Pouring auxiliary device of gravity casting mold

Abstract

The pouring auxiliary device of the gravity casting mold comprises a sand cup and a pressing cup, the pressing cup is of a hollow tubular structure with the upper end and the lower end opened, an inner cavity of the pressing cup comprises an upper section, a middle section and a lower section from top to bottom, and the inner diameter of the lower section and the inner diameter of the middle section are gradually reduced from bottom to top. The upper section is gradually enlarged from bottom to top; a runner is formed in the sand cup; the outer diameter of the sand cup is gradually increased from top to bottom; and the top end of the sand cup is matched with the lower section of the pressing cup through a step surface, so that the runner is communicated with the hollow interior of the pressing cup. Under the condition that an original sand cup gap is not changed, the sand cup is effectively prevented from floating upwards, production interruption and production hidden dangers caused by floating upwards are avoided, and the automatic line casting function can be achieved in an auxiliary mode.

Description

Technical Field

[0001] The utility model relates to the technical field of casting, in particular to a pouring auxiliary device for a gravity casting mold. Background Art

[0002] In the production of aluminum alloy gravity casting, the molten aluminum alloy enters the mold through the gate system. In order to achieve the shrinkage compensation effect, a gate sleeve (sand gate cup, referred to as sand cup) made of coated sand with large specific heat capacity is usually used to insulate the gate system.

[0003] However, due to the manufacturing process, the sand-made pouring cup is often limited in height and the size of the pouring gate when the outer diameter of the cup body is often limited, which makes it difficult for personnel to operate the pouring directly, especially when the automatic line is used for casting. The difficulty of operation is much higher, which often causes the aluminum liquid in the ladle to pour crookedly and pour to the outside of the mold pouring gate. The aluminum liquid that overflows to the outside of the mold pouring gate needs to be cleaned up in time, which will cause additional production interruptions and production risks. In addition, since the sand cup is light in weight, when the aluminum liquid moves upward when pouring into the cavity, the sand cup may float up due to the impact of the aluminum liquid, causing appearance defects. In severe cases, the aluminum liquid will overflow from the gap between the sand cup and the mold after floating, causing additional production interruptions. In response to this, the gap between the bottom of the sand cup and the mold is usually tightened to prevent the sand cup from floating up. However, this also easily causes the sand cup to rub against the mold, causing sand to fall off and resulting in appearance quality problems of the casting. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a pouring auxiliary device for a gravity casting mold, which can effectively prevent the sand cup from floating up without changing the original sand cup gap, and can also assist in realizing the function of automatic line casting.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A pouring auxiliary device for a gravity casting mold, comprising a sand cup and a pressure cup, wherein the pressure cup is a tubular structure with upper and lower ends open and an inner hollow portion, wherein the inner cavity of the pressure cup comprises an upper section, a middle section and a lower section from top to bottom, wherein the inner diameters of the lower section and the middle section are gradually reduced from bottom to top, and the inner diameters of the upper section are gradually increased from bottom to top;

[0007] A flow channel is formed in the sand cup;

[0008] The outer diameter of the sand cup gradually increases from top to bottom;

[0009] The top of the sand cup cooperates with the lower section of the pressing cup through a step surface, so that the flow channel is connected with the hollow inside of the pressing cup.

[0010] Further technical solutions are:

[0011] The cross section of the inner cavity of the pressing cup is circular.

[0012] The inner diameter of the flow channel of the sand cup gradually decreases from top to bottom.

[0013] The outer diameter of the top end of the sand cup is smaller than the inner diameter of the top end of the lower section.

[0014] The top of the sand cup is higher than the mold surface.

[0015] The pressing cup is made of iron.

[0016] The pressing cup is provided with a handle.

[0017] The beneficial effects of the utility model are as follows:

[0018] The utility model adds a pressure cup to the sand pouring cup of the original pouring system, and through the cooperation between the sand cup and the pressure cup, the sand pouring cup is prevented from floating up due to its light weight, which effectively reduces the production interruption caused by aluminum overflow from the pouring gate and improves the production efficiency.

[0019] The utility model uses an external pressure cup with segmented internal flow channels to make the gate larger and higher than the mold surface, which is convenient for automatic robot casting alignment, effectively improves the debugging efficiency, and avoids the safety risk of overflowing the gate due to the gate being too small during casting of aluminum liquid in the ladle.

[0020] The utility model has the advantages of simple structure, low manufacturing cost and is suitable for automatic pouring and manual pouring operations.

[0021] Other features and advantages of the present invention will be described in the following description or will be understood by implementing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 for Figure 5 Sectional view of section AA.

[0023] Figure 2 This is a schematic structural diagram of a pressing cup according to an embodiment of the utility model.

[0024] Figure 3 for Figure 1 Enlarged view of part A in the middle.

[0025] Figure 4 It is a structural schematic diagram of an embodiment of the utility model.

[0026] Figure 5 It is a top view of an embodiment of the utility model.

[0027] In the figure: 1. ladle; 2. pressure cup; 21. upper section; 22. middle section; 23. lower section; 3. sand cup; 4. runner; 5. casting product; 6. handle; 7. mold. DETAILED DESCRIPTION

[0028] The specific implementation of the present utility model is described below with reference to the accompanying drawings.

