Cold device for high pressure point of extrusion pin of die casting mold

Abstract

The utility model discloses extrusion pin high pressure point cold device of die casting mould, including extruding oil cylinder for providing extruding power, oil cylinder center column is set up along the axial penetration extruding oil cylinder, and inside is provided with first point cold through hole, oil cylinder connector is fixedly connected in the end of oil cylinder center column, and is equipped with the second point cold through hole with first point cold through hole intercommunication, extrusion pin, the inside is drilled with point cold channel, and this point cold channel is communicated with second point cold through hole, first point cold through hole in proper order, high pressure point cold pipe is in proper order and is set up in first point cold through hole, second point cold through hole, and extends to the point cold channel, is used for cooling extrusion pin. The device realizes the quick cooling of extrusion pin through high pressure point cold technology to eliminate the casting tensile injury defect of extrusion pin side, makes extrusion pin hole can be processed according to the standard machining allowance, ensures that the surface after processing is always in the range of casting dense layer.

Description

Technical Field

[0001] This utility model relates to the field of die casting technology, specifically to a high-pressure cooling device for die casting mold extrusion pins. Background Technology

[0002] Local extrusion technology for die-casting molds has been widely used in the production of die-cast products with high airtightness requirements. This technology involves applying secondary pressure to excessively thick areas during the die-casting process in a semi-solid state, using a mold cylinder to drive an extrusion pin to push it out. This densifies the surrounding crystalline structure, thereby reducing shrinkage defects caused by localized heat concentration during the liquid-to-solid phase transition, and significantly improving the density and airtightness of the product.

[0003] However, in practical applications, because the extrusion pin is in direct contact with molten metal for extended periods, its surface is highly susceptible to casting defects such as scoring due to overheating. These defects can lead to two serious consequences: first, if the inner surface of the hole is machined with the standard allowance, the scoring marks may leave a black residue inside the hole after machining; second, if the machining allowance is increased to avoid scoring, excessive cutting may damage the dense layer on the product surface, exposing dense internal pores, ultimately causing the product to fail to maintain its airtightness and become unusable.

[0004] Currently, traditional extrusion pin structures are limited by space and design constraints, making it difficult to directly integrate cooling water channels for effective temperature control. The continuous high temperature of the extrusion pin not only exacerbates the risk of casting damage but also reduces mold life and production stability. Utility Model Content

[0005] The purpose of this invention is to provide a high-pressure cooling device for die-casting mold extrusion pins, which can rapidly cool the extrusion pins, effectively reduce their working temperature, thereby avoiding casting defects caused by overheating and improving product quality and mold reliability.

[0006] To achieve the above objectives, this application proposes a high-pressure cooling device for die-casting mold extrusion pins, comprising:

[0007] Extrusion cylinders are used to provide extrusion power;

[0008] The hydraulic cylinder center column is installed axially through the extrusion cylinder, and a first point cold passage hole is opened inside it;

[0009] The hydraulic cylinder connector is fixedly connected to the end of the hydraulic cylinder center column and is provided with a second cold passage hole that communicates with the first cold passage hole;

[0010] The extrusion pin has a cooling channel drilled inside, which is connected in sequence to the second cooling through hole and the first cooling through hole.

[0011] High-pressure cooling pipes are sequentially inserted through the first cooling through hole and the second cooling through hole, and extend into the cooling channel to cool the extrusion pin.

[0012] In one embodiment, the high-pressure cooling pipe is provided with an inlet water channel and an outlet water channel that are interconnected to form a circulation path for the cooling medium.

[0013] In one embodiment, the extrusion pin passes through the slider seat and extends into the slider, with its end positioned directly opposite the thick-walled region of the casting.

[0014] In one embodiment, one end of the cylinder center column extends into the slider seat, and the other end extends out of the compression cylinder.

[0015] In one embodiment, a fixing pin sleeve is provided around the outer periphery of the extrusion pin, and the fixing pin sleeve is installed in conjunction with a limiting hole on the slider.

[0016] In one embodiment, the end of the slider seat is provided with a groove for avoiding the fixing pin sleeve.

[0017] In one embodiment, the cylinder connector is located in the assembly cavity of the slider seat, with one end extending into the groove of the cylinder center column and connected by a thread, and the other end engaging with a pressing pin.

[0018] In one embodiment, a detachable core is mounted on the slider, with an extrusion pin extending axially through the core. This modular design allows for quick replacement of the core when it wears or is damaged, significantly reducing maintenance costs and production downtime.

[0019] In one embodiment, the end of the high-pressure cooling pipe is provided with an inlet connector and an outlet connector side by side, and both the inlet connector and the outlet connector are located on the side of the cylinder center column.

[0020] In one embodiment, the compression cylinder is located on one side of the slider seat.

[0021] Compared with the prior art, the above technical solution adopted by this utility model has the following advantages: This device achieves rapid cooling of the extrusion pin through high-pressure spot cooling technology, thereby eliminating casting scratch defects on the side of the extrusion pin; This cooling structure enables the extrusion pin hole to be machined according to the standard machining allowance, ensuring that the machined surface is always within the dense layer of the casting.

