Deep-cavity hydraulic cylinder vertical line casting device and method

Abstract

The invention discloses a deep-cavity hydraulic cylinder vertical line casting device and method, and belongs to the technical field of cylinder casting. The deep-cavity hydraulic cylinder vertical line casting device comprises a mold, a pouring cup is arranged at the top of the mold, the two sides of the pouring cup communicate with flowing channels correspondingly, the flowing channels communicate with bottom sprues correspondingly, the bottom sprues communicate with workpieces, and the tops of the workpieces communicate with risers; and the top of the riser communicates with an exhaust mechanism. Casting is carried out on a disa production line, a core setting scheme is adopted for parts which cannot be demolded, molding is carried out in a sand mold and sand core combined mode, pouring gate water inlet pouring is adopted, it is guaranteed that the pouring process is stable, and meanwhile the temperature field of parts in the pouring process is balanced.

Description

Technical Field

[0001] This invention belongs to the field of cylinder casting technology, and particularly relates to a deep cavity hydraulic cylinder vertical line casting device and method. Background Technology

[0002] For castings, thick and large parts generally involve feeding issues, and if feeding cannot be achieved, internal shrinkage porosity and shrinkage cavities are very likely to occur. For hydraulic cylinder bodies, the inner hole is a blind hole, and the through hole is perpendicular to the demolding direction, making casting demolding impossible. Conventional sand cores are very prone to core floating. Furthermore, the head area is very thick and is the hydraulic working area, so hydraulic oil leakage cannot be allowed. How to achieve vertical production of such parts is a difficult problem that needs to be solved. Summary of the Invention

[0003] The purpose of this invention is to provide a vertical casting device and method for deep-cavity hydraulic cylinders to solve the problems existing in the prior art.

[0004] To achieve the above objectives, the present invention provides the following solution: The present invention provides a vertical casting device for a deep cavity hydraulic cylinder, including a mold, a pouring cup on the top of the mold, flow channels on both sides of the pouring cup, a bottom gate on each side of the flow channels, a workpiece on the bottom gate, a riser on the top of the workpiece, and an exhaust mechanism on the top of the riser.

[0005] Optionally, the flow channel includes a horizontal runner connected to the pouring cup, the horizontal runner being connected to a main overlap, the bottom of the main overlap being connected to an upper vertical runner, the bottom of the upper vertical runner being connected to a throttling block, the bottom of the throttling block being connected to a lower vertical runner, and the lower vertical runner being connected to the bottom gate.

[0006] Optionally, each of the bottom gates is connected to an overlapping piece, and the overlapping piece is connected to the lower vertical runner.

[0007] Optionally, the lower vertical runner has a side gate connected to the side of the workpiece, and the side gate is connected to the workpiece.

[0008] Optionally, the exhaust mechanism includes an exhaust channel communicating with the riser, and an exhaust ball is connected between the two exhaust channels.

[0009] Optionally, a sand core is provided between the two workpieces, and a support tube is provided inside the sand core.

[0010] Optionally, the sand core is provided with a positioning pin.

[0011] Optionally, the edge of the mold is provided with multiple guide pins.

[0012] A method for vertical line casting of a deep-cavity hydraulic cylinder body includes the following steps:

[0013] S1. Pouring molten iron: Molten iron is poured into the flow channel through a pouring cup;

[0014] S2. Molten iron enters the workpiece through the bottom gate. When 20% of the molten iron has entered, it enters the inner cavity of the workpiece through the side gate.

[0015] S3. Stop pouring molten iron when the inner cavity and riser of the workpiece are filled with molten iron.

[0016] This invention discloses the following technical effects: In the casting process on the DISA production line, for parts that cannot be demolded, a core-setting solution is adopted. Forming is achieved through a combination of sand mold and sand core, with water injection at the gating gate to ensure a stable pouring process and balance the temperature field of the parts during pouring. This invention enables demolding of deep cavities in hydraulic cylinders using DISA molds and meets the requirement of no shrinkage cavities or porosity defects inside. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 This is a schematic diagram of the vertical casting device for the deep cavity hydraulic cylinder body of the present invention;

[0019] Figure 2 This is a cross-sectional view of the workpiece of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the workpiece of the present invention.

