-hole runner as a polygonal structure, so that the molten metal will not rotate or flip in the runner during pouring, and the oxidation of the molten metal and the occurrence of air entrainment are avoided. The purpose is to reduce the inclusion rate of the casting through the filter component and improve the molding quality of the casting.

[0006] The Chinese utility model patent with application number 202223320709.9 discloses a plugging device and a pouring cup, including a plug for plugging a pouring hole, a driving mechanism for driving the plug, and a connecting rod connecting the plug and the driving mechanism, the driving mechanism including a fixed seat, a guide rod movably connected to the fixed seat, and a lever member driving the guide rod to move up and down, wherein the fixed seat is provided with a locking portion, and the guide rod is provided with a fastening portion that forms a locking fit with the locking portion to fix the guide rod. This solution has a simple structure, is easy to adjust, has high stability, and can also meet the needs of large-capacity pouring.

[0007] It can be seen from the above-mentioned prior art that minimizing the amount of molten iron slag entering castings is an unremitting pursuit in the industry. However, due to various constraints, the effect is not satisfactory and further research and development is necessary. Summary of the invention

[0008] The purpose of the present invention is to provide a trough-shaped pouring cup that can automatically block slag and a pouring control method thereof, so as to overcome the shortcomings of the prior art, adopt a trough-shaped pouring cup structure, utilize a plug-in slag separator and a refractory step at the water outlet to form a turning flow channel for molten iron, realize the automatic slag blocking function, and at the same time control the pouring speed of the pouring cup to improve the slag blocking effect, thereby reducing the slag inclusion defects of cast iron parts and improving the molding quality of castings.

[0009] To achieve the above object, the present invention is implemented through the following technical solutions:

[0010] One of the technical solutions: a trough-shaped pouring cup capable of automatically blocking slag, comprising a steel trough body, a refractory lining and a lifting lug, wherein a lifting lug is provided at each end of the outer side of the steel trough body, a refractory lining is provided in the steel trough body, a water outlet is provided at the bottom of the steel trough body, a slag separator is provided in the steel trough body, the slag separator is inserted in the slot of the refractory lining, the bottom edge of the slag separator is 30-60mm away from the bottom of the refractory lining h; one side of the slag separator is a steel inlet area, and the other side is a steel outlet area, and the water outlet is located at the bottom of the steel outlet area; the water outlet is located on a refractory step, the upper edge of the refractory step is flush with the lower edge of the slag separator, and a spacing m of 60-80mm is provided between the refractory step and the slag separator, and from the steel inlet area to the steel outlet area, the molten steel bypasses the bottom of the slag separator and the edge of the refractory step to form an S-shaped flow channel.

[0011] Furthermore, the outer dimensions of the steel tank body are (length × width × height) (500-800) mm × (300-500) mm × (300-500) mm, and length: width = 2:1.

[0012] Furthermore, the thickness of the refractory lining is 60-150 mm.

[0013] Furthermore, the refractory lining is a resin sand lining.

[0014] Furthermore, the length ratio of the steel entry zone to the steel exit zone is 1:1-2.

[0015] Furthermore, the slag separator is Al 2 O 3 It is made by ramming refractory aggregate and binder with a content of more than 60%.

[0016] Furthermore, the gap between the slag separator and the slot of the refractory lining is filled with casting coating paste.

[0017] Furthermore, the contact parts of the refractory lining and the slag separator with the liquid metal are coated with a zircon powder alcohol-based coating layer, and the coating layer thickness is 1-3 mm.

[0018] Technical solution 2: A pouring control method for a trough-shaped pouring cup that can automatically block slag. During the pouring process, molten steel is quickly poured into the steel inlet area. The metal liquid level in the steel inlet area of ​​the pouring cup quickly reaches above the observation line. The observation line is H1>3h away from the bottom of the refractory lining. Then the pouring speed is reduced to allow the metal liquid in the steel inlet area to gradually rise. When the distance from the upper edge of the refractory lining is 50-100mm, the pouring speed is maintained. When the metal liquid in the riser of the casting is about to be filled, the pouring is stopped immediately.