[0029] like Figure 1 , Figure 2 As shown, the pouring auxiliary device of the gravity casting mold of this embodiment includes a sand cup 3 and a pressure cup 2. The pressure cup 2 is a tubular structure with upper and lower ends opened and an inner hollow. The inner cavity of the pressure cup 2 includes an upper section 21, a middle section 22 and a lower section 23 from top to bottom. The inner diameters of the lower section 23 and the middle section 22 are gradually reduced from bottom to top, and the upper section 21 is gradually increased from bottom to top, that is, the upper section 21 is a wide-mouthed shape that gradually expands from bottom to top, and the middle section 22 and the lower section 23 are both narrow-mouthed shapes that gradually shrink from bottom to top.

[0030] A flow channel 4 is formed in the sand cup 3;

[0031] The outer diameter of the sand cup 3 gradually increases from top to bottom;

[0032] like Figure 3 As shown, the top of the sand cup 3 cooperates with the lower section 23 of the pressing cup 2 through a step surface, so that the flow channel 4 is connected to the hollow inside of the pressing cup 2.

[0033] Specifically, the angle between the side wall of the upper section 21 and the vertical direction is 20°, the angle between the side wall of the middle section 21 and the vertical direction is 1° (ie, the draft angle), and the angle between the side wall of the lower section 23 and the vertical direction is 3°.

[0034] Specifically, the cross section of the inner cavity of the pressing cup 2 is circular.

[0035] Specifically, the inner diameter of the flow channel 4 of the sand cup 3 gradually decreases from top to bottom. This structure of large top and small bottom is conducive to the subsequent detachment of the sand cup and its internal shrinkage feeding structure from the casting product 5 when the cooled product is repaired.

[0036] like Figure 3 As shown, the outer diameter of the top end of the sand cup 3 is smaller than the inner diameter of the top end of the lower section 23 .

[0037] Specifically, the top of the sand cup 3 is higher than the surface of the mold 7 .

[0038] Specifically, the pressing cup 2 is made of iron so as to have a certain deadweight so as to be stably pressed on the sand cup.

[0039] Specifically, the pressing cup 2 is provided with a handle 6 .

[0040] The device of this embodiment can be applied to automatic pouring by a robot, and can also be operated manually. During pouring, the aluminum liquid directly contacts the pressing cup, and its temperature will be very high. The addition of a handle is convenient for further stabilizing the pressing cup, and at the same time, it is heat-insulated to prevent burns.

[0041] During installation of this embodiment, the sand cup 3 is first placed into the gate of the mold 7, and then the pressing cup 2 is placed on top of the sand cup 3 to form a complete mold gate system. Since the bottom of the pressing cup 2 matches the upper end of the sand cup 3, the pressing cup 2 can be accurately and stably placed on the sand cup 3, and since the pressing cup 2 is made of iron, it can press the sand cup 3 under its own weight.

[0042] See also Figures 1 to 5 In this embodiment, during casting, the aluminum liquid starts to pour from the ladle 1. Since the upper section 21 of the pressure cup 2 is wide-mouthed, the aluminum liquid can enter the gate system of the mold more safely and effectively. The aluminum liquid continues to pour until the liquid level rises to below the upper end of the middle section 22 of the pressure cup 2. The aluminum liquid solidifies. After the shrinkage compensation is completed, since the middle section 22 of the pressure cup 2 is at a certain draft angle, the pressure cup 2 can be easily separated from the solidified shrinkage compensation riser structure. The narrow mouth of the lower section 23 of the pressure cup 2 is consistent with the inclination angle of the outer wall of the sand cup 3, and the angle between the side wall of the lower section 23 and the vertical direction is slightly larger than the angle between the side wall of the sand cup 3 and the vertical direction, which is convenient for the two to dock stably. After the casting product 5 in the mold is taken out, the sand cup and the pressure cup can be replaced in sequence for repeated operation and use.

[0043] Those skilled in the art can understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pouring auxiliary device for a gravity casting mold, characterized in that: The invention comprises a sand cup (3) and a pressing cup (2), wherein the pressing cup (2) is a tubular structure with upper and lower ends opened and an inner hollow portion, and the inner cavity of the pressing cup (2) comprises an upper section (21), a middle section (22) and a lower section (23) from top to bottom, wherein the inner diameters of the lower section (23) and the middle section (22) gradually decrease from bottom to top, and the inner diameter of the upper section (21) gradually increases from bottom to top; A flow channel (4) is formed in the sand cup (3); The outer diameter of the sand cup (3) gradually increases from top to bottom; The top end of the sand cup (3) cooperates with the lower section (23) of the pressing cup (2) via a stepped surface, so that the flow channel (4) is connected to the hollow interior of the pressing cup (2).

2. The pouring auxiliary device for a gravity casting mold according to claim 1, characterized in that: The cross section of the internal cavity of the pressing cup (2) is circular.

3. The pouring auxiliary device for a gravity casting mold according to claim 1, characterized in that: The inner diameter of the flow channel (4) of the sand cup (3) gradually decreases from top to bottom.

4. The pouring auxiliary device for a gravity casting mold according to claim 1, characterized in that: The outer diameter of the top end of the sand cup (3) is smaller than the inner diameter of the top end of the lower section (23).

5. The pouring auxiliary device for a gravity casting mold according to claim 1, characterized in that: The top end of the sand cup (3) is higher than the surface of the mold (7).

6. The pouring auxiliary device for a gravity casting mold according to claim 1, characterized in that: The pressing cup (2) is made of iron.

7. The pouring auxiliary device for a gravity casting mold according to claim 1, characterized in that: The pressing cup (2) is provided with a handle (6).

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