[0021] Figure label:

[0022] 1. Pour cup; 2. Horizontal runner; 3. Main lap joint; 4. Upper vertical runner; 5. Riser; 6. Throttling block; 7. Lower vertical runner; 8. Side gate; 9. Workpiece; 10. Lap joint; 11. Bottom gate; 12. Vent ball; 13. Vent channel; 14. Locating pin; 15. Sand core; 16. Support tube; 17. Guide pin. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Reference Figures 1 to 3 As shown, this embodiment provides a deep cavity hydraulic cylinder vertical line casting device, including a mold, a pouring cup 1 on the top of the mold, flow channels on both sides of the pouring cup 1, bottom gate 11 on both sides of the flow channels, workpiece 9 on the bottom gate 11, riser 5 on the top of the workpiece 9, and venting mechanism on the top of the riser 5.

[0026] In the casting process of the Disha production line, a core-setting solution is adopted for parts that cannot be demolded. The parts are formed by combining sand mold and sand core 15, and water is poured into the gate to ensure a stable pouring process and to balance the temperature field of the parts during the pouring process.

[0027] The scheme is further optimized. The flow channel includes a horizontal runner 2 connected to the pouring cup 1. The horizontal runner 2 is connected to a main lap joint 3. The bottom of the main lap joint 3 is connected to an upper vertical runner 4. The bottom of the upper vertical runner 4 is connected to a throttling block 6. The bottom of the throttling block 6 is connected to a lower vertical runner 7. The lower vertical runner 7 is connected to the bottom gate 11.

[0028] The scheme has been further optimized so that the bottom gate 11 is connected to the overlapping piece 10, and the overlapping piece 10 is connected to the lower vertical runner 7.

[0029] The design is further optimized so that the side of the lower vertical runner 7 near the workpiece 9 is connected to the side gate 8, and the side gate 8 is connected to the workpiece 9.

[0030] Molten iron enters the horizontal sprue 2 through the pouring cup 1, and is then slag-avoided by the main lap joint 3, which prevents larger impurities from entering the subsequent pouring system. The dimensions and thickness of this location are crucial. The molten iron is decelerated by the throttling block 6 and enters the vertical sprue. At this point, the molten iron is relatively clean. Initially, the molten iron enters the workpiece 9 cavity through the bottom gate 11 via the lap joint 10. Due to its structure, the bottom gate 11 splits the molten iron into two streams that enter the inner cavity of the workpiece 9. When 20% of the molten iron has entered, it simultaneously enters the inner cavity of the workpiece 9 through the side gate 8, achieving multi-gate water intake until the inner cavity of the workpiece 9 and the riser 5 are completely filled.

[0031] The exhaust mechanism is further optimized by including an exhaust channel 13 connected to the riser 5, and an exhaust ball 12 connecting the two exhaust channels 13.

[0032] During the entire filling process, the molten iron, along with the gas discharged from the cavity, enters the venting ball 12 through the venting channel 13, which acts as a venting buffer and achieves a hidden venting effect through the molding sand.

[0033] The scheme is further optimized by setting a sand core 15 between the two workpieces 9, and a support tube 16 is set inside the sand core 15.

[0034] The design has been further optimized, with a positioning pin 14 installed inside the sand core 15.

[0035] The design was further optimized by adding multiple guide pins 17 to the edge of the mold.