[0019] Furthermore, the rapid pouring causes the liquid level in the pouring cup to reach a height of 2 / 3H or higher after 5-10 seconds, with no overflow as the principle, and the liquid level is maintained at a height of H1 after the pouring becomes stable.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1) The present invention is a trough-shaped pouring cup structure, adopts a plug-in slag separator and a refractory step at the water outlet, forming a turning flow channel for molten iron from the slag separator to the water outlet, which is conducive to the floating of iron slag and can realize the automatic slag blocking function. More than 99% of the floating slag is blocked, and the slag blocking effect is excellent;

[0022] 2) By stably controlling the pouring speed, the casting can be filled smoothly, significantly reducing the slag inclusion defects of cast iron parts, and the qualified rate of finished products reaches 100%. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a vertical cross-sectional view of an embodiment of the present invention;

[0024] Figure 2 is a cross-sectional view of an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of a pouring state of an embodiment of the present invention;

[0026] Figure 4 It is a schematic diagram of the pouring system structure in the prior art;

[0027] Figure 5 It is a schematic diagram of the structure of a common conical pouring cup in the prior art;

[0028] Figure 6 It is a schematic diagram of the structure of a common groove-shaped pouring cup in the prior art;

[0029] Figure 7 It is a schematic diagram of ladle pouring in the prior art.

[0030] In the figure: 1-steel tank body, 2-refractory lining, 3-lifting ear, 4-water outlet, 5-slag partition plate, 6-refractory step, 7-upper box, 8-lower box, 9-pouring cup, 10-sprue, 11-riser, 12-casting, 13-cross gate, 14-ingate, 15-floating slag. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0032] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the specific embodiments required to be used in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the present invention. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying creative work.

[0033] The components of the embodiments of the present invention generally described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the invention claimed, but merely represents selected embodiments of the present invention.

[0034] See Figure 1-3 , is a schematic diagram of the structure of an embodiment of a trough-shaped pouring cup capable of automatically blocking slag of the present invention, comprising a steel trough body 1, a refractory lining 2 and a lifting lug 3. A lifting lug 3 is provided at each end of the steel trough body 1. To ensure the overall strength and facilitate handling, the thickness of the steel plate is 1.5-2mm. The lifting lug 3 is convenient for lifting. A refractory lining 2 is provided inside the steel trough body 1. A water outlet 4 is provided at the bottom of the steel trough body 1. A slag separating plate 5 is provided inside the steel trough body 1. The slag separating plate 5 is Al 2 O 3It is made of refractory aggregate and binder with a content of more than 60% to improve the reuse rate. The slag plate 5 is inserted into the slot of the refractory lining 2. According to the amount of molten iron to be poured, the bottom edge of the slag plate 5 is 30-60mm away from the bottom of the refractory lining 2, and generally 40-50mm is selected; one side of the slag plate 5 is the steel inlet area A, and the other side is the steel outlet area B, and the water outlet 4 is located at the bottom of the steel outlet area B; the water outlet 4 is located on the refractory step 6, the upper edge of the refractory step 6 is flush with the lower edge of the slag plate 5, and a 60-80mm spacing m is set between the refractory step 6 and the slag plate 5.

[0035] In the embodiment, the outer dimensions of the steel tank body 1 are 800mm×400mm×350mm in length×width×height, and the length L:width B=2:1. The thickness P of the refractory lining 2 is 60-150mm, and the optimal thickness dimension P is 80-120mm. The thickness a of the slag partition plate 5 is greater than 50mm. In order to improve the efficiency of post-use cleaning and remanufacturing, the refractory lining 2 is preferably a resin sand lining with good disintegrability. The length ratio of the steel inlet area A and the steel outlet area B is 1:1-2, preferably 1:2.

[0036] In order to prevent the slag plate 5 from floating up during casting, casting coating paste or core adhesive is generally used, and the gap between the slag plate 5 and the slot of the refractory lining 2 is preferably filled with casting coating paste. The contact parts of the refractory lining 2 and the slag plate 5 with the liquid metal are coated with a zircon powder alcohol-based coating layer, and the coating layer thickness is preferably 2-3mm to protect the steel tank body 1 and prevent the metal liquid from scouring various parts to cause defects such as sand inclusion.