[0022] This device not only avoids quality problems such as black skin or exposed pores after processing and significantly improves the airtightness and mechanical properties of castings, but also greatly improves the yield rate and economic benefits. Attached Figure Description

[0023] Figure 1A cross-sectional view of the high-pressure cooling device for the die-casting mold extrusion pin;

[0024] Figure 2 Exploded view of the high-pressure cooling device for the die-casting mold extrusion pin;

[0025] Figure 3 This is a partial schematic diagram of the high-pressure cooling device for the die-casting mold extrusion pin;

[0026] Wherein: 1-casting; 2-slider; 3-core; 4-slider seat; 5-extrusion cylinder; 6-high pressure cooling pipe; 7-cylinder center column; 8-cylinder connector; 9-extrusion pin; 10-fixed pin sleeve. Detailed Implementation

[0027] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0028] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0029] In the description of this application, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "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. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] Please see Figure 1-3This embodiment provides a high-pressure cooling device for the extrusion pin of a die-casting mold, including an extrusion cylinder, a cylinder center column, a cylinder connector, an extrusion pin, and a high-pressure cooling pipe. The extrusion cylinder is fixedly mounted on one side of the slider seat, providing the power source for the entire extrusion action. The cylinder center column extends axially through the entire extrusion cylinder, with one end extending into the slider seat and the other end protruding outside the cylinder. A first cooling through hole is machined on the cylinder center column, serving as a channel for the cooling medium.

[0032] The hydraulic cylinder connector is fixed to the end of the hydraulic cylinder center column via a threaded connection. It has a second cold-pass hole inside that aligns with the first cold-pass hole. The hydraulic cylinder connector is installed entirely within the assembly cavity of the slider seat, using a connection method where one end is inserted into the groove of the hydraulic cylinder center column and the other end is engaged with the clamping pin, ensuring precise positioning and reliable connection between the components.

[0033] The extrusion pin is the core component of this device, with a through-type cooling channel drilled into it. This channel connects sequentially to the second cooling through-hole of the hydraulic cylinder connector and the first cooling through-hole of the hydraulic cylinder center column, forming a complete cooling path. The extrusion pin extends through the slider seat into the interior of the slider, with its working end precisely aligned with the thick-walled area of ​​the casting to ensure the extrusion and feeding effect. A fixing pin sleeve is fitted onto the outside of the extrusion pin, engaging with the limiting hole on the slider to ensure movement accuracy; the end of the slider seat is designed with a clearance groove.

[0034] The high-pressure cooling pipe, as the core component for cooling, passes sequentially through the first and second cooling through holes and extends into the cooling channel of the extrusion pin. This cooling pipe employs a dual-channel design, including interconnected inlet and outlet channels to form a cooling medium circulation path. Parallel inlet and outlet connectors are located on the side of the cylinder's central column to facilitate the connection of external cooling pipes.

[0035] During the die casting process, after the molten metal fills the mold cavity, the extrusion cylinder drives the central column of the cylinder forward, which in turn drives the extrusion pin to extrude and compress the thick-walled areas of the casting. At the same time, high-pressure cooling water enters from the water inlet connector, passes through the water inlet channel located in the quenching channel, and rapidly cools the extrusion pin under high temperature. Then, it is discharged from the water outlet connector through the water outlet channel, forming a circulating cooling system.

[0036] This device, through high-pressure spot cooling technology, successfully solves industry problems such as overheating of traditional extruded pins and casting scratches, providing a reliable solution for improving the quality of die-cast parts. The precise fit and optimized design between components ensure structural stability and reliability, significantly improving product quality and production efficiency.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A high-pressure cooling device for die-casting mold extrusion pins, characterized in that, include: Extrusion cylinders are used to provide extrusion power; The hydraulic cylinder center column is installed axially through the extrusion cylinder, and a first point cold passage hole is opened inside it; The hydraulic cylinder connector is fixedly connected to the end of the hydraulic cylinder center column and is provided with a second cold passage hole that communicates with the first cold passage hole; The extrusion pin has a cooling channel drilled inside, which is connected in sequence to the second cooling through hole and the first cooling through hole. High-pressure cooling pipes are sequentially inserted through the first cooling through hole and the second cooling through hole, and extend into the cooling channel to cool the extrusion pin.

2. The high-pressure cooling device for die-casting mold extrusion pins according to claim 1, characterized in that, The high-pressure cooling pipe is equipped with interconnected inlet and outlet water channels, forming a circulation path for the cooling medium.

3. The high-pressure cooling device for die-casting mold extrusion pins according to claim 1, characterized in that, The extrusion pin passes through the slider seat and extends into the slider, with its end positioned directly opposite the thick-walled area of ​​the casting.

4. The high-pressure cooling device for die-casting mold extrusion pins according to claim 3, characterized in that, One end of the central column of the hydraulic cylinder extends into the slider seat, and the other end extends out of the compression cylinder.

5. The high-pressure cooling device for die-casting mold extrusion pins according to claim 3, characterized in that, The outer periphery of the extrusion pin is fitted with a fixing pin sleeve, which is installed in conjunction with the limiting hole on the slider.

6. The high-pressure cooling device for die-casting mold extrusion pins according to claim 5, characterized in that, The end of the slider seat is provided with a groove for avoiding the fixing pin sleeve.

7. The high-pressure cooling device for die-casting mold extrusion pins according to claim 3, characterized in that, The hydraulic cylinder connector is located in the assembly cavity of the slider seat. One end of the connector extends into the groove of the hydraulic cylinder center column and is connected by a thread, while the other end is engaged with the extrusion pin.

8. The high-pressure cooling device for die-casting mold extrusion pins according to claim 3, characterized in that, The slider is equipped with a detachable core, and the extrusion pin is set through the core axially.

9. The high-pressure cooling device for die-casting mold extrusion pins according to claim 1, characterized in that, The high-pressure cooling pipe has an inlet connector and an outlet connector arranged side by side at its end, and both the inlet connector and the outlet connector are located on the side of the cylinder center column.

10. The high-pressure cooling device for die-casting mold extrusion pins according to claim 3, characterized in that, The extrusion cylinder is located on one side of the slider seat.

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