[0036] The sand core 15 is in direct contact with the workpiece 9, participating in the direct forming of the workpiece 9. The sand core 15 contains a support tube 16, which forms the skeleton of the sand core 15, increasing its rigidity and preventing core drift during casting and molten iron buoyancy operations. The locating pin 14 participates in the positioning during the core placement process, ensuring the accurate placement of the sand core 15 and guaranteeing the dimensional accuracy of the inner cavity of the workpiece 9. The support tube 16 adopts a tubular structure, making better use of the hollow structure of steel pipes, which exhibits better performance in resisting bending and torque, and is used to withstand the buoyancy and thermal effects of molten iron. Furthermore, since the support tube 16 does not directly contact the workpiece 9, it can be reused.

[0037] This invention uses a vertical sand production line, with a lower core in the middle hole to prevent core drift. A middle support tube 16 is used to increase the rigidity of the sand core 15. At the same time, a multi-gate casting method is adopted, with a top riser 5.

[0038] A method for vertical line casting of a deep-cavity hydraulic cylinder body includes the following steps:

[0039] S1. Pouring molten iron: Molten iron is poured into the flow channel through pouring cup 1;

[0040] S2. Molten iron enters workpiece 9 through bottom gate 11. When 20% of the molten iron has entered, it enters the inner cavity of workpiece 9 through side gate 8.

[0041] S3. Continue pouring molten iron until the inner cavity of workpiece 9 and riser 5 are filled with molten iron.

[0042] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0043] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A vertical casting device for a deep-cavity hydraulic cylinder body, characterized in that: The mold includes a pouring cup (1) on the top of the mold, and flow channels are connected to both sides of the pouring cup (1). The flow channels are connected to a bottom gate (11). The bottom gate (11) is connected to a workpiece (9). The top of the workpiece (9) is connected to a riser (5). The top of the riser (5) is connected to an exhaust mechanism.

2. The vertical casting device for deep-cavity hydraulic cylinders according to claim 1, characterized in that: The flow channel includes a horizontal runner (2) connected to the pouring cup (1), the horizontal runner (2) is connected to a main lap joint (3), the bottom of the main lap joint (3) is connected to an upper vertical runner (4), the bottom of the upper vertical runner (4) is connected to a throttling block (6), the bottom of the throttling block (6) is connected to a lower vertical runner (7), and the lower vertical runner (7) is connected to the bottom gate (11).

3. The vertical casting device for deep cavity hydraulic cylinders according to claim 2, characterized in that: The bottom gate (11) is connected to an overlapping piece (10), and the overlapping piece (10) is connected to the lower vertical gating (7).

4. The vertical casting device for deep-cavity hydraulic cylinders according to claim 2, characterized in that: The lower vertical runner (7) is connected to a side gate (8) on the side near the workpiece (9), and the side gate (8) is connected to the workpiece (9).

5. The vertical casting device for deep-cavity hydraulic cylinders according to claim 1, characterized in that: The exhaust mechanism includes an exhaust channel (13) communicating with the riser (5), and an exhaust ball (12) communicating between the two exhaust channels (13).

6. The vertical casting device for deep-cavity hydraulic cylinders according to claim 1, characterized in that: A sand core (15) is provided between the two workpieces (9), and a support tube (16) is provided inside the sand core (15).

7. The vertical casting device for a deep-cavity hydraulic cylinder body according to claim 6, characterized in that: The sand core (15) is provided with a positioning pin (14).

8. The vertical casting device for deep-cavity hydraulic cylinders according to claim 1, characterized in that: The edge of the mold is provided with multiple guide pins (17).

9. A method for vertically casting a deep-cavity hydraulic cylinder body, based on the vertically casting apparatus for a deep-cavity hydraulic cylinder body according to any one of claims 1-8, characterized in that, Includes the following steps: S1. Pouring molten iron: molten iron is poured into the flow channel through the pouring cup (1); S2. Molten iron enters the workpiece (9) through the bottom gate (11). When 20% of the molten iron has entered, it enters the inner cavity of the workpiece (9) through the side gate (8). S3. Stop pouring molten iron when the inner cavity of the workpiece (9) and the riser (5) are filled with molten iron.

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