[0037] The invention discloses a pouring control method for a trough-shaped pouring cup capable of automatically blocking slag. During the pouring process, molten steel is quickly poured into a steel inlet area A, and the metal liquid level in the steel inlet area A of the pouring cup quickly reaches above an observation line X, and the distance between the observation line X and the bottom of a refractory lining 2 H1>3h, and then the pouring speed is reduced to gradually increase the metal liquid in the steel inlet area A, and the pouring speed is maintained at a distance of 50-100mm from the upper edge of the refractory lining 2, and the pouring is stopped immediately when the metal liquid in the riser of the casting mold is about to be filled.

[0038] To obtain the best slag blocking effect, control the rapid pouring, and make the liquid level in the pouring cup reach above 2 / 3H height (without overflowing as the principle) after 5-10 seconds. After the pouring is stable, keep the liquid level H1 height 15 below the floating slag.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A trough-shaped pouring cup capable of automatically blocking slag, comprising a steel trough body, a refractory lining and a lifting lug, wherein a lifting lug is provided at each end of the steel trough body, a refractory lining is provided in the steel trough body, and a water outlet is provided at the bottom of the steel trough body, characterized in that: A slag partition plate is provided in the steel trough body, and the slag partition plate is inserted into the slot of the refractory lining, and the bottom edge of the slag partition plate is 30-60mm away from the bottom of the refractory lining h; one side of the slag partition plate is the steel inlet area, and the other side is the steel outlet area, and the water outlet is located at the bottom of the steel outlet area; the water outlet is located on the refractory step, and the upper edge of the refractory step is flush with the lower edge of the slag partition plate, and a spacing m of 60-80mm is provided between the refractory step and the slag partition plate, and from the steel inlet area to the steel outlet area, the molten steel bypasses the bottom of the slag partition plate and the edge of the refractory step to form an S-shaped flow channel.

2. A trough-shaped pouring cup capable of automatically blocking slag according to claim 1, characterized in that: The outer dimensions of the steel trough body are (length × width × height) (500-800) mm × (300-500) mm × (300-500) mm, and the length:width = 2:

1.

3. A trough-shaped pouring cup capable of automatically blocking slag according to claim 1, characterized in that: The thickness of the refractory lining is 60-150 mm.

4. A trough-shaped pouring cup capable of automatically blocking slag according to claim 1, characterized in that: The refractory lining is a resin sand lining.

5. The trough-shaped pouring cup capable of automatically blocking slag according to claim 1, characterized in that: The length ratio of the steel entry zone to the steel exit zone is 1:1-2.

6. The trough-shaped pouring cup capable of automatically blocking slag according to claim 1, characterized in that: The slag separator is made of refractory aggregate with Al2O3 content exceeding 60% and a binder.

7. The trough-shaped pouring cup capable of automatically blocking slag according to claim 1, characterized in that: The gap between the slag screen and the slot of the refractory lining is filled with casting paint paste.

8. The trough-shaped pouring cup capable of automatically blocking slag according to claim 1, characterized in that: The contact parts of the refractory lining and the slag separator with the liquid metal are coated with a zircon powder alcohol-based coating layer, and the coating layer thickness is 1-3 mm.

9. A pouring control method for a trough-shaped pouring cup capable of automatically blocking slag, characterized in that: During the pouring process, the molten steel is quickly poured into the steel inlet area. The metal liquid level in the steel inlet area of ​​the pouring cup quickly reaches above the observation line. The observation line is H1>3h away from the bottom of the refractory lining. Then the pouring speed is reduced to allow the metal liquid in the steel inlet area to gradually rise. When it is 50-100mm away from the upper edge of the refractory lining, the pouring speed is maintained. When the metal liquid in the riser of the mold is about to be filled, the pouring is stopped immediately.

10. The pouring control method of a trough-shaped pouring cup capable of automatically blocking slag according to claim 9, characterized in that: The rapid pouring makes the liquid level in the pouring cup reach a height of 2 / 3H or more after 5-10 seconds, with no overflow as the principle, and maintains the liquid level at H1 after the pouring stabilizes